Cold forging mandrel with threads

Details Cold forging mandrel with threads Cold forging mandrel with threads

B - Operations, Transporting

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B21J 7/02 (2006.01) B21C 37/15 (2006.01) B21C 37/20 (2006.01) B21J 5/12 (2006.01) B21J 13/00 (2006.01) B21K 1/56 (2006.01)

Patent

CA 1169273

F?RENADE FABRIKSVERKEN "Cold forging mandrel with threads". A b s t r a c t A mandrel for the production of internally threaded tubes or cylin- ders by the cold forging of a forging blank (3) around an externally threa- ded 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 % or 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. (Figure 2 is recommended for publication)

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