JPS6039461B2 - Method for producing quenched metal ribbon - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a rapidly cooled metal ribbon, and in particular, the present invention relates to a method for producing a rapidly cooled metal ribbon, in which molten metal is continuously supplied onto a moving cooling surface through a nozzle with an elongated exit cross section, and rapidly cooled and solidified. The present invention relates to a method for manufacturing a wide quenched metal ribbon.

Conventionally, the method for manufacturing rapidly cooled metal ribbons with a width of several ribs and a thickness of about one skin has been to use a pair of cooling rolls whose bag lines are parallel to each other and which rotate in opposite directions and are spaced apart from each other, as shown in Figure 1. ,1'
The molten metal 3 received in the container 2 is passed through the nozzle 4 into the biting part of the nozzle 4.
The twin roll method involves supplying the molten metal 3 from the tip of the nozzle 4, rapidly cooling and solidifying it to produce the quenched metal ribbon 5, or as shown in FIG. A single roll method is employed in which the rapidly cooled metal ribbon 5 is produced by supplying, rapidly cooling, and solidifying the metal ribbon.

In FIGS. 1 and 2, 6 is the molten metal flow flowing out from the outlet of the nozzle 4, and z represents the distance between the nozzle outlet and the point where the molten metal flow contacts the rotating outer peripheral surface of the roll. Conventionally, in order to produce a wide quenched metal ribbon, a nozzle having a nozzle outlet with an elongated cross-section, such as a rectangular or elliptical slit, has been used. FIG. 3 is a front view of such a nozzle 4, and FIGS. 4 and 5 are slits each having an elongated rectangular or elliptical cross section when the nozzle 4 in FIG. 3 is cut along line nn. FIG. In Figs. 3 to 5, xi represents the distance between both ends 7, 7 in the longitudinal direction of the slit (hereinafter the longitudinal direction is referred to as the x direction), and yi represents the distance in the longitudinal direction of the slit (hereinafter the direction perpendicular to the longitudinal direction is referred to as the x direction). (referred to as the y direction) side view 8
, 8. By the way, when the inner surface of the slit of the nozzle is formed as a plane parallel to the flow direction of the molten metal, the molten metal flow 6 is shown in the perspective view in FIG. 6, the front view in FIG. 7, and the side view in FIG. 8. As shown in each figure, the shape of the flow changes between leaving the slit and contacting the roll. That is, the molten metal flow 6 gradually contracts in the x direction, while gradually expanding in the y direction. Therefore, even if a nozzle with a large slit x and a small yi is used to produce a wide quenched metal ribbon, the molten metal flow 6 is deformed before reaching the roll surface, shrinking in the x direction, and shrinking in the y direction. Since the slit becomes swollen and rare, it has the disadvantage that it is much shorter than the xi of the slit, and only a thin metal strip of width can be obtained. To eliminate this drawback, if the x-direction of the slit is made longer than a predetermined length, it becomes difficult to manufacture the nozzle, and if the y-direction is made shorter than the predetermined gap, the nozzle may become clogged due to cooling of the molten metal. This made it difficult to manufacture thin strips. The purpose of the present invention is to provide a method for producing a rapidly solidified metal ribbon having a wide range of width, the longest length, and a good surface quality, which eliminates and improves the drawbacks of conventional methods. The above objective can be achieved by providing: That is, the first aspect of the present invention is to continuously supply molten metal from a nozzle onto a cooling surface and rapidly cool it.
In the method for producing a rapidly solidified metal ribbon: the nozzle outlet has an elongated rectangular or flat elliptical cross section; nozzles are provided on the inner surface of both ends of the nozzle in a direction parallel to the longitudinal direction of the nozzle outlet cross section; a taper reaching the outlet tip and gradually expanding outwardly on both sides in the longitudinal direction; and a taper at the nozzle outlet.
and the flow direction of the molten metal at the outlet perpendicular to the cross section of the nozzle exit is 45 degrees or less; The second aspect of the invention is the above/
The nozzle outlet has an elongated rectangular or flat elliptical cross section; the inner surface of both ends of the nozzle parallel to the longitudinal direction of the exit cross section of the nozzle reaches up to the nozzle outlet tip, and extends to both outer sides in the longitudinal direction. a gradually enlarged taper; on both inner surfaces of the nozzle facing each other along a direction parallel to the longitudinal direction of the nozzle outlet cross section, each reaching the nozzle outlet tip; and a distance between the two inner surfaces of the nozzle; and the angle between the taper at the nozzle outlet and the flow direction of the molten metal at the outlet perpendicular to the cross section of the nozzle outlet is 450 or less; The present invention relates to a method for manufacturing a wide quenched metal ribbon characterized by the following. Next, the present invention will be explained in detail.

As mentioned above, the molten metal flowing out from the slit of the conventional nozzle, which has an elongated cross-sectional shape, flows into the sixth,
7 or 8, it contracts in the x direction, while the y
It contracts in the x direction while expanding in the y direction.

In Fig. 7, considering the molten metal flow 6 between the distance 1 from when the molten metal flow exits the slit to the point where the contraction in the x direction ends, the molten metal flow 6 reaches Vi at the slit part of the nozzle.
As soon as the molten metal leaves the slit, the molten metal flow 6 is subjected to an acceleration of V7x due to surface tension, that is, a velocity vector of V7x, in the x direction and toward the east center of the molten metal flow. Also, as shown in FIG. 8, it similarly receives a velocity vector V7y in the y direction. As a result, the molten metal flow 6 has Vx in the x and y directions,
It moves with a velocity vector Vy, and the sixth
, 7 or 8. The inventors have proposed that the velocity vector V↑x toward the center of the molten metal flow east along the x direction caused by the surface tension of the upper molten metal flow will be canceled, that is, the molten metal flow will contract along the x direction. In order to suppress this force, as shown in FIG. 9, a taper ( Length x in the x direction at the taper start position of the slit; Length x in the x direction at the outermost tapered end position of the slit.

By causing the molten metal to flow out from the nozzle 4 provided with a large taper, the molten metal flow 6 flowing out of both ends of the slit in the x direction of the nozzle 4 is made to have a velocity vector Vix directed outwards in the x direction. As a result, the force that tends to cause the molten metal flow 6 to contract in the x direction of the slit is suppressed, so the distance 1 that the molten metal flow 6 travels after being ejected from the nozzle until the contraction ends can be extended.
Since there is a part where the length of the molten metal flow 6 in the x direction is larger than the length of the slit in the x direction, when the molten metal flow is brought into contact with the cooling surface of the roll at that part, the molten metal that comes into contact with the roll will The length of the metal flow in the x direction can be increased, i.e. the length x of the slit in the x direction. Wider width strips can be produced. On the other hand, the slit y of the nozzle
In the direction as well, as shown in Fig. 10, the inner surfaces of the slits facing each other along the x direction are tapered so as to gradually narrow the slit in the y direction toward the nozzle outlet (the y A taper is provided in which the length y in the y direction at the outermost end of the slit taper is smaller than the length yi in the y direction, and the molten metal flow is given a velocity vector V↑y toward the center of the molten metal flux in the y direction. By providing this, it is possible to suppress the force that tends to cause the molten metal flow to expand in the y direction due to surface tension. According to the invention,
Since V^ is much larger than V7y, it is better to provide a taper on the inner side surface of both ends of the slit in the x direction so that the molten metal flow contracts in the x direction and
The effect of suppressing expansion in this direction is large, and the sufficient suppressing effect can be exerted simply by providing such a taper.

However, by further providing a taper near the slit of the nozzle so that both side surfaces of the slit along the x direction are narrowed in the y direction, it is possible to achieve the effect of suppressing the above deformation of the molten metal flow to a greater extent. however,
Simply providing a taper at the nozzle outlet that narrows both side surfaces of the slit along the x direction cannot produce a sufficient suppressing effect. According to the second aspect of the present invention, the slit portion of the nozzle has a taper that widens outwardly in the x direction as it goes toward the exit direction at both ends in the x direction, and a taper that spreads outward on both sides in the x direction as it goes toward the exit direction. By using a nozzle with a taper that narrows in the y direction, it is possible to smoothly spread the molten metal flow to both ends in the x direction within the nozzle. According to the present invention, it is desirable that the angle a formed between the taper provided at both ends of the nozzle slit in the x direction and the flow direction of the molten metal is 450 or less at the slit portion.

No effect is observed when 8 is zero degrees, but an effect is observed when there is a slight angle, and the effect becomes greater as 8 becomes larger.

However, if the angle is larger than 450, turbulence will occur in the molten metal flow and the effect will be lost.The best effect can be achieved when the angle 8 is within the range of 100 to 300. According to the present invention, the angle formed by the taper in the y direction provided on both sides of the nozzle slit in the x direction and the flow direction of the molten metal is desirably 450 or less in the nozzle slit portion.

As described above, as long as the taper angle a of the slit section provided at the end in the x direction is not zero degrees, even if the angle is zero degrees, the effect of suppressing the deformation of the molten metal flow is exhibited.
However, the inventors of the present invention have newly discovered that by forming this taper corner, the function of the taper corner can be promoted. On the other hand, if the angle of one corner of the taper is larger than 450, the molten metal will not flow smoothly in the nozzle slit, and the above-mentioned suppressing effect will not be achieved.
The best effect can be obtained when the temperature is in the range of o to 20o. Also, the method of providing the taper at each position is the 11th.
, 12, it is desirable that the slit inner surface shape is such that turbulence does not occur in the molten metal flowing through the nozzle slit. Next, the present invention will be explained with reference to examples.

Example 1 The slit of the nozzle has a rectangular shape of 2 × 3 Q side, and the taper of the slit in the x direction is 15 degrees at one corner, and the taper in the y direction is 00 degrees at one corner. 40 which are parallel and in contact with each other and rotate at 60pm
Si melted to 150 picoC in the biting part of the enemy's twin rolls.
When silicon steel containing 6.5% was injected through the nozzle, 5 kg of continuous quenched ribbon with a width of 45mm and a thickness of 150mm could be produced.

On the other hand, the slit of the nozzle is a 2 x 3 rectangular shape.One corner of the taper in the x direction is oo, and the one corner of the taper in the y direction is oo.
When a ribbon was produced using a nozzle made of the same material as the nozzle described above and under the same conditions as described above, the width was 25 and the thickness was 15.
Only a thin strip with a narrow width of 0 mm could be obtained.

Example 2 The slit of the nozzle has a rectangular shape of 2 x 3 squares, one corner 8 of the taper in the x direction of the slit is 20 degrees, and one corner of the taper in the y direction is 10 degrees. When a thin strip was produced under the same conditions as in Example 1, it was possible to produce a continuous thin strip with a width of 55 feet and a thickness of 150 feet.

As described above, according to the present invention, it is possible to continuously produce a continuous quenched metal ribbon having a wider width than that by conventional methods.

Note that the nozzle used in the present invention can be used not only for manufacturing quenched metal ribbons, but also for manufacturing thick metal plates. It can also be used when it is necessary to suppress the contraction of the fluid in the x direction when it flows out from the slit and falls or flies in the air to form a band-shaped fluid.

[Brief explanation of the drawing]

Figure 1 is twin. Longitudinal cross-sectional view of the apparatus for producing a thin metal ribbon by the roll method, No. 2
The figure is a longitudinal cross-sectional view of a manufacturing device for rapidly solidified metal strips using the single roll method. Figure 3 is a longitudinal cross-sectional view of a nozzle for flotation of molten metal equipped with an elongated slit. Figures 4 and 5 are the slits of the nozzle in Figure 3. FIG. 6 is a cross-sectional view taken along the line nn of the slit portion of the nozzle, which is rectangular and oval, respectively; FIG. Figure 7 is an elevational view of the nozzle and molten metal flow shown in Figure 6 viewed from the y direction, Figure 8 is an elevational view of the nozzle and molten metal flow shown in Figure 6 viewed from the x direction, and Figure 9 is an elevational view of the nozzle and molten metal flow shown in Figure 6 viewed from the x direction. , 10 are elevation views corresponding to FIGS. 7 and 8, respectively, when the nozzle according to the present invention is used, and FIGS. 11 and 12 show the taper in the x and y directions of the slit portion of the nozzle according to the present invention. FIG. 1,1'...Roll, 2...
・Container, 3... Molten metal, 4... Nozzle, 5... Quenched metal ribbon, 6... Molten metal flow, 7... Both ends of the slit in the x direction; 8. ．．・．．
．．・Both sides of the slit in the y direction. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12

Claims (1)

[Scope of Claims] 1. In a method for manufacturing a quenched metal ribbon in which molten metal is continuously supplied from a nozzle onto a moving cooling surface, quenched and solidified: the nozzle outlet has an elongated rectangular or flat elliptical cross section. having a taper on the inner surface of both ends of the nozzle in a direction parallel to the longitudinal direction of the nozzle exit cross section, reaching the nozzle exit tip and gradually expanding to both outsides in the longitudinal direction; and The angle between the taper at the outlet and the flow direction of the molten metal at the outlet perpendicular to the nozzle outlet cross section is 45° or less;
A method for producing a wide quenched metal ribbon, characterized by using a nozzle. 2. In a method for producing a quenched metal ribbon in which molten metal is continuously supplied from a nozzle onto a moving cooling surface, quenched and solidified: the nozzle outlet has an elongated rectangular or flat elliptical cross section; The inner surfaces of both ends of the nozzle, which are parallel to the longitudinal direction of the outlet cross section, are provided with tapers that reach the nozzle outlet tip and gradually expand toward both outer sides in the longitudinal direction; in a direction parallel to the longitudinal direction of the nozzle outlet cross section. On both inner sides of the nozzle facing along the
each reaching a nozzle outlet tip and comprising a taper in which the distance between the two inner surfaces of the nozzle gradually narrows; and the taper at the nozzle outlet and the flow direction of the molten metal at the outlet perpendicular to the nozzle outlet cross section; The angle formed is 45° or less; a method for producing a wide rapidly quenched metal ribbon, characterized by using a nozzle.