关键词: 凸轮轴, 磨削加工, 加工速度, 速度优化, 速度调节, 自动NC编程

Abstract:

In order to improve the machining precision,surface quality and processing efficiency of a camshaft,a theoretical model of constant linear velocity grinding process of the camshaft was established according to the X-C axis linkage motion principle of grinding machine.Based on this theoretical model,a numerical calculation model of grinding speed optimization and regulation was also built by means of cubic spline fitting interpolation method.Combined with the specific camshaft part and the real parameter of the grinding process plan,the processing motion data of  the all grinding machine kinematic axises were calculated.And then the motion data were changed automatically into NC processing program of specified numerical control system under the conditions of no process faults.Thereby the automatic NC programming of camshaft grinding was realized.At last,one experiment was done on a NC high speed camshaft grinding machine,CNC8312A.In this experiment,the admission cams and the exhaust cams of Qianjiang 32F camshaft were ground separately,and the expected machining effects were also achieved.With the experimental evidence,it is shown that the methods of the grinding speed optimization and regulation and automatic NC programming are feasible whether theoretically or practically.And the methods meet the needs of the practical camshaft production well.

Key words: camshaft, grinding process, grinding speed, speed optimization, speed regulation, automatic NC programming