JPS6057926B2 - material extrusion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an extrusion device using a movable wheel.
In particular, the present invention relates to a new extrusion device that can stabilize extrusion operations and stabilize the quality of extruded products.

An extrusion device for extruding a material using a single movable wheel having an endless groove is disclosed in, for example, Japanese Patent Application Laid-Open No. 47-318.
This method is already known as it was disclosed in Japanese Patent Application Laid-Open No. 50-6536.

The configuration of this extrusion device basically consists of a movable wheel having an endless groove on its circumferential end surface, and a movable wheel that is engaged with the circumferential end surface to form an elongated transport path for material between the groove and the movable wheel. It consists of a stationary shoe block having a protruding receptacle closing one end and having a die in or in a passageway near the receptacle, and means for feeding material into said passageway.

In this extrusion device, the material supplied to the passage is moved toward the die by obtaining part or all of the extrusion pressure due to contact frictional resistance with the groove caused by rotation of the wheel. In other words, the material supplied to the passage is subjected to contact frictional resistance acting in opposite directions from the stationary surface of the moving groove shoe block that forms the inner surface of the passage. Since the extrusion force is large, it acts strongly on the groove side, and as a result, the material receives part or all of the extrusion pressure due to frictional resistance with the groove and is moved toward the die. In a lever extrusion device, the machining conditions for the circumferential surface of the material in the channel are different on the groove side and the shoe block side, and as a result, the cross section of the material in the plastic deformation state is not uniform and the speed is It will be inclined to .

The above-mentioned processing conditions of the material during extrusion can cause physical properties to occur inside the extruded product, which may adversely affect the quality of the product and cause it to bend in one direction.

In addition, in this extrusion device, the pressure generation source for extrusion depends on the contact friction resistance between the material and the groove,
Since the extrusion mechanism is completely different from conventional ram type extrusion pressure, this device has several problems unique to it. Particularly problematic are extrusion pressure fluctuations due to gaps between the wheel and the material and the resulting non-uniformity of the resulting product. That is, as described above, the pressure generating mechanism is moved toward the die by obtaining part or all of the material and groove force.

However, in a lever extrusion device, 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 as a result, the state of plastic deformation of the material is not uniform in the cross section of the passage, and the speed is It will have a certain slope.

The above-mentioned processing conditions of materials during extrusion can cause differences in physical properties within the extruded product.
This can adversely affect the quality of the product and cause it to bend in one direction. In addition, in this extrusion device, the pressure generation source for extrusion depends on the contact friction resistance between the material and the groove, and the extrusion mechanism is completely different from that of conventional ram type extrusion devices. has some inherent problems.

Of particular concern are extrusion pressure fluctuations due to gaps between the wheel and the material and the resulting non-homogeneous product. In other words, as mentioned above, the pressure generation mechanism depends on the contact friction resistance between the material and the groove, but
The reality is that the adhesion between the material and the groove during the extrusion operation is not uniform and perfect over the entire contact surface, but varies from place to place or over time, resulting in so-called empty burrs.

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

Therefore, there is a risk of undesirable defective products such as non-uniform wall thickness, partial defects on the surface or inside, non-uniform adhesion at the bonding interface, etc., especially in products with strong demands for product integrity, such as vibrators and composite wires. . The inventors believe that although it is difficult to avoid the empty burrs in the movable wheel system, and therefore the generation of defective products, if a plurality of movable wheels are used, the occurrence of such defective products can be greatly reduced. We focused our attention on whether it would be possible to prevent this from occurring.

In other words, if there are multiple movable wheels, it is unlikely that all wheels will be emptied at the same time, and even if one wheel empties, the other wheels will supplement this and This is because it is possible to prevent the occurrence of defective products. The inventors filed an application for an extrusion device using a plurality of movable wheels in Japanese Patent Application No. 50-132736 (see Japanese Patent Publication No. 59-504W).

On the other hand, in addition to using a plurality of movable wheels, the inventors provided a plurality of endless grooves on the outer circumferential surface of the movable wheel, thereby forming a plurality of transport passages on the outer circumferential surface of the movable wheel. We considered extruding the materials for the transportation route in a unified manner. That is, the present invention has been made for the purpose of providing an extrusion device that eliminates the instability of extrusion operation caused by empty burrs and that can produce extremely sound extruded products with high efficiency. , an extrusion device using a movable wheel formed with an endless groove formed on the outer circumferential surface and a fixed shoe block that engages with the groove to form a transport path for extruding material, the endless groove being formed on the outer circumferential surface of the movable wheel. A plurality of transport passages are formed between the movable wheel and the fixed shoe block, and at the back of these transport passages, the respective materials are integrated in communication with each transport passage. A material extrusion device comprising a gathering chamber and a die for extruding the material from the gathering chamber.

Next, an embodiment of an extrusion device for the material of the present invention will be described based on the accompanying drawings.

FIG. 1 is an explanatory cross-sectional view showing how a material is extruded using an extrusion device according to the present invention.

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

The passages 13 and 13 are communicated with each other through collecting chambers 15 which are bent laterally from the end portions of the fixed shoe block 12 which are closed by the receiving portions 14 . 16 is a die provided in the collection chamber 15.

The arrows indicate the rotation of movable wheels 10 and 10, respectively. In the above, respective movable wheels 10 and 1
The fixed shoe blocks corresponding to 0 are each configured as one fixed shoe block 12 that is integrated into one,
Materials 17 and 17, for example linear aluminum metal, are fed into channels 13 and 13, respectively, and at the same time wheel 1
0 and 10 are each rotated in the direction of the arrow in the figure.

The materials 17 and 17 in the passages 13 and 13 obtain part or all of their extrusion pressure through the contact frictional resistance with the grooves 11 and 11 caused by the rotation of the wheels 10 and 10, respectively, as described above, and thereby is moved in the direction of the die. At the back of the channels 13 and 13, the two streams of materials 17 and 17 are combined in a collection chamber 15. The material 17 thus assembled and integrated is then transferred to the die 16.
A predetermined extruded product 18 is obtained.

Now, the extrusion behavior of the material is as described above, but in the device according to the present invention, a plurality of endless grooves are formed on the outer peripheral surface of the movable wheel, and a plurality of transport passages are formed between the movable wheel and the fixed shoe block. It is characterized in that the materials of each transport passage are collectively integrated at the back of the transport passage and extruded.

This can be explained using Fig. 2. Fig. 2 is a simplified version of Fig. 1, and when viewed from the upper side, it is easy to understand the structure of the device in which a plurality of endless grooves are formed on the outer peripheral surface of the movable wheel. This is what is shown.

According to FIG. 2, the two movable wheels 60 and 60 have two endless grooves 61, 61 and 61 on their outer peripheral surfaces, respectively.
, 61. Therefore, in this extrusion device, the two movable wheels 60 and 60 together with the fixed shoe block 62 form a total of four transport passages 63. 65 is a gathering chamber, and 64 is a die provided in the gathering chamber 65.

This extrusion device is essentially the same as that in FIG. 1, except that the movable wheels 60 and 60 are each provided with two endless grooves 61, 61. According to this extrusion device, as the number of endless grooves 61, 61 formed on the outer peripheral surface of the movable wheel 60 increases, the mechanical energy required for extrusion also increases, and a correspondingly large amount is applied to the fixed shoe block. However, since the two movable wheels are arranged outside the point where the force that tries to separate the fixed shoe block from the endless groove is concentrated, the support structure of the shoe block can be improved. The separation force of each shoe block immediately acts as a restraining force on the other wheel side, and the entire device can be made into a compact and highly efficient structure. By arranging the gathering chamber and the die, a more compact structure can be achieved.

As is clear from the above description, according to the extrusion device of the present invention, a plurality of transport passages are formed by a plurality of endless grooves formed on the outer peripheral surface of the movable wheel, and a gathering chamber is provided at the back of each transport passage. Since the extrusion pressure is also combined in the gathering chamber, even if the above-mentioned empty burrs occur in one transportation path, the materials are combined in the gathering chamber and extruded. The passages perfectly complement this, making it possible to always ensure stable extrusion pressure, and eliminate the aforementioned irregularities such as uneven wall thickness, partial defects on the surface or inside, and uneven adhesion at the bonding interface. It is possible to completely prevent the occurrence of non-defective products.

Moreover, even if a material with a small cross-sectional area is used as the material to be extruded, there is no interruption in the supply of material and there is no insufficient generation of extrusion pressure, making it possible to carry out extremely stable extrusion. Particularly at the time of start-up, it is possible to eliminate the situation of shortage of the supplied material and to smoothly change the pressure fluctuations leading up to extrusion. In particular, when the present invention is configured using a plurality of movable wheels, the apparatus can be assembled by taking into consideration mechanical variations due to the flow of the materials to be extruded.

In this case, the driving force for each movable wheel can be reduced, and a mechanically stable extrusion device can be constructed by pressing the fixed shoe block in cooperation with other movable wheels. . As described above, the present invention provides an extrusion device which eliminates the instability of extrusion operation caused by empty burrs, and which can produce extremely sound extruded products with high efficiency. The value is extremely great.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are explanatory diagrams of an embodiment of a material extrusion apparatus according to the present invention, respectively. 10, 60, 62: Movable wheel, 12: Fixed shoe block, 11, 61: Endless groove, 13, 63: Transport passage, 17: Material, 16, 64: Die, 15, 65: Collection chamber, 14: Receiving part , 18: Product.

Claims (1)

[Claims] 1 An extrusion device that uses a movable wheel formed by an endless groove formed on the outer circumferential surface and a fixed shoe block that engages with the groove to form a transport path for extruding material, the endless groove being formed on the outer circumferential surface of the movable wheel. A plurality of transport passages are formed between the movable wheel and the fixed shoe block, and at the back of these transport passages, the respective materials are integrated in communication with each transport passage. A material extrusion device comprising a gathering chamber and a die for extruding the material from the gathering chamber.