JPS6038224B2 - Method and apparatus for producing wide thin strips directly from molten metal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for producing a wide thin strip directly from molten metal.

Conventionally, a wide range of thin strips or thin plates of metal materials have been manufactured through traditional methods such as melting, ingot formation, competitive anchoring, hot rolling, intermediate phosphorous annealing, and cross rolling.
For example, it is manufactured through processes such as melting, continuous casting, instant hammering, and cold rolling. However, traditional methods not only have complicated processes, but also have the disadvantages of high equipment costs, a huge amount of energy used per unit weight of the metal strip manufactured, and poor finishing yield. On the other hand, the continuous casting method is rapidly becoming popular because it can shorten the process of the conventional method and significantly reduce energy consumption, but it requires a large amount of equipment and requires precision work. It has drawbacks such as requiring control and skill. By the way, various methods for manufacturing metal fibers from molten metal have also been proposed.

These methods involve ejecting molten metal from a circular nozzle).
, a means of cooling the fluid with gas [1], a means of cooling it in a liquid (2), or a means of cooling it by attaching it to a metal surface.Metal fibers are manufactured using glue, and are used in each method. However, the viscosity of molten metal is generally low, and it is industrially difficult to continuously produce metal fibers with good dimensional accuracy by the methods of '1} and [2], and {3} method is considered the most promising. The method of '31 is basically based on the first, second and third methods.
It can be classified into three types a, b, and c as shown in the figure.

Method a rotates a cylinder 102 having an inclined inner wall surface 101 as shown in FIG. This is a method in which the metal fibers 104 are deposited, cooled, solidified, and then released outside the cylinder. In method b, as shown in FIG. 2, molten metal is ejected and sprayed from a nozzle 203 onto the outer circumference of the disk 202, cooled and solidified on the outer circumference of the disk 202, and metal fibers 204 are continuously released. It's a method. As shown in Fig. 3, in method c, molten metal is jetted from a nozzle 303 at the contact portion of two rollers 301 and 302 that rotate in parallel with each other, and is cooled and solidified by being sandwiched between the two rollers and continuously molten metal. metal fiber 3 below
This is a method of releasing 04. Now, the method [3] above is a method that aims to produce metal fibers by jetting molten metal in a thin linear stream from an extremely small nozzle hole with a circular cross section at the tip.Methods a and b , c, metal fibers with maximum widths of 2 sides, 5 ribs, and 5 sides are manufactured, respectively, and for reasons described later, it is not possible to manufacture a wide thin strip plate wider than the above width, and it is not possible to manufacture a wider thin strip plate. Not only had there been no idea of manufacturing boards in this manner, but there had also been no attempt.

The present invention provides a method for manufacturing a wide thin strip plate, which eliminates the drawbacks of conventional methods and continuous casting methods known or practiced in the past, and improves the method for manufacturing metal fibers, as well as an apparatus therefor. 1. In a method for manufacturing a wide thin strip by jetting molten metal from a jet nozzle onto the surface of a rotating roller and rapidly cooling it, the cross section of the tip of the jet nozzle is and the angle between the jetting direction of the molten metal onto the roller surface and the tangent to the roller at the point where the molten metal collides with the roller surface is more than 600 and less than 800. 1. A method for producing a wide thin strip directly from molten metal, characterized in that:

2 Equipped with a molten metal spouting nozzle whose cross section is formed into a wide slit, and a rotating roller disposed close to the spouting nozzle for rapidly discharging the molten metal, and the spouting nozzle has a central steel wire and a molten metal. The angle formed by the tangent line of the roller at the point where it flows down on the outer circumference of the roller is more than 60o and 80o
Producing a wide thin strip directly from molten metal, characterized in that the cross section of the tip of the nozzle is set within the following range and extends in a direction perpendicular to the direction of travel of the roller surface. Related to equipment.

Next, the present invention will be explained in detail.

According to the method of the present invention, as shown in FIG. 4, a slit having a desired width in cross section at the tip is formed on the roller 1 which is rotating molten metal, and the longitudinal direction of the slit is aligned with the rotational axis direction of the roller 1. When the molten metal is jetted down from the spouts/spools 3 arranged in parallel, it cools and solidifies on the roller 1 to become a thin strip 4, and the temperature decreases along the outer peripheral surface of the roller 1). Between circumferential angles.

When the temperature further decreases, the strip plate 4 rotates together with the roller 1.
is peeled off from the outer circumferential surface of the roller 1 due to contraction and is swung away from the roller 1 by centrifugal force. Thereafter, both sides of the strip 4 are cooled with air, for example, to produce a wide thin strip. Next, the apparatus of the present invention will be explained.

As shown in FIG. 4, the apparatus of the present invention is composed of a roller 1 and a nozzle 3 arranged close to the roller.

The roller 1 has the function of cooling, solidifying, and turning the molten metal jetted down from the nozzle 3 onto its outer peripheral surface into a thin strip.
In the apparatus of the present invention, the material of the rollers can be different from the type of metal used to make the thin strip, and when manufacturing a soft metal strip with a low melting point, a steel roller is used instead of a hard metal with a high melting point. When producing the strips, rollers made of tool steel or surface-treated steel, for example, can advantageously be used.

In the apparatus of the present invention, in order to enhance the cooling function of the molten metal by the roller 1, one or more cooling rollers 5 can be provided in parallel with the roller as shown in FIG. By doing this, the heat transferred from the molten metal to the roller 1 by conduction is not only radiated from the roller 1 to the atmosphere, but also transferred to the cooling roller 5, and the temperature rise of the roller 1 is more effectively suppressed. This is advantageous in that the useful life of the roller 1 can be extended and the molten metal can be cooled and solidified more quickly. Next, the nozzle used in the present invention will be explained.

In the research of the present invention, the width of the metal tape manufactured using a nozzle with a circular cross-sectional shape does not expand to more than twice the nozzle diameter, and the reason for this is that the width of the metal tape on the roller is I learned that this is because the molten metal cools and solidifies before it spreads in the axial direction of the loaf.

For this reason, by using a rectangular or elliptical nozzle as shown in Fig. 6A and 6B, a wide plate-shaped liquid flow can be formed before contacting the roller surface. The width of the strip can be made approximately equal to the length in the longitudinal direction of the nozzle cross section or the length in the longitudinal direction. However, the liquid flow ejected from a nozzle with such a nozzle cross-sectional shape aggregates due to the surface tension of the molten metal itself and deforms into a cylindrical shape, so the distance between the nozzle tip and the lobe should be kept as close as possible. It's advantageous. In the present invention, the angle formed by the center axis of the nozzle and the marquee line of the roller at the point where the metal liquid flow contacts the roller.

It has been found that the shape of the strip plate changes depending on the relationship between the rotation distance of the roller and the pm. Next, this will be explained using experimental data. The nozzle hole width was 10, the thickness was 0.5 mm, and the pressure applied to the metal liquid was 0.5 kg/, and the metals used were Ni 78%, B 12%, and Silo% in atomic %.

As shown in Figure 7, there are defective products in which the metal liquid does not form a band (
A good product (indicated by × in the figure), a good product (indicated by △ in the figure) with a band-like shape but with an uneven cross section, and a good product (indicated by a circle in the figure) with a band-like shape and a uniform cross-section are affected by the angle Q, respectively. It can be seen that good products can be manufactured when the angle Q is within the range of more than 60 degrees and less than 80 degrees. However, it is necessary to adopt the optimum value of the square edge depending on the shape of the nozzle, liquid ejection pressure, type of metal, roll material, roll diameter, heating temperature, etc.

In the research of the present invention, the correlation between the width w and thickness t of the cross-section of the ribbon to be manufactured, the rotational speed rpm of the roller, and the thickness T of the nozzle hole was investigated. The alloy used in this study contained atomic percent Ni
The component composition is 78%, B12%, Silo%, and the width W of the nozzle hole is 4 mm.

As shown in FIG. 8, when the thickness T of the nozzle hole is constant, the thickness t of the ribbon decreases rapidly until the roller rotation speed approaches 100 pm, and decreases gradually above that point. On the other hand, the width w of the ribbon gradually decreases around 100 pm or more. In this study, the width of the ribbon is determined by the width of the nozzle hole, but the thickness largely depends on the roll rotation speed and the cross-sectional thickness of the nozzle hole. In addition, as shown in the figure, since all the ribbons produced at temperatures above 500 pm were amorphous, it is thought that the cooling rate was about 1 pm/sec or above. The types of metals that can be used in the present invention include pure metals such as aluminum and copper, alloys such as duralumin, bronze, brass, copper, and stainless steel, as well as semi-alloys such as carbon, phosphorus, shelf elements, and silicon. iron, cobalt or nickel alloys containing metals;
Amorphous alloys can be easily manufactured using alloys that can be made amorphous, such as Nb-Ni alloys and Cu-Zr alloys.

According to the present invention, one of the major features of the present invention is that a metal material having the following properties can be easily made into a wide thin strip plate.

1. Hard and brittle metal materials for which it is impossible or difficult to adopt the usual manufacturing method, that is, the method of melting, agglomeration, and processing, such as Fe-A, Fe-Cr, and F.
e-Si et al.

2 Metal materials that require a sharpening effect, such as amorphous metal materials, supersaturated solid metal materials, ultrafine structure metal materials, etc.

Next, the present invention will be explained with reference to examples.

Example 1 A wide thin ribbon plate of amorphous ferromagnetic metal, which has recently attracted particular attention, was manufactured according to the present invention.

The manufacturing conditions at this time were that the roller was made of monkey steel, and the roller width was 5 m.
Roller diameter: 30m, Roller rotation speed: 300pm, Nozzle cross-sectional shape, Vertical: 45 winds, Fuji: 0.5 ribs, Pressure for ejecting argon gas from the nozzle: 1.5k9/ground, Distance between nozzle tip and roller surface 5 fence, corner Q60o, manufacturing alloy component composition atomic%: Fe5%, Co70%, Si15%, BIO%
It was hot. When the produced alloy was examined by X-ray diffraction, it was found that there were no sharp diffraction peaks and only a few broad halos were observed, indicating that the alloy was amorphous.

The magnetic properties and hardness of the produced thin strip of the alloy having a thickness of about 30 mm and a width of 45 mm were as shown in Table 1 below.

As can be seen from Table 1, the ribbon had excellent high magnetic permeability.

Example 2 Using the same equipment as in Example 1, the following second
High-carbon, high-chromium steel and high-carbon nickel-chromium steel with compositions suitable for tool steel shown in the table were made into ribbons.

This thin strip has a thickness of about 30 mm, a width of about 3 mm, and a temperature of about 1 degree Celsius/se.
Due to the quenching effect of c, ultrafine carbides with a diameter of approximately 200A form austenite, and a structure is obtained in which ultrafine carbides with a diameter of about 200A are uniformly dispersed in the ferrite matrix, and the dispersion hardening of these carbides makes it hard and strong as shown in Table 2. It was found to have excellent mechanical properties. Example 3 A gobalt-based alloy (composition of 79% Co, 12% Sj, and 9% B in atomic percent) was placed in a quartz tube vortex, and a molten body made by high-frequency concessional heating was passed through a jet nozzle to a roll with a diameter of 8 mm. Spraying onto a roll with a width of 25 mm, roll rotation speed, nozzle slit width, angle Q
Table 3 shows the results of examining the thickness of the ribbon produced by changing the width and the surface roughness Ra of the free surface of the produced ribbon that did not come into contact with the roll.

Table 3 As is clear from Table 3, since angle Q=900, angle Q=8
00 to 610 has a better surface organization Ra (1) of the free surface of the ribbon that does not come into contact with the roll.

The degree of surface organization of this free surface is also related to the rotational speed of the roll and the temperature at the time of spouting the molten metal, but if the molten metal is immediately blown into the side space at an angle Q = 900 at the moment it comes into contact with the rotating roll. The reason why the surface roughness is large is that the free surface of the ribbon becomes rough due to the air resistance colliding with the free surface of the ribbon, making it impossible to obtain a ribbon with a smooth surface. As described above, according to the method and apparatus of the present invention, it is possible to directly produce a wide thin strip from molten metal, and depending on the type of metal and alloy used, the thin strip has unique properties that could not be obtained by conventional methods. can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of one known manufacturing method of metal fibers, FIG. 2 is an explanatory diagram of another known manufacturing method of metal fibers, and FIG. 3 is an explanatory diagram of yet another known manufacturing method of metal fibers. FIG. 4 is an explanatory diagram showing a situation in which the metal liquid ejected from the nozzle according to the present invention is cooled, solidified, and discharged by a roller, FIG. 5 is an explanatory diagram showing another embodiment of the apparatus of the present invention, and FIG. 6 A. The mouth is a diagram showing the cross-sectional shape of the nozzle tip hole of the present invention, and No. 7.
The figure shows the angle Q between the nozzle center axis and the tangent to the roller at the point where the metal fluid contacts the roller, and the rotational speed r of the roller.
Figure 8 shows the relationship between the width w and thickness t of the cross-section of the ribbon to be manufactured, the rotation speed of the roller, and the thickness T of the nozzle hole. be. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1. In a method for manufacturing a wide thin strip by jetting molten metal from a jet nozzle onto the surface of a rotating roller and rapidly cooling it, the cross section of the tip of the jet nozzle is directed in the traveling direction of the roller surface. and the angle between the direction in which the molten metal is ejected onto the roller surface and the tangent to the roller at the point where the molten metal collides with the roller surface is 60°. A method for directly manufacturing a wide thin ribbon plate from molten metal, characterized in that the angle is within the range of more than 80 degrees. 2 Equipped with a molten metal ejection nozzle whose cross section is formed into a wide slit, and a rotating roller for rapidly cooling the molten metal disposed close to the ejection nozzle, and the ejection nozzle has a center axis that is aligned with the molten metal of the roller. The angle formed by the tangent line of the roller at the point where it flows down on the outer circumference exceeds 60° and 80°
The cross section of the tip of the nozzle extends in a direction perpendicular to the direction of travel of the roller surface. Equipment to manufacture.