Low-carbon steel rivets are commonly used in vehicles. […]
Low-carbon steel rivets are commonly used in vehicles. They are stronger than bolts in connection and smaller in weight than bolts. Therefore, they have great advantages, but their riveting defects cannot be ignored.
First of all, the riveting process is complex, requires a large number of personnel, requires high technical proficiency, and must cooperate with each other tacitly, and the connection between each process is extremely close, because the temperature of the rivet itself is extremely fast, and the time available for operation is very small. If there is a delay, the riveting will fail, and the rivets need to be scrapped and re-rivetted; secondly, during the assembly and maintenance of the vehicle, the rivets are densely located such as the impact seat, core plate, side pillars, etc., due to the close proximity of the rivets. The loosening of the front rivets after riveting occurs from time to time, and it is completely manual operation. Based on the experience of the operator, sometimes the rivet is too long and the brim is too short or the rivet head is not full. It must be removed and riveted.
Furthermore, when the rivet structure is decomposed, small rivets can be drilled out with an electric drill, and large rivets must be removed by gas cutting. It takes a lot of time for workers to remove the residual rivets and some special tools are required. There are also large-size rivets that are usually riveted by hot riveting. This process causes the stress and deformation of the central part of the rivet, the ring groove rivet, and the overall stress is large. When the riveting quality is accepted, the rivet can only be knocked. The cap listens to the sound to determine the riveting force. This method only determines the overall stress of the rivet connection, and cannot distinguish the exact values of the longitudinal tensile force and the transverse shear force. However, the connection structure does require tensile force or shear force. In order to meet the performance requirements of the shearing force, the designers enlarged the safety factor and caused unnecessary structural weight.