Truncated through feed thread rolling die for rolling flat rooted threads

Abstract

Abstract A THROUGH FEED THREAD ROLLING DIE WHICH ACTING IN COOPERATION WITH ONE OR MORE IDENTICAL DIES WILL PRODUCE SO CALLED ACME OR SIMILAR THREADS ON A WORK PIECE. THE THREADS ON THE RELIEVED STARTING SECTION IN WHICH THE ROOT DIAMETER IS CONSTANT HAVE A NOVEL CONSTANTLY CHANGING CROSS SECTION. THE CRESTS OF THE THREADS CONSIDERED IN LONGITUDINAL SECTION ARE FLAT AND LIE IN THE SURFACE OF A TRUNCATED CONE. THE FLANKS OF THE THREADS THAT FIRST CONTACT THE WORK ARE AT A RELATIVELY WIDE ANGLE SO THAT GOOD STARTING THREAD FORMATION IS PRODUCED IN THE WORK. AS THE THREAD ON THE DIE INCREASES IN DIAMETER, THE FLANKS ASSUME A DUAL ANGULARITY WITH THE WIDE ANGLED FLANKS MERGING WITH STEEP INNER FLANKS. WHEN THE TAPERED STARTING RELIEF SECTION REACHES THE FULL DIAMETER INTERMEDIATE DWELL SECTION, THE WIDE ANGLED FLANKS WILL HAVE GRADUALLY DISAPPEARED TO BE REPLACED BY THE STEEP FLANKS OF ACME CONFIGURATION.

Inventors

• 👤 Elmer S Zook
• 👤 Paul W Ronn

Bibliographic Details