JP2002172418A - Apparatus for extruding copper or copper alloy product and method for extruding same using the apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for extruding copper or copper alloy products and a method for extruding copper or copper alloy products using the apparatus capable of preventing flaws on the surface of extruded products from occurring by restraining stack of oxide on the dies. SOLUTION: A groove 2a having an amplitude of vibration of 0.1 mm to 0.5 mm which meanders periodically in the wheel width direction is formed in the wheel 1a. Accordingly, when the wheel 1a rotates, a relative position of the portion where an abutment 8 of the groove 2a against the entrance of a die chamber 6 is inserted fluctuates periodically. Consequently, the flow direction of a plastic fluid 12 in the die chamber 6 begins to fluctuate and the relative position against the entrance of the die 7 where copper oxide absorbed into the die chamber runs begins to fluctuate, too. Accordingly, copper oxide is unable to stack in the entrance of the die 7, and even when extruding long sized copper products for a long stretch of time, flaws on the surface of copper products accompanied by stack of copper oxide are not easily generated and copper products having excellent surfaces can be manufactured stably over a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously extruding a copper or copper alloy wire material by extrusion using a conform.
The present invention relates to a copper or copper alloy product extrusion molding apparatus suitable for molding a rectangular wire, a segmental conductor strand or a copper-coated composite wire, and an extrusion molding method using the same. The present invention relates to a copper or copper alloy product extrusion molding apparatus and an extrusion molding method.

[0002]

2. Description of the Related Art Conventionally, copper products such as copper pipes, copper rectangular wires and copper wires for segmental conductors, and copper-coated composite wires such as copper-coated steel wires and copper-coated aluminum wires are formed by extrusion molding called a conform extruder. It is manufactured by extrusion molding using an apparatus.

FIG. 2 is a sectional view showing a conventional extrusion molding apparatus. FIG. 3 is a cross-sectional view (cross-sectional view along line XX in FIG. 2) showing a relative positional relationship between the wheel 1 and the die chamber 6 and the die 7 in the conventional extrusion molding apparatus. FIG. 4 is a sectional view taken along line YY of FIG. 3. A groove 1 into which a copper material 3 is fitted is formed along a circumferential direction on a peripheral surface of a wheel 1 of the extrusion molding apparatus, and is driven to rotate in a fixed direction. A shoe block 5 is provided along a peripheral surface of the wheel 1 from above to a side of the wheel 1. The shoe block 5 is provided with a die chamber 6 at a position in a side area of the center axis of the wheel 1. An extrusion die 7 for defining the extrusion shape of the molded product is fitted in the die chamber 6. An introduction path 4 is formed by the shoe block 5 and the wheel 1, and a guide roller 10 is provided at an entrance thereof. The copper material 3 is guided by the guide roller 10 and drawn into the introduction path 4, and the copper material 3 is introduced into the introduction path 4.
Is heated by frictional heat between the introduction path 4 and the wheel 1 and plasticized and fluidized. An abutment 8 is inserted into the groove 2 of the wheel 1 at the end of the introduction path 4.

When a copper material is extruded into a rectangular copper wire using the conventional extrusion molding apparatus having the above-described structure, first, the formed copper material 3 has an oxide film on its surface and dirt such as oil. Is completely removed, the guide roller 10
Is continuously drawn into an introduction path 4 formed by a wheel 1 guided and driven by a shoe and a fixed shoe block 5, changed direction by an abutment 8, and then supplied into a chamber of a die chamber 6. At this time, the copper material 3 in the introduction path 4 and the interior of the die chamber 6 becomes a plastic fluid 12 due to frictional heat and high pressure generated between the introduction path 4 and the shoe block 5. Then, the plastic plastic fluid 12 raised to a certain pressure in the die chamber 6 flows toward the entrance of the die 7 as shown by an arrow B in FIG. 3 and is extruded from the die 7 as a copper flat wire 9. in this way,
According to the conventional extrusion molding apparatus, by rotating and driving the wheel 1, the copper material 3 can be continuously supplied to the introduction path 4 to perform extrusion molding without limitation.

[0005]

However, when an extruded product is continuously manufactured using this conventional extruder, the surface of the copper material 3 in the introduction path 4 is exposed to the atmosphere. In this state, heat is received by the shoe block 5 and the die chamber 6, so that copper oxide is generated in that portion. A part of this copper oxide can be collected as scrap called flash 11 during extrusion molding, but the other part is not collected and remains on the surface of the groove 2 to remove the wheel 1
When the copper material 3 is continuously drawn into the introduction path 4, the copper material 3 adheres to the surface of the copper material 3 and is brought into the die chamber 6. The copper oxide passes through the die 7 together with the copper plastic fluid 12 and is mixed into the extruded copper flat wire 9. Conventionally, the influence of the copper oxide brought into the die chamber 6 on the extruded product as described above has not been considered so much. However, recently, the copper oxide is deposited near the entrance of the die 7 and the deposit The formation of deep flaws on the surface of the extruded product by the deposits 13 is a major problem in quality.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to extrude a copper or copper alloy product capable of preventing the accumulation of oxide on a die and preventing the surface of an extruded product from being damaged. An object is to provide an apparatus and an extrusion molding method using the same.

[0007]

An apparatus for extruding a copper product according to the present invention includes a wheel having a groove on an outer peripheral surface, and a die chamber attached to the wheel and covering a portion extending over a predetermined length of the groove. A shoe block, having an introduction path formed between the wheel and the shoe block and introducing a copper or copper alloy material, wherein the copper or the copper alloy material is transferred by friction between the wheel and the shoe block. In the extrusion apparatus for a copper product to be heated and extruded, the groove is formed so as to periodically meander with an amplitude in the wheel width direction of 0.1 to 0.5 mm with the rotation of the wheel. It is characterized by the following.

According to the present invention, there is provided a method for extruding a copper product, comprising: a wheel having a groove on an outer peripheral surface; a shoe block having a die chamber attached to the wheel to cover a portion extending over a predetermined length of the groove; Heating the copper or copper alloy material by friction between the wheel and the shoe block using an extrusion molding apparatus having an introduction path formed between the wheel and the shoe block. In the method of extrusion-molding a copper product to be extrusion-molded, the groove is moved with the rotation of the wheel by 0.1
A step of periodically meandering with an amplitude in the wheel width direction of 0.5 mm to 0.5 mm.

In order to solve the above-mentioned problems, the present inventors have
As a result of intensive experimental research, in the conventional extrusion molding apparatus, in order to keep the yield of the flash 11 as low as possible and keep the yield high, the groove 2 hardly meanders.
For example, it has been found that copper oxide deposits are caused by being formed to have an amplitude of less than 0.1 mm.
That is, in the extrusion molding method using the conventional extrusion molding apparatus configured so that the groove 2 hardly meanders, the direction is switched by the abutment 8 and the die chamber 6 is switched.
A series of flows of the copper material that enters the room and is extruded from the die 7 at a high pressure in the room is substantially constant even though it may slightly change depending on the rotation cycle of the wheel 1. As a result, the copper oxide caught in the introduction path 4 flows at a substantially constant place, and is deposited at substantially the same place at the entrance of the die 7. In particular, it tends to accumulate at the position A (FIG. 3) at the center of the ceiling of the die 7. For this reason, in the extrusion molding of long and long copper products, even when the amount of copper oxide deposited is small at the initial stage of extrusion and the surface of the extruded product is good, the copper oxide is gradually removed over time. As the amount of deposition increases, large and deep scratches occur on the surface of the extruded product.

Therefore, in the present invention, the groove is meandered periodically with an amplitude of 0.1 to 0.5 mm,
Suppress the deposition of copper oxide at the same location in the die. As a result, even if a long and long copper product is manufactured by extrusion molding, scratches on the surface thereof are extremely unlikely to occur.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an apparatus and method for extruding a copper product according to the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a sectional view showing a relative positional relationship between a wheel 1a, a die chamber 6, and a die 7 in an apparatus for extruding a copper product according to an embodiment of the present invention.

In this embodiment, two grooves 2a meandering periodically in the wheel width direction are formed in the wheel 1a. The meandering amplitude of the groove 2a in the wheel width direction is 0.
1 to 0.5 mm. Other components are the same as those of the extrusion molding apparatus shown in FIG.

In the extrusion molding apparatus of the present embodiment configured as described above, the relative position of the portion where the abutment 8 of the groove 2a is inserted with respect to the entrance of the die chamber 6 with the rotation of the wheel 1a is determined. It fluctuates periodically. Accordingly, the flow of the copper plastic fluid 12 that enters the chamber of the die chamber 6 with the discharge direction switched by the abutment 8 constantly changes. As a result, the flow of the plastic fluid 12 in the die chamber 6 fluctuates, and the relative position with respect to the entrance of the die 7 through which the copper oxide taken therein flows also fluctuates. For this reason, it becomes difficult for the copper oxide to deposit at the entrance of the die 7. Therefore, even when a long and long copper product is extruded, scratches on the copper product surface due to the deposition of copper oxide are extremely unlikely to occur, and the surface properties are stable over a long period of time. Copper products can be manufactured.

If the meandering amplitude is less than 0.1 mm, there is almost no change in the flow of the plastic plastic fluid.
Copper oxide remains prone to deposit at the die entrance.
On the other hand, when the meandering amplitude exceeds 0.5 mm, a large amount of flash is generated, the yield is reduced, and wear and breakage of jigs and tools such as wheel grooves and abutments are increased. Therefore, the meandering amplitude of the groove is set to 0.1 to 0.5 mm.

As a copper product, by selecting a die, for example, a copper rectangular wire, a copper pipe, a copper segmental conductor wire, and the like can be extruded. It is not limited to.

Further, the present invention can be applied to extrusion molding of a copper composite material such as a copper-coated steel wire, and the number of copper materials as a raw material may be one or two or more. Alternatively, a plurality of copper products may be discharged from the die.

[0017]

EXAMPLES Examples of the present invention will be specifically described below in comparison with comparative examples that fall outside the scope of the claims.

First, an oxygen-free copper wire having a diameter of 12 mm (JIS C 1020) manufactured by a dip forming method, the surface of which is degreased and washed with a solvent, and the surface of which is removed by pickling, is supplied to an extrusion molding apparatus. Thus, a copper rectangular wire having a length of about 10,000 m was produced. As shown in Table 1 below, the meandering amplitude of the groove in each example was 0.1 m.
m, 0.3 mm or 0.5 mm, and the meandering amplitude of the groove in each comparative example was 0.08 mm. At this time, the cross-sectional shape of the copper flat wire of each of the examples and the comparative examples was changed as shown in Table 1 below by replacing the die.

[0019]

[Table 1]

Next, with respect to each of the copper rectangular wires, a position 100 m from the tip of the extrusion as an initial state of extrusion and 5000 m from the tip of the extrusion as an intermediate state of extrusion.
And the state of the end stage of extrusion, the extent of scratches on the surface was determined by observation using a loupe, observation of the cross-sectional shape, and the like at a total of three locations at 10,000 m from the extrusion tip. In the determination of the surface of the flaw, a product that was clearly acceptable as a product was rated as ○, a product that was barely acceptable as a product, and a product that was poor in quality was rated as x. The results are shown in Table 2 below.

[0021]

[Table 2]

As shown in Table 2 above, in Examples 1 to 9, the grooves having an appropriate amplitude were formed in the wheel, so that in each of the initial, middle and end stages of extrusion,
Flaws were hardly observed on the surface, and a very stable and good surface was obtained over the entire length. After the extrusion was completed, the extrusion molding apparatus was disassembled to check the state of copper oxide deposition on the die. As a result, no copper oxide was deposited on the die.

On the other hand, in Comparative Examples 10 to 12, the amplitude of the groove formed in the wheel was extremely small, and the plastic plastic fluid was introduced into the die chamber with a substantially constant flow and was discharged from the die. In the last stage and in the final stage, when any of the copper rectangular wires was manufactured, large and deep scratches occurred on the surface, and the product could not be manufactured. Therefore, the surface quality was unstable in the longitudinal direction. In addition, as a result of examining the state of copper oxide deposition on the die by disassembling the extrusion molding apparatus after the end of extrusion, a large amount of copper oxide was deposited at the entrance of the die.

[0024]

As described in detail above, according to the present invention,
Since the grooves formed in the wheel are meandered periodically with an amplitude of 0.1 to 0.5 mm, the copper oxide is prevented from being deposited at the same place on the die. As a result, even when a long and long copper product is manufactured by extrusion molding, it is possible to prevent the occurrence of scratches on the surface, and to manufacture a good copper product having stable surface properties in the longitudinal direction. be able to.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a relative positional relationship between a wheel 1a, a die chamber 6, and a die 7 in a copper product extrusion molding apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional extrusion molding apparatus.

FIG. 3 is a cross-sectional view (a cross-sectional view taken along line XX of FIG. 2) illustrating a relative positional relationship between a wheel 1 and a die chamber 6 and a die 7 in a conventional extrusion molding apparatus.

FIG. 4 is a sectional view taken along the line YY of FIG. 3;

[Description of Signs] 1, 1a; Wheel 2, 2a; Groove 3; Copper Material 4; Introductory Path 5; Shoe Block 6; Die Chamber 7; Dice 8; Abutment 9; Copper Flat Wire 10; Guide Roller 11; Thing 12; plastic fluid 13; sediment

Claims (2)

[Claims] 1. A shoe block including a wheel having a groove on an outer peripheral surface, a die block attached to the wheel and covering a portion of the groove over a predetermined length, and a shoe block formed between the wheel and the shoe block. An introduction path in which a copper or copper alloy material is introduced, having an extrusion molding apparatus for a copper or copper alloy product that extrudes and heats the copper or copper alloy material by friction between the wheel and the shoe block. The groove is formed so as to meander periodically with an amplitude in the wheel width direction of 0.1 to 0.5 mm with rotation of the wheel, and is formed by extrusion of a copper or copper alloy product. apparatus. 2. A shoe block having a groove on an outer peripheral surface, a shoe block provided with a die chamber attached to the wheel and covering a portion of the groove over a predetermined length, and formed between the wheel and the shoe block. An introduction path into which copper or copper alloy material is introduced, and a copper or copper alloy product obtained by heating and extruding the copper or copper alloy material by friction between the wheel and the shoe block using an extrusion molding apparatus having An extrusion method, comprising a step of periodically meandering the groove with an amplitude in the wheel width direction of 0.1 to 0.5 mm with the rotation of the wheel. Molding method.