Research On The Technology And The Simulation Using Finite Element Analysis Of Clinching

The interest in using press-joining method for joining of thin sheets has increasedduring recent years, especially in the car industry. This is mostly a result of theeconomic advantages and the ability to join coated or unweldable sheets. Withincreased knowledge about those parameters that affect the press-joining process, thepossibility of reducing or avoiding unwanted deviations in production is increasing.The focus of this dissertation is on a non-cutting, single stroke clinching method that produces anaxisymmetric joint. The clinching process conception and parameters are discussed andsystematized. The way and the mechanism of clinching, the criterion of an optimum joint andthe failure mode of clinching are discussed. The parameters of clinching joint are summarizedsystemically. Numerical simulation was performed to simulate the clinching process and analyzea circular press joint. Distributing of stress and strain during forming process wereobtained .The influence of some process parameters (friction, material behavior, andtools geometry) was studied. The results of simulation and experiment werecompared. Reasonable computation time is achieved by using MARC FE solver withan explicit iteration technique. The result shows that it is possible to use the finiteelement method to simulate the press-joining process. Optimized joining parameterscan be obtained via FEM simulation. A method to eliminate ill-suited processparameters rapidly was obtained.