Process for forming curved structures, and the resulting structu

Details Process for forming curved structures, and the resulting structu Process for forming curved structures, and the resulting structu

1981-10-28

1984-08-21

Larson, Lowell A.

Metal deforming

Process

Tube making or reshaping

72370, 72398, B21D 5110

Patent

active

044662670

ABSTRACT:
Curved metal structures such as cylinders, circumferential parts of cylinders, tubes, and circumferential parts of tubes formed from flat stock have reformed protrusions in limited areas in order more accurately to position mating parts. The flat stock is formed to its cylindrical or tubular shape with known onestroke die-mandrel techniques, and near and at the end of the forming process there also is a concurrent precision reforming of limited sections of the formed stock by localized radial thinning of the material. When precisely-located radial and axial surfaces are desired at an end of the structure, then this is done at an axial end at least by related localized elongation and cold working of material into contact with a die wall. When a precise internal surface is desired, the reforming and cold working can be done at a substantial distance from the end.

REFERENCES:
patent: 137475 (1873-04-01), Parmelee
patent: 653902 (1900-07-01), Bray
patent: 1748038 (1930-02-01), Leach
patent: 2077335 (1937-04-01), Lemming
patent: 3314266 (1967-04-01), Werther et al.

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