Method of and apparatus for bending a double pipe

Details Method of and apparatus for bending a double pipe Method of and apparatus for bending a double pipe

1976-01-21

1977-03-01

Spicer, Jr., Robert L.

Metal deforming

Process

Tube making or reshaping

72150, B21D 904

Patent

active

040096017

ABSTRACT:
A method of and apparatus for bending a double pipe comprising inserting a smaller diameter pipe into a pipe of larger diameter and coupling the two pipes together at one end, inserting a inner metal core and an outer metal core respectively into the inside of the inner pipe and between the inner and outer pipes, inserting the double pipe into a bending mold, fixing the pipe on a turntable on which the bending mold is rigidly affixed, fixing a section of the double pipe near the end into which the metal cores were inserted thus blocking movement of the fixed section in the radial direction, and driving the turntable in a radial direction while keeping the metal cores in a fixed position and applying a bending force on the double pipe toward the bending mold while pushing the inner pipe in an axial direction from the end into which the metal core was inserted.

REFERENCES:
patent: 3546917 (1970-12-01), Paine

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