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Steel substrate for producing a thermoformed and press-hardened steel sheet component and thermoforming method

A technology of thermoforming and matrix, applied in the field of steel matrix and thermoforming for manufacturing thermoformed and pressure-hardened steel plate members, which can solve problems such as roll cracking

Active Publication Date: 2020-06-26
VOLKSWAGEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This can lead to premature roll breakage

Method used

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  • Steel substrate for producing a thermoformed and press-hardened steel sheet component and thermoforming method
  • Steel substrate for producing a thermoformed and press-hardened steel sheet component and thermoforming method
  • Steel substrate for producing a thermoformed and press-hardened steel sheet component and thermoforming method

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Embodiment Construction

[0054] Next according to figure 1 The basic process sequence or process route for producing a hot-formed and press-hardened steel sheet part will be explained. The as yet uncoated steel matrix 1 is thus provided as rolled-up strip material (coil). The rolled strip material 1 is subjected to PVD coating step I, after which according to figure 2 to elaborate. PVD cladding is carried out in PVD cladding step I, wherein cladding material 3 ( figure 2 ) in physical gas phase separation (PVD) as PVD thin layer 5 ( Figure 4 ) is vaporized and evaporated onto the steel substrate 1 . The cutting step II follows, in which the now coated strip-shaped material 1 is cut into slabs in the cutting station II. The slab is then fed to the actual thermoforming process, which figure 1 are represented by process steps III to VII. The slab coated with the thin PVD layer 5 is therefore heat-treated in heat treatment step III, for example in a roller hearth furnace, above the austenitizing...

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Abstract

The invention relates to a steel substrate for producing a thermoformed and press-hardened steel sheet component and a thermoforming method, wherein in a thermal treatment step (III), heat treatment is performed on the steel substrate (1) to exceed an austenitizing temperature Ac3; in a placing step (IV), the heat-treated steel substrate (1) is placed in a forming tool and in a press hardening step (V), steel substrate (1) is thermally formed and cooled, namely in a condition of forming the steel sheet component, wherein the steel substrate (1), particularly hardenable, carbon-containing, boron-containing and / or manganese-containing quenched and tempered steel is covered by an anti-oxidizing layer (5). According to the steel substrate, the anti-oxidizing layer (5) is a thin layer, and furthermore before the thermal treatment step (III), the anti-oxidizing layer can be applied to the steel substrate (1) in a coating step (I).

Description

technical field [0001] The invention relates to a steel matrix for producing hot-formed and press-hardened steel sheet components according to the preamble of claim 1 and to a hot-forming method according to claim 9 . Background technique [0002] Hot-formed steels such as 22MnB5 have an almost completely martensitic structure after the hot-forming process with a nominal tensile strength Rm of 1500 MPa. Currently, the strength of these hot-formed steels is further increased to 2000 MPa by, for example, increasing the carbon content in the steel matrix. [0003] In this type of thermoforming method, the steel matrix is ​​provided as an as yet uncoated, rolled-up strip material (coil). The hot forming process is preceded by a hot dipping process in which the steel matrix is ​​coated with an AlSi layer acting as an oxidation protection layer. To carry out the hot dipping process, the coiled strip material is unrolled in the production direction in a winding station (Wickelsta...

Claims

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Application Information

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IPC IPC(8): C23C14/56C23C14/24C23C14/58B21D37/16
CPCC23C14/562C23C14/24C23C14/58B21D37/16C23C10/02C23C10/60C23C10/18C23C10/20C23C10/22C25D11/04C23C14/5853C23C14/5806C23C14/16C21D1/673C21D8/005C21D9/0068
Inventor T.奥皮茨M.科齐安
Owner VOLKSWAGEN AG
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