JPH03275267A - Method for continuously producing metal complex material - Google Patents

Abstract

PURPOSE:To make the process control easy by supplying a metal raw material of cold material at gap between a refractory frame mold and a core material while gradually shifting the core material downward, melting this with induction heating and cooling during coming out of lower part. CONSTITUTION:An outer diameter flange part corresponding to inner hole of a graphite ring 5 is formed at end part of the core material 1 and inserted into the ring 5. At the time of supplying electric current to a coil 4 after supplying the metal raw material 2, the metal raw material 2 is melted to develop molten metal part 2a. Under this condition, while shifting the core material 1 downward, the molten metal part is cooled with a water cooling jacket 6. The molten metal part 2a is solidified and made to an outer layer part 26 to obtain a complex material 10. As the refractory frame 3 is formed as funnel- type, the metal raw material 2 can use powder-state or wire-state, too. Charging, melting, cooling and drawing are formed as one continuous process and the process control is made to easy. As the outer layer material is supplied as cold material, an equipment is simple.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a metal-based composite material in which a core material and an outer layer formed outside the core material are made of metals of different compositions.

[Conventional technology]

Casting techniques for producing this type of metal composite material include centrifugal casting and continuous casting overlay. These techniques are mainly employed as a method for manufacturing rolling rolls and other rollers. The centrifugal casting method uses two different compositions.
Inject seeds or more molten metal into a rotating mold,
Since it is a solidification method, there are restrictions on the materials that can be combined.

In other words, an example of metals with significantly different compositions is the combination of cast iron, which has a close eutectic composition, and alloy steel, which has a C value of 0.5% or less.
Due to differences in solidification temperature, differences in specific gravity of the molten metal, etc., defects tend to occur at the joint boundary, making it difficult to obtain the desired composite material.

On the other hand, the continuous casting overlay method is used, for example, in Japanese Patent Application No. 5! J
As disclosed in Japanese Patent No. 19786, a molten metal having a composition different from that of the core material is injected around the core material, and is bonded and solidified, and the core material is repeatedly pulled out and poured to continuously form the core material. Since this method forms a built-up layer around the material, differences in solidification temperature and specific gravity are hardly a problem, and there are far fewer restrictions on the materials to be combined than with centrifugal casting.
It is an effective method.

[Invention or problem to be solved]

According to the continuous casting overlay method, it is possible to manufacture composite materials of different metals, and it is also suitable for manufacturing long materials such as rolling rolls and rollers. However, in the process of pouring the molten metal around the core material, (1) the temperature of the molten metal tends to vary;

(2) There is a temperature difference in the molten metal between the location near the injection port and the location away from the injection port.

(3) The following may be caused by splashes of molten metal or adhesion of molten metal by hitting the surface of the core material, or by the flow of molten metal hitting the core material and causing melting of the core material to increase in some areas. I realized that there was a problem. In other words, in the continuous cast overlay method, the core material and the outer layer are joined by melting the core material surface layer slightly into the outer layer molten metal, so if the molten metal temperature is too low, the core material and the outer layer are bonded together. If the molten metal temperature is too high, the amount of molten +-1 in the core material surface layer will increase, resulting in poor bonding between the core material and the outer layer. Problems arise in that the dimensional balance and outer layer molten metal composition change. To solve this problem, the above (1) and (2)
) must be strictly controlled, and temperature control is difficult. If melting or adhesion occurs on the surface of the core material in (3) above, the adhering portion will not be melted, causing a problem of partial joint failure, and the amount of melting of the core material. If the amount increases in some areas, a problem arises in that the dimensions of the core material and the outer layer become partially non-uniform. This problem cannot necessarily be easily solved by injecting high-temperature molten metal around the core material.

In view of the problems of the double continuous casting overlay method, it is an object of the present invention to realize a manufacturing method that can easily manage the manufacturing process and provide a healthier composite material.

[Means to solve the problem]

This invention supplies a cooling metal material to the gap between the inner surface of the refractory frame and the core material while gradually moving the metal core material from above to below through the refractory frame having a mold formed at its lower end. This is then melted by induction heating and added to the core material.
It is characterized in that the melted metal material is welded to the outside of the core material as an outer layer portion and solidified by cooling while passing through the mold and exiting downward.

The metal material of the cypress wood to be supplied may be in any shape that can be inserted into the gap between the refractory frame and the core material, and specifically, it may be in the form of powder, granules, wire, tape, fiber, or core material. It may be in any pipe-like form that surrounds the pipe, or in any combination thereof.

[For production]

According to the means of the present invention, unlike the conventional continuous casting overlay method, instead of supplying the metal material or molten metal that will become the outer layer, cypress material is supplied and the cypress material is melted in a refractory frame. The points are different. That is, charging, melting, cooling, and drawing are performed continuously. The material of the cypress wood has few restrictions as with the continuous cast overlay method, and only the combination of any core material and metal material for the outer layer can be used, and the melting can be done appropriately by selecting the output of the induction heating coil and the operating frequency. I'm coming. Therefore, there is no need for a step of pouring molten metal, which is difficult to handle.

The cold metal material supplied into the gap between the refractory frame and the core material is melted by induction heating, the outer surface of the core material is poured into it, solidified by cooling, and the outer layer is welded to the core material. Metal composite material is obtained.

In addition, the shape of the metal material for the outer layer is not very limited, so it can be selected from many commercially available materials.

[Example] A first example will be described using FIG. 1. The figure is a schematic longitudinal sectional front view of the manufacturing apparatus showing a state in which the metal composite material 10 is being manufactured. In the figure, l is a core material, 2 is a metal material for forming the outer layer, 3 is a refractory frame, 4 is an induction heating coil, 5 is a graphite link, and 6 is a water cooling jacket.

Core material 1 is Densha (trade name of cast iron rod obtained by continuous casting manufactured by Kobe Cast Iron Co., Ltd.) and has an outer diameter of 2 GO mm.
, has a circular diameter cross section with a length of 4000 mm.

Metal material 2 has a copper-nickel alloy vibe and has an outer diameter of 220 mm.
mm, and 8 mm thick. Table 1 shows the composition (%) of this metal element 2 and core material 1.

Table 1 The refractory frame 3 is formed into a funnel shape, with the two parts 3a contracting downward from above, and the upper part 3a followed by a lower part 3h, which has a cylindrical shape and extends downward. The lower part 31) has an inner diameter of 23 mm, a thickness of 3 mm, and is made of one of the four major alumina materials.

The induction heating coil 4 is connected to the do portion 31 of the refractory frame 3 as shown in the figure.
), with an output of 350 kW and a working frequency of 3000 H7. The output of the coil 4 is determined so that the supplied metal material 2 is melted and heated within a predetermined time, and the surface of the core material 1 is melted.

Note that the output of the coil is appropriately determined depending on the type and form of the metal material;
For 00 to 600 mm, the coil output is 200 to 750
It will be about KW.

The graphite link 5 is formed so as to extend downwardly from the lower part 3b of the refractory frame 3, and serves as a mold for regulating the outer diameter of the composite material 10.

The water cooling jacket 1-6 is formed to surround the outer periphery of the graphite link 5 to cool it, and to have an inner hole portion 6a extending the inner hole of the graphite link 5 downward.

Although not shown, a roller type kite for the core material 1, a supply device for the metal material 2, and a drawing device for the composite material 10 are provided, and the drawing speed can be adjusted.

When manufacturing a composite material from the core material 1 and the metal material 2 using such a device, for example, a flange portion with an outer diameter corresponding to the inner hole of the graphite link 5 is placed near the tip of the core material 1. is formed, and the flange portion thereof is inserted to the position of the graphite link 5, and the metal material 2 is supplied and power is supplied to the coil 4, and the metal material 2 is melted to form a molten metal portion 2a.

In this state, the core material 1 is pulled downward by 0.5 mm using a pulling device.
moved intermittently or continuously at an average speed of /sec,
When the required amount of metal material 2 is supplied, a composite material 10 comes out downward. In the figure, 2b shows the solidified outer layer.

The composite material 1o obtained in this way is a composite continuous rust rod in which a copper-nickel alloy layer is uniformly welded to the outside of a cast iron rod over the remaining entire length excluding the tip and rear end portions, and the core material is It was observed that the surface layer of 1 was slightly dissolved.

A second embodiment will be explained using FIG. 2. The figure is a schematic longitudinal sectional front view of the manufacturing apparatus showing a state in which the metal composite material 20 is being manufactured. This apparatus is substantially the same as that shown in FIG. 1, but differs in that a granular material supply chute 19 is provided since a metal material or granular material is used to form the outer layer.

In the leap, 11 is a core forged steel rod, outer diameter: 18
0mm and length 2.50[]mm. 12 is a granular body of high chromium cast iron, which is a metal material, and has a particle size of 5 to 20.
+++m. Table 2 shows the composition of the metal material 12 and the core material 11.

Table 2 The inner diameter of the lower part 3b of the fireproof frame 3 is 450 mm, and the thickness is 30 mm.
1TIIn, and the induction heating coil 4 has an output of 60
It has a power of 0 KW and a frequency of 5.0 DOR, and the graphite link 5 has an inner diameter of 452 Tnm.

When manufacturing a composite material 20 from a core material 11 and a metal material 12 using this device, the core material 11 is intermittently or continuously pulled out at an average speed of 0.3 mm/sec in the same manner as in the first embodiment. Then, 20 pieces of composite material come out downward. In this case, approximately the required amount of the metal material 12 is applied to the upper part 3a of the refractory frame 3.
When the metal is supplied to the inside, even if it is piled upward, it is sequentially melted from below to become the molten metal part 12a, and then the solidified outer layer part 12
It becomes b.

The composite material 20 obtained in this way was subjected to ultrasonic flaw detection after removing the outer layer portions at the leading and trailing ends.
It was confirmed that there were no defects in the outer layer portion 12b and the welded portion between the core material 11 and the outer layer portion 12b. In addition, this composite material 20
is a roll material.

-] In addition to Embodiment 21, the metal material for forming the outer layer may be supplied in the form of a wire or tape 22 which is unrolled from the wound state, as shown in FIG. Good too. In the figure, 21 is a core material, 22a is a molten metal part, 22
b is the solidified outer layer, 30 is the composite material, and the others are the first
Since it is similar to the figure, the same reference numerals are used.

In the above embodiments, a rod or a tube may be used as the core material.

〔Effect of the invention〕

According to the method of the present invention, a sound metal composite material is obtained in which the outer layer is welded to the outside of the core material. In the method of this invention, charging, melting, cooling, and drawing are all one continuous process, so process control becomes easy. In other words, instead of using a production method in which one part of the outer layer is supplied in a molten metal state as in the conventional casting overlay method, it is supplied as cypress material, so there is no need to create molten metal in a separate furnace, and A4 Since there is no need to inject hot water, there is no need for a metal melting furnace or molten metal transportation equipment.

Additionally, this has the effect of eliminating all problems caused by difficult temperature control of the molten metal, local temperature differences caused by molten metal injection, and problems caused by splashing or adhesion.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a schematic longitudinal sectional front view of the main parts of the manufacturing apparatus used in the first embodiment of the present invention, showing the operating state, and Fig. 2 is the second embodiment of the invention. FIG. 3 is a schematic longitudinal sectional front view of the main parts showing the operating state of the manufacturing device used, and FIG. 3 shows another form of supplying the metal material of cypress wood for the outer layer in the device used in the manufacturing method of the present invention. FIG. 2 is a schematic longitudinal sectional front view similar to FIG. 1; 1.11.21...Core material, 2.12.22...
Metal material, 3... Fireproof frame, 5... Graphite link (
Type), 6...Water cooling jacket, 10.20.3(]
...Metal composite 2 material.

Claims (2)

[Claims] (1) Supply cold metal material into the gap between the inner surface of the refractory frame and the core material while gradually moving the metal core material from above to below through the refractory frame with a mold formed at the lower end. This is melted by induction heating, and cooled while the core material passes through the mold and exits downward, thereby welding the melted metal material as an outer layer to the outside of the core material and solidifying it. Continuous melting method for metal composite materials. (2) In the continuous melting method for metal composite materials according to claim (1), the shape of the metal material is powder, granule, wire, tape, fiber, or pipe surrounding the core material. A continuous melting method for a metal composite material characterized by comprising one or more of the following.