Method and apparatus for producing zircaloy tubes and zircaloy t

Details Method and apparatus for producing zircaloy tubes and zircaloy t Method and apparatus for producing zircaloy tubes and zircaloy t

1979-01-26

1980-11-18

Mehr, Milton S.

Metal deforming

By use of roller or roller-like tool-element

With tool inside hollow work

72214, 72370, B21B 1706, B21B 2100

Patent

active

042338344

ABSTRACT:
Improved zircaloy tubes for PWR reactors are produced by a method and apparatus by controlling spirality, that is, the spiral formation of the wall-thickness eccentricity. In the past, that spiral formation has caused the tubes to bow during use, and the present invention permits the maintenance of that spiral formation to acceptable limits. The hollow or workpiece is positioned upon a cylindrical mandrel and is advanced step-by-step through a work zone between a pair of rolls having grooves which define the work zone. The workpiece is turned through a predetermined angle on the mandrel prior to each rocking cycle. The present invention involves controlling the angle at which the metal working forces are exerted so as to minimize the turning moment or torque effect which results in producing the spiral formation.

REFERENCES:
patent: 1960178 (1934-05-01), Albert
patent: 3487675 (1970-01-01), Edstrom et al.
patent: 3512386 (1970-05-01), Teppgard
patent: 3808864 (1974-05-01), Bennet

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