单点修整工具磨损对砂轮磨削表面的影响

Surface of Ground Workpiece Influenced by Wear of Single-Point Dressing Tool

在磨削加工过程中,砂轮表面的切削刃分布情况与磨削工件表面特征直接相关,而砂轮表面特征又与修整过程相联系,为研究单点金刚石笔的磨损和修整参数对磨削工件表面的影响,利用数值模拟和试验测量的方法揭示了砂轮修整及磨削过程,在修整重叠率为3时,讨论了修整参数与工件表面形貌特征的关系,并获得金刚石笔的磨损对磨削表面的影响.结果表明:金刚石笔初期修整阶段,磨削工件表面的峰谷分布明显具有规律性,其0.12 mm的变化周期完全为修整导程的复映;金刚石笔磨损后,工件截面曲线特征的规律性减弱,测量的表面粗糙度由0.52μm减小到0.38μm,最后导致工件表面烧伤;若调整修整导程保持原重叠率,则表面粗糙度增大为0.81μm.

The distribution of the cutting edges on the surface of grinding wheel has influence on the surface feature of ground workpiece in grinding process.Using numerical and experimental methods,the dressing and grinding processes were investigated.This approach revealed the effect of single-point diamond wear and dressing parameters on the surface morphology of ground workpiece.The influence of workpiece morphology caused by dressing parameters and wear of dressing tool was discussed under a overlap ratio of 3.It is found that a regular pattern for the valleys and peaks on the workpiece surface at a period of 0.12 mm was found in dressing feed.This regular feature is weakened as the wear of dressing tool increased and surface roughness decreased from 0.52 μm to 0.38 μm.Grinding burn occurred.However,surface roughness increased to 0.81μm through adjusting dressing parameters to keep the initial overlap ratio for the given conditions.