Control method and device for hot-forming plasticity distribution of high-strength steel

Abstract

The invention provides a control method and device for hot-forming plasticity distribution of high-strength steel. The control method comprises the following steps of: step one, heating a heating region of a mold to an appointed temperature; step two, placing and heating a blank in a heating furnace, so that the blank is austenized; step three, taking out the blank from the heating furnace, placing a part of blank in the heating region of the mold according to actual requirements, and placing the another part of blank in a cooling region of the mold; and step four, moving a press machine downwards so as to drive the mold to be closed, so that the blank in the mold is molded. The control device comprises a low mold seat board, a lower voltage withstanding heat insulation plate, a lower mold heating region insert, a lower mold cooling region insert, an upper mold heating region insert, an upper mold cooling region insert, a heating rod hole, a silicon controlled rectifier, a controller, a thermocouple and a heating rod. The control method and device can ensure that a high-strength steel sheet has different strength and plasticity in different regions.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method and device for controlling plasticity distribution of high-strength steel thermoforming. technical background [0002] In recent years, with the increasing requirements for automobile lightweight, energy saving and emission reduction, and safety, ultra-high-strength steel is increasingly used in the manufacture of important structural parts and safety parts of the car body, such as A-pillars, B-pillars and anti-collision beams, etc. Since the strength of the high-strength steel plate after cold stamping can reach 1300-1700MPa, the required forming load is large, and the springback of the formed part is difficult to control, resulting in poor dimensional and shape stability of the part. Therefore, when using high-strength steel plates to form automotive safety parts, hot forming methods are generally used. [0003] In the application of automotive safety...

AI Technical Summary

Problems solved by technology

Tailored welded blanks are steel plates with different components and different properties that are welded together by laser tailoring. However, the blank processing cost of tailor welded blanks is high, and it is difficult to determine the position of the weld, and it is difficult to determine the forming limit of the weld in the stamping process.

Continuously variable cross-section thin plate technology, that is, differential thick plate technology, can obtain plates with different thicknesses through rolling, but the production cost of small batches of continuous variable cross-section rolled plates of the same specification (same rolling composition, mechanical properties and width) is high and difficult to achieve Curve stitching, 3D stitching, and widening stitching

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