High-strength steel medium-thickness plate stamping part capable of preventing edge cracking, manufacturing method and application

Abstract

The invention discloses a high-strength steel medium-thickness plate stamping part capable of preventing edge cracking, a manufacturing method and application, and relates to the technical field of automobile stamping die processes. A process is added to a drawing process DRAWING (DR) to supplement shape, material shortage during plastic deformation of the portion is made up, and a calculation formula of the shape and size supplemented by the process is summarized. Under the condition that the necessary shape of a workpiece is guaranteed through a trimming process TRIMING (TR), process optimization and improvement are carried out, trimming cutting edges of a local male die and a local female die of a trimming die in the process before flanging forming are corrected, it is guaranteed that the gap between the male die and the female die is reasonable, the trimming curve is smooth in transition, cracking caused by local stress concentration in the flanging process is prevented, and a repair guidance scheme is summarized. The repairing method is simple, consumed resources are few, and external machining is not needed. According to the calculation formula and the guidance scheme, the end cracking phenomenon caused by flanging of the edge of the medium-thickness plate stamping part can be rapidly and effectively solved.

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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