JPH07185649A - Production of composite material - Google Patents

Abstract

PURPOSE:To provide a process for production of a composite material which is capable of suppressing the uneven thicknesses of a coating layer and is adequate for production of the composite material having particularly the thin coating layer as the process for production of the composite material which produces the composite material by extruding a sheath metal on the circumference of a core material by an extrusion die and a nipple for supplying a core wire to be fitted into the extrusion die with the from end. CONSTITUTION:The sheath metal is supplied via grooves 3 to the circumference of the core wire by using the extrusion die 1 provided with the grooves 3 spirally on the circumference of a hole 2 through which the core wire passes. The sheath metal may otherwise be supplied to the circumference of the core wire by using the nipple provided with the grooves spirally on the outside surface of its front end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite material comprising a core material and a coating layer adhered to the peripheral surface of the core material, and is particularly suitable for producing a composite material having a thin coating layer. Of the composite material.

[0002]

2. Description of the Related Art FIG. 6 is a schematic view showing a friction drive type extrusion apparatus (conform apparatus) used for manufacturing a composite material. The drive wheel 14 is disposed with its central axis substantially horizontal, and a groove 15 extending in the circumferential direction is provided on the outer periphery of the drive wheel 14. The drive wheel 14 is driven by a drive device to rotate in a direction indicated by an arrow in the figure. Further, the groove 15 of the drive wheel 14 is supplied with the linearly-shaped outer cover metal 13.

A fixed shoe block 16 is arranged above the drive wheel 14. The fixed shoe block 16 is provided with an insertion hole 20 through which the core wire 10 is inserted. Further, a die block 19 composed of an extrusion die 21 and the like is arranged in the passage area of the core wire 10 of the fixed shoe block 16. Furthermore, this fixed shoe block 16 constitutes a conduit 17 through which the jacket metal 13 passes together with the groove 15 of the drive wheel 14. The end of the pipe line 17 is connected to a die block 19 via a hole 18 provided in the fixed shoe block 16.

Hereinafter, a conventional method for manufacturing a composite material using the friction drive type extrusion apparatus having the above-described structure will be described. First, the core wire 10 is passed through the die block 19 and moved in the longitudinal direction. Further, the drive wheel 14 is rotated, and the jacket metal 13 is supplied to the conduit 17 formed by the groove 15 and the fixed shoe block 16. Then, the jacket metal 13 advances in the pipe line 17 due to the frictional force with the drive wheel 14, flows from the end of the pipe line 17 through the hole 18, and enters the die block 19. Then, in the die block 19, the sheath metal is the core wire 10.
Is pressed against the peripheral surface of the extrusion die 21 as the core wire 1 moves.
Is extruded from. In this way, the composite material 10a including the core wire 1 and the coating layer can be obtained. In addition, in order to improve the bondability between the core wire and the coating layer, the composite wire manufactured in this manner may be subjected to heat treatment, wire drawing or rolling.

By the way, the composite material 10a manufactured by the above-mentioned friction drive type extrusion device has a drawback that the coating layer has a large uneven thickness. That is, in the above-mentioned friction drive type extrusion apparatus, since the jacket metal is supplied from the lower side of the core wire 10 through the hole 18, the pressure of the jacket metal around the core wire 10 is not uniform and the lower side ( The hole 18 side) is high and the upper side is low. Therefore, the coating thickness of the coating layer of the composite material 10a is thicker on the high pressure side (that is, on the hole 18 side) and thinner on the low pressure side.

Conventionally, in order to suppress uneven thickness of the coating layer, as shown in FIG. 7, a hollow mandrel 23, a barrier 24, a spacer 27 and an extrusion die 22 are arranged in this order from the core wire insertion side as a die block. It has been proposed to extrude the jacket metal 13 into the space 26 between the barrier 24 and the extrusion die 22 through the hole 25 of the barrier 24 and to make the flow of the jacket metal 13 uniform in the space 26. (Tokuhei 4-69
No. 008).

[0007]

However, in the technique disclosed in Japanese Examined Patent Publication No. 4-69008, it takes a long time from the start of work until a stable state in which the uneven thickness of the coating layer becomes small. There is a problem of doing. Further, in the case of producing a composite material in which the space factor of the coating layer is 30% or less, there is a problem that the effect of making the thickness of the coating layer uniform is not sufficient.

The present invention has been made in view of the above problems, and the thickness of the coating layer becomes uniform in a relatively short time from the start of the work, and the uneven thickness occurs even when the space factor of the coating layer is small. It is an object of the present invention to provide a method for producing a composite material that can be suppressed.

[0009]

According to a first aspect of the present invention, there is provided a method for manufacturing a composite material, wherein a core wire is provided in each hole provided in an extrusion die and a core wire supply nipple whose tip is fitted to the extrusion die. Through the extrusion die and the core wire supply nipple through the extruded metal around the core wire to produce a composite material in the method of manufacturing a composite material, in the inside of the extrusion die spirally around the hole. A plurality of grooves are provided, and the jacket metal is supplied around the core wire through the grooves.

In the method for manufacturing a composite material according to the second invention of the present application, a core wire is passed through each hole provided in an extrusion die and a core wire supply nipple whose tip portion is fitted into the extrusion die, and the extrusion die and In a method for manufacturing a composite material, in which a metal shell is extruded around the core wire through a core wire supply nipple to manufacture a composite material, a plurality of spirally shaped wires centering on the hole are formed on the outer surface of the tip portion of the nipple. Grooves are provided, and the jacket metal is supplied to the periphery of the core wire through these grooves.

[0011]

In the present invention, an extrusion die having a spiral groove inside thereof or a nipple having a spiral groove on the outer surface of the tip thereof is used, and a sheath is provided around the core wire through the groove. Since the metal is supplied, the jacket metal supplied around the core moves in the circumferential direction of the core. As a result, the pressure of the jacket metal in the circumferential direction of the core wire becomes substantially uniform in a short time from the start of the work, and even when the space factor of the coating layer is as small as 30% or less, a composite material with less uneven thickness of the coating layer Obtainable.

[0012]

Embodiments of the present invention will now be described with reference to the accompanying drawings. FIG. 1 is a plan view showing an extrusion die used in a method for manufacturing a composite material according to a first embodiment of the present invention, and FIG. 2 is a sectional view showing a die block incorporating this extrusion die. This die block is composed of a nipple 4 and an extrusion die 1. The extrusion die 1 has holes 2 with a diameter corresponding to the wire diameter of the desired composite material.
And four spiral grooves 3 centered on the hole 2 are provided on the inner surface thereof. As shown in FIG. 2, the nipple 4 and the extrusion die 1 are combined by inserting the tip of the nipple 4 into the inside of the extrusion die 1, and the fixed shoe of the friction drive type extrusion device as shown in FIG. It is placed in a block.

Hereinafter, a method of manufacturing a composite material using the friction drive type extruder equipped with the above-mentioned extrusion die 1 will be described. First, as shown in FIG. 2, the core wire 10 is passed through the die block, and while being moved in the longitudinal direction, the drive wheel is rotated to supply the jacket metal 13 to the die block. The jacket metal 13 supplied into the die block moves in the space formed by the groove 3 and the nipple 4 provided in the extrusion die 1, and in the moving direction A of the core wire 10 as shown in FIG. On the other hand, the end portion 5 of the nipple 4 is extruded around the core wire 10 in an oblique direction B. The outer metal 13 is pressure-bonded to the peripheral surface of the core wire 10 while moving in the peripheral direction of the core wire 10,
Further, it is extruded from the hole 2 in the moving direction of the core wire 10. Thereby, the composite material 10a can be obtained.

In the present embodiment, as described above, the jacket metal 13 extruded around the core wire 10 through the groove 3 moves in the circumferential direction of the core wire 10, so that the jacket wire 13 in the circumferential direction of the core wire 10 is moved. The pressure of the metal 13 becomes substantially constant in a short time. Therefore, the thickness of the coating layer can be made substantially uniform in a short time from the start of the work, and uneven thickness can be suppressed. Further, in the present embodiment, since the jacket metal extruded from four locations in the circumferential direction of the core wire 10 is pressed against the core wire 10 while moving in the circumferential direction of the core wire 10, the space factor of the coating layer is 30% or less. Even with a small composite material, uneven thickness of the coating layer can be suppressed.

In the above embodiment, as shown in FIG. 3, a direction B oblique to the moving direction A of the core wire 10 is used.
Although the case of supplying the jacket metal from above has been described, the extruding direction of the jacket metal may be a direction (tangential direction) orthogonal to the moving direction of the core wire 10.

Next, the results of actually manufacturing the composite material by the method of the above-described embodiment and examining the uneven thickness and the bondability of the coating layer will be described in comparison with a comparative example.

An aluminum-coated steel wire was manufactured by using a friction drive type extruder equipped with an extrusion die shown in FIGS. The die hole diameter is 6.2 mm, and four spiral grooves having a depth of 3 mm and a width of 5 mm are formed inside the extrusion die. In addition, an aluminum wire for electric use having a diameter of 9.5 mm was prepared as the outer metal. Further, as the core wire, three kinds of steel wires having diameters of 5.18 mm, 5.55 mm and 5.85 mm were prepared. The C content of these steel wires is 0.6% by weight.

Then, the steel wire is heated in an oxygen-free atmosphere at 350 ° C.
After heating to 1, the steel was passed through a die block equipped with the extrusion die, and the driving wheel was rotated to extrude aluminum around the steel wire to produce an aluminum-coated steel wire.
Further, as a comparative example, an aluminum-coated steel wire was produced in the same manner as in the above-mentioned example except that a friction drive type extrusion device equipped with a conventional die block was used.

Regarding the composite material produced in this way,
The minimum and maximum thickness of the aluminum coating layer was measured. Then, the uneven thickness ratio was calculated by the following mathematical formula 1.

[0020]

[Equation 1] Uneven thickness ratio = {(maximum thickness-minimum thickness) / (maximum thickness + minimum thickness)} × 100 (%) In addition, a specimen with a length of 1 cm is cut out from each composite material. ,
A compressive load was applied from the side, and the minimum load (crushing property) at which peeling between the aluminum coating layer and the core wire occurred was examined to evaluate the bondability between the coating layer and the core wire. The results are shown in Table 1 below. However, the uneven thickness ratio and the crushing property were measured for three samples for each of the examples and comparative examples, and shown as the average value of the measured values.

[0021]

[Table 1]

As is clear from Table 1, Comparative Examples 1 to 1
No. 3 has a large eccentricity when the space factor of the coating layer is 30% or less, whereas Examples 1 to 3 have an extremely small eccentricity. In addition, all of Examples 1 to 3 are superior in crushing property to Comparative Examples 1 to 3 and also have good bondability between the aluminum coating layer and the steel core wire. As described above, in this example, since the bondability between the core material and the coating layer immediately after extrusion is good, post-treatment for improving the bondability such as heat treatment, wire drawing and rolling treatment is omitted or There is also an effect that it can be simplified.

4 (a) and 4 (b) are a plan view and a side view, respectively, showing a nipple used in the method for manufacturing a composite material according to the second embodiment of the present invention. FIG. 5 shows the nipple 4a incorporated therein. It is a sectional view showing a die block. This die block is composed of a nipple 4a and an extrusion die 1a. The nipple 4a is provided with a hole 2a having a diameter corresponding to the diameter of the core wire 10, and four holes centering on the hole 2a are provided on the outer peripheral surface of the tip portion (the portion where the extrusion die 1a is fitted). Is provided with a spiral groove 3a. These nipple 4a and extrusion die 1a are shown in FIG.
As shown in, the tip of the nipple 4a is pushed through the extrusion die 1a.
The inserts are assembled so that they can be inserted inside, and they are arranged in the fixed shoe block of the friction drive type extrusion device.

Hereinafter, a method of manufacturing a composite material using the friction drive type extrusion apparatus having the above-mentioned nipple 4a will be described. First, as shown in FIG. 5, the core wire 10 is passed through the die block, and while being moved in the longitudinal direction, the drive wheel is rotated to supply the jacket metal 13 to the die block. The jacket metal 13 supplied into the die block moves in the space formed by the groove 3a provided in the nipple 4a and the extrusion die 1a, and the nipple 4a moves in a direction oblique to the moving direction of the core wire 10. It is extruded from the end portion 5 around the core wire 10. The outer metal 13 is pressure-bonded to the peripheral surface of the core 10 while moving in the peripheral direction of the core 10, and the die 1a
It is extruded from the hole 2 in the moving direction of the core wire 10. Thereby, the composite material 10a can be obtained. Also in this embodiment, the same effect as that of the first embodiment can be obtained.

In the above embodiments, the case where the core material is steel wire and the coating layer is aluminum has been described.
As the material of the core material, for example, iron (steel), copper, aluminum, nickel or alloys thereof can be used, and as the material of the coating layer, for example, aluminum, copper,
Zinc, lead, alloys thereof, or the like can be used.
As the extrusion device, in addition to the friction drive type extrusion device provided with the above-mentioned drive wheel and fixed shoe block, for example, a billet type extruder constituted by a container and a ram and an opposite drive caterpillar and both side surfaces are fixed. Friction-driven extrusion device composed of walls (Rynex device:
Wire Journal, April 1976, p. 64) etc. can be used.

[0026]

As described above, according to the present invention, an extrusion die having a spiral groove inside thereof or a nipple having a spiral groove outside the tip portion thereof is used to insert the spiral groove through the groove. Since the jacket metal is supplied to the periphery of the core wire, the pressure of the jacket metal in the circumferential direction of the core wire becomes uniform in a short time from the start of the work, and uneven thickness of the coating layer can be suppressed and the coating can be performed. The adhesion of the layer is also improved. In particular, the present invention is extremely useful for manufacturing a composite material having a thin coating layer, since even a thin composite material having a coating layer space factor of 30% or less has less uneven thickness.

[Brief description of drawings]

FIG. 1 is a plan view showing an extrusion die used in a method for manufacturing a composite material according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a die block similarly incorporating the extrusion die.

FIG. 3 is a schematic view showing the extruding direction of the sheath metal with respect to the core wire.

4 (a) and 4 (b) are respectively a plan view and a side view showing a nipple used in a method for manufacturing a composite material according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing a die block similarly incorporating the nipple.

FIG. 6 is a schematic view showing a friction drive type extrusion device (conform device) used for manufacturing a composite material.

FIG. 7 is a cross-sectional view showing an example of a conventional die block used in a friction drive type extrusion device.

[Explanation of Codes] 1,1a, 21, 22; Extrusion Dies 2, 2a; Holes 3, 3a; Grooves 4, 4a; Nipple 10; Core Wire 10a; Composite Material 13; Outer Metal 14; Drive Wheel 16; Fixed Shoe Block 19; Dice Block 23; Mandrel

Claims (2)

[Claims] 1. A core wire is inserted into each hole provided in an extrusion die and a nipple for supplying a core wire whose tip is fitted to the extrusion die, and the core wire is provided around the core wire through the extrusion die and the nipple for supplying the core wire. In the method for producing a composite material by extruding a jacket metal to produce a composite material, a plurality of grooves are provided spirally around the hole inside the extrusion die, and the core wire is provided through these grooves. A method for producing a composite material, comprising supplying the outer coating metal to the periphery of the composite material. 2. A core wire is passed through each hole provided in an extrusion die and a core wire supply nipple whose tip portion is fitted into the extrusion die, and the core wire is provided around the core wire through the extrusion die and the core wire supply nipple. In the method for manufacturing a composite material in which a metal jacket is extruded to manufacture a composite material, a plurality of grooves are provided spirally around the hole on the outer surface of the tip end portion of the nipple, and these grooves are interposed. A method of manufacturing a composite material, comprising: supplying the sheath metal around the core wire.