Clinching joint forming speed impact on the joint strength

This publication presents the impact of the forming speed of clinching joints on the static strength of a joint for DX51D + Z275 sheet material. For the chosen parameters of joined sheet materials (total sheet thickness 2 mm) the geometry of forming tools, such as punch and die diameters (and radial clearance between the tools), the die depth and the parameter X (the minimum thickness of the joint embossment) were selected. The speed of joint formation (punch movement) was 3, 50 and 100 mm·s–1. To reduce the samples deformation during the tensile test the special apparatus was used. The mean values of forming parameters e.g., standard deviation and coefficient of variance of both forming and tearing forces were calculated. According to the ISO 12996-2013 standard the main strength structure parameters of clinching joints were determined.

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