Method for establishing and using difference thick laser assembly solder plate forming limit picture

Abstract

The invention relates to a method for establishing and using failure criteria for a laser tailor-welded blank with different thicknesses. The method is mainly used for judging the necking or the fracture of the laser tailor-welded blank with different thicknesses and for estimating the forming performance. The method for establishing a forming limit diagram of the laser tailor-welded blank with different thicknesses comprises the following steps: the tailor-welded blank forming limit diagram is formed by combining a welding area material, and a forming limit curve of the thin tailor-welded lateral mother plate; and the forming limit curve of the tailor-welded material adopts the M-K theory and is obtained by calculating performance parameters by combining the tail-welded area material. The method for using the forming limit diagram of the laser tailor-welded blank with differential thicknesses comprises the following steps: the strain value of the danger part of the part of the tailor-welded blank is measured and is divided into the strains of the welding area and the thin lateral mother plate; the measured strain is compared with the welding area corresponding to the strain, and the forming limit curve of the thin tailor-welded lateral mother plate, and whether the part of the tailor-welded plate loses effectiveness is judged. The method for establishing and using the failure criteria for the laser tailor-welded blank with different thicknesses accurately establishes the forming limit diagram, predicts successfully the failure of the tailor-welded plate, and effectively estimates the forming performance.

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] Differential thickness laser welded blank refers to the laser welding of two thin plate materials with different thicknesses after blanking and before stamping to meet the performance and thickness requirements of parts in different parts. Different thickness laser tailor welded blanks have many advantages such as reducing body weight, improving safety, and reducing manufacturing costs. At present, they have been widely used in the complete vehicle manufacturing of major automobile factories in Europe, the United States, and Japan. The front floor of the domestic FAW Aud...

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Problems solved by technology

[0009] This method can only judge the failure of the welding zone material and the base metal before tailor welding, but cannot reflect the failure of the base metal after tailor welding; in the forming limit test of tailor welded blanks, it is difficult to capture the necking phenomenon of the welding zone material, and it is difficult to obtain stable The test results

[0010] 3) Only consider the forming limit of the thin side base metal after tailor welding, and only use the FLC of the thin side base metal after tailor welding to judge the failure of the tailor welded blank

[0011] Taking the FLC of the thin side base metal after tailor welding as the failure criterion can only judge the failure of the base metal after tailor welding, but cannot reflect the failure of the material in the welding zone; Influenced by the measurement method, it is difficult to obtain stable test data

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