JPS6035209B2 - Method of extruding material using multiple rotating wheels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in extrusion methods for extruding materials using rotating wheels.

As shown in FIG. 10, the endless groove 3 of the wheel 2 attached to the drive shaft 1 and the shoe 4 form a transport passage for feeding the material 7, and a receiving part 5 for the material 7 and extrusion molding are formed at the back of the transport passage. For example, a method of extruding material from a die 6 provided with the die 6 is known as
It is disclosed in Japanese Patent Laid-Open No. 49-6536y and is well known.

In this extrusion method, the pressure generation source for extrusion is
This method depends on the contact friction resistance between the material 7 and the endless groove 3, and the extrusion mechanism is completely different from the conventional ram type extrusion method, so this method has several problems unique to it.

Particularly problematic are fluctuations in extrusion pressure due to slippage between the wheel and the material and the resulting non-uniformity of the product. In other words, as mentioned above, the pressure generation mechanism depends on the contact friction resistance between the material and the groove.
The reality is that the adhesion between the material and the groove during extrusion is not uniform and perfect over all contact surfaces, but varies from place to place or over time, resulting in so-called slippage.

When moving objects using this type of frictional force, it is inevitable that some degree of instability will occur.

Therefore, for example, in pipes and composite wires where product integrity is particularly required, uneven wall thickness, partial defects on the surface or inside, etc.
There is a risk of undesirable defective products due to non-uniform adhesion at the bonding interface.

The inventors believe that although it is difficult to avoid early slippage in the rotating wheel system and therefore the generation of defective products, if a plurality of rotating wheels are used, the occurrence of such defective products can be greatly reduced. We focused on whether this could be deterred.

In other words, if there are multiple movable wheels, it is unlikely that all wheels will slip at the same time, and even if one wheel slips, the other wheels will compensate for this, and this will cause the wheel to slip. This is because it is possible to prevent the occurrence of defective products. However, although it is understandable that multiple rotating wheels can be used, as already explained, it requires a unique structure to firmly fix the shoe, and the mechanism and structure for generating extrusion pressure are also different from the ram type extrusion method. Since they are completely different and the behavior of the materials is also completely different, the method of using multiple rams in the conventional ram extrusion method cannot be applied at all to the rotating wheel method.

In other words, due to the rotating wheel method, a special extrusion method had to be developed, which was a major technical problem. How difficult it is to solve this problem is that, although extrusion methods using rotating wheels have been proposed for a long time, there have been no proposals for extrusion methods using multiple wheels prior to this application. This is understandable since it is not. The inventors conducted a detailed analysis of the structural mechanics unique to the unique structure of the rotating wheel extrusion method, as well as the plastic mechanical behavior of the material based on that analysis, and as a result of intensive studies, the inventors discovered that the rotating wheel extrusion method However, by selecting the movement direction of the extruded material to a certain specific position and direction, it is possible to use multiple wheels to extrude a sound extrudate in an extremely efficient manner.The entire device is also compact. I discovered that it is possible to That is, the extrusion method according to the present invention changes the number of wheels by employing a step of changing the direction of movement of the material in which extrusion pressure is generated in each wheel from the circumferential direction of the wheel to the semi-longitudinal direction of the wheel. Even with an increase in This aims to provide an extrusion method in which even if pressure fluctuations occur in that wheel, the extrusion pressure in other wheels can supplement this and the extrusion pressure in the pressure chamber can always be kept stable. The gist of this method is to prepare a plurality of rotating wheels each of which has endless grooves provided on its outer circumferential surface and fixed shoe blocks that engage with the grooves to form a material transport path, and to rotate each wheel. By rotating the material and feeding the material into the transport passage depending on the contact friction resistance between the material and the endless groove, the material is caused to advance in a first direction that is the circumferential direction of the wheel and extruded into the material. Generate pressure, change the direction of the material in a second direction that is the radial direction of the wheel near the point of maximum pressure generation of the extrusion pressure, and guide the direction-changed material into a common pressure chamber to combine. , a method of extruding a material using a plurality of rotating wheels that extrude the material from the chamber through a die.

The egg details will be explained below using examples. FIG. 1 is an explanatory cross-sectional view showing how a material is extruded by applying the extrusion method according to the present invention.

In FIG. 1, movable wheels 10 and 11 are arranged close to each other on the same plane, respectively, and are endless grooves provided on the peripheral end surfaces of the movable wheels 10 and 10, respectively. 12 is a fixed shoe lock which is engaged with the circumferential end surfaces of the movable wheels 10 and 10, respectively, and forms elongated transport passages 13 and 13 for the material between the grooves 11 and 11.

The passages 13 and 13 are closed by a receiving part 14 of the fixed shoe lock 12. For extrusion,
Materials 17 and 17, for example linear aluminum metal, are fed into the passages 13 and 13, respectively, and at the same time the wheel 1
0 and 10 are each rotated in the direction of the arrow in the figure.

Materials 17 and 17 in passages 13 and 13 are formed by grooves 11 and 1 created by rotation of wheels 10 and 10, respectively.
Part or all of the extrusion pressure is obtained by contact frictional resistance with the wheels 10 and 1, whereby the materials 17 and T7 are moved in the circumferential direction of the wheels 10 and 10, which is the first traveling direction, and the extrusion pressure is generated inside the wheels 10 and 10. pressure is generated. The pressure distribution of the materials 17 and 17 in the passages 13 and 13 is therefore not uniform, being small at the entrance of the passages and reaching a maximum value at the depths of the passages.

That is, Fig. 11 is an analytical diagram of the pressure distribution on the passage, and the length of the contact arc between the material and the wheel Jo =
900, the case is shown in which the diameter of the wheel is 25 mm, the diameter of the extruded material is 1 mm, and the coefficient of friction is 0.1.

In the vicinity of the maximum pressure generation point of this pressure, the material 17
and 17 are caused to change direction from the first traveling direction to the radial direction of the wheels 10 and 10, which is the second traveling direction. In the single wheel system of the subordinate type, as shown in Fig. 10, a die 6 is arranged at the receiving part 5, which is the point where the maximum pressure is generated, and the material 7 that hits the receiving part 5 is immediately extruded from this die 6. However, with such a configuration, there is no design margin anywhere, and it is unthinkable to use multiple wheels. An innovative feature of the present invention is that the radially deflected materials 17 and 17 are introduced into a common pressure chamber 15 and are combined together within the pressure chamber 15.

The combined materials in the pressure chamber 15 are maintained under pressure, but since the materials 17 and 17 are changed in direction near the point where the maximum pressure occurs, the pressure is always the highest compared to when the materials are changed in direction elsewhere. is maintained. Materials 17 and 17 redirected in such a state
is no longer constrained by the rotating castles of the wheels 10 and 10, and receives only the transmission of extrusion pressure from the material in the first direction, and attains a state in which it can freely move in any direction.

In this way, even if the number of wheels increases, as long as there is space to appropriately combine and arrange the wheels, it becomes possible to arrange the wheels themselves with a free arrangement design as appropriate, and material can be easily extruded using multiple wheels. It is possible. FIGS. 2 to 9 are specific examples showing how flexible the arrangement of wheels can be in realizing the extrusion method according to the present invention.

Although these examples clearly show that the extrusion method according to the present invention allows flexibility in selecting the number of wheels and their shape, it is possible that there are various other specific examples. Needless to say.

According to the extrusion device shown in FIG. 2, two movable wheels 19 and 19 arranged side by side in a plane are arranged with a step provided in the axial direction.

From this, it can be seen that the elongated second direction passages 22 and 22 formed between the grooves 20 and 20 and the fixed shoe lock 21, once turned in the radial direction of the wheel, are further It is redirected laterally and is incorporated into the pressure chamber 23 at the point where it bends laterally. According to the extrusion device shown in FIG. 3, the movable wheels 25 and 25 are arranged so that their axes, once crossed, are further perpendicular to each other.

In this figure, 26 is a fixed shoe. 27 In the diagram, 26 is a fixed shoe. Tsuku, 27 and 27
29 is an endless groove, 29 is a pressure chamber, and 30 is a die. According to the extrusion device shown in FIG. 4, the movable wheels 31 and 31 are arranged so that their respective axes intersect. In this figure, 32 is a fixed shoe lock, 33
and 33 are endless grooves, 34 and 34 are passages in the second direction, 35 is a pressure chamber, and 36 is a die.
Further, according to the extrusion device shown in FIG. 5, the two movable wheels 37 are arranged radially with an interval of 120° between each other and their axes intersect with each other. The fixed shoe lock 38 is arranged to hold the respective material moving in the second direction between the three grooves 39 of the wheel 37 which are arranged to engage the circumferential surfaces of the three wheels 37 as shown. A transportation path 40 is formed for the purpose. A pressure chamber 42 with a die 41 is in a position to divide the material in the three passages. According to the extrusion device shown in FIG.
The four movable wheels 43 are arranged radially with adjacent axes intersecting each other at intervals of 900 degrees.

Further, the four movable wheels 43 have fixed shoe locks 44 positioned between their opposing circumferential end surfaces, as shown in the figure. The pressure chamber 46 with the die 45 is the location of the material flow in the four passages 49 in the second direction formed between the four grooves 47 of the wheel 43 and the shoe lock 44.

According to the extrusion device shown in FIG.
The grooves 61 and 60 are formed by two grooves 61 and 6 on the respective Oka green surfaces.
1 and 61,61.

From this, the fixed shoefu. Together with the locks 62, four passages 63 are formed. 64 is a die provided in the pressure chamber 65.

Also, an extrusion device as shown in FIGS. 8 and 9 is conceivable.

The arrow in the figure indicates the rotation direction of the movable wheel. According to the extrusion device shown in FIG. 8, a fixed shoe lock 73 is arranged between two movable wheels 74, 74.

Materials 75, 75 are fed into respective passages 74' from opposite sides of this shoe hook 73, are combined in a pressure chamber 76, and are extruded from a die 77. According to the extrusion device shown in FIG. 9, a fixed shoe lock 78 is arranged with two movable wheels 79, 79 arranged inside.

Materials 80 and 8 streams are supplied to the passage 81 from the outside of wheels 79 and 79, which are opposed to each other on their circumferential surfaces, respectively. Comparing Figures 8 and 9, it is clear that the extrusion direction is freely set in the front, back, left, and right. The basic feature is that it employs a unique process of converting the circumferential direction of the wheel to the radial direction of the wheel near the point of occurrence. As a result, {1} Even if multiple rotating wheels are used, a condition can be created in which multiple materials in each wheel can be easily introduced into one pressure chamber, and the materials can be combined into one body within the pressure chamber. It became extremely easy.

'2' By adopting a geometric configuration that covers the imaginary line in the radial direction of the wheel that changes the direction of the material, the most stable arrangement relationship can be achieved when combining multiple wheels, and the entire device can be High efficiency and compactness can be achieved.

'3} Since the position where the direction is changed and returned from each wheel is near the maximum pressure generation point of the material, the pressure of the combined materials in the pressure chamber also receives the transmission of the maximum pressure, and the extrusion efficiency as a whole always increases. Maximum efficiency can be maintained.

'4' Since each material is combined in a common pressure chamber under the maximum pressure condition, even if pressure fluctuations occur due to idle slippage in one wheel, the same pressure will be applied to the other wheels at exactly the same time. As long as no slipping occurs, the pressure within the pressure chamber will not fluctuate and will continue to maintain a constant, stable pressure.

As a result, there is no risk of unevenness in the extruded product, and the risk of defective products such as non-uniform wall thickness, partial defects on the surface or inside, and non-uniform adhesion at the bonding interface is completely eliminated. This makes it possible to always obtain sound extruded products with high efficiency. {5} If there are a plurality of foils, the energy for extrusion increases by the number of foils.

Therefore, if the rotation of the wheel is the same, it will contribute to increasing the extrusion speed, and if high speed is not required, the rotation of the wheel can be reduced, which can significantly extend the life of the wheel. It can exhibit a number of excellent effects that have not been seen before, and its industrial significance is truly great.

[Brief explanation of drawings]

FIG. 1 is an explanatory sectional view showing a state in which the extrusion method according to the present invention is being implemented, and FIGS. 2 to 9 are explanatory diagrams showing specific examples of the arrangement of wheels when implementing the extrusion method according to the present invention. , FIG. 10 is an explanatory sectional view showing the extrusion situation using a conventional single wheel, and FIG. 11 is a diagram showing the pressure distribution in the transportation passage. 10, 19, 25, 31, 37, 43, 50, 56, 6
0,74...Movable wheel, 12,21,26
, 32, 38, 44, 48, 52, 58, 73, 78・
...Fixed shuffle lock, 11, 20, 27, 3
3, 39, 47, 51, 57, 61...endless groove,
13, 22, 28, 34, 40, 49, 53, 59, 6
3,81...transportation passage, 17,75,80...
...Material, 16, 24, 30, 36, 41, 45,
54, 64, 77...Die, 15, 23, 29
, 35, 42, 46, 55, 59', 65, 76...pressure chamber, 14...receiving section, 18...
··product. Figure 8 Figure 9 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 10 Figure 11

Claims (1)

[Claims] 1. Prepare a plurality of rotary wheels each having an endless groove provided on the outer circumferential surface and a fixed shoe block that engages with the groove to form a material transport path, and rotate each wheel to transfer the material. Depending on the frictional resistance of contact with the endless groove, the material is fed into the transport path to advance in a first direction, which is the circumferential direction of the material wheel, to generate extrusion pressure on the material, and to extrude the material. The material is deflected in a second direction, which is the radial direction of the wheel, near the point where the maximum pressure is generated, and the deflected material is guided into a common pressure chamber to be combined, and from the chamber is passed through a die. A method of extruding material using multiple rotating wheels.