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基于运动学的高速高精密铣削力建模:综合模型与试验

李刚1,张宇2,李斯3,朱锟鹏4   

  1. 1. 常州先进制造技术研究所
    2. 中国科学技术大学
    3. 武汉科技大学
    4. 中国科学院 合肥物质科学研究院先进制造技术研究所
  • 收稿日期:2022-04-08 修回日期:2022-06-21 出版日期:2022-09-22 发布日期:2022-09-22
  • 通讯作者: 李刚
  • 基金资助:
    国家重点研发计划资助项目

Modeling of high speed milling forces based on kinematics: comprehensive modeling and experimental study

  • Received:2022-04-08 Revised:2022-06-21 Online:2022-09-22 Published:2022-09-22

摘要: 摘要:铣削加工过程中,铣削力是其中一个非常重要的过程参量,铣削力信息的准确反馈对保证加工过程中的稳定性具有重要意义。然而影响铣削力大小的因素有很多种,目前缺乏一种考虑多种因素下的综合铣削力模型。因此,本文着重研究并综合考虑了刀具磨损、刀具跳动、刀具弹性变形对瞬时切削厚度的影响,同时分析了弹性变形对刀具切入、切出角的影响规律,改进了刀具瞬时切削厚度模型。基于运动学分析,将切削刃位置与预加工工件形态相互统一,建立了综合铣削力模型。为验证所提出综合模型的精确性和通用性,进行铣削实验,实验结果表明,铣削力预测值与实验值吻合较好,铣削力误差值小于1%,并通过分析刀具磨损与铣削力之间的相互变化关系,得出进给方向上的铣削力与Z向的铣削力系数对刀具磨损的影响最大,因此切向力分量以及Z向的铣削力系数的变化特征可以良好的表征刀具磨损状况,从而提高铣削加工精度和效率。

关键词: 关键词:综合铣削力模型, 刀具跳动, 刀具磨损, 弹性变形

Abstract: Abstract:The milling force is one of the most important process parameters in milling process. Accurate feedback of milling force information is very important to ensure the stability and precision of milling process. However, there are many factors that affect the milling force, and there is currently a lack of a comprehensive milling force model that consid-ers multiple factors. Therefore, this article focuses on research and comprehensively considers the influence of tool wear, tool run-out, and tool elastic deformation on the instantaneous undeformed cutting thickness. At the same time, it analyzes the relationship between elastic deformation and variety of entry and exit angles for each engaged flute, and the instanta-neous cutting thickness model is improved. Based on kinematic analysis, the position of cutting edge is unified with the shape of premachined workpiece, and a comprehensive model of high speed milling force is established. In order to verify the accuracy and generality of the proposed model, a series of milling experiments under different parameters are carried out. The experimental results show that the predicted value of milling force is in good agreement with the experimental value, and the error value of milling force is less than 1%. By analyzing the relationship between tool wear per tooth and milling force, it is concluded that the milling force in the feed direction has the greatest impact on tool wear. Therefore, the radial force component can well characterize the tool wear, so as to improve the milling accuracy and efficiency.

Key words: Key words:comprehensive model, tool run-out, tool wear, elastic deformation