提出一种新的单颗磨粒磨削试验方法, 设计了钎焊有金刚石单颗磨粒的磨削试验装置, 并采用不同的砂轮线速度在保持单颗磨粒最大未变形切屑厚度一致的条件下进行了单颗磨粒高速磨削GH4169高温合金试验, 分析了磨屑形态、磨削沟痕及磨削力的变化规律。结果表明: 砂轮线速度对磨屑的形成和磨削沟痕表面形态有很大影响, 高速下磨屑由于剪切滑移作用呈现出锯齿状, 提高砂轮线速度可获得更好表面质量的工件; 保持速比一定的条件下, 提高砂轮线速度可以降低单颗磨粒的磨削力。

A new single grain grinding test method was proposed using a self designed device brazed single diamond grain for abrasive testing. The wear debris morpholohy, grooves and change regularity of grinding force were for analyzed in the high speed grinding test for GH4169 super alloy at different grinding speeds with the same maximum undeformed wear debris thickness. Results reveal that the grinding speed had great effects on the wear debris formation and groove surface status. Shearing and slipping caused serration segment band feature of wear debris at high speed. The increase of grinding speed can obtain workpieces with good surface. At the same ratio of grinding speed to workpiece moving speed, the grinding force of single grain decreased with increasing the grinding speed.