FIELD: mills for rolling seamless tubes, namely steel seamless tubes.
SUBSTANCE: rolling mill includes predetermined number of rolls deforming outer periphery of tube or its blank and internal tool in the form of mandrel arranged coaxially relative to tube or its blank. Deformation range is created between rolls and said internal tool. Rolls and tool are suitable successively piercing tube blank and for elongating it tube. Rolls have in their both end zones at least one portion for gripping and transporting tube or its blank. Internal tool has in its axial end zone portion for piercing tube blank and cylindrical portion adjacent to said piercing portion and used for elongating tube.
EFFECT: possibility for performing combination process of piercing tube blank and elongating tube.
11 cl, 2 dwg
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Authors
Dates
2006-02-20—Published
2004-07-23—Filed