To provide a method for machining a material tube capable of reducing man-hour for work and improving work efficiency by eliminating welding connection or minimizing it, and also to provide a machining apparatus, and further to provide a work tube.
An apparatus for machining the material tube includes: a sealing tool water supplying machine 22 for mounting sealing tools at both the ends of the material tube having a first diameter and supplying liquid into the material tube; a hydrobending device 23 for bending the material tube to a bent tube while regulating the pressure of the internal liquid; a hydroforming device 24 for increasing pressure by further supplying the liquid into the bent tube at a state of mounting the sealing tools at both the ends of the bent tube and sealing the liquid therein and expanding a part of the bent tube till a second diameter to form a bent diameter expansion tube; and a sealing tool opening and water discharging machine 25 for discharging the liquid in the bent diameter expansion tube and removing the sealing tools.
SUZUKI HIDEHIKO
YAMAMURA YASUMI
JPH057779A | 1993-01-19 | |||
JPH0284219A | 1990-03-26 | |||
JPS63256226A | 1988-10-24 | |||
JPS61262430A | 1986-11-20 | |||
JP2004283893A | 2004-10-14 | |||
JP2007209998A | 2007-08-23 | |||
JP2002219526A | 2002-08-06 |
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