酸洗拉矫机减速机弧形锥齿轮失效分析及改进技术

Failure Analysis and Technical Improvement of the Bevel Gear in Tension Leveler's Transmission Reduce Box on Pickling Lines

介绍了宝钢四冷轧酸轧拉矫机弧形锥齿轮齿根疲劳断裂、齿面剥落、齿尖压渍等失效情况,在对失效齿断裂面宏观形貌、齿轮弯曲、接触强度校核、化学成分、齿轮热处理硬度、金相组织、啮合情况等做详细分析的基础上,确定弧形锥齿轮失效的主要原因,并采取提高弧形锥齿轮弯曲和接触强度安全系数、齿轮材料改善、齿轮加工齿面修形、拉矫机运行负载限制等措施,对弧形锥齿轮进行改进设计。

Failure cases, such as fatigue fracture at the tooth, case crush of the tooth face and tooth-tip squash of the bevel gear in tension leveler＇ s transmission reduce box on the pickling line of Baosteel No, 4 Cold Rolling Pickling Line are introduced. On the basis of the detailed analysis of the fracture macroscopic patterns, fillet tooth bending and contact strength check, chemical composition, gear＇ s heat treatment hardness, metallurgical microstructure, tooth engagement, etc. , the main reasons for failure of the bevel gear have been determined, and measures have been taken to raise the safety factors for bending and contact strength of the bevel gear, to improve gear＇ s materials and flank correction for gear cutting and to restrict the leveler＇s operation load. And finally, the bevel gear has been also redesigned.