高频电液激振冷挤压数值模拟及其减载实验研究

Cold extrusion numerical simulation and load reducing with high-frequency electro-hydraulic vibration

针对冷挤压成形过程中流动应力大、零件成形所需压力高的问题,提出了一种新的挤压工艺,设计了一种新的电液高频轴向振动激励冷挤压试验平台及相应冷挤压模具。利用Deform-3D软件建立了有限元分析模型,分析了在轴向振动激励下该模型的成形过程降载效果,精确地模拟了万向节轴套的冷挤压成形过程的挤压力的变化,比较了传统挤压形式下和轴向振动激励形式下的成形压力值,通过挤压试验验证了模型模拟的准确性。试验结果表明,该新的挤压成形工艺能使万向节杯套成形压力降低21.78%,减载效果明显。研究结果表明,这种新的成形工艺可以为一些难成形零件的冷挤压成形加工打下良好基础。

Aiming at reducing the problems of large flow stress, high parts forming pressure in cold extrusion, a new technological measures was put forward, a new axial vibration excitation test platform and die of cold extrusion was designed. Finite element analysis model was es- tablished with Deform-3d, the load shedding of model forming process was analyzed under axial vibration excitation, the forming pressure of u- niversal joint shaft sleeve was simulated accurately, the forming pressure between traditional extrusion form and axial vibration excitation form were compared, the accuracy of FEM was verified by experiment. The experimental results indicate that new extrusion measures can reduce the forming pressure of universal joint shaft sleeve by 21.78%. Through experimental research, the new forming process can lay the founda- tion for some difficulty forming parts in cold extrusion.