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以残留高度不超过编程误差为前提,推导出倒凹圆/凸圆、斜面铣削时控制变量增量值的计算公式。基于轮廓铣的底面倒凹圆、斜面及顶面倒凸圆组合结构,通过求解三角形,推导得到了刀具半径补偿值、深度值、控制变量的初值与终值与控制变量之间的计算式。应用了自下而上的走刀形式及直线逼近曲线的拟合原理,实现了刀具半径补偿值的可编程参数输入功能,编制得到斜面及倒圆组合结构铣削的通用型宏程序。可以完成六种组合结构、三种常用刀具、二维轮廓外形及型腔共30种场合的铣削加工。
Based on the premise that the residual height does not exceed the programming error, the formula for calculating the incremental value of control variables during undercut / convex and bevel milling is deduced. Based on the combination of bottom concave circle, inclined plane and top inverted circle based on contour milling, the formulas of tool radius compensation value, depth value, initial value and final value of control variables and control variables are deduced by solving triangle. A fitting principle of bottom-up pass and straight-line approximation curve is applied to realize the programmable parameter input function of tool radius compensation value, and a universal macro program for milling bevel and round combination structure is prepared. Can complete the six kinds of composite structure, three kinds of commonly used tools, two-dimensional contour shape and the cavity a total of 30 kinds of occasions milling.