Method of forming through-feed cylindrical thread rolling dies

Details Method of forming through-feed cylindrical thread rolling dies Method of forming through-feed cylindrical thread rolling dies

1981-10-26

1983-10-11

Schmidt, Frederick R.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51 95TG, 76101B, 72104, B23G 136

Patent

active

044084188

ABSTRACT:
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.

REFERENCES:
patent: 1702160 (1929-02-01), Hanson
patent: 3023546 (1962-03-01), Beck
patent: 3347114 (1967-10-01), Van Vleet
patent: 3561171 (1971-02-01), Van Vleet
patent: 3651678 (1972-03-01), Zook et al.
patent: 4119079 (1978-10-01), Junker

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