大锻件内部疏松缺陷锻造压实过程FEM分析  

FEM ANALYSES ON COMPACTION OF POROSITY DEFECTS INSIDE HEAVY FORGINGS DURING HOT FORGING PROCESS

作　　者：黄华贵[1] 杜凤山[1,2] 许志强[1] 

机构地区：[1]燕山大学机械工程学院,河北秦皇岛066004 [2]燕山大学亚稳材料制备技术与科学重点实验室,河北秦皇岛066004

出　　处：《工程力学》2011年第9期245-250,共6页Engineering Mechanics

基　　金：国家自然科学基金重点项目(50435010);国家"十一五"科技支撑计划项目(2007BAF02B12);燕山大学博士基金项目(B298)

摘　　要：通过分析大型铸钢锭内部疏松缺陷的物理性质和变形特征,将疏松缺陷视为多孔可压缩材料,利用多孔可压缩材料的刚塑性有限元方法,建立了Cr5型支承辊钢锻件内部疏松缺陷锻造压实过程的非线性有限元模型。通过数值模拟,研究了上下V型砧锻造工艺下,疏松体缺陷的初始孔隙率、砧宽比、接触摩擦系数和压下量等因素对其致密压实效果的影响。在Gleeble-3500热模拟机上对具有人工制备内部疏松缺陷的圆柱体试件进行了单砧压下锻造实验,通过对疏松体变形致密过程的显微金相和密度分析,对有限元模拟结果进行了验证,两者吻合较好,为疏松缺陷压实效果预报与锻造成形工艺参数的制定提供了重要依据。The porosity defects in the heavy ingot can be treated as compressible material due to their similar physical property and deformation characteristics. Aiming at the forging process of large Cr5 typed steel backup roller, the paper established a non-linear FEA model for compacion process of porosity defects by means of the rigid-plastic finite element method for compressible material. From the numerical simulation results, the influence of the initial porousity, tool width ratio, contact friction coefficient and reduction on the defects collapse was disccussed. By preparing artificial porosity defects which sinter the deoxidized ferrous powder inside a cylinder sample, the forging experiment was carried out on the platform of Gleeble-3500. And the numerical simulation results were verified by the experiment through metallographic observation and compaction analysis of the porosity defects. The research conclusions provide a theoretical foundation for designing and optimizing the forging technology parameters .

关 键 词：疏松缺陷 多孔可压缩材料 孔隙率 锻造压实 刚塑性有限元方法 

分 类 号：TG316.192[金属学及工艺—金属压力加工]