柴油机锻钢活塞摩擦磨损动力学分析
孙琛媛1，2，曹国帅1，2，李彬1，2，封晓晶1，2，原文涛1，2
1.滨州渤海活塞有限公司，山东 滨州 256602；2.山东省先进发动机活塞组件重点实验室(筹)，山东 滨州 256602
摘要：针对某柴油机锻钢活塞第二环岸摩擦磨损问题，在维持活塞刚性不变的约束条件下，设计不同销孔偏置方案及环岸型线方案，使用动力学分析软件仿真研究不同方案活塞第二环岸的最大摆角、敲击动能、接触压力峰值、累积磨损载荷、漏气量和柴油机机油耗。仿真结果表明：当销孔向主推力侧偏置0.5 mm并结合第二环岸中凸筒型线时，接触压力和累积磨损载荷最小，且漏气量和机油耗在设计允许范围内。经台架试验验证，该优化方案下的第二环岸磨损量约为0.027 mm，满足发动机耐久性要求。
关键词：活塞；磨损；有限元分析；动力学分析；型线；销孔偏置
Dynamic analysis of friction and wear in forged steel piston for a diesel engine
SUN Chenyuan1,2, CAO Guoshuai1,2, LI Bin1,2, FENG Xiaojing1,2, YUAN Wentao1,2
1. Binzhou Bohai Piston Co., Ltd., Binzhou 256602, China;
2. Shandong Provincial Key Laboratory of Advanced Engine Piston Components(Under Preparation), Binzhou 256602, China
Abstract: To address the friction and wear issues of the second land of a forged steel piston in a diesel engine, various pin bore offset solutions, and second land profile solutions are designed under the constraint of maintaining piston rigidity. Dynamic analysis software is used to simulate and study the maximum tilt angle, impact kinetic energy, peak contact pressure, cumulative wear load, blow-by, and oil consumption for different solutions. The simulation results indicate that a 0.5 mm pin bore offset toward the major thrust side, combined with a convex cylindrical profile for the second land, the contact pressure and cumulative wear load are minimized, while keeping blow-by gas and oil consumption within design tolerances. Bench tests verify that the wear of the second land under this optimized solution is approximately 0.027 mm, which meets the engine′s durability requirements.
Keywords: piston; wear; finite element analysis; dynamic analysis; profile; pin bore offset
