JPS6117568B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to an improvement of a continuous extrusion device using a movable wheel, and in particular, by making the extrusion pressure generated by frictional resistance constant, it is possible to adjust the extrusion pressure with less power loss. This invention relates to a continuous extrusion device with a novel structure that can perform efficient extrusion.

In a conventional continuous extrusion device using a movable wheel, the rotation speed of the movable wheel can be controlled by a drive mechanism, but there is no particular mechanism for adjusting the extrusion pressure. Therefore, the extrusion pressure fluctuates in the vicinity of the die. There is a problem. That is, FIG. 3a is a diagram schematically showing the deformation mode of the material supplied to the continuous extrusion device, and FIG. 3b shows the relationship between the length of the fixed shovel block and the extrusion pressure. The extrusion pressure increases in the direction of the die due to the accumulation of frictional forces, but
The deformation style is different between the l ₁ region and the l ₂ region. In the l ₁ area, the material to be supplied is in partial contact with the groove wall surface of the movable wheel and the engagement surface of the fixed shoe block, and due to the frictional force equivalent to the deduction of these contact surfaces, the feeding material at the tip of the l ₁ area is The material deforms plastically and fills the groove cross section. l In region ₂ , the supplied material and the wheel groove wall surface are in contact with strong pressure over the entire surface, so extrusion pressure is generated by the force due to the shear deformation resistance of the supplied material. Here, the formula for calculating the extrusion force is given as follows.

l Region ₁ : F ₁ = YW ² = 2W′l ₁ μY …(1) l Region ₂ : F ₂ = PW ² = 2Wl ₂ k …(2) l ₁ :l Length of region ₁ mm l ₂ :l Length of zone ₂ mm W: Groove width mm W' = Width of contact with material F ₁ = l Extrusion force in zone ₁ Kg F ₂ : l Extrusion force in zone ₂ Kg Y: Yield stress of material Kg/mm ² P: Extrusion pressure Kg/mm ² K: Shear deformation resistance Kg/mm ² μ: Friction coefficient From equation (2) above, the extrusion pressure is given by the following equation.

P=2l ² K/W (3) This shows that the extrusion pressure is determined geometrically in proportion to l ₂ .

By the way, as is clear from Figure 3a, l ₂ is l ₁
If l becomes longer, it will naturally become shorter, and if l ₁ becomes shorter, it will become longer. In other words, l ₂ changes as l ₁ changes. l ₁ is the length of the l ₁ area, and the l ₁ area starts from the state in which the supplied material is partially in contact with the groove wall surface of the movable wheel and the engagement surface of the fixed shoe block, so the frictional force is generated. is not stable, and its length can easily fluctuate depending on the situation in which frictional force is generated. Therefore, as the length of this l ₁ region changes, l ₂
will vary, and the extrusion pressure generated based on l ₂ will naturally also vary. As a result, the quality of the extruded material in the longitudinal direction is not uniform, and in extreme cases, the cross-sectional area of the extruded material may vary in the longitudinal direction. Particularly in the case of composite wires, this problem tends to occur due to the core wire speed.

In view of the above points, an object of the present invention is to make it possible to adjust the extrusion pressure efficiently with less power loss by making the extrusion pressure generated by the frictional force constant, and to make it possible to adjust the extrusion pressure efficiently. The object of the present invention is to provide a continuous extrusion device with a novel structure that can homogenize the quality in the longitudinal direction.

In other words, the gist of the present invention is to supply the material to be extruded into a long and narrow transportation passage by means of an endless groove provided on the peripheral end surface of a movable wheel and a fixed shovel block that engages with the endless groove, and as the movable wheel rotates. In a continuous extrusion device, an extrusion pressure is generated in the material by frictional resistance generated between the material and the inner surface of the groove, and the supplied material in a high-pressure state at the back is molded and extruded from a die, An escape hole is provided in the vicinity of a position where the supplied material plastically deforms in the transport passage, fills the cross section of the transport passage, and then undergoes shear deformation and starts generating extrusion pressure to allow a part of the material to escape to the outside. It is in.

Embodiments of the continuous extrusion apparatus of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings.

FIG. 1 shows the usage status of the continuous extrusion device according to the present invention, in which 1 is a movable wheel having an endless groove 2 on the peripheral end surface, 3 is engaged with the peripheral end surface of the movable wheel 1, and the endless groove of the movable wheel 1 is This is a fixed shovel block with an elongated transportation passage 5 formed between the two. The fixed shovel block 3 further has a receiving part 6 that closes one end of the transport passage 5, and a die 7 is provided near the receiving part 6. If the die 7 is provided in this way, the material (feed stock) 4 supplied to the transport passage 5 is extruded through the die 7 from the back of the transport passage 5. On the other hand, it is also possible to provide a side chamber dedicated to extrusion in the fixed shovel block 3 leading to the back of the transport passage 5, and to extrude the material from there by disposing a die in the chamber.

The movable wheel 1 is constructed of a single material or a combination of a plurality of disc-shaped materials.

The inner wall surface of the transport passage 5 is constituted by the inner surface of the endless groove 2 of the movable wheel 1 and the engagement surface of the fixed shoe block 3. Said endless groove 2
The surface area of the inner surface of is larger than the surface area of the engagement surface of the fixed shoe block 3. Therefore, the raw material 4 supplied into the transport passage 5 is pushed toward the back of the transport passage 5 by the frictional force caused by the contact with the endless groove 2 as the movable wheel 1 rotates. At this time, since the back of the transport passage 5 is blocked by the receiving part 6, the material 4, which has no place to escape, generates extrusion pressure due to the action of the frictional force described above.
When this extrusion pressure exceeds a certain value (usually referred to as extrusion pressure), the material 4 under high pressure is extruded from the die 7. This is the extrusion mechanism by the continuous extrusion device.

In the present invention, an escape hole 8 is provided in the transport path 5 of the extrusion device described above to allow a part of the material 4 to escape to the outside. This escape hole 8 communicates with the outside via the fixed shovel block 3. In FIG. 1, l is the length of the transport passage 5, l ₀
is the length of the region (extrusion grip) where the material 4 is in close contact with the inner surface of the transport passage 5 and extrusion pressure is generated by the force due to shear deformation resistance. Therefore, l−l ₀ is a region (primary・The length of the grip. Here, when the extrusion pressure is calculated according to the above equation (3), it is expressed by the following equation.

P=2l ₀ K/W P: Extrusion pressure Kg/mm ² K: Shear deformation resistance Kg/mm ² W: Groove width mm Here, the extrusion pressure P is determined based on the value of l ₀ .

That is, in the present invention, the relief hole 8 is located at a position where the material 4 plastically deforms in the transport passage 5 and fills the cross section of the transport passage 5, and then undergoes shear deformation and starts generating extrusion pressure. installed near the In reality, the relief hole 8 is located somewhat from the above position.
It is convenient to provide it at a location that enters the l ₀ region. By doing so, a part of the material 4 can always escape from the escape hole 8.

By doing so, the length of the initial plastic deformation region (l-l ₀ region) fluctuates depending on the generation of frictional force, but all the influence of this fluctuation is transferred to the material extruded from the relief hole 8. I can let you do it. As a result, the value of l ₀ after the relief hole 8 is always constant, and the maximum value of the extrusion pressure generated after the relief hole 8 is also constant because it is determined based on l ₀ from the above formula.

In order to easily release a portion of the material 4 from the escape hole 8, it is normally necessary to make the diameter of the escape hole 8 sufficiently larger than the diameter of the die hole.
Otherwise, the extrusion pressure generated in the material 4 at the position of the relief hole 8 is not yet high enough, so that the material will not easily come out from the relief hole 8.

Regarding the relief hole, in the conventional method, in order to adjust the extrusion pressure, it was thought that it was necessary to determine the length of the fixed shoe block corresponding to the length of _l0 and reset the extrusion device. According to this embodiment, the length of the fixed shoe block is kept constant (somewhat long), and the generated pressure can be easily adjusted by changing the size or position of the relief hole. It is possible.

FIG. 2 shows another embodiment of the invention. In FIG. 2, the extrusion device is constituted by two movable wheels 1a, 1b. The two movable wheels 1a, 1b engage with a fixed shovel block 3 arranged between them and form transport paths 5a, 5b, respectively, between them. The backs of each of the transport passages 5a and 5b are communicated with each other by a gathering room 9, and a die 7 is provided in the gathering room 9. 2a and 2b are the movable wheels 1, respectively.
Endless grooves a and 1b, and receiving portions 6a and 6b. In this embodiment, the core material 10 passes through the fixed shovel block 3 through the core material supply path 11 and the gathering chamber 9, and further passes through the die 7 at intervals. From this configuration, the second
The extrusion device shown in the figure functions as a composite wire manufacturing device, and a composite wire 12 is shaped and extruded from a die 7 in a gathering chamber 9.

In this embodiment, relief holes 8a and 8b are shown. The escape holes 8a and 8b exhibit the same effect as shown in FIG. 1 during extrusion. Furthermore, the relief holes 8a and 8b can make the extrusion pressure of the materials 4a and 4b generated in both wheels constant, respectively, so that the pressure balance between the wheels can be easily achieved. In the case of two wheels, the pressure balance between the wheels has conventionally been achieved by leaving the fixed shoe block in a state where it can be moved slightly, and by using the slight movement of the fixed shoe block.
However, it is not only technically difficult to move the fixed shoe block appropriately in response to the pressure difference between the wheels, but it also increases the occurrence of burrs as a whole, which poses a problem. In this sense, the presence of the escape holes 8a, 8b makes it extremely easy to construct an extrusion device with a plurality of wheels.

In addition, in FIGS. 1 and 2, the optimum extrusion pressure obtained by l ₀ varies depending on the extrusion ratio, the material of the feed material 4, the temperature, etc., so the relief holes 8, 8a, It is necessary to change the size or position of 8b.

As described above, according to the continuous extrusion device of the present invention,
By providing an escape hole to allow part of the material to escape to the outside near the position where the supplied material plastically deforms in the transport passage, fills the cross section of the transport passage, and then undergoes shear deformation and starts generating extrusion pressure. Since the maximum value of the pressure required for extrusion can be determined in advance, it is efficient with less power loss when adjusting the extrusion pressure, and it also eliminates fluctuations in the extrusion pressure near the die, making it easy to maintain a constant value. Of course, it is possible to obtain the extruded material which is homogeneous in the longitudinal direction easily.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the continuous extrusion device of the present invention, Fig. 2 is an explanatory diagram of another embodiment of the present invention, and Fig. 3a schematically shows the deformation mode of the feed material of the continuous extrusion device The illustrated diagram, FIG. 3b, is an explanatory diagram showing the relationship between the length of the fixed shovel block and the extrusion pressure. DESCRIPTION OF SYMBOLS 1... Movable wheel, 2... Endless groove, 3... Fixed shoe block, 4... Supply material, 5... Transport passage, 6... Receiving part, 7... Die, 8... Escape hole, 9
...Gathering room, 10... Core material, 11... Core material supply path.

Claims (1)

[Scope of Claims] 1. An elongated transportation path is formed by an endless groove provided on the peripheral end surface of the movable wheel and a fixed shovel block that engages with the endless groove, and a material to be extruded is supplied into the transportation path, Extrusion pressure is generated in the material due to frictional resistance generated between the material and the inner surface of the groove as the movable wheel rotates, and the supplied material in a high pressure state is extruded from the die. In the continuous extrusion device, the material to be supplied plastically deforms in the transport passage, fills the cross section of the transport passage, and then undergoes shear deformation and a part of the material is transferred to the outside near the position where extrusion pressure starts to be generated. A continuous extrusion band characterized by having an escape hole. 2. The continuous extrusion device according to claim 1, characterized in that the escape hole is provided so as to communicate with the outside via a fixed shovel block. 3. Claims 1 or 2 characterized in that the fixed shub block is provided with a core material supply path in order to manufacture a composite wire by supplying the core material into the material under high pressure. continuous extrusion equipment.