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. 17, 1998
Filed:
Jan. 21, 1997
Junichi Shibata, Minami-ashigara, JP;
Arimichi Fukuda, Ashigawa-kami-gun, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
When a metal strip continuously fed and made of stainless-steel, an aluminum alloy or a nickel alloy is bent followed by welding opposite ends of the metal strip to form a pipe and followed by grinding the pipe, the pipe is subjected to heat treatment after the pipe has been welded and before the pipe is ground. Annealing or normalizing adaptable to the type of the metal is selected as the heat treatment. As a result, work hardening can be relieved by the above processes. Moreover, generation of magnetism attributable to martensitic transformation generated in a portion, in which bending stress is concentrated, can be prevented. Thus, work hardening due to the bending operation during the process for forming the pipe can be relieved so that the following grinding operation is performed accurately. Therefore, generation of partial magnetism due to the bending operation can be prevented so that an excellent image can be formed.