Local heat treatment system and cold forming method using the same

Abstract

The present disclosure relates to a local heat treatment system and a cold forming method using the same. The local heat treatment system includes a heating device configured to locally heat only a plastic deformation occurrence portion of a blank material to a predetermined temperature, a moving device configured to move the heating device to a position of a local heating region of the blank material, and a controller configured to control the heating device and the moving device.

Description

TECHNICAL FIELD[0001]The present disclosure relates to a local heat treatment system and a cold forming method using the same, and more particularly, to a local heat treatment system and a cold forming method using the same capable of improving the formability of an ultra-high tensile steel sheet and minimizing the springback phenomenon.BACKGROUND ART[0002]In general, weight reduction of automobiles is effective for improving automobile fuel economy, and thus, the use of a high-tensile steel sheet, which is a material having a high specific strength, is increasing in recent years. The strength of such a high-tensile steel sheet is improving, and in recent years, an ultra-high tensile steel sheet having a tensile strength of 1 GPa or more has also been developed.[0003]Because the ultra-high tensile steel sheet has a high strength, press molding of the ultra-high tensile steel sheet is not easy, so that it is easy to cause seizing due to increased molding load and increased mold wear,...

AI Technical Summary

Benefits of technology

The patent is about a system and method that uses heat treatment to improve the formability of materials by selectively heating and cooling them. This technique can reduce the molding load, minimize wear and springback, and improve productivity and quality while reducing energy costs. Additionally, artificial intelligence and sensing technology can be combined to make the process faster and easier.

Problems solved by technology

Because the ultra-high tensile steel sheet has a high strength, press molding of the ultra-high tensile steel sheet is not easy, so that it is easy to cause seizing due to increased molding load and increased mold wear, and the springback at which the molded shape returns is large, and thus the shape fixability is deteriorated.

In addition, the ultra-high tensile steel sheet has a low ductility and tends to crack when a tensile stress is applied during molding.

However, this method of heating the entire difficult-to-form material may cause unnecessary energy loss by heating even a region where molding is not performed.

However, because this method is to warm a material after heating the material in a warm forming process, the productivity due to the heating time decreases, and during material handling, the local heating part cools quickly, making it difficult to maintain a constant quality.

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