欠弯曲形成机理及临界凹模肩宽研究  

Mechanism of reversed bending and critical width of die

作　　者：金淼[1] 邹宗园[1] 郭宝峰[1] 赵文成 李硕本[1] 

机构地区：[1]燕山大学机械工程学院,河北秦皇岛066004 [2]中冶京唐(唐山)精密锻造有限公司,河北唐山063020

出　　处：《材料科学与工艺》2013年第1期97-102,共6页Materials Science and Technology

基　　金：国家自然科学基金资助项目(50475080)

摘　　要：为揭示欠弯曲的发生机理,探求其发生的临界条件,采用数值模拟、理论分析与实验研究相结合的方法,对板材的V形弯曲过程进行了深入探讨.提出板材与凹模接触处因接触应力过大而导致发生局部塑性变形是欠弯曲发生的根本原因,并进一步提出了临界凹模肩宽判据,结合弹塑性弯曲及接触力学理论,建立了临界肩宽的理论分析模型,设计了相应的弯曲实验装置,并进行相关实验研究.实测数据与本文给出的理论模型计算结果吻合较好,表明本文所建立的计算模型在弯曲变形满足平截面假设时具有较高的计算精度.To reveal the mechanism of reversed bending and study the critical condition of reversed bending,this paper applied numerical simulation,theory analysis and experiment to study the process of V-bending,and proposed that the excessive contact stress between sheet and dies induced the local plastic deformation which was the fundamental reason of reversed bending.Then the critical width of die to avoid reversed bending was defined.The theoretical analysis model for critical width of die was founded based on elastic-plastic bending theory and contact mechanics.Bending experiment device was designed and bending experiment was carried out.The consistency of the experimental results and the theoretical results is relatively well,so it indicates that the calculation model provided in the paper owns high accuracy when the assumption of plane cross-section is satisfied during the bending.

关 键 词：板材成形 V形弯曲 欠弯曲 临界凹模肩宽 

分 类 号：TG386.3[金属学及工艺—金属压力加工]