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. 30, 2016
Filed:
Jan. 23, 2013
Hitachi Metals, Ltd., Minato-ku, Tokyo, JP;
HITACHI METALS, LTD., Tokyo, JP;
Abstract
Provided is a hot upset forging method enabling high shape precision to be obtained. The hot upset forging method includes inserting a workpiece (), with a bottom face diameter d and a height h satisfying h/d>3, into an insertion hole provided passing through a mold () of a height H disposed on an anvil (), and increasing the diameter of the workpiece () while decreasing the height of the workpiece () to form a forged material. The mold satisfies the following relationships (1) to (3). (1) A shape of the insertion hole and the cross-sectional shape of the workpiece are substantially similar shapes. (2) The height h of the workpiece ()≦the height H of the mold (). (3) A largest diameter dl of the workpiece, and the maximum inner diameter D of the insertion hole, in the height range of the workpiece (), satisfy dl<D≦dl×1.5.