Rolling flat die for manufacturing a screw with groove for self-

Details Rolling flat die for manufacturing a screw with groove for self- Rolling flat die for manufacturing a screw with groove for self-

1987-07-24

1988-11-08

Crane, Daniel C.

Metal deforming

Tool and/or tool holder

Tool-comprising die plate having ribs and/or grooves

72 88, B21H 306

Patent

active

047826886

ABSTRACT:
A rolling flat die operable on a blank to produce a threaded element having self-locking threads includes a flat die moveable in a forward direction to engage the blank and form the self-locking threads on the blank. The flat die has a first section and a second section, the first section having a first plurality of first thread-forming parts having a first outer crest and a first inner root, the second section having a plurality of second thread-forming parts parallel to one another and parallel to the first thread-forming parts, each of the second thread-forming parts having a second outer crest and a second inner root. The first section of the flat die is operable to form a helical first groove on the blank and the second section of the flat die is operable to superimpose a second deeper groove over alternate first grooves such that the second deeper groove defines the flanks of a thread with the second deeper groove having a second groove pitch which is greater than that of the first groove pitch and with the outer crests of the thread having a self-locking center groove defined by the first groove.

REFERENCES:
patent: 3261043 (1966-07-01), Guthmann
patent: 3517717 (1970-06-01), Orlomoski
patent: 3854350 (1974-12-01), Bauer et al.
patent: 3872700 (1975-03-01), Matej
patent: 4050273 (1977-09-01), Tada
patent: 4353233 (1982-10-01), Chapman

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