机匣体多向模锻的热力耦合数值模拟

机匣体是枪械上的一个关键零件,其质量对枪械的整体性能有着非常重要的影响.机匣体的材料为LC4超硬铝合金,该合金的塑性差,变形流动阻力大,且具有速度敏感性.对机匣体锻件的结构特点及相对尺寸关系进行了分析,指出多向模锻是成形该锻件的优选工艺方案.制定了多向模锻工艺方案,设计了辊锻毛坯和多向模锻模具,并采用DEFORM-3D对终锻成形过程进行了数值模拟,分析了变形过程及温度场的变化规律.根据模拟结果进行了工艺试验,最后得到了合格的样件.证明了采用该工艺方案可以很好地保证成形温度,提高材料塑性,解决其成形困难的问题,同时也证明数值模拟的正确性.

Thermal-force coupled simulation for multi-way die forging of case

The case is a key part of the shooter,whose quality has a very important effect on the shooter's integrated performance.The case material is super-hard Al-alloy LC4,which has a bad plastic property,great flow resistance and velocity sensitivity.The design feature and correlation size relation of the case forging was analyzed and multi-way die forging process was decided.Blank shape and multi-way forging dies were designed.The final forging process was simulated by DEFORM-3D program and the variation of temperature field of the billet during forming was analyzed.According to the simulation result,the experiment was taken and qualified forging was obtained.The results prove that the employed process can efficiently ensure the forming temperature,increase plasticity and solve the forming difficulty of the material. The correctness of FEM simulation is also affirmed.