解放牌汽车的主动螺旋伞齿轮,D_1和D_2热处理后精磨前要求变形量小于0.05毫米,但气体渗碳后降温到830℃保温1小时出炉淬油后,有一部分变形量过大校直不过来,采用火焰热点校直和加热后趁热校直效果都不好,且后者使硬度降低。重新返工,淬火变形更大,更难校直。为了挽救这些零件,我们采用3～4秒/毫米的加热速度,920℃总共加热4分钟的 Jiefangbei car’s active spiral bevel gear, D_1 and D_2 after the heat treatment required before the deformation deformation of less than 0.05 mm, but the carburizing gas cooling to 830 ℃ for 1 hour after the release of quenching oil, some deformation is too large straightening out , The use of flame hot straightening and heating hot straightening effects are not good, and the latter to make the hardness lower. Re-rework, quench deformation larger, more difficult to straighten. In order to save these parts, we use 3 ~ 4 seconds / mm heating rate, a total of 920 ° C heating 4 minutes