Resilient internal mandrel

Details Resilient internal mandrel Resilient internal mandrel

1983-01-26

1985-01-15

Larson, Lowell A.

Metal deforming

Process

Tube making or reshaping

72466, B21D 901

Patent

active

044932030

ABSTRACT:
An internal mandrel (10) is disclosed which is used for supporting the inner wall (30) of a pipe (12) during bending. The internal mandrel includes a urethane plug (31) which is compressed between the piston (60) of a hydraulic cylinder (56) and an end plate (36). This expands the urethane radially outward into contact with the inner wall (30) of the pipe to support the pipe during bending. Resilient steel strips (88) can be mounted on the exterior surface of the urethane plug (31) at the inside bend of the pipe to increase the effective wall thickness of the pipe at the inner bend to reduce the likelihood of deformation during bending. In a second embodiment, internal mandrel (200) includes an annular urethane plug (204) positioned between a resilient cylinder (202) and the inner wall of the pipe (12).

REFERENCES:
patent: 2971556 (1961-02-01), Armstrong et al.
patent: 3180130 (1965-04-01), Avera
patent: 3279237 (1966-10-01), Rader
patent: 3580044 (1971-05-01), DeVoss et al.
patent: 4006619 (1977-02-01), Anderson

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