Method for press hardening thermoformable blanks

A press quenching and thermoforming technology, applied in quenching agents, forming tools, quenching devices, etc., can solve problems such as wear, forming tool pollution, slab hydrogen embrittlement, etc.

Pending Publication Date: 2021-12-21
比尔斯坦有限责任两合公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of this anti-corrosion coating is that it entails additional costs, wherein the forming tool can also be contaminated by this coating and thus be subject to greater wear
[0007] Also disadvantageous is the possibility of hydrogen embrittlement of the slab due to the anti-corrosion coating

Method used

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  • Method for press hardening thermoformable blanks

Examples

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Comparison scheme
Effect test

Embodiment Construction

[0082] According to the invention, the slab 1 is conveyed in the direction of the movement arrow 2 through a heating zone marked 3 in which the slab is heated at least partially, preferably completely, continuously or discontinuously at least to austenitization The temperature is at or slightly above the austenitizing temperature, in this example to about 1000°C.

[0083] The slab 1 is an uncoated steel material made of hot-formable steel. In this case, the ingress of oxygen is prevented during the heating to the austenizing temperature in the heating zone 4 . The slab 1 heated to the austenitizing temperature is cooled in an intermediate cooling zone 4 to a temperature below the austenitizing temperature but above the martensite start temperature, for example to 600°C. The slab 1 is then introduced into the forming tool 5 within seconds of leaving the cooling zone 4 . Here, the temperature in this example is about 550°C. In the forming tool 5 the blank 1 is formed and pre...

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PUM

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Abstract

The invention relates to a method for press hardening a thermoformable slab (1) made of steel, comprising the following method steps: passing a bare, uncoated slab (1) through a heating zone (3) and heating to an austenitizing temperature, preventing oxygen ingress during heating to the austenitizing temperature, removing the slab (1) from the slab (1), cooling the slab (1) thus heated to a temperature below the austenitizing temperature but above the martensite starting temperature without oxygen ingress (intermediate cooling) (4), then introducing the slab (1) into a hot forming tool (5) within several seconds, removing formed and press-quenched in the tool (5), and the formed slab (1) from the tool and storing elsewhere.

Description

technical field [0001] The invention relates to a method for press-hardening a slab made of hot-formable steel. Background technique [0002] It is known in the prior art, for example, to split slabs of steel strip and then to introduce these slabs one after the other into an oven in which the individual slabs are heated to the austenitizing temperature or slightly higher. After the slabs are properly heated, they are introduced into forming and press hardening tools. Subsequently, the formed part is removed from the tool and stored, for example. [0003] It is also known to first cold-form the slab and trim it to shape in a tool after being produced from the steel strip. It is then heated again to the austenitizing temperature and transferred to the forming and hardening tool, where the formed part is hardened. [0004] It is known to carry out press hardening of uncoated slabs, wherein the scale must then be removed in a very complicated manner afterwards, for example b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D9/46C21D1/18C21D1/673C21D1/74
CPCC21D9/0081C21D9/46C21D1/18C21D1/673C21D1/74C21D9/0018C21D2211/008C21D2211/002C21D2211/001C21D2211/005C21D2211/009B21D22/022B21D22/208C22C38/00C22C38/32C22C38/28C22C38/02C22C38/04C21D1/613B21D37/16B21D37/10C21D9/561C21D9/48C21D9/0062C21D1/34C21D7/13C21D8/0221C21D8/0247C21D11/005C21D2241/00
Inventor S·A·穆萨维里齐
Owner 比尔斯坦有限责任两合公司
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