新型药型罩温压扭成形模拟与实验研究  

Simulation and Experimental Study on Liner Formation Based on Warm High-pressure Torsion Technique

作　　者：李萍[1] 章凯[1] 薛克敏[1] 王晓溪[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《兵工学报》2012年第4期437-442,共6页Acta Armamentarii

基　　金：国家自然科学基金项目(50875072);安徽省优秀青年科技基金项目(10040606Y21);霍英东教育基金项目(121053)

摘　　要：高压扭转工艺可以显著提高金属粉末的固结效果,有效细化晶粒并改善组织分布的均匀性。以薄壁锥形件为研究对象,采用MSC.Marc软件对铜粉锥形件温压扭成形进行了有限元模拟及实验研究,分析了其变形行为和致密化规律。结果表明:温压扭铜粉锥形件等效应力、等效应变及相对密度的轴向分布规律相似,均是由口部到锥部递减;剪切应变为靠近模壁的区域较大;同一水平位置的相对密度总是外壁大于内壁。实验制备的铜粉锥形件相对密度达到0.960 5,与模拟结果接近;不同部位晶粒细化程度在52%～66%之间,组织分布均匀性较好;显微硬度HV0.1为70～116.实验与模拟结果具有较好的一致性,验证了有限元模型的可靠性。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 soft- ware. The rules of deformation and densification were analyzed. The results show that the axial distribu- tion 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 po- sition. 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.

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 

分 类 号：TG319[金属学及工艺—金属压力加工]