Mandrel mill and method of tube rolling by using the same

Mandrel mill and method of tube rolling by using the same

  • CN 1,129,154 A
  • Filed: 09/04/1995
  • Published: 08/21/1996
  • Est. Priority Date: 09/05/1994
  • Status: Abandoned Application
First Claim
Patent Images

1. the seamless pipe mill of core rod type has machine row that comprise a plurality of concave roll frames, by making the hollow ingot pipe through the milling train row, extends and the rolling hollow ingot pipe that has an insertion plug, comprising:

  • One is used for swedged first four-roll rack, and this four-roll rack is arranged as first frame of machine row and only is used to reduce the hollow ingot external diameter of pipe;

    One is used to eliminate the second even four-roll rack of wall unevenness, and this four-roll rack is aligned to the final stage frame of machine row and is used to eliminate the hollow ingot pipe even at the wall unevenness of circumferencial direction;

    One two roller frame section is arranged between described first four-roll rack and described second four-roll rack and is used to reduce the wall thickness of hollow ingot pipe.

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