关键词: 机械制造工艺与设备, 铜粉, 高压扭转, 药型罩, 锥形件, 有限元模拟, 显微组织, 显微硬度

Abstract: High-pressure-torsion (HPT) can improve the consolidation effect of metal powder, refine the grain effectively, and homogenize the grain distribution. A thin wall cone was taken as example, and its warm HPT manufacture technology was studied experimentally and numerically by using MSC.Marc software. The rules of deformation and densification were analyzed. The results show that the axial distribution patterns of equivalent stress, strain and relative density of the formed cone are similar, And they all decrease from openning to vertex of the cone; and the shear strain is larger in the area close to die wall; the relative density in the outer wall is always higher than that in the inner wall in the same horizontal position. The relative density of the cone prepared by using warm HPT can be up to 0.960 5, and close to the simulation result. The degrees of grain refinement in different positions are from 52% to 66%, which indicate the uniformity of organization structure is better. The range of micro-hardness is from 70 to 116 HV0.1. In addition, the experiment results coincide with the simulation results better, and it shows the correctness of established finite element model.

Key words: machinofature technique and equipment, copper powder, HPT, liner, cone, FEM, microstructure, micro-hardness