A study on the grinding mechanism by the Apparatus to quickly separate the work from the wheel

本文采用扫描电镜对磨削试验中因冲击而突然分离的砂轮与工件接触面进行了观察和测量。得到了以下结果：钢的磨削机构。(1)通过对接触区域划痕的观察和测量，得到了有效切削刃间距和截面积的实际值。(2)许多实际切削晶粒具有两个或多个切削刃。(3)观察到许多切削变形的膨胀流，它们在估计切屑截面积和晶粒切割深度的值时是不可忽略的。陶瓷的磨削机理。(1)切向磨削力与法向磨削力之比不变，但陶瓷种类和进给速度不同。陶瓷的晶粒尺寸越小，该比值越大。(2)塑性变形面积与断裂面积之比在很大程度上取决于晶粒尺寸和陶瓷材料的种类。磨削力也会受到影响。(3)塑性流区的磨削比应力与陶瓷材料的屈服应力有关。

In this study many contact surfaces between wheel and work that were suddenly separated by the impact in the grinding test were observed and measured by SEM. And following results were Obtained.1. Grinding mechanisms of the steel.(1)From the observation and measurement of the scratches on the contact area, the actual value of the interval of the effective cutting edges and the cross sectional areas were obtained.(2)Many actual cutting grains have two or more cutting edges.(3)Many swelled flows of the cutting deformation were observed and they are not negligible on the estimation of the values of the sectional areas of the chips and the depth of grain cut.2. Grinding mechanisms of the ceramics.(1)The ratio of the tangential grinding force to normal grinding force is constant nevertheless the kind of ceramics and the feed rate vary. And the ratio is large as the grain size of ceramic is small.(2)The ratio of the plastically deformed area to the fractured area is largely depend on the grain size and the kinds of ceramic material. And the grinding forces are effected too.(3)The specific grinding stress on the plastic flow area is related to the yield stress of the ceramics material.