基于有限元数值模型和进给速度优化的薄壁件侧铣变形在线控制  

FEM Numerical Model and Feedrate Optimization Based On-line Deflection Control of Thin-walled Parts in Flank Milling

作　　者：韩振宇[1] 金鸿宇 付云忠[1] 富宏亚[1] 

机构地区：[1]哈尔滨工业大学机电工程学院,哈尔滨150006

出　　处：《机械工程学报》2017年第21期190-199,共10页Journal of Mechanical Engineering

基　　金：国家科技重大专项(2010ZX04001-031);黑龙江省自然科学基金(E2016068)资助项目

摘　　要：为实现在加工过程中对薄壁件侧铣产生的较大切削变形进行在线控制,提出基于有限元数值模型和进给速度优化的在线控制策略。根据薄壁件切削过程的有限元仿真结果,建立数控机床进给速度、切削力、工件切削变形间的数值模型,进而确定用于控制变形的最优目标切削力。在具有开放式模块化的数控系统平台上开发了切削力信号实时采集、滤波功能和基于Brent-Dekker算法的进给速度在线优化策略,并根据滤波后的切削力及相应算法在加工过程中实时调整机床进给速度,保证切削力逐渐接近最优控制目标而实现切削变形的在线控制。试验结果表明,经过进给速度在线优化后的切削过程可将薄壁件侧铣变形控制在规定范围内,同时提高了切削效率。To effectively realize on-line control of the cutting deflection of thin-walled parts in side milling, a control strategy based on numerical model with finite element method（FEM） and feedrate optimization is proposed. According to the FE simulation results of cutting process, the numerical model among feedrate of machine tool, cutting force, and workpiece deflection is established, and the optimal control target of cutting force is determined. The function of force signal real-time filtering and the strategy of on-line feedrate optimization which based on Brent-Dekker are developed in the open modular architecture CNC system, and feedrate in the machining process could be adjusted to ensure optimum control of cutting force and on-line control of machining deflection through the filtered cutting force and corresponding optimization algorithm. Experimental results show that flank milling deflection of thin-walled workpiece could be maintained within a specified range in the machining process through on-line feedrate optimization, and cutting efficiency is improved.

关 键 词：切削变形 在线控制 开放式模块化数控系统 进给速度在线优化 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]