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:
Mar. 22, 2022
Filed:
Feb. 20, 2018
Nippon Steel Corporation, Tokyo, JP;
Shohei Tamura, Tokyo, JP;
Hidehiro Arita, Tokyo, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
A mandrelfor producing a thin-walled bent tube having a bending portion with high strength and a small radius of curvature by rotary draw bending without either cracks in an outside of bend or winkles and buckling in an inside of bend occurring includes a shank, a connection mechanismand a mandrel ball. In a cross-section orthogonal to an axial direction of the mandrel ballat a central position in the axial direction of the mandrel ball, the mandrel ballhas a first positionand a second positionat which a first straight line m that passes through a mandrel ball centermeets an outer peripheryof the mandrel ball. Further, a ratio (L/L) between a dimension Lfrom the mandrel ball centerto the first positionand a dimension Lfrom the mandrel ball centerto the second positionis in a range of 0.915 to 0.976.