无头铆钉双面鼓形镦头成形工艺与性能分析

Forming Technology and Performance Analysis of Headless Rivet with Double Drum Upsetting Head

针对双面鼓形镦头无头铆钉的铆接方法,设计出适用压铆设备的专用工装,通过力学性能检测和截面微观分析对铆接结构进行了研究。结果表明,镦粗现象越明显,剪切力越大,同一直径的铆钉,镦头直径一致,镦头高度越大,剪切力越小;同一直径的铆钉,镦头高度一致,镦头直径越大,剪切力越大;不同直径的铆钉,长度相同,铆钉直径越大,剪切力越大;Φ4和Φ5铆钉均能较好填充至孔隙中,而Φ6两试片对接处出现明显的缝隙,偏心和试片错位是造成该现象的主要原因。

According to the riveting of headless rivet with double drum upsetting head, the special equipment for pressing rivet is designed. It’s concluded that the greater the shear force, the more obvious the upsetting phenomenon. It can be described as follows. The first one is: the higher the upsetting head, the lower the shear force when the riveting diameter and the upsetting head diameter are the same. The second one is: the bigger the upsetting head diameter, the larger the shear force when the riveting diameter and the upsetting head height are the same. The third one is: for the rivet of different diameters, the bigger the rivet diameter, the larger the shear force when the diameter of rivet is different. Through the incision test, it’s concluded that the rivet with the diameter of 4 and 5 can be filled well, but the diameter of 6 has obvious cracks in the joint, and the reasons for the poor filling are analyzed.