Forming Rules And Opimization Process Of Clinch Jointing Technique

Clinch joining technique is a technological process with the help of the punch thatproduces instantaneous high pressure on two or more metal sheets to complete drawingand extrusion. Based on the plastic deformation ability of connected sheets, it is to format ainterlock point with the certain tensile and shear strength.Clinch joining technique is a single step mechanical joining method that combinesmaterials without damaging the surface and additional complementary joining elements.Using this technology, it is possible to join mateirals of different materials, different sheetthickness. It also has advantage that ’cant be replaced by electric welding and traditionalconnection. The connection process is easy to automate, detect and monitor. It is canconnect a single or multi-point simultaneously. It has been widely applied in the modernindustry fields.In this dissertation, the5052aluminum alloy as the carirer, the stress and straindistirbution of metal flow duirng the process of irveting are analyzed, and the changeregulation of clinch point neck thickness values (N) and interlocking (U) under differentmould geometric parameters is simulated by the aid of finite element analysis softwareDEFORM-2D to the geometric parameters of different mould of5052aluminum rivetconnection process and tensile failure. Apply plastic forming principle to analyze irvetingnode failure forms and derive the oretical mechnaics corresponding formulae In addition,utilize self-developed riveting device and tensile experimental fixture to verify simulationand make a conclusion. The main research contents of this article are as follows:1.Numerical simulation analysis. Establish geometric model of the irveted structureSimulate5052aluminum alloy forming process of different parameters by observing therules of metal flow character, equivalent stress and strain with joining neck thick andembedded value. Determine the optimal parameters (concave die, punch diameter, bottomdiameter thickness values and the depth of the concave die)2.The theoretical analysis. Analyze stress distirbution by the pirnciple of plasticforming and joint failure modes in the process of no rivet connection, deducecorresponding theoretical calculation formula.3.Clinch joining experiment. Develop corresponding clinch joining experimentdevice, according to simulating parameters. Design expeirmental scheme and work outclinch expeirments of different dies geometrical parameters and obtain clinch samples.Measure and collect clinch point neck thickness values (N) and interlocking (U),andanalyze the clinch joining property. 4. Mechanical experiment. Develop auxiliary fixture of shear force and tensile forcein clinch joining point. Obtain the shear force and tensile force date by universal testingmachine carry on shear force and tensile force expeirments.5Analyze the results. Compare numerical simulation and theoretical results withexpeirment results to confirm their application value and optimization parameters, thenfurther investigate the same kind of mateirals of the same thickness of clinch joiningprocess parameters and conclude the results.