B - Operations – Transporting – 21 – H
Patent
B - Operations, Transporting
21
H
10/30
B21H 3/00 (2006.01) B21H 3/04 (2006.01)
Patent
CA 1159204
THROUGH-FEED CYLINDRICAL THREAD ROLLING DIES AND METHOD OF FORMING SAME ABSTRACT OF THE DISCLOSURE A cylindrical through-feed thread rolling die having a tapered lead-in portion, a cylindrical dwell portion, and a tapered exit portion is disclosed. Such die provides uniform spacing between the crests of the thread forms thereon throughout the lengths of the die. The spacing between the roots of the die is uniform except at the junction between the dwell portion and the two tapered end portions, where a larger spacing exists between the roots of adjacent thread forms. Because the crest spacing on the thread forms of the die is uniformly maintained throughout the length of the die, excessive pressures do not exist at the junction between the dwell portion and the two end tapers, and drunken threads on the workpiece being rolled are virtually eliminated.
364996
Colt Industries Operating Corp.
Macrae & Co.
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