US3805570A - Method and apparatus for rolling hot metal workpieces and coiler for use in coiling hot metal workpieces - Google Patents

Method and apparatus for rolling hot metal workpieces and coiler for use in coiling hot metal workpieces Download PDF

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US3805570A
US3805570A US00305995A US30599572A US3805570A US 3805570 A US3805570 A US 3805570A US 00305995 A US00305995 A US 00305995A US 30599572 A US30599572 A US 30599572A US 3805570 A US3805570 A US 3805570A
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mill
hot metal
downcoiler
coil
rolling
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W Smith
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Steel Company of Canada Ltd
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Steel Company of Canada Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/02—Winding-up or coiling
    • B21C47/08—Winding-up or coiling without making use of a reel or drum, the first turn being formed by a stationary guide
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/02—Winding-up or coiling
    • B21C47/04—Winding-up or coiling on or in reels or drums, without using a moving guide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0057—Coiling the rolled product

Definitions

  • ABSTRACT The rollng of hot metal workpieces in a rolling mill including a roughing mill, a finishing mill and amandrelless coiler located between the former two components is accomplished by first rolling the workpiece in the roughing mill, then coiling the workpiece in the coiler, uncoiling the workpiece from the coiler, delivering'the workpiece to the finishing mill and rolling it in the finishing mill.
  • This invention in a first aspect relates to methods and apparatus for rolling hot metal workpieces, particularly steel, although the invention may be applied to the hot rolling of another metals, such as aluminum, for example.
  • This invention in a second aspect relates to coilers for use in coiling hot metal workpieces, particularly coilers useful in methods or that constitute part of apparatus embodying the first aspect of this invention.
  • the conventional method of rolling hot metal strip involves heating an ingot or slab to approximately 2,300F (for steel) and reducing it in thickness by rolling it through a series of rolling mill stands. Normally the rolling sequence takes place in two stages referred to as the roughing mill and and finishing mill.
  • the roughing mill stage In the roughing mill stage the slab or ingot normally is rolled through one or more rolling mill stands in a series of passes until it is reduced in'thickness to a transfer bar approximately I inch thick.
  • the roughing mill stage also may include one or more vertical edging mills.
  • the transfer bar normally is transferred on table rolls to a continuous finishing mill train where it is further reduced to the desired gauge.
  • zoom rolling involves accelerating the finishing mill after the head end of strip has reached the coilers to compensate for the temperature differential by increasing the amount of heat put into the transfer bar during the finishing mill operation. Zoom rolling also decreases the time that the transfer bar sits on the transfer table. Where zoom rolling is used, zoom cooling also is required.
  • a Steckel mill is designed primarily for the purpose of rolling light gauge strip on a single stand reversing hot mill. Normally there is provided a reversing roughing stand that reduces a slab to about 1 inch before presenting it to a single stand, reversing, four high roll stand with a hot coiling furnace located on either side thereof. The transfer bar is passed back and forth through the latter stand until the desired thickness is obtained, the strip being successively reheated in the coiling furnaces on the final passes.
  • This method suffers from the following drawbacks:
  • a hot metal workpiece is rolled in a roughing mill and the resultant hot transfer bar then is delivered to and downcoiler in a mandrelless eoiler.
  • the transfer bar subsequently is uncoiled from the downcoiler, delivered to a finishing mill and then rolled in the finishing mill.
  • apparatus for rolling hot metal workpieces that offers the advantages (a), (b) and (c) noted beforehand and that can offer other of the advantages comprises first and second rolling mills and a mandrelless downcoiler located therebetween for receiving and coiling hot metal workpieces from the first rolling mill prior to being delivered to the second rolling mill.
  • a mandrelless downcoiler that offers a number of advantages over coilers having a mandrel and some advantages over upcoilers.
  • FIG. I is a schematic top elevation of a conventional, fully continuous hot strip mill
  • FIG. 2 is a schematic top elevation of a continuous hot strip mill constituting a preferred embodiment of the first aspect of this invention
  • FIG. 3 is a side elevation, partly in section, of a coiler constituting a preferred embodiment of the second as' pect of this invention
  • FIG. 4 is a top elevation of the coiler shown in FIG. 3;
  • FIGS. 5-10 are schematic side elevations of the coiler shown in FIG. 3 at various stages during its operation.
  • the conventional, fully continuous hot strip mill of FIG. 1 includes, in the following order, a furnace 10, a vertical scale breaker 11, a horizontal scale breaker 12, a roughing mill consisting of five roughing mill stands 13, 14, 15, 16 and 17 each with its own vertical edger, a rotary crop shear 18, a finishing mill consisting of six finishing mill stands 19, 20, 21, 22, 23 and 24 and three coilers 25, 26 and 27.
  • a furnace 10 a vertical scale breaker 11, a horizontal scale breaker 12, a roughing mill consisting of five roughing mill stands 13, 14, 15, 16 and 17 each with its own vertical edger, a rotary crop shear 18, a finishing mill consisting of six finishing mill stands 19, 20, 21, 22, 23 and 24 and three coilers 25, 26 and 27.
  • P.I.W pounds per inch of width
  • FIG. 2 illustrates a preferred embodiment of the first aspect of this invention and shows a continuous hot strip mill also arranged to roll 1,000 P.I.W. strip. It differs from the mill of FIG. 1 in that it includes a coiler 29 located between final roughing mill and stand 17 and the first finishing mill stand 19. More specifically, a coiler 29 is located between roughing mill stand 17 and rotary crop shear 18. Not shown but part of the hot strip mill is the runout table on which the strip passes from the finishing mill to the coilers 25, 26 and 27, the water sprays above the runout table, other roller tables between various components and a descaling spray unit that may be located between crop shear I8 and finishing mill stand I9, all of which are conventional. It also should be understood that the number and type of stands that constitute the roughing and finishing mills, the type, location and even provision of a crop shear, and the number and type of coilers 25-27 are not material to this aspect of this invention.
  • Coiler 29 is a mandrelless coiler that accepts the hot metal strip from roughing mill stand 17 head end first, coils the hot metal strip and then delivers it tail end first to the finishing mill.
  • Coiler 29 is a mandrelless downcoiler, since a coiler of this type offers a numberof advantages which will become more apparent hereinafter.
  • a mandrelless downcoiler that is constructed in accordance with the second aspect of this invention and which is used in methods embodying the first aspect of this invention and as part of apparatus embodying the first aspect ofthis invention is illustrated in FIGS. 3 and 4 and will be described in greater detail hereinafter.
  • FIG. 2 The operation of the apparatus shown in FIG. 2 and a preferred method embodying the first aspect of this invention now will be described with reference to FIG. 2.
  • a slab or ingot from furnace I0 is processed in a conventional manner in scale breakers l1 and 12 and the roughing mill. As the slab or ingot is processed through the roughing mill, its length increases and its thickness diminishes, and ultimately a hot transfer bar emerges from final roughing mill stand 17.
  • the transfer bar should be as long as possible.
  • the transfer bar is considerably longer than the distance between roughing mill stand 17 and crop shear 18 and, even more preferably, is considerably longer than the spacing between roughing mill stand 17 and finishing mill stand 19.
  • the transfer bar is delivered on a suitable roller table (not shown) head end first to coiler 29, and the complete transfer bar is coiled therein. This step is as opposed to the step utilized in the operation of the mill of FIG. 1 wherein the transfer bar would be delivered from the roughing mill to a delay table and remain thereon until delivered to the finishing mill, with all the attendant disadvantages that flow from this prior art procedure.
  • Coiler 29 is a special type of coiler, i.e., a mandrelless downcoiler, that offers important advantages and details of one embodiment of which are set out hereinafter.
  • the transfer bar After the transfer bar has been completely coiled in coiler 29, it is uncoiled and delivered on a roller table (not shown), preferably tail end first, to the finishing mill. Before the transfer bar is delivered to the finishing mill, it passes through crop shear 18 that crops the end of the transfer bar in a conventional manner. The transfer bar then is rolled-in the finishing mill in a conventional manner and delivered on a runout table (not shown) to and coiled by one of coilers 25, 26 and 27. As noted beforehand, a descaling unit may be provided between crop shear l8 and finishing mill stand 19 and water sprays for cooling the transfer bar are provided over the runout table.
  • mandrelless downcoiler 29 and the rolling technique hereinbefore described enables the length of the transfer table between the roughing and finishing stands to be reduced appreciably.
  • a mill designed to roll 1,000 P.I.W. it may be possible to reduce the length of the transfer table by about 250 or 260 resulting in a considerable capital cost saving.
  • FIGS. 1 and 2 Another significant advantage of the method constituting the first aspect of this invention can be seen by comparing the lengths of the runout table in FIGS. 1 and 2, this length being the distance between the last finishing mill stand 24 and the first coiler 25.
  • the runout table For a conventional, fully continuous hot strip mill (FIG. 1) the runout table is 530 feet in length.
  • the runout table in FIG. 2 is only 385 feet, a difference of 145 feet. This reduction in the length of the runout table results from the fact that zoom rolling is not required when coiler 29 is employed.
  • the transfer bar In conventional, hot strip mills the transfer bar is accelerated considerably as it passes through the finishing mill stands (so called zoom rolling) to compensate for the head-to-tail temperature rundown of the transfer bar.
  • An extremely important feature in the development of proper metallurgical properties in the strip emerging from the finishing mill is the cooling which takes place between the last finishing mill stand 24 and the coiler and, consequently, the temperature at which the strip is coiled.
  • the transfer bar In conventional, hot strip mills the transfer bar is accelerated during passage through the finishing mill, so the runouout table must be sufficiently long to allow adequate cooling of the strip existing from the finishing mill at very high speed (up to 4,000 feet per minute).
  • the transfer bar can be rolled in the finishing mill at more moderate, constant speeds of, say, about 2,500 feet per minute and achieve similar rolling rates. Consequently, the length of the runout table can be considerably shorter and yet still provide the necessary degree of cooling for the entire length of rolled strip.
  • the first aspect of this invention may be practised with an existing, conventional, continuous hot strip mill of the type shown in FIG. 1. Since such a hot strip mill is an existing mill, no saving in real estate, mill buildings foundation, roller tables etc. will be realized, but, on the other hand, the capacity of the mill can be suitably increased by virtue of its ability to accommodate a transfer bar on the final pass through roughing mill stand 17 that is considerably longer than the transfer bar that can be accommodated without the provision of coiler 29.
  • a mill designed and powered for rolling the bulk of the product mix eg 62 inches wide, 0.09 inch thick X 750 P.I.W., in a conventional manner could, by the practise of the method hereinbefore described, roll a wider range of product, possibly 74 inches wide, 0.06 inch thick X 1,000 P.I.W., the coiler in the latter case providing the temperature equalizing and heat retention required in order to remain within the power capability of the mill and metallurgical property limits of the product.
  • the transfer bar stored in coil form in coiler 29 goes through a temperature equalizing cycle, and it can be arranged so that there is negligible heat loss to the atmosphere, the temperature of the transfer bar entering the first finishing mill stand 19 can be substantially constant head to tail, and the transfer bar then can be fed into the finishing mill train at a slower speed, so that more power can be used for rolling materials like stainless steel or high strength low alloy steels.
  • the head to tail temperature of the transfer bar entering the first finishing stand 19 can be substantially constant, zoom rolling and its attendant complications conventionally required to compensate for head to tail temperature rundown can be avoided, as aforementioned.
  • Ancillary to this there is no necessity to accelerate gradually from, say, 2,000 ft./min. to 4,000 ft./min., as is necessary when zoom rolling is practised. Consequently, after the strip has reached the coilers 25, 26 or 27, the finishing mill stands can be accelerated to top speed at a very fast rate and produce at a higher rolling rate.
  • the strip can travel at a constant speed between the last finishing mill stand 24 and the coilers, simplifying the runout cooling spray system (no zoom cooling), and yet identical metallurgical properties can be obtained throughout the coil.
  • the temperature of the transfer bar entering the first finishing mill stand 19 can be predetermined and will remain substantially constant regardless of thickness or coil size, it should be possible to roll high tensile alloy steel by reducing mill speed and hence increasing mill power and taking minor productivity penalties.
  • the reduction in rolling speed also will eliminate the need for high powered coilers and possibly could permit the use of in-line flying shears in place of coilers and also reduce the fumes normally produced on the last three finishing mill stands of a conventional high speed mill.
  • any cobbles at the finishing mill or coilers usually mean the loss of the following transfer bar being rolled simultaneously at the roughing mill, since it would be too cold for further processing after the cobble has been cleared.
  • the roughing mill could complete its operation and the hot transfer bar could be stored in coiler 29 until the cobble was cleared.
  • the transfer bar may come into the first finishing mill stand at the relatively high temperature of about l,950F 2,000F to compensate for the head to tail temperature drop during finishing mill rolling, and this high temperature results in substantial scale formation.
  • the development of secondary scale through the finishing mill stands can be controlled by predetermining the transfer bar temperature at its time of entry into the finishing mill and keeping it below the temperature at which high temperature secondary scale forms.
  • slabs 30 are on skids which create cold spots in the slabs. Operation of the A.G.C. system is required to reduce the thickness of these cold spots. In a mill of the type shown in FIG. 2, it may be possible to substantially temperature equalize the cold spots.
  • coiler 29 is a mandrelless downcoiler. since a coiler of this type avoids many of the problems that are inherent in hot strip coilers having a mandrel and that have been used with Steckel mills, for example. Mandrelless coilers having been used in the past for coiling cold strip, but their use for coiling a hot transfer is believed to be unique. A mandrelless downcoiler is used rather than a mandrelless upcoiler, because the latter does not lend itself to a subsequent uncoiling operation in a continuous manner without the aid of peelers and pinch rolls. This is an important consideration when one is dealing with a hot transfer bar being processed in a hot strip mill, since subjecting the hot transfer bar to scratches or conditions under which cold spots could occur must be avoided.
  • a mandrelless downcoiler that coils a hot transfer bar into the form of a complete coil and then, in one continuous operation, uncoils the transfer bar in the same direction.
  • the mandrelless downcoiler is designed to avoid scratching of the surface of the hot transfer bar by minimizing the use of mechanical equipment that could result in this undesirable effect.
  • it is designed to be operated in such a manner as to prevent cold spots from being formed in the hot transfer bar as a result of the hot transfer bar becoming stationary while in contact with a cold metal surface.
  • a mandrelless downcoiler 40 includes an entry pinch roll set 41, a set 42 of bending rolls, a set 43 of coil cradle rolls, three drive mechanisms 44, 45 and 46 respectively of any suitable type for the foregoing sets of rolls, an inner wrap retainer 47, a suitable drive mechanism 48 for reciprocating the retainer into and out of position, exit sideguides 49, a standby exit pinch roll 50, a removable cover 51, an emergency peeler 52 and any suitable drive mechanism 53 for peeler 52.
  • Entry pinch roll set 41 consists of upper and lower driven rolls 54 and 55 respectively mounted with their axes of rotation parallel to each other.
  • deflection plates 56 Extending between pinch roll set 41 and bending roll set 42 are deflection plates 56 for guiding the hot transfer bar to the bending roll set.
  • the latter is conventional in nature and consists of one lower and two upper driven rolls 57, 58 and 59 respectively mounted with their axes of rotation parallel to each other and to the axes of rotation of rolls 54 and 55.
  • the bearing blocks 60 and 61 are provided at each end of rolls 58 and 59 respectively and may be reciprocated up and down along tracks 62 and 63 respectively by means of hydraulically operated pistons (not shown) contained in cylinders 64 and 65 respectively and connected to bearing blocks 60 and 61 via connecting rods 66 and 67 respectively.
  • Cylinders 64 and 65 are mounted on a part 68a of the framework or housing of coilers 40.
  • screw jacks or other devices may be used for moving rolls 58 and 59.
  • rolls 57, 58 and 59 When rolls 57, 58 and 59 are in the position shown in FIG. 3, the hot transfer bar is forced to follow a curved path in passing between the rolls, and the transfer bar receives a permanent bend or curvature. However, rolls 58 and 59 can be retracted when it is desired not to bend the transfer bar.
  • Cradle roll set 43 consists of three driven cradle rolls 68, 69 and 70 mounted with their axes of rotation parallel to each other and to the axes of rotation of rolls 54, 55, 57, 58 and 59.
  • cradle roll 70 could be replaced by a skid plate.
  • Inner wrap retainer 47 normally remains in a retracted position and is not to be confused with a mandrel.
  • a mandrel is a device upon which a material may be coiled.
  • Inner wrap retainer 47 is in its retracted position during the whole of the coiling operation. It is inserted into the hollow core of the coil only towards the end of the uncoiling operation and serves to retain the inner wraps of the coil in position during the last stages of uncoiling.
  • Exit sideguides 49 assist in the proper formation of the coil and prevent the coil from forming into a telescope configuration.
  • Peeler 52 normally remains in its retracted position and is not used in the normal operation of coiler 40. However, in emergencies it can be moved into operating position by its drive mechanism 53 and operates to separate the wraps of the coil.
  • the housing of coiler 40 includes an optional removable cover 51, which has been found not to be required, and other walls 72.
  • an entry table 73 including driven table rolls 74 on which the hot transfer bar is transported to coiler 40.
  • An exist table 75 includes driven table rolls 76 is located behind the coiler.
  • Standby exit pinch roll 50 is used only in emergencies and normally is located above the position thereof shown in FIG. 3. When it is used, as, for example, in conjunction with peeler 52, it is pivoted into the position thereof shown in FIG. 3 and cooperates with one of rolls 76 to form'a pinch roll unit.
  • the location of cradle rolls 68-70 and their speed of rotation relative to the speed of rotation of bending rolls 57-59 is important in ensuring the formation of a proper coil.
  • the coil initially is formed on rolls 69 and 70, i.e., during the initial formation of the coil, the curved transfer bar from the set of bending rolls contacts rolls 69 and 70, but not roll 68. After the coilbeing formed has become quite large, contact is made with rolls 68 and 69, and contact with roll 70 is broken.
  • cradle rolls 68-70 The location of cradle rolls 68-70 relative to bending rolls 57-59 and the speed of the latter relative to the former must be selected such that the curved transfer bar emerging from the bending roll unit is prevented from following the path that it otherwise would be striking itself somewhere near the entry point to the three roll bending unit and instead is formed into a tight, circular coil.
  • Many different locations and speeds of the cradler rolls are possible, but, in all cases, the cradle rolls should be driven faster than bending rolls 57-59. However, care should be taken not to drive cradle rolls 68-70 so fast as to form so tight a coil as to cause scratching and galling of the rolls on the transfer bar and of the transfer bar on itself. In general, the cradle rolls should not substantially alter the velocity of the head end of the transfer bar on its first wrap.
  • mandrelless downcoiler 40 The operation of mandrelless downcoiler 40 now will be described with reference to FIGS. 5 to from which it will be noted that suitable hot metal detectors 78 and 79 are disposed over entry and exit tables 73 and 75 respectively.
  • thecomponents of the coiler Prior to initiation of the coiling operation, thecomponents of the coiler are inthe positions shown in FIG. 5, i.e., inner wrap retainer 47 retracted and bending rolls 57-59 in operative position.
  • the bending rolls all are being driven at the same speed, as are all of the cradle rolls, this being achieved via drive mechanisms 45 and 46 respectively.
  • the cradle rolls are being driven slightly faster than the bending rolls and the peripheral speed of the latter is the same as that of the transfer bar.
  • Pinch rolls 54 and 55 are driven at the same peripheral speed as that of the bending rolls.
  • Roll 54 is pivotally mounted so that after the transfer bar has reached the bending rolls, it can be raised slightly. It then functions as a guide roll rather than as a part of a pinch roll unit.
  • Hot metal detector 78 detects the head end of a hot transfer bar. If hot metal detector 79 indicates that coiler 40 is clear, the transfer bar is permitted to enter the coiler. However, if hot metal detector 79 indicates that coiler 40 is not ready to receive the transfer bar (because the previous transfer bar has not yet cleared coiler 40), the drive mechanism (not shown) for table rolls 74 is disconnected therefrom, and the transfer bar is held until the coiler is clear.
  • the aforementioned control operations may be performed electronically using equipment of known type.
  • the hot transfer bar passes through pinch roll set 41 and is guided by deflection plates 56 into bending roll set 42 where a curvature is imparted thereto.
  • the curved end of the transfer bar heads downwardly toward cradle roll set 43, contacts cradle rolls 69 and 70 and is formed into a tight coil. After the coil has become larger, it falls to the position shown in FIG. 6 where it is supported on cradle rolls 68 and 69.
  • hot metal detector 78 detects the tail end of the transfer bar
  • bending rolls 58 and 59 are retracted. This avoids putting a bend or set into the tail 'end of the transfer bar and facilitates extraction of the tail end prior to encoiling.
  • other techniques than using a hot metal detector for sensing the tail end of the transfer bar and retracting bending rolls 58 and 59 may be employed. For example, the quantity of steel passing through the pinch rolls may be measured and the bending rolls retracted shortly before all of the transfer bar passes through the bending roll set.
  • hot metal detector 79 detects the presence of the hot transfer bar, a signal is produced that is supplied to a control system for the drive mechanism of bending rolls 58 and 59 and these are returned to their operative position as shown in FIG. 8. In addition, this signal may be used to activate the crop shear.
  • any suitable device may be employed to determine when the uncoiling operation is near its end and, as shown in FIG. 9, activate inner wrap retainer 47.
  • This retainer is inserted through the hollow core of the coil and serves to retain the last few wraps of the coil during the uncoiling operation.
  • hot metal detector 79 ceases to'detect hot metal indicating that the transfer bar has cleared the coiler, a signal is derived and used to reset the coiler (inner wrap retainer 47 returned to its retracted position), release an interlock on hot metal detector 78 to permit the next transfer bar to enter coiler 40 and activate crop shear for a tail end (previously the head end of the transfer bar) cut.
  • Apparatus for processing hot metal workpieces comprising first and second spaced apart rolling mills for rolling a hot metal workpiece to increase the length i and decrease the thickness thereof, a mandrelless downcoiler for coiling a hot metal workpiece rolled in said first rolling mill prior to delivery of said hot metal workpiece to said second rolling mill, said mandrelless downcoiler having separate spaced apart entrance and exit regions a bending roll unit for bending said hot metal workpiece to impart a curvature thereto, means for driving said bending roll unit, cradle rolls located below said bending roll unit and against which the coil formed in said mandrelless downcoiler bears and means for driving said cradle rolls in opposite directions to wind said coil in one direction and unwind said coil in the opposite direction, said cradle rolls having axes of rotation that remain fixed during coiling and uncoiling, said bending roll unit being arranged to impart a curvature to said hot metal workpiece such that the coil formed in said downcoiler is
  • said mandrelless downcoiler includes pinch rolls between which said hot metal workpiece rolled in said first rolling mill passes before being coiled in said coiler, means for driving said pinch rolls, and means located between said pinch rolls and said bending roll unit for guiding said hot metal workpiece from said pinch rolls to said bending roll unit, said bending roll unit comprising at least three bending rolls.
  • mandrelless downcoiler includes an inner wrap retainer adapted to be inserted into the hollow core of said coil during the last stages of uncoiling of said coil to retain the inner wraps of said coil during final uncoiling of said coil, and means for moving said inner wrap retainer into and out of the core of said coil.
  • a mandrelless downcoiler having separate spaced apart entrance and exit regions for entrance of a workpiece to be coiled into said downcoiler and exit of said workpiece from said downcoiler during uncoiling of the coil formed in said downcoiler, a bending roll unit for bending a workpiece to impart a curvature thereto, said bending roll unit comprising at least three bending rolls, driving means for rotating said bending rolls, at least two cradle rolls located below said bending roll unit and against at least one of which the coil formed in said downcoiler bears during coil formation and driving means for rotating said cradle rolls in opposite directions to wind said coil in one direction and unwind said coil in the opposite direction, said cradle rolls having axes of rotation that remain fixed during coiling and uncoiling, said bending roll unit being arranged to impart a curvature to said workpiece such that the coil formed in said downcoiler is formed in a counterclockwise direction when viewed from the west considering said workpiece on entering said
  • a mandrelless downcoiler including pinch rolls for receiving a metal workpiece to be coiled by said downcoiler and driving means for rotating said pinch rolls, said bending roll unit being located to receive a metal workpiece transferred thereto from said pinch rolls.
  • a mandrelless downcoiler including means for guiding said workpiece from said pinch rolls to said bending roll unit.
  • a mandrelless downcoiler including an inner wrap retainer adapted to be inserted into the hollow core of said coil during the last stages of uncoiling of said coil to retain the inner wraps of said coil during final uncoiling of said coil and means for moving said inner wrap retainer into and out of the core of said coil.
  • a mandrelless downcoiler according to claim 6 including means for moving at least one of said bending rolls towards and away from the other of said bending rolls.
  • a method for processing hot metal workpieces which comprises the following steps:

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US00305995A 1971-11-15 1972-11-13 Method and apparatus for rolling hot metal workpieces and coiler for use in coiling hot metal workpieces Expired - Lifetime US3805570A (en)

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GB5299571A GB1373375A (en) 1971-11-15 1971-11-15 Method for rolling hot metal workpieces
GB5285672A GB1373376A (en) 1971-11-15 1972-11-15 Method and apparatus for rolling hot metal workpieces and coiler for use in coiling hot metal workpieces

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AU (2) AU460341B2 (sv)
BE (2) BE816816Q (sv)
CA (2) CA950244A (sv)
DE (3) DE2256024C2 (sv)
FR (2) FR2160499B1 (sv)
GB (2) GB1373375A (sv)
NL (2) NL150697B (sv)
SE (3) SE423048B (sv)

Cited By (14)

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US4005830A (en) * 1974-05-06 1977-02-01 The Steel Company Of Canada, Limited Mandrelless downcoiler for coil box
US4019359A (en) * 1974-05-06 1977-04-26 The Steel Company Of Canada, Limited Method of hot rolling metal strip
FR2464760A1 (fr) * 1979-09-12 1981-03-20 White Consolidated Ind Inc Installation et procede de laminage a chaud de pieces de metal pour former des bandes ou des toles
US4297865A (en) * 1979-03-30 1981-11-03 The Steel Company Of Canada, Ltd. Metal strip downcoilers
US4319474A (en) * 1980-03-10 1982-03-16 Davy-Loewy Limited Rolling method and apparatus
US4384468A (en) * 1981-09-29 1983-05-24 Tippins Machinery Company, Inc. Method and apparatus for coiling strip on a hot mill
USRE31344E (en) * 1979-09-12 1983-08-16 White Consolidated Industries, Inc. Semi-continuous hot rolling of metal strip and plates
US5499523A (en) * 1993-10-19 1996-03-19 Danieli United, Inc. Method for producing metal strips having different thicknesses from a single slab
US6009736A (en) * 1998-08-14 2000-01-04 Danieli United A Division Of Danieli Corporation Superlarge coil handling system for hot strip mill
US6082659A (en) * 1997-07-15 2000-07-04 Kaiser Aluminum & Chemical Corp. High speed transfer of strip in a continuous strip processing application
US20050150995A1 (en) * 2002-05-29 2005-07-14 Barbara Ladda-Zunk Coil box, mounted between a roughing rolling train and a finishing rolling train
US20070012082A1 (en) * 2003-08-22 2007-01-18 Klaus Baumer Coilbox located between the roughing train and finishing train in a hot-rolling mill
US20090211324A1 (en) * 2008-02-21 2009-08-27 Mckenney Carl Active transfer apparatus for hot strip mill coilbox
US20170348747A1 (en) * 2014-12-10 2017-12-07 Sms Group Gmbh Apparatus for winding up a metal strip

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DE2600784C3 (de) * 1976-01-10 1978-11-09 Hoesch Werke Ag, 4600 Dortmund Verfahren zum Walzen von Warmband und Warmbandwalzwerk zur Durchführung des Verfahrens
JPS52109464A (en) * 1976-03-10 1977-09-13 Nippon Steel Corp Continuous casting continuous hot rolling device train
US4308739A (en) * 1980-01-28 1982-01-05 Tippins Machinery Company, Inc. Method for modernizing a hot strip mill
US4348882A (en) * 1980-01-28 1982-09-14 Tippins Machinery Company, Inc. Hot rolling strip
DE3063726D1 (en) * 1980-03-04 1983-07-21 Davy Mckee Sheffield Rolling method and apparatus
US4430874A (en) * 1981-09-29 1984-02-14 Tippins Machinery Company, Inc. Vertical coiler furnace and method of rolling
US4433566A (en) 1981-09-29 1984-02-28 Tippins Machinery Company, Inc. Close coupled reversing rougher and finishing train and method of rolling
AT380188B (de) * 1982-03-05 1986-04-25 Voest Alpine Ag Anlage zum warmwalzen von band- oder tafelfoermigem walzgut
US4505141A (en) * 1982-07-13 1985-03-19 Tippins Machinery Company, Inc. Apparatus for thermomechanically rolling hot strip product to a controlled microstructure
US4491006A (en) * 1983-05-16 1985-01-01 Tippins Machinery Company, Inc. Method and apparatus for coiling strip between the roughing train and the finishing train
DE3743057C1 (de) * 1987-12-18 1988-09-01 Krupp Gmbh Verfahren und Anlage zum Herstellen von warmgewalztem Band aus stranggegossenem Vormaterial
EP0327855B1 (de) * 1988-02-10 1992-04-22 Sms Schloemann-Siemag Aktiengesellschaft Anlage zum Walzen von Metallband unmittelbar hinter der Stranggiessanlage
JPH0446602A (ja) * 1990-06-11 1992-02-17 Ishikawajima Harima Heavy Ind Co Ltd 熱間粗圧延設備
DE19750815B4 (de) * 1997-11-17 2006-09-28 Sms Demag Ag Biegevorrichtung für ein Metallband
DE19750998C1 (de) * 1997-11-18 1999-08-19 Thyssenkrupp Stahl Ag Coilboxofen
JP5271512B2 (ja) 2007-06-18 2013-08-21 Ｉｈｉメタルテック株式会社 熱間圧延装置
RU2743386C1 (ru) * 2020-08-31 2021-02-17 Публичное Акционерное Общество "Новолипецкий металлургический комбинат" Способ прокатки и транспортировки тонких полос по отводящему рольгангу широкополосного стана
CN113399468B (zh) * 2021-06-18 2022-08-12 首钢长治钢铁有限公司 一种高速棒材尾钢长度优化控制装置及优化方法

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FR797273A (fr) * 1934-11-23 1936-04-23 Schloemann Ag Dispositif pour dérouler les rouleaux de feuillard de fer et les rouleaux de matières analogues
US2078005A (en) * 1934-12-26 1937-04-20 W C Coryell Mill plant for rolling hot metal
US2658741A (en) * 1949-04-11 1953-11-10 Westfalenhutte Dortmund Ag Rolling mill for rolling strips or bands and sheets of steel and nonferrous metals
US2920838A (en) * 1956-11-01 1960-01-12 United Eng Foundry Co Strip coiling apparatus

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DE577699C (de) * 1933-06-02 Schloemann Akt Ges Aufrollmaschine fuer Eisen- und Metallbaender fuer den Wickelbund bei Walzwerken
FR1038329A (sv) * 1953-09-28
DE464215C (de) * 1927-04-26 1928-08-10 Bauer Alfred Maschine zum Entrollen und Flachstrecken von gegluehten Bandwickeln bei Kaltwalzwerken
US2096713A (en) * 1932-11-10 1937-10-26 American Rolling Mill Co Device for and process of uncoiling metal coils
US2070444A (en) * 1934-07-20 1937-02-09 Treadwell Engineering Company Strip uncoiling machine
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US2965328A (en) * 1956-08-23 1960-12-20 Alvin F Groll Device for peeling strip metal from coils thereof
DE1158024B (de) * 1960-03-24 1963-11-28 Verwaltungsgesellschaft Moelle Warmblech-Walzwerk
AT262727B (de) * 1964-12-01 1968-06-25 Avi Alpenlaendische Vered Anordnung zur Entnahme von bandförmigem Material, insbesondere Bewehrungsgitter für Stahlbetonbauten, von einer Materialrolle

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Publication number Priority date Publication date Assignee Title
US361591A (en) * 1887-04-19 Art of rolling wire rods
US1029673A (en) * 1906-05-16 1912-06-18 American Steel & Wire Co Rod-mill.
FR797273A (fr) * 1934-11-23 1936-04-23 Schloemann Ag Dispositif pour dérouler les rouleaux de feuillard de fer et les rouleaux de matières analogues
US2078005A (en) * 1934-12-26 1937-04-20 W C Coryell Mill plant for rolling hot metal
US2658741A (en) * 1949-04-11 1953-11-10 Westfalenhutte Dortmund Ag Rolling mill for rolling strips or bands and sheets of steel and nonferrous metals
US2920838A (en) * 1956-11-01 1960-01-12 United Eng Foundry Co Strip coiling apparatus

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005830A (en) * 1974-05-06 1977-02-01 The Steel Company Of Canada, Limited Mandrelless downcoiler for coil box
US4019359A (en) * 1974-05-06 1977-04-26 The Steel Company Of Canada, Limited Method of hot rolling metal strip
US4297865A (en) * 1979-03-30 1981-11-03 The Steel Company Of Canada, Ltd. Metal strip downcoilers
FR2464760A1 (fr) * 1979-09-12 1981-03-20 White Consolidated Ind Inc Installation et procede de laminage a chaud de pieces de metal pour former des bandes ou des toles
US4296623A (en) * 1979-09-12 1981-10-27 Blaw-Knox Foundry & Mill Machinery, Inc. Semi-continuous hot rolling of metal strip and plates
USRE31344E (en) * 1979-09-12 1983-08-16 White Consolidated Industries, Inc. Semi-continuous hot rolling of metal strip and plates
US4319474A (en) * 1980-03-10 1982-03-16 Davy-Loewy Limited Rolling method and apparatus
US4384468A (en) * 1981-09-29 1983-05-24 Tippins Machinery Company, Inc. Method and apparatus for coiling strip on a hot mill
US5499523A (en) * 1993-10-19 1996-03-19 Danieli United, Inc. Method for producing metal strips having different thicknesses from a single slab
US6082659A (en) * 1997-07-15 2000-07-04 Kaiser Aluminum & Chemical Corp. High speed transfer of strip in a continuous strip processing application
US6009736A (en) * 1998-08-14 2000-01-04 Danieli United A Division Of Danieli Corporation Superlarge coil handling system for hot strip mill
US20050150995A1 (en) * 2002-05-29 2005-07-14 Barbara Ladda-Zunk Coil box, mounted between a roughing rolling train and a finishing rolling train
US7293446B2 (en) * 2002-05-29 2007-11-13 Sms Demag Ag Coil box, mounted between a roughing rolling train and a finishing rolling train
US20070012082A1 (en) * 2003-08-22 2007-01-18 Klaus Baumer Coilbox located between the roughing train and finishing train in a hot-rolling mill
US7942029B2 (en) 2003-08-22 2011-05-17 Sms Siemag Aktiengesellschaft Coil box between roughing train and finishing train in a rolling mill
US20090211324A1 (en) * 2008-02-21 2009-08-27 Mckenney Carl Active transfer apparatus for hot strip mill coilbox
US8281633B2 (en) 2008-02-21 2012-10-09 Hatch Ltd. Active transfer apparatus for hot strip mill coilbox
US20170348747A1 (en) * 2014-12-10 2017-12-07 Sms Group Gmbh Apparatus for winding up a metal strip
US10906078B2 (en) * 2014-12-10 2021-02-02 Sms Group Gmbh Apparatus for winding up a metal strip

Also Published As

Publication number Publication date
FR2160500B1 (sv) 1976-10-29
CA950243A (en) 1974-07-02
JPS5030028B2 (sv) 1975-09-27
JPS4961044A (sv) 1974-06-13
NL7214792A (sv) 1973-05-17
AU4825972A (en) 1974-05-02
FR2160500A1 (sv) 1973-06-29
JPS5316380B2 (sv) 1978-05-31
JPS4862652A (sv) 1973-09-01
DE2264788A1 (de) 1975-01-23
GB1373375A (en) 1974-11-13
AU453530B2 (en) 1974-10-03
BE816816Q (fr) 1974-12-27
AU4825772A (en) 1974-05-02
AU460341B2 (en) 1975-04-24
NL150697B (nl) 1976-09-15
SE423048B (sv) 1982-04-13
DE2256030C2 (de) 1982-12-09
CA950244A (en) 1974-07-02
DE2256030A1 (de) 1973-05-24
SE7412032L (sv) 1974-09-25
DE2256024C2 (de) 1983-08-11
FR2160499A1 (sv) 1973-06-29
US3803891A (en) 1974-04-16
NL7214793A (sv) 1973-05-17
SE382306B (sv) 1976-01-26
BE816817Q (fr) 1974-12-27
JPS4862651A (sv) 1973-09-01
DE2264788C2 (de) 1984-08-23
GB1373376A (en) 1974-11-13
DE2256024A1 (de) 1973-05-24
JPS5126317B2 (sv) 1976-08-05
FR2160499B1 (sv) 1980-04-18

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