摘要
用有限元方法对液压胀形的汽车桥壳进行了数值模拟,得出轴向压缩量与液体胀形压力间的合理加载路径。通过试验和模拟对比分析了第一次胀形时液体压力相对管坯轴向压缩量恒定不变、液体压力按轴向压缩量线性变化、极限失稳及胀裂的情况,揭示出起皱的主要原因是液体压力过低,起皱后不利于后续胀形,而胀裂的主要原因是液体压力过高;第二次胀形时试件退火是最终成形成功的重要影响因素。模拟结果与相同条件下的试验结果对比,最大误差5.9%。
Hydro-bulging automobile axle housings were simulated by using the finite element method. The rational relationship between the axial compression and the bulging pressure was found. During the first bulging, it was analyzed that the bulging pressure comparing with the tube axial compression was constant and linear change under the different load condition, as well as the limit unsteadiness case and fracture case. The low bulging pressure was the major reason of wrinkle, which was not good to the second bulging. The high bulging pressure will lead to fracture. During the second bulging, it was concluded that the annealing is the important factor of successful bulging. The maximum deviation between the numerical simulation and the test result was 5.9%.
出处
《制造技术与机床》
CSCD
北大核心
2009年第3期146-149,共4页
Manufacturing Technology & Machine Tool
基金
河北省自然科学基金资助项目(503299)
关键词
液压胀形
数值模拟
桥壳
Hydro-Bulging
Numerical Simulation
Axle Housings
