基于比磨削能的聚晶金刚石磨削机理研究

本文基于试验所测定的聚晶金刚石（PCD）比磨削能u与磨削工艺参数的关系，结合所观查的对应磨削表面微观形貌，研究了磨削机理与比磨削能的关系。结果表明：比磨削能u值小即u〈25000J／mm^3时，PCD材料磨削机理为疲劳脆性去除；比磨削能u值较大即25000J／mm^3≤u〈120000J／mm^3时，PCD材料磨削机理为随着比磨削能u值的增大，疲劳脆性去除的比例减少、机械热量除及热化学去除的比例增大；比磨削能u值很大，即us≥120000j／mm^3时，PCD材料磨削机理为机械热去除及热化学上除、基本不发生疲劳脆性去除。

Study on the grinding mechanism of PCD based on specific grinding energy

In this paper,the relationship between the specific grinding energy and grinding mechanism was analyzed based on a series of experiments.Taking account of the watched corresponding microtopography of the grinding surface.we tested the connection between the value of u(the specific grinding energy of PCD) and the parameters of grinding process,meanwhile,the experimental results show that: if u<25000J/mm~3,the grinding mechanism of PCD material is fatigue brittle removal;if 25000 J/mm~3120000J/mm~3,the grinding mechanism is mechanical thermal removal and thermal chemical removal,and the fatigue brittle removal hardly takes place.