Rolling mill stand and related rolling mill for longitudinally rolling rod-shaped bodies
AssigneeDanieli & C. Officine Meccaniche SpA
InventorsCernuschi Ettore, Fabrizio Marini, Aristide Giacomo Bertelli
Life of this patent
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Abstract
A rolling mill stand and related rolling mill for rolling rod-shaped bodies, even large in size, which meets the requirement of stiffness uniformity of the rolling mill stands in the transversal direction, all the hydraulic capsules being firmly fixed to the external structure of the rolling mill and providing for the side change of the rolls of each stand. The arrangement of rolling rolls and related extensions of each rolling mill stand is such to avoid problems of corrosion and damaging to the extensions themselves and to the reducers due to the drainage of the cooling waters.
Claims13
A rolling mill stand, defining a rolling axis, comprising
- a fixed external structure,
- three working rolls arranged in a roll-holder cartridge, said cartridge being movable from a working position inside the fixed structure, at said rolling axis, to a side extraction position outside the fixed structure for changing the working rolls,
- wherein there is provided for each working roll at least one respective hydraulic capsule firmly fixed to the fixed structure,
- wherein at least a first hydraulic capsule is of the double-stroke type, thus providing, in addition to a first working stroke for adjusting the radial position of the respective working roll, a second clearance stroke from the rolling axis, to facilitate the side extraction of said roll-holder cartridge,
- wherein a second hydraulic capsule is horizontally arranged to allow said roll-holder cartridge to be extracted along a horizontal plane.
A rolling mill stand according to any one of the claims from 2 to 7, wherein said first hydraulic capsules are of the movable top type and comprise a movable piston acting on the seal-holder yoke of the roll, a hollow piston in which the movable piston slides and a fixed external cylinder.
A rolling mill for rolling rod-shaped bodies, defining a rolling axis, comprising a plurality of rolling mill stands, according to any one of the claims from 1 to 9, said rolling mill stands being arranged in sequence and tilted by a 180° angle with respect to the previous one, to the vertical axis passing through the rolling axis, wherein the roll-holder cartridges are alternatively extracted from the various stands of the rolling mill on the two sides of the rolling mill itself.
A process for extracting a roll-holder cartridge from a working position, inside a rolling mill stand according to claims from 1 to 9, to a side position outside said stand for changing the working rolls, the process comprising the following steps:
- disengaging the working roll-extension joints for the first extension and for the second extension arranged on the side where the second hydraulic capsule is horizontally arranged;
- actuating the extension-holding device for supporting the second extension, arranged on the extraction side of the roll-holder cartridge;
- actuating the slide so as to release the second further extension from the respective working roll and sliding the slide from an all forward position to an all backward position;
- lowering the extension-holding device so as to take said second extension to a position which does not interfere with the horizontal plane for extracting the roll-holder cartridge;
- extracting the roll-holder cartridge from said working position to said external side position along said horizontal plane.
Dependencies are inferred from the claim text.