JPS6150051B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an advantageous method for manufacturing a composite filament, which has no limit on the length of the material and can be manufactured indefinitely.

Conventionally, methods for manufacturing composite striatum include:
There is an extrusion method in which a composite core material and a cylindrical outer layer material are put into a container of a high-pressure ram press and extruded from behind. Alternatively, there is a method in which the outer layer material is formed by extrusion coating a billet housed in a container of a high-pressure ram press on the circumference of the core material.

According to these, the core material can be extended to an infinite length by extending it outside the container of the high-pressure ram press, but the size of the outer layer material is limited by the capacity of the container. Ru.

Therefore, when producing long objects such as filaments, it is necessary to periodically stop the large extrusion equipment and replenish or reinject the material, which makes it necessary to increase the individual extrusion speed. However, there is a major disadvantage in that there is a limit to the improvement in production speed.

Also, there is a drawback that the extruded product has seams.

Furthermore, according to this method, when the billet, which is the raw material to be extruded, is pressed from behind, friction occurs between its circumferential surface and the wall surface of the container, but this friction is of a different magnitude at the front and back of the billet. Because of this difference, when extruding by replenishing or re-feeding billets as described above, the billets fed earlier and billets fed later are intermittently in the extrusion state depending on their respective feeding positions. There is a disadvantage that the quality of the product is uneven in terms of physical properties because of the different physical properties.

On the other hand, prior to the present invention, there is a continuous extrusion method that utilizes frictional resistance, as seen in JP-A-47-31859 and JP-A-49-65369.

Since this method generates extrusion pressure using mechanical friction as the driving force, the state of the extrusion pressure is not constant and is significantly unstable compared to the case of a ram press. To briefly explain the state of each extrusion pressure by comparison, there is a significant difference in that the method using frictional resistance uses dynamic pressure, while the ram press uses hydrostatic pressure. Moreover, in such an extrusion method, one surface (the groove of the movable wheel) that makes up the container rotates at high speed, and the other stationary surface (the fixed shoe block) rotates at high speed.
A slight gap is required between the two, and in addition, internal pressure is applied to the material to try to open this gap, so as the gap increases, more burrs are generated.
Furthermore, in the extrusion method described above, since the mechanical friction that generates the extrusion pressure is inherently unstable, it is expected that slippage will occur in the material.

For this reason, there is great concern as to whether or not the extrusion pressure can be raised sufficiently with the extrusion method described above.For this reason, when manufacturing a composite wire using the above method, the first thing to do is to increase the extrusion pressure. The biggest concern was whether sufficient adhesion to the core wire could be obtained in connection with the lack of adhesive strength.

There was also concern about whether stable extrusion pressure could be generated in response to problems such as extrusion profile, extrusion size, and wire breakage.

Furthermore, there was also a concern that the die slippage would cause interruptions in the supply of material, particularly at the start-up stage of extrusion, and accompanying fluctuations in extrusion pressure (reduction in extrusion pressure).

Therefore, in producing a composite wire using such a continuous extrusion method, the main focus of development was to ensure stable adhesive strength with the core wire in view of the above.

Regarding the application of such a continuous extrusion method to composite wire manufacturing, considering the conventional method of using a large-capacity billet as the material to be extruded and extruding it hydrostatically using a ram press, it was initially difficult to imagine. I didn't have to worry about it. This is clear from the fact that the use of such a continuous extrusion method was initially developed for wire drawing by extrusion.

Further, according to such a continuous extrusion method, the material supplied to the material transportation passage corresponding to a conventional container is transported in opposite directions from the moving groove and one side of the fixed shovel block, which constitute one side of this passage. However, since the surface area of the groove is larger than that of the shoe block, this frictional resistance acts strongly on the groove side, and as a result, the material loses part of its extrusion pressure due to the frictional resistance with the groove. Or you can get all of them and move them towards the die. Therefore, the machining conditions for the circumferential surface of the material in the passage are different on the groove side and the shoe block side, and related to this, the state of plastic deformation of the material that accompanies flow is the same in the cross section of the passage. The result is a large slope in terms of speed. To explain this in an easy-to-understand manner, the 10th to
As shown in Figure 12. FIG. 10 shows the velocity distribution state of the material flow, FIG. 11 shows the action state of the internal shearing force of the material, and FIG. 12 shows the state of the material flow itself.

The processing details of such materials during extrusion may cause differences in the physical properties inside the material, which may have an adverse effect on the quality of the product, such as subtle unevenness or directionality. Therefore, countermeasures for this point are also necessary.

In view of the above, it is an object of the present invention to make it possible to continue manufacturing indefinitely without any restrictions on the amount and length of the material, and to produce long, uniform extruded products by ensuring stable adhesion to the core material. The object of the present invention is to provide a method for manufacturing a composite striatum based on a novel idea.

That is, the gist of the present invention is to provide a method for manufacturing a composite filament by forming an outer layer material on the periphery or a part of the core material by extrusion coating, in which the material to be extruded as the outer layer material is applied to the periphery of a movable wheel. The wheel is rotated by continuously supplying the material through the opening into a long and narrow transportation passage formed between the endless groove provided above and the engaging surface of the fixed shoe block, one end of which is closed and the other end of which is open. Due to the contact frictional resistance between the grooves generated by the rotation of the wheel and the material to be extruded, the material to be extruded is fed into the depths of the transport passage, and at the same time, part or all of the extrusion pressure is obtained, By providing a side chamber at the back of the groove that changes direction from within the groove, the flow direction of the material to be extruded is changed, and the flow state of the material to be extruded is changed from a dynamic pressure state to a hydrostatic state, and this hydrostatic pressure A method for manufacturing a composite filament body, which comprises combining the core material drawn into the side chamber and the material to be extruded under a controlled condition, and then extruding the composite material from a die.

Further, the gist of the present invention is characterized in that, in the above, the movable wheels are constituted by a plurality of groups, and the materials supplied to each transport passage are collected in a side chamber that communicates with each other at the back of each transport passage. The present invention relates to a method for producing a composite striatum.

Next, embodiments of the method for manufacturing a composite filament of the present invention will be described with reference to the accompanying drawings.

The extrusion device shown in the reference example in FIG. 1 includes a movable wheel 11 having an endless groove 10 on the peripheral end surface,
A fixed shovel block 14 is engaged with the peripheral end surface of the wheel 11 and forms a transport passage 13 for the outer layer material 12 between it and the groove 10. The wheel 11 can be constructed from a combination of one or three disc materials.

The shovel block 14 has a receiving portion 15 that closes one end of the passage 13, and this receiving portion 15
A die 16 is provided in a part of the block, and a core material supply passage 17 communicating with the passage 13 is provided on the opposite side of the block from the die 16.
has. The core supply channel 17 is formed with a straight path so that the core 18 can move directly through the die 16. 19 is a nipple provided facing the passage 13.

As the core material 18, for example, a filament made of steel is used. Further, as the outer layer material 12, a long material made of, for example, aluminum metal is used.

The inner surface of the passage 13 of this extrusion device is the wheel 11
groove 10 and the shoe block 1 related to this groove 10
Furthermore, the surface area of the groove 10 on the inner surface of the passage 13 is larger than the surface area of the corresponding surface of the shoe block 14. Therefore, the outer layer material 12 in the channel 13
groove 1 by rotating the wheel 11 in the direction of the arrow.
The structure is such that a part or all of the extrusion force is obtained by stronger contact frictional resistance generated between the roller and the roller.

Here, when looking at the plastic deformation state of the outer layer material 12 supplied to the passage 13 with reference to FIGS. 10 to 12,
First, the speed distribution of the outer layer material 12 is determined by the speed distribution of the movable wheel 11
As shown in FIG. 10, there is a significant speed difference between the shaft and the fixed shovel block 14. As a result, the value of the internal shearing force acting on the outer layer material 12 naturally increases as shown in FIG. The flow becomes complicated. As a result, a very large shear acts on the entire circumference of the core material 18 as shown in FIG. 11, and this has a significant effect on the adhesion between the core material 18 and the outer layer material 12. This is a natural result of metallurgy.

Next, looking at the specific extrusion operation shown in Figure 1, the extrusion pressure is 50 to 60 kg/mm ² and the wheel 1
1 in the direction of the arrow, the aluminum outer layer material 12 is preheated to 300 to 350°C and supplied into the passage 13, and further heated to 300 to 450°C from the core material supply passage 17.
When the core material 18 of steel preheated to 18°C is inserted and supplied through the die 16 with the passage 13 in between, the outer layer material 12 is held in a predetermined position by the contact frictional resistance with the groove 10 caused by the movement of the wheel 11. , and moves through the passage 13. The outer layer material 12 and the core material 18 are connected to the passage 1, as is clear from FIG.
3, where they are composited together and extruded from a die 16 to form a composite wire body 20, commonly referred to as an aluminum covered wire.

Next, regarding the embodiments of the present invention shown in FIG. 2 and subsequent figures, the reference numerals in FIG. 1 are used as they are for those structurally the same as those in FIG. 1, and the explanation will be simplified.

The extrusion device shown in FIG.
A side chamber 2 that changes direction laterally from within a groove formed on the peripheral end surface of the movable wheel 21 is located at the back of a passage 23 formed between the movable wheel 21 and the fixed shovel block 22.
4, and furthermore, at the entrance of this side chamber 24, there is a dividing fluid 25 as shown in FIG.

Here, from the passage 23 to the side chamber 24, the outer layer material 1
Looking at the change in the state of extrusion pressure caused by the flow of 2, in a passage, the state of extrusion pressure is dynamic pressure because mechanical friction is used as the driving force for its generation. On the other hand, in the side chamber 24, the extrusion pressure is considerably improved due to the change in direction of the flow of the outer layer material and the loss of energy required to reach this point, and becomes static pressure. However, even here, a certain degree of internal shear action still remains, and it can be said that the adhesive action described previously is exerted here as well. As a result, when the core material 18 is passed through the passage 23, it alone exhibits a remarkable adhesive effect;
Because the extrusion pressure is dynamic (the extrusion pressure is not steady and unstable), problems with eccentricity and uneven thickness are observed.
In this case, the problem of eccentricity and uneven thickness can be solved under relatively good bonding conditions.

This was confirmed in Figures 13 to 15. Figure 13 shows a cross section of the passage 13 when the core material 18 is passed through the core material using the method shown in Figure 1. do.

On the other hand, in Fig. 14, the core material 18 is removed by the method shown in Fig. 2.
This method is referred to as B. In addition, in method B, the second
There is no separate fluid 25 as shown in the figure. Here, when looking at the thickness unevenness ratio of the composite wire (aluminum-coated steel wire) obtained by each method as shown in Fig. 15, in method A, the thickness unevenness band is 10~
in the 90% range, whereas the average is 50%.
In method B, the thickness unevenness band ranges from -5 to 50%, with an average of 20%. From this, method A cannot obtain a thickness unevenness of 0, whereas method B
It can be seen that the method described above significantly improves the thickness unevenness rate.

Next, to explain the action of the dividing fluid 25 from an actual extrusion operation, when the outer layer material 12 that moves with the rotation of the wheel 21 reaches the back of the passage 23, it receives a reaction from the receiving part 26 and its flow is changed direction and bent to reach the side chamber 24. At this time, the flow of the outer layer material 12 becomes two flows divided by the action of the dividing fluid 25, and these two flows have respective flow pressures that are equal to the overall flow pressure relative to the core material 18 located in the center of the side chamber 24. The flows are collected from both sides of the core material 18 so as to be dynamically balanced. This further improves the problems of eccentricity of the core material and uneven thickness of the outer layer material, and the core material 18 and the outer layer material 12 are combined and extruded from the die 16.

Instead of the structure shown in FIG. 3 of the divided fluid 25, the structure shown in FIG. 4 can be considered. That is, this structure provides two grooves 27 and 27 on the peripheral end surface of the wheel 26 to form two passages 28 and 28, respectively, and integrates these two passages 28 and 28 in a side chamber 29 similar to that described above. At the same time, the spacer walls 29 of these passages 28 and 28 act as a fluid divider 30. The extrusion device shown in FIG. 5 is basically made up of two movable wheels 31 and 31 placed close to each other, and the wheels 31 and 31 have endless grooves 32 and 32 on their peripheral end surfaces, respectively. Fixed shovel blocks 33 positioned in engagement with the circumferential end surfaces define transport passages 34 and 34 for the outer layer material 12 between said grooves 32 and 32, respectively. The transport passages 34 and 34 are
At the back of each passage, side chambers are provided which change direction laterally from inside the grooves 32 and 32 and communicate with each other.

This side chamber is called a gathering chamber 35, and the opening of the core material supply path 36 and the die 37 are located linearly opposite each other on both sides, and both passages 34 to this gathering chamber 35
The inflow movement of the outer layer materials 12, 12 from the outer layer materials 12 and 34 is performed by joining the core material 18 located at the center of the collection chamber 35 so as to sandwich it from both sides.

By arranging the two movable wheels 31, 31 in this way, the problems of eccentricity and uneven thickness can be further improved, and the core material 18 and the outer layer material 12 can be ideally combined and extruded from the die 37. That will happen.

According to this extrusion device, wheels 31 and 3
1 are rotated in opposite directions in the directions of the arrows, so that they work together to advance the extrusion operation.

Other embodiments of the extrusion device according to the present invention in which two movable wheels are disposed close to each other are shown, for example, in FIGS. 8 and 9, respectively. The extrusion devices shown in FIGS. 8 and 9 are each shown with a cross section relative to the axis of the wheel.

In the extrusion device shown in FIG. 8, two movable wheels 38 and 38 having the same diameter are arranged close to each other with their axes coincident with each other, and a fixed shovel block 39 is arranged so as to straddle the peripheral end surfaces of these wheels.
is placed.

Passages 41 and 41 consisting of endless grooves 40 and 40 formed on the peripheral end surfaces of wheels 38 and 38, respectively, are provided with collecting chambers 42, which are side chambers similar to those shown in FIG. It is aggregated and extruded. Reference numeral 43 is provided as a fluid divider and has the same function as described above. On the other hand, the extrusion device shown in FIG. 9 has two movable wheels 44 and 44 arranged with their axes orthogonal to each other and their circumferential end surfaces located close to each other as shown in the figure, and a fixed shoe block 45 engages with each of the circumferential end surfaces. are mated to form passages 47 and 47 between grooves 46 and 46, respectively.

These passages 47 and 47 also have a gathering chamber 48 as a side chamber at the back of each of them.

As is clear from FIGS. 8 and 9, the extrusion direction in relation to the die position is completely free. The extrusion device shown in FIG. 6 shows another embodiment of the present invention, and the extrusion device shown in FIG.
The extrusion process is basically the same as that of the apparatus shown in FIG. 1 or 2, except that the extrusion direction is reversed. According to this, the outer layer material 12 moves in the passage 50 as the wheel 49 rotates in the direction of the arrow, and at the back of the passage 50 it changes direction from the receiving part 51 and enters the side chamber 52. A die 16 is integrated with the core material 18 fed from the receiving part 51 side and is provided on the surface of the chamber 52 on the opposite side of the receiving part 51.
to form a predetermined composite filament 20.

In this extrusion device, the receiving portion 51 is separate from the fixed shovel block 53, and from this it can be seen that the receiving portion can be used in combination with the shovel block body. 54 is a fluid division.

Although the illustrated embodiments are all about composite wires, the present invention is also applicable to long composite plates.

In this case, one of the composite plates may be used as a core material and the other as an outer layer material.

According to the method for manufacturing the composite filament of this embodiment, by using a continuous extrusion method that utilizes frictional resistance, an infinite supply of materials with small cross-sectional areas such as wires, rods, and granular materials to be extruded is possible. There is no limit to the length of the core material and outer layer material, making it possible to continue manufacturing indefinitely and significantly improving productivity. By exhibiting an excellent adhesive effect, it is possible to obtain a composite filament with sufficient adhesive force and less eccentricity and uneven thickness.

In addition, in the above method, if the flow of the material to be extruded is constituted by a plurality of transport paths formed by a plurality of movable wheels or a plurality of endless grooves, it is possible to use a material with a small cross-sectional area as the material to be extruded. It is possible to perform extremely stable extrusion without discontinuing the material or generating insufficient extrusion pressure, and it is possible to obtain even extruded products with little physical directionality despite the use of friction. can. During start-up, even if material slips in one movable wheel or endless groove, it is compensated for by the other movable wheel or endless groove, thereby eliminating the shortage of supplied material and reducing pressure fluctuations leading to extrusion. It can be made to move smoothly. Also,
When a plurality of movable wheels are provided, the generation of burrs can be effectively suppressed by arranging the other movable wheels in the direction in which the force that causes the fixed shoe block to move away from the movable wheel is applied by extrusion.

In addition, in the above method, by combining the material to be extruded and the core material in the gathering chamber, which is a side chamber at the back of the transportation passage, the interruption of the supply material and especially the stabilization of the extrusion pressure state can be further reduced. This makes it possible to form a coating layer of uniform thickness on the periphery of the core material with sufficient adhesion.

Furthermore, if multiple movable wheels are used,
Extrusion can be performed in consideration of the mechanical balance due to the flow of the materials to be extruded. In this case, the driving force for each movable wheel can be reduced.

As described above, the present invention breaks through the conventional extrusion processing concept, has no limitations on the amount and length of the material, can be manufactured indefinitely, and can obtain products with stable material properties. It provides a manufacturing method for composite wire conditions based on a new idea, and its industrial value is extremely great.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of one embodiment of the method for manufacturing the composite filament of the present invention, FIG. 2 is an explanatory diagram of an embodiment of another configuration related to the present invention, and FIG. 3 is an enlarged cross section taken along line A-A' in FIG. 2. 4 is a cross-sectional view of the main part of an extrusion device according to the present invention, FIG. 5 is an explanatory diagram of an embodiment of another configuration according to the present invention, and FIG. 6 is an explanatory diagram of an embodiment of another configuration according to the present invention. 7 is an enlarged sectional view taken along line B-B' in FIG. 6, FIGS. 8 and 9 are explanatory diagrams of embodiments of other configurations according to the present invention, and FIGS. 10 to 12 are flowcharts of the outer layer material, respectively. The 10th
The figure is a diagram of the velocity distribution of the outer layer material, Figure 11A is a diagram of the internal shear force acting on the outer layer material, Figure 11B is a sectional view taken along line B-B' in Figure 11A, and Figure 12A is the outer layer A state diagram showing the flow pattern of the material, Figure 12 (b) is the first
It is a sectional view taken along line CC in Figure 2A. Figure 13 and 1
FIG. 4 is a partial sectional view of the inner part of the passage, and FIG. 15 is an explanatory diagram based on actually measured values regarding the thickness unevenness ratio. 11, 21, 31, 38, 44, 49: Movable wheel, 14, 22, 33, 39, 45, 53:
Fixed shoe block, 10, 27, 32, 40,
46: Groove, 13, 23, 28, 34, 41, 4
7,50: Passage, 24,52: Side chamber, 35,4
2, 48: Meeting room, 15, 26, 51: Receiving part,
12: outer layer material, 18: core material, 20: composite striatum,
16, 37: Die, 17, 36: Core material supply path, 2
5, 30, 43, 54: fluid division.

Claims (1)

[Scope of Claims] 1. In a method of manufacturing a composite filament by forming an outer layer material on the periphery of a core material or a part thereof by extrusion coating, the material to be extruded as the outer layer material is placed on the periphery of a movable wheel. The feed is continuously supplied from the opening to a long and narrow transport passage formed between the endless groove provided in the holder and the engaging surface of the fixed shoe block, one end of which is closed and the other end of which is open, and the wheel is rotated. Due to the contact frictional resistance between the grooves and the material to be extruded, which are generated by the rotation of the wheel, the material to be extruded is fed into the depths of the transportation passage, and at the same time, part or all of the extrusion pressure is obtained, and the By providing a side chamber in the back that changes direction from within the groove, the flow direction of the material to be extruded is changed, and the flow state of the material to be extruded is changed from a dynamic pressure state to a hydrostatic state, and this hydrostatic pressure A method for manufacturing a composite filament body, characterized in that the core material drawn into the side chamber and the material to be extruded are composited under the above-mentioned conditions, and then this composite is extruded from a die. 2. A composite filament body according to claim 1, which is composed of a plurality of movable wheels, and the materials supplied to each transport passage are collected in a side chamber that communicates with each other at the back of each transport passage. Production method.