粉末注射成形的离散元模拟实验研究  

Experimental Study on Discrete Element Simulation of Powder Injection Molding

作　　者：刘煜[1,2] 李益民[1] 夏卿坤[2] 何浩[1] 胡幼华[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]长沙学院机电工程系,长沙410022

出　　处：《材料工程》2014年第4期85-88,94,共5页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51075405);长沙市科技计划资助项目(K110707-11);湖南省“十二五”重点建设学科资助项目(2012)

摘　　要：建立了粉末注射成形离散元颗粒模型,将粉末离散相不再简化为连续相,而是处理为符合牛顿定律、具有相互作用的颗粒模型,用平行黏结模型近似模拟黏性液桥。将蜡基黏结剂与17-4ph不锈钢粉末经过混料和注射成型得到标准拉伸样和弯曲样注射坯,并进行了单轴拉伸和三点弯曲实验。将实验结果与离散元模拟结果对比分析,发现裂纹形态、位置和力-位移曲线具有一致性,验证了离散元颗粒模型的可靠性,校核了离散元颗粒模型的微观参数。The discrete element granular model on powder injection molding was established.Powder was treated as granular model according with Newton Law and interaction each other rather than continuous phase,and viscous liquid bridge was simulated by parallel bonding model.Wax-based binder and 17-4ph stainless steel powder were mixed and injection molded,so the standard tensile samples and bending samples were obtained.The uniaxial tension and three-point bending tests were carried on.The results of tests and discrete element simulation were compared and analyzed.The results show that the crack morphology,position,force-displacement curves are consistent.The reliability of discrete element is verified and the micro parameters of discrete element granular model are checked.

关 键 词：粉末注射成形 离散元 颗粒模型 

分 类 号：TF124.3[冶金工程—粉末冶金]