Test device and method for acquiring limit strain of laser tailor welded plate plane with different thickness

Abstract

The invention discloses a tester and method for obtaining plane limiting strain of a differential tailor welding blank; the method comprises the following steps: a splint mechanism consisting of an upper clip and a sectional lower clip, a welding blank tensile sample is positioned between the upper clip and the sectional lower clip; a height adjusting sheet is arranged between sectional lower clip and a base, the sectional lower clip and the height adjusting sheet are fixed on the base, a sliding block is arranged between the upper clip and a top pressing plate, the upper clip and the sliding block are fixedly connected by adopting a bolt passing through the middle of the top pressing plate, the tester is arranged in a conventional plate tensile test machine for uniaxial tension test and the limiting strain value is measured; the tester and method of the invention can obtain better plane strain state, have stable test result, simple structure, low test cost, simple and convenient operation, and high test efficiency and the sample is flat after the test.

Description

technical field [0001] The invention relates to the field of sheet metal forming processing, in particular to a device and method used for testing the forming performance of laser tailor welded blanks with differential thickness, which are mainly used to accurately and quickly obtain the plane limit strain of laser tailor welded blanks with differential thickness. Background technique [0002] Different thickness laser welded blanks are made of two plates of different thicknesses that are welded together by laser after blanking and before stamping to meet the performance and thickness requirements of different parts. The base metal can have different mechanical properties and Plating type. The difference in the properties of the base metal and the existence of the weld seam in laser tailor-welded blanks of different thicknesses have changed the plastic forming law of the traditional single sheet, resulting in a significant decrease in the overall formability. [0003] In or...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of poor stability of traditional plane strain test results, heavy workload, and inapplicability to tailor-welded blanks of differential thickness, and considering the thickness difference of tailor-welded blanks, the present invention proposes a method that can accurately and quickly obtain the plane limit of tailor-welded blanks of differential thickness. Strain test device and test method

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