Cold forging mandrel with threads

Details Cold forging mandrel with threads Cold forging mandrel with threads

1982-01-22

1984-01-31

Husar, Francis S.

Metal deforming

Tool and/or tool holder

Having unitary tool-face

72370, 72398, 72209, 10152R, B21J 1302

Patent

active

044282222

ABSTRACT:
A mandrel for the production of internally threaded tubes or cylinders by the cold forging of a forging blank (3) around an externally threaded mandrel (2). The mandrel is formed with a conicity of 0.2-1.0% or preferably 0.4-0.7% and the flanks of the mandrel's threads can be ground so that the thread width is least at the mandrel's narrow end. The reduction of flank width can be 0.1-0.4% of preferably 0.2-0.3% for a length unit of the mandrel with the above named conicity. Preferably even the inner diameter of the mandrel's thread is made 0-0.5% less than the required inside diameter in the tube's or cylinder's thread.

REFERENCES:
patent: 3656197 (1972-04-01), Van Vleet

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