张山寅,邓勃然,胡寓婷,等.DP980超高强钢与AA5052铝合金薄板预成形无铆连接实验研究[J].精密成形工程,2025,17(1):97-106.
ZHANG Shanyin,DENG Boran,HU Yuting,et al.Experiment Study of Clinching Joint Process with Pre-forming between DP980 Ultra-high Strength Steel and AA5052 Aluminum Alloy Sheet[J].Journal of Netshape Forming Engineering,2025,17(1):97-106. |
| DP980超高强钢与AA5052铝合金薄板预成形无铆连接实验研究 |
| Experiment Study of Clinching Joint Process with Pre-forming between DP980 Ultra-high Strength Steel and AA5052 Aluminum Alloy Sheet |
| 投稿时间：2024-05-15 |
| DOI：10.3969/j.issn.1674-6457.2025.01.012 |
| 中文关键词: 预成形 无铆连接 DP980超高强钢 AA5052铝合金 压台凸模 |
| 英文关键词: pre-forming clinching joint DP980 ultra-high strength steel AA5052 aluminum alloy punch with pressure step |
| 基金项目:中央引导地方科技发展资金(226Z1809G) |
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| 中文摘要: |
| 目的 研究预成形无铆连接相关工艺参数对超高强钢与铝合金薄板接头形貌的影响及连接效果。方法 采用预成形无铆连接方法，对钢板进行预成形，解决铆接过程中因变形抗力太大导致的接头断裂或互锁量不足问题，同时，提出带有压台结构的铆接凸模，以防止铝合金材料外溢，压实接头，进一步提高铆接质量。选取DP780高强钢、DP980超高强钢和AA5052铝合金薄板为研究对象，以预成形深度、凹模深度以及凸模压台高度为变量，通过各种组合方法进行无铆连接实验，对比分析各工艺参数对DP780/AA5052和DP980/AA5052接头形貌的影响规律，最后采用剪切和剥离强度实验，评价DP980/AA5052预成形无铆连接的可行性与效果。结论 接头检测结果表明，随着预成形深度和凹模深度的增大以及压台高度的减小，接头互锁量增大，其中预成形深度影响较大;随着预成形深度和压台高度的减小以及凹模深度的增大，接头颈厚略有增加，其中凹模深度影响较大。由剪切和剥离实验可知，进行剪切实验时，DP780/AA5052接头出现剥离和剪切失效，DP980/AA5052接头皆为剥离失效;进行剥离实验时，2种板材接头都为铝板撕裂失效;对比两者接头剪切强度得到DP980/AA5052接头连接强度高于DP780/AA5052接头的连接强度，验证了超高强钢与铝合金薄板预成形无铆连接的可行性。 |
| 英文摘要: |
| The work aims to investigate the effect of pre-formed clinching joint process parameters on the joint appearances and connection effect of ultra-high-strength steel and aluminum alloy sheets. Preformed clinching joint method was used to pre-form the steel sheet, reducing the problems of joint fracture or insufficient interlock due to excessive deformation resistance during clinching process. Meanwhile, a clinching punch with a pressure step structure was proposed to prevent aluminum alloy material from overflowing, further improving the clinching quality of the joint and compacting the joint. DP780 high strength steel, DP980 ultra-high strength steel, and AA5052 aluminum alloy sheet were selected as the research objects. The process parameters such as pre-forming depth, die depth, and punch pressure step height were taken as variables. Clinching joint experiments were conducted with various combinations of variables to analyze the effect of process parameters on the joint appearances of DP780/AA5052 and DP980/AA5052. Finally, shear and peel strength experiments were conducted to evaluate the feasibility and effectiveness of pre-formed clinching joint of DP980/AA5052. Through microscopic inspection of the joints, it is found that with the increase of pre-forming depth and die depth, and the decrease of pressure step height, the interlock amount of the joint increases, with pre-forming depth having a greater impact. As the pre-forming depth and pressure step height decrease, and the die depth increases, the neck thickness of the joint increases, with die depth having a greater impact. Shear and peel strength experiments show that during shear test, the DP780/AA5052 joint exhibits peel and shear failure, while the DP980/AA5052 joint only exhibits peel failure. During peel test, both joints show aluminum plate tearing failure. A comparison of the shear strength of the two joints reveals that the DP980/AA5052 joint has higher connection strength than the DP780/AA5052 joint, confirming the feasibility of pre-formed clinching joint of ultra-high strength steel and aluminum alloy sheets. |
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