JPH10244564A - Injection molding machine equipped with shearing heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine suitable for high speed vulcanization, which internally heats a material between an injection apparatus and a material extruder simply and safely to raise the temp. of the material. SOLUTION: A shearing heating apparatus 3 is integrally provided between a material extruder 1 and an injection apparatus 2 and a valve mechanism 7 opened when a material is extruded to the injection apparatus 2 and closed when the material is injected by the injection apparatus 2 to exert no injection pressure on the shearing heating apparatus 3 is provided to the passage provided between the shearing heating apparatus 3 and the injection apparatus 2 and the shearing heating apparatus 3 is constituted of the cylinder 3a arranged between the material extruder 1 and the injection apparatus 2 in a communication state and the mandrel 3C arranged in a rotatable manner so as to provide a gap 5 with respect to the inner wall 3b of the cylinder 3a and applying shearing to the molten material extruded from the material extruder 1 by rotary operation to raise the temp. of the molten material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine suitable for high-speed vulcanization, comprising a shear heating device between a material extruding device and an injection device.

[0002]

2. Description of the Related Art In a conventional external pre-plastic injection molding machine, especially for those using rubber or the like as a raw material, a material is supplied to a screw portion, and a material extruded from a screw tip after being plasticized by kneading is checked in a pot portion. It is generally transferred through a valve. As a method of performing high-speed vulcanization, UHF
However, there is known a method of mounting the nozzle portion immediately before injection in any of the methods, the Joule heating method, and others.

[0003]

However, the injection pressure 18
At a pressure as high as 00 kgf / cm ² or more, there is a problem in that the allowable pressure resistance of a pipe or the like through which a resin passes is limited and the life is shortened.

Accordingly, the present inventors have conducted intensive studies and as a result,
Attention was paid to a means for increasing the temperature of a molten material by providing a shear heating device having a structure similar to a so-called shear head, which is installed in a head portion of an extruder, between an injection device and a material extrusion device.

Further, in this type of injection molding machine comprising a material extruding device and an injection device, an upwardly inclined flow path is connected to a cylinder tapered surface of the injection device.
By feeding the molten material from the extruder toward the remaining material remaining on the tapered surface so as to hit it, a unique effect of flowing the remaining material on the tapered surface and eliminating problems such as thermal decomposition due to the retention. Can be obtained. In such a case, a switching valve is disposed in the flow path immediately before the injection device, and the flow path in the switching valve is provided so as to communicate with the inclined flow path. It was easy to invite. In this way, when the communication flow path is made long, the effect of arranging the shear heating device between the injection device and the material extruding device as described above is likely to cause the possibility of cooling of the molten material that has been heated and melted, and as described above. It will fade.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to easily and safely generate a material from the inside between an injection device and a material extruding device. An object of the present invention is to provide an injection molding machine suitable for high-speed vulcanization in which the temperature is increased by heating. In addition, by preventing the backflow of the molten material at the time of injection and preventing the high injection pressure applied at the time of injection by the injection device from reaching the shear heating device side, the overall life is prolonged, and the injection is performed without fear of cooling the heated molten material. It is an object of the present invention to provide an injection molding machine capable of effectively and easily shortening a flow path between a device and a shear heating device.

[0007]

In order to achieve the above-mentioned object, the technical means of the present invention is to integrally provide a shear heating device between a material extruding device and an injection device, and to provide a shear heating device. In the flow path provided between the injection device and the injection device, a valve mechanism that opens when the material is extruded into the injection device, closes when the material is injected by the injection device, and that does not apply the injection pressure to the shear heating device side is configured. The above-mentioned shear heating device is rotatably disposed with a gap provided between a cylinder that is communicated between a material extruding device and an injection device and an inner wall of the cylinder, and the material extruding device is rotated by the rotation operation. And a mandrel which gives a shear to the molten material extruded from and raises the temperature.

[0008] Further, a shear heating device is integrally provided between the material extruding device and the injection device, and the shear heating device is provided with a cylinder disposed in communication with the material extruding device and the injection device, and A mandrel that is rotatably arranged with a gap provided between the inner wall of the cylinder and a shearing operation to apply a shear to the molten material extruded from the material extruder by the rotation of the mandrel to increase the temperature; A flow path provided between the injection device and the injection device is provided so as to be inclined upward toward the tapered surface of the injection device, and is provided with a valve mechanism in the flow path. And a housing provided with a sliding hole for the switching valve, wherein the switching valve communicates with the valve sliding hole and communicates with the outer surface of the housing to communicate with the shear heating device side. One channel A downstream first flow path communicating with the valve sliding hole and communicating with the housing outer surface and communicating with the injection device side is provided, and the downstream first flow path is provided to be inclined upward from the side of the communicating valve sliding hole. The switching valve is made to face the cylinder taper surface of the injection device, and the switching valve is configured to be slidable in a valve sliding hole of the housing. An upstream second flow path provided from the outer surface of the valve body to the inner surface of the valve body at the same angle as the angle, and having the same angle as the downstream first flow path of the housing in communication with the upstream second flow path. And a downstream second flow path provided in an upwardly inclined shape from the inside of the valve body toward the outside surface of the valve body, and the switching valve slides in a valve sliding hole in the housing. Switchable between the communication state and the non-communication state of the flow path. It is that they are.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Although the figure shows a vertical type as one embodiment of the injection molding machine of the present invention, it is merely an example and can be appropriately changed to a horizontal type within the scope of the present invention.

In FIG. 1, reference numeral 1 denotes a material extruding device, 2 denotes an injection device, and a shear heating device 3 is provided between the material extruding device 1 and the injection device 2.

The shear heating device 3 is rotatably provided by providing a gap 5 between a cylinder 3a communicated between the material extruding device 1 and the injection device 2 and an inner wall 3b of the cylinder 3a. And a mandrel 3c for applying a shear to the molten material extruded from the material extruder 1 by the rotation operation to raise the temperature. The dimension adjustment of the gap 5 can be appropriately changed.

The shear heating device 3 connects the distal end side of the cylinder 3a to a valve mechanism 7 provided between the shearing heating device 3 and the injection device 2, and also causes the screw distal end 1a of the material pushing device 1 to face the mandrel 3c. They are orthogonal.

The rotation of the mandrel 3c is performed by a well-known rotation mechanism 4, and is not particularly limited. Further, the rotation speed and shape of the mandrel 3c are also arbitrary, and a material delivery screw portion may be provided in a part of the mandrel. In this case, the adjustment and setting of the pitch of the screw portion are also performed by the material component. It is set arbitrarily according to various conditions such as. In addition, the overall dimensions (cylinder 3a and mandrel 3c) of the shear heating device 3 are not limited to those shown in the drawings, but may be set arbitrarily long and short. It should be noted that the illustrated rotating mechanism 4 is merely an example, and it goes without saying that other general mechanisms used in such a rotating mechanism of a mandrel are also applicable.

The valve mechanism 7 opens when the material is extruded into the injection device 2, closes when the material is injected by the injection device 2, and does not apply injection pressure to the shear heating device 3. In this embodiment, the valve mechanism 7 has a specific configuration as shown in the figure. However, as long as it has a configuration for achieving the above object, a well-known switching valve mechanism or check valve mechanism ( Ball or needle), and is not particularly limited.

The material extruding device 1 and the injection device 2 have a general configuration in this type of injection molding machine, and a description thereof is omitted in this specification, but is not particularly limited to the illustrated example. Other general structures can be appropriately changed within the scope of the present invention.

Therefore, according to the above configuration, the screw 1a
The molten material sent from the material extruding device 1 into the shear heating device 3 through the above is mechanically sheared by the rotation of the mandrel 3c in the gap 5 in the heating device 3 and is heated. Then, the valve mechanism 7 arranged in the flow path between the shear heating device 3 and the injection device 2 is opened, and the heated molten material is sent out into the injection device 2. Then, the molten material fed into the injection device 2 is injected into a mold by the injection plunger 2c of the injection device 2. At the time of this injection, the valve mechanism 7 is closed, so that the high injection pressure applied at the time of injection does not reach the shear heating device 3 at all. Therefore, the pressure applied to the shear heating device 3 is only a low extrusion pressure applied when the molten material is sent to the injection device 2 side.

In the present embodiment, the upwardly inclined flow path is connected to the cylinder tapered surface 2b of the injection device 2, and the molten material is sent out so as to hit the remaining material remaining on the tapered surface 2b. Therefore, a special valve mechanism 7 as shown in the figure is adopted.

The valve mechanism 7 includes a housing 8 and a switching valve 24 inserted through the housing 8.

The housing 8 is disposed between the distal end side of the cylinder 3a of the shear heating device 3 and the tapered surface 2b above the nozzle 2a of the injection device 2, and the housing 8 is a box-shaped housing. A main body 9, a cylindrical switching valve sliding hole 15 formed through the left and right outer surface walls 10, 11 of the housing main body 9, and front and rear of the housing main body 9 in communication with the switching valve sliding hole 15. An upstream first flow path 18 and a downstream second flow path 31 are formed so as to penetrate the outer surface walls 12 and 13, respectively.

The shape of the housing body 9 is such that it can be arranged between the tip end side of the cylinder 3a of the shear heating device 3 and the tapered surface 2b above the nozzle 2a of the injection device 2.
The shape is not limited as long as it has a shape.

The first upstream flow path 18 is connected to the cylinder 3 a of the shear heating device 3 from the side face 16 of the switching valve sliding hole 15.
It is provided so as to be orthogonal to the front outer wall 12 opposite to and communicates with it, and the flow path end 19 of the flow path 18 communicates with the distal end side of the cylinder 3 a of the shear heating device 3.

The downstream first flow path 21 is provided with the injection device 2.
The side surface 1 facing the position of the side surface 16 where the upstream first flow path 18 of the switching valve sliding hole 15 communicates toward the upper inclined surface 14 of the rear outer surface wall 13 opposed to the tapered surface 2b.
7 is provided in an upwardly inclined shape and communicates with each other. The flow path end 22 of the flow path 21 communicates with the tapered surface 2 b of the injection device 2.

The switching valve 24 is slidably inserted into the switching valve sliding hole 15.

In the figure, reference numeral 33 denotes a temperature control hole.

The switching valve 24 is connected to the housing body 9.
A valve body 25 formed in a cylindrical shape that can slide and rotate in the switching valve sliding hole 15, and an upstream second through hole formed through the left and right outer surfaces 26 and 27 of the valve body 25. The flow path 28 and the downstream second flow path 31 are provided.

The upstream second flow path 28 is provided in the housing 8.
From the valve body outer surface 26 toward the inside of the valve body 25 so as to be on the same axis as the upstream first flow path 18, and the outer surface side opening 29 has a valve sliding hole in the upstream first flow path 18. It is provided with a diameter that matches the side opening 20.

The downstream second flow path 31 communicates with the distal end 30 of the upstream second flow path 28 provided in the valve body 25 and has the same inclination as the downstream first flow path 21 of the housing 8. It is provided in an upwardly inclined shape toward the valve body outer surface 27 at an angle, and the outer surface side opening 32 is provided in the downstream first flow path 2.
It is provided with a diameter that matches the one valve slide hole side opening 23.

Thus, the inclined flow path (flow path composed of the downstream first flow path 21 and the downstream second flow path 31) that goes upward to the tapered surface 2 b of the injection device 2 and the shear heating device 3 side The switching valve 24 is provided at a junction 37 between the connected flow paths (the flow path including the upstream first flow path 18 and the upstream second flow path 28).

The lengths and diameters of the flow paths 18, 21, 28 and 31 are not particularly limited.
As long as the flow of the molten material is not hindered, it is preferable to make the length of each flow path as short as possible, so that the entire size of the housing 8 can be reduced. It is preferable.

In the figure, reference numeral 34 denotes a device for rotating the switching valve 24. The switching valve 24 is opened or closed by a cylinder rod 36 disposed between the device body 35 and the switching valve 24. The rotation is performed so that The illustrated switching valve rotation device 34
Is merely an example, and it goes without saying that other general devices used in such a rotary switching valve are also applicable.

Accordingly, the housing 8 is disposed between the shear heating device 3 and the injection device 2 and the flow path end 19 of the upstream first flow path 18 in the housing 8 is connected to the shear heating device 3.
The shear heating device 3 and the injection device 2 are connected by causing the upper inclined surface 14 of the housing 8 to communicate with the tapered surface 2b of the injection device 2 by facing the cylinder 3a side of the injection device 2.

When the switching valve 24 inserted through the switching valve sliding hole 15 of the housing 8 is rotated in either direction by the switching valve rotation device 34, the upstream side of the valve 24 Outer surface side opening 32 of second flow path 28
And the opening 20 on the valve sliding hole side of the first flow path 18 on the upstream side of the housing 8 coincides with the opening 32 on the outer surface side of the second flow path 31 on the downstream side of the valve 24 and the first flow path on the downstream side of the housing 8. Since the opening 21 coincides with the opening 23 on the valve sliding hole side, the shear heating device 3 and the injection device 2 communicate with each other, and the molten material flows from the shear heating device 3 side to the flow path of the valve mechanism 7. Through the tapered surface 2 b of the injection device 2.

Further, the switching valve 24 is rotated from the above-mentioned valve open state, and the valve slides between the outer side opening 29 of the upstream second flow path 28 of the valve 24 and the upstream first flow path 18 of the housing 8. The hole side opening 20 and the downstream second flow path 3 of the valve 24
1 and the valve slide hole side opening 23 of the downstream first passage 21 of the housing 8 are completely displaced from each other. Are not in communication with each other and there is no backflow of the molten material.

In the present embodiment, the switching valve 24 is described as being rotatably disposed in the switching valve sliding hole 15 of the housing 8.
May be slid so as to move forward and backward in the switching valve sliding hole 15 to open and close the valve.

That is, the switching valve 24 arranged to be able to move forward and backward in the switching valve sliding hole 15 of the housing 8 is
The sliding operation is performed in any of the front and rear directions, and the upstream second flow path 28 of the switching valve 24 is connected to the upstream first flow path 1 of the housing 8.
8, and the downstream second flow path 31 of the switching valve 24 is connected to the downstream first flow path 21 of the housing 8, respectively, so that the flow path between the shear heating device 3 and the injection device 2 is brought into communication, Further, by any sliding operation of the switching valve 24 in the front-back direction, the upstream second flow path 2 of the switching valve 24 is
8 and the first upstream flow path 18 of the housing 8, and the second downstream flow path 31 of the switching valve 24 and the first downstream flow path 21 of the housing 8 are respectively shifted in the front-rear direction so that the flow path is not You may comprise so that it may be in a communication state.

In the case where the switching valve is provided so as to be able to move forward and backward, the switching valve and the valve sliding hole provided in the housing are such that the switching valve can move forward and backward within the valve sliding hole. The shape is not limited to a columnar shape as shown in the embodiment as long as they are formed in corresponding shapes as described above. For example, a desired shape such as a prismatic shape can be appropriately selected and is arbitrary.

[0037]

According to the present invention, since the molten material sent from the material extruder can be mechanically sheared to increase the temperature by using the above-mentioned structure, the compounding agent can be used as in the UHF method. It is possible to provide an injection molding machine suitable for high-speed vulcanization, which can easily and safely raise the temperature from the inside of a molten material sufficiently without causing a problem that careful attention must be paid to the dispersion of the material.

According to the UHF method, 1800
Since the injection pressure of kgf / cm ² or more is applied to the vicinity of the injection port, a load is applied to the resin passage pipe and the waveguide (high-frequency transmission pipe) provided at the injection port. And a material extruding device, and in the flow path between the injection device and the shear heating device, the valve opens when the material is extruded into the injection device, and closes when the material is injected by the injection device, and is closed to the shear heating device side. If the apparatus is provided with a valve mechanism or the like that does not exert an injection pressure, there is no fear that such a high injection pressure affects the heating device side, and as a result, the life of the entire injection molding machine can be extended.

Further, according to the UHF method, it is necessary to provide a cooling device depending on the magnetron capacity. However, according to the structure of the present invention, the material can be heated from the inside without the need to provide a cooling device, so that the cost can be reduced. Can also be planned.

In the case of a configuration having an inclined flow path that is inclined upward from the shear heating device side to the tapered surface of the injection device, the flow passage communicated from the shear heating device side together with the arrangement of the shear heating device. If a valve mechanism specific to the present invention is provided at the position of the junction, the junction can be provided integrally within the switching valve, so that the entire flow path is shortened and the flow path is melted due to the long flow path. There is no fear of cooling the material. Therefore, the unique configuration of the present invention including the shear heating device between the material extruding device and the injection device can be sufficiently exhibited.

Conventionally, the above-mentioned junction is formed in a large housing. However, the present invention does not form the junction in such a large housing. Finish workability is good and easy.

Conventionally, a housing having a switching valve and a housing having an inclined flow path have a two-part structure.
Although it was conceivable to provide a junction at the joint surface of the two housings, the present invention employs a configuration in which the junction is provided in the valve body. There is no place where material retention occurs.

Further, in the present invention, since the switching valve type is used, the material flow path (area) can be sufficiently obtained, and there is no backflow, that is, the variation in measurement can be reduced, so that the finished product effect is extremely high.

Further, by configuring as in the present invention,
Since there is no distortion, the temperature control hole provided in the housing of the switching valve mechanism can be made large and effective, and the temperature control efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional front view showing a part of an injection molding machine of the present invention.

FIG. 2 is an enlarged longitudinal sectional front view of a main part in a flow path communicating state.

FIG. 3 is an enlarged vertical cross-sectional front view of a main part in a non-communicating state of a flow path.

FIG. 4 is a cross-sectional plan view of the valve mechanism.

FIG. 5 is an exploded perspective view of a valve mechanism.

[Explanation of symbols]

 1: Material extrusion device 2: Injection device 2b: Tapered surface 3: Shear heating device 3a: Cylinder 3b: Inner wall 3c: Mandrel 5: Gap 7: Valve mechanism 8: Housing 15: Switching valve sliding hole 18: Upstream first flow Road 21: Downstream first flow path 24: Switching valve 28: Upstream second flow path 31: Downstream second flow path 37: Confluence point

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Morio Hashizume

Claims (2)

[Claims] 1. A shear heating device is integrally provided between a material extruding device and an injection device, and is opened when a material is extruded into the injection device through a flow path provided between the shear heating device and the injection device. A valve mechanism is provided that is closed when the material is injected by the injection device and does not apply an injection pressure to the shear heating device side, and the shear heating device is arranged in communication between the material extrusion device and the injection device. And a mandrel that is rotatably disposed with a gap between the cylinder and an inner wall of the cylinder, and that rotates the molten material extruded from the material extruding device by shearing to raise the temperature. An injection molding machine equipped with a shear heating device. 2. A shear heating device is integrally provided between a material extruding device and an injection device, wherein the shear heating device includes a cylinder disposed in communication between the material extruding device and the injection device, A mandrel that is rotatably arranged with a gap provided between the inner wall of the cylinder and a shearing operation to apply a shear to the molten material extruded from the material extruder by the rotation of the mandrel to increase the temperature; A flow path provided between the injection device and the injection device is provided so as to be inclined upward toward the tapered surface of the injection device, and is provided with a valve mechanism in the flow path. And a housing provided with a sliding hole for the switching valve, wherein the switching valve communicates with the valve sliding hole and communicates with the outer surface of the housing to communicate with the shear heating device side. One flow path and valve slide A downstream first flow path communicating with the moving hole and communicating with the outer surface of the housing and communicating with the injection device side is provided, and the downstream first flow path is provided to be inclined upward from a side surface of the communicating valve sliding hole and is provided with the same. The flow path end is made to face the cylinder taper surface of the injection device, the switching valve is configured to be slidable in a valve sliding hole of the housing, and the inclination angle of the upstream first flow path of the housing. An upstream second flow path provided at the same angle from the outer side surface of the valve body to the inner surface of the valve body, and a valve communicating with the second upstream flow path and having the same angle as the first downstream flow path of the housing; A downstream second flow path provided in an upwardly inclined shape from the main body toward the outer surface of the valve body, and the switching valve is slidably operated by a valve sliding hole in the housing. It is configured to be able to switch between the communication state and the non-communication state of the flow path. Injection molding machine equipped with a shearing heating apparatus characterized in that there.