JPH05220778A - Injection molding apparatus for perforated plate member - Google Patents

Abstract

PURPOSE:To simultaneously mold a plurality of perforated plate members and to reduce an inferior product by simultaneously supplying a molten resin into a plurality of cavities under pressure from one molten resin heating pressure feed device through a plurality of injection nozzles. CONSTITUTION:An introducing passage unit 37, a branch passage unit 33 and respective injection nozzle units 27a, 27b are assembled within a fixed plate 7 to constitute the hot runners up to respective cavities 11a, 11b. The respective units 37, 33, 27a, 27b are independently controlled in temp. by electric heating members 43, 45, 47a, 47b. The completion period of the injection of a resin is adjusted by driving punches 107a, 107b having a special tip shape independently provided to the cavities 11a, 11b under individual conditions. By this constitution, the generation of shape inferiority due to the deficiency of a resin or the generation of resudual strain due to the excessive resin can be certainly prevented even with respect to both cavities 11a, 11b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perforated plate-shaped injection molding apparatus for molding a perforated plate-like body such as a video disc or a compact disc, and more particularly to a plurality of injection molding devices by one injection molding device. The present invention relates to a device capable of simultaneously molding the plate-shaped body with holes.

[0002]

2. Description of the Related Art Conventionally, various injection molding apparatuses for plate members with holes for molding video discs, compact discs, etc. have been known. For example, the device described in Japanese Patent Publication No. 62-45809 and Japanese Patent Laid-Open No. 3-90325. There is a device described in the publication.

[0003]

However, since these conventional apparatuses can mold only one disk at a time, a plurality of injection molding apparatuses are required to improve the production efficiency. In this case, as many molten resin heating and pressure-feeding devices as the number of injection molding devices are needed, and the production system as a whole has a lot of duplication and becomes complicated.

Therefore, a cavity surface for forming a plurality of cavities is provided on the joint surface when the mold is closed, and the molten resin is simultaneously supplied to each cavity from one molten resin pressure feeding device.
When an attempt was made to provide an injection molding apparatus capable of simultaneously molding a plurality of plate-shaped members with holes, there were the following problems, and their provision was not easy.

It is necessary to individually provide injection nozzles for the plurality of cavities, but the dimensions and the like are slightly different from each other due to manufacturing tolerances and the like. Therefore, at the same temperature
Even if the molten resin is supplied under the pressure condition, the flow and the injection amount of the molten resin in each injection nozzle are different. Here, the injection of the molten resin should be completed when the amount of the molten resin that is equal to the volume of each cavity is injected. When the amount of the resin is insufficient, the shape becomes defective, while when the amount is too large, a defect such as residual strain occurs due to an increase in molding pressure occurs. However, according to the conventional technique, the completion of the injection of the molten resin is due to the stop of the molten resin pumping,
It cannot be controlled for each cavity. For this reason,
In the injection molding apparatus in which a plurality of cavities are simply formed, there is a problem that many defective products are generated.

Therefore, it is possible to simultaneously form a plurality of plate-shaped members with holes by simultaneously sending a molten resin from a single molten resin pressure feeding device to a plurality of cavities through a plurality of injection nozzles, and The present invention has been completed with the first object of providing an injection molding apparatus for a plate-shaped body with holes in which the generation of non-defective products is small.

Further, due to a slight difference in the shape of each injection nozzle, a distance from the molten resin heating and pressure feeding device, and the like, there is a slight difference in the injection start timing of the molten resin. Therefore, it may be necessary to set complicated control conditions for controlling the injection completion timing.

Therefore, it is a second object of the present invention to provide an injection molding apparatus for a plate-shaped body with holes, which can achieve the first object with a simple control by independently controlling the starting condition of the injection. And Furthermore, if a configuration is adopted in which the molten resin is pressure-fed from one molten resin pressure-feeding device to a plurality of injection nozzles, the pressure-feeding path becomes long and the resin is cooled midway, so the resin may not flow well. is there.

Therefore, it is a third object of the present invention to provide an injection molding device for a plate-shaped body with a hole, which can surely achieve the first and second objects by independently controlling the pressure-feeding conditions on the way. To aim.

[0010]

In order to achieve the first object, the injection molding device for a plate-shaped body with holes according to the present invention has the following features. A fixed mold and a movable mold having a cavity surface for forming a cavity for plate-shaped body molding, an injection nozzle for injecting a molten resin into the cavity, and a perforating member protruding into the cavity, For a plate-shaped body with a hole, in which a molten resin is injected from the injection nozzle to form a plate-shaped body, and the plate-shaped body with a hole is formed by projecting the perforating member to open a hole in the plate-shaped body. In the injection molding apparatus, the fixed mold and the movable mold have a cavity surface shape that forms a plurality of independent cavities for plate-shaped body molding between the joint surfaces when the mold is closed, and the injection nozzle is Ejection port at the center of the planned hole for each of the multiple cavities At least two or more of the cavities are arranged so as to be opened and are connected to a resin introduction path from the same molten resin supply source through a branch path, and the piercing member faces each of the injection nozzles to form a cavity. It is arranged so as to be able to project inward, and at the time of projecting, it has a tip shape that opens a hole at the expected hole opening position and closes the injection port from the injection nozzle to the cavity. It is characterized by comprising an independent drive control means for controlling the drive.

According to this injection molding device for plate-shaped members with holes,
When the molten resin is supplied from the same molten resin supply source, the molten resin is simultaneously injected into the plurality of cavities. on the other hand,
The injection port can be closed independently in each cavity by the independent drive control means. Therefore, even if one molten resin supply source is shared, the injection completion timing of each cavity can be controlled without specially operating the molten resin supply source side.

Further, in order to achieve the second object, in the present invention, in the injection molding device for a plate with a hole according to claim 1, a branch passage is provided to the resin introduction passage from the same molten resin supply source. A heating member is provided in each of the injection nozzles connected through the injection nozzles, and the temperature of each heating member is controlled independently for each injection nozzle. The molding equipment has also been completed.

According to the apparatus of the second aspect, the temperature can be controlled for each of the injection nozzles, so that the distance from the molten resin supply source can be obtained irrespective of the delicate difference in shape between the injection nozzles. In spite of the above, the injection start timing to each cavity can be adjusted arbitrarily. Therefore, even when controlling the injection completion time, the injection start time, which is the basis for the control, can be accurately suppressed, and the control condition becomes simple.

Further, in order to achieve the third object, in the present invention, in the injection molding device for a plate-shaped body with holes according to claim 2, a resin supply passage from the branch passage to each injection nozzle tip is provided. It is configured by assembling the branch path unit and each injection nozzle unit in a fixed mold,
Each heating member is provided for each injection nozzle unit, and an independent heating member is also provided for the branch passage unit, and a branch passage temperature control means for controlling the temperature separately from each injection nozzle unit is also provided. We also completed the injection molding machine for plate-like bodies with holes.

According to the apparatus of the third aspect, the branch passage and the injection nozzle are separately assembled as a unit to form the whole assembly, and the temperature of the branch passage unit itself can be controlled independently. Since it is possible, the influence of cooling on the way can be removed. Further, in the branch path unit, the resin is always kept in a molten state so that the injection can be started at any time, and the injection start timing can be adjusted in the injection nozzle unit. By adjusting in this way,
It is also possible to start the resin injection at any time without delay.

[0016]

EXAMPLES Next, preferred examples will be described in order to further clarify the present invention. The embodiment is an injection molding apparatus for molding a disc-shaped disc having a hole at the center.
As shown in FIG. 1, the injection molding apparatus 1 of the embodiment includes a fixed plate 7 fastened and fixed to a plurality of stays 3 by nuts 5, and a movable plate 9 slidably attached along the stays 3. By pressing the two disc-shaped cavities 11a, 1
This is a device capable of forming 1b and simultaneously molding two discs with a central hole such as a compact disc and a video disc.

A fixed mold 13 is attached to the fixed plate 7 by tightening bolts (not shown). In addition, movable plate 9
Also, the movable mold 15 is tightened by bolts (not shown).
Is attached. Then, two cavity members 17 are provided so as to face the joining surfaces of the molds 13 and 15 respectively.
Also, a, 17b, 19a and 19b are attached so as to face each other by bolt fastening. The above-mentioned cavities 11a and 11b are formed as spaces between the facing cavity members 17a-19a and 17b-19b. In addition, each cavity member 17a, 17b, 19a, 19b
A cooling groove is provided in the.

First, the structure on the fixed mold 13 side will be described. The fixed mold 13 further includes a cavity member 17
Sprue bushes 21a, 2 open at the center of a, 17b
1b is provided. This sprue bush 21a, 2
Injection ports 23a and 23b for injecting the resin into the cavities 11a and 11b are provided at the center of the 1b.
The front ends of the sprue bushes 21a and 21b are spherical recesses 25a and 25b, which form the tips of the injection ports 23a and 23b.

At the rear ends of the sprue bushes 21a and 21b, there are respectively injection nozzle units 27 fitted to the fixed platen 7.
a and 27b are in contact with each other. Injection nozzle unit 27
The a and 27b mainly include resin injection paths 29a and 29b communicating with the injection ports 23a and 23b. A branch passage unit 33 having a branch passage 31 connecting the resin injection passages 29a and 29b is arranged at the rear ends of the injection nozzle units 27a and 27b. Further, an introduction path unit 37 having a resin introduction path 35 which is in communication with the center of the branch path 31 is further arranged at the rear end. The branch passage unit 33 and the introduction passage unit 37 are pressed toward the rear ends of the injection nozzle units 27a and 27b by the fixing member 39, and are assembled in the fixing plate 7.

The introduction path unit 37, the branch path unit 33, and the injection nozzle units 27a and 27b are assembled in the fixed platen 7, so that the molten resin heating and pressure-feeding device 41 as a molten resin supply source to each cavity 11 can be used.
A molten resin injection path portion (hot runner) up to a and 11b is configured. As a result, a single molten resin heating and pressure-feeding device 41 simultaneously provides a plurality of cavities 11a and 11b.
It becomes possible to inject the molten resin into.

On the other hand, the introduction path unit 37, the branch path unit 33, and the injection nozzle units 27a and 27b are
Electric heating members 43, 45, 47a, 47b are provided respectively. Each of these electric heating members 43, 45, 47
a and 47b are connected to the hot runner controller 49 shown in FIG.

The hot runner controller 49 includes a first output section 51 connected to the electric heating member 43 of the introduction path unit 37, a second output section 53 connected to the electric heating member 45 of the branch path unit 33, and each. Injection nozzle unit 2
It is provided with a third output portion 55a and a fourth output portion 55b connected to the electric heating members 47a and 47b of 7a and 27b. Further, it is provided with one power supply input unit 57, and is configured to be able to independently supply power to each of the output units 51, 53, 55a, 55b by an internal circuit.

The output units 51, 53, 55a and 55b are
Independent current temperature display portions 61, 63, 65a, 65
b, the temperature detected by a temperature sensor (not shown) attached to each of the units 37, 33, 27a, 27b is displayed moment by moment. The first and second output units 51 and 53 are configured to perform voltage control based on temperature control conditions preset in the temperature setting memories 67 and 69. Further, the third and fourth output sections 55a and 55b are configured so that the temperature control conditions can be arbitrarily set via a slidac or the like by operating the voltage control dials 71a and 71b.

Next, the structure of the movable mold 15 side will be described. For simplicity, only one of the cavities 11a will be described, but if the subscript "a" in the following description is changed to "b", the structure of the other cavity 11b can be directly described. As shown in FIG. 3, the cavity member 19a of the movable mold 15 is provided with a stamper 73a for forming an information surface of a compact disc or a video disc, as shown in FIG.
It is fixed by a and the inner hole pressing member 77a. Therefore, the cavity 11a is accurately formed in a disc shape between the cavity member 17a on the fixed mold 13 side and the stamper 73a.

Behind the movable platen 9, the movable platen 9 is fixed.
A mold clamping ram 79 that moves forward and backward with respect to is fixed by bolting. The mold clamping ram 79 is connected to a piston inserted into a mold clamping cylinder (not shown), and has a function of sliding the movable plate 9 forward and backward along the stay 3. As a result, the movable mold 15 becomes the fixed mold 13.
The mold closing, pressing, and mold opening operations can be performed on.

The movable platen 9 is formed with a gate cut cylinder 81a penetrating it. The gate cut cylinder 81a is concentric with the disk center of the cavity 11a. The mold clamping ram 79 is provided with a small-diameter ejector cylinder 83a that is concentrically communicated behind the gate cut cylinder 81a. Both cylinders 81a, 83
The space between "a" is partitioned by a partition member 85a.

A hollow gate cut piston 87a having a thick center is fitted in the gate cut cylinder 81a. The ejector cylinder 83a penetrates the partition member 85a, and the gate cut piston 87a.
An ejector piston 89a that is inserted through the center hole of the is fitted. Further, each cylinder 81a, 83a is provided with a hydraulic pressure supply / discharge passage 96a, 97a, 98a, 99a to each of the two cylinder chambers 91a, 92a, 93a, 94a. These hydraulic pressure supply / discharge paths 96a to 99a are connected to a hydraulic pressure source (not shown).

A punch 107a is inserted in the movable mold 15. The punch 107a is advanced so as to project into the cavity 11a by pressing the punch rear end 103a by the advancing side abutment surface 101a of the gate cut piston 87a, and when the punch rear end 103a is not pressed, Is retracted from the cavity 11a by the elasticity of the spring 105a. Punch 107a
Is assembled by inserting it through the center of the inner hole pressing member 77a so as to move forward and backward along the center line of the disk of the cavity 11a.

The punch 107a is, as shown in FIG.
It has a cylindrical portion 109a having the same outer diameter as the inner diameter of the center hole of the molded disk, and a tip convex portion 111a protruding toward the concave portion 25a of the sprue bush 21a. Then, when the punch 107a advances to the maximum forward position, the tip convex portion 111a comes into close contact with the recess 25a, and the cylindrical portion 109a fits into the central hole 115a of the peripheral block 113a around the sprue bush 21a. As a result, a through hole is formed in the disc and the ejection port 23a is formed.
To block. In addition, the tip convex portion 111a of the punch 107a
Need not be in close contact with the recess 25a at the time of maximum projection. This is because the injection port 23a can be closed by fitting the cylindrical portion 109a into the surrounding block 115a.

The punch 107a is further hollow, and the ejector pin 117a is inserted therein. As shown in FIG. 3, the ejector pin 117a includes the ejector pin rear end projection 119a and the ejector piston 89a.
The ejector piston front end projection 121a of a is moved forward so as to project into the cavity 11a, and when the ejector pin rear end projection 119a is not pressed, it is retracted from the cavity 11a by the elasticity of the spring 123a. To be made. The ejector pin 117a is provided with a collar 125a slightly forward of the ejector pin rear end projection 119a in order to receive the elastic force of the spring 123a.

A product projecting collar 127a is fitted on the cylindrical portion 109a of the punch 107a. The product projecting collar 127a includes a pin 129a penetrating the collar 125a of the ejector pin 117a. Pin 1
29a, the pin end 131a, the ejector piston 8
The ejector piston front end projection 121a of 9a is pushed forward by a pushing flange 133a provided slightly rearward so as to project into the cavity 11a. On the other hand, when the pin end 131a is not pressed, the elastic force of the spring 123a is received through the flange 125a of the ejector pin 117a, and the ejector pin 117a is retracted from the cavity 11a.

The movable die 15 is provided with these punches 1.
07a, ejector pin 117a, product protruding collar 12
A space for housing 7a and the like is formed. In this space, a partition member 135a with the gate cut cylinder 81a is provided.
A moving position determining member 137a that determines the maximum forward position of the punch 107a and a bush 139a that is remodeled between the product projecting collar 127a and the inner hole pressing member 77a are incorporated and fixed. Moving position determining member 137
“A” also has the function of determining the retracted position of the product protruding collar 127a. The partition member 135a also has the function of determining the retracted position of the ejector pin 117a.

Next, the step of molding a disk having a central hole by the injection molding apparatus 1 will be described. First, as shown in FIG. 3, the mold clamping ram 79 is advanced to close the movable mold 15, and the mold is clamped to form the cavity 11a. Then, the molten resin is injected and filled into the cavity 11a. Then, after a predetermined time corresponding to completion of filling, as shown in FIG.
In order to supply the pressure oil to the lower cylinder chamber 92a of 1a and to discharge the pressure oil from the upper cylinder chamber 91a,
The hydraulic pressure supply / discharge paths 97a and 96a are adjusted. This adjustment is executed by a main controller (not shown). Specifically, the main controller uses a timer to determine that a predetermined time has elapsed from the completion of mold clamping, and the respective hydraulic pressure supply / discharge passages 97
The valves a and 96a (not shown) are drive-controlled. In addition,
The time set in advance at the time of trial manufacture of a disk is set in the timer. During this time, the injection nozzle unit 27
voltage control dial 71 for the electric heating member 47a
It is changed by adjusting the injection start timing and the filling completion timing by adjusting a.

When the hydraulic pressure supply / discharge control of the gate cut cylinder 81a is executed in this manner, as shown in the lower part of FIG.
The punch 107a is pushed by the gate cut piston 87a at its rear end to project forward into the cavity 11a, and
3a is closed to prevent further injection of molten resin into the cavity 11a. In addition, this punch 107
A part of the molten resin is pushed back into the injection port 23a from the cavity 11a as the a moves forward. This is because the resin in the cavity 11a is not yet solidified and is in a molten state when the filling is completed. The forward movement of the punch 107a not only cuts off the resin supply to the cavity 11a, but also has the function of forming a central hole in the resin in the cavity 11a. In the conventional center hole opening method, the punch hole is formed after the resin is solidified, but in the present embodiment, the opening work is performed during the melting of the resin.

As described above, since the central hole is opened during the melting of the resin and the cavity 11a is closed to prevent the further injection of the resin, the cavity 11a is prevented.
The internal pressure of will not rise too much. Therefore, residual strain or the like does not occur in the manufactured disc.

In the state shown in FIG. 5, the solidification of the resin is awaited. This is also for the solidification time required in the disk prototype,
The time is set in a predetermined timer of the main controller. After the solidification time has elapsed, as shown in FIG. 6, the mold clamping ram 79 is moved backward to open the mold. Movable mold 15
A solidified disk 141a is attached to the surface of the cavity member 19a via the stamper 73a. Further, a solidified unnecessary portion 143a is attached to the tip of the punch 107a. In addition, each hydraulic pressure supply / discharge path 96a
.About.99a are controlled by the supply / discharge stopping state.

Next, as shown in FIG. 7, a hydraulic pressure supply / discharge passage 99a is provided so that the pressure oil is supplied to the lower cylinder chamber 94a of the ejector cylinder 83a and the pressure oil is discharged from the upper cylinder chamber 93a. , 98a are adjusted. This adjustment is also performed by the main controller using the hydraulic pressure supply / discharge paths 99a, 9a.
This is executed by controlling the drive of the valve 8a (not shown).

When the hydraulic pressure supply / discharge control of the ejector cylinder 83a is executed in this manner, first, as shown in FIG. 7, only the ejector pin 117a projects forward and the unnecessary portion 143 is ejected.
a is pushed out from the tip of the punch 107a and dropped.
Subsequently, as shown in FIG. 8, the product projecting collar 127a starts to advance together with the ejector pin 117a, and the disc 1
41a is peeled off from the stamper 73a. Disc 1 peeled off
41a is taken out by a product taking-out arm 147a equipped with a disc suction board 145a.

On the other side of the cavity 11b, the operations shown in FIGS. 3 to 8 are independently executed at almost the same time. Thus, according to the injection molding apparatus 1 of the present embodiment, two discs can be manufactured at the same time, and the production efficiency can be doubled. Moreover, it is not necessary to increase the molten resin heating and pressure-feeding device 41 required for that purpose. Moreover, since the injection completion timing can be controlled independently for each of the cavities 11a and 11b, the finished disk will not have a defective shape due to insufficient resin and residual distortion due to excessive resin. Therefore, it is possible to not only double the production efficiency but also suppress the defective product generation rate to the minimum.

Further, each injection nozzle unit 27a, 27
Since the electric heating members 47a and 47b can be respectively arranged in b to control the temperature independently, it is possible to start the injection substantially at the same time even when there is a slight difference in shape or size, and to simultaneously press the cavities 11a and 47b. It is also possible to match the injection completion time to 11b.

Further, since the hot runner portion is long because it passes through the branch passage, the hot runner portion is constructed by assembling the introduction passage unit 37, the branch passage unit 33 and the injection nozzle units 27a and 27b in the fixed platen 7. In addition, since the electric heating member 45 for the branch passage unit 33 and the electric heating member 43 for the introduction passage unit 37 are respectively arranged, the flow of the resin does not deteriorate in the middle.

In addition to these functions and effects, a hot runner unit is constructed by being assembled in the fixed platen 7, and the gate cut cylinder 81a and the ejector cylinder 83a are incorporated in the movable platen 9 and the mold clamping ram 79. As a result, the entire device can be made compact.

Further, since the hot runner unit is not built in the fixed mold 13 but divided into a plurality of unit parts and assembled in the fixed plate 7, disassembly and assembly is easy. In addition, since the maintenance of the hot runner unit can be performed from the side of the stationary platen 7, there is an advantage that the workability is good.

Although the embodiments of the present invention have been described above, it is needless to say that the present invention is not limited to these embodiments and can be implemented in various modes without departing from the scope of the invention. Absent. For example, the number of disks to be manufactured at the same time may be further increased to supply resin from one molten resin heating and pressure feeding device to three or more cavities. Any plate-shaped product having a hole in the center may be used, and the device may be configured as a plate-shaped product having a square hole in an elliptical plate. The application of the product is not limited to compact discs and video discs.

[0045]

As described above, according to the injection molding apparatus for a plate with a hole of the present invention, the molten resin is simultaneously sent from one molten resin pressure feeding device to a plurality of cavities through a plurality of injection nozzles. It is possible to press and form a plurality of discs at the same time, and it is possible to reduce the occurrence of defective products. As a result, the production efficiency can be significantly improved.

According to the apparatus of the second aspect, the above-mentioned remarkable effect can be achieved by simple control by independently controlling the injection start condition. Further, according to the apparatus of the third aspect, it is possible to surely achieve the above-mentioned remarkable effect by independently controlling the pressure feeding condition on the way.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an entire main part of an injection molding apparatus according to an embodiment.

FIG. 2 is a front view showing an outline of a hot runner control unit of the injection molding apparatus of the embodiment.

FIG. 3 is a cross-sectional view showing a state at the start of molding of one cavity of the injection molding apparatus of the embodiment.

FIG. 4 is an explanatory diagram illustrating a structural state and an operational state regarding hole opening and cavity closing of the injection molding apparatus according to the embodiment.

FIG. 5 is a cross-sectional view showing an operating state at the end of injection with respect to one cavity of the injection molding apparatus of the embodiment.

FIG. 6 is a cross-sectional view showing the mold open body after completion of solidification for one cavity of the injection molding apparatus of the embodiment.

FIG. 7 is a cross-sectional view showing a state of an initial stage of product taking-out for one cavity of the injection molding apparatus according to the embodiment.

FIG. 8 is a cross-sectional view showing a state of a final stage of taking out a product in one cavity of the injection molding apparatus of the embodiment.

[Explanation of symbols]

1 ... Injection molding apparatus, 7 ... Fixed platen, 9 ... Movable platen, 11a, 11b ... Cavity, 13 ... Fixed mold, 15 ... Movable mold, 23a, 23b. ..Ejection ports, 25a, 25b ... Recesses, 27a, 27b ...
Injection nozzle unit, 33 ... Branch path unit, 37
・ ・ ・ Introduction path unit, 41 ・ ・ ・ Molded resin heating and pressure feeding device, 43, 45, 47a, 47b ・ ・ ・ Electrical heating member,
49: Hot runner controller, 51, 53,
55a, 55b ... 1st-4th output part, 81a ...
Gate cut cylinder, 83a ... Ejector cylinder, 87a ... Gate cut piston, 89a ...
Ejector piston, 91a to 94a ... Cylinder chamber, 96a to 99a ... Hydraulic pressure supply / discharge passage, 101a ...
For the time being on the forward side, 103a ... Punch rear end, 107a, 1
07b ... Punch, 109a ... Cylindrical part, 111a
... Tip protrusion, 113a ... Surrounding block 117
a ... ejector pin, 119a ... ejector pin rear end projection, 121a ... ejector piston front end projection, 125a ... collar, 127a ... product projecting collar, 129a ... pin, 131a ... Pin end, 1
33a ... Pressing collar, 141a ... Disc, 143
a: unnecessary portion.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location G11B 7/26 7215-5D // B29L 7:00 4F

Claims (3)

[Claims] 1. A fixed mold and a movable mold having a cavity surface for forming a cavity for molding a plate-like body between the joint surfaces when the mold is closed, an injection nozzle for injecting a molten resin into the cavity, A hole forming member that protrudes into the cavity, injects molten resin from the injection nozzle to form a plate-shaped body, and forms a hole in the plate-shaped body by protruding the hole forming member. An injection molding device for a plate-shaped body having a hole for molding a plate-shaped body, wherein the fixed mold and the movable mold form a plurality of independent cavities for molding the plate-shaped body between the joint surfaces when the mold is closed. The injection nozzle has a surface shape, and each of the injection nozzles is provided with an injection port opened at the center of each hole of each of the plurality of cavities, and at least two injection nozzles are provided from the same molten resin supply source. Via the branch path to the resin introduction path The piercing member is arranged so as to project into the cavity so as to face each of the injection nozzles, and at the time of projecting, a hole is opened at the pre-drilled position and an injection port from the injection nozzle to the cavity is formed. An injection molding device for a plate-shaped body with holes, which has a closed tip shape and is provided with an independent drive control means for independently controlling the drive of the hole-opening member for each cavity. 2. The injection molding apparatus for a plate-shaped body with holes according to claim 1, wherein a heating member is provided to each injection nozzle connected to a resin introduction path from the same molten resin supply source through a branch path. An injection molding device for a plate-shaped body with holes, which is provided with an independent temperature control means for independently controlling the temperature of each heating member for each injection nozzle. 3. The injection molding device for a plate-shaped body with holes according to claim 2, wherein a resin supply path from the branch path to the tip of each injection nozzle is provided.
The branch passage unit and each injection nozzle unit are assembled in a fixed mold, and each heating member is provided for each injection nozzle unit, and an independent heating member is also provided for the branch passage unit. An injection molding device for a plate-shaped body with holes, further comprising branch path temperature control means for controlling the temperature separately from each injection nozzle unit.