JPS61123451A - Continuous casting device of strip consisting of metal and particularly steel - Google Patents

Abstract

PURPOSE:To prevent the deterioration of a cast strip by exerting pressure on a molten metal in a partially closed molten metal reserving tank and disposing cooled guide bodies and endless belt-like bodies. CONSTITUTION:The molten metal reserving tank 1 communicates with a pressure chamber 4 and the controllable pressure is exerted on the molten metal 2. A casting mold 3 is constituted of the upper and lower endless bodies 6, the upper and lower guide bodies 10 and a driving device for said bodies. The molten metal 2 on which the pressure higher than atmospheric pressure is exerted is extruded into the mold 3 by passing through a space outlet 5 between upper and lower nozzle plates 5a and 5b. The respective bodies 10 are cooled by the internal cooling water and move at the same speed as the moving speed of the cast strip 9. The bodies 6 do not adhere to the strip 9 and prevent the oscillation of the mold 3. The molten metal 3 is substantially supplied to the mold 3 by the above-mentioned method and therefore the deterioration of the quality of the cast strip is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Application The present invention allows molten metal under pressure to be transported from a sump tank into a mold according to the principle of a communicating tube.

The present invention relates to an apparatus for continuous strip casting of molten metal, especially molten steel.

This type of equipment involves the controlled introduction of molten metal from a sump tank and sprue into a stationary (non-vibrating) continuous casting mold, and the controlled withdrawal of the continuous casting into a continuous casting mold. This is carried out by moving one heat-resistant endless strip in each case on at least one side of the casting at the withdrawal speed of the continuous casting.

The development of new technologies for the production of cast strips is based on the physical-technical possibility of producing rolled strips from raw materials with a minimum number of rolling steps of at least t3 times, which are more than the material properties required for rolled strips. For example, a slab casting line (consisting of a front line, an intermediate line, and a finishing line) for slabs (for example, about 200 to 300 mm thick), which is an old-fashioned line, has more than 30 rolling cycles. By the way, the rolling number of production lines for shaped pipes, seamless pipes, and thick plates is currently within the range of 3 to 1O. Reducing the number of rolling steps from 30 or more to t-3 or more means that a part of the casting line can be omitted, which leads to a significant reduction in the production cost of the strip.

Conventional technology Conventionally, as a device for producing strips by continuous casting,
A hand-type or roller-type moving mold is used, and molten steel is injected into the moving mold by gravity.

Problems to be Solved by the Invention By the way, the width of the gap in the mold described above is very narrow, and the supply of molten steel to the mold is carried out by the action of gravity, so the molten steel cannot be sufficiently supplied to the mold. Therefore, there was a problem that the quality of the cast product deteriorated.

The object of the invention is therefore to avoid the difficulties that arise during continuous strip casting, namely the insufficient supply of molten steel to the very narrow gap molds.

Means for Solving the Problems In order to solve the above problems, the continuous metal, especially steel, strip casting apparatus of the present invention is characterized in that the molten metal under pressure can be transported from the molten metal tank to the mold according to the principle of a communicating pipe. , molten metal,
Apparatus, in particular for the continuous casting of molten steel strips, in which the molten metal (2) is placed in an at least partially closed smelt tank (1) under elevated pressure. )
The upper region of the endless strip (6) can be introduced through a gap outlet (5) provided with a closed t cast section (7) on at least one side (3a) of the endless strip (6).
can be introduced at the casting speed into the respective casting side stroke, and the endless strip (6) and the casting strip (9) can be cooled for the endless strip (6) or the casting strip (9). It is constructed so that it rests on the guide body αq.

Effect: According to the above configuration, the molten metal is sufficiently supplied into the mold by pressure, which has a positive effect on the quality of the cast strip.

Furthermore, it is possible to maintain a predetermined withdrawal speed, since it allows a precise placement of the metal mass, possibly with air exclusion. The pressure also serves to adjust the degree of densification of the cast strip to the cooled guide body. Furthermore, endless strips do not require special vibration equipment. In addition, the endless strip serves to transfer heat to the cooled guide body.

An advantageous embodiment of the invention consists in that the gap outlet consists of an overflow section arranged in a horizontal plane on the guide and a cooling roller that can be driven in the direction of movement of the casting strip.

The problem posed is further solved as follows. That is, at increased pressure, the molten metal in the upper closed smelting tank is introduced vertically through the gap outlet into the plate continuous casting mold, with the slit inlet and the cooled plate continuous casting mold being introduced vertically into the plate continuous casting mold. At least two opposite width sides between the foils are introduced into the respective casting side strokes at casting speed. In addition to accurate metering, improved cast strip thickness and advantageous heat dissipation, this
The configuration allows arc-shaped casting of thin casting strips, which means that the casting undergoes only very small deformations during the subsequent winding process.

A further improvement of the invention consists in that the endless strip is passed between the overflow part and the cooled guide body. Its advantages lie in avoiding vibrations, maximizing casting speed and unhindered heat transfer into the mold plate.

Another invention proposes that a pressure chamber is arranged adjacent to the sump tank for the molten metal, which is connected to the sump tank through an opening in the bottom region of the partition.

A further improvement of the invention consists in that at least one cooling roller, which is adjusted or adjustable to the casting strip thickness, is provided in the overflow part as part of the mold. This cooling roller is provided corresponding to the surface of the casting strip opposite to the endless strip, and its position can be adjusted in the thickness direction of the casting strip. In addition, in order to reduce the shrinkage of the casting strip, another cooling roller is placed after the cooling roller in the direction of movement of the casting strip, and an endless strip is wrapped around these cooling rollers. It is advantageous that the cooling rollers of the casting strip can be adjusted by being rotatably driven at the casting strip speed.The advantage of such an arrangement consists in the possibility of adjusting the cooling rollers, which do not have to be arranged at the same height in the front-to-back arrangement. .

The lateral limits for the cast strip can advantageously be reached in that the ends of the cooling rollers are each provided with seven plungers at a distance of the width of the cast strip.

Another advantage of the invention is that the pressure chamber belonging to the distillation tank receives an inert gas, thereby avoiding reoxidation of the molten metal that occurs during casting.

Example An embodiment of the present invention will be described below based on the drawings.

The apparatus for continuous casting of strips according to FIG. 1 comprises a molten metal tank (1) from which molten metal (2) (liquid steel) is transported into a mold (3). The molten metal (2) is discharged from the pressure chamber (4) with controllable pressure (dp/dt). As shown in Fig. 1, the molten water tank (1) communicates with the pressure chamber (4), and is formed by an upper nozzle plate (5a) and a lower nozzle plate (5b), and has one horizontal gap. It is equipped with an exit (5). The mold (3) is provided to the upper nozzle plate (5a) K of the gap outlet (5) of the bait.
6), a lower endless strip (hereinafter simply referred to as the lower strip) (6), and an upper and lower guide body α□QCI that guides the gap between the two strips (6) (6) to a predetermined thickness. and a t-th drive device (t) that moves each guide QO forward from the slit entrance between these guides QOQQ and each nozzle plate (5a) (5b) at the same speed as the moving speed of the casting strip plate (9). (not shown). Note that the width of the cast strip (9) is determined by the width of the wall (not shown) (for example, the side wall (8a) in FIG. 3).
) (8b) is more restricted than K. Each of the above guides QQ
are cooled by, for example, cooling water passing through them, and heat (dQ /
dt) I am trying to steal lc. The strip (6) can be made of various materials, such as aluminum or steel. Further, the strip (6) may be made of a material having high thermal conductivity, for example, a ceramic foil having a thickness of 0.1 tm. Further, as the material of the band-shaped body (6), glass fiber cylinder, carbon fleece, and Quisca foil made of C single crystal can be considered. Of course, a mixture of the above-mentioned materials can also be used for this strip (6). The above materials are resistant to temperature changes and have relatively high thermal conductivity. In addition, the strip (6) may be made of the above-mentioned material and thinly pasted onto a metal strip main body. In this case, the strip body does not come into direct contact with the molten metal (2) or the outer solidified portion of the casting strip (9), thus preventing adhesion to the casting strip. The strip (6) serves to feed the molten metal (2) into the mold (3) without vibrating the mold (3). The problem of bringing a molten metal (2) with a temperature of about 1500°C (molten steel) into a narrow mold (3) is in this case a high pressure N (4) compared to atmospheric pressure.
by means of a gap outlet (5) in communication with the pressure within.

According to the second embodiment (Figs. 2 and 3), one gap outlet (
5) is formed from an overflow part (b), and the mold (3) is formed by a lower strip body (6), a lower guide body αq, and a cooling roller α4 arranged horizontally above these.
It is composed of. The cooling roller μs is made rotatable and is supported so as to be adjustable in the direction of the arrow Q4 in order to adjust the thickness of the casting strip 1. Therefore, here the gap outlet (5) is connected to the cooled lower guide member. The Ql or lower strip (6) will be formed together with the cooling roller (2). Note that the overflow part (2) acts like a pre-dispensing portion of the molten metal flow. Cooling begins at the gap outlet (5) where the cooling roller (2) is cooled like the guide body (10).

According to another embodiment (FIG. 4), the gap outlet (5) is applied when the casting strip moves vertically (dm/dt). In this case, the mold (3) is a continuous casting mold (hereinafter referred to as a front and rear plate continuous casting mold) facing the gap outlet (5).

(referred to as a plate mold) (an example of a guide body) (to), and an endless strip (6) that moves from top to bottom on the surface of these plate molds (g) (to) at a casting speed CVg)
(6) and.

These belt-shaped bodies (6) (6) are composed of upper and lower drive rollers (to) QQ that move them. Note that a slit inlet αG for guiding the strip (6) (6) is formed between the gap outlet (5) and each plate mold (to) (to). Furthermore, each of the plate molds (g) is made of copper and is cooled. Additionally, each band (6) is released through t-*(dQ/dt)
is mainly taken out from the cooling device αη.

In addition, in all cases, the molten metal (2) is
The pressure chamber (
4).

The invention can be implemented in other variants.

That is, in the embodiment according to FIG. 2, after the cooling roller (2), another cooling roller (to) is connected to the casting strip moving force.

Direction (9a) K:! a cooling roller, an endless strip (6) being wrapped around the cooling roller.

One of the cooling rollers (2) is then driven at the casting speed Vg. The casting speed Vg must be equal to the casting strip speed.

The friend lateral limit of the cast strip (9) is the side wall (8a) (8
b) In addition to (Fig. 3), the flange can be adjusted to the width of the casting strip! ! It can also be formed by @ (Fig. 3). Other endless strips (6) with guides similar to those described for column 1.2.4 can also be used. Such an example becomes clear from FIG. The lateral endless bands are shown here at (6a) and (6b).

FIG. 4 includes another embodiment. Hot water tank (
1) t; 1: Here, the molten metal (2) extends to the gap outlet (5) and (left half of the figure) rapidly passes through the separation 1Ik (Foundation) to the casting section (7) without a temperature drop. where it is also rapidly cooled. An alternative to this is the right half of FIG. 4, in which the storage tank (1) leads the molten metal (2) through a vertical wall section 4 to the casting section (7).

The invention and preferred embodiments will now be described.

A molten metal under pressure that can be transported from a molten tank to a mold according to the principle of a communicating pipe.

Apparatus, in particular for the continuous casting of molten steel strips, in which the molten metal (2) is placed in an at least partially closed smelt tank (1) under elevated pressure. )
It is possible to introduce through the gap outlet (5) provided in the upper region of at least one side (3a)f of the closed casting section (7), with an endless strip (6) on each casting side. The endless strip (6) and the cast strip (9) can be introduced at casting speed into the stroke of the endless strip (6) or the cooled guide body (for the cast strip (9)). 10) An apparatus for continuous casting of metal, in particular steel, strips, characterized in that it rests on the metal, in particular steel, strip casting apparatus.

B0 gap exit (5) is 1c above the horizontal plane (2) of the guide body
The device according to item A above, characterized in that it is formed by an overflow part (b) arranged and a cooling roller (to) which can be guided in the direction of movement of the casting strip.

The molten metal under C0 pressure can be transported from the storage tank to the mold according to the principle of a communicating pipe. Apparatus for continuous strip casting of molten metal, especially molten steel, in which the molten metal (2) is placed in a sump tank (1) closed at the top under elevated pressure
is introduced vertically into the plate continuous casting mold (G) through the gap outlet (5), and is cooled at the slit entrance αG and at least two opposite width sides of the plate continuous casting mold αO, Device characterized in that an endless strip (6) can be introduced into each casting side stroke at the casting speed.

D. The apparatus according to item A or B above, characterized in that the endless strip (6) is cooled with an overflow part (b) and guided through the darkness of the nine guiding body.

E. A pressure chamber (4) is arranged adjacent to the molten metal tank (1) for the molten metal (2), which passes through the barrier in the bottom area of the bulkhead (2) to the molten metal tank (1). The device according to any one of the above items A to D, characterized in that it is connected to a tank (1).

F. Overflow part Ql) K Item A above, characterized in that at least one cooling roller (2) adjusted or adjustable to the casting strip thickness is assigned as a mold (3), The device according to any of Items B and D.

G. At least one cooling roller (to) is arranged in the casting strip movement direction (9a) after the cooling roller (to), and the endless strip (6) is wrapped around the cooling roller (4). The above F, characterized in that at least one of the cooling rollers can be driven to rotate at the speed of the casting strip.
Equipment described in Section.

The ends of the H0 cooling roller have flanges of 1M (to) tm spaced apart by the width of the casting strip. The apparatus according to any one of the above features A to G.

(2) The device according to any one of items A to H above, characterized in that the pressure chamber (4) belonging to the hot water tank (1) receives an inert gas.

Effects of the Invention According to the above configuration of the present invention, the molten metal in the thirst tank is pushed out under pressure from the gap outlet toward the mold, so unlike the conventional supply by gravity, the molten metal is sufficiently supplied into the mold. Therefore, deterioration in the quality of the cast strip can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a cross section of an embodiment of the present invention. Fig. 2 is a perspective view showing a cross section of another example of the underlayment, and Fig. 3 is a perspective view showing the cross section of another example.
FIG. 84 is a front view, FIG. 84 is a perspective view showing a cross section of still another embodiment, and FIG. 5 is a v-v arrow view of FIG. (1) ... craving tank, (2) - ... molten metal, (3
)...Mold, (4)...Pressure chamber, (5)...Gap outlet, (5a)...Upper nozzle plate. (5b)...lower nozzle plate, (6)...endless strip, (7)...cast cross section, (9)...cast strip plate, αq
... Guide agent Yoshihiro Morimoto Figure 1

Claims (1)

[Claims] 1. A device for continuous strip casting of molten metal, in particular molten steel, in which the molten metal under pressure can be transported from the molten metal tank to the mold according to the principle of a communicating pipe, which at least that the molten metal (2) present in the partially closed sump tank (1) can be introduced through a gap outlet (5) provided in the upper region of the sump tank (1); The fact that at least one side (3a) of the closed casting section (7) allows the endless strip (6) to be introduced into the respective casting side stroke at the casting speed, the endless strip (6) and the casting strip ( Apparatus for continuous casting of metal, in particular steel, strips, characterized in that 9) rests on a cooled guide body (10) for the endless strip (6) or for the cast strip (9).