Development of active stiffness control system to avoid chatter vibration

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K14631
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 18020:Manufacturing and production engineering-related
• Research Institution: Kanazawa Institute of Technology
• Principal Investigator: Hayashi Akio 金沢工業大学, 工学部, 准教授 (50734430)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 工作機械 / びびり振動 / 剛性制御 / 安定限界線図

Outline of Final Research Achievements

We carried out research with the aim of proposing a method and developing a system to avoid and suppress the occurrence of chatter vibration during machining by controlling the rigidity (dynamic characteristics) of machine tools. The effectiveness of the proposed method was demonstrated through simulations by changing the stiffness parameters. In addition, the rigidity of the actual machine was changed by applying tension to the press bar attached to the frame of the machine tool, and changes in mechanical dynamic characteristics were measured through hammering tests. It was confirmed that the stability limit diagram changed based on the results. Furthermore, we verified the chatter vibration suppression effect based on the transition of the stability limit diagram through machining experiments, and evaluated the validity and effectiveness of the proposed method.

Free Research Field

加工学および生産工学関連

Academic Significance and Societal Importance of the Research Achievements

切削加工時に発生する「びびり振動」は製品の加工精度や表面粗さなどに悪影響をおよぼすため、これを回避するために切削条件を調整して加工されている。一方で、高速・高精度な大量生産が望まれるため切削条件の変更は望ましくないことが多く、機械側での回避手法が求められている。本研究成果により、機械自体の剛性を変更することでびびり振動を回避することができ、所望の切削条件での加工が可能となることで、工作機械メーカとしては機械に振動回避機能を付与することで新たな性能を持つ機械開発ができ、これを利用する生産現場ではさらなる製品加工の高速・高精度化が見込まれる。