开式冷挤压成形深小锥孔件时极限变形程度的理论研究  

Theory Research on the Maximum Reduction of Deep Tine Taper Hole Formed by Open-die Cold Extrusion

作　　者：张双杰[1] 毛浩恩[1] 刘玉忠[1] 曾富铭[1] 李军[1] 赵军[2] 

机构地区：[1]河北科技大学材料科学与工程学院,河北石家庄050054 [2]燕山大学,河北秦皇岛066004

出　　处：《金属成形工艺》2004年第2期61-63,共3页Metal Forming Technology

基　　金：河北省自然科学基金资助项目(E2004000296)

摘　　要：　给出了深小锥孔件开式冷挤压成形时极限变形程度的定义,建立了变形区非稳态连续速度场;利用上限原理得到了极限变形程度的理论判据。分析了各主要参数对极限变形程度的影响规律,对指导制定深小锥孔件开式冷挤压成形工艺具有重要意义。In the paper, maximum reduction when deep tine taper hole is formed by open-die extrusion is defined. Through analysis of its forming characteristic, unstable continuity velocity field is established. The theoretical criterion of the maximum reduction is obtained by means of upper-bound method. Effect of main parameters on the maximum reduction is analysed. It is significant to make forming technology of deep tine taper hole formed by open-die extrusion.

关 键 词：深小锥孔 开式冷挤压 非稳态连续速度场 极限变形程度 上限法 

分 类 号：TG376.3[金属学及工艺—金属压力加工]