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1. WO2000043143 - BENDING METHOD FOR PIPE MATERIAL

Publication Number WO/2000/043143
Publication Date 27.07.2000
International Application No. PCT/JP2000/000252
International Filing Date 20.01.2000
IPC
B21D 9/04 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
9Bending tubes using mandrels or the like
04the mandrel being rigid
B21D 9/05 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
9Bending tubes using mandrels or the like
05co-operating with forming members
CPC
B21D 9/04
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
9Bending tubes using mandrels or the like
04the mandrel being rigid
B21D 9/05
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
9Bending tubes using mandrels or the like
05co-operating with forming members
Applicants
  • SANGO CO., LTD. [JP/JP]; 3-1, Mutsuno 1-chome, Atsuta-ku Nagoya-shi, Aichi 456-0023, JP (AllExceptUS)
  • SEKIDO, Yutaka [JP/JP]; JP (UsOnly)
Inventors
  • SEKIDO, Yutaka; JP
Agents
  • ASAMURA, Kiyoshi ; Room 331, New Ohtemachi Bldg. 2-1, Ohtemachi 2-chome Chiyoda-ku, Tokyo 100-0004, JP
Priority Data
11/1263421.01.1999JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) BENDING METHOD FOR PIPE MATERIAL
(FR) PROCEDE DE PLIAGE DE TUYAUX
Abstract
(EN)
A bending method for pipe material using a conventional device such as press device, wherein, in order to prevent wall thinning and cracks, one side of a cylindrical pipe material (1) is firmly held by a first clamp (2) with the other side loosely held by a second clamp (3). The clamp (2) is moved downward in the drawing with respect to the clamp (3), with an axially pressing force applied to the pipe material (1) at the opposite ends thereof. The pipe material (1) is plastic-deformed by being guided by a 1/4 spherical surface (4a) of a core (4) and a 1/4 spherical surface (5a) of a core (5) to form linear portions at two bending portions and at an intermediate portion therebetween.
(FR)
La présente invention concerne un procédé de pliage de tuyaux utilisant un dispositif classique tel qu'une presse. Cependant, pour éviter l'amincissement et les fissures, l'une des faces d'un tuyau cylindrique (1) donné est fermement maintenue par un premier collier (2), l'autre face étant maintenue peu serrée par un second collier (3). Le collier (2) est déplacé vers le bas lors de l'étirage par rapport à l'autre collier (3), avec une force de pression axiale appliquée aux extrémités opposées du tuyau (3). On soumet ce tuyau (1) à une déformation plastique en le faisant guider par une surface ¼ sphérique (4a) d'un noyau (4) et une surface ¼ sphérique (5a) d'un autre noyau (5) pour obtenir des segments linéaires à partir de deux segments de pliage, avec un segment intermédiaire entre eux.
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