Italimpianti of America, Inc.

Italimplanti of America, Inc.

William Rozmus

Rudy M Trbovich

Mario Ricci

An apparatus for axially adjusting a bottom work roll of a plug mill to align the grooves of the top and bottom rolls. The apparatus includes a bottom roll chock having a pair of laterally extending members, each carrying a transverse, tapered wing shaped end portion. A pair of spaced apart adjustment assemblies are mounted on the plug mill housing adjacent the lower roll chock. A pair of tapered wedges is carried by each of the adjustment assemblies. The wedges are adapted to slideably engage and move the tapered wing shaped portions of the lower roll chock. A segmented tie bar having a manually rotatable turnbuckle is rigidly attached to lever arms carried by the adjustment assemblies. Rotation of the turnbuckle, which carries conventional left hand and right hand threads, causes identical outward or inward movement of the tie bar segments and lever arms which, in turn, causes like rotative movement of a gear train positioned within the adjustment assemblies resulting in opposite sliding movement of the pairs of tapered wedges. The movement of the tapered wedges against the tapered wing shaped portions of the roll chock causes selective inward or outward movement of the roll chock and axial movement of the bottom work roll.

Plug mill bottom roll adjustment

A vertical piercer/elongator mill includes a mill housing having a base, an open top and an open interior defined by a plurality of vertically extending mill posts and interconnecting side portions. A cylindrically shaped bottom cradle supports a rotatable bottom roll and is fitted in the mill housing through the open top thereof to assume an operable position within the open interior of the housing. A cylindrically shaped top cradle supports a rotatable top roll and is also received within the open interior of the mill housing through the open top of the housing. Vertical adjustment apparatus in the form of screw jacks and balance cylinders are associated with the upper and lower cradles to provide vertical movement of the cradles within the mill housing to establish a selected rolling gorge. Hydraulically actuated feed angle adjustment devices are associated with the top and bottom cradles and mill housing to provide controlled rotative movement of the top and bottom cradles about a vertical axis to establish a selected feed angle between the top and bottom rolls. Hydraulic clamps are also associated with the mill housing to fixedly secure the top and bottom roll cradles within the open interior of the mill housing. Motorized guide shoes are provided on the mill housing on opposite sides of the pass line and permit quick guide shoe changes. The mill housing further includes an adjustable bar steadier to provide support for a piercer bar during startup and for subsequent shell support. A spindle support apparatus is also provided for ease in roll spindle coupling.

Vertical piercer mill

A seamless tube mill comprises two disk rolls mounted to be driven in rotation on substantially parallel axes which axes are perpendicular to guide the workpiece along the pass line which rolls may be rotated away from the pass line to enable removal and replacement thereof without disconnecting and realigning the input shafts thereto.

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Pittsburgh, PA, United States of America

William Rozmus