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Process for producing components having regions of differing ductility

A ductile, regional technology, applied in the direction of vehicle parts, forming tools, layered products, etc., can solve the problems of expensive corrosion protection, undesired stress peaks, etc., and achieve sufficient cathodic corrosion protection and good cathodic corrosion protection.

Active Publication Date: 2012-09-12
VOESTALPINE METAL FORMING
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This can lead to undesired stress peaks in the immediate transition region
[0006] Although significant weight savings are achieved with custom and patchwork blanks, corrosion protection is relatively expensive

Method used

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  • Process for producing components having regions of differing ductility
  • Process for producing components having regions of differing ductility
  • Process for producing components having regions of differing ductility

Examples

Experimental program
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Effect test

Embodiment Construction

[0029] The present invention provides several process options.

[0030] In process option 1, the cold-produced part consisting of joined individual plates A and B ( figure 2 ) is heated in a furnace at about 900 degrees Celsius until the larger part A has reached the austenitizing temperature in areas where it does not rest against the smaller part B.

[0031] In the region where parts A and B join, the parts have a higher mass to be heated.

[0032] This makes it possible that, due to the single sheet thickness and thus lower quality of the part, then with the same furnace dwell time, zone B of the part does not reach the austenitizing temperature, while zone A is heated to Austenitizing temperature.

[0033] The part is then cooled and press-hardened in a press-hardening mold.

[0034] After press hardening, the component has a more ductile material structure in zone B because it has not reached the austenitizing temperature in the furnace.

[0035] Depending on the sel...

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Abstract

The invention relates to a process for producing components made of sheet steel having regions of differing ductility, wherein either a component is produced from a sheet-metal blank made of a hardenable steel alloy by deep-drawing, and the deep-drawn component is then at least partially austenitized by heat treatment and then quench-hardened in a mould, or the blank is at least partially austenitized by heat treatment and is deformed in the hot state and quench-hardened at the same time or subsequently, wherein the sheet-metal blank has a zinc-based cathodic corrosion-resistant coating, characterized in that at least one further sheet applied to the blank is arranged in regions of the component having a desired, relatively high ductility, such that, during the heat treatment, the blank is heated to a lesser degree at these points than in the rest of the region.

Description

technical field [0001] The invention relates to a process for producing steel sheet parts. Background technique [0002] In automotive construction, the use of sheet metal products, preferably consisting of steel sheets / sheets, differing in thickness and material quality is on the rise. This makes it possible to reduce the weight of the body parts while at the same time adapting the materials used to their function. Body parts of this type include, for example, A, B, and C pillars, bumpers and their cross members, roof frames, side impact members, exterior body parts, and the like. [0003] In this regard, the prior art uses so-called custom blanks. These are plates made by welding together several sheet metal workpieces of the same or different sheet thicknesses and material qualities. So-called patchwork blanks are also known. These are plates of different thickness and material quality arranged parallel to each other. [0004] In a subsequent process, the plates are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/20B21D37/16B21D53/88B32B15/01C21D1/673C21D9/48
CPCB21D22/208B21D35/006B21D37/16B21D53/88B32B15/011B32B15/013C21D1/673C21D8/0494C21D9/48C21D2221/00Y10T29/49956
Inventor A.佐默D.哈特曼M.韦曼
Owner VOESTALPINE METAL FORMING
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