含内部微缺陷钢丝拉拔成型过程的有限元分析  

Finite Element Analysis of Drawing Process of Wire With Inner Micro-defects

作　　者：方峰[1] 蒋建清[1] 徐贵娥[2] 李兆霞[2] 

机构地区：[1]东南大学材料科学与工程学院,江苏南京210096 [2]东南大学工程力学系,江苏南京210096

出　　处：《钢铁》2006年第9期49-52,共4页Iron and Steel

基　　金：国家863计划(2003AA331030);江苏省科技转化资金专项(BA2004021);江苏省材料摩擦学重点试验室基金(kjsmc×04003)

摘　　要：通过对高碳盘条内部缺陷的假设，采用有限元法研究了高碳盘条拉拔过程中，工艺参数对裂纹扩展情况的影响。研究结果表明，针对1860MPa级PC钢绞线用热轧高碳盘条的拉拔生产，其最佳拉拔角约为8°。对于相同尺寸的裂纹，J积分值随着模具顶角的增大而增加；当模具顶角小于8°后，J积分值变化较小，趋于一定值；J积分值随着摩擦系数的增大而增大；芯部缺陷的临界尺寸为30～40μm。计算结果得到了试验结果的初步验证。A finite element model for drawing process of high carbon wire with inner micro-defects was built. With the model, the effect of drawing parameters on extension of defects in drawing process was studied. The results show that the optimized angle of drawing die is about 8°. J-integral increases with the increase of angle of drawing die and the friction coefficient between drawing die and wire. When the angle of drawing die is less than 8°, J integral is tended to be a constant. The critical size of inner micro-defects is 30-40 μm. The calculated results were proved by experiment.

关 键 词：1860 MPa级PC钢绞线 高碳盘条 有限元 芯部缺陷 J积分 

分 类 号：TG356[金属学及工艺—金属压力加工]