Study Of Relationship Between Technology Of Half-Hollow Riveting And Shaping Quality About Self-Piercing Rivets

The rapid development of automobile industry is not only bring a variety of convenience, but also bring some pressure on the environment, At the same time, people are becoming more and more focus on automobile fuel economy, this requires auto makers lightweight cars inevitably, with aluminum and other non-ferrous metal instead of steel plate is an effective method for automotive light weighting. Studies show that half-hollow rivet riveting is an effective way of solve the connection of aluminium plate and steel plate, and it is also a kind of effective means of automotive light weighting. The forming process and the joint strength of the relationship between half-hollow rivet design parameters has few studies.In this paper, the relationship between the process parameters and the forming quality of the semi hollow rivet self-piercing riveting is studied in order to achieve the best effect by optimizing the parameters of the rivet.This paper firstly used the finite element software DEFORM-2D for the riveting process simulation and illustrates the riveting process. In order to design and improve the self-piercing rivets and riveting equipment, we use 3D printing production debugging equipment for the device, it can complete equipment debugging quickly and accurately. It's found that punch moved to the minimum when the distance of 3.2mm of end face and sheet in riveting total thickness 4 mm sheet and riveted joint rivet head compact between sheet metal and seamless.Secondly,by using the method of numerical simulation for rivet parameter optimization to design half-hollow rivet and concave die mound, parameter were anterior horn angle after a and b, pipe tiptoe radius r and rivet leg is the distance between the tip and outer diameter d, through optimized analysis to determine a=40°, b= 30°and r= 0.04mmFinal processing different d values of rivet for riveting experiment, and produced tensile and tear samples, using the universal mechanical testing machine for different parameter d is riveted sample of tensile test and tear experiment. Experimental results show that the tensile and tearing the specimen to produce maximum pull riveting joint has been destroyed. The order of magnitude of the load size and the size of the tensile specimen (tearing specimen) under the initial displacement is not consistent with the maximum load of the tensile specimen. Choose the rivet is not only according to the sample load size, but also according to the load size of the sample strength at the initial displacement to choose which kind of specification.This paper also preliminarily explore the internal shrinkage type rivet, contrast inside shrink type rivet and the mechanical properties of samples after the extended type rivet. Whether the maximum tensile force is at the initial displacement, the tensile strength of the external expansion specimen is larger than the tensile strength of the internal compression type specimen, and the mechanical properties of the expanded specimen are better than that of the internal compression type.