US20120018111A1 - Temperature maintenance and/or possible heating apparatus for long metal products and relative method - Google Patents

Temperature maintenance and/or possible heating apparatus for long metal products and relative method Download PDF

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US20120018111A1
US20120018111A1 US12/858,842 US85884210A US2012018111A1 US 20120018111 A1 US20120018111 A1 US 20120018111A1 US 85884210 A US85884210 A US 85884210A US 2012018111 A1 US2012018111 A1 US 2012018111A1
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line
mobile
casting
bloom
segments
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English (en)
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Gianpietro Benedetti
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Danieli and C Officine Meccaniche SpA
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Danieli and C Officine Meccaniche SpA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/201—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace walking beam furnace
    • F27B9/202—Conveyor mechanisms therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/22—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on rails, e.g. under the action of scrapers or pushers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/38—Arrangements of devices for charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/04—Ram or pusher apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
    • B21B1/085—Rail sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling

Definitions

  • the present invention concerns a temperature maintenance and/or possible heating apparatus for continuously cast long products and the relative method, for a casting and continuous rolling plant in semi-endless mode, to make long metal rolled products such as bars, wire rod, beams, rails or sections in general.
  • the need to transfer the segments of billets or blooms from the various casting lines to the point where they are introduced into the furnace imposes limitations on the length and therefore the weight: the length of the billets or blooms is comprised between 12 and 14 meters, up to a maximum of 16 meters, and the weight is on average equal to 2-3 tons.
  • the number of casting lines has been reduced to two only, providing a suitable temperature maintenance and/or possible heating apparatus which receives the blooms from the two lines and renders them available to the rolling line located downstream.
  • One purpose of the present invention is therefore to devise a temperature maintenance and/or possible heating apparatus for continuously cast long metal products and a relative method associated with two casting lines which allows to manage in a simple and reliable manner the segments of cast product, sheared to size.
  • Another purpose of the present invention is to exploit to the utmost the enthalpy possessed by the original liquid steel along all the production line, and in particular inside the maintenance and possible heating apparatus, reducing temperature losses in the time between shearing the cast product to size and sending it to the rolling step, so as to obtain a considerable saving of energy and a reduction in the running costs compared to conventional processes.
  • the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
  • a temperature maintenance and/or possible heating apparatus for long metal products according to the present invention is provided in a casting and continuous rolling plant of the semi-endless type for the production of long rolled products and is disposed between a continuous casting machine with two casting lines and a rolling line downstream.
  • the continuously cast metal products are sheared to size by shearing means disposed immediately downstream of the casting machine so as to define segments of bloom with a predefined length advantageously comprised between 16 and 60 m, preferably between 30 and 40 m.
  • the rolling line is disposed offset and parallel with respect to the casting lines.
  • Each casting line has a respective crystallizer which can cast products, in relation to thickness, at a variable speed from 3 to 9 m/min.
  • bloom we mean a product with a rectangular or square section in which the ratio between the long side and the short side is comprised between 1 and 4, that is, between the square section and the rectangular section in which the long side can be up to 4 times longer than the short side.
  • the section of the cast product is not limited, as we said, to a quadrangular or rectangular section with straight and two by two parallel sides, but also comprises sections with at least a curved, concave or convex side, advantageously but not necessarily two by two opposite and specular, or combinations of the aforesaid geometries.
  • the square sections which are produced by each continuous casting line have dimensions which vary from about 100 mm ⁇ 100 mm, 130 mm ⁇ 130 mm, 150 mm ⁇ 150 mm, 160 mm ⁇ 160 mm or intermediate dimensions; in order to increase productivity, rectangular sections having dimensions which vary from 100 mm ⁇ 140 mm, 130 mm ⁇ 180 mm, 130 mm ⁇ 210 mm, 140 mm ⁇ 190 mm, 160 mm ⁇ 210 mm, 160 mm ⁇ 280 mm, 180 mm ⁇ 300 mm, 200 mm ⁇ 320 mm or intermediate dimensions can also be produced. In the case of the production of average profiles, even bigger dimensional sections can be used, for example of about 300 mm ⁇ 400 mm and similar.
  • the maintenance and/or possible heating apparatus is located downstream from the casting machine; said segments of bloom, sheared to size, enter directly and without intermediate movements and/or transfers into said apparatus at an average temperature of at least 1000° C., preferably comprised between about 1100° C. and about 1150° C.
  • the average temperature at which the bloom exits from the apparatus is comprised between about 1050° C. and 1200° C.
  • the temperature maintenance and/or possible heating apparatus comprises a mobile movement section and a furnace with lateral transfer, wherein the mobile movement section is disposed between the shearing to size means and the lateral furnace, and provides to move the bloom segments which are cast by the two casting lines.
  • the movement section comprises:
  • a first mobile line which, in a first position, is disposed aligned with the first casting line so as to receive from it the bloom segments and which, in a second position, is disposed aligned with a conveying axis which in turn is aligned with an entrance rollerway into the lateral furnace;
  • a second mobile line which, in a first position, is disposed aligned with the second casting line so as to receive from it the sheared bloom segments and which, in a second position, is disposed aligned with said conveying axis in order to unload the bloom segments inside the lateral furnace.
  • the respective first and second position of the mobile movement lines are independent of each other, thus allowing to render independent of each other the casting processes of the two lines, and preventing any interruptions thereof.
  • the furnace with lateral transfer is disposed downstream of the mobile movement section of the blooms, and comprises said entrance rollerway, an exit or removal rollerway which is parallel and offset with respect to the entrance rollerway and aligned with the rolling line downstream, and transfer devices that provide to transfer the bloom segments from the entrance rollerway to the exit rollerway.
  • a fixed movement section having a first fixed movement line and a second fixed movement line, each of which provides to transport respectively the bloom segments from the first casting line toward the first mobile movement line and respectively from the second casting line toward the second mobile movement line.
  • the fixed movement section advantageously allows to receive the bloom segments arriving from the casting lines during the step when the mobile lines of the mobile movement section are still unloading the bloom segments inside the furnace. This allows to give greater continuity and uniformity in the transfer of the bloom segments for example with very high casting speeds.
  • the furnace with lateral transfer comprises a buffer, or support plane or store zone, to temporarily contain the bloom segments that are temporarily disposed inside it.
  • the buffer is disposed between the entrance rollerway and the exit rollerway from the furnace.
  • the transverse transfer devices comprise displacement means, which transfer the bloom segments from the entrance rollerway toward the buffer that contains the blooms, and extraction means that extract the bloom segments from the buffer in order to render them available to the exit rollerway and thus render them available to the rolling line.
  • the furnace of the apparatus of the present invention is of a length that can vary at least from about 16 to about 60 meters, preferably between 30 and 40 m.
  • the buffer acts as an accumulation store for the blooms, for example when it is necessary to overcome an interruption in the rolling process, due to accidents or for a programmed roll-change or for change of production, in this way avoiding any losses of material and energy and, above all, avoiding any interruption of the casting.
  • the apparatus allows to accumulate blooms for a time that can even reach up to 60/80 minutes (at maximum casting speed) and more, and is in any case variable during the design of the plant.
  • the bloom already gripped in one or more stands can be returned inside the furnace and kept there, also at temperature, preventing any segmentation and therefore any loss of material.
  • the optimum length of the bloom segments, and hence of the furnace that has to contain them is chosen as a function of the reduction to a minimum of the linear combination of the heat losses in the furnace and the losses of material due to crops, short bars and cobbles.
  • the present invention also concerns a method in which the continuous casting step is made in two casting lines; the cast products are sheared to size and conveyed to a furnace following respectively the following steps.
  • the bloom segments are introduced into a mobile movement section having two mobile movement lines, each of which is suitable to receive the bloom segments from the corresponding casting line.
  • the bloom segments are translated transversely to be disposed on an exit rollerway from the furnace which allows to feed a feed mill disposed downstream from the apparatus.
  • the furnace is provided with a buffer, between the entrance and exit rollerway, in which the bloom segments are kept for a time correlated to their size.
  • FIG. 1 shows a possible lay-out of a rolling plant into which a temperature maintenance and/or possible heating apparatus according to the present invention is inserted;
  • FIG. 2 shows a plane view of the maintenance apparatus according to the present invention
  • FIG. 3 shows a section view of FIG. 2 from III to III;
  • FIG. 4 shows a section view of FIG. 2 from IV to IV;
  • FIGS. 5 and 6 show working configurations different from FIG. 4 ;
  • FIG. 7 shows a section view of FIG. 2 from VII to VII;
  • FIGS. 8-11 show examples of some different sections that can be cast with the plant in FIG. 1 ;
  • FIG. 1 shows a first example of a lay-out 14 of a plant for the production of long products according to the present invention, in which a temperature maintenance and/or possible heating apparatus 10 according to the present invention is installed.
  • the lay-out 14 in FIG. 1 comprises, in the essential elements shown, a continuous casting machine 11 comprising two casting lines, respectively a first casting line 12 and a second casting line 13 , which develop parallel to each other, each of which uses a crystallizer or other device suitable to cast blooms with a square or rectangular section and of various shapes and sizes, with straight, curved, concave or convex sides, or other.
  • sections that can be cast with the present invention are shown in FIGS. 8-11 , which show respectively a rectangular section with straight and parallel sides ( FIG. 8 ), a section with short sides with a convex curvature and straight and parallel long sides ( FIG. 9 ), a section with short sides having a convex curvature at the center and with straight and parallel long sides ( FIG. 10 ) and a section with short sides with a concave curvature and straight and parallel long sides ( FIG. 11 ).
  • the lay-out 10 of this casting and rolling plant allows to obtain blooms with a high metric weight given the same section height, or thickness.
  • the first 12 and the second 13 casting lines are disposed on lines offset but parallel to each other and with respect to a single rolling line 30 disposed downstream, they cast two blooms in parallel, preferably with the same section, square or rectangular, and both feed a rolling mill 31 located downstream.
  • the blooms Downstream of the first 12 and the second 13 casting line there are means for shearing to size 15 , for example a shears or an oxy cutting torch, which shear the cast blooms into segments of a desired length, hereafter referred to as bloom segments.
  • the blooms are cut into segments of a length from 1 to 5 times more than that in the state of the art and, according to the present invention, the length is comprised between 16 and 80 meters or more, preferably between 30 and 60 meters. In this way blooms of a great weight are obtained, from 5 to 15 times higher than in the state of the art which, according to the present invention, is comprised between 10 and 50 ton.
  • the different lay-outs are configured as operating in semi-endless mode, in that they start from segments sheared to size, the blooms of great length and great linear weight allow, during normal working conditions, to operate in a condition of substantial continuity, obtaining a performance very close to that of the endless mode.
  • the apparatus 10 ( FIGS. 1 and 2 ) is installed downstream of the continuous casting machine 11 and immediately after the shearing to size means 15 , and comprises a possible fixed movement section 18 , a mobile movement section 19 and a lateral maintenance and/or possible heating furnace 24 .
  • the fixed movement section 18 comprises a first fixed movement line 16 (hereafter referred to as first fixed line) to receive the bloom segments cast by the first casting line 12 , and a second fixed movement line 17 (hereafter referred to as second fixed line) to receive the bloom segments cast by the second casting line 13 .
  • first fixed line to receive the bloom segments cast by the first casting line 12
  • second fixed movement line 17 to receive the bloom segments cast by the second casting line 13 .
  • the first fixed line 16 and the second fixed line 17 are aligned respectively with the first 12 and second casting line 13 and each comprises a rollerway that comprises drawing rollers 36 , suitably motorized, which feed the bloom segments which are mounted inside a transit tunnel 35 closed on the perimeter and suitably insulated to reduce the temperature losses of the bloom segments.
  • the bloom segments entering the fixed movement section have a temperature comprised between about 1100° C. and 1150° C.
  • the main function of the fixed movement section 18 is to temporarily contain the bloom segments sheared by the shearing means 15 when the mobile movement section, in determinate operating conditions, is not yet completely aligned with the fixed one 18 .
  • the mobile movement section 19 ( FIG. 1 ) in turn comprises a first mobile movement line 20 (hereafter referred to as first mobile line) to receive the bloom segments from the first fixed line 16 , and a second mobile movement line 21 (hereafter referred to as second mobile line) to receive the bloom segments from the second fixed line 17 .
  • first mobile movement line 20 hereafter referred to as first mobile line
  • second mobile movement line 21 hereafter referred to as second mobile line
  • both the first 20 and the second mobile line 21 each comprise a plurality of movement sliders 37 , motorized and sliding along rails 39 disposed transversely to the direction of feed of the bloom segments.
  • the movement sliders 37 in their essential components, comprise drawing rollers 40 each of which is made to rotate by drive members 41 , and a conveyor tunnel 43 suitably closed and insulated to limit the temperature losses of the bloom segments.
  • the temperature losses must in any case be contained, so that the bloom segments in the mobile movement section 19 are kept at an average temperature comprised between 1090° C. and 1140° C.
  • Both the first and the second mobile line 21 are suitable to convey into the lateral furnace 24 the bloom segments loaded into them.
  • the two mobile lines 20 , 21 are perfectly aligned respectively with the first 16 and with the second fixed line 17 , whereas, when the bloom segments are conveyed into the furnace 24 , they move transversely and independently of each other, until the bloom segments loaded on them are aligned with a conveying axis 23 which in turn is aligned with an entrance rollerway 25 for the bloom segments into the furnace 24 .
  • the conveying axis 23 is in an intermediate position with respect to the first 20 and the second mobile line 21 so that the latter can align with it at the suitable moment for loading the furnace 24 .
  • FIG. 5 shows a condition in which the first mobile line 20 is in the position for receiving the bloom segments from the first casting line 12 whereas the movement sliders 37 of the second mobile line 21 are displaced transversely in the condition for unloading the bloom segments.
  • FIG. 6 shows a condition in which the movement sliders 37 of the first mobile line 20 are displaced transversely in the position for unloading the bloom segments whereas the second mobile line 21 is in the condition for receiving the bloom segments from the second casting line 13 .
  • the independent movement of the movement sliders 37 advantageously renders the two casting lines 12 , 13 independent of each other, and hence also the methods for conveying the bloom segments inside the furnace 24 .
  • the main function of the fixed movement section 18 is therefore to allow the advance of a bloom segment arriving from a casting line 12 or 13 even when one of the mobile lines 20 or 21 is in an unloading condition and hence in a position that is not suitable for receiving the bloom segments arriving from casting.
  • the entrance rollerway 25 conveys the bloom segments inside the furnace 24 ( FIG. 7 ), and transverse displacement devices 46 provide to displace the bloom segments from the entrance rollerway 25 to a buffer 26 or temporary containing store, in order to render them available, at the appropriate moment, to the rolling line 30 disposed downstream of the furnace 24 .
  • the buffer has a containing capacity indicatively of about eighteen bloom segments, which varies according to the cross section sizes, and has six positions for heating the segments.
  • the furnace 24 is able to process a quantity of products of about 145 tons/hour.
  • the positioning of the bloom segments inside the buffer 26 depends on the particular operating condition of the plant. If the buffer 26 is free, the blooms are positioned in the terminal zone thereof, adjacent to the respective exit rollerway 27 , while if there are other blooms already present on the buffer 26 , or if the rolling mill has a productivity lower than that of the casting, or if the rolling line 22 is stopped for some reason, then the new blooms arriving are put in a queue after those already accumulated and subsequently all of the buffered blooms are trusted together by said transverse displacement devices toward the out position.
  • the movement of the blooms placed on the buffer could be realized, instead of the above mentioned transverse displacement devices, with a plurality of longitudinal walking beams, which are provided of movement mechanisms.
  • Extraction devices 47 provide to selectively extract the bloom segments from the buffer 26 in order to load them onto an exit rollerway 27 from the furnace 24 which is aligned with the rolling line 30 downstream.
  • the entrance rollerway 25 and the exit rollerway 27 are each provided with a plurality of motorized drawing rollers 49 , respectively 50 , disposed equidistant with respect to each other along the whole extension of the furnace 24 and driven by drive members disposed outside the furnace 24 .
  • the temperature of the bloom segments leaving the furnace 24 is comprised between 1100° C. and 1150° C., advantageously 1130° C.
  • the rolling line 30 is provided with other shearing means 33 , of a known type, disposed upstream of the rolling mill 31 .
  • the furnace 24 not only creates the lateral connection between the two casting lines 12 and 13 and the rolling line 22 , but also has the following functions and works with the following modes:
  • the chamber guarantees that the temperature is maintained between entrance and exit
  • the transfer displacement devices 46 continue to accumulate inside the buffer 26 the bloom segments arriving from the two casting lines 12 and 13 , whereas the extraction devices 47 remain still.
  • the buffer 26 allows to carry out production changes, offering the possibility of a buffer time that varies up to 60/80 minutes, without needing to stop or slow down the continuous casting machine 11 .
  • the optimum length of the bloom segments cast by each casting line 12 and 13 is chosen according to the reduction to the minimum of the linear combination of the heat losses inside it and the losses of material due to crops, short bars and cobbles that occur along the rolling line 30 .
  • the furnace 24 Since the optimum length of the bloom segment is calculated as a function of the consumption parameters of the furnace 24 which are directly connected to its length, it is also valid to determine the optimum length of the furnace 24 itself. In fact, the furnace 24 will have an optimum length at least equal to that of the bloom segments, except that advantageously a safety margin is provided which takes into account possible bloom segments sheared out of tolerance, and also the necessary dimensional and constructional adaptations.
  • Another parameter of particular relevance is the sharp reduction in the consumption of natural gas or other fuel to feed the furnace 24 , which is up to 50% lower compared with traditional solutions.
  • the lay-out 14 ( FIG. 1 ) can in any case provide for other devices such as for example units to reduce the section of the rolled product immediately upstream or downstream of the maintenance apparatus 10 , or heating inductors to take the temperature of the blooms to values suitable for the subsequent rolling.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)
  • Cookers (AREA)
US12/858,842 2010-07-21 2010-08-18 Temperature maintenance and/or possible heating apparatus for long metal products and relative method Abandoned US20120018111A1 (en)

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Application Number Priority Date Filing Date Title
ITUD2010A000150A IT1402240B1 (it) 2010-07-21 2010-07-21 Apparecchiatura di mantenimento in temperatura e/o eventuale riscaldo di prodotti metallici lunghi e relativo procedimento
ITUD2010A000150 2010-07-21

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CN113134560A (zh) * 2021-04-29 2021-07-20 杭州汽轮铸锻有限公司 汽轮机转子锻件的锻造装置和方法

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MX2010009066A (es) 2012-01-20
RU2010135761A (ru) 2012-02-27
IT1402240B1 (it) 2013-08-28
CN102343359A (zh) 2012-02-08
ITUD20100150A1 (it) 2012-01-22
EP2410272A1 (en) 2012-01-25
BRPI1002945A2 (pt) 2012-09-04
KR20120011755A (ko) 2012-02-08

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