软固结气压砂轮磨粒磨损研究

Research of soft consolidation pneumatic wheel abrasive wear

为解决自由曲面高效光整加工的问题,将软固结气压砂轮光整技术应用到模具加工中。软固结磨粒群在磨削时能受到柔性支撑,其磨削特性既不同于砂带,也不同于游离磨粒,然而气压砂轮有效加工的时间很短,磨损情况较为严重。针对这一情况,开展了软固结磨粒群磨粒的磨损过程及磨损机理分析,通过实验分别对气压砂轮自转速度ω、气压砂轮下压量d以及磨粒种类等与气压砂轮磨粒磨损之间的关系进行了研究和评价,并对不同种类磨粒的磨损表面进行了观测。研究结果表明:软固结磨粒磨损可以分为初期磨损阶段、正常磨损阶段和严重磨损阶段;磨粒的磨损随着气压砂轮自转速度ω和下压量d的增大而变得严重,但是当气压砂轮自转速度ω增加到某一定的值时,磨粒的磨损反而会下降。

In order to solve the problems of the efficient finishing processing on the free surface of moulds,the finishing technology with the soft consolidation abrasives pneumatic wheel was investigated.Soft consolidation abrasive can be supported by flexible when grinding,it is different from abrasive belt and the free abrasive.However,the effective processing time of pneumatic wheel is very short; the wear situation is more serious.Aiming at solving this problem,abrasive wear process and grinding mechanism of soft consolidation pneumatic wheel were discussed; the relationship between the influence and the rotation speed ω,the amount of press down d and the types of abrasive wear was established,and the surface forms of different kinds of abrasive wear was observed.The influencing factors of abrasive wear were evaluated on experiments.The results indicate that the soft consolidation of abrasive wear can be divided into the initial wear stage,the normal wear stage and the severe wear stage.Abrasive wear with the increase of grinding wheel rotation speed ω and the amount of press down d becomes serious,but when grinding wheel rotation speed ω is increased to a certain value,the abrasive wear may decline.