微铣削中考虑时变切削力系数的颤振稳定性预测

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摘要颤振问题严重制约了微铣床的加工效率和加工质量。加工过程中刀具的磨损使得系统的颤振稳定性预测精度逐渐降低。为解决上述问题，我们引入时变可靠性理论，并用Gamma过程描述刀刃半径随切削时间的变化关系。建立了系统的时变切削力、时变稳定性和时变可靠性模型，分析了给定条件下系统的颤振稳定性和颤振可靠度随加工时间的变化关系。给出了微铣削在高速铣削过程中在给定切深和主轴转速下系统的颤振时变稳定性和颤振时变可靠性的算例研究。研究表明：随着加工时间的增加系统的颤振稳定性逐渐降低，文中提出的方法能够更准确的预测出不同加工时间内系统的颤振稳定性。

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	刘宇1 王振宇1 杨慧刚2 张义民1

关键词 ：刀刃半径, 切削力系数, Gamma过程, 颤振时变稳定性, 颤振时变可靠度

Abstract：

Chatter problems in milling severely affect productivity and quality of machining. Tool wear causes cutting force coefficient, process damping coefficient, and other parameters to change with cutting time. These variations significantly reduce the accuracy of chatter prediction using conventional methods. To solve this problem, the time-varying reliability theory was introduced, and Gamma process was used to describe the relationship between tool edge radius and cutting time. The models for a micro milling system’s cutting force coefficients, time-varying stability and time-varying reliability were established. The changes of the system’s chatter stability and chatter reliability with cutting time under the given conditions were analyzed. The system’s chatter time-varying stability and chatter time-varying reliability were investigated under given cutting depths and spindle speeds. The results of case study showed that with increase in cutting time, the system’s chatter stability drops gradually; the proposed method can be used to predict the system’s chatter stability more accurately within different cutting time intervals.

Key words： tool edge radius cutting force coefficients Gamma process chatter time-varying stability chatter time-varying reliability

收稿日期: 2016-05-17 出版日期: 2018-01-28

引用本文:

刘宇1 王振宇1 杨慧刚2 张义民1. 微铣削中考虑时变切削力系数的颤振稳定性预测[J]. 振动与冲击, 2018, 37(3): 160-166.
LIU Yu1 WANG zhenyu1 YANG Huigang2 ZHANG Yimin1. Chatter stability prediction for micro-milling processes with time-varying cutting force coefficients. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(3): 160-166.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I3/160

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