基于加工刀位直接插补的机床坐标逆向计算方法  

Inverse calculation method of machine coordinates based on machining cutter location direct interpolation

作　　者：李慧莹[1] 陈良骥[1] 张海军[2] 

机构地区：[1]天津工业大学,天津300387 [2]郑州航空工业管理学院,郑州450015

出　　处：《现代制造工程》2016年第10期41-46,共6页Modern Manufacturing Engineering

基　　金：国家自然科学基金项目(51275485);河南省高校科技创新人才项目(13HASTIT036)

摘　　要：针对五轴数控加工中G01插补指令存在非线性刀具摆动误差的问题,提出了一种基于五轴加工刀位直接生成的五轴G01插补控制方法,同时以双转台类型的五轴数控机床为例,建立了由参考坐标系到工件坐标系之间的中间坐标系,基于对各坐标系运动情况的分析,最终得到了由参考坐标系到工件坐标系的坐标变换矩阵。具体插补控制时,将上述插补计算出的刀位逆向计算出机床坐标,从而实现对机床运行的G01轨迹的控制,可有效降低五轴数控机床的非线性误差。Aiming at the problem of nonlinear error of tool-tip track caused by cutter rotating in 5-axis Computer Numerically Con- trolled （CNC） machining, the 5-axis interpolating controlling new method for G01 code is proposed based on cutter location direct generation. At the same time, a work-table rotating and tilting type of 5-axis CNC machine tool is listed as an example for motion analyzing. The middle coordination systems are established from reference to work-piece, then the coordination systems which are intervenient from reference coordination system to work-piece coordination one are established and coordinate transformation matrix are finally obtained based on motion analysis of the coordination systems. While interpolating controlling, the former results of cutter location are used to calculate the machine tool coordinates and realize the G01 controlling. The method is efficient for lower nonlinear error of 5-axis CNC machine tools.

关 键 词：数控 五轴加工 G01指令 逆向坐标变换 

分 类 号：TG659[金属学及工艺—金属切削加工及机床]