基于动力学及切削特性耦合的数控机床结构设计

杨毅青 刘强 申江丽 田恺

振动与冲击 ›› 2013, Vol. 32 ›› Issue (10) : 198-202.

PDF(2176 KB)
PDF(2176 KB)
振动与冲击 ›› 2013, Vol. 32 ›› Issue (10) : 198-202.
论文

基于动力学及切削特性耦合的数控机床结构设计

  • 杨毅青 刘强 申江丽 田恺
作者信息 +

Machine Tool Structure Design Based on the Coupling Analysis of Dynamics and Cutting Performances

  • YANG Yiqing LIU Qiang SHEN Jiangli TIAN Kai
Author information +
文章历史 +

摘要

切削性能是评价数控机床好坏的重要指标之一,在结构设计阶段必须加以考虑。以提高实验室自主研发的立卧转换四轴联动数控机床的切削性能为目的,研究基于动力学特性与切削特性耦合的机床结构设计优化方法。首先结合切削加工中的颤振稳定域理论,通过实验获取机床刀尖频响函数和切削力系数,预测切削加工时的三维颤振稳定域图(主轴转速-切宽-切深)及颤振频率图(主轴转速-切宽-频率)。其次采用实验模态技术对整机进行结构动力学测试及分析,在获取可视化振型的基础上,分析引起机床发生颤振,并导致切削性能降低的结构设计上的缺陷。在此基础上,改进主轴头结构并比较刀尖频响函数,结果表明系统动刚度约增加28.2%,机床抵抗切削颤振的能力得到明显加强。

Abstract

Cutting performance is one of the most important factors to judge the NC machine tool, therefore it should be considered at the design stage. A structure design method by coupling the dynamics and cutting performance was investigated in order to promote the overall performance of a 4-axis milling machine developed by the laboratory. Combining with the chatter theory in machining, three dimensional chatter stability (spindle speed - width of cut – depth of cut) and chatter frequency (spindle speed - width of cut – chatter frequency) were predicted after acquiring the frequency response function (FRF) at the tool tip and cutting coefficients from the experiments. Next, experimental modal analysis was employed to test the machine. The roots of chatter occurrence, which was resulted from the inappropriate design, could be figured out after obtaining the visualized mode shape of the machine. In the end, the parallel spindle head of the machine was modified and the tool tip FRF comparison shows that the dynamic stiffness of the target mode is improved 28.2%, which is beneficial for the chatter resistance.

关键词

数控机床 动力学 模态测试 颤振

Key words

NC machine tool Dynamics Modal test Chatter

引用本文

导出引用
杨毅青 刘强 申江丽 田恺. 基于动力学及切削特性耦合的数控机床结构设计[J]. 振动与冲击, 2013, 32(10): 198-202
YANG Yiqing LIU Qiang SHEN Jiangli TIAN Kai. Machine Tool Structure Design Based on the Coupling Analysis of Dynamics and Cutting Performances[J]. Journal of Vibration and Shock, 2013, 32(10): 198-202

PDF(2176 KB)

Accesses

Citation

Detail

段落导航
相关文章

/