A Crack Evaluation Method for Sheets Flowing Through Drawbeads for Stamping

Abstract

The invention relates to a cracking judgment method for a plate material flowing through a drawbead and used for stamping. The method comprises the following steps of through a grid test, judging whether a to-be-tested point of the plate material flowing through the drawbead is in a cracking region or not, if the to-be-tested point is not in the cracking region, calculating a safe margin of the to-be-tested point, if the safe margin is greater than a standard value, indicating that a cracking risk does not exist, and if the safe margin is smaller than the standard value, correcting a test result; if the to-be-tested point is in the cracking region, directly correcting the test result; and after the test result is corrected, recalculating the safe margin and comparing the safe margin with the standard value to judge whether the cracking risk exists or not. Compared with the prior art, the method has the advantages of high judgment precision, no influence on performance after plate formation, easy realization and the like.

Description

technical field [0001] The invention relates to the field of automobile stamping, in particular to a method for evaluating the cracking of a sheet material flowing through a drawbead used for stamping. Background technique [0002] Die debugging, especially during drawing debugging, is often prone to cracking problems in rapid stamping production, such as mold heating and material performance fluctuations, which lead to formability problems during drawing forming, affecting the quality and dimensional accuracy of the plate. Therefore, in the debugging process, it is often necessary to ensure that there is a certain safety margin for the plate to prevent various external conditions from changing during high-speed production. Risk of wrinkling and insufficient rigidity, etc. For bake-hardening steel, insufficient forming cannot induce the bake-hardening effect, and the strength of the plate is insufficient. [0003] Through the grid experiment, the safety margin of the point ...

AI Technical Summary

Problems solved by technology

For the first method, there is a risk of cracking after mass production. Even if the cracking position is not on the final product, the cracking will affect the stress distribution in the plate, resulting in out-of-tolerance dimensional accuracy. Even if there is no cracking during debugging, it needs to pass the test. Production inspection is time-consuming and labor-intensive, and cannot meet the requirements of the entire cycle. The second type will lead to insufficient rigidity of the plate forming and the risk of wrinkling, etc.

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