机械

在直动滚子从动件盘形凸轮铣削加工中，为确定凸轮轮廓曲线形状，根据凸轮从动件的运动规律，通过解析法推导出凸轮理论轮廓极坐标和直角坐标公式，考虑到采用极坐标公式数控编程难以实施，选取直角坐标公式并结合数控机床刀具半径补偿功能，得到凸轮工作轮廓加工曲线。采用数控机床变量编程，编制盘形凸轮铣削宏程序，开发出参数化G功能指令，并通过数控仿真软件进行验证。结果表明，对于规律相同、尺寸和角度不同的凸轮加工，通过参数化编程，能有效减少凸轮轮廓曲线的复杂计算，快速得到正确的加工程序，提高生产效率。同时，通过该加工功能的开发，为更多不同从动件运动形式和规律的复杂凸轮加工功能开发打下基础、提供参考。

In the milling process of disc cams with straight roller followers, in order to determine the shape of the cam contour curve, the theoretical contour polar and cartesian coordinate formulas of the cam are derived through analytical methodology based on the motion law of the cam follower. Since it is difficult to implement CNC programming with the polar coordinate methodology, the theoretical contour cartesian coordinate system formula of the cam is derived by analytical methodology, and the working contour curve of cam is obtained by combining the cutter radius compensation function of NC machine tool. The variable programming of NC machine tool is used to compile the macro program of the disc cam milling, and the parameterized G function instruction is developed and verified by simulation. The result shows that the complex calculation of the cam profile curve can be reduced effectively and the correct machining program can be generated quickly for the cam with the same rule but different sizes and angles by parameterized programming, which leads to higher production efficiency. The development of this machinery function lays a foundation and provides a reference for the development of more complex cam machinery functions with different follower motion forms and laws.