通过整合相对熵和动态切削力,建立基于模拟的颤振预测系统

IF 2.9 3区 工程技术 Q2 AUTOMATION & CONTROL SYSTEMS
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引用次数: 0

摘要

摘要 本文旨在利用相对熵-库尔巴克-莱伯勒发散(KLD)开发一种基于仿真的颤振预测系统,并可修改数控程序使其不发生颤振。在数控机床上加工机械部件时,颤振是主要问题之一。一般来说,以往的大多数研究方法都是根据生成的 SLD(稳定叶图)分配适当的加工参数:(1) 主轴转速、(2) 进给速度和 (3) 切削深度,从而实现无颤振稳定加工。一旦在加工过程中检测到颤振,也可通过手动调整操作面板上的主轴超控百分比或通过联网调整 CNC 控制器中的值来实现无颤振稳定加工。创建 SLD 必须考虑两个基本参数:切削力系数 (CFC) 和频率响应函数 (FRF)。切削力系数可从与成对刀具和工件相关的切削实验数据中获得,而频率响应函数可从攻丝测试实验中计算得出。然后,将 CFCs 和 FRF 储存在所开发系统的数据库中。基于仿真的颤振预测根据动态切削力和静态切削力的相对性计算 KLD 值,从而预测 NC 程序是否存在颤振。如果预测出存在颤振,则可以调整数控程序,使其不产生颤振。所提出的方法已在现场加工中得到成功验证,显示出非常好的效果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On a simulation-based chatter prediction system by integrating relative entropy and dynamic cutting force

Abstract

This paper aims to develop a simulation-based chatter prediction system using relative entropy—Kullback-Leibler divergence (KLD), and the NC program can be modified to become non-chatter. Chatter is one of the major concerns when machining mechanical components on a CNC machine. In general, the majority of the previous research methods achieved non-chatter stable machining by assigning the appropriate machining parameters: (1) spindle speed, (2) feed rate, and (3) depth of cut based on the generated SLD (stability lobe diagram). Non-chatter stable machining can also be accomplished by manually adjusting the spindle override percentage on the operation panel or the values in the CNC controller via networking once chatter is detected during the machining processes. The creation of SLD must consider two essential parameters: cutting force coefficients (CFCs) and frequency response function (FRF). The CFCs can be obtained from cutting experiment data related to a paired tool and workpiece, and the FRF can be calculated from the tapping test experiment. Then, the CFCs and FRF are stored in the database of the developed system. The simulation-based chatter prediction calculates the KLD value based on the relativity of the dynamic cutting force and the static cutting forces so as to predict whether there is chatter in the NC program or not. The NC program can be adjusted to become non-chatter if there is chatter predicted. The proposed method has been successfully verified through on-site machining, showing very promising achievement.

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来源期刊
CiteScore
5.70
自引率
17.60%
发文量
2008
审稿时长
62 days
期刊介绍: The International Journal of Advanced Manufacturing Technology bridges the gap between pure research journals and the more practical publications on advanced manufacturing and systems. It therefore provides an outstanding forum for papers covering applications-based research topics relevant to manufacturing processes, machines and process integration.
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