Metal deforming – Process – Deforming sheet metal
Patent
1988-06-10
1989-08-29
Larson, Lowell A.
Metal deforming
Process
Deforming sheet metal
72404, 10152R, B21D 5324
Patent
active
048605700
ABSTRACT:
This invention provides a method for producing an internally threaded part through a stamping operation in one embodiment of which a die is provided with a curvature greater than that of the completed part. A punch is provided having ridges thereon collectively complementary in cross section to a thread to be produced and of a curvature slightly less than that of said cavity in said die, and a workpiece is engaged by said punch so as to force it against the die and form grooves in the workpiece the full depth of the thread to be produced, after which the workpiece is given a cylindrical shape, bringing the ends of the grooves into registry so as to provide an internally threaded part. Only a single stroke normally is required in forming the grooves. In another embodiment, a sheet metal workpiece is engaged by a punch having curved convex protrusions defining a plurality of ribs and a die having a cavity with a curved convex surface so as to provide grooves therein from the ribs, the workpiece then being engaged again by at least one additional similar punch and die so as to extend the grooves, the workpiece finally being shaped to a cylindrical form so that the grooves provide a screw thread. The cross-sectional dimension of the grooves may be increased by successive punches.
REFERENCES:
patent: 139861 (1873-06-01), Boeklen
patent: 161912 (1875-04-01), Taplin
patent: 256525 (1882-04-01), Whiting
patent: 322052 (1885-07-01), Emery
patent: 322053 (1885-07-01), Emery
patent: 357768 (1887-02-01), Furbish
patent: 463445 (1891-11-01), Densmore
patent: 468293 (1892-02-01), Coleman
patent: 708932 (1902-09-01), Smith
patent: 1111749 (1914-09-01), Joseph
patent: 1271070 (1918-07-01), Palecheck
patent: 1433882 (1922-10-01), Fancher et al.
patent: 1465484 (1923-08-01), Richter
patent: 1611942 (1926-12-01), Persons
patent: 1676919 (1932-09-01), Persons
patent: 1876386 (1932-09-01), Baynes
patent: 1919940 (1933-07-01), Hall
patent: 1949618 (1934-03-01), Mollberg
patent: 1957530 (1934-05-01), Dibner
patent: 1994428 (1935-03-01), Keil
patent: 2064342 (1936-12-01), England
patent: 2153388 (1939-04-01), Newman
patent: 2271762 (1942-02-01), Draper
patent: 2429910 (1949-01-01), Alvin
patent: 2441580 (1948-05-01), Mageoch
patent: 2826810 (1958-03-01), Peterson
patent: 2862215 (1958-12-01), Gross
patent: 3006003 (1961-10-01), Johnson, Jr.
patent: 3056197 (1962-10-01), Lawson
patent: 3086421 (1963-04-01), Hamman
patent: 3665881 (1972-05-01), Koch et al.
patent: 4266310 (1981-05-01), Perrault et al.
Perrault Frederick
Perrault Raymond E.
Larson Lowell A.
Whipple Patent Management Corporation
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