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US20120000213A1 - Method and apparatus for discharging a controlled amount of cryogen onto work surfaces in a cold roll mill - Google Patents

Method and apparatus for discharging a controlled amount of cryogen onto work surfaces in a cold roll mill Download PDF

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Publication number
US20120000213A1
US20120000213A1 US12/675,266 US67526608A US2012000213A1 US 20120000213 A1 US20120000213 A1 US 20120000213A1 US 67526608 A US67526608 A US 67526608A US 2012000213 A1 US2012000213 A1 US 2012000213A1
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United States
Prior art keywords
operating parameter
cryogen
roll
cold rolling
rolling process
Prior art date
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Abandoned
Application number
US12/675,266
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English (en)
Inventor
Minfa Lin
Michael Dennis Lanyi
Guido Plicht
Robert James Edwards
Harald Schillak
Detlef Bennewitz
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Air Products and Chemicals Inc
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Air Products and Chemicals Inc
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
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Priority to US12/675,266 priority Critical patent/US20120000213A1/en
Assigned to AIR PRODUCTS AND CHEMICALS, INC. reassignment AIR PRODUCTS AND CHEMICALS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BENNEWITZ, DETLEF, EDWARDS, ROBERT JAMES, LIN, MINFA, PLICHT, GUIDO, SCHILLAK, HARALD, LANYI, MICHAEL DENNIS
Publication of US20120000213A1 publication Critical patent/US20120000213A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/022—Cleaning travelling work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • B08B5/023—Cleaning travelling work
    • B08B5/026—Cleaning moving webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature

Definitions

  • the present invention is directed to a method and apparatus for controlling the amount of cryogenic coolant applied to the work rolls, roll gap, or rolled product in a mill stand during a cold rolling operation.
  • the amount of cryogen is adjusted in response to a sensor output signal indicative of any one or combination of measured operating parameters including mill stand parameters, rolled product parameters, ambient atmosphere conditions and cryogen parameters.
  • Cold rolling is a process used to produce metallic sheet, strip or profiles with specific mechanical properties such as surface finish and specific dimensions within certain dimensional tolerances.
  • the sheet or strip passes between two counter-rotating work rolls adjusted at a predetermined roll gap setting so that the rolled product is plastically deformed to a required thickness defined by the set roll gap.
  • Cold rolling generates heat in response to the forces required to deform the strip and in response to friction between the work rolls and the strip.
  • the generated heat accumulates in both the work rolls and, if not controlled, may result in temperatures above acceptable cold rolling levels.
  • the acceptable temperatures can vary based on type of metal, strip dimensions, cold rolling parameters and surface finish.
  • Past attempts to prevent excessive heat build-up in the mill stand and to reduce friction between the work rolls and the strip include flooding the work rolls and product with coolants and lubricants such as oil, water, or emulsions.
  • coolants and lubricants such as oil, water, or emulsions.
  • many of the liquids have negative effects if not quickly removed from the finished product surface.
  • the metal being cold-rolled is steel, water or aqueous emulsion remaining on the strip can cause oxidation, or rust.
  • removing oily residue increases production cost and creates environmental problems.
  • dry rolling is sometimes used to avoid having to deal with the above-mentioned problems. Rolling dry is also sometimes chosen because it will impart a brighter (shinier) finish onto the rolled strip.
  • inert gas at a lower temperature than the temperature of the rolled product passing through the roll gap.
  • the inert gas may be in either gaseous or liquid form, i.e. a cryogen, or mixed-phase.
  • the lower temperature inert gas provides a cooling alternative to oil, water, or emulsion coolants. Since there is no liquid residue left on the strip when inert gas is used as a coolant in a rolling operation, corrosion problems associated with residual water or emulsion remaining on the strip are prevented.
  • use of inert gas provides a cleaning effect for the working rolls and strip surface which, among other benefits, extends the service life of working rolls.
  • cryogenic coolant In applications where a cryogenic coolant is used, overcooling and undercooling are significant issues because of the larger temperature differential between the rolled product and the cryogen. There have been efforts to adjust cryogenic coolant flow rates based on temperature measurements from the roll surface. The temperature measurements are typically taken, however, using optical pyrometers located on the strip entry side of the roll stand, and the flow of cryogenic is controlled to keep the mill temperature within a specified range.
  • thermocouples for the optical pyrometers are not practical. Measuring work roll surface temperature with contact sensors is difficult to implement and such contact measurements are prone to be unreliable.
  • Use of internal thermocouples to measure work roll surface temperature has been suggested, but would also be unreliable and difficult to implement. For example, positioning internal thermocouples near the work roll surface is complex from an engineering viewpoint, difficult to achieve, and expensive. Installation of such thermocouples could be simplified by positioning them deeper within the roll, i.e. positioned at a greater distance from the roll surface. However, deeply imbedded thermocouples will lead to an impaired response that generates an inadequate signal for good cooling control.
  • cryogen cooling control apparatus disclosed in the prior art is impractical and not capable of delivering an accurate, controlled amount of cryogen to a cold roll mill stand. Accordingly, there is a widely-felt need in the industry to provide a cryogen delivery system that provides improved temperature measurement in combination with improved accuracy in the mass flow rate of cryogen delivered to a cold roll mill stand.
  • the invention comprises a method including measuring at least one operating parameter of a cold rolling process, each of the at least one operating parameter being correlated to the thermal conditions of an element of the cold rolling process, and controlling operation of a cryogenic cooling device based at least in part on measurements of the at least one operating parameter.
  • the invention comprises an apparatus for use with a cold rolling process having at least one sensor, each of the at least one sensors being adapted to measure an operating parameter of the cold rolling process, the operating parameter being correlated to the thermal conditions of an element of the cold rolling process.
  • the apparatus also includes a cryogenic cooling device having an adjustable discharge intensity, and a controller that is configured to receive output signals received from the at least one sensor and is programmed to adjust the discharge intensity of the cryogenic cooling device based at least on part on the output signals received from the at least one sensor.
  • the invention comprises a method comprising measuring a load force acting on a roll of a cold rolling process and controlling operation of a cryogenic cooling device based at least in part on measurements of the load force.
  • FIGS. 1A-1D show various sensors positioned to measure mill stand parameters
  • FIG. 1E shows a combination of at least two different sensors positioned to measure mill stand parameters
  • FIGS. 2A-2D show various sensors positioned to measure rolled product parameters
  • FIG. 2E shows a combination of at least two different sensors positioned to measure rolled product parameters
  • FIGS. 3A-3B show various sensors positioned to measure cryogen parameters
  • FIG. 3C shows a combination of at least two different sensors positioned to measure cryogen parameters
  • FIG. 4A shows sensors positioned to measure mill stand parameters in combination with sensors positioned to measure rolled product parameters
  • FIG. 4B shows a combination of sensors positioned to measure mill stand parameters, sensors positioned to measure rolled product parameters, and sensors positioned to measure cryogen parameters.
  • cryogenic coolants namely liquid nitrogen or other suitable liquefied or solid gas
  • problems associated with earlier coolants such as water, oil, and emulsions.
  • cryogens are also problematic in that it is essential to maintain accurate control over the amount of cryogen delivered to the work roll surfaces and rolled product surfaces (hereinafter referred to as working surfaces), so that under-cooling or over-cooling is avoided.
  • working surfaces work roll surfaces and rolled product surfaces
  • water-based and oily coolants were simply flooded into the region of the roll gap and the over-supply of coolant provided a self-regulating, steady-state thermal condition in the work surfaces, producing desired properties in the final rolled product.
  • the coolant is a cryogen
  • excess amounts of cryogen create large vapor clouds that obscure visibility in the mill stand, and possible oxygen deficient atmospheres within the mill operating area.
  • over-cooling adversely affects finished product quality due to a reduction in the plasticity of the rolled product. Over-cooling also produces excessive amounts of condensation on the sheet or strip surfaces creating surface defects or corrosion problems. Therefore, accurate control over the amount of cryogen delivered to the mill stand is essential to avoid the above problems.
  • the present invention utilizes operating parameters other than direct temperature measurements of the surface of the rolled material, individually and/or in combination, to determine desired cryogen flow rates. Many of the measured parameters are correlated to the temperature of the rolled material. It should be understood that parameters that are correlated to the temperature of the rolled material exclude direct measurement of the temperature of the rolled material.
  • cryogenic cooling device is intended to mean any type of apparatus or device which is designed to discharge or spray a cryogenic fluid (either in liquid, mixed-phase, or gaseous form).
  • cryogenic cooling devices include, but are not limited to, cryogenic spray bars, individual cryogenic spray nozzles, and devices containing arrays of cryogenic spray nozzles.
  • cryogen delivery systems 10 a for a mill stand 1 are shown.
  • Each cryogen delivery system 10 a comprises a different sensor positioned at a suitable location for measuring operating parameters for the cold rolling process.
  • mill stand 1 includes a pair of opposed work rolls 2 a and 2 b set to a predetermined roll gap 3 , preferable but not necessary backup rolls 4 a and 4 b that maintain a constant distributed roll force on the work rolls and rolled product 5 and a strip entry side 6 that receives incoming product.
  • the cryogen delivery system 10 a includes a storage tank 11 that contains a supply of cryogen such as liquid nitrogen or other liquefied gas at a temperature of ⁇ 70° C. or lower.
  • the pipe or conduit 12 is attached to storage tank 11 and conduit 12 includes a first remote end 13 a and a second remote end 13 b proximate the strip entry side 6 of the mill stand.
  • Each remote end 13 a and 13 b includes a cryogenic cooling device 14 a and 14 b that extends across the width of the mill stand or strip at a location suitable for disbursing a controlled amount of cryogen onto the work surfaces of mill stand 1 .
  • each remote end 13 a and 13 b is placed at the strip outlet of the roll gap 3 to improve cleaning effects.
  • cryogenic cooling devices 14 a and 14 b any device suitable for discharging a controlled amount of cryogen onto the work surfaces may be used.
  • a cryogenic spray bar having an elongated discharge slot that extends across the mill stand width or strip width or a device having an array of individually controlled nozzles could be used.
  • a mill screw 15 that adjusts the mill gap includes a load cell 16 a .
  • the mill screw 15 is operated to produce a mill gap required to produce a metallic sheet or strip having predetermined mechanical properties, surface finish, and dimensions, and load cell 16 a generates continuous output signals indicative of the roll force.
  • Load cell 16 a is connected to a controller 17 , for example, a programmable logic controller (PLC) that operates a control valve 18 fitted within conduit 12 at a location between storage tank 11 and the cryogenic cooling devices 14 a and 14 b .
  • PLC programmable logic controller
  • a load cell 16 b may be positioned to measure roll force on a bearing 19 that supports the lower backup roll 4 b . Similar to load cell 16 a , load cell 16 b is connected to controller 17 , which records the incoming stream of data from load cell 16 b.
  • cryogen delivery system 10 a may include more than one load cell, for example, but not limited to, load cells 16 a and 16 b whereby controller 17 is programmed to provide averaged numeric values based on a continuous incoming stream of data from multiple load cell measurements.
  • the roll force measurements are used as feedback signals to accurately regulate the flow of cryogen within a desired mass flow range or at a desired mass flow set point. Accordingly, the discharge intensity of cryogen dispersed onto the work surfaces, or into the roll gap, is controlled in response to the numeric values from the load cell measurements. For example, when the numeric values indicate that the measured roll force is about 15% higher than the roll force absent any cryogen, controller 17 transmits a signal that operates control valve 18 to reduce the mass flow rate of cryogen sprayed or dispersed onto the work surfaces or roll gap until the numeric values return to the preferred range. The adjusted mass flow of cryogen controls the roll force, and thereby regulates rolling temperatures in the mill stand.
  • a throttling gas system could be used to control the mass flow of cryogen.
  • An example of a throttling gas system is provided in U.S. patent application Ser. No. 11/846,116, filed Aug. 28, 2007, which is incorporated herein by reference as if fully set forth.
  • the discharge intensity of the cooling device is primary a function of the flow rate of cryogen through the cryogenic cooling device.
  • the discharge intensity of the cooling device is a function of both the flow rate of cryogen and throttling gas through the cryogenic cooling device.
  • the cryogen delivery system 10 a is adapted to measure stress conditions on the work roll surface to control the flow of cryogen to the mill stand 1 .
  • Cryogenic spray quenching is known to give the effect of causing residual compressive stress conditions on the quenched surfaces.
  • one or more X-ray analyzers 20 a and 20 b capable of determining the stress conditions in the surface of the work rolls 2 a , 2 b , are used to indicate the amount of stress occurring during the cold rolling operation.
  • Output signals indicative of residual stress are generated by analyzers 20 a and 20 b , and the signals are received as a continuous stream of data by controller 17 .
  • controller 17 uses the numeric values from the incoming stream of data from the analyzers 20 a and 20 b and operates one or more control valves 18 and 18 a in response to a set point value that correlates with a targeted measured stress which, in turn, correlates with desired temperature conditions in mill stand 1 so that the mass flow of liquid nitrogen from storage tank 11 to cryogenic cooling devices 14 a and 14 b is regulated to disperse a controlled amount of cryogen onto the work surfaces.
  • control valves 18 and 18 a are provided. Each control valve communicates with controller 17 so that the cryogen spray from cryogenic cooling devices 14 a and 14 b can be individually regulated.
  • the numeric values can reflect an average of the incoming stream of multiple stress measurements (from multiple x-ray analyzers) to improve accuracy.
  • At least one sensor 21 a and/or 21 b is provided in the cryogen delivery system 10 a to measure electrical resistance in the work rolls 2 a and 2 b .
  • Sensors 21 a and/or 21 b can be Ohm meters or any other suitable device known in the art for measuring electrical resistance, and similar to before, the sensors 21 a and 21 b generate output signals indicative of electrical resistance of the work rolls.
  • Controller 17 receives the incoming stream of data and operates at least one control valve 18 in response to a set point value so that cryogenic cooling devices 14 a and 14 b disperse a desired controlled amount of cryogen from storage tank 11 onto the work surfaces.
  • the numeric values of the work roll resistance correlate with electrical resistance conditions on the roll which, in turn, correlate with the temperature conditions in mill stand 1 , and the numeric values can either comprise an average of the data transmitted from sensors 21 a and 21 b or a value based on a single sensor, either 21 a or 21 b.
  • At least one sensor 22 a and/or 22 b is provided in the cryogen delivery system 10 a to measure mill speed, for example, the speed of the rotating work rolls 2 a and 2 b and/or the traveling speed of the rolled product.
  • Sensors 22 a and/or 22 b may comprise tachometers or any other suitable measuring device known in the art, and similar to before, the sensors 22 a and 22 b generate output signals indicative of the mill speed.
  • Controller 17 receives the incoming stream of data, and in response to a set point value, operate control valves 18 and 18 a so that cryogenic cooling devices 14 a and 14 b disperse a desired controlled amount of cryogen from storage tank 11 onto the work surfaces.
  • cryogen flow from storage tank 11 to cryogenic cooling devices 14 a and 14 b can be ratioed, or proportioned/controlled to mill speed in either a directly linear, or even a more complex, empirically-derived function.
  • the numeric values can either comprise an averaged or individual value based on the data transmitted from multiple sensors, such as sensors 22 a and 22 b.
  • cryogen delivery system 10 a to improve accuracy in rolling temperature control.
  • the delivery system includes both X-ray analyzers 20 a and 20 b to measure residual roll stress and sensors 22 a and 22 b to measure mill speed.
  • the output signals generated by the different sensors are transmitted to controller 17 which is programmed to combine the incoming stream of data into calculated numeric values.
  • the controller 17 transmits a signal that operates at least one control valve 18 and/or 18 a and a controlled mass flow of cryogen is delivered from storage tank to cryogenic cooling devices 14 a and 14 b and dispersed onto the work surfaces of mill stand 1 .
  • mill stand 1 includes work rolls 2 a and 2 b , a roll gap 3 , preferable but not necessary backup rolls 4 a and 4 b , and a strip entry side 6 for receiving the rolled product 5 .
  • the cryogen delivery system 10 b is similar to the cryogen stand delivery system 10 a , and includes storage tank 11 containing a cryogen such as liquid nitrogen or the like, conduit 12 extending to remote ends 13 a and 13 b proximate the strip entry side 6 , and cryogenic cooling devices 14 a and 14 b .
  • the remote ends 13 a and 13 b are on the strip outlet to improve cleaning effects.
  • cryogen delivery system 10 b includes at least one non-optical sensor that generates an output signal indicative of temperature in the rolled metallic sheet or strip.
  • the sensors are thermocouples 23 a and 23 b , however, any suitable, non-optical temperature measuring device known in the art may be used without departing from the scope of the present invention.
  • Controller 17 receives the continuous incoming stream of data from thermocouples 23 a and 23 b , and is programmed to respond a set point value by transmitting a signal that operates at least one control valve 18 so that cryogenic cooling devices 14 a and 14 b receive and disperse a controlled mass flow of cryogen from storage tank 11 onto the work surfaces in mill stand 1 .
  • the cryogen delivery system 10 b measures stress conditions in the surface of the rolled metallic sheet or rolled product 5 to provide a desired mass flow of cryogen to mill stand 1 .
  • cryogenic spray quenching is known to give the effect of causing residual compressive stress conditions on the quenched surfaces. Therefore, one or more X-ray analyzers 24 a and 24 b , capable of determining the stress conditions in the rolled product surface, are positioned on the exit side 6 a of the mill stand to indicate the amount of stress that is occurring in rolled product 5 during cold rolling.
  • Output signals indicative of residual stress in the rolled product are generated by analyzers 24 a and 24 b , and the signals are transmitted as a continuous stream of data to controller 17 .
  • controller 17 uses the numeric values from the incoming stream of data to operate one or more control valves 18 and 18 a in response to a set point value that correlates with temperature conditions in mill stand 1 so that the mass flow of liquid nitrogen from storage tank 11 to cryogenic cooling devices 14 a and 14 b is accurately regulated to disperse a controlled cryogen spray or flow onto the work surfaces.
  • the cryogen delivery system 10 b comprises sensors that are capable of measuring strip profile such as shape and flatness.
  • the sensors comprise X-ray shape gauges 25 a and 25 b .
  • alternate strip profile sensors could include, but are not limited to, tomography gauges, radioisotope traversing gauges, or shape meters where the strip is pulled at an angle over a segmented roll and the segments include transducers capable of measuring the radial forces exerted on them to provide a signal related to strip shape.
  • a wide variety of different devices are available for measuring strip profile and generating output signals that can be used to regulate the mass flow of cryogen from storage tank 11 to cryogenic cooling devices 14 a and 14 b .
  • gauges 25 a and 25 b generate output signals indicative of strip profile and transmit the signals to controller 17 where the controller 17 calculates numeric values from the incoming stream of data.
  • the controller 17 transmits a signal that operates at least one control valve 18 so that a desired controlled mass flow of liquid nitrogen from storage tank 11 is transferred to cryogenic cooling devices 14 a and 14 b .
  • the controlled amount of cryogen dispersed onto the work surfaces minimizes shape variations in the rolled product and the relatively constant shape controls mill stand temperature.
  • the cryogen delivery system 10 b includes at least one surface roughness gauge 26 a and/or 26 b , for example, a contact gauge or laser gauge, to measure roughness or texture (Ra) along the rolled product 5 surface.
  • the gauges 26 a and 26 b generate output signals indicative of the Ra value along the surface of the rolled product 5 .
  • a video scanning system such as surface inspection systems offered by Parsytec AG of Aachen, Germany, could be used to determine roughness.
  • the roughness measurements correlate with thermal conditions and cleanliness of the working rolls existing in a mill stand 1 , and controller 17 receives the incoming stream of data whereby the controller 17 calculates the numeric values, and in response to reaching a set point value, the controller 17 operates control valves 18 and 18 a so that cryogenic cooling devices 14 a and 14 b receive a controlled mass flow of cryogen from storage tank 11 that is dispersed onto the work surfaces in mill stand 1 and keeps the working roll surface clean.
  • stress analyzers 24 a and/or 24 b first shown in FIG. 2B are combined with the roughness gauges 26 a and 26 b of FIG. 2D to provided cryogen delivery system 10 b having an arrangement of different non-optical sensors to determine different operating parameters in the rolled product 5 .
  • the different sensors generate their respective output signals that are combined in controller 17 and the controller 17 is programmed to calculate numeric values based on the combined stream of incoming data.
  • controller 17 transmits a signal that operates control valves 18 and 18 a so that a desired mass flow of cryogen is transmitted from storage tank 11 to cryogenic cooling devices 14 a and 14 b where the cryogen is dispersed onto the work surfaces in mill stand 1 .
  • each cryogen delivery system embodiment 10 c includes a mill stand 1 having a pair of opposed work rolls 2 a and 2 b , a roll gap 3 set to produce a desired cold rolled metallic sheet or rolled product 5 , backup rolls 4 a and 4 b , and a strip entry side 6 .
  • the cryogen delivery system 10 c includes at least one sensor 27 a and/or 27 b , for example, but not limited to, a thermocouple for measuring condensation 28 in the atmosphere, the condensation created from vapor cooling of humidity proximate the working surfaces receiving cryogen coolant.
  • Sensors 27 a and 27 b generate output signals indicative of the measured condensate, and controller 17 receives the incoming stream of data.
  • controller 17 transmits a signal that operates at least one control valve 18 so that cryogenic cooling devices 14 a and 14 b receive a controlled mass flow of cryogen from storage tank 11 that is dispersed onto the work surfaces in mill stand 1 .
  • the cryogen delivery system 10 c includes at least one cryogenic temperature sensor 29 fitted within conduit 12 to measure temperature of the cryogen delivered to cryogenic cooling devices 14 a and 14 b .
  • Controller 17 receives the stream of incoming temperature measurements. When the temperature values correspond with a set point value rolling temperature in the mill stand, controller 17 transmits a signal that operates at least one control valve 18 so that cryogenic cooling devices 14 a and 14 b disperse a controlled amount of cryogen onto the work surfaces in mill stand 1 .
  • sensors 27 a and 27 b that monitor the condensation 28 are combined with the cryogen temperature sensor 29 to provided cryogen delivery system 10 c having an arrangement of different sensors to determine different operating parameters associated with the cryogen.
  • the different sensors generate their respective output signals that are combined in controller 17 , and the controller 17 is programmed to calculate numeric values based on the combined stream of incoming data.
  • controller 17 transmits a signal that operates at least one control valve 18 so that a desired mass flow of cryogen is transmitted from storage tank 11 to cryogenic cooling devices 14 a and 14 b where the cryogen is dispersed onto the work surfaces in mill stand 1 .
  • FIG. 4A shows a cryogen delivery system 10 d having sensors for measuring mill stand parameters in combination with sensors for measuring rolled product parameters.
  • delivery system 10 d includes one or more remotely mounted X-ray analyzers 20 a and 20 b as disclosed in FIG. 1B , and at least one surface roughness gauge 26 a and/or 26 b as disclosed in FIG. 2D .
  • any non-optical sensors capable of measuring mill stand parameters and rolled product parameters can be combined in delivery system 10 d without departing from the scope of this invention.
  • the different sensors generate their respective output signals that are combined in controller 17 , and the controller 17 is programmed to calculate numeric values from the different streams of incoming data.
  • controller 17 transmits a signal that operates control valves 18 and 18 a so that a controlled mass flow of cryogen is transmitted from storage tank 11 to cryogenic cooling devices 14 a and 14 b where an accurate amount of cryogen is dispersed onto the work surfaces in mill stand 1 .
  • FIG. 4B shows a cryogen delivery system 10 e having sensors for measuring mill stand parameters in combination with sensors for measuring rolled product parameters, and sensors for measuring cryogen parameters.
  • delivery system 10 e includes one or more remotely mounted X-ray analyzers 20 a and 20 b , as disclosed in FIG. 1B , at least one surface roughness gauge 26 a and/or 26 b as disclosed in FIG. 2D , and at least one cryogenic temperature sensor 29 a , 29 b as disclosed in FIG. 3B .
  • any non-optical sensors capable of measuring mill stand parameters, rolled product parameters, and cryogen parameters can be combined in delivery system 10 e without departing from the scope of this invention.
  • controller 17 The different sensors generate their respective output signals that are combined in controller 17 and the controller 17 is programmed to calculate numeric values from the different streams of incoming data.
  • controller 17 transmits a signal that operates control valves 18 and 18 a so that a desired mass flow of cryogen is transmitted from storage tank 11 to cryogenic cooling devices 14 a and 14 b where the cryogen is dispersed onto the work surfaces in mill stand 1 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Temperature (AREA)
  • Control Of Metal Rolling (AREA)
US12/675,266 2007-08-28 2008-08-27 Method and apparatus for discharging a controlled amount of cryogen onto work surfaces in a cold roll mill Abandoned US20120000213A1 (en)

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US96847907P 2007-08-28 2007-08-28
US12/675,266 US20120000213A1 (en) 2007-08-28 2008-08-27 Method and apparatus for discharging a controlled amount of cryogen onto work surfaces in a cold roll mill
PCT/US2008/074451 WO2009029659A1 (en) 2007-08-28 2008-08-27 Discharging cryogen onto work surfaces in a cold roll mill

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CN (1) CN101842172A (pt)
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US20160339493A1 (en) * 2014-01-29 2016-11-24 Jfe Steel Corporation Cold rolling facility and cold rolling method
US20170355002A1 (en) * 2015-02-04 2017-12-14 Hydro Aluminium Rolled Products Gmbh Method and Apparatus for Roll-Embossing a Strip
CN108247933A (zh) * 2018-01-30 2018-07-06 霸州市金昌环保材料有限公司 一种粉末涂料压片机压滚防粘连装置
CN109213065A (zh) * 2018-09-27 2019-01-15 合肥通用机械研究院有限公司 一种基于plc控制的水冷冷水机组测试系统及方法

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