轴承材料的极限负荷P_(max)的测定通常是将试样做成轴套或轴瓦状.但是轴套或轴瓦的加工较困难,光洁度及精度不容易控制一致,同时试验机主轴的设计往往是悬臂梁式的,因此刚性较差,容易使轴承所受的载荷不均匀,造成实验数据偏差较大.为便于对轴承材料及摩擦副材料的选配研究,我们研制了MD-320端面摩擦试验机,并为适应润滑剂及添加剂试验研究需要,又设计了一套四球试验的附件. Bearing material limit load P_ (max) determination is usually made of the sample sleeve or bearing bush.But sleeve or bush processing is more difficult, smoothness and accuracy is not easy to control the same time, the test machine spindle design is often Cantilever type, so the rigidity is poor, easy to bear the load bearing uneven, resulting in large deviation of the experimental data.In order to facilitate the bearing material and friction material matching research, we developed the MD-320 end friction test Machine, and to meet the needs of lubricant and additive test research, but also designed a set of four-ball test attachment.