我厂自制ф6毫米高速钢机用铰刀,采取硝盐等温淬火,出炉空冷至室温后,立即入电炉中回火(三次),回火后再清洗。清洗后发现铰刀刃部的各刃变薄,表面有大块斑点,外圆减小0.05～0.1毫米,因磨不出来而报废。经分析后认为,主要原因是清洗工序安排不当,淬火后未及时清 Our factory made ф6 mm high-speed steel machine reamers, nitric salt isothermal quenching, baked cold air to room temperature, immediately into the furnace tempering (three times), and then cleaned after tempering. After cleaning, the edges of the reamer blade are found to be thinner with large spots on the surface. The outer circle is reduced by 0.05 to 0.1 mm, which is discarded due to wear out. After analysis, the main reason is that the cleaning process is improperly arranged and is not cleared after quenching