Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1990-03-21
1991-03-05
Combs, E. Michael
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
10 11R, 10 27R, B21K 146, B21D 1704, B21H 306
Patent
active
049968602
ABSTRACT:
A method and apparatus for manufacturing anchor bolts to be fixed on concrete structures, with the method comprising preliminarily heading a steel rod to form at an upper end thereof, a head having a tapered surface gradually tapering downwardly from the upper end and decreasing in diameter; forming the mail screw at the other end of rod by thread-rolling and simultaneously rolling a part adjacent to the head to form a rod-portion of a reduced diameter by gradually displacing a surface layer of the rod-portion inwardly and outwardly to give rise to an inner and outer transient swells respectively forming a stopper a tapered portion merging into the tapered surface of head; and loosely fitting and expansible sleeve on the rod-portion of reduced diameter, with the sleeve being made by die-cutting and bending a metal plate into a cylindrical shape of an outer diameter substantially equal to outer diameter of the screw. The apparatus includes a header forming the preliminary head, and a pair of rolling die assemblies each comprising a thread-rolling die to form the screw, a neck-rolling die combined therewith by a spacer and adapted to form the rod-portion of reduced diameter.
REFERENCES:
patent: 3044332 (1962-07-01), Siebol
patent: 4365495 (1982-12-01), Francis
patent: 4610589 (1986-09-01), Bredal
patent: 4770581 (1988-09-01), Limbrick
Combs E. Michael
Yugenkaisha Shinjo Seisakusho
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