Development Of Lightweight Electromagnetic Riveter And Riveting Process Experiment

Electromagnetic riveting technology is a new kind of riveting technology,which generates electric current through the electric energy stored in the capacitor,the current generates a magnetic field when passing through the coil,the varying magnetic field produces an induced electromotive force on the driv e plate,and finally drive between the coil and the coil Repulsion of such a way to work.Electromagnetic riveting cracks the rivet through the instantaneous impact load,and the rivet is deformed by the dynamic characteristics of the material under the stress wave.The technology of electromagnetic riveting gun is the application equipment in actual production,and has been widely used in aerospace field.Domestic electromagnetic rivet gun is still in the exploration stage because of its late development,so there are some problems such as lack of riveting force,large recoil force,inconvenient and inconvenient.This paper first introduces the development status and working principle of electromagnetic riveting at home and abroad,analyzes the problems of som e electromagnetic riveting guns at the domestic stage,and analyzes and summarizes the existing electromagnetic riveting guns,and further explores its characteristics and advantages.Theoretical analysis of electromagnetic riveting gun.The discharge circ uit is equivalent to the double model,and the discharge current is solved;The magnetic pressure is calculated by extracting the magnetic induction strength;The propagation mode of stress wave in circular bar is analyzed.This paper introduces the basic principle of the spring damping system,and then designs the recoil damping system.The electromagnetic riveting process is simulated by sequential coupling method,and the electromagnetic coupling model excited by current density is established by ANSYS software.Taking this as the boundary condition,the rivet deformation analysis model and recoil force analysis model are established in ANSYS/LS-DYNA module.The distribution of the electromagnetic force on the drive plate and the deformation law of rivets are analyzed.The optimal parameters of electromagnetic riveting are achieved by adjusting the parameters such as voltage,capacitance and thickness of drive slice.It provides the basis for the design o f electromagnetic riveting gun.Using SOLIDWORKS software to make the 3d modeling of the riveting gun,according to the numerical simulation and theoretical calculation,the lightweight hand-held electromagnetic riveting gun was designed and manufactured,and the various parameters of the riveting gun were adjusted,so that the weight and riveting force of the riveting gun reached the optimal parameters.The mass o f the assembled rivet gun is 2.8 kg,and the operators can handle it with hands;The aluminum alloy rivets with high strength of 4mm can be formed.The recoil force of the electromagnetic rivet gun was tested using a piezoelectric quartz force sensor.The maximum average impulse of the rivet gun was 3N · s,which was much lower in the case of aluminum alloy rivets capable of striking ?6 mm high strength The 9.8 N · s of the standard requirements for the operator's recoil for the operator does not have any effect on the safety and health of the operator.