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:
Aug. 28, 2001
Filed:
Sep. 11, 1998
Mats Hallqvist, Grästorp, SE;
Volvo Aero Corporation, Trollhättan, SE;
Abstract
A method for producing rotational-symmetrical sheet metal articles with double-curved shape and varying thickness, particularly rocket nozzles, in which a number of sheet metal part-blanks in flat condition are cut to partially circular ring-like shape, whereupon said part-blanks are bent to the desired curvature and welded together to form a blank of the article for final machining. According to the invention the part-blanks are formed by welding together a number of strip-like sheet metal pieces with different thickness of material in flat condition along their straight edges in side-by-side relationship to form a sheet metal plate with a width corresponding to the whole length of the article and with stepwise decreasing thickness of material from one side to the other of said plate, whereupon this sheet metal plate is cut to the shape of a nozzle part-blank with partially circular ring-like shape, and said nozzle part-blank then is bent, and said part-blanks are welded together along their adjacent straight and non-parallel sides to the final blank of the article, which blank finally is subjected to finishing machining, if necessary.