A method for predicting edge cracking in sheet metal stamping forming considering trimming quality
A sheet metal stamping forming technology, which is applied in the field of edge cracking prediction of sheet metal stamping forming considering the trimming quality, can solve problems such as complexity, inapplicability to production practice, cumbersome calculation process, etc., to achieve accurate and rapid prediction, taking into account Calculation efficiency and prediction accuracy, the effect of ease of use
Active Publication Date: 2022-07-19
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
Although the prediction method proposed in the above literature simplifies the simulation process of the first step and establishes a relatively clear damage mapping index, the overall calculation process is still cumbersome and complicated, and is not suitable for production practice
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[0044] The invention predicts the edge cracking phenomenon that is easy to occur during stamping and forming of QP980 ultra-high-strength steel in actual production. like figure 2 As shown, the present invention comprises the following steps:
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The invention relates to a method for predicting edge cracking of sheet metal stamping and forming considering trimming quality, comprising the following steps: 1) performing edge trimming experiments under different trimming processes on the metal sheet; The local strain distribution at the moment of fracture, and the strain field distribution at the moment of fracture is extracted according to the photographed photos; 3) Select the ductile fracture criterion; 4) Perform parameter calibration on the material parameters in the selected ductile fracture criterion; 5) According to the parameter calibration The ductile fracture criterion defines the damage parameter D as the criterion for the failure of the sheet metal stamping process; 6) According to the strain value at the fracture moment obtained in step 2), the edge corresponding to each trimming process is obtained by finite element simulation. Damage initial value D 0 7) Realize the prediction of the edge cracking phenomenon of the same metal sheet under different edge trimming processes. Compared with the prior art, the present invention has the advantages of simplicity, convenience, practicality, speed and accuracy.
Description
technical field [0001] The invention relates to the field of metal material stamping and forming, in particular to a method for predicting edge cracking of metal sheet metal stamping and forming considering the quality of trimming. Background technique [0002] Before deep drawing, bending, reaming, flanging and other subsequent forming processes of sheet metal, blank sheets are often prepared by punching, laser cutting, wire cutting, etc. The quality of the edge is very different, and the susceptibility to edge cracks is also different. Edge cracks are a common failure form during stamping and forming processes such as flanging or reaming of sheet metal. This is because the edge defects caused by the trimming process cause the material to break before reaching the normal forming ability, which seriously reduces the material properties and affects the stability of production. Numerous studies have shown that, due to the existence of edge defects, forming limit diagram (FLD...
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Login to View More IPC IPC(8): B21D22/02G06F30/23
CPCB21D22/02G06F30/23G06F2113/24
Inventor 李代洲吴会平李细锋陈军展学鹏唐丁丁
Owner SHANGHAI JIAO TONG UNIV