锻压技术

板料渐进成形极限图测试方法研究

英文标题：Study on experimental method of measuring forming limit diagram in incremental sheet forming

作者：王进姜虎森陶龙王宝平

分类号：TG302

出版年,卷(期):页码：2013,38(2):34-36

摘要：

成形极限图是判断板料成形中是否会发生失效的重要依据。渐进成形中的板料成形极限图和传统冲压成形极限图有显著不同。板料传统冲压成形极限图测试方法已较为完善，而对于渐进成形尚没有形成统一的标准。本文在已有的测试方法基础上，提出了通过渐进成形圆弧沟槽、十字交叉圆弧沟槽直至板料端部破裂后，测量破裂位置最大和最小主应变以获得板料渐进成形极限图的新方法。通过数值模拟研究，分析了采用该方法对板料进行渐进成形时板料局部的应变状态，表明该方法可行；并使用该方法得了0.9mm厚工业纯铝1060板料的渐进成形极限图。

Forming limit diagram (FLD) is an effective method to estimate sheet crack in sheet forming. There are obviously differences between the conventional FLD and incremental sheet forming (ISF) FLD. The method of measuring the conventional FLD of sheet has been standardized. But there is inconsistent on measuring the ISF FLD until now. A new experiment method of measuring the ISF FLD was proposed. An arc groove and a cross arc groove on a sheet metal were formed to crack respectively, and major and minor strain at the crack location were measured to establish the ISF FLD. Numerical simulation was employed to learn the strain states in forming the two grooves, and the results show that the new method is feasible. Based on the method, the ISF FLD of an industrial pure aluminum 1060 with the thickness of 0.9 mm was obtained.

基金项目：

国家自然科学基金资助项目（51205217）；材料成形与模具技术国家重点实验室开放基金资助项目（2011-P07）；山东省高等学校科技计划资助项目（J10LD13）

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