Evaluation method for hot stamping fracture property of automobile part

Abstract

The invention relates to an evaluation method for the hot stamping fracture property of an automobile part. The evaluation method comprises the steps that the shortest distance between a strain-temperature state coordinate point of one unit on a numerical model subjected to finite element simulation and a forming limit curve at corresponding temperature is expressed as a forming margin, and the degree of the hot stamping part relative to a fracture limit is reflected by the forming margin. The forming margins of all the units on the numerical model subjected to finite element simulation are calculated, and distribution of the strain-temperature state points is expressed in a forming limit diagram through different colors according to the forming margin gradient; the forming margins are stored in a text document in a certain format, the text document containing the forming margin information is read by a stamping forming finite element simulation software postprocessing module, and the stamping property of the hot stamping part is directly reflected in the mode of a forming margin cloud diagram on the hot stamping part numerical model. According to the method, the stamping property of the hot stamping part can be more accurately judged.

Description

technical field [0001] The invention relates to the field of hot stamping processing of metal plates, in particular to an evaluation method for hot stamping fracture performance of auto parts. Background technique [0002] With the increasing requirements for automobile crash safety and lightweight, high-strength steel plates are widely used in automobile manufacturing as structural parts. The forming of high-strength steel plate at room temperature is poor, and it is easy to produce large springback, which requires a large forming force. The hot stamping high-strength steel plate has good formability. The high-strength steel plate hot stamping process can produce parts with complex geometry and high dimensional accuracy, and the yield strength of hot-formed parts can reach 1000MPa after the quenching process, and the tensile strength can reach 1500MPa. Therefore, hot stamping parts can reduce weight under the premise of meeting the safety requirements of automobile collisi...

AI Technical Summary

Problems solved by technology

This method can predict whether the formed part will crack or not, and cannot evaluate the degree of cracking, or the safety of uncracked areas

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