JP2002172419A - Friction drive type extruding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a friction drive type extruding apparatus capable of positively preventing an aggregate of oxide from being mixed into extruded products, and simultaneously, capable of not causing degradation of productivity, since there is no factor to generate deterioration of workability such as a hood installation work. SOLUTION: The friction drive type extruding apparatus comprises a wheel wherein a groove extending to the axial direction is formed on the peripheral surface and rotatably driven, a supply means to supply extruding materials inside the groove, a die to extrude and form the extruding materials and an abutment 18 provided so as to go into the groove by blocking a passage of the extruding materials leading to the die. The abutment 18 is of a rectangular solid type and the copper materials supplied through the groove inside the wheel abut on the one surface in the longitudinal direction, namely, on No.1 surface 18a (upper or front surface) and on the other surface in the longitudinal direction, namely, on No.2 surface 18b (lower or back surface), the abutment 18 is supported by a shoe block. And, the area of No.1 surface 18a is smaller than that of No.2 surface 18b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction drive type extrusion apparatus for extruding a rectangular copper wire and a copper-coated steel wire, and more particularly to a method of removing oxide mixed in a copper layer portion of the copper rectangular wire and the copper-coated wire. The present invention relates to a friction drive type extrusion device that reliably prevents an aggregate from being mixed into an extruded product.

[0002]

2. Description of the Related Art Friction-driven extrusion devices such as conforming machines are used for producing copper flat wire or copper-coated steel composite wire. FIG. 4 is a schematic view showing a conventional conform machine.
The rotating wheel 1 is provided so as to be rotatable with its rotation center axis horizontal, and is driven to rotate by an appropriate driving device. A groove 2 extending in the circumferential direction is formed on the peripheral surface of the rotating wheel 1, and a copper material 3 is supplied into the groove 2 from an appropriate supply device. A guide roller 10 is provided near the position where the copper material 3 is supplied to the wheel 1, and the copper material 3 is guided into the groove 2 by the guide roller 10.

A shoe block 5 is provided downstream of the guide roller 10 in the direction of rotation of the wheel 1. The shoe block 5 has a shape following the peripheral surface of the wheel 1 at a portion on the copper material inlet side.
An introduction path 4 of the copper material 3 is formed between the wheel 1 and the wheel 1. An abutment 8 is supported by the shoe block 5 at the portion of the shoe block 5 on the copper material outlet side so as to enter the groove 2 and be interposed in the groove. A die chamber 6 is arranged outside the abutment 8, and a die 7 is arranged in the die chamber 6. The die chamber 6 and the die 7 are also supported by the shoe block 5. Further on the downstream side of the shoe block 5, a scraping device 1 for scraping the copper material 3 remaining in the groove 2 of the wheel 1 from the groove 2
3 is provided, whereby the copper material 3 in the groove is removed as a flash and discharged, so that the inner surface of the groove 2 is cleaned and a new copper material 3 is supplied.

In the conventional abutment 8 of the friction drive type extruder, deformation resistance at high temperature (high-temperature strength) is regarded as important,
Generally, hard but brittle materials are used. As shown in FIG. 5, the abutment 8 has a substantially rectangular parallelepiped shape, and its cross section has a substantially rectangular shape with one edge rounded to match the cross section of the groove 2 of the wheel 1. FIG.
FIG. 5 is a bottom view when the abutment 8 is viewed from above from below, and is a bottom cross-sectional view when cut at the position of the lower surface 8 d of the abutment 8. As shown in FIG. 6, the lower surface 8d of the abutment 8 has a smaller area than the upper surface 8c, and the upper surface 8c with which the supplied copper material 3 comes into contact has the largest area. ing. As described above, the upper portion has a larger cross-sectional area because the copper layer in the groove has cut into the gap between the abutment and the groove after the end of the extrusion molding process, and In order to take out both upwards into the die chamber 6, ease of removal is taken into consideration.

[0005] In the friction drive type extrusion apparatus configured as described above, when the copper material 3 is supplied into the groove 2 of the wheel 1, the contact between the groove 2 of the wheel 1 rotating at high speed and the copper material 3 is made. The copper material 3 is heated by the frictional force, and the copper material 3 becomes plastic and fluid and enters the shoe block 5. This plastically fluidized copper material 3 comes into contact with the abutment 8 attached to the shoe block 5, switches its direction, and is introduced into the die chamber 6. Then, the copper material 3 is extruded by a die 7, and is then led out as an extruded body 9. The copper material 3 that has passed through the gap between the abutment 8 and the inner surface of the groove remains as a copper layer on the inner surface of the groove, and is scraped off by a scraping device 13 such as a brush.

However, in the extruded molded body 9,
Particularly, in the case of a material which is easily oxidized such as copper, an aggregate of oxides often occurs in the molded body 9, and this oxide aggregate is a source of defects such as swelling, peeling or tearing of the extruded molded body 9. Becomes

The copper material 3 is supplied after completely removing oil or oxides on the surface in advance, but the copper material 3 is pushed between the groove 2 on the wheel outer peripheral surface and the shoe block 5 by friction drive. When the copper material 3 is introduced into the die chamber 6 after being pressed against the abutment 8, the surface of the copper material 3 is oxidized because the copper material 3 is exposed to the atmosphere at a high temperature in the gap between the wheel 1 and the die chamber 6. Easy to be.

[0008] In order to solve this problem, the following methods have conventionally been proposed. A method of spraying an inert gas or a reducing gas onto the introduction path 4, the die chamber 6, and the abutment 8, which become hot during extrusion, to prevent oxidation (GB-B-224166)
0). A method in which the whole or a part of the apparatus is covered with a hood and filled with an inert gas or a reducing gas to prevent oxidation (Japanese Patent Application Laid-Open No. 9-507434). When the copper layer remaining in the groove 2 of the wheel 1 after passing through the abutment 8 is exposed to the atmosphere at a high temperature,
Since the oxide layer 12 is generated and becomes a mixing source of oxide, FIG.
As shown in (1), a method of mechanically removing this with a scraping device 13 such as a brush.

[0009]

However, this method tends to entrain the atmosphere when the inert gas or the reducing gas is blown. Further, there is a defect that the reduction reaction cannot be completed in a condition where the extrusion speed is high and the generation of the oxide and the entrainment of the oxide are performed rapidly.

The method (1) has disadvantages in that the workability is deteriorated because the entire device is covered with a hood, and the cost of the device is increased.

In the method described above, a part of the oxide scraped off by a brush or the like adheres to the surface of the supplied copper material and is pressed against the abutment, thereby switching the direction and entering the die chamber. There is.

The present invention has been made in view of such a problem, and can surely prevent an aggregate of oxides from being mixed into an extruded product, and at the same time, such as an operation of attaching a hood. It is an object of the present invention to provide a friction drive type extruder that does not cause any deterioration in workability and does not cause deterioration in productivity.

[0013]

According to the present invention, there is provided a friction drive type extrusion apparatus according to the present invention, comprising a wheel having a circumferential surface formed with a groove extending in a circumferential direction and being driven to rotate, and a supply means for supplying an extruded material into the groove. A die for extruding the extruded material, an abutment arranged to enter the groove to prevent passage of the extruded material and guide the die, and a shoe block for supporting the die and the abutment. The abutment is supported by the shoe block on the upstream side in the groove moving direction of the extruded material and in contact with the extruded material moving in the groove on the first surface and on the downstream side. And the area of the first surface is smaller than the area of the second surface.

In this friction drive type extruder, a die chamber for accommodating the die is provided, and the size of a material supply hole to the die is smaller than the area of the first surface of the abutment. Is preferred.

If the surface (upper surface or front surface) of the abutment in contact with the extruded material such as a copper material has the largest area in the cross section as in the prior art, the copper material in the groove is not After being pressed against the front surface of the die, it is supplied to the die chamber in a different direction, but since the width of the abutment is equal to the width of the supplied copper material, the thickness of the copper layer in the groove fluctuates. The present inventor has found that the oxide generated on the outer surface of the material and the oxide on the surface of the copper layer are supplied into the die chamber and the oxide is involved in the extruded product.

On the other hand, in the present invention, the shape of the abutment is changed to the first abutment of the extruded material in the wheel groove.
Since the area of the surface is smaller than the area of the second surface (the surface supported by the shoe block) on the opposite side, the extruded material supplied to the abutment in the groove has a portion on the outer surface thereof. But abut the first side of the abutment,
The extruded material is pressed and oriented in the direction of the die chamber, and the portion of the outer surface of the extruded material passes without abutting on the first surface of the abutment, and the width of the abutment gradually increases to increase the gap between the abutment and the inner surface of the groove. Since the gap gradually decreases, a part of the extruded material is discharged as flash chips, and the remaining part passes through the abutment as it is and remains as chips in the groove. Thus, in the present invention, even if the supplied extruded material is exposed to the atmosphere at a high temperature and the outer surface is oxidized,
Since this part does not touch the first surface of the abutment,
Rather than heading into the die chamber, the oxides are entangled in the dies and ensure that the oxides do not enter the extruded product.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a friction drive type extrusion apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing an abutment used in a friction drive type extrusion apparatus according to an embodiment of the present invention, and FIG. 2 is a view of the vicinity of an abutment 18 of the friction drive type extrusion apparatus of the embodiment viewed from below to above. FIG. 4 is a bottom view of the abutment 18 when cut at the position of the bottom face 18 b of the abutment 18. In addition, the friction drive type extrusion device of the present embodiment
The feature of the abutment 18 is that it is basically the same as the conventional friction drive type extruder in other configurations. Therefore, in addition to FIGS. 1 and 2, a friction drive type extrusion apparatus according to an embodiment of the present invention will be described with reference to FIG. Also,
The same components as those of the conventional friction drive type extrusion device are denoted by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, the abutment 18 has a rectangular parallelepiped shape, and one surface in the longitudinal direction, that is, a first surface 18a (upper surface or front surface) is supplied with copper material supplied in the groove 2 of the wheel 1. 3 abuts on the other surface in the longitudinal direction, that is, the second surface 18b (lower surface or rear surface).
Supported by The cross section of the abutment 18 has the smallest area of the first surface 18a with which the copper material 3 at the upper end abuts, increases as it goes down, and has the largest area of the second surface 18b supported by the shoe block 5 at the lower end. growing. In the present embodiment, the size (hole area) of the supply hole of the die chamber 6 for supplying the copper material 3 from the abutment 18 into the die chamber 6 is larger than the area of the first surface 18a of the abutment 18. small.

In the friction drive type extruder of the present embodiment thus configured, the copper material 3 is supplied into the groove 2 of the wheel 1 and guided by the guide roller 10 into the groove 2 to form the shoe block 5. It moves to the arrangement position. During this time, the copper material 3 is heated due to friction between the inner surface of the groove 2 of the wheel 1 rotating at high speed, becomes plastically fluid, and comes into contact with the abutment 18 arranged in the shoe block 5. At this time, the second surface 1 on the lower surface of the abutment 18
8b has a shape and a size substantially following the inner surface of the groove 2, but since the first surface 18a on the upper surface of the abutment 18 has a relatively large gap between the first surface 18a and the inner surface of the groove 2, the copper material in the groove 2 3 has a first surface 18a except for an outer surface thereof.
And changes its course toward the die chamber 6,
Extruded through a die 7. On the other hand, the first surface 18a
The outer surface portion of the copper material 3 that does not come into contact with the metal material tries to pass through the abutment 18 as it is. At this time, since the width of the abutment 18 is gradually increasing,
It is rubbed between the side surface of the abutment 18 and the inner surface of the groove 2 to be discharged as flash debris, and the remainder remains as a copper layer on the inner surface of the groove 2. The copper layer is moved to the position where the scraping device 13 such as a brush is disposed with the rotation of the wheel 1 and is scraped off from the groove 2 by the brush or the like.

In the present embodiment, when the copper material 3 is transferred from the abutment 18 to the die chamber 6, the outer surface portion thereof is removed, and then the copper material 3 enters the die chamber 6. Oxide is prevented from entering the die chamber 6.

In this embodiment, even if the relative position between the cross section of the copper material 3 supplied to the abutment 18 and the first surface of the abutment 18 is displaced due to fluctuation of the wheel rotation or the like. In the method, the oxide generated on the outer surface of the copper material is not caught in the extruded product. After passing through the abutment, the shape of the residual copper layer (hereinafter also referred to as a layer) remaining in the groove of the wheel is determined by the shape of the maximum area of the abutment. 3 (a) and 3 (b) are schematic diagrams showing the state of oxide inclusion in the extruded product due to the variation in the thickness of the residual copper layer (layer 20) in the groove in the conventional case and the present embodiment, respectively. It is.

In the conventional case shown in FIG. 3A, the copper material 3 sent to the abutment 8 in the groove 2 of the wheel 1 is guided to the die by the first surface (upper surface) 8c of the abutment 8. I will The copper layer that has passed through the gap between the groove 2 and the first surface 8c, which is the largest area of the abutment, becomes the remaining copper layer (layer 20) by the rotation of the wheel, and becomes the first surface 8c of the abutment. Come up. An oxide is generated on the outer surface of the copper material 3 newly supplied into the wheel groove, and the oxide layer 12 exists on the inner surface of the layer 20. Conventionally, newly supplied copper material 3
And the area of the first surface 8c (maximum area) of the abutment was the same, so that the first surface 8c and the copper When the cross section of the material 3 is relatively displaced, the oxidized layer 12 on the outer surface of the copper material 3 comes into contact with the first surface 8c of the abutment and is supplied into the die chamber, and the oxidized material is oxidized in the extruded product. Things get caught.

On the other hand, in the case of this embodiment shown in FIG. 3B, the layer 20 is determined by the shape of the second surface (maximum area) of the lower surface of the abutment 18. Since the first surface 18a of the upper surface of the abutment 18 is smaller than the second surface, the first surface 18a of the abutment 18 remains on the outer surface of the newly supplied copper material 3 even if the rotation of the wheel is shaken. That is, the oxide layer 12 existing on the inner surface of the layer 20
Never abut. Therefore, the oxide layer 12 is not guided from the abutment to the die chamber. Therefore, even if the thickness of the layer 20 in the groove fluctuates differently on the left and right in FIG. 3 due to the rotation of the wheel, the oxide layer 12 is prevented from being caught in the die chamber.

In this embodiment, since the size of the supply hole for the copper material 3 into the die chamber 6 is smaller than the size of the first surface 18a, the copper material 3 comes into contact with the first surface 18a toward the die chamber 6. Only the central part of the copper material 3 enters the die chamber 6. For this reason, the portion of the copper material 3 from which the outer surface portion has been removed enters the die chamber 6, so that the entrapment of the oxide can be more reliably prevented. Furthermore, after scraping the oxidized copper material 3 remaining in the groove 2 with a scraping device 13 such as a brush, a part of the scraped oxide is removed from the surface of the newly supplied copper material 3. However, since the first surface 18a of the abutment 18 has a smaller area than the second surface 18b and a smaller area than the moving area of the copper material 3 in the groove 2, the surface of the copper material 3 The attached oxide does not come into contact with the first surface 18a of the abutment 18 and does not enter the die chamber 6.

As described above, according to this embodiment, the oxide is reliably prevented from being caught in the die chamber 6, and the oxide is prevented from being mixed into the extruded product.

[0026]

Hereinafter, the effect of preventing the entrainment of oxides in the friction drive type extrusion apparatus according to the embodiment of the present invention will be specifically described in comparison with a comparative example.

An oxygen-free copper wire having a diameter of 12 mm (JIS C1020) was used as the copper material 3 to extrude a rectangular copper wire.

The oxygen-free copper wire is manufactured by a dip forming method, and the surface thereof is degreased and washed with a solvent or the like, and is further subjected to pickling to remove the stain on the surface. Supplied. 5 mm × 5 mm (Example 1), 2
Prototypes of three sizes of rectangular copper wires of mm × 5 mm (Comparative Example 2) and 9 mm × 9 mm (Comparative Example 3) were produced.

In Examples 1 and 2, extrusion molding was performed using a die chamber equipped with the abutment of the present invention having the shape shown in FIGS.

In Comparative Example 1, the conventional abutment shown in FIGS. 5 and 6 was mounted, the entire wheel was surrounded by a hood, and nitrogen gas was introduced into the inside to perform extrusion molding.

In Comparative Example 2, the abutment having the conventional shape shown in FIGS. 5 and 6 was mounted, and extrusion molding was performed while removing the oxide layer on the surface of the copper layer by brush polishing.

The evaluation was conducted by examining the presence or absence of oxides and voids in the cross section of the extruded product, observing the appearance of the extruded product when the extruded product was heated at 650 ° C. for 1 hour, and observing whether the surface was swollen. And the workability such as die chamber replacement was also compared and evaluated. In addition, the case where swelling occurred in the appearance after the heating test was evaluated as x, and the case where no swelling was observed was evaluated as ○. In addition, the case where the workability was relatively good was evaluated as ○, and the case where the workability was poor was evaluated as ×. The results are shown in Table 1 below.

[0033]

[Table 1]

As is apparent from Table 1, in the case of Examples 1 and 2 of the present invention, no oxides and voids were generated in the copper extruded product, and the appearance after the heating test did not swell. Was. Workability is also good. However, in Comparative Example 1, the workability was poor, the oxide was present, and the quality of the extruded product was poor. In Comparative Example 2, both oxides and voids were generated, and swelling was also observed in appearance observation after the heating test.

[0035]

As described above in detail, according to the present invention, the cross-sectional area of the extruded material supplied in the groove of the wheel is:
Even if the outer surface of the extruded material does not come into contact with the abutment, and the extrusion surface slightly fluctuates, the outer surface of the extruded material is sufficiently larger than the area of the contact surface (first surface) of the abutment. Is passed through the abutment or removed from within the groove. For this reason, the oxide on the outer surface of the extruded material is prevented from being caught in the die chamber from the abutment and mixed into the extruded product.

Further, in the present invention, the apparatus is simpler than the method in which the entire wheel is surrounded by a hood, and the workability such as die chamber and die exchange is good.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an abutment used in a friction drive type extrusion apparatus according to an embodiment of the present invention.

FIG. 2 is a bottom view of the abutment mounted on the friction drive type extrusion device of the present embodiment as viewed from below toward above.

FIGS. 3 (a) and 3 (b) show the state of entanglement of an oxide in an extruded product due to a change in the thickness of a residual copper layer (layer 20) in a groove in the conventional case and the present embodiment, respectively. It is a schematic diagram.

FIG. 4 is a schematic diagram showing a friction drive type extrusion device (conform machine).

FIG. 5 is a perspective view showing an abutment used in a conventional friction drive type extrusion device.

FIG. 6 is a bottom view of an abutment mounted on a conventional friction drive type extrusion device as viewed from below toward above.

[Explanation of symbols]

 1; wheel 2; groove 3; copper material 4; introduction path 5; shoe block 6; die chamber 7; die 8; abutment 9; extruded body 10; guide roller 12; oxide layer 13; scraping device 20; Layer

Claims (2)

[Claims] 1. A wheel having a circumferential surface formed with a groove extending in a circumferential direction and driven to rotate, a supply means for supplying an extruded material into the groove, a die for extruding the extruded material, and a An abutment arranged to enter to prevent the extruded material from passing therethrough and leading to the die, and a shoe block supporting the die and the abutment, wherein the abutment includes And a second surface supported by the shoe block on a downstream side, the first surface being in contact with the extruded material moving in the groove on the upstream side in the moving direction of the first surface. A friction-driven extrusion device having an area smaller than an area of the second surface. 2. A die chamber for accommodating the die, wherein a size of a material supply hole to the die is smaller than an area of the first surface of the abutment. Item 2. A friction drive type extrusion device according to Item 1.