JP3586374B2 - Plate thickness control device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a thickness control device, and more particularly to a thickness control device for a cold rolling mill for rolling a metal plate.
[0002]
[Prior art]
With reference to FIG. 6, the thickness control of the conventional cold rolling mill will be described. In FIG. 6, an arrow 101 indicates a rolling direction. 102 is a rolled material such as a steel plate, 103 is a rolling mill, 104 is an incoming bridle roll, 105 is an outgoing bridle roll, 106 is an incoming thickness gauge, 107 is an incoming speed meter, 108 is a shift register, and 109 is FFAGC operation. Reference numeral 110 denotes a hydraulic pressure reduction device. The rolled material 102 is conveyed from the entrance bridle roll 104 to the exit bridle roll 105, and is rolled to a predetermined thickness by a rolling mill 103 controlled by a hydraulic pressure reduction device 110 on the way. The control of the sheet thickness is performed by obtaining the inlet-side sheet thickness deviation information ΔHin from the inlet-side sheet thickness gauge 106 for measuring the sheet thickness before entering the rolling mill 103 and the inlet-side speed Vin from the inlet-side sheet speed meter 107, and Is calculated so that when the rolled material at the measuring point comes directly below the rolling mill 103, the control speed ΔS required for pressing for rolling is given to the hydraulic pressure reduction device 110 so that the transfer speed is adjusted. Is controlled by a signal obtained by performing an arithmetic process involving tracking. The FFAGC operation unit 109 performs an operation process for this. The arithmetic expression is as follows.
ΔS = G · α · ΔHin
Here, G is a control gain, and α is an influence coefficient depending on a rolling schedule. As described above, in the rolling control, there is a time delay from the point at which the rolled material 102 comes to the position immediately below the rolling mill 103 from the thickness measurement point. You need to be able to understand.
[0003]
[Problems to be solved by the invention]
As described above in the conventional manner, the thickness measurement of the strip to perform a pre-stage of rolling, so had become in the basic data of speed measurement to perform control of processing and the hydraulic pressure device FFAGC, It was difficult to control the plate thickness with high accuracy. The present invention has been made to solve the above problems.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the present invention, the inlet side speed Vin is set to other factors according to the principle of constant mass flow at the outlet side thickness h of the rolled material, the outlet side speed Vout, the inlet side plate thickness Hin and the inlet side speed Vin. The thickness of the rolling mill is controlled based on the result obtained from the measurement data.
[0005]
Further, in order to solve the above problem, in the present invention, the speed of the rolled material obtained from the output bridle roll rotation speed is set as the output speed Vout, and the entry speed Vin is obtained based on the principle of constant mass flow, and based on the calculation result, The thickness control of the rolling mill was performed. In order to solve the above-mentioned problem, in the present invention, the speed of the rolled material obtained from the output-side sheet speed meter is set as the output-side speed Vout, and the entry-side speed is obtained in accordance with the principle of a constant mass flow. Thickness control. Further, in order to solve the above problem, one of the speed of the rolled material obtained from the outlet bridle roll rotation speed and the speed of the rolled material obtained from the outlet plate speedometer is selected as the outlet speed Vout, and the mass flow is fixed. The entrance speed Vin is obtained in accordance with the principle, and the thickness control of the rolling mill is performed based on the calculation result.
[0006]
Further, in order to solve the above-mentioned problem, the entrance speed Vin is calculated from the exit speed Vout obtained by providing a winding motor for controlling the transport speed of the rolled material at the exit bridle roll in accordance with the principle of constant mass flow. The thickness of the rolling mill is controlled based on the calculated result. Further, in order to solve the above problem, in the present invention, the outlet side thickness Vin of the rolled material, the outlet side speed Vout, the inlet side speed Vin in accordance with the principle of constant mass flow at the inlet side plate thickness Hin and the inlet side speed Vin, and the like. In the one that determines the thickness of the rolling mill based on the result from the measurement data of the measurement data of the elements and controls the thickness of the rolling mill, the drive motor of the output bridle roll is controlled, and the output speed is controlled to be constant. In the entrance bridle roll, the product of the entrance side plate thickness and the entrance side speed is controlled to be constant.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
Embodiment 1 will be described with reference to FIG. In FIG. 1, 1 is a rolling direction, 2 is a rolled material, 3 is a rolling mill, 4 is an entrance bridle roll, 5 is an exit bridle roll, 6 is an entrance thickness gauge, 8 is a shift register, and 9 is a FFAGC calculation unit. Reference numeral 10 denotes a hydraulic pressure reduction device, reference numeral 11 denotes an output-side plate thickness gauge, and reference numeral 12 denotes an entrance-side speed detection circuit that determines an entrance-side speed based on a constant law of mass flow. Next, the operation will be described. The entrance speed Vin during rolling is calculated from the exit speed Vout, the measurement value h of the exit thickness gauge, and the entrance thickness Hin, based on the constant law of mass flow, as Vin = (h / Hin) · Vout.
Is required. Note that Hin is obtained by the entrance thickness gauge 6 , h is obtained by the exit thickness gauge 11 , and Vout is obtained by the rotation speed of the exit bridle roll 5.
In this way led to FFAGC calculating unit 9 the entering-side velocity Vin determined, the hydraulic pressure device 10 to generate the rolling force hydraulic pressure device 10 necessary for the rolling of the entry-side speed detecting portion of the strip The control amount is calculated. Then, the hydraulic pressure reduction device 10 is controlled based on the calculation result. In this embodiment, since it is not necessary determined by measuring the entry-side speed of the rolled material directly, accurately prompted entry side speed, result accuracy higher thickness control becomes possible as.
[0008]
Embodiment 2 FIG.
Embodiment 2 will be described with reference to FIG. 2 that are the same as in FIG. 1 indicate the same or corresponding parts. In FIG. 2, reference numeral 13 denotes a delivery side plate speed meter. Also in this embodiment, the delivery speed is measured directly by the delivery speed meter. As in the first embodiment, the system detects the entrance speed based on the constant mass flow rule. However, there is an advantage that errors due to slip and the like which are problematic when measuring with the exit bridle roll can be avoided.
[0009]
Embodiment 3 FIG.
Embodiment 3 will be described with reference to FIG. 3, the same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts. In FIG. 3, reference numeral 7 denotes an entry-side plate speedometer, and reference numeral 14 denotes an automatic switching unit. As the output speed signal to the input speed detection circuit 12, signals from the output bridle roll 5 and the output plate speedometer 13 are drawn in, and are switched according to the situation. As for the entry side speed Vin, data directly measured by the entry side plate speedometer 7 and data obtained by the entry speed detection circuit can be switched and used depending on the situation. It has the effect of taking a so-called backup system.
[0010]
Embodiment 4 FIG.
Embodiment 4 will be described with reference to FIG. 4, the same reference numerals as those in FIGS. 1, 2 and 3 denote the same or corresponding parts. In FIG. 4, reference numeral 15 denotes a motor for controlling the rotation speed of the exit side bridle roll 5 to control the exit side speed to a constant speed, 16 denotes a drive control device thereof, and 17 denotes a speed detector for detecting the speed. . A closed loop is provided between the motor 15, the speed detector 17, and the drive controller 16, and controls the outlet speed to be constant. When such control of the exit-side speed constant speed, the mass flow constant rule, at the stage of thickness at delivery side is stabilized by FFAGC, becomes the entering-side velocity Vin · thickness at entrance side Hin = constant, thickness deviation of the entrance side Since it is only necessary to absorb the deviation in the form of the entrance speed, an instantaneous correction can be made by the high-speed response characteristic of the entrance bridle roll, and there is an effect that the thickness accuracy can be improved.
[0011]
Embodiment 5 FIG.
Embodiment 5 will be described with reference to FIG. 5, the same reference numerals as those in FIGS. 1, 2, 3, and 4 denote the same or corresponding parts. In FIG. 5, reference numeral 18 denotes a motor for controlling the rotation speed of the entrance side bridle roll 4 to control the entrance side speed to a predetermined speed; 19, a drive control device thereof; and 20, a speed detector for detecting the speed. . Between the motor 18 and the speed detector 20 and the drive controller 19 have become closed loop, and calculates and controls so that the entry-side speed (entry side speed Vin · thickness at entrance side Hin = constant). With this control the entry-side speed to a predetermined speed, the mass flow constant rule, at the stage of thickness at delivery side is stabilized by FFAGC, (entering-side velocity Vin · thickness at entrance side Hin = constant), and the thickness of the entry side Since the deviation may be absorbed in the form of the deviation of the entrance speed, an instantaneous correction can be made by the high-speed response characteristic of the entrance bridle roll, and there is an effect that the thickness accuracy can be further improved.
[0012]
【The invention's effect】
As described above, the thickness control system for a cold rolling mill according to the present invention, in accordance with the Ma Sufuro constant rule out and side thickness and the delivery side speed and the thickness at entrance side to seek entry-side speed, this input Since the thickness control is performed based on the side speed , an error in directly measuring the entrance speed is reduced, and as a result, the effect of increasing the accuracy of the thickness control can be obtained.
[0013]
In addition, since the outlet speed is directly measured, errors due to slippage of the bridle roll can be reduced. In addition, since the rotation speed of the bridle roll is controlled so as to keep the outlet speed constant, control of the FFAGC is facilitated, and high precision control becomes possible. In addition, by controlling the speed by the drive motor of the entrance bridle roll so that the product of the entrance side speed Vin and the entrance side plate thickness Hin becomes constant, the accuracy of the plate thickness control can be further improved.
[Brief description of the drawings]
FIG. 1 is a configuration diagram according to a first embodiment of the present invention.
FIG. 2 is a configuration diagram according to a second embodiment of the present invention.
FIG. 3 is a configuration diagram according to a third embodiment of the present invention.
FIG. 4 is a configuration diagram according to a fourth embodiment of the present invention.
FIG. 5 is a configuration diagram according to a fifth embodiment of the present invention.
FIG. 6 is a configuration diagram of a conventional plate thickness control device.
[Explanation of symbols]
1 rolling direction, 2 rolled material, 3 rolling mill, 4 entrance bridle roll,
5 Outgoing bridle roll, 6 Inlet thickness gauge, 7 Inlet speedometer,
8 shift register, 9 FFAGC operation unit, 10 hydraulic pressure reduction device,
11 Outlet thickness gauge, 12 Inlet speed detection circuit, 13 Outlet speedometer,
14 automatic switching unit, 15 motor, 16 drive control circuit,
17 speed detector, 18 motor, 19 drive control circuit,
20 Speed detector.

Claims (6)

A rolling mill that rolls a rolled material stretched between an entrance bridle roll and an exit bridle roll by a drafting force from a hydraulic drafting device, an entrance speed Vin, an entrance plate thickness Hin, and corresponding portions of the rolling mill. An input speed detector configured to detect the input side speed Vin by calculation without directly measuring based on the relationship of (Vin · Hin) = (Vout · h) in the output side speed Vout and the output side plate thickness h, A computing unit that computes and outputs a control signal for a hydraulic pressure reduction device to generate a reduction force required for rolling of a corresponding rolled material portion from the entrance thickness Th and the entrance speed Vin detected from the input speed detector. And a sheet thickness control device. A control signal for calculating and detecting the entrance-side speed Vin using the exit-side speed Vout determined from the rotation speed of the exit-side bridle roll, and generating a reduction force required for rolling the corresponding rolled material portion by the hydraulic pressure reduction device. 2. The thickness control apparatus according to claim 1, further comprising a calculation unit for calculating and outputting the following. A hydraulic pressure reduction device is used to calculate and detect the entrance speed Vin using the exit speed Vout obtained by directly measuring the speed of the exit rolled plate, and to generate a reduction force required for rolling the corresponding rolled material portion by the hydraulic pressure reduction device. 2. The thickness control apparatus according to claim 1, further comprising: a calculation unit for calculating and outputting a control signal. The entrance speed Vin is calculated and detected using the exit speed Vout obtained by selecting from the rotation speed of the exit bridle roll and the speed of the exit rolled plate, and the rolling force required for rolling the corresponding rolled material portion. 2. The sheet thickness control device according to claim 1, further comprising: a calculation unit for calculating and outputting a control signal for generating the pressure reduction by the hydraulic pressure reduction device. The entrance side speed Vin is calculated and detected using the exit side speed Vout obtained by controlling the rotation speed of the exit side bridle roll to a constant speed, and the hydraulic pressure reduction device generates a reduction force required for rolling the corresponding rolled material portion. 2. The sheet thickness control device according to claim 1, further comprising: a calculation unit for calculating and outputting a control signal for performing the control. A rolling mill that rolls a rolled material stretched between an entrance bridle roll and an exit bridle roll by a rolling force from a hydraulic pressure reduction device, and a motor that controls the rotation speed of the exit bridle roll to a constant speed. a control device comprising, based on the relationship in the entering-side speed Vin and thickness at entrance side Hin and the side plate out with the delivery side speed Vout of the corresponding portion thickness h of the rolling mill (Vin · Hin) = (Vout · h), the entry side An input speed detector configured to detect the speed Vin by calculation without directly measuring the input speed, and a product of the rotation speed of the entrance-side bridle roll obtained by the entrance- side plate thickness Hin and the entrance-side speed Vin obtained from the entrance- side speed detector. motor and, more and entering-side thickness Hin and entering-side velocity Vin detected from the input speed detector, rolling force necessary for rolling in the corresponding rolling material portion but controlled so as to constantly maintain Gauge control apparatus characterized by comprising a calculating unit for calculating a control signal for the hydraulic pressure device generates.

Images