EP0080932A1 - Verfahren und Vorrichtung zum gesteuerten Abkühlen von Blech - Google Patents

Verfahren und Vorrichtung zum gesteuerten Abkühlen von Blech Download PDF

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Publication number
EP0080932A1
EP0080932A1 EP82402134A EP82402134A EP0080932A1 EP 0080932 A1 EP0080932 A1 EP 0080932A1 EP 82402134 A EP82402134 A EP 82402134A EP 82402134 A EP82402134 A EP 82402134A EP 0080932 A1 EP0080932 A1 EP 0080932A1
Authority
EP
European Patent Office
Prior art keywords
cooling
temperature
theoretical
fluid
cooling fluid
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
EP82402134A
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English (en)
French (fr)
Other versions
EP0080932B1 (de
Inventor
Stéphane Viannay
Jack Sebbah
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.)
USINOR SA
Original Assignee
USINOR SA
Union Siderurgique du Nord et de lEst de France SA USINOR
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.)
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Publication date
Application filed by USINOR SA, Union Siderurgique du Nord et de lEst de France SA USINOR filed Critical USINOR SA
Publication of EP0080932A1 publication Critical patent/EP0080932A1/de
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Publication of EP0080932B1 publication Critical patent/EP0080932B1/de
Expired 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • 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
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates

Definitions

  • the present invention relates to a process for carrying out the controlled cooling of sheets in order to obtain a perfectly defined crystalline structure of the metal composing it.
  • each surface element of the metal is in contact, inside the enclosure, with a mass of fluid regularly renewed.
  • the corresponding heat flux exchanged between the plate and the water is higher the higher the flow speed of the water; it is possible thanks to this process to extract a heat flux of the order of 3 ⁇ 10 6 W / m 2 .
  • This value corresponds to the core cooling rate of 30 ° C / s of a 30 mm thick plate.
  • the cooling rates achievable according to the process described in the aforementioned patent application appear to be entirely compatible for carrying out, for example, the martensitic quenching of a steel sheet at manganese carbon containing about 0.17% carbon and 1/4% manganese, with no other alloy element. It goes without saying that the application of this same treatment to steels containing small amounts of additions, for example, molybdenum, nickel or boron whose presence has the effect of increasing the quenchability, will also produce a structure martensitic.
  • the process defined in the aforementioned patent application does not make it possible to directly obtain the desired final structure of a metal, for example a steel of given composition.
  • the cooling operation generally results in the martensitic quenching of the metal and an tempering operation, characterized for steel by maintaining a suitable duration at a temperature below 710 ° C., must follow the operation of cooling.
  • studies relating to cooling transformations show that the cooling rate determines the structure of a steel of given composition.
  • Certain phases, in particular bainite, or mixture of phases, bainite and perlite with very fine grains, characterized by good mechanical properties of toughness and ductility, can be sought in the case of suitable grades of steel.
  • the object of the invention is therefore to provide a method and a cooling machine of the aforementioned type, making it possible to adjust and control the cooling rate of the sheet metal plates according to values determined as a function of the desired structures.
  • the subject of the invention is a method for controlling the cooling of a sheet in order to give it a predetermined crystal structure, according to which the sheet to be cooled is passed through an enclosure containing a mass of cooling fluid. regularly renewed, characterized in that the flow rate of the cooling fluid is controlled as a function of the temperature of arrival of this fluid, according to the thickness of the sheet to be cooled and the desired cooling rate.
  • the invention also relates to an installation for implementing the method defined above, said installation comprising a machine composed of an enclosure comprising means for circulating a cooling fluid which moves roughly parallel to the sheet metal, a cooling tank, means for injecting the cooling fluid contained in the tank inside said enclosure and means for discharging the cooling fluid after it has passed through the cooling enclosure, characterized in that it comprises means for controlling the flow of cooling fluid inside the enclosure as a function of the temperature of the cooling fluid.
  • the invention comprises means for regulating the temperature of the cooling fluid introduced into the enclosure.
  • the invention comprises means for regulating the pressure of the fluid inside the enclosure.
  • the installation shown in FIG. 1 comprises a cooling machine 1, a cooling tank 2, as well as a control and regulation device 3.
  • the cooling machine 1 is of the general type described in patent application n ° 2 223 096.
  • This machine consists of a series of support and guide rollers 4a, 4b to 8 a, 8 b.
  • the essential elements of the machine arranged symmetrically on either side of the mean plane of the sheet will be designated by the same reference numerals assigned with index a for the upper elements and b for the lower elements.
  • the machine comprises a metal envelope or enclosure 9 which extends between the guide rollers at 10 a , 10 b , and surrounds these rollers at 11 a , 11 b .
  • the flat walls 10 a , 10 b are approximately parallel and are separated by an interval greater than the thickness of the sheet, so as to delimit with this ab last two chambers or channels 12, 12 of thickness c.
  • Water circulation means comprise at least one supply duct 13 a , 13 b , 14 a , 14 b extending for example over the entire length of the rollers 5 a , 5 b , 7 a , 7 b and at minus one exhaust duct 15 a , 15 b , 16 a , 16 b , 17 a , 17 b also extending over the entire length of the rollers 4 a , 4 b , 6 a , 6 b and 8 a , 8 b .
  • the cooling tank 2 contains the cooling water; on its flanks are provided orifices 18, 19 to allow the exit of the cooling water intended for the machine 1 and water inlet orifices 20, 21 for recovering the water coming back from the cooling machine.
  • the orifices 18 and 19 of water outlet of the tray 2 are connected to the supply conduits 13a, 13b, 14a, 14b of the machine through conduits 23a, 23b through feed pumps ab 24 a , 24.
  • the water inlet orifices 20, 21 of the tank 2 are connected to the evacuation conduits 15 a , 15 b , 16 a , 16 b , 17 a , 17 b by conduits 25 a , 25 b through solenoid valves 26 a , 26 b .
  • a solenoid valve 27 mounted on line 28 ensures the supply of cold water to the tank.
  • the command and control device 3 essentially consists of a computer which can be of the digital, analog or hybrid type, the latter type being suitable for carrying out processing on both digital and analog quantities.
  • the control and regulation device 3 shown is of the hybrid type, it ensures the control and regulation of the flow rate of the pumps 24 a , 24 b and of the solenoid valves 26 a , 26 b and 27. It is connected by its inputs I 1 , 2 to a display table 29 of the set values R relating to the desired cooling speed and e relating to the thickness of the sheet entering the cooling machine.
  • the setpoints R and e are transmitted in binary coded form to the inputs I 1 and I 2 of the device 3.
  • the input I 3 is connected to an atmospheric pressure sensor P o .
  • the outputs I 4 and I 5 transfer the control commands to the pumps 24 a and 24 b .
  • the input I 6 receives, from a thermometric probe 32 disposed inside the tank 2.1a value of the temperature of the coolant. This temperature value is received in the form of an analog signal and in the form of a binary word of several bits.
  • the outputs I 7 to I 9 provide the respective commands for the solenoid valves 27, 26 b and 26 a .
  • the input I 10 receives the value of the relative pressure P of the water at the input of enclosure 9 of the machine and transmitted by a pressure sensor 33.
  • This device comprises a member 34 for calculating the value of the heat flow ⁇ exchanged between the sheet T and the cooling water, a member 35 for calculating the speed of the cooling fluid necessary to cool the sheet under the desired conditions , a member 36 for controlling the flow rate of the pumps 24a and 24b, a member 37 for regulating the water temperature in the tank 2 and a member 38 for regulating the pressure inside the enclosure 9 cooling.
  • the member 34 is constituted by a programmable read only memory which contains a table A giving the values of the heat flux ⁇ corresponding to different set values R and e.
  • This table A can be determined from a theoretical calculation taking into account the thickness c of the cooling water sheet circulating above and below the sheet to be cooled, and the boundary thermal conditions, in particular the heat flow exchanged on the surface of the sheet. These calculations involving the heat equations, lead to complicated formulas and it is preferable to build table A directly from tests carried out on several sheet thicknesses and for different cooling rates.
  • the member 35 is also constituted by a programmable read only memory which contains a table A 2 giving the values of the cooling rate corresponding to the different values of thermal flux stored in the memory of the member 34 and to different temperature values ⁇ of cooling water.
  • This table A 2 is determined from the relation which links the heat flow Center exchanged, to the speed of flow of the cooling water and which is given by the formula: where ⁇ ( ⁇ ) is a coefficient which only depends on the temperature of the cooling water.
  • the member 36 is also constituted by a programmable read only memory which contains in memory a table A 3 giving the values of the flow rate of the pumps as a function of the values of the speed of the cooling water read in the memory of the member 35.
  • the member 35 also contains a digital-analog converter, not shown, connected to the output of its memory, necessary for delivering the analog signals for controlling the pumps 24a and 24b.
  • the memory of the member 34 is connected by its two addressing inputs to the inputs 1 and I 2 of the device 3 and by its output, on the one hand, to an addressing input of the memory of the member 35 and , on the other hand, at the input of a multiplication circuit 39 located in the regulating member 37.
  • the memory of the member 35 is connected on its second addressing input to the input I 6 of the device 3 receiving the binary word transmitted by the temperature probe 32.
  • the output of the member 35 is connected to the addressing input of the memory of the member 36 and the output of the member 36 is connected to the outputs I 4 and I 5 of the computer 3.
  • the regulating member 37 is constituted by the multiplication circuit by a constant q, potentiometers 40, 41 and 42 used respectively for the display of a constant p and the ranges + ⁇ and - ⁇ for regulating the temperature of the water contained in the tank 2. It also consists of summing circuits 43 and 44, a subtraction circuit 45, comparators 46 and 47 and a member 50 for controlling the solenoid valve of water supply 27.
  • the constants p and q are defined from the characteristics of the installation by the following formulas: and where ⁇ o represents the minimum temperature of industrial water used as a cooling fluid.
  • the temperature of the cooling water must naturally be between these two values.
  • ⁇ M and ⁇ m are determined from formula (I) for the respective values of ⁇ o and ⁇ c and for values V of the speed of the water blade corresponding, knowing that the speed V of the water blade water must be greater than a critical speed V c for the coolant to fill the enclosure.
  • This critical speed corresponds to a dynamic pressure, expressed in water height, equal to the thickness of the tunnel.
  • the circuit 39 for multiplication by a constant is constituted in a known manner by a digital / analog converter composed of a network of resistance cells (R, 2R) in ⁇ whose supply voltage is varied as a function of the value of the constant q.
  • the summing circuit 43 is connected by an input to the output of the circuit 39 and by its other input to the cursor of the potentiometer 40.
  • the summing circuit 44 is connected by an input to the output of the circuit 43 and by its other input to the cursor of the potentiometer 41.
  • the subtraction circuit 45 is connected by an input to the output of the cricuit 43 and by its other input to the cursor of potentiometer 42.
  • the comparator 46 has two inputs, one is connected to the input terminal I 6 of the device 3 to receive the analog signal transmitted by the temperature probe 32 and the other is connected to the output of the circuit 44.
  • the comparator 47 also has two inputs, one is connected to the input terminal 1 of the device 30 to receive the analog signal transmitted by the thermometric probe 32, the other is connected to the output of the circuit 45.
  • the outputs of the comparators 46 and 47 are connected to two respective inputs of the member 50.
  • the regulating member 38 consists of the potentiometer 51, the summing circuit 52 and the comparator 53.
  • the circuit 52 has two inputs, one of which is connected to the terminal I 3 of the member 3 and the other is connected to potentiometer cursor 51.
  • the comparator 53 also has two inputs, one is connected to the output of the circuit 52 and the other is connected to the input terminal 1 10 of the device 3. The output of the comparator 53 is connected to the output terminals I 8 and I9 of device 3.
  • Fig. 2 also show the devices for displaying the reference values R and e of the display panel 29.
  • These devices are constituted by analog digital encoders 54 and 55 whose parallel outputs are connected respectively to the input terminals I 1 and I 2 of the device 3.
  • These coders can consist of simple switch registers whose state represents for example the binary-coded decimal value of the set value.
  • the atmospheric pressure sensor 30 connected to terminal I 3 of the device 3 and the pressure sensor 33 connected to terminal I 10 .
  • the operation of the cooling installation is as follows.
  • the operator has the manufacturing data which are the thickness e of the sheet and the cooling rate R corresponding to the desired structures of the metal. These two data are displayed on the switch registers 55 and 54 of the display panel 29. They are introduced on the input terminals I 1 and I 2 of the control and regulation device 3 in the direction of the addressing inputs of the memory of the member 34.
  • the regulating device 37 regulates the temperature of the water in the tank 2.
  • the operating temperature relative to the cooling water is determined by the summing circuit 43 and the multiplication circuit by a constant 39.
  • the circuit 39 delivers an output quantity q. ⁇ which is proportional to the quantity ⁇ of the heat flux exchanged between the sheet metal plate and the cooling water.
  • This quantity q. ⁇ is added to the aforementioned constant p displayed inside the calculating member 37 on the potentiometer 40.
  • the permitted temperature variation limits ⁇ f are displayed on potentiometers 41 and 42, potentiometer 41 delivering a value + ⁇ and potentiometer 42 delivering a value - ⁇ .
  • the value + ⁇ is added to the operating temperature ⁇ f in the summing circuit 44 which outputs a value ⁇ f + ⁇ .
  • This theoretical ⁇ f + ⁇ value is compared to the water temperature measured in tank 2, by the comparator46 the output of which controls the control member 50 of the water supply solenoid valve 27 when the temperature ⁇ of the measured water is greater than the calculated value f + ⁇ .
  • the subtraction circuit 45 subtracts from the calculated value ⁇ , the value ⁇ transmitted by the potentiometer 42.
  • the result ⁇ f - ⁇ obtained is compared to the value ⁇ of the water measured in tank 2 to the using comparator 47 to close the solenoid valve 27 when the measured water temperature is lower than the calculated value ⁇ f - ⁇ .
  • the regulation circuit 38 makes it possible to act against the pressure losses which take place in the return circuit and which are due to the reduction in the rate of injection of the cooling water by the pumps.
  • the summation circuit 52 adds the value of the atmospheric pressure Po sensed by the pressure sensor 30 to a value t displayed on the potentiometer 51 and transmits the result of the summation Po + E to the input of the comparator 53 which compares this value at the pressure value P measured by the pressure sensor 33 inside the cooling enclosure 9.
  • the comparator 53 controls ab the opening of the return solenoid valves 26 a , 26 b .
  • the comparator 53 controls the closing of the return solenoid valves 26 a and 26b, so as to increase the pressure P inside the enclosure of cooling.
  • the temperature regulation device keeps the water in the tank at a constant temperature, which allows firstly, to maintain at a constant level the heat flow exchanged between the sheet and the cooling water and secondly, to keep the tension of steam in the siphon formed by the discharge conduits 1 6 a, 17 a , thus avoiding the defusing of the latter and the flow of water through the ends of the machine.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP19820402134 1981-11-26 1982-11-23 Verfahren und Vorrichtung zum gesteuerten Abkühlen von Blech Expired EP0080932B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8122142A FR2517039A1 (fr) 1981-11-26 1981-11-26 Procede et installation pour effectuer le refroidissement controle de toles
FR8122142 1981-11-26

Publications (2)

Publication Number Publication Date
EP0080932A1 true EP0080932A1 (de) 1983-06-08
EP0080932B1 EP0080932B1 (de) 1985-04-24

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ID=9264389

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820402134 Expired EP0080932B1 (de) 1981-11-26 1982-11-23 Verfahren und Vorrichtung zum gesteuerten Abkühlen von Blech

Country Status (5)

Country Link
EP (1) EP0080932B1 (de)
JP (1) JPS58126933A (de)
DE (1) DE3263303D1 (de)
FR (1) FR2517039A1 (de)
SU (1) SU1131461A3 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0395191A1 (de) * 1989-04-27 1990-10-31 MANNESMANN Aktiengesellschaft Verfahren und Vorrichtung zum Abkühlen eines langgestreckten zylindrischen Körpers
US5167137A (en) * 1988-01-29 1992-12-01 Southwire Company Method for automatically adjusting soluble oil flow rates to control physical properties of continuously rolled rod
WO2003026813A1 (fr) * 2001-09-21 2003-04-03 Jfe Steel Corporation Procede et dispositif de refroidissement d'une tole d'acier
CN114147077A (zh) * 2021-11-30 2022-03-08 江苏中旭冷拉型钢有限公司 一种用于冷拉钢加工的轧机
EP4001447A4 (de) * 2019-08-30 2022-06-15 JFE Steel Corporation Stahlblech, element und verfahren zur herstellung davon

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5329779A (en) * 1993-02-09 1994-07-19 C.V.G. Siderurgica Del Orinoco, C.A. Method and apparatus for cooling workpieces
CZ2014185A3 (cs) * 2014-03-26 2015-10-14 Technická univerzita v Liberci, Katedra strojírenské technologie Způsob stanovení ochlazovací schopnosti média pro konkrétní zpracovávané materiály včetně možnosti simulace tepelného zpracování rozměrných dílů
AU2017421673B2 (en) * 2017-06-26 2020-10-01 Arcelormittal Method and electronic device for determining the temperature of a metal strip, related control method, computer program, control apparatus and hot rolling installation
CN112292469A (zh) 2018-06-13 2021-01-29 诺维尔里斯公司 用于在轧制之后将金属带淬火的系统和方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1603214A (de) * 1967-10-18 1971-03-22
DE2151210A1 (de) * 1971-10-14 1973-04-19 Schloemann Ag Wasserkuehleinrichtung fuer schnelllaufenden walzdraht
FR2209086A1 (de) * 1972-11-30 1974-06-28 Kawasaki Heavy Ind Ltd
FR2223096A1 (de) * 1973-03-26 1974-10-25 Usinor
FR2412360A1 (fr) * 1977-12-21 1979-07-20 Arbed Procede et installation pour le refroidissement controle de produits lamines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1603214A (de) * 1967-10-18 1971-03-22
DE2151210A1 (de) * 1971-10-14 1973-04-19 Schloemann Ag Wasserkuehleinrichtung fuer schnelllaufenden walzdraht
FR2209086A1 (de) * 1972-11-30 1974-06-28 Kawasaki Heavy Ind Ltd
FR2223096A1 (de) * 1973-03-26 1974-10-25 Usinor
FR2412360A1 (fr) * 1977-12-21 1979-07-20 Arbed Procede et installation pour le refroidissement controle de produits lamines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5167137A (en) * 1988-01-29 1992-12-01 Southwire Company Method for automatically adjusting soluble oil flow rates to control physical properties of continuously rolled rod
EP0395191A1 (de) * 1989-04-27 1990-10-31 MANNESMANN Aktiengesellschaft Verfahren und Vorrichtung zum Abkühlen eines langgestreckten zylindrischen Körpers
WO2003026813A1 (fr) * 2001-09-21 2003-04-03 Jfe Steel Corporation Procede et dispositif de refroidissement d'une tole d'acier
US7294215B2 (en) 2001-09-21 2007-11-13 Jfe Steel Corporation Method and device for cooling steel sheet
EP4001447A4 (de) * 2019-08-30 2022-06-15 JFE Steel Corporation Stahlblech, element und verfahren zur herstellung davon
CN114147077A (zh) * 2021-11-30 2022-03-08 江苏中旭冷拉型钢有限公司 一种用于冷拉钢加工的轧机

Also Published As

Publication number Publication date
FR2517039A1 (fr) 1983-05-27
SU1131461A3 (ru) 1984-12-23
DE3263303D1 (en) 1985-05-30
FR2517039B1 (de) 1984-12-14
EP0080932B1 (de) 1985-04-24
JPH0471968B2 (de) 1992-11-17
JPS58126933A (ja) 1983-07-28

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