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我厂生产的1∶50系列9SiCr钢制销子铰刀(以下简称铰刀),原热处理工艺为:860±10℃油淬,160℃回火。技术要求为:d≤6mm的铰刀,HRC61～64;d>6mm的铰刀,HRC62～65,径跳e≤0.20mm。在多年的生产中,按上述工艺处理的铰刀,变形超差率在40%左右。由于铰刀外形比较特殊,柄短、刃带长而薄,常规的冷校直无法保证铰刀刃带的完整性,又因生产批量大,热校直受到限制,变形超差的铰刀都报
I produced 1:50 Series 9SiCr steel pin reamers (hereinafter referred to Reamer), the original heat treatment process: 860 ± 10 ℃ oil quenching, tempering at 160 ℃. Technical requirements for: d ≤ 6mm reamer, HRC61 ~ 64; d> 6mm reamer, HRC62 ~ 65, diameter jump e ≤ 0.20mm. In many years of production, according to the above process reamer, deformation rate of over 40%. Due to the special shape of the reamer, the handle is short and the blade is long and thin. The conventional cold straightening can not guarantee the integrity of the reamer edge. Due to the large production lot, the thermal straightening is limited and the reamer with excessive deformation is reported