METHOD FOR MOLDING CYLINDRICAL BODY HAVING TAPERED PART

WIPO Patent Application WO/2023/105883

A1

In this method for molding a cylindrical body having a tapered part by pushing a cylindrical element tube into a die hole formed in a die by a metal core, an outer diameter increasing part formed on a distal end of the metal core presses the inner side of an end of the element tube to expand the diameter on the proximal end side of the element tube, and also presses an end of the element tube with a step part formed on the proximal end side of the outer diameter increasing part of the core metal to push the end into a small inner diameter part through an inner diameter decreasing part of the die hole, thereby shrinking the distal end side of the tube. By forming a small diameter part by decreasing the diameter of the element tube while compressing the element tube by pressing in the axial direction, it is possible to solve the aforementioned problem. The foregoing provides a method for molding a cylindrical body having a tapered part, which can be carried out via plastic processing, regardless of the size of the wall thickness of the element tube, while mitigating an increase in the set number of dies and an increase in work steps.

TAKAI RYUTA (JP)
KAWABATA DAIKI (JP)
KAKUDA TSUKASA (JP)

PCT/JP2022/034792

June 15, 2023

September 16, 2022

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SANGO CO LTD (JP)

B21D41/04; B21D22/28; B21D41/02

CN112427559A	2021-03-02
JPS5086468A	1975-07-11
JP2014133260A	2014-07-24
JP2006205232A	2006-08-10
JP2014018801A	2014-02-03
JPS63119938A	1988-05-24
CN104889274A	2015-09-09

PROSPEC PATENT FIRM (JP)

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