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. 31, 2020
Filed:
Mar. 08, 2016
Nippon Steel & Sumikin Stainless Steel Corporation, Tokyo, JP;
Shuji Yamamoto, Tokyo, JP;
Junichi Hamada, Tokyo, JP;
Atsuhisa Yakawa, Tokyo, JP;
Mitsuhiro Fujinaga, Tokyo, JP;
Abstract
A method of increasing the thickness of a tube which increases a thickness of an end part of a tube without a burr being formed, comprising placing a tubebetween a dieand mandrelin the state with a space for increasing the thickness between a small diameter partof the mandreland a first end partof a tubeand between a large diameter hole partC of the dieand a second end partof the tube, using a first upsetting punchand a second upsetting punchto respectively process the first end partand the second end partof the tube, pulling out the mandrelfrom the tubein the state with the second upsetting punchconstraining the second end partof the tube, and using the first upsetting punchto push up the first end partof the tubeto take out the tubefrom the die