基于数值模拟的起落架锻模温度场、应力场分析

Temperature and stress field analysis of landing gear forging die based on numerical simulation

为解决某起落架锻模服役后出现严重塑性变形的问题,采用有限元数值模拟技术模拟实际模锻成形过程,并结合实验手段,研究锻模服役过程中的应力场、温度场分布,解决起落架锻模锻后出现的黏模、变形等问题。结果表明:有限元模拟结果与实际较吻合;锻模温度与应力随距型腔表面距离的增加而减小;最大等效应力值集中在型腔底部圆弧处,最大温度场分布在锻模桥部;锻模型腔表面及以下25 mm内区域温度波动较大,等效应力值在824 MPa以上。通过在此区域堆焊高性能焊材制备再制造锻模,能够提高锻模使用寿命。

To solve the problem of plastic deformation of landing gear forging die,the finite element model was built to simulate the forging process. Combined with experiment,the stress and temperature field distribution of die were investigated to solve the serious sticking and deformation of die after servicing. The results show that the results of finite element simulation are consistent with experimental results;the temperature and stress of forging die decrease with the distance away from the surface of mold cavity. The maximum temperature appears at bridge position of forging die,the maximum equivalent stress value appears at the bottom of cavity. The temperature fluctuates in the region of mold cavity surface and the 25 mm below surface and equivalent stress value is more than 824 MPa. The life of die can be prolonged by the surfacing welding technology in this region.