锻压技术

拉延模具表面激光微织构对成形性能的影响

英文标题：Influence of laser micro-texture on formability for drawing die surface

作者：戴金跃张航成

分类号：TH16；TG176；TG331

出版年,卷(期):页码：2018,43(11):114-119

摘要：

为研究模具表面微织构对成形性能的影响，采用ABAQUS有限元软件建立杯突球头表面不同类型微织构的有限元模型，分析微织构对板料应力、应变以及材料流动的影响，利用激光微织构技术在球头表面加工微凸起和微凹坑织构，开展拉延成形试验。结果表明，相较于未加工表面织构的模具，微凸起织构使对应区域的材料流出量降低了1.7%，微凹坑织构使对应区域材料流出量增加了7.0%。微凸起织构能够细化材料表层晶粒，使板料表面的微观不平整度降低。在拉延成形过程中，微凹坑织构可以促进材料流动；而微凸起织构会阻碍材料流动，微凸起织构在成形过程中会钉扎板料表面，细化材料表层晶粒，凸起形状会完全复印到板料表面。

In order to study the influence of micro-texture on formability for die surface, the finite element models of different types of micro-texture on the surface of cup head were established by finite element software ABAQUS, and the influences of micro-texture on the stress, strain and material flow were analyzed. Then, the micro-convex and micro-concave textures were processed on the surface of ball head by laser micro-texture, and the drawing test was carried out. The results show that comparing with the original die surface, the micro-convex texture reduces the material outflow 1.7% in the corresponding region, while the micro-concave increases the material outflow 7% in the corresponding region. Therefore, the micro-convex texture refines the surface grain of material to reduce the micro unevenness of the sheet surface, and the micro-concave texture promots the material flow during the drawing process. Furthermore, the micro-convex texture impedes the material flow and nails to the sheet surface to refine the surface grain of material during the forming process, and the convex shape is completely copied to the sheet surface.

基金项目：

镇江市科技支撑（工业）项目资助（GY2014044）

戴金跃（1972-），男，硕士，副教授,E-mail：593016524@qq.com

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