EP0350173A1 - Verfahren und Vorrichtung zum kontinuierlichen Glühen - Google Patents

Verfahren und Vorrichtung zum kontinuierlichen Glühen Download PDF

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Publication number
EP0350173A1
EP0350173A1 EP89306102A EP89306102A EP0350173A1 EP 0350173 A1 EP0350173 A1 EP 0350173A1 EP 89306102 A EP89306102 A EP 89306102A EP 89306102 A EP89306102 A EP 89306102A EP 0350173 A1 EP0350173 A1 EP 0350173A1
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EP
European Patent Office
Prior art keywords
strip
furnace
feed
loop
annealing
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.)
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Application number
EP89306102A
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English (en)
French (fr)
Inventor
Thomas A. Sellitto
Willis E. Perry
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Individual
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Individual
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Publication date
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Publication of EP0350173A1 publication Critical patent/EP0350173A1/de
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54Furnaces for treating strips or wire
    • C21D9/56Continuous furnaces for strip or wire

Definitions

  • This invention relates to an apparatus for continuous annealing of metal strips and a method therefor, and more specifically to a method and apparatus for continuous annealing of metal strips including a vertical accumulator furnace.
  • Continuous annealing of strip metal has been practiced in the steel industry for many years.
  • the process normally involves the feeding of a continuous metal strip to an annealing oven. Feeding of the strip must be continuous, since any overheating of the strip held in the oven results in the formation of undesirable grain structure. Once overheated the strip is lost due to its poor grain structure and the corresponding reduction in quality which is experienced with such structure.
  • Use of accumulators in the annealing line ensures that continuous flow of the strip is provided to an annealing oven during the joining of additional strips to the continuous strip, and continuous flow from the oven when a take-up coil has been completed and the strip is severed to permit another coil to be formed.
  • a problem with prior continuous strip annealing practices is that significant additional equipment must be added to the annealing line in the form of ac­cumulators.
  • the purchase of such additional equipment requires significant initial capital investment, requires continued support due to normal operating problems and maintenance requirements, and occupies additional plant floor space.
  • Patent 4,395,021 wherein a vertical annealing furnace for receiving a catenary metal strip, includes two furnace covers forming associated pre-heat and heating chambers.
  • Patent 3,152,794 Another effort is the proposal of Patent 3,152,794, wherein two catenary loops of metal strip are shown as being variable in length with respect to one another, i.e., as one is shortened the other is extended. By rotation of input and output pinch rolls feeding the strip to and from the loops, respectively, the loops are shortened or lengthened as needed to obtain the proper strip anneal.
  • the present invention provides a new and improved apparatus for continuous annealing of a metal strip using a vertical furnace as an accumulator which eliminates the need for additional expensive accumu­lators and their associated equipment, and provides a high quality uniform anneal using energy efficient operating principles.
  • the annealing apparatus comprises a strip joining station for connecting the trailing end of a section of lead strip from a lead coil to the leading end of a successive strip from a coil to form a continuous strip, input and output strip feed structures or rollers, a vertical furnace defining an annealing chamber, a controller regulating the rate of strip fed through the feed structures to establish a catenary loop of strip between the structures and within the furnace, and sensors communicating with the controller to process and regulate the respective rates of the feed structures for controlling the size of the loop so that the furnace is concurrently operated to anneal the strip and to function as an accumulator.
  • the apparatus includes a strip coil supply including structure to support a lead coil and a successive coil of strip metal. Strip is fed from the coil supply to the strip joining station.
  • the strip joining station includes a shear mechanism for trimming the free leading and trailing ends of respective strips to be connected, and a welder for welding the ends together to form the continuous strip.
  • a pre-heat station including a heating chamber having a strip inlet and outlet, a gas inlet for receiving exhaust gas from the annealing furnace to heat the chamber, and a gas outlet for releasing exhaust gases from the heating chamber to a recuperator or other heat reclaiming or exchanging device.
  • the recuperator assists in heating furnace combustion gas prior to return to the annealing furnace, and thus provides increased furnace efficiency and decreased energy expense.
  • the input and output strip feed structures or rollers are positioned on opposite sides of and near the top of the furnace annealing chamber.
  • the input structures are also positioned adjacent the heating chamber strip outlet, such that the input feed struc­tures receive and steer the strip to the annealing furnace upon exit from the heating chamber.
  • the strip is preferably fed through the feed structures and furnace between the structures in the form of a variable length catenary loop.
  • the furnace includes a strip inlet and outlet on a top portion of the furnace, an exhaust gas outlet releasing exhaust gas from the furnace to the heating chamber, sensors for sensing strip condition, and heat elements or burners activated by the controller for heating the chamber in response to sensor communications.
  • the controller regulates the rotation rates of the strip feed structures according to sensed strip condition communications received from the sensors.
  • the sensor communications received by the controller are processed and compared with a controller ideal anneal condition.
  • the con­troller then regulates the respective rates of the feed structures, and operates the heat elements to conform the sensed strip condition to that of the controller ideal anneal condition.
  • the output feed structures When the input feed structures are stopped for interconnecting the next successive strip with the continuous strip, the output feed structures continue movement of the strip and thereby deplete the loop within the furnace.
  • the size of the loop is thus controlled so that the furnace concurrently operates to anneal the strip and to function as an accumulator. Since the strip tension in the furnace is also reduced from that of prior catenary furnaces, the likelihood of strip breakage at annealing temperatures is greatly reduced with apparatus constructed in accordance with the preferred embodiment.
  • the depleted loop is replenished once the con­tinuous strip connection is completed by movement of the strip input feed structures to an overspeed condition.
  • the loop is also replenished when the output feed structure is stopped to accommodate strip sever­ance.
  • the controller and sensors are thus in constant communication regarding strip condition in order to regulate and conform the rate of input and output feed structure rotation and burner operation with the ideal anneal condition.
  • the output feed structure comprises water cooled rollers for quenching the strip upon exiting from the furnace outlet.
  • a post-­annealing station receives the strip from the output structures and includes a sensor, structure for further air quenching of the strip, and cleaning and drying structure for treating the strip.
  • a strip severance station is also provided where the continuously fed strip is separated to form discrete annealed strips.
  • a take-up or recoiling station including structure for coiling the separated annealed strip after it exits the furnace structure is also provided.
  • the sensed strip condition is communicated to the controller from sensors including width sensors, weight sensors, length sensors, temperature sensors and speed sensors.
  • coils are trans­ferred to the strip coil supply from a conventional rolling system and coiler via a heated conveyor so that a high coil temperature is maintained. By maintaining the high coil temperature added energy savings are also obtained.
  • FIG. 10 An apparatus for continuous annealing of strip metal constructed in accordance with the present invention is illustrated generally at reference character 10 in Figure 1 of the drawings.
  • the apparatus is shown on the plant floor, indicated at reference A, as comprising a pre-entry station 11, a strip supply 12, a strip joining station 14, a pre-heat station 15, a vertical furnace structure 16 defining an annealing chamber 18, input 20 and output 22 strip feeders, an apparatus controller 24, sensors 26, a post-annealing station 28, a strip severance station 30 where the strip is separated to form discrete annealed coils, and take-­up structure 32 for coiling an annealed strip.
  • the pre-entry station 11 referenced in Figure 1, receives coiled strips of metal directly from the rolling and coiling systems manufacturing the coiled strips, and comprises an enclosed and heated conveyor 40 for maintaining the strips at a temperature still elevated from roll and coil formation. From the pre-­entry station, the coils are transferred to the strip supply 12.
  • the strip supply includes an uncoiling mechanism 42 for receiving, supporting and uncoiling a lead strip 44 from a lead coil 46 on a first support 48.
  • a coil loading mechanism 49 is also included for transferring a successive coil 50 mounted on a second support 52 to the uncoiling mechanism. Once uncoiled, the strip is passed through a conventional bending and peeling mechanism 54 to the strip joining station.
  • the strip joining station 14 comprises a shear mechanism 56 for trimming free ends of the lead strip 44 and a strip from successive coil 50. Once trimmed, the strips move to a welder 58 which welds the free ends together to form a continuous strip 34 to be annealed. The continuous strip is next moved to the pre-heat station past a steering roller 60.
  • the pre-heat or pre-process­ing station 15 comprises a heat chamber 62 which is a non-fired chamber with a gas inlet 64 for receiving exhaust gas from the furnace 16 for heating the heat chamber 62, a gas outlet 66 for releasing said exhaust gas from the heat chamber to a recuperator (not illustrated), a sensor 68, and furnace input feed structure 20.
  • the input feed structure 20 comprises rollers 70a and 70b for feeding the strip to the furnace at a controlled rate es­tablished by a drive roller 70c.
  • the strip enters the heat chamber 62 past an inlet opening 72 and exits the chamber through an outlet 74.
  • a barrier mechanism 76 is provided at the inlet and outlet to contain the heat chamber and prevent the flow of contaminants into the chamber 62.
  • the recuperator which comprises a conventional heat exchanger or other heat transfer device, receives the exhaust gas exiting the chamber and uses it to assist in heating combustion gas entering the vertical furnace 16.
  • the heat chamber is lined on an interior surface 63 with firebrick which stores heat energy and re-radiates the heat to the strip.
  • the sensor 68 comprises a temperature sensor such as a pyrometer for measuring the temperature of the strip prior to entering the heat chamber and a tacho­ meter for sensing strip speed.
  • the temperature sensed by the sensor is communicated to the interconnected controller 24.
  • the furnace input feed rollers 70a and 70b feed the strip to the vertical furnace at a controlled rate also determined by the controller.
  • the vertical furnace structure 16 is defined by an annealing chamber 18 having an outer shell 77 of steel, interior side walls 78 insulated with fiber insulation having very low heat retention, a bottom portion 80 insulated with firebrick, and a top portion 82 also constructed of steel and lined with low heat retention fiber insulation.
  • the annealing chamber includes a strip inlet 84 and a strip outlet 86 in the top portion 82 of the furnace, and barriers 76 associated with the inlet and outlet of the type set forth with respect to the heat chamber. Exhaust gas from the annealing chamber is released to the interconnected heat chamber 62 via the inlet 64.
  • Burners or heating elements 88 shown in vertical cross-section in Figure 2, mounted in the furnace side walls for heating the chamber to the required annealing temperature, are activated by the controller in response to the communication of information from the sensors 26.
  • the dark burners indicate burners mounted on the near side wall 78, and the light burners indicate burners 88b mounted on the far side wall of the furnace.
  • the input strip feed structures 20 having rollers 70a and 70b, are rotated by a drive roller 70c at a rate controlled by the controller 24.
  • the output feed structures 22 comprises rollers 90a, 90b, and 90c.
  • a catenary loop 36 of the continuous strip 34 is extended between the input and output feed structures 20, 22, to provide accumulation of the strip within the furnace, The size of the loop is controlled by rotation of the respective input and output rollers.
  • Strip or loop position within the furnace is monitored by sensors 92 comprising photo cells intercon­nected with the controller for communicating loop position.
  • Strip temperature is sensed by pyrometer sensors 94, 96 positioned at the annealing chamber bottom 80, inlet 84 and outlet 86 so that the strip annealing temperature is monitored within the chamber and as the strip enters and exits the chamber.
  • the output feed structure rollers 90a, 90b, 90c comprise water cooled rollers for quenching the annealing strip as it emerges from the furnace to a lower temperature for preserving strip grain structure.
  • the apparatus controller 24 comprises a programmed computer having an ideal annealing model therein.
  • the computer is operatively interconnected with each of the sensors 26 for receiving sensed strip conditions from the pre-heat station 15, the annealing chamber 18 and the post annealing station 28, as well as the burners 88, and the feed structure.
  • Input conditions such as strip width, gauge and speed are also provided by sensors 26 located at the pre-heat station for calculat­ing the pounds of coil per hour processed through the annealing chamber.
  • the computer compares these inputs, together with sensed conditions received from the sensors to conditions in the programmed ideal annealing model, and computes the necessary levels of burner operation and strip speed through the apparatus in order to match the ideal model. Once the levels determined, the computer then makes appropriate adjustments to conform the sensed strip conditions with the ideal annealing model conditions.
  • the post-annealing station 28 includes the output feed structure 22 having water cooled rollers 90a, 90b, 90c, for removing the strip from the chamber and moving it through an air quenching section as indicated in the drawings, a steering roll 98, a pyrometer sensor 97 for sensing strip temperature after quenching, and a series of cleaning mechanisms, including a blast cleaner 99; a pickling bath 100 of sodium sulfate 100a having a bridle 101 therein for containing the strip, and an exhaust exit 100b with gases shown exiting at the arrow; a surface cleaner 102 having an exhaust exit 102a also with gases shown exiting at the arrow, brushes 103 and a dryer 104. Deflector rolls 106 are also included along the series of cleaner mechanisms.
  • the strip is separated to form discrete annealed coils by a shear mechanism 110, moved through pinch rolls 112, to the take-up structure 32 where the strip is recoiled in an annealed coil 114 by a recoiler mechanism.
  • the controller regulates the input feed structure 20 rotation so that strip input to the furnace is stopped.
  • the output feed structure continues to remove strip from the furnace, depleting the loop within the chamber through the phantom conditions shown in Figure 2.
  • the controller may turn off the lower burners to further conserve energy. If strip length is reduced beyond a minimum condition, the controller shuts the burners down for up to a two minute period.
  • the controller reactivates the burners and moves the input feed structure to an overspeed condition for rapidly feeding an amount of strip, calculated by the controller together with the tachometer and photo cell sensors, into the chamber until the depleted loop 36 is replen­ ished.
  • the furnace thus operates to concurrently operate as an annealing chamber and as an accumulator.
  • the apparatus controller 24 and sensors 26 are thus constantly communicating regarding strip speed, temperature and position in order to continuously communicate, regulate and conform the rate of input and output feed structure rotation, strip temperature and burner operation to the ideal anneal condition.

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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)
EP89306102A 1988-07-05 1989-06-15 Verfahren und Vorrichtung zum kontinuierlichen Glühen Withdrawn EP0350173A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US21496088A 1988-07-05 1988-07-05
US214960 1988-07-05

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EP0350173A1 true EP0350173A1 (de) 1990-01-10

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EP89306102A Withdrawn EP0350173A1 (de) 1988-07-05 1989-06-15 Verfahren und Vorrichtung zum kontinuierlichen Glühen

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EP (1) EP0350173A1 (de)
JP (1) JPH0261008A (de)
KR (1) KR900001867A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110343844A (zh) * 2019-07-01 2019-10-18 首钢智新迁安电磁材料有限公司 一种连续退火机组活套套量控制方法及装置
CN110989522A (zh) * 2019-12-06 2020-04-10 东北大学 一种面向多钢卷的连退生产过程工艺参数优化设定方法
EP3642372B1 (de) 2017-06-20 2021-05-26 SMS Group GmbH Verfahren zum betreiben eines glühofens
CN117625914A (zh) * 2023-11-30 2024-03-01 山东亨旺特导线缆有限公司 一种高性能铝合金导体生产装置及制备工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010106009A (ko) * 2000-05-20 2001-11-29 에릭 발리베 코일공급장치

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448835A (en) * 1945-01-30 1948-09-07 Carnegie Illinois Steel Corp Apparatus for continuously processing strips
US3152794A (en) * 1962-09-14 1964-10-13 Ind Ovens Inc Means for continuously treating strip
US4395021A (en) * 1982-02-08 1983-07-26 Nippon Steel Corporation Vertical continuous annealing furnace and its operating method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448835A (en) * 1945-01-30 1948-09-07 Carnegie Illinois Steel Corp Apparatus for continuously processing strips
US3152794A (en) * 1962-09-14 1964-10-13 Ind Ovens Inc Means for continuously treating strip
US4395021A (en) * 1982-02-08 1983-07-26 Nippon Steel Corporation Vertical continuous annealing furnace and its operating method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3642372B1 (de) 2017-06-20 2021-05-26 SMS Group GmbH Verfahren zum betreiben eines glühofens
CN110343844A (zh) * 2019-07-01 2019-10-18 首钢智新迁安电磁材料有限公司 一种连续退火机组活套套量控制方法及装置
CN110989522A (zh) * 2019-12-06 2020-04-10 东北大学 一种面向多钢卷的连退生产过程工艺参数优化设定方法
CN110989522B (zh) * 2019-12-06 2022-09-09 东北大学 一种面向多钢卷的连退生产过程工艺参数优化设定方法
CN117625914A (zh) * 2023-11-30 2024-03-01 山东亨旺特导线缆有限公司 一种高性能铝合金导体生产装置及制备工艺
CN117625914B (zh) * 2023-11-30 2024-05-28 山东亨旺特导线缆有限公司 一种高性能铝合金导体生产装置

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Publication number Publication date
KR900001867A (ko) 1990-02-27
JPH0261008A (ja) 1990-03-01

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