摘要
某型航空液压柱塞泵在使用过程出现磨损,分解检查其原因是柱塞泵壳体内部活门处卡圈断裂。采用扫描电镜对卡圈断口进行微观形貌分析,发现断口有明显的疲劳条带特征;根据活门处的结构形式分析验证了卡圈在活门开启过程的受力与运动情况,分析说明随着回油压力由小增大,活门座会先向下微小运动,然后活门打开,这也是卡圈微动的原因。模拟卡圈微动冲击情况,得出活门卸荷后关闭瞬间,卡圈受到撞击力,撞击过程卡圈最大应力位置与卡圈实际断裂位置相一致。根据卡圈疲劳机理分析制定改进措施为产品修理提供参考。
A type of aero-hydraulic plunger pump has been wearing away during service process,the circlip of plunger pump shell was broken at valve by overhaul.It was found that the fracture had obvious fatigue band characteristics when using scanning electron microscopy(SEM)to analyze the fracture morphology of the circlip.According to the structural form of valve,analysis the force and movement of the collar during the opening process of the valve were verified.Analysis results show that as the return pressure of oil increases from small,and the valve seat will move slightly downwards first,and then the valve opens,which is also the reason for the micro-motion of the circlip.The simulated of circlip micro-acting shock obtain that the moment of closing after the unloading of the valve,the circlip is subjected to the impact force,the maximum stress position in impact process is consistent with the actual fracture position of the circlip.According to the analysis of the fatigue mechanism of the circlip,the improvement measures formulated can do certain reference value to the product repair.
作者
张峰
孙同明
管博文
李永龙
ZHANG Feng;SUN Tong-ming;GUAN Bo-wen;LI Yong-long(Notional Machinery Factory in Wuhu, Wuhu, Anhui 241007)
出处
《液压与气动》
北大核心
2020年第5期173-178,共6页
Chinese Hydraulics & Pneumatics
关键词
卡圈
微动疲劳
断裂分析
微动冲击
circlip
fretting fatigue
fracture analysis
fretting impact
作者简介
张峰(1989—),男,安徽灵璧人,工程师,硕士,主要从事航空液压泵修理技术研究工作。
