JPH0338939B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention uses a twin-roll continuous casting machine in which a cylinder is attached to a moving roll to prevent melt leakage at the start of casting and to eliminate cracks. The present invention relates to a method for directly manufacturing a thin metal sheet strip, which directly and continuously casts a thin metal sheet strip with good surface properties and thickness distribution, and an apparatus for manufacturing the same.

(Prior art) When using a twin-roll continuous casting machine to directly continuously cast metal sheet strips from molten metal, it is important to control the rolling force when the solidified shell is rolled or rolled by the rolls. It is.

Regarding this, for example, Japanese Patent Application Laid-Open No. 59-215256 discloses that a plurality of rolls are arranged in parallel, and a space is formed by a barrel seal arranged on the rolls and a side seal arranged on the side surface of the rolls. In a twin-roll continuous machine that supplies molten steel to a sump and continuously pulls out a metal strip (solidified shell) downward from a roll gap, the rolling force when the solidified shell is rolled by the rolls. If the rolling force is larger than a predetermined rolling force, the barrel seal is moved to the roll gap side to shorten the cooling length of the molten steel by the rolls, and if the rolling force is smaller than the predetermined rolling force, the barrel seal is moved to the roll gap side. A method is proposed in which the length of cooling of molten steel by the rolls is extended by moving the rolls away from the sides, thereby continuously casting metal strips.

Furthermore, Japanese Patent Application Laid-Open No. 59-193740 discloses a pair of cooling rolls that are parallel to each other, close to each other, and rotate in opposite directions; The molten metal supplied into the sump is brought into contact with the outer circumferential surface of the rotating cooling roll to cool and solidify it, thus cooling the rotating cooling roll. A continuous casting method for a metal plate in which a pair of solidified shells obtained on the outer peripheral surface of a roll are pressed against each other by the rotating cooling roll and taken out as a single cast plate from the roll gap, the cooling. When the gap between the rolls is less than a predetermined size, the pressing pressure of the cooling rolls against each other is controlled to be constant, and when the gap exceeds a predetermined size, the pressure is controlled to be constant so that the gap is constant. Gap control is performed, and when the pressing pressure of the cooling roll exceeds a set value during the constant gap control, the pressing pressure of the cooling roll is controlled to a constant value until the gap becomes less than a predetermined dimension. A method for providing pressure control and thus stable metal sheet casting is disclosed.

(Problems to be Solved by the Invention) The continuous casting method in a twin-roll continuous casting machine described in JP-A-59-215256 measures the rolling force with which the solidified layer is pressed by the rolls, and If the rolling force is smaller than the predetermined rolling force without changing the rolling force, the barrel seal forming the molten steel pool between the two rolls is moved away from the roll gap side by the fluid pressure cylinder, and the rolling force is lowered by the rolls. This method prevents cracks from forming on the metal strip by extending the cooling length of the molten steel and thickening the solidification shell to control the rolling force to a predetermined value, but it has the following drawbacks. .

In other words, when the rolling force is larger than the predetermined rolling force, moving the barrel seal toward the roll gap side in order to shorten the cooling length of the solidified layer that has started solidifying on the twin rolls will force the movement of the already formed solidified layer. However, as a result, hot water wrinkles and the like may occur, deteriorating the surface quality.

In addition, the continuous casting method for metal sheets described in Japanese Patent Application Laid-Open No. 59-193740 is a method in which the pressing force between twin rolls and the roll gap are controlled to be constant using a hydraulic cylinder, but it has the following drawbacks. .

That is, even if an abnormal pressure is detected at a certain point in time during control by the hydraulic cylinder, the control action performed in response to the abnormal pressure is slow and there is a time lag, resulting in inadequate control. In addition, the method includes
One of the most important factors in this type of casting method is the unresolved problem that there is no description of the shape of the metal sheet produced and the predetermined range of the pressing force between the twin rolls that will improve the cooling effect. It was left behind.

Another problem with the above-mentioned twin-roll type continuous thin plate casting machine was the problem of leakage at the beginning of casting of the metal thin plate strip.

For example, JP-A-58-176063 and JP-A-60-
Publication No. 3951 and other publications examine this problem, but in both cases, a starter plug or dummy bar is inserted between the twin rolls, and molten metal is injected between the twin rolls to store the molten metal. This method is characterized by allowing the slab to pool, allowing the solidified layer to grow to a certain extent, and then rotating pinch rolls to pull out the slab, which has the following problems.

That is, first of all, the method disclosed in JP-A-58-176063 is a method in which timing is difficult to start pouring the molten metal between the twin rolls and then rotate the pinch rolls to start casting. That is, if the timing is too early, the solidified layer will be thin and will be broken and breakout will occur. Furthermore, if the timing is delayed, the solidified layer will become thicker, generating a large rolling force on the twin rolls, damaging the surface of the twin rolls, and in severe cases, the coagulation layer will not be caught between the twin rolls, making it impossible to cast.

In addition, in the method disclosed in the above-mentioned Japanese Patent Application Laid-open No. 60-3951, when the molten metal flows between the twin rolls before starting casting, the twin rolls are rotated, the dummy bar is stopped, and a solidified layer is formed on the dummy bar. However, there was a problem in that it was difficult to properly grow the solidified layer in contact with the rotating cooling roll.

(Means for Solving the Problems) An object of the present invention is to provide a method and an apparatus that can eliminate and improve the problems and drawbacks of the prior art as described above. That is, in the present invention, distilled molten metal is cooled on the circumferential surface of each of the rolls on the rotation input side of a water-cooled twin roll consisting of a fixed roll and a moving roll that rotate in opposite directions and whose rotational axes are parallel to each other. In the method of directly manufacturing a thin metal strip by producing a solidified shell and discharging this solidified shell from the rotating twin roll output side, the moving roll is pressed in a direction that pressurizes the solidified shell generated between the rolls. A cylinder is provided to move toward the moving roll shaft, and the pressing force of the cylinder applied to the moving roll shaft is measured by a load measuring device, and this pressing force is controlled within a predetermined range. a compression force of a compression spring interposed between the moving rolls is provided, and a cylinder is provided for moving the moving rolls in a direction to pressurize the solidified shell generated between the rolls; The pressing force applied to the cylinder is measured by a load measuring device, and this pressing force is controlled within a predetermined range. By interposing compression springs between the two, and making the compression force of the compression springs cooperate with the cylinder pressing force, it is possible to instantaneously respond to rapid fluctuations in the roll pressing force, and at the same time maintain an appropriate roll gap. Each of these is a direct manufacturing method for thin metal sheet strips, with the following characteristics:

As an apparatus used to carry out these methods, the present invention cools molten metal in a molten metal reservoir formed between a pair of rolls on the circumferential surface of the rolls to generate a shell, and converts the solidified shell into a shell. In this type of direct manufacturing equipment for metal thin plate strips, the metal sheet strip is rolled and discharged from the twin roll rotating output side. Automatic control means that includes a cylinder attached to the roll shaft to move the moving roll shaft toward the fixed roll, and that measures and controls the pressing force when the cylinder presses the moving roll shaft against the fixed roll. , and a compression spring is interposed between the cylinder and the moving roll shaft. A water-cooled twin roll consisting of a fixed roll and a movable roll is provided, and a cylinder is provided which is attached to the movable roll shaft and moves the movable roll shaft in the direction of the fixed roll, and the cylinder moves the movable roll shaft. Automatic control means for measuring and controlling the pressing force when pressing against the fixed roll is provided, and between the cylinder and the moving roll shaft, and between the roll shaft of the fixed roll and its roll shaft locking device. We propose an apparatus for directly manufacturing thin metal sheet strips, each of which is characterized by the interposition of a compression spring.

(Function) The present invention provides a direct manufacturing device having water-cooled twin rolls consisting of a fixed roll and a moving roll that rotate in opposite directions, in which molten metal is supplied between the rolls, and the molten metal is transferred to each roll. Twin-roll continuous casting that continuously and directly casts thin metal strips by cooling and solidifying on the peripheral surface, and then discharging the solidified shell produced on the roll surface while being compressed from the roll rotation exit side. In the machine, when the solidified shell is rolled down by the twin rolls, the cylinder pressing force pressing the moving roll shaft of the twin rolls is measured by a load measuring device, and if the cylinder pressing force is larger than a predetermined value, The pressing force is controlled to be small, and if this pressing force is smaller than a predetermined value, the cylinder pressing force is controlled to be large and the pressing force is automatically controlled to be within a predetermined range. A feature is that a compression spring (hereinafter referred to as a spring) is interposed between the two, and the elasticity of this spring is used to control the cylinder pressing force in a cushioning manner.

When controlling the cylinder pressing force, if there is a time delay due to an operation delay, for example, the supply of molten metal suddenly increases for some reason, the molten metal pool increases, and the molten metal doubles. When the length of cooling by the rolls becomes longer and the solidified layer becomes thicker, or in abnormal situations such as when a solidified shell adhering to the inner wall of the molten metal pool during casting falls into the molten metal, the pressing force may be increased. In such a case, if the control to lower the pressing force is delayed, cracks will occur in the thin metal strip, and if severe enough, the rotation of the twin rolls will stop, resulting in casting being halted. Such sudden changes can be instantaneously responded to by the action of the compressive force of the spring. Therefore, according to the method of the present invention, the thin metal sheet strip is pulled out without stopping the casting due to the stoppage of the rotation of the twin rolls, and has a good surface quality that does not cause cracks, etc., and a good thickness distribution. can be manufactured.

Further, in the present invention, the roll reduction control using such a compression spring acts suitably on the following control of the start of casting. In other words, after setting the initial roll gap between the rolls by moving the stopper for setting the initial roll gap, a metal thin plate strip of a predetermined thickness is pressed with a predetermined pressing force to produce the metal sheet, so a test of the predetermined plate thickness is performed in advance. A thin plate is placed between the twin rolls, and is moved to a predetermined initial roll pressing force while measuring the roll pressing force using a load measuring device installed between the cylinder and the spring. The cylinder can be electric, hydraulic, or
Any pneumatic type may be used, and the spring may be a flat spring, a coil spring, or a leaf spring.

Next, when the twin rolls are rotated and the thin test plate is discharged, by selecting a spring with a small spring constant compared to the initial roll pressing force that has a compressive force that reduces leakage, the roll gap is created by the compressive force of the spring. The spring force is restored to a roll gap that does not cause hot water leaks. In this state, by keeping the height of the molten metal reservoir defined on the rotation input side of the twin rolls constant at a predetermined roll rotation speed, the injection amount is controlled so that the plate thickness is constant. At the same time, the molten metal is injected into the twin rolls, cooled and solidified by the twin rolls, and the solidified layer formed on the rotating surface of the twin rolls is rolled down to start continuous casting of the metal sheet strip. Casting can be started smoothly without leakage, breakout, or inability to roll between the twin rolls due to excessive growth of the solidified layer.

The roll pressing force applying mechanism can also be installed on both shafts of the twin rolls. That is, in addition to the moving roll, a spring can be interposed between the other roll shaft and the roll shaft locking device to provide a pressure mechanism, so that compressive force can be applied to each of the twin rolls. This compressive force narrows the roll gap as described above, making it possible to obtain a roll gap that does not cause hot water leaks.
Casting can be started smoothly.

Further, by providing the roll pressing force applying mechanism on both sides of the roll axis, there is an advantage that it becomes easy to adjust the setting of the initial roll gap and to adjust the balance between the left and right sides (both sides of the roll).

In addition, when a high roll pressing force is required, especially during unsteady operation at the start of casting, that is, during the injection control period until the molten metal pool on the twin roll surface is stably controlled by injection, the roll pressing force should be increased. If damage to the roll or a drop in roll rotation speed occurs due to excessive torque, measure the torque (or roll drive motor load current or roll rotation speed), and if the measured value exceeds a certain standard, remove the cylinder between the two rolls. By moving the cylinder in the opposite direction, temporarily loosening the roll pressing force, and returning the cylinder to its original position as the torque (or roll drive motor load current or roll rotation speed may also be used) returns to within the reference range, the cylinder can be smoothly returned to its original position. Steady operation becomes possible by starting casting.

(Example) FIG. 1 and FIG. 5 are a longitudinal cross-sectional view and a plan view, respectively, of an apparatus showing one embodiment of the present invention, and the numbers shown in each of the roll axes of the fixed roll 1 and the moving roll 1' are 10' rotates but is fixed, and the illustrated roll shaft 10 is movable and connected to the cylinder 3 via a compression spring 2. Further, a load measuring device 6 such as a load cell for measuring roll pressing force is installed between the compression spring 2 and the cylinder 3. 7 is a stopper for setting the initial roll gap;
8 is a roll shaft locking tool, and 9 is a side dam.

FIG. 2 is a longitudinal cross-sectional view of an apparatus showing another embodiment of the present invention, and the difference from the apparatus shown in FIG. , 11' are arranged on a horizontal plane, whereas in the one shown in FIG. 2, the relative positions and heights of the axes 11, 11' of the twin rolls 1, 1' are different.

FIG. 3 is a longitudinal cross-sectional view of a device showing still another embodiment of the present invention, and the difference from the device in FIG. On the other hand, in the case of FIG. 3, among the twin rolls 1 and 1', the roll diameter of roll 1 is smaller than that of roll 1'.

The above-mentioned roll pressing force applying mechanism can also be installed on both roll shafts 10, 10' of the twin rolls 1, 1', and by providing it on both sides of the roll shaft, it is possible to adjust the initial roll gap setting and adjust the left and right ( This makes it easier to adjust the balance of both sides of the roll.
Furthermore, if a camber (bend) appears in the thin metal strip 5 discharged during casting, the camber can be suppressed by adjusting the cylinder 3 in the two roll pressing force adjustment mechanisms.

FIG. 4 is a longitudinal sectional view of a device showing still another embodiment of the present invention in which a pressure mechanism is installed on both roll shafts 10, 10' of twin rolls 1, 1'. The roll shaft 10 of the roll 1 is movable and connected to the cylinder 3 via the compression spring 2, and the roll 1' is connected between the roll shaft 10' and the roll shaft locking device 8 of the roll 1'. A compression spring 2' is also interposed.

In addition, there is a strong susceptibility to cracking due to excessive roll pressing force, and a high susceptibility to hot cracking due to an increase in the discharge temperature of the thin metal strip due to insufficient roll pressing force. The surface temperature of the thin plate strip can be measured and the cylinder 3 can be moved and controlled according to the measured value.

The cylinder may be electric, hydraulic, or pneumatic, and the compression spring may be a flat spring,
Either a coil spring or a plate spring may be used.

Next, a method for directly manufacturing a thin metal strip using the apparatus of the present invention will be explained based on the drawings.

By moving the initial roll gap setting stopper 7, the initial gap between the rolls is set. After setting the initial roll gap, the cylinder position is moved to a predetermined initial pressing force while measuring the roll pressing force using the load measuring device 6.

Next, the molten metal is injected between the twin rolls 1 and 1' while the rotation of the rolls is stopped or kept rotating at a predetermined number of revolutions or less, and the thin metal strip 5 is continuously cast. Start. At this time, it is necessary to perform the work while controlling the amount of injection so that the height of the molten metal reservoir 4 is constant at a predetermined roll rotation speed. By doing this, the solidification period of the molten metal, that is, the solidification time is determined, and therefore the thickness of the thin metal strip 5 is also determined.

In this way, the initial roll pressing force at the initial roll gap is determined, and when casting starts, the roll gap is pushed open by compressing the solidified shell, and the compression spring is further compressed by the distance equal to the difference in the initial roll gap. The pressing force is the initial roll pressing force and the further compressed compression force added to the roll pressing force. Here, by making the spring constant of the compression spring 2 smaller than the initial roll pressing force, changes in the pressing force due to variations in plate thickness will be reduced, and in the unlikely event that a problem occurs in pouring, the thickness of the thin metal strip 5 will be reduced. When a sudden change is likely to occur, the compression spring 2 absorbs the change in the roll holding force due to the sudden change in the roll pressing force, thereby preventing the occurrence of cracks on the surface of the thin metal strip. Furthermore, it is possible to avoid stopping the casting work and accidents due to insufficient biting of the twin rolls 1 and 1'.

The cylinder 3 that controls the pressing force (not shown) pressing the roll shaft side of the roll 1 by the cylinder 3 can automatically move the roll shaft 10 of the roll 1. By automatically adjusting the roll gap by the compression force of the compression spring 2, the twin rolls 1, 1'
Cracks on the surface of the thin metal strip 5 can be prevented without stopping casting due to stopping of rotation.

However, in the following case, the cylinder 3 may be required to act together with the spring 2 to continuously control the roll pressing force. That is, (1) with long-term operation, the roll surface temperature, the injected molten metal temperature, and the roll cooling water temperature change, which changes the solidification conditions, increases the roll discharge temperature of the thin metal strip 5, and causes hot cracking. If this occurs, the surface temperature of the thin metal strip 5 is measured, and the cylinder 3 is used to increase the roll pressing force according to the measured temperature, thereby lowering the thin metal strip discharge temperature.
High temperature cracking can be eliminated. (2) When high roll pressing force is required, especially during unsteady operation at the beginning of casting, that is, when the twin rolls 1, 1'
During the injection control period until the molten metal pool 4 is stably controlled, if damage to the roll or a decrease in the roll rotation speed occurs due to excessive roll pressing force, the roll drive torque (or roll drive motor load current, If the measured value exceeds a certain standard, the cylinder is moved in the opposite direction to the direction between the twin rolls 1 and 1', the roll pressing force is temporarily relaxed, and the torque (or Steady operation becomes possible by returning the cylinder to its original position when the roll drive motor load current (or roll rotation may be used) returns to within the reference range.

The casting start operation without leakage or breakout is carried out as follows. That is, first,
By moving the initial roll gap setting stopper 7, the initial gap between the rolls is set. After setting the initial roll gap, in order to manufacture the thin metal strip 5 of a predetermined thickness by pressing it with a predetermined pressing force, a test thin plate of a predetermined thickness is inserted between the twin rolls 1 and 1' in advance. cylinder 3 and spring 2
The position of the cylinder 3 is moved to a predetermined initial roll pressing force while measuring the roll pressing force with a load measuring device 6 interposed between the cylinder 3 and the roll pressing force. Then, when the twin rolls 1 and 1' are rotated to discharge the test thin plate, the compressive force of the spring 2 restores the roll gap to a level at which no leakage occurs. In this state, the height of the molten metal reservoir 4 defined on the rotation input side of the twin rolls 1 and 1' is kept constant at a predetermined rotation speed so that the plate thickness is constant. While controlling the amount of metal injection, double rolls 1, 1'
The molten metal is injected, cooled and solidified by the twin rolls 1 and 1', and the solidified layer formed on the rotating surface of the twin rolls is rolled down to start continuous casting of the metal sheet strip. Casting can be started smoothly without leakage, breakout, or inability to press between the twin rolls 1 and 1' due to excessive growth of the solidified layer.

Next, an example of operation of the method of the present invention will be explained.

(1) The roll diameter of the twin rolls is
A roll with a diameter of 400 mm and a roll width of 300 mm is used, an electric cylinder is used to control the roll pressing force, and a spring constant of 0.15 t/mm is used as a compression spring.
Placing the counter springs in parallel to the roll axis,
By measuring the roll pressing force using two load cells, the discharge temperature using a thermo camera, and the motor load current, the electric cylinder is automatically controlled, and the cast steel SUS304 is rolled at an initial roll gap of 0.6 mm, a roll peripheral speed of 1 m/sec, and a roll speed of 1 m/sec. Direct casting experiments were conducted under the conditions of a pressing force in the range of 0.5 to 5.5 t.

As a result, when the roll pressing force was smaller than 0.5t, hot cracking occurred at the sheet strip discharge temperature of 1200 to 1250℃, and when the roll pressing force was larger than 5t, cracks occurred due to excessive pressing force, but under the condition of 3t, the thin plate There were almost no cracks at the band discharge temperature of 1050°C.

Figures 6 and 7 show the results of measuring the thickness of the thin plate strip in the width direction (300 mm) in this operation example, and Figure 6 shows the roll pressing force.
3t, and Figure 7 shows the results under the 1.0t condition.

As is clear from the results shown in FIGS. 6 and 7, the plate thickness distribution is good under the condition of a roll pressing force of 3 t, but it is found that the plate thickness distribution is poor under the condition of 1 t.

Roll pressing force when roll width is 300mm
Converting 0.5 to 5t into roll pressing force per unit roll width is 1.67 to 16.7Kg/mm.

FIG. 8 shows the relationship between the roll pressing force (Kg/mm), the overall heat transfer coefficient (cal/cm ² ·sec·degree), the thin plate strip discharge temperature, cracks, and plate thickness distribution. From this Figure 8, the roll pressing force per unit roll width is 1.67~16.7Kg/mm (roll pressing force is 0.5~16.7Kg/mm).
5t), no cracking occurred, and the roll pressing force per unit roll was 10Kg/mm (roll pressing force
It can be seen that the plate thickness distribution is good when the thickness is 3t) or more.

Furthermore, using a device as shown in FIG.
An operation was carried out using a device in which both rolls 1 and 1' were interposed. As a result, as a condition for the roll pressing force, the spring constant of the counter springs inserted at four locations was changed from 0.15 t/mm when the spring was used only for roll 1 to 0.30 t/mm. Similar good results were obtained.

(2) Using the device shown in Figure 1, using twin rolls with a roll diameter of 400 mmφ and a roll width of 300 mm, the initial gap between the rolls is set to 0.6 mm by moving the initial roll gap setting stopper, and the roll pressing force is applied. As a mechanism, an electric cylinder and a counter spring with a spring constant of 0.15t/mm are arranged in parallel to the roll axis, and two load cells measure the roll pressing force, a thermo camera measures the thin plate discharge temperature, and the motor load current. Automatically control the electric cylinder to cast steel types
SUS304 was tested under the conditions of an initial roll gap of 0.6 mm, a roll circumferential speed of 1 m/sec, and a roll pressing force of 3 t, but there were no incidents of melt leakage at the start of casting or casting stoppage.

(3) The device shown in Figure 1 uses twin rolls with a roll diameter of 400 mmφ and a roll width of 300 mm, and an electric cylinder and a spring constant as the roll pressing force pressurizing mechanism.
A 0.15t/mm counter spring is placed in parallel to the roll axis, and the electric cylinder is automatically controlled by measuring the roll pressing force with two load cells, the thin plate ejection strength with a thermo camera, and the motor load current. Casting was conducted using 42% Ni steel, which has better fluidity in molten steel than SUS304, under the conditions of an initial roll gap of 0.3 mm, a roll circumferential speed of 0.6 m/sec, and a roll pressing force of 3 t, but the casting stopped due to a leak at the start of casting. did not occur at all.

(Effects of the Invention) As explained above, according to the present invention, the pressing force of the twin rolls can be set within a predetermined range without impact using a cylinder and a compression spring, which causes casting stoppage due to roll rotation stoppage. In addition to being able to produce stable thin metal strips with a crack-free surface quality and good thickness distribution, the process also enables smooth operation at the start of casting without causing melt leakage or breakouts. Can be done.

[Brief explanation of the drawing]

1, 2, 3, and 4 are longitudinal sectional views of an apparatus showing embodiments of the present invention, FIG. 5 is a plan view of the apparatus shown in FIG. 1, and FIGS. 6 and 7. The diagram is
Figure 8 shows the relationship between roll pressing force, overall heat transfer coefficient, metal thin plate discharge temperature, cracking, and thickness distribution. be. 1...Moving roll, 1'...Fixed roll, 2,
2'... Spring for compression, 3... Cylinder, 4... Reservoir for molten metal, 5... Metal thin plate strip, 6... Load measuring device, 7... Stopper for setting initial roll gap, 8... Roll shaft. Locking tool, 9... Side weir, 10,
10'...Roll axis, 11,11'...Roll axis line.

Claims (1)

[Claims] 1. Distilled molten metal is applied to the rotation input side of a water-cooled twin roll consisting of a fixed roll and a moving roll, which rotate in opposite directions and whose rotation axes are parallel to each other, on the circumferential surface of each roll. In a method for directly producing a metal thin plate strip by cooling to produce a solidified shell and discharging this solidified shell from the rotating output side of twin rolls, the direction in which the solidified shell generated between the rolls is pressurized against the moving rolls. A cylinder is provided to be moved toward the moving roll shaft, and the pressing force of the cylinder on the moving roll shaft is measured by a load measuring device, and this pressing force is controlled within a predetermined range. By cooperating with the compressive force of a compression spring interposed between the roller and the roller, sudden changes in the roll pressing force can be instantaneously responded to, and an appropriate roll gap can be maintained. A method for directly manufacturing thin metal strips. 2. A method in which the molten metal in a molten metal reservoir formed between a pair of rolls is cooled on the circumferential surface of the rolls to generate a solidified shell, and the solidified shell is discharged under pressure from the rotating output side of the twin rolls. In this direct manufacturing equipment for metal thin plate strips, water-cooled twin rolls consisting of a fixed roll and a moving roll whose rotational axes are parallel and rotate in opposite directions are installed on the above-mentioned moving roll shaft, and the moving roll shaft is A cylinder for moving the moving roll shaft in the direction of the fixed roll is provided, automatic control means is provided for measuring and controlling the pressing force when the cylinder presses the moving roll shaft against the fixed roll, and the cylinder and the moving roll shaft An apparatus for directly manufacturing thin metal sheet strips, characterized in that a compression spring is interposed between the two. 3. Distilled molten metal is cooled on the circumferential surface of each roll to form a solidified shell on the rotation input side of a water-cooled twin roll consisting of a fixed roll and a moving roll whose rotational axes are parallel and rotate in opposite directions. In the method for directly producing a thin metal strip by pressurizing and discharging the solidified shell from the rotating output side of twin rolls, a cylinder is moved relative to the moving roll in a direction to press the solidified shell generated between the rolls. The pressing force of the cylinder on the moving roll shaft is measured by a load measuring device, and this pressing force is controlled within a predetermined range. By interposing compression springs between each roll shaft locking device and making the compression force of these compression springs cooperate with the cylinder pressing force, sudden fluctuations in the roll pressing force can be instantaneously handled. A method for directly manufacturing a thin metal sheet strip, characterized in that a suitable roll gap is maintained at the same time. 4 A type of metal in which the molten metal reservoir formed between a pair of rolls is cooled on the circumferential surface of the rolls to generate a shell, and the solidified shell is discharged from the twin roll rotation output side by pressure. In a direct manufacturing device for thin plate strips, water-cooled twin rolls consisting of a fixed roll and a moving roll whose rotation axes are parallel and rotate in opposite directions are installed on the above-mentioned moving roll shaft, and the moving roll shaft is connected to the fixed roll. a cylinder for moving the movable roll shaft in the direction; and automatic control means for measuring and controlling the pressing force when the cylinder presses the movable roll shaft against the fixed roll; and while,
and an apparatus for directly manufacturing a thin metal sheet strip, characterized in that a compression spring is interposed between the roll shaft of a fixed roll and its roll shaft locking device.