CORE BAR STRUCTURE OF DOUBLE-TUBE BENDING DEVICE

Japanese Patent JP2004098080

A

To eliminate bending defects by wrinkles of the inner tube at the time of bending a double-tube.

An end section of the double-tube composed of an inner tube 2a and an outer tube 2b is pinched by a rotatable bender and a revolvable closed die which rotates around the bender, and a bending mechanism 3 to bend the double-tube 2 by revolutionizing the closed die, an outer core bar 41 provided between the inner tube 2a and the outer tube 2b of the double-tube 2, an inner core bar 43 provided inside the inner tube 2a of the double-tube 2, an core bar shaft 47 to press the double-tube 2 provided with the outer core bar 41 and the inner core bar 43 to the bending mechanism are provided and reduction of the diameter is admitted to the outer core bar 41 in accordance with the power given at the time of bend-deforming the double-tube 2 and a split slot is so designed as to shorten the clearance gap between the inner tube 2a and the inner core bar 43, and the inner tube 2a and the outer core bar 41.

JP5209464	Equipment for freeform bending of longitudinal profiles (particularly pipes) and composite equipment for freeform bending and draw bending of longitudinal profiles (particularly pipes)
JP2009241145	METHOD OF MANUFACTURING DOUBLE PIPE HAVING BENT PART AND DOUBLE PIPE HAVING BENT PART

HATANO YASUJI

JP2002259961A

April 02, 2004

September 05, 2002

Click for automatic bibliography generation  

CALSONIC KANSEI CORP

B21D9/00; B21D7/025; B21D9/05; B21D53/84; (IPC1-7): B21D9/00; B21D7/025; B21D9/05

Masamichi Ayata
Satoru Asakura
Sadaaki Imamura
Eiichi Sakamoto

Previous Patent: MACHINING HEAD OF LASER BEAM MACHINE

Next Patent: WELDING METHOD AND MANUFACTURING METHOD OF METAL CAN