MANUFACTURING METHOD OF METAL CYLINDER BODY

Japanese Patent JP2018030145

A

PROBLEM TO BE SOLVED: To provide a manufacturing method of a new metal cylinder body capable of highly accurately setting inner and outer diameters of the metal cylinder body when manufacturing the metal cylinder body according to press bending working of a metal blank sheet.SOLUTION: A manufacturing method of a metal cylinder body 10 includes: a process (a) of performing press working of a metal blank sheet 12 of a flat plate shape to obtain a belt-like body 20 provided with overlapped parts 14a, 14b on both ends thereof; a process (b) of forming a concave part 24 and a convex part 26 which are engaged to each other on the overlapped parts 14a, 14b at the same time while overlapping the overlapped parts 14a, 14b and retaining the belt-like body 20 into a target diameter size; and a process (c) of joining the overlapped parts 14a, 14b of the belt-like body 20 by abutting welding electrodes 32, 34 on an engaged part of the concave part 24 and the convex part 26, pushing a metal core 38 of the welding electrode 32 against the convex part 26 and performing welding while engaging the concave part 24 and the convex part 26 to each other and retaining the belt-like body 20 into the target diameter size, the welding electrode 32 being provided with the metal core 38 which is harder than a circumference 36 on a tip center part.SELECTED DRAWING: Figure 7

KOSUGE HIROYOSHI

JP2016163385A

March 01, 2018

August 24, 2016

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KOKUBU PRESS KOGYO KK

B21D51/18; B21D19/00; B21D39/03; B23K11/02; B23K11/30; B23K11/34

JP2005169401A	2005-06-30
JP2000260599A	2000-09-22
JPH09234511A	1997-09-09
JPS58107229U	1983-07-21
JP2010260088A	2010-11-18

Kasai Nakane International Patent Office
Yoshitaka Kasai
Nakane Mie

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