JPH09300019A - Method for detecting residual length of coiled plate on unwind side in plate rolling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily control a rolling speed, and to improve productivity by measuring the inside and the outside diameters of a coil on the unwind side during rolling the plate by a noncontact system displacement gage, and correctly operating the residual length of the coil according to its area and the plate thickness of the coil. SOLUTION: When successively unwinding a rolled plate 2 from the coil 3 held by an unwind spool 30 and rolling it by a rolling device 1, the noncontact system displacement gages 7 and 70 are installed at a certain distance near the coil 3 on the unwind side, and (the change of) the outside diameter of the coil 3 is measured by the displacement gage 7 on one side, and (the change of) the inside diameter of the coil 3 is measured by the displacement gage 70 on the other side. After processing the detected outputs of the respective displacement gages 7, 70 to signals with prescribed levels, they are inputted into an arithmetic unit 8, operated outputs are inputted into a controller 9, and also they are outputted to an output device such as a display device, etc. After that, the speed of a motor M, that is, the speeds of the work rolls 10 of a rolling mill are controlled by the controller 9 according to the output of the arithmetic unit 8 or a command from an input device 90.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting the unwinding side coil plate residual length in plate rolling,
More specifically, for automatically controlling to slow down and stop the rolling mill with a decrease in the remaining length of the incoming plate in strip rolling,
The present invention relates to a method for detecting the remaining length of a coil plate on the rewinding side.

[0002]

2. Description of the Related Art The rotation of a roll of a rolling mill cannot be decelerated and stopped at once. Therefore, when rolling the plate while unwinding the coil wound on the uncoiler (rewinding side coil), when the plate remaining length of the unwinding side coil decreases to a predetermined value or less, the rolling speed is reduced at a predetermined ratio,
At the end of deceleration, control is performed so that the remaining plate length of the unwinding side coil becomes the minimum required length (minimum required length for tension to act on the plate being rolled, for example, about 2 to 3 turns). Preferably. The reason for this is that if the coil plate runs out during deceleration, so-called slip-out trouble occurs (in the case of slip-out, various troubles occur because tension does not act on the plate and the rear end becomes free). Because. On the other hand,
At the end of deceleration, the remaining plate is passed through the rolling mill at an extremely low speed.However, the low speed plate passing portion reduces productivity because of the low speed, and since tension does not act, the quality is likely to be poor ( This is because a predetermined length portion of the end having poor quality is cut off). In order to control the remaining coil length of the coil on the rewinding side to the minimum required length at the end of deceleration of the rolling roll, the timing of deceleration start, the selection of the deceleration rate, or the correction of the deceleration rate must be adjusted on the rewinding side. Since it is necessary to carry out according to the remaining coil plate length, it is important to more accurately detect the remaining plate length of the rewinding side coil during rolling (particularly after starting deceleration).

The conventional means for detecting the remaining plate length of the rewinding side coil is as follows. The first is a method of calculating the remaining plate length based on the number of revolutions of the rewinding side spool (uncoiler), the entering side plate speed, the rewinding side coil diameter, and the plate thickness of the coil. Secondly, the unwinding side coil rotational speed detected during rolling is sequentially subtracted from the coil winding number obtained beforehand based on the coil plate thickness and the coil diameter before the start of rolling, and the remaining coil winding number and the coil plate at the time of detection are obtained. This is a method for calculating the remaining plate length based on the thickness. Thirdly, the unwinding-side coil winding number detected during rolling is sequentially subtracted from the unwinding-side coil winding number based on the information from the previous process, and the remaining coil length based on the remaining coil winding number and the coil plate thickness at the time of detection. Is a method of calculating.

[0004]

The conventional detection method described above has the following problems. That is, in the first method, the entrance-side plate speed is usually measured by the number of rotations of the deflector roll (or pinch roll), but slippage between the plate and the roll occurs, so that a measurement error is likely to occur. When the entry side plate speed is calculated from the rolling speed and the reverse speed, it is difficult to accurately predict the reverse speed, so that a detection error is likely to occur. It is also possible to measure the incoming plate speed with an optical plate speedometer that does not cause slip between the detection means and the plate, but this is a large-scale facility and there are restrictions on installation conditions, as well as the use of rolling oil and Measurement errors are likely to occur due to generation of fumes. The influence of the measurement error of the entrance side plate speed on the remaining plate length detection by these various means increases in proportion to the size of the coil length. According to the second method, the number of coil windings, which is the first basis for calculation, is influenced by the plate thickness measurement error in the previous process and the influence of components such as abnormal plate thickness existing at the winding start portion and winding end portion of the coil. Therefore, the error in detecting the remaining plate length is likely to increase. According to the third method, it is often the case that the information of the previous process is not accurately transmitted due to a plate edge portion being cut off after the rolling due to a processing defect during the rolling of the previous process or other causes, or a mistake in information transmission. Therefore, the detection error of the remaining plate length is likely to increase.

It is an object of the present invention to more accurately detect the remaining sheet length of the unwinding side coil during strip rolling or after the reduction of the rolling speed in strip rolling is started. An object of the present invention is to provide a method for detecting the remaining length of a coil plate on the rewinding side, which can contribute to improving the property.

[0006]

The method for detecting the remaining length of the coil plate on the rewinding side according to the present invention has the following structure in order to solve the above-mentioned problems. That is, claim 1
According to the detection method, the inner diameter and the outer diameter of the rewinding side coil are measured by a non-contact type displacement gauge, respectively, and are orthogonal to the axial center of the coil obtained from the difference between the measured inner and outer diameters of the coil. The remaining plate length of the unwinding side coil is calculated based on the cross-sectional area and the plate thickness of the coil.

In the detection method according to a second aspect of the present invention, the diameter of the rewinding side coil is measured at each of a plurality of positions by a non-contact type displacement meter, and the average value of the measured diameters of the coil is obtained as a basis. It is characterized in that the plate remaining length of the rewinding side coil is calculated based on the cross-sectional area orthogonal to the axis of the coil and the plate thickness of the coil.

In the method of the present invention, it is preferable to use, for example, a laser displacement gauge as the non-contact displacement gauge. 3. The detection method according to claim 2, wherein the non-contact displacement gauges installed at a plurality of locations are a pair of displacement gauges that measure the outer diameter and the inner diameter of the coil, respectively, or measure only the outer diameter of the coil. It does not matter even if it is a displacement meter. This is because the inner diameter of the coil is substantially equal to the outer diameter of the spool, and in the latter case, the cross-sectional area of the coil can be obtained by subtracting the outer diameter of the spool from the measured outer diameter of the coil.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a coil plate residual length detecting method according to the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 is a block diagram for explaining an example of a detection method according to the present invention.

1 is a mill stand consisting of a pair of work rolls 10 and 10 and backup rolls 11 and 2, and 2 is a rolled plate of aluminum alloy rolled by the work rolls 10 and 10. There may be a plurality of mill stands 1 installed along the pass line of the rolled plate 2.
The rolled plate 2 is sequentially rewound from the rewinding side coil 3 held by the rewinding spool 30, and the rewinding side roll 3 is rewound.
After passing through the mill stand 1, it passes through the exit-side reflector roll 5 and is successively taken up by the take-up spool 6.

In the vicinity of the rewinding side coil 30, non-contact type displacement gauges 7 and 70 composed of laser displacement gauges are installed at a fixed distance from each other, and one of the non-contact type displacement gauges 7 is arranged.
Is measuring the outer diameter (change) of the rewinding side coil 3, and the other non-contact displacement gauge 70 is measuring the inner diameter (change) of the coil 3. The detection outputs of the non-contact type displacement gauges 7 and 70 are signal-processed to a predetermined level and then input to the arithmetic unit 8, and the arithmetic output of the arithmetic unit 8 is input to the control unit 9 as well as the display unit and the recording unit. It is output to the output device 80 such as a device. The control device 9 controls the speed of the work roll 10 through the motor M according to the output of the arithmetic device 8 or a command from the input device 90.

In the embodiment of FIG. 1, the non-contact type displacement gauges 7 and 70 continuously measure the inner and outer diameters of the rewinding side coil 3, and the arithmetic unit 8 uses the following equation (1) each time. The plate remaining length L of the coil 3 is calculated. L = π (R ² −R ₀ ² ) / H (1) where R = coil outer diameter (radius) R ₀ = coil inner diameter (radius) H = coil plate thickness

As described above, when the plate remaining length of the unwinding side coil 3 continuously calculated by the arithmetic unit 8 starts deceleration of the rolling mill 1 at a predetermined deceleration rate, the coil 3 is terminated at the end of deceleration. When the number of sheets of No. 2 has reached the spool 30 for two to three turns, the control device 9 starts deceleration of the rolling device 1 through the motor M at a preset deceleration rate. When the plate remaining length of the coil 3 calculated after the start of deceleration is a length that cannot be decelerated to the minimum speed at the deceleration rate set at the start of deceleration, the control device 9 increases the deceleration rate by the motor M. Is controlled, and in the opposite case, the motor M is controlled so as to reduce the deceleration rate.

According to the first embodiment, since the non-contact type displacement gauges 7 and 70 are used for detecting the diameter of the coil 3, the rolling plate 2 is not damaged. Generally, the non-contact type displacement meter is easily affected by temperature and humidity, and if the unillustrated rotating shaft of the rewinding side coil 3 is eccentric, the amount of eccentricity affects the measurement result. According to the method, since the inner diameter and the outer diameter of the coil 3 are measured by the two displacement gauges 7 and 70, the influence of temperature and humidity and the influence of the eccentricity of the rotating shaft of the coil can be further reduced. According to the first embodiment, the inner and outer diameters of the rewinding side coil 3 are continuously measured,
Since the plate remaining length of the coil 3 is calculated based on the measurement result, the previous measurement error is eliminated by new measurement and calculation, and the actual detection error is smaller. For the reasons described above, the deceleration start of the rolling mill and the correction of the deceleration rate can be performed in a timely manner, so that the plate remaining length of the rewinding side coil 3 at the time of deceleration stop can be further shortened,
The productivity of strip rolling is significantly improved.

Second Embodiment FIG. 2 shows a second embodiment of the device for explaining the detection method according to the present invention. In this embodiment,
Non-contact type displacement gauges 71 and 72 composed of laser displacement gauges are installed at different positions of the rewinding side coil 3, and these non-contact type displacement gauges 71 and 72 respectively measure the outer diameter of the coil 3. The inner diameter R _{0 of the} coil 3 is measured in advance before the start of rolling, or is determined by the diameter of the spool 30 used.

In the second embodiment, the arithmetic unit 8 calculates the remaining plate length L of the rewinding side coil 3 by the following equation (2) every time the detected main force signal is input from the non-contact type displacement gauges 71 and 72. I am calculating. _{L = π [(R 1 +} R 2/2) 2 -R 0 2] / H ···· (2) where the coil outer diameter by measuring R ₁ = displacement gauge 71 (radius) R ₂ = displacement meter 72 Coil outer diameter (radius) R ₀ = Coil inner diameter (radius) H = Coil thickness

According to the second embodiment, the rewinding side coil 3
Is measured by the non-contact type displacement gauges 71 and 72 installed at two places, and the plate length of the coil 3 is calculated by averaging the measurement results. The detection error of is likely to be smaller. Other configurations, operations, and effects are almost the same as those of the first embodiment, and therefore their explanations are omitted.

Third Embodiment FIG. 3 shows a third embodiment of the apparatus for explaining the detection method according to the present invention. In this embodiment,
Non-contact type displacement gauges 71, 72, 73 composed of laser displacement gauges are installed on three sides of the rewinding side coil 3, and these non-contact type displacement gauges 71, 72, 73 continuously measure the outer diameter of the coil 3, respectively. I'm measuring. The displacement meter 73 is a backup displacement meter. The inner diameter R _{0 of the} coil 3 has been measured in advance before the start of rolling, or the spool 3 to be used
It is determined by the diameter of 0.

In the third embodiment, the arithmetic unit 8 calculates the remaining plate length L of the rewinding side coil 3 almost in the same manner as in the second embodiment every time the measurement information is input. However, when the detection output of the non-contact type displacement diameter 71 or 72 is a value (abnormal value) outside a preset predetermined range, the displacement diameter 73 is used unless the output of the backup displacement gauge 73 is an abnormal value. Instead of the output of 71 or 72, the output of the displacement gauge 73 for backup is adopted to calculate the remaining plate length L.

According to the third embodiment, the rewinding side coil 3
Of non-contact type displacement gauges 71, 72, which are installed at three diameters
When the detection output of the displacement diameter 71 or 72 measured by 73 is an abnormal value, the output of the displacement meter 73 for backup is adopted instead of the detection output of the displacement meter showing an abnormal detection output. The detection error of the remaining plate length is further reduced. Other configurations, operations, and effects are almost the same as those of the second embodiment, and therefore their explanations are omitted.

Other Embodiments Non-contact displacement gauges 71 and 72 in the second embodiment, and
Non-contact displacement gauges 71, 72, 73 in the third embodiment
May use a non-contact displacement gauge in which different displacement gauges for measuring the outer diameter and the inner diameter of the rewinding side coil 3 are set. In each of the above-described embodiments, the non-contact displacement gauge 7,
The measurement of the diameter of the unwinding side coil 3 by 70 or 71, 72, 73 is continuously performed during the sheet rolling, and the remaining sheet length is continuously calculated based on the measurement results and the coil sheet thickness. However, the remaining sheet length may be detected intermittently at a predetermined time interval during rolling as long as there is no problem. Further, the detection of the remaining length of the incoming side plate may be started after the deceleration of the rolling mill is started or after the rolling is started at a preset timing (for example, the rolling speed is 2/3, 1 when the deceleration is started). It may be configured to be performed when it becomes / 3, ⅕). When the detection of the remaining sheet length is started after the deceleration is started, the deceleration start time is set in advance in the control device 9 based on the sheet length of the unwinding side coil 3 before the start of rolling and the average speed of the pass line. You can leave it.

[0022]

According to the plate remaining length detecting method of the first aspect, the following effects can be obtained. Firstly, by measuring the inner and outer diameters of the rewinding side coil continuously or intermittently at a predetermined timing and calculating the plate remaining length of the rewinding side coil based on the measurement result, the previous measurement error Is solved by new measurement and calculation, and the actual detection error becomes smaller. Secondly, the inner and outer diameters of the coil are measured with a plurality of displacement gauges, and the remaining plate length is calculated based on the measurement results, so that the measurement error is reduced even when the eccentric amount of the rotating shaft center of the coil is large. You can Thirdly, since a non-contact type displacement gauge is used to measure the inner and outer diameters of the coil, no contact scratch is generated on the rolled plate. Fourthly, by the first and second effects, deceleration start of the rolling mill, correction of the deceleration rate, etc. can be carried out in a timely manner, so that the remaining sheet length of the rewinding side coil at the time of deceleration stop becomes shorter. It is possible to contribute to remarkably improving the productivity of sheet rolling.

According to the plate remaining length detecting method of the second aspect, in addition to the first and third effects, the diameter of the rewinding side coil is measured by a non-contact type displacement meter installed at two or more places. Since the measurement results are averaged to calculate the remaining plate length of the coil, there is an effect that the detection error of the remaining plate length due to fluctuations or changes in the measurement environment is likely to be smaller.

[Brief description of drawings]

FIG. 1 is a block diagram of an apparatus for explaining an example of a plate remaining length detection method according to the present invention.

FIG. 2 is a partial block diagram of an apparatus for explaining another example of the remaining plate length detection method according to the present invention.

FIG. 3 is a partial block diagram of an apparatus for explaining still another example of the plate remaining length detection method according to the present invention.

[Explanation of symbols]

 1 Rolling device 10 Work roll 11 Backup roll 2 Rolling plate 3 Rewinding side coil 30 Rewinding side spool 4 Entry side deflector roll 5 Exit side deflector roll 6 Take-up spool 7, 70, 71, 72, 73 Non-contact type displacement Total 8 arithmetic unit 80 output unit 9 control unit 90 input unit M motor

Claims (2)

[Claims] 1. A cross-sectional area orthogonal to the axial center of the coil, which is obtained by measuring the inner diameter and the outer diameter of the rewinding side coil with a non-contact type displacement gauge and is obtained from the difference between the measured inner and outer diameters of the coil. And a plate remaining length of the unwinding side coil is calculated based on the plate thickness of the coil and a coil rewinding side coil plate remaining length in plate rolling. 2. The disconnection perpendicular to the axial center of the coil, which is obtained by measuring the diameter of the rewinding side coil at each of a plurality of locations with a non-contact displacement gauge, and based on the average value of the measured diameters of the coil. A method for detecting the remaining coil plate length on the unwinding side in plate rolling, wherein the remaining plate length of the unwinding side coil is calculated based on the area and the plate thickness of the coil.