US3803891A - Method for rolling hot metal workpieces - Google Patents

Method for rolling hot metal workpieces Download PDF

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US3803891A
US3803891A US00306013A US30601372A US3803891A US 3803891 A US3803891 A US 3803891A US 00306013 A US00306013 A US 00306013A US 30601372 A US30601372 A US 30601372A US 3803891 A US3803891 A US 3803891A
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Prior art keywords
mill
hot metal
coiler
metal workpiece
rolling
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US00306013A
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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

  • This invention relates to methods for rolling hot metal workpieces, particularly steel, although the invention may be applied to the hot rolling of other metals, such as aluminum, for example.
  • 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 the finishing mill.
  • 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 1 inches 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 finishingmill train where it is further reduced to the desired gauge.
  • zoom rolling involves accelerating the tinishing 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 high pressure water descaling unit is employed, this unit being located just ahead of the finishing mill train. of course, such treatment drastically reduces the temperatureof the transfer bar, and additional -mill rolling horsepower is required to compensate for this reduction in temperature.
  • 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 inches 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:
  • the rolling of hot metal workpieces in a rolling mill of the type that includes a roughing mill comprising a reversing roughing mill stand, a finishing mill comprising at least one finishing mill stand and coiler means located between the roughing and finishing mills for coiling a hot metal workpiece delivered thereto from the roughing mill before the hot metal workpiece is rolled in the finishing mill is accomplished utilizing the following steps:
  • FIG. 1 is a schematic top elevation of a conventional, fully continuous hot strip mill
  • FIG. 2 is a schematic top elevation of a conventional semi-continuoushot strip mill
  • FIGS. 3 and 4 are schematic top and side elevations respectively of a semi-continuous hot strip mill constituting a preferred embodiment of this invention
  • FIG. 5 is a diagram showing the relative lengths and I thicknesses of a slab and transfer bar processed in the apparatus of FIGS. 3 and 4;
  • FIG. 6 is a side elevation, partly in section, of a coiler that may be used in practising this invention.
  • FIG. 7 is a top elevation of the coiler shown in FIG. 6;
  • FIGS. 8-13 are schematic side elevations of the coiler shown in FIG. 6 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, l4, l5, l6 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, l4, l5, l6 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
  • the conventional, semi-continuous hot strip mill of FIG. 2 also is arranged to roll 1,000 P.I.W. strip and differs from the hot strip mill of FIG. 1 in that its roughing mill consists of a single reversing roughing mill stand 28 rather than direct rolling roughing mill stands 13-17. Similar components in the two Figures (and in FIGS. 3 and 4) are identified by the same reference numerals.
  • FIGS. 3 and 4 illustrate a preferred embodiment of this invention and show a semi-continuous hot strip mill also arranged to roll 1,000 P.I.W. strip. It differs from the mill of FIG. 2 in that it includes a coiler 29 located between reversing roughing mill stand 28 and the first finishing mill stand 19. More specifically, coiler 29 is located between reversing roughing mill stand 28 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 18 and finishing mill stand 19, all of which are conventional. It also should be understood that the number and type of stands that constitute the finishing mill, the type, location and even provision of a crop shear, and the number and type of coilers 25-27 are not material to this invention.
  • coiler 29 is of a type that accepts the hot metal strip from reversing roughing mill stand 28 head end first, coils the hot metal strip and then delivers it tail end first to the finishing mill.
  • Coiler 29 also preferably is a mandrelless coiler, since a coiler of this type offers a number of advantages which will become more apparent hereinafter.
  • a mandrelless coiler that may be used in methods embodying this invention is illustrated in FIGS. 6 and 7 and will be described in greater detail hereinafter. In fact this mandrelless coiler is a mandrelless downcoiler, but it might also be an upcoiler.
  • FIGS. 3 and 4 The operation of the apparatus shown in FIGS. 3 and 4 and a preferred method embodying this invention FIGS. 3 and 4 achieved by passing the hot metal workpiece or transfer bar back and forth through the reversing roughing mill stand in a series of passes from one side thereof to the other side thereof and vice-versa.
  • the transfer bar is passed through the reversing roughing mill stand five times;
  • the slab 30 delivered from furnace 10 to reversing roughing mill stand 28 may have a length of 32 feet and a thickness of 10 inches.
  • the length and thickness of the slab changes as it is passed through reversing roughing mill stand 28, and the changes in dimension are illustrated in FIG.
  • the various transfer bars after'each pass being designated 30a, 30b, 30c, 30d and 30e. It will be seen that on the third last pass of the transfer bar through reversing roughing mill stand 28, the transfer bar is passed from the side of reversing roughing mill stand 28 further from coiler 29 to the side thereof closer to coiler 29 and is lengthened from 54 ft. to 80 ft. its thickness being correspondingly diminished. It will be seen from FIG. 3 that the distance between reversing roughing mill stand 28-and coiler 29 is slightly greater than 80 ft.
  • the transfer bar be rolled to a length that is less than the spacing between reversing roughing mill stand 28 and coiler 29, since entry of the transfer bar into coiler 29 is not desired on this particular pass.
  • the transfer bar is further lengthened from 80 ft. to 160 ft. and its thickness correspondingly reduced.
  • the transfer bar again is passed from the side of reversing roughing mill stand 28 further from coiler 29 to the side thereof closer to coiler 29 but, unlike the third last pass, is rolled to a length that is considerably greater than the spacing between reversing rolling mill stand 28 and coiler 29.
  • the transfer bar is rolled'to a length of 320 ft., whereas the spacing between reversing roughing mill stand 28 and coiler 29 is 105 ft.
  • transfer bar 302 should be as long as possible consistent with transfer bar 300 being of a length less than the spacing between reversing roughing mill stand 28 and coiler 29.
  • transfer bar 30e is considerably longer than the distance between reversing roughing mill stand 28 and crop shear l8 and, even more preferably, is considerably longer than the spacing between reversing roughing mill stand 28 and finishing mill stand 19.
  • Transfer bar 30 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 mills of FIGS. 1 and 2 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.
  • transfer bar 302 After transfer bar 302 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.
  • a mandrelless downcoiler that may be used for coiler 29 will be described hereinafter.
  • the transfer bar 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.
  • 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.
  • coiler 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 feet or 260 feet, resulting in a considerable capital cost saving.
  • FIGS. 1-4 Another significant advantage of the method constituting this invention can be seen by comparing the lengths of the runout tables in FIGS. 1-4, this length being the distance between the last finishing mill stand 24 and the first coiler 25.
  • the runout tables are 530 feet in length.
  • the runout table in FIGS. 3 and 4 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 strip is coiled. In conventional, hot strip mills the transfer bar is accelerated during passage through the finishing mill, so the runout table must be sufficiently long to allow adequate cooling of the strip exiting 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.
  • this invention may be practised with an existing, conventional semicontinuous hot strip mill of the type shown in FIG. 2. 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 virture of its ability to accommodate a transfer bar on the final pass through reversing roughing mill stand 28 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 e.g. 62 inches wide, 0.09 inches 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 inches 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.
  • transfer bar 302 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 transfer bar 30c 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 transfer bar 30c entering the first finishing mill 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 transfer bar 30e 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 steels 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.
  • hot strip 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 hot transfer bar 30e could be stored in coiler 29 until the cobble was cleared.
  • hot strip mill transfer bar 30e may come into the first finishing mill stand at the relatively high temperature of about 1950F 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.
  • the temperature differential between the mandrel (generally at l,600F. or less) and the hot transfer bar (at about l950F.) causes the end of the bar adjacent the mandrel to be colder than theremainder of the bar and results in a product with varying metallurgical properties. While this latter problem could be overcome by increasing the temperature of the mandrel to the same temperature as that of the transfer bar, this would result in a material decrease in the life of the mandrel and also would result in the phenomenon known as pressure welding. As long as these disadvantages can be tolerated, however, coiler 29 may be of a type employing a mandrel.
  • Mandrelless coiler can be used for the coiling of a hot transfer bar and avoids the aforementioned disadvantages of a coiler having a mandrel.
  • Mandrelless coilers have been used in the past for coiling cold strip, but their use for coiling a hot transfer bar is believed to be unique. While either a mandrelless up-.
  • coiler or a mandrelless downcoiler can be used, the latter is preferred because the former 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.
  • FIG. '6 to 13 inclusive Shown in FIG. '6 to 13 inclusive is 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.
  • Bearing blocks 60 and 611 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 hearing 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 coiler 40.
  • screw jacks or other devices may be used for moving rolls 58 and 59.
  • rolls 57, 56, and 59 When rolls 57, 56, and 59 are in the position shown in FIG. 6, 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 operative 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 exit table 75 including 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. 6. When it is used, as, for example, in conjunction with peeler 52, it is pivoted into the position thereof shown in FIG. 6 and cooperates with one of rolls 76 to form a pinch roll unit.
  • the location of cradle rolls 60-70 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 coil being 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 and 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 cradle 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. 8 to 13 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.
  • the components of the coiler Prior to initiation of the coiling operation, the components of the coiler are in the positions'shown in FIG. 8, 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.
  • I-Iot 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. 9 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 uncoiling.
  • 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. 11. 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. 12, 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.
  • a mandrelless upcoiler although less preferred than a mandrelless downcoiler, could be used in place thereof. It will be understood that whereas in a mandrelless downcoiler the end of the transfer bar that first enters the downcoiler bends downwardly to form a coil, in a mandrelless upcoiler this end bends upwardly to form a coil.
  • a method for processing hot metal workpieces in a rolling mill of the type that includes a first mill comprising a reversing mill stand, a second mill comprising at least one mill stand and coiler means located between said first and second mills for coiling a hot metal workpiece delivered thereto from said first mill before said hot metal workpiece is rolled in said second mill, said method comprising the following steps:
  • said rolling mill includes a crop shear located between said coiler means and said second mill and wherein on said lastpass through said reversing mill stand said hot metal workpiece is rolled to a length greater than the spacing between said reversing mill stand and said crop shear.
  • said hot metal workpiece has a head end and a tail end, said hot metal workpiece being delivered to and coiled in said coiler means head end first but being delivered from said coiler means tail end first, wherein said first mill is a roughing milland said second mill is a finishing mill and wherein said rolling mill is a hot strip mill and said hot metal workpiece delivered to said second mill is a hot metal strip.
  • hot metal workpiece delivered to said second mill is a hot metal strip.
US00306013A 1971-11-15 1972-11-13 Method for rolling hot metal workpieces Expired - Lifetime US3803891A (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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US00305995A Expired - Lifetime US3805570A (en) 1971-11-15 1972-11-13 Method and apparatus for rolling hot metal workpieces and coiler for use in coiling hot metal workpieces

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JP (3) JPS5030028B2 (de)
AU (2) AU453530B2 (de)
BE (2) BE816816Q (de)
CA (2) CA950244A (de)
DE (3) DE2256024C2 (de)
FR (2) FR2160500B1 (de)
GB (2) GB1373375A (de)
NL (2) NL7214792A (de)
SE (3) SE423048B (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US4308739A (en) * 1980-01-28 1982-01-05 Tippins Machinery Company, Inc. Method for modernizing a hot strip mill
US4319474A (en) * 1980-03-10 1982-03-16 Davy-Loewy Limited Rolling method and apparatus
US4348882A (en) * 1980-01-28 1982-09-14 Tippins Machinery Company, Inc. Hot rolling strip
USRE31344E (en) * 1979-09-12 1983-08-16 White Consolidated Industries, Inc. Semi-continuous hot rolling of metal strip and plates
EP0099520A2 (de) * 1982-07-13 1984-02-01 Tippins Incorporated Verfahren und Vorrichtung zum thermomechanischen Walzen von Warmband oder Blechen zur Erreichung eines kontrollierten Mikrogefüges
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
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
US4497191A (en) * 1982-03-05 1985-02-05 Voest-Alpine Aktiengesellschaft Plant and process for hot-rolling strip or plate stock
EP0461743A2 (de) * 1990-06-11 1991-12-18 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Warmwalzanlage
US6009736A (en) * 1998-08-14 2000-01-04 Danieli United A Division Of Danieli Corporation Superlarge coil handling system for hot strip mill
WO2005028136A1 (de) * 2003-08-22 2005-03-31 Sms Demag Aktiengesellschaft Colibox zwischen vorstrasse und fertigstrasse im warmwalzwerk
US20100180655A1 (en) * 2007-06-18 2010-07-22 Kengo Ishige Hot rolling apparatus
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
CN113399468A (zh) * 2021-06-18 2021-09-17 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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GB1507827A (en) * 1974-05-06 1978-04-19 Canada Steel Co Handling rolled transfer bars
US4019359A (en) * 1974-05-06 1977-04-26 The Steel Company Of Canada, Limited Method of hot rolling metal strip
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
ZA801524B (en) * 1979-03-30 1981-08-26 Canada Steel Co Metal strip downcoilers-u
DE3063726D1 (en) * 1980-03-04 1983-07-21 Davy Mckee Sheffield 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
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
US5499523A (en) * 1993-10-19 1996-03-19 Danieli United, Inc. Method for producing metal strips having different thicknesses from a single slab
WO1999003615A1 (en) * 1997-07-15 1999-01-28 Kaiser Aluminum & Chemical Corporation High speed transfer of strip in a continuous strip processing application
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
DE10223905A1 (de) * 2002-05-29 2003-12-11 Sms Demag Ag Coilbox, die zwischen Vor- und Fertigwalzstraßen angeordnet ist
US8281633B2 (en) * 2008-02-21 2012-10-09 Hatch Ltd. Active transfer apparatus for hot strip mill coilbox
WO2016091855A1 (de) * 2014-12-10 2016-06-16 Sms Group Gmbh Vorrichtung zum aufwickeln eines metallischen bandes

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US1029673A (en) * 1906-05-16 1912-06-18 American Steel & Wire Co Rod-mill.
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 (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
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
US4319474A (en) * 1980-03-10 1982-03-16 Davy-Loewy Limited Rolling method and apparatus
US4433566A (en) 1981-09-29 1984-02-28 Tippins Machinery Company, Inc. Close coupled reversing rougher and finishing train and method of rolling
US4430874A (en) * 1981-09-29 1984-02-14 Tippins Machinery Company, Inc. Vertical coiler furnace and method of rolling
US4497191A (en) * 1982-03-05 1985-02-05 Voest-Alpine Aktiengesellschaft Plant and process for hot-rolling strip or plate stock
EP0099520A2 (de) * 1982-07-13 1984-02-01 Tippins Incorporated Verfahren und Vorrichtung zum thermomechanischen Walzen von Warmband oder Blechen zur Erreichung eines kontrollierten Mikrogefüges
EP0099520A3 (en) * 1982-07-13 1985-07-31 Tippins Machinery Company, Inc. Method and 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
EP0461743A2 (de) * 1990-06-11 1991-12-18 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Warmwalzanlage
EP0461743A3 (en) * 1990-06-11 1992-03-11 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Hot roughing mill installation
US6009736A (en) * 1998-08-14 2000-01-04 Danieli United A Division Of Danieli Corporation Superlarge coil handling system for hot strip mill
WO2005028136A1 (de) * 2003-08-22 2005-03-31 Sms Demag Aktiengesellschaft Colibox zwischen vorstrasse und fertigstrasse im warmwalzwerk
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
US20100180655A1 (en) * 2007-06-18 2010-07-22 Kengo Ishige Hot rolling apparatus
US8555687B2 (en) 2007-06-18 2013-10-15 Ihi Corporation Hot rolling apparatus
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
CN113399468A (zh) * 2021-06-18 2021-09-17 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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DE2256030A1 (de) 1973-05-24
DE2256024A1 (de) 1973-05-24
AU453530B2 (en) 1974-10-03
DE2264788C2 (de) 1984-08-23
NL7214792A (de) 1973-05-17
FR2160499B1 (de) 1980-04-18
AU4825772A (en) 1974-05-02
DE2256024C2 (de) 1983-08-11
NL150697B (nl) 1976-09-15
JPS4862652A (de) 1973-09-01
BE816816Q (fr) 1974-12-27
CA950244A (en) 1974-07-02
SE382306B (sv) 1976-01-26
JPS4862651A (de) 1973-09-01
JPS5126317B2 (de) 1976-08-05
CA950243A (en) 1974-07-02
AU4825972A (en) 1974-05-02
GB1373376A (en) 1974-11-13
SE423048B (sv) 1982-04-13
DE2264788A1 (de) 1975-01-23
JPS5030028B2 (de) 1975-09-27
DE2256030C2 (de) 1982-12-09
BE816817Q (fr) 1974-12-27
JPS5316380B2 (de) 1978-05-31
AU460341B2 (en) 1975-04-24
NL7214793A (de) 1973-05-17
US3805570A (en) 1974-04-23
GB1373375A (en) 1974-11-13
JPS4961044A (de) 1974-06-13
FR2160499A1 (de) 1973-06-29
SE7412032L (de) 1974-09-25
FR2160500B1 (de) 1976-10-29
FR2160500A1 (de) 1973-06-29

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