The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 2022
Filed:
Jun. 29, 2017
Voestalpine Metal Forming Gmbh, Krems an der Donau, AT;
Karl Michael Radlmayr, Steyregg, AT;
voestalpine Metal Forming GmbH, Krems an der Donau, AT;
Abstract
The invention relates to a method for internal high-pressure forming and hardening of galvanized pipes made of sheet steel in which a pre-fabricated pipe is used; the pipe has at least one inlet opening () and a cavity (); the pipe is heated to a temperature above the austenitization temperature (AC) of the respective steel alloy and after the achievement of a desired degree of austenitization, is inserted into an internal high-pressure forming tool and acted on with a pressurized medium, which is forced into the cavity () through the at least one inlet opening () until the pipe fills a predetermined mold () of the tool, characterized in that the forming tool is heated to a temperature between 400 and 650° C., in particular 450-550° C., and the pressurized medium is likewise heated and has a temperature of 400-650° C.; after the austenitization, the pipe is allowed to passively cool or is actively cooled to a temperature of 400-600° C., but a temperature above the martensite starting temperature (Ms) of the selected steel alloy, and the cooling of the pipe for hardening purposes only takes place after the removal from the mold.