JPS5928892A - Load balance controller for different speed rolling - Google Patents

Abstract

PURPOSE:To enable to roll at stable different speed by separately detecting the voltages, currents and rotating speeds of motors for driving upper and lower work rolls and outputting correction signals to a speed control circuits to hold the balance of loads. CONSTITUTION:A load balance controller 16 obtains upper and lower work roll speed correction signals ST, SB from upper and lower work roll revolutions nT, nB, motor voltages eT, eB for driving upper and lower work rolls, and currents iT, iB. Then, upper and lower work roll speed controllers 19, 20 convert current variations into speed variations by the signals ST, SB, add them to the set speeds from upper and lower work roll speed setters 17, 18, and output speed control references of upper and lower work roll Leonard units 12, 13. In this manner, even if rollings of different speeds are performed, a load balance is adjusted to stably perform rolling work.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to different speed rolling in which a material is rolled by varying the circumferential speed of upper and lower work rolls. The present invention relates to a load lance control device for rolling at different speeds to maintain the lance at the lance.

[Technical background of the invention]

Conventionally, when rolling a material using a rolling mill, a pair of upper and lower work rolls is generally operated at a constant speed.

In this case, the material is only subjected to a rolling process to reduce its thickness.

In recent years, materials have been rolled by a rolling-pulling process in which drawing is added to the rolling process.

This rolling force method is performed with a difference in the circumferential speed of the upper and lower work rolls, reducing the rolling load compared to the previous uniform speed rolling method. It is clear that there are some advantages.

By the way, when a pair of upper and lower work rolls are driven by separate electric motors and are operated at a constant speed, it is necessary to maintain the speed of the upper and lower work rolls at the set constant speed. The control device detects the current of the other motor and the current of its own motor as a speed control means, and adds nine charge lance control so that the difference between the two is zero.

This is a control method that is possible because the voltages of the electric motors for driving the upper and lower work rolls are equal to each other, and by controlling the load balance of the upper and lower rolls, the load imbalance between the upper and lower rolls is eliminated. It is well known that stable rolling is possible and productivity is improved.

[Problems with background technology]

However, when rolling at different speeds, the speeds of the upper and lower work rolls and the current and voltage of the electric motor are different from each other. To perform the load/S lance from the detected current of the roll motor,
It is difficult to carry out this process because it involves load lancing while maintaining different speeds.

[Purpose of the invention]

It is an object of the present invention to provide an apparatus that overcomes the storage problem of conventional means and performs load nollance control in different speed rolling while maintaining the speeds of upper and lower work rolls at preset different speeds in different speed rolling. is its purpose.

[Summary of the invention]

The present invention provides a separate Leonard system (ig) for controlling the electric motors driving the upper and lower work rolls to provide different speed standards for the upper and lower work rolls in a fully equipped variable speed rolling mill. .

A device is installed to detect the current and rotation speed separately for each of the two and the bottom work rolls, and the torque of the upper and lower work rolls is determined by the detection signals introduced from these detection devices, and the load of the soil and lower work rolls set in advance is determined. )Up to maintain S-lance,
This is the power of the two-lance control device for different speed rolling that outputs a correction signal to the speed control circuit of the lower work roll.

[Embodiments of the invention]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

First, the configuration of the drive device for the upper work roll 2 will be explained.

The upper work roll drive electric motor 4 of the drive mechanism for the upper work roll 2 that rolls the material 1 together with the lower work roll 3 is controlled by an upper work roll Leonard device 12 .

An upper work roll rotation speed detector 6 is attached to the earth work roll driving electric motor 4 to detect the rotation speed of the upper work roll 2. A work roll drive motor voltage detector 8 is provided in the main circuit of the upper work roll drive motor 4 to detect the voltage of the lower work roll drive type II machine 4. The upper work roll drive motor main power supply circuit 14 is provided with an upper work roll drive motor current detector 10 to detect the current of the upper work roll drive motor 4.

Next, the configuration of the drive device for the lower work roll 3 will be explained.

The configuration of the drive 11rl+i array'' of the lower work roll 3 is similar to the configuration of the drive device for the ten work rolls 2 described above.

That is, the lower work roll drive electric motor 5 that drives the lower work roll 3 is connected to the lower work roll Leonard device 13.
controlled by A lower work roll rotation speed detector 7 is attached to the lower work roll driving electric motor 5 to detect the lower work roll 30 rotation speed. A lower work roll drive motor voltage detector 9 is provided in the main circuit of the lower work roll drive motor 5 to detect the voltage of the lower work roll drive motor 5. The lower work roll drive motor main power supply circuit 15 is provided with a lower work roll drive motor current detector 11,
The current of the electric motor 5 for driving the lower work roll is detected.

The rotational speed 1'#1'r, pressure and current of the lower work roll detected in this way are taken into the load/2 lance control device i, 16, and from these signals the load/2 lance control device 16 derives a correction signal and outputs it to the upper work roll speed control circuit 19 and the lower work roll speed control circuit.

The upper work roll speed control circuit 19 uses the speed set by the upper work roll speed setter 17 and the correction signal from the load/ζ lance control device N16 to set the speed control standard for the -F work roll reochi 1 device rν12. Output.

In addition, the lower work roll speed control circuit 201. Based on the speed set by the lower work roll speed setter 18 and the correction signal from the load balance control device 16, a speed control standard is output to the lower work roll Leonardo device 13.

Here, the effect of the present invention will be mentioned.

FIGS. 2(a) and 2(b) are characteristic waveform diagrams of rotation speed and torque.

The upper and lower work roll rotation speed detectors 6 and 7 detect,
The rotation speed of the lower work roll 2.3 is nT and nB1, respectively.
The voltages of the upper and lower work roll drive motors 4 and 5 detected by the upper and lower work roll drive motor voltage detectors 8 and 9 are eT and eB1, respectively.

Lower work roll drive function 1 mine first flow detector 10,
If the detected currents of 11 are iT and iB, respectively,
Torque τ of the upper work roll and torque TBI-1 of the lower work roll: respectively expressed as (1 formula) and (2 formula) 6, Xi τ = kB B ・・・・・・・・・・・・(2
(Formula) where k is a constant of proportionality.

In normal constant speed operation, the motor voltage eT for driving the upper work roll in (1 formula) and the motor voltage eB for driving the lower work roll in (2 formula) are set equal, and the rotation speed nT of the upper and lower work rolls is set equal. , nE are equal, so (Equation 1)
In order to take the upper and lower loads and ζ lances so that , (2 formulas) are equal, the soil and lower work roll drive 'city motion'
Speed control circuit J9 detects minute changes in turtle flow iT and iB
Alternatively, a correction signal is sent to the controller.

Results・Rotation speed n and torque τ in Figure 2 (a) and (b)
As in mode I in the waveform, the rotational speeds of the upper and lower work rolls and the torques of the second and lower work rolls are equal.

However, in the case of different speed rolling, the motor voltage eT, eB1 for driving the upper and lower work rolls, the number of rotations of the upper and lower work rolls T, nB, and the motor currents for driving the soil and lower work rolls iT, iB, respectively. It's different. - As an example, the number of rotations of the upper work rolls nT, nB and soil.

Lower work roll torque τ1. τoha Figure 2 (a)?
(b) rotation speed n,) motor rI in the waveform of torque τ
[I am in a state like this.

Therefore, in order to cause the upper and lower work rolls to lance smoothly under such conditions, it is sufficient that (Equation 1) and (Equation 2) are equal, and a correction signal must be output so that Equation (3) holds true. Bye.

In FIG. 1, the load/lance control device 16 is shown at the top.

Upper and lower work roll rotation speeds nT and nB1 from lower work roll rotation speed detectors 6 and 7 Upper and lower work roll drive motor voltages eT and eBl from upper and lower work roll drive motor voltage detectors 8 and 9 and above.

Upper and lower work roll drive motor currents IT from lower work roll drive motor current detectors 10 and 11.

By substituting iB into (Equation 3), for example, if the change in current is used as a correction signal and the lower work roll drive motor current iB is used as a reference, the lower work roll speed control direction! i! The lower work roll speed correction signal sB to 820 is expressed by (Equation 4).

sB= iB-IB −〇 ・・・・・・・・・・・・・・・ (4
The soil work roll speed correction signal ST to the upper work roll speed control circuit 19 is calculated from Sunzu (formula 3) by ζ
The current value of the motor for driving the upper work roll to maintain the balance is derived as shown in equation (5), and from the difference between this value and the motor current for driving the upper work roll that is actually detected, it is calculated as shown in equation (6). The upper work roll speed correction signal ST is determined.

s-i'-i (6 formulas) In this way, soil and lower work roll speed correction signals ST, SB
Accordingly, the upper and lower work roll speed control circuits J9 and 20 convert the current change into a speed change and add it to the set speed from the upper and lower work roll speed setters 19 and 20.
A speed control reference is output to each of the lower work roll Leonard devices 12 and 130. As a result, even when rolling is performed at different speeds, the load and ζ lance are adjusted and stable rolling is performed.

Therefore, in Fig. 1, the number of rotations of the upper and lower work rolls,
Although the installation positions of the respective detectors for the electric motor voltage for driving the upper and lower work rolls and the electric motor current for driving the upper and lower work rolls are shown, the present invention is not limited thereto.

Furthermore, the speed correction signal is above in the previous embodiment.

It was derived from the motor current for driving the lower work roll, but (3
If formula) is applied, the result is the same even if other factors are derived from the upper and lower work roll drive motor voltages or the upper and lower work roll rotational speeds.

〔Effect of the invention〕

Thus, according to the present invention, even when performing different speed rolling, it is possible to maintain the speeds of the upper and lower work rolls at preset different speeds, and to perform stable different speed rolling with a balanced load. An apparatus that can fully utilize the advantages of different speed rolling can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a characteristic waveform diagram of the rotation speed and torque of the work roll. 1...Utilization 2...Upper work roll 3...Lower work roll 4...Upper work roll drive electric motor 5...Lower work roll drive electric motor 6...Upper work roll rotation speed detection Instrument 7...Lower work roll rotation speed detector 8...Upper work roll drive motor voltage detector 9...
- Lower work roll drive motor voltage detector 10... Upper work roll drive motor current detector 11... Lower work roll drive motor current detector 12... Lower work roll remenade device 13... -F work roll Leonard device 14... Upper work roll drive electric motor main power circuit 15... Lower work roll drive electric motor upper 1b, source circuit 16... Square charge parameter/parameter control device 17... Upper work Roll speed setting device 18...Lower work roll speed setting device 19...Soil work roll speed control circuit 20...Lower work roll speed control circuit. Applicant's Representative Kiyoshi Inomata Figure 1 Survival Awakening Setting Speed Setting

Claims (1)

[Claims] 1. For each of the upper and lower work rolls, an electric motor for driving the work roll, a work roll rotation speed detector, a Leonard device surface for controlling the electric motor, and a device for controlling the electric motor by the Leonard device. A motor voltage detector detects the applied motor voltage and the Leonard device causes the motor to flow 11f! a motor current detector for detecting the current to be generated; a work roll speed control device for providing a work roll speed control reference to the Leonard device; and a speed setting device for applying a set speed to the work roll speed control device. In the rolling mill, the number of revolutions of the upper and lower work rolls is nl. nB1 upper and lower work roll drive motor voltages eT. eB1 upper and lower work roll drive motor current IT. 1B and introduce these detection signals. A method of different speed rolling characterized in that the equation 0% of torque relating to the lower work roll is calculated and a speed correction No. 48 that satisfies the above equation is applied to the upper and lower work roll control devices. Load/lance control device.