JPS5825524B2 - Yonjiyuyuyuatsushikiatsuenki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a quadruple hydraulic rolling mill equipped with a control device for quickly and accurately setting or correcting the roll gap.

Conventionally, in a rolling mill in which the rolling separation force is supported by a hydraulic cylinder through the bearing surface of the back roll of a quadruple rolling mill, and the hydraulic pressure is adjusted according to changes in the thickness of the rolled plate, the roll gap is adjusted by a control device. However, various systems have been proposed for the control device.

In other words, a gap detector is provided between the rolling stand and the shaft surface of the lower backing roll to control the roll gap, or a bar-shaped gap detector is provided between the bearing surfaces of the upper and lower backing rolls to control the roll gap. There are several methods to perform this, but all methods require correction based on a number of unforeseen factors such as deformation of the bearing surface, deformation of the stand, eccentricity of the upper and lower support rolls, and fluctuations in hydraulic pressure. However, this method has disadvantages in that the mechanism is complicated.

The present invention aims to eliminate the above-mentioned conventional drawbacks, and a roll gap setting screw mechanism is set directly between the upper and lower work roll bearing surfaces, and the roll gap and hydraulic pressure are adjusted via a load cell for detecting the screw load. The above-mentioned problems are solved by making it possible to control.

The roll gap control device of the present invention will be explained below based on the drawings.

FIG. 1 shows a four-layer rolling mill represented by the reference numeral 1, and a roll stand 4 having upper and lower backing rolls 2a, 2b and bearing surfaces 3a, 3b thereof has a bearing surface 3 of the upper and lower backing rolls.
Upper and lower work rolls 5a and sb and bearing surfaces 6a and 6b that support them are guided between a and 3b.

Cylinder pins 9a, 9b supported via cylinders 8 on a support plate 7 fixed to the stand wall are inserted into both sides of the upper and lower work roll bearing surfaces 5a, 6b.

The cylinder blocks 9a and 9b have cylinders 1 that support the upper and lower roll bearing surfaces 3a and 3b in the vertical direction.
0, and a support cylinder 1 in the left and right direction relative to the stand wall.
1 are provided, and upper and lower work roll bearing surfaces 6a and 5b are supported by these directional support cylinders.

A bushing up cylinder 12 as a rolling down device is provided at the lower part of the lower backing roll bearing surface 3b, and a pass line adjustment device 13 is provided at the upper part of the upper backing roll bearing surface 3a.

In the quadruple rolling mill 1 constructed as described above, a roll gap setting screw mechanism represented by the reference numeral 14 is provided between the bearing boxes 6a and 6b on both sides of the work rolls.

The roll gap setting screw mechanism 14 is connected to the lower work roll bearing surface 6
A threaded rod 17 is screwed into a hole provided at the axial center position of b to a nut 16 whose vertical movement is regulated by a cover 15 so that its tip can come into contact with the lower edge surface of the upper work roll bearing surface 6a.
is erected (see Figures 2 and 3).

The nut 16 is screwed into a worm 19 of a pulse motor 18 attached to the side wall of the bearing surface 6b, and the nut 16 is rotated by the rotational drive of the pulse motor 18, whereby the threaded rod 17 is moved up and down.

Further, a compression type load cell 20 for detecting the screw load of the threaded rod 17 is embedded in the upper work roll bearing surface 6a where the tip of the threaded rod 17 of the roll gap setting screw mechanism 14 comes into contact.

In this way, the change in plate thickness during rolling is controlled by the roll gap calculation and control device provided via the roll gap setting screw mechanism 14 set on the upper and lower work roll bearing surfaces 6a and 6b and the load cell 20 that detects the screw load. Alternatively, the desired roll gap and roll reduction blade can be set and controlled by a command to change the plate thickness.

Next, the arithmetic and control device described above will be explained with reference to FIG. 4. First, a roll gap zero point setter 22 in a calculator 21 sets the gap zero point according to the roll diameter used, and a desired roll gap setting value according to the rolled plate thickness is set by the setter 22. The signal is also input to the arithmetic unit 21 via 24.

As a result, the pulse motors 18, 18 of the roll gap setting screw mechanisms 14, 14 provided on both sides of the lower roll bearing surface 6b are driven via the power amplifier 25 in response to a command from the calculator 21. Natsu 16.1
6 rotates to raise the threaded rods 17, 17 that are threaded thereto, thereby pushing up the upper work roll bearing surface 6a to a desired roll gap setting value.

At this time, the rotational speed of each nut 16, 16 is read by a pulse transmitter (not shown), and the pulse transmission is inputted to the calculator 21 via the adder 26 and comparator 24, and the desired roll gap is set. is checked and displayed.

This procedure is the same when changing the roll gap due to a change in plate thickness during rolling, and if the changed setting value is input again to the calculator 21, it will be automatically changed via the pulse motors 1B and 18.

Next, the threaded rod 17 of the roll gap setting screw mechanism 14, 14
, load cell 20.20 set at the tip position of 17
The detected values of the screw load are sent to the adder 27 and converter 28, respectively.
In addition, the bushing up cylinder 12 for rolling down is operated by a servo valve 29 in response to a command from the computing unit 21 in order to obtain a predetermined rolling blade.

In order to keep the difference between the rolling blade and the actual rolling force at a predetermined value, the difference between the screw load detected by the load cell 20 and 20 of the rolling blade detected by the hydraulic pressure detector 30 and the converter 31, or The actual rolling force value 32 is detected by the adder 33, the difference is inputted to the calculator 21 via the comparator 24, and the rolling blade of the bush-up cylinder 12 is corrected and controlled according to the command from the calculator 21. As a result, load cell 2
By keeping the screw load detected at 0.20 constant, the difference between the aforementioned rolling blade and the actual rolling force is controlled to always be a predetermined value.

In this case, if the roll flatness amount is large enough to affect the roll setting value, the roll flatness correction value 34 is input to the calculator 21 via the comparator 24 by the AGC signal for thickness correction, and the roll gap is The set value is corrected and controlled.

In the present invention, as described above, the roll gap setting screw mechanism 14 is provided between the upper and lower work roll bearing surfaces 6a and 5b, so that only the amount of bending of the rolls and the amount of roll flatness are considered, and each bearing surface, stand, hydraulic pressure, etc. Since no correction is required for error fluctuations due to fluctuations, etc., not only is the roll gap setting accurate, but the control method is also simple.

Furthermore, this control device not only detects the roll gap value, but also enables centralized automatic control using a computer, and when changing the plate thickness during rolling, it can be set extremely quickly and accurately and the rolling operation can be stopped. The work efficiency of the rolling line can be further improved because it can be continued without any trouble.

Furthermore, the detected pressure is controlled to a constant level by a load cell, and the rolling blade of the bush-up cylinder is controlled according to the actual rolling force, so the load applied to the roll gap setting screw mechanism is small, and the pulse motor, load cell, etc. are also of small capacity. It is fully possible.

In addition, both ends of the work roll bearing surface are supported horizontally by hydraulic cylinders made up of cylinder blocks that support the backing roll bearing surface, making it easy to offset the work rolls and also allowing rolling mill operation. The device that is driven in the forward and reverse directions has the advantage that not only can the backlash of the work roll that occurs during the conversion be easily adjusted, but also that the reference position of the work roll can be easily set.

Incidentally, the connection of cables to the rolling mill in these control devices is very easy because a plug-in connector is used, and there is no problem in workability.

In addition, since computing units and other control devices are mainly placed in remote locations where they are not affected by heat and are controlled remotely, maintenance, service life, and
Both improve significantly.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a quadruple rolling mill according to the present invention, Fig. 2 is a sectional view taken along line II-I in Fig. 1, and Fig. 3 is a sectional view taken along line B-B in Fig. 1.
The line sectional view and FIG. 4 are block diagrams showing the control circuit of the roll gap setting control device. 1...Rolling mill, 2...Upper and lower backing rolls,
3... Upper and lower holding roll bearing surfaces, 4... Roll stand, 5... Upper and lower work rolls, 6...
... Upper and lower work roll bearing surface, 9 ... Upper block, 12 ... Bush up cylinder, 14 ... Roll gap setting screw mechanism, 16 ...
...nut, 17...screw rod, 18...
...Pulse motor, 20...Load cell, 2
1... Arithmetic unit, 22... Roll gap zero point setting device, 23... Roll gap setting device, 24.
...Comparator, 26, 27, 33...
Adder, 29... Servo valve, 30...
Hydraulic pressure detector.

Claims (1)

[Claims] 1. A pair of upper and lower work roll bearing surfaces is supported between a pair of upper and lower backing roll bearing surfaces provided on a roll stand via a pressure adjustment cylinder, and a pair of upper and lower work rolls is supported through hydraulic cylinders respectively attached to the bearing surfaces. In a quadruple hydraulic rolling mill that adjusts the hydraulic pressure of each cylinder according to changes in the thickness of the rolled plate material to be passed through, both ends of the work roll bearing surface are horizontally moved by hydraulic cylinders constituted by cylinder blocks of the hydraulic cylinder. a nut that supports the work rolls and is rotatable at a fixed position on one side of the mutually opposing work roll bearing surfaces, and is screwed onto the nut and rotates as the nut rotates;
It is equipped with a threaded rod that moves in and out of the work roll bearing surface on the other side to adjust the distance between both bearing surfaces, and a pulse transmitter that counts the number of rotations of the nut, and the amount of protrusion of the threaded rod is determined by the signal from this transmitter. On the other hand, a load cell is provided on the bearing surface of the other work roll to detect the screw load by coming into contact with the tip of the threaded rod, and furthermore, according to changes in the plate thickness during rolling or an external command to change the plate thickness, the load cell is A quadruple hydraulic rolling mill characterized by comprising a control device that controls the hydraulic pressure of a bushing up cylinder to bring the screw load detected by a load cell to a predetermined value.