Method of manufacturing a thread-forming screw

Details Method of manufacturing a thread-forming screw Method of manufacturing a thread-forming screw

1986-08-26

1988-02-16

Combs, E. Michael

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

10 10R, B21H 302, B21K 156

Patent

active

047246944

ABSTRACT:
A method is disclosed of manufacturing a thread forming screw with a constant diameter helical screw thread and lead-in threads having a plurality of sharp crests and intermediate relief concave areas. The method includes the steps of forcing a cylindrical wire into a die to form on a distal end of the wire a plurality of longitudinally extending ribs spaced from each other by reduced diameter cylindrical portions. The distal end is rolled between tapered thread sections of a die set to taper the distal end and to form the lead-in threads with sharp crested lobes and intermediate relief areas while the constant diameter helical screw thread is also being formed by the die set.

REFERENCES:
patent: 2309053 (1943-01-01), Farrell
patent: 3104161 (1963-09-01), Carlson
patent: 3180126 (1965-04-01), Carlson
patent: 3209383 (1965-10-01), Carlson
patent: 3461470 (1969-08-01), Cochrum
patent: 4368552 (1983-01-01), Sugiyama
patent: 4584247 (1986-04-01), Mulholland

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