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采用数值模拟与物理实验相结合的方法对基于高压扭转(HPT)工艺的杯形件等温压扭复合成形进行研究,分析了等效应变场、损伤场和成形载荷。结果表明,压扭复合成形工艺改善了金属流动状态,变摩擦阻力为有益摩擦力,成形载荷由传统挤压的355t降至176t,所需扭矩8540N·m,出现最大锻件损伤值的部位在直壁顶端。进行了成形实验,所得压扭件宏观金属流线清晰可见,其微观组织不同于传统挤压件的径向纤维状而是呈弥散、均匀分布,且材料抗拉强度由挤压件的405MPa提升至431MPa。
The combination of numerical simulation and physical experiment was used to study isothermal compression-compression forming of cup based on high-pressure torsion (HPT) process. Equivalent strain field, damage field and forming load were analyzed. The results show that the compression-forming process improves the metal flow state and the frictional resistance is a useful frictional force. The forming load is reduced from 355t to 176t and the required torque is 8540N · m. The maximum forging damage occurs in the straight Wall top. The forming experiments were carried out. The macro-metal flow lines of the pressed parts were clearly visible. The microstructures of the pressed parts were different from those of the conventional extrudates but dispersed and uniformly distributed. The tensile strength of the material was increased from 405 MPa To 431MPa.