JP3290902B2 - Multi-layer injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a multiple of several layers injection molding machine that enables pressed each resin from a plurality of injection units with respect to the cavity of the mold.

[0002]

2. Description of the Related Art Generally, when manufacturing a molded article composed of a plurality of layers of resin or color, an injection molding machine is employed which presses and molds the resin of each layer into a mold in order. In order to shorten the molding time and improve the productivity, a multi-layer injection molding machine capable of pressing all the resin layers into a mold in one operation has been developed and adopted.

As shown in FIG. 5, a conventional multi-layer injection molding machine has a heating cylinder 51 capable of increasing the internal temperature to a predetermined temperature or higher.
(E.g., two) injection units 5 each having an extrusion screw 52 rotatably provided in a heating cylinder 51.
3 and 53 are arranged in parallel for each layer of resin, and these injection units 53 and 53 are joined by a nozzle member 54 to be integrated. When the injection molding is performed, after the tip of the nozzle member 54 is brought into contact with the sprue hole of the mold 55, the resin from each of the injection units 53 is gathered at the nozzle member 54 and discharged from the tip. By doing so, the resin of each layer is pressed into the mold 55 at the same time.

[0004]

However, as in the above-described conventional case, in a configuration in which all the injection units 53 are joined to the nozzle member 54 to be integrated, the injection unit 5
Since it is a dedicated machine for molded articles having the number of layers corresponding to the number of units of 3.53, it is necessary to introduce and install a plurality of injection molding machines for each molded article of each number of layers.
Therefore, for example, even if a single-layer injection molding machine is introduced,
When a two-layer molded product is required, it is necessary to introduce a new two-layer injection molding machine in addition to this injection molding machine, so that existing equipment such as an injection molding machine and a transport device can be effectively used. There is a problem that it cannot be used. In particular,
In a factory where there is not enough installation area, it is necessary to take measures such as changing the equipment layout of each equipment and disposing of the less frequently used existing injection molding machine to secure the installation space. It has become extremely difficult to introduce.

Accordingly, the present invention is one in which existing equipment together with a readily available, and to provide a multi several layers injection molding machine that enables the manufacture of any number of layers of the molded article .

[0006]

Means for Solving the Problems In order to solve the above problems, the invention according to claim 1 is provided in a direction in which a mold is closed.
Injection unit and a direction perpendicular to the mold clamping direction
Injection unit so that it has
A multi-layer injection molding machine incorporating a connecting device,
The injection unit connecting device, the skin layer resin and the core layer resin from a plurality of injection units to a cavity formed by pressing the movable mold against a fixed mold fixed to the support member and clamping the mold. Monodea to allow press
To fix the fixed mold to the support member,
A connection device main body interposed between the fixed mold and the support member; and a plurality of resin flow paths provided in the connection device main body and communicating the cavity and the injection units. A resin flow path unit in which the resin flow paths are gathered on the cavity side so that the skin layer resin and the core layer resin flowing through the resin simultaneously press-fit into the cavity section; and a resin flow path through which at least the core layer resin flows. A flow path opening / closing means capable of closing a road at an arbitrary timing is provided.

Thus, the number of injection units can be arbitrarily changed by changing the number of resin flow paths of the injection unit connecting device, so that a plurality of molded articles having an arbitrary number of layers can be formed. A layer injection molding machine can be obtained.
Also, by matching the design specifications of the connecting device main body and the resin flow path means to the existing molds and injection molding machines, these existing molds and injection molding machines can be used as they are, and the multi-layer injection molding machine can be used. It can be. Therefore, it is possible to obtain a multi-layer injection molding machine for an arbitrary number of layers while effectively utilizing existing equipment. Further, since the opening / closing timing of the resin flow path can be arbitrarily set by the flow path opening / closing means, the timing of the start of press-fitting and the end of press-fitting of each resin into the cavity can be arbitrarily set, and the resin leakage can be reliably prevented. Can be prevented. In addition, each injection unit is
Multi-layer injection molding machine with knit arrangement
it can.

According to a second aspect of the present invention, a plurality of layers are provided.
In the injection molding machine , the resin flow path means supplies the cavity layer portion while gathering both resins so as to cover the periphery of the core layer resin with the skin layer resin.

[0009]

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 multilayer injection molding machine according to the present embodiment has a mold clamping base 1 and an injection unit mounting table 2. Support members 3a and 3b are provided vertically at both ends of the mold clamping base 1, and between the support members 3a and 3b, bar-shaped guide members 4 are provided horizontally at each corner. A mold opening / closing cylinder 5 is provided on one of the support members 3a located on the left side in the figure so that the cylinder rod 5a faces the support member 3b on the other side. , A guide engaging member 6 is provided. The guide members 4 described above are slidably inserted through the corners of the guide engagement members 6. The guide engagement members 6 move along the guide members 4. The direction of movement of the mold opening / closing cylinder 5 by the cylinder rod 5a is regulated.

A movable mold 8 is provided on the guide engaging member 6 via a mold plate 7. The movable mold 8 includes a fixed mold 9 joined to the back of the injection unit connecting device 10.
In the injection unit connecting device 10, the outer peripheral portion on the front surface is fixed to the support member 3b on the other side. As a result, the fixed mold 9 is fixed to the support member 3b on the other side via the injection unit connecting device 10, and the movable mold 8 and the fixed mold 9 are separated from each other by the movable mold 8 Is brought into contact with the fixed mold 9 by the mold opening / closing cylinder 5 to clamp the mold, thereby forming the cavity portion 11 therein.

Into the cavity 11, two kinds of resins, which are composed of a core layer constituting the inside of the molded product and a skin layer covering the core layer, are simultaneously press-fitted through the injection unit connecting device 10. It has become. In addition, these resins may be different in color and function,
The resin obtained by collecting and regenerating the molded product may be used for the core layer. The resin of the core layer (core layer resin) and the resin of the skin layer (skin layer resin) are supplied from the first injection unit 12 and the second injection unit 13, respectively. First injection unit 12
Is a slide mechanism 14 fixed on the upper surface of the support member 3b.
It is provided in. The slide mechanism 14 supports the first injection unit 12 so that the axis of the nozzle portion 12a of the first injection unit 12 is perpendicular to the mold clamping direction so as to be able to move up and down. Sometimes, the nozzle portion 12a of the first injection unit 12 is brought into contact with the side surface of the injection unit connecting device 10. On the other hand, the second injection unit 13 is provided on the injection unit mounting table 2 so as to be able to advance and retreat so that the axis of the nozzle portion 13a is parallel to the mold clamping direction. At the time of supply, the nozzle portion 13a comes into contact with the front surface of the injection unit connecting device 10.

As shown in FIG. 3, the injection unit connecting device 10 to which the above-mentioned nozzle portions 12a and 13a come into contact includes a mold joining board 15 joined to the fixed mold 9 and a support member 3b.
And a fixed platen 16 fixed to the base plate. Mold joining machine 1
As shown in FIG. 2, the fixed plate 5 and the fixed plate 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 two resins are supplied to the cavity portion 11 while gathering the two so as to cover the periphery of the core layer resin with the skin layer resin. A resin layer forming mechanism 18 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-side laminated member 19 extends through the center of the fixed platen 16, and has a tip portion at the nozzle portion 13 of the second injection unit 13.
a. Male laminated member 19
A concave curved portion 19a is formed at the distal end of the concave curved portion 19a so as to contact the distal end of the nozzle portion 13a in a planar manner.
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. And
The above-described core layer flow path 19d is opened on the inclined wall surface of the inclined convex portion 19c. In addition, one end of the core layer flow path 19d is opened at the top of the inclined protrusion 19c,
The core layer flow path 19d is connected to the male side laminated member 19 (inclined convex portion 1).
After being formed in the axial direction of 9c), it is bent in a right angle direction at the center position of the mold joining board 15 and the fixed board 16,
It is formed so as to pass between the branch paths of the skin layer flow path 19b and open to the side wall surface. A closed path 19e is communicated with the bent portion of the core layer flow path 19d, and the closed path 19e is opened on a side wall surface in a direction opposite to the bending direction of the core layer flow path 19d. Is formed.

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 20c and the closed path 20b is opened on the side wall of the female side laminated member 20, and the other end of the core layer flow path 20c 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.
In this way, the core layer flow path 20c, the bent core layer flow path 19d, the closed path 19e, and the closed path 20b are communicated with each other, 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 one side wall surface of the female laminated member 20, a tubular resin introducing 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
6 and is formed so as to reach the outer peripheral portion from the central portion on the female side laminated member 20 side,
An adapter member 23 is provided. The nozzle member 12a of the first injection unit 12 is brought into contact with the adapter member 23.

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 operation of the multi-layer injection molding machine having the above configuration will be described. First, as shown in FIG. 1, a mold opening / closing cylinder 5 and molds 8 and 9 provided on a mold clamping base 1 via support members 3 a and 3 b, and a second mold set on the injection unit mounting table 2. In the case where a single-layer injection molding machine having the two-injection unit 13 already exists and this injection molding machine is used as a two-layer multi-layer injection molding machine, the injection unit connecting device 10 and the slide are used. The mechanism 14 and the first injection unit 12 are assembled.

That is, as shown in FIG. 3, the injection unit connecting device 10 is fixed to the support member 3b by attaching the fixing plate 16 to the support member 3b. Then, by attaching the fixed mold 9 to the mold joining board 15, the fixed mold 9 is connected to the support member 3 via the injection unit connecting device 10.
b. Thereafter, as shown in FIG. 1, the slide mechanism 14 is attached to the upper end of the support member 3b, and the first injection unit 12 is attached to the slide mechanism 14.
Is attached to form a multi-layer injection molding machine for two layers.

Next, the core layer resin and the skin layer resin are put into hoppers (not shown) of the first injection unit 12 and the second injection unit 13, respectively. Then, as shown in FIG. 3, the nozzle portions 12a and 13a of the first injection unit 12 and the second injection unit 13 are brought into contact with the adapter member 23 and the male side laminated member 19, respectively, thereby completing the preparation for injection molding. I do.

Thereafter, when the start of injection molding is instructed by pressing a molding start button or the like (not shown), the multi-layer injection molding machine causes the movable mold 8 to be moved by the mold opening / closing cylinder 5 as shown in FIG. The movable mold 8 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 to perform mold clamping. When the cavity portions 11 are formed in the molds 8 and 9 by the mold clamping, the skin layer resin is loaded into the second injection unit 13 and heated, and the melted skin layer resin is converted into the core layer resin. Discharge beforehand.

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, the inclined convex portion 19c of the male side laminated member 19 and the collecting path 2 of the female side laminated member 20 are formed.
It flows out into the gap with the fixed mold 9a and flows in the direction of the fixed mold 9 while completely covering the inclined wall surface of the inclined convex portion 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 channel opening / closing member 22 is retracted so that the core layer flow channel 19d is formed.
Is opened. Then, the core layer resin is loaded into the first injection unit 12 and heated, and the molten core layer resin is discharged at a pressure lower than the discharge pressure of the skin layer resin. The core layer resin is supplied to the core layer flow path 20 c of the female side laminated member 20 and the male side laminated member 19 via the resin introduction member 21.
-After flowing into 19d, the traveling direction is bent by the stopper member 22a, and then 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. Accordingly, the core layer resin flowing out from the tip of the inclined convex portion 19c passes through the collecting path 20a together with the skin layer resin and is pressed into the cavity 11 of the fixed mold 9 while being completely covered with the skin layer resin. Will be done.

Thereafter, the skin layer resin and the core layer resin are press-fitted in a predetermined amount unit, and when one injection molding is completed,
By advancing the plugging member 22a of the flow path opening / closing member 22, the core layer flow path 19d is closed and enters a standby state. Then, when the start of the next injection molding is instructed, the above-described series of operations is repeated again.

As described above, the injection unit connecting apparatus 10 of the present embodiment presses the movable mold 8 against the fixed mold 9 fixed to the support member 3b to clamp the mold as shown in FIG. The first injection unit 12 and the second injection unit 13 allow the resin to be press-fitted into the cavity 11 formed by the above-described method, and are fixed so that the fixed mold 9 is fixed to the support member 3b. A coupling device main body (die joining plate 15, fixed plate 16) interposed between the mold 9 and the support member 3b is provided in the coupling device main body, and allows the cavity 11 to communicate with the injection units 12 and 13. Resin flow path means (male side laminated member 1) having a plurality of resin flow paths (skin layer flow path 19b, core layer flow path 19d, etc.)
9, a female side laminated member 20, and a resin introduction member 21).

Although the present embodiment has been described using a multi-layer injection molding machine having two injection units including a first injection unit 12 and a second injection unit 13, the present invention is not limited to this configuration. However, if the number of channels in the male laminated member 19 and the female laminated member 20 is increased, a multi-layer injection molding machine having three or more injection units can be obtained.

Thus, the fixed mold 9 and the support member 3
By interposing the connecting device main body between the injection unit connecting device 1 and the injection unit connecting device 10, the fixing of the fixed mold 9 to the support member 3 b is completed simultaneously with the mounting of the injection unit connecting device 10.
Since the number of injection units 12 and 13 can be arbitrarily changed by changing the number of flow paths such as the core layer flow path 19d of 0, a multi-layer injection capable of molding a molded article of an arbitrary number of layers. A molding machine can be easily obtained. Further, by matching the design specifications of the mold joining machine 15 and the male side laminated member 19 with the existing fixed mold 9 and injection molding machine, these existing fixed mold 9 and injection molding machine can be used as they are. A multi-layer injection molding machine can be used. Therefore, it is possible to obtain a multi-layer injection molding machine while effectively utilizing existing equipment.

As shown in FIG. 4, the resin flow passage means (male-side laminated member 19, female-side laminated member 20, resin-introducing member 21) of the injection unit connecting device 10 in this embodiment is a mold 8 9, the skin layer flow path 19b (first resin flow path) formed in the mold clamping direction, and the core layer flow paths 19d and 20c formed in a direction perpendicular to the mold clamping direction.
(Second resin flow path). still,
The forming direction of the second resin flow path such as the core layer flow path 20c is as follows.
The direction does not need to be orthogonal to the mold clamping direction, but may be any direction that intersects at an arbitrary angle in the height direction or the horizontal direction, for example.

As a result, the skin layer flow path 19b (first
According to the equipment layout centered on the second injection unit 13 connected to the second injection unit 13, for example, the core layer flow path 2 is moved toward a marginal installation space in the height direction or the horizontal direction.
0c or the like (second resin flow path) can be determined. Therefore, the existing injection molding machine can be changed to a multi-layer injection molding machine for an arbitrary number of layers without moving existing equipment.

Further, the injection unit connecting device 10 of the present embodiment is configured to have a flow path opening / closing member 22 (flow path opening / closing means) capable of opening / closing the core layer flow path 20c. still,
The channel opening / closing means, in addition to opening / closing the core layer channel 20c,
If necessary, the skin layer flow path 19b may be opened and closed. Further, in the present embodiment, the flow path opening / closing member 22 is configured by a hydraulic cylinder,
Closure member 2 for air cylinder, screw drive, link mechanism, etc.
Any configuration may be used as long as it moves 2a forward and backward. This allows
Since the opening / closing timing of the core layer flow path 20c can be arbitrarily set by the flow path opening / closing member 22, the timing of starting and ending the press-fitting of each resin into the cavity can be arbitrarily set, and the resin leakage can be prevented. Can be reliably prevented.

The multi-layer injection molding machine of the present embodiment
As shown in FIG. 1, the injection unit coupling device includes a second injection unit 13 arranged in the mold clamping direction and a first injection unit 12 arranged in a direction orthogonal to the mold clamping direction. 10 is incorporated.
In the present embodiment, the first injection unit 12 has been described as having a vertically arranged configuration in which the first injection unit 12 is disposed above the injection unit connecting device 10. It may be configured so as to be placed horizontally on the side. Further, in the present embodiment, the mold clamping portion (mold clamping direction) is a horizontal type (horizontal direction), but may be a vertical type (vertical direction). This allows
Each injection unit 12.1 in the orthogonal direction which is the least obstructive
3 is a multi-layer injection molding machine.

The multi-layer injection molding machine of the present embodiment
In a single-layer injection molding machine having the second injection unit 13,
Since the first injection unit 12 is provided by incorporating the injection unit connecting device 10, the introduction cost is reduced.

[0033]

According to the first aspect of the present invention, in the mold clamping direction,
Injection unit and orthogonal to the mold clamping direction
And an injection unit arranged in the direction of
Multi-layer injection molding machine with integrated injection unit
A is, the injection unit concatenation unit, the skin layer resin from a plurality of injection units with respect to a cavity part formed by clamping by pressing the movable die to the stationary fixed die to a support member and it is the core layer resin which allow press fitting, the stationary die so as to fix to the support member, a connecting device main body interposed between the fixed die and the support member, to the connecting device main body A plurality of resin passages provided for communicating the cavity portion with the respective injection units, such that the skin layer resin and the core layer resin flowing through the resin passages are simultaneously pressed into the cavity portion. A resin flow path means in which flow paths are gathered on the cavity portion side, and a flow path opening / closing means capable of closing at least a resin flow path through which the core layer resin flows at an arbitrary timing It is configured to have.

Since the number of injection units can be arbitrarily changed by changing the number of resin flow paths of the injection unit connecting device, a plurality of molded articles having an arbitrary number of layers can be formed. A layer injection molding machine can be obtained.
Also, by matching the design specifications of the connecting device main body and the resin flow path means to the existing molds and injection molding machines, these existing molds and injection molding machines can be used as they are, and the multi-layer injection molding machine can be used. It can be. Therefore, there is an effect that it is possible to obtain a multi-layer injection molding machine for an arbitrary number of layers while effectively utilizing existing equipment. Further, since the opening / closing timing of the resin flow path can be arbitrarily set by the flow path opening / closing means, the timing of the start of press-fitting and the end of press-fitting of each resin into the cavity can be arbitrarily set, and the resin leakage can be reliably prevented The effect that it can prevent is exhibited. In addition, most obstacles
Configuration in which each injection unit is arranged in the orthogonal direction that is hardly harmful
Of a multi-layer injection molding machine.
I do.

According to a second aspect of the present invention, there is provided a multi-layer structure according to the first aspect.
In the injection molding machine , the resin flow path unit supplies the resin to the cavity while gathering both resins so as to cover the periphery of the core layer resin with the skin layer resin.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a multi-layer 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 sectional view of a main part of a conventional multi-layer injection molding machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold clamping base 2 Injection unit mounting table 3a, 3b Support member 4 Guide member 5 Mold opening / closing cylinder 6 Guide engagement member 7 Mold plate 8 Moving mold 9 Fixed mold 10 Injection unit connecting device 11 Cavity part 12 First injection Unit 13 Second injection unit 14 Slide mechanism 15 Mold joining machine 16 Fixing machine 17 Bolt 18 Resin layer forming mechanism 19 Male side laminated member 20 Female side laminated member 21 Resin introduction member 22 Channel opening / closing member 23 Adapter member

Continuation of front page (56) References JP-A-61-268421 (JP, A) JP-A-56-69137 (JP, A) JP-A-63-139718 (JP, A) JP-A-2-25314 (JP) JP-A-6-87138 (JP, A) JP-A-51-24662 (JP, A) JP-A-7-9488 (JP, A) JP-A-53-134062 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) B29C 45/16 B29C 45/26

Claims (2)

(57) [Claims] 1. An injection unit disposed in a mold clamping direction of a mold.
And a direction perpendicular to the mold clamping direction.
Injection unit connection equipment
A multi-layer injection molding machine in which the movable unit is pressed against a fixed mold fixed to a support member and clamped against a cavity formed by clamping. Te allowing press-fitting the skin layer resin and the core layer resin from a plurality of injection units Monodea
Ri, the fixed mold so as to fix to the support member, a connecting device main body interposed between the fixed die and the support member, provided in the connecting device main body, and the cavity portion each injection unit And a plurality of resin flow paths that communicate with
A resin flow path unit in which the resin flow paths are assembled on the cavity side such that the skin layer resin and the core layer resin flowing through the resin flow paths simultaneously press-fit into the cavity section, and at least the core layer resin is A multi-layer injection molding machine comprising: a channel opening / closing means capable of closing a flowing resin channel at an arbitrary timing. 2. The resin flow path unit according to claim 1, wherein the resin flow path unit supplies the resin to the cavity while gathering both resins so as to cover the periphery of the core layer resin with the skin layer resin.
Multi-layer injection molding machine .