Shearing strength test device of sheet metal convex platforms

Abstract

The invention relates to a shearing strength test device of sheet metal convex platforms, belonging to the technical field of automobile manufacture. The shearing strength test device of the sheet metal convex platforms comprises a test frame mechanism and two sliding block groups, wherein the two sliding block groups are arranged up and down, and the contact planes of the two sliding block groups are anastomotic. The test frame mechanism comprises a cross rail group, a vertical rail group and a backup plate, and the vertical rail group and the backup plate are respectively arranged at the top and the side face of the cross rail group. The test device is structurally characterized in that the contact area of a lower sliding block for the sheet metal part of a test sample is continuously increased so as to prevent the test sample from sliding, loosing, inclining and the like in the loading process. The sliding block group of a tapered wedge mechanism converts vertical-direction force exerted by a press machine for the device into horizontal-direction force for the test sample. During testing, the convex platform part of the test sample does not need to be clamped, and therefore thetest device can be suitable for the sheet metal convex platforms with different shapes and close the test frame mechanism of a force system to prevent the press machine from bearing transverse load.

Description

technical field [0001] The invention relates to a device in the technical field of automobile manufacturing, in particular to a device for testing the shear strength of a plate boss. Background technique [0002] Sheet metal boss parts are widely used in the automotive industry, such as brake pads and seat recliner parts often have local boss features. Bosses are generally used to achieve positioning and assembly functions, and need to bear a certain degree of shear load during use. Therefore, quantitative evaluation of the mechanical properties of sheet metal boss parts and consideration of the shear resistance of the boss will help to reasonably select the boss geometric size and boss forming parameters, and shorten the research and development cycle. [0003] Through the literature search of the prior art, it is found that the commonly used shear strength testing devices are mainly suitable for regular samples such as cylindrical and square. Among them, the utility mode...

AI Technical Summary

Problems solved by technology

If the above-mentioned shear strength testing device is used for special-shaped samples such as sheet material bosses, the following disadvantages exist: 1) it is impossible to effectively fix and position the sheet material bosses in the device; 2) it cannot adapt to different sheet material thicknesses , Sheet metal bosses with different boss shapes; 3) The test device will make the press bear lateral loads, which will affect the test accuracy; 4) The important friction pairs in the test device are not given special consideration

Therefore, it is impossible to test the shear performance of the sheet metal boss stably, easily and accurately

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