摘要
主阀室作为高压液动锤的核心部件,根据其结构特点与使用工况确定了主阀室的氮化处理硬度,在对比研究2种氮化方式的抗腐蚀性能后,主阀室选择了QPQ盐浴复合处理技术。但是3件主阀室试制过程中在相同位置发生断裂,根据材质检测报告与金相分析结果判定可能是加工过程中的应力集中造成的断裂。再次试制主阀室时,优化了主阀室加工工艺流程并增加去应力退火,最终在工业性试验中主阀室获得了良好的使用寿命。
The main valve chamber as the core component of high pressure hydraulic hammer,determined the nitriding hardness according to its structural characteristics and operating conditions. After compared the corrosion resistance of the two nitriding methods,the main valve chamber chose QPQ salt bath compound treatment technology. However,the three main valves were fractured at the same place during the trial-manufacture process. According to the material inspection report and the metallographic analysis result,the fracture may be caused by the stress concentration during the processing. When the main valve chamber was trial-produced again, the processing process of the main valve chamber was optimized and the stress-free annealing was increased. Finally,the main valve chamber obtained a good service life in the industrial test.
作者
李娇
赵志强
Li Jiao;Zhao Zhiqiang(Chongqing Research Institute,China Coal Technology and Engineering Group,Chongqing 400039,China;State Key Laboratory of Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400039,China)
出处
《煤矿机械》
北大核心
2020年第5期96-97,共2页
Coal Mine Machinery
基金
2017年重庆院自立重点项目(2017ZDXM11)。
关键词
应力断裂
QPQ盐浴复合处理技术
机加工工艺
stress fracture
QPQ salt bath composite treatment technology
machining process
