Title:
METHOD FOR MANUFACTURING EXTENSION PART INTEGRATED CYLINDRICAL MEMBER, AND THE EXTENSION PART INTEGRATED CYLINDRICAL MEMBER
Document Type and Number:
Japanese Patent JP2023029152
Kind Code:
A
Abstract:
To provide an extension part integrated cylindrical member in which a noncylindrical extension part integrally formed in a hollow trunk has a three-dimensional shape, and a method for manufacturing the same.SOLUTION: A method for molding an extension part integrated cylindrical member in which a cylindrical trunk and a noncylindrical extension part are integrally formed comprises at least: a first step of forming a U groove roughly U-shaped in section on the center of a trunk forming scheduled part of a plate material and first flat plate parts on both sides thereof in a longitudinal direction, and forming a three-dimensionally shaped first extension part connected to the trunk forming scheduled part to provide a first intermediate member; a second step of additionally molding the first extension part of the first intermediate member to provide a second intermediate member having a second extension part; a third step of bending the end of a first flat plate part of the second intermediate member to form a bent part and a second flat plate part parallel to the U groove, thereby providing a third intermediate member; and a fourth step of rounding the second flat plate part and the bent part of the third intermediate member to form a trunk of a closed section. Each step is carried out through press-machining.SELECTED DRAWING: Figure 5
Inventors:
OKAJIMA REISHI
KAGITANI JIRO
KAGITANI JIRO
Application Number:
JP2021153651A
Publication Date:
March 03, 2023
Filing Date:
August 19, 2021
Export Citation:
Assignee:
SANGO CO LTD
International Classes:
B21D5/01; B21D51/10; B21D22/20; B21D22/26
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