Apparatus for bending forging artistic metallic pipes

Details Apparatus for bending forging artistic metallic pipes Apparatus for bending forging artistic metallic pipes

1998-11-17

1999-11-02

Larson, Lowell A.

Metal deforming

Tool and/or tool holder

Including flexible or yieldable tool or support

72369, B21D 915

Patent

active

059748540

ABSTRACT:
An apparatus for bending forging an artistic metallic straight pipe, wherein, a die core made from a steel rope is placed in the pipe bore, a kind of filler including plastisol is then introduced into the pipe bore till it is saturated to form a solid straight pipe. The latter is placed in an upper and a lower bendable die housing which each forms a trough, both ends of the die housings are provided with latch holes which are inserted therein with supporting axles. Polyurethane is poured into the troughs to envelop the straight pipe. Many hard bracing stubs are buried in the top/bottom of the troughs, and after heating to solidify the polyurethane, a flexible die set is formed. Both external top and bottom surfaces of the upper and lower die housings are provided thereon with a laminated spring, so that when the die set is forged, action force can be uniformly distributed to render the straight pipe to be bending forged to have the desired bending curvature. The bended solid pipe then is taken out, and the pipe bore is heated to slightly melt for taking out the plastisol in the die core. A hollow bended artistic metallic pipe thus is formed.

REFERENCES:
patent: 2989109 (1961-06-01), Heimberger
patent: 3580044 (1971-05-01), De Voss et al.
patent: 5349839 (1994-09-01), Weykamp et al.

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