Danieli & C. Officine Meccaniche S.p.a.

Estore Donini

Fausto Drigani

Cesare Galletti

Gianpietro Benedetti

Paolo Bobig

Giacinto Dal Pan

Roberto Millone

Carlo Di Paolo

Andrea Carboni

Method and device to control the axial position of slabs emerging from continuous casting applied in rolling plants comprising at least a casting machine ( ), a heating and/or temperature maintenance furnace ( ) and a roughing and prefinishing ( ) or finishing train ( ) comprising at least one rolling stand ( ), the method serving to align the axis ( ) of a slab ( ) entering the furnace ( ) with the axis ( ) of the first rolling stand ( ), the method providing to control the axial position of the slab ( ) and to activate at least a thruster element ( ) able to be introduced inside the furnace ( ) to act on the edge of the slab ( ) and displace it laterally according to a measured discrepancy between the axis ( ) of the slab ( ) and the axis ( ) of the rolling stand ( ), wherein the thruster element ( ) has a contact element ( ) able to cooperate with the edge of the slab ( ) advancing inside the furnace ( ).

Method to control the axial position of slabs emerging from continuous casting and relative device

Rolling stand ( ) for plane products and method to control the planarity of said plane products, said rolling stand comprising a pair of working rolls ( ), a corresponding pair of back-up rolls ( ) and at least an intermediate roll ( ) located between one of said working rolls ( ) and a corresponding back-up roll ( ), axial translation means ( ) and bending means ( ) being associated with at least one of said working rolls ( ) to translate it axially and respectively bend it, crossing means ( ) being associated with said intermediate roll ( ) to arrange it with its longitudinal axis ( ) inclined, that is, rotated, with respect to the longitudinal axes ( ) of said working rolls ( ) and of said back-up rolls ( ).

Rolling stand for plane products and method to control the planarity of said products

A method to eliminate the play between the chock ( ) and the support element ( ) in four-high rolling stands ( ), the rolling stand ( ) comprising working rolls ( ) and back-up rolls ( ) assembled on respective chocks ( ), support blocks ( ) to support the chocks ( ) and a stationary housing ( ), the support blocks ( ) to support the chocks ( ) and a stationary housing ( ), the support blocks ( ) being arranged between the uprights of the stationary housing ( ) and the relative chocks ( ) and supporting means for the crossover lateral displacement of the rolls ( ), the stand ( ) also comprising transmission means to transmit a thrust ( ) acting on the upper chock ( ) and contrasting the rolling thrust ( ), the method providing to define the value of the inward flection of the uprights of the housing ( ) according to the value of the rolling thrust ( ), to define the entity of play ( ) resulting, with the uprights ( ) in this condition of flection, between the chock ( ) and relative support block ( ) during the crossover movements of the chocks ( ), and to displace at least one support block ( ) towards the relative chock ( ) so as to minimize the play ( ) to a desired value at least during the rolling passes. A device to achieve the above method.

Method to eliminate the play between chocks and relative support blocks in four-high rolling stands and relative device

Method to control the planarity of flat products rolled with a rolling stand ( ) having a pair of working rolls ( ), a corresponding pair of back-up rolls ( ) and at least an intermediate roll ( ) placed between one of said working rolls ( ) and a corresponding back-up roll ( ), axial translation means ( ) and first bending means ( ) associated with at least one of said working rolls ( ) to translate it axially (WR shifting) and respectively bend it (WR bending), crossing means ( ) associated with said intermediate roll ( ) to arrange it with its longitudinal axis ( ) inclined (IR crossing), that is, rotated on a horizontal plane, with respect to the longitudinal axes ( ) of said working rolls ( ) and of said back-up rolls ( ), and second bending means ( ) associated with said intermediate roll ( ) to bend it with respect to the horizontal plane (IR bending), said method providing a first static setting step, operating selectively at least on WR shifting and on IR crossing, and at least a second dynamic setting step, that is to say, during rolling, operating selectively at least on WR bending and IR bending.

Method for the static and dynamic control of the planarity of flat rolled products

Method and device to control the axial position of slabs emerging from a continuous casting machine, providing to control the axial position of the slab (,) in correspondence with the inlet to the first rolling stand and to act in feedback on means to modify the correct position of the axis (,) of the slab (,) in a position located between the first rolling stand and the foot rolls (,) of the ingot mold (,) from which the slab (,) emerges, wherein alignment means operating inside the furnace (,) are employed to induce a controlled lateral displacement governed by the control of the axial position of the slab (,).

Method to control the profile of a strip (,) in a rolling stand for strip and/or sheet comprising at least two working rolls, respectively upper (,) and lower (,) and defining a reference pass-line (,) substantially coinciding with the center line of said strip (,), said rolls (,) defining between them a transit gap (,) through which said strip (,) passes and is rolled and being supported at the ends by respective chocks, said method providing the axial movement (shifting) of said working rolls (,) with respect to said pass-line (,), said working rolls (,) having a shaped surface profile (,) which can be expressed by a polynomial equation, said method providing to apply a first value (&ldquo;s,&rdquo;) of axial translation, or shifting, to said upper working roll (,) and a second value (&ldquo;s,&rdquo;) of axial translation, or shifting, to said lower working roll (,), s,being &ne;s,.

Method to control the profile of strip in a rolling stand for strip and/or sheet

Method and device to reduce and eliminate vibrations in a rolling stand for plane rolled products comprising working rolls associated with by motor a kinematic chain, there being included nozzles to deliver a mixture of water and lubricant to the surface of each of the working rolls; the method providing to measure the effective value of torque transmitted to each of the working rolls and to selectively vary the percentage of lubricant contained in the mixture delivered to each of the working rolls according to the effective torque measured.

Method to reduce and eliminate vibrations in a rolling stand and relative device

A bending block for a four-high rolling stand comprising working rolls (,) and back-up rolls (,) associated with respective chocks (,), the stand also comprising a stationary housing (,) associated with means (,) for the crossing of the rolls, the working rolls (,) being able to be translated axially. The crossing means (,) cooperating with the outer lateral faces of the chocks (,) at least of the working rolls (,) by means of intermediate plates to distribute the thrust. There also being included bending jacks to bend at least the working rolls (,), the intermediate plates to distribute the thrust consisting of gibs (,) shaped like a vertical plate (,) with at least two fins (,) orthogonal to the vertical plate (,), the two fins (,) being arranged on one side and the other astride a fin extension (,) of the chock (,) of the relative working roll (,), the two fins (,) defining the respective positioning seating (,) for the bending jacks (,). There also being included between the crossing means (,) and the relative gib (,) a containing and guiding plate (,).

Bending block for four-high rolling stand

Compression unit for oscillating roll, suitable to generate a compression thrust on a surface subject to translatory movements on a plane which does not contain the axis on which the compression thrust is made. The compression unit include an oscillating plunger body housed inside a stationary housing seating made in a piston element, the plunger body being conformed as a double element spherical cap, the first spherical cap element facing towards the piston element, being entirely contained inside the containing seating cradle and cooperating rotatably, with the inner spherical surface of the seating, the second spherical cap element being partly outside the containing cradle and facing towards the translatable surface and partly cooperating with the at least partly spherical surface of a movable element solid with the translatable surface. Between the first and second spherical cap elements there is placed an annular cylindrical connection and centering element including an elastic ring.

Compression unit for oscillating roll

Compact continuous casting line for thin slabs, the continuous casting line comprising at least a curved segment and a subsequent straight segment, the casting line comprising at least an ingot mould (12) connected at the outlet with an extraction and possible soft reduction assembly (13) associated at the end with at least a drawing assembly (14) consisting of pinch rolls (15), the drawing assembly (14) being followed by at least a shearing assembly (16), an extractor device (17) to extract the dummy bar and by a possible temperature-restoration furnace (21, 121), there also being included at least a descaling device (20) using water, the descaling device (20) being arranged upstream of the shearing assembly (16), and the temperature-restoration furnace (21, 121) being arranged in a position near the outlet of the shearing assembly (16).

Compact continuous casting line

Method and relative line for the continuous rolling of plate and/or strip, starting from at least two lines for the continuous casting of thin slabs (11) of between 60 and 120 mm thick, the pre-slabs being continuously cast within a limited range of thicknesses of between 70 and 140 mm and at a speed of up to 6+7 meters per minute, the pre-slabs then being transformed into slabs by a process of soft-reduction (112) which reduces the thickness of the individual pre-slab by 5 to 40 mm so as to obtain a range of slabs with a defined thickness using the the same crystallizer, and the rolled product (111) now in a strip leaving the roughing train (17) being sent to the finishing train (20), the leading end of the strip as it arrives being connected to the trailing end of the strip being rolled so as to form a substantially continuous product fed to the finishing train (20), the connection being made by a welding machine (24) positioned upstream of the finishing train (20), the end-of-rolling temperature being between 840 and 880.degree. C. and the product of the speed of the strip at the outlet of the finishing train, multiplied by the thickness of the strip being between 800 and 1100 mm.m/min.

Method for the continuous rolling of plate and/or strip and the relative

Method and device for the lateral compacting of slabs, which is employed in a rolling line at least upstream of the finishing rolling mill stands as an alternative to, or in cooperation with, rolling mill stands with vertical rolls, employing two counter-opposed compacting dies (11) supported by relative die-holder bodies (13) and associated with relative lateral edges of the slab (12) being rolled, each compacting die (11) cooperating with the relative actuation system comprising a crankshaft (15) and one element having the function of a connecting rod (18) positioned with its axis (30) on the same plane as, and perpendicular to, the axis of feed of the slab (12) and having one of its ends rotatably associated with the crankshaft (15) and its other end rotatably associated with the relative die-holder body (13), including two connecting rod elements associated with each crankshaft and with each die-holder body, at least one of the two connecting rod elements varying its length during each working cycle, said variation occurring at least during the return travel of the die-holder body.

Method for the lateral compacting of slabs and relative device

Device to move the rolls in a four-high rolling stand to roll sheet and wide plate, the device comprising jaws (12, 13) cooperating with the chock (14) of the respective lower (11) and upper (11a) roll, the jaws (12, 13) presenting at least a closed position in which they make the chock (14) solid to the system of axial travelling (23, 24) of the rolls (11, 11a) and an open position in which they release the rolls (11, 11a), the jaws (12, 13) cooperating with respective mating seatings defined laterally to the relative chock (14), each of the jaws (12, 13) being respectively connected to the system of axial travelling (23, 24) by an articulated parallelogram unit able to move on a plane which is substantially at right angles to the rolling plane, the articulated parallelogram unit comprising paired rods, respectively (17,117;18,118), pinned at the front to the respective jaws (12, 13) and associated at the rear with the axial travelling system (23, 24) by an articulation (19) with at least two axes of rotation.

Device to move the rolls in a four-high rolling stand for sheet and wide

Method and device to guide the strip between the stands in a rolling mill finishing train to roll thin strips of a final thickness in the order of 1.2 mm and less, the inter-stand device including at least a guide device arranged at the outlet of the upstream stand (11a), a looper unit (15) comprising at least a looper roller (20) and a guide device arranged at the inlet to the downstream stand (11b), the looper roller (20) having at least a lowered position at the step before the leading end of the strip enters and a plurality of raised positions, while the strip is passing through, to form the desired loop, the looper roller (20), at least when it is in the lowered position before the strip enters, being made to rotate at a tangential speed at least equal to the speed at which the strip is fed between the stands. The looper unit (15) comprises an empowered drive (21) associated with the looper roller (20) at least when the looper roller (20) is in its lowered position, the drive (21) being structured to make the looper roller (20) rotate, before the strip enters, at a tangential speed at least equal to the speed at which the strip is fed between the stands.

Method to guide the strip between the stands in a rolling mill finishing

Block to provide curvature and balancing, which is suitable to impart an 'IN' or 'OUT' pre-curvature to processing rolls (11) of a four-high rolling mill stand (12) comprising a pair of processing rolls, lower (11a) and upper (11b) rolls respectively, each of which cooperates with a relative back-up roll (13a, 13b), the processing rolls (11a, 11b) and back-up rolls (13a, 13b) cooperating at their two ends with respective chocks (15a, 15b) and (16a, 16b) and relative bearings, the block comprising at least one lower rib (18a, 118a) and one upper rib (18b, 118b) including on their respective inner surfaces curvature jack means (20, 120) cooperating with the opposite surfaces of the chocks (15) of the processing rolls (11), supporting jacks (14) being included and cooperating with the chocks (16a, 16b) of the back-up rolls (13a, 13b), at least one rib (18) including on its outer surface compensation jack means (21, 121) which are actuated when an 'OUT' pre-curvature is imparted to at least one processing roll (11) associated with the block (10), the compensation jack means (21, 121) acting on the chocks (16) of the corresponding back-up roll (13).

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Vimercate, Italy

Estore Donini