Title:
【発明の名称】電縫溶接管の製造装置
Document Type and Number:
Japanese Patent JP3369483
Kind Code:
B2
Abstract:
A tube forming machine for making a tube from a sheet is disclosed. The forming rolls of this invention include various V-shaped rolls at least some of which are used as part of a three-point bending technique. The three-point bending technique entails the use of a V-shaped bottom roll and a narrow top roll. The sheet is shaped running the sheet through a gap between the narrow top roll and the V-shaped bottom roll. The technique allows a wide variety of tubing to be made from the same set of forming rolls, because the curvature obtained in a sheet can be varied by opening or closing the gap. A V-shaped forming roll disclosed herein is also used at a pinch roll stand with a second complementary V-shaped roll. The pinch roll stand of this invention creates an initial V-shaped sheet which facilitates the threading of the sheet at the start of a forming operation. Brimmed rolls are also disclosed. Brimmed rolls have a relatively sharp included angle, and are used to engage the edges of a sheet and to press the sheet against a single bottom roll in brimmed roll stand.
Inventors:
Yukio Kusakabe
Kazuo Ohmura
Koichi Mori
Kazuo Ohmura
Koichi Mori
Application Number:
JP23765198A
Publication Date:
January 20, 2003
Filing Date:
August 24, 1998
Export Citation:
Assignee:
Kusakabe Electric Co., Ltd.
International Classes:
B21C37/083; B21D5/12; B23K13/00; B21C37/08; (IPC1-7): B21D5/12; B21C37/08; B23K13/00
Domestic Patent References:
| JP9174165A | ||||
| JP3180213A | ||||
| JP9239448A | ||||
| JP4178222A | ||||
| JP60238037A |
Attorney, Agent or Firm:
Juichiro Yano