国外的磨削研究工作者对砂轮表面磨粒的形状变化已经进行过某些观察。苏联的曾使用显微立体照相测量方法绘制砂轮表面磨粒的等高线图。这个方法比较复杂,也不能简易地获得磨粒侧形的直观图像。德国的 Pahlitsch 用低转速圆柱形试件向砂轮送进,并使试件旋转不超过一周以避免切痕重叠,然后量出试件的表面粗糙度并称之为砂轮的有效粗糙度。这方法虽然能间接地反映砂轮表面状态,但是不能说明磨粒的实际形状。 Abroad, grinding research workers on the grinding wheel surface shape changes have been made some observations. The Soviet Union had used micrography to measure the contour of the grinding wheel surface. This method is more complicated and can not easily obtain an intuitive image of the side of the abrasive grain. Germany’s Pahlitsch uses a low-speed cylindrical specimen to feed the grinding wheel and rotates the specimen for less than a week to avoid overlap of cuts. The surface roughness of the specimen is then measured and referred to as the effective roughness of the grinding wheel. Although this method can indirectly reflect the surface condition of the grinding wheel, it can not explain the actual shape of the abrasive grain.