Title:
METHOD AND DEVICE FOR BENDING STOCK TUBE
Document Type and Number:
Japanese Patent JP2004283893
Kind Code:
A
Abstract:
To enhance the working efficiency by reducing the working man hour.
In a bending method of a stock tube 30 for bending a middle portion of one stock tube 30 at a plurality of points while both ends of the stock tube 30 are sealed with seal plugs 31 and 32, and the stock tube 30 is filled with liquid, the internal pressure of the stock tube 30 can be controlled via the seal plugs, and the pressure in the stock tube 30 is adapted to each of the bending at the plurality of points. Before the next bending step is started after one bending is completed, the pressure in the stock tube 30 which is adapted to one bending is regulated to the pressure adapted to the next bending.
Inventors:
YOSHINO TAMIO
TASHIRO YOJI
RACHI MAMORU
TASHIRO YOJI
RACHI MAMORU
Application Number:
JP2003081633A
Publication Date:
October 14, 2004
Filing Date:
March 24, 2003
Export Citation:
Assignee:
YAMAHA MOTOR CO LTD
International Classes:
B21D9/15; B21D7/025; B21D53/84; (IPC1-7): B21D9/15; B21D7/025
Attorney, Agent or Firm:
Toshio Tsuruwaka