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Method for establishing and using forming limit diagram of laser tailor-welded blank

A technology of forming limit diagram and laser tailor welding, applied in laser welding equipment, welding equipment, special data processing applications, etc., can solve problems such as difficulty in establishing FLD, difficulty in obtaining primary and secondary strains, small weld width, etc., to avoid Difficult to measure effect

Inactive Publication Date: 2010-06-16
TONGJI UNIV
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  • Abstract
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Problems solved by technology

However, due to the small width and high hardness of the weld, it is difficult to obtain the primary and secondary strains at the failure point, which brings difficulties to the establishment of FLD in the weld area; on the other hand, the FLD of a single plate cannot evaluate the failure of the weak side. Weld plate formability
[0012] As mentioned above, so far, the existing evaluation methods for tailor welded blanks have limitations, and there is an urgent need to accurately judge and evaluate the formability of tailor welded blanks in engineering, so as to provide guidance for actual stamping production

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  • Method for establishing and using forming limit diagram of laser tailor-welded blank
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  • Method for establishing and using forming limit diagram of laser tailor-welded blank

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Embodiment Construction

[0030] Firstly, the specific steps of the present invention to establish the forming limit diagram of the laser welded blank are described.

[0031] A. If figure 1 As shown, the tailor-welded blank is mainly composed of strong-side base metal 10, welding zone material 30 (weld seam), and weak-side base metal 20. The direction parallel to the weld is taken as the Y direction, and the direction perpendicular to the weld is In the X direction, establish a coordinate system. The purpose is to distinguish two failure modes: when the Y-direction strain of the base metal on the weak side is greater than the X-direction strain, the welding zone material fails; when the Y-direction strain is smaller than the X-direction strain, the weak-side base metal fails; Generally speaking, there are generally only these two types of failure modes in the vicinity of the weld.

[0032] B. When the material in the welding zone fails, that is, the strain in the Y direction is greater than the strai...

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Abstract

The invention discloses a method for establishing a forming limit diagram of a laser tailor-welded blank. The method comprises the following steps: (A) establishing an XY coordinate system of which the X represents a direction perpendicular to the direction of a welding seam and the Y represents the direction parallel to the direction of the welding seam; (B) calculating an ultimate strain of a material in a welding zone by adopting an empirical formula and combining with performance parameters of the material, and then, based on stress strain relation of the material in the welding zone and weak side parent metal, calculating to obtain weak side parent metal FLC by combining with the performance parameters of the weak side parent metal when the material in the welding zone is invalid, namely, Y-direction strain is larger than X-direction strain; (C) calculating the weak side parent metal FLC when the weak side parent metal is invalid, namely, the Y-direction strain is smaller than the X-direction strain by adopting the empirical formula and combining with the performance parameters of the weak side parent metal; and (D) marking the weak side parent metal FLCs obtained in step (B)and step (C) into an XY direction strain coordinate system at the same time to establish the forming limit diagram of the laser tailor-welded blank. The method can establish the forming limit diagramof the laser tailor-welded blank suitable for engineering application to effectively evaluate forming limit of the tailor-welded blank.

Description

technical field [0001] The invention relates to the field of sheet metal forming processing, and relates to a method for establishing and using a failure criterion for laser tailor welded blanks with differential thickness, which is mainly used for accurately judging the necking or cracking of laser tailor welded blanks with differential thickness, and evaluating its formability. Background technique [0002] Tailored welded blanks refer to two or more sheets of different thicknesses, different materials and different surface conditions that are welded by laser to form a whole sheet, and then stamped to meet the different properties of the sheets at different positions of the stamping parts. Require. Laser tailor welded blanks are widely used in the automobile industry due to their advantages of reducing body weight, improving safety performance and reducing manufacturing costs. Tailored welded blanks are used in the central passage and door inner panels of Shanghai Volkswa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50B23K26/20B23K26/26
Inventor 林建平鲍文华戴轶邢丹英胡巧声陈水生孙成智
Owner TONGJI UNIV
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