我厂在生产非标大规格滚子链时,需对直径10～60mm,长度20～100mm的轴、套类零件进行批量淬火,铁丝串扎、集束水淬(用盐浴炉加热),发现零件表面常常产生花斑型软点,软点面积达零件总表面积的1/3～1/2,严重影响了零件的淬火质量。 为解决这个问题,我们进行了分析、试验,排除了保温不足,原材料成分不均等因素。采取控制水温,降低零件加热前的表面粗糙度,改变扎法,零件 I plant in the production of non-standard large-size roller chain, the need for diameter 10 ~ 60mm, length 20 ~ 100mm shaft, sleeve parts batch quenching, wire stringing, bundling water quenching (salt bath furnace heating), found Parts of the surface often produce a spot-type soft spot, the total area of ​​the soft spot area of ​​1/3 to 1/2, seriously affecting the quality of quenching parts. In order to solve this problem, we carried out analysis and test to exclude the insufficiency of insulation and the unequal raw material composition. Take control of water temperature, reduce the surface roughness before heating parts, change the method, parts