EP0614992A1 - Kühlungsvorrichtung und -verfahren für metallband - Google Patents

Kühlungsvorrichtung und -verfahren für metallband Download PDF

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Publication number
EP0614992A1
EP0614992A1 EP93913561A EP93913561A EP0614992A1 EP 0614992 A1 EP0614992 A1 EP 0614992A1 EP 93913561 A EP93913561 A EP 93913561A EP 93913561 A EP93913561 A EP 93913561A EP 0614992 A1 EP0614992 A1 EP 0614992A1
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EP
European Patent Office
Prior art keywords
strip
cooling
equipment
nozzle
width
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93913561A
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English (en)
French (fr)
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EP0614992A4 (en
EP0614992B1 (de
Inventor
Naoto Kitagawa
Sugao Omori
Takaya Seike
Koji Ohmori
Masayuki Yamazaki
Hiroaki Sato
Hitoshi Oishi
Masafumi Suzuki
Osamu Yoshioka
Yasuhiro Araki
Hiroshi Sawada
Kazunori Hashimoto
Hideo Kobayashi
Shuzo Uchino
Hideki Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP5112488A external-priority patent/JPH06306485A/ja
Priority claimed from JP5152634A external-priority patent/JPH06340913A/ja
Priority claimed from JP5152636A external-priority patent/JPH06340928A/ja
Priority claimed from JP15263593A external-priority patent/JP3191495B2/ja
Priority claimed from JP5156361A external-priority patent/JP2979902B2/ja
Priority claimed from JP5156362A external-priority patent/JP2979903B2/ja
Priority claimed from JP5173682A external-priority patent/JP2979908B2/ja
Priority claimed from JP5173683A external-priority patent/JP2906927B2/ja
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority claimed from JP5173684A external-priority patent/JPH0711346A/ja
Publication of EP0614992A1 publication Critical patent/EP0614992A1/de
Publication of EP0614992A4 publication Critical patent/EP0614992A4/en
Publication of EP0614992B1 publication Critical patent/EP0614992B1/de
Application granted granted Critical
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Expired - Lifetime 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
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • 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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/613—Gases; Liquefied or solidified normally gaseous material
    • 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
    • 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
    • C21D9/5735—Details
    • C21D9/5737—Rolls; Drums; Roll arrangements

Definitions

  • the present invention relates to an equipment and a method for cooling metal strips in a heat treating line.
  • Japanese Patent Laid Open No.60-169524 discloses an equipment of wrapping a metal strip X on a plurality of cooling rolls #1 to #4 for cooling the strip at its contacting faces thereof, composed of gas jetting equipment ⁇ 1 to ⁇ 4, gas flow control valves 84a to 84e, thermometers 90a to 90d, and strip temperature control systems 87a to 87d, said gas jetting equipment ⁇ 1 to ⁇ 4 opposite to the cooling rolls #1 to #4 being, as seen in Fig.
  • thermometers 90a to 90d shown in the same being for detecting the temperature distributions in the width of the metal strip X and for calculating the strip temperature difference at respective points in the strip width with respect to an average temperature in the strip width, and when said difference exceeds an allowance limit, such a position in the strip width is detected, and said strip temperature control systems 87a to 87d being for adjusting the gas flowing control valves 84a to 84e in response to said detected position.
  • a positive deviation of the strip temperature occurs within a certain range of the strip width with respect to the average temperature in the strip width, irrespective of the sizes of the metal strips and the cooling conditions in the center part thereof.
  • the non-contacting length L between the cooling roll and the metal strip at both edges wrapping on the cooling roll as well as the strip displacement Z at both edges are expressed by the under mentioned formulae 11 and 12.
  • the non-contacting length L is about 15 mm and the strip displacement Z is about 0.1 mm.
  • the present invention has been provided to solve the above mentioned problems, and is to propose an equipment for cooling the metal strips and a method therefor, by which rapid cooling can be performed while uniformalizing the temperature in the strip width at economical operation costs with respect to large sizes to be cooled.
  • the cooling equipment of the metal strip according to the present invention is a roll quenching equipment which wraps the metal strip on at least one cooling roll, and adjusts a wrapping length between the metal strip and each of the cooling rolls, fundametally characterized by providing gas jet cooling equipment where two or more nozzle headers are disposed in the roll axis to the cooling rolls via the metal strip, said nozzle headers being narrower than the metal strip, and the nozzle headers are movable along the moving direction of the cooling rolls, and at least one of said nozzle headers is movable along the roll axis; and gas adjusting devices for adjusting the pressure or the flow rate of the cooling gas flowed into each nozzle header (the structure of which corresponds to structures of pressure control valves, gas supply blowers or a calculation device for strip temperature control which adjusts opening of pressure control valves and rotating speed of gas supply blowers as later said).
  • a hot point of the W-shaped non-uniform temperature distribution is small in width as stated above, and if a plurality of nozzles were provided in the width of the metal strip as seen in conventional structures and if there were the hot points in portions corresponding to partition walls, the coolings thereat would be difficult, and if the cooling were forcibly carried out, the portion around the hot point would be over-cooled.
  • the nozzle header of the narrow width is moved just above the hot point, and the cooling gas whose pressure or flow rate have been adjusted by the gas control device is impinged on said hot points, thereby to carry out spot coolings thereon, so that non-uniform temperature distribution is effeciently solved.
  • the nozzle headers are made movable in the moving directions of the cooling roll, because the cooling roll is movable in a transverse direction with a strip passing line, in order that the cooling roll may change the wrapping length with the strip, it is necessary that the nozzle header may always take an optimum nozzle height for cooling the strip wrapping on the cooling roll (in this case, the nozzle header moves in the same direction as moving of the cooling roll), and the header does not contact the metal strip (when the cooling roll separates from the strip passing line and just before this separation, the nozzle header reversely moves to the direction of a retract position, and further when the cooling roll is going to contact the passing line, the nozzle header moves in a reverse direction as it approaches the cooling roll from the retract or rest position).
  • the nozzle mouths 11 are, as seen in Fig.44 (a) to (d), shaped in R in the inside of the cross section thereof, tapered, or projected outwardly as (c) and (d) of the same.
  • each of them is positioned at the strip edges in the width thereof, and in case the nozzle headers are three, one of them is positioned almost at the center in the strip width (the nozzle header at the center is not moved along the roll axis but may be fixed there), and when the remaining two are positioned at the strip edges, this arrangement is effective to eliminating of the W shaped non-uniform distribution of the strip temperature (said non-uniform temperature distribution is in general higher at both edges than the center, and therefore the nozzle headers at both edges are preferentially moved).
  • the present invention can be applied not only to the structure having one cooling roll, but to structures having two or more cooling rolls.
  • the three nozzle headers are arranged to at least first cooling roll to build the above mentioned structures.
  • these cooling rolls divided into an entry side and a delivery side and with respect to the cooling rolls of the entry side the three nozzle headers are installed to provide the above mentioned header arrangement, while with respect to the cooling rolls of delivery section, the two nozzle headers are installed to provide the arrangement of the two nozzle headers.
  • nozzle headers are three installed to the first cooling roll or the cooling rolls in entry side, so that the center portion of the metal strip swells when the cooling roll begins to contact, so that the non-uniform temperature distribution is caused [as seen in Fig.45(a), the body part of the roll #1 on which the strip X does not contact due to the bad shaping of the strip, is more cooled by a coolant within the cooling roll than the contacting part, and even if the shaping is improved, the center part thereof is not cooled as in Fig.45(b) and is more elongated than both edges and resulted as in Fig.45(c). This phenomenon is called as a center swelling.
  • the nozzle header is also disposed for the center part of at least the first cooling roll or the cooling rolls of entry section, so that the spot thereon and the gas jetting at the edge of wrapping strip around the cooling roll are carried out, thereby enabling to solve the problem of the center swelling (this is especially effective by means of the first roll, even if the material has a large thickness).
  • the structure is composed of the three nozzle headers including the center nozzle header with respect to the first cooling roll or the cooling rolls of entry section, it is sufficient to install the nozzle headers respectively for both strip edges in the following cooling rolls.
  • the cooling amount should be increased as much as possible at an upstream side where said deformation is generated, and aiming at early cancelling the bad shapings of the strip around a part where the strip and the cooling roll begin to contact, the cooling amount should be made as much as possible also for the rear surface of the strip wrapped around the roll in the entry section, (as to others, a thermal load is very low, and even the rolls of the entry section sometimes carry out the coolings under a condition that said rolls do not have a full shift stroke thereof).
  • the structure allows the nozzle headers of the entry section to follow the moving of the cooling rolls such that the distances of the nozzle headers from the respective cooling rolls are maintained constant, thereby to heighten the cooling effect in the entry section. More specifically, the nozzle header is moved from the retracting position in a direction approaching the strip at the same time as beginning to contact between the strip in the pass line and the cooling roll. Further, when the shift stroke of the roll is longer than at the time of said contacting, the nozzle header is moved for maintaining the distance from the strip constant. When the strip and the cooling roll are non-contacted, the nozzle headers will be moved to the retract position. In contrast, the nozzle headers of the delivery section do not always require said requirements and may be stationary.
  • the nozzle headers should be retractable, because, if nozzle headers are designed such that when the cooling rolls make the maximum shift stroke, the length of the nozzle header opposite thereto is maximum, e.g., one cooling roll cannot be used, whereby the shift stroke of the cooling roll before or after said cooling roll is short, so that the nozzle header following the cooling roll whose shift stroke is short, or the nozzle header fixed to the rear side of the strip wrapped around the cooling rolls, contact the strip.
  • the nozzle header of delivery section is ordinarily set to be, at cooling, moved to determined positions and to be positioned at the retract position only in an emergency or at time of not cooling, so as not to absolutely follow the moving of the cooling rolls.
  • the nozzle header is moved in the direction toward the strip from the retract position at the same time as beginning to contact between the strip in the passing line and the cooling roll, and thereafter although the shift stroke of the cooling rolls becomes long, the nozzle header does not move to a determined position, and the nozzle headers are again retreated to the retract position just before the metal strip and the cooling roll become non-contacting.
  • the cooling rate should be made as large as possible in the upstream side from which the deformation is derived, and the cooling on the rear side of the strip wrapped around the roll where the uniform cooling can be made in the strip width should be mainly made in the upstream side. Therefore, not only the cooling length is made large (the shift stroke of the roll is made large) by successively pushing the cooling rolls from the upstream side in the entry section, in particular in preference of the first cooling roll, but also he gas jet jet flow is made maximum in succession from the nozzle headers of the upstream side for carrying out the cooling, and the lacked cooling is compensated in the downstream side.
  • the nozzle header for cooling the rear of the strip wrapped around the cooling roll largely separates from the metal strip in the downstream side (even if the roll is non-contacted, said rear can be cooling by said nozzle header). For saving energy at this time, if a distance between the nozzle header and the cooling roll is larger than a certain distance, a shut-off value of a gas supplying channel furnished in each nozzle header is closed.
  • the moving amounts thereof in the moving direction of the cooling rolls can be made different respectively, and the distance between each nozzle header and the cooling roll can be made different in the roll axis.
  • Such a structure can be applied for correcting it, if a required cooling rate in the transverse direction is varied in the roll length.
  • the cooling rate has still surplus power, the uses of facilities such as the gas blowers and others can be reduced, resulting being useful to saving the energy.
  • the present structure combines a plurality of the header bodies in the roll axis, and when the strip widths change, the structure heightens the pressure or the flow rate of the cooling gas of the header bodies near the strip edges, thereby to compensate delay in moving of the nozzle header (the low response).
  • the inside header bodies ⁇ c, ⁇ e or ⁇ c, ⁇ e corresponding to both edges as well as the center header bodies ⁇ b, ⁇ f or ⁇ b, ⁇ f are used as seen in Fig.46(a).
  • the outside header bodies ⁇ a, ⁇ g or ⁇ a, ⁇ g corresponding to both edges as well as the center header bodies ⁇ b, ⁇ f or ⁇ b, ⁇ f are used as seen in Fig.46(b), whereby the length of the strip which has the temperature deviation in the transverse direction can be made shortest, thereby enabling to avoid rollings of the metal strip running in the heat treating furnace after the cooling apparatus.
  • the nozzle header 1 is structured in that the connected header bodies 10 are further plurally stepped along the running direction of the metal strip, and the nozzle mouths 11 of the header bodies 10 may be off along the roll axis with respect to the upstream and the down-stream sides, whereby the position to be a partition wall in a one step is a position for installing the nozzle mouth 11 in the upper or lower step, so that said problem is solved.
  • the positions of the nozzle mouths 11 of the connected header bodies 10 are deviated toward the neigbour header bodies 10 in the strip running direction, so that both neighbour nozzle mouths 11 are differently positioned and the above problem is solved (as to other, the same effect is brought about in a structure which has a plurality of the nozzle mouths in the roll axis within one nozzle header and deviates the neighbour nozzle mouths in the strip running direction).
  • the tension of the metal strip is varied to be higher before the above cooling roll contacts the metal strip, thereby to stabilize the shape of the strip when contacting.
  • the header bodies are divided into not less than two ( ⁇ a1, ⁇ a2, ⁇ c1, ⁇ c2, ⁇ a1, ⁇ a2, ⁇ c1, ⁇ c2) in the traveling direction of the strip, and are independently movable along the roll axis (or the strip width) for the nozzle headers ⁇ a, ⁇ c, ⁇ a, ⁇ c to be positioned at least at both strip edges provided to the gas jet cooling equipment for cooling the rear side of the strip wrapping around the cooling roll and/or later mentioned auxiliary gas jet cooling equipment at the outlet of the cooling rolls.
  • Fig.50 (a) (b) (c) and Fig.51 (a) (b) (c)
  • the nozzle headers ( ⁇ a1, ⁇ c1, ⁇ a1, ⁇ c1) for the strip edges in the upstream side have previously been moved to sides to be strip edges after changing, and the nozzle heades ( ⁇ a2, ⁇ c2, ⁇ a2, ⁇ c2) for the strip edges in the downstream are also moved to the strip edges after changing, just before the parts of the different strip width come to these nozzle headers
  • Fig. 50 shows the movements of the headers of the strip edges when the wide width change to the narrow width
  • Fig. 51 shows the movements of the headers in a reverse case).
  • the above structure may be installed not only as the gas jet cooling equipment and the auxiliary gas jet cooling equipment, but as an auxiliary cooling equipment to be disposed at the inlet of the roll quenching equipment.
  • a target nozzle position calculation device for strip width change (a device which trucks, at the inlet of the cooling rolls, an information concerning connections such as weldings from the changing order, the width of the metal strip or the length up to the next weld point, and calculates the time reaching to the cooling roll, and outputs a new set position of the nozzle header in the roll axis), a strip edge position detector (a photo source and a detector, a laser source and a detector, and a later mentioned strip temperature profile measuring equipment (a profile thermometer) discriminating by difference in temperature between a high temperature part of the strip and an ambient low temperature part other than the strip, or a structure incorporated therewith), and a strip temperature profile measuring equipment are disposed at the inlet of the cooling rolls for obtaining an information of the width-changing weld point and the width-changing amount in accordance with the information therefrom, thereby enabling to set the nozzle headers for the edges in the strip width.
  • a target nozzle position calculation device for strip width change a device which trucks, at the in
  • the nozzle header has previously been moved to the predetermined position, and it is advantageous that when the strip has changed to the wide width, the contact between the strip and the roll is made satisfactory by cooling the rear side of the strip wrapped around the cooling roll. If the strip rolls, the nozzle headers follow the rolling.
  • the nozzle headers at both strip edges comprise the plurality of the header bodies connected in the roll axis (in the direction of the strip width), or when the header bodies of the edge nozzle headers are separated into two or more in the strip running direction and independently movable, abnormal parts by cooling in the width changing part can be more reduced and the nozzle width can be made more narrow, so that the over-coolings in the environments can be lowered.
  • this auxiliary gas jet cooling equipment when this auxiliary gas jet cooling equipment is disposed, it is allowed that at least such nozzle headers positioned at both strip edges among the nozzle headers thereof are composed of the plural header bodies connected in the strip width as a structure for compensating the delay in the moving of the nozzle headers when the strip width changes, and at least one of said nozzle headers is movable along the strip width, or the nozzle headers positioned at both strip edges are, as seen in Fig.49, divided into two or more in the strip traveling direction and are independently movable along the strip width.
  • the target nozzle position calculation device for the strip width change If disposing, at the inlet of the cooling rolls, one or more of the target nozzle position calculation device for the strip width change, the strip edge position detector, and the strip temperature profile measuring equipment so as to obtain an information of the width-changing weld point and the width-changing amount in accordance with the information therefrom, thereby to set the two nozzle headers for the strip edges of the gas jet cooling equipment and of the auxiliary gas jet cooling equipment, it is thus possible to move each of the nozzle headers to the predetermined positions before or after coming of the weld point of the strips being different in the widths.
  • each nozzle header of the gas jet cooling equipment and/or each nozzle header of the auxiliary gas jet cooling equipment are respectively set at the strip edges.
  • the above feed back control may be also performed by adjusting the pressure or the flow rate of the cooling gas jetted from the nozzle headers of the gas jet cooling equipment and/or these of the auxiliary gas jet cooling equipment in accordance with the information of the strip temperature at the outlets with or without accompanying the moving control of the nozzle headers.
  • the actual structure of the gas jet cooling equipment may employ the two or more nozzle headers having the narrower width than the strip width provided with the gas jetting nozzles, and moving beds for moving said nozzle headers in the direction toward the strip surface and/or in the direction of the strip width.
  • the temperature distribution is controlled in the strip width.
  • the distribution is uniformalized thereby in the strip width, and by this uniformalization, the cooling rate can be made uniform and the temperature uniformalized in the strip width can be brought to an objective temperature, so that problems about bad properties or form errors of the material can be solved.
  • the above structure may be of course applied to cooling of the rear side of the strip wrapped around the roll on at least one roll whose interior has been cooled (preferably the nozzle header is curved to meet the curvature of the roll), and may be used as the auxiliary gas jet cooling equipment to be installed at the inlet of the roll quenching equipment or at the outlet thereof.
  • the inlet there is the saddle shaped deformation caused by lacking of the cooling at the strip edges, and if the strip edges are in advance cooled by the gas cooling prior to the roll quenching, the saddle shaped deformation can be made small and the non-distribution of the strip temperature in the roll quenching equipment can be improved.
  • the nozzle header herein is plain; and as to the outlet, the plain nozzle header is chiefly used.
  • the above structure can be used to cooling system (points shown with A and B) before and/or after the roll quenchcing equipment, reaching a recrystallizing temperature to an over-aging treatment in a continuously annealing heat cycle of a soft and thin steel (for deep drawing) as seen in Fig.52.
  • the present structure can be applied, irrespective of the horizontal passing line or the vertical one.
  • this structure can be provided with respect to both of front and rear sides of the strip other than providing the nozzle headers and the moving beds for the one side of the strip.
  • the hot point (including parts which must be hot points) is cooled on both sides, thereby enabling to heighten the cooling effeciency and check flutterings of the strip.
  • the headers are transferred by the moving beds to both edges increasing the temperature, and when being three, the remaining one is brought to nearly the strip center of high temperature, or depending upon cases, to an appropriate position toward the strip surface for cooling the hot point by the nozzle headers.
  • the center header may fixed not to move (the nozzle header may be allowed to move in the transverse direction).
  • the nozzle header is made set to the moving of the cooling roll (when the roll and the header are integral and always move together, a problem occurs other than that the roll is retreated. That is, when the roll is retreated from the pass line at standing of the line, the header often contacts the strip at its edges.
  • the nozzle header is made set to the moving of the cooling roll in the range not contacting the strip, though the header follows the moving of the roll) within a range not contacting the strip on the pass line (in particular, when a (curved) size of the nozzle header in the back yard is determined in response to meeting a case that the shift stroke of the following roll in the back yard is maximum, the nozzle header should be retreated at emergency such as lowering the cooling load, and depending upon the positions of the cooling roll and if the nozzle header is left as the maximum pushing, it will contact the strip), or the nozzle header is moved independently of said moving of the cooling roll (as to the independent moving, other than said avoiding of the contact, fine adjustments are practicable for carrying out high cooling effeciency with the minimum gas amount, maintaining the optimum nozzle height of the highest cooling efficiency).
  • the present structure When the present structure is applied as an auxiliary cooling structure installed at the inlet of the roll quenching equipment as said above, it is sufficient to remove the non-uniform distribution of the temperature along the strip width before the roll quenching, or to cool the part to be the hot point by the roll quenching so as to bring to the uniform temperature distribution as nearly as possible (when carrying out the roll quenching, the non-uniform distribution is easily created or accelerated due to the relation between the saddle deformation of the metal strip and the heat crown of the roll).
  • the present structure When the present structure is disposed as the auxiliary gas jet cooling equipment at the outlet of the roll quenching equipment, it is also useful to cancel the non-uniform temperature distribution created and accelerated in the roll quenching, or not having been dismissed by means of this cooling equipment.
  • the nozzle headers 1 are arranged by slightly deviating in a running direction of the metal strip X, not arranging in a one row, so that the non-uniform part can be cooled by jetting the gas even if the non-uniform width is wider than the width of the nozzle header 1 as shown in Fig.53.
  • the auxiliary gas jet cooling equipment is provided, on the passing line of the metal strip, with carts moving in parallel to the strip surface and in the direction transverse with the strip passing line, the nozzle headers in the direction of the passing line which have the nozzles narrower than the strip width, a mechanism for traveling said cart, and flexible parts or the expansion joints on the part of the gas supplying channel.
  • the non-uniform temperature distribution can be also cancelled by jetting the cooling gas to the strip, following moving the nozzle header mounted on the cart to the area of the non-uniform distribution of the strip temperature (if the one is insufficient, the nozzle headers may be increased as two, three... in the strip width).
  • the distribution is uniformalized thereby in the strip width, and by this uniformalization, the cooling rate is made uniform and the temperature uniformalized in the strip width is brought to an objective temperature, so that problems about bad properties or form errors of the mateiral are solved.
  • the above structure may be also used as the auxiliary cooling system for cooling the strip edges and/or hot points at the inlet of the roll quenching equipment (the saddle shaped deformation can be reduced in that the strip edges have previously been cooled by the gas - cooling prior to the roll quenching and the non-uniform distribution of the strip temperature caused by the roll quenching can be improved).
  • the above structure can be used to the gas jet cooling systems before and/or after the roll quenching equipment reaching from a recrystallizing temperature to an over-aging treatment in a continuous annealing heat cycle of a soft and thin steel (for deep drawing) as seen in Fig.52.
  • the present structure is applicable, irrespective of the horizontal or vertical passing lines.
  • the nozzle headers are transferred by the carts to both edges increasing the temperature, and when being three, one is brought to nearly the strip center of high temperature to cool the hot point by the nozzle headers.
  • the present invention proposes such a cooling equipment of the metal strips, which wraps the strip around at least one cooling roll, and individually adjusts the wrapping lengths between the strip and the cooling rolls, providing gas jet cooling equipment comprising three or more nozzle headers in the roll axis opposite said cooling rolls where said nozzle headers are movable along the moving directions of the cooling rolls, and at least one nozzle header is movable along the axis of the roll, strip edge position detectors, position adjustment devices which adjust movements of the movable nozzle headers among said nozzle headers along the roll axis, a calculation devices for nozzle header position control which controls said position adjustment devices in accordance with detected signals of said detectors, position adjustment devices which adjust positions of said nozzle headers with positional signals of the cooling rolls along the moving directions of the cooling roll, strip temperature profile measuring equipment which detects the temperature distribution in the strip width at the outlet of the cooling roll, and a calculation device for strip temperature control which calculates the deviation in temperature with respect to the objective distribution of the strip temperature with the temperature signal put out from said measuring
  • the nozzle header is transferred in the roll axis in that said calculation device for nozzle header position control is based on data detected by said strip edge position detector, because a high position of the strip temperature distribution is almost determined in the strip width. But if a measuring equipment of the profile of the strip temperature is used to said strip edge position detector, the high position of the strip temperature distribution may be rendered to be moving positions of the nozzle header as the strip edges.
  • the non-uniform distribution of the strip temperature is cancelled by the feed back control of the calculation device for strip temperature control which has been input with the detecting data of the strip temperature profile measuring equipment installed at the outlet of the cooling rolls or the outlet of the auxiliary gas jet cooling equipment.
  • a method of cancelling the non-uniform distribution is practised by adjusting the pressure or the flow rate of the cooling gas flowed into each nozzle header in response to the temperature deviation to the objective distribution of the strip temperature.
  • the objective distribution of the strip temperature a pre-set one may be used. But, for example, the average temperatures (+ ⁇ will occur according to cases) of two quarter parts in the strip width may be objective temperatures at the strip center, and the measured temperature at the strip center (this temperature is sometimes 0°C to 20°C lower than the temperature according to cases) may be made objective temperature at both edges of the strip.
  • the above structure may incorporate the auxiliary gas jet cooling equipment (including such a structure where at least the two nozzle headers, in particular each nozzle header at the edge, are movable in the strip width) together with the strip temperature profile measuring equipment.
  • the length of the part of the strip temperature deviation caused in both strip edges with respect to the average temperature in the strip width is relatively short as obtained in the formula 11.
  • the average strip temperature deviation ⁇ T of the strip edges defined in the formula 13 is largely varied as shown in Fig. 54 in response to the cooling width and strip thickness.
  • the strip temperature deviation can be reduced to minimum by detecting both strip edges by means of said detector, and moving the nozzle headers at both edges along the roll axis (or the strip width) to the proper cooling width by means of the position adjustment device.
  • the length of the strip temperature deviation caused in the strip center with respect to the average temperature in the strip width is within the range shown in Fig.57.
  • the nozzle widths Bc of each center nozzle header of the gas jet cooling equipment and that of the auxiliary gas jet cooling equipment can control the strip temperature deviation to be minimum by selecting results obtained by the formula 3, thereby to minimize the strip temperature distribution, said gas jet cooling equipment being opposite the cooling roll, and said auxiliary gas jet cooling equipment being disposed at the outlet of the cooling roll group.
  • Fig.58 shows a comparison between the prior art and the invention concerning an investment cost/a running cost.
  • the investment cost/the running cost can be saved by cutting back the amount of the gas and the rotating speed of the valves as shown in the same.
  • the above structure has three or more nozzle headers along the roll axis, and at least such nozzle headers thereamong, positioned at both strip edges comprise a plurality of the header bodies connected in the roll axis, so that said nozzle headers are movable along the roll axis, and the gas jet cooling equipment may be composed of these nozzle headers.
  • the calculation device for the nozzle header position control moves the nozzle header alone, the roll axis in accordance with data which has been detected by the strip edge position detector.
  • the connected nozzle headers can cover the delaying by increasing the pressure or the flow rate of the cooling gas in the header bodies near both strip edges.
  • the non-uniform distribution of the strip temperature is cancelled by the feed back control of the calculation device for strip temperature control which has been input with the detecting data of the strip temperature profile measuring equipment installed at the outlet of the cooling roll.
  • the method of cancelling the non-uniform distribution is practised by adjusting the pressure or the flow rate of the cooling gas flowed into each nozzle header in response to the temperature deviation to the objective distribution of the strip temperature.
  • nozzle headers of the auxiliary gas jet cooling equipment With respect to the nozzle headers of the auxiliary gas jet cooling equipment, at least such nozzle headers thereamong, positioned at both strip edges comprise the plurality of the header bodies connected in the strip width and are movable along the strip width for the same reason why the same structure is provided to the nozzle header of the gas jet cooling equipment.
  • the range of the strip temperature deviation caused in the strip center with respect to the average temperature in the strip width is within the limits as shown in Fig.57. If the pressure or the flow rate of the cooling gas flowed into the nozzle header is adjusted in response to the strip temperature deviation, the deviation caused at the center of the strip width as said above can be reduced to the minimum by selecting the results obtained by the above formula 3 with respect to the width Bc of the header body of each nozzle header installed at the centers of the gas jet cooling equipment opposite the cooling rolls and the auxiliary gas jet cooling equipment at the outlet of the cooling rolls.
  • the deviation caused in both strip edges can be reduced to the minimum in that the widths Be of the header bodies select a size shown in the under formula 17, the widths Beo of the nozzle headers at the outsides select the size shown in the formula 4, the widths Bec of the center header bodies select the sizes shown in the formulae 5 and 6 (if the strip thickness is not fixed and varied in the range of 1.0 mm to 2.0 mm, the nozzle width Bec is determined in accordance with the maximum thickness) and the widths Bei of the header bodies at the insides select the sizes shown in the formula 7. [ 4] Beo ⁇ Wu /2
  • the width Beo of the header body positioned at the outside of the nozzle headers of both edges and the width Bei of the header body positioned at the inside of the nozzle headers of the same determine the cooling widths thereof for covering the delays in moving of the nozzle headers at both strip edges when the widths change, and each of them is determined to be 1/2 of the width changing amount of the metal strip (being at both edges, 1/2 is reasonable).
  • the cooling roll #1 of the structure as shown in Fig.59 is used.
  • the cooling roll #1 has one coolant way ⁇ as spiral in the inside thereof near the surface, and the coolant as the cooling water is made go thereinto at its one end of the way ⁇ for cooling the roll surface, and after having deprived the heat of the contacting metal strip, the coolant is exhaused from the other end.
  • this cooling roll has excellent merits.
  • the roll quenching equipment generally uses the plurality of cooling rolls #1 to #7 which alternately contact the upper or rear surfaces of the strip X as seen in Fig. 60.
  • the coolant is supplied into the passages ⁇ of the rolls #1 to #7, and the heated coolant is collected at the delivery side and sent to a heat exchanger to cool down for re-using.
  • the metal strip X which has been cooled by the rolls #1 to #7 is ordinarily caused with the non-uniform temperature distribution shaped in W along the strip width as shown in Fig.43. This is assumed as a phenominon caused by the saddle shaped deformation in that the strip X is curled at both edges when the cooling rolls are wrapped with the strip X given the tension in the strip passing line.
  • the method of removing such a phenominon has already been referred to.
  • the present invention when carrying out the cooling on the metal by the metal strip cooling equipment, the present invention also proposes cooling rolls, by which non-uniform properties in the metal are not generated and a roll quenching equipment using such cooling rolls.
  • the cooling roll having the coolant passage at the inside thereof, on which the metal is contacted, it is advisable to use the cooling roll provided with a plurality of cooling passages on the same plane side.
  • the flowing direction of the coolant in the passage of each cooling roll is inverted per one piece to build the structure for supplying the coolant.
  • the conventional cooling roll has one coolant way in the inner circumferential surface thereof, the coolant of enough low temperature at the inlet of the way freely flows and continuously exchanges the heat of the metal during transferring, but goes up to almost saturated condition in the heat exchanging amount at the outlet of the way just before boiling if the coolant is the water.
  • the plurality of the ways are formed in the same plane face, each length of the coolant ways for the necessary cooling amount can be made short, so that the heat exchanging amount can be made small, which is as a result sufficient to cool the metal in the roll surface near even the outlet of the coolant passage, and the temperature distribution is symmetrical in the metal width after cooling.
  • the gradient of the temperature between the roll surfaces of the edge near the inlet of the coolant and near the outlet thereof occurs in the same direction in each cooling roll.
  • the flowing direction of the coolant is converted per each roll, so that above temperature gradient turns other way per each of the rolls and becomes smaller per each of the rolls, and accordingly the gradient itself becomes naught in the cooling roll in the delivery section.
  • the present invention also proposes a rapidly cooling method as bringing the temperature in the strip width nearly to the objective temperature distribution with respect to the wide range of the strip.
  • a cooling method of the metal strip which wraps the metal strip around at least one cooling roll and adjusts a wrapping length between said strip and each of the cooling rolls, comprising using a gas jet cooling equipment provided with nozzle headers which are opposite said roll via the strip and movable in the moving directions of the roll and along the roll axes and whose width is narrower than that of the strip so as to cool the strip on its rear surface by impinging the cooling gas from the nozzle header, adjusting, for cooling, the wrapping length between the strip and the cooling roll so as to adjust the temperature in the strip center based on the deviation from the objective strip temperature, always observing a temperature distribuition in the strip width at least at one side of the inlet or outlet of the cooling rolls, while adjusting the space between the strip and said nozzle header in view of the position between the roll and the nozzle header, and moving the nozzle headers to a position where the temperature deviation is naught with respect to said objective temperature distribution, thereby to control the strip temperature distribution based on the deviation from the objective temperature distribution
  • the hot points in the center and both edges are narrow in the width, and the conventional structure disclosed in Japan Patent Laid Open No.60-169524 was difficult to provide the effective cooling, but in the above structure, the nozzle header of the narrow width is moved immediately above the hot point and impinges the cooling gas thereonto concentrically, thereby enabling to effectively cancel the non-uniform temperature distribution. Then, a compariosn is made between the temperature in the strip center and the objective temperature having been set for practising a predetermined heating treatment on the metal strip, and the wrapping length of the metal strip and the cooling roll is adjusted for controlling the temperature in the strip center in accordance with the strip temperature deviation.
  • the nozzle header is moved to the position of cancelling the deviation from the objective temperature distribution (for this objective temperature distribution, a preset one may be used, for example, other than the objective distribution in the strip center, the actually measured temperature in the strip center or the lower temperature by 0 to 20°C than said actual temperature are made objective temperatures in both strip edges, and the objective temperature distribution may be determined thereby), and the control of the strip temperature distribution is carried out (i.e., the uniformalization of the strip temperature).
  • the pressure or the flow rate of the cooling gas flowed into the nozzle header based on the temperature deviation are adjusted, and such a structure of impinging the cooling gas to the metal strip may be incorporated thereinto.
  • nozzle header is movable along the cooling roll axis, because the cooling roll can be moved in the direction transverse with the strip pass line in order to change its wrapping length, and the nozzle header is required to always take the distance suited to cooling the rear side of the strip wrapped around the roll, and the header does not contact the metal strip.
  • the nozzle headers are moved to the position cancelling the deviation from the objective distribution to control the strip temperature distribution based on the deviation, referring to the temperature deviation from the objective distribution in both strip edges.
  • both edges are higher than the center part in the temperature, and so the nozzle header are moved preferentially to both strip edges.
  • the hot point in the center part ordinarily has the lower temperature than both edges, and if the strip changes its width, the hot point hardly changes its position. So, the above nozzle headers should be provided at both edges, and for removing the non-uniformity the nozzle header may be disposed at the center of the strip. In this case, such a nozzle header of the strip center moves only in the moving direction of the cooling roll and does not move along the roll axis, and only adjusts the pressure or the flow rate of the cooling gas in accordance with the temperature deviation with respect to the controlling of the strip temperature deviation based on the deviation from the objective distribution, for jetting the cooling gas to the metal strip.
  • the present invention can be of course applied not only to the structure of one cooling roll but also to that of two or more cooling rolls.
  • three of the nozzle headers are provided to at least a first cooling roll to build the above stated arrangement of the header. Further, these cooling rolls are divided into two sections of the entry section and the delivery section, and the three nozzle headers are provided to the cooling rolls in the entry section, while the two nozzle headers are provided to the cooling rolls in the delivery section.
  • the nozzle headers are three to the first cooling roll or the cooling rolls in the entry section, because, for the same reason as above stated, when the strip center swells at starting of the cooling, the non-uniform temperature distribution occurs, and once the non-uniformity occurs, it more grows due to the properties of the roll, and aiming at cancelling form errors at beginning to contact the roll, the nozzle header is provided to at least the first roll or the rolls in the entry section, thereby to carry out the concentrical cooling thereon as well as the cooling at the rear side thereof so as to solve the problem of the center swelling. If the structure has the three nozzle headers including the center nozzle header to the first roll or the rolls in the entry section, it is sufficient to respectively install the nozzle headers to both strip edges for the subsequent cooling rolls.
  • the nozzle header in the entry section it follows the moving of the cooling roll as maintaining a certain distance therefrom, and as to the nozzle header in the delivery section, it is moved to a predetermined position when ordinarily cooling, and is retreated to the retract position only at the emergency or when the cooling amount is fairly small, so that it does not follow the moving of the cooling roll.
  • the cooling length is largely taken by not only successively shifting the rolls from the upstream side in preference of the rolls in the entry section, in particular the first cooling roll, but also bringing the gas jetting ability to the maximum successively from the rolls in the upstream side so as to compensate the lacked cooling in the downstream.
  • the distance between the nozzle header and the metal strip is 5 to 50 mm, this is effective to precision of adjusting the movings of the cooling roll and the nozzle header, or avoidance of contacting between the nozzle header and the metal strip caused with the form error (e.g., edge wavings).
  • the distribution of the strip temperature based on the deviation from the objective distribution is controlled together with controlling of the average strip temperature. Then, important is the control of the cooling width by moving the nozzle header.
  • the nozzle headers are moved such that the positions of the nozzle headers positioned at both strip edges of the cooling equipment are within the cooling ranges as defined in the under formulae 8 and 9 with respect to both strip edges, thereby enabling to make the strip temperature deviation minimum.
  • the above problem may be solved by always measuring the temperature distribution in the strip width at the outlet of the cooling rolls, obtaining positions in the center of gravity of the deviation in the strip temperature of a range where the temperature deviation occurs in the edges and the center of the metal strip with respect to the objective strip temperature, moving the nozzle headers at the edges of the gas jet cooling equipment or the ones at the edges of the gas jet cooling equipment and the auxiliary gas jet cooling equipment such that a twice length of the distance from the strip edge to said center of gravity is the cooling width at the strip edges, moving the center nozzle header such that center position thereof agrees to the center of gravity at the center of the strip , and impinging the cooling gas to the metal strip from each of the nozzle headers.
  • the strip temperature distribution is uniformalized as No.2 in Fig. 56 under the conditions of Table 1, taking the nozzle header at the edges, for example.
  • Fig.1 is a schematic view showing a continuous annealing line of the metal strip X, having the roll quenching section with one embodiment of the present invention
  • Fig.2 is an explanatory view of one embodiment of the metal strip cooling equipment as set forth in claim 48
  • Fig.3 is a perspective view of the gas jet cooling equipment disposed opposite to the cooling roll
  • Fig.4 is a perspective view of the auxiliary gas jet cooling equipment installed after the cooling rolls
  • Fig.5 is a perspective view of the gas jet cooling equipment as set forth in claim 51 opposite to the cooling roll
  • Fig.6 is a perspective view of the auxiliary gas jet cooling equipment installed after the cooling rolls
  • Fig.7 is a schematic view of a facility showing a third embodiment where the gas jet cooling equipment as set forth in claim 32 is used in a roll quenching section of the continuous annealing line
  • Fig.8 is a partially enlarged view of the present embodiment of the gas jet cooling equipmnet
  • Fig.9 is an explanatory view showing
  • Fig.61 is a graph showing that the temperature distribution is not sysmmetrical in the strip width.
  • Fig.1 is the schematic view showing the continuous annealing line of the metal strip X, which has the roll quenching section one embodiment of the present invenion.
  • the metal strip X is uncoiled by a pay-off reel 2000, and is sheared by a shearing machine 2001 located in the entry side, followed by making a connection of a preceding coil and a subsequent coil by means of a welding machine 2002.
  • the metal strip is electrolytically degreased by a cleaning facility 2003 at the inlet, and comes, via a tension leveler 2004 as a stretcher, to an entry lopper 2005.
  • the strip is sent into a pre-heating furnace 2006 and a direct fired reducting furnace 2007 to heat at a temperature of 600 to 750°C, and heated up to a required temperature in a radiant tube furnace 2008 and maintained at this temperature in a radiant tube soaking furnace 2009, and cooled, for example, to 600°C in a gas jet cooling section 2010 and further cooled to 350°C in a roll quenching section 1000.
  • the metal strip is quenched in a water quenching section 2013 and dried with a dryer 2014, and after having passed through a delivery looper 2015, the metal strip is rolled in a required roughness by a temper mill 2016, and is inspected by a surface defector 2017 and oiled over with an oiler 2018, and sheared into a required length by a shearing machine 2019 in the delivery side, and is coiled by tension reels 2020.
  • the tension leveler 2004 is installed before the direct fired reducing furnace 2007 for reasons as follows.
  • a burner flame made in the direct fired reducing furnace 2007 has a suitable range of a distance from the strip X for reducing the heating, and if the burner flame does not touch the metal strip X within the range, it does not have any effect of reduction but causes oxidation.
  • a distance between top and lower rolls installed in the furnace is necessary to be at least 20 m, and it causes fluttering of the strip passing in the furnace.
  • the shape of the metal strip X it sometimes has uneveness or swell in its center, or edge waves. If a steepness a/w becomes larger, which is expressed with a ratio of the strip width w to a strain a of the metal strip showing a degree of a raising in the center in cross section of the metal strip X, the form of the strip gets worse.
  • the strip flutters as stated, and in addition, the strip greatly rolls by the burner pressure at combustion.
  • the metal strip X does not thereby contact the burner flame within said suitable range, and a problem of local oxidation appears.
  • the elongations occurring in particular area in the strip width can be hardly corrected, and if the strip is passed as it is into the gas jet cooling section 2010, it causes buckling there, and it is assumed that when the strip passes into the roll quenching equipment 1000, the part of the elongation does not fully contact the roll surface or forms a non-contacting state, so that it is difficult to make the strip temperature distribution uniform after a final cooling, and there occur metall-urgically unequal quality in the strip width or the rolling.
  • Fig.2 is the side view of the metal strip cooling equipment, which relates to the embodiment as set forth in claim 48. After having been heated, soaked and slowly cooled, the metal strip X is given tension by bridle rolls ⁇ 1 to ⁇ 3 and ⁇ 4 to ⁇ 6 which are located before and after the strip cooling equipment.
  • the tension of the metal strip X is changed up until a tension (3 kgf/mm2 or more) for using the roll by the bridle rolls ⁇ 1 to ⁇ 6 so as to stabilize the strip shape when contacting the roll.
  • the cooling rolls #1 to #4 are horizontally moved to contact the metal strip X, and the cooling rate is adjusted, while the shift stroke (wrapping length) of the roll is adjusted.
  • the non-uniform temperature distribution easily occurs in the direction of the strip width, and if such a distribution has occurred in the preceding gas jet cooling section 2010, this is accelerated in the roll quenching equipment, and therefore, in this embodiment, the rear side of the wrapped strip around the rolls is cooled by the metal strip cooling apparatus as follows.
  • This embodiment is composed of the gas jet cooling equipment which has nozzle header groups ⁇ 1 to ⁇ 4 where three nozzle headers make one group; a strip edge position detector 89 which is installed near the inlet of the metal strip cooling apparatus; position adjustment devices 82a to 82d for adjusting the nozzle headers moving in the direction of the roll axis; a calculation device 88 for nozzle header position control, which controls the position adjustment devices 82a to 82d in response to signals from the position detector 89; position adjustment devices 81a to 81d which adjust the positions of said nozzle header groups ⁇ 1 to ⁇ 4 in the transverse direction in response to signals from roll position adjustment devices 80a to 80d which control wrapped length of the strip around the cooling rolls as well as the positions of the respective cooling rolls #1 to #4; a strip temperature profile measuring equipment 90a for measuring the temperature distribution in the strip width, which is installed at the outlet of the cooling section; and a calculation device 87 for the strip temperature control, which controls at least either of pressure control valves 84a to 84d of said
  • the claculation device 88 for the nozzle header position control sends position controlling signals in the direction of the roll axis with respect to said nozzle header groups ⁇ 1 to ⁇ 4 to the position adjustment devices 82a to 82d. Therefore, said both side nozzle headers are moved to the positions corresponding to the strip edges, while the center nozzle header is moved to the position corresponding to the strip center.
  • a temperature in the center part of the strip width is obtained by the calculation device 87 for the strip temperature control, and which compares this temperature at the strip center with an objective strip temperature having been determined for practising a required heat treatment to the metal strip X, and signals are, in response to a deviation thereby, sent from the calculation device 87 to the devices 80a to 80d for adjusting the contacting lengths of the cooling rolls (as to others, in accordance with the signal from the strip temperature profile measuring equipment 90, the average temperature along the strip width is obtained by the calculation device 87 and which compares this average temperasture with an objective temperature having been determined for practising the required heat treatment to the metal strip X, and in response to the deviation thereby, the signal is sent from said device 87 to said devices 80a to 80d).
  • the objective temperature in the center part of the strip width is obtained from the average strip temperature of both quarter parts, and the objective temperatures in both strip edges are obtained from the measured strip temperature of the center part by means of the calculation device 87 for the strip temperature control which has been input with temperature signals from the strip temperature profile measuring equipment 90a. Actually measured temperatures in both edges and the center part are obtained, and are compared with said objective temperatures in the strip width.
  • the calculation device 87 uses at least one of the rotating speed control of a gas supply blower 85a or the pressure control valves 84a to 84d so as to adjust the pressure (a pressure gauge is omitted) of the cooling gas flowed into each nozzle header. Due to the above mentioned adjustment, both edges and the center of the metal strip X are cooled by the gas jetted from the nozzle header groups ⁇ 1 to ⁇ 4 installed in opposition to the cooling rolls.
  • the positions of the nozzle header groups ⁇ 1 to ⁇ 4 are adjusted in the moving directions of the cooling rolls by means of the position adjustment devices 81a to 81d by the position of the cooling rolls #1 to #4 as well as the signals from the roll position adjustment devices 80a to 80d which adjust the contacting lengths of the cooling rolls.
  • the nozzle header groups ⁇ 3 and ⁇ 4 may be set and fixed at positions where the distances between the metal strip and the nozzle header groups can be exactly secured for the space not to contact them and to cool the rear side of the strip effectively.
  • the auxiliary gas jet cooling equipment is installed at the outlet of the cooling roll groups in this embodiment so as to solve the deviation of the temperature along the width of the metal strip X, which has been difficult to perfectly overcome even in the above stated structure. That is, the calculation device 87 for the strip temperature control obtains the temperatures at both strip edges and the center part by the temperature signals from the strip temperature profile measuring equipment 90b installed around the outlet of the auxiliary gas jet cooling equipment, which can detect the temperature distribution in the strip width, or from said strip temperature profile measuring equipment 90a, and compares at the same time with said objective temperature in the strip width, and uses, in response to this deviation, at least one of the rotating speed control of the gas supply blower 85b or the pressure control valve 84e so as to adjust the pressure of the cooling gas flowed into each nozzle header.
  • the cooling gas is impinged from the nozzle header groups ⁇ 1 and ⁇ 2 of the auxiliary gas jet cooling equipment installed in opposition to the metal strip X, and the metal strip X passing through the roll quenching equipment is cooled at both edges as well as the center part thereof.
  • the position control signals are sent to the position adjustment devices 83a and 83b by the calculation device for the nozzle header position control, which has received the signal from the strip edge position detector 89, said nozzle headers of the groups ⁇ 1 and ⁇ 2 are moved to the positions corresponding to the strip edges, and the center nozzle headers are moved to the positions corresponding to the center part of the metal strip.
  • Fig.3 is the perspective view of the nozzle header groups ⁇ 1 to ⁇ 4 disposed toward the cooling rolls (the position adjustment device is omitted in this figure).
  • the nozzle headers ⁇ a and ⁇ c at both ends are used for cooling the strip edges, while the center nozle header ⁇ b is used for cooling the strip center.
  • position adjutment devices 820 to 822 are controlled respectively by the order for controlling the position in the roll axis from the calculation device 88 for the nozzle header position control, so that the movements are adjusted for the strip edges and center part.
  • the pressure of the cooling gas flowed into each of the nozzle headers ⁇ a to ⁇ c is adjusted by adjusting the open angles of the pressure control valves 840a to 840c provided on the half ways of the pipings communicating with the nozzle headers ⁇ a to ⁇ c by the order from the calculaiton device 87 for the strip temperature control.
  • Fig.4 is the perspective view showing one side parts of the nozzle header groups of the auxiliary gas jet cooling equipment disposed at the outlet of the roll quenching equipment and opposite the metal strip.
  • the nozzle headers ⁇ a and ⁇ c at both ends are for cooling the strip edges, while the nozzle header ⁇ b at the center is for cooling the center part of the strip.
  • the control of the position adjustment devices 830 to 832 is carried out respectively by the order for controlling the position in the roll axis from the calculation device 88 for nozzle header position control, so that the movements are adjusted for the strip edges and center part.
  • the pressure of the cooling gas flowed into each of the nozzle headers ⁇ a to ⁇ c is adjusted by adjusting the pressure control valves 843a to 843c provided on the half ways of the pipings communicating with the nozzle headers ⁇ a to ⁇ c by the order from the calculation device 87 for strip temperatreu control.
  • Fig.5 is the perspective views showing the structures of the nozzle header groups ⁇ 1 and ⁇ 2 of the gas jet cooling equipment in the metal strip cooling equipment opposite the cooling rolls as set forth in claim 51 (the position adjustment device is omitted in this figure).
  • the center nozzle header ⁇ d (the header body) shown with (a) and (b) in the same is to cool the center part of the strip, while the nozzle headers ⁇ a to ⁇ c and ⁇ e to ⁇ g (the header bodies) are to cool the strip edges.
  • ⁇ a and ⁇ g are the header bodies 10 positioned at the outsides of said equipment, ⁇ b and ⁇ f are the header bodies 10 positioned at the center parts thereof, and ⁇ c and ⁇ e are the header bodies 10 positioned at the insides of the same.
  • the nozzle headers ⁇ a to ⁇ c and ⁇ e to ⁇ g are moved to both strip edges by means of the position adjustment devices 820 to 822 by the order of controlling the positions in the roll aixs issued from the calculation device 88 for nozzle header position control, and then are set at positions for exactly securing the cooling widths by means of said nozzle headers ⁇ b and ⁇ f positioned at the centers of these edge position nozzle headers.
  • the center nozzle header ⁇ d as well as the centrally positioned header bodies ⁇ b and ⁇ f among the nozzle headers at both edges are adjusted with respect to the pressure of the cooling gas therewithin in accordance with the controlling order from the calculation devie 87a for strip temperature control.
  • the pressure of the cooling gas within the header bodies ⁇ a and ⁇ g positioned outside of the nozzle headers is adjusted in accordance with the control signal from the calculation devide 87b for strip temperature control, based on the signals from computers C storing information of the metal strip of a subsequent size.
  • the pressure of the cooling gas within the header bodies ⁇ c and ⁇ e positioned inside of the nozzle headers of the edge sides is adjusted in accordance with the control signal from the calculation device 87b for strip temperature control, basing on the signals from the computers C storing the information of the metal strip of the subsequent size.
  • Fig.6 is the perspective views showing the structures of the nozzle header groups ⁇ 1 and ⁇ 2 of the auxiliary gas jet cooling equipment in the metal strip cooling equipment disposed at the outlet of the cooling roll groups opposite the metal strip as set forth in claim 52.
  • the center nozzle header ⁇ d (the header body) shown with (a) and (b) in the same is to cool the center part of the strip, while the headers ⁇ a to ⁇ c and ⁇ e to ⁇ g shown with (a) and (c) are to cool the strip edges.
  • ⁇ a and ⁇ g are the header bodies positioned at the outsides
  • ⁇ b and ⁇ f are positioned at the center parts
  • ⁇ c and ⁇ e are positioned at the insides.
  • the nozzle headers ⁇ a to ⁇ c and ⁇ e to ⁇ g are moved to both edges of the strip by means of the position adjustment devices 830 to 832 by the order of controlling the positions in the strip width issued from the calculation device 88 for nozzle header position control, and then are set at positions for exactly securing the cooling widths by means of said nozzle headers ⁇ b and ⁇ f positioned at the center of these edge position nozzle headers.
  • the center nozzle header ⁇ d as well as the centrally positioned header bodies ⁇ b and ⁇ f among the nozzle headers at both edges are adjusted in accordance with the controlling order from the calculation device 87a for strip temperature control.
  • the pressure of the cooling gas within the header bodies ⁇ a and ⁇ g positioned outside of the nozzle headers of the edge sides is adjusted in accordance with the control signal from the calculation device 87b for strip tremperatrure control, based on the signals from computers C storing information of the metal strip of a subsequent size.
  • the pressure of the cooling gas within the header bodies ⁇ c and ⁇ e positioned inside of the nozzle headers of the edge sides is adjusted in accordance with the control signal from the calculation device 87b for strip temperature control, based on the signals from the computers C storing the information of the metal strip of the subsequent size.
  • Figs.7 to 9 show the embodiments where the gas jet cooling equipment is employed to the structure of cooling the rear side of the strip wrapped around the cooling roll, which is provided in the roll quenching equipment of the continuous annealing line for the metal strip X.
  • the cooling rolls #1 to #7 are vertically disposed in succession between the bridle roll ⁇ 1 at the inlet and the bridle roll ⁇ 2 at the outlet which give predetermined tension to the metal strip X, and the wrapping length between the roll and the metal strip is adjusted by the shifts in the horizontal direction of the respective cooling rolls.
  • the reference numeral 91 designates a profile thermometer at the inlet
  • 90 is a strip temperature measuring equipment at the outlet of the roll quenching equipment
  • 92 is a profile thermometer at the outlet
  • ⁇ 1 and ⁇ 2 are the auxiliary gas jet cooling equipment.
  • Curved nozzle headers ⁇ 1 to ⁇ 7 shown with the numeral 1 are disposed to the rear sides of the metal strip X wrapping around the cooling rolls.
  • each of the nozzle headers 1 is installed with a moving bed 3 which moves said nozzle header in the width of the metal strip X (called as “lateral directions” hereinafter) and the direction toward the surface of the metal strip (called as “back and forth directions” hereinafter).
  • the moving bed 3 is installed at the outside of the furnace shell.
  • the nozzle headers 1 are three provided at right, left and center along the cooling roll axis, and the cooling roll at the delivery section is determined in a curved size in accordance with the maximum shift stroke of the roll, and the width of each cooling roll is narrower than that of the metal strip X, and is designed in response to the width of the hot point when the temperature distribution is non-uniform in the strip width.
  • Nozzle mouths which are horizontally elongated and slitted are disposed in the plural steps at the surface of the gas impinging side.
  • Header supporters 100 of supporting the headers 1 are provided at a further rear side, which supply the cooling gas from the outsides to the headers 1. Since the header supporters 100 are projected outside of the furnace shell, a heat resistant non metallic bellows 101 is used between the circumference of the furnace shell and a penetrating part thereof, thereby to secure an enough moving range as keeping the air sealing.
  • the moving bed 3 comprises guide rails 31a, 31b provided in the back and force directions on a stationary bed 30; a base 32 movable therealong; a drive device 33 moving the base 32 in the back and forth directions; lateral guide rails 34a to 34c provided on the base 32 independently for the center, right and left nozzle headers; moving beds 35a to 35c laterally movable therealong; and drive devices 36a to 36c independently transfering the moving beds 35a to 35c in the lateral directions.
  • the header supporters 100 are fixed on the laterally movable beds 35a to 35c, respectively.
  • the drive devices 33 and 36a to 36c are those to be applied to linear motions as a hydraulic oil cylinder, an electric power cylinder, or a combination of a ball screw and an electric motor. If direct acting bearings are used as the guide rails 31a and 34a to 34c, the movement can be made at high precision. It is desirable to determine the moving speeds in the lateral directions with the under formula 18 and the moving speed in the back and forth directions with the under formula 19. [ 18] ( ⁇ W/2)/VN1 ⁇ L/VS herein,
  • the group of the headers ⁇ 3 to ⁇ 7 once goes forward from the retract position (which is, when any of the rolls cannot be used because of troubles, a retreating position determined in view of avoiding the contact with said roll, since this is so designed that the maximum length of the nozzle header can be taken by the maximum shift stroke of the rolls) at the same time of contacting between the strip X in the passing line and the cooling rols #3 to #7, and the headers do not move even if the shift stroke of the cooling rolls #3 to #7 is longer.
  • the profile thermometer 91 measures the temperature distribution in the strip width at the outlet of a gas jetting section. If the distribution is not uniform, the three cooling positions of the center, right and left nozzle headers 1 are determined for cooling the rear sides of the strip wrapped around the rolls in accordance with measured data thereby and detecting data of the strip edges by the profile thermometers 91 and 92, and the nozzle header 1 are individually moved to the hot points of the center in the strip width and the right and left strip edges thereof.
  • Such cooling positions of the nozzle headers 1 is also determined in accordance with the measured result of the distribution by the profile thermometer 92 at the outlet of the roll quenching equipment, but the former feed-forward control is usually carried out in preference to this feed back control (either of the former feed-forward control or latter feed-back control may be of course practised).
  • the center nozzle header does not laterally move but moves back and forth as seen in Figs. 10 to 12.
  • the capacity of the center nozzle header may be smaller than those of the right and left nozzle headers 1.
  • the cooling efficiency by the gas jetting of the header is controlled by controlling the the gas jetting amount or the gas pressure in accordance with the measuring values of the profile thermometer 92 at the outlet.
  • the adjustment of the nozzle header 1 moving in the lateral directions is also required when the welding point (the strip particular point) where the strip width changes, enters the rolls. That is, the information of the strip particualr point is input in advance from the inlet of the line, so that when the material of the narrow width changes to that of the wide width, the moving of the right and left nozzle headers to the predetermined position has completed before said strip particular point passes the profile thermometer 91 at the inlet. Reversely, when the material of the wide width changes to that of the narrow width, the right and left nozzle headers are moved to the predetermined position after the particular point passes the profile thermometer 92 at the outlet.
  • the auxiliary gas jet cooling systems ⁇ 1 and ⁇ 2 are auxiliary structures for cancelling the non-uniformity of the temperature distribution along the strip width which has not been completely cancelled by the above mentioned structure of cooling the rear side of the strip wrapped around the cooling roll in this embodiment, and laterally move the nozzle headers at the backward of the gas jet cooling equipment for jetting the cooling gas toward the hot points.
  • Figs. 10 to 12 show an embodiment as claimed in claim 33 where the center nozzle header 1 does not laterally move.
  • the header supporter 100 for the center nozzle header 1 is directly fixed on the base 32 of the moving bed 3 (there are neither the guide rail 34b, the lateral moving bed 35b nor the drive device 36b. See Fig. 12).
  • the nozzle headers 1 at both edges can , as seen in Fig.11, move in the lateral directions as in the preceding embodiment.
  • the cooling ability of the center nozzle header 1 is smaller than those of the right and left nozzle headers 1.
  • Figs.13 to 16 show a structure as claimed in claim 34 which is applied to the cooling equipment of the horizontal pass line.
  • #1 to #3 designate the cooling rolls, and the curved nozzle headers 1 are disposed at the rear sides thereof via the metal strip X.
  • These header supporters 100 penetrate outside through the furnace shell, and bellows 101 are attached at the penetrating parts.
  • Fig.14 shows the transversely cross sectional view of the cooling roll #1 of the preceding figure.
  • the three nozzle headers 1 are arranged just above the metal strip X in parallel along the width direction, and the header supporters 100 pass outside through the bellows 101. These header supporters 100 are held under a condition that they are movable laterally, back and forth in the outside by the moving bed 3.
  • the header supporters 100 pass through an elevator 37 of the moving bed 3, and are, as shown in Figs.15 and 16, suspended from carts 35a to 35c which are movable along guide rails 34a to 34c installed on the elevator 37 along the strip width, and further are connected to rods of drive devices 36a to 36c, and since the header supporters 100 are laterally moved by the drive devices 36a to 36c, the three nozzle headers can be laterally moved, respectively.
  • the elevator 37 is connected to rods of elevating devices 38a and 38b, so that the elevator 37 can be moved back and forth by the driving of the elevating devices 38a and 38b.
  • Figs.17 and 18 show an embodiment where the present embodiment is used to the auxiliary gas jet cooling equipment installed at the outlet of the roll quenching equipment of the continuous annealing line.
  • the cooling rolls #1 to #7 contacting the metal strip X are successively installed in the vertical direction, and the auxiliary gas jet cooling equipment of the present structure is disposed at the outlet as seen in the preceding embodiment.
  • guide rails 4 are provided in parallel to the pass line of the metal strip X, and the running cart 5 is mounted on the guide rails 4, and the above mentioned moving device is composed of these two structures.
  • the running cart 5 is mounted with nozzle headers ⁇ having gas jetting nozzles and narrower widths than the strip width in parallel to the pass line, said nozzle headers being two at the one side, i.e., four ( ⁇ 1 to ⁇ 4) in total at both sides.
  • the cart 5 runs along the guide rails 4 by a running mechanism 6, so that the nozzle headers ⁇ can be moved along the strip width.
  • Each of the nozzle headers ⁇ is provided with a piping 7 to be a gas supply passage, and said piping 7 is diverged at the center thereof and connected to the upper and lower parts of each nozzle header ⁇ .
  • center nozzle headers ⁇ 5 and ⁇ 6 (the rear side) are fixed along the pass line at the center in the strip width so as to cool the hot points occuring in the center in the strip width.
  • the hot points in this part are almost at the same positions, even if the widths of the metal strip change, and since the temperature in said hot point in the center is usually lower than those in both strip edges, the position of the header is not changed, and the length thereof is shorter than those of the other nozzle headers ⁇ 1 to ⁇ 4.
  • the guide rails 4 are provided transversely and in parallel with the strip width, said guide rails being two at the upper and lower parts of the one side of the metal strip X, i.e., four in total at both sides.
  • the upper guide rails 40 and 41 are, as seen in Figs. 19 and 20, wedge-shaped in cross section so as not to make rattling when upper running carts 50 to 53 mount thereon, having wheels 500 defined with conical groove, and such a structure provides a proper space between the nozzle header ⁇ and the metal strip X.
  • Lower guide rails 42 and 43 have structures which make plays Y1 and Y2 to the upper and the right and left between bobbin shaped wheels 501 of the lower carts 54 and 57, taking into consideration influences by heat expansion of the nozzle header ⁇ and warp of the rail (Y1 is determined considering the providing precision of the nozzle header ⁇ and the heat expansion, and Y2 is determined considering the providing precision of the rail).
  • shielding plates 502 are furnished at the sides facing the metal strip X so that the upper and lower guide rails 4 are not bent due to local heating by radiation from the strip.
  • the running cart 5 there are the upper carts 50 to 53 mounting the wheels 500 on the upper guide rails 40 and 41, and the lower carts 54 to 57 idling the wheels 501 on the lower guide rails 42 and 43, and the upper carts 50 to 53 suspend the nozzle header ⁇ , and the lower carts 54 to 57 are used so that the lengthy nozzle header ⁇ keeps parallel with the metal strip X.
  • the nozzle header ⁇ is lengthy along the pass line. A plurality of nozzles lengthy along the nozzle width are provided at the surface and the width of the nozzle is predetermined in accordance with the temperature distribution. The distance between the nozzle and the metal strip X should be for obtaining desired heat transfer and avoiding the contact with the metal strip X.
  • the nozzle header ⁇ is substantially suspended from the upper carts 50 to 53, and is auxiliarily supported by the lower carts 54 to 57.
  • screw jacks 600 which are provided to the outside of the furnace shell along the guide rails 4, are basically composed of two at the upper and lower parts of one side in the strip width and four at the upper and rear sides, i.e., eight in total, and comprise drive shafts 602 connected thereto by encircling expansions 601, drive motors 603a and 603b disposed in the strip width for giving the driving force to the screw jacks 600, gear boxs 604 for transmitting the driving force, synchroneous rotation gears 605 mounted on input shafts of the screw jacks 600 for transmitting the driving force, and roller chains 606 bridged between the upper and lower synchroneous gears 605.
  • the driving motors 603a or 603b are positioned at respective one sides of the furnace shell, and the rotating shafts thereof are connected to the gear boxs 604 and divided into two shafts which joint with input shafts of the screw jacks 600 for moving the drive shafts 602 back and forth. Since the respective drive shafts 602 are connected to the lower carts 54 and 56 or 55 and 57, the lower carts run along the lower guide rails 42 and 43 by moving the drive shafts back and forth.
  • the synchroneous rotating gears 605 mounted on the input shafts of both screw jacks 600 transmit their own rotating drive force to the synchroneous rotating gears 605 of the upper screw jacks 600 so as to move back and forth the drive shafts 602 connected to said screw jacks 600 in the same manner.
  • the rotation of one driving motor 603a or 603b causes the upper and lower carts 5 which are four in total at one side of the strip width to run along the upper and lower guide rails 40 to 43 synchroneously.
  • the reference numeral 607 of Fig.22 designates a sensor for detecting the position of the header, which counts the rotation number of the screw jack 600 and transmits it to a motor control device 608, whereby this device 608 controls the drive motor 603a or 603b.
  • the moving distance of the cart at this time is determined considering the width of the metal strip X.
  • the piping 7 laid from the outside of the furnace shell into the inside thereof, and are branched into the upper and lower parts and connected with the the upper and lower parts of one nozzle header ⁇ for supplying the cooling gas from the outside into the nozzle header ⁇ .
  • the piping 7 is also interposed with expansions 70 in the branched part, thereby enabling to follow the movings of the nozzle headers ⁇ 1 to ⁇ 4.
  • Controlling the gas pressure or amount of the cooling gas supplied through the piping 7, causes the cooling amount control to the strip X using each of the nozzle headers ⁇ 1 to ⁇ 4.
  • a telescopic means 71 instead of said expansion 70 or employ a flexible structure to be used under the air sealing condition.
  • the cooling rolls #1 to #7 are, as said above, moved horizontally to contact the metal strip X at a time when the tension of the metal strip X is varied up to the tension (3 kgf/mm2 or more) for using the roll by the bridle rolls ⁇ 1 and ⁇ 2, and the cooling rate is adjusted as adjusting the shift stroke of the roll (the wrapping length), and also in the present roll quenching equipment, the rear side of the strip wrapped around the roll is cooled by the gas jet cooling equipment.
  • the headers ⁇ 1 to ⁇ 7 for cooling the rear sides of the strip wrapped around the rolls are moved to the hot points by controlling the movements of the headers ⁇ 1 to ⁇ 7 in the transverse direction with the strip surface and in the strip width direction.
  • the rear side of the strip is cooled as maintaining suitable distances.
  • the auxiliary gas jet cooling equipment at the delivery section is provided as an auxiliary cooling structure for the roll quenching equipment to cancel the non-uniform temperature distribution occuring along the strip width, which could not be completely cancelled with said rear cooling equipment, and the nozzle headers ⁇ 1 to ⁇ 4 are moved laterally in the delivery section to impinge the cooling gas toward the hot points from both surfaces of the metal strip X.
  • the positions to be cooled of the nozzle headers ⁇ 1 to ⁇ 4 are determined in accordance with the measured data and the detected data of the strip edges by the profile thermometers 91 and 92, driving the drive motors 603a and 603b so as to individually move the groups of the carts 50, 52, 54, 56 and the group of the carts 51, 53, 55, 57, and respectively moving the groups of the nozzle headers ⁇ 1 and ⁇ 3 as well as ⁇ 2 and ⁇ 4 to the hot points of both strip edges in the strip X width.
  • the position of the hot point in the strip center is not changed though the strip width is varied, and since the temperature thereof is lower than that of the strip edge, the nozzle headers ⁇ 5 and ⁇ 6 of the center are fixed, and the cooling ability of the header is smaller than those of the right and left nozzle headers ⁇ 1 to ⁇ 4.
  • the adjustment of the movement in the strip edges of the nozzle headers ⁇ 1 to ⁇ 4 is necessary also when the welding part (the particular point) of the strip is coming. That is, when the information of the particular point is in advance obtained from the inlet of the line, changing from the narrow width to the wide width, the nozzle headers ⁇ 1 to ⁇ 4 have been moved to the predetermined positions before said particular point passes the profile thermometer 91. Reversely when changing from the wide width to the narrow one, the nozzle headers ⁇ 1 to ⁇ 4 begin to move toward the predetermined positions after the particular point passes the profile thermometer.
  • Figs.26 to 31 show the structure as claimed in claim 41 where this structure is applied to that the pass line of the metal strip X is horizontal.
  • Fig.26 is a plan view of one side of the horizontal pass line, and the guide rails 4 are laterally provided to the pass line, and the running cart 5 is movable along the guide rails 4.
  • the nozzle header ⁇ mounted on the cart 5 and having the gas jetting nozzles, which has the narrower width than the strip width, is parallel to the pass line.
  • the running cart 5 travels on the guide rails 4 by means of the running mechanism 6 (which is composed of eight screw jacks 600 along the guide rails 4 outside of the furnace shell, drive shafts 602 connected thereto by encircling the expansions 601, drive motors 603a, 603b giving the driving force to the input shafts of the screw jacks 600, synchroneous rotating gears 605 mounted on the rotation shafts of the screw jacks 600 for transmitting the driving force, and a roller chain 606 bridged between the synchroneous rotating gears 605), so that the nozzle header ⁇ can be moved in the strip width direction.
  • the running mechanism 6 which is composed of eight screw jacks 600 along the guide rails 4 outside of the furnace shell, drive shafts 602 connected thereto by encircling the expansions 601, drive motors 603a, 603b giving the driving force to the input shafts of the screw jacks 600, synchroneous rotating gears 605 mounted on the rotation shafts of the screw jacks 600 for transmitting the driving
  • Fig.28 shows the engagement between the guide rail 40 and the the wheel 503 of the upper running cart 51 at the inlet of the preceding figure.
  • Fig.29 shows the engagement between the guide rail 42 and the wheel 504 of the upper running cart at the outlet
  • Fig.30 shows the engagement between the guide rail 41 of the wheel 503 of the lower cart 53 at the inlet
  • Fig.31 shows the engagement between the guide rail 43 and the wheel 504 of the lower cart 57 at the outlet.
  • the upper and lower guide rails 40 and 41 at the inlet are shaped in wedge in cross section so as not to make rattlings when the wheel 503 of the conical groove mounts thereon as shown in the preceding embodiment, while, taking the amount ⁇ 1 of thermal expansion into consideration, the guide rails 42 and 43 at the upper and lower outlet have plain structures of width of at least ⁇ 1 so that the disc shaped wheel 504 may slide thereon.
  • the structure of the cooling rolls #1 to #7 to be used to the roll quenching equipmenmt 1000 are made as shown in Fig. 32 illustrating the cross sectional structure of the roll and Fig.33 illustrating the development thereof, and the cooling water running channels into the cooling rolls #1 to #7 are shown in Fig.34.
  • Each of the roll bodies of the cooling rolls #1 to #7 is composed of an inner tube 1001 formed with water flowing passages ⁇ as coolant passages and all outer tube 1002 secured to the circumference of the inner tube 1001 by a shrinkage fitting.
  • the water flowing passage ⁇ as seen in Fig.33, six passages ⁇ 1 to ⁇ 6 are spirally provided in the direction of the roll shaft in parallel on the same plain surface.
  • the water flowing channels into the cooling rolls #1 to #7 have, as shown in Fig.34, two passages of cooling water supplying pipes 1010 and cooling water discharging pipes 1011.
  • the supplying pipes 1010a and the discharging pipes 1011b are alternately disposed at one sides of the cooling rolls #1 to #7, while discharging pipes 1011a and supplying pipes 1011b are correspondingly disposed at the other sides, and thus the supplying and discharging pipings are connected such that they are alternately opposited by the back and forth pipings.
  • the flowing directions of the cooling water in the passages ⁇ of the cooling rolls #1 to #7 may be reversed per each of them.
  • the above water passages are six in the present embodiment, and a general determination of several passages will be referred to.
  • the flow velocity of the cooling water in the passage must be set to be 1.3 to 4.0 m/sec at the part of a wall around the outlet of the water to be at high temperature.
  • the number of the water passages is selected which satisfies the flow velocity of the cooling water, the water temperature at the outlet of the roll, the cooling rate CR (J), the average cooling rate ACR, and the average overall heat absorption rate AUo.
  • the calculation shown in the flow chart of Fig.37 is as follows. At first, the roll position [X(I), Y(I)] at a time of the maximum wrapping of the metal strip X is read out, and this position is made an initial value. Subsequently, calculations are made of the roll wrapping length LS (I) of the metal strip X, the wrapping angle AR(I), the total wrapping length TLL, and the total pass length LO. Conditions are determined that the strip temperature at the inlet TSE is as TS (I), the water temperature at the inlet TWE is as TWE (I), the wrapping length LS is as LS (I), the wrapping angle AR is as AR (I), the thickness RST of the roll shell is as RT (I), and the roll diameter D is as D (I).
  • Shapes of elongated parts in the metal strip X may be corrected by the tension leveler 2004, thereby to create no buckling in the gas jet cooling section 2010 and largely improve the buckling and the non-uniform cooling in the roll quenching equipment 1000, and as a result, the metal strip X does not roll in said line, and qualifies of products are improved. Further, there have been no problems of contacting with the tubes in the radiant tube furnace 2008 and the soaking furnace 2009, contacting with the gas jetting nozzle in the gas jet cooling section 2010, contacting with the nozzle headers ⁇ 1 to ⁇ 7 for jetting the cooling gas to the rear sides of the strip wrapped around the cooling rolls in the roll quenching equipment 1000 and contacting with the gas jetting nozzles in the fast cooling section 2012.
  • the tension of the metal strip X is varied until the tension (3 kgf/mm2 or more) for using the roll by means of the bridle rolls ⁇ 1 and ⁇ 2, and the cooling rolls #1 to #7 are moved in the horizontal direction to contact the metal strip X, and the cooling amount is adjusted as controlling the shift stroke (the wrapping length).
  • the water passages ⁇ 1 to ⁇ 6 spirally running are six, and so the length of each of the passages ⁇ 1 to ⁇ 6 can be made short, and the heat exchanger duty of the cooling water can be made small.
  • the cooling is sufficiently effective to the metal strip X at the roll surface at the edges near the outlet of the passage, and after cooling, the temperature distribution along the strip width is almost symmetrical.
  • the temperature distribution in the strip width X is detected by the strip temperature profile measuring equipment 90a intalled at the outlet of the cooling roll groups #1 to #4, and in accordance with the temperature signals thereof, a comparison is made between the temperature in the strip center and an objective temperature of the strip by means of the calculation device 87 for strip temperature control. With respect to the control of the average strip temperature based on the deviation of the strip temperature therebetween, the wraapping length between each of the cooling roll groups #1 to #4 and the metal strip X is adjusted by the roll position adjustment device 80.
  • a locus of the metal strip X wrapping around the cooling rolls is obtained from the position of each of the cooling rolls #1 to #4 such that the metal strip X does not contact the nozzle headers ⁇ 1 to ⁇ 4 of the gas jet cooling equipment installed against the cooling roll groups #1 to #4, and each nozzle header of the gas jet cooling equipment is moved in the moving direction of the cooling roll by the position adjustment device 81 so as to provide an appropriate distance therebetween.
  • the positional adjustments are respectively made so as to provide a cooling width (the cooling width at the super-imposed part of the nozzle header and the metal strip) shown in the formulae 8 and 9 to the nozzle headers of both edges, and so as to provide coincide between the center of the strip width and the center of the nozzle headers with respect to the center nozzle header. More specifically referring to with Figs.3 and 4, the nozzle heades ⁇ a and ⁇ c at both edge sides of the gas jet cooling equipment facing the cooling rolls are adjusted positionally by means of the position adjustmetn devices 820 and 822 in the devices 82 connected to the nozle headers of both edges, while the center nozzle header ⁇ b is adjusted positionally by means of the position adjustment device 821 connected to the center nozzle header.
  • the nozzle headers ⁇ a and ⁇ c of both edges of the auxiliary gas jet cooling equipment installed at the outlet of the cooling roll groups #1 to #4 are adjusted positionally by means of the position adjustment devices 830 and 832 connected to the nozzle headers at both edges in the devices 83, while the center nozzle header ⁇ b is adjusted positionally by means of the position adjustment device 831 connected to the center nozzle header.
  • the measured strip temperature distribution and the objective strip temperature distribution are compared by the calculation device 87 for strip temperature control.
  • at least one of rotating speed of the cooling gas supplying blowers 85a and 85b or the pressure control valves 84a to 84e is used to adjust the cooling gas pressure (a pressure gauge is omitted) within the nozle headers ⁇ , ⁇ of the gas jet cooling equipment and the auxiliary gas jet cooling equipment, and impinge the adjusted cooling gas to the metal strip X.
  • the cooling gas is supplied to the gas jet cooling equipment and the auxiliary gas jet cooling equipment from the interior of the furnace (omitted in Fig.2) via the heat exchanger 86 and the cooling gas supplying blower 85.
  • the strip temperature profile measuring equipment are installed at the outlets of the cooling roll groups #1 to #4 and the auxiliary gas jet cooling equipment, but it is sufficient to install the measuring equipment only at the outlet of the auxiliary gas jet cooling equipment.
  • the radii of the rolls are F1 and F2
  • the axis distance between the rolls is L0
  • the projecting lengths of the rolls from the basic line when the roll are not made contact the strip X are L1 and L2
  • the wrapping angle of the roll and the strip X is ⁇
  • angles of the nozzle headers ⁇ 1, ⁇ 2 are ⁇ 1 and ⁇ 2.
  • the lower nozzle header ⁇ 2 is considered.
  • a coordinate of A point as a contact point between the strip X and the lower cooling roll #2 is expressed by the under formula 26.
  • a coordinate of B point as a contact point between the strip X and the upper cooling roll #1 is expressed by the under formula 27.
  • the inclination of a linear part of the strip X is expressed by the under formula 28.
  • the contact angle ⁇ is expressed by the under formula 29. From this formular 29, the under formula 30 will be given.
  • the linear part of the strip X is expressed by the under formula 31.
  • the function of the formula 35 is obtained by the method of least square from the measured result of the strip temperatuer ("90" of Fig.2).
  • the cooling may be properly practised as covering the delays in moving of the nozzle headers in the line where the strip width is frequently changed, thereby enabling to cool in the strip width uniformly and quickly.
  • the nozzle headers are moved to the non-uniform ranges of the strip temperature distribution, and the cooling gas is impinged as maintaining the appropriate separating distance so that the temperature distribution can be controlled along the strip width.
  • each length of the passages can be as a whole made short, and the heat exchanger duty of the coolant running in the passage can be reduced.
  • the metal is also effectively cooled on the roll surfaces at the edges near the outlet of the coolant passage, and the temperature distribution along the strip width can be uniformalized during cooling, and the temperature distribution is almost symmetric in the strip width after cooling.
  • the present invention can be applied to cooling structure of the rear sides of the strip wrapped around the cooling rolls of the roll quenching equipment, and to the auxiliary cooling structure at the inlet and outlet of the roll quenching equipment.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP93913561A 1992-06-23 1993-06-22 Kühlungsvorrichtung und -verfahren für metallband Expired - Lifetime EP0614992B1 (de)

Applications Claiming Priority (25)

Application Number Priority Date Filing Date Title
JP18744192 1992-06-23
JP18743992 1992-06-23
JP187440/92 1992-06-23
JP18744092 1992-06-23
JP187439/92 1992-06-23
JP187441/92 1992-06-23
JP5112488A JPH06306485A (ja) 1993-04-16 1993-04-16 金属帯の熱処理装置
JP112488/93 1993-04-16
JP152636/93 1993-06-01
JP5152634A JPH06340913A (ja) 1993-06-01 1993-06-01 金属帯のガス冷却装置
JP152634/93 1993-06-01
JP15263593A JP3191495B2 (ja) 1993-06-01 1993-06-01 金属帯のガス冷却装置
JP152635/93 1993-06-01
JP5152636A JPH06340928A (ja) 1993-06-01 1993-06-01 冷却ロール及びそれを使用したロール冷却設備
JP5156362A JP2979903B2 (ja) 1992-06-23 1993-06-03 金属帯冷却方法
JP5156361A JP2979902B2 (ja) 1992-06-23 1993-06-03 金属帯冷却装置
JP156361/93 1993-06-03
JP156362/93 1993-06-03
JP173682/93 1993-06-22
JP5173683A JP2906927B2 (ja) 1993-06-22 1993-06-22 金属帯冷却装置
JP5173682A JP2979908B2 (ja) 1992-06-23 1993-06-22 金属帯冷却装置
JP173683/93 1993-06-22
PCT/JP1993/000843 WO1994000605A1 (en) 1992-06-23 1993-06-22 Metal band cooling apparatus and cooling method therefor
JP173684/93 1993-06-22
JP5173684A JPH0711346A (ja) 1993-06-22 1993-06-22 金属帯ガス冷却装置

Publications (3)

Publication Number Publication Date
EP0614992A1 true EP0614992A1 (de) 1994-09-14
EP0614992A4 EP0614992A4 (en) 1996-10-30
EP0614992B1 EP0614992B1 (de) 1999-04-21

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EP (1) EP0614992B1 (de)
KR (1) KR0159121B1 (de)
CN (1) CN1040130C (de)
CA (1) CA2116230A1 (de)
DE (1) DE69324566T2 (de)
RU (1) RU2120482C1 (de)
WO (1) WO1994000605A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2822850A1 (fr) * 2001-04-02 2002-10-04 Nippon Steel Corp Appareil de refroidissement rapide d'un feuillard

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE524588C2 (sv) * 2002-12-23 2004-08-31 Sandvik Ab Förfarande jämte anordning för att kyla band- och trådmaterial
FR2897620B1 (fr) * 2006-02-21 2008-04-04 Stein Heurtey Procede et dispositif de refroidissement et de stabilisation de bande dans une ligne continue
JP5197967B2 (ja) * 2007-02-06 2013-05-15 三菱日立製鉄機械株式会社 水切り装置
DE102007053523A1 (de) 2007-05-30 2008-12-04 Sms Demag Ag Vorrichtung zur Beeinflussung der Temperaturverteilung über der Breite
CN101993994B (zh) * 2010-11-29 2012-08-08 苏州中门子科技有限公司 带材热处理设备上的水冷装置
JP2014091157A (ja) * 2012-11-06 2014-05-19 Saco Llc 非晶質合金箔帯の製造装置および非晶質合金箔帯の製造方法
FR3014447B1 (fr) * 2013-12-05 2016-02-05 Fives Stein Procede et installation de traitement thermique en continu d'une bande d'acier
CN105648196B (zh) * 2014-10-11 2017-12-15 江苏菲亚德印务有限公司 钢带高频淬火机
TWI616537B (zh) * 2015-11-19 2018-03-01 財團法人金屬工業研究發展中心 金屬材熱處理方法
JP7139151B2 (ja) * 2018-05-25 2022-09-20 株式会社ジェイテクトサーモシステム 熱処理装置および金属部品の製造方法
JP2019203186A (ja) * 2018-05-25 2019-11-28 光洋サーモシステム株式会社 熱処理装置および金属部品の製造方法
CN109116891B (zh) * 2018-08-01 2021-04-09 首钢智新迁安电磁材料有限公司 一种热处理炉带钢缓慢冷却的控制方法
CN109333374A (zh) * 2018-12-03 2019-02-15 山西太钢不锈钢股份有限公司 钢板表面氧化物去除方法
CN109722526B (zh) * 2019-01-15 2020-01-07 重庆市霆驰新材料科技有限公司 一种防止键合金丝退火后产生粘连现象的冷却装置
CN110699522A (zh) * 2019-11-23 2020-01-17 宁波蜗牛锻造有限公司 一种用于控制臂的冷却设备结构
CN111571235B (zh) * 2020-05-12 2022-06-14 艾伯纳工业炉(太仓)有限公司 一种金属板材的热成型生产线
CN111593291B (zh) * 2020-06-24 2022-05-27 合肥学院 一种高温诱导钛锆基合金表面耐蚀氧化层的制备方法
CN116391061A (zh) * 2020-10-21 2023-07-04 应用材料公司 用于在卷材涂覆工艺中使用的滚筒装置、卷材涂覆设备和用于在卷材涂覆工艺中控制卷材的温度的方法
CN115889711B (zh) * 2022-12-22 2024-01-23 常州创明磁性材料科技有限公司 一种纳米晶带材在线冷却装置及冷却方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145485A2 (de) * 1983-12-15 1985-06-19 Mitsubishi Jukogyo Kabushiki Kaisha Verfahren zur Temperatursteuerung von Stahlbändern in der Kühlzone von Durchlaufglühöfen
EP0230780A1 (de) * 1985-12-24 1987-08-05 Kawasaki Steel Corporation Verfahren zum Kühlen von Bandstahl
CA2047793A1 (en) * 1990-07-31 1992-02-01 Osami Yoshioka Apparatus for continuously cooling metal strip

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59129737A (ja) * 1983-01-13 1984-07-26 Kawasaki Steel Corp 金属ストリツプの板幅方向温度分布制御方法
JPS59229422A (ja) * 1983-06-11 1984-12-22 Nippon Steel Corp 連続焼鈍における鋼帯の冷却方法
JPS6267125A (ja) * 1985-09-20 1987-03-26 Kawasaki Steel Corp 連続焼鈍炉における鋼帯冷却方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145485A2 (de) * 1983-12-15 1985-06-19 Mitsubishi Jukogyo Kabushiki Kaisha Verfahren zur Temperatursteuerung von Stahlbändern in der Kühlzone von Durchlaufglühöfen
EP0230780A1 (de) * 1985-12-24 1987-08-05 Kawasaki Steel Corporation Verfahren zum Kühlen von Bandstahl
CA2047793A1 (en) * 1990-07-31 1992-02-01 Osami Yoshioka Apparatus for continuously cooling metal strip

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9400605A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2822850A1 (fr) * 2001-04-02 2002-10-04 Nippon Steel Corp Appareil de refroidissement rapide d'un feuillard
EP1375685A1 (de) * 2001-04-02 2004-01-02 Nippon Steel Corporation Vorrichtung zum schnellen abkühlen von stahlband in apparatur zum kontinuierlichen glühen
EP1375685A4 (de) * 2001-04-02 2005-12-07 Nippon Steel Corp Vorrichtung zum schnellen abkühlen von stahlband in apparatur zum kontinuierlichen glühen

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DE69324566T2 (de) 1999-10-28
DE69324566D1 (de) 1999-05-27
EP0614992A4 (en) 1996-10-30
EP0614992B1 (de) 1999-04-21
WO1994000605A1 (en) 1994-01-06
CN1040130C (zh) 1998-10-07
RU2120482C1 (ru) 1998-10-20
CN1088621A (zh) 1994-06-29
RU94016952A (ru) 1997-02-27
KR0159121B1 (ko) 1999-01-15
CA2116230A1 (en) 1994-01-06

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