12.9级缸盖螺栓的延迟断裂分析  

Factor analysis of delayed fracture of 12.9 class bolts in cylinder head

作　　者：李建平[1] 黄文长[1] 冯继军[1] 卢海波[1] 

机构地区：[1]东风汽车公司工艺研究所

出　　处：《汽车科技》2001年第4期16-18,共3页Auto Sci-Tech

摘　　要：两件 12.9级气缸盖螺栓发生延迟性断裂，根据螺栓的失效形式，结合螺栓的生产及装配工艺，分析了导致螺栓发生延迟断裂的影响因素，探讨了材料方框偏析对高强度螺栓可能产生的影响，提出了防止高强度螺栓发生延迟断裂的措施。Delayed fracture of two class 12.9 bolts in cylinder head are found.The factors led to delayed failure are analyzed by combined the manufacturing and assembly processes.The possible effect of the frame－like segregation on the properties of high strength bolts is discussed and some measures to prevent the bolts from delayed fracture are presented.

关 键 词：高强度螺栓 延迟断裂 装配 方框偏析 汽车 发动机 缸盖螺栓 

分 类 号：U464.13[机械工程—车辆工程]