Side rail and method for producing a hot-formed and press-hardened side rail

a side rail and press-hardening technology, which is applied in the field of side rails, can solve the problems of increasing the production cost of vehicles produced in large quantities, increasing the production cost of vehicles, and high material cost, so as to reduce the weight of the automobile body, reduce the weight of the body, and minimize the effect of fuel consumption and co2 emission

Inactive Publication Date: 2012-12-20
BENTELER AUTOMOBILTECHNIK GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]According to one advantageous feature of the present invention, the transition region is smaller than 50 mm, preferably smaller than 30 mm and still more preferably smaller than 20 mm. Because the transition region is very small, the component can within the context of the invention be specifically adjusted in a single production step, namely the production process itself, so that the required crash properties can be reliably implemented with the current manufacturing tolerances, while simultaneously having improved manufacturability.
[0051]According to another advantageous feature of the method of the present invention, the intermediate cooling of the region of the first type may be performed in the press-hardening tool, for example with cooling plates arranged in the press-hardening tool. This reduces the cycle times and also the production costs. In particular, an automobile component having a region of different strength is produced with only two tool steps. Initially, heat-up is performed in a furnace system, followed by a combination of intermediate cooling and hot-forming and press-hardening using only a single tool.

Problems solved by technology

However, the aforementioned approaches are both associated with high material costs, which in turn increases the vehicle production costs of models produced in large quantities.
However, the additional heat-posttreatment once more increases the production costs due to significantly higher tooling costs up to the start of the series production.

Method used

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  • Side rail and method for producing a hot-formed and press-hardened side rail
  • Side rail and method for producing a hot-formed and press-hardened side rail
  • Side rail and method for producing a hot-formed and press-hardened side rail

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first embodiment

[0065]In the illustrated exemplary embodiment, three different curves for the different cooldown processes are shown. Curve K1 shows the course of the temperature for a first region according to the invention, wherein this region is first heated to a temperature above the AC3 temperature. From this temperature, the material is cooled down to an intermediate temperature of about 520° C. with a cooldown speed which in this case is greater than the upper critical cooldown speed oK for the bainite formation of the illustrated material. When the cooldown temperature of the intermediate cooling of about 520° C. is reached, the first region is held substantially isothermally at a temperature for the time ti. The temperature thereby decreases from about 520° C. to about 480° C. due to heat loss in form of, for example, heat radiation, convection or heat conduction. An austenitic structure is produced at the time Z1 of the intermediate cooling, and a bainitic-austenitic mixed structure is pr...

second embodiment

[0067]the method according to the invention is illustrated with the cooldown sequence according to curve 2 of the first region. The cooldown sequence of the curve 2 is similar to the cooldown sequence of the curve K1, wherein the cooldown temperature is held for a longer time from a time Z2 (equal to Z1), so that the press-hardening process starts at a time P2. The time interval t2 is therefore greater than t1. The structure in the first region is completely transformed to bainite at the time P2 and therefore does not undergo any further structural transformation after the time P2 due to the cooldown speed.

[0068]In a third embodiment according to the present invention, a cooldown speed from a temperature above the AC3 temperature according to curve 3 is selected, so that a transformation occurs directly into the bainitic intermediate structure during the cooldown process of the intermediate cooling. In the first region, an austenitic-bainitic intermediate structure was adjusted, so ...

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Abstract

A side rail and to a method for producing a side rail are disclosed. The side rail has a region of a first type and a region of a second type which have mutually different strengths. A transition region having a width of less than 50 mm is formed between the two regions. The side rail has in the region of the first type a bainitic structure and in the region of the second type a martensitic structure.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS[0001]This application claims the priority of German Patent Application, Serial No. 10 2010 048 209.9, filed Oct. 15, 2010, and European Patent Application Serial No. 11 155 717.9, filed Feb. 23, 2011, pursuant to 35 U.S.C. 119(a)-(d), the content of which is incorporated herein by reference in its entirety as if fully set forth herein.[0002]This is one of two applications both filed on the same day. Both applications deal with related inventions. They are commonly owned and have the same inventive entity. Both applications are unique, but incorporate the other by reference. Accordingly, the following U.S. patent application is hereby expressly incorporated by reference: “AUTOMOBILE COLUMN AND METHOD FOR PRODUCING A HOT-FORMED AND PRESS-HARDENED AUTOMOBILE COLUMN”.BACKGROUND OF THE INVENTION[0003]The present invention relates to a side rail, produced by hot-forming and press hardening. The present invention also relates to a method for produci...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C21D8/00C22C38/00
CPCB62D25/08C21D8/005C21D1/673C21D8/0205C21D8/04C21D2211/002C21D2211/008C21D2221/00C22C1/02C22C38/02C22C38/04C22C38/06C22C38/14C22C38/32B62D25/04C21D1/20
Inventor ZIMMERMANN, ANDREASDINGEMANS, JANPELLMANN, MARKUSBOKE, JOHANNES
Owner BENTELER AUTOMOBILTECHNIK GMBH
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