JPH0573487B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention continuously extrudes materials such as aluminum, copper, lead, zinc, and magnesium to produce cotton materials,
The present invention relates to an apparatus for continuously manufacturing long products such as pipe materials, and in particular to a continuous extrusion apparatus using a conform method.

<Conventional technology> Long small aluminum materials in the electric wire industry,
For small diameter pipes, conventional flat wire,
In addition to fan-shaped conductors and the like, there has recently been a new demand for optical fiber protection spacers and the like. Even for general short products, production efficiency is often better for long products in the pre-processing process. However, in the conventional direct extrusion method, the length and weight are limited depending on the size of the billet (material), so the production efficiency is poor and it may not be possible to realize it.

Therefore, instead of the direct extrusion method, the conform method was used to extrude cotton materials, etc.
Conform extruders used for this purpose have also been invented, such as JP-A-47-31859 and JP-A-49-65369.
No. 1, Japanese Patent Publication No. 59-50410, etc., and is already known.

The configuration of this conform extruder will be briefly explained.

The conformal extruder has a rotating wheel having an endless groove on its outer circumferential surface, and a shoe fixed to a part of the outer circumferential surface of the wheel in close proximity to each other, and the groove and the shoe form a material conveyance path (first path). , and further includes a protruding receiving portion that closes one end of the passage, and a material extrusion port (second passage) that communicates with the passage and contains a die in the shoe.

The principle of extruding materials in such a conform extruder will be explained based on FIG. 12.

An endless groove 4 having a substantially U-shaped cross section is formed in the rotating wheel 2, and a shoe 3 is provided on the open side of the groove 4.
The inner circumferential surfaces 31 of the shoes face each other, and a passage 11 is formed by these grooves 4 and the shoe inner circumferential surfaces 31. A material 14 is forcibly fed into the passage 11.

The material 14 is one side different from the shoe 3 (the shoe inner peripheral surface 3
1), whereas it is in contact with the endless groove 4 on three sides (groove inner wall surfaces 41, 42, and 43).

Therefore, the contact frictional resistance on each contact surface is three times greater on the endless groove 4 side than on the shoe 3 side. At this point, the shoe 3 is fixed and the rotary wheel 2 is rotated. For example, if the wheel 2 is rotated in the direction of the arrow in FIG.
Since the frictional resistance of contact with the rotating wheel 2 is much greater, the material is continuously fed into the passage 11 in the direction of the arrow by the wheel.

If a material extrusion port (not shown) having a die is provided at the tip of the passage 11 beyond that, the material is extruded from this port and becomes a product such as a wire rod or a tube material of a desired shape.

In a conformal extruder having such a structure, when inserting the material into the first passage 11,
It is necessary to create a seal to prevent material from protruding between the shoe and the rotating wheel, and for this purpose, an improved version of the conformal extruder having the basic structure described above is used.

For example, a continuous extruder manufactured by Sumitomo Heavy Industries, Ltd. employs a seal structure shown in FIGS. 8 to 10. That is, as shown in these figures, the shoe 3 is provided with a shoe insert portion 5 that is inserted into the endless groove 4 of the wheel, and the gap distance d between the shoe inner peripheral surface 31 and the wheel outer peripheral surface 21 is equal to the second passage 6. (This is the material extrusion space, hereinafter referred to as "material extrusion port 6")
The gap between the shoe inner circumferential surface 31 and the wheel outer circumferential surface 21 is configured to become extremely small in the vicinity of the material extrusion port 6, as shown in FIG.

With this configuration, material can be extruded using the material extrusion port 6 or die 7 with a cross-sectional dimension wider than the width of the groove 4 (approximately equal to the width of the insert part), and the strength of the shoe insert part 5 can be increased. can also be secured in sufficient quantities.

However, in a material extruder with such a configuration, depending on the setting of the gap distance d, for example, when the rotating wheel 2 thermally expands, the wheel 2 and the shoe 3 come into contact and generate further heat, and furthermore, these tools may The disadvantage is that it wears out and shortens the life of the machine.

Furthermore, in order to achieve sufficient sealing, it is necessary to widen the area where the gap distance d is small, which also has the disadvantage of increasing the loss of driving force.

Further, as another structure of the continuous extruder, a typical structure example of one for which the applicant has already applied for a patent is shown in FIG. 11. In the example shown in the figure, in order to increase the diameter of the material extrusion port 6, the rotary wheel 2 is provided with a groove 4 for the material conveyance path and a groove 44 on which the wide shoe insert portion 5' is inserted. It is provided in two stages, and the gap distance d' between the side surface of the shoe insert portion 5' and the side surface of the groove 44 is made small to seal the material in this portion. However, even in an extruder having such a configuration, the lower end surface 51' of the shoe insert portion 5' and the groove 4
Material accumulates in the friction between the bottom surface of wheel 2 and shoe 3 (there is no sealing effect in this area).
There is a problem in that a large frictional force acts between the wheels, increasing the required driving force and increasing the temperature of the wheels etc. due to the friction.

Furthermore, since the sheath insert portion 5' receives internal pressure of the material in the direction of the arrow 17 in FIG. Since the width of the insert portion 5' must be made sufficiently large, the cause of the friction cannot be eliminated by narrowing the area where the material accumulates, so it is necessary to solve the above problem from a design perspective. I can't.

<Problems to be Solved by the Invention> An object of the present invention is to solve the above-mentioned drawbacks of the prior art and provide a structure that can reliably seal the material between the rotating wheel and the shoe, and which The object of the present invention is to provide a continuous extrusion device that causes less loss and can extend the life of the tool.

<Means for Solving the Problems> Such objects are achieved by the present invention described below.

That is, the present invention provides a rotating wheel having an endless groove formed on its outer circumferential surface, a shoe fixedly installed close to and facing a part of the outer circumferential surface of the rotating wheel,
a first passage for material conveyance formed by the groove and the inner circumferential surface of the shoe; an abutment (protruding receiving part) that closes one end of the first passage; and a first passage provided in the shoe and connected to the first passage. A continuous extrusion device having a die disposed in the middle of a communicating second passage for extruding material into a desired shape, characterized in that a recessed region is provided around the second passage on the inner peripheral surface of the shoe. A continuous extrusion device is provided.

The present invention also provides a rotating wheel having an endless groove formed on its outer circumferential surface, a shoe fixed to a portion of the outer circumferential surface of the rotating wheel in close proximity to each other, and the groove and the inner circumferential surface of the shoe. A first passage for material conveyance, an abutment (protruding receiving part) that closes one end of the first passage, and a second passage provided in the shoe and communicating with the first passage. In a continuous extrusion device having a die for extruding into a desired shape, a recessed region is provided around the second passage on the inner circumferential surface of the shoe, and a resistance means for preventing the material from extruding is provided in the recessed region. The present invention provides a continuous extrusion device with special features.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiments of the continuous extrusion apparatus of the present invention shown in the accompanying drawings will be described in detail.

FIG. 1 is a side view of the continuous extrusion apparatus 1 of the present invention, and FIGS. 2 and 3 are sectional views taken along the - line and - line in FIG. 1, respectively.

As shown in FIGS. 1 to 3, a continuous extrusion device 1
An endless groove 4 is formed on the outer peripheral surface 21 of the rotating wheel 2. The cross-sectional shape of this groove 4 is usually U-shaped, but the present invention is not limited to this.

On the other hand, the shoe 3 is the outer circumferential surface 2 of the rotating wheel 2.
1, that is, the inner circumferential surface 31 having approximately the same curvature.
The inner circumferential surface 31 is the outer circumferential surface 21 of the rotating wheel.
It is fixedly installed so that it closely faces a part of the.

As shown in FIGS. 1 and 2, a shoe insert portion 5 is provided in the shoe 3 so as to protrude along the inner peripheral surface 31 so as to correspond to the groove 4. It is inserted into the groove 4 to a certain depth. The gap distance d between the inner circumferential surface 31 of the shoe and the outer circumferential surface 21 of the rotating wheel gradually decreases from the material supply port 10 to the entrance of the second passage (material extrusion port) 6, which is the material extrusion space. Near the extrusion port 6, the gap distance d is extremely small, as will be described later. Therefore, while the height of the shoe insert section 5 is kept constant, the depth at which the shoe insert section 5 is inserted into the groove 4 is gradually deepened from the material supply port 10 toward the material extrusion port 6, or the height of the shoe insert section 5 is kept constant. By gradually reducing the height of the insert portion 5, the depth at which the shoe insert portion 5 is inserted into the groove 4 can be made constant.

In this way, the first passage 11 for conveying the material 14 is formed in the space surrounded by the groove 4 of the rotating wheel and the shoe insert part 5, and the material 14 is transferred to the material supply port as the rotating wheel 2 rotates. The material is continuously supplied from 10, passes through a first passage 11, and is extruded into a desired shape from a material extrusion port 6, which will be described later, through a die 7.

Examples of the material 14 used in the continuous extrusion device 1 of the present invention include wire rods of aluminum, copper, lead, zinc, magnesium, etc., or powders thereof. In this specification, a typical metal wire having a circular cross section will be described.

Note that the shoe insert portion 5 does not necessarily need to be provided on the shoe inner peripheral surface 31, and the first passage 11 may be formed by the shoe inner peripheral surface 31 and the groove 4 without providing this.

As shown in FIGS. 1 and 3, the shoe 3 includes a material extrusion port 6 at the downstream end of the first passage 11 communicating with the passage 11, and a first passage 1 in the vicinity thereof.
A protruding receiving part called an abutment 8 which closes the groove 4 and has a cross section substantially the same as the groove 4 is provided. As a result, the material flowing through the first passage 11 engages with the abutment 8, changes the direction of its flow, and is guided to the material extrusion port 6.

A die 7 is built into the material extrusion port 6, and the material is extruded into a predetermined shape by passing through the hole 71 of the die 7. Therefore, hole 7 of the die
By appropriately selecting the shape of 1, it is possible to extrude the material as a solid wire or hollow pipe material having a circular, elliptical, rectangular, triangular, or fan-shaped cross section, for example.

The direction of the material extrusion port (second passage) 6 can range from the tangential direction of the rotating wheel 2 (horizontal to the first passage 11) to the radial direction (perpendicular to the first passage 11), but due to the layout, It is preferable to provide it in the radial direction of the rotating wheel 2 and push out the material in this direction because it is convenient for handling.

In such a continuous extrusion device 1, the first passage 11 is not completely closed, and there is a gap between the rotating wheel 2 and the shoe 3, so it is necessary to seal it to prevent material from protruding from this gap. There is. Particularly in the vicinity of the material extrusion port 6, the internal pressure of the material is high, so as shown in FIGS. Seal the material by providing a

Furthermore, the most important feature of the present invention is that the material extrusion port (second passage) in the minimum gap distance region 12
A recessed region 9 is provided around the entrance of 6. By providing this concave region 9, the material fills in the concave region 9, increasing the protrusion resistance, increasing the sealing effect between the rotating wheel outer circumferential surface 21 and the shoe inner circumferential surface 31, and preventing the occurrence of burrs. Decrease.

Further, since a separating force acts between the rotary wheel 2 and the shoe 3 due to the internal pressure of the material filled in the recessed region 9, the shoe inner circumferential surface 31 and the rotary wheel outer circumferential surface 21 come into contact within the minimum gap distance region 12. Therefore, heat generation due to friction between these tools, loss of driving force, and wear of the tools can be avoided.

Furthermore, in the present invention, a resistance means is provided in the recessed region 9 to further increase the resistance to the protrusion of the material, thereby further enhancing the above-mentioned effects.

Here, as the resistance means for preventing the material from extruding out, it is preferable to use something like a narrow groove 13 that extends substantially concentrically from the entrance of the material extrusion port 6, as shown in FIG. However, the present invention is not limited to this, and any arrangement may be used as long as it can produce the same effect, such as thin grooves whose arrangement is different from that in FIG. 4, wavy unevenness, scattered protrusions, etc.

Note that there is a suitable range for the dimensions of the recessed region 9. That is, as shown in FIG. 3, when the width of the recess region is L and the depth of the recess is D, it is preferable that L/D≧6.

This is because by setting the dimensions in such a range, the resistance when the material protrudes increases, and the above-mentioned effects are further enhanced.

The loss of driving force is equal to the product of the area of the recessed region 9 and the shear deformation stress of the material. Therefore, if the area of the recessed region 9 is too large, the loss of driving force will increase.
Furthermore, if the area of the recessed region 9 is too small, the above-mentioned effects will not be fully exhibited, and in particular, the amount of burrs generated will increase.

Therefore, it is desirable that the area of the recessed region 9 be determined in consideration of the above points.

<Function> Hereinafter, the function of the continuous extrusion device of the present invention will be explained.

As shown in FIG. 1, the material 14 is tightly fitted into the endless groove 4 of the rotating wheel 2 at the material supply port 10, and when the rotating wheel 2 rotates in the direction of the arrow in the figure, the material 14 is transferred to the first passage. 11 is continuously supplied.

The state of the material 14 within the first passage 11 will be explained. FIG. 5 schematically shows the deformed state of the material 14 within the passage, and FIGS. 6 and 7 are cross-sectional views taken along the - line and - line in FIG. 5, respectively.

The state of deformation of the material 14 is different between the first-half region 15 and the second-half region 16 of the first passage. That is, in the first half region 15, as shown in FIG. 6, the material 14 is in a state in which it is in partial contact with the groove inner wall surfaces 41, 42, 43 of the rotary wheel 2 and the lower end surface 51 of the shoe insert part 5, The material 14 is gradually plastically deformed due to the frictional force corresponding to the difference between these contact surfaces, and the groove 4 is filled. In the latter half region, as shown in FIG. 7, the material 14 fills the groove 4 and the material and the inner wall surface of the groove come into contact with each other under strong pressure, so that pressing pressure is generated by the force due to the shear deformation resistance of the material.

Since the downstream end of the first passage 11 is blocked by the abutment 8, the material 14 that has flowed through the first passage 11 engages with this abutment 8, changes the flow direction, and flows into the material extrusion port 6. I am guided.

A die 7 is built in the material extrusion port 6, and the material 14 is squeezed out through a hole 71 of the die 7, and a product having a cross-sectional shape equal to the shape of the hole 71 is continuously extruded. This product is cooled, wound up into a coil, etc., and held.

Since the internal pressure of the material 14 is particularly high around the material extrusion port 6, a region 12 is provided in which the gap distance d between the shoe inner circumferential surface 31 and the rotating wheel outer circumferential surface 21 is minimized to ensure sealing of the material. Furthermore, in the present invention, a recessed region 9 is provided around the material extrusion port 6 in this minimum gap distance region 12, and this recessed region 9 is filled with the material 14. This increases the resistance of the material to protrude and enhances the sealing effect.
The occurrence of burrs is reduced.

Further, due to the internal pressure of the material filled in the recessed region 9, a separating force acts between the rotating wheel 2 and the shoe 3, thereby preventing contact between the rotating wheel outer circumferential surface 21 and the shoe inner circumferential surface 31. This avoids heat generation, loss of driving force, and wear of the tools due to friction between these tools.

When a resistance means such as a thin groove 13 is provided in the concave region 9, the material 14 is applied to this minute unevenness.
, and the protrusion resistance further increases, so that the above-mentioned effects are further enhanced.

<Effects of the Invention> According to the continuous extrusion device of the present invention, by providing the concave region on the inner peripheral surface of the shoe around the material extrusion port (second passage), the concave region is filled with material,
The resistance to material extrusion is increased, which improves the sealing effect between the rotating wheel and shoe, reducing the occurrence of burrs.

Furthermore, due to the internal pressure of the material filled in the recessed area, a separating force acts between the rotating wheel and the shoe, preventing contact between the rotating wheel and the shoe, thereby reducing heat generation due to wear between these tools. Loss of driving force and wear of tools can be avoided, extending the life of the equipment. Especially when a resistance means is provided in the recess area to prevent the material from protruding.
The resistance to extrusion of the material increases further, and the above effect becomes more pronounced.

[Brief explanation of the drawing]

FIG. 1 is a partial side view of the continuous extrusion apparatus of the present invention. 2 and 3 are cross-sectional views taken along the - line and - line in FIG. 1, respectively. Fourth
The figure is a side view showing the configuration near the material extrusion port (second passage) of the shoe. FIG. 5 is a schematic diagram showing the state of deformation of the material within the passage. Figures 6 and 7 represent the - line and - line in Figure 5, respectively.
FIG. FIG. 8 is a partial side view of a conventional continuous extruder. 9 and 10 are sectional views taken along the - line and - line in FIG. 8, respectively. FIG. 11 is a partial cross-sectional view of the vicinity of the material extrusion port of another configuration example of a conventional continuous extruder. FIG. 12 is a perspective view illustrating the principle of material extrusion in a general conform extruder. Explanation of symbols, 1... Continuous extrusion device, 2... Rotating wheel, 21... Rotating wheel outer peripheral surface, 3...
Shoe, 31... Shoe inner peripheral surface, 4... Endless groove, 41, 42, 43... Groove inner wall surface, 5, 5'
...Show insert part, 51, 51'...Show insert lower end surface, 6...Material extrusion port (second
passage), 7... die, 71... hole, 8... abutment (protruding receiving part), 9... recessed region, 1
0...Material supply port, 11...First passage, 12...
Minimum gap distance region, 13...muscle groove, 14...material, 15...passage first half region, 16...passage second half region, 17...material internal pressure direction.

Claims (1)

[Scope of Claims] 1. A rotary wheel having an endless groove formed on its outer circumferential surface, a shoe fixedly installed to closely face a part of the outer circumferential surface of the rotary wheel, and the groove and the inner circumferential surface of the shoe. The first for conveying the material to be formed
a passage; an abutment (protruding receiving part) that blocks one end of the first passage; and
A continuous extrusion device including a die disposed in the middle of a second passage communicating with the first passage for extruding material into a desired shape, wherein a recessed region is provided around the second passage on the inner peripheral surface of the shoe. A continuous extrusion device characterized by: 2. The continuous extrusion device according to claim 1, wherein the recessed region satisfies the relationship L/D≧6, where L is the width and D is the depth. 3. A rotating wheel with endless grooves formed on its outer circumferential surface, a shoe fixedly installed in close proximity to and facing a part of the outer circumferential surface of the rotating wheel, and a material conveying device formed by the groove and the inner circumferential surface of the shoe. 1st of
a passage; an abutment (protruding receiving part) that blocks one end of the first passage; and
A continuous extrusion device having a die disposed in the middle of a second passageway communicating with the first passageway and extruding material into a desired shape, comprising: providing a concave region around the second passageway on the inner peripheral surface of the shoe; A continuous extrusion apparatus characterized in that a resistance means for preventing material from protruding is provided in the recessed region. 4 The recessed region has a width of L and a depth of D.
The continuous extrusion device according to claim 3, which satisfies the relationship L/D≧6. 5. The continuous extrusion device according to claim 3 or 4, wherein the resistance means is a groove extending around the second passage.