JPH042340B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention allows the casting width of the metal ribbon to be manufactured to be freely changed, and the cooling width of the belt can be changed in accordance with the change in the casting width. This article relates to a twin-belt continuous metal ribbon casting machine that can cast metal thin strips.

(Conventional technology) Recently, it has become possible to obtain numbers close to the final shape from molten metal such as molten steel.
Continuous casting methods that directly produce metal ribbons with a thickness of about 10 mm to several tens of mm are attracting attention. 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 type of continuous casting is the twin belt method.

FIG. 4 is a diagram schematically showing this twin belt type continuous casting machine. In this continuous casting machine,
Molten metal in a tundish 1 is supplied from a nozzle 2 to a casting space. This casting space is formed by forming a short-side mold 5 on both sides of the gap between a pair of belts 4 made of heat-resistant material such as steel that run around a pulley 3.
(See Fig. 5). The molten metal poured into this casting space is cooled by the cooling box 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 5, molten metal will enter there and cause flash. Therefore, it is necessary to press the belt 4 against the short side mold 5. The present inventors have developed a structure as shown in FIG. 5 as a holding mechanism for the short-side mold 5 (Japanese Patent Laid-Open No. 61-99541). In this device, a pair of short side molds 5 are arranged movably along the width direction of the belt 4, and in addition to short side press blocks 8 on both sides of the cooling box 6, short side press blocks are also provided inside the cooling box 6. Block 9 is placed. This short side presser block 9 can move forward and backward with respect to the belt 4 by transmitting the driving force of the extrusion device 11 through the rod 10. By providing a plurality of such short side holding blocks 9 in the width direction of the cooling box 6, the casting width of the metal ribbon 7 to be manufactured can be changed.

That is, when manufacturing the metal ribbon 7 with the maximum width, the outer short side presser block 8 partitions both sides of the casting space. At this time, cooling water is supplied throughout the gap between the belt 4 and the cooling canister 6. When manufacturing a thin metal strip 7 with a small width, the short side mold 5 is moved, for example, to the position shown by the dashed line in FIG. A casting space is formed by this. Then, cooling water is supplied between the belt 4 and the cooling box 6 which are located inside the short side presser block 9 in the width direction of the belt 4, and the supply of cooling water to the gap outside the cooling box 6 is stopped. A plurality of ribs 12 are provided on the surface of the cooling canister 6 facing the belt 4, which prevents the belt 4 from coming too close to the cooling canister 6 due to the static pressure of the molten metal. , to ensure a predetermined cooling water flow path.

By making the short side presser block 9 movable in this way, the thin metal strip 7 having the required width can be
can be manufactured using the same continuous casting equipment.

Furthermore, when the metal ribbon 7 is being cast, the part of the front surface of the belt 4 that comes into contact with the molten metal receives a large heat flux, so the temperature of the belt 4 itself is lower in the center than in other parts. It gets expensive. the result,
It is known that the belt 4 undergoes thermal expansion in the central portion, causing deformation of the belt 4. An effective way to prevent this deformation is to make the entire surface of the belt 4 a uniform temperature. For example, Utsukai Showa 59-58550
In the publication, both ends of the belt 4 in the width direction are heated,
It is suggested that the temperature be the same as the center. However, no method has been proposed so far to separate the cooling section and the heating section according to the change in the casting width of the manufactured metal ribbon 7.

(Problem to be Solved by the Invention) In this way, when the pair of short-side molds 5 are made movable in the width direction of the belt 4, the position of the short-side molds 5 is accurately grasped and It is necessary to move the holding block 9 back and forth and change the separation between the refrigerant and the heating medium. Therefore, the work becomes troublesome. Also, the short side presser block 9
The forward and backward movements are also performed by a separate drive device, so
The device itself is complicated, and since the belt and the presser block slide, there is a problem with the durability of the presser block.

Therefore, the present invention provides a twin-belt type continuous metal ribbon casting machine in which the short side mold is movable and the casting width can be changed. The purpose is to improve the adhesion between the belt and the belt, equalize the temperature of the belt, and suppress thermal deformation of the belt.

(Means for Solving the Problem) The present invention comprises a pair of belts that are placed opposite each other with their operating surfaces spaced apart by a predetermined distance, and a pair of short belts that are installed in a position variable in the width direction between the pair of belts. In a twin-belt continuous metal ribbon casting machine with a variable casting width, which produces a metal ribbon by injecting molten metal into a pool formed by a side mold and cooling and solidifying the molten metal, the above-mentioned pair of On the back side of the belt, along the width direction, there is a medium flow path that brings the cooling medium into contact with the casting area and the heating medium into the short side mold movement area on both sides of the belt, and the discharge side. A cooling box having a throttle mechanism for increasing static pressure and forming a plurality of medium supply/discharge channels is disposed in the cooling box, and a plurality of supply branch channels are connected to the supply side of the medium supply/discharge channels of this cooling box. A supply piston header is provided which separates and forms an internal space for supplying a cooling medium connected to a cooling medium supply source by a piston and an internal space for supplying a heating medium connected to a heating medium supply source. , having a plurality of discharge branch passages connected to the discharge side of the medium supply/discharge passage of the cooling box, and an internal space for cooling medium discharge connected to the cooling medium discharge pipe by a piston, and connected to the heating medium discharge pipe. A discharge piston header is disposed to separate and form an internal space for discharging the heating medium, and the throttle mechanism and the piston are driven synchronously with a drive mechanism that moves the pair of short side molds in the belt width direction. The throttle mechanism of the medium flow path corresponding to the position of the pair of short-side molds is operated to increase the static pressure of the medium flow path, thereby tightening the belt at the corresponding portion. The belt is placed in close contact with the pair of short side molds, the belt in the casting area located between the pair of short side molds is cooled, and the belt side end side of the non-casting area located outside the pair of short side molds is heated. hand,
It is characterized by suppressing belt deformation by equalizing the temperature of the belt.

(Operations/Examples) Hereinafter, the functions of the present invention will be specifically explained using examples with reference to the drawings.

FIG. 1 is a plan view showing a short side mold, a cooling medium (cooling water) static pressure increasing mechanism, and a cooling water and heating medium supply/discharge system in the present invention, and FIG. 2 is a side view thereof. Although the short-side molds and the supply/discharge systems for their cooling and heating media are arranged approximately symmetrically in the belt width direction, one side is shown here for convenience.

In FIG. 1, a pair of short-side molds 5 are placed between a pair of belts 4 by an actuator 13.
The pair of belts 4 are disposed so as to be movable in the width direction on the operating surface side (the side that contacts the molten metal) of the belt 4.
A puddle of molten metal is formed by this.

By moving the pair of short-side molds 5 in the width direction of the belt 4 and changing their positions, the casting width of the metal ribbon can be changed.

On the other hand, in the rear view of the belt 4, it is divided along the width direction, and a cooling medium (cooling water is used in this example, hereinafter referred to as "cooling water") is applied to the casting area of the belt 4. A medium flow path 1 in which a heating medium (steam in this example) is brought into contact with the non-casting areas on both end sides of the belt 4.
9, and a cooling canister 6 having a static pressure increasing throttle mechanism (throttle valve) 20 on its discharge side and forming a plurality of cooling water or heating medium supply/discharge channels is disposed.

Near the cooling water or heating medium supply side of this cooling box, an internal space for supplying cooling water connected to a cooling water supply source and an internal space for supplying heating medium connected to a heating medium supply source are provided by a piston 16a. A supply piston header 16 is provided which forms a supply piston header 16.

This supply piston header 16 has a plurality of supply branch passages 17 and 25 connected to the supply side of the cooling water or heating medium supply/discharge passage in its longitudinal direction.
is provided.

Piston 16a of supply piston header 16
is an actuator 13 that moves the short side mold 5 in the width direction of the belt 4 via the control device 34;
The supply piston header 16 is moved by an actuator 33 driven synchronously with the supply piston header 16 and changes its position in accordance with the change in the position of the pair of short side molds 5.
The plurality of supply branch paths 17 and 25 are divided into an internal space side for cooling water supply and an internal space side for supplying a heating medium, and from the supply branch path 17 on the internal space side for cooling water supply, cooling Cooling water from a water supply source is applied between the pair of short side molds 5 on the back side of the belt 4,
That is, the cooling water is supplied to the cooling water supply/discharge passage located in the casting area to cool the area. Further, from the supply branch path 25 on the side of the internal space for heating medium supply, the heating medium from the heating medium supply source is supplied to the non-casting area (short side Mold movement region) The heating medium is supplied to the corresponding heating medium supply/discharge channels on both end sides to heat the region.

Further, near the discharge side of the cooling water or heating medium supply/discharge passage in the cooling enclosure 6, an internal space for cooling water discharge connected to a cooling water discharge pipe and a heating medium discharge pipe are connected by an actuator 33a. A discharge piston header 22 is provided which forms an internal space for discharging the heating medium.

The discharge piston header 22 is provided with a plurality of discharge branch passages 21 and 6 connected to the discharge side of the cooling water supply/discharge passage in its longitudinal direction.

The piston 22 of this discharge piston header 22
a is an actuator 13 as a drive device for moving the pair of short side molds 5 in the width direction of the belt 4 via a control device 34, and an actuator as a drive mechanism for driving the piston 16a of the supply piston header 16. This corresponds to the position of the piston 16a of the supply piston header 16, which is moved by an actuator 33a as a driving device that is driven synchronously with the supply piston header 33, and changes its position in response to the change in the position of the pair of short-side molds 5. Then, by changing its position, the plurality of discharge branch passages 21 and 26 of the discharge piston header 22 are divided into an inner space side for cooling water discharge and an inner space side for heating medium discharge, and the above-mentioned cooling water supply and The cooling water from the exhaust channel is discharged from the discharge branch passage 21 to the outside of the system via the discharge pipe through the internal space for discharging the cooling water.

Further, the heating medium from the heating medium supply/discharge passage is discharged from the discharge branch passage 26 to the outside of the system via the discharge pipe via the internal space for discharging the heating medium.

Note that in this case, the discharge of cooling water and the discharge of heating medium in the discharge piston header are performed separately by controlling the pressure (flow rate and flow rate) settings for supplying and discharging the cooling water and heating medium. There is a need,
This is because the discharge piston header 22 and the supply piston header 16 are interlocked, so if the cooling water and heating medium are mixed and discharged at the discharge piston header, this control becomes impossible.

The flow rate of the cooling water flowing through the medium flow path 19 is
A predetermined flow rate is given by the nozzle 18 on the inlet side of the medium flow path so as to obtain the necessary heat removal from the molten metal, and the pressure control valve 15 and the outlet pressure are It is controlled by valve 23. On the other hand, the medium flow path 19 corresponding to the position of the short side mold converts a part of the cooling water flow velocity into pressure energy by throttling the throttle valve 20 provided on the discharge side to increase the static pressure, thereby increasing the static pressure of the belt 4. It is crimped onto the short side mold 5.

The high pressure side flow path and the low pressure side flow path are separated by a flow path seal 28.

The throttle valve 20 is connected to an eccentric cam 29 via a lever 30.
It is in contact with the cam and opens and closes as the cam rotates. The eccentric cams 29 are sequentially shifted by an angle Θ=360/n, which is calculated by dividing 360 degrees by the number n of passages required to change the width. The throttle valve 20 is sequentially opened and closed. This camshaft 31 is connected to a drive mechanism 32 that is synchronously interlocked via an actuator 13 and a control device 34 that move the pair of short-side molds 5 in the belt width direction. Depending on the position of the short side mold 5, the rotation angle required for operating the throttle valve on the discharge side of the medium flow path 19 corresponding to this position is given.

As shown in FIG. 2, the medium flow path 19 is arranged in a plurality of stages in the casting direction (vertical direction in this case), and supports the molten metal by dispersing the increased static pressure.

The heating medium is supplied and discharged by the heating medium pressure control valves 27 and 24, the supply piston header 16, the supply branch passage 25, the medium flow passage 19, the discharge branch passage 26, and the discharge piston in the same manner as the cooling water supply and discharge. This is done via the header 22 and the heating medium pressure control valve 27.

When the pressure of the heating medium is increased, the belt 4 is deflected in a direction that reduces the casting thickness. Therefore, as shown in Fig. 3, which shows an enlarged view of the vicinity of the casting space, the short side mold 5
A sliding protrusion 5 is provided on the short side mold support member 5a that supports the
It is effective to prevent the belt 4 from being bent by forming a groove c and rubbing it against the surface of the belt 4. Note that by supplying lubricant to the sliding projection 5c via the lubricating pipe 5b, the sliding projection 5c can smoothly slide on the belt 4. It is also effective to attach a sealing material 6a to the tip of the outer plate of the cooling enclosure 6 on the belt 4 side to prevent the heating medium from blowing out from the end surface of the belt 4.

In this way, in the present invention, in a twin-belt continuous casting machine in which the casting width of metal ribbon is variable, a pair of short-side molds are moved in the belt width direction to change the position in order to change the casting width. When changing the belt, a plurality of independent media supply/discharge channels are formed along the width direction on the back side of the belt, and these media supply/discharge channels are synchronized with the movement of the pair of short-side molds in the belt width direction. cooling water supply/discharge passages that automatically cool the central part of the belt located in the casting area between the pair of short-side molds, and heating that heats both end sides of the belt located in the non-casting area. By clearly dividing the belt into a medium supply/discharge path, cooling the belt casting area and heating the non-casting area, the temperature difference between the casting area and the non-casting area of the belt is reduced.
This suppresses thermal deformation of the belt.

In the present invention, the static pressure of the cooling water in the medium flow path corresponding to the position of the pair of short side molds is automatically increased in synchronization with the movement of the pair of short side molds in the belt width direction. In this way, the adhesion between the belt and the short side mold in this area can be easily and appropriately ensured.

(Effects of the Invention) As explained above, in the present invention, in response to the movement of the pair of short side molds in the belt width direction,
By moving the pistons synchronously, the belt's multiple medium supply/discharge channels formed in the width direction are divided into cooling water supply/discharge channels and heating medium supply/discharge channels, cooling the casting area of the belt. The non-casting area is heated to reduce the temperature difference between the casting area and the non-casting area of the belt, thereby sufficiently suppressing thermal deformation of the belt, and at the same time reducing the belt width of the pair of short side molds. By activating the throttle mechanism in synchronization with the movement in the direction and increasing the static pressure in the medium flow path corresponding to the position of the pair of short-side molds, the short-side molds and the belt at the corresponding position are brought into appropriate close contact. Since the properties can be easily and stably ensured, high-quality metal ribbons can be stably produced.

In addition, in the present invention, deterioration of the belt can be suppressed, and in order to bring the belt into close contact with the short side mold, there is no need to remove worn parts as in the case of using a conventional presser block that slides on the back surface of the belt. Therefore, it is possible to reduce the equipment cost, and it is possible to obtain effects such as ensuring high productivity.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a short-side mold and a drive mechanism in an embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is an enlarged view of the vicinity of the casting space in another embodiment, and FIG. The figure schematically shows a twin-belt type continuous casting machine, and FIG. 5 shows a short-side mold holding block corresponding to a conventional movable short-side mold. 1...Date delivery, 2...Nozzle, 3...
...Pulley, 4...Belt, 5...Short side mold, 5a
...Short side mold support member, 5b...Lubrication piping, 5c
...Sliding projection, 6...Cooling box, 6a...Sealing material, 7...Metal ribbon, 8, 9...Short side presser block, 10...Rod, 11...Extrusion device, 12
... Rib, 13 ... Actuator, 14 ... Support frame, 15 ... Pressure control valve, 16 ... Supply piston header, 16a ... Piston, 17 ...
... Supply branch path, 18 ... Nozzle, 19 ... Medium flow path, 20 ... Throttle valve, 21 ... Discharge branch path, 22
... Discharge piston header, 22a ... Piston, 23 ... Outlet side pressure valve, 24 ... Pressure control valve for heating medium, 25 ... Supply branch path, 26 ... Discharge branch path, 27 ... For heating medium Pressure control valve, 28...
Channel seal, 29... Eccentric cam, 30... Lever, 31... Camshaft, 32... Drive mechanism, 33,
33a... Actuator, 34... Control device.

Claims (1)

[Scope of Claims] 1. By a pair of belts that are placed opposite each other with their operating surfaces separated by a predetermined distance, and a pair of short-side molds that are placed between the pair of belts so that their positions can be varied in the width direction. In a twin-belt continuous metal ribbon casting machine with variable casting width, which produces metal ribbon by injecting molten metal into the formed pool and cooling and solidifying it, on the back side of the pair of belts. Along the width direction, there is a medium flow path that brings the cooling medium into contact with the casting area, and a heating medium in the short side mold movement area on both ends of the belt, and a restrictor for increasing static pressure on the discharge side. A cooling box having a mechanism and forming a plurality of medium supply/discharge channels is provided, and a plurality of supply branch channels are connected to the supply side of the medium supply/discharge channels of this cooling box, and the piston A supply piston header is disposed to separate and form an internal space for supplying a cooling medium connected to a cooling medium supply source and an internal space for supplying a heating medium connected to a heating medium supply source, and It has a plurality of discharge branch paths connected to the discharge side of the supply/discharge channel, and has an internal space for cooling medium discharge connected to a cooling medium discharge pipe by a piston, and an interior space for discharging a heating medium connected to a heating medium discharge pipe. A discharge piston header is provided that separates the space from the discharge piston header, and a control device is provided to drive the throttle mechanism and the piston in synchronization with a drive mechanism that moves the pair of short-side molds in the belt width direction. The throttle mechanism of the medium flow path corresponding to the position of the pair of short-side molds is operated to increase the static pressure of the medium flow path, and the belt in the corresponding portion is moved to the position of the pair of short-side molds. cooling the belt in the casting region located between the pair of short-side molds, heating the belt side end side of the non-casting region located outside the pair of short-side molds,
A twin-belt continuous metal ribbon casting machine that suppresses belt deformation by equalizing the temperature of the belt.