Patent ID: 6116071
Filing Date: 2000-09-12
Classification: B21B

Abstract:
A rolling mill for reducing a diameter of tubes or cylindrical bodies in general to a final dimension in the iron and steel industries, comprising:a first multiplicity of fixed-type sizing rolling units arranged in line along a rolling axis and each comprising a supporting structure, at least three rolls rotatably supported in the structure about respective axes of rotation extending transversely to the rolling axis, said rolls being kinematically connected to each other so that said rolls are set in rotation simultaneously by starting only one of said rolls, said rolls rolling the tube or the cylindrical body to obtain a first diameter reduction thereof to a value close the final dimension;a second multiplicity of adjustable-type sizing rolling units arranged in line along a rolling axis downstream of the fixed-type rolling units and each comprising a supporting structure, at least three driven rolls rotatably supported in the structure about respective axes of rotation extending transversely to the rolling axis, means for adjusting the distance between the axes of rotation of the rolls and the rolling axis during the working of a tube or cylindrical body, said rolls of the adjustable-type sizing rolling units rolling the tube or the cylindrical body to obtain a second diameter reduction thereof within required processing tolerances.