Enlargement of the application range of solid punch riveting by two-piece dies

Punch riveting with solid rivets is an admitted technology in joining by forming of metallic workpieces. Conventional this technology works with a rigid die. This causes the disadvantage of dimensioning the width of the coining contour separately for every single joining task to avoid a prematurely coining during the blanking stage. By using a two-piece die an improvement is feasible. Thus there can be realized a plane surface of coining ring and die ring during the stamping process. So an equal coining ring can be used for all joining tasks. The article shows the advantages of the two-piece dies especially in joining of different materials with distinct differences in strength. The use of these dies effects convenient technological conditions and an extended range of application for solid punch riveting