Method for laser control of rolled strip shape

FIELD: laser control technologies.

SUBSTANCE: method includes sweep of light beam to straight line with providing for projection of this beam on surface of rolled strip, video capture of projection area of current beam on portion of controlled surface and point of nearby edge of rolled strip, projection area is separated on given number of ranges and for each range received image is separated on components, forming respectively line of edge points of beam light projection, being portion of measurement area, line of brightest points inside light beam projection range and line of edge points of beam projection, quitting measurement area, to determine their coordinates along rolling strip surface, coordinates of lines of brightest points and edge points within light beam projection are straightened, and value of total coordinate is determined, from which with consideration of coordinates of points of lines of brightest points within light beam projection, by geometric interpretation, total parameter of rolled strip shape SARK(i,j) is determined.

EFFECT: higher trustworthiness and efficiency.

8 dwg

 

The invention relates to measurement techniques and relates to a method of controlling the shape of rolled strip.

The main controlled parameters during rolling of metal strips are thick, its transverse and longitudinal thickness, characterized by a profile strips, as well as the shape and flatness (planetnet) bands. Due to the fact that the rolling mill, there is no single certainty in the application of the terms of profile, shape and flatness, and in various literature and patent publications can be found different interpretation of their use, are given below (in order unambiguous semantic understanding) a brief definition of the terms used.

The band profile is a measure lateral changes in thickness. The basic technological parameters that influence the profile, this thermal and mechanical barrel, and an elastic flattening of the work rolls.

Shape characterizes the lateral adjustment by lengthening the width of the rolled strip. Lateral adjustment of the elongation occurs when the percentage reduction in width is changed and the appropriate timing in width are not equal. The main reason for this are inappropriate incoming profile strip, together with the same parameters, which affect the profile. The shape of the strip is assessed is carried out by rolling in the rolling mill. Rolling is carried out with the tension created by additional external load.

To adjust the shape of the rolled strip can be heat (differentiated supply of lubricating coolant along the length of the work rolls), power (optional bending or bending of the work rolls) or joint profiling rolls. The flatness of the strip is its ability to lay on a perfect smooth surface without the use of additional external load. To assess the flatness may use a threshold value of the external load. It is estimated to stand after rolling.

The flatness associated with the form so that any transverse pressure changes can lead to the formation of defects (waves) on the strip, if you remove the tension applied by rolling, for example on the measuring stand after rolling or lifting, lowering tension on the mill. When changing the profile shape changes and, accordingly, the flatness. And back, the shape change may lead to changes in the profile.

Thus, in the rolling process is controlled by the shape of the rolled strips, the measurements which are used for correction of process and evaluated the flatness of the finished strips. However, the shape of the strips has a production value as an important parameter, influencing not the only end product, but first and foremost on the performance of the equipment. Incorrect form reduces the rolling speed, and when the critical value is the destabilization process, until it stops, breaks, etc.

There is a method of optical inspection of the shape of the rolled strip, which consists in scanning the surface of the rolled strip in its transverse direction of the light beam, defining a set of parameters of the individual points of this beam at the surface and comparing these parameters with reference (RU # 2179328, G 02 B 21/00, publ. 10.02.2002).

The known method is that the pre-scan light beam of the reference surface, and then along the same trajectories scan the analyzed surface, while sequentially scan each point as analyzed and the reference surface, at least first and second light beam, and these light beams are divided into two paraxial beams, one of which moves relative to the other in frequency and in space along the first axis in the first light beam and along the orthogonal axes of the second axis in the second light beam, commonly used to measure the phase difference of the reflected beams for the selected number of points scanned surface,approximate data on the phase difference of the reflected beams received p and the scanning reference surface, two-dimensional polynomials, then perform a two-dimensional integration of the said approximated data along the trajectory of light beams and approximate these integrated data of two-dimensional polynomials, then adjust the data on the phase difference of the reflected light rays generated by scanning the sample surface on the basis of the said approximated data of the phase difference between the reflected beams at the corresponding point of the reference surface, carry out two-dimensional integration mentioned adjusted data, obtained by scanning the sample surface, along the trajectory of light beams, adjust these integrated data based on the mentioned approximated and the integrated data of the phase difference between the reflected beams at the corresponding point of the reference surface, then build the image and/or determine the parameters of the profile of the surface.

The disadvantages of this method are its hardware complexity and the complexity in algorithmic solution, not allowing you to get the outcome indicators in the Express mode, which could be used as adjustment variables and parameters of the process control strip rolling mills, control is performed in the current the straps.

The present invention is directed to expanding Arsenal of hardware, allowing a new algorithm to control the shape of the rolled strip with simultaneous generation of signals for controlling the rolling process of this band.

Achievable technical result is to increase the reliability and time efficiency of the method of controlling the shape of rolled strip, which allows to use the results as control signals by the rolling process of this band.

This technical result is achieved in that in the method of laser control of the shape of the rolled strip, which consists in scanning the surface of the rolled strip in its transverse direction by a laser beam, determining the set of parameters of the individual points of this beam at the surface and comparing these parameters with the reference value, wherein when the scan enable projection of the laser beam on the surface of the rolled strip, carry out the capture of the projection of the beam on the surface of the rolled strip and points nearby the edges of the rolled strip, the resulting video image projection of the laser beam is divided into a specified number of intervals along the width of rental and for each interval the received video decompose n the line the most extreme points of the projection beam, included in the projection line of the most striking points within the projection beam line the most extreme points of the projection of rays emanating from the zone of measurement, and make removal of the coordinates of the lines, and then by the saved coordinates calculate the generalized parameter SARK, assessing the shape (flatness) of the rent by the formula

Syi=Ypi×Ynoi=ly;

Sxi=((Ynoi+Xnoi)/2)× (Xpi-Ypi)=Ix;

S=Sxi+Syi=I;

SARK(i, j)=I

1/z
(i, j)
or (logi(i, j)SARK(i, j))× z(i, j)=1,

where Ypi- coordinate line brightest point within the range of projection of the light beam in the i-th point along the width of the rental;

Xpi- coordinate line the most extreme points of the light beam projection extending from the zone of measurement in the i-th point along the width of the rental;

Ynoinormalized coordinate line brightest point within the range of projection of the light beam in the i-th point along the width of the rental;

CVDithe normalized coordinate of the line's most extreme points of the light beam projection extending from the zone of measurement in the i-th point along the width of the rental;

Z(ij) is the value of the sum of the coordinates Ynoiand Xnoi.

These characteristics are essential and mutual is linked with the formation of a stable set of essential features, sufficient to obtain the desired technical result.

The present invention is illustrated by a specific example, which, however, is not only possible, but clearly demonstrates the possibility of obtaining the desired technical result.

Figure 1 is a diagram of the scanning system relative to the rolled strip, top view;

figure 2 same as figure 1 is a, side view;

figure 3 - scheme of decomposition of video into its constituent lines;

figure 4 - illustration of the calculation of the sum of the coordinates of Zni;

figure 5 illustrates the geometric interpretation;

6 is a graph comparing the speed signal with Wi reference value (first reference example);

Fig.7. - same as figure 6, a second example of the Etalon;

Fig - same as figure 6, a third example of the Etalon;

According to the present invention, the laser control over the shape of rolled strip is to scan the surface of the rolled strip in its transverse direction of the light beam, defining a set of parameters of the individual points of this beam at the surface and comparing these parameters with the reference. When scanning perform the scan of the light beam in a straight line with the provision of the projection of the beam on the surface of the rolled strip, and then carry out the capture zone of the projection data is th beam on the land surface and points nearby the edges of the rolled strip, break a measurement light beam on a specified number of intervals and for each interval the received video image is decomposed into its constituent points, respectively forming a line of the most extreme points of the light beam projection included in the measurement zone, the line of the most striking points within the area of projection of the light beam and the line of extreme points of light beam projection extending from the zone of measurement, to determine their coordinates along the surface of the car, produce a normalized coordinate lines brightest points within the zone of measurement and the most extreme points of the light beam projection extending from the zone of measurement, and determine the value of the sum of the coordinates, which is the resultant velocity of the normalized optical coordinate at which the given coordinates of the lines of the most striking points within the zone of measurement and the most extreme points of the light beam projection extending from the zone of measurement, by the geometric interpretation define the generalized form parameter rolled strip SARK(i, j)according to the following formula:

Syi=Ypi×Ynoi=ly;

Sxi=((Ynoi+Xnoi)/2)× (Xpi-Ypi)=Ix;

S=Sxi+Syi=I;

SARKi, j)=I

/table> or (logi(i, j)sark(i, j))× z(i, j)=1,

where Ypi- coordinate line brightest point within the range of projection of the light beam in the i-th point along the width of the rental;

Xpi- coordinate line the most extreme points of the light beam projection extending from the zone of measurement in the i-th point along the width of the rental;

Ynoinormalized coordinate line brightest point within the range of projection of the light beam in the i-th point along the width of the rental;

CVDithe normalized coordinate of the line's most extreme points of the light beam projection extending from the zone of measurement in the i-th point along the width of the rental;

Z(i, j) is the value of the sum of the coordinates Ynoiand CVDi.

Below is a specific example of the method of the present invention.

The proposed method consists in the following.

To implement the method uses a scanning system is presented in figure 1 and 2. The laser light source 1, the optical beam sweep in a straight line 2, which is projected on the surface of the laminate (controlled) metal 3.

The receiver system 4 produces the capture zone of projection of the laser beam 5 on the test surface and point 6 of the nearby edge of the rolled strip. As the source of laser radiation is applied gliniany hole is R GN, GUN with built in him a mirror lens, which produces a scan of a laser beam in a straight line, and the thickness of the sweep is adjustable from 4 to 12 mm depending on the requirements of the conditions of rolling and measurements, such as high-speed operation mode, the background illumination and the other as a receiving system is any system video capture card, which allows the surveillance range of the controlled strip in real time with a frequency of 25-50 Hz, the transmission of information in the processing unit computing machinery (not shown). As computing equipment used personal computer, equipped with a unit receiving and digitizing the image with the corresponding software, implemented in accordance with a preset algorithm processing data.

The received video projection of the laser beam is decomposed into the following components line (figure 3):

- “O” - line the most extreme points of the projection laser beam, which is included in the measurement zone;

- “Y” - a line of the most striking points within the zone of measurement;

- “X” is the line most extreme points of the projection laser beam emerging from the zone of measurement.

Then is a breakdown of the projection area of the laser beam at the i intervals across the width of the car. Moreover, the number of intervals split across the width can be from 0 to 600, and b is more depending on the angles of the scanning system and the characteristics of the receiving system.

Is eat coordinates, the components of the laser projection lines:

- Yo(i, j)- coordinate line “Y” in the i-th point along the width of the car and in the corresponding j-th point along the length of the rental;

- Xo(i, j)- coordinate line “X” in the i-th point along the width of the car and in the corresponding j-th point along the length of the rental;

- Yp(i, j)- coordinate line “Y” in the i-th point along the width of the car and in the corresponding j-th point along the length of rental (origin of coordinates so);

- Λp(i, j)- coordinate line “X” in the i-th point along the width of the car and in the corresponding j-th point along the length of rental (origin of coordinates so);

- Yh(j)- coordinate edge (1, 2, pos.6) along the length of the car in the j-th point, which characterizes the change in thickness (longitudinal profile).

Evaluation values for each of the divided intervals i is carried out by the maximum value within the i-th interval, the average value within the measured range, standard deviation within the measured interval.

Standardization of the optical values of Hoiand Uoiis calculated by the formula

CPi=(HoiHomin)/Homin,

Yni=(Yoi-Yomin)/Yomin,

where Hominand Yomin- the minimum value of the respective coordinate across the entire width of the rolled metal.

The calculation of values su is maruosa coordinates Zn i(figure 4), the physical meaning which reflects the resulting speed horizontal CPiand vertical Ynicomponent, carried out by the formula

Zni=(CP

1/z
(i, j)
2
i
+Yn
2
i
)0,5.

Next is the geometric interpretation (figure 5) and the calculation of the generalized parameter SARK(i, j), which measures the shape (flatness) of hire:

Syi=Ypi×YnOi=ly;

Sxi=((Ynoi+Xnoi)/2)× (Xpi-Ypi)=Ix;

S=Sxi+Syi=I;

SARK(i, j)=l

1/z
(i, j)
or (logi(i, j)SARK(i, j))× Z(i, j)=1.

Indicators SARK(i, j)and Yhjare the system, characterizing the profile, shape and flatness of the rent that allow you to visualize the form and are the source data for proper process control. They can also be used as a source (input) data in the automated systems of regulation and control.

However, the proposed method on animati surface quality of rolled material and surface defects. This is feasible in the case when the area controlled by the width of the car divided by the maximum number of areas (m&γτ; 200).

Parameter SARK is used to correct process control by regulating the form of rent. Using a detection of moving objects is a spatial-temporal filtering parameter SARK algorithm:

determination of the absolute values of Laplacian Li by the formula

Li(SARK)=SARKii, (j+1)-2× SARKi (j)+SARKi, (j-1),

where (j+i), (j), (j-i) three consecutive time in the i-th point on the width of the rolled strip;

- determination of the speed of the image signal Wi by dividing the threshold values of the Laplacian, past spatio-temporal filtering, the time interval during which happened offset

Wj=l(i, j)(SARK)/τ ;

τ =3/Vskan,

where τ the time within which changed three measured values:

(j+i, j and j-1):li(SARK).

This is followed by binarization values Wi by setting threshold values obtained. Values less than the threshold Q is assigned binaryboy level “O”, values equal to and more than a given threshold Q is assigned binaryboy level “1”.

Next, the obtained values of the speed signal Wi the i-th that is ke width of the car is converted to longitudinal axis j, and comparing with one of the three standards (6, 7, 8).

The correct process control comparing with the developed standards is made by identifying the actual values Wi at minorityowned level with the appropriate standard, the decision to use a particular standard and regulation (feedback). Operational feedback can be carried out by purely thermal, power, or joint profiling rolls.

Purely thermal profiling is done in the case of a chaotic arrangement of certain standards for the width of the rolled strip. In the area of identification with the first pattern (6) (cut lanes in the i-th point) decreases the supply of coolant mill roll with 50% (nominal) up to 25% in the corresponding width of the rolled strip nozzle, thus is the local increase in diameter of the work roll and the elongation of the strip at this point (thermal profiling rolls). The mode of operation of the injector is returned to the source (the nominal value is 50%) when identifying the actual values Wi third pattern (Fig) (ideal or acceptable on minorityowned level value). In the area of identification with the second pattern (Fig.7) (elongation of the strip in the i-th point) is led is an increase in the supply of coolant mill roll with 50% (nominal) up to 75% in the corresponding width of the rolled strip nozzle, so is the local reduction of the diameter of the work roll and the shortening of the strip at this point (thermal profiling rolls). The mode of operation of the injector is returned to the source (the nominal value is 50%) when identifying the actual values Wi third pattern (Fig) (ideal or acceptable on minorityowned level value). As follows from the above, in the area of identifying the actual values of Wi with the third pattern (ideal or acceptable on minorityowned level value) injector delivers the cutting fluid at a nominal level (e.g., 50%, depending on the rolling conditions nominal level and the level of correction can be adjusted initial setup process).

Power profiling rolls are made in the following cases. The width of the rolled strip is conventionally divided into three equal sections (left, middle and right side) and the corresponding finding standard in the area that is 50% or more cases, or when in serial 30% or more in the transverse direction of the applied force profiling: an additional bend (first reference) or the bending of the work rolls (second reference).

If you cannot resolve the defects and the yield on a given form (third pattern) over time 7-15 seconds, is combined thermal and si the new profile, moreover, the priority channel regulation in this case is the power profiling, and then joint.

The recorded values of the form and its adjustment to a file or other source of archived information, the proposed method also allows for the initial setting of rolling mill: mechanical shaping and roughness of the rolls, the processing lubricant, entered into the additives and other

The laser control over the shape of rolled strip, which consists in scanning the surface of the rolled strip in its transverse direction by a laser beam, determining the set of parameters of the individual points of this beam at the surface and comparing these parameters with the reference value, wherein when the scan enable projection of the laser beam on the surface of the rolled strip, carry out the capture of the projection of the beam on the surface of the rolled strip and points nearby the edges of the rolled strip, the resulting video image projection of the laser beam is divided into a specified number of intervals along the width of rental and for each interval the received video decompose on line the most extreme points of the projection beam included in the projection line brightest pixels within the projection beam line the most extreme points of the projection beam, leaving them from the zone of measurement, and make removal of the coordinates of the lines and then by the saved coordinates calculate the generalized parameter SARK, assessing the shape (flatness) of the car.



 

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FIELD: laser control technologies.

SUBSTANCE: method includes sweep of light beam to straight line with providing for projection of this beam on surface of rolled strip, video capture of projection area of current beam on portion of controlled surface and point of nearby edge of rolled strip, projection area is separated on given number of ranges and for each range received image is separated on components, forming respectively line of edge points of beam light projection, being portion of measurement area, line of brightest points inside light beam projection range and line of edge points of beam projection, quitting measurement area, to determine their coordinates along rolling strip surface, coordinates of lines of brightest points and edge points within light beam projection are straightened, and value of total coordinate is determined, from which with consideration of coordinates of points of lines of brightest points within light beam projection, by geometric interpretation, total parameter of rolled strip shape SARK(i,j) is determined.

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