Pipe bending apparatus and method

Details Pipe bending apparatus and method Pipe bending apparatus and method

2006-11-07

2006-11-07

Larson, Lowell A. (Department: 3725)

Metal deforming

Process

Tube making or reshaping

C072S370220

Reexamination Certificate

active

07131312

ABSTRACT:
A pipe bending apparatus for performing a pipe bending method, wherein the method includes filling a workpiece with a liquid, pressurizing the liquid to a target pressure level, and bending the workpiece to create a bent pipe. Preferably, the pressure level is inversely proportional to the radius of the bend in the pipe. Furthermore, preferably the pressure is directly proportional to the bending angle of the pipe. Preferably, the pressure is maintained substantially at the target pressure during the bending process. Optionally, the pressure level can be increased during the bending process.

REFERENCES:
patent: 3739615 (1973-06-01), Tressel
patent: 5129247 (1992-07-01), Johnson
patent: 5263350 (1993-11-01), Crippa
patent: 5613394 (1997-03-01), Kawamura et al.
patent: 5865054 (1999-02-01), Roper
Japanese Article entitled: “Bending Method and Production System for Thin-Walled Pipe (Hydro-Bending)”, Yamaha Motor Technical Review pp. 87-96. (with English Abstract).
Japanese Article from Plant Engineer. vol. 34 No. 1, Jan. 2002. pp. 40-46.

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