锻压技术

硼钢A柱补丁板热冲压工艺数值模拟与实验研究

英文标题：Numerical simulation and experimental study on hot stamping process of A-pillar patch plate for boron steel

关键词：硼钢热冲压补丁板焊点厚度减薄率

分类号：TG156.3

出版年,卷(期):页码：2020,45(5):100-104

摘要：

为解决硼钢A柱补丁板热冲压工艺中的焊点优化布置问题，采用热-力耦合的方法建立硼钢A柱补丁板的热冲压分析模型。通过对主板和补丁板间定义点焊单元，实现补丁板的热冲压工艺分析。结果表明：在成形过程中，由于补丁区域板料厚度大于其他区域，导致补丁区域温度一直高于其他区域，对该区域的有效冷却是保证零件性能的必要条件。相比于单层板的热冲压工艺，补丁板在热冲压过程中焊点周围区域是破裂的危险区域。经过焊点优化布置后，原破裂区域的减薄率由34%降低为6%，加工50件仅出现1件焊点开裂，合格率为98%。对于补丁板的热冲压工艺，需要考虑焊点的优化布置来改善焊点周围的成形缺陷。

In order to solve the problem of optimal arrangement for welding spots in hot stamping process of A-pillar patch plate for boron steel, the analysis model of hot stamping for A-pillar patch plate of boron steel was established by the thermal-mechanical coupling method, and the analysis of hot stamping process for patch plate was realized by defining the welding spot elements between main plate and patch plate. The results show that during the forming process, the thickness of plate material in patch area is larger than that of the other areas, which results in the temperature of patch area being always higher than that of the other areas, and the effective cooling of patch area is a necessary condition to ensure the performance of parts. Compared with the hot stamping process of single-layer plate, the areas around the welding spots in patch plate are easy to fracture during the hot stamping process. After the optimal arrangement of welding spots, the thinning rate of the original fracture area reduces from 34% to 6%, only one piece cracks after processing fifty pieces, and the qualified rate is 98%. For the hot stamping process of patch plate, it is necessary to consider the optimal arrangement of welding spots to reduce the forming defects around the welding spots.

基金项目：

国家科技重大专项（2018ZX04023-002）

李彦波（1970-），男，学士，正高级工程师，E-mail：liyanbo@lygf.com

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