JPS62248556A - Production of composite material - Google Patents

Abstract

PURPOSE:To obtain a composite material having an optional shape and ratio of thickness by pouring a molten metal from above between a pair of water cooled rotating bodies which are in proximity to each other and of which the peripheral faces facing each other rotate downward, inserting a core material into the molten metal at the same instant, solidifying the molten metal around the core material and drwing the solidified metal downward. CONSTITUTION:The molten metal 3 and the core material 1 are inserted between the rolls 2 rotating downward and the plate-shaped composite material 4 is taken downward out of the spacing between the rolls 2. A gate to prevent the outflow of the molten metal is provided to the side faces of the two rolls 2 and the two rolls 2 are cooled with water. The core material 1 may be linear or irregular shaped material and the core material 1 and the molten metal may be of the materials to be used for ordinary composite materials. The concentrical composite material is also produced by using the grooved rolls 9 having a semi-circular groove 5 on the surface of the rolls 2 in contact with the molten metal 3 and inserting the core material into the center of the grooves 5. The parts except the grooves 5 of the rolls 9 are coated to form heat insulating layers 6 to weak the cooling in said parts so that the solidified shells are formed only in the groove parts in this case.

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a method for manufacturing composite materials from molten metal, and in particular to a method for manufacturing composite materials from molten metal, and in particular for manufacturing composite materials of any shape and thickness with little formation of an intermetallic compound layer that deteriorates workability at the interface. The present invention relates to a method for manufacturing a composite material having a thickness ratio (thickness ratio between a core material and a coating metal).

BACKGROUND ART As a method for obtaining a plate-shaped composite material, there is a cladding method in which plate materials are rolled and pressure bonded together.

As a method for obtaining a linear composite material, there is a common method in which a core wire is inserted into a pipe to form a composite material, and then plastic processing such as wire drawing is performed on the composite material. Alternatively, there is a method in which a metal tape is continuously attached vertically around the core wire, the joints are welded, and then rolling or wire drawing is performed. Furthermore, a method of sintering and adhering powder such as AFi powder around a steel wire and then drawing the wire, and a method of extruding and covering the core wire with a covering material have also been put into practical use.

Further, as a method using molten metal, there is a plating method in which a core wire is immersed in molten metal and then pulled up. Further, as an improvement to this plating method, there is a short-time immersion method in which the core wire is immersed in the molten metal for a short time, and the molten metal is solidified around the core wire due to the cooling ability of the core wire, and then pulled out of the molten metal as it is.

The above method for manufacturing composite materials has the following problems.

(1) The cladding method can only composite metals that can be rolled, and in addition, large rolling blades are required to obtain wide and thick composite materials, so a large rolling mill is required.
The equipment costs would be enormous.

(2) In the common method, the length of the composite material that can be obtained is limited, and the manufacturing of the pipe and the installation of the core material are time-consuming.

(3) In the method of longitudinally attaching the tape to the core wire and then welding and rolling the tape, there is a limit to the thickness of the tape, so it is difficult to manufacture a composite material with an arbitrary wall thickness ratio.

(4) The method of sintering the powder around the core wire has a high cost for using the powder and the manufacturing speed is slow, and the extrusion coating method requires a high investment cost in manufacturing equipment.

(5) Plating methods cannot produce composite wires with large coating thicknesses. Furthermore, an intermetallic compound is formed at the interface between the core wire and the plating layer, making subsequent wire drawing processing difficult.

(6) The short-time immersion method allows thick plating, and since the contact time between the core wire and the molten metal is short, it has the advantage of reducing the formation of intermetallic compounds at the interface, but the surface of the plating layer has the disadvantage that the surface condition is not necessarily good because it becomes a free solidifying surface of the molten metal.

In particular, as shown in FIG. 4, a pair of rolls 2 partially immersed in molten metal are used in a type of short-time immersion method, and the core wire 1 is pulled upward together with the molten metal 3 from below the rolls 2. There is a manufacturing method.

In this case, if the center of the roll shaft 10 is immersed in the liquid surface of the molten metal, the bearings attached to the roll shaft 10 will be wetted by the molten metal, making it impossible to drive stably for a long time.

Therefore, when the liquid level is lowered, there is a space 11 between the roll and the molten metal liquid level.
Since the molten metal cannot be filled up to the closest point of the roll, the solidified shell formed on the roll surface is exposed to the air before it adheres to the core material, causing the adhesive surface to oxidize or entrain oxides. In extreme cases, voids may be formed.

<Problems to be Solved by the Invention> The purpose of the present invention is to solve the above-mentioned drawbacks of the prior art, and to produce a shape with an arbitrary thickness ratio (thickness ratio between core material and coating metal) directly from molten metal. It is an object of the present invention to provide a method for manufacturing a composite material that can obtain a composite wire with a high quality.

<Means for Solving the Problems> The present invention provides a method for injecting molten metal from above between a pair of water-cooled rotors close to each other that rotate in a direction such that opposing peripheral surfaces move downward. At the same time, a core material is inserted from above between the pair of water-cooled rotors, and a composite material made of solidified molten metal is passed downward from between the pair of water-cooled rotors around the core material. The present invention provides a method for manufacturing a composite material characterized by drawing.

Here, it is preferable that the pair of water-cooled rotating bodies have grooves on the side surfaces parallel to the rotating shaft.

Further, it is preferable that the portions of the pair of water-cooled rotating bodies other than the groove portions have a heat insulating structure.

Furthermore, when inserting the core material from above between the pair of water-cooled rotating bodies, the core material is supplied through a core material supply nozzle, and the contact distance between the core material and the molten metal is variable. It's good that you did.

The present invention will be explained in detail below using preferred embodiments shown in the drawings.

The pair of water-cooled rotating bodies used in the method of the present invention are so-called twin-mode rolls, and although not limited thereto, the following description will be made using the pair of rolls.

(1) FIG. 1 shows one embodiment of the present invention. FIG. 1 shows a preferred case for manufacturing a plate-shaped composite material,
A molten metal 3 and a core material 1 are put from above between rolls 2 rotating downward, and a composite material 4 is taken out from between the rolls 2 downward. Weirs are provided on the sides of the two rolls to prevent the molten metal from flowing out. (Not shown in the figure) The two rolls are also cooled by water cooling means.

Although the core material 1 is shown as a plate-shaped core material in FIG. 1, it may be linear or irregularly shaped.

The core material 1 and the molten metal may be made of any material that is normally used as a core material or coating material for composite materials.

In the method of the present invention, since the molten metal is injected from above, the contact length of the roll 2 with the molten metal can be long, and therefore the casting speed can be increased. In addition, in a method similar to the present invention, as shown in FIG. 4, the molten metal 3 is
There is a method of supplying molten metal and pulling it upward, but in this case, as mentioned in the prior art and its problems, due to the limitations of the structure, it is not possible to fill the molten metal up to the point closest to the roll. A space 11 is created between the roll and the molten metal surface, which causes various quality problems in the composite material 4.However, in the method of the present invention, the molten metal can be filled up to the closest point of the roll, so that solidification is prevented. There is no oxidation on the shell surface, no inclusion of oxides, and no voids.

(2) In Fig. 2a, a semicircular groove 5 is formed on the side surface of the roll 2 in contact with the molten metal 3 to form a grooved roll 9, and a core material 1 is placed in the center of the groove 5 to form a concentric composite. 1 shows a cross-sectional view of an apparatus for manufacturing wire. FIG. 2b is a plan view of the molten metal 3 side in FIG. 2a. In this case, the portion of the roll 9 other than the groove 5 is coated with a cross-sectional material and a heat insulating layer 6 is formed.
By doing so, it is preferable to weaken the cooling from this part and prevent the molten metal from solidifying in this part, so that a solidified shell is formed only in the groove part.

The shape of 5 is not limited to a semicircle, but may be a rectangle or any other shape. Preferably, the cross-sectional shape is similar to that of the core material 1.

The roll 9 may be provided with only one piece, but if it is provided with a plurality of pieces, a plurality of composite materials can be manufactured at the same time.

(3) In FIG. 3, a nozzle 7 is provided in the molten metal to limit the contact length between the core material 1 and the molten metal 3. In this case, by changing the relative position of the tip of the nozzle 7 with the roll 2, the contact length between the core material 1 and the molten metal 3 can be changed, and the adhesion between the core material and the metal coating layer, the thickness of the intermetallic compound at the interface, etc. can be controlled. It is also preferable to prevent oxidation of the core material 1 by setting the atmosphere 8 in the nozzle 7 to an inert atmosphere or a reducing atmosphere.

The method of the present invention is not limited to the examples shown in (1) to (3) above.

In addition to a single material such as a plate wire, stranded wire, multiple wires, multiple plates, etc. may be used as the core material 1 at the same time.

The pair of rolls may be singular or plural.

<Example> The present invention will be specifically described below using Examples.

(Example) Using the grooved roll shown in FIGS. 2a and 2b, 2.
Using a 6 amφ steel wire as the core material and coated metal aluminum as the molten metal, the core material was fed from above the grooved roll and pulled out at a line speed of 65 cm/min to determine the thickness of the core material and coated metal. A composite wire rod (an example of the present invention) with a ratio of 1.3 (composite wire diameter/core diameter) was produced.

(Comparative example) Composite material (
Comparative Example) was prepared.

The surface of the present invention example was smoother than that of the comparative example, and there was no oxide entrapped in the coating metal layer.

<Effects of the Invention> According to the method for manufacturing a composite material of the present invention, adhesion with a core material having an arbitrary shape and thickness ratio with less formation of an intermetallic compound layer that deteriorates workability at the interface can be achieved. Composite materials with good properties can be easily obtained.

It is particularly suitable for producing An-coated steel wires, zinc-coated brass wires, and copper-coated steel wires having a composite wire diameter/core diameter of 1.1 to 3.0.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of manufacturing a composite material using a plate material as a core material by the method of the present invention. FIG. 2a shows that, according to the method of the present invention, using a grooved roll,
FIG. 2 is a cross-sectional view showing an example of manufacturing a concentric composite wire using a round wire as a core wire. FIG. 2b is a plan view of the molten metal side of FIG. 2a. FIG. 3 is a sectional view showing an embodiment of the method of the present invention in which core material is supplied via a core material supply nozzle. FIG. 4 is a diagram illustrating a conventional method for manufacturing a composite material. Explanation of symbols 1...core material, 2-roll, 3...molten metal, 4...composite material, 5...groove, 6
- Heat insulation layer, 7- Nozzle, 8- Inert atmosphere, 9- Grooved roll, 10- Roll shaft, 11- Space Patent applicant Hitachi Cable Co., Ltd. Representative Patent attorney Minoru Watanabe Nozomu Watanabe FIG ,3

Claims (4)

[Claims] (1) Molten metal is injected from above between a pair of water-cooled rotors that are close to each other and rotate in a direction such that the opposing peripheral surfaces move downward, and at the same time, between the pair of water-cooled rotors that A method for manufacturing a composite material, which comprises inserting a core material from above into the body, and pulling out the composite material, which is made by solidifying molten metal around the core material, from between the pair of water-cooled rotating bodies downward. . (2) The method for manufacturing a composite material according to claim 1, wherein the pair of water-cooled rotating bodies have grooves on side surfaces parallel to the rotation axis. (3) The method for manufacturing a composite material according to claim 2, wherein a portion of the pair of water-cooled rotating bodies other than the groove portions has a heat insulating structure. (4) When inserting the core material from above between the pair of water-cooled rotating bodies, the core material is supplied through the core material supply nozzle, and the contact distance between the core material and the molten metal is varied. A method for manufacturing a composite material according to any one of claims 1 to 3.