锻压技术

工艺参数对钢-铝板材自冲铆接接头成形和性能的影响

英文标题：Influence of process parameters on forming and performance for steel-aluminum sheet self-piercing riveted joints

分类号：TG938

出版年,卷(期):页码：2023,48(12):48-56

摘要：

使用HC340/590DP先进高强度钢和AlSi10MnMg-T7铸铝材料组合制备自冲铆接接头，研究了不同类型铆钉的长度、硬度对钢铝异种材料铆接成形接头的机械响应。结果表明，定义的参数对铆接质量和力学响应有明显影响。在上层钢板厚度较小或铆钉硬度为H5的组合状态下，接头的失效模式为下层板脱出；在铆钉硬度为H6组合状态下，接头的失效模式多为铆钉断裂。结合失效模式以及力学性能发现，铆钉断裂会明显降低能量吸收水平；使用6.0 mm长度的铆钉接头的失效载荷均在7.3 kN以上，随着铆钉长度的增加，作用在板材间的钉身面积增大，单位载荷不变的情况下失效载荷呈现增大的趋势。接头组合底层铝板较厚或铆钉硬度为H5时，能量吸收性能表现突出，且能量吸收水平随板厚的增加而提高。

Self-piercing riveted joints were prepared by using a combination of HC340/590DP advanced high-strength steel and AlSi10MnMg-T7 cast aluminum material, and the mechanical response of different types of rivet lengths and hardnesses to the riveted joints formed by steel-aluminum dissimilar materials was investigated. The results show that the defined parameters have a significant impact on the riveting quality and mechanical response. Under the combination state that the upper steel plate thickness is smaller or the rivet hardness is H5, the failure mode of joint is that the lower plate comes out, and under the combination state that the rivet hardness is H6, the failure mode of joint is mostly the rivet breakage. Combining with the failure mode and mechanical properties, it is found that rivet fracture significantly reduces the level of energy absorption, and the failure loads of joints using the rivet with the length of 6.0 mm are above 7.3 kN. As the length of rivet increases, the nail body area acting between plates increases, and when the unit load remains unchanged, the failure load shows an increasing trend. When the underlying aluminum plate of joint combination is thicker or the rivet hardness is H5, the energy absorption performance is outstanding, and the level of energy absorption increases with the increase of plate thickness.

基金项目：

中央引导地方项目(桂科ZY21195006)；广东省重点领域研发计划项目(2022B0909070001)；高性能铝合金超轻量化材料及汽车总成产品的研发与产业化示范项目（桂科AB23026104）

作者简介：罗国健（1996-），男，硕士研究生 E-mail：1872558980@qq.com 通信作者：顾成波（1986-），男，硕士，高级工程师 E-mail：gu_chengbo@126.com

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