CN105363800A - Precise plate shape value obtaining method based on sectional shape - Google Patents

Abstract

A precise plate shape value obtaining method based on a sectional shape includes the following steps that firstly, a sectional shape measuring instrument and a plate shape measuring roll are sequentially arranged on an outlet of a rolling mill in the strip steel moving direction, the plate shape measuring roll is provided with a certain number of pressure sensors, namely measuring channels, each measuring channel measures the radial force of the corresponding strip steel, and the width of each measuring channel is w; and the sectional shape measuring instrument measures the actual strip steel thickness values corresponding to all the measuring channels on the plate shape measuring roll; secondly, the strip steel is tracked, the sectional shape values of all the strip steel in the length direction are obtained through the sectional shape measuring instrument, the radial force values are taken when the strip steel moves to the plate shape measuring roll, and the strip steel elongation distribution in the width direction is worked out according to the strip steel sectional shape values and the radial force values; and thirdly, the precise actual plate shape value is worked out through the strip steel elongation distribution. By means of the precise plate shape value obtaining method, the actual problem that the edge plate shape is prone to distortion is solved, and thus it is guaranteed that a plate shape control device acts correctly, and the obtained plate shape value is more precise.

Description

A kind of accurate plate shape value-acquiring method based on section configuration

Technical field

The present invention relates to strip cold rolling mills technology, particularly a kind of accurate plate shape value-acquiring method based on section configuration.

Background technology

Plate shape is the important quality index of cold-strip steel, and the plate shape of cold-strip steel directly has influence on the productivity ratio of the downstream industries such as automobile, household electrical appliances, instrument, packaging for foodstuff, lumber recovery and the height of cost and the outward appearance of product.

Plate Profile Measuring System divides according to the relation of band steel and Plate Profile Measuring System, is divided into contact and contactless.The signal detection of contact Plate Profile Measuring System is direct, and signal transacting ratio is easier to fidelity, and thus certainty of measurement is high, is current main flow Plate Profile Measuring System.At present, domestic Plate Profile Measuring System is mainly contact measuring apparatus, and its detecting element is all pressure sensor.The principle that plate shape value obtains is that on the strip width direction that provides according to Plate Profile Measuring System, tension distribution obtains plate shape value indirectly according to certain algorithm, and this computational process completes in plate shape measurement computer.

Traditional plate shape value-acquiring method is when supposing that belt steel thickness is in the direction of the width constant, does not namely consider the section configuration being with steel, therefore easily causes final plate shape value generation error.In actual production, the Edge shape of band steel often produces relatively large deviation, and its main cause is exactly steel edge portion thinner thickness.

Existing milling train plat control system, as shown in Figure 1, actual plate shape value with steel obtains according to the radial load signal indirect calculation of pressure sensor on plate shape measurement roller 20, the action of actual plate shape value adjustment Ban Xing executing agency 40 (work roll bending/intermediate calender rolls roller/inclination) that Strip Shape Control device 40 provides according to plate shape measurement computer 30.Wherein, the accurate acquisition of plate shape actual value serves important function for band steel steady production.

Existing plate shape actual value acquisition methods is as follows:

1) arrange plate shape measurement roller 20 in milling train 10 exit, obtained the radial load signal of band steel along multiple pressure sensors (Measurement channel) that roll surface is arranged by plate shape measurement roller 20, the strip tension calculated on each Measurement channel is:

$F_{T,1}=\frac{F_{R,i}}{2\×\sin \frac{\mathrm{\α}}{2}}$

In above formula, F _{r, i}represent the band steel radial load (unit: N) measured, α represents the cornerite (unit: degree) that band steel is formed on plate shape measurement roller;

Describe the radial load of plate shape measurement roller 20 and the relation of strip tension in fig. 2.

2) calculating of tension force mean value

$F_{\mathrm{av}}=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{F}_{T,i}}{n}$

In above formula, the number of n display plate shape Measurement channel.

3) the band steel tensile stress (unit: N/mm on whole strip width is calculated ²)

${\mathrm{\σ}}_0=\frac{F_S}{w\×n\×h}$

In above formula, the width (unit: mm) of w display plate shape Measurement channel, F _srepresent the strip tension setting value (unit: N) on whole strip width, h represents the thickness setting value (unit: mm) of band steel.

4) the band steel tensile stress (unit: N/mm on each Measurement channel is calculated ²)

${\mathrm{\σ}}_i=\frac{F_{T,i}\×{\mathrm{\σ}}_0}{F_{\mathrm{av}}}$

5) according to Hooke's law, the band steel percentage elongation (unit: I) on each Measurement channel is calculated

${\mathrm{\ϵ}}_i=\frac{{\mathrm{\σ}}_i-{\mathrm{\σ}}_0}{E}\×{10}^5$

In above formula, E represents the elastic modelling quantity of band steel.

Existing plate shape actual value acquisition methods does not consider the section configuration being with steel, but hypothesis band steel thickness equal and opposite in direction in the direction of the width, the belt steel thickness setting value therefore only needing external equipment to provide milling train to export and tension force setting value.

Existing plate shape actual value acquisition methods is in computational process, do not consider the band steel actual (real) thickness on each Measurement channel, therefore, there is certain deviation in the result of calculation of band steel tensile stress, thus cause final plate shape value to be namely with the distribution of steel percentage elongation to occur deviation.

Summary of the invention

The object of the invention is to propose a kind of accurate plate shape value-acquiring method based on section configuration, solve the practical challenges of the easy distortion of Edge shape well, thus ensure Strip Shape Control device correct operation, the plate shape value of acquisition is more accurate.

For achieving the above object, technical scheme of the present invention is:

Based on an accurate plate shape value-acquiring method for section configuration, it comprises the steps:

1) section configuration measuring instrument, plate shape measurement roller is set gradually in milling train outlet along band steel moving direction, plate shape measurement roller is arranged pressure sensor and the Measurement channel of some, each Measurement channel measures radial load corresponding to band steel, and the width of Measurement channel is w; Belt steel thickness actual value corresponding to each Measurement channel of plate shape measurement roller measured by section configuration measuring instrument;

2) band steel is followed the tracks of, obtain the section configuration value of every section strip steel on length direction and belt steel thickness actual value h corresponding to each Measurement channel of plate shape measurement roller by section configuration measuring instrument _i; Move forward with belt steel rolling speed, when this section strip steel moves to plate shape measurement roller, take out the section configuration value corresponding to this section strip steel and belt steel thickness actual value h _idistribution and radial force value, calculate according to the section configuration value of band steel and the radial force value of band steel:

(1) strip tension on each Measurement channel is calculated:

$F_{T,1}=\frac{F_{R,i}}{2\×\sin \frac{\mathrm{\α}}{2}}---\left(1\right)$

In above formula, F _{r, i}represent that band steel measures radial load, unit: N; α represents that band steel exists

The cornerite that plate shape measurement roller is formed, unit: degree;

(2) the band steel tensile stress on each Measurement channel is calculated, unit: N/mm ²:

${\mathrm{\σ}}_i=\frac{F_{T,i}}{w\×h_i}---\left(2\right)$

In above formula, the width of w display plate shape Measurement channel, unit: mm; h _irepresent the belt steel thickness actual value that each Measurement channel is corresponding, unit: mm;

(3) the average band steel tensile stress on whole strip width is calculated, unit: N/mm ²;

${\mathrm{\σ}}_0=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\σ}}_i}{n}---\left(3\right)$

In above formula, the number of n display plate shape Measurement channel;

(4) the band steel percentage elongation on each Measurement channel is calculated, unit: I;

${\mathrm{\ϵ}}_i=\frac{{\mathrm{\σ}}_i-{\mathrm{\σ}}_0}{E}\×{10}^5---\left(4\right)$

In above formula, E represents the elastic modelling quantity of band steel;

3) by the calculating of the band steel percentage elongation distribution on above-mentioned strip width direction, thus accurate plate shape actual value is obtained.

The section configuration that the inventive method utilizes section configuration measuring instrument to provide calculates accurate actual value plate shape value.The method can ensure to obtain accurate plate shape actual value, and the Edge shape solved with steel in actual production often produces the problem of relatively large deviation.With existing methodical difference, method of the present invention is mainly that the present invention utilizes the section configuration measured value of bottom profiler, and do not consider the section configuration being with steel in existing method.

Often produce the problem of relatively large deviation for milling train Edge shape, the present invention proposes the accurate plate shape value-acquiring method based on section configuration, as shown in Figure 3.First provide the collocation method of section configuration measuring instrument, between milling train outlet and plate shape measurement roller, configure section configuration measuring instrument, then provide accurate plate shape value-acquiring method.Specific practice is followed the tracks of band steel, the section configuration value of the every section strip steel obtained at section configuration measuring instrument is stored in the move table, and move forward along with belt steel rolling speed, when this section strip steel moves to plate shape measurement roller, take out the section configuration value corresponding to this section strip steel and radial force value, obtain accurate plate shape actual value according to corresponding computational methods.

(1) the section configuration measuring instrument collocation method described in, refers to: between milling train outlet and plate shape measurement roller, install section configuration measuring instrument, for the section configuration value of on-line measurement band steel.

(2) method that band steel is followed the tracks of described in, refer to: by the distance determination tables of data of section configuration measuring instrument to plate shape measurement roller, for the storage of section configuration value, movement and reading, the length of band steel advance is obtained by the pulse counter signal being contained in operation roll of mill transmission side, when the length being with steel to advance is greater than section configuration measuring instrument to the distance of plate shape measurement roller, read the section configuration value in tables of data, extract the radial load of plate shape measurement roller simultaneously, thus obtain accurate plate shape actual value.

Beneficial effect of the present invention:

In existing plate shape actual value acquisition process, need the tensile stress size calculating band steel.Comprise the one-tenth-value thickness 1/10 of band steel in tensile stress computing formula, existing method have ignored the fluctuation of band steel actual (real) thickness value, supposes that belt steel thickness distribution is stable and is setting value.The present invention uses existing section configuration measuring instrument on milling train, and its measured value is supplied to plate shape measurement computer, utilizes new computational methods to obtain plate shape actual value.

The plate shape value-acquiring method that the present invention proposes, for the accuracy guaranteeing completed belt steel plate shape, has positive effect to the stability and reliability improving band steel lumber recovery and the guarantee operation of rolling.

Accompanying drawing explanation

Fig. 1 is the plat control system schematic diagram of existing milling train.

Fig. 2 is the radial load of plate shape roller measuring roller and the relation schematic diagram of strip tension.

Fig. 3 is the accurate plate shape value-acquiring method schematic diagram that the present invention is based on section configuration.

Fig. 4 is the storage of crown of strip information, movement and reading schematic diagram.

Detailed description of the invention

Below so drawings and Examples the present invention will be further described.

See Fig. 1 ~ Fig. 4, the accurate plate shape value-acquiring method based on section configuration of the present invention, it comprises the steps:

1) export along being with steel moving direction to set gradually section configuration measuring instrument 50, plate shape measurement roller 20 at milling train 10, plate shape measurement roller 20 is arranged pressure sensor and the Measurement channel of some, each Measurement channel measures radial load corresponding to band steel, and the width of Measurement channel is w; Belt steel thickness actual value corresponding to each Measurement channel of plate shape measurement roller 20 measured by section configuration measuring instrument 50;

2) band steel is followed the tracks of, obtain the section configuration value of every section strip steel on length direction and belt steel thickness actual value h corresponding to each Measurement channel of plate shape measurement roller 20 by section configuration measuring instrument 50 _i; Move forward with belt steel rolling speed, when this section strip steel moves to plate shape measurement roller, take out the section configuration value corresponding to this section strip steel and radial force value, calculate according to the section configuration value of band steel and the radial force value of band steel:

(1) strip tension on each Measurement channel is calculated:

$F_{T,1}=\frac{F_{R,i}}{2\×\sin \frac{\mathrm{\α}}{2}}---\left(1\right)$

In above formula, F _{r, i}represent that band steel measures radial load, unit: N; α represents the cornerite that band steel is formed on plate shape measurement roller, unit: degree;

(2) the band steel tensile stress on each Measurement channel is calculated, unit: N/mm ²:

${\mathrm{\σ}}_i=\frac{F_{T,i}}{w\×h_i}---\left(2\right)$

In above formula, the width of w display plate shape Measurement channel, unit: mm; h _irepresent the belt steel thickness actual value that each Measurement channel is corresponding, unit: mm;

(3) the average band steel tensile stress on whole strip width is calculated, unit: N/mm ²;

${\mathrm{\σ}}_0=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\σ}}_i}{n}---\left(3\right)$

In above formula, the number of n display plate shape Measurement channel;

(4) the band steel percentage elongation on each Measurement channel is calculated, unit: I;

${\mathrm{\ϵ}}_i=\frac{{\mathrm{\σ}}_i-{\mathrm{\σ}}_0}{E}\×{10}^5---\left(4\right)$

In above formula, E represents the elastic modelling quantity of band steel;

3) by the average band steel tensile stress on above-mentioned strip width and band steel percentage elongation, thus accurate plate shape actual value is obtained.

In FIG, the width specifications of the band steel on milling train 10: 1040mm, the width w of each Measurement channel of plate shape measurement roller 20 is 52mm, and therefore, the number n of band steel overlay shape Measurement channel is 20.Section configuration measuring instrument 50 is 1.2m with the horizontal range of plate shape measurement roller 20.The cornerite formed on plate shape measurement roller 20 with steel is 20 degree.In order to accurately obtain corresponding section configuration value from the tables of data in Fig. 4, need to carry out real-time tracking to band steel, can be come by the pulse counter signal be contained on operation roll of mill, when pulse counter increases some, then represented that band steel has advanced one section of fixing distance.

Composition graphs 3 is described as follows accurate plate shape value acquisition process:

(1) preservation of information table, movement and extraction

Known section configuration measuring instrument 50 is 1200mm with the horizontal range of plate shape measurement roller 20, the band steel Discrete control length L corresponding to each pulse counting signal ₀be 20 millimeters, therefore can be respectively the section configuration information table of 60 to complete the transmission of information, see Fig. 4 by capacity.Wherein, moving 1 information table is that the value of information of active cell is moved to next unit; The preservation of section configuration information table is completed by section configuration measuring instrument program, and the preservation of the movement of section configuration information table, extraction and performance information table, movement, extraction complete by plate shape measurement computer 30.

(2) computational process of actual plate shape value is obtained

1. from radial load distribution (unit: N) FR={580,438,359,326,336,344,372,400,424,436,438,430,410,386,362,348,354,390,474,620} that plate shape measurement roller obtains;

2. strip tension distribution (unit: the N) FT={50.36 on each Measurement channel is calculated according to formula (1), 38.03,31.17,28.3,29.17,29.88,32.3,34.73,36.81,37.86,38.03,37.33,35.6,33.51,31.43,30.21,30.74,33.86,41.15,53.83};

3. section configuration value (unit: the mm) h={0.281 of the 60th unit in section configuration information table is read, 0.286,0.292,0.295,0.298,0.302,0.303,0.306,0.308,0.309,0.309,0.308,0.306,0.304,0.302,0.299,0.297,0.294,0.288,0.284};

4. the band steel tensile stress distribution (unit: N/mm on each Measurement channel is calculated according to formula (2) ²) σ={ 3.45,2.56,2.05,1.84,1.88,1.9,2.05,2.18,2.3,2.36,2.37,2.33,2.24,2.12,2.0,1.94,1.99,2.21,2.75,3.65};

5. the average band steel tensile stress (unit: N/mm on whole strip width is calculated according to formula (3) ²) σ ₀=2.3085;

6. the band steel elastic modelling quantity E=205000N/mm in formula (4) ², band steel percentage elongation distribution (unit: I) ε={ 0.56,0.12 ,-0.13 on each Measurement channel is calculated according to formula (4),-0.23 ,-0.21 ,-0.2 ,-0.13,-0.06,0.0,0.03,0.03,0.01 ,-0.03 ,-0.09,-0.15 ,-0.18 ,-0.16,-0.05,0.22,0.65}.

The accurate plate shape value-acquiring method of the section configuration measuring instrument that the present invention utilizes milling train to export, the method can be implemented easily on the rolling line having section configuration measuring instrument, implementation method is the communication interface increasing section configuration measuring instrument and plate shape measurement computer, modifies to the existing program of plate shape measurement computer simultaneously.By the enforcement of the inventive method, for guaranteeing finished strip plate shape measurement precision, the belt plate shape fluctuation of minimizing finished product and guarantee rolling being stablized there is positive effect.

Claims (1)

1., based on an accurate plate shape value-acquiring method for section configuration, it is characterized in that, comprise the steps:

1) section configuration measuring instrument, plate shape measurement roller is set gradually in milling train outlet along band steel moving direction, plate shape measurement roller is arranged pressure sensor and the Measurement channel of some, each Measurement channel measures radial load corresponding to band steel, and the width of Measurement channel is w; Belt steel thickness actual value corresponding to each Measurement channel of plate shape measurement roller measured by section configuration measuring instrument;

2) band steel is followed the tracks of, obtain the section configuration value of every section strip steel on length direction and belt steel thickness actual value h corresponding to each Measurement channel of plate shape measurement roller by section configuration measuring instrument _i; Move forward with belt steel rolling speed, when this section strip steel moves to plate shape measurement roller, take out the section configuration value corresponding to this section strip steel and belt steel thickness actual value h _idistribution and radial force value, calculate according to the section configuration value of band steel and the radial force value of band steel:

(1) strip tension on each Measurement channel is calculated:

$F_{T,1}=\frac{F_{R,i}}{2\×\sin \frac{\mathrm{\α}}{2}}---\left(1\right)$

In above formula, F _{r, i}represent that band steel measures radial load, unit: N; α represents the cornerite that band steel is formed on plate shape measurement roller, unit: degree;

(2) the band steel tensile stress on each Measurement channel is calculated, unit: N/mm ²:

${\mathrm{\σ}}_i=\frac{F_{T,i}}{w\×h_i}---\left(2\right)$

In above formula, the width of w display plate shape Measurement channel, unit: mm; h _irepresent the belt steel thickness actual value that each Measurement channel is corresponding, unit: mm;

(3) the average band steel tensile stress on whole strip width is calculated, unit: N/mm ²;

${\mathrm{\σ}}_0=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\σ}}_i}{n}---\left(3\right)$

In above formula, the number of n display plate shape Measurement channel;

(4) the band steel percentage elongation on each Measurement channel is calculated, unit: I;

${\mathrm{\ϵ}}_i=\frac{{\mathrm{\σ}}_i-{\mathrm{\σ}}_0}{E}\×{10}^5---\left(4\right)$

In above formula, E represents the elastic modelling quantity of band steel;

3) by the calculating of the band steel percentage elongation distribution on above-mentioned strip width direction, thus accurate plate shape actual value is obtained.