含缺陷钢丝多道次拉拔模拟及工艺参数优化  

MODELING OF WIRE WITH FLAW IN MULTI-DRAWING AND OPTIMIZATION OF DRAWING TECHNIQUE

作　　者：王珺[1] 陈翠[1] 李兆霞[1] 方峰[2] 蒋建清[2] 

机构地区：[1]东南大学土木工程学院,南京210096 [2]东南大学材料科学与工程学院,南京210096

出　　处：《力学与实践》2009年第1期28-33,共6页Mechanics in Engineering

基　　金：国家重点基础研究发展计划(973计划)(2007CB616903)

摘　　要：利用有限元软件ABAQUS建立了含缺陷热轧盘条多道次拉拔的分析模型,研究了道次压缩率、模具顶角和裂纹长度对拉丝安全性的影响,以减少断丝率为目标探讨道次压缩率和模具顶角的最佳配合方式.研究结果表明:模具顶角相同时,COD值和J积分值均随着裂纹尺寸的增加而增大;裂纹长度一定时,最佳入线直径随着模具顶角的增加而增大;最佳模具顶角应在4°～8°之间.Numerical model of the wire with defect in the process of multi-drawing is built based on finite element method and fracture mechanics, and the effects of parameters （draft reduction, die angle and cracking） on the wire drawing are analyzed. It is concluded that the effective method to reduce the rate of broken rods is： choose the best parameters in multi-drawing process about the draft reduction and die angle; control the length of crack by using nondestructive examination to improve the quality of the finished product. The results show that values of J-integral and COD increase with the increasing length of crack in the same die angle; the best condition diameter increases with the increasing die angle in the same length of crack; the best die angle is in the range of 4°- 8°. The above findings can be used to improve wire drawing technique and the quality of wire.

关 键 词：钢丝拉拔 缺陷 J积分 道次压缩率 模具顶角 

分 类 号：TG356.4[金属学及工艺—金属压力加工]