JPH0929398A - Equipment and method for belt type continuous casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out coating without irregularity on a belt. SOLUTION: An applicator roll 2 which is rotated in a reverse direction to the traveling direction of a belt 13 is provided while the applicator roll is abutted on the belt 13 on the surface side of the belt 13 on the upstream side of a nozzle 11a to pour the molten metal 31. An adjustment roll 3 which is rotated in the same direction as the applicator roll 2 with the clearance between the applicator roll 2 and the adjustment roll is provided on the downstream side in the traveling direction of the belt 13 of the applicator roll 2, and a pair of weirs to partition the inner side in the axial direction of the rolls 2, 3 and the outer side thereof are provided between the applicator roll 2 and the adjustment roll 3. A feed tube 5 whose tip is directed in the range partitioned by a wair 4 between the applicator roll 2 and the adjustment roll 3 is provided, and a base end of the feed tube 5 is connected to a storage tank 7 filled with the coating agent 41 through a feed pump 6.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a belt type continuous casting apparatus and a belt type continuous casting method.

[0002]

2. Description of the Related Art A conventional belt type continuous casting apparatus is shown in FIGS.
This will be described with reference to FIG. A pair of upper pulleys 12a are provided near the nozzle 11a on the lower part of the tundish 11 so as to sandwich the nozzle 11a. Below the upper pulley 12a, a pair of lower pulleys 12b similar to the upper pulley 12a is provided. These upper pulley 1
Intermediate pulleys 12c are provided on the outer sides of the lower pulley 12b and the lower pulley 12b in the opposing direction. The pulley 12
a, 12b, 12c have these pulleys 12a, 12
Belts 13 are hung so as to connect between b and 12c. That is, the pulleys 12a, 12
The belt 13 travels between the pulleys 12a, 12b, 12c by the rotation of b, 12c.

A mold block 14 is provided between the opposing belts 13 on both ends of the upper pulley 12a and the lower pulley 12b.
A mold running machine 14 is provided for running the a along the running direction of the belt 13. Further, between the upper pulley 12a and the lower pulley 12b, a cooling device (not shown) that cools the belt 13 running between them from the back surface is provided.

That is, the pulleys 12a, 12b, 12
While rotating the belt 13 by the rotation of c, the mold traveling machine 14 is operated to move the mold block 14a, and the molten metal 31 in the tundish 11 flows out from the nozzle 11a while the belt 13 is cooled by the cooling device. By doing so, the molten metal 31 is cast between the belt 13 and the mold block 14a, and the slab 32, which is a cast piece, is obtained from below between the lower pulleys 12b.

In the belt type continuous casting apparatus for performing continuous casting in this manner, in order to prevent damage to the belt 13 due to heat of the molten metal 31 and rapid cooling of the molten metal 31 by the cooling device, continuous casting is being performed. The surface of the belt 13 is coated.

That is, as shown in FIG. 6, the upper pulley 12
A pump 22 for feeding the coating agent 41 in the storage tank 23 is provided with a plurality of spray nozzles 21 each having a tip directed toward the surface of the belt 13 running between the a and the intermediate pulley 12c at a predetermined interval in the width direction of the belt 13. The spray nozzle 21
And a heater 24 for electromagnetically heating the belt 13 provided on the downstream side of the spray nozzle 21 in the traveling direction of the belt 13 between the pulleys 12a and 12c.
The coating agent 41 in 3 is sprayed from the spray nozzle 21 to the belt 13 by the pump 22, and the belt 1 is heated by the heater
The coating agent 41 is dried by heating 3 to coat the surface of the belt 13. Reference numeral 25 is a brush for removing the used coating agent 41 from the surface of the belt 13.

[0007]

The belt-type continuous casting apparatus for performing continuous casting while coating the surface of the belt 13 as described above has the following problems.

From the spray nozzle 21 to the coating agent 4
If it receives wind or the like when jetting 1, the coating agent 41 will be scattered. Since the coating agent 41 becomes a droplet at the tip portion of the spray nozzle 21, the droplet drops on the belt 13 or solidifies at the tip portion of the spray nozzle 21 to cause clogging. When the above-mentioned situation occurs, the coating on the belt 13 becomes uneven, and it becomes difficult to cast the uniform and good slab 32.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a belt type continuous casting apparatus according to the present invention comprises a pair of endless belts which are arranged facing each other and whose facing surfaces run in the same direction. A casting space is formed by a mold closing both widthwise end sides, and the molten metal is injected into the casting space,
In a belt type continuous casting apparatus for manufacturing a cast product by cooling from the back surface of the endless belt, an adjusting roll provided along the width direction of the endless belt and adjusting the flow rate of the coating agent by rotation, and this adjusting roll. An applicator roll that forms a pool of the coating agent with a predetermined interval and contacts the endless belt to rotate to apply the coating agent to the endless belt, and the endless belt at the position of the applicator roll. A belt coating device provided on the back side of the endless belt and provided with the applicator roll and a backup member for holding the endless belt is provided, and a coating agent drying means is provided on the downstream side of the endless belt of the belt coating device. It is characterized by

In the belt type continuous casting apparatus according to the present invention, the applicator roll rotates against the running of the belt, and the adjusting roll rotates in the same direction as the rotation direction of the applicator roll. It is characterized by

In the belt type continuous casting apparatus according to the present invention, weirs are provided at both ends of the pool formed by the adjusting roll and the applicator roll, the dam being in contact with the peripheral surface of the roll, and the weir is provided. It is characterized in that it can move in the axial direction of the roll.

The belt type continuous casting apparatus according to the present invention is characterized in that a return flow passage for suppressing the amount of the coating agent in the reservoir is connected to the weir.

Further, in the belt type continuous casting method according to the present invention, a pair of endless belts, which are laid across a plurality of pulleys and are opposed to each other, are run, and the endless belts and both end sides in the width direction of the endless belts are closed. Injecting the molten metal into the mold space formed by the mold, before the molten metal is injected into the mold space, an applicator roll contacting each of the endless belts and an adjusting roll attached to the applicator roll. By applying a coating agent on the surface of the endless belt, by continuously performing the application thereafter, to prevent thermal damage to the endless belt when the endless belt receives the melt, It is characterized in that the cooling rate is moderated to prevent cracking of the solidified shell and continuous production of high quality slabs.

The belt-type continuous casting method according to the present invention is characterized in that the coating thickness of the coating agent applied to the endless belt is adjusted by adjusting the rotation speed of the adjusting roll.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of an embodiment of a belt type continuous casting apparatus and a belt type continuous casting method according to the present invention is shown in FIG.
3 will be described. 1 is a schematic side view showing the configuration of the apparatus, FIG. 2 is a schematic side view showing the configuration of the main part of FIG. 1, and FIG. 3 is a schematic plan view of FIG.

As shown in FIG. 1, a pair of upper pulleys 12a are provided near the nozzle 11a for letting out the molten metal 31 so as to sandwich the nozzle 11a. Below the upper pulley 12a, a pair of lower pulleys 12b similar to the upper pulley 12a is provided. Intermediate pulleys 12c are provided on the outer sides of the upper pulley 12a and the lower pulley 12b in the opposing direction (however, in FIG. 1).
Middle and left side omitted). The pulleys 12a, 12b, 12c
The endless belt (hereinafter simply referred to as a belt) 1 for connecting the pulleys 12a, 12b, 12c to each other.
Each of the three is passed over. That is, as the pulleys 12a, 12b, 12c rotate, the belt 13 travels between the pulleys 12a, 12b, 12c.

On the back side of the belt 13 between the upper pulley 12a and the lower pulley 12b, there are provided cooling devices 15 for cooling the belt 13 running between them from the back side. The cooling device 15 has a jet cooling section 15a at its upper side and a pad cooling section 15b at its lower side. In order to obtain a high heat removal effect, the jet flow cooling unit 15a cools the upper portion of the belt 13 from its back surface by a jet water flow jetted from a jet nozzle (not shown). On the other hand, the pad cooling section 15b has a pad structure for removing heat while facing the static pressure of the molten metal, and cooling water having a pressure flows between the pad cooling section 15b and the back surface of the belt 13.

Between the opposite belts 13 on both ends of the upper pulley 12a and the lower pulley 12b, there are provided mold running machines (not shown) for running the mold block along the running direction of the belt 13, respectively. The blocks are configured to close both widthwise ends of the belts 13. That is, the mold space is formed by the belt 13 and the mold block.

On the other hand, as shown in FIG. 1, the upper pulley 12a
A backup plate 1 that is a backup member that slidably supports the belt 13 over the entire width direction is provided on the back surface side of the belt 13 running between the intermediate pulley 12c and the intermediate pulley 12c. On the side of the backup plate 1 facing the belt 13, an applicator roll 2 that abuts over the entire width direction of the belt 13 and rotates so as to oppose the running of the belt 13 is formed between the backup plate 1 and the applicator roll 2. It is provided so as to hold the belt 13.

As shown in FIG. 2, the applicator roll 2
An adjusting roll 3 having a length similar to that of the applicator roll 2 is provided near the downstream side of the belt 13 in the traveling direction, and the adjusting roll 3 is driven by a drive device (not shown). The speed of the roll 2 is adjusted while rotating in the same direction as the rotation direction of the roll 2, and the roll 2 is movable so that the size of the gap with the applicator roll 2 can be adjusted.

As shown in FIGS. 2 (b) and 3, between the applicator roll 2 and the adjusting roll 3, the peripheral surfaces of the rolls 2 and 3 are brought into contact with each other so that the rolls 2 and 3 are separated from each other. A pair of weirs 4 is provided to partition the rolls 2 and 3 into an inner side and an outer side in the axial direction, and the weirs 4 are moved along the axial directions of the rolls 2 and 3 by a moving device (not shown). You can do it. These weirs 4 are made of an elastic material such as hard urethane,
The contact portion with 3 is coated with a material such as fluororesin that has a small frictional resistance and is hard to wear. That is, even if the adjusting roll 3 is moved in accordance with the adjustment of the size of the gap between the applicator roll 2 and the adjusting roll 3, the rolls 2, 3 and the weir 4 are always in contact with each other. .

As shown in FIG. 2A, in the vicinity of the applicator roll 2 and the adjusting roll 3, a supply pipe 5 is arranged with its tip facing the gap. As shown in FIG. 1, the base end of the supply pipe 5 is connected to the delivery side of the feed pump 6, the inflow side of the feed pump 6 is connected to the storage tank 7, and the inside of the storage tank 7 is It is filled with the coating agent 41. That is, by operating the feed pump 6, the coating agent 41 in the storage tank 7 is within the range partitioned by the weir 4 between the applicator roll 2 and the adjusting roll 3 of the supply pipe 5, that is, It is supplied to the reservoir. With such a supply pipe 5, a feed pump 6, and a storage tank 7,
In this embodiment, the supply means is configured.

As shown in FIGS. 2 (b) and 3, the weir 4 is formed with holes 4a penetrating the weir 4 along the axial direction of the rolls 2 and 3, respectively. The outside of the holes 4a of the weir 4 in the axial direction of the rolls 2 and 3 is connected to the storage tank 7 by a hose 7a which is a return flow passage shown in FIG. The surplus of the supplied coating agent 41 is returned from the hole 4a of the weir 4 to the storage tank 7 via the hose 7a. That is, the hose 7a suppresses the amount of the coating agent 41 in the reservoir.

As shown in FIG. 2 (a), a scraper 8 is provided above the peripheral surface of the adjusting roll 3 so as to come into contact therewith over the entire axial direction of the adjusting roll 3, and is attached to the adjusting roll 3. The coating agent 41 is scraped off from the adjusting roll 3 by the scraper 8. In this embodiment, a belt coating device is constituted by various members such as the backup plate 1, the applicator roll 2 and the adjusting roll 3.

As shown in FIG. 1, the upper pulley 1 of the belt 13 running between the upper pulley 12a and the intermediate pulley 12c.
A heater 24 that is a coating agent drying unit that electromagnetically heats the belt 13 is provided near 2a. A sensor 9a such as an electromagnetic film thickness meter, which is a measuring unit for measuring the thickness of the coating agent 41 on the surface of the belt 13, is provided on the downstream side of the heater 24 with respect to the belt 13. The sensor 9a is electrically connected to an input part of the control device 9 (not shown) which is a control means, and the drive device of the adjusting roll 3 is electrically connected to the output part of the control device 9. (Not shown), the control device 9 controls the drive device so as to adjust the rotation speed of the adjusting roll 3 and the size of the gap between the adjusting roll 3 and the applicator roll 2 based on the signal from the sensor 9a. It is supposed to do.

In FIG. 1, reference numeral 25 is a brush, and the above-mentioned members are similarly provided on the left side of the nozzle 11a.

A belt type continuous casting method using such a belt type continuous casting apparatus will be described below. The pulley 12
While the belt 13 is run by the rotation of a, 12b, and 12c, the distance of the opposing weir 4 is adjusted by the moving device, the applicator roll 2 and the adjusting roll 3 are rotated, and the feed pump 6 is operated to perform coating. When the agent 41 is supplied to the reservoir between the applicator roll 2 and the adjusting roll 3 and divided by the weir 4, that is, the coating agent 41 supplied into the reservoir is adjusted to the adjusting roll 2
While being uniformly agitated in the pool by the rotation of, the applicator roll 2 is rotated to be sent out from between the applicator roll 2 and the adjusting roll 3 and evenly applied to the surface of the belt 13. On this occasion,
The coating agent 41 adhering to the adjusting roll 3 is scraped off by the scraper 8 and returned to the inside of the pool portion, and the excess coating agent 41 in the pool portion is removed by the weir 4.
It is returned to the storage tank 7 from the hole 4a through the hose 7a.

On the other hand, the coating agent 41 applied to the belt 13 is dried by heating the belt 13 by the heater 24, and then the thickness value is measured by the sensor 9a. Based on the signal from the sensor 9a, the control device 9 controls the drive device so as to increase the rotation speed of the adjusting roll 3 when the value is larger than the predetermined value, and the value is the predetermined value. If it is smaller than the value, the drive unit is controlled so as to slow down the rotation speed of the adjusting roll 3. That is,
Since the adjusting roll 3 is rotating in the direction against the flow of the coating agent 41 flowing out from the gap between the adjusting roll 3 and the applicator roll 2, increasing the speed thereof makes it difficult for the coating agent 41 to flow out from the above gap. When the speed is slowed down, the coating agent 41 easily flows out from the gap.

Even if the coating amount of the coating agent 41 on the belt 13 is adjusted in this way, the adjustment becomes insufficient due to the properties of the coating agent 41 (for example, the particle size of the coating agent 41 is In the case of a relatively large size or a small size), the control device 9 controls the adjusting roll 3
The drive device is controlled so as to adjust the size of the gap between the adjusting roll 3 and the applicator roll 2 by moving the. That is, when a sufficient coating amount cannot be obtained only by decreasing the speed of the adjusting roll 3 such as when the particle diameter of the coating agent 41 is relatively large, the gap is increased to
The coating agent 41 can be applied in a predetermined amount by increasing the flow rate of the coating agent 41 delivered from the gap, and when the particle diameter of the coating agent 41 is relatively small, the application amount can be increased only by increasing the speed of the adjusting roll 3. When it is not possible to suppress the above, it is possible to apply the coating agent 41 in a predetermined amount by reducing the flow rate of the coating agent 41 sent out from the gap by reducing the gap.

The state of the adjusting roll 3 and the belt 1 as described above.
FIG. 4 shows the relationship between the coating agent 41 and the coating agent 41 of FIG.
In FIG. 4, the horizontal axis represents the rotation speed of the adjusting roll 3, the vertical axis represents the coating thickness of the coating agent 41 on the belt 13, and the curve A represents the gap between the adjusting roll 3 and the applicator roll 2. Is large, and the curve B shows the value when the gap between the adjusting roll 3 and the applicator roll 2 is small. However, the rotation speed of the applicator roll 2 is constant, and the speed of the applicator roll 2 is the belt 13
Same as the speed of. As can be seen from this graph, if the rotation speed of the adjusting roll 3 and the size of the gap between the adjusting roll 3 and the applicator roll 2 are adjusted, the size within the range surrounded by the curves A and B in the graph is adjusted. Thus, the coating thickness of the coating agent 41 can be easily adjusted.

The belt 13 to which the coating material 41 is uniformly applied with a predetermined thickness as described above is sent between the upper pulley 12a and the lower pulley 12b, and the molten metal 31 from the nozzle 11a faces the belt 13. The vehicle travels while being interposed therebetween, and is sent between the lower pulley 12b and the intermediate pulley 12c while being cooled by the cooling device 15. At this time, the molten metal 31 is cooled by the cooling device 15 through the belt 13 and the layer of the uniform coating agent 41,
It is cast evenly, and is sent out from below between the lower pulleys 12b as a slab 32 which is a uniformly cast piece.

The belt 13 sent between the lower pulley 12b and the intermediate pulley 12c has a coating agent 4 on its surface.
After 1 is removed by the brush 25, it is sent between the backup plate 1 and the applicator roll 2, and the coating agent 41 is applied again in the same manner as described above.

Therefore, the coating agent 41 is applied to the belt 13
Since the coating can be applied evenly, it is possible to reliably prevent the belt 13 from being damaged by heat when the belt 13 receives the molten metal 31, and the cooling rate of the molten metal 31 is made uniform and gentle so that the slab 32 is generated. It is possible to reliably prevent cracking of the solidified shell. Therefore, a good quality slab 32
Can be continuously and easily cast.

The applicator roll 2 is attached to the belt 13
Of the coating material 41 between the applicator roll 2 and the adjusting roll 3 to the belt 13 by rotating the adjusting roll 3 in the same direction as the rotating direction of the applicator roll 2. While the applicator roll 2 is rotated so as to apply the coating agent 41, the adjusting roll 3 is rotated so as to evenly stir the coating agent 41. Therefore, the coating agent 41 is not covered by the gap between the applicator roll 2 and the adjusting roll 3. The coating on the belt 13 can be efficiently performed without clogging.

Further, since the weir 4 can be moved along the axial direction of the rolls 2 and 3, the coating range of the coating agent 41 in the width direction of the belt 13 can be easily adjusted. In addition, when the coating agent 41 in the pool portion between the applicator roll 2 and the adjusting roll 3 has an excessive amount, such as when the distance between the opposing weirs 4 is shortened, the hose is passed through the hole 4a of the weir 4 to the hose. Since the surplus is returned to the storage layer 7 via 7a, even if the surplus occurs, it is not necessary to adjust the delivery amount of the coating agent 41 by the delivery pump 6. Therefore, it is not necessary to provide a control mechanism or the like on the feed pump 6 or the like, and the device configuration can be simplified.

Further, since the size of the gap between the applicator roll 2 and the adjusting roll 3 can be adjusted, it is possible to easily adjust the degree of application to the belt 13 according to the properties of the coating agent 41 and the like. Further, since the control device 9 controls the rotation speed of the adjusting roll 3 and the size of the gap between the applicator roll 2 and the adjusting roll 3 based on the signal from the sensor 9a, the coating agent 41 is always applied to the belt 13 at a predetermined level. It can be easily applied with a thickness of.

In the embodiment described above, the thickness of the coating material 41 on the surface of the belt 13 is measured by the sensor 9a such as an electromagnetic film thickness meter, and the controller 9 determines the above value based on the signal. The rotation speed of the adjusting roll 3 and the size of the gap between the applicator roll 2 and the adjusting roll 3 are controlled so that the value becomes a predetermined value. For example, the sensor for measuring the value of the temperature of the belt 13 is 9a is provided, and the rotation speed of the adjusting roll 3 and the size of the gap between the applicator roll 2 and the adjusting roll 3 are controlled based on the signal from this sensor so that the temperature value becomes a predetermined value. By providing a control device that operates in place of the control device 9, it is possible to obtain the same effect as that of the above-described embodiment. Because there is a correlation between the temperature of the belt 13 and the thickness of the coating agent 41, the thickness of the coating agent 41 is thin when the temperature of the belt 13 is high, and the thickness of the coating agent 41 is low when the temperature of the belt 13 is low. This is because the thickness of the coating agent 41 can be obtained from the temperature of the belt 13 based on the above correlation obtained in advance by experiments or the like because the thickness of the coating agent 41 is large.

[0038]

According to the belt type continuous casting apparatus and the belt type continuous casting method of the present invention, the following effects can be obtained. Since the coating agent can be applied evenly to the belt, heat damage to the belt when the belt receives the molten metal can be reliably prevented, and the cooling rate for cooling the molten metal can be made evenly gentle, and the slab can be cast. It is possible to reliably prevent the cracking of the solidified shell that occurs in the. Therefore, it is possible to continuously and easily produce a high quality slab.

The applicator roll is rotated against the running of the belt, and the adjusting roll is rotated in the same direction as the direction of rotation of the applicator roll, that is, the coating agent is applied to apply the coating agent to the belt. Since the adjusting roll is rotated so as to stir the coating agent while rotating the cater roll, the coating agent can be efficiently applied to the belt without clogging.

Since the weir can be moved along the axial direction of the roll, the coating range of the coating agent in the width direction of the belt can be easily adjusted. Since the amount of the coating agent in the reservoir is suppressed in the return flow path, it is not necessary to provide a mechanism for controlling the amount of the coating agent fed, and the device configuration can be simplified.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a configuration of an embodiment of a belt type continuous casting apparatus according to the present invention.

FIG. 2 is a schematic side view showing a configuration of a main part of FIG.

FIG. 3 is a schematic plan view of FIG.

FIG. 4 is a graph showing the relationship between the rotation speed of the adjusting roll and the coating thickness of the coating agent on the belt for each size of the gap between the applicator roll and the adjusting roll.

FIG. 5 is a perspective view showing the overall structure of a belt type continuous casting device.

FIG. 6 is a schematic side view showing a configuration of a main part of a conventional belt type continuous casting device.

[Explanation of symbols]

 2 Applicator roll 3 Adjustment roll 4 Weir 4a Hole 5 Supply pipe 6 Feed pump 7 Storage tank 7a Hose 9 Control device 9a Sensor 11a Nozzle 12a Upper pulley 12b Lower pulley 12c Intermediate pulley 13 Belt 31 Molten metal 32 Slab 41 Coating agent

Claims (6)

[Claims] 1. A casting space is formed by a pair of endless belts which are arranged opposite to each other and whose opposite surfaces run in the same direction, and a mold which closes both widthwise end sides of the endless belt, and a molten metal is injected into the casting space. A belt type continuous casting apparatus for manufacturing a cast piece by cooling from the back surface of the endless belt, an adjusting roll provided along the width direction of the endless belt and adjusting the flow rate of the coating agent by rotation, and this adjusting roll And an applicator roll that forms a pool of the coating agent with a predetermined interval and that contacts the endless belt and rotates to apply the coating agent to the endless belt, and the endless belt at the position of the applicator roll. A belt coat provided on the back side of the belt and provided with a backup member that holds the endless belt together with the applicator roll. Provided with a Ingu device, the endless belt belt type continuous casting apparatus characterized in that a coating agent drying unit downstream of the belt coating apparatus. 2. The applicator roll rotates against the running of the belt, and the adjusting roll rotates in the same direction as the rotation direction of the applicator roll. The belt type continuous casting device described. 3. A weir that comes into contact with the peripheral surface of the roll is provided at both ends of the pool formed by the adjusting roll and the applicator roll, and the weir is movable in the axial direction of the roll. The belt-type continuous casting device according to claim 1 or 2, characterized in that. 4. The belt-type continuous casting apparatus according to claim 3, wherein a return flow passage that suppresses the amount of the coating agent in the pool is connected to the weir. 5. A pair of endless belts, which are wound around a plurality of pulleys and arranged to face each other, are made to travel, and molten metal is contained in a mold space formed by these endless belts and a mold that closes both widthwise end sides of the endless belts. Is injected, before the molten metal is injected into the mold space, on the surface of the endless belt by rotating the applicator roll contacting each of the endless belt and the adjusting roll attached to the applicator roll. By applying a coating agent and subsequently performing the application continuously, the endless belt prevents thermal damage to the endless belt when receiving the molten metal, moderates the cooling rate of the molten metal, and solidifies the solidified shell. A belt-type continuous casting method, which is characterized by preventing the occurrence of cracks and continuously producing high quality slabs. 6. The belt type continuous casting method according to claim 5, wherein the coating thickness of the coating agent applied to the endless belt is adjusted by adjusting the rotation speed of the adjusting roll.