锻压技术

基于微凸台特征条件下的板料体积微触变成形实验研究

英文标题：Experimental study on micro-thixomolding in the sheet bulk forming based on micro-convex characteristics

作者：乔云于沪平张钧铭申昱

单位：上海交通大学

分类号：TG379

出版年,卷(期):页码：2019,44(4):28-34

摘要：

在已有半固态微成形研究的基础上，首次尝试将其应用于板料体积成形工艺，针对目前3C产品微细凸台难成形等问题，提出微触变板料体积成形复合工艺。通过实验研究了各工艺参数对成形微凸台高度的影响，并对工艺应用的适用性进行了探讨。研究表明，在微凸台成形过程中，影响高度因素的排序为：板厚＞下压量＞成形温度＞变形速度。板厚对成形凸台的高度有非常重要的影响，随着板厚的减小，凸台成形高度升高明显，这与宏观固态条件下的板料体积成形规律出现了背离，表现出类似尺度效应的现象，这一现象可以用圆环镦粗结合微成形摩擦尺度效应做很好的解释。在成形微凸台的过程中，外围凸包、顶部凸起以及背面缩孔等缺陷有所减少。

Based on the existing research of semi-solid micro-forming, it was attempted to apply in the sheet bulk forming process for the first time, and for the problems of difficult in the forming of micro-convex of 3C products at present, a composite process of micro-thixotropic sheet bulk forming was proposed. Then, the influences of process parameters on the height of forming micro-convex were studied through experiments, and the applicability of process application was discussed. The results show that in the forming process of micro-convex, the order of influencing height factor is: sheet thickness > pressing amount > forming temperature > deformation speed. Furthermore, the sheet thickness has a very important influence on the height of forming convex. With the decreasing of sheet thickness, the forming height of convex increases obviously, which deviates from the rule of sheet bulk forming under the macroscopic solid condition and shows similar scale effect. This phenomenon can be well explained by the friction scale effect of ring upsetting combined with micro-forming. In the process of forming micro-convex, the defects of outer convex hull, convex hull in the top and shrinkage hole in the back are reduced.

基金项目：

国家自然科学基金资助项目（51635005）

乔云（1992-），男，硕士研究生 E-mail：cloud_sj@sjtu.edu.cn 通讯作者：于沪平（1963-），男，博士，副教授 E-mail：yuhp@sjtu.edu.cn

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