论文部分内容阅读
针对整体多框弱刚性件切削易变形之问题, 提出了基于切削力实时测量的进给速度实时调整方法.根据铣削变形仿真数据建立了加工过程中进给速度、切削力与工件最大变形之间的非线性数值模型, 并通过非线性求根算法求解最大变形和切削力约束下的进给速度最优解, 并在开放式数控系统中开发了相应的控制模块.利用所开发的无线轴式测力装置和控制模块开展了铝合金薄壁框切削变形控制实验, 结果说明数值模型预测精度在90％以上, 实施进给速度优化功能优化后, 切削力和工件最大变形分别降低23％和12.3％左右.实验结果表明, 经过切削力实时约束和弱刚性件加工进给速度自适应调整, 可将薄壁框件侧壁变形控制在规定范围内.“,”To improve the cutting deformation of the weak rigid multi-frame workpieces, the real-time adjustment of feedrate based on the real-time cutting force measurement is proposed. According to the milling finite element simulation, one kind of nonlinear numerical model with feed speed, cutting force and the maximum deformation of workpiece is formulated. The optimal feedrate under maximum deformation and cutting force are achieved. Meanwhile, the control module is developed in the open numerical control system. The cutting experiments of aluminum alloy thin wall frame are carried out by using the developed wireless force measuring device and control module. Experimental results show that prediction accuracy of the numerical model is over 90％. The cutting force and maximum deformation of workpiece are reduced around 23％ and 12.3％, respectively. Experimental results show that deformation of the thin-walled frames can be effectively controlled within specified range by the real-time cutting force constraint and feedrate adaptive adjustment.