摘要:针对目前车用 22MnB5 高强钢和 7075 铝合金板料在连接工艺上存在的问题,提出一种高强钢和铝合金异种材料车身 零件的热铆接冷模具淬火(Hot riveting quenching, HRQ)无铆钉铆接工艺,利用 22MnB5 在高温下良好的成形性及易淬性,实 Abstract:For the current problems of connecting technique for high strength steel 22MnB5 and aluminum alloy 7075 sheets, a process called hot riveting quenching clinching to connect autobody parts of high strength steel and aluminum alloy dissimilar materials is proposed. By using good formability at elevated temperatures and quenchability of 22MnB5, effective

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... joints between 22MnB5 and 7075 are obtained. The feasibility of hot riveting quenching clinching is confirmed by the forming and quenching finite element models. Full martensite structure of the 22MnB5 at riveted joints is formed, so that the strength of the joints is ensured. The effect of the riveting temperatures for the high strength steel on the joint dimensions like the neck thicker value T n and the self-locking value T u is studied from the aspects of simulation and experiment. The results indicate that the T n and T u both present a trend that increases first and then decreases, and the T u is affected more significantly by temperature on the temperature range from 600 to 800 ℃. Both of the T n and T u reach the maximums at 700 ℃, and it can be concluded that 700 ℃ is the best initial temperature of the high strength steel plate for riveting. Key words:high strength steel;aluminum alloy;hot riveting quenching;clinching;riveted joint