Generalized Mechanics and Dynamics of Modulated Turning
Generalized Mechanics and Dynamics of Modulated Turning
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DOI：
10.1016/j.jmatprotec.2022.117708
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发表时间：
2022-07
影响因子：
6.3
通讯作者：
Bora Eren;Soohyun Nam;B. Sencer
中科院分区：
文献类型：
--
作者：
Bora Eren;Soohyun Nam;B. Sencer
本文提出了一种广义切削力和再生颤振稳定性预测调制车削（MT）过程。未切削的芯片厚度建模考虑当前的工具运动学和起伏（以前产生的）表面形貌为任何给定的调制条件在进给方向。据发现，芯片的形成是受过去的主轴旋转多个产生的起伏表面。未切削切屑厚度的三角函数的形式解析计算，切削力的预测，利用正交切削力学。再生颤振稳定性的过程中也建模。基于解析半离散化的解决方案被开发用于精确地预测MT过程的稳定性瓣图（SLD）。通过数值时域模拟和正交（切入）车削试验验证预测的稳定性波瓣。发现与传统的单点连续车削相比，MT的再生稳定性表现出多个（3）再生延迟回路，并且在刀具接合之间的长的非切削持续时间使工艺稳定，以达到与传统的连续车削相比高达2倍的稳定宽度/深度。
This paper presents a generalized cutting force and regenerative chatter stability prediction for the modulated turning (MT) process. Uncut chip thickness is modeled by considering current tool kinematics and undulated (previously generated) surface topography for any given modulation condition in the feed direction. It is found that chip formation is governed by the undulated surface generated in multiple past spindle rotations. Uncut chip thickness is computed analytically in the form of trigonometric functions, and cutting forces are predicted by making use of orthogonal cutting mechanics. Regenerative chatter stability of the process is also modelled. Analytical semi-discretization-based solution is developed to accurately predict the stability lobe diagrams (SLDs) of the MT process. Predicted stability lobes are validated through numerical time-domain simulations and experimentally via orthogonal (plunge) turning tests. It is found that as compared to conventional single-point continuous turning, regenerative stability of MT exhibits multiple (3) regenerative delay loops and long out-of-cut duration in-between tool engagement stabilizes the process to reach up to 2x higher stable widths/depths as compared to the conventional continuous turning.