Generation mechanism and suppression measures of chatter vibration of workpiece deformation type in cutting thin-walled cylindrical workpiece

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04283
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 20010:Mechanics and mechatronics-related
• Research Institution: Osaka Sangyo University
• Principal Investigator: KURITA Yutaka 大阪産業大学, 工学部, 教授 (70275171)
• Co-Investigator(Kenkyū-buntansha): 大浦 靖典 滋賀県立大学, 工学部, 准教授 (60512770) ; 田中 昂 滋賀県立大学, 工学部, 講師 (60759273)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: びびり振動 / 固有振動 / 連成振動系 / 安定判別 / 自励振動 / 切削加工 / 薄肉円筒 / 減衰

Outline of Final Research Achievements

This report describes the generation mechanism of chatter vibration in cutting thin-walled cylindrical workpieces. Cylindrical workpieces have two natural vibrations with the same number of node diameters but different positions (sine mode and cosine mode). During cutting, coupling occurs between these two natural vibrations, forming a feedback loop. The open-loop transfer function of this coupled vibration system is calculated by dividing it into three parts: principal force - thrust force, thrust force -translational displacement, and translational displacement - principal force. When the gain of the open-loop transfer function becomes larger than 1 at the phase crossover frequency, chatter vibration is generated at the frequency.

Free Research Field

機械力学

Academic Significance and Societal Importance of the Research Achievements

航空機産業などで，軽量化のために薄肉部品の使用が増加している。薄肉円筒工作物の切削加工時には，工作物の円形断面が変形するびびり振動が発生する。びびり振動が発生すると，加工品質が低下するので，試行錯誤的なびびり振動対策が行われているものの，十分な振動抑制効果が得られていない。びびり振動の発生メカニズムの解明によって，合理的な振動抑制対策が確立できれば，軽量で質の良い薄肉部品を，短時間で製作できるようになる。