Bending method and mandrel of multi-layered pipe

Details Bending method and mandrel of multi-layered pipe Bending method and mandrel of multi-layered pipe

2006-11-07

2006-11-07

Suhol, Dmitry (Department: 3725)

Metal deforming

Process

Tube making or reshaping

C072S149000, C072S150000, C072S466200

Reexamination Certificate

active

07131313

ABSTRACT:
A method where an inside mandrel is inserted into the inner pipe of the multi-layered pipe, a tubular outside mandrel is inserted into the annular space between the inner pipe and outer pipe, the multi-layered pipe is clamped to a bending die by a clamping die, the multi-layered pipe is held at the rear of a bending portion of the multi-layered pipe by a pressure die and a crease-removing die, and the multi-layered pipe is bent by causing the clamping die to revolve around the bending die. An annular outside mandrel having at least three slits formed in the distal end thereof along generating lines is used as the outside mandrel, and the clamping die is caused to revolve around the bending die with the outside mandrel and inside mandrel protruding toward the distal end of the mutli-layered pipe from a bending start point.

REFERENCES:
patent: 3859839 (1975-01-01), Crotti
patent: 4009601 (1977-03-01), Shimizu
patent: 5333481 (1994-08-01), Spath
patent: 5749255 (1998-05-01), Arai
patent: 5937686 (1999-08-01), Arai
patent: 6941787 (2005-09-01), Flehmig et al.
patent: 2001269721 (2001-10-01), None
patent: WO 183130 (2001-11-01), None

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