US20020020474A1 - Method and device for cooling hot-rolled profiled sections - Google Patents

Method and device for cooling hot-rolled profiled sections Download PDF

Info

Publication number
US20020020474A1
US20020020474A1 US09/738,865 US73886500A US2002020474A1 US 20020020474 A1 US20020020474 A1 US 20020020474A1 US 73886500 A US73886500 A US 73886500A US 2002020474 A1 US2002020474 A1 US 2002020474A1
Authority
US
United States
Prior art keywords
cooling
parameters
rolling
temperature
functional units
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.)
Abandoned
Application number
US09/738,865
Inventor
Meinert Meyer
Uwe Plociennik
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.)
SMS Siemag AG
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Assigned to SMS DEMAG AG reassignment SMS DEMAG AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MEYER, MEINERT, PLOCIENNIK, UWE
Publication of US20020020474A1 publication Critical patent/US20020020474A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • 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
    • 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
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B21B2261/21—Temperature profile
    • 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
    • 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
    • C21D1/84—Controlled slow cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to a method for cooling hot-rolled profiled sections from the rolling heat.
  • the profiled sections are formed of section parts of different mass.
  • Profiled rolling stock for example, rails
  • rails are cooled on cooling banks from the rolling heat to a temperature under 80° C.
  • the rail head and the rail foot exhibit different cooling behavior, wherein the rail foot as a result of its larger heat conveying surfaces relative to its mass in comparison to the rail head cools faster then the rail head.
  • This warping action can be counteracted to a certain degree by pre-bending the still hot rail.
  • this requires disadvantageously a complex hot bending process of uncertain results.
  • the rails must be straightened after cooling.
  • inherent stresses are caused in the rail which have a detrimental effect on their strength. Numerous proposals are known in order to counteract these problems.
  • German laid-open patent document DE 42 37 991 A1 describes a method for cooling profiled rolling stock hot-rolled in roll stands, in particular, of rails, on a cooling bank, by means of natural convection or forced air cooling.
  • the invention resides in that the rails are suspended with their rail head upside down and transported across a cooling bank. With this measure, the heat transmission conditions are changed in the case of natural convection already so beneficially that the temperature difference between the rail head and the rail foot of the rail of approximately 140° C. for a horizontally positioned rail is reduced to approximately 50° C. for the suspended rail.
  • German patent 21 61 704 describes a method as well as a device for a stress-free and warp-free cooling of railroad rails which resides in that identical profiled rail sections to be cooled are symmetrically clamped together in pairs, rail foot against rail foot which thus provide abutments for one another, and are transported by a transverse conveyor across a cooling bank. Since each rail head has substantially the same mass as the rail foot, but the peripheral surface of the rail foot is twice that of the rail head, the peripheral surface of the rail feet in their clamped position in comparison to their mass is approximately of the same magnitude as the ratio of the peripheral surface and mass of the rail head. This provides a uniform cooling of the rail heads and the rail feet.
  • German patent 404 127 a method for straightening metal rods of asymmetric cross-section, in particular, of railroad rails, is disclosed wherein the thick parts of the cross-section are subjected to such a controlled artificial cooling that all parts, despite their non-uniform thickness, shrink by the same amount and the rods, during cooling to ambient temperature, remain straight.
  • the artificial cooling is realized either by immersion into a liquid, wetting or spraying, by blowing atomized liquid, by steam, air or other gases, wherein the employed medium acts continuously or intermittently during the entire cooling period or only during a portion of the cooling period.
  • the German patent 19 42 929 describes a method for cooling rails, wherein the rails, before reaching the austenite transformation temperature, are placed on the rail foot at a spacing above a heat-reflecting layer.
  • a solid insulation material can be placed onto the running surface of the rails during the further course of cooling.
  • a mutual positive effect by radiation is moreover achieved in this method in that the rails are positioned directly adjacent to one another so that the rail feet contact one another laterally. This results in a beneficial stress compensation in the rail cross-section.
  • the placement of the rails on the rail foot before reaching the austenite transformation temperature at a spacing above a heat-reflecting layer has the advantage that a premature beginning of the austenite transformation in the rail foot and rail stay is prevented.
  • the known methods have the common disadvantage that they are more or less empirical, i.e., it is first necessary by means of time-consuming experiments to determine which parameters have to be observed when performing the method in order to ensure the desired cooling results. Accordingly, for each batch at least test samples of hot-rolled profiled sections are used and, in the case of results that are not immediately satisfying, tests must be repeated and scrap metal is produced in many cases.
  • this is achieved in that the course of temperature in the rolling mill is simulated for the rolling stock already before the actual rolling and cooling process, wherein in several simulation calculations the cooling parameters in the simulation are varied such that the adjustments of the desired cooling process, for example, cooling by quenching or cooling with minimal temperature differences, can be controlled by the parameters obtained from the simulations taking into account the actual values measured upstream and downstream of the cooling stretch.
  • the required control parameters for example, amplification factors
  • required control parameters for example, amplification factors
  • the measures of the invention make it possible to set the cooling parameters such as cooling medium pressure, cooling medium volume flow, arrangement of the cooling zones and of the profiled sections to be cooled, also for changing profile shapes, such that an optimal cooling result will be obtained.
  • the simulation calculations are controlled and supplemented by measuring the rolling stock temperature across the periphery and the length of the profiled section upstream and downstream of the cooling zones. Should the temperatures deviate already before entry of the rolling stock into the cooling zone, a change of the preadjustment of the cooling zone still before entry of the rolling stock into the cooling zone is carried out. Should the temperatures of the rolling stock deviate from the nominal temperatures downstream of the cooling zone, the parameters resulting from the simulation are also used for a correction of the adjustments of the cooling stretch.
  • FIGURE of the drawing shows an embodiment according to the invention of a closed active loop for controlling the cooling process.
  • the closed active loop is comprised of five linked functional units 1 , 2 , 3 , 4 , 5 whose tasks and functions will be explained in the following.
  • a data transfer from the process data unit 3 to the technology data unit 2 is carried out via a corresponding link 7 , wherein the technology data unit has the following functions:
  • the technology data unit 2 is connected to the simulation unit 1 by means of a link 8 so that the active loop is closed.
  • control unit 4 For optimizing the determined cooling model a control unit 4 is connected between the process data unit 3 and the simulation unit 1 by means of the link 9 , wherein the control unit 4 performs the following functions:

Abstract

In a method for cooling hot-rolled profiled sections from the rolling heat, wherein the profiled sections are formed of section parts of different mass, wherein, by using measuring-technological means in cooperation with a computer with the aid of a computing program, the quantity of heat to be proportionally removed from the different section parts in accordance with their mass and temperature and the amount of cooling medium required therefor are calculated and controlled, the course of temperature for the rolling stock in the rolling mill is simulated already before the actual rolling and cooling process by performing several simulation calculations by varying the cooling parameters in the simulation calculation to obtain calculated parameters. The actual values are measured upstream and downstream of the cooling stretch. The adjustments of the desired cooling process are controlled based on the calculated parameters obtained from the simulations and the actual values measured upstream and downstream of the cooling stretch. A device for performing the method has a closed active loop of five linked functional units.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention [0001]
  • The invention relates to a method for cooling hot-rolled profiled sections from the rolling heat. The profiled sections are formed of section parts of different mass. By using measuring-technological means in cooperation with a computer with the aid of a computing program, the quantity of heat to be proportionally removed from the different section parts in accordance with their mass and temperature and the amount of cooling medium required therefor are calculated and controlled. [0002]
  • 2. Description of the Related Art [0003]
  • Profiled rolling stock, for example, rails, are cooled on cooling banks from the rolling heat to a temperature under 80° C. Because of the asymmetric arrangement of the masses of the profiled section, the rail head and the rail foot exhibit different cooling behavior, wherein the rail foot as a result of its larger heat conveying surfaces relative to its mass in comparison to the rail head cools faster then the rail head. This means that the rail will warp during cooling. This warping action can be counteracted to a certain degree by pre-bending the still hot rail. However, this requires disadvantageously a complex hot bending process of uncertain results. In any case, the rails must be straightened after cooling. As a result of the cooling process as well as the straightening process, inherent stresses are caused in the rail which have a detrimental effect on their strength. Numerous proposals are known in order to counteract these problems. [0004]
  • The German laid-open patent document DE 42 37 991 A1 describes a method for cooling profiled rolling stock hot-rolled in roll stands, in particular, of rails, on a cooling bank, by means of natural convection or forced air cooling. The invention resides in that the rails are suspended with their rail head upside down and transported across a cooling bank. With this measure, the heat transmission conditions are changed in the case of natural convection already so beneficially that the temperature difference between the rail head and the rail foot of the rail of approximately 140° C. for a horizontally positioned rail is reduced to approximately 50° C. for the suspended rail. [0005]
  • The German patent 21 61 704 describes a method as well as a device for a stress-free and warp-free cooling of railroad rails which resides in that identical profiled rail sections to be cooled are symmetrically clamped together in pairs, rail foot against rail foot which thus provide abutments for one another, and are transported by a transverse conveyor across a cooling bank. Since each rail head has substantially the same mass as the rail foot, but the peripheral surface of the rail foot is twice that of the rail head, the peripheral surface of the rail feet in their clamped position in comparison to their mass is approximately of the same magnitude as the ratio of the peripheral surface and mass of the rail head. This provides a uniform cooling of the rail heads and the rail feet. [0006]
  • In U.S. Pat. No. 468,788 a method for cooling rails is disclosed wherein the rails are suspended in a device with their rail heads upside down and completely or partially immersed in a tank filled with water to thus be cooled, wherein they are simultaneously pressed by means of pressure screws against a stationary abutment. [0007]
  • In German patent 404 127 a method for straightening metal rods of asymmetric cross-section, in particular, of railroad rails, is disclosed wherein the thick parts of the cross-section are subjected to such a controlled artificial cooling that all parts, despite their non-uniform thickness, shrink by the same amount and the rods, during cooling to ambient temperature, remain straight. This is achieved in that the artificial cooling is realized either by immersion into a liquid, wetting or spraying, by blowing atomized liquid, by steam, air or other gases, wherein the employed medium acts continuously or intermittently during the entire cooling period or only during a portion of the cooling period. [0008]
  • The German patent 19 42 929 describes a method for cooling rails, wherein the rails, before reaching the austenite transformation temperature, are placed on the rail foot at a spacing above a heat-reflecting layer. In addition, a solid insulation material can be placed onto the running surface of the rails during the further course of cooling. A mutual positive effect by radiation is moreover achieved in this method in that the rails are positioned directly adjacent to one another so that the rail feet contact one another laterally. This results in a beneficial stress compensation in the rail cross-section. The placement of the rails on the rail foot before reaching the austenite transformation temperature at a spacing above a heat-reflecting layer has the advantage that a premature beginning of the austenite transformation in the rail foot and rail stay is prevented. [0009]
  • The opposite approach, i.e., through-hardening of the rail head as a result of a corresponding rapid cooling process is achieved according to French patent 543.461 in that the rail is suspended upside-down, with the rail foot facing upwardly, and subjected to a series of defined immersion processes of very short duration in a reservoir filled with water. [0010]
  • The known methods have the common disadvantage that they are more or less empirical, i.e., it is first necessary by means of time-consuming experiments to determine which parameters have to be observed when performing the method in order to ensure the desired cooling results. Accordingly, for each batch at least test samples of hot-rolled profiled sections are used and, in the case of results that are not immediately satisfying, tests must be repeated and scrap metal is produced in many cases. [0011]
  • The knowledge of the temperature distribution during the forming process across the entire cross-section and across the length of the rolling stock is required for a directed cooling of profiled rolling stock. In German laid-open patent document DE 195 03 747 A1 it is therefore suggested that first, by using measuring-technological means in cooperation with a computer with the aid of a computing program, the quantity of heat to be proportionally removed from the different profiled sections in accordance with their mass and temperature and the amount of cooling medium required for this purpose are determined and calculated and that, subsequently, the cooling of the different section parts or their masses is carried out in a controlled fashion such that they reach the conversion line A[0012] r3/Ar1 for the decomposition of the gamma mixed crystals into ferrite and/or pearlite with release of transformation heat with as little time lag as possible between the section parts. Advantageously, this method makes it possible that for different batches a perfect cooling result without warping of the profiled sections can be obtained without requiring costly empirical experiments.
    • SUMMARY OF THE INVENTION
  • It is an object of the present invention to provide a method for cooling hot-rolled profiled section of the aforementioned kind and to improve it such that the aforementioned difficulties are overcome and a warp-free cooling result during cooling from the rolling heat can be achieved without costly and time-consuming experiments and without producing scrap metal resulting from such experiments. [0013]
  • In accordance with the present invention, this is achieved in that the course of temperature in the rolling mill is simulated for the rolling stock already before the actual rolling and cooling process, wherein in several simulation calculations the cooling parameters in the simulation are varied such that the adjustments of the desired cooling process, for example, cooling by quenching or cooling with minimal temperature differences, can be controlled by the parameters obtained from the simulations taking into account the actual values measured upstream and downstream of the cooling stretch. [0014]
  • According to an advantageous embodiment of the invention the required control parameters (for example, amplification factors) required for changing the cooling parameters are also calculated during the simulation calculation and are made available to the control. [0015]
  • Moreover, it is advantageously provided that for the simulation of the temperature course of the rolling stock the entire surface of the rolling stock is divided into different zones with correspondingly assigned boundary conditions and these zones are loaded with the calculated cooling parameters. [0016]
  • The measures of the invention make it possible to set the cooling parameters such as cooling medium pressure, cooling medium volume flow, arrangement of the cooling zones and of the profiled sections to be cooled, also for changing profile shapes, such that an optimal cooling result will be obtained. [0017]
  • The simulation calculations are controlled and supplemented by measuring the rolling stock temperature across the periphery and the length of the profiled section upstream and downstream of the cooling zones. Should the temperatures deviate already before entry of the rolling stock into the cooling zone, a change of the preadjustment of the cooling zone still before entry of the rolling stock into the cooling zone is carried out. Should the temperatures of the rolling stock deviate from the nominal temperatures downstream of the cooling zone, the parameters resulting from the simulation are also used for a correction of the adjustments of the cooling stretch. [0018]
  • For performing the method of the invention, several functional units are linked to one another to a closed active loop illustrated in the drawing in an exemplary fashion. [0019]
    • BRIEF DESCRIPTION OF THE DRAWING
  • The only FIGURE of the drawing shows an embodiment according to the invention of a closed active loop for controlling the cooling process. [0020]
    • DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • The closed active loop is comprised of five linked [0021] functional units 1, 2, 3, 4, 5 whose tasks and functions will be explained in the following.
  • In the [0022] simulation unit 1 the following tasks are performed:
  • simulation of the temperature course for the rolling and cooling process; [0023]
  • generation of the cooling programs with the adjusting values for the water cooling stretches and the air cooling stretches, namely: [0024]
  • storage of the pass schedule, [0025]
  • calculation of the rolling force, the rolling output, and the rolling moment, [0026]
  • calculation of the forming energy and temperature distribution within the rolling stock, [0027]
  • calculation of the water pressures and water quantities, [0028]
  • determination of the number and switching sequence of the water cooling zones, [0029]
  • calculation of the control parameters, [0030]
  • determination of the yield strength as a function of the forming conditions, the forming speed, and the forming temperature, [0031]
  • determination of the caloric data as a function of the temperature, [0032]
  • calculation of the temperature losses between the stands, in the water cooling stretch, and on the air cooling stretches; [0033]
  • representation of the courses of temperature in the rolling mill, in the water cooling stretches, and in the air cooling stretches; [0034]
  • representation of the courses of cooling in the TTT (time-temperature-transformation) diagram, [0035]
  • representation of the cooling rate course in the air cooling stretches, [0036]
  • representation of the microstructure proportions as well as the hardness corresponding to the TTT diagram and input of the calculated cooling rates, [0037]
  • output of the adjusting values for the water cooling stretch and the air cooling stretches, [0038]
  • output of the plotter diagrams for [0039]
  • temperature course in the rolling mill and the cooling stretches as a function of time, [0040]
  • temperature course in the rolling mill and the cooling stretches across the length, [0041]
  • temperature profile of the rolling stock cross-section in the cooling stretches, [0042]
  • cooling rate courses in the cooling stretches, [0043]
  • cooling course in the TTT diagram, [0044]
  • microstructure proportions and hardness, [0045]
  • comparison nominal/actual values in the temperature course. [0046]
  • Via the link [0047] 10 a communication with the control unit 5 takes place. The cooling programs generated in the simulation unit 1 are input in the control unit 5. In the control unit 5 the following tasks are performed:
  • administration of the cooling programs, of the production data, the product data and the process data, [0048]
  • pre-setting the adjusting values for the water cooling stretches and the air cooling stretches, [0049]
  • controlling and governing the cooling stretches (water cooling stretches, air cooling stretches), [0050]
  • measuring the actual production values, actual product values, and actual process values, [0051]
  • storing the production data, product data, and process data for a temporally delayed output, [0052]
  • visualization of the cooling processes, [0053]
  • graphic illustration for [0054]
  • final rolling temperature, [0055]
  • entry temperature cooling stretch, [0056]
  • cooling time t[0057] 8/5.
  • Via a [0058] link 6 the obtained product and process data are sent to the process data unit 3 in which the obtained data are processed and represented. In detail, the following functions are performed:
  • processing the actual values stored in the “KOMP file”, namely: [0059]
  • temperatures with representation of [0060]
  • average values [0061]
  • minimum and maximum values [0062]
  • standard deviation (1 sigma and 2 sigma) [0063]
  • frequency distribution curve [0064]
  • summation curve, [0065]
  • pressures, [0066]
  • volume flows, [0067]
  • cooling time on the cooling stretches (from 800° C. to 500° C.=t[0068] 8/5)
  • only actual values, [0069]
  • mechanical properties such as, for example, [0070]
  • tensile strength—R[0071] m
  • tensile yield strength—R[0072] e
  • extension—A[0073] 10
  • constriction—Z [0074]
  • representation of the results for [0075]
  • a billet [0076]
  • a rolling batch [0077]
  • a cooling program [0078]
  • a time interval. [0079]
  • For optimizing the quality, a data transfer from the [0080] process data unit 3 to the technology data unit 2 is carried out via a corresponding link 7, wherein the technology data unit has the following functions:
  • combining and compressing the cooling programs for a quick review, [0081]
  • setting guide values for the cooling strategies, [0082]
  • automatic adjustment of cooling programs for the pre-set values of the nominal temperatures, [0083]
  • setting the desired mechanical properties as well as performing feedback of the properties obtained by the rolling process for quality optimization. [0084]
  • For determining the optimal cooling strategy the [0085] technology data unit 2 is connected to the simulation unit 1 by means of a link 8 so that the active loop is closed.
  • For optimizing the determined cooling model a [0086] control unit 4 is connected between the process data unit 3 and the simulation unit 1 by means of the link 9, wherein the control unit 4 performs the following functions:
  • recalculation of the cooling programs with the actual values measured during the rolling process for optimizing the simulation model, [0087]
  • representation of the temperature course based on the recalculation, [0088]
  • comparison of the simulated and measured temperature values with output of deviations in ° C. and %. [0089]
  • With the features and measures of the invention the cooling of rolled profiled sections which are usually difficult to cool can be carried out in an optimized fashion because according to the invention the actual rolling stock temperatures are adjusted quickly to the desired nominal temperatures by correction of the cooling program, wherein the functional units explained in connection with the embodiment can be simplified or can be supplemented by additional functional units in the spirit of the invention. [0090]
  • While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles. [0091]

Claims (8)

What is claimed is:
1. A method for cooling hot-rolled profiled sections from the rolling heat, wherein the profiled sections are formed of section parts of different mass, wherein, by using measuring-technological means in cooperation with a computer with the aid of a computing program, the quantity of heat to be proportionally removed from the different section parts in accordance with their mass and temperature and the amount of cooling medium required therefor are calculated and controlled, the method comprising the steps of:
simulating the course of temperature for the rolling stock in the rolling mill already before the actual rolling and cooling process by performing several simulation calculations by varying the cooling parameters in the simulation calculation to obtain calculated parameters;
measuring actual values upstream and downstream of the cooling stretch
controlling the adjustments of the desired cooling process based on the calculated parameters obtained from the simulations and the actual values measured upstream and downstream of the cooling stretch.
2. The method according to claim 1, wherein the cooling parameters are based on cooling by quenching or cooling with minimal temperature differences.
3. The method according to claim 1, wherein, in the step of simulating, control parameters for changing the cooling parameters are calculated and employed in the step of controlling.
4. The method according to claim 3, wherein the control parameters are amplification factors.
5. The method according to claim 1, wherein, in the step of simulating, the entire surface of the rolling stock is divided into different zones having corresponding boundary conditions and wherein the different zones are loaded with calculated cooling parameters.
6. A device for performing the method according to claim 1, comprising a closed active loop of functional units linked with one another, wherein:
a first one of the functional units is a simulation unit configured to simulate a course of temperature of the rolling and cooling process and to generate cooling programs for the cooling stretches with cooling parameters and control parameters for the controlling step;
a second one of the functional units is a technology data unit containing data for cooling strategies, data for automatic generation of cooling programs, data of desired mechanical properties, and feedback data of properties obtained in the rolling process for optimizing the product quality;
a third one of the functional units is a process data unit for processing actual values;
a fourth one of the functional units is a control unit configured to recalculate the cooling programs with the measured actual values and to compare the simulated and the measured temperature values; and
a fifth one of the functional units is a control unit configured to manage the cooling programs and pre-set values of the adjustments of the cooling stretches, to control and govern the cooling zones, and to measure the actual values.
7. The device according to claim 6, wherein the cooling parameters are pressure, volume flow, and the number of cooling zones.
8. The device according to claim actual values are temperatures, cooling medium pressures, and cooling medium volume flows, cooling times, and mechanical properties.
US09/738,865 1999-12-23 2000-12-15 Method and device for cooling hot-rolled profiled sections Abandoned US20020020474A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19962891.2 1999-12-23
DE1999162891 DE19962891A1 (en) 1999-12-23 1999-12-23 Method and device for cooling hot-rolled profiles

Publications (1)

Publication Number Publication Date
US20020020474A1 true US20020020474A1 (en) 2002-02-21

Family

ID=7934412

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/738,865 Abandoned US20020020474A1 (en) 1999-12-23 2000-12-15 Method and device for cooling hot-rolled profiled sections

Country Status (7)

Country Link
US (1) US20020020474A1 (en)
EP (1) EP1111074B1 (en)
JP (1) JP2001198614A (en)
KR (1) KR100686925B1 (en)
AT (1) ATE290612T1 (en)
DE (2) DE19962891A1 (en)
EG (1) EG22728A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITLI20090004A1 (en) * 2009-05-21 2010-11-22 Lucchini S P A RAILWAY RAILWAYS IN MORROLOGY AND COLONIAL PEARLS WITH A HIGH RELATIONSHIP.
US20110272067A1 (en) * 2008-11-20 2011-11-10 voestalpine Tublars GmbH & Co KG Method and Apparatus for Producing Steel Pipes Having Particular Properties
US20120216923A1 (en) * 2009-11-24 2012-08-30 Sumitomo Metal Industries, Ltd. Manufacturing apparatus of hot-rolled steel sheet and manufacturing method of hot-rolled steel sheet
EP2674504A1 (en) * 2012-06-11 2013-12-18 Siemens S.p.A. Method and system for thermal treatments of rails
CN103537490A (en) * 2013-10-24 2014-01-29 天津工业大学 Method for predicating 33Mn2V hot-rolled seamless steel tube perforation structure
CN114480829A (en) * 2022-01-13 2022-05-13 陕西化建工程有限责任公司 Method for simulating heat treatment process of equipment in process of different thicknesses by heat treatment test plate

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102151704B (en) * 2010-02-11 2013-04-03 宝山钢铁股份有限公司 Stelmor line cooling method of high-speed wire by taking temperature as direct-control parameter
DE102010033473B4 (en) * 2010-08-05 2014-05-15 Maschinenbau-Service-Automatisierungstechnik Chemnitz GmbH Process for the heat treatment of the wheel rim of rail vehicle wheels
CN104923575B (en) * 2015-05-28 2017-12-12 柳州钢铁股份有限公司 Steel rolling temprature control method
CN108237146A (en) * 2017-12-07 2018-07-03 江苏省沙钢钢铁研究院有限公司 A kind of method for improving cord steel oxide skin stripping performance

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4486248A (en) * 1982-08-05 1984-12-04 The Algoma Steel Corporation Limited Method for the production of improved railway rails by accelerated cooling in line with the production rolling mill
EP0453566B1 (en) * 1989-06-16 1998-04-08 Kawasaki Steel Corporation Steel material cooling control method
JPH04141520A (en) * 1990-09-28 1992-05-15 Kawasaki Steel Corp Production of thin web wide flange shape h-beam
JP2653617B2 (en) * 1992-12-11 1997-09-17 新日本製鐵株式会社 Cooling control method for continuous hot rolling
DE19503747A1 (en) * 1995-02-04 1996-08-08 Schloemann Siemag Ag Method and device for cooling hot-rolled profiles
JPH0947808A (en) * 1995-08-02 1997-02-18 Kawasaki Steel Corp Hot finish rolling method
EP0807692A1 (en) * 1996-05-15 1997-11-19 Sms Schloemann-Siemag Aktiengesellschaft Method of cooling structural steel beams
JPH11176707A (en) * 1997-12-05 1999-07-02 Ricoh Co Ltd Semiconductor process device simulation device
JP3612973B2 (en) * 1997-12-22 2005-01-26 松下電工株式会社 Formability analysis method
JPH11347629A (en) * 1998-06-09 1999-12-21 Nkk Corp Straightening and cooling device for high temperature steel plate and its straightening and cooling method
DE19850253A1 (en) * 1998-10-31 2000-05-04 Schloemann Siemag Ag Method and system for controlling cooling sections

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110272067A1 (en) * 2008-11-20 2011-11-10 voestalpine Tublars GmbH & Co KG Method and Apparatus for Producing Steel Pipes Having Particular Properties
US9394582B2 (en) * 2008-11-20 2016-07-19 Voestalpine Tubulars Gmbh & Co Kg Method and apparatus for producing steel pipes having particular properties
ITLI20090004A1 (en) * 2009-05-21 2010-11-22 Lucchini S P A RAILWAY RAILWAYS IN MORROLOGY AND COLONIAL PEARLS WITH A HIGH RELATIONSHIP.
US20120216923A1 (en) * 2009-11-24 2012-08-30 Sumitomo Metal Industries, Ltd. Manufacturing apparatus of hot-rolled steel sheet and manufacturing method of hot-rolled steel sheet
US8500927B2 (en) * 2009-11-24 2013-08-06 Nippon Steel & Sumitomo Metal Corporation Manufacturing apparatus of hot-rolled steel sheet and manufacturing method of hot rolled steel sheet
EP2674504A1 (en) * 2012-06-11 2013-12-18 Siemens S.p.A. Method and system for thermal treatments of rails
WO2013186137A1 (en) * 2012-06-11 2013-12-19 Siemens S.P.A. Method and system for thermal treatments of rails
US10125405B2 (en) 2012-06-11 2018-11-13 Primetals Technologies Italy S.R.L. Method and system for thermal treatments of rails
CN103537490A (en) * 2013-10-24 2014-01-29 天津工业大学 Method for predicating 33Mn2V hot-rolled seamless steel tube perforation structure
CN114480829A (en) * 2022-01-13 2022-05-13 陕西化建工程有限责任公司 Method for simulating heat treatment process of equipment in process of different thicknesses by heat treatment test plate

Also Published As

Publication number Publication date
KR100686925B1 (en) 2007-02-26
EG22728A (en) 2003-07-30
DE50009717D1 (en) 2005-04-14
EP1111074A2 (en) 2001-06-27
EP1111074B1 (en) 2005-03-09
EP1111074A3 (en) 2004-01-07
ATE290612T1 (en) 2005-03-15
JP2001198614A (en) 2001-07-24
DE19962891A1 (en) 2001-06-28
KR20010067418A (en) 2001-07-12

Similar Documents

Publication Publication Date Title
CA2270450A1 (en) Process for monitoring and controlling the quality of rolled products from hot-rolled processes
US20020020474A1 (en) Method and device for cooling hot-rolled profiled sections
CN110404978A (en) A kind of method of high-precision control hot-strip slight center wave rolling
CN102814481B (en) Continuous casting secondary cooling dynamic control method based on online temperature measuring and heat transferring model
US4872923A (en) Die-less drawing method and apparatus
CN107760830A (en) A kind of control method of big substance, big cross section super-thick steel plate roll-type quenching process
CN106862283B (en) The ultrafast cold Process Control System of hot rolling
CN1906314B (en) Rail manufacturing method
JP7200982B2 (en) Material property value prediction system and metal plate manufacturing method
CN101921907A (en) Plate shape correction method during steel plate quenching based on model control
CN1076757C (en) Method and device for cooling hot-rolled shaped material
US20080135203A1 (en) Continuous Casting and Rolling Installation For Producing a Steel Strip
JP2006281300A (en) Cooling control method, device, and computer program
CN106557651A (en) A kind of optimization method and device of roller temperature model cootrol precision
RU2301129C2 (en) Method of continuous casting
RU2752518C1 (en) Method for operating the annealing furnace
KR102143118B1 (en) Temperature control apparatus and method thereof
US10100384B2 (en) Method for producing a tempered seamlessly hot-fabricated steel pipe
US6689230B1 (en) Method and apparatus for cooling hot-rolled sections
CN101131572B (en) System for fast cooling temperature control
JP2002172411A (en) Method and apparatus for heat-treating thick steel plate
CN111983983A (en) Intelligent control method and system for hot rolled steel plate heat treatment plate shape
CN101972780B (en) Hot rolling titanium casting blank temperature control method
CN1171307A (en) Method for cooling deformed steel girder
JPH02112813A (en) Temperature control method for rolling and cooling of wire rod, bar or the like

Legal Events

Date Code Title Description
AS Assignment

Owner name: SMS DEMAG AG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MEYER, MEINERT;PLOCIENNIK, UWE;REEL/FRAME:011735/0535

Effective date: 20010112

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION