High-strength steel medium-thick plate stamping part for preventing edge cracking, manufacturing method and application

Abstract

The invention discloses a high-strength steel medium-thick plate stamping part for preventing edge cracking, a manufacturing method and an application thereof, and relates to the technical field of automobile stamping die technology. Add a supplementary shape to the drawing process DRAWING (DR) to make up for the material shortage during plastic deformation of this part, and summarize the calculation formulas for the shape and volume of the supplementary process. Under the condition that the trimming process TRIMING (TR) guarantees the necessary shape of the workpiece, the process is optimized and improved, and the local punch and die trimming edge of the trimming mold in the pre-flange forming process are corrected to ensure that the gap between the punch and die is reasonable. The trimming curve is excessively smooth to prevent cracking due to local stress concentration during the flanging process, and a repair guidance plan is summarized. The repair method of the invention is simple, consumes less resources and does not require external processing. According to the calculation formula and the guiding scheme, the end cracking phenomenon caused by the flanging of the edge of the stamping part of the medium and thick plate can be solved quickly and effectively.

Description

technical field [0001] The invention relates to the technical field of automobile stamping die technology, in particular to a high-strength steel medium-thick plate stamping part for preventing edge cracking, a manufacturing method and application thereof. Background technique [0002] At present, based on the consideration of automobile safety, high-strength steel is widely used in the safety structural parts of the car body, and the thickness is often greater than 1MM, which belongs to the medium and thick plate stamping parts. High-strength steel is a difficult-to-form material. As the strength increases, the plasticity of high-strength steel decreases. Often at the edge of curved trimming, cracking often occurs due to problems in the flanging process, resulting in the scrapping of the workpiece. [0003] The processing of stamping parts mainly includes drawing process DRAWING (DR), trimming process TRIMING (TR), and flanging process FLANG (FL). [0004] In the trimming...

AI Technical Summary

Problems solved by technology

[0007] (1) The problem of edge cracking in the forming of high-strength steel plates has always been a difficult research point in the industry. The cracking of traditional mild steel is mostly the result of excessive thinning of the local plate thickness, while the edge cracking of high-strength steel is a local ductile fracture behavior. Thickness and thinness are not significant

Different people have different repair methods, and the effect is quite different, lacking a systematic and perfect repair plan

[0009] (2) The flanging of the workpiece in the prior art is prone to cracking

[0010] The difficulty of solving the above problems and defects is: how to solve the poor mechanical properties of the plate, the low elongation of the material during forming, the tensile stress received during the forming process of the material exceeds the strength limit of the material, and the workpiece will crack

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