CN109013717A - A kind of hot continuous rolling centre base center portion temperature computation method - Google Patents

A kind of hot continuous rolling centre base center portion temperature computation method Download PDF

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CN109013717A
CN109013717A CN201810951651.7A CN201810951651A CN109013717A CN 109013717 A CN109013717 A CN 109013717A CN 201810951651 A CN201810951651 A CN 201810951651A CN 109013717 A CN109013717 A CN 109013717A
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temperature
rolled piece
average value
value
effective
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CN109013717B (en
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彭文
许楠
胡云建
鲁兴
孙杰
丁敬国
李旭
张殿华
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Northeastern University China
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Northeastern University China
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    • 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
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/06—Thermomechanical rolling

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  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)

Abstract

The present invention provides a kind of hot continuous rolling centre base center portion temperature computation method, is related to steel rolling automatic control technology field.Rolled piece mean temperature is calculated according to roll-force speed, the width and thickness that roughing area end rolling pass actual measurement obtains in this method, temperature drop loss of the rolled piece on conveyor roller is obtained by air-cooled warm extrusion die, obtain the mean temperature of rolled piece, further combine rolled piece in the surface temperature of any position of delay table, it can the center portion temperature of rolled piece is calculated.Method safety of the invention can be high, computational accuracy is high, it can be successfully applied to the calculating process of base center portion temperature among continuous hot-rolling mill, solve the problems, such as in real process that intermediate base center portion temperature can not direct-on-line measurement, while saving investment of production cost, guarantee the computational accuracy of temperature, provides good basis for being precisely controlled online for finished product thickness.

Description

A kind of hot continuous rolling centre base center portion temperature computation method
Technical field
The present invention relates to base center portion temperature computation sides among steel rolling automatic control technology field more particularly to a kind of hot continuous rolling Method.
Background technique
In hot continuous rolling production process, intermediate base center portion temperature is the basis of finish rolling area roll-force accurately calculated.Rolling line The temperature measurer of upper installation is only capable of measuring the surface temperature of rolled piece, is unable to measure rolled piece center portion temperature；Since rolled piece is in delay table On run with certain speed, real-time center portion temperature measurement can not be also carried out by way of immersioning thermocouple.
In slab in Furnace Production Process, it is heated to target tapping temperature according to certain heating curve, and is packed into The case where slab of heating furnace has the different types such as hot charging base, cold blank, loads in mixture there is also two kinds of slabs, two kinds of slabs enter furnace Temperature is inconsistent, to cause when slab is come out of the stove, the temperature of blank surface is almost the same, but the temperature presence of center portion is very big Difference generally calculate center portion temperature, the case where above-mentioned cold and hot slab loads in mixture using surface temperature in practical control process Under, the computational accuracy of center portion temperature cannot be guaranteed, and make a big impact to actual control effect.
The calculating for the center portion temperature that document " numerical simulation in hot-strip roughing area rolled piece temperature field " is mentioned is to use to have What the method for finite element analysis carried out, the boundary condition that this method uses be based on experience and it is assumed that and to calculate the time long, be not suitable for It is used in online.
Summary of the invention
The technical problem to be solved by the present invention is in view of the above shortcomings of the prior art, provide a kind of hot continuous rolling centre base heart Portion's temperature computation method, safely can be high, and computational accuracy is high, can be successfully applied to the calculating of base center portion temperature among continuous hot-rolling mill Process, solve the problems, such as in real process intermediate base center portion temperature can not direct-on-line measurement, save investment of production cost Meanwhile guaranteeing the computational accuracy of temperature, good basis is provided for being precisely controlled online for finished product thickness.
In order to solve the above technical problems, the technical solution used in the present invention is:
A kind of hot continuous rolling centre base center portion temperature computation method, comprising the following steps:
Step 1: slab is come out of the stove, and obtains slab PDI data；
Step 2: being calculated according to PDI data-triggered roughing second-level model, slab carries out total passage according to roughing rolling procedure For the operation of rolling of odd-numbered pass；
Step 3: most end passage starts, and rolled piece reaches the instrument group before roughing mill, obtains actual measurement rolled piece thickness average value, width Spend average value and surface temperature average value；The actual measurement rolled piece thickness average value, width average value and surface temperature average value point The sampled point average value of this passage thickness, width and surface temperature effective range Wei not met；The specific method is as follows:
Step 3.1: if the numerical value of the collected thickness sampled point of calibrator exceeds defined this passage thickness effective range, It then rejects, when effective sampling points counting reaches defined amount N, carries out step 3.2；
Step 3.2: average value processing being carried out to obtained effective thickness sampled value, actual measurement thickness average value is calculated as follows h0:
In formula, h0, iFor the thickness value of i-th of effective thickness sampled point, i=1,2,3 ..., N；
Step 3.3: if the numerical value of the collected width sampled point of temperature measurer exceeds defined this passage width effective range, It then rejects, when effective sampling points counting reaches defined amount N, carries out step 3.4；
Step 3.4: average value processing being carried out to obtained effective width sampled value, actual measurement width average value is calculated as follows w0:
In formula, w0, jFor the width value of j-th of effective width sampled point, j=1,2,3 ..., N；
Step 3.5: if the numerical value of the collected surface temperature sampled point of temperature measurer is effective beyond defined this passage temperature Range is then rejected, and when effective sampling points counting reaches defined amount N, carries out step 3.6；
Step 3.6: average value processing being carried out to obtained active surface temperature sampling value, actual measurement surface temperature is calculated as follows Average value T0:
In formula, T0, kFor the temperature value of k-th of active surface temperature sampling point, k=1,2,3 ..., N；
Step 4: rolled piece reaches contact in rolling, at the time of record rolled piece reaches contact in rolling, calculates rolled piece by thermometric Instrument obtains actual measurement roll-force average value, the speed of rolls average value of contact in rolling to the time of contact in rolling；The actual measurement Roll-force average value, speed of rolls average value respectively meet this passes power and the sampled point of speed of rolls effective range is flat Mean value；The specific method is as follows:
Step 4.1: workpiece front end is t at the time of reaching temperature measurerroll；
Step 4.2: if the numerical value of the collected roll-force sampled point of pressure sensor exceeds defined this passes power Effective range is then rejected, and when effective sampling points counting reaches defined amount N, carries out step 4.3；
Step 4.3: average value processing being carried out to obtained effective roll-force sampled value, it is average that actual measurement roll-force is calculated as follows Value P0:
In formula, P0, lFor the rolling force value of first of effective roughing outlet temperature sampled point, l=1,2,3 ..., N；
Step 4.4: if the numerical value of the collected speed of rolls sampled point of velocity sensor exceeds this defined pass speed Effective range is then rejected, and when effective sampling points counting reaches defined amount N, carries out step 4.5；
Step 4.5: average value processing being carried out to obtained effective speed of rolls sampled value, the actual measurement speed of rolls is calculated as follows Average value v:
In formula, vmFor the temperature value of m-th of effective roughing outlet temperature sampled point, m=1,2,3 ..., N；
Step 5: rolled piece reaches the instrument group after roughing mill, obtains actual measurement rolled piece thickness average value, width average value and table Face temperature averages；Workpiece front end is recorded at the time of exporting temperature measurer, calculates rolled piece by the time of deformed area to temperature measurer；Institute Stating actual measurement rolled piece thickness average value, width average value and surface temperature average value is respectively to meet this passage thickness, width and table The sampled point average value of face temperature effective range；The specific method is as follows:
Step 5.1: if the numerical value of the collected thickness sampled point of calibrator exceeds defined this passage thickness effective range, It then rejects, when effective sampling points counting reaches defined amount N, carries out step 5.2；
Step 5.2: average value processing being carried out to obtained effective thickness sampled value, actual measurement thickness average value is calculated as follows H1:
In formula, h1, nFor the thickness value of n-th of effective thickness sampled point, n=1,2,3 ..., N；
Step 5.3: if the numerical value of the collected width sampled point of temperature measurer exceeds defined this passage temperature effective range, It then rejects, when effective sampling points counting reaches defined amount N, carries out step 5.4；
Step 5.4: average value processing being carried out to obtained effective width sampled value, actual measurement width average value is calculated as follows w1:
In formula, w1, eFor the width value of e-th of effective width sampled point, e=1,2,3 ..., N；
Step 5.5: if the numerical value of the collected surface temperature sampled point of temperature measurer is effective beyond defined this passage temperature Range is then rejected, and when effective sampling points counting reaches defined amount N, carries out step 5.6；
Step 5.6: average value processing being carried out to obtained active surface temperature sampling value, actual measurement surface temperature is calculated as follows Average value T1:
In formula, T1, fFor the temperature value of f-th of active surface temperature sampling point, f=1,2,3 ..., N；
Step 5.7: record workpiece front end to t at the time of exporting temperature measurer1, calculate rolled piece by deformed area to temperature measurer when Between are as follows: τ1=t1-troll；
Step 6: rolled piece mean temperature when rolling deformation is calculated, center portion temperature of the rolled piece at outlet temperature measurer is calculated, Circular are as follows:
Step 6.1: according to the relationship between tube rolling simulation model and temperature, calculating deformation temperature of the rolled piece at deformed area Degree；
The calculation formula of roll-force P is as follows:
P=1.15KmlcQPB/1000
In formula, B is rolled piece width, mm；KmFor resistance of deformation, MPa is the function of deformation temperature, is shown below:
T is deformed area rolled piece mean temperature, K；lcContact arc length after being flattened for consideration, mm,R ' is to flatten Radius, mm,R is roller radius, mm；Δ h is drafts, mm, Δ h=h0-h1；QPTo answer Power state influences coefficient,hmIt is average for rolled piece Thickness, mm,For deformation extent, %, For rate of deformation, s-1,
Step 6.2: calculating air-cooled temperature drop of the rolled piece from deformed area to from outlet temperature measurer；
Mean temperature of the rolled piece in deformed area is calculated according to step 6.1 and is denoted as Troll, calculated according in step 5.7 The time of temperature measurer is exported as τ by deformed area to roughing to rolled piece1, reach the mean temperature at outlet temperature measurerBy following formula meter It obtains:
In formula, ε is thermal emissivity rate, ε=0.7；σ is Stefan-Boltzmann constant, σ=5.69 × 10-8W/(m2.K4)； C is rolled piece specific heat, J/kgK；γ is rolled piece density, kg/m3；
Step 6.3: rolled piece center portion temperature T is calculated according to the rolled piece mean temperature at outlet temperature measurerCore, 1:
Step 7: rolled piece reaches finish rolling entrance temperature measurer, obtains actual measurement rolled piece surface temperature average value；Record workpiece front end At the time of reaching finish rolling entrance temperature measurer, rolled piece is calculated by the time of roughing outlet temperature measurer to finish rolling entrance temperature measurer；It is described Actual measurement rolled piece surface temperature average value is respectively the temperature averages for meeting the sampled point of surface temperature effective range；Specific method Are as follows:
Step 7.1: if the numerical value of the collected thickness sampled point of temperature measurer exceeds defined temperature effective range, picking It removes, when effective sampling points counting reaches defined amount N, carries out step 7.2；
Step 7.2: average value processing being carried out to obtained effective temperature sampled value, it is average that actual measurement surface temperature is calculated as follows Value T2:
In formula, T2, qFor the temperature value of q-th of effective temperature sampled point, q=1,2,3 ..., N；
Step 7.3: t at the time of record workpiece front end reaches finish rolling entrance temperature measurer2, rolled piece is calculated and is exported by roughing Time of the temperature measurer to finish rolling entrance temperature measurer are as follows: τ2=t2-t1；
Step 8: calculating average surface temperature of the rolled piece at finish rolling entrance temperature measurer, the center portion temperature of intermediate base is calculated Degree, circular are as follows:
Step 8.1: calculating air-cooled temperature drop of the rolled piece from roughing outlet temperature measurer to finish rolling entrance；
Rolled piece is calculated in the mean temperature of deformed area according to step 6.2Be calculated in step 7.3 rolled piece by Roughing exports temperature measurer to the time τ of finish rolling entrance temperature measurer2, reach the mean temperature at finish rolling entrance temperature measurerBy following formula It is calculated:
Step 8.2: according to rolled piece mean temperature at finish rolling entrance temperature measurerRolled piece surface temperature at finish rolling entrance temperature measurer Spend T2, calculate the rolled piece center portion temperature T at finish rolling entrance temperature measurerCore, 2Are as follows:
The beneficial effects of adopting the technical scheme are that base center portion among a kind of hot continuous rolling provided by the invention Temperature computation method is calculated according to roll-force speed, the width and thickness that roughing area end rolling pass actual measurement obtains Rolled piece mean temperature obtains temperature drop of the rolled piece on conveyor roller by air-cooled warm extrusion die and loses, obtains the average temperature of rolled piece Degree further combines rolled piece in the surface temperature of any position of delay table, it can the center portion temperature of rolled piece is calculated Degree.The present invention safely can be high, and computational accuracy is high, can be successfully applied to the calculating process of base center portion temperature among continuous hot-rolling mill, Solve the problems, such as in real process intermediate base center portion temperature can not direct-on-line measurement, while saving investment of production cost, Guarantee the computational accuracy of temperature.The present invention is unrelated with the installation site of delay table temperature measurer, it is only necessary to be obtained using on-line measurement The center portion temperature of rolled piece can be calculated in the time that rolled piece is run at the temperature measurer, can effectively improve the temperature of intermediate base Forecast precision provides good basis for being precisely controlled online for finished product thickness.
Detailed description of the invention
Fig. 1 is rougher of hot strip mill area provided in an embodiment of the present invention capital equipment and instrument disposition figure；
Fig. 2 is rougher of hot strip mill area provided in an embodiment of the present invention end passes schematic diagram；
Fig. 3 is rolled piece internal temperature parabolic distribution schematic diagram provided in an embodiment of the present invention；
Fig. 4 is intermediate base center portion temperature computation flow chart provided in an embodiment of the present invention.
In figure, 1, heating furnace；2, calibrator before roughing mill；3, the first width gage；4, the first temperature measurer；5, roughing mills； 6, velocity sensor；7, pressure sensor；8, calibrator after roughing mill；9, the second width gage；10, the second temperature measurer；11, finish rolling Temperature measurer before machine；12, slab；13, intermediate base；14, mm finishing mill unit.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below Example is not intended to limit the scope of the invention for illustrating the present invention.
The present embodiment uses " edger roll+plain-barreled roll " arrangement form using typical hot continuous rolling production line roughing mills, roughing mills As shown in Figure 1, edger roll is in preceding, plain-barreled roll rear；Slab is heated to tapping temperature in heating furnace 1, and survey is disposed with before roughing mills 5 Thick instrument 2, width gage 3 and temperature measurer 4 are disposed with calibrator 8, width gage 9 and temperature measurer 10, the milling train in roughing mills 5 after machine On velocity sensor 6 and pressure sensor 7 are installed；It is the rolling process of rough rolling of odd-numbered pass by sum, obtains centre Base 13 finally reaches mm finishing mill unit 14 by finish rolling area entrance temperature measurer 11.
In rougher of hot strip mill area production process, calibrator measures rolled piece thickness, and width gage measures rolled piece width, temperature measurer Measure rolled piece surface temperature, the fortune of mill rolling force sensor measurement deformation of rolled wire process roll-force, velocity sensor measurement roll Scanning frequency degree.Calibrator after calibrator 2, width gage 3, temperature measurer 4, velocity sensor 6, pressure sensor 7, roughing mill before roughing mill 8, the measuring signal etc. that temperature measurer 11 generates before width gage 9, temperature measurer 10 and finishing mill is transferred to process by Basic automation level Grade is automated, entire intermediate base center portion temperature computation process is completed in process automation grade.Basic automation level and process are automatic The communication cycle for changing grade is 100ms, i.e., every 100ms obtains a sampled point；Rolled piece back and forth rolls in roughing area, and most end rolls road Secondary is odd-numbered pass.Rolled piece can be with to workpiece front end to deformed area, roughing outlet temperature measurer and at the time of finish rolling entrance temperature measurer It is recorded by process automation grade, as shown in Figure 2.
A kind of hot continuous rolling centre base center portion temperature computation method, as shown in figure 4, details are provided below.
Step 1: slab is come out of the stove, and obtains slab PDI data.
PDI data mainly include size of plate blank, intermediate base size, finished size, steel grade title and chemical component, this reality The PDI data applied in example are as shown in table 1.When slab is come out of the stove, PDI data are sent to rough rolling process control system.
1 PDI data of table
Serial number Content Numerical value Unit
1 Steel grade Q235B
2 Size of plate blank 7000×1000×180 mm×mm×mm
3 Intermediate base size 1050×35.0 mm×mm
4 Finished size 1050×3.50 mm×mm
5 Chemical element carbon 0.16 %
6 Chemical element silicon 0.19 %
7 Chemical element manganese 0.30 %
8 Chemical element chromium 0.10 %
9 Chemical element nickel 0.12 %
10 Chemical element phosphorus 0.03 %
11 Chemical element sulphur 0.03 %
Step 2: being calculated according to PDI data-triggered roughing setting up model, slab carries out total passage according to roughing rolling procedure For the operation of rolling of odd-numbered pass；
Step 3: most end passage starts, and rolled piece reaches the instrument group before roughing mill, obtains actual measurement rolled piece thickness average value, width Spend average value and surface temperature average value；The actual measurement rolled piece thickness average value, width average value and surface temperature average value point The sampled point average value of this passage thickness, width and surface temperature effective range Wei not met.
Step 3.1: if the numerical value of the collected thickness sampled point of calibrator exceeds defined this passage thickness effective range, It then rejects, when effective sampling points counting reaches defined amount N, carries out step 3.2；N takes 20 in the present embodiment；
Step 3.2: average value processing being carried out to obtained effective thickness sampled value, calculates actual measurement thickness average value；
Survey thickness average value h0:
In formula, h0, iFor the thickness value of i-th of effective thickness sampled point, i=1,2,3 ..., 20；
Step 3.3: if the numerical value of the collected width sampled point of temperature measurer exceeds defined this passage width effective range, It then rejects, when effective sampling points counting reaches defined amount (taking 20 herein), carries out step 3.4；
Step 3.4: average value processing being carried out to obtained effective width sampled value, calculates actual measurement width average value；
Survey width average value w0:
In formula, w0, jFor the width value of j-th of effective width sampled point, j=1,2,3 ..., 20；
Step 3.5: if the numerical value of the collected surface temperature sampled point of temperature measurer is effective beyond defined this passage temperature Range is then rejected, and when effective sampling points counting reaches defined amount (taking 20 herein), carries out step 3.6；
Step 3.6: average value processing being carried out to obtained active surface temperature sampling value, it is average to calculate actual measurement surface temperature Value；
Survey surface temperature average value T0:
In formula, T0, kFor the temperature value of k-th of active surface temperature sampling point, k=1,2,3 ..., 20；
Step 4: rolled piece reaches contact in rolling, at the time of record rolled piece reaches contact in rolling, calculates rolled piece by thermometric Instrument obtains actual measurement roll-force average value, the speed of rolls average value of contact in rolling to the time of contact in rolling；The actual measurement Roll-force average value, speed of rolls average value respectively meet this passes power and the sampled point of speed of rolls effective range is flat Mean value.
Step 4.1: workpiece front end is t at the time of reaching temperature measurerroll；
Step 4.2: if the numerical value of the collected roll-force sampled point of pressure sensor exceeds defined this passes power Effective range is then rejected, and when effective sampling points counting reaches defined amount (taking 20 herein), carries out step 4.3；
Step 4.3: average value processing being carried out to obtained effective roll-force sampled value, calculates actual measurement roll-force average value；
Survey roll-force average value P0:
In formula, P0, lFor the rolling force value of first of effective roughing outlet temperature sampled point, l=1,2,3 ..., 20；
Step 4.4: if the numerical value of the collected speed of rolls sampled point of velocity sensor exceeds this defined pass speed Effective range is then rejected, and when effective sampling points counting reaches defined amount (taking 20 herein), carries out step 4.5；
Step 4.5: average value processing being carried out to obtained effective speed of rolls sampled value, it is average to calculate the actual measurement speed of rolls Value；
Survey speed of rolls average value v:
In formula, vmFor the temperature value of m-th of effective roughing outlet temperature sampled point, m=1,2,3 ..., 20；
Step 5: instrument group of the rolled piece after roughing mill obtains actual measurement rolled piece thickness average value, width average value and table Face temperature averages；Workpiece front end is recorded at the time of exporting temperature measurer, calculates rolled piece by the time of deformed area to temperature measurer；Institute Stating actual measurement rolled piece thickness average value, width average value and surface temperature average value is respectively to meet this passage thickness, width and table The sampled point average value of face temperature effective range.
Step 5.1: if the numerical value of the collected thickness sampled point of calibrator exceeds defined this passage thickness effective range, It then rejects, when effective sampling points counting reaches defined amount (taking 20 herein), carries out step 5.2；
Step 5.2: average value processing being carried out to obtained effective thickness sampled value, calculates actual measurement thickness average value；
Survey thickness average value h1:
In formula, h1, nFor the thickness value of n-th of effective thickness sampled point, n=1,2,3 ..., 20；
Step 5.3: if the numerical value of the collected width sampled point of temperature measurer exceeds defined this passage temperature effective range, It then rejects, when effective sampling points counting reaches defined amount (taking 20 herein), carries out step 5.4；
Step 5.4: average value processing being carried out to obtained effective width sampled value, calculates actual measurement width average value；
Survey width average value w1:
In formula, w1, eFor the width value of e-th of effective width sampled point, e=1,2,3 ..., 20；
Step 5.5: if the numerical value of the collected surface temperature sampled point of temperature measurer is effective beyond defined this passage temperature Range is then rejected, and when effective sampling points counting reaches defined amount (taking 20 herein), carries out step 5.6；
Step 5.6: average value processing being carried out to obtained active surface temperature sampling value, it is average to calculate actual measurement surface temperature Value；
Survey surface temperature average value T1:
In formula, T1, fFor the temperature value of f-th of active surface temperature sampling point, f=1,2,3 ..., 20；
Step 5.7: record workpiece front end to t at the time of exporting temperature measurer1, calculate rolled piece by deformed area to temperature measurer when Between are as follows:
t1-trol1=2.2s
Step 6: calculating rolled piece mean temperature when rolling deformation, calculate center portion temperature of the rolled piece at outlet temperature measurer；
Step 6.1: according to the relationship between tube rolling simulation model and temperature, calculating deformation temperature of the rolled piece at deformed area Degree；Wherein, resistance of deformation KmIt is the function of deformation temperature.
The calculation formula of roll-force P is as follows:
P=1.15KmlcQPB/1000
In formula: B- rolled piece width, mm；
KmResistance of deformation, MPa:
The deformed area T- rolled piece mean temperature, K；
lcConsider the contact arc length after flattening, mm；
R '-flattens radius, mm；
R- roller radius, mm；
Δ h- drafts, mm；
Δ h=h0-h1；
QPInfluential coefficient in stressed state:
hmRolled piece average thickness, mm；
R- deformation extent, %；
Rate of deformation, s-1；
By solving, the mean temperature for obtaining deformed area is 1158.15K.Roughing extreme trace time calculating data such as 2 institute of table Show, shown in roughing extreme trace time deformation parameter table 3.
2 roughing extreme trace time of table, which calculates, uses data
Parameter name Unit Numerical value
Inlet thickness mm 51.2
Exit thickness mm 35.1
Throat width mm 1250.1
Exit width mm 1251.2
Inlet temperature K 1370.25
Outlet temperature K 1345.55
Roll-force kN 17094.04
Mill speed m/s 3.3
Roller radius mm 450
3 roughing extreme trace time deformation parameter of table
Step 6.2: calculating air-cooled temperature drop of the rolled piece from deformed area to from outlet temperature measurer；
In rolled piece operational process, rolled piece temperature is high in rough rolling process, and the heat of radiation loss is damaged considerably beyond free convection It loses and the contact heat loss with roller-way, therefore need to only consider the influence of heat radiation during warm extrusion die.
It is 1358.35K that mean temperature of the rolled piece in deformed area, which is calculated, according to step 6.1, is denoted as Troll；According to step It is τ that rolled piece is calculated in 5.7 by the time of deformed area to roughing outlet temperature measurer1=t1-troll=2.2s:
Reach the mean temperature at outlet temperature measurerIt is calculated by following formula:
In formula: ε is thermal emissivity rate, ε=0.7；σ is Stefan-Boltzmann constant, σ=5.69 × 10-8W/(m2· K4)；C is rolled piece specific heat, J/kgK；γ is rolled piece density, kg/m3；
Step 6.3: rolled piece center portion temperature is calculated according to the rolled piece mean temperature at outlet temperature measurer；
Inside strip, temperature is parabolically distributed from center to face, as shown in Figure 3.Center portion temperature TcoreCalculating Formula are as follows:
Therefore, mean temperatureSurface temperature Tm=T1=1345.55K, roughing export temperature measurer The rolled piece center portion temperature T at placeCore, 1Are as follows:
Step 7: rolled piece reaches finish rolling entrance temperature measurer, obtains actual measurement rolled piece surface temperature average value；Record workpiece front end At the time of reaching finish rolling entrance temperature measurer, rolled piece is calculated by the time of roughing outlet temperature measurer to finish rolling entrance temperature measurer；It is described Actual measurement rolled piece surface temperature average value is respectively the temperature averages for meeting the sampled point of surface temperature effective range.
Step 7.1: if the numerical value of the collected thickness sampled point of temperature measurer exceeds defined temperature effective range, picking It removes, when effective sampling points counting reaches defined amount (taking 20 herein), carries out step 7.2；
Step 7.2: average value processing being carried out to obtained effective temperature sampled value, calculates actual measurement surface temperature average value；
Survey surface temperature average value T2:
In formula, T2, qFor the temperature value of q-th of effective temperature sampled point, q=1,2,3 ..., 20；
Step 7.3: t at the time of record workpiece front end reaches finish rolling entrance temperature measurer2, rolled piece is calculated and is exported by roughing Time of the temperature measurer to finish rolling entrance temperature measurer are as follows:
τ2=t2-t1=15.3s
Step 8: calculating average surface temperature of the rolled piece at finish rolling entrance temperature measurer, the center portion temperature of intermediate base is calculated Degree；
Step 8.1: calculating air-cooled temperature drop of the rolled piece from roughing outlet temperature measurer to finish rolling entrance；
Mean temperature of the rolled piece in deformed area, which is calculated, according to step 6.2 isAccording in step 7.3 It is τ that rolled piece, which is calculated, by the time that roughing exports temperature measurer to finish rolling entrance temperature measurer2=t2-t1=15.3s:
Reach the mean temperature at finish rolling entrance temperature measurerIt is calculated by following formula:
Step 8.2: repeating step 6.3 and calculate center portion temperature；
Rolled piece mean temperature at finish rolling entrance temperature measurerRolled piece surface at finish rolling entrance temperature measurer Temperature Tm=T2=1301.75K, the rolled piece center portion temperature T at finish rolling entrance temperature measurerCore, 2Are as follows:
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used To modify to technical solution documented by previous embodiment, or some or all of the technical features are equal Replacement；And these are modified or replaceed, model defined by the claims in the present invention that it does not separate the essence of the corresponding technical solution It encloses.

Claims (7)

1. base center portion temperature computation method among a kind of hot continuous rolling, it is characterised in that: the following steps are included:
Step 1: slab is come out of the stove, and obtains slab PDI data；
Step 2: being calculated according to PDI data-triggered roughing second-level model, it is surprise that slab, which carries out total passage according to roughing rolling procedure, The operation of rolling of several time；
Step 3: most end passage starts, and rolled piece reaches the instrument group before roughing mill, and it is flat to obtain actual measurement rolled piece thickness average value, width Mean value and surface temperature average value；The actual measurement rolled piece thickness average value, width average value and surface temperature average value are respectively Meet the sampled point average value of this passage thickness, width and surface temperature effective range；
Step 4: rolled piece reach contact in rolling, record rolled piece reach contact in rolling at the time of, calculate rolled piece by temperature measurer to The time of contact in rolling obtains actual measurement roll-force average value, the speed of rolls average value of contact in rolling；The actual measurement rolling Power average value, speed of rolls average value respectively meet this passes power and the sampled point of speed of rolls effective range is average Value；
Step 5: rolled piece reaches the instrument group after roughing mill, obtains actual measurement rolled piece thickness average value, width average value and surface temperature Spend average value；Workpiece front end is recorded at the time of exporting temperature measurer, calculates rolled piece by the time of deformed area to temperature measurer；The reality Surveying rolled piece thickness average value, width average value and surface temperature average value is respectively to meet this passage thickness, width and surface temperature Spend the sampled point average value of effective range；
Step 6: calculating rolled piece mean temperature when rolling deformation, calculate center portion temperature of the rolled piece at outlet temperature measurer；
Step 7: rolled piece reaches finish rolling entrance temperature measurer, obtains actual measurement rolled piece surface temperature average value；Workpiece front end is recorded to reach At the time of finish rolling entrance temperature measurer, rolled piece is calculated by the time of roughing outlet temperature measurer to finish rolling entrance temperature measurer；The actual measurement Rolled piece surface temperature average value is respectively the temperature averages for meeting the sampled point of surface temperature effective range；
Step 8: calculating average surface temperature of the rolled piece at finish rolling entrance temperature measurer, the center portion temperature of intermediate base is calculated.
2. base center portion temperature computation method among hot continuous rolling according to claim 1, it is characterised in that: the step 3 The specific method is as follows:
Step 3.1: if the numerical value of the collected thickness sampled point of calibrator exceeds defined this passage thickness effective range, picking It removes, when effective sampling points counting reaches defined amount N, carries out step 3.2；
Step 3.2: average value processing being carried out to obtained effective thickness sampled value, actual measurement thickness average value h is calculated as follows0:
In formula, h0, iFor the thickness value of i-th of effective thickness sampled point, i=1,2,3 ..., N；
Step 3.3: if the numerical value of the collected width sampled point of temperature measurer exceeds defined this passage width effective range, picking It removes, when effective sampling points counting reaches defined amount N, carries out step 3.4；
Step 3.4: average value processing being carried out to obtained effective width sampled value, actual measurement width average value w is calculated as follows0:
In formula, w0, jFor the width value of j-th of effective width sampled point, j=1,2,3 ..., N；
Step 3.5: if the numerical value of the collected surface temperature sampled point of temperature measurer exceeds defined this passage temperature effective range, It then rejects, when effective sampling points counting reaches defined amount N, carries out step 3.6；
Step 3.6: average value processing being carried out to obtained active surface temperature sampling value, it is average that actual measurement surface temperature is calculated as follows Value T0；
In formula, T0, kFor the temperature value of k-th of active surface temperature sampling point, k=1,2,3 ..., N.
3. base center portion temperature computation method among hot continuous rolling according to claim 2, it is characterised in that: the step 4 The specific method is as follows:
Step 4.1: workpiece front end is t at the time of reaching temperature measurerroll；
Step 4.2: if the numerical value of the collected roll-force sampled point of pressure sensor is effective beyond defined this passes power Range is then rejected, and when effective sampling points counting reaches defined amount N, carries out step 4.3；
Step 4.3: average value processing being carried out to obtained effective roll-force sampled value, actual measurement roll-force average value P is calculated as follows0:
In formula, P0, lFor the rolling force value of first of effective roughing outlet temperature sampled point, l=1,2,3 ..., N；
Step 4.4: if the numerical value of the collected speed of rolls sampled point of velocity sensor is effective beyond this defined pass speed Range is then rejected, and when effective sampling points counting reaches defined amount N, carries out step 4.5；
Step 4.5: average value processing being carried out to obtained effective speed of rolls sampled value, it is average that the actual measurement speed of rolls is calculated as follows Value v:
In formula, vmFor the temperature value of m-th of effective roughing outlet temperature sampled point, m=1,2,3 ..., N.
4. base center portion temperature computation method among hot continuous rolling according to claim 3, it is characterised in that: the step 5 The specific method is as follows:
Step 5.1: if the numerical value of the collected thickness sampled point of calibrator exceeds defined this passage thickness effective range, picking It removes, when effective sampling points counting reaches defined amount N, carries out step 5.2；
Step 5.2: average value processing being carried out to obtained effective thickness sampled value, actual measurement thickness average value h is calculated as follows1:
In formula, h1, nFor the thickness value of n-th of effective thickness sampled point, n=1,2,3 ..., N；
Step 5.3: if the numerical value of the collected width sampled point of temperature measurer exceeds defined this passage temperature effective range, picking It removes, when effective sampling points counting reaches defined amount N, carries out step 5.4；
Step 5.4: average value processing being carried out to obtained effective width sampled value, actual measurement width average value w is calculated as follows1:
In formula, w1, eFor the width value of e-th of effective width sampled point, e=1,2,3 ..., N；
Step 5.5: if the numerical value of the collected surface temperature sampled point of temperature measurer exceeds defined this passage temperature effective range, It then rejects, when effective sampling points counting reaches defined amount N, carries out step 5.6；
Step 5.6: average value processing being carried out to obtained active surface temperature sampling value, it is average that actual measurement surface temperature is calculated as follows Value T1:
In formula, T1, fFor the temperature value of f-th of active surface temperature sampling point, f=1,2,3 ..., N；
Step 5.7: record workpiece front end to t at the time of exporting temperature measurer1, rolled piece is calculated by the time of deformed area to temperature measurer are as follows: τ1=t1-troll。
5. base center portion temperature computation method among hot continuous rolling according to claim 4, it is characterised in that: the step 6 Circular are as follows:
Step 6.1: according to the relationship between tube rolling simulation model and temperature, calculating deformation temperature of the rolled piece at deformed area；
The calculation formula of roll-force P is as follows:
P=1.15KmlcQPB/1000
In formula, B is rolled piece width, mm；KmFor resistance of deformation, MPa is the function of deformation temperature, is shown below:
T is deformed area rolled piece mean temperature, K；lcContact arc length after being flattened for consideration, mm,R ' is to flatten radius, Mm,R is roller radius, mm；Δ h is drafts, mm, Δ h=h0-h1；QPFor stress state Coefficient is influenced,hmFor rolled piece average thickness, Mm,For deformation extent, %, For rate of deformation, s-1,
Step 6.2: calculating air-cooled temperature drop of the rolled piece from deformed area to from outlet temperature measurer；
Mean temperature of the rolled piece in deformed area is calculated according to step 6.1 and is denoted as Troll, rolled according to being calculated in step 5.7 Part is τ by the time of deformed area to roughing outlet temperature measurer1, reach the mean temperature at outlet temperature measurerIt is calculated by following formula It arrives:
In formula, ε is thermal emissivity rate, ε=0.7；σ is Stefan-Boltzmann constant, σ=5.69 × 10-8W/(m2·K4)；C is Rolled piece specific heat, J/kgK；γ is rolled piece density, kg/m3；
Step 6.3: rolled piece center portion temperature T is calculated according to the rolled piece mean temperature at outlet temperature measurerCore, 1:
6. base center portion temperature computation method among hot continuous rolling according to claim 5, it is characterised in that: the step 7 Method particularly includes:
Step 7.1: if the numerical value of the collected thickness sampled point of temperature measurer exceeds defined temperature effective range, reject, when When effective sampling points counting reaches defined amount N, step 7.2 is carried out；
Step 7.2: average value processing being carried out to obtained effective temperature sampled value, actual measurement surface temperature average value T is calculated as follows2:
In formula, T2, qFor the temperature value of q-th of effective temperature sampled point, q=1,2,3 ..., N；
Step 7.3: t at the time of record workpiece front end reaches finish rolling entrance temperature measurer2, rolled piece is calculated by roughing and exports thermometric Time of the instrument to finish rolling entrance temperature measurer are as follows: τ2=t2-t1。
7. base center portion temperature computation method among hot continuous rolling according to claim 6, it is characterised in that: the step 8 Circular are as follows:
Step 8.1: calculating air-cooled temperature drop of the rolled piece from roughing outlet temperature measurer to finish rolling entrance；
Rolled piece is calculated in the mean temperature of deformed area according to step 6.2Rolled piece is calculated in step 7.3 to be gone out by roughing Time τ of the mouth temperature measurer to finish rolling entrance temperature measurer2, reach the mean temperature at finish rolling entrance temperature measurerIt is calculated by following formula It arrives:
Step 8.2: according to rolled piece mean temperature at finish rolling entrance temperature measurerRolled piece surface temperature T at finish rolling entrance temperature measurer2, Calculate the rolled piece center portion temperature T at finish rolling entrance temperature measurerCore, 2Are as follows:
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