关键词: 凸轮轴, 磨削, 新工艺, 轮廓重构, 多项式

Abstract:

For a locomotive engine camshaft with concave curves,this paper proposed a novel grinding process for the locomotive camshaft after analyzing its grinding
difficulties.This process cooperated with two grinding wheels of different diameters to grind camshaft profile.In order to prevent interference on concave curves from big grinding wheel,two curve reconstructive methods using cubic polynomial and quintic polynomial were studied.The simulations of grinding motion law of the two reconstructive curve outlines were analyzed.The results obtained show that the quintic polynomial reconstructive curve profiles grinding have less demand of the tracking performance of servo system for grinding carriage and headstock,and the grinding motion curve is smoother.Finally, grinding experiments verify the validity of the simulation analysis.It shows that the concave curve grinding process based on quintic polynomial camshaft reconstruction has certain feasibility and be capable of guaranteeing both the profile precision and grinding efficiency of camshaft grinding.

Key words: camshaft, grinding, new process, profile reconstruction, polynomial