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

Paolo Bobig

Gianpietro Benedetti

Matteo Remy Bulfone

Estore Donini

Cesare Galletti

Andrea Carboni

Bruno Di Giusto

Stefano Martinis

A method for revamping a starting rolling plant, for producing a final strip starting from a slab having a determinate starting thickness, including: at least one heating furnace configured to heat at least the slab to a determinate starting temperature; at least one reversible roughing stand configured to subject the slab to one or more rolling passes in order to obtain an intermediate rolled product; and a rolling train disposed operatively in line with the roughing stand, including at least one pre-finishing stand and a plurality of finishing stands and configured to reduce the thickness of the intermediate rolled product, until the final strip having a determinate final thickness is obtained.

Method for revamping a plant for producing flat rolled products

The invention concerns a method and a plant for obtaining strips (S), wherein the plant has at least three casting lines () disposed in parallel, of which two are lateral () and one is central (), and at least two rolling lines () aligned with two of said at least three lateral casting lines ().

Method and plant for producing flat rolled products

A plant and a method for producing a final strip starting from a slab having a determinate starting thickness, including: at least one heating furnace configured to heat at least the slab to a determinate starting temperature; at least one reversible roughing stand configured to subject the slab to one or more rolling passes in order to obtain an intermediate rolled product; and a continuous rolling train disposed operatively in line with the roughing stand and configured to reduce the thickness of the intermediate rolled product, until the final strip having a determinate final thickness is obtained.

Plant and method for producing flat rolled products

The invention concerns a method and a plant for producing flat rolled products, in order to obtain strips having a multiple crown transverse profile that subsequently have to be divided in a longitudinal direction into strips of a smaller width; the method provides a rolling step carried out in a rolling mill comprising roughing stands and finishing stands equipped with respective work rolls, in order to supply a strip of a determinate width.

Method for the production of flat metal products, in particular coils of strip, in endless and/or semi-endless mode, in which a metal product is continuously fed to a rolling mill consisting overall of at least 4 stands. The rolling stands are, in sequence, roughing stands, and finishing stands. It is provided to perform a flying gauge change of the metal product exiting from the rolling mill.

Method and apparatus for producing flat metal products

An apparatus for the hot production of strip (N) including a casting machine () configured to cast a thin slab (TS), a heating device () configured to maintain the temperature of and/or heat said thin slab (TS), at least one roughing unit () and a finishing unit () configured to obtain a strip (N), and wherein said casting machine (), the heating device (), the roughing unit (), and the finishing unit () are disposed aligned along a common working axis (Z).

Apparatus and method for the production of strip

Rolling method for the production of flat products with low productivity, which includes a continuous casting step at a speed between 3.5 m/min and 6 m/min of a thin slab with a thickness between 25 and 50 mm. It also includes a roughing step to reduce the thickness in at least one roughing stand to a value between 6 mm and 40 mm, and suitable for winding, a rapid heating step by means of induction in order to at least restore the temperature lost in the segment downstream of casting and in the roughing step, a winding/unwinding step in a winding/unwinding device with two mandrels. The method also includes a rolling step in a rolling unit that consists of a single reversing stand of the Steckel type to roll the product unwound by the winding/unwinding device.

Rolling method for strip and corresponding rolling line

Rolling method for the production of flat products with low productivity, comprising a continuous casting step at a speed comprised between 3.5 m/min and 6 m/min of a thin slab with a thickness comprised between 25 mm and 50 mm, a roughing step to reduce the thickness in at least one forming stand or roughing stand, to a value comprised between 10 mm and 40 mm, preferably between 10 mm and 30 mm, even more preferably between 10 mm and 20 mm and suitable for winding, a rapid heating step using induction in order to at least restore the temperature lost in the segment downstream of casting and in the roughing step, a winding/unwinding step in a winding/unwinding device with two mandrels, a rolling step in a Steckel type rolling unit with two reversing type stands of the product unwound by the winding/unwinding device comprising not more than three double rolling passes, or two inversions, in order to obtain a final product comprised between 1-1.2 mm and 16 mm, a cooling step and a winding step of the final product.

A rolling line for the production of flat product includes a casting machine to continuously case a thin slab, a temperature maintenance and homogenization unit, a rolling unit a forming stand or roughing stand connected to the exit of the casting machine to reduce the thickness of the slab. The forming stand or roughing stand is configured to perform an adaptive reduction of the thickness of the cast slab smaller than or equal to about 65% at least as a function of the thickness, width and type of material of the finished flat product. The rolling unit is configured to perform a reduction of the reduction of the thin slab coming from the temperature maintenance and homogenization unit to a thickness comprised between about 1.2 mm and about 20 mm by three or fewer double rolling passes through the double rolling stand.

Rolling line and relative method

Rolling method for the production of flat products, such as metal strip, which provides a production step of a thin slab with a thickness comprised between 30 and 90 mm, preferably between 35 and 70 mm, a temperature maintenance and/or possible heating step of the slab to be sent for rolling, and a rolling step with multiple passes performed in a reversing rolling mill () comprising at least a reversing rolling stand (), in which at least a winding reel furnace () is also present upstream of the stand () and a winding reel furnace () downstream of the stand (), a winding step also being provided downstream of the rolling in at least a coiler () to form a relative coil of strip of a defined weight, comprised between 20 and 30 tons, and a cooling step of the strip being provided between the reversing rolling mill () and said at least one coiler (). The method provides that the thin slab is disposed, for example, sheared to size, upstream of the maintenance and/or possible heating step in order to form a segment of slab having a length equivalent, in weight, greater than that of a coil, and that, already after the first rolling pass in the reversing rolling mill (), the thickness of the segment of slab is reduced to a value in the range of 20-25 mm so as to render it windable on the reel furnace () downstream of the stand ().

Rolling method for flat products and relative rolling line

A continuous casting device including at least a crystallizer suitable for casting a metal product, and a plurality of guide and containing segments with rolls, the function of which is to accompany the cast product exiting from the crystallizer. The device includes, an extension of or in an intermediate position to one or more of the guide and containing segments with rolls, one or more guide and containing segments of the mixed type with panels and rolls, each including one or more guide rolls disposed on at least one side of the product and insulated and/or reflecting and/or heated panels disposed on the opposite side of the product, so as to reduce the loss of temperature of the cast product in transit.

Continuous casting device and relative method

A rolling method in a rolling line, to obtain strip with a thickness varying from 0.7 mm to 20 mm, for steel which can be cast in the form of thin slabs with a thickness from 30 mm to 140 mm, the line includes a continuous casting device; a tunnel furnace for maintenance/equalization and possible heating; a rolling train having a roughing train and a finishing train; a rapid heating unit, with elements able to be selectively activated, interposed between the roughing train and the finishing train. For each lay-out of the rolling line, the position of the rapid heating unit which defines the number of stands which form the roughing train, disposed upstream of the unit, and the number of stands which form the finishing train, disposed downstream of the unit, is calculated as a function of the product of the thickness and speed of the thin slab.

Method and plant for the production of flat rolled products

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

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 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,.

Growing community of inventors

San Canzian d'Isonzo, Italy

Paolo Bobig