JPH0225250A - Meandering control device for rapidly cooled thin metallic strip - Google Patents

Abstract

PURPOSE:To advantageously prevent the meandering which is liable to arise at the time of transportation of the thin strip by providing detectors for both end positions of the thin strip, tension detector, meandering quantity computing element, etc., to the inlet side of a steering roll disposed between the rapidly cooled thin strip and a take-up reel. CONSTITUTION:The moving command of the steering roll 1 is given to a hydraulic cylinder 10 by the meandering control gain computing element 7 in accordance with the meandering quantity detected by the detectors 2 provided on the outlet side of pinch rolls 4. The positions at both ends of the thin strip 3 on the outlet side of the rolls 4 is detected 2 on the inlet side of the roll 1 and the signal difference from the detectors 2, i.e., the meandering quantity of the strip 3 is calculated 11. This meandering quantity and the predetermined permissible meandering quantity from a setter 13 are compared and computed 14. The result of the above-mentioned comparison and computation is inputted as the meandering deviation output to the computing element 7 which multiplies said output by an adequate gain to obtain a meandering correction signal. On the other hand, the tension signal from the detector 2 and the information signal on the sheet thickness, steel kind, etc., from an upper CPU16 are inputted to the computing element 7 and the moving quantity of the roll 1 is adjusted by making determination of the meandering correction signal corresponding to the respective experimental conditions, etc.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a device for controlling meandering in conveying rapidly cooled metal ribbons (hereinafter referred to as ribbons) produced directly from molten metal, particularly at high temperatures, high speeds, and The purpose is to detect meandering of the ribbon conveyed under low tension at an early stage and take prompt and appropriate measures to avoid meandering to the extent that it impedes winding and threading of the ribbon.

(Prior art) Recently, there has been active research into the method of producing quenched metal ribbons directly from molten metal, and progress has been made in applying them to interesting materials such as amorphous alloys, high-silicon steels, and Ni-based super-superalloys. It is being In addition, various processes such as the single roll method, twin roll method, and melt drag method have been developed mainly by steel manufacturers, and some of them have been commercialized and even constructed plants.

However, there are various problems that need to be solved in order to manufacture this ribbon continuously and on an industrial scale, one of which is meandering during conveyance of the ribbon.

In other words, in order to continuously produce ribbons with a thickness of around 1 mm, it is necessary to rotate the cooling roll at a high speed with a circumferential speed of 0.1 to 10 m/s.
thickness or less and 1000~■200°C on the cooling roll exit side
Because of its low tensile strength and low elongation at high temperatures, it is difficult to apply the large tension required to wind it into a coil.

Therefore, the inventors previously proposed a tension dividing device using pinch rolls as described in Japanese Patent Application Laid-Open No. 61-88904. This device transports the material under low tension between the cooling roll and the pinch roll, and winds the material by applying an appropriate tension between the pinch roll and the take-up reel.

However, if the thin strip has thickness deviations or poor sheet shape (warping, edge elongation), meandering is likely to occur during transportation under low tension, and the meandering may cause the strip to be unable to pass or the winding shape to deteriorate. Trouble arose, and it was impossible to continuously manufacture large quantities of coils. Therefore, it became necessary to prevent the meandering of the ribbon as much as possible, and the conventional steering device that corrects such meandering is the Refnews Nα16, 19.
(See March 1982).

This device corrects the position of the ribbon by moving a roll around which the ribbon is wound. In order for the steering roll to function satisfactorily, it is desirable that the ribbon be wrapped around the guide roll over a range of 90 degrees or more, and that the meandering detection sensor be placed on the exit side of the steering roll. However, the temperature of the quenched ribbon after manufacturing is 700-12
Since the temperature is as high as 00°C and its strength is low, a large winding angle cannot be obtained. Furthermore, there is a take-up reel and a conveyance device on the exit side of the steering roll, making it impossible to measure on the exit side.

On the other hand, as another meandering control device, Japanese Patent Application Laid-Open No. 621013
No. 14 discloses a device that measures the thrust force of the strip and corrects the meandering, and JP-A-6310115 discloses a device that detects meandering at the entrance or exit side of the rolling roll and prevents meandering by correcting the rolling reduction. However, these are examples of attachments to hot strip mills, and the cooling rolls and pinch rolls do not perform rolling under high pressure.This control is required for the cold strip process, which involves directly producing strips from molten metal. Applying the device is futile.

(Problems to be Solved by the Invention) Therefore, an object of the present invention is to propose a control device that can effectively prevent meandering that is likely to occur during conveyance of a ribbon in a cold ribbon process.

(Means for Solving the Problems) The present invention comprises a pinch roll for feeding a rapidly cooled metal ribbon manufactured by rapidly solidifying molten metal on the surface of a cooling roll to a take-up reel, and a take-up reel for winding the thin metal ribbon. a steering roll arranged in a direction transverse to the conveyance line of the thin strip; a drive means that gives the steering roll a movement that changes the angle of intersection between the axis of the steering roll and the conveyance line; A meandering amount calculator is installed that detects the positions of both ends of the ribbon and a device that measures the tension applied to the ribbon, and further calculates the meandering amount by calculating the difference between the output signals from the detectors. The meandering control gain is calculated based on the width of the ribbon calculated by calculating the sum of the output signals of the measuring device, the tension added to the ribbon calculated from the output signal of the measuring device, and the amount of meandering calculated by the meandering amount calculator. This is a meandering control device for a rapidly cooled metal ribbon, comprising: a meandering control gain calculator that calculates the meandering control gain; and a control means that controls the displacement of the steering roll by the driving means based on the output from the meandering control gain calculator. .

(Function) Now, since the wrapping angle of the ribbon around the steering roll is only about 20 degrees at most, and it is necessary to measure the ribbon tension in the vicinity of the take-up reel, this invention uses a pinch roll and a take-up reel. A steering roll was installed between the reels, and a detector for detecting meandering was installed on the entry side of the steering roll. The reason why the steering roll is not installed between the cooling roll and the pinch roll is because the temperature of the ribbon is 1 in this area.
This is because the temperature is as high as 000 to 1200°C, and the strength of the ribbon is low, so low tension conveyance is performed, and the effect of meandering correction cannot be obtained sufficiently. In order to enhance this effect, it is conceivable to increase the winding angle of the steering roll or to increase the tension setting on the ribbon, but this is unsuitable because breakage easily occurs.

Furthermore, the ribbon during high temperature, high speed, and low tension conveyance systems has large meandering fluctuations, and the meandering correction effect differs depending on tension fluctuations and strip width changes. In order to address the above-mentioned problems, the present invention has been designed to detect the meandering of the ribbon at an early stage and provide a constant meandering control effect quickly and appropriately, regardless of variations in the sheet width or sheet tension.

(Example) Meandering control according to the present invention will be described below with reference to FIG. 1.

Figure (a) shows an example attached to a twin-roll quenched ribbon manufacturing apparatus. Now, the molten steel injected from the tundish 9 into the cooling roll 5 is cooled and solidified into a ribbon 3, which is then wound up by a winding roll 6 via a deflation crawler 8 and a pinch roll 4.

Here, the tension between the cooling roll 5 and the pinch roll 4 is controlled to be low by the pinch roll 4, while the inclination of the steering roll 1 with respect to the conveyance line is adjusted between the pinch roll 4 and the take-up roll 6. The structure allows the tension to be controlled to any desired value.

That is, a detector 2 for detecting meandering is provided on the exit side of the pinch roll 4, and a meandering control gain calculator 7 gives a command to the hydraulic cylinder 10 to move the steering roll l in accordance with the detected amount of meandering.

Furthermore, the details of the meandering control device are shown in FIG.

The positions of both ends of the thin strip 3 on the exit side of the pinch roll 4 are detected on the input side of the steering roll 1 by a detector 2 using, for example, a camera. Then, the meandering amount calculation unit 11 calculates the signal difference between the detectors 2, that is, the meandering amount of the ribbon 3, and calculates the meandering amount and the predetermined meandering amount from the setting device 13. A comparison calculation unit 14 performs a comparison calculation with the allowable meandering amount. The result of the comparison calculation is input to the meandering gain calculator 7 as a meandering deviation output, and an appropriate gain is applied thereto to produce a meandering correction signal.

On the other hand, the signal sum from the detector 2, the signal (tension) from the tension measuring device 18 such as a load cell, and the upper CPU (
Information signals such as plate thickness and steel type from the process computer (process computer) 16 are input to the meandering gain calculator 7, and as a result, a meandering correction signal corresponding to each experimental condition is obtained and input to the control means. That is, the signal is input to the servo valve 17, and the servo valve 17 controls the amount of pressure oil flowing into and out of the hydraulic cylinder 10, thereby adjusting the amount of movement of the steering roll 1.

FIG. 2 shows an example of a drive means for the steering roll 1.

Chocks 19 that support both ends of the steering roll 1
is installed on the frame 21 via the measuring device 18. A signal sent from the servo valve 17 causes the hydraulic cylinder 0 to reciprocate, and this movement is transmitted around the pivot 22 via the guide 20, causing the steering roll 1 to move relative to the frame 21.

The steering roll 1 is moved so that the angle of intersection between its axis and the ribbon changes, that is, the steering roll 1 is adjusted so that the ribbon and the axis are always perpendicular to each other depending on the meandering ribbon. The specific movement of the steering roll 1 is shown in FIG.
moves in the direction of arrow P and conversely meanders toward the DS side, the steering roll 1 moves in the direction opposite to arrow P.

Furthermore, from the viewpoint of preventing meandering, it is also effective to form an appropriate round on the steering roll l.

For example, a roll with a diameter of 300 mm and a width of 700 mm is provided with a radial crown having a radius of 3 mm.

Furthermore, as a meandering detector, there is a means that uses the injection pressure of inert gas to detect the pressure received at the nozzle and detects the position of the ribbon to detect the amount of meandering, and an eddy current displacement sensor is used to detect the edge of the ribbon ( Although there are means for detecting the displacement of a conductor (displacement of a conductor), the optical detection device shown in FIG. do. In this method, a light emitter and a light receiver are provided at each end of the ribbon, sandwiching the ribbon, and the amount of meandering is detected based on the difference in the amount of light at both ends.

In addition, in the quenching ribbon process, red heat (70
0° C. or higher) and poor shape (for example, sawtooth shape), disturbances to the edge detection of the ribbon may occur.

To deal with this, it is possible to remove disturbances by using an infrared tat filter (separating the infrared region) on the optical detection sensor (image sensor - camera), or by adjusting the scanning cycle and camera aperture to average the signal. I can do it.

(Effects of the Invention) According to the present invention, even when continuously winding a ribbon that is passed at high temperatures and high speeds, meandering of the ribbon that is passed through a low-tension conveyance system can be prevented. Since the meandering control gain can be changed based on early detection and operating conditions, stable meandering control can always be performed.

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are explanatory diagrams showing a meandering control device according to the present invention, FIGS. 2(a) and (b) are top and front views showing a steering roll drive means, and FIG. FIG. 6 is an explanatory diagram showing the tilting of the steering roll according to the meandering of the ribbon. 1... Steering roll 2... Detector 3... Thin strip 4... Pinch roll 5... Cooling roll 6... Take-up reel 7... Meandering control gain calculator 8... Deflation crawl 9...Tandish 10...Hydraulic cylinder 11...Meandering amount calculator 12...Plate width calculator 13...Setter 14...Comparator
15...Tension calculator 16...CPLI (7'
process computer) 17...Servo valve 18...Measuring instrument 20...Guide 22...Pivot 19...Chock 21...Base Fig. 2 (a)

Claims (1)

[Claims] 1. Between a pinch roll that sends a rapidly solidified metal ribbon produced by rapidly cooling and solidifying molten metal on the surface of a cooling roll to a take-up reel, and a take-up reel that winds this ribbon, A steering roll arranged to cross the conveyance line, a driving means that gives the steering roll a movement that changes the angle of intersection between the axis of the steering roll and the conveyance line, and detecting the positions of both ends of the ribbon on the input side of the steering roll. A meandering amount calculator that calculates the meandering amount by calculating the difference between the output signals from the detectors and a meandering amount calculator that calculates the meandering amount by calculating the difference in the output signals from the detectors, and a meandering amount calculator that calculates the meandering amount by calculating the difference in the output signals from the detectors. Meandering control that calculates the meandering control gain based on the calculated width of the ribbon, the tension added to the ribbon calculated from the output signal of the measuring device, and the meandering amount calculated by the meandering amount calculator. A meandering control device for a rapidly cooled metal ribbon, comprising a gain calculator and a control means for controlling the displacement of a steering roll by a drive means based on the output from the meandering control gain calculator.