JPH01104449A - Belt type continuous casting method preventing belt deformation - Google Patents

Abstract

PURPOSE:To prevent deformation of a belt and to improve quality of a cast strip by giving the belt the specific tension and heating both edge parts of the belt in the specific temp. range. CONSTITUTION:The apparatus has one pair of the belts 4 and one pair of short side molds 5 shaping pouring basin part at gap between the belts 4, and the molten metal poured in the pouring basin part is cooled and solidified to produce the metal strip. In this case, at the time of casting the cast strip having <1200mm casting width, the tension having >=10kgf/mm<2> is given to the belt 4. Further, both edge parts are heated in the range of >=100 deg.C and <=250 deg.C. By this method, the belt deformation is prevented and the quality of the cast strip can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a casting method using a belt-type continuous casting machine, which allows the width of the manufactured metal ribbon to be freely changed.

[Conventional technology]

BACKGROUND OF THE INVENTION Recently, continuous casting methods have been attracting attention for directly producing metal ribbons having a thickness of several millimeters to several tens of millimeters close to the final shape from molten metal such as molten steel.

When this method is used, the conventional multi-step rolling process can be omitted, thereby simplifying the process and equipment. Furthermore, since the process of heating the material to the processing temperature between each process is essentially unnecessary, an energy saving effect can also be expected.

One such continuous casting method is the twin belt method.

FIG. 13 is a diagram schematically showing this twin-belt continuous casting machine. In this continuous casting machine, molten metal in a tundish 1 is fed into a casting space from a nozzle 2.

This casting space is formed by partitioning both sides of the opposing gap between a pair of belts 4 made of a heat-resistant material such as steel, which run over a pulley 3, with short-sided molds. The molten metal poured into the casting space is cooled and solidified by the cooling rain 6, and is carried out as a metal ribbon 7.

At this time, if there is a gap between the belt 4 and the short side mold,
Molten metal is inserted into the hole, causing burrs. Therefore, it is necessary to press the belt 4 against the short side mold.

Now, there are two types of short side molds:

The first is a short side mold that does not move in the direction of movement of the metal being cast, and the second is an endless connected short side mold that moves in synchronization with the movement of the metal being cast. These are collectively referred to as short-side molds, but when the above two types are to be distinguished, the former is referred to as a fixed short-side mold, and the latter is referred to as a synchronously moving short-side mold.

When changing the cast metal width using a fixed short-side mold, the short-side mold is moved in the width direction of the belt, that is, at right angles to the belt movement direction, to expand or reduce the cast metal width.

In addition, when changing the cast metal width using a synchronously moving short-side mold, there are two methods: moving the synchronously moving short-side mold together with the frame toward the belt width direction to expand or reduce the cast metal width; When the cooling blocks constituting the movable short-side mold are sequentially inserted between the belts in the belt movement direction, there is a method in which the blocks are inserted at positions that are expanded or contracted in the width direction of the belt. In this case, although a single block does not move in the belt width direction, the width of the slab is changed by inserting a block group whose position has been changed.

As described above, there are various methods of changing the width, but in the present invention, for simplicity, these are collectively referred to as moving the short side mold in the width direction.

The present inventors developed a holding mechanism for this short side mold and filed a patent application for the same (see Japanese Patent Laid-Open No. 61-99541). In this device, the short side molds are disposed so as to be movable along the width direction of the belt 4, and in addition to the short side press blocks on both sides of the cooling surface 6, short side press blocks are also placed inside the cooling lTi 16. This short side presser block can move forward and backward with respect to the back surface of the belt 4 by transmitting the driving force of the extrusion device via the rod. By providing a plurality of such short side press blocks in the width direction of the cooling member 6, the width of the metal ribbon 70 to be manufactured can be changed.

That is, when producing the metal ribbon 7 with the maximum width, both sides of the casting space are partitioned off by the outer short side presser blocks. At this time, the coolant is supplied throughout the gap between the belt 4 and the cooling surface 6. When manufacturing a thin metal strip 7 with a small width, a casting space is formed by moving the short-side mold to an inward location in the belt width direction and pressing the short-side presser block at that location against the belt 4. are doing. And bej
A refrigerant is supplied between the belt 4 and the cooling member 6 which are located inside the short side presser block in the width direction of the reto 40, and the supply of refrigerant to the gap outside the belt 4 is stopped. A plurality of ribs are perforated on the surface of the cooling surface 6 facing the belt 4, which prevents the belt 4 from coming too close to the cooling surface 6 due to the static pressure of the molten metal. This is to ensure a refrigerant flow path.

By making the short side presser block movable in this way, it becomes possible to manufacture the metal ribbon 7 having the required width using one continuous casting device.

In addition, when casting the metal ribbon 7, the part of the entire surface of the belt 4 that comes into contact with the molten metal receives a large heat flow rate, so that the temperature of the belt 4 itself is lower than that of the central part and other parts. Becomes higher. As a result, it is known that the central portion of the belt 4 undergoes thermal expansion, causing the belt 4 to deform. The situation is schematically shown in FIG. As shown in the figure, the center portion of the belt 4 is deformed due to thermal expansion and wrinkles 4b are generated.

An effective way to prevent this deformation is to make the entire surface of the belt 4 a uniform temperature.

For example, in Japanese Patent Publication No. 57-61502,
The cause of belt wrinkles is cold framing on the casting entry side, and as a countermeasure, it is proposed to raise the belt temperature in advance. Also, Utsukai Showa 59-5
In 8550, both ends of the belt in the width direction are heated,
It is suggested that the temperature be the same as the center.

Furthermore, when casting slabs of different widths with one type of belt mold, in the above-mentioned Japanese Patent Publication No. 57-61502,
It has also been proposed to change the amount of cooling water for both ends of the belt.

However, when changing the width of a thin metal strip while continuing to cast it, the cooling section and non-cooling section are changed in accordance with the change in the casting width of the metal thin strip. No measures have been proposed so far.

Furthermore, in Japanese Patent Publication No. 59-4225, the belt is tensioned to a tension of 8,000 to 2 per square inch of belt cross section.
This indicates that a tension of 0,000 pounds is applied.

However, it has been found that even with this method, it is not possible to sufficiently prevent the occurrence of wrinkles in the belt when performing casting that involves changing the width of the slab.

[Problem to be solved by the invention]

When the width of the metal ribbon to be cast is changed, it is necessary to change the supply range of cooling water on the back side of the belt in the belt width direction accordingly. If the area where the cooling water is applied is wider than the casting width, the parts of the belt in the width direction where there is no cast metal will be cooled by the cooling water, or the injection of cooling water into the parts where there is no cast metal will be stopped. Even so, the belt temperature in this area is low,
It is not possible to suppress wrinkles that occur near the center of the belt width. Furthermore, if an attempt is made to reduce the temperature difference in the belt width direction by heating the ends of the belt, this effect will be significantly impaired.

The present invention provides a method for solving the above problems when changing the casting width.

[Means to solve the problem]

In order to achieve the purpose, the belt-type continuous casting method of the present invention that prevents belt deformation has a pair of belts and a pair of short-sided molds that define a pool between the pair of belts. However, in the belt-type continuous casting method in which a metal ribbon is produced by cooling and solidifying the molten metal injected into the sump, when producing slabs with a casting width of less than 1200a+a+, the belt must be coated with lQkgf/a+m' or more. , and both ends of the belt are heated to 100°C or more at 250°C.
It is characterized by heating to a temperature range below ℃.

In addition, casting is performed while maintaining the temperature of a pair of synchronously moving short-side molds that move in synchronization with the metal to be cast within a temperature range of 100°C or more and 150°C or less. When manufacturing pieces,
Applying a tension of 10 kgf/mm2 or more to the belt,
In addition, before the belt starts contacting the molten metal, the entire width of the belt is heated to a temperature range of 100°C or more and 250°C or less, and furthermore, when the belt approaches the casting section, both ends of the belt are heated to a temperature of 100°C or more and 250°C or less. It is characterized by heating to a temperature range of .degree. C. or higher and 250.degree. C. or lower.

Furthermore, when changing the casting width using a synchronously moving short side mold, the synchronously moving short side mold is disposed between the pair of belts so as to be movable in the width direction of the belt, and on the back surface of each of the belts. Following the movement of the synchronously moving short-side mold in the width direction, a cooling medium is supplied to the back side of the belt that is in contact with the slab, and a heating medium is supplied to the back side of the belt that is not in contact with the slab, so that the temperature of the belt is controlled. is maintained in a range of 100°C or more and 250°C or less.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The features of the present invention will be specifically described below with reference to the drawings, using examples in which the present invention is applied to a twin-belt continuous casting method.

FIG. 13 is a diagram showing a schematic configuration of a twin belt type continuous casting machine. The molten metal poured into Tandisi: L1 passes through a nozzle 2 and is injected into a casting space constituted by a belt 4 hung around a pulley 3 and a short mold (not shown).

There is a cooling 6 on the back side of the belt 4, which generally uses cooling water to cool the belt 4 and solidify the molten metal. The completely solidified metal or only the shell solidified metal is continuously drawn out from the lower part of the mold in the form of a metal ribbon 7.

FIG. 1 is a longitudinal sectional perspective view for explaining the overall configuration of a twin-belt continuous casting machine to which the present invention is applied, embodying FIG. Figure 3 illustrates a synchronously moving short side mold.

Figure 2 is for explaining the cooling device section on the back of the belt.
It is a schematic cross section along the XaX0 line of FIG. 1.

In both of these figures, the cooling rain 6 is generated by the upper jet cooling section 6.
a and a pad cooling section 6b.

Since the static pressure of the molten metal is low, the jet cooling section 6a cools the back surface of the belt with a jet water stream ejected from the jet nozzle 63 in order to avoid applying pressure from the back surface of the belt and obtain a high heat removal effect. .

Further, in order to maintain the flatness of the belt, the belt is supported from the back side by a fin roll 64. Pad cooling section 6b
The pad structure is used to remove heat while resisting the static pressure of the molten metal, and pressured cooling water is flowed into the water channel 8. In order to keep the thickness of the water channel 8 constant, the belt 4 is slidably supported by cooling pad fins 12. However, most of the static pressure of the molten metal is supported by the static pressure of the cooling water in the pad, so no large force is applied to the cooling pad fins 12.

The belt 4 is connected to the upstream pulley 52. The downstream pulley 53° steering, the hook is passed to the pulley 54, and the tension
A constant tension is applied by the roller 61, and a driving force is applied from one of the pulleys to rotate.

On the other hand, the short side mold 5 has a structure in which a large number of short side blocks 55 are connected in order to rotate in synchronization with the belt 4, runs along a guide 5B, and is driven by an upstream sprocket 56 or a downstream sprocket 57. has been done. The width of the short side mold 5 can be changed by moving the guide 58 in the width direction of the belt 4. If there is a gap between the short side mold 5 and the belt 4, molten metal will be inserted and cause a gap.In order to eliminate this gap, the jet cooling section 6a is equipped with a belt for pressing the belt of the short side mold. There is a holding block 62, and the pad cooling 1m6b has a mechanism 59 for holding down the belt.

Now, in a belt mold, when the belt comes into contact with molten metal, the temperature increases and the belt is deformed. This deformation of the belt is greatly related to the quality of the slab, and from the viewpoint of ensuring the quality of the slab, it is important to develop means for preventing belt deformation.

In order to investigate in detail the belt deformation behavior of a continuous belt casting machine, the present inventors first used only one unit of the belt mold, removed all the unit cooling water, and
Furthermore, the belt surface was electrically heated, and while changing the heating width, the height of the belt lifting was investigated using a contact displacement meter.

The height of the belt mold is 3.0 m (the distance between the centers of the upstream pulley 52 and the downstream pulley 53), and the belt width is 15 m.
00.1800.2500 mm, and the belt thickness is 1.
It was 2 mm. The belt tension is 5 on average of the belt cross-sectional area.
and 15 kgf/++u++'', and the test was conducted while moving the belt at 2 m/min.

Two predetermined portions in the width direction of the test belt are considered to be the locations where the short side molds exist, and belt pressing metal fittings separately prepared are used to extend the range up to the upstream pulley in the belt length direction at two locations each IQQ mm in the width direction. This suppressed belt displacement.

The belt in the area where this metal fitting is located is not heated.

The belt range between these metal fittings is regarded as the casting width, and the belt length direction distance of 2500 mm from -500 m below the upstream pulley to the downstream pulley is regarded as the range in contact with the cast metal, and the belt temperature in this range is 130~ The temperature was adjusted by adjusting the input of the electric heater so that the temperature reached 150°C.

Immediately after the downstream pulley, the belt was cooled by spraying water at 20°C. In addition, an electric heater is used just before the upstream pulley, depending on the test conditions, for non-heating (belt temperature 20t) and heating (belt temperature 130-150t).
℃).

Furthermore, electric heaters were installed at both ends of the belt, and were used for non-heating (uncontrolled) and heating (belt temperature 130 to 150°C) depending on the test conditions.

Two examples of test results are shown in FIGS. 3 and 4.

FIG. 3 shows a case where the belt width is 1500 mm, and FIG. 4 shows a case where the belt width is 2500 mm.

On the right side of these figures, ■ indicates belt tension of 5 kgf/mm.
(2) is the case where the belt tension is 15 kgf/ma''. In both cases, the belt was not preheated and the belt end was not heated.

(2) is the case where the belt tension was 15 kgf/mm'' and the belt end was heated, and (2) is the case where the belt was preheated before the upstream pulley in addition to the conditions of (2).

In each case, the width of the portion compared to the casting width and the amount of belt displacement are shown.

When the belt width was 1500 mm and the casting width was 1000 mm, that is, when there were cold frames of 250 mm on each side of the belt, the belt displacement was maximum, which was 13.5 mm (■ in Fig. 3). This is when the belt tension is 5 kgf/ml112, but when the belt tension is increased to 15 kgf/mm'', the belt displacement decreases to 9.0 mm, and in addition to this, when both ends of the belt are heated, The belt displacement decreases as shown in (2), and when the belt is preheated in addition to this, the belt displacement further decreases as shown in (2).A similar tendency was observed when the belt width was 2500 mm.

Similar tests were conducted for belt widths of 1800 and 2200 mm.

From these results, the results when the casting width was 500 mm narrower than the belt width are summarized in FIG. 5. In the same figure, conditions (1) to (2) are the same as those in FIGS. 3 and 4.

In the same figure, the broken line (■) indicates the permissible limit value of the belt displacement amount from the viewpoint of slab quality, based on the test results described later.

That is, if the belt displacement amount is 311 Im or less, a good slab can be obtained. In this figure, from the relationship between the lines ■ and ■, the belt width is determined by the casting width with a preliminary width of 500 mm, and when the casting width is less than 1200 mm, the belt displacement amount is reduced to 3 mm or less by heating the # part of the belt. However, when the casting width is 1200 mm or more, it is necessary to heat the belt before it enters the upstream roll in addition to heating the belt end, that is, to preheat the belt to reduce the amount of belt displacement. It was found that this is an essential condition for suppressing the amount of water to 3 m+n or less.

FIG. 6 is a diagram showing the structure near the end of the belt in the embodiment of the present invention. In this embodiment, the short side presser block 9 and the sealing material 11 are used for the range b in the width direction of the belt 4.
and an electromagnetic induction coil 18 for heating the belt end.

The dimension of the electromagnetic induction coil 18 in the belt width direction may be determined appropriately depending on the dimension of the part b of the belt 4 and the heating width dimension necessary to eliminate the temperature difference.
It was set to 20m. Further, the dimension of the electromagnetic induction coil 18 in the belt length direction is 500 mm, and this electromagnetic induction coil 18
Four pieces were arranged at both ends of the belt 4 in the belt length direction.

A required current is applied to the electromagnetic induction coil 18 from a power source (not shown), thereby heating both ends of the belt 40.

The short side mold 5 is pressed down from the back side of the belt 4 by a plurality of short side press blocks 9 provided along the width direction of the belt 4, thereby preventing leakage of poured molten metal.

Then, when changing the width of the manufactured metal ribbon, the actuator 13 moves the belt 4 in and out in the width direction. The short side presser block 9 moves back and forth in accordance with the position of the short side mold 5 that has been moved.

This short side presser block 9 is a plate-shaped member that is long in the width direction of the belt 4. Then, it is guided to the outside of the cooling surface 6 via the rod 10, and is pushed up in the direction of being separated from the belt 4 by the spring 15. The head of the wand 100 is in contact with a camshaft 17 having an eccentric cam 16,
By rotating the camshaft 170, the short side presser blocks 9 are sequentially moved in and out from the outside to the inside or in the opposite direction.

As shown in FIG. 2, the cooling/heating chamber 14 is arranged in multiple stages in the casting direction. Cooling water or heating steam is supplied to this cooling/heating chamber 14 from a supply piston header 21 via a water supply branch waterway 22 .

This cooling water or heating steam cools or heats the belt 4 while traveling from below to above in the water channel 8 on the back surface of the belt 4. Then, it passes through the drainage branch waterway 23, is collected in the drainage piston header 24, and is discharged to the outside of the system. The piston headers 21 and 24 have an inner side serving as a cooling water supply/discharge system, and an outer side serving as a heated steam supply/discharge system. 6th
In the figure, the arrow shown by a dashed dotted line in the heating/cooling chamber 14 indicates the flow path of the cooling water or heating steam when viewed from above.

Using a device with such a configuration, belt mold height 3.
While applying tension to the belt of a belt-type continuous casting machine with a width of 600 m from 1550°C molten steel of ordinary steel composition.
A steel strip with a thickness of 50 mm was produced. Here, belt 4
A steel belt with a width of 11,040 nm and a thickness of 1.5 mm was used, and a range of 120 mm from both ends of the belt was heated to an average temperature of 120°C. FIG. 7 is a graph showing the relationship between the tension applied to the belt 4 and the maximum displacement of the belt 4 at this time.

The amount of displacement of the belt 4 was measured using an eddy current displacement meter.
Fig. 7 shows the maximum displacement along the width direction.

is taken as the vertical axis.

As is clear from FIG. 7, by applying tension while heating both ends of the belt 40, deformation of the belt 4 can be significantly suppressed. The deformation of this belt 4 is
This also affects cracks that occur inside the metal ribbon 7. FIG. 8 is a graph showing the relationship between the amount of displacement of the belt 4 and the length of internal cracks. In the figure, ○ indicates the case where the tension applied to the belt 4 is 10 kgf/mm' or more.
indicates the case where the tension is less than 10 kgf/mm''.

As described above, the reason why the internal cracks become larger as the belt 4 deforms is that the deformation disturbs the generation and growth conditions of the solidified shell, creating areas in the solidified shell where local stress tends to concentrate. it is conceivable that. Enlargement of this internal crack can be suppressed by setting the amount of displacement of the belt 4 to 3 mm or less.

And, this displacement amount of 3 mm or less is '! As is clear from Figure J7, the tension applied to the belt 4 is 10 kgf/
mm" or more. The lower limit of the tension in the present invention is determined in this way.

Further, the heating temperature at both ends of the belt 4 needs to be 100° C. or higher. The heating temperature at both ends is 100
If the temperature is less than 0.degree. C., the above-mentioned temperature difference in the belt width direction cannot be reduced, and the effect of preventing widthwise deformation is small. On the other hand, if the heating temperature at both ends of the belt exceeds 250°C, there is a risk that the belt 4 itself will yield under the above tension, so it is preferable to set the upper limit of the heating temperature to 250°C.

The dimension of the electromagnetic induction coil 18 in the belt length direction is as follows:
The dimensions can be determined as appropriate for the coil design. Further, a plurality of electromagnetic induction coils 18 may be provided at both ends of the belt 4 at appropriate intervals in the belt length direction.

Here, as the belt 4, a steel plate having a tensile strength of 50 kgf/mm" or more is often used;
It is also possible to use a belt made of stainless steel, high nickel-containing steel, high chromium-containing -9 or other high-alloy steel, etc., which has a tensile strength of more than m''.

Next, restrictive conditions for heating the short-side mold 5 will be explained using examples.

Steel strips were produced in a belt-type continuous casting machine.

The width of the belt used in the belt mold was 1900 mm and the thickness was 1.2 mm. The 100 bars at both ends of the belt were each heated to 100 to 120 degrees Celsius by electromagnetic induction heating, and the next 30 mm was in contact with the sealing material. 50 each inside
In case (2), the back side of the belt is heated with superheated steam at 120°C, and the next 90mm inner belt parts are in contact with a copper synchronously moving short side mold, and the belt tension is 15kgf/mm2. The casting width of the copper strip was 1360 m+n, and the thickness was 50 mm.

On the other hand, the amount of water in the short-side mold cooling device was varied, and the surface temperature of the short-side mold was measured in advance with a contact thermometer just before insertion into the casting part, so that the temperature of the short-side mold could be estimated from the operating conditions.

After making the above preparations, casting was performed with various cooling conditions of the short side mold, and the relationship with slab quality was investigated.
The results shown in FIG. 9 were obtained.

In the figure, ■ indicates the length of internal cracks in the slab, and ■ indicates the short side mold damage index.

From this result, in order to reduce the length of internal cracks in the slab to 1.5 mm or less, it is necessary to set the short side mold temperature to 100° C. or higher. If the short side mold temperature is less than 100°C, the belt will be cooled by the short side mold and wrinkles will occur, resulting in poor slab quality.
It was found that when the temperature exceeded ℃, the damage to the short side mold gradually increased. Therefore, a suitable range for the short side mold temperature is 100 to 150°C.

In the above example, the width of the slab was 600 mm, but next, a casting test was conducted where the width of the slab was wider, that is, the width of the slab was 1900 mm.

The belt width used in the belt mold was 2480 mm, and its thickness was 1.2 mm. The structure near the end of the belt is the same as that shown in FIG. 6 above, but in this embodiment, as shown in FIG. 10, the operating state of the short side presser block 9 and the cooling/heating state of the belt 4 are This is different from the case shown in FIG. That is, the portion 100 mm from the end of the belt 4 is heated to 100 to 120°C by the electromagnetic induction coil 18, and then heated to 100 to 120°C.
0 mm is in contact with the sealing material 11, and 50 mm is in contact with the sealing material 11, and the next 50 mm is 110~
Heated to 120℃, then 90ITIff+ is 1
It is in contact with a short side mold 5 made of copper whose temperature is controlled at 10 to 120°C, and the next 1900 mm is in contact with the cast metal. Among the belts in contact with the short-side mold 5, the back side of the 50 mm section closer to the belt edge is heated by 1 steam heating.
Among the belts that are heated to 10 to 120°C and are in contact with the short side mold 5, a 40 mm portion of the belt that is close to the belt that is in contact with the molten metal.
The back side of the belt is cooled by cooling water. Further, the back surface of the belt in contact with the molten metal is cooled by cooling water.

Furthermore, before the belt 4 enters the upstream pulley, the belt 4 is heated to 120 to 140°C by a preheater 60 shown in FIG.
The test conditions were with and without heating.

Under the conditions shown above, with the belt tension as a variable,
A steel casting test was conducted, the displacement of the belt was measured using the same method as described above, and the occurrence of internal cracks in the slab was investigated. The measurement results of the belt maximum displacement are shown in FIG.

In this figure, ■ is the case where heating is not performed by the preheater 60, and ■ is the case when the preheater 60 is used. By preheating the belt to 120 to 140° C. using the preheater 60 and increasing the belt tension to 8 kgf/nm or more, the maximum displacement of the belt could be suppressed to 3 M or less. By applying a predetermined tension to the belt 4 and preheating the belt 4, it was possible to suppress the length of internal cracks in the slab.

The above shows an example of heating and preheating the ends of the belt, but under the condition that the belt width is 1500 mm or less and the casting width is 200 m narrower than the belt width, that is, there is a short strip of 1.00 mm width at each end of the belt. In the case of conditions where side molds exist, belt deformation can be prevented by maintaining the temperature of the short side molds at 100 to 150°C without heating or preheating the ends of the belt as described above. .

FIG. 12 shows the structure near the end of the mold in this example.

The slab width is 1500 mm, and conditions are such that cooling water is allowed to flow into the cooling/heating chamber 14 adjacent to the short-side mold 5. The displacement of the belt 4 at this time is the casting width 13 of the curve ■ in Fig. 3.
A value almost equivalent to the belt displacement of 2.6 mm at 0.00 mm was obtained, which was an acceptable value in terms of slab quality.

〔Effect of the invention〕

As explained above, in the present invention, belt end heating is performed as a means for preventing belt deformation, depending on the belt width and the casting width at that time.

Means were provided for belt preheating, belt tensioning, and short side mold heating.

As a result, the amount of belt displacement is suppressed to 3 mm or less, and the quality of the slab can be improved.

[Brief explanation of the drawing]

Fig. 1 is a vertical perspective view showing the overall configuration of a belt type continuous casting machine to which the present invention is applied, Fig. 2 is a schematic sectional view taken along the Xo-Xo line in Fig. 1, and Figs. Add tension and heat to the ends of the belt. Figure 6 is a diagram showing the effect of preheating, Figure 6 is a diagram showing the structure near the belt end, Figure 7 is a diagram showing the effect of belt tension and belt end heating on the maximum displacement of the belt, and Figure 8 is a diagram showing the effect of belt end heating. A diagram showing the relationship between the maximum displacement amount and the length of internal cracks in the slab, Figure 9 is a diagram showing the relationship between the short side mold temperature and the length of internal cracks in the slab,
Figure 10 is a diagram showing an example in which the belt end is heated by electromagnetic induction and the inside thereof is heated by steam, Figure 11 is a diagram showing the amount of displacement of the belt on the same side, and Figure 12 is a diagram in which the belt end is not heated. It is a figure showing an example. FIG. 13 is a diagram showing a schematic configuration of a twin-belt continuous casting machine, and FIG. 14 is a diagram schematically showing belt deformation that occurs during casting. 1: Tandissi: L2: Nozzle 3: Pulley 4: Belt 4b: If on the belt 5: Short side mold 6: Cooling tank 6a: Jet cooling section 6b: Pad cooling section
7: Metal thin strip 8: Water channel 9: Short side holding block 10: Rod 11: Seal material 12: Cooling pad fin 13: Actuator 14: Cooling/heating chamber 15 Spring 16: Eccentric cam 17: Cam shaft 18: Electromagnetic induction Coil 21.24: Piston header 2
2.23: Branch waterway 51: Mold 52, 53.54
: Pulley 55: Short side block 56. 57: Sprocket 58: Short side block guide 59: Belt holding mechanism 60: Preheater 61: Tension cylinder 62: Belt holding block 63: Jet nozzle 64: Fin roll patent applicant Made by Shin Nippon Iron Co., Ltd. Agent
Masu Kobori (and 2 others) Figure 1 Figure 2

Claims (1)

[Claims] 1. It has a pair of belts and a pair of short side molds that define a pool between the pair of belts, and the molten metal poured into the pool is cooled and solidified. In the belt-type continuous casting method to produce metal ribbon, the casting width is 1200 m.
When manufacturing slabs of less than m, 10 kg is added to the belt.
A belt-type continuous casting method that prevents belt deformation, characterized by applying a tension of f/mm^2 or more and heating both ends of the belt to a temperature range of 100° C. or more and 250° C. or less. 2. It has a pair of belts and a pair of short side molds that define a pool between the pair of belts, and the molten metal poured into the pool is cooled and solidified to form a metal ribbon. In the belt-type continuous casting method, the temperature of a pair of synchronously moving short-side molds that move in synchronization with the metal to be cast is set to 10
A belt-type continuous casting method that prevents belt deformation, characterized in that casting is performed while maintaining the temperature in a range of 0°C or more and 150°C or less. 3. It has a pair of belts and a pair of short side molds that define a pool between the pair of belts, and the molten metal poured into the pool is cooled and solidified to form a thin metal strip. In the belt type continuous casting method, the casting width is 1200m.
When manufacturing slabs of m or more, 10 kg is added to the belt.
A tension of f/mm^2 or more is applied, and a tension of 100 mm is applied over the entire belt width before the belt starts contacting the molten metal.
The belt is heated to a temperature range of 100°C to 250°C, and further, when the belt approaches the casting section, both ends of the belt are heated to a temperature range of 100°C to 250°C. A belt-type continuous casting method that prevents belt deformation. 4. It has a pair of belts and a pair of synchronously moving short-side molds that define a pool between the pair of belts, and the molten metal poured into the pool is cooled and solidified to form a metal thin film. In the belt-type continuous casting method for producing a belt, the synchronously moving short side mold is disposed between the pair of belts so as to be movable in the width direction of the belt, and the synchronously moving short side mold is disposed between the pair of belts so as to be movable in the belt width direction. Following the widthwise movement of
A cooling medium is supplied to the back side of the belt that is in contact with the slab, a heating medium is supplied to the back side of the belt that is not in contact with the slab, and the belt is heated to a temperature range of 100°C or higher and 250°C or lower. A belt-type continuous casting method that prevents belt deformation and is characterized by applying a tension of /mm^2 or more. 5. It has a pair of belts and a pair of synchronously moving short-side molds that define a pool between the pair of belts, and the molten metal poured into the pool is cooled and solidified to form a metal thin film. In the belt-type continuous casting method for manufacturing bands, the casting width is 1
When producing slabs of 200 mm or more, the synchronously movable short-side mold is disposed between the pair of belts so as to be movable in the width direction of the belts, and the belts are loaded with a load of 10 kgf/mm^.
2 or more tension is applied, and the belt is heated to a temperature of 100° C. or more over the entire width of the belt before it starts contacting the molten metal.
Be sure to heat it to a temperature range of 50°C or less, and
At the point where the belt approaches the casting section, a cooling medium is supplied to the back side of the belt in contact with the slab, following the width direction movement of the synchronously moving short-side molds on each back side of the belt, and A belt-type continuous casting method that prevents belt deformation, characterized in that a heating medium is supplied to the back side of the belt that does not touch the belt, and the belt is maintained in a temperature range of 100° C. or higher and 250° C. or lower.