JPS5823547A - Controlling method for broadside thickness of thin strip produced by single roll method by quick cooling method for molten metal - Google Patents

Abstract

PURPOSE:To produce a large amt. of thin strip which is uniform in a width direction easily and stably, by inclining the clearance between a roll and a nozzle vertically so as to minimize the deviation in the broadside thickness from the thickness distribution obtained by measurement of the thickness at >=2 points in the width direction. CONSTITUTION:The molten metal ejected from a nozzle 7 is cooled quickly on a rotary cooling roll 8 to solidify to a thin strip 9, which is taken up on a reel 13. Bearing boxes 14 support the roll 8 with the bearings therein, and are movable upward and downward independently on the right and left by means of cylinders 15 connected thereto. According to the deviations in the right and left thickness, the bearing boxes are movable respectively by DELTAS1, DELTAS2. Thickness gages consist of 12A, 12B which measure two points in the width direction of the plate; The values measured therewith are transmitted to an arithmetic controller 16, which operates the roll positions where the prescribed thickness is obtained and the deviation in the broadside thickness is minimized. Said positions are transmitted to oil hydraulic controllers 17A, 17B for positions. The controllers 17A, 17B drive servocontrol valves to introduce oil pressure to the cylinders 15, whereby the precise control of the positions is executed. Detectors 18 for cylinder positions feed back the position signals to the controllers.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the thickness in the width direction of a thin strip plate produced by a molten metal quenching method using a sheet zero-roll method.

In general, the method for producing a rapidly solidified metal thin strip plate using the molten metal quenching method is to use a cooling rod for quenching that rotates at high speed (usually metal 0-
It is known as a method in which molten metal is continuously supplied to the surface of a crucible by extruding it by gas pressure or the like for seconds from a crucible or the like, and is solidified by ultra-rapid cooling.

Both the one-roll method using only one cooling roller and the double-roll method using two cooling rollers are known, but the present invention relates to the one-roll method. be.

In order to manufacture high-quality thin strips with uniform thickness using the conventional single-layer method, (1) the nozzle ejection pressure must be controlled at a constant level;

(2) Control the roll rotation speed to be constant.

(3) Control the gap between the O-le and the nozzle to be constant.

This method was used.

However, these methods are effective when the strip width is extremely narrow as in the past, but as the strip width increases to 100 m or more, deviations in the strip width direction become an important problem in addition to fluctuations in the longitudinal direction of the strip. I came. This is the nozzle and rotation 0-
Even if there is a relative inclination with the base plate, when the width of the plate is narrow, the change in the amount of instep is negligible, but as the width of the plate increases, these effects become extremely large. . In addition, the conventional production amount per batch was only a few noodles at most, and the time required was more than 10 seconds, so deformation of the O-ru and nozzle was slight. However, as the production volume per batch increases and the charging time becomes longer, zero-ru deformation and nozzle deformation cause changes in the thickness of the thin strip in the longitudinal direction, and the distribution of thickness in the width direction becomes a problem. It's here.

In particular, thin strip plates used as power trusses must have thickness deviations in the width direction as small as possible so that they can be stacked to a required thickness. 6. The present invention solves the above-mentioned problems and provides a thickness control method for easily and stably manufacturing thin strip plates in large quantities that are uniform in the width direction.

The present invention measures the plate thickness at at least two points in the width direction, and uses the obtained plate thickness distribution to minimize the thickness deviation in the width direction. This is a widthwise thickness control method that calculates the amount of relative movement between the wheels and constantly controls them at that position to obtain a thin strip plate with extremely small deviations in widthwise thickness.

That is, in the present invention, when producing a thin strip plate by spouting molten metal from a nozzle onto a rotationally cooled O-L, the thickness distribution in the width direction is measured at at least two points, and the thickness distribution in the width direction is calculated from the obtained thickness distribution in the width direction. O-L that minimizes the plate thickness deviation and 0 in the nozzle width direction
- Calculate the relative movement amount between the nozzle and the nozzle gap and based on the calculation result! Width of a thin strip plate manufactured by a single-roll method using a molten metal quenching method characterized by controlling the thickness deviation in the width direction to a minimum by relatively tilting the distance between the roll and the nozzle in the vertical direction. This is a directional plate thickness control method.

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

Fig. 1 is an explanatory diagram showing the general configuration of an apparatus for producing thin strips by the molten metal quenching method using the strip 0-ru method. and is dissolved by suitable means such as a high frequency coil (not shown).

The molten metal 2 is guided through the conduit 4 to the intermediate storage tank 5 by operating the stopper 3, and is continuously jetted onto the cooling tube 8 from the paper nozzle 7 by gas pressure 6 introduced from the outside. The molten metal spouted onto the cooling O-L 8 is rapidly solidified on the O-L and becomes a thin ribbon plate 9. The thin strip plate 9 is peeled off from the cooling roller 8 by a peeling means such as injecting gas from a gas jet pipe 10 as necessary, and then advances along a guide plate 11, passes through a plate thickness measuring device 12, and is wound up. 13.

FIGS. 2 and 3 show an embodiment of the present invention.

Although not shown in the figure, the inside of the cooling tube 8 is cooled by passing water through a rotary joint, and is supported by a bearing and rotated at high speed by a belt or the like.

Reference numeral 14 denotes a bearing box, and the bearings in this box support the rotating wheel 8, and the bearing box itself is connected to a hydraulic cylinder 15, and can be moved up and down independently on the left and right sides. The structure is such that it can move ΔS and ΔS according to the deviation.

The plate thickness gauge 12 is composed of two detectors 12 and 12B, and measures two points in the moving plate width direction.

This measured value is transmitted to the arithmetic controller 16, and the arithmetic controller 1
6 calculates the O-1 position at which the plate thickness is a predetermined thickness and the thickness deviation in the width direction is minimum based on this measurement signal, and the position is transmitted to the hydraulic position control devices 17M and 17B. Hydraulic position control device 17
When the hydraulic servo valve is driven, the hydraulic servo valve 17B receives hydraulic pressure from another hydraulic source (not shown) from the hydraulic cylinder 52-15.
By introducing K, more precise position control is performed. 1
8 is a syringe position detector, and a position signal from this is fed back to the hydraulic control devices 17 and 17B.

As described above, according to the method of the present invention, an excellent thin strip plate with extremely small thickness deviation in the width direction can be obtained, and its industrial value is extremely high.

Next, the present invention will be explained in detail with reference to FIG.

As shown in FIG. 4, the gap between the nozzle and O-L is 1. is set to . Now assuming that the plate thickness has decreased by Δ,
In order to correct this, it is necessary to widen the gap between the nozzle and O-L by Δd.

On the other hand, since the change in Δt1Δd is extremely small, it can be considered to be proportional to Δd and ΔtFi. That is, Δd・to Δt−
(1) (k is a proportionality constant) When the cover is set up according to the relationship shown in FIG. 4, it is assumed that the initial gap between the nozzle and the O-le is to.

If the 0-ru is moved by Δ81 and ΔS by a syringe (not shown) at the time of thickness, the gaps at the plate thickness gauge at this time are to+Δdl, to+Δd, respectively.
becomes. At this time, according to the geometrical relationship, on the one hand, this brings about Δdl and Δt! to the change in plate thickness Δtl''-, respectively. Therefore, conversely, deviations Δtl and Δ1. from the set value to of the plate thickness are detected. In this case, calculate the gap amounts Δd1 and Δd3 between the nozzle and the roll to be corrected according to formula (1), and then calculate the syringe movement amount Δ8 from formulas (2) and (3).
1. By calculating ΔS3 and correcting the plate thickness from this K, it is possible to maintain the set value.

In addition, although the case where there are two plate thickness detectors is shown as an example, it is possible to measure multiple points simultaneously, or use a method of scanning in the width direction with one detector. In this case, the calculation method is a method such as the ordinary method of least squares so as to minimize the deviation of several points.

Furthermore, although a method in which the rolls are tilted has been shown in the embodiment, the same effect can be obtained by using a method in which the nozzle can be tilted up and down.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the general configuration of an apparatus for manufacturing a thin strip plate by a single O-ru method using a molten metal quenching method, FIGS. 2 and 3 are explanatory diagrams showing embodiments of the present invention, and FIG. The figure is a detailed explanatory diagram of the present invention. 1... Melting r 2... Molten metal 3... Stopper 4... Conduit 5... Intermediate storage tank
6...Cass pressure 7...Nozzle 8...Cooling o-le 9...° thin strip plate lO...Gas injection pipe 11...Guide plate 12...Plate thickness measuring device 1
3... Take-up reel 14... Bearing box 15...
Hydraulic Siriku J-16... Arithmetic controller 17... Hydraulic position control device 18... Syringe position detector.

Claims (1)

[Claims] When producing a thin strip by spouting molten metal from a nozzle onto a rotating cooling roll, measure the thickness distribution in the width direction at at least two points, and minimize the deviation of the thickness in the width direction from the obtained thickness distribution in the width direction. Calculate the relative movement amount between the 0-le and the nozzle in the width direction of the 0-le and the nozzle, and based on the calculation result, 0-
The width direction of a strip of plate manufactured by the 0-hole method using the molten metal rapid cooling method, which is characterized by controlling the plate thickness deviation in the width direction to a minimum by tilting the gap between the nozzle and the nozzle relatively in the electrodynamic direction. Plate thickness control method.