Crack in neck of hollow shaft is a very serious malfunction, main cause of the crack include: foundry defect, centralized stress, quality problems of welding and heat treatment.

中空轴轴颈裂纹是水泥磨的严重故障。中空轴轴颈裂纹产生的原因主要有：铸造缺陷，应力集中，焊接和热处理质量问题等。

youdao

By experiment and production practice, it was pointed out that such crack could be prevented by control of pick forming, heat treatment and grinding process.

试验与生产结果表明，提高粗加工挑扣成形质量、改善热处理组织、控制磨削工艺可以有效地防止磨削裂纹的产生。

youdao

After the heat treatment process was improved on, factors inducing part to crack were decreased, the quenching of part became easy to operate and the heat treatment quality of part was ensured.

对热处理工艺改进后，减少了诱发零件开裂的因素，降低了淬火操作的难度，保证了该零件的热处理质量。

youdao