KR20010060795A - Method for Telescope Measurement and Determination of Telescope Shape - Google Patents

Abstract

PURPOSE: A method for measuring telescoped degree of a hot rolled coil and a method for judging telescope shape of a hot rolled coil are provided to track causes for facility malfunctioning according to the coiled shape, and operate control system at once when telescope is generated by collecting and analyzing accurate data during generation of telescope for data base. CONSTITUTION: The method for measuring telescoped degree of a hot rolled coil comprises the steps of measuring profile of the side surface of a hot rolled coil with a displacement sensor; setting the calculation range of telescope within points of 1/2 thickness of the hot rolled coil inwardly respectively from inner and outer coil edge points by the profile; and determining a telescoped degree from a difference between maximum value and minimum value within the calculation range. The method for judging telescope shape of a hot rolled coil comprises the steps of defining sectors in multi-stages in the order of from an inner coil starting point to an outer coil starting point using the profile data; calculating the maximum value of each sectors; and judging the overall telescope shape by comparing maximum values of each of the sectors with flaw standard values set in advance, thereby judging whether each sectors are projected or not.

Description

Method for measuring telescope amount and telescope shape of hot rolled coil {Method for Telescope Measurement and Determination of Telescope Shape}

The present invention relates to a method for measuring a telescope amount and a telescope shape of a hot rolled coil, and more particularly, to a telescope amount measuring method capable of precisely measuring a side shape of a hot rolled coil and to database it. It is about how to judge.

Generally, quality control items related to the shape of hot rolled products include flatness, telescope, cumber, and the like. FIG. 1 is a comparison diagram of a coil coiled normally and a coil having a telescope generated. The telescope is a portion indicated by the symbol a in the right drawing of FIG. 1, which is a hot rolled coil wound while being pushed in parallel with a winding shaft. This part is pushed out of the standard value.

However, when the above-described telescope occurs in winding of the coil, eccentricity is generated in the axial direction or the entry direction of the coil is not correct, and since then, the telescope is continuously generated and the amount thereof increases. Such a telescope-generated coil is not only inconvenient or impossible to store and move, but also has no commodity value as a final product and thus is treated as a product defect. And in order to eliminate such product defects, the coiled hot rolled coil must be completely unwound and re-wound again. This rewinding takes a lot of time and money. Therefore, it is necessary to accurately measure the telescope amount in order to prevent the occurrence of the telescope. In addition, since the direction of control varies depending on the shape of the telescope, it is also necessary to accurately determine the shape of the telescope.

Conventionally, there has been no apparatus or a method for measuring the generation amount and shape of the telescope as described above, and thus it is mostly performed by the human eye.

However, the measurement of the telescope amount and shape by the naked eye, as well as lack of accuracy, and even if the operator detects the occurrence of the telescope with the naked eye, automatic control could not be taken, therefore it was not possible to immediately deal with this. Since the cause of the shape defect could not be accurately tracked and solved, there was a problem that after the occurrence of the product defects, the product shape had to be corrected through follow-up measures.

The present invention has been made in order to solve the above problems, it is possible to trace the cause of the equipment failure according to the winding shape by collecting and analyzing accurate data when the telescope occurs, the operation of the control system immediately after the telescope occurs It is to provide a telescope amount measuring method and a telescope shape determination method of a hot rolled coil.

1 is a comparison diagram of a coil wound normally and a coil in which a telescope is generated

2 is a conceptual view of the installation of the sensor installed on the conveyor lower portion of the coil transfer line

3 is a configuration diagram of a device to which the measuring method and the shape determining method of the present invention are applied;

4 is a graph of winding side profile data collected at a displacement sensor;

5 is a graph showing sector division for determining a winding shape pattern.

<Description of Symbols for Major Parts of Drawings>

1: hot rolled coil 2: conveyor

3: displacement sensor 4: spraying air for surface protection

5: Sensor cooling injection air 6: Sensor protection device

7: sensor controller 8: monitoring computer

9: starting point of inner circle 10: starting point of outer circle

In order to achieve the above object, the apparatus to which the telescope amount measuring method of the hot rolled coil of the present invention is applied is largely as shown in the configuration diagram of FIG. 3, a device for protecting a sensor 6, a sensor controller 7, and a monitoring computer 8. It is composed of Here, the displacement sensor 3 installed in the sensor protection device 6 is installed in the lower part of the conveyor 2 as shown in the installation conceptual diagram of FIG. 2.

Telescope amount measurement method of the hot rolled coil of the present invention using the device as described above, the step of measuring the profile of the side of the hot rolled coil (1) with the displacement sensor (3), respectively by the profile inward from the inner and outer end points Setting the calculation range of the telescope within a half point of the thickness of the hot rolled coil 1, and determining the telescope amount from the difference between the maximum value and the minimum value within the calculation range.

The method for determining the shape of the telescope according to the present invention includes the steps of defining sectors in a multi-step order from the inner circle starting point 9 to the outer circle starting point 10 using the profile data, and calculating the maximum value of each sector. And determining the shape of the overall telescope by determining whether each sector is projected by comparing the maximum value of each sector with a preset defective reference value.

Hereinafter, the operation of the telescope amount measurement method and the telescope shape determination method of the hot rolled coil of the present invention will be described in detail.

The measuring device of the present invention comprises a sensor protection device 6, a sensor controller 7 and a monitoring computer 8. Here, the displacement sensor 3 installed inside the sensor protection device 6 is installed at the lower part of the conveyor 2, in consideration of the measurement range of the displacement sensor 3, at a preset position and height, the conveyor ( It is a sensor that can measure the distance to the hot rolled coil (1) side through the lower space of 2).

According to an embodiment of the present invention, the displacement sensor 3 may be configured by using a laser distance sensor to measure the telescope in a non-contact manner. At this time, the three-dimensional information is extracted by using a planar laser light and a CCD camera, and the distance is measured by measuring the position where the image is formed on the linear CCD and the laser spot light reflected by the object. That is, this method is to measure the winding shape by using a rangefinder using a laser point light based on the optical triangulation method widely used for industrial purposes. When the displacement sensor 3 is configured as a laser distance sensor as in the embodiment, the displacement sensor 3 has a surface protection injection air and a sensor cooling injection air 5 to protect the laser surface and to cool the sensor. Can be input.

The analog distance data generated by the displacement sensor 3 is collected by the sensor controller 7, converted into digital and then transmitted to the monitoring computer 8. Conventional means for communication are provided between the displacement sensor 3, the sensor controller 7, and the monitoring computer 8, wherein the monitoring computer 8 uses substantial distance data to collect substantial winding shape information. It is a means to calculate.

Meanwhile, in the method for measuring the telescope amount of the hot rolled coil of the present invention, the step of measuring the profile of the side of the hot rolled coil 1 with the displacement sensor 3 having the configuration as described above is performed every predetermined period. Since the profile data is an analog signal, it is converted into a digital signal by the sensor controller 7 and then input to the monitoring computer 8 to be collected.

At this time, the position of the edge of the inner and outer coils of the coil should be determined. The lowest point of the measured profile is defined as 0 as a reference point, and a point having a predetermined value, for example, 100 mm in the inner and outer windings is defined as an end portion. The end located in the inner circle is defined as an inner circle end point, and the point located in the outer circle is defined as an outer circle end point.

Next, the number of turns of the winding coil, that is, the number of turns, is calculated. The number of turns n can be obtained simply by the following simple calculation.

here Is the density of the steel, D _i is the coil inner diameter, W is the coil width, and t is the coil thickness.

When the number of turns n is calculated, the number of samples on the x-axis in FIGS. 4 and 5 can be converted into the number of turns.

The monitoring computer 8 then performs a step of setting the telescope's calculation range within the 1/2 point of the thickness of the hot rolled coil 1 from the inner and outer end points inward by the collected profile data. That is, the range for calculating the telescope is limited to within 1/2 of the thickness of the coil, respectively, inward from the inner and outer end points. Set the data range for the telescope calculation in the following way.

Inner circle start point = Inner circle end point-1/2 of coil thickness

Outer circle start point = Outer circle end point-1/2 of coil thickness

Telescope calculation range = Inner circle starting point ~ Outer circle starting point

This is a very important aspect in the telescope calculation, which means that the telescope calculates based on the end of the first wound coil in the inner and outer regions since the telescope shows the uneven state of the coil end.

Finally, the step of determining the telescope amount from the difference between the maximum value and the minimum value within the calculation range is performed. That is, when the calculation range is set, the telescope becomes the difference between the maximum value and the minimum value in the calculation domain.

Telescope Amount = Max-Min

On the other hand, in order to suppress the generation of the telescope, it is necessary to control the opposite direction in which the telescope is generated, and for this, it is necessary to grasp the shape of the telescope. However, it is difficult to determine the shape of the telescope only by the amount of the telescope as described above, and therefore, a method of separately determining the shape of the telescope is required. According to the present invention, in order to determine the shape of a telescope, first, sectors are defined in multiple steps from the inner circle starting point 9 to the outer circle starting point 10 using the profile data. In this case, the number of sectors may be approximately three or more of top, mid, and tail, but may not be divided at equal intervals as necessary.

Thereafter, calculating the angular sector maximum value. Here, the maximum value of each sector means the highest point-the reference point.

Maximum = Highest Point-Reference Point

And determining the shape of the telescope by comparing each sector maximum value with a preset bad reference value. Here, the maximum value of each sector is larger than the defective reference value means that the sector is relatively protruded.

According to an embodiment of the present invention, as shown in the graph showing sector classification for determining the winding shape pattern of FIG. 5, the top and mid sections are divided into four stages in the order of the inner circle starting point 9 to the outer circle starting point 10. Although 1, mid 2, and tail sectors are equally divided, the sectors can be finely set in order to define a more detailed shape pattern in practice.

Further, according to one embodiment of the present invention, when the maximum value is larger than the reference value in the determination of the telescope shape by comparing the maximum value of each sector with the reference value

1) If the maximum value of the top sector is larger than the bad reference value, the top defective,

2) If the maximum value of the tail sector is larger than the bad reference value, the tail type bad,

3) If both the maximum values of mid 1 and mid 2 are larger than the reference value, the zig-zag defect is

4) If the three types are not the same, it is determined as a defective bowl type.

Hereinafter, the operation of the present invention having the configuration as described above.

After winding, the hot rolled coil 1 is conveyed by the conveyor 2 provided in the coil transfer line. At this time, the displacement sensor 3 installed in the lower part of the conveyor 2 operates to measure the distance to the side surface of the hot rolled coil 1 every cycle and transmit it to the sensor controller 7. At this time, the sensor controller 7 converts an analog signal into a digital signal and inputs it to the monitoring computer 8, which collects and stores all data.

Then, the monitoring computer 8 determines the inner and outer winding end positions of the hot rolled coil 1 to determine the inner and outer winding end points, calculates the number of turns of the hot rolled coil 1, and then determines the telescope calculation range. .

The maximum value and the minimum value exist in the calculation range, and the telescope amount can be calculated by subtracting the minimum value from the maximum value.

On the other hand, in order to determine the shape of the telescope generated as described above, the area between the inner circle start point and the outer circle start point is divided into a plurality of sectors, the maximum value of each sector is calculated, and the maximum values are compared with each bad reference value. In this case, if the maximum value is larger than the defective reference value, this means a protruding portion, and thus, the sector portion is a protruding telescope. In this case, subdividing the sector into a more detailed shape can be seen.

The propagation data accumulated during the telescope amount measurement and the telescope shape determination process may be stored in a database in the monitoring computer 8, which may be processed into input data of a control system to prevent future telescope generation. Can be used as direct control data. In addition, by analyzing the database can identify the cause of the telescope to eliminate the root cause can be used as a long-term equipment maintenance data.

4 is a graph of winding side profile data collected at a laser displacement meter. This is a calculation of the output signal of the sensor as an actual physical quantity, which is set so that the upper surface of the conveyor 2 is zero, which is a measurement reference plane. Shown in the graph is a single side of the coil side, showing the profile between the inner diameter and the outer diameter. The telescope can be assessed only by examining one edge, provided that the coil is axisymmetric about the center of the coil.

Therefore, according to the present invention, accurate data can be collected and analyzed when a telescope is generated, and a database can be traced to cause the cause of facility failure according to the winding shape. Accordingly, a control system is immediately activated to prevent further telescope generation. Therefore, by improving the cause of the telescope to prevent the occurrence of subsequent failures to reduce the failure rate, thereby reducing the work time and cost reduction is a very significant effect.

Claims (3)

Measuring the profile of the side of the hot rolled coil (1) with the displacement sensor (3), and by means of the profile the telescope's calculation range within the half point of the thickness of the hot rolled coil (1), respectively, inward and outward from the end point. And setting the telescope amount from the difference between the maximum value and the minimum value within the calculation range. Using the profile data of claim 1 to define sectors in a multi-stage order from the inner circle starting point 9 to the outer circle starting point 10; calculating the maximum value of each sector; The method for determining the telescope shape of the hot rolled coil, characterized in that it comprises the step of determining the overall telescope shape by judging whether each sector is projected compared to the defective reference value. The method according to claim 2, wherein the sector is divided into four stages in the order of the inner circle starting point (9) to the outer circle starting point (10), and is equally divided into the top, mid 1, mid 2, and tail sectors. In the determination of the telescope shape by comparison with the reference value, when the maximum value is larger than the reference value, 1) If the maximum value of the top sector is larger than the bad reference value, the top defective, 2) If the maximum value of the tail sector is larger than the bad reference value, the tail type bad, 3) If both the maximum values of mid 1 and mid 2 are larger than the reference value, the zig-zag defect is 4) The method of determining the telescope shape of the hot rolled coil, characterized in that it is configured to determine that the ball is defective if not the three types.