我厂磨削小型汽车半轴伞齿轮(材料20crMnTi)的端面,常常出现磨削烧伤,甚至造成端面裂纹。充磁后用磁粉显示出来的裂纹形态及发生部位见图1。较粗的裂纹深约0.16mm,较细的裂纹深约0.56mm。在加工和试验过程中,我们注意到:裂纹总是在端面“靠磨”时发生,与其邻近的外圆面上,没有发生过裂纹。磨削外圆时,接触情况如图2。接触区为圆弧 I plant grinding small car semi-axis bevel gear (material 20crMnTi) end, often appear grinding burn, and even cause end face cracks. Magnesite after magnetizing the crack morphology and site of occurrence shown in Figure 1. The coarser crack is about 0.16 mm deep and the finer crack is about 0.56 mm deep. During processing and testing, we noticed that the crack always occurred when the end face was “abraded”, and no cracks were observed on the outer surface adjacent to it. Cylindrical grinding, the contact situation shown in Figure 2. Contact area is arc