CN113449239A - Method for forecasting influence of single factor of fan pressure on surface of strip steel of aluminum-zinc plating unit on C warp - Google Patents
Method for forecasting influence of single factor of fan pressure on surface of strip steel of aluminum-zinc plating unit on C warp Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 222
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- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 238000007747 plating Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims description 19
- 238000000137 annealing Methods 0.000 claims abstract description 132
- 239000000112 cooling gas Substances 0.000 claims abstract description 66
- 239000000463 material Substances 0.000 claims abstract description 19
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- 238000013277 forecasting method Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 120
- 239000004576 sand Substances 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims 1
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- 239000007789 gas Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical group [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 230000002708 enhancing effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Abstract
The invention relates to a forecasting method for influence of single factor of fan pressure on the surface of strip steel of an aluminum-zinc plating unit on C warp, which comprises the following steps: A) collecting key equipment parameters in a continuous annealing furnace of the aluminum-zinc plating unit; B) collecting material characteristic parameters of the strip steel; C) calculating the modulus of elasticity reduction coefficient of the material at high temperature; D) calculating the elastic modulus of the strip steel at high temperature; E) calculating the flow velocity of cooling gas on the upper surface and the lower surface of the strip steel; F) calculating the pressure difference between the upper surface and the lower surface of the strip steel under the action of the fan; G) calculating the maximum deflection deformation of any unit of the strip steel in the continuous annealing furnace; H) calculating the maximum deflection deformation of the strip steel; I) outputting the warping amount generated by the pressure difference of fans on the upper surface and the lower surface of the strip steel; the invention effectively solves the problem of predicting the warping of the strip steel in the continuous annealing furnace under the action of the fan pressure, and provides a foundation for the fan pressure treatment technology of the shape of the aluminum-zinc plating unit.
Description
Technical Field
The invention relates to a forecasting method, in particular to a forecasting method for the influence of a single factor of fan pressure on the surface of strip steel of an aluminum-zinc plating unit on C warp, and belongs to the technical field of temperature control in a continuous annealing furnace in a steel rolling process.
Background
In the production process of the hot-dip aluminum-zinc unit, the strip steel needs to be cooled by an air-jet cooling device (a fan for short), and an air-jet cooling circulating system comprises a spray box with a nozzle, a protective gas circulating fan and a protective gas heat exchanger. The protective gas in the furnace circulates through a circulating fan, and is blown to the strip steel from two sides at high speed through a nozzle of a spray box after being cooled by a gas heat exchanger. The spray box is longitudinally divided into 3 areas to ensure the uniform temperature of the strip steel, and the gas flow of each area is adjusted by a baffle. In the continuous annealing process production of the aluminum-zinc plating unit, the gas pressure on the upper surface and the lower surface of the strip steel is not uniformly distributed, so that the gas pressure on each point is not equal everywhere. The uneven pressure distribution on the upper surface and the lower surface of the strip steel can cause different deflection deformation of the strip steel at all positions, so that transverse warping along the width of the strip steel often occurs in the continuous annealing process of the strip steel. Therefore, a new solution to solve the above technical problems is urgently needed.
Disclosure of Invention
The invention provides a method for forecasting the influence of single factor of fan pressure on the surface of strip steel of an aluminum-zinc plating unit on C warping, aiming at the problems in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for forecasting influence of single factor of fan pressure on the surface of strip steel of an aluminum-zinc plating unit on C warp is disclosed, and the method comprises the following steps:
A) collecting key equipment parameters in a continuous annealing furnace of the aluminum-zinc plating unit, including the flow velocity u of cooling gas at the outlet of a fan on the upper surface of the strip steel in the continuous annealing furnacesAnd the flow velocity u of cooling gas at the outlet of the fan on the lower surface of the strip steel in the continuous annealing furnacexOutlet pressure p of fan on upper surface of strip steel in cooling section of continuous annealing furnacesAnd the outlet pressure p of the fan on the lower surface of the strip steel of the cooling section in the continuous annealing furnacexContinuous annealing furnace temperature TcDensity rho of cooling gas in cooling section of continuous annealing furnace, length s of nozzle of fan in cooling section of continuous annealing furnace, and characteristic parameter a (by-spraying) of fan in cooling section of annealing furnaceDetermined by the equipment characteristics of the jet cooling device), the height H from a fan nozzle of a cooling section in the continuous annealing furnace to the surface of the strip steel, and the width b of the fan nozzle of the cooling section in the continuous annealing furnace;
B) collecting material characteristic parameters of the strip steel, including the elastic modulus E of the strip steel at normal temperature and the furnace roller distance l of a cooling section in the continuous annealing furnace0The thickness h of incoming strip steel;
C) calculating the modulus of elasticity and the reduction coefficient chi of the material at high temperatureT：
In the formula, xT-the modulus of elasticity reduction factor of the steel at high temperature;
Tc-temperature in the continuous annealing furnace (deg.c);
D) calculating the modulus of elasticity E of the strip steel at high temperatureT：
ET＝χTE
In the formula, ETTemperature TcInitial modulus of elasticity (N/mm) of steel material2)；
E-modulus of elasticity (N/mm) of Steel at Normal temperature2)；
E) Calculating the flow velocity of cooling gas on the upper surface and the lower surface of the strip steel:
in the formula ums-the flow rate of cooling gas on the upper surface of the strip steel in the cooling section of the furnace;
umx-the flow rate of cooling gas on the lower surface of the strip steel in the cooling section of the furnace;
us-the flow rate of cooling gas at the fan outlet on the upper surface of the strip steel in the cooling section of the furnace;
ux-the flow rate of cooling gas at the fan outlet on the lower surface of the strip steel in the cooling section of the furnace;
s is the length of a fan nozzle at a cooling section in the continuous annealing furnace;
a-fan characteristic parameters of a cooling section in a furnace;
b-the width of a fan nozzle of a cooling section in the continuous annealing furnace;
F) calculating the pressure difference between the upper surface and the lower surface of the strip steel under the action of the fan:
in the formula, pms-the pressure of the upper surface of the strip steel of the cooling section in the continuous annealing furnace;
pmx-pressure of the lower surface of the strip steel of the cooling section in the continuous annealing furnace;
delta p is the pressure difference between the upper surface and the lower surface of the strip steel under the action of the fan;
ums-cooling gas flow rate on the upper surface of the strip steel;
umx-the flow rate of cooling gas on the lower surface of the strip steel;
us-the flow rate of cooling gas at the outlet of the fan on the upper surface of the strip steel in the continuous annealing furnace;
ux-the flow rate of cooling gas at the outlet of the fan on the lower surface of the strip steel in the continuous annealing furnace;
ps-the pressure at the outlet of the fan at the cooling section in the continuous annealing furnace;
px-the pressure at the outlet of the fan at the cooling section in the continuous annealing furnace;
h, the height from a fan nozzle of a cooling section in the continuous annealing furnace to the surface of the strip steel;
G) calculating the maximum deflection deformation of any unit of the strip steel in the continuous annealing furnace:
wherein, Deltax is the unit strip steel width;
l0-cooling section furnace roller spacing;
Δqei-strip steel ith cell pressure;
FRireaction of the furnace roller to the i-th cell；
FSi-shear of the ith cell;
Mi-torque of the ith unit;
wyi-the amount of deflection of the ith cell along the y-axis;
wmaxi-the maximum deflection of the ith unit;
H) calculating the maximum deflection deformation of the strip steel:
wmax＝k·max{wmax1,...,wmaxi,...,wmax2n+1}
in the formula, wmax-maximum deflection of the strip steel;
k is a working condition correction coefficient, and k is 0.259;
I) and outputting the warping amount generated by the single-factor difference of the fan pressure of the upper surface and the lower surface of the strip steel, and completing the forecasting of the influence of the single-factor of the fan pressure of the surface of the strip steel of the aluminum-zinc plating unit on the C warping.
Compared with the prior art, the invention has the following advantages: 1) according to the invention, the equipment characteristics of the aluminum-zinc plating unit can be fully combined according to the field production condition of the cold-rolled strip steel, and the problem of the prediction of the warping of the strip steel in the continuous annealing furnace caused by the action of the fan pressure is effectively solved by collecting the equipment parameters of the fans on the upper surface and the lower surface of the strip steel at the cooling section in the continuous annealing furnace of the unit, so that a foundation is provided for the plate-shaped fan pressure treatment technology of the aluminum-zinc plating unit; the influence of the fan pressure on the surface of the strip steel on the C warping is only related to a single factor of pressure, and the influence of the temperature in a furnace on the warping of the strip steel is not related; 2) the pressure of an annealing cooling fan is optimized and set by the method, the C warping defect of the aluminum-zinc plating unit is effectively improved, the warping amount of a thick aluminum-zinc plating steel plate represented by a specification of 2.0 x 1250mm after annealing can reach a level of 12-19mm, the slag bonding at the edge of the strip steel is basically not influenced, and the continuous zinc slag at the edge of the strip steel is thoroughly eliminated.
Drawings
FIG. 1 is a schematic diagram of the division of a strip steel unit at a cooling section in a continuous annealing furnace;
FIG. 2 is a flow chart of the calculation of the present invention.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1, a method for forecasting influence of single factor of fan pressure on C warp on the surface of strip steel of an aluminum-zinc plating unit comprises the following steps:
A) collecting key equipment parameters in a continuous annealing furnace of the aluminum-zinc plating unit, including the flow velocity u of cooling gas at the outlet of a fan on the upper surface of the strip steel in the continuous annealing furnacesAnd the flow velocity u of cooling gas at the outlet of the fan on the lower surface of the strip steel in the continuous annealing furnacexOutlet pressure p of fan on upper surface of strip steel in cooling section of continuous annealing furnacesAnd the outlet pressure p of the fan on the lower surface of the strip steel of the cooling section in the continuous annealing furnacexContinuous annealing furnace temperature TcThe density rho of cooling gas at a cooling section in the continuous annealing furnace, the length s of a fan nozzle at the cooling section in the continuous annealing furnace, the fan characteristic parameter a (determined by the equipment characteristics of a jet cooling device) of the cooling section in the annealing furnace, the height H from the fan nozzle at the cooling section in the continuous annealing furnace to the surface of the strip steel and the width b of the fan nozzle at the cooling section in the continuous annealing furnace;
B) collecting material characteristic parameters of the strip steel, including the elastic modulus E of the strip steel at normal temperature and the furnace roller distance l of a cooling section in the continuous annealing furnace0The thickness h of incoming strip steel;
C) calculating the modulus of elasticity and the reduction coefficient chi of the material at high temperatureT：
In the formula, xT-the modulus of elasticity reduction factor of the steel at high temperature;
Tc-temperature in the continuous annealing furnace (deg.c);
D) calculating the modulus of elasticity E of the strip steel at high temperatureT：
ET＝χTE
In the formula, ETTemperature TcInitial modulus of elasticity (N/mm) of steel material2)；
E-modulus of elasticity (N/mm) of Steel at Normal temperature2)；
E) Calculating the flow velocity of cooling gas on the upper surface and the lower surface of the strip steel:
in the formula ums-the flow rate of cooling gas on the upper surface of the strip steel in the cooling section of the furnace;
umx-the flow rate of cooling gas on the lower surface of the strip steel in the cooling section of the furnace;
us-the flow rate of cooling gas at the fan outlet on the upper surface of the strip steel in the cooling section of the furnace;
ux-the flow rate of cooling gas at the fan outlet on the lower surface of the strip steel in the cooling section of the furnace;
s is the length of a fan nozzle at a cooling section in the continuous annealing furnace;
a-fan characteristic parameters of a cooling section in a furnace;
b-the width of a fan nozzle of a cooling section in the continuous annealing furnace;
F) calculating the pressure difference between the upper surface and the lower surface of the strip steel under the action of the fan:
in the formula, pms-the pressure of the upper surface of the strip steel of the cooling section in the continuous annealing furnace;
pmx-pressure of the lower surface of the strip steel of the cooling section in the continuous annealing furnace;
delta p is the pressure difference between the upper surface and the lower surface of the strip steel under the action of the fan;
ums-cooling gas flow rate on the upper surface of the strip steel;
umx-the flow rate of cooling gas on the lower surface of the strip steel;
us-the flow rate of cooling gas at the outlet of the fan on the upper surface of the strip steel in the continuous annealing furnace;
ux-the flow rate of cooling gas at the outlet of the fan on the lower surface of the strip steel in the continuous annealing furnace;
ps-in a continuous annealing furnaceCooling section fan outlet pressure;
px-the pressure at the outlet of the fan at the cooling section in the continuous annealing furnace;
h, the height from a fan nozzle of a cooling section in the continuous annealing furnace to the surface of the strip steel; G) calculating the maximum deflection deformation of any unit of the strip steel in the continuous annealing furnace:
wherein, Deltax is the unit strip steel width;
l0-cooling section furnace roller spacing;
Δqei-strip steel ith cell pressure;
FRithe support reaction force of the furnace roller to the unit i;
FSi-shear of the ith cell;
Mi-torque of the ith unit;
wyi-the amount of deflection of the ith cell along the y-axis;
wmaxi-the maximum deflection of the ith unit;
H) calculating the maximum deflection deformation of the strip steel:
wmax＝k·max{wmax1,...,wmaxi,...,wmax2n+1}
in the formula, wmax-maximum deflection of the strip steel;
k is a working condition correction coefficient, and k is 0.259;
I) and outputting the warping amount generated by the single-factor difference of the fan pressure of the upper surface and the lower surface of the strip steel, and completing the forecasting of the influence of the single-factor of the fan pressure of the surface of the strip steel of the aluminum-zinc plating unit on the C warping.
Application example 1: referring to fig. 1 and 2, a method for forecasting influence of single factor of fan pressure on C warp on the surface of strip steel of an aluminum-zinc plating unit comprises the following steps:
firstly, in the step A), collecting key equipment parameters in a continuous annealing furnace of the aluminum-zinc plating unit, including the upper surface of strip steel in the continuous annealing furnaceFlow velocity u of cooling gas at outlet of surface fans65m/s, and the flow velocity u of cooling gas at the outlet of the fan on the lower surface of the strip steel in the continuous annealing furnacex45.5m/s, and the outlet pressure p of the fan on the upper surface of the strip steel of the cooling section in the continuous annealing furnaces1000Pa, and the outlet pressure p of the fan on the lower surface of the strip steel of the cooling section in the continuous annealing furnacex1100Pa, and cooling gas density rho of cooling section in continuous annealing furnace is 1.3kg/m3The length s of a fan nozzle at a cooling section in the continuous annealing furnace is 8mm, the fan characteristic parameter a of the cooling section in the annealing furnace is 0.11, the height H from the fan nozzle at the cooling section in the continuous annealing furnace to the surface of the strip steel is 1.2m, the width b of the fan nozzle at the cooling section in the continuous annealing furnace is 0.75mm, and the temperature T in the continuous annealing furnacec＝200℃；
Then in the step B), collecting material characteristic parameters of the strip steel, including the elastic modulus E of the strip steel at normal temperature being 212GPa, and the furnace roller spacing l of the cooling section in the continuous annealing furnace0The thickness h of the incoming strip steel is 10m and 0.5 mm;
subsequently, in step C), the modulus of elasticity, chi, of the material at high temperature is calculatedT：
In the formula, xT-the modulus of elasticity reduction factor of the steel at high temperature;
Tc-the temperature (deg.C) in the continuous annealing furnace;
subsequently, in a step D), the modulus of elasticity E of the strip at high temperature is calculatedT：
ET＝χTE
In the formula, ETTemperature TcInitial modulus of elasticity (N/mm) of steel material2)；
E-modulus of elasticity (N/mm) of Steel at Normal temperature2)；
Then in step E), calculating the flow rate of cooling gas on the upper surface and the lower surface of the strip steel:
in the formula ums-the flow rate of cooling gas on the upper surface of the strip steel in the cooling section of the furnace;
umx-the flow rate of cooling gas on the lower surface of the strip steel in the cooling section of the furnace;
us-the flow rate of cooling gas at the fan outlet on the upper surface of the strip steel in the cooling section of the furnace;
ux-the flow rate of cooling gas at the fan outlet on the lower surface of the strip steel in the cooling section of the furnace;
s is the length of a fan nozzle at a cooling section in the continuous annealing furnace;
a-fan characteristic parameters of a cooling section in a furnace;
b-the width of a fan nozzle of a cooling section in the continuous annealing furnace;
calculating the cooling gas flow velocity u on the upper surface of the strip steel of the cooling section in the furnacems62.4m/s, the flow velocity u of cooling gas on the lower surface of the strip steel in the cooling section in the furnacemx＝43.68m/s；
And then in step F), calculating the pressure difference between the upper surface and the lower surface of the strip steel under the action of a fan:
in the formula, pms-the pressure of the upper surface of the strip steel of the cooling section in the continuous annealing furnace;
pmx-pressure of the lower surface of the strip steel of the cooling section in the continuous annealing furnace;
delta p is the pressure difference between the upper surface and the lower surface of the strip steel under the action of the fan;
ums-cooling gas flow rate on the upper surface of the strip steel;
umx-the flow rate of cooling gas on the lower surface of the strip steel;
us-the flow rate of cooling gas at the outlet of the fan on the upper surface of the strip steel in the continuous annealing furnace;
ux-the flow rate of cooling gas at the outlet of the fan on the lower surface of the strip steel in the continuous annealing furnace;
ps-the pressure at the outlet of the fan at the cooling section in the continuous annealing furnace;
px-the pressure at the outlet of the fan at the cooling section in the continuous annealing furnace;
h, the height from a fan nozzle of a cooling section in the continuous annealing furnace to the surface of the strip steel;
calculating the pressure p on the upper surface of the strip steel in the cooling section of the continuous annealing furnacems1200Pa, the pressure p of the lower surface of the strip steel of the cooling section in the continuous annealing furnacemx1190Pa, and 10Pa for the pressure difference delta p between the upper surface and the lower surface of the strip steel under the action of the fan;
then in step G), calculating the maximum deflection deformation of any unit of the strip steel in the continuous annealing furnace:
wherein, Deltax is the unit strip steel width;
l0-cooling section furnace roller spacing;
Δqei-strip steel ith cell pressure;
FRithe support reaction force of the furnace roller to the unit i;
FSi-shear of the ith cell;
Mi-torque of the ith unit;
wyi-the amount of deflection of the ith cell along the y-axis;
wmaxi-the maximum deflection of the ith unit;
subsequently, in step H), the maximum deflection of the strip is calculated:
wmax＝k·max{wmax1,...,wmaxi,...,wmax2n+1}
in the formula, wmax-maximum deflection of the strip steel;
k is a working condition correction coefficient, and k is 0.259;
and finally, in the step I), outputting the warping amount generated by the single-factor difference of the fan pressure of the upper surface and the lower surface of the strip steel, and completing the forecasting of the influence of the single-factor of the fan pressure of the surface of the strip steel of the aluminum-zinc plating unit on the C warping.
TABLE 1 comparison of predicted and actual values of warpage of strip steel in example 1
Application example 2: referring to fig. 1 and 2, a method for forecasting influence of single factor of fan pressure on C warp on the surface of strip steel of an aluminum-zinc plating unit comprises the following steps:
firstly, in the step A), collecting key equipment parameters in a continuous annealing furnace of the aluminum-zinc plating unit, including the flow velocity u of cooling gas at the outlet of a fan on the upper surface of the strip steel in the continuous annealing furnaces60m/s, and the flow velocity u of cooling gas at the outlet of the fan on the lower surface of the strip steel in the continuous annealing furnacex40.5m/s, and the outlet pressure p of the fan on the upper surface of the strip steel of the cooling section in the continuous annealing furnaces1200Pa, outlet pressure p of fan on lower surface of strip steel of cooling section in continuous annealing furnacex1350Pa, and cooling gas density rho of cooling section in continuous annealing furnace is 1.3kg/m3The length s of a fan nozzle at a cooling section in the continuous annealing furnace is 8mm, the fan characteristic parameter a of the cooling section in the annealing furnace is 0.11, the height H from the fan nozzle at the cooling section in the continuous annealing furnace to the surface of the strip steel is 1.2m, the width b of the fan nozzle at the cooling section in the continuous annealing furnace is 0.75mm, and the temperature T in the continuous annealing furnacec＝200℃；
Then in the step B), collecting material characteristic parameters of the strip steel, including the elastic modulus E of the strip steel at normal temperature being 212GPa, and the furnace roller spacing l of the cooling section in the continuous annealing furnace010m, and 2mm in thickness h of incoming strip steel;
subsequently, in step C), the modulus of elasticity, chi, of the material at high temperature is calculatedT：
In the formula, xT-the modulus of elasticity reduction factor of the steel at high temperature;
Tc-the temperature (deg.C) in the continuous annealing furnace;
subsequently, in a step D), the modulus of elasticity E of the strip at high temperature is calculatedT：
ET＝χTE
In the formula, ETTemperature TcInitial modulus of elasticity (N/mm) of steel material2)；
E-modulus of elasticity (N/mm) of Steel at Normal temperature2)；
Then in step E), calculating the flow rate of cooling gas on the upper surface and the lower surface of the strip steel:
in the formula ums-the flow rate of cooling gas on the upper surface of the strip steel in the cooling section of the furnace;
umx-the flow rate of cooling gas on the lower surface of the strip steel in the cooling section of the furnace;
us-the flow rate of cooling gas at the fan outlet on the upper surface of the strip steel in the cooling section of the furnace;
ux-the flow rate of cooling gas at the fan outlet on the lower surface of the strip steel in the cooling section of the furnace;
s is the length of a fan nozzle at a cooling section in the continuous annealing furnace;
a-fan characteristic parameters of a cooling section in a furnace;
b-the width of a fan nozzle of a cooling section in the continuous annealing furnace;
calculating the cooling gas flow velocity u on the upper surface of the strip steel of the cooling section in the furnacems57.6m/s, the flow velocity u of cooling gas on the lower surface of the strip steel in the cooling section in the furnacemx＝38.88m/s；
And then in step F), calculating the pressure difference between the upper surface and the lower surface of the strip steel under the action of a fan:
in the formula, pms-the pressure of the upper surface of the strip steel of the cooling section in the continuous annealing furnace;
pmx-pressure of the lower surface of the strip steel of the cooling section in the continuous annealing furnace;
delta p is the pressure difference between the upper surface and the lower surface of the strip steel under the action of the fan;
ums-cooling gas flow rate on the upper surface of the strip steel;
umx-the flow rate of cooling gas on the lower surface of the strip steel;
us-the flow rate of cooling gas at the outlet of the fan on the upper surface of the strip steel in the continuous annealing furnace;
ux-the flow rate of cooling gas at the outlet of the fan on the lower surface of the strip steel in the continuous annealing furnace;
ps-the pressure at the outlet of the fan at the cooling section in the continuous annealing furnace;
px-the pressure at the outlet of the fan at the cooling section in the continuous annealing furnace;
h, the height from a fan nozzle of a cooling section in the continuous annealing furnace to the surface of the strip steel;
calculating the pressure p on the upper surface of the strip steel in the cooling section of the continuous annealing furnacems1450Pa, pressure p of the lower surface of the strip steel in the cooling section of the continuous annealing furnacemx1410Pa, and the pressure difference Δ p between the upper surface and the lower surface of the strip steel under the action of a fan is 40 Pa;
then in step G), calculating the maximum deflection deformation of any unit of the strip steel in the continuous annealing furnace:
wherein, Deltax is the unit strip steel width;
l0-cooling section furnace roller spacing;
Δqei-strip steel ith cell pressure;
FRithe support reaction force of the furnace roller to the unit i;
FSi-shear of the ith cell;
Mi-torque of the ith unit;
wyi-the amount of deflection of the ith cell along the y-axis;
wmaxi-the maximum deflection of the ith unit;
subsequently, in step H), the maximum deflection of the strip is calculated:
wmax＝k·max{wmax1,...,wmaxi,...,wmax2n+1}
in the formula, wmax-maximum deflection of the strip steel;
k is a working condition correction coefficient, and k is 0.259;
and finally, in the step I), outputting the warping amount generated by the single-factor difference of the fan pressure of the upper surface and the lower surface of the strip steel, and completing the forecasting of the influence of the single-factor of the fan pressure of the surface of the strip steel of the aluminum-zinc plating unit on the C warping.
TABLE 2 comparison of predicted and actual values of warpage of strip steel in example 2
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (9)
1. A forecasting method for influence of single factor of fan pressure on the surface of strip steel of an aluminum-zinc plating unit on C warp is characterized by comprising the following steps:
A) collecting key equipment parameters in a continuous annealing furnace of the aluminum-zinc plating unit;
B) collecting material characteristic parameters of the strip steel;
C) calculating the modulus of elasticity reduction coefficient of the material at high temperature;
D) calculating the elastic modulus of the strip steel at high temperature;
E) calculating the flow velocity of cooling gas on the upper surface and the lower surface of the strip steel;
F) calculating the pressure difference between the upper surface and the lower surface of the strip steel under the action of the fan;
G) calculating the maximum deflection deformation of any unit of the strip steel in the continuous annealing furnace;
H) calculating the maximum deflection deformation of the strip steel;
I) and outputting the warping amount generated by the pressure difference of the fans on the upper surface and the lower surface of the strip steel.
2. The method for forecasting the influence of the single factor of the fan pressure on the surface of the strip steel of the aluminum-zinc plating unit on the C warp as claimed in claim 1,
A) collecting key equipment parameters in a continuous annealing furnace of the aluminum-zinc plating unit, including the flow velocity u of cooling gas at the outlet of a fan on the upper surface of the strip steel in the continuous annealing furnacesAnd the flow velocity u of cooling gas at the outlet of the fan on the lower surface of the strip steel in the continuous annealing furnacexOutlet pressure p of fan on upper surface of strip steel in cooling section of continuous annealing furnacesAnd the outlet pressure p of the fan on the lower surface of the strip steel of the cooling section in the continuous annealing furnacexContinuous annealing furnace temperature TcThe density rho of cooling gas of a cooling section in the continuous annealing furnace, the length s of a fan nozzle of the cooling section in the continuous annealing furnace, the characteristic parameter a of the fan of the cooling section in the annealing furnace (determined by the characteristics of a jet cooling device), the height H from the fan nozzle of the cooling section in the continuous annealing furnace to the surface of the strip steel and the width b of the fan nozzle of the cooling section in the continuous annealing furnace.
3. The method for forecasting the influence of the single factor of the fan pressure on the surface of the strip steel of the aluminum-zinc plating unit on the C warp as claimed in claim 2, wherein B) collects the material characteristic parameters of the strip steel, including the elastic modulus E of the strip steel at normal temperature and the furnace roller spacing l of the cooling section in the continuous annealing furnace0And the thickness h of incoming strip steel.
4. The method for forecasting the influence of the single factor of the fan pressure on the surface of the strip steel of the aluminum-zinc plating unit on the C warp as claimed in claim 3,
C) calculating the modulus of elasticity and the reduction coefficient chi of the material at high temperatureT：
In the formula, xT-the modulus of elasticity reduction factor of the steel at high temperature;
Tctemperature in the continuous annealing furnace (. degree. C.).
5. The method for forecasting the influence of the single factor of the fan pressure on the surface of the strip steel of the aluminum-zinc plating unit on the C warp as claimed in claim 4,
D) calculating the modulus of elasticity E of the strip steel at high temperatureT：
ET＝χTE；
In the formula (I), the compound is shown in the specification,
ETtemperature TcInitial modulus of elasticity (N/mm) of steel material2)；
E-modulus of elasticity (N/mm) of Steel at Normal temperature2)。
6. The method for forecasting the influence of the single factor of the fan pressure on the surface of the strip steel of the aluminum-zinc plating unit on the C warp as claimed in claim 5,
E) calculating the flow velocity of cooling gas on the upper surface and the lower surface of the strip steel:
in the formula ums-the flow rate of cooling gas on the upper surface of the strip steel in the cooling section of the furnace;
umx-the flow rate of cooling gas on the lower surface of the strip steel in the cooling section of the furnace;
us-the flow rate of cooling gas at the fan outlet on the upper surface of the strip steel in the cooling section of the furnace;
ux-the flow rate of cooling gas at the fan outlet on the lower surface of the strip steel in the cooling section of the furnace;
s is the length of a fan nozzle at a cooling section in the continuous annealing furnace;
a-fan characteristic parameters of a cooling section in a furnace;
b-the width of the fan nozzle of the cooling section in the continuous annealing furnace.
7. The method for forecasting the influence of the single factor of the fan pressure on the surface of the strip steel of the aluminum-zinc plating unit on the C warp as claimed in claim 6,
F) calculating the pressure difference between the upper surface and the lower surface of the strip steel under the action of the fan:
in the formula, pms-the pressure of the upper surface of the strip steel of the cooling section in the continuous annealing furnace;
pmx-pressure of the lower surface of the strip steel of the cooling section in the continuous annealing furnace;
delta p is the pressure difference between the upper surface and the lower surface of the strip steel under the action of the fan;
ums-cooling gas flow rate on the upper surface of the strip steel;
umx-the flow rate of cooling gas on the lower surface of the strip steel;
us-the flow rate of cooling gas at the outlet of the fan on the upper surface of the strip steel in the continuous annealing furnace;
ux-the flow rate of cooling gas at the outlet of the fan on the lower surface of the strip steel in the continuous annealing furnace;
ps-the pressure at the outlet of the fan at the cooling section in the continuous annealing furnace;
px-the pressure at the outlet of the fan at the cooling section in the continuous annealing furnace;
h is the height from the cooling section fan nozzle in the continuous annealing furnace to the surface of the strip steel.
8. The method for forecasting the influence of the single factor of the fan pressure on the surface of the strip steel of the aluminum-zinc plating unit on the C warp as claimed in claim 7,
G) calculating the maximum deflection deformation of any unit of the strip steel in the continuous annealing furnace:
wherein, Deltax is the unit strip steel width;
l0-cooling section furnace roller spacing;
Δqei-strip steel ith cell pressure;
FRithe furnace roller pair support of the ith unitCounterforce;
FSi-shear of the ith cell;
Mi-torque of the ith unit;
wyi-the amount of deflection of the ith cell along the y-axis;
wmaxi-the maximum deflection of the ith unit.
9. The method for forecasting the influence of the single factor of the fan pressure on the surface of the strip steel of the aluminum-zinc plating unit on the C warp as claimed in claim 8,
H) calculating the maximum deflection deformation of the strip steel:
wmax＝k·max{wmax1,...,wmaxi,...,wmax2n+1}
in the formula, wmax-maximum deflection of the strip steel;
k is the working condition correction coefficient, and k is 0.259.
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