无铆连接技术在汽车铝合金板材的连接领域得到了广泛应用。但是，无铆连接技术在连接点处产生的较高的凸起又制约了这项技术的发展。为了降低连接点的凸起高度，提出一种适用于汽车铝合金板材的平压整形无铆连接技术。通过分瓣式模具和平滑模具产生平压整形无铆连接点，对无铆连接点进行拉伸试验。通过拉伸试验得到无铆连接点的拉伸强度、能量吸收和失效模式等重要参数，并对连接点的颈厚值和凸起高度进行分析。研究表明，平压整形无铆连接技术可有效提高连接点的强度和能量吸收能力。断裂失效是平压整形无铆连接点的主要失效模式。此外，平压整形无铆连接技术在降低凸起高度的过程中可增加颈厚值，从而增加连接点强度。
陈超
,
赵升吨
,
崔敏超
,
韩晓兰
,
赵旭哲
,
范淑琴
. 汽车铝合金板材平压整形无铆连接技术的研究[J]. 机械工程学报, 2017
, 53(18)
: 42
-48
.
DOI: 10.3901/JME.2017.18.042
The mechanical clinching technology has been widely used in the joining of aluminium alloy sheet of the automobile. However, the development of this technology is restricted by the high protrusion above the clinched joint. A flat-reshaping method which is used to join the aluminium alloy sheet of the automobile is proposed to reduce the protrusion height. The flat-reshaped joint is produced by extensible dies and flat dies, then the tensile test is carried out on the clinched joint. The tensile strength, energy absorption and failure mode are gotten by the tensile test. The neck thickness and protrusion height are also analyzed. The results show that the flat-reshaping method can increase the strength and energy absorption of the joint. Neck fracture mode is the main failure mode of the flat-reshaped joint. In addition, the neck thickness can be enlarged to increase the strength of joint with a reduction of the protrusion height by the flat-reshaping method.
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