JPS5921451A - Continuous casting device - Google Patents

Abstract

PURPOSE:To provide a titled device which permits easy regulation of a charging speed and a production speed of a plate, prevents the inclusion of impurities and by which a casting having good quality is obtd. by providing a feed tank which contacts with vertical type belts or twin drums via fire-resistant antifriction materials. CONSTITUTION:Annular belts 5 in tight contact with the contact surfaces of fire-resistant antifriction materials 8 of graphite or the like in an arc-shaped section provided in the upper part of a feed tank 6 are put on drums 1, 2 which are cooled with water or the like from the inside, in a vertical belt type continuous casting device. The drums 1, 2, 3 are rotated in arrow directions under application of tension on the drums with the drums 3 by springs 4, thereby rotating the belts endlessly in the arrow directions. When molten metal is charged into the tank 6 through a charging port 7, the solidification takes place from the part of the metal 6 in contact with the belts 5. The solidified metal is sandwiched and moved upward by the belts 5 and is removed as a thin sheet 10. The free surface of the molten metal is eliminated and the inclusion of impurities is prevented by the above-mentioned constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical belt type or twin drum type continuous casting apparatus, and particularly to an apparatus suitable as a continuous thin plate casting apparatus.

Continuous metal casting is a process in which molten metal is cast into a mold, shaped into a plate, and then pulled out, and the cast plate is used as a rolling material or cut and used for cutting the casting. It is being done.

In continuous casting of 1f rolling material, the solidification rate increases when the thickness of the slab is made as thin as possible, so it is possible to reduce the rolling process up to the product sheet without significantly reducing productivity (manufactured weight per rolling time). There is a trend toward thinner cast slabs because it can reduce the amount of work required.

Continuous thin plate casting equipment can be roughly divided into the Drano method and the belt method, and there is also a method that combines the two methods.

The drum method includes a twin drum L casting method as shown in FIG. 1 and a drum dipping method as shown in FIG. Typical belt systems include a vertical type as shown in FIG. 3 and an inclined type as shown in FIG.

These conventional devices will be briefly described.

In the twin-drum earth casting force type shown in Fig. 1, the drum 1 is cooled from the inside and rotates in the direction of the arrow. Hot water stored in a hot water storage tank 2 is cast between the drums through a nozzle 4, and the portion that cools and solidifies in contact with the drum becomes a plate 6 and continuously comes out from below. 5 is unsolidified hot water that is layered four times on drums and plates.

In the immersion type shown in FIG. 2, 1 is a drum and 2 is a hot water storage tank.The drum 1 is immersed in hot water 6 for 1 minute and rotates in the direction of the arrow. The tram is energized from inside, and the metal solidified on the surface becomes a plate 4 and is taken out upwards. Ru. Cooling of the drum - By appropriately adjusting the rotational speed, plates of constant thickness can be obtained continuously. A slick roll 5 may be placed for temporary surface condition and thickness adjustment.

Next, in the vertical belt system shown in FIG. 5, the annular belt 6 wound around the drums 1, 2, and 2 moves in the direction of the arrow as the drums l move. 4 is a hot water storage tank, and hot water 5 is cast between the belts through a nozzle 6. The inside of the drum or the back side of the belt is cooled, and the hot water that has solidified in contact with the belt is taken out in one direction through plates 8 and -7 as the belt moves. This is the unsolidified part of the hot water surrounded by the Bell River and the solidified plate.

In the 41st and 21st belt inclination methods, the annular belt loops wound around drums 1 and 2 move in the direction of the arrow as the drums move.The belts are slightly inclined at 2 with respect to the water 51/. In other respects, the process is the same as that shown in Fig. 5.The solidified plate 8 is taken out one by one along the movement of the belt.
It is 2-ru.

The continuous thin plate casting machines that have been considered in the past or have been put into practical use to some extent are as described above, but these machines have some disadvantages and technical difficulties. (There are two difficulties that prevent large-scale industrialization.

First of all, there are five problems with the method shown in Figure 1.3.4: the main and the 171st order, and it is difficult to solve the technical problem.

(1) Because it is necessary to bring the casting nozzle close to the mold, the nozzle must be thin in order to balance the solidification rate, and the shape and material are extremely difficult.

(2) Because it is a thin plate, the solidification rate is high.111
Impurities such as oxides on the surface are mixed in, resulting in poor material quality, or is the cast surface not good? 4) It's difficult to do it. Solidification begins the moment the cast metal comes out of the nozzle contacts the mold, so if a free surface that is sufficiently submerged is not obtained, a solidification pattern will occur, causing scattering of solidified molten metal (t, y)%. etc., the casting surface is poor and becomes 1.

(3) It is difficult to adjust the appropriate casting speed and slab removal speed, especially with the twin drum type shown in Figure 1.
Next, in the drum immersion method shown in FIG. 2, there is a technical difficulty different from that described in -1-. That is, 4Fft′ property −F
Is it necessary to increase the rotational speed of the drum?6 (・), but -
When the water is wet, the water surface becomes rippled, and impurities such as oxides are entrained in the part that contacts the drum, and inclusions are formed on the side that contacts the tram, creating a wave pattern. arise. Since the solidified thickness of the saidayu varies in the axial direction of the tram, it is difficult to make a board with the traditional shape of "G1g".

The present invention (71) was made to improve the drawbacks of the conventional thin plate continuous casting apparatus described in 1-.

That is, the present invention provides a vertical belt-type or twin-drum type continuous casting apparatus, in which a hot water supply tank is provided in contact with the belt or the twin drum, and a portion of the hot water supply tank that comes into contact with the belt or twin drum is provided with reduced fire resistance. This invention relates to a continuous casting apparatus provided with abrasive materials.
explain.

Figures 5 and 6 are diagrams showing an example of an embodiment of the device of the present invention. Figure 5 shows the device of the present invention applied to a belt-type bottom casting method, and Figure 6 shows an example of the top casting method. This is an example of application.

First, in FIG. 5, 1 and 2 are annular metal healds 5.
The drum 3 around which the belt 5 is wound is a drum mounted so as to be pushed outward by a spring 4 in order to apply the necessary tension to the belt 5. These drums 1 to 3 rotate 2 in the directions of the arrows marked on them, thereby causing the belt 5 to move in an endless orbit in the direction of the arrows. Any one of these drums 1 to 3 may be used as the driving force for driving, or another drum not shown in this figure may be used. 1.Ra l, 1.2 is filled with water, oil or molten salt. In some cases, one of the pipes in 5 is directly cooled. 6 is a hot water tank containing one refractory and -1. Cast the metal from below through the suriiri 1"7. Invasion "1no is a long slit shape in the axial direction of I Rano, case 17
(-Therefore, several pieces are provided at ζ in the direction of the axial force.

When the hot water is poured into the hot water tank 6, hot water? touches belt 5 O / 4
A portion of the solidified part begins to solidify and moves upward, and the parts attached to the belts 5 on both sides meet and solidify and adhere to form the plate 10, which moves along the movement of the bells 1 and 5 to the 11 knob. Move (-1
, are taken out continuously.

E・, l'Xl f/i-The bottom of the frying pan not shown is exposed to the atmosphere through 1 and the above person] 1'-5 The closed boiler neck is 4,... or J The height of the hot water level in this frying pan is 13 in a steady state, and the line connecting the centers of the lower drums 1 and 1 is raised, and the solidified plate 10 has a lower blade
The hot water pressure of 1゛ on the drum should be in a state where it acts in the direction of -1 (preferably -1~. B. There is a risk that outside air will infiltrate into the hot water tank 6 even if it is not enough.

In order to prevent hot water from leaking from between the belt 5 and the hot water tank 6, a constant pressure is applied to the belt 5 (made so that the contact surface of the hot water tank 6 is in close contact with the belt 5). Make sure that they are in contact with each other. In this case, in order to prevent wear and tear on the contact surfaces between the belt 5 and the hot water tank 6, a refractory anti-friction plate 8 made of graphite or the like having an arc-shaped cross section that can be brought into close contact with the belt 5 is attached to the top surface of the hot water tank 6. During operation, the drums 1 to 6 rotate and the belt 5 moves at a considerable speed, so hot water does not leak outward from between the belt 5 and the anti-friction material 8.

Next, in the single casting method shown in Figure 6, most of the
It is the same as the bottom casting method shown in the figure, but the difference from Fig. 5 is that it has a hot water tank 6 at the top, so the hot water flows through the frying pan and the hot water tank 6 as in the case of Fig. 5. The road is a point that is not necessary.

In FIG. 6, the portion that has solidified in contact with the bell 1, 5 is taken out by the movement of the belt 5 between the plate 10 and the belt 5. Not (J
3. Hot water is poured from the hot pot into the hot water tank 6, but the level of the hot water in the hot water tank 6 may fluctuate within an allowable range.
-), as in the belt vertical type shown in Fig. 5, I
It is not necessary to cast at a single speed with a small nozzle.
It is preferable to install a suitable tank wall J5' (not shown) at the end of the tank 1 and 2 to provide No. 11 measures against leakage of hot water.

The above is an explanation of the belt system of the present invention, but the belt 5 shown in Figs. -C can be applied in both pouring and over-casting methods.

Below-1-Explanation [2 Notes] According to the device of the present invention, technical problems that are difficult and vague with conventional devices can be solved.

In other words, (1) the thin nozzle needed to adjust the casting speed in order to bring it closer to the mold is unstable; (2) the melt with a free surface is unstable except at the moment when the casting starts. After casting, it disappears and prevents impurities from being mixed in.
There is no occurrence of wave patterns on the plate due to the free surface of the plate, and castings with good quality and surface condition can be obtained.
3) Since the flow of hot water in the hot water tank is designed to be large enough for the production speed of the plate, fluctuations in the free surface of the hot water are allowed within a considerable range, so that the flow from the frying pan to the hot water tank Adjustment of the relationship between the casting metal speed and the plate manufacturing speed can be performed within a considerable range and is technically easy.

[Brief explanation of the drawing]

1 to 4 are views showing a conventional thin plate continuous casting apparatus, and FIGS. 5 to 6 are views showing an embodiment of the apparatus of the present invention. Sub-agents 1) Meifuku agent Ryo Hagiwara -

Claims (1)

[Claims] In a vertical belt-type or twin-drum continuous casting machine, a hot water tank is installed in contact with the belt or twin drum, and the part of the hot water tank that comes into contact with the belt or twin drum is provided with a fire-resistant anti-friction coating. Continuous casting equipment.