JPS5820312A - Device for automatic thickness-control in rolling mill - Google Patents

Abstract

PURPOSE:To control deviation from a tolerance of the thickness, at the tip part of a material to be rolled, to be minimum, by correcting a lock-on value basing on the deviation between a measured thickness value in the exit at the lock-on time and a target value. CONSTITUTION:When a lock-on is completed, an output of a speed detector 14 connected to rolls 1 is taken into a distance meter 15 to start a counting of the time required until a rolling part of a material 2 reaches a thickness gauge 6 located at the exit side. The gauge 6 at the exit side detects a deviated value of an actual measured value from a target value of a material 2' to output it to a storing circuit 7. The circuit 7 stores the deviated value at the time when the meter 15 detects that the rolling part of the material 2 at the lock-on time reaches the gauge 6. Accordingly at this point of time, the deviated value is inputted to an amplifier 12 through a counter 8 to correct the lock-on value so as to make the deviated value zero. When the lock-on value is corrected, the meter 15 is reset to start the measuring again and to repeat said action after correcting the lock-on value.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thickness control device KsD for a rolled material rolled in a roll rolling mill, and more specifically, a rolling mill suitable for controlling to the shortest possible thickness tolerance deviation at the tip of the rolled material at the start of rolling. This invention relates to an automatic thickness control device.

The automatic thickness control device of conventional rolling mills measures the thickness of the material after rolling, detects the deviation between this measured value and IIS*, integrates this detected value over time, and calculates the rolling thickness based on the Nine Confucians. The rolling position of the rolling mill and the rolling reaction force are adjusted to continuously bring the thickness of the rolled material closer to the recommended value.

However, in the conventional automatic thickness control device of a rolling mill as described above, the material progresses between the rolling roll and the thickness needle.
The inherent drawback is that the response is delayed by the amount of time required to control the thickness, making continuous thickness control very unstable. Further, the pigeonhole which integrates the deviation between the thickness -811 constant value and the target value also has the disadvantage that the phase delay of the integrator promotes the above-mentioned response delay.

The present invention eliminates the instability of thickness control, improves responsiveness, and eliminates the drawbacks of the conventional automatic thickness control device of a rolling mill as described above, and improves the tip of the rolled material at the start of rolling. It is an object of the present invention to provide an automatic thickness control device for a rolling mill that minimizes the deviation of the thickness O1 of a portion from the standard value.

The automatic thickness control amount of the rolling mill of the present invention includes a roll position detector that detects the rolling position of the roll, a roll rolling reaction force detector that detects the rolling reaction force of the roll, and a roll exit side of the rolled material. The thickness of the rolled material is determined based on the deviation of both the lock-on value and the detected value by checking the rolling reaction force of the roll and the roll position. A device that controls the temperature to a target #, and is limited to the time when the rolled part of the material at the time of lock-on reaches the exit thickness gauge.
A circuit is provided for correcting the lock-on value based on the deviation between the measured thickness of the rolled material and the target value.

The present invention will be described in more detail below with reference to embodiments shown in the accompanying drawings.

The attached drawing shows one embodiment of the present invention, in which a material 2 is rolled as shown at 2' by four rolls IK arranged above and below. The output of the roll position detector 3 that detects the vertical position of the roll 1 is directly transmitted to the amplifier 12.
The output of the rolling reaction force detector 4 which detects the rolling reaction force of the roll 1 is inputted to the amplifier 1112 via the coefficient unit 5.

The vertical position of the roll 1 is adjusted by the rolling position 11.
The lowering device 11 is driven by a drive device 10 operated by a power source 9 that receives the output of an amplifier 12 and varies the output voltage.

When lock-on is performed, the lock-on amplifier 1
3 operates, and the amplifier 13 holds its output at a constant value once lock-on is completed.

Therefore, even if the thickness of material i2 on the entry side changes thereafter,
The above-mentioned parts work together to maintain the thickness of the material 2' on the exit side at a constant value.

When the lock-on is completed, the output of the speed detector 14 connected to the roll IK is 11KJl! Introduced □Re,
Counting of the time at which the rolled portion of the material 2 at the time of rolling reaches the outlet thickness gauge 6 is started. The exit thickness gauge 6 detects the deviation value between the target thickness value and the actual measured value of the material 2',
Output to the memory circuit 7.

The memory circuit 7 stores the material 2 at the time when the distance meter 15 is locked on.
At the time when it is detected that the rolled portion reaches the outlet thickness gauge 6, the deviation value is stored. Therefore, at this point, the deviation value is input to the amplifier 12 via the coefficient multiplier 8, and the lock-on value is corrected so as to make this deviation value zero.

When the lock-on value is corrected, the distance meter 16 is reset, starts measuring again after the lock-on value is corrected, and repeats the above operation.

Incidentally, the coefficient value of the coefficient unit 5 is determined by the characteristics of the rolling mill.

The coefficient value of the coefficient multiplier 8 is determined by the characteristics of the material 2. If both are set appropriately, the lock-on value only needs to be corrected once, and the exit thickness deviation can be kept within the target value.

As is clear from the above description, according to the present invention, the deviation correction of the rolled part of the material at the time of lock-on is performed so that the rolled part of the material at the time of lock-on is at the installation position Ki of the exit side thickness gauge.
'IJ:I is executed immediately, so it is possible to shorten the rolled material whose thickness deviates from the target value to the shortest possible length. Furthermore, unlike the conventional method, the output of the outlet thickness gauge is integrated, the lock-on value is continuously corrected, and the thickness is gradually brought closer to the target II value, so the material after rolling is It is possible to eliminate instability factors caused by the time delay until reaching the outlet thickness gauge and the phase delay due to integration, and this has the effect that the outlet thickness is quickly set to the target value.

[Brief explanation of drawings]

The attached drawing is a block diagram showing one embodiment of the present invention. 1... Roll, 2. 2'... Material, 3... Roll position detector, 4-w-roll rolling reaction force. Detector, 5.8...
Coefficient unit, 6... Output side thickness gauge, 7... Memory circuit, 9.
...power supply, io-...drive device, 11...download device,
12...Amplifier, 13-...Lock-on amplifier. Agent Patent Attorney Masami Akimoto

Claims (1)

[Claims] A roll position detector that detects the rolling position of the l and wx-ru, a roll rolling reaction force detector that detects the rolling reaction force of the roll, and an exit side thickness needle that detects the thickness of the rolled material on the exit side of the four-ru. Automatic thickness control of a rolling mill, which locks on the rolling reaction force of the roll and the roll position, and controls the thickness of the rolled material to a target 11 based on both the deviation of the roll-on temperature and the detected value. The device is a device that is capable of determining the deviation between the measured value of the exit side thickness at the time of Tsukuo y and the target thickness value of the exit side, and
An automatic thickness control device for a rolling mill, characterized in that it comprises a circuit for correcting the rotational thickness II based on the deviation.