A Method for Evaluation of Hot Stamping Cracking Performance of Automobile Parts
A technology of auto parts and evaluation methods, which is applied in the directions of strength characteristics, testing the ductility of materials, and testing the strength of materials by applying stable tension/pressure.
Active Publication Date: 2019-09-17
HUNAN UNIV
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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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[0045] In order to enable those skilled in the art to better understand the technical solution of the present application, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0046] The orientation terms such as up, down, left, right, front and rear in this application document are established based on the positional relationship shown in the drawings. If the drawings are different, the corresponding positional relationship may also change accordingly, so this should not be understood as limiting the scope of protection.
[0047] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0048] The invention provides a method for evaluating the hot stamping fracture performance of auto parts, which evaluates the quality of the hot stamping performance through the forming margin cloud chart and the forming limit chart corresponding to the same color gradient. Its implemen...
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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...
Claims
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IPC IPC(8): G01N3/28G01N3/18G06F17/50
CPCG01N3/18G01N3/28G01N2203/0019G01N2203/0067G06F30/23
Inventor 崔俊佳孙光永李光耀胡明
Owner HUNAN UNIV