US20160230246A1 - Wire rod cooling device and wire rod cooling method - Google Patents

Wire rod cooling device and wire rod cooling method Download PDF

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Publication number
US20160230246A1
US20160230246A1 US15/021,553 US201415021553A US2016230246A1 US 20160230246 A1 US20160230246 A1 US 20160230246A1 US 201415021553 A US201415021553 A US 201415021553A US 2016230246 A1 US2016230246 A1 US 2016230246A1
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Prior art keywords
wire rod
jet nozzle
coolant
jet
information
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Abandoned
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US15/021,553
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English (en)
Inventor
Kazumoto TSUKAKOSHI
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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Assigned to NIPPON STEEL & SUMITOMO METAL CORPORATION reassignment NIPPON STEEL & SUMITOMO METAL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TSUKAKOSHI, Kazumoto
Publication of US20160230246A1 publication Critical patent/US20160230246A1/en
Assigned to NIPPON STEEL CORPORATION reassignment NIPPON STEEL CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: NIPPON STEEL & SUMITOMO METAL CORPORATION
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/008—Rollers for roller conveyors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C21D9/5732—Continuous furnaces for strip or wire with cooling of wires; of rods

Definitions

  • the present invention relates to a wire rod cooling apparatus and a wire rod cooling method in which a wire rod formed by hot rolling of a steel piece is wound in a shape of non-concentric rings and then the wire rod being transferred on a conveyor is subjected to controlled cooling.
  • a wire rod formed by hot rolling of a steel piece is cooled to approximately 800 to 900° C. by a water cooling means, and is then wound in a shape of non-concentric rings by a laying head (wire rod winder).
  • the wound non-concentric ring-shaped wire rod (hereinafter, occasionally referred to as simply a “ring-shaped wire rod”) is transferred on a conveyor provided on the exit side of the laying head, and is further cooled by a cooling apparatus while being transferred.
  • the water cooling and the cooling after winding are called controlled cooling, and are an important process that determines the structure, mechanical properties, and surface conditions of the wire rod.
  • a slit nozzle is provided below a roller conveyor or a chain conveyor over the entire area in the width direction of the conveyor (the direction orthogonal to the transfer direction in a planar view; hereinafter, referred to as simply a “width direction”), and coolant is sprayed from the slit nozzle toward the ring-shaped wire rod; thereby, the cooling of the ring-shaped wire rod is performed.
  • the wire rod In both end portions in the width direction of the ring-shaped wire rod that is being transferred on the conveyor, there are many portions where parts of the wire rod overlap, and the wire rod is dense (hereinafter, occasionally referred to as a “dense-in-width-direction portion”). On the other hand, in the central portion in the width direction of the ring-shaped wire rod, the wire rod is sparse as compared to the dense-in-width-direction portion (hereinafter, occasionally referred to as a “sparse-in-width-direction portion”).
  • Both portions are at the same temperature immediately after winding, but when the ring-shaped wire rod is cooled while being transferred under conditions where a uniform amount of coolant is sprayed in the width direction, a temperature difference occurs gradually between the dense-in-width-direction portion and the sparse-in-width-direction portion of the ring-shaped wire rod being transferred, because it is less easy for coolant to pass through the dense-in-width-direction portion.
  • a cooling apparatus taking into consideration the sparseness and denseness in the width direction of the ring-shaped wire rod, there is a cooling apparatus described in Patent Literature 1, for example.
  • a slit nozzle is provided only in both end portions in the width direction of the ring-shaped wire rod, that is, in the dense-in-width-direction portion, not over the entire area in the width direction.
  • the dense-in-width-direction portion which is at a relatively high temperature as compared to the sparse-in-width-direction portion, can be intensely cooled, and the temperature unevenness of the entire wire rod can be reduced.
  • cooling apparatus described in Patent Literature 2 as another cooling apparatus.
  • a guide that causes the ring-shaped wire rod to meander is provided on a roller conveyor, and the position of the individual ring is shifted to change the position where the dense-in-width-direction portion is formed; consequently, the density of the portion that has been the previous dense-in-width-direction portion is reduced.
  • the temperature difference between the dense-in-width-direction portion and the sparse-in-width-direction portion of the ring-shaped wire rod is reduced, and the temperature unevenness of the entire wire rod can be reduced.
  • the ring-shaped wire rod being transferred receives the influence of speed differences resulting from a speed variation of the rolling mill, a winding speed variation of the laying head, a speed variation of the conveyor, and the like, vibration during transfer, etc., and is not uniform in the spacing in the transfer direction between rings of the ring-shaped wire rod (hereinafter, referred to as a “ring pitch”) and the ring diameter in many cases.
  • a dense portion and a sparse portion occur not only in the width direction but also in the transfer direction.
  • the distance between adjacent rings is short and the wire rod M is dense (hereinafter, occasionally referred to as a “dense-in-transfer-direction portion”).
  • the distance between adjacent rings is long and the wire rod M is sparse as compared to the dense-in-transfer-direction portion TD (hereinafter, occasionally referred to as a “sparse-in-transfer-direction portion”).
  • the temperature of the dense-in-transfer-direction portion TD becomes higher than the temperature of the sparse-in-transfer-direction portion TS, because of the situation where the dense-in-transfer-direction portion is less easy for coolant to pass through and is cooled less easily.
  • the ring pitch is not uniform, the way that parts of the wire rod overlap is irregular.
  • FIG. 1 it is found that, on a straight line L along the transfer direction T, there is no regularity in the way that parts of the wire rod M overlap.
  • the temperature measured at the point P varies with time, and also the temperature variation is in a state of no regularity.
  • Such a phenomenon has occurred also in portions other than on the straight line L. Therefore, the temperature of the ring-shaped wire rod M in which sparseness and denseness have occurred in the transfer direction T is in a state of being complexly distributed.
  • the cooling apparatus uses a density detector to detect the linear density (sparseness and denseness) of the ring-shaped wire rod in the width direction on a time-series basis, and controls the gas flow rate of cooling gas jetted from a nozzle that is divided into a plurality of blocks in the width direction on a time-series basis. Thereby, the temperature differences in the transfer direction and the width direction of the ring-shaped wire rod can be reduced.
  • the cooling apparatus uses a scanning radiation thermometer to measure the temperature of the ring-shaped wire rod, with division into zones in an arbitrary direction with respect to the transfer direction, and adjusts the temperature and amount of coolant sprayed to the ring-shaped wire rod in accordance with the measured temperature distribution of the entire ring-shaped wire rod. Thereby, the temperature difference between portions of the ring-shaped wire rod can be reduced.
  • the temperature is high in the portion where the wire rod is dense, and the temperature is low in the portion where the wire rod is sparse.
  • the temperature is high in the portion where the wire rod is dense, and the temperature is low in the portion where the wire rod is sparse.
  • the temperatures of these portions are different temperatures during cooling, even when they are the same temperature during temperature measurement.
  • portions at different temperatures are cooled by the same amount of coolant, the ring-shaped wire rod cannot be cooled uniformly.
  • Patent Literature 4 although the amount of coolant is controlled on a zone basis, the zone basis does not make it possible to selectively cool only a specified portion that is a more local portion, and the control is less good in fineness likewise. Hence, in the cooling apparatuses described in Patent Literatures 3 and 4, it has been difficult to cope with the quick change of the specified portion.
  • the present invention has been made in view of the circumstances mentioned above, and an object of the present invention is to perform cooling taking into consideration the sparseness and denseness in the transfer direction which occur in a wire rod that is wound in a shape of non-concentric rings after hot rolling and is being transferred, and thus reduce the temperature unevenness of the entire wire rod.
  • the present invention for solving the above problems is a wire rod cooling apparatus that cools a wire rod wound in a ring shape by a wire rod winder while transferring the wire rod on a conveyor
  • the wire rod cooling apparatus including: a plurality of jet nozzles that are arranged along a width direction of the conveyor and jet coolant toward the wire rod; an imaging device that is provided on a transfer-line upstream side of a jet nozzle row composed of the plurality of jet nozzles and captures an image of the wire rod being transferred; and a control unit that extracts sparseness and denseness information and temperature information of the wire rod from the captured image.
  • the control unit is configured to control a flow rate of coolant jetted from the jet nozzles individually for each jet nozzle on the basis of the sparseness and denseness information and the temperature information of the wire rod in conformity with a timing when a specified portion corresponding to the information arrives at the jet nozzle.
  • the flow rate of coolant jetted from the jet nozzles can be controlled individually for each nozzle on the basis of the sparseness and denseness information and the temperature information of the wire rod which are extracted from the image of the wire rod being transferred on the conveyor.
  • the specified portion of the wire rod being transferred can be selectively cooled, and the amount of coolant can be controlled in accordance with the quick change of the specified portion. That is, fine control of the amount of coolant which has been unable to be achieved by conventional cooling apparatuses becomes possible.
  • the flow rate of coolant is controlled on the basis of both the sparseness and denseness information and the temperature information of the wire rod, the flow rate of coolant can be controlled appropriately even for portions where the wire rod is sparse and yet the temperature is high and portions where the wire rod is dense and yet the temperature is low, for which appropriate control has so far been unable to be made, not to mention portions where the wire rod is dense and the temperature is high and portions where the wire rod is sparse and the temperature is low.
  • cooling in which the temperature difference of the wire rod being transferred is reduced can be performed, and the temperature unevenness of the entire wire rod can be reduced. Consequently, the quality of the entire wire rod can be made uniform.
  • Pressure may be applied to coolant to be jetted from the jet nozzle.
  • a shut-off valve that shuts off jetting of coolant from the jet nozzle may be provided.
  • a plurality of the jet nozzle rows may be provided along a transfer line.
  • a plurality of the imaging devices may be provided along the transfer line, and the jet nozzle row may be provided between the imaging devices.
  • the jet nozzles may be provided so as to avoid a case where jet nozzles of the jet nozzle rows exist together on a straight line along the transfer line.
  • a slit nozzle that jets coolant toward the wire rod may be provided separately from the jet nozzle.
  • the conveyor may be a roller conveyor, a part of the roller conveyor may be formed of a disc roller including a plurality of discs, and the jet nozzle may be provided between the discs.
  • the jet nozzle row may be provided between rollers of the roller conveyor.
  • a slit nozzle that jets coolant toward the wire rod may be provided in, out of spaces between rollers of the roller conveyor, a space between rollers in which the jet nozzle row is not provided.
  • Another aspect of the present invention is a wire rod cooling method using a wire rod cooling apparatus that cools, on a conveyor, a wire rod wound in a ring shape by a wire rod winder, the method including capturing an image of the wire rod being transferred on the transfer-line upstream side of a jet nozzle row composed of a plurality of jet nozzles that are arranged along the width direction of the conveyor and jet coolant toward the wire rod, extracting sparseness and denseness information and temperature information of the wire rod from the captured image, and then controlling the flow rate of coolant jetted from the jet nozzles individually for each jet nozzle on the basis of the sparseness and denseness information and the temperature information of the wire rod in conformity with the timing at which a specified portion corresponding to the information arrives at the jet nozzle.
  • Pressure may be applied to coolant to be jetted from the jet nozzle.
  • a shut-off valve that shuts off jetting of coolant from the jet nozzle may be provided, and control of coolant jetted from the jet nozzle may be performed by controlling opening and closing of the shut-off valve.
  • a plurality of the jet nozzle rows may be provided along a transfer line and coolant may be jetted from each jet nozzle.
  • coolant may be jetted from each jet nozzle in a first jet nozzle row toward the wire rod on the basis of sparseness and denseness information and temperature information of the wire rod, then an image of the cooled wire rod may be captured again and the sparseness and denseness information and the temperature information of the wire rod may be updated on the basis of the captured image, and then a flow rate of coolant jetted from each jet nozzle in a second jet nozzle row may be controlled on the basis of the updated information in conformity with a timing when a specified portion corresponding to the information arrives at the jet nozzle.
  • the jet nozzles may be provided so as to avoid a case where jet nozzles of the jet nozzle rows exist together on a straight line along the transfer line and coolant may be jetted from each jet nozzle toward the wire rod.
  • a slit nozzle that jets coolant toward the wire rod may be provided separately from the jet nozzle and coolant may be jetted from the slit nozzle toward the wire rod.
  • the conveyor may be a roller conveyor, a part of the roller conveyor may be formed of a disc roller including a plurality of discs, the jet nozzle may be provided between the discs, and coolant may be jetted from each jet nozzle toward the wire rod.
  • the jet nozzle row may be provided between rollers of the roller conveyor, and coolant may be jetted from each jet nozzle toward the wire rod.
  • a slit nozzle that jets coolant toward the wire rod may be provided in, out of spaces between rollers of the roller conveyor, a space between rollers in which the jet nozzle row is not provided, and coolant may be jetted from the plurality of jet nozzles and the slit nozzle toward the wire rod.
  • Cooling taking into consideration both the sparseness and denseness and the temperature of a non-concentric ring-shaped wire rod being transferred can be performed, and uniform cooling in which the temperature unevenness of the entire wire rod is reduced can be performed. Consequently, the mechanical properties and the surface conditions provided by controlled cooling can be made more uniform than conventional ones, and additional heat treatment can be omitted that is occasionally performed in the next or subsequent process in order to solve the yield reduction due to defects of them and solve the defects.
  • FIG. 1 is a schematic plan view of a ring-shaped wire rod.
  • FIG. 2 is a schematic side view of a wire rod cooling apparatus according to an embodiment of the present invention.
  • FIG. 3 is a schematic plan view of a wire rod cooling apparatus according to an embodiment of the present invention.
  • FIG. 4 is a cross-sectional view taken along A-A in FIG. 3 .
  • FIG. 5 is an illustration diagram showing a manner of the ON/OFF control of each jet nozzle.
  • FIG. 6 is a schematic plan view showing an example of the case where a plurality of jet nozzle rows are provided.
  • FIG. 7 is a schematic plan view showing an example of the case where a plurality of jet nozzle rows are provided.
  • FIG. 8 is a schematic side view showing a nozzle configuration in the case where a plurality of jet nozzle rows are provided.
  • FIG. 9 is a schematic side view showing another nozzle configuration in the case where a plurality of jet nozzle rows are provided.
  • FIG. 10 is a schematic side view showing an arrangement example of thermo-cameras in the case where a plurality of jet nozzle rows are provided.
  • FIG. 11 is a schematic side view showing an arrangement example of thermo-cameras in the case where a plurality of jet nozzle rows are provided.
  • FIG. 12 is a schematic plan view in the case where the jet nozzle is provided between rollers.
  • FIG. 13 is a cross-sectional view taken along A-A in the case where each jet nozzle is provided with a flow regulating valve.
  • FIG. 14 shows an example of the control flow of the coolant jetted from the jet nozzle.
  • FIG. 15 is a graph of the amount of coolant with respect to the sparseness and denseness information and the temperature information.
  • a wire rod cooling apparatus 1 that cools a non-concentric ring-shaped wire rod M wound by a laying head 2 (a wire rod winder).
  • the speed of transfer of the ring-shaped wire rod M by a roller conveyor 3 provided on the exit side of the laying head 2 is constant.
  • compressed air is used as the coolant that cools the ring-shaped wire rod M.
  • Air sent by a fan is used as the coolant of the Stelmor cooling as conventional technology.
  • the wire rod cooling apparatus 1 includes a slit nozzle 4 between rollers 3 a of the roller conveyor 3 .
  • Each slit nozzle 4 is disposed such that the slit (not illustrated) at the tip of the nozzle faces up.
  • Each slit nozzle 4 is a nozzle in which an opening with a circular cross-sectional shape is formed on the upper surface of a hollow circular pipe, for example, and air at a constant flow rate is jetted from each slit nozzle 4 and the jetted air hits the ring-shaped wire rod M on the roller conveyor 3 ; thereby, the ring-shaped wire rod M is cooled.
  • the slit nozzle 4 is categorized into some types; there are a slit nozzle 4 a provided over the entire area in the width direction W between rollers 3 a and slit nozzles 4 b and 4 c provided in both end portions in the width direction W between rollers 3 a.
  • the lengths in the width direction of the slit nozzles 4 b and 4 c provided in both end portions in the width direction are different from each other.
  • the slit nozzle 4 a provided over the entire area in the width direction cools the dense-in-width-direction portion WD and the sparse-in-width-direction portion WS of the ring-shaped wire rod M uniformly, and the slit nozzles 4 b and 4 c provided in both end portions in the width direction W cool only the dense-in-width-direction portion WD of the ring-shaped wire rod M intensively.
  • rollers 3 a constituting the roller conveyer 3
  • one roller 3 a is formed by attaching a plurality of circular plate-like discs 5 to a rotating shaft 6 provided along the width direction W.
  • this roller 3 a may be referred to as a “disc roller 7 .”
  • a jet nozzle 8 that jets compressed air toward the ring-shaped wire rod M being transferred is provided between discs 5 and 5 of the disc roller 7 .
  • the jet nozzles 8 are arranged on a straight line along the width direction W (hereinafter, the row of the plurality of jet nozzles 8 arranged in the width direction W is referred to as a “jet nozzle row 9 ”).
  • Each jet nozzle 8 is connected to a header pipe 10 , and the header pipe 10 is connected to a compressor 12 via a compressed air supply path 11 .
  • Each jet nozzle 8 is provided with a shut-off valve 13 that shuts off the jetting of compressed air.
  • Each jet nozzle 8 may be a cut pipe, or may be one using a nozzle tip. To make it possible to cool a specified portion S of the ring-shaped wire rod M described later with reliability, each jet nozzle 8 is provided so that the spread of compressed air has a diameter of, for example, 5 mm to 20 mm, which is near the diameter of the wire rod, in the position where the jetted compressed air hits the wire rod. In other words, each jet nozzle 8 can control compressed air individually for each specified portion S.
  • thermo-camera 14 as an imaging device that images the ring-shaped wire rod M on the roller conveyor is provided on the transfer-line upstream side of the jet nozzle row 9 .
  • the thermo-camera 14 images the entire width and a prescribed range in the transfer direction T of the ring-shaped wire rod M.
  • the prescribed range refers to a range in which an image that allows the sparseness and denseness condition and the temperature condition of the ring-shaped wire rod M described later to be identified can be captured.
  • the thermo-camera 14 is installed at such a height as to be free from the adverse effects of the temperature of the ring-shaped wire rod M being transferred.
  • the wire rod cooling apparatus 1 includes a control unit 15 that controls the operation of the shut-off valve 13 of each jet nozzle 8 and the compressor 12 .
  • the control unit 15 has a function of, from the image of the ring-shaped wire rod captured by the thermo-camera 14 , identifying a portion where the temperature is high (a high temperature portion) and a portion where the temperature is low relative to the high temperature portion (a low temperature portion), and a portion where the wire rod is dense and a portion where the wire rod is sparse.
  • control unit 15 has a function of specifying a portion of the ring-shaped wire rod M where cooling is needed on the basis of the sparseness and denseness information and the temperature information of the ring-shaped wire rod M and selecting a jet nozzle 8 that can jet coolant toward the specified portion out of the jet nozzle row 9 .
  • the control unit 15 has also a function of calculating the timing when the specified portion S of the ring-shaped wire rod M passes above the selected jet nozzle 8 on the basis of the position of image capture, the position of the selected jet nozzle 8 , and the speed of the roller conveyor.
  • the wire rod cooling apparatus 1 is configured in the above manner. Next, a method for cooling the ring-shaped wire rod M using the wire rod cooling apparatus 1 is described.
  • the ring-shaped wire rod M wound by the laying head 2 is transferred while being cooled by the slit nozzle 4 between rollers 3 a.
  • An image of the ring-shaped wire rod M that has entered the imaging range A of the thermo-camera 14 is captured.
  • a portion where the temperature of the ring-shaped wire rod M is higher than the upper limit of the permissible temperature (the high temperature portion) and a portion where the temperature of the ring-shaped wire rod M is lower than the upper limit of the permissible temperature (the low temperature portion), and a portion where the wire rod M is dense (the dense portion) and a portion where the wire rod M is sparse (the sparse portion) are identified by the control unit 15 .
  • the control unit 15 On the basis of the sparseness and denseness information and the temperature information of the ring-shaped wire rod M, it is specified which portion of the ring-shaped wire rod M is to be cooled, in accordance with a prescribed determination criterion.
  • the determination criterion is that a portion that is the dense portion and at the same time the high temperature portion and a portion that is the sparse portion and yet the high temperature portion of the ring-shaped wire rod M are taken as the cooling object, and that a portion that is the dense portion and at the same time the low temperature portion and a portion that is the sparse portion and at the same time the low temperature portion are not taken as the cooling object.
  • the upper limit of the permissible temperature is determined as appropriate in accordance with the length and position of the transfer line, the installation position and cooling capacity of the slit nozzle 4 , the installation position and cooling capacity of the jet nozzle row 9 , etc.
  • the “dense portion” refers to a portion where two or more parts of the wire rod overlap and a portion where the distance between adjacent rings is short, for example.
  • the dense-in-width-direction portion WD of the ring-shaped wire rod M may not be the “dense portion” when the distance between rings is long; on the other hand, even the sparse-in-width-direction portion WS may be the “dense portion” when the distance between rings is short. That is, in the embodiment, the sparseness and denseness of the ring-shaped wire rod M are identified while not only the sparseness and denseness in the width direction W but also the sparseness and denseness in the transfer direction T are taken into consideration.
  • a jet nozzle 8 that can cool the portion specified as the cooling object (hereinafter, referred to as a “specified portion S”) is selected out of the jet nozzle row 9 . Subsequently, the timing when the specified portion S passes above the selected jet nozzle 8 is calculated on the basis of the position of image capture, the position of the selected jet nozzle 8 , and the transfer speed.
  • FIG. 5 is schematic plan views for describing the opening and closing operation of each jet nozzle 8 to the ring-shaped wire rod M; each jet nozzle 8 is actually located below the ring-shaped wire rod M as shown in FIG. 2 , but in FIG. 5 an illustration manner in which each jet nozzle 8 is located above the ring-shaped wire rod M is employed in order to enhance the visibility of the opening and closing state of the nozzle.
  • the specified portions S shown in FIG. 5 are the illustration of parts of the plurality of specified portions existing.
  • the ring-shaped wire rod M is further transferred to the downstream side of the transfer line, and the specified portion S of the ring-shaped wire rod M arrives at the jet nozzle row 9 .
  • the shut-off valves 13 ( FIG. 4 ) of jet nozzles 8 selected out of the jet nozzle row 9 are opened, and compressed air is jetted toward the specified portion S.
  • the jet nozzles 8 selected in FIG. 5( b ) are those in the positions corresponding to the dense-in-width-direction portion WD of the ring-shaped wire rod M, but some jet nozzles 8 a in the lower portion of FIG. 5( b ) are closed. These portions are portions where parts of the wire rod do not overlap and the ring pitch is wide, that is, the sparse portion. The cooling of these portions is performed by the slit nozzle 4 .
  • the ring-shaped wire rod M is further transferred to the downstream side of the transfer line, and with the change of the position of the specified portion S passing through the jet nozzle row 9 , the opening and closing state of each jet nozzle 8 is changed accordingly. Thereby, only the specified portion S passing through the jet nozzle row 9 is selectively cooled. Such opening and closing operation of the jet nozzle 8 is performed on the entire ring-shaped wire rod transferred; thus, the cooling of the ring-shaped wire rod M finishes.
  • the opening and closing of each jet nozzle 8 can be controlled on the basis of the sparseness and denseness information and the temperature information of the ring-shaped wire rod M obtained by the thermo-camera 14 .
  • the specified portion S of the ring-shaped wire rod M can be selectively cooled; thus, it is possible to cool only the portion where cooling is needed.
  • the jetting and shutoff of compressed air from the jet nozzle 8 can be controlled quickly, and the amount of coolant can be finely controlled in accordance with the quick change of the specified portion S.
  • the temperature unevenness of the entire wire rod can be reduced. Consequently, the quality of the entire wire rod can be made uniform, and eventually the costs spent to remove defective quality portions can be reduced and a reduction in sales due to the downgrading of the quality grade can be avoided.
  • the type of the coolant is not limited thereto.
  • a coolant in which gas and liquid are mixed together into a mist form may be jetted from each jet nozzle 8 .
  • a coolant cooled beforehand may be used. When either of these coolants is used, it is preferable that pressure be applied to the coolant in order to quickly control the jetting and shutoff of the jet nozzle 8 as mentioned above.
  • thermo-camera 14 is used as the imaging device that captures the image of the ring-shaped wire rod M
  • the imaging device is not limited thereto.
  • a video camera may be used.
  • the high temperature portion of the ring-shaped wire rod M is shown as a portion of high brightness in the image and on the other hand the low temperature portion is shown as a portion of low brightness in the image; therefore, the sparseness and denseness information and the temperature information of the ring-shaped wire rod M can be extracted.
  • the imaging device may be also a device that captures still images, not limited to a device that captures moving images.
  • the “image” in this specification includes moving images and still images.
  • each jet nozzle 8 is controlled on the basis of the sparseness and denseness information and the temperature information of the ring-shaped wire rod M, also the flow rate of coolant jetted from the slit nozzle 4 may be controlled, in addition to the control of each jet nozzle 8 .
  • each jet nozzle 8 is provided so that coolant is sprayed from below the ring-shaped wire rod M
  • the jet nozzle 8 may be provided so that coolant is sprayed from above the ring-shaped wire rod M.
  • the roller conveyor 3 is used as the conveyor that transfers the ring-shaped wire rod M
  • a chain conveyor may be used, for example.
  • the type of the conveyor is not particularly limited to the extent that each jet nozzle 8 can be provided so that coolant can be sprayed to the ring-shaped wire rod M.
  • the jet nozzles 8 are provided on a straight line along the width direction W of the roller conveyor 3 , they do not need to be provided strictly on a straight line to the extent that the jet nozzles 8 are provided along the width direction W so that the cooling of the portions in the width direction W of the ring-shaped wire rod M can be performed by sharing among the jet nozzles 8 .
  • the jet nozzles 8 are provided on a straight line, the control of the coolant jetting timing etc. of the jet nozzles 8 can be performed easily.
  • one jet nozzle row 9 is configured by forming one of the rollers 3 a constituting the roller conveyor 3 as the disc roller 7 and providing a plurality of jet nozzles 8 between discs 5 and 5
  • the number of jet nozzle rows 9 is not limited to one.
  • a plurality of jet nozzle rows 9 may be provided at certain intervals.
  • the jet nozzles 8 may be provided so as to avoid the case where jet nozzles of the jet nozzle rows 9 exist together on a straight line L along the transfer direction T, as shown in FIG. 7 .
  • a jet nozzle 8 of an upstream-side jet nozzle row 16 there is provided no jet nozzle 8 of a downstream-side jet nozzle row 17 .
  • the specified portion S can be cooled by a jet nozzle 8 of the downstream-side jet nozzle row 17 . That is, the uncoolable ranges in the jet nozzle rows 9 can be mutually covered, and therefore the specified portion S of the ring-shaped wire rod M can be cooled with reliability.
  • the header pipe 10 connected to the jet nozzle 8 may be provided for each jet nozzle row 9 to connect the header pipes 10 and the jet nozzles 8 together, as shown in FIG. 8 . It is also possible to connect branched portions of one header pipe 10 to the jet nozzles 8 of the jet nozzle rows 9 , as shown in FIG. 9 .
  • the number of imaging devices 14 that image the ring-shaped wire rod M may be the same as the number of jet nozzle rows 9 , or may be smaller than the number of jet nozzle rows 9 .
  • the imaging device 14 may be provided individually on the upstream side of each jet nozzle row 9 .
  • an image of the ring-shaped wire rod M cooled by the upstream-side jet nozzle row 16 (a first jet nozzle row) may be captured again by the downstream-side imaging device 14 , and thus the sparseness and denseness information and the temperature information of the ring-shaped wire rod M can be updated.
  • the ring-shaped wire rod M can be cooled by the downstream-side jet nozzle row 17 (a second jet nozzle row) on the basis of the sparseness and denseness information and the temperature information of the ring-shaped wire rod M updated.
  • the flow rate of coolant of each jet nozzle 8 on the basis of the updated information, the temperature unevenness of the entire wire rod can be reduced more.
  • the coolant jetting condition of each jet nozzle 8 can be controlled on the basis of the sparseness and denseness information and the temperature information of the ring-shaped wire rod M obtained from one imaging device 14 .
  • the coolant jetting condition of each jet nozzle 8 can be controlled on the basis of the sparseness and denseness information and the temperature information of the ring-shaped wire rod M obtained from one imaging device 14 . In the example shown in FIG.
  • the temperature condition at the time point when the ring-shaped wire rod M has arrived at the downstream-side jet nozzle row 17 is predicted on the basis of the sparseness and denseness information and the temperature information of the ring-shaped wire rod M obtained from the imaging device 14 , and each jet nozzle 8 of the downstream-side jet nozzle row 17 is controlled on the basis of the predicted temperature condition.
  • the jet nozzles 8 may be provided between rollers 3 a of the roller conveyor 3 , as shown in FIG. 12 .
  • the jet nozzles 8 By providing the jet nozzles 8 in place of the slit nozzle 4 like those provided in conventional wire rod cooling apparatuses, cooling in accordance with the sparseness and denseness condition and the temperature condition of the ring-shaped wire rod M can be performed. Thereby, the temperature unevenness of the entire wire rod can be reduced.
  • the number of jet nozzle rows 9 provided between rollers 3 a is increased, the temperature unevenness of the entire wire rod can be reduced more. It is possible to provide the jet nozzle 8 in place of all the slit nozzles 4 , but when the jet nozzle 8 is provided in combination with a conventional wire rod cooling apparatus, the costs of plant and equipment investment etc. can be suppressed.
  • each jet nozzle 8 is provided with the shut-off valve 13 to on/off-control the coolant jetting of each jet nozzle 8
  • each jet nozzle 8 may be provided with a flow regulating valve 18 to control the flow rate of coolant jetted from each jet nozzle 8 , as shown in FIG. 13 . That is, the specified portion S of the ring-shaped wire rod M can be selectively cooled by controlling the flow rate of each jet nozzle 8 on the basis of the sparseness and denseness information and the temperature information of the ring-shaped wire rod M obtained by the thermo-camera 14 .
  • a pressure gauge (not illustrated) and a speed indicator (not illustrated) may be provided on the downstream side of the flow regulating valve 18 .
  • the flow rate of coolant can be calculated from the pressure-flow rate characteristics of each jet nozzle 8 or the relationship between the cross-sectional area of the nozzle and the flow velocity.
  • control may be made so as to adjust the degree of opening of the flow regulating valve 18 .
  • a means for measuring the temperature of coolant may be provided to control the flow rate of coolant in accordance with the temperature of coolant.
  • the method for controlling coolant from the jet nozzle 8 is not limited to the above embodiment, and various control methods may be used to the extent that they are control based on the sparseness and denseness information and the temperature information of the ring-shaped wire rod M.
  • FIG. 14 shows an example of the control flow of the coolant from the jet nozzle 8 .
  • step S 1 of FIG. 14 an image of the ring-shaped wire rod M that has entered the imaging range A of the thermo-camera 14 is captured (step S 1 of FIG. 14 ).
  • the captured image is outputted to the control unit 15 , and the sparseness and denseness information D and the temperature information T of the ring-shaped wire rod M are obtained in the control unit 15 (step S 2 of FIG. 14 ).
  • steps S 1 and S 2 are similar to the above embodiment, and a detailed description is omitted.
  • a sparseness and denseness standard Ds and a temperature standard Ts serving as the standard of the amount of coolant are set beforehand (step S 3 of FIG. 14 ).
  • the sparseness and denseness standard Ds and the temperature standard Ts are set on the basis of the quality (strength), thickness, alloy components, transfer speed, etc. of the ring-shaped wire rod M, for example.
  • the flow rate of coolant jetted from the jet nozzle 8 is calculated on the basis of the sparseness and denseness information D and the temperature information T obtained in step S 2 and the sparseness and denseness standard Ds and the temperature standard Is obtained in step S 3 .
  • a specific method for calculating the flow rate of coolant is described later.
  • a jet nozzle 8 that can cool the specified portion S is selected out of the jet nozzle row 9 , and the timing of jetting coolant from the jet nozzle 8 is calculated on the basis of the position of image capture, the position of the selected jet nozzle 8 , and the transfer speed (step S 4 of FIG. 14 ).
  • the method for calculating the amount of coolant in this step S 4 may have variations.
  • the sparseness and denseness information D and the temperature information T obtained in step S 2 may be corrected on the basis of the sparseness and denseness standard Ds and the temperature standard Ts obtained in step S 3 , and the amount of coolant may be calculated using linear programming.
  • a graph of the amount of coolant with respect to the sparseness and denseness information D and the temperature information T is found beforehand. Then, the sparseness and denseness information D and the temperature information T after correction are applied to the graph; thus, the amount of coolant is derived.
  • the amount of coolant in FIG. 15 may be the flow rate of coolant jetted from each jet nozzle 8 , or may be the number of jet nozzle rows 9 in the case where a plurality of jet nozzle rows 9 are provided, for example.
  • the amount of coolant may be derived by directly applying the sparseness and denseness information D and the temperature information T obtained in step S 2 to the graph.
  • shut-off valve 13 and the flow regulating valve 18 are controlled on the basis of the amount of coolant and the jetting timing calculated in step S 4 , and coolant at an appropriate flow rate is jetted from the jet nozzle 8 to the specified portion S at an appropriate timing.
  • the cooling of the ring-shaped wire rod M is performed.
  • the flow rate of coolant is controlled on the basis of both the sparseness and denseness information D and the temperature information T of the ring-shaped wire rod M, the flow rate of coolant can be controlled appropriately even for portions where the ring-shaped wire rod M is sparse and yet the temperature is high and portions where the ring-shaped wire rod M is dense and yet the temperature is low, for which appropriate control has so far been unable to be made, not to mention portions where the ring-shaped wire rod M is dense and the temperature is high and portions where the ring-shaped wire rod M is sparse and the temperature is low.
  • the specified portion of the ring-shaped wire rod M can be selectively cooled, and the amount of coolant can be finely controlled in accordance with the quick change of the specified portion S.
  • coolant can be jetted appropriately even to a portion where the cooling rate is locally low, such as a portion where parts of the ring-shaped wire rod M overlap or a portion where parts of the ring-shaped wire rod M are stuck together, that is, a portion where the strength may be reduced locally. Consequently, the temperature unevenness of the entire wire rod can be reduced, and the quality of the entire wire rod can be made uniform.
  • the present invention can be applied to the cooling of a wire rod wound by a laying head.
  • thermo-camera (imaging device)

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
US15/021,553 2013-10-29 2014-08-04 Wire rod cooling device and wire rod cooling method Abandoned US20160230246A1 (en)

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JP2013-224279 2013-10-29
JP2013224279 2013-10-29
PCT/JP2014/070474 WO2015064167A1 (ja) 2013-10-29 2014-08-04 線材冷却装置及び線材冷却方法

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CN110496863A (zh) * 2018-05-17 2019-11-26 宝山钢铁股份有限公司 一种轧件运输辊道冷却控制***及其方法
CN112916628B (zh) * 2021-04-20 2023-01-24 中天钢铁集团有限公司 斯太尔摩辊道及其弹簧钢热轧盘条的高速线材生产方法
CN114289528B (zh) * 2021-11-24 2023-06-16 新兴铸管股份有限公司 高线风冷辊道
CN114653762B (zh) * 2022-05-10 2023-06-06 新余钢铁股份有限公司 高速线材头部水冷控冷方法及控冷***

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CN105658348A (zh) 2016-06-08
CN105658348B (zh) 2019-06-21
EP3037185A4 (en) 2017-04-19
KR101782757B1 (ko) 2017-09-27
EP3037185B1 (en) 2019-10-02
EP3037185A1 (en) 2016-06-29

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