Method for Contactlessly Cooling Steel Sheets and Device Therefor

A method for producing a hardened steel component in which a sheet blank is stamped out and the stamped sheet blank is heated to a temperature ≥Ac3 and as needed, is kept at this temperature for a predetermined time in order to carry out the austenite formation and then the sheet blank, which has be...

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Bibliographische Detailangaben
Hauptverfasser:	Tutewohl, Benedikt, Brummayer, Markus, Etzelsdorfer, Kurt, Sommer, Andreas, Kelsch, Reiner
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS BLASTING CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS FURNACES GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL KILNS LIGHTING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL ENGINEERING METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS OVENS RETORTS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS
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Beschreibung
Zusammenfassung:	A method for producing a hardened steel component in which a sheet blank is stamped out and the stamped sheet blank is heated to a temperature ≥Ac3 and as needed, is kept at this temperature for a predetermined time in order to carry out the austenite formation and then the sheet blank, which has been heated all over or only in some regions, is transferred to a forming die, is formed in the forming die, and in the forming die, is cooled at a speed that lies above the critical hardening speed and is thus hardened or else the sheet blank is completely cold formed and the formed sheet blank is heated all over or only in some regions to a temperature >Ac3 and as needed, is kept at this temperature for a predetermined time in order to carry out the austenite formation and then the sheet blank, which has been heated and formed all over or only in some regions, is transferred to a hardening die, and is hardened in the hardening die at a speed that lies above the critical hardening speed; the steel material is adjusted in a transformation-delaying way so that at a forming temperature that lies in the range from 450° C. to 700° C., a quench hardening takes place through the transformation of the austenite into martensite; after the heating and before the forming, an active cooling takes place in which the sheet blank or parts of the sheet blank is/are cooled at a cooling speed of >15 K/s; for the homogeneous, contactless cooling of hot sheet blanks or components, a cooling apparatus and an article with a hot surface are moved relative to each other; the cooling apparatus has at least two cooling blades or cooling columns that are parallel to and spaced apart from each other; oriented toward the sheet blank to be cooled or the component to be cooled, the cooling blades or cooling columns have a nozzle edge with nozzles; the nozzles direct a cooling fluid at the surface of the sheet blank or the component and after the cooling fluid contacts the hot surface, it flows away in the space between the blades or cooling columns.