CN109848247B - Cold-rolled strip steel coiling tension control method and control device thereof - Google Patents
Cold-rolled strip steel coiling tension control method and control device thereof Download PDFInfo
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Abstract
The invention relates to a method for controlling the coiling tension of a cold-rolled strip steel, which comprises the following steps: step 1: determining the tension multiple of the hard core according to the yield strength, the maximum static friction coefficient, the cross-sectional area, the capacity and the state of a coiling machine of the strip steel; step 2: determining a specified coil diameter of a set tension starting point according to the diameter of the winding drum and the outer diameter of the steel coil; and step 3: and controlling the coiling tension according to the hard core tension multiple and the specified coil diameter of the set tension starting point. According to the scheme, a better unit threading tension value method is quickly provided when the product variety and specification and the surface change are large or the coiling machine equipment is degraded, so that the problems of heart-shaped coiling, coil collapse or coil loosening are avoided.
Description
Technical Field
The invention relates to a control method, in particular to a cold-rolled strip steel coiling tension control method, which is particularly suitable for determining threading tension when variety and specification change is large or equipment state is degraded, and belongs to the technical field of ferrous metallurgy.
Background
Strip steel coiling is taken as the last procedure before the steel coil is off-line, if coiling tension is not controlled well, core-shaped coiling, coil collapse or coil loosening defects can be generated, the yield is influenced, particularly the core-shaped coiling defects, and even the whole coil is scrapped because the coiling requirements of the next procedure are not met in serious cases.
Conventionally, a ramp tension control method is generally used, in which the winding tension is greater than a set tension immediately after the start of winding, and the steel coil is wound up at the set winding tension when the steel coil reaches a predetermined coil diameter. The waveform of the coiling tension and the coiling diameter is shown in figure 1. Obtaining threading tension on the basis of the set tension by inputting the tension multiple of the hard core; and a roll diameter starting point for setting tension control is given by inputting a specified roll diameter value. The determination method of the hard core tension multiple is many, but most of the methods are based on experience or experimental data, and then the table is looked up to obtain the hard core tension multiple. Such as application No. 201610439217.1, a method and a device for controlling the coiling tension of the strip steel, and a method for controlling the threading tension of the coiler by preventing the coil collapse phenomenon from occurring in application No. 201210474676.5. When producing new specifications, varieties and surface products beyond experience or experimental data, and when the capacity and state of the coiler deteriorate, the prior art does not give a corresponding method for setting the threading tension, and therefore, a new solution to this technical problem is urgently needed.
Disclosure of Invention
The invention provides a method for controlling the coiling tension of a cold-rolled strip steel, aiming at the technical problems in the prior art, and the method can quickly provide a better unit threading tension value method when the product variety and specification and the surface change are large or coiling machine equipment is degraded, thereby avoiding the problems of heart-shaped coiling, coil collapse or coil loosening.
In order to achieve the above object, the technical solution of the present invention is as follows, a method for controlling the coiling tension of a cold-rolled strip steel, characterized in that the method specifically comprises:
step 1: determining the tension multiple of the hard core according to the yield strength, the maximum static friction coefficient, the cross-sectional area, the capacity and the state of a coiling machine of the strip steel;
step 2: determining a specified coil diameter of a set tension starting point according to the diameter of the winding drum and the outer diameter of the steel coil;
and step 3: and controlling the coiling tension according to the hard core tension multiple and the specified coil diameter of the set tension starting point.
As a modification of the invention, in the step 1, the strip steel has the yield strength of [360,430] MPa, the thickness of [0.17,0.6] mm, the width of [650,1080] mm and the outer diameter of [550,2000] mm;
in the above scheme, the hard core tension multiple K is T/T (1);
wherein the unit set tension t is determined during production debugging according to the variety and the specification; the unit threading tension T is calculated according to the formula (2):
T＝k0k1k2μ0σs (2)；
in equation (2), the device capability coefficient k0Value range [0.5,0.55 ]]Preferred values are 0.52 and 0.53; the device state coefficient k1Value range [0.94, 1%]Preferably, the value is: the state is 1 with excellent, generally 0.97, and the difference is 0.94; the cross section coefficient k2Value areaM [0.7,1.1 ]]Corresponding to the range of the thickness h (mm) of the strip steel b (mm) [110,650]When h (mm) b (mm) 110, k2Taking 1.1; when h (mm) b (mm) 650, k2Taking 0.7; when h (mm) b (mm) is other values, k is2Value range [0.7, 1.1%]Internally uniform interpolation to determine k2The value is obtained.
I.e. k is calculated according to the formula (3)2：
k2＝1.1-0.4*(h*b-110)/540 (3)；
μ0Is the maximum static friction coefficient, sigma, between steel coil layersSThe yield strength of the strip steel material.
As an improvement of the present invention, in the step 2, the specified roll diameter Dt of the set tension starting point is calculated according to the formula (4);
calculating the outer diameter of the steel coil according to a formula (5);
in the formula (5), W is the coil weight of the steel coil, rho is the material density of the steel coil, b is the width of the strip steel, and DreelIs the spool diameter.
In step 3, the winding tension is controlled according to the hard core tension multiple K and the specified roll diameter Dt of the set tension starting point, the threading tension T is Kt, wherein T is the set tension, and the threading tension is determined according to the variety and the specification during production debugging, and the winding diameter [ D ] is determinedreel,Dt]Within the range, the unit coiling tension is reduced at a constant speed from T to T; from coil diameter to DtAt the beginning, constant tension winding is performed at a unit setting tension t.
A control device of a cold-rolled strip steel coiling tension control method is characterized by comprising the following steps:
the first determining unit is used for determining the hard core tension multiple according to the yield strength, the maximum static friction coefficient, the cross sectional area, the capacity and the state of the coiling machine of the strip steel;
the second determining unit is used for determining the specified coil diameter of the set tension starting point according to the diameter of the winding drum and the outer diameter of the steel coil;
and the control unit is used for controlling the winding tension according to the hard core tension multiple and the specified winding diameter of the set tension starting point.
As an improvement of the present invention, the first determining Unit, the second determining Unit and the control Unit are implemented by a Central Processing Unit (CPU), a Digital Signal Processor (DSP), a Programmable logic Array (FPGA), and a Micro Control Unit (MCU) in the apparatus.
Compared with the prior art, the method has the advantages that the technical scheme associates 5 factors of the yield strength of the steel coil material, the maximum static friction coefficient between strip steel layers, the capacity of the winding drum equipment, the equipment state and the strip steel section area in a unit threading tension calculation formula, is more suitable for quickly giving a better winding tension control value when the product variety and specification are switched and the surface friction coefficient is changed or the winding drum equipment is degraded, and reduces the defects of heart-shaped coils, coil collapse or coil loosening.
Drawings
FIG. 1 is a waveform of the take-up tension versus the roll diameter of the present invention;
FIG. 2 is a schematic flow chart of a cold-rolled strip steel coiling tension control method provided by an embodiment of the invention;
fig. 3 is a schematic structural diagram of a cold-rolled strip steel coiling tension control device provided by an embodiment of the invention.
The specific implementation mode is as follows:
for the purpose of promoting an understanding of the invention, reference will now be made in detail to the present invention as illustrated in the accompanying drawings.
Example 1: referring to fig. 1 to 3, an implementation flow of a method for controlling the coiling tension of a cold-rolled strip coil is shown in fig. 2, and the method comprises the following steps:
step 1, according to the yield strength sigma of the strip steelSMaximum silenceCoefficient of friction mu0Determining a hard core tension multiple K according to the cross-sectional area (thickness h x width b), the capacity and the state of a coiling machine;
in the step, the influence of 5 factors of the yield strength of the strip steel, the maximum static friction coefficient, the cross section area, the equipment capacity and the equipment state on the tension multiple of the hard core is comprehensively considered. The method has the characteristic of quickly giving a better threading tension set value when the 5 factors are changed.
Calculating threading tension according to formula (1):
K＝T/t (1)；
wherein the unit set tension t is determined during production debugging according to the variety and the specification;
the set tensions for a certain variety are shown in table 1 below:
TABLE 1 set tension table
For example: certain kinds of planned strip steel 1 with thickness h of 0.2mm and width b of 1035mm and yield strength sigmaS400 MPa; strip steel 2, thickness h is 0.5mm, width 940mm, yield strength sigmaS＝380MPa。
The unit threading tension T is calculated according to the formula (2):
T＝k0k1k2μ0σs (2)；
in equation (2), the device capability coefficient k0Taking a preferred value of 0.52; the device state coefficient k1Taking the optimal value: the state is 1 with excellent, generally 0.97, and the difference is 0.94; calculating the coefficient k of the cross-sectional area according to the formula (3)2：
k2＝1.1-0.4*(h*b-110)/540 (3)；
Then, k of the strip 121.028, band steel 2K of (a)2＝0.833。
Maximum coefficient of static friction between layers mu0Measured by experiments on steel plates of typical surfaces. Such as: taking a small piece of typical surface strip steel, weighing by a spring balance to obtain the weight mg of 8.0N, slowly applying force to pull the strip steel to start horizontal sliding on another section of strip steel, and recording the maximum traction force f when the strip steel just starts to slide01.8N, according to the formula f0＝μ0mg, has a0＝0.225。
The table look-up 1 includes: the unit set tension t of the strip steel 1 is 33.8 MPa; the unit set tension t of the strip 2 was 26.5 MPa. The calculation results of the relevant threading tension T and the hard core tension multiple K are shown in table 2 below:
table 2 hard core tension multiple calculation table
Step 2, according to the diameter D of the winding drumreelDetermining the specified coil diameter D of the set tension starting point according to the outer diameter D of the steel coilt。
In this step, a predetermined roll diameter D for setting a tension start point is calculated according to the formula (4)t。
In this step, in order to facilitate production control, the value of the outer diameter D of the steel coil is usually taken as an average value of the outer diameters of the steel coils to be produced (or produced) within a period of time.
Further, the outer diameter of each coil of steel may be calculated according to equation (5)
In the formula (5), W is the coil weight of the steel coil, rho is the material density of the steel coil, b is the width of the strip steel, and DreelIs the spool diameter.
Such as: taking the average value of the outer diameters of the steel coils produced by the unit in the previous month as the outer diameter value of the steel coils: if D is 1.186m, Dt is 0.675m according to equation (4).
And 3, controlling the coiling tension according to the hard core tension multiple and the diameter of the steel coil with the set tension starting point. As the hard core tension multiple K and the threading tension T are determined in the step 1, the diameter Dt of the steel coil with the set tension starting point is determined in the step 2, and the diameter D is determined in the coil diameter [ D ] as shown in the attached figure 1reel,Dt]Within the range, the coiling unit tension is reduced at a constant speed from T to T; from coil diameter to DtAt the beginning of the time, constant tension winding is performed with the unit set tension t.
The method for controlling the coiling tension of the cold-rolled strip steel has the characteristics that the threading tension set value takes the multiple factors of the yield strength, the surface friction coefficient, the equipment capacity, the equipment state and the strip steel sectional area into consideration, so that the threading tension set value is more refined, the change of the factors is more adaptive, the coiling tension control is more optimized, and the defects of heart-shaped coil, coil collapse and coil loosening are reduced.
Example 2:
compared with embodiment 1, the present embodiment also provides a cold-rolled strip steel coiling tension control device. As shown in fig. 3. The device comprises: a first determining unit 21, a second determining unit 22, a control unit 23. Wherein the content of the first and second substances,
the first determination unit is used for determining the yield strength sigma of the strip steelSMaximum coefficient of static friction mu0The unit threading tension and the hard core tension multiple K are determined according to the cross section area (namely the thickness h x the width b) of the strip steel, the capacity and the state of a coiling machine. The determining unit comprehensively considers the influence of the factors of equipment capacity, equipment state, strip steel sectional area, friction coefficient and strip steel yield strength on the set value of threading tension. The setting of threading tension is more refined, the change of the factors is more adaptive, the coiling tension is controlled more optimally, and the defects of heart-shaped coil, coil collapse and coil loosening are reduced.
A first determination unit for calculating the hard core tension multiple according to the formula (1)
K＝T/t (1)；
The set tension t value in the formula (1) is determined during production debugging according to the variety and the specification, and a set tension table is established. The first determination unit stores the set tension table.
A first determination unit for calculating a threading tension T according to formula (2):
T＝k0k1k2μ0σs (2)；
maximum coefficient of static friction mu between steel layers in the formula (2)0Inputting the measured steel plate with a typical surface into a first determining unit; the strip steel yield strength sigmas is obtained through product design or inspection. K is0(tension coefficient) value range [0.5, 0.55%]Preferred values of 0.52 and 0.53, selected primarily based on equipment capabilities; k is1(device State coefficient) value range [0.94,1]Preferably, the value is: the state is 1 with excellent, generally 0.97, and the difference is 0.94; k is2(section coefficient of strip steel) value range [0.7,1.1]Corresponding to the range of the thickness h (mm) of the strip steel b (mm) [110,650]When h (mm) b (mm) 110, k2Taking 1.1; when h (mm) b (mm) 650, k2Taking 0.7; when h (mm) b (mm) is other values, k is2Value range [0.7, 1.1%]Internally uniform interpolation to determine k2The value is obtained. A first determination unit for calculating k according to formula (3)2：
k2＝1.1-0.4*(h*b-110)/540 (3)；
Such as: for the steel strips 1 and 2 of example 1, the maximum coefficient of static friction μ was measured according to the experiment00.225, obtaining the yield strength sigmas of the strip steel according to the production information, and selecting k according to the equipment capacity, the equipment state and the section area of the strip steel0(preferred value is 0.52), k1And k2Then, the threading tension T is respectively 46.67 MPa and 35.9MPa when the equipment state is normal; when the equipment state is poor, the threading tension T is 45.22 and 34.8MPa respectively. Correspondingly, when the equipment state is common, the tension multiples of the strip steel 1 and the strip steel 2 are 1.38 and 1.36; when the equipment state is degraded, the tension multiples of the strip steel 1 and the strip steel 2 are 1.34 and 1.31.
When the first determining unit 21 determines the threading tension or tensionAfter the multiple, the second determining unit is used for determining the specified coil diameter D of the set tension starting point according to the diameter of the winding drum and the diameter of the steel coilt。
The second determining unit 22 calculates a predetermined roll diameter D of the set tension start point according to the formula (4)t。
Here, the second determination unit calculates the coil diameter according to equation (5)
In the formula (5), W is the coil weight of the steel coil, ρ is the material density of the steel coil, b is the width of the strip steel, and the diameter of the winding drum Dreel.
For the convenience of production control, the value of the outer diameter D of the steel coil is usually the average value of the outer diameters of the steel coils to be produced (or produced) in a period of time.
Such as: taking the average value of the outer diameters of the steel coils produced by the unit in the previous month as the outer diameter value of the steel coils: if D is 1.186m, Dt is 0.675m according to equation (4).
And the control unit 23 is used for controlling the coiling tension according to the hard core tension multiple K and the diameter Dt of the steel coil with the set tension starting point.
Since the first determining unit 21 calculates the hard core tension multiple K and the threading tension T (T ═ Kt) values, the second determining unit 22 calculates the set tension starting point coil diameter Dt as long as the coil diameter [ D ] is the diameter as shown in fig. 1reel,Dt]Within the range, the coiling unit tension is reduced at a constant speed from T to T; from coil diameter to DtAt the beginning of the time, constant tension winding is performed with the unit set tension t.
In practical applications, the first determining Unit 21, the second determining Unit 22 and the control Unit 23 may be implemented by a Central Processing Unit (CPU), a Digital Signal Processor (DSP), a Programmable logic Array (FPGA), and a Micro Control Unit (MCU) in the apparatus.
In the cold-rolled strip steel coiling tension control device provided by the embodiment, the first determining unit 21 comprehensively considers the influence of 5 factors of strip steel yield strength, surface friction coefficient, equipment capacity, equipment state and strip steel sectional area, and has the characteristics of more refined strip threading tension setting and convenience for rapidly providing a better strip threading tension set value when the influence factors change. Finally, the coiling tension control is optimized, and the defects of heart-shaped coil, coil collapse and coil loosening are reduced.
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 (5)
1. The method for controlling the coiling tension of the cold-rolled strip steel is characterized by comprising the following steps of:
step 1: determining the tension multiple of the hard core according to the yield strength, the maximum static friction coefficient, the cross-sectional area, the capacity and the state of a coiling machine of the strip steel;
step 2: determining a specified coil diameter of a set tension starting point according to the diameter of the winding drum and the outer diameter of the steel coil;
and step 3: controlling the coiling tension according to the hard core tension multiple and the specified coil diameter of the set tension starting point;
in the step 1, the yield strength of the strip steel is 360,430 MPa, the thickness is 0.17 and 0.6 mm, the width is 650,1080 mm, and the outer diameter is 550,2000 mm;
in the above scheme, the hard core tension multiple K is T/T (1);
wherein the unit set tension t is determined during production debugging according to the variety and the specification; the unit threading tension T is calculated according to the formula (2):
T＝k0k1k2μ0σs (2)；
in equation (2), the device capability coefficient k0Value range [0.5,0.55 ]]Said device state coefficientk1Value range [0.94, 1%]Said cross-sectional coefficient k2Value range [0.7, 1.1%]Corresponding to the range of the thickness h (mm) of the strip steel b (mm) [110,650]；
I.e. k is calculated according to the formula (3)2：
k2＝1.1-0.4*(h*b-110)/540 (3)；
μ0Is the maximum static friction coefficient, sigma, between steel coil layersSThe yield strength of the strip steel material.
2. The method for controlling the coiling tension of the cold-rolled strip steel as claimed in claim 1, wherein in the step 2, the specified coil diameter Dt of the set tension starting point is calculated according to the formula (4);
calculating the outer diameter of the steel coil according to a formula (5);
in the formula (5), W is the coil weight of the steel coil, rho is the material density of the steel coil, b is the width of the strip steel, and DreelIs the spool diameter.
3. The method of claim 2, wherein in step 3, the winding tension is controlled according to the hard core tension multiple K and a predetermined coil diameter Dt of a set tension start point, and the threading tension T is Kt, where T is the set tension, and is determined according to the type and specification during production debugging, and is determined at the coil diameter [ D [ D ] ]reel,Dt]Within the range, the unit coiling tension is reduced at a constant speed from T to T; from coil diameter to DtAt the beginning, constant tension winding is performed at a unit setting tension t.
4. A control apparatus for realizing the method of controlling the coiling tension of the cold-rolled strip steel according to any one of claims 1 to 3, characterized in that the apparatus comprises:
the first determining unit is used for determining the hard core tension multiple according to the yield strength, the maximum static friction coefficient, the cross sectional area, the capacity and the state of the coiling machine of the strip steel;
the second determining unit is used for determining the specified coil diameter of the set tension starting point according to the diameter of the winding drum and the outer diameter of the steel coil;
and the control unit is used for controlling the winding tension according to the hard core tension multiple and the specified winding diameter of the set tension starting point.
5. The apparatus for controlling the coiling tension of cold-rolled strip steel according to claim 4, wherein the first determining Unit, the second determining Unit and the control Unit are implemented by a Central Processing Unit (CPU), a Digital Signal Processor (DSP), a Programmable logic Array (FPGA), and a Micro Control Unit (MCU) in the apparatus.
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| CN111014341A (en) * | 2019-12-18 | 2020-04-17 | 东北轻合金有限责任公司 | Method for realizing variable-tension rolling of hot rolling coiler |
| CN112224967B (en) * | 2020-10-13 | 2022-12-13 | 首钢京唐钢铁联合有限责任公司 | Method and device for controlling tension of coiling machine and electronic equipment |
| CN112893482B (en) * | 2021-01-18 | 2023-04-14 | 湖南华菱涟源钢铁有限公司 | High-strength steel coiling tension control method, device, equipment and storage medium |
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