锻压技术

工具头大小对板材多点复合渐进成形过程影响的有限元分析

英文标题：FE analysis on effect of tool head size on multi-point composite incremental forming of plate

作者：蔡改贫周小磊熊洋

单位：江西理工大学

关键词：多点成形渐进成形工具头有限元

分类号：TG386

出版年,卷(期):页码：2015,40(5):11-14

摘要：

多点渐进成形具有变形均匀、可成形性强、成形效率高且能有效抑制失稳等优势。通过建立金属板材多点复合渐进成形三维有限元模型，对不同尺寸大小的工具头成形典型方锥台制件的多点复合渐进成形过程进行了数值模拟和分析，探讨了工具头大小对成形件的等效塑性应变、成形精度、厚度减薄率等的影响。通过对仿真结果的对比分析表明：工具头直径越小，制件成形区的厚度减薄越严重，越易产生破裂；工具头直径越大，制件变形越均匀、成形精度更高，但法兰区的等效塑性应变更大、越易产生起皱。

Multi-point composite incremental forming (MPCIF) has advantages of uniform deformation, high formability, high forming efficiency, effective inhibition on instability, and so on. Based on 3D finite element analysis model of MPCIF, the MPCIF process of the typical truncated pyramid-shaped work-pieces made by different size tools was simulated and analyzed, and the influences of different size tools on equivalent plastic strain, forming precision and thickness reduction ratio of deformed parts were studied. The comparative analysis of simulation results show that the smaller is tool head size, the more serious is the thickness thinning of plates that are prone to cracking easily. In contrast, the bigger is the tool head size, the more uniform is the wall thickness, and the better is the shape accuracy, however, the equivalent plastic strain is higher in flange area that is prone to producing wrinkles easily.

基金项目：

国家自然科学基金资助项目（50975131）；江西省自然科学基金资助项目（20132BAB206013）

蔡改贫（1964-），男，博士，教授周小磊(1987-)，男，硕士研究生

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