Method for hot or warm forming a workpiece and production plant for hot or warm forming a workpiece
a technology of workpiece, which is applied in the direction of heat treatment equipment, furnaces, cleaning using liquids, etc., can solve the problems of reducing the quality of fabricated semi-fabricated pieces, unable to completely remove residues, and unable to avoid contamination with dust or the like, so as to achieve the effect of improving the quality of the piece fabricated by hot or warm forming
Inactive Publication Date: 2017-11-09
THYSSENKRUPP STEEL EURO AG +1
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- Abstract
- Description
- Claims
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Benefits of technology
The present invention improves the quality of hot or warm formed workpieces beyond what was previously achievable.
Problems solved by technology
In addition, a contamination with dust or the like, especially in a coil or sheet warehouse, can likewise hardly be avoided as a rule.
As a result of this thermal decomposition, contaminants remain on the semifabricated piece, which in turn reduce the quality of the fabricated semifabricated piece.
A mechanical cleaning, such as by shot blasting, cannot always entirely remove the residues which occur, or it may in particular impair semifabricated pieces which are coated.
Furthermore, large oil residues, such as those due to a large oil film, may lead to an intensified hydrogen absorption in the material during the processing of the semifinished piece.
This may result in material embrittlement on account of the high strength.
In the case of a micro-oiling, this behavior is not found, but then no adequate corrosion protection can be assured.
Method used
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[0025]In the various figures, the same parts are always provided with the same reference number and therefore as a rule will respectively only be mentioned or designated once.
[0026]FIGS. 1a to 1d represent a method for hot or warm forming of a workpiece 1 according to a sample embodiment of the present invention. For example, this involves a structural or chassis part of a motor vehicle, the workpiece 1 being provided as a semifabricated part, especially in the form of a tailored rolled blank or a metal sheet as shown in FIG. 1. The workpiece 1 consists, for example, of a material fabricated at least partially from a boron-manganese steel, especially 22MnB5. Thanks to the hot or warm forming, it is preferably provided that the workpiece 1 is converted into its final form as a component part. In order not to influence the properties and / or the form of the component fabricated afterwards, the workpiece 1 is subjected to a pretreatment. One example of such a pretreatment is the coating...
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Abstract
A method for hot or warm forming a workpiece may comprise providing the workpiece to be formed, at least partially pretreating the workpiece, at least partially heating the workpiece to a target temperature, and at least partially forming and / or hardening the workpiece. Furthermore, the workpiece may be at least partially cleaned in a cleaning step between the pretreating and the heating of the workpiece. In some examples, at least partially cleaning the workpiece may involve brushing the workpiece, using a cleaning bath, or heating the workpiece with a first burner to a cleaning temperature. Further, one or more burners used to heat or clean the workpiece may be operated with a fuel gas and / or an oxygen-containing gas.
Description
PRIOR ART[0001]The present invention concerns a method for hot or warm forming of a workpiece and a production plant for hot or warm forming of a workpiece.[0002]In hot and warm forming, uncoated or coated materials are generally used. To avoid corrosion during transport, a semifabricated piece in the form of a coil or a sheet can be provided partially, preferably entirely, with a corrosion protection oil or with lubricants. In addition, a contamination with dust or the like, especially in a coil or sheet warehouse, can likewise hardly be avoided as a rule.[0003]Caused by thermal processes which occur upon reaching the desired temperature for the tempering process, a thermal decomposition of the substances which have been deposited on the semifabricated piece occurs. As a result of this thermal decomposition, contaminants remain on the semifabricated piece, which in turn reduce the quality of the fabricated semifabricated piece. A mechanical cleaning, such as by shot blasting, canno...
Claims
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IPC IPC(8): C21D9/46C21D1/18C21D1/72C23C22/73
CPCC21D9/46C23C22/73C21D1/18C21D1/72B08B1/00B08B3/10B08B1/12
Inventor BANIK, JANKOSIKORA, SASCHA
Owner THYSSENKRUPP STEEL EURO AG