• CN:11-2187/TH
  • ISSN:0577-6686

›› 2011, Vol. 47 ›› Issue (23): 186-192.

• 论文 • 上一篇    下一篇

正交车铣偏心加工三维颤振稳定性的研究

朱立达;王宛山;李鹤; 于天彪   

  1. 东北大学机械工程与自动化学院
  • 发布日期:2011-12-05

Research on 3D Chatter Stability of Orthogonal and Eccentric Turn-milling

ZHU Lida;WANG Wanshan;LI He;YU Tianbiao   

  1. School of Mechanical Engineering and Automation, Northeastern University
  • Published:2011-12-05

摘要: 针对正交车铣复杂运动产生变深度、变厚度的切削特性,基于其加工原理采用解析法提出三维颤振稳定域的理论模型。在模态试验基础上,仿真分析正交车铣偏心加工颤振稳定域叶瓣图,结果表明正交车铣加工产生颤振的条件除了与铣刀几何形状和啮合条件、机床结构的频响应函数、工件材料特性等有关外,主要与铣刀轴转速和切削深度密切相关。在正交车铣切削颤振稳定域试验过程中,切削力频谱分析的结果表明:当刀齿切入频率在力频谱中起主导作用时,切削过程是无颤振和稳定的;当系统结构模态频率在力频谱中起主导作用时,将产生颤振并测得切削力和表面粗糙度值都大于或高于无颤振情况。因此该理论模型及仿真结果可以有效预测正交车铣偏心加工颤振稳定性,为其加工表面质量和加工效率提供理论指导。

关键词: 颤振稳定性, 建模, 偏心加工, 正交车铣

Abstract: Aimed at the characteristics of variable cutting depth and thickness due to complex motion in orthogonal turn-milling, the 3D chatter theoretical model is proposed by using mathematic method based on orthogonal turn-milling principle. The chatter stability lobes of the orthogonal and eccentric turn-milling are predicted in the frequency domain using the proposed analytical solution, which the chatter condition in orthogonal turn-milling is closed relative to both cutter speed and depth of cut, besides cutter geometry, engagement conditions, frequency response function, material property of workpiece and so on. The results of spectrum analysis of cutting force in the experiment of orthogonal turn-milling chatter stability process show that the process is chatter free and stable when the spectrum is dominated by the tooth passing frequency. Chatter is occurred when the spectrum is dominated by the modal frequencies of system structure, and cutting force and surface roughness are higher in chatter conditions than in chatter free conditions. Therefore, the chatter stability of orthogonal turn-milling can be predicted by using the theoretical model and simulation results,and a theoretical guidance is provided for machined surface quality and machining efficiency.

Key words: Chatter stability, Eccentric machining, Modeling, Orthogonal turn-milling

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