JPS59199112A - Extrusion coating method of composite material - Google Patents

Abstract

PURPOSE:To extrusion coat a core material into a composite material excellent in characteristic properties such as toughness while reducing the wear of core material by forming a dispersion coating layer of high-temperature lubrication particles on the surface of a fixing member used for positioning an extrusion die, and extrusion-coating the core material. CONSTITUTION:A fixing member 3 for fixing the position of a core material 1 made of iron, copper, etc. is provided to the vicinity of an extruding part to position the material 1 with respect to an extrusion die 4, then the material 1 is passed together with a coating material 2 to be extruded by an extrusion ram 5, such as Al different in kind from the material 1, through the die 4 and is formed into a composite material 6. A part of the member 3 which is in contact with the material 1 is provided with a coating layer 7 formed by dispersing the particles having high lubrication properties, then the friction between the material 1 and the member 3 is reduced by the layer 7 to improve the characteristic properties of the material 6 as well as to improve its productivity by reducing the frequency of changing the member 3. For the particles having high lubrication properties, graphite fluoride, molybdenum disulfide, and boron nitride, etc. are suitable, and the coating layer 7 is formed by plating, flame spraying, and metallizing, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method of covering a long metal core material with different kinds of outer metals by extrusion processing.

(Background Art) In order to control the peripheral thickness of the outer sheath metal around the core material in the extrusion coating method, as shown in the figure, a fixing member 3 is used to fix the position of the core material 1 near the extrusion part. A method is adopted in which the position of the extrusion die 4 is adjusted with respect to the extrusion die 4. In the figure, 2 is a jacket metal, 5 is an extrusion ram, and 6 is a composite material.

In such a method, since the fixing member 3 of the core material 1 contacts the core material 1 in a normally fixed state, the friction between them causes severe wear of the core material 1, and the characteristics of the core material, especially the twisting characteristics, fatigue This resulted in deterioration of properties, elongation, winding properties, etc., and it was necessary to frequently replace the fixing member 3, resulting in poor productivity.

(Disclosure of the Invention) The present invention has been made in order to eliminate the above-mentioned drawbacks.
By imparting high-temperature lubricity to the fixing member of the core material, the friction between the core material and the fixing member is significantly reduced, greatly improving the properties of the composite material, especially the toughness, and also reducing the tendency of replacement of the fixing member. It is an object of the present invention to provide a method for extrusion coating of composite materials that reduces the amount of waste and improves productivity.

The present invention provides a method for coating a metal core material with a different type of sheath metal by extrusion processing, in which a coating in which particles having high-temperature lubricity are dispersed is applied to a portion of the core material that contacts the core material of a fixing member. This is an extrusion coating method for composite materials, which is characterized by forming layers and extruding them.

The core material used in the present invention is iron (steel), Cu, AJ, N
b, etc. or alloys thereof (e.g., Fe-N1゜N b -T
i, etc.).

In addition, the outer covering metals include kl, Cu, Sn, Zn,
Pb or an alloy thereof is used.

Examples of extruders used in extrusion processing include an extruder with a conventional container and a ram, and a friction-driven extruder consisting of a drive wheel with a groove on its outer periphery and a fixed shoe plotter that engages a part of the outer periphery. (Example: Japanese Patent Publication No. 47-3185
No. 9, Conform device) A friction-driven extrusion device (e.g., Wi
re Journal.

April 1976 issue, p64. Any extruder such as a Lynex device) may be used.

Hereinafter, the present invention will be explained by examples using the drawings.

The figure is a longitudinal sectional view showing an example of an extruder used in an example of the method of the present invention. In the figure, numerals other than 7 indicate the aforementioned parts.

Reference numeral 3 denotes a fixing member that adjusts and fixes the position of the core material 1 relative to the extrusion pin 4. In the present invention, particles having high-temperature lubricity are added to the portion of the fixing member 3 that contacts the core material 1 near the extrusion part. A coating layer 7 having dispersed therein is provided.

Here, as the particles having high-temperature lubricity, it is preferable to use particles made of graphite fluoride, molybdenum disulfide, boron nitride, etc., and as the coating layer, a plating layer (e.g., plating with Ni, Cu, etc.) is preferable. , a thermal spray layer, a vapor deposited layer, etc. can be employed, and the above-mentioned particles are used in these coatings by dispersing them.

The reason why this coating layer 7 has high-temperature lubricity is as follows.
Usually, the fixing member 3 is located near the extruded part of the sheath metal 2.
L. This is because it is subjected to friction at high temperatures.

Note that it is desirable to provide the coating layer 7 not only on the part of the fixing member 3 that contacts the core material 1, but also on the part that contacts the high-temperature outer sheath metal 2 near the extrusion part.

If the coating layer 7 is provided on the fixing member 3 like a double series, the friction between the core material 1 and the fixing member 3 will be greatly reduced due to the high-temperature lubricity of the coating layer. There is no damage, and the fixing member 3 is also not damaged.

(Example) ] 'Ji 39%, Cr 1.5%, Mo 1.6%, S
Fe added with i0.7%, C0.3%, Mn0.3%
After the -Ni alloy was melted and cast, it was hot rolled to create a wire rod with a diameter of 9 mm.

This wire rod was stripped, annealed, and drawn to a length of 5 m.
The core wire was mΦ.

This core wire was preheated by Tiscaler-1 and supplied to an extruder as shown in the figure, and a pure A7 jacket metal was extruded and coated around it.

At this time, the following three types of fixing members 3 for the core material were used, and the gap between them and the core wire was 0.2 mm.

(a) Tool steel without coating.

(b) A 200μ thick N1 plating layer with 20% by volume of fluorinated graphite particles dispersed on the surface of the tool steel.

(C) A Ni plating layer with a thickness of 200μ in which 20% by volume of molybdenum disulfide particles are dispersed is provided on the surface of tool steel.

Wire pure AJ with a thickness of 0.5mm around a core wire of 5mmΦ
Extrusion coating at 10m/min and 6mmΦ A/? 9Fe-
After creating the Ni alloy wire, it was drawn to a diameter of 4.2 mm.

The tensile strength, elongation, twist value, winding and unwinding characteristics, and fatigue limit of the obtained 4.2 mmΦ composite wire are as shown in Table 1.

The winding and unwinding characteristics are as follows: winding and unwinding 8 times around the self-diameter,
The presence or absence of breakage was investigated. Further, the fatigue limit was measured using a Nakamura type fatigue tester.

Furthermore, when we observed the fixing member 3 and the core material 1 after extruding each fixing member for about 1 hour, we found that in the conventional method (a), both were severely worn and could not withstand subsequent production. In (b) and (C) according to the invention, both had slight wear, and the wear in (b) was even slighter than in (c).

Table 1 From Table 1, (b) and (C) according to the present invention are different from (
It can be seen that all properties are excellent compared to a), especially toughness. Also, between (b) and (C), (b) has better toughness.

(Effects of the Invention) The extrusion coating method for a composite material of the present invention configured as described above has the following effects.

(b) Because a coating layer in which particles with high temperature lubricity are dispersed is provided on the part of the core material that contacts the core material of the fixing member and extruded, the friction between the core material and the fixing member is caused by the high temperature of the coating layer. Since the lubricity greatly reduces the amount of heat, the core material is not damaged by the fixing member, and the properties of the resulting composite material, especially its toughness, are greatly improved.

(b) Due to the above-mentioned significant reduction in friction, the fixing member is not damaged, so the frequency of replacement of the fixing member is greatly reduced, which improves productivity.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view showing an example of an extruder used in an example of the present invention. 1-Core material, 2-Sheath metal, 3-Fixing member, 4-Extrusion goose, 5-Extrusion ram, 6-Composite material, 7-Coating layer.

Claims (3)

[Claims] (1) In a method of coating a metal core material with a different type of sheath metal by extrusion processing, a coating layer in which particles having high temperature lubricity are dispersed is placed on the portion of the core material that comes into contact with the core material of the fixing member. An extrusion coating method for composite materials characterized by extrusion with a (2) A technique for extruding a composite material according to claim 1, wherein the particles are particles having high-temperature lubricity or are made of graphite fluoride, molybdenum disulfide, or borosininitride. (3) The extrusion coating method for a composite material according to claim 1 or 2, which is a coating layer, a plating layer, a thermally sprayed layer, or a vapor deposited layer.