研究者紹介システム

西田 勇
ニシダ イサム
大学院工学研究科 機械工学専攻
准教授
機械工学関係
Last Updated :2022/06/23

研究者情報

所属

  • 【主配置】

    大学院工学研究科 機械工学専攻
  • 【配置】

    工学部 機械工学科, 未来医工学研究開発センター

学位

  • 博士(工学), 神戸大学
  • 機械加工のレベル5自動運転で実現する自律生産システム

授業科目

ジャンル

  • 科学・技術 / 工学
  • スポーツ・趣味 / スポーツ科学

コメントテーマ

  • 知能化工作機械
  • 筋疲労モデル
  • 下肢筋力の推定手法
  • クラウチングスタート

研究活動

研究分野

  • ものづくり技術(機械・電気電子・化学工学) / 加工学、生産工学

受賞

  • 2020年07月 ASME International Symposium on Flexible Automation 2020, ASME International Symposium on Flexible Automation 2020 Young Investigator Award in Flexible Automation

    西田 勇

  • 2020年03月 一般社団法人日本機械学会, 一般社団法人日本機械学会生産システム部門学術業績賞

    西田 勇

  • 2020年03月 公益社団法人精密工学会, 公益社団法人精密工学会研究奨励賞

    西田 勇

  • 2019年06月 一般社団法人型技術協会, 一般社団法人型技術協会奨励賞, NCプログラムの自動生成と加工時間予測で実現する製品形状に応じた工作機械の割当て

    西田 勇

    日本国

    国内学会・会議・シンポジウム等の賞

  • 2019年05月 公益財団法人マザック財団, 公益財団法人マザック財団優秀論文賞, Automatic Determination of Cutting Conditions for NC Program Generation by Reusing Machining Case Data based on Geometric Properties of Removal Volume

    西田 勇

    日本国

    その他の賞

  • 2019年04月 日本機械学会, 日本機械学会賞(論文), 切削加工のボクセルシミュレータを用いた工作機械の動的挙動と切削力の時間領域連成シミュレーション

    野口 晋, 西田 勇, 佐藤 隆太, 白瀬 敬一

    日本国

    学会誌・学術雑誌による顕彰

  • 2018年05月 公益財団法人マザック財団, 公益財団法人マザック財団優秀論文賞, ボクセルモデルを用いた切削シミュレーションにおける微小時間および微小空間解析の高速処理手法

    西田 勇

    日本国

    その他の賞

  • 2016年09月 日本機械学会 RC272, 日本機械学会RC272産学連携による若手育成プログラムCIA4YI2016 最優秀賞, 産学連携による若手育成プログラムCIA4YI2016

    西田 勇

    その他の賞

  • 2012年06月 日本人間工学会, 2011年度日本人間工学会研究奨励賞, 拮抗筋および二関節筋を考慮した下肢筋力の推定手法 -垂直跳びにおける下肢筋力の推定-

    西田 勇

    日本国

    学会誌・学術雑誌による顕彰

  • 2010年03月 日本機械学会, 2009年度日本機械学会三浦賞, 二関節筋を考慮した筋骨格モデルを用いた人体の運動解析に関する研究

    西田 勇

    日本国

    その他の賞

論文

  • 西田 勇, 堀本 凌輔, 佐藤 隆太, 白瀬 敬一

    Japan Society of Mechanical Engineers, 2020年07月, Transactions of the JSME (in Japanese), 86 (887), 20 - 00153

    [査読有り]

    研究論文(学術雑誌)

  • 1. Machining time reduction by tool path modification to eliminate air cutting motion for end milling operation

    Isamu Nishida, Keiichi Shirase

    2020年06月, International Journal of Automation Technology, 14 (3), 459 - 466, 英語

    [査読有り]

    研究論文(学術雑誌)

  • Ryuta Sato, Shin Noguchi, Taisuke Hokazono, Isamu Nishida, Keiichi Shirase

    © 2019 Elsevier Inc. A higher machining ability is always required for NC machine tools to achieve higher productivity. The self-oscillated vibration called “chatter” is a well-known and significant problem that increases the metal removal rate. The generation process of the chatter vibration can be described as a relationship between cutting force and machine tool dynamics. The characteristics of machine tool feed drives are influenced by the nonlinear friction characteristics of the linear guides. Hence, the nonlinear friction characteristics are expected to affect the machining ability of machines. The influence of the contact between the cutting edge and the workpiece (i.e., process damping) on to the machining ability has also been investigated. This study tries to clarify the influence of the nonlinear friction characteristics of linear guides and ball screws and process damping onto milling operations. A vertical-type machining center is modeled by a multi-body dynamics model with nonlinear friction models. The influence of process damping onto the machine tool dynamics is modeled as stiffness and damping between the tool and the workpiece based on the evaluated frequency response during the milling operation. A time domain-coupled simulation approach between the machine tool behavior and the cutting forces is performed by using the machine tool dynamics model. The simulation results confirm that the nonlinear frictions influence the cutting forces with an effect to suppress the chatter vibration. Furthermore, the influence of process damping can be evaluated by the proposed measurement method and estimated by a time domain simulation.

    2020年01月, Precision Engineering, 61, 103 - 109

    [査読有り]

    研究論文(学術雑誌)

  • Proposal of contour line model for high-speed end milling simulation

    Isamu Nishida, Keiichi Shirase

    2020年01月, International Journal of Automation Technology, 14 (1), 英語

    [査読有り]

    研究論文(学術雑誌)

  • Hayato MIURA, Isamu NISHIDA, Keiichi SHIRASE

    Japan Society of Mechanical Engineers, 2020年, Mechanical Engineering Journal, 7 (3), 20 - 00023, 英語

    [査読有り]

    研究論文(学術雑誌)

  • Taisuke HOKAZONO, Ryuta SATO, Isamu NISHIDA, Keiichi SHIRASE

    Japan Society of Mechanical Engineers, 2020年, Transactions of the JSME (in Japanese), 86 (892), 20 - 00185

    研究論文(学術雑誌)

  • Machine tool assignment realized by automated NC program generation and machining time prediction

    NISHIDA Isamu, Shirase Keiichi

    2019年09月, International Journal of Automation Technology, 13 (5), 700 - 707, 英語

    [査読有り]

    研究論文(学術雑誌)

  • Automated process planning system for end-milling operation considering geometric dimensioning and tolerancing (GD&T)

    Isamu Nishida, Shogo Adachi, Keiichi Shirase

    2019年08月, International Journal of Automation Technology, 13 (6), 825 - 833, 英語

    [査読有り]

    研究論文(学術雑誌)

  • DAIJU YUKI, NISHIDA ISAMU, SHIRASE KEIICHI

    2019年06月, Mechanical Engineering Journal, 6 (4), 英語

    [査読有り]

    研究論文(学術雑誌)

  • NISHIDA ISAMU, MURASE MOTOAKI, SHIRASE KEIICHI

    2019年02月, Journal of Advanced Mechanical Design, Systems, and Manufacturing, 13 (1), 英語

    [査読有り]

    研究論文(学術雑誌)

  • 工具系の弾性変形に起因する加工誤差の予測結果に基づく加工誤差補正

    西田 勇, 白瀬 敬一

    2019年01月, 精密工学会誌, 85 (1), 91 - 97, 日本語

    [査読有り]

    研究論文(学術雑誌)

  • MIURA HAYATO, NISHIDA ISAMU, SHIRASE KEIICHI

    2019年01月, Mechanical Engineering Journal, 6 (1), 英語

    [査読有り]

    研究論文(学術雑誌)

  • Motoaki Murase, Isamu Nishida, Ryuta Sato, Keiichi Shirase

    © 2019 ASME. On-machine measurement (OMM) is introducing to Numerical Control (NC) machine tools. By the OMM, a workpiece is measured on the machine tool (i.e., without loading and unloading), so OMM can reduce the setup time and positioning error for reloading a workpiece. OMM is used for the process control during machining because it is still difficult to suppress the machining error caused by the cutting process such as the tool deflection, the tool wear and the heat deformation during machining. There are several approaches to on-machine measurement, including non-contact measurements using a laser displacement sensor or imaging equipment and contact measurements using a touch probe. However, to conduct OMM with a touch probe it is necessary to generate an NC program by operators. Moreover, for the process control and monitoring, the information of machining process should be considered in the measuring plan. For process control, measurement of a region that affects machining in the next process should be conducted during the machining process (i.e., after the machining of that region). Furthermore, when some machining abnormality that affects product quality occurs during the machining process, the abnormality should be detected and measured at an early stage to avoid unnecessary machining. This study aims to realize the automation of planning for onmachine measurement, where measurement is conducted at the necessary time during the machining process based on process planning for the early detection of machining abnormality. Furthermore, when a machining abnormality is detected based on the measurement results, the proposed system automatically judges whether to stop machining or to re-machine the affected region.

    2019年, ASME 2019 14th International Manufacturing Science and Engineering Conference, MSEC 2019, 2

    [査読有り]

    研究論文(国際会議プロシーディングス)

  • 西田 勇, 村瀬 元章, 佐藤 隆太, 白瀬 敬一

    According to the change of manufacturing style from mass production to customized production, it is important to manage the process plan and to control the machining quality of products. On machine measurement (OMM) has an advantage that it eliminates the operations of remove and reattachment of the workpiece and eliminates the positioning error at the reattachment. The contact measurement using a touch probe is one of the OMM. However, this measurement requires decision of measuring points and paths in order to conduct the measurement using touch probe. Currently, measuring paths of the touch probe is generated by an operator who can recognize the shape of the workpiece, determine the measuring regions and the measuring points. The objective of this study is automatically generation of the NC program to instruct OMM using a touch probe. This study realizes automatically generation of the NC program to instruct OMM by focusing on recognition of the geometrical property of the product shape based on the removal volume and determination of the measuring points and paths.

    一般社団法人 システム制御情報学会, 2019年, システム制御情報学会論文誌, 32 (5), 212 - 217, 日本語

    [査読有り]

  • 笠谷 和樹, 西田 勇, 佐藤 隆太, 白瀬 敬一

    スクエアエンドミル加工の実験から,工具刃先に作用する切削エネルギの累積値と工具逃げ面の摩耗量との間に線形関係があることが明らかとなった。この関係を利用して,切削シミュレーションを行って切削エネルギの累積値を計算することで,加工中の切削状態の変化に依らず工具摩耗量の予測が可能であることを示す。また,実加工において測定した摩耗量の変化と予測した摩耗量の変化とを比較することで本手法の有効性を確認した。

    公益社団法人 精密工学会, 2019年, 精密工学会学術講演会講演論文集, 2019 (0), 191 - 192, 日本語

    [査読有り]

  • 山本 拓也, 西田 勇, 佐藤 隆太, 白瀬 敬一

    グラインダ作業は熟練作業者の経験や勘に頼る加工工程で,加工条件と加工形状の関係が不明で自動化が難しい作業である.本研究では産業用ロボットによるグラインダ作業の自動化を目的として,グラインダの送り速度,押し付け力といった作業動作から加工形状を予測するシミュレータを開発した.シミュレータはPrestonの法則を用いて局所的な除去体積を計算しており,加工形状の予測結果が測定結果と一致することを確認した.

    公益社団法人 精密工学会, 2019年, 精密工学会学術講演会講演論文集, 2019 (0), 719 - 720, 日本語

    [査読有り]

  • Kazuki Kaneko, Isamu Nishida, Ryuta Sato, Keiichi Shirase

    © 2019 The Japan Society of Mechanical Engineers To improve machining efficiency, it is necessary to know the machining status and optimize cutting conditions. Cutting force prediction is one method of determining the machining status. The instantaneous rigid force model is widely used and can be easily applied to cutting force prediction. However, this model requires six parameters called cutting coefficients, which have to be determined in advance through a preliminary experimental cutting test. Therefore, in this study, a new cutting force prediction method that does not require a cutting test is proposed to enable the practical understanding of the milling process in a factory setting. For this purpose, the conventional instantaneous rigid force model was revised based on the oblique cutting model and the orthogonal cutting theory to reduce the number of cutting parameters required for cutting force prediction. In the proposed model, only the shear angle is required for cutting force prediction. In practical situations, the shear angle can be identified immediately from the measured spindle motor torque, which can be monitored without any additional sensors at the start of milling operation, and the milling forces can then be predicted. In the proposed force model, the effect of tool runout can be expressed by considering the rotational radius deviation at each cutting edge. In addition, tool chipping can be detected by comparing the monitored and predicted torques. To validate the effectiveness of the proposed model, cutting experiments were conducted. The predicted force showed good agreement with the measured one. The similarity between the monitored and predicted torques was decreased by tool chipping. These results indicate that the in-process machining status can be understood and tool chipping can be detected practically without any experimental milling to determine the required parameters for prediction or any additional force sensors.

    2019年, Journal of Advanced Mechanical Design, Systems and Manufacturing, 13 (3), 英語

    [査読有り]

    研究論文(学術雑誌)

  • Ryuta Sato, Kiichi Morishita, Isamu Nishida, Keiichi Shirase, Masanobu Hasegawa, Akira Saito, Takayuki Iwasaki

    © 2019, Fuji Technology Press. All rights reserved. As the motion accuracy of 5-axis machining centers directly influences the geometrical shape accuracy of the machined workpieces, accuracy enhancement of the 5-axis machining centers is strongly needed. To improve the shape accuracy during the machining by a 5-axis machine tool, a method that modifies the CL-data based on the motion trajectory errors normal to the machined surface at each command point has been proposed. In this study, the proposed method is applied to simultaneous 5-axis controlled machining to improve motion accuracy. A normal vector calculation method for the simultaneous 5-axis controlledmotion is newly proposed, and the compensation method is applied to turbine blade machining by 5-axis controlled motion. Measurement tests of the cutting motion for blade shape machining by a ball-end mill were carried out with a different control mode of NC. The CL-data for the machining tool path was also modified based on the calculated trajectory of the tool center point. Experimental results reveal that the feed speed and machining accuracy significantly depend on the control mode of NC, and that the shape accuracy can be improved by applying the proposed compensation method without any decrease in motion speed.

    2019年, International Journal of Automation Technology, 13 (5), 583 - 592

    [査読有り]

    研究論文(学術雑誌)

  • Customized End Milling Operation of Dental Artificial Crown without CAM Operation

    NISHIDA ISAMU, TSUYAMA RYO, SATO RYUTA, SHIRASE KEIICHI

    2018年12月, International Journal of Automation Technology, 12 (6), 英語

    [査読有り]

    研究論文(学術雑誌)

  • 西田 勇, 白瀬 敬一

    2018年10月, 日本機械学会論文集, 84 (866), 日本語

    [査読有り]

    研究論文(学術雑誌)

  • NISHIDA ISAMU, SHIRASE KEIICHI

    2018年07月, Journal of Advanced Mechanical Design, Systems, and Manufacturing, 12 (4), 英語

    [査読有り]

    研究論文(学術雑誌)

  • 工具系の弾性変形を考慮したボクセルモデルによるエンドミル加工シミュレーション

    西田 勇, 奥村 龍馬, 佐藤 隆太, 白瀬 敬一

    2018年02月, 精密工学会誌, 84 (6), 572 - 577, 日本語

    [査読有り]

    研究論文(学術雑誌)

  • ボクセルモデルを用いた切削シミュレーションにおける微小時間および微小空間解析の高速処理手法

    西田 勇, 佐藤 隆太, 白瀬 敬一

    2018年02月, 精密工学会誌, 84 (2), 日本語

    [査読有り]

    研究論文(学術雑誌)

  • Isamu Nishida, Ryuma Okumura, Ryuta Sato, Keiichi Shirase

    © 2018 Japan Society for Precision Engineering. All rights reserved. In order to improve machining efficiency, it is required to recognize machining status and optimize cutting conditions. This study develops a newly cutting simulator for end-milling operation, which considers the elastic deflection of tool system. This simulator is based on an instantaneous rigid force model. The uncut chip thickness, which is required to estimate cutting force, is calculated under the consideration of the elastic deflection of the tool system, which corresponds to tool and tool holder deflections caused by cutting force. The newly developed end-milling simulator represents work material by voxel model and calculates the uncut chip thickness from the removed voxels, which are penetrated by tool cutting edges. In our previous study, the uncut chip thickness is calculated from voxels removed by each minute tool rotational angle, and the instantaneous cutting force in a minute time interval can be estimated. Therefore, this study proposes a method to consider the elastic deflection of the tool system caused by the estimated instantaneous cutting force. This study considers the elastic deflection of the tool system, which consists of the tool deflection, the displacement between the tool and the tool holder parallel to the tool axis, the displacement between the tool holder and the spindle parallel to the spindle axis, and the rotational displacement at the tool holding part. The actual uncut chip thickness affected by the elastic deflection of the tool system has to be calculated to estimate the actual cutting force for each minute time. In order to validate the effectiveness of the proposed algorithm, the experimental 3-axis milling operations were conducted. It was confirmed that the predicted cross-sectional shape of the machined surface had good agreement with the measured one.

    2018年, Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering, 84 (6), 572 - 577

    [査読有り]

    研究論文(学術雑誌)

  • Kiichi Morishita, Ryuta Sato, Keiichi Shirase, Isamu Nishida

    © Copyright 2018 ASME. Motion accuracy of NC machine tools is directory copied onto the machined shape. However, it is known that the motion accuracy is deteriorated by several error courses; geometric and dynamic motion errors of feed axes. In this study, in order to enhance the motion accuracy of NC machine tools, a method that modifies the NC program based on the normal direction error at each command point on the designed path is developed. In the method, the error vector between the commanded and estimated machined shape is obtained. The NC program for the motion is modified by adding the obtained error vector with the opposite sign. In order to confirm the effectiveness of the proposed method, 5-axis motion tests for cone-frustum cutting which is widely applied to the accuracy evaluation of 5-axis machining centers are carried out. At the first, it is confirmed that the proposed method can compensate the dynamic synchronous errors based on the feedback positions and angles of the axes. In addition, it is also confirmed that the proposed method can compensate both of dynamic and geometric errors based on the tool center point trajectory measured by a ball-bar system. As the results, it is clarified that the proposed method can effectively enhance the motion accuracy of the 5-axis machining center.

    2018年, ASME 2018 13th International Manufacturing Science and Engineering Conference, MSEC 2018, 4

    [査読有り]

    研究論文(国際会議プロシーディングス)

  • Isamu Nishida, Takaya Nakamura, Ryuta Sato, Keiichi Shirase

    © Copyright 2018 ASME. A new method, which accurately predicts cutting force in ball end milling considering cutting edge around center web, has been proposed. The new method accurately calculates the uncut chip thickness, which is required to estimate the cutting force by the instantaneous rigid force model. In the instantaneous rigid force model, the uncut chip thickness is generally calculated on the cutting edge in each minute disk element piled up along the tool axis. However, the orientation of tool cutting edge of ball end mill is different from that of square end mill. Therefore, for the ball end mill, the uncut chip thickness cannot be calculated accurately in the minute disk element, especially around the center web. Then, this study proposes a method to calculate the uncut chip thickness along the vector connecting the center of the ball and the cutting edge. The proposed method can reduce the estimation error of the uncut chip thickness especially around the center web compared with the previous method. Our study also realizes to calculate the uncut chip thickness discretely by using voxel model and detecting the removal voxels in each minute tool rotation angle, in which the relative relationship between a cutting edge and a workpiece, which changes dynamically during tool rotation. A cutting experiment with the ball end mill was conducted in order to validate the proposed method. The results showed that the error between the measured and predicted cutting forces can be reduced by the proposed method compared with the previous method.

    2018年, ASME 2018 13th International Manufacturing Science and Engineering Conference, MSEC 2018, 4

    [査読有り]

    研究論文(国際会議プロシーディングス)

  • Kazuki Kaneko, Isamu Nishida, Ryuta Sato, Keiichi Shirase

    © 2018 The Authors. Published by Elsevier Ltd. In this study, a virtual milling force monitoring method is proposed for industrial milling process monitoring. For this purpose, a modified instantaneous rigid force model is proposed. Oblique and orthogonal cutting theories are applied in the model to reduce the number of cutting parameters required for milling force prediction. Only the shear angle must be determined in advance for cutting force prediction. In practice, the shear angle can be determined immediately at the start of a milling operation. Based on the shear angle, the milling forces are predicted and can be used instead of the measured milling forces. In addition, in the proposed force model, runout is taken as the difference in the uncut chip thickness between cutting edges. In order to confirm the effectiveness of the proposed force model, a milling experiment was conducted. The predicted milling forces were found to be in agreement with the measured values. These results demonstrate that milling process monitoring can be achieved without conducting experimental milling to determine the required parameters for prediction or installing additional force sensors.

    2018年, Procedia CIRP, 77, 22 - 25

    [査読有り]

    研究論文(国際会議プロシーディングス)

  • Isamu Nishida, Ryuma Okumura, Ryuta Sato, Keiichi Shirase

    © 2018 The Authors. Published by Elsevier Ltd. In this study, a novel end milling operation cutting simulator that considers the static tool deflection was developed. This simulator is based on an instantaneous rigid force model. In this model, the uncut chip thickness, which is necessary to estimate the cutting force, is calculated based on the static tool deflection, which consists of the deflections of the tool and tool holder caused by the cutting force. The newly developed end milling simulator represents the workpiece using a voxel model and calculates the uncut chip thickness from the removed voxels, which are those penetrated by the tool cutting edges. First, a previously developed method of calculating the uncut chip thickness from the voxels removed at minute tool rotation angle intervals was improved. Through the implementation of this improvement, cutting simulation with a high temporal resolution can be realized. With the proposed method, the cutting force is calculated from the uncut chip thickness at minute time intervals, and the static tool deflection is calculated from the cutting force. The uncut chip thickness is influenced by the static tool deflection. Therefore, the cutting force is calculated by considering the change in the uncut chip thickness due to the static tool deflection at minute time intervals. To confirm the effectiveness of the newly improved cutting simulator, a cutting experiment was conducted. The finished surface profiles estimated using the proposed method showed good agreement with the measured profiles.

    2018年, Procedia CIRP, 77, 574 - 577

    [査読有り]

    研究論文(国際会議プロシーディングス)

  • Automatic process planning system for end-milling operation reflecting cam operator’s intention

    Isamu Nishida, Taishi Hirai, Ryuta Sato, Keiichi Shirase

    Copyright © 2018 by ISFA. An automatic process planning system for end-milling operation is proposed, in which CAM operator's intention for process planning is considered. In the previous process planning systems, the machining sequence is calculated geometrically. However, it remains difficult to determine the best machining sequence from the large number candidates of the calculated machining sequences. The previous process planning systems also do not consider CAM operator's intention in the determination of the appropriate machining sequence. First, our new process planning system stores the priority of machining features to be machined and the geometrical properties of the selected machining region from operations of CAM operators to decide the machining sequence. After storing the priority of machining feature and the geometrical properties, the appropriate machining sequence can be automatically determined by reflecting these information. CAM operator's intention, which is involved implicitly in the stored geometrical properties of the machining region, can be applied to decide the appropriate machining sequence.

    2018年, Proceedings of 2018 ISFA - 2018 International Symposium on Flexible Automation

    [査読有り]

    研究論文(国際会議プロシーディングス)

  • Automation of on-machine measurement based on 3D CAD model of product

    Motoaki Murase, Isamu Nishida, Ryuta Sato, Keiichi Shirase

    Copyright © 2018 by ISFA. On-machine-Measurement (OMM) is the measuring on the machine tool and getting the result of machining instead of measuring on a measuring instrument. OMM doesn’t require the desperation and repositioning process, so the shortening the lead time for inspections is achieved. For execution of OMM the operator should set measurement strategy, such as measurement item, the number of measuring points and the position, to generate a NC program for the measurement. In this study, our aim is the automation of those preparation tasks required time and effort, especially touch trigger probe which is introduced for NC machine tools is utilized. Our proposed system automatically recognize the machining feature from the Total Removal Volume (TRV) detected between the CAD models of product and material, and decide the measuring strategy. Therefore, the NC program for executing OMM with touch trigger probe is automatically generated. A case study was conducted to show the effectiveness of the developed OMM system.

    2018年, Proceedings of 2018 ISFA - 2018 International Symposium on Flexible Automation

    [査読有り]

    研究論文(国際会議プロシーディングス)

  • Isamu Nishida, Ryuta Sato, Keiichi Shirase

    © 2018 Japan Society for Precision Engineering. All rights reserved. In order to improve machining efficiency, it is required to recognize machining status and optimize cutting conditions. Cutting force is meaningful information to recognize machining status. In the instantaneous rigid force model, which is the most popular model for milling force prediction, milling force is calculated based on the geometrical intersection between cutting edge and workpiecc for each feed per tooth. In this model, both of static tool deflection and tool dynamic vibration arc not considered. In order to overcome this problem, a new high speed computational algorithm in our voxel based milling process simulation is proposed. The proposed algorithm permits to consider both of static tool deflection and tool dynamic vibration in our voxel based milling process simulation. In the proposed algorithm, the intersection between cutting edge and workpiece is calculated in each minute time interval or minute tool rotational angle interval. Furthermore, the proposed algorithm permits to shorten the computational time of detecting removal voxels to calculate uncut chip thickness discretely. Therefore, high precision analysis can be performed in minute space resolution. The effectiveness of the proposed algorithm is validated by experimental 3-axis milling tests. Predicted milling forces under several cutting conditions have good agreement with the measured milling forces.

    2018年, Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering, 84 (2), 175 - 181

    [査読有り]

    研究論文(学術雑誌)

  • 平井 大志, 西田 勇, 佐藤 隆太, 白瀬 敬一

    In this study, an automatic process planning system for milling operation is proposed, in which user's intention for process planning is considered. First, our new process planning system stores the geometrical properties of the selected machining region when a user decides the machining sequence. After storing the geometrical properties, the appropriate machining sequence can be automatically selected by referring geometrical properties of the machining region. User's intention, which is involved implicitly in the stored geometrical properties of the machining region, can be applied to decide machining sequence. A case study was conducted to show the effectiveness of our new proposed process planning system. In the case study, user-specific machining sequences were automatically determined based on the implicit relation among the geometrical properties of the machining region and the individual user's intention.

    一般社団法人 日本機械学会, 2018年, 生産システム部門講演会講演論文集, 2018 (0), 511 - 511, 日本語

    [査読有り]

  • 津山 椋, 西田 勇, 佐藤 隆太, 白瀬 敬一

    In this study, autonomous end milling system for manufacturing custom-made dental prostheses was developed. This system can decide suitable machining orientation of dental prostheses to minimize unmachined volume automatically, and can prevent tool breakage by tool feed rate control based on the predicted cutting forces in end milling operation.

    一般社団法人 日本機械学会, 2018年, 関西支部講演会講演論文集, 2018 (0), 517 - 517, 日本語

    [査読有り]

  • 宮村 俊稀, 西田 勇, 佐藤 隆太, 白瀬 敬一

    This paper describes an automation system to realize autonomous sheet metal bending operation by industrial robot. This system can derive bending sequences using topological information in a CAD model of a sheet metal product, and can generate operation paths to control an industrial robot in consideration of its positions and configurations.

    一般社団法人 日本機械学会, 2018年, 関西支部講演会講演論文集, 2018 (0), 509 - 509, 日本語

    [査読有り]

  • 森下 喜一, 佐藤 隆太, 西田 勇, 白瀬 敬一, 岩崎 孝行, 長谷川 雅信, 斉藤 明

    Since motion accuracy of 5-axis machining centers directly influences the geometrical accuracy of the machined workpieces, accuracy enhancement of the 5-axis machining centers is strongly demanded. In order to improve the geometrical accuracy during the machining by a 5-axis machining centers, a method that modifies the CL-data based on the tracking errors normal to the machined surface at each command point has been proposed. In this study, the proposed method is applied to simultaneous 5-axis controlled machining to improve the motion accuracy. A normal vector calculation method for the simultaneous 5-axis controlled motion is newly proposed, and the compensation method is applied to the turbine blade machining by 5-axis controlled motions. Measurement tests of the cutting motion for the blade shape machining by a ball-end mill are carried out with the different control mode of the controller. The CL-data for machining tool path is also modified based on the calculated trajectory of the tool center point. Experimental results show that the feed speed and machining accuracy significantly depend on the control mode, and that the shape accuracy can be improved by applying the proposed compensation method without any decreasing of the motion speed.

    一般社団法人 日本機械学会, 2018年, 年次大会, 2018 (0), S1310002, 日本語

    [査読有り]

  • 西田 勇, 立川 宗治, 佐藤 隆太, 白瀬 敬一

    This study aims to develop a monitoring system, which can automatically detect tool wear in end-milling operation. A feature of this system is the utilization of the predicted cutting torque for detecting the difference between normal and cutting trouble. The cutting torque predicted by a cutting force simulator is compared with the cutting torque measured and evaluated from the driving torque of a spindle motor. Because the dynamic change of the cutting torque can be predicted by the cutting force simulator as the reference cutting torque, it is possible to detect cutting trouble correctly without disturbance arise from the changes of the cutting conditions and the machining form at every moment. In the cutting simulator, this study uses the workpiece voxel model in order to calculate the uncut chip thickness for the estimation of the cutting force. For the tool wear detection, 200 % increase of the average cutting torque is set as the threshold to detect 300 μm flank wear. In an experimental milling of a workpiece with holes using a worn square end mill, it is confirmed that the increase of the average cutting torque can be identified clearly in both of stationary and transient milling situations. It was verified that the tool flank wear could be detected correctly even in the dynamic change of milling operation.

    一般社団法人 日本機械学会, 2018年, 日本機械学会論文集, 84 (857), 17 - 00433-17-00433, 日本語

    [査読有り]

    研究論文(学術雑誌)

  • 西田 勇, 平井 大志, 佐藤 隆太, 白瀬 敬一

    2018年, 日本機械学会論文集, 84 (860), 日本語

    [査読有り]

    研究論文(学術雑誌)

  • 西田 勇, 奥村 龍馬, 佐藤 隆太, 白瀬 敬一

    ラジアスエンドミル加工の切削力予測のために,工具切れ刃形状および被削材形状のボクセルモデルで実切込み厚さを計算する切削力シミュレータを開発した.複雑な被削材形状を特殊な切れ刃形状のラジアスエンドミルで加工する場合でも実切込み厚さを検出することができる.予測した切削力は実測した切削力とよく一致した.

    公益社団法人 自動車技術会, 2018年, 自動車技術会論文集, 49 (1), 107 - 111, 日本語

    [査読有り]

    研究論文(学術雑誌)

  • NISHIDA ISAMU, OKUMURA RYUMA, SATO RYUTA, SHIRASE KEIICHI

    2017年12月, Journal of Manufacturing Science and Engineering (ASME), 140 (2), 英語

    [査読有り]

    研究論文(学術雑誌)

  • Shin Noguchi, Ryuta Sato, Isamu Nishida, Keiichi Shirase

    Since cutting force acts on feed drive and spindle drive systems as force disturbance, feed speed and spindle speed are changed. As the results, cutting force is also changed. In this study, a coupled simulation method of the vibration of machine tool, the dynamic behaviors of feed and spindle drive systems and the cutting force is developed. Simulation results are compared with the experimental results, and it is confirmed that the vibration of the feed and spindle drive systems due to the cutting force can be simulated by the proposed method. It is also confirmed that the cutting force influenced by the vibrations can be expressed.

    2017年11月13日, Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2017

    [査読有り]

    研究論文(国際会議プロシーディングス)

  • Kazuki Kaneko, Isamu Nishida, Ryuta Sato, Keiichi Shirase

    The purpose of this study is to propose a revised instantaneous rigid force model based on oblique cutting model for end-milling operation to eliminate predetermination of cutting coefficients. Although, six cutting coefficients are required for cutting force prediction in the conventional instantaneous rigid force model, the shear angle is only required in our revised force model. The determination of the shear angle is easier than the determination of six cutting coefficients from the cutting test. As a result from a validation, our revised force model can predict the cutting force more practically than the conventional instantaneous rigid force model.

    2017年11月13日, Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2017

    [査読有り]

    研究論文(国際会議プロシーディングス)

  • Isamu Nishida, Ryuta Sato, Keiichi Shirase

    In this study, a new method utilizing the similarity of removal volume to select the most similar machining case data is proposed to realize automated NC program generation. The geometric information of the removal volume, which is extracted by splitting total removal volume, and the cutting conditions associated with the removal volume are stored in database as a machining case data. The proposed method can select the most similar machining case data from database even for the complicated product shape, because each extracted removal volume is geometrically simple. In the case study for the validation of the proposed method, the cutting conditions were successfully determined from the most similar machining case data and an NC program was automatically generated appropriately.

    2017年11月13日, Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2017

    [査読有り]

    研究論文(国際会議プロシーディングス)

  • NISHIDA ISAMU, MAEDA MASATO, KAWANO TSUNEO, SHIRASE KEIICHI

    2017年05月, Journal of Ergonomics, 7 (2), 英語

    [査読有り]

    研究論文(学術雑誌)

  • 立川 宗治, 西田 勇, 佐藤 隆太, 白瀬 敬―

    エンドミル加工を対象に,シミュレーションで予測できる切削トルクと主軸モータから検出できる切削トルクを比較し,加工異常を検出する方法を提案する.加工中に加工状態が変化しても切削トルクの増大割合から工具摩耗を検出できることを確認し,また切削トルク波形のモニタリング結果とシミュレーション結果の類似度の変化から工具欠損を検出できることを確認した.

    一般社団法人 日本機械学会, 2017年, 生産システム部門講演会講演論文集, 2017 (0), 309 - 309, 日本語

    [査読有り]

  • 野口 晋, 西田 勇, 佐藤 隆太, 白瀬 敬一

    切削力は送り駆動系や主軸駆動系に外乱として作用し,断続切削では送り速度や主軸回転数の変動や機械の構造振動を励起するとともに,その振動で一刃当たりの送り量や切削速度が変動して切削力も変化する.本研究では主軸駆動系と送り駆動系の運動および機械の構造振動と切削力との連成シミュレーション技術を開発し,切削力により駆動系が振動し,それにより切削力が変動する現象を開発した方法で表現できることを確認した.

    公益社団法人 精密工学会, 2017年, 精密工学会学術講演会講演論文集, 2017 (0), 65 - 66, 日本語

    [査読有り]

  • 奥村 龍馬, 西田 勇, 佐藤 隆太, 白瀬 敬一

    加工中の切削力を推定し,切削力による工具の静変形を予測可能なシミュレータを開発した.このシミュレータは被削材のボクセルモデルを用いて,工具微小回転角ごとに実切込み厚さを計算して切削力を推定する.推定した切削力から工具変形および工具把持部の並進変形量を予測した.実加工による加工面とシミュレーションで予測した加工面を比較して,工具の静変形を考慮した切削加工シミュレーションの有効性を確認した.

    公益社団法人 精密工学会, 2017年, 精密工学会学術講演会講演論文集, 2017 (0), 999 - 1000, 日本語

    [査読有り]

  • CUTTING FORCE PREDICTION OF BALL END MILLING BASED ON FULLY VOXEL REPRESENTATION OF CUTTING EDGE AND INSTANTANEOUS WORKPIECE SHAPE

    Isamu Nishida, Ryuma Okumura, Ryuta Sato, Keiichi Shirase

    A new cutting force simulator has been developed to predict cutting force in ball end milling. This new simulator discretely calculates uncut chip thickness based on a fully voxel representation of the cutting edge and instantaneous workpiece shape. Previously, a workpiece voxel model was used to calculate uncut chip thickness under a complex change of workpiece shape. Using a workpiece voxel model, uncut chip thickness is detected by extracting the voxels removed per cutting edge tooth for the amount of material fed into the cutting edge. However, it is difficult to define the complicated shape of a cutting edge using the workpiece voxel model; the shape of the cutting edge must be defined by a mathematical expression. It is also difficult to model the voxels removed by the cutting edge when the tool posture is non-uniformly changed. We therefore propose a new method to detect uncut chip thickness, one in which both the cutting edge and the instantaneous workpiece shape are fully represented by a voxel model. Our proposed method precisely detects uncut chip thickness at minute tool rotational angles, making it possible to detect the uncut chip thickness between the complex surface shape of the workpiece and the particular shape of the cutting edge. To validate the effectiveness of our proposed method, experimental 5-axis milling tests using a ball end mill were conducted. Estimated milling forces for several tool postures were found to be in good agreement with the measured milling forces. Results from the experimental 5-axis milling validate the effectiveness of our proposed method.

    AMER SOC MECHANICAL ENGINEERS, 2017年, PROCEEDINGS OF THE ASME 12TH INTERNATIONAL MANUFACTURING SCIENCE AND ENGINEERING CONFERENCE - 2017, VOL 3, 英語

    [査読有り]

    研究論文(国際会議プロシーディングス)

  • MACHINING OPERATION PROCESS PLANNING SYSTEM CONSIDERING USER STRATEGIES AND INTENTIONS

    Taishi Hirai, Isamu Nishida, Ryuta Sato, Keiichi Shirase

    In this study, we propose a new process planning system for machining operations, one which considers user strategies and intentions for such operations. In previous process planning systems, the machining sequence is calculated geometrically, based on the Total Removal Volume (TRV) and the machining primitive region split from TRV. However, it remains difficult to determine the best machining sequence from among the large number of machining sequences calculated. Also, previous process planning systems do not consider user strategies and intentions in determining the appropriate machining sequence. Our new approach stores geometrical properties of the machining primitives when the user selects a machining sequence. Using these stored geometrical properties, the appropriate machining sequence can be automatically selected. User strategies and intentions are thus considered in determining a machining sequence based on learned geometrical properties. A case study was conducted to show the effectiveness of our proposed process planning approach. In the case study, user specific machining sequences were automatically determined for various users, based on the relation among the geometrical properties of the machining primitives and the individual user's strategies and intentions.

    AMER SOC MECHANICAL ENGINEERS, 2017年, PROCEEDINGS OF THE ASME 12TH INTERNATIONAL MANUFACTURING SCIENCE AND ENGINEERING CONFERENCE - 2017, VOL 3, 英語

    [査読有り]

    研究論文(国際会議プロシーディングス)

  • 西田 勇, 佐藤 隆太, 白瀬 敬一

    A new method of the process planning for end-milling operation considering product design constraints in this study. In our previous study, the process planning system, in which the Total Removal Volume is divided by the planes parallel with the XY, YZ or ZX planes to analyze machining sequence from top to bottom of the target product, is proposed. In this study, the process planning system, in which the Total Removal Volume is divided by all planes (including slope planes) existing on the target product, is proposed. Furthermore, the product design constraints or the designer's intention such as separate through holes which have the same central axis to be slide bearing is considered. A case study was conducted and the result showed that the proposed method can generate efficient multiple process plans for the machining operation. These multiple process plans or machining sequences are available to select adaptively the most suitable process plan or machining sequence under the several conditions such as the machine tool to be used and the product design constructions.

    一般社団法人 システム制御情報学会, 2017年, システム制御情報学会論文誌, 30 (3), 81 - 86, 日本語

    [査読有り]

    研究論文(学術雑誌)

  • 野口 晋, 西田 勇, 佐藤 隆太, 白瀬 敬一

    It is known that the cutting force excites the structural vibration of machine tool. In addition, cutting force acts on feed and spindle drive system as a force disturbance, and feed speed and spindle speed are changed. As the results, cutting force is also changed because the depth of cut and cutting speed are changed due to the machine vibration, feed and spindle speed changes. The purpose of this study is to analyze the coupled vibration between the machine tool behavior and the cutting force. In order to achieve the purpose, in this study, a coupled simulation method of the vibration of machine tool, the dynamic behaviors of feed and spindle drive systems and the cutting force is developed. Cutting force and machined surface geometry is simulated using the voxel simulator in which the workpieces is represented by voxels. Undeformed chip thickness can be calculated based on the relative position between the tool and workpieces, and the tool rotational angle at the each time step based on the voxel model. The cutting force is estimated based on the calculated undeformed chip thickness. The relative position between tool and workpiece at each time step is simulated by the feed drive system and machine tool structural models. The tool rotational angle is simulated by the spindle drive system model. The coupled simulation between the cutting force, structural vibration of machine tool and feed and spindle drive systems is carried out by applying the simulated cutting force and cutting torque as a disturbance to the feed and spindle drive systems and machine tool structure. Cutting tests and simulations are carried out with two kinds of radial depth of cut, 5 mm and 20 mm. It is confirmed that the machine tool dynamic behaviors due to the cutting force and torque which is also influenced by the machine tool behaviors can be simulated by the proposed method. It is also confirmed that the chatter vibration which is observed in case of the 20 mm depth of cut can be simulated by the proposed method.

    一般社団法人 日本機械学会, 2017年, 日本機械学会論文集, 83 (856), 17 - 00254-17-00254, 日本語

    [査読有り][招待有り]

    研究論文(学術雑誌)

  • 金子 和暉, 西田 勇, 佐藤 隆太, 白瀬 敬一

    In end milling, in order to improve machining efficiency and accuracy, instantaneous rigid force model is widely used to predict cutting force and improve cutting conditions. The instantaneous rigid force model is well known as the practically simple model to predict cutting force. However this model requires the six parameters called cutting coefficients which have to be determined by the experimental milling operation. So several experimental milling operations are needed before cutting force prediction. In this study, a new instantaneous rigid force model based on oblique cutting is proposed. In this force model, the end milling process is modeled using the oblique cutting model. Therefore, cutting force prediction can be realized using only the one parameter such as shear angle instead of the six parameters such as cutting coefficients required for a conventional instantaneous rigid force model. The shear angle can be determined from tangential milling force or milling torque. And this force model is easier to apply for practical cutting force prediction, because time and effort to determine the parameter(s) before cutting force prediction. The validation of this force model compared with the conventional force model is performed. As the result, cutting forces predicted by the proposed force model has good agreement with the measured cutting forces. Also, the proposed force model has good performance in a wide range of cutting conditions compared with the conventional force model.

    一般社団法人 日本機械学会, 2017年, 日本機械学会論文集, 83 (856), 17 - 00247-17-00247, 日本語

    [査読有り]

    研究論文(学術雑誌)

  • 被削材のボクセルモデルによるボールエンドミルの工具姿勢変化を考慮した5軸加工の切削力シミュレーション

    西田 勇, 奥村 龍馬, 佐藤 隆太, 白瀬 敬一

    2016年11月, 型技術ワークショップ2016 in なにわ講演論文, 46 - 47, 日本語

    研究論文(その他学術会議資料等)

  • CAM-CNC統合による革新的な知能化工作機械の開発

    西田 勇, 佐藤 隆太, 白瀬 敬一

    2016年11月, 第17回国際工作機械技術者会議論文集, 116 - 117, 日本語

    研究論文(その他学術会議資料等)

  • 切削トルクの予測結果と実測結果の比較に基づく加工異常検出システムの提案

    立川 宗治, 西田 勇, 佐藤 隆太, 白瀬 敬一

    砥粒加工学会, 2016年08月, 2016年度砥粒加工学会学術講演会(ABTEC2016)講演論文集, A03 - A03, 日本語

    [査読有り]

    研究論文(その他学術会議資料等)

  • 被削材のボクセルモデル表現によるボールエンドミル加工の切削力推定

    奥村 龍馬, 西田 勇, 佐藤 隆太, 白瀬 敬一

    2016年07月, 精密工学会2016年度関西地方定期学術講演会講演論文集, 32 - 33, 日本語

    [査読有り]

    研究論文(その他学術会議資料等)

  • 歯科補綴物の一貫加工システムの開発

    津山 椋, 西田 勇, 佐藤 隆太, 白瀬 敬一

    2016年07月, 精密工学会2016年度関西地方定期学術講演会講演論文集, 34 - 35, 日本語

    [査読有り]

    研究論文(その他学術会議資料等)

  • 西田 勇, 前田 正登, 川野 常夫, 白瀬 敬一

    2016年07月, 日本機械学会, 82 (840), 1600006 - 1600006, 日本語

    [査読有り]

    研究論文(学術雑誌)

  • NISHIDA ISAMU, MAEDA MASATO, KAWANO TSUNEO, SHIRASE KEIICHI

    2016年03月, Journal of Ergonomics, 6 (2), 100158 - 1000158, 英語

    [査読有り]

    研究論文(学術雑誌)

  • Isamu Nishida, Ryuta Sato, Keiichi Shirase

    This study proposes the method of the process planning for 5-axis machine tools. In our previous study, the process planning, in which the Total Removal Volume is divided by the planes parallel with the XY, YZ or ZX plane to analyze machining sequence from top to bottom of the target product, is proposed. In this study, the process planning system in which the Total Removal Volume is divided by all planes (including slope planes) existing on the target product is proposed. Furthermore, the design constraint or the designer's intention such as discontinuous through holes which have the same central axis is considered in this process planning. A case study was conducted and the result showed that the proposed method can design efficient multiple process plans for the machining operation. These multiple process plans or machining sequences allow users to select adaptively the suitable process plan or machining sequence based on the property of 5-axis machine tool to be used under the design constraint.

    IEEE, 2016年, 2016 INTERNATIONAL SYMPOSIUM ON FLEXIBLE AUTOMATION (ISFA), 2016 (ISFA), 352 - 355, 英語

    [査読有り]

    研究論文(国際会議プロシーディングス)

  • 堀本 凌輔, 西田 勇, 佐藤 隆太, 白瀬 敬一

    A new methodology to revise cutting conditions for machining operation planning has been developed in this study. In order to automate machining operation planning, reuse of cutting conditions in the past machining operations was proposed in our previous study. However, assessment and revision of cutting conditions are required to apply for the objective machining operation from the reference machining operation. For the assessment of cutting conditions, an acceptable area to select cutting conditions (AACC) is calculated. The AACC can be calculated under several limitations such as spindle power and maximum feed speed of machine tools, torsional and bending strength of cutting tools and so on. In the case that the reference cutting condition stays in the AACC, the reference cutting condition can be applied for the objective machining operation without any revision. In the case that the reference cutting condition stays out the AACC, the reference cutting condition should be revised to adapt for the objective machining operation. In our study, a methodology, which revises cutting conditions under keeping productivity, surface roughness (cusp height) and tool life, was proposed. In this report, an expanded methodology to revise cutting conditions by qualified relaxation of machining requirements is proposed to achieve wide range adaptation of the reference cutting conditions to the objective machining operation.

    一般社団法人 日本機械学会, 2016年, 年次大会, 2016 (0), S1320203 - S1320203, 日本語

    [査読有り]

    研究論文(その他学術会議資料等)

  • 金子 和暉, 西田 勇, 佐藤 隆太, 白瀬 敬一

    Instantaneous cutting force model is widely used for the cutting force prediction for end milling operation. However this model is required to prepare 6 parameters called cutting coefficients which can be determined from experimentally measured cutting forces. In this study, a new end-milling force prediction method based on oblique cutting model is proposed. This method can predict cutting force using only the experimentally predetermined shear angle instead of 6 cutting coefficients required for a conventional instantaneous cutting force model. This method is easier to apply for practical cutting force prediction, because it is easier to predetermine shear angle than 6 cutting coefficients.

    一般社団法人 日本機械学会, 2016年, 生産加工・工作機械部門講演会 : 生産と加工に関する学術講演会, 2016 (0), D18 - 206, 日本語

    研究論文(その他学術会議資料等)

  • Isamu Nishida, Kazuya Sata, Masato Maeda, Tsuneo Kawano, Keiich Shirase

    This study investigated a mechanism of muscle fatigue and proposed a muscular fatigue model to evaluate muscle fatigue progress under several muscular force patterns. Previous studies have already proposed a muscular fatigue model. However, these previous studies discussed about the condition of the maximum voluntary contraction. The new point of this study is considering several muscular force patterns including muscle recovery progress. This study proposed the method to estimate the endurance time for keeping constant forces considering the physical characteristics. This study also proposed the method to estimate the iteration numbers for keeping constant forces with interval. To validate the effectiveness of the proposed method, experimental verifications were conducted. The experimental results had a good agreement with the evaluation of muscle fatigue progress using the proposed method. The results of this study will provide ergonomically safe and efficient working environments considering the physical properties of each worker.

    SPRINGER INT PUBLISHING AG, 2016年, ADVANCES IN PHYSICAL ERGONOMICS AND HUMAN FACTORS, 489, 515 - 525, 英語

    [査読有り]

    研究論文(国際会議プロシーディングス)

  • 拮抗筋および二関節筋を考慮した下肢筋力の推定手法 -ジョギング動作における下肢筋力の推定-

    西田 勇, D. Gordon, E. Robertson, 前田 正登, 川野 常夫, 白瀬 敬一

    2012年01月, 日本人間工学会, 48 (2), 62 - 69, 日本語

    [査読有り]

    研究論文(学術雑誌)

  • 拮抗筋および二関節筋を考慮した下肢筋力の推定手法 -垂直跳びにおける下肢筋力の推定-

    西田 勇, 前田 正登, 川野 常夫, 白瀬 敬一

    2011年09月, 日本人間工学会, 47 (6), 244 - 251, 日本語

    [査読有り]

    研究論文(学術雑誌)

  • Estimation of Ground Reaction Forces during Walking

    NISHIDA ISAMU, D. Gordon, E. Robertson, MAEDA MASATO, KAWANO TSUNEO, SHIRASE KEIICHI

    2011年06月, Biomechanics in Sports, 11 (2), 547 - 550, 英語

    [査読有り]

    研究論文(学術雑誌)

  • Isamu Nishida, Masato Maeda, D. Gordon, E. Robertson, Keiichi Shirase

    This study investigated a musculoskeletal model that includes the function of the antagonistic muscles and biarticular muscles and models muscles acting across the hip, knee and ankle joints, simultaneously. Furthermore, this study can be applied to dynamic motions. One vertical jump trials were conducted to validate the proposed model. Electromyograms (EMGs) of tibials anterior, gastrocnemius, soleus, rectus femoris, vastus lateralis, semimembranosus, biceps femoris, short head and gluteus maximus were used to compare with the estimated muscle forces. The results showed that the muscle forces estimated by the proposed method had a stronger correlation with EMGs than those of an optimization method. The correlations of the proposed method and the optimization method were 0.4 and 0.01 of TA, 0.95 and 0.86 of GAS, 0.95 and 0.93 of SOL, 0.94 and 0.01 of RF, 0.93 and 0.97 of VAS, 0.83 and 0.91 of SM, 0.75 and 0.01 of BFSH and 0.95 and 0.92 of GMAX. Thus, the proposed method was considered to successfully estimate the muscle forces during vertical jumping. (C) 2011 Published by Elsevier Ltd. Selection and peer-review under responsibility of RMIT University

    ELSEVIER SCIENCE BV, 2011年, 5TH ASIA-PACIFIC CONGRESS ON SPORTS TECHNOLOGY (APCST), 13, 338 - 343, 英語

    [査読有り]

    研究論文(国際会議プロシーディングス)

MISC

  • B9 筋肉の疲労進展を評価する筋疲労モデルの提案(筋特性)

    佐田 和也, 西田 勇, 川野 常夫, 白瀬 敬一

    For several decades, factory automation or unmanned factory productivity has been progressed to realize much higher productivity in manufacturing. However, human centered manufacturing system is getting attention to realize much more flexibility for manufacturing of wide product variety and volume. In this study, a mechanism of muscle fatigue is investigated, and a muscular fatigue model to evaluate muscle fatigue progress under several muscular force patterns is proposed. Furthermore, the endurance time for keeping constant force by the participant is estimated considering physical characteristics of the participant. In order to show the effectiveness of the proposed method, experimental verifications were conducted. The experimental results had a good agreement with the evaluation of muscle fatigue progress using the proposed method. The proposed model contributes to evaluate the ergonomic working environments and the comfortable working motions.

    一般社団法人日本機械学会, 2011年10月30日, シンポジウム: スポーツ・アンド・ヒューマン・ダイナミクス講演論文集 : symposium on sports and human dynamics, 2011, 298 - 302, 日本語

  • B33 短距離走クラウチングスタートにおけるブロッククリアランス技術(走動作,ほか)

    篠原 康男, 西田 勇, 前田 正登

    In the sprint, the sprinters are required to use starting blocks at the crouch start. Therefore, it is important to clarify the technique of block clearance in order to improve sprint performance. The purpose of this study is to examine the technique of block clearance from joint torque and joint power in lower extremity applied to the starting blocks by sprinters. From starting blocks, six sprinters did the "starting dash" as is done in a sprint running race, and the forces applied to the right and left starting block were measured by with the force plates (1kHz). And, the block clearance movement was recorded by Hi-speed camera (250Hz). The results can be summarized as follows. There were two different patterns about the joint torque and power applied to the rear block. The type of pushing the rear block was presumed to have exhibited the extension torque and power at the hip and ankle of the rear leg. On the other hand, the type of pulling the rear leg from the rear block was presumed to have exhibited the flexion torque at the hip and the extension torque and power at the knee and ankle of the rear leg.

    一般社団法人日本機械学会, 2011年10月30日, シンポジウム: スポーツ・アンド・ヒューマン・ダイナミクス講演論文集 : symposium on sports and human dynamics, 2011, 412 - 417, 日本語

  • B11 立幅跳びにおける桔抗筋および二関節筋を考慮した下肢筋力の推定手法の検証(筋特性)

    西田 勇, 前田 正登, 川野 常夫, 白瀬 敬一

    Estimation of muscle forces during human motions is important in the fields of sport, ergonomics and bioengineering in order to improve sport techniques, rehabilitation procedures, product designs and work environments, and so on. In general, in the musculoskeletal models that have been developed, the functions of antagonistic muscles and biarticular muscles are not considered to estimate muscle forces. In this study, a musculoskeletal model that considered the functions of the antagonistic muscles and biarticular muscles was investigated. In this model, muscles acting across the hip, knee and ankle joints were treated simultaneously. Furthermore, in this study, standing long jump as dynamic motion was conducted to validate the proposed model to estimate muscle forces. Surface electromyograms (EMGs) of tibialis anterior, gastrocnemius, soleus, rectus femoris, vastus lateralis, semimembranosus, biceps femoris and short head and gluteus maximus were measured to compare with the estimated muscle forces. The experimental results showed that the muscle forces estimated by the proposed method had a good agreement with the EMGs of muscles.

    一般社団法人日本機械学会, 2011年10月30日, シンポジウム: スポーツ・アンド・ヒューマン・ダイナミクス講演論文集 : symposium on sports and human dynamics, 2011, 309 - 314, 日本語

  • Isamu Nishida, Masato Maeda, Tsuneo Kawano, Keiichi Shirase

    ELSEVIER SCIENCE BV, 2010年, ENGINEERING OF SPORT 8: ENGINEERING EMOTION - 8TH CONFERENCE OF THE INTERNATIONAL SPORTS ENGINEERING ASSOCIATION (ISEA), 2 (2), 3463 - 3463, 英語

    研究発表ペーパー・要旨(国際会議)

講演・口頭発表等

  • Influence of Non-linear Friction Characteristics of Linear Guide and Ball Screw in Milling Operation

    SATO RYUTA, NOGUCHI SHIN, NISHIDA ISAMU, SHIRASE KEIICHI

    8th International Conference on Virtual Machining Process Technology, 2019年04月, 英語, CIRP, Vancouver, 国際会議

    口頭発表(一般)

  • 切削シミュレータを統合したエンドミル加工用CAMの開発

    西田 勇, 白瀬 敬一

    型技術者会議2019, 2019年, 日本語, 国内会議

    口頭発表(一般)

  • Automated measuring planning for on-machinine measurement and re-machining process

    Murase Motoaki, Nishida Isamu, Sato Ryuta, Shirase Keiichi

    14th International Manufacturing Science and Engineering Conference, 2019年, 英語, 国際会議

    口頭発表(一般)

  • Enhancement of Motion Accuracy for Cone-frustum Cutting Motion by Modified NC Program

    MORISHITA KIICHI, SATO RYUTA, SHIRASE KEIICHI, NISHIDA ISAMU

    the ASME 2018 Manufacturing Science and Engineering Conference, 2018年06月, 英語, ASME, Colleage Station, 国際会議

    口頭発表(一般)

  • 熟練者のノウハウを反映した工具経路自動生成

    西田 勇, 白瀬 敬一

    第18回国際工作機械技術者会議, 2018年, 日本語, 国内会議

    ポスター発表

  • 作業設計を考慮したエンドミル加工用自動工程設計システム(工具交換回数を最小化する工程設計)

    西田 勇, 白瀬 敬一

    日本機械学会2018年度年次大会, 2018年, 日本語, 国内会議

    口頭発表(一般)

  • 機械加工用自動工程設計におけるユーザの意図を反映した工程案の導出

    平井大志, 西田 勇, 佐藤 隆太, 白瀬 敬一

    日本機械学会生産システム部門研究発表講演会, 2018年, 日本語, 国内会議

    口頭発表(一般)

  • 機械加工部品の設計情報を利用した機上計測の自動化

    村瀬元章, 西田 勇, 佐藤 隆太, 白瀬 敬一

    精密工学会第25回学生会員卒業研究発表講演会, 2018年, 日本語, 国内会議

    口頭発表(一般)

  • ロボットによる板金曲げ加工の自律作業を実現する曲げ順序計画および動作経路生成の自動化

    宮村俊稀, 西田 勇, 佐藤 隆太, 白瀬 敬一

    日本機械学会関西支部第93期定時総会講演会, 2018年, 日本語, 国内会議

    口頭発表(一般)

  • ボールエンドミル先端部の切削抵抗を考慮した切削力シミュレーション

    中村貴也, 西田 勇, 佐藤 隆太, 白瀬 敬一

    日本機械学会関西支部2017年度学生員卒業研究発表講演会, 2018年, 日本語, 国内会議

    口頭発表(一般)

  • エンドミル加工における工具系の弾性変形の予測結果に基づく加工誤差補正法

    西田 勇, 白瀬 敬一

    精密工学会2018年度秋季大会学術講演会, 2018年, 日本語, 国内会議

    ポスター発表

  • Voxel based cutting force simulation of ball end milling considering cutting edge around ceter web

    Nishida Isamu, Nakamura Takaya, Sato Ryuta, Shirase Keiichi

    13th International Manufacturing Science and Engineering Conference, 2018年, 英語, 国際会議

    口頭発表(一般)

  • Virtual milling force monitoring method based on in-process milling force prediction model to eliminate predetermination of cutting coefficients

    Kazuki Kaneko, Nishida Isamu, Sato Ryuta, Shirase Keiichi

    8th CIRP Conference on High Performance Cutting, 2018年, 英語, 国際会議

    口頭発表(一般)

  • Tool chipping detection based on spindle motor torque distortion in end-milling

    Kaneko Kazuki, Nishida Isamu, Sato Ryuta, Shirase Keiichi

    17th International Conference on Precision Engineering, 2018年, 英語, 国際会議

    口頭発表(一般)

  • NCプログラムの自動生成と加工時間予測で実現する製品形状に応じた工作機械の割当て

    西田 勇, 白瀬 敬一

    型技術ワークショップ2018 in ふくい, 2018年, 日本語, 国内会議

    口頭発表(一般)

  • Muscle force prediction method considering the role of antagonistic muscle

    Daiju Yuki, Nishida Isamu, Sato Ryuta, Shirase Keiichi

    9th International Conference on Applied Human Factors and Ergonomics, 2018年, 英語, 国際会議

    口頭発表(一般)

  • Cutting Force and Finish Surface Simulation of End Milling Operation in Consideration of Static Tool Deflection by Using Voxel Model

    Nishida Isamu, Okumura Ryuma, Sato Ryuta, Shirase Keiichi

    8th CIRP Conference on High Performance Cutting, 2018年, 英語, 国際会議

    口頭発表(一般)

  • CAM操作を必要としない歯科補綴物の自律加工

    津山椋, 西田 勇, 佐藤 隆太, 白瀬 敬一

    日本機械学会関西支部第93期定時総会講演会, 2018年, 日本語, 国内会議

    口頭発表(一般)

  • Automation of on-machine measurement based on 3D CAD model of product

    Murase Motoaki, Nishida Isamu, Sato Ryuta, Shirase Keiichi

    2018 International Symposium on Flexible Automation, 2018年, 英語, 国際会議

    口頭発表(一般)

  • Automatic process planning system for end-milling operation reflecting CAM operator’s intentnion

    Nishida Isamu, Hirai Taishi, Sato Ryuta, Shirase Keiichi

    2018 International Symposium on Flexible Automation, 2018年, 英語, 国際会議

    口頭発表(一般)

  • Determination of Cutting Conditions for NC Program Generation by Reusing Machining Case Data based on Removal Volume Feature

    NISHIDA ISAMU, SATO RYUTA, SHIRASE KEIICHI

    9th International Conference on Leading Edge Manufacturing in 21st Century (LEM21), 2017年11月, 英語, JSME, 広島市, 国際会議

    口頭発表(一般)

  • Coupled Simulation between Machine Tool Behavior and Cutting Force using Voxel Simulator

    NOGUCHI SHIN, SATO RYUTA, NISHIDA ISAMU, SHIRASE KEIICHI

    9th International Conference on Leading Edge Manufacturing in 21st Century (LEM21), 2017年11月, 英語, JSME, 広島市, 国際会議

    口頭発表(一般)

  • A revised instantaneous rigid force model for end-milling operation to eliminate predetermination of cutting coefficients

    KANEKO KAZUKI, NISHIDA ISAMU, SATO RYUTA, SHIRASE KEIICHI

    9th International Conference on Leading Edge Manufacturing in 21st Century (LEM21), 2017年11月, 英語, JSME, 広島市, 国際会議

    口頭発表(一般)

  • ボクセルモデルを用いた切削力シミュレータによる工作機械の動的挙動と切削力の時間領域連成シミュレーション

    野口 晋, 西田 勇, 佐藤 隆太, 白瀬 敬一

    2017年度精密工学会秋季大会学術講演会, 2017年09月, 日本語, 豊中市, 国内会議

    口頭発表(一般)

  • 冗長筋群を考慮した筋骨格モデルによる筋力推定

    第十 祐幹, 西田 勇, 白瀬 敬一

    日本機械学会シンポジウム:スポーツ工学・ヒューマンダイナミクス2017, 2017年, 日本語, 国内会議

    口頭発表(一般)

  • 工具切れ刃形状および被削材形状のボクセルモデルによるラジアスエンドミルの切削力シミュレーション

    西田 勇, 奥村 龍馬, 佐藤 隆太, 白瀬 敬一

    自動車技術会2017年春季大会学術講演会, 2017年, 日本語, 国内会議

    口頭発表(一般)

  • 工具の静変形を考慮したエンドミル加工の切削加工シミュレーション

    奥村 龍馬, 西田 勇, 佐藤 隆太, 白瀬 敬一

    精密工学会2017年度秋季大会学術講演会, 2017年, 日本語, 国内会議

    口頭発表(一般)

  • ロボットによる板金曲げ加工のための工程設計および作業設計の自動化

    宮村 俊稀, 西田 勇, 佐藤 隆太, 白瀬 敬一

    密工学会2017年度関西地方定期学術講演会, 2017年, 日本語, 国内会議

    ポスター発表

  • ユーザの戦略や意図を考慮した機械加工用工程設計支援システムの開発

    平井 大志, 西田 勇, 佐藤 隆太, 白瀬 敬一

    密工学会2017年度関西地方定期学術講演会, 2017年, 日本語, 国内会議

    ポスター発表

  • スクエアエンドミル加工における工具摩耗予測手法

    笠谷 和樹, 西田 勇, 佐藤 隆太, 白瀬 敬一

    密工学会2017年度関西地方定期学術講演会, 2017年, 日本語, 国内会議

    ポスター発表

  • エンドミル加工における切削トルクの予測結果と実測結果の定量比較による加工異常検出

    立川 宗治, 西田 勇, 佐藤 隆太, 白瀬 敬一

    日本機械学会生産システム部門研究発表講演会2017, 2017年, 日本語, 国内会議

    口頭発表(一般)

  • Machining operation process planning system considering user strategies and intentions

    Hirai Taishi, Nishida Isamu, Sato Ryuta, Shirase Keiichi

    ASME 2017 12th International Manufacturing Science and Engineering Conference, 2017年, 英語, 国際会議

    口頭発表(一般)

  • Cutting force prediction of ball end milling based on fully voxel representation of cutting edge and instantaneous workpiece shape

    Nishida Isamu, Okumura Ryuma, Sato Ryuta, Shirase Keiichi

    ASME 2017 12th International Manufacturing Science and Engineering Conference, 2017年, 英語, 国際会議

    口頭発表(一般)

  • CAM-CNC統合による革新的な工作機械の知能化 –試作版の実装と評価-

    西田 勇, 白瀬 敬一, 尾西 雅弘, 小嵐 勝幸

    型技術ワークショップ2017 in 岡山, 2017年, 日本語, 国内会議

    口頭発表(一般)

  • 被削材のボクセルモデル表現によるボールエンドミル加工の切削力推定

    奥村 龍馬, 西田 勇, 佐藤 隆太, 白瀬 敬一

    精密工学会2016年度関西地方定期学術講演会, 2016年, 日本語, 国内会議

    ポスター発表

  • 被削材のボクセルモデルによるボールエンドミルの工具姿勢変化を考慮した5軸加工の切削力シミュレーション

    西田 勇, 佐藤 隆太, 白瀬 敬一

    型技術ワークショップ2016 in なにわ, 2016年, 日本語, 国内会議

    口頭発表(一般)

  • 切削トルクの予測結果と実測結果の比較に基づく加工異常検出システムの提案

    立川 宗治, 西田 勇, 佐藤 隆太, 白瀬 敬一

    2016年度砥粒加工学会学術講演会, 2016年, 日本語, 国内会議

    口頭発表(一般)

  • 疾走時の地面反力の推定に関する研究

    岡野 達哉, 西田 勇, 前田 正登

    日本機械学会シンポジウム:スポーツアンド・ヒューマンダイナミクス2016, 2016年, 日本語, 国内会議

    口頭発表(一般)

  • 歯科補綴物の一貫加工システムの開発

    津山 椋, 西田 勇, 佐藤 隆太, 白瀬 敬一

    精密工学会2016年度関西地方定期学術講演会, 2016年, 日本語, 国内会議

    ポスター発表

  • 傾斜切削理論に基づくエンドミル加工の切削力予測モデルの提案

    金子 和暉, 西田 勇, 佐藤 隆太, 白瀬 敬一

    日本機械学会第11回生産加工・工作機械部門講演会, 2016年, 日本語, 国内会議

    口頭発表(一般)

  • 加工事例を参照する作業設計における切削条件の適応的修正法(第2報:制約条件緩和による切削条件修正法の拡張)

    堀本 凌輔, 西田 勇, 佐藤 隆太, 白瀬 敬一

    日本機械学会2016年度年次大会, 2016年, 日本語, 国内会議

    口頭発表(一般)

  • Process Planning System of 5-Axis Machining Center Considering Constraint Condition

    Nishida Isamu, Sato Ryuta, Shirase Keiichi

    2016 International Symposium on Flexible Automation, 2016年, 英語, 国際会議

    口頭発表(一般)

  • CAM-CNC統合による革新的な知能化工作機械の開発

    西田 勇, 佐藤 隆太, 白瀬 敬一

    第17回国際工作機械技術者会議, 2016年, 日本語, 国内会議

    ポスター発表

  • CAM-CNC統合による革新的な工作機械の知能化 -切削力の予測結果に基づく適応制御-

    西田 勇, 白瀬 敬一, 尾西 雅弘, 小嵐 勝幸

    型技術ワークショップ2016 in なにわ, 2016年, 日本語, 国内会議

    口頭発表(一般)

  • 立幅跳びにおける拮抗筋及び二関節筋を考慮した下肢筋力の推定手法の検証

    西田 勇, 前田 正登, 川野常夫, 白瀬 敬一

    日本機械学会シンポジウム:スポーツアンド・ヒューマンダイナミクス2011, 2011年, 日本語, 国内会議

    口頭発表(一般)

  • 短距離走クラウチングスタートにおけるブロッククリアランス技術

    篠原 康男, 西田 勇, 前田 正登

    日本機械学会シンポジウム:スポーツアンド・ヒューマンダイナミクス2011, 2011年, 日本語, 国内会議

    口頭発表(一般)

  • 筋肉の疲労進展を評価する筋疲労モデルの提案

    佐田 和也, 西田 勇, 川野常夫, 白瀬 敬一

    日本機械学会シンポジウム:スポーツアンド・ヒューマンダイナミクス2011, 2011年, 日本語, 国内会議

    口頭発表(一般)

  • Validation of muscle forces during jogging estimated with an ergonomic musculoskeletal model

    Nishida Isamu, D. Gordon, E. Robertson, Maeda Masato, Kawano Tsuneo, Shirase Keiichi

    International Society of Biomechanics 2011, 2011年, 英語, 国際会議

    口頭発表(一般)

  • Development of an ergonomic musculoskeletal model to estimate muscle forces during vertical jumping

    Nishida Isamu, D. Gordon, E. Robertson, Maeda Masato, Kawano Tsuneo, Shirase Keiichi

    5th Asia-Pacific Congress on Sports Technology, 2011年, 英語, 国際会議

    口頭発表(一般)

  • Optimization of Lifting Posture Based on Motion Analysis Using Musculoskeletal Human Model Considering Bi-articular Muscle Function

    Nishida Isamu, Maeda Masato, Kawano Tsuneo, Shirase Keiichi

    2010 Asian Conference on Design and Digital Engineering, 2010年, 英語, 国際会議

    口頭発表(一般)

  • A study on improving performance in vertical jump motion considering bi-articular muscle function

    Nishida Isamu, Maeda Masato, Kawano Tsuneo, Shirase Keiichi

    8TH CONFERENCE OF THE INTERNATIONAL SPORTS ENGINEERING ASSOCIATION (ISEA), 2010年, 英語, 国際会議

    ポスター発表

  • Lower Limbs Muscular Power In Vertical Jump Estimated By Human Musculo-Skeletal Model Considering Bi-Articular Muscle Function

    NISHIDA ISAMU, MAEDA MASATO, SHIRASE KEIICHI

    4th Asia-Pacific Congress on Sports Technology, 2009年09月, 英語, 国際会議

    口頭発表(一般)

  • 作業評価に用いる二関節筋を考慮した筋骨格モデルの研究

    西田 勇, 前田 正登, 川野常夫, 白瀬 敬一

    精密工学会2009年度秋季大会, 2009年, 日本語, 国内会議

    口頭発表(一般)

  • 二関節筋を考慮した筋骨格モデルを用いた垂直跳びにおける下肢筋力の推定

    西田 勇, 阪口 龍彦, 前田 正登, 白瀬 敬一

    日本機械学会シンポジウム:スポーツアンド・ヒューマンダイナミクス2008, 2008年, 日本語, 国内会議

    口頭発表(一般)

共同研究・競争的資金等の研究課題

産業財産権

  • 形状認識装置,および形状認識方法

    西田勇

    特願2020-085466, 2020年05月14日

    特許権

  • NCデータ生成装置,およびNCデータ生成プログラム

    西田勇, 中辻秀憲

    特願2019-226707, 2019年12月16日

    特許権

  • NCデータ変更装置,およびNCデータ変更プログラム

    西田 勇

    特願2019-169667, 2019年09月18日

    特許権

  • 生産計画策定装置,生産計画策定プログラム,および生産計画策定方法

    西田 勇

    特願2019-121418, 2019年06月28日

    特許権

  • 加工シミュレーションシステム,および加工シミュレーションプログラム

    西田 勇

    特願2019-094659, 2019年05月20日

    特許権

  • 工程設計システム,および加工順序決定方法

    西田 勇

    特願2018-084733, 2018年04月26日

    特許権

  • 切削シミュレーション方法および装置

    西田 勇

    特願2017-196099, 2017年10月06日

    特許権

  • 加工支援システム

    西田 勇

    特願2017-043061, 2017年03月07日

    特許権

  • 加工支援システム

    西田 勇

    特願2016-243789, 2016年12月15日

    特許権

  • 工程設計支援システム、および、工程設計支援方法

    西田 勇

    特願2016-114701, 2016年06月08日

    特許権