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:
Apr. 25, 1978
Filed:
Dec. 09, 1976
Robert Lugosi, Monroeville, PA (US);
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Abstract
A method and an apparatus for manufacturing elongated, hollow bodies of rectangular cross section by means of hydrostatic extrusion. The method and apparatus utilize a mandrel and billet of novel construction. The mandrel cooperates with a die and has a forming tip comprising a cylindrical portion, a transition portion, and a rectangular portion. The transition portion provides a tapered surface which extends from the cylindrical portion to the rectangular portion. The billet has a leading end which is extruded first and which has a simple geometry comprising two tapered surfaces situated axially adjacent to each other and being of different taper. The billet has an axially extending hole through which the mandrel is inserted. Due to their construction and relative positioning, a hydrostatic seal is provided between the billet's leading end and the die and between the mandrel and an inner wall of the billet which bounds its axially extending hole. The uniform flow between the mandrel and die during extrusion yields a hollow, elongated product of rectangular shape whose corners are free of folds and other metal forming defects. Thus, this method and the apparatus for performing the method enables one step hydrostatic extrusion of hollow, elongated bodies of rectangular cross section with the advantages of providing excellent extrusion lubrication and complete hydrostatic sealing between the die, billet, and mandrel.