JPS5829551A - Continuous casting device - Google Patents

Abstract

PURPOSE:To supply molten metal to a mold without oxidation in a belt type continuous casting device having a conventional overflow type charging means and a belt type continuous casting means by providing an enclosure made of refractories for a molten metal well between the charging means and continuous casting means. CONSTITUTION:An enclosure 39 made of refractories for a molten metal well is provided between an overflow type charging means 6 and a belt type continuous casting means having a mold formed of endless conveyor belts 21, 23 provided in two stages, upper and lower, in contact or proximity with the top side surface 47 of the belt of the conveyor 23. Further, a cover 53 for substituting the atmosphere around the charging port 11 and the enclosure 9 with an inert atmosphere with an inert gas from a pipe 55 is provided. Thus the molten metal 7 flowing from the means 6 through a skimmer 12 then through the port 11 and into the enclosure 39 and further into the mold is not oxidized and the ingot contg. extremely few non-metallic inclusions is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous casting apparatus for molten metal, and more particularly, the present invention relates to a belt-type continuous casting apparatus for molten metal.

Conventionally, various methods for continuously casting molten steel, aluminum, copper, or their alloys, and devices used to carry out these methods, have been known, but seven of these methods and devices are defective. A process called continuous casting and the equipment used to carry out the process are also known. FIG. 1 is an explanatory longitudinal cross-sectional view of the device. 1 and 2 in the same figure are endless belts forming fin-shaped upper and lower surfaces, respectively, and guide rolls, ? , lI to move in the direction of the arrow. On the left are the side walls that form both sides of the mold.

Continuous casting equipment using the above-mentioned endless d-belt (hereinafter also referred to as belt-type continuous casting equipment) is conventionally used to produce thin slabs of several sizes or several pieces, and in this case, an overflow pouring method is used. 6 is often used, and when the molten metal 7 is pressurized with gas, the level of the molten metal outside the pressurizing chamber rises 1
The molten metal overflows over the overflow weir, flows down the injection gutter IO, and is directly injected from the injection outlet into the gap between the belts and 2.

However, when casting a thin slab using the above-mentioned method, it is necessary to reduce the cross-sectional dimension of the injection outlet //, and as a result, the molten metal solidifies at the injection outlet //. Conventional continuous casting equipment has the disadvantage that the flow rate of the molten metal cannot be increased to avoid clogging of the one-sided inlet and outlet.

An object of the present invention is to provide a belt-type continuous casting apparatus that eliminates and improves the drawbacks of conventional belt-type continuous casting apparatuses. The above objective can be achieved. That is, the present invention provides a belt-type continuous casting apparatus having a conventional perfusion-type pouring means and a belt-type continuous casting means, in which a refractory enclosure for a molten metal pool is provided between the pouring means and the continuous casting means. The present invention relates to a continuous casting device characterized by:

Next, the present invention will be explained in detail.

FIG. 2(A) is a plan view of an apparatus showing an example of the continuous casting apparatus of the present invention, and FIG. 2(B) is a longitudinal cross-sectional view of FIG. 1(A) taken along the line x-X. . 2/ in the same figure.

3 are upper and lower endless belts, respectively, and the upper belt 2/ is a guide roll 23 and a drive roll 27.
, the lower belt is wound around the guide roll 3/, the drive roll 33, and the tension roll 3k.
/, , 23 move in synchronization with each other in the direction of the arrow.

The roll of the lower belt 23? / , , 7. month 14
A roller table 37 for supporting and conveying the slab is disposed on an extension of the upper surface of the portion wound around the slab.

A tundish refractory enclosure 39 is provided between the overflow type pouring means 6 and the belt type continuous casting means.

FIG. 3 is a perspective view showing a state in which the refractory enclosure 3q for the hot water pool is disposed in almost contact with the lower belt n, and the right end portion of the enclosure 3q on both side walls<// is hollowed out in an arc shape so as to be in contact with or very close to the guide roll 2 of the upper belt conveyor. Also enclosure 3
The bottom part of 7 consists of a bottomed part IIS made of refractory material and a bottomless part,
This bottomless part has guide rolls 3/3 of the lower belt conveyor.
The upper surface guar of the bell (U) wound between the drive roll 33 and the drive roll 33 exists as a pseudo bottom surface. The refractory enclosure for the tundish 1, which is in contact with the right end lI3 of both sides Q%lI/ of 79, and into which the molten metal is injected through the enclosure 3q), the lower side 5/ of the upper bell) 2/, and the upper side lI7 of the lower belt The short sides of the molds are attached in contact with both ends of the belt in the width direction, that is, the short sides, in the gap between the molds and the short sides of the belt. There is.

It is advantageous to provide the left cover 3 in order to make the atmosphere around the spout of the pouring means and the refractory enclosure for the hot water tank an inert gas atmosphere, for example, a nitrogen or argon gas atmosphere. is a pipe! Inert gas can be introduced from rS.

Next, a method for continuously casting molten metal using the apparatus of the present invention will be explained.

The molten metal 7 in the overflow type pouring means 6 passes through the skinmer 7.2, flows from the pouring outlet // into the refractory enclosure 3q for the pool, and further flows to the left of the lower side of the upper belt and the upper side of the lower belt. The cast slab S7 is injected into the gap formed by the mold, cooled and solidified, and is moved by the rotation of the belts L/, . . . , L3, and further conveyed to the roller table 37.

The molten metal injected into the gap is Bell), 2/.

The mold is cooled from both the upper and lower surfaces by nitrogen gas, and is further cooled from both sides by the short sides of the mold g.

As described above, when molten metal is cast using the device of the present invention, there is no need to throttle the pouring outlet of the overflow type pouring means as is provided in conventional devices, so if the pouring device is clogged, the flow rate will be large. The disadvantage of not being able to do this is completely eliminated, and the amount of poured metal can be determined regardless of the casting thickness.

Furthermore, when casting using a conventional continuous casting apparatus having an overflow pouring means and a belt type casting means, the molten metal is oxidized by air and non-metallic inclusions increase, whereas in the apparatus of the present invention, non-metallic inclusions increase. Since the cover 53 that can create an inert atmosphere is provided, clean molten metal can be supplied to the gap, that is, the mold, without oxidizing the molten metal, resulting in slabs with extremely few nonmetallic inclusions. can be obtained.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-section of a conventional continuous casting apparatus consisting of a continuous casting means and an overflow pouring means; Figure 1 (A) is a plan view of the continuous casting apparatus of the present invention; ) is shown in Figure 1 (
) is a vertical sectional view taken along the line X--X of the apparatus according to the present invention, and FIG. 3 is a perspective view of the continuous casting means in the apparatus of the present invention. /2.2... Endless belt, 3. G... Kite 11-ru, S... Mold side wall, B... Conventional overflow pouring means, 7... Molten metal, g... Pressure chamber, R... Overflow weir , 10... Injection gutter, //... Injection outlet, :1/
, 23...Endless Q belt, 23,3/...Kite roll, core, 33...29.3 to drive roll!
;...Tension roll, 37-...Roller table 83q...Refractory enclosure for hot water pool, Ri/-...Refractory enclosure side wall for hot water pool, Ri3...Right end of enclosure; Hiro 7
...Top side of belt 2/, 5/...bottom side of belt 2/, qg...mold short side body, upright...Jig, 33...
Cover, left...gas pipe. Patent applicant: Kawasaki Steel Co., Ltd. Patent attorney Mura “1” Politics (7)

Claims (1)

[Scope of Claims] 1. A continuous casting apparatus having an overflow pouring means and a belt type continuous casting means provided in parallel in upper and lower stages and having molds formed by an endless belt conveyor, A continuous casting device characterized in that a refractory enclosure for a hot water pool is provided between a hot water means and a continuous casting means and in contact with or close to the upper surface of the endless belt conveyor belt. 2. The continuous casting apparatus according to claim 1, further comprising a cover for creating an inert gas atmosphere around the spout of the pouring means and the person-proof enclosure for the hot water bath.