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我厂切锭机床压(垫)刀板(见图1),用42CrMo钢制,热处理要求硬度HRC40～45,原热处理工艺如图2示,淬、回火均采用7m~2煤气炉,工件装盘入炉,每炉处理约150把。常规处理淬火温度较高,氧化脱碳较严重,淬火硬度不均匀。回火时由于煤气炉温差较大,致使工件硬度散差较大,常规处理机械性能见表1。由于压刀板服役时承受冲击力和弯曲力较大,工作中常出现断裂飞块,造成严重事故,且危及人身安全。后来曾采用将回火温度
I plant cutting machine pressure (pad) blade (see Figure 1), with 42CrMo steel, heat treatment requires hardness HRC40 ~ 45, the original heat treatment process shown in Figure 2, quenching and tempering are used 7m ~ 2 gas furnace, the workpiece Loading into the furnace, each furnace processing about 150. Conventional quenching temperature higher, more serious oxidation and decarbonization, quenching hardness uneven. Tempering due to large temperature difference between gas stove, resulting in larger workpiece hardness scattered, conventional mechanical properties in Table 1. As the pressure plate to withstand the impact of service and bending force, the work often appear broken fly, causing serious accidents, and endanger personal safety. Later used to tempering temperature