Hot stamping method for performance gradient distribution of high-strength steel parts

A high-strength, high-component technology, applied in the field of hot stamping, can solve problems such as part deformation, achieve the effects of reducing difficulty, high production efficiency, and improving elongation

Active Publication Date: 2015-06-03
东营广大金科机器人有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method requires a specially designed induction heating coil, and the parts will be deformed during the quenching heating process

Method used

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  • Hot stamping method for performance gradient distribution of high-strength steel parts
  • Hot stamping method for performance gradient distribution of high-strength steel parts

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Experimental program
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Effect test

specific Embodiment approach

[0028] Such as figure 1 Shown, the present invention selects flowing medium to carry out partial quenching for use, and its specific implementation is as follows:

[0029] 1. The hot-rolled, cold-rolled or annealed sheet for hot stamping first enters the heating furnace I and is heated until it is completely austenitized (such as figure 1 ,The first stage);

[0030] 2. After the heating is completed, a flow medium injection device (which can spray water, nitrogen and other fluid medium) is used to locally cool down to below the Ms point (such as figure 1 In the second stage, use room temperature water for quenching, and quench to room temperature (about 25°C) within 5s.

[0031] 3. The non-uniform sheet enters the heating furnace II for heating and heat preservation (such as figure 1 In the third stage, in the furnace at 930°C, the heating time is 55s).

[0032] 4. The non-uniform sheet metal after heat preservation is transferred to a press for hot stamping forming and qu...

example 2

[0034] Such as figure 2 As shown, if the present invention selects non-flowing medium (die) for quenching, its specific implementation is as follows:

[0035] 1. The hot-rolled, cold-rolled or annealed sheet for hot stamping first enters the heating furnace I and is heated until it is completely austenitized (such as figure 2 ,The first stage);

[0036] 2. After the heating is completed, the temperature of the flat mold with cooling water under the press is partially cooled to below the Ms point (such as figure 2 In the second stage, the temperature of the mold surface is room temperature 25°C, the pressure is maintained for 10s, and the temperature of the sheet metal is lowered to about 150°C).

[0037] 3. Non-uniform sheets enter the heating furnace II for heating or heat preservation (such as figure 2 In the third stage, in the 930°C holding furnace, the holding time is 45s).

[0038] 4. The non-uniform sheet metal after heat preservation is transferred to a press f...

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Abstract

The invention relates to a hot stamping method for performance gradient distribution of high-strength steel parts. The hot stamping method comprises the following steps: locally and quickly cooling homogenized sheets heated to reach austenitization to a certain temperature (cooling to be below Ms point within 1 to 30s) and quenching; feeding the sheets with non-uniform temperature into another furnace for heating at the temperature of 600 to 1,000DEG C for 0.5 to 10min; after heating, obtaining structures in a low-strength area, namely ferrites, tempered martensiteas and austenites of certain amounts, and obtaining microstructures in the high-strength area, which are still complete austenitizing structures; transferring the sheets with different microstructures into a die with cooling water for stamping, and finally obtaining hot stamping forming parts with different mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of hot stamping forming, and in particular relates to a control technology for non-uniform distribution of microstructures of hot stamping forming sheets before hot forming and quenching, so as to realize a forming method for flexible control of mechanical properties in different regions of uniform sheet material thermoforming parts. Background technique [0002] Hot stamping parts are widely used in automotive safety structural parts because of their high strength (above 1400MPa) and good formability. However, the strength is too high and the elongation is low, which greatly reduces the impact performance of the formed parts. In order to improve the crash performance of thermoformed parts under the premise of ensuring automobile safety and reducing weight, it is necessary to increase the elongation of specific parts of the formed part. Existing methods for increasing the local elongation of thermoformed pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/02C21D8/00C21D1/667
CPCB21D22/022C21D1/18C21D8/0205C21D8/1238C21D8/1244C21D2211/003C21D2211/005C21D2211/008
Inventor 高义新任晓琪
Owner 东营广大金科机器人有限公司
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