Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1999-03-04
2000-07-18
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
B21B 1904
Patent
active
060890665
ABSTRACT:
A process for producing a hollow billet for producing tubing for antifriction bearings includes massively reducing a bloom in a three-roll rotary piercing mill and subsequently piercing the reduced bloom in a three-roll rotary piercing mill. The reducing and piercing may be performed in one-pass through the three-roll rotary piercing mill. The reducing and piercing steps may also be performed in separate passes through the same mill or through two separate mills.
REFERENCES:
patent: 3550415 (1970-12-01), Tarenskeen
Cernuschi Ettore
Kulessa Gerhard
Leisten Thomas
Pietsch Jurgen
Randerath Walter
Larson Lowell A.
Mannesmann AG
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