SiC晶须强化树脂的磨损特性及其在磨削加工中的应用

WEAR CHARACTERISTICS OF SiC WHISKER REINFORCED PLASTIC AND ITS APPLICATION IN GRINDING

本文使用SiC晶须 (细纤维 )与酚醛树脂混合 ,经特殊工艺处理后制成了几种不同晶须含量、排列方向及粉末添加剂的SiC晶须强化树脂。通过对接触材料 (模具钢SKD11,HRC60 )所进行的磨损特性试验可知 ,当SiC晶须强化树脂中晶须的含量增高及排列方向与接触材料的摩擦面相垂直时 ,其磨损量将小于接触材料的磨损量 ,这表明SiC晶须材料具有磨料的作用。本文利用这一作用将SiC晶须强化树脂制成杯形砂轮 ,并应用到模具钢SKD11的磨削加工中 ,能获得高达 60 0 0的磨削比和纳米级的加工表面 (Ra1 5nm/Ry16nm) ,进一步表明SiC晶须作为磨料是可行的。

In this paper, SiC whisker reinforced plastic composites composed of SiC whiskers and a phenol resin bond with or without additives were developed, in which whiskers have different contents and orientations. A large number of abrading experiments on a contact material such as die-steel SKD11 (HRC60) were carried out. The experimental results illustrated that the wear volume of SiC whisker reinforced plastic will be smaller than that of the contact material as whisker content gets higher and whisker orientation is normal to the abrading surface of the contact material. That means SiC whiskers can play an abrasive action. As a result, a cup-shaped SiC whisker grinding wheel was developed by using SiC whisker reinforced plastics and the wheel was applied to grind die-steel SKD11. A very high grinding ratio of 6000 and a very finish surface of Ra1.5nm and Ry16nm was achieved. The investigations further show that SiC whisker as an abrasive malerial is feasible and practicable.