JP2002144367A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a multi-layer molding with high productivity and monolayer molding at low cost. SOLUTION: This injection molding machine has a first injection producing part 31 and a second injection producing part 32. The first injection producing part 31 comprises a first molding device 31a for forming a cavity 11, an injection unit connecting device 10 for collecting the resin injected from a plurality of spots in a lamellar shape and forcing the collected resin into the cavity 11 and a first injection unit 13 for injecting the resin into the injection unit connecting device 10. The second injection producing part 32 comprises a second molding device 32a for forming the cavity 11 and a second injection unit 14 which is able to switch its injection direction to the directions of the molds 8 and 9 of the second molding device 32a and the injection unit connecting device 10 and selectively inject the resin into the molds 8 and 9 of the second molding device 32a and the injection unit connecting device 10 in the switched directions.

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 capable of switching between molding of a plurality of layers and molding of a single layer.

[0002]

2. Description of the Related Art Conventionally, an injection molding machine capable of producing a molded article composed of a plurality of layers of resin and color is, for example, as shown in FIG.
A mold 55 for forming a cavity 56 by mold clamping, and two injection units 52 for injecting resin into the cavity 56.
53, provided between the mold 55 and the injection units 52 and 53. The resin that is injected from the injection units 52 and 53 is collected into a skin layer and a core layer, and then guided to the mold 55. And a color molding block 54.

According to the above configuration, each injection unit 52
By injecting the resin from each of the 53, these resins are assembled in the multicolor molding block 54 to form the skin layer and the core layer, and then the cavity 56 of the mold 55 is formed.
Into a molded article having a plurality of layers. As a result, the injection operation of the two injection units 52 and 53 is performed at the same time, thereby shortening the cycle time of injection molding, thereby making it possible to manufacture a multi-layer molded product with high productivity. ing. Further, according to the above configuration, a single-layer molded product can be manufactured by injection molding using only one of the injection units 52 and 53.

[0004]

However, according to the above-mentioned conventional construction, when manufacturing a single-layer molded product, the injection units 52.5 which account for a large part of the total equipment cost.
Since one of the three needs to be stopped, there is a problem that the operation rate is low from the viewpoint of the apparatus cost. Therefore, unless a large number of molded articles having a plurality of layers are produced, the efficiency of the equipment is greatly reduced. As a result, the production cost of the molded articles rises, which makes it difficult to introduce an injection molding machine.

Accordingly, an object of the present invention is to provide an injection molding machine capable of producing a multi-layer molded product with high productivity and producing a single-layer molded product at low cost. .

[0006]

In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a first molding apparatus for forming a cavity by clamping a mold, and forming a resin injected from a plurality of locations into a layer. A first injection molding unit including an injection unit coupling device that is assembled and pressed into the cavity, and a first injection unit that injects resin into the injection unit coupling device;
A second molding device for forming a cavity by clamping the mold, and an injection direction can be changed between a direction of the second molding device and a direction of the injection unit connecting device. And a second injection molding unit including a second injection unit capable of selectively injecting resin to the injection unit connecting device.

According to the above configuration, by changing and setting the injection direction of the second injection unit to the mold direction of the second molding device, the combination of the second injection unit and the second molding device and the first With the combination of the injection unit and the first molding device, an injection molding machine having the function of two single-layer injection molding machines can be provided. On the other hand, by changing and setting the injection direction of the second injection unit to the injection unit connecting device direction of the first molding device, a combination of the second injection unit, the second molding device, and the first injection unit can be used for multiple-layer injection. An injection molding machine having a function as a molding machine can be provided. This makes it possible to switch between a single-layer molded product and a multi-layer molded product by changing the injection direction of the second injection unit, and to produce any molded product by using an injection molding machine. Since the total number of the injection units that occupy a large part of the apparatus cost is always used, it is possible to increase the operation rate from the viewpoint of the apparatus cost. As a result, the first and second
A single-layer molded product can be manufactured in parallel at the same time in the injection molding section, with high productivity.
Even when a multi-layer molded product is produced in a small amount, the equipment efficiency does not significantly decrease.

According to a second aspect of the present invention, there is provided the injection molding machine according to the first aspect, wherein at least one of the first injection molding section and the second injection molding section has an existing single-layer injection molding machine. It is characterized by being used. According to the above configuration, by using the existing single-layer injection molding machine, it is possible to further reduce the device cost and further increase the operation rate with respect to the device cost.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the injection molding machine according to the present embodiment includes a first injection generation unit 31 capable of selectively molding a multi-layer molded product and a single-layer molded product,
A second injection generating unit 32 for forming a single-layer molded product. The first injection generating unit 31 cools and solidifies the molten resin into a molded product having a predetermined shape, and discharges the molded product.
And a first injection device 31b for injecting the molten resin into the first molding device 31a. The second injection generating unit 32 cools and solidifies the resin in a molten state into a molded product having a predetermined shape, and discharges the molten resin. The first injection device 31a and the second molding device 32a are in a molten state. And a second injection device 32b capable of selectively injecting the resin.

The molding devices 31a and 31b in both the injection molding sections 31 and 32 have the mold clamping base 1.
Supporting plates 3a and 3b are provided at both ends of the mold clamping base 1, and a bar-shaped guide member 4 is horizontally provided at each corner between the supporting plates 3a and 3b. Also, a mold opening / closing cylinder 5 is provided on one support plate 3a located on the right side in the drawing.
Is provided so that the cylinder rod 5a faces the support board 3b on the other side, and a guide engagement member 6 is provided at the tip of the cylinder rod 5a. The guide member 4 described above is slidably inserted through each corner of the guide engagement member 6.
Moves along the guide member 4 to regulate the direction in which the mold opening / closing cylinder 5 advances and retreats by the cylinder rod 5a.

A movable mold 8 is provided on the guide engaging member 6 via a mold plate 7. A fixed mold 9 fixed by the support plate 3b on the other side is opposed to the movable mold 8. The movable mold 8 and the fixed mold 9 are brought into contact with the fixed mold 9 by the mold opening / closing cylinder 5 and clamped, so that the cavity 11 corresponding to the outer shape of the molded product is formed therein. Form. The two molding devices 31a and 32a configured as described above are connected to the injection devices 31b and 3 respectively.
When a molten resin is injected from 2b, the resin is cooled in the cavity 11 and solidified to form a molded product.

Further, the first molding device 31a is provided with an injection unit connecting device 10 in addition to the above configuration. The injection unit connecting device 10 is disposed between the fixed mold 9 and the support board 3b, and connects the fixed mold 9 and the support board 3b. As shown in FIG. 3, the injection unit connecting device 10 has a mold joining board 15 joined to the fixed mold 9 and a fixed board 16 fixed to the support board 3b. As shown in FIG. 2, the mold joining board 15 and the fixed board 16 are fastened via a plurality of bolts 17 so as to face each other at a predetermined interval. Then, as shown in FIG. 3, between the mold joining board 15 and the fixed board 16, the cavities 11 are gathered while gathering both resins so as to cover the periphery of the core layer resin with the skin layer resin. Is provided.

As shown in FIG. 4, the resin layer forming mechanism 18 has a male laminated member 19, a female laminated member 20, a resin introduction member 21, and a flow path opening / closing member 22. The male laminated member 19 extends through the center of the fixed platen 16, and has a distal end portion that extends from the nozzle portion 13 of the first injection unit 13.
a. Male laminated member 19
A concave curved portion 19a is formed at the tip of the nozzle portion 13a so as to come into contact with the tip of the nozzle portion 13a in a planar manner. Concave curved part 1
At the center (bottom) of 9a, one end of a skin layer flow path 19b for conducting resin from the nozzle 13a is opened. The skin layer flow path 19b is formed in the axial direction of the male-side laminated member 19, and is branched in a plurality of directions (for example, four directions) around the axial center. It is formed so as to open.

On the other side of the male side laminated member 19 in which the skin layer flow path 19b is opened at a plurality of positions, a conical inclined convex portion 19c is formed. The above-described core layer flow path 19d is provided on the inclined wall surface of the inclined convex portion 19c.
Is open. In addition, on the top of the inclined convex portion 19c,
One end of the core layer flow path 19d is opened, and after the core layer flow path 19d is formed in the axial direction of the male side laminated member 19 (inclined convex portion 19c), the mold joining machine 15 and the fixed portion are fixed. It is formed to be bent at a right angle at the center position of the board 16, to pass between the branch paths of the skin layer flow path 19 b, and to open to the side wall surface. Also, this core layer flow path 19d
A closed path 19e is communicated with the bent portion of. The closed path 19e is formed so as to open on the side wall surface in the direction opposite to the bending direction of the core layer flow path 19d.

The male laminated member 19 having the above configuration is
The female side laminated member 20 is fitted. Female laminated member 20
Is penetrated at the center of the mold joining machine 15,
One end of a collective path 20a is opened at the end of the female side laminated member 20 on the fixed mold 9 side. The collective path 20a
After being formed in the above-described inclined convex portion 19c direction, the inclined convex portion 1 is formed.
The male laminated member 19 is formed so as to be closed at the end surface while increasing the diameter so as to maintain a constant interval with respect to the inclined wall surface 9c. One end of the core layer flow path 20a and one end of the closed path 20b are opened on the side wall of the female side laminated member 20, and the other end of the core layer flow path 20a and the closed path 20b is connected to the above-mentioned end. The male layered member 19 communicates with the core layer flow path 19d and the closed path 19e.
The core layer flow path 20a, the bent core layer flow path 19d, the closed path 19e, and the closed path 20b communicate with each other in this manner, so that a straight through hole is formed in the male laminated member 19 and The female-side laminated member 20 is formed in a direction perpendicular to the mold clamping direction.

On the side wall surface on one side of the female laminated member 20, a tubular resin introduction member 21 is provided.
It is fixed so that it can communicate with. Resin introduction member 21
As shown in FIG. 3, the mold joining board 15 and the fixed board 1
It is formed so as to reach the outer peripheral portion from the center on the female laminated member 20 side between the six. At the outer end,
An adapter member 23 is provided. The adapter member 23 is brought into contact with a nozzle portion 12a of the second injection unit 12, which will be described later.

On the other hand, on the other side wall surface of the female laminated member 20, a flow path opening / closing member 22 composed of, for example, a hydraulic cylinder is provided. As shown in FIG. 4, the flow path opening / closing member 22 has a plug member 22a that can move forward and backward, and the plug member 22a is inserted into the closed passages 20b and 19e in a liquid-tight manner. The flow path opening / closing member 22 is connected to the plugging member 2.
The core layer flow path 19d is closed at the bent portion by advancing 2a, while the core layer flow path 19d is retracted by retracting the plug member 22a.
Is opened. Also, the plug member 2
The distal end of 2a has a curved surface corresponding to the bending radius of the core layer flow path 19d, and reduces the flow resistance of the resin in the bent part when the core layer flow path 19d is in the open state. It has become.

The first molding device 31a provided with the injection unit connecting device 10 configured as described above constitutes a first injection generating section 31 together with the above-described first injection device 31b. The first injection device 31b includes: an injection unit support 2;
A first injection unit 13 provided on the injection unit support 2. The first injection unit 13 is movable forward and backward such that the axis of the nozzle portion 13a is parallel to the mold clamping direction.
3a is in contact with the front surface of the injection unit connecting device 10.

On the other hand, the injection device 32b in the second injection generating section 32 includes an injection unit support 14 and a second injection unit 12 provided on the injection unit support 14. The second injection unit 12 is rotatable and movable forward and backward on the injection unit support 14.
The center of rotation of the second injection unit 12 is the distance from the center of rotation to the injection unit connecting device 10 of the first molding device 31a, and the fixed mold 9 of the second molding device 32a from the center of rotation.
It is set so that the distance to is equal. When the second injection unit 12 manufactures a single-layer molded product using the second injection device 32b, the second injection unit 12 moves forward and backward (injection direction).
Is rotated so as to be in the direction of the molds 9.8 of the second molding device 32a, while the moving direction (injection direction) is in the direction of the injection unit connecting device 10 when manufacturing a multilayer product. Is rotated as follows.

In the above configuration, the operation of the injection molding machine will be described. First, when manufacturing a single-layer molded product, the second injection unit 12 in the second injection device 32b is used.
Is rotated in the direction of the second molding device 32a,
The resin can be injected from the second injection unit 12 toward the fixed mold 9 of the second molding device 32a. Thereby, the second injection generation unit 32 and the first injection generation unit 31
Is equipped with the second injection unit 12 and the first injection unit 13 respectively, and therefore has the same function as the single-layer injection molding machine.

Next, single-layer resin is put into hoppers (not shown) of the second injection unit 12 and the first injection unit 13, respectively. Thereafter, the second injection unit 12 is moved in the direction of the second molding device 32a, the nozzle portion 12a is brought into contact with the fixed mold 9, and the first injection unit 13 is moved in the direction of the first molding device 31a. When the nozzle portion 13a is brought into contact with the injection unit connecting device 10,
Preparation for injection molding in each of the injection molding sections 32 and 31 is completed.

When the start of injection molding is instructed by pressing a molding start button (not shown) or the like, each molding device 32a, 3
In 1a, the movable mold 8 is moved in the direction of the fixed mold 9 by the mold opening / closing cylinder 5, and the movable mold 8 is pressed against the fixed mold 9 with a predetermined pressing force to perform mold clamping. When the cavity 11 is formed in the molds 8 and 9 by the mold clamping, the resin of the hopper is loaded into the injection units 13 and 12 and is injected while being melted by heating. Thereby, in the second molding device 32a, the resin in the molten state is directly pressed into the cavity 11. On the other hand, in the first molding device 31a, the resin in a molten state is press-fitted into the cavity 11 via the skin layer flow path 19b of the injection unit connecting device 10. Then, the resin is cooled and solidified in each cavity 11, formed into a single-layer molded product by the injection molding sections 31 and 32, and then taken out by opening the mold.

On the other hand, when manufacturing a molded article having a plurality of layers, the second injection unit 12 is rotated in the direction of the first molding device 31a, and the forward / backward movement direction of this unit 12 is set in the direction of the injection unit connecting device 10. By being done,
The injection unit 12 is set in a state where the resin can be injected into the first molding device 31a. As a result, the first injection generation unit 31 makes the first injection unit 13 and the second injection unit 1
2 so that a plurality of layers (2
Layer) has the same function as an injection molding machine.

Next, a resin for a skin layer (hereinafter, referred to as a skin layer resin) and a resin for a core layer (hereinafter, referred to as a core layer resin) are provided in hoppers (not shown) of the first injection unit 13 and the second injection unit 12. Are respectively input. Then, as shown in FIG.
The preparation of the injection molding is completed when the twelve nozzle portions 13a and 12a abut on the male side laminated member 19 and the adapter member 23, respectively.

Thereafter, when the start of injection molding is instructed by pressing a molding start button or the like (not shown), the movable mold 8 is moved by the mold opening / closing cylinder 5 in the first injection generating section 31, as shown in FIG. Is moved in the direction of the fixed mold 9, and the movable mold 8 is pressed against the fixed mold 9 with a predetermined pressing force and clamped. When the cavities 11 are formed in the dies 8 and 9 by the mold clamping, the skin layer resin is loaded into the first injection unit 13 and is injected prior to the core layer resin while being melted by heating.

As shown in FIG. 4, the above-mentioned skin layer resin is supplied to the injection unit connecting device 10 through the nozzle portion 13a.
Flows into the skin-layer flow path 19b of the male-side laminated member 19 at, and advances while being branched in a plurality of directions in the skin-layer flow path 19b. Then, as the skin layer resin further advances in the skin layer flow path 19b, it flows out into the gap between the inclined protruding portion 19c of the male side laminated member 19 and the core layer flow path 20a of the female side laminated member 20, and is inclined. It flows in the direction of the fixed mold 9 while completely covering the inclined wall surface of the projection 19c.

On the other hand, when a predetermined waiting time elapses after the resin of the skin layer is discharged, the plug member 22a of the flow path opening / closing member 22 is retracted, and the flow path 19d for the core layer is moved.
Is opened. Then, as shown in FIG.
The core layer resin is loaded into the injection unit 12, and the core layer resin melted by heating is injected at a pressure lower than the injection pressure of the skin layer resin. As shown in FIG. 4, the core layer resin is applied to the female side laminated member 20 via a resin introduction member 21.
And core layer passages 20a and 19d of the male laminated member 19
After the traveling direction is bent by the plugging member 22a, it flows out from the tip of the inclined convex portion 19c. At this time, the skin layer resin discharged earlier gathers at the tip of the inclined convex portion 19c along the inclined wall surface of the inclined convex portion 19c. Therefore, the core layer resin that has flowed out from the tip of the inclined convex portion 19c passes through the core layer flow path 20a together with the skin layer resin while being completely covered with the skin layer resin, and the cavity 11 of the fixed mold 9 is formed. Press-fit.

After that, a predetermined amount of the skin layer resin and the core layer resin are press-fitted, and when one injection molding is completed, the plugging member 22a of the channel opening / closing member 22 is advanced, so that the core layer channel is opened. 19d is closed and put on standby. Then, the skin layer resin and the core layer resin are cooled and solidified in the cavity 11 to form a molded product having a plurality of layers.

As described above, the injection molding machine according to the present embodiment collects the resin injected from a plurality of locations into the first molding apparatus 31a that forms the cavity 11 by clamping the dies 8, 9. Unit 10 for press-fitting the injection unit into the cavity 11, a first injection generator 31 having a first injection unit 13 for injecting resin into the injection unit connection device 10, and clamping the molds 8.9. A second molding device 32a for forming the cavity 11, a direction of the molds 8 and 9 of the second molding device 32a and the injection unit connecting device 10
The injection direction can be changed in the direction shown in FIG.
And a second injection generation unit 32 including a second injection unit 12 capable of selectively injecting resin.

According to the above configuration, the second injection unit 1
By changing and setting the injection direction of the first injection unit 1 to the directions of the dies 8 and 9 of the second molding device 32a, the first injection unit 1
3 and the first molding device 31a, and the combination of the second injection unit 12 and the second molding device 32a
An injection molding machine having a function as a single-layer injection molding machine can be provided. On the other hand, by changing and setting the injection direction of the second injection unit 12 toward the injection unit connecting device 10 of the first molding device 31a, the first injection unit 13, the first molding device 31a, and the second injection unit 12 are connected. In combination, an injection molding machine having a function as a multi-layer injection molding machine can be obtained.

Therefore, it is possible to switch between a single-layer molded product and a multi-layer molded product by changing the injection direction of the second injection unit 12 and to manufacture any molded product. Since the total number of the injection units 12 and 13 occupying a large part of the equipment cost of the injection molding machine is always used, it is possible to increase the operating rate from the viewpoint of the equipment cost. As a result, in the first and second injection molding sections 31 and 32, a single-layer molded article can be simultaneously manufactured in parallel and mass-produced, and a multi-layer molded article can be produced in small quantities. Also, the equipment efficiency is not significantly reduced.

In the present embodiment, the second injection unit 12 is rotatable with respect to the injection unit support 14; however, the present invention is not limited to this. As shown in FIG. The second injection unit 12 may be rotated by rotating the unit support 14. In this case, the forward / backward moving mechanism and the rotating mechanism can be provided on the upper side and the lower side of the second injection unit 12, respectively, so that each mechanism can be simplified.

In the present embodiment, the injection direction is changed by the rotation of the second injection unit 12 so that the injection to the second molding device 32a and the first molding via the injection unit connecting device 10 are performed. The switching between the injection to the device 31a and the injection to the device 31a is enabled, but the invention is not limited to this. That is, as shown in FIG. 6, for example, the injection unit support base 14 is movably provided by the rail 41, and the second injection generation unit 32 and the first injection generation unit 31 are arranged in parallel along the rail 41, By changing the injection direction by moving back and forth on the top 41, it is possible to switch between injection to the second molding device 32a and injection to the first molding device 31a via the injection unit connecting device 10. good. In this case, by extending the rail 41 or combining the linear or curved rail 41, it becomes possible to arrange a large number of injection molded parts 31 and 32 so as to be communicable via the rail 41, The degree of freedom of the layout of the injection molding machine can be increased.

Further, in the present embodiment, the injection molding machine is configured with the first injection generating section 31 and the second injection generating section 32 as one set, but the present invention is not limited to this. The first injection generation unit 31 and the second injection generation unit 32 may be provided in an arbitrary number according to the production mode. Further, the first injection generation unit 31 and the second injection generation unit 3
An existing single-layer injection molding machine may be used for at least one of the two. In this case, by using the existing single-layer injection molding machine, the apparatus cost can be reduced by reducing the apparatus cost. Operating rate can be further increased.

[0035]

According to the first aspect of the present invention, there is provided a first molding apparatus for forming a cavity by clamping a mold, and an injection unit connecting apparatus for collecting resin injected from a plurality of locations into a layer and press-fitting the resin into the cavity. A first injection molding unit having a first injection unit for injecting a resin into the injection unit connecting device, a second molding device for forming a cavity by clamping a mold, and a metal mold for the second molding device. A second injection unit which is capable of changing an injection direction between a mold direction and the injection unit connecting device direction, and which is capable of selectively injecting a resin to the mold and the injection unit connecting device of the second molding device; And a second injection-molded part provided with

According to the above configuration, it is possible to switch between a single-layer molded product and a multilayer molded product by changing the injection direction of the second injection unit, and to manufacture any molded product. Even in this case, since the total number of injection units, which occupy a large part of the equipment cost of the injection molding machine, is always used, it is possible to increase the operation rate from the viewpoint of the equipment cost. As a result, in the first and second injection molding sections, a single-layer molded product can be produced in parallel at the same time to produce with high productivity, and a multi-layer molded product can be produced in a small amount. However, there is an effect that the equipment efficiency is not significantly reduced.

According to a second aspect of the present invention, there is provided the injection molding machine according to the first aspect, wherein at least one of the first injection molding section and the second injection molding section includes an existing single-layer injection molding machine. This is the configuration used. According to the above configuration, by using the existing single-layer injection molding machine, there is an effect that the operation rate can be further increased by reducing the apparatus cost.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an injection molding machine.

FIG. 2 is a plan view of the injection unit connecting device.

FIG. 3 is a cross-sectional view of the injection unit connecting device taken along line AA in FIG. 2;

FIG. 4 is an enlarged sectional view showing a main part of the injection unit connecting device.

FIG. 5 is a schematic configuration diagram of an injection molding machine.

FIG. 6 is a schematic configuration diagram of an injection molding machine.

FIG. 7 is a schematic configuration diagram of a conventional multiple injection molding machine.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mold clamping base 2 injection unit mounting table 4 guide member 5 mold opening / closing cylinder 6 guide engagement member 7 mold plate 8 moving mold 9 fixed mold 10 injection unit coupling device 11 cavity section 12 first injection unit 13 second injection Unit 31 First injection molding unit 31a First molding device 31b First injection device 32 Second injection molding unit 32a Second molding device 32b Second injection device

Claims (2)

[Claims] 1. A first molding apparatus for forming a cavity by clamping a mold, an injection unit connecting apparatus for collecting resin injected from a plurality of locations into a layer and press-fitting the resin into the cavity, and an injection unit connecting apparatus. The first to inject resin into
A first injection molding unit having an injection unit, a second molding device for forming a cavity by clamping a mold, and an injection direction in a mold direction of the second molding device and in the direction of the injection unit connecting device. And a second injection unit having a second injection unit which is made changeable and which is capable of selectively injecting a resin to the mold and the injection unit connecting device of the second molding device. Injection molding machine. 2. The injection molding machine according to claim 1, wherein at least one of the first injection molding section and the second injection molding section uses an existing single-layer injection molding machine. .