JPH03286Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a continuous casting and rolling apparatus. Conventionally,
Continuous casting, in which molten metal is continuously supplied from a molten metal supply nozzle between a pair of cooling rolls, and the molten metal, such as lead or lead alloy, is cooled and solidified by the pair of rolls to produce a predetermined rolled strip. Although rolling apparatuses are known, generally defective products are produced in which both side edges of a predetermined wide band-shaped thin rolled product have missing portions R in some places, as shown in the first figure.

A continuous casting and rolling machine with a molten metal supply nozzle designed to prevent such chippings has been proposed, but the wide strip-shaped rolled product manufactured using this method has holes inward in the width direction on both sides of the rolled product. extending to 100
It is unavoidable that long wrinkles or streaks of about 150 mm are produced, and the edges on both sides have the disadvantage of being wavy with relatively large amplitudes in the longitudinal direction. The apparatus is as shown in FIGS. 2 to 4. That is, a pair of cooling rolling rolls B, B are disposed above and below with a small gap a, and these rolls B,
At B, a molten metal supply nozzle e having a U-shaped cross section and consisting of a bottom wall C and both side walls D, D having extension walls d, d protruding beyond the bottom wall C is placed at the tip of the bottom wall C. The edge C1 and the extension walls d, d on both sides thereof are placed in contact with each other.

The above configuration is the same as the conventional device, but in order to prevent the formation of defects, two approximately triangular raised portions g, g are provided on both sides of the central axis of the bottom wall C in the width direction. This type is provided with a tapered throttling channel opening h defined by a section. Thus, during the casting, rolling, and forming operation, the molten metal f was separated into a predetermined width by the extension walls d on both sides in front of the bottom wall C, through the throttling channel opening h provided at its center. Within the surface area b of the roll cooling roll B,
After flowing out to the center, it spreads to both sides,
During this time, it is cooled and solidified by rollers, and becomes a band-shaped solidified product with no defects on both side edges of a predetermined width corresponding to the width of the extended walls d and d on both sides. Then, it is rolled to a predetermined thickness by the rotating rollers B, B,
A predetermined strip-shaped molded body F is obtained. However, as shown in Fig. 5, this molded product F tends to have large vertically undulating edges on both sides, and wrinkles with a length of about 100 to 200 mm are produced inward in the width direction. . It is also very difficult to apply tension to this material and make the strips flat, and in some cases cracks may form.
They also have disadvantages such as they often break.

The present invention further improves this and provides a continuous casting and rolling apparatus that can produce a rolled product that has almost no wrinkles, can easily and smoothly remove corrugations with light tension, and can be made into flat strips. A pair of cooling rolling rolls 1, 1 arranged one above the other with a small gap 2, a bottom wall 3, and extension walls 4a, 4a protruding beyond the bottom wall 3. A molten metal supply nozzle N consisting of both side walls 4, 4 is arranged so that the tip edge 3a of the bottom wall 3 and the both side extension walls 4a, 4a are in contact with each other, and a throttle channel opening 5 is formed in the bottom wall 3. In a continuous casting and rolling apparatus, the molten metal f is made to flow out through the throttle channel opening 5 to the surface area 1a of the cooling roll 1 between the both side extension walls 4a, 4a ahead of the bottom wall 3, At least two channel throttle openings 5, 5 are arranged in the bottom wall 3 on both sides of the center line XX of the bottom wall 3.

In FIGS. 6 to 8 showing an example of the implementation of the present invention, the molten metal supply nozzle N is made of metal and has a U-shaped channel shape in cross section, and has a bottom wall 3 and both side walls 4, 4. A heat insulating covering material such as a synthetic resin sheet or film with a U-shaped cross section over the entire length of the inner surface of the
is provided by pasting, coating, etc. on the bottom wall 3 at the front end, as shown below, with triangular raised portions 7, 7, 7, between each of them, as it reaches the tip edge 3a of the bottom wall 3. Two tapered identical throttle channel openings 5, 5 are provided symmetrically, ie at equal positions, on both sides of the width centerline X--X of the bottom wall 3. The triangular protuberances 7, 7, 7 are made by attaching a heat-resistant member made of thick synthetic resin or the like that protrudes above the height of the flowing molten metal to the three surfaces of the bottom wall.
The triangular adhesive member 7 in the middle is attached to the center line X of the bottom wall.
- Align and paste on A pair of left and right throttle channel openings 5, 5 are formed between them.

9 and 10 show other embodiments,
Three throttle channel openings 5, 5, 5 are formed, and the formation of the raised portions 7, 7, 7 is performed by attaching a part of the bottom wall 3 of the nozzle N upward in place of the above-mentioned adhesive member. It is constructed from one piece molded with a raised height.
In the illustrated example, four triangular raised portions 7 are formed to form three tapered throttle channel openings 5, 5, 5 therebetween.

In this case, as shown in the figure, there is one on the center line XX of the bottom wall 3 and one on the left and right sides of it.
Preferably, two throttle channel openings are formed.
Note that the heat insulating covering material 6 has such raised portions 7,
7, 7 are attached to the entire surface of the bottom wall 3. In the above device of the present invention, the molten metal f flowing inside the nozzle N flows from the plurality of throttling channel openings 5, 5 to the extension walls 4a, 4a of the nozzle on both sides.
It flows out into the area 1a of the cooling roll 1 which is regulated between them, and then diffuses into a solidified strip with a predetermined width between the extension walls 4a, 4a, and then it is rolled to obtain a predetermined strip-shaped compact. The molded product has almost no wrinkles on both side edges, is only several tens of millimeters long at most, and has small vertical undulations. Therefore,
In addition, by lightly pulling this, it is possible to easily form a flat strip-shaped molded product without breakage or cracks. The reason for this is not fully understood, but since a plurality of throttle channel openings 5, 5 are arranged on both sides of the center line XX, the extension walls 4a, 4a on both sides
Compared to the conventional proposal in which one throttle channel opening is provided on the center line of the bottom wall, the distance to reach the molten metal is shorter, and the molten metal is not cooled excessively by the time it reaches the extension wall 4a and solidifies. It is also believed that the fact that the molten metal coming out of the plurality of openings 5, 5 diffuses when flowing out, interferes with each other, and disrupts the directionality of the flow is also considered to have a favorable effect. In addition, regardless of whether the plurality of throttling channel openings are an even number or an odd number, it is best to provide them at equal positions on the left and right with respect to the center line XX, as shown in the figure, to ensure a uniform forming strip. It is particularly advantageous to obtain

In this way, according to the present invention, a plurality of throttling passage openings 5, 5 are arranged in the bottom wall 3 of the nozzle N on both sides of the center line X-X, so that the cooling rolling of the molten metal is As a formed strip, there are no defects on both side edges, and there is an effect that waving, wrinkles, etc. are significantly reduced.

[Brief explanation of the drawing]

Figure 1 shows the top view of a part of a product manufactured by conventional equipment.
Fig. 2 is a cutaway side view of another conventional device, Fig. 3 is a top view of its main parts, and Fig. 4 is the same as Fig. 3.
FIG. 5 is a front view of the nozzle seen from the direction of the arrow, FIG. 5 is a slope view of a part of the formed strip, FIG. 6 is a cutaway side view of an example of the present invention, and FIG. 7 is a main part thereof. 8 is a front view of the nozzle seen from the direction indicated by the - line in FIG. 7, FIG. 9 is a top view of another example of the present invention, and FIG. 10 is A-A in FIG. A front view seen from the direction of the line arrow is shown. 1... Roll roll, 2... Gap, 3... Bottom wall,
3a... Bottom wall tip edge, 4... Side wall, 4a... Extension wall, 5, 5... Throttle channel opening, 7... Protrusion.

Claims (1)

[Scope of utility model registration request] A pair of cooling rolling rolls 1, 1 arranged above and below with a small gap 2, a bottom wall 3, and both side walls 4 having extension walls 4a, 4a protruding beyond the bottom wall 3, 4, the tip edge 3a of the bottom wall 3 and its both side extension walls 4a, 4a.
are placed in contact with each other, a throttle channel opening 5 is provided in the bottom wall 3, and the molten metal f is passed through the throttle channel opening 5.
In a continuous casting and rolling apparatus in which the flow is caused to flow into a surface area 1a of a cooling roll 1 between both extension walls 4a, 4a in front of a bottom wall 3, at least two channel throttle openings 5, 5 are provided in the bottom wall 3. is the center line of the bottom wall 3
Continuous casting and rolling equipment arranged on both sides of X.