B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
10/25, 78/29
B21D 53/24 (2006.01)
Patent
CA 1326113
ABSTRACT OF THE DISCLOSURE 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.
604041
Perrault Frederick
Perrault Raymond E.
Ridout & Maybee Llp
Whipple Patent Management Corporation
LandOfFree
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