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本课题分四个小课题:(1)钢坯机械钻孔工艺的研究;(2)中空钢高精度轧制工艺的研究;(3)D38毫米梯形螺纹重型钎杆的研究;(4)钎钢凿岩寿命室内试验台的研究。我院参加(1)(3)两小课题,进行的工作和取得的成果如下: (1)完成了55SiMnMo钢坯合理通火工艺的研究,满足切削性能要求及保证淬火硬度,达到退火硬度保证在HRc23～28范围,钎尾淬火硬度保证在HRc50～60。自行改制了
This topic is divided into four small topics: (1) billet mechanical drilling technology research; (2) hollow steel high-precision rolling process; (3) D38 mm trapezoidal thread heavy drill rod research; (4) Research on Drilling Life Test Bench. Our hospital to participate in (1) (3) two small issues, the work done and the results obtained are as follows: (1) completed 55SiMnMo billet reasonable through process research to meet the cutting performance requirements and to ensure that the quenching hardness to achieve the annealing hardness HRc23 ~ 28 range, brazing quenching hardness assurance HRc50 ~ 60. Self-restructuring