JPH1128749A - Cooling of injection mold for toner cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To well cool a molten resin to enhance production efficiency by forming a cooling baffle water pipe circuit to a core piece edge part incapable of being provided with cooling baffle water holes forcibly cooling and solidifying the heated molten resin injected into a mold because a mechanical structure is provided in the core piece of the mold. SOLUTION: A baffle water pipe circuit 26 bent in a vertical direction along the baffle plate 29 extending in a vertical direction is formed to the core piece of a movable template 14 and an inner slide pin 21 is fixed to the upper part of the drive plate 22 driving the hydraulic cylinder 23 of an inner slide mechanism 20. The baffle plate 30 extending in a horizontal direction is provided to the core piece above the inner slide pin 21 to form a horizontally bent baffle water pie circuit 27. By this constitution, the edge parts 15a, 15b of the core piece on a movable side are respectively suitably cooled. The temp. of a mold is uniformly kept to reduce the warpage defomation of an injection-molded product and the molded product can be suitably produced by a short cycle and the lowering of the molding accuracy of the product can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die for a plastic container of a toner cartridge. The present invention relates to a method of cooling an injection mold that can be installed.

[0002]

2. Description of the Related Art In a conventional injection molding die for a toner cartridge, when there is a mechanical structure such as an inner slide mechanism inside a core piece of a movable mold plate, a water pipe hole for cooling is usually easily formed. Place it where it can be processed, or
In order to improve production efficiency, a water pipe hole is installed as close as possible to a required place, and a copper material or the like having a high thermal conductivity is used as the material of the movable core piece.

[0003]

However, in such a conventional injection mold, the size of the movable core piece and the limit of the installation area of the cooling circuit, etc., and in particular, the mechanical mechanism such as the inner slide mechanism is required. Since cooling provided at the edge of the core piece is not achieved because it is provided inside the core piece of the movable mold plate, it is not possible to expect a sufficient improvement in cooling efficiency, and therefore, an improvement in production efficiency is also expected. There is a drawback of not being able to do so.

[0004] For example, as an example of a conventional injection mold of this type, an injection mold as shown in FIG. 3 of the drawings is known. As shown in the figure, the injection mold 100 includes a fixed mold 102 and a movable mold 103, and the fixed mold 102 is mounted on a fixed mold mounting plate 104.
The movable mold 103 is attached to a movable mold mounting plate 105 via a spacer block 106, and a cavity 107 for a product having a required shape is provided between the fixed mold 102 and the movable mold 103. Are formed. The fixed mold 102 includes a fixed mold plate 108, a spool member 109, and cavity pieces 110 and 111.
A spool 112 for injecting the molten resin into the spool 07 is provided on the spool member 109.

The movable mold 103 is connected to the movable mold plate 114 supported by the spacer block 106 and the core block 1.
The ejector plates 117 and 118, the ejector pins 119, and the drive plate 122 are provided. The movable mold plate 114 is provided with a plurality of ejector pins 119 for extruding the product A, so that the molded product A can be extruded. Further, the fixed mold 102 has a cavity 10.
7, a water pipe hole 124 is provided along the cavity 107, and the movable mold 103 is provided with the cavity 107.
The baffle water pipe circuits 128 and 129 for cooling the mold for cooling the mold are formed near the
Is in communication with

Further, an inner slide mechanism 120 as a mechanical structure provided on the movable mold 103 includes an inner slide pin 121, a drive plate 122 to which the inner slide pin 121 is fixed, and a drive Plate 122
, And a drive plate 122 to which the inner slide pin 121 is fixed is driven by the hydraulic cylinder 123.

A water pipe hole 124 for cooling the mold is provided in the fixed mold 102 in the vicinity of the cavity 107 for the product A, along the cavity 107 and substantially parallel to the cavity 107, and the fixed mold plate 108 and the cavity piece. The hole 110 is formed as a continuous hole in the cavity piece 111, the fixed mold plate 108. In the mold cooling baffle water pipe circuits 128 and 129 of the movable mold 103, water pipe holes 126 and 127 are provided near the cavity 107 in a direction substantially parallel to the bottom of the cavity 107 and substantially parallel to the bottom. 115 is provided so as to communicate with a horizontally extending water pipe hole 125 of the movable mold plate 114, and the baffle plate 1 is inserted into the vertical water pipe holes 126 and 127.
30 and 131 are provided, and the baffle water pipe circuit 12 is provided.
8, 129 are formed. In this specification, the processing of holes such as water pipe holes is a processing generally performed as is well known to those skilled in the art, and thus will not be described in detail here.

However, in such conventional injection molds, the core is particularly limited due to the size of the core piece on the movable side of the cavity, the limit of the installation area of the cooling circuit by the water pipe hole such as the edge of the core piece, and the like. Since good cooling of the edge portion of the bridge is not performed, it is not possible to expect a sufficient improvement in cooling efficiency, and therefore, there is a drawback that an improvement in production efficiency cannot be expected. In particular, as a limit of the installation area of the cooling circuit, when a mechanical mechanism such as an inner slide mechanism is provided on the core piece of the movable mold and a cooling circuit cannot be provided at the edge of the core piece, Such an edge cannot be cooled sufficiently.

Accordingly, an object of the present invention is to provide a baffle water pipe circuit by providing a water pipe hole at the edge of the core piece of the movable mold even if the mold structure is complicated, in order to solve such a conventional problem. An object of the present invention is to provide a method of cooling an injection mold for a toner cartridge, which is suitably formed and can be cooled well.

[0010]

In order to achieve the above-mentioned object, a method for cooling an injection mold for a toner cartridge according to the present invention is provided in an injection mold for a plastic container of a toner cartridge. A cooling baffle water pipe circuit is formed at an edge of the core piece where a mechanical structure is provided inside the piece and a cooling baffle water hole for forcibly cooling and solidifying the heated molten resin injected into the mold cannot be installed. And cooling the edge portion.

In a preferred embodiment of the present invention, the cooling method of the injection mold for a toner cartridge is characterized in that the cooling baffle water pipe circuit is provided with a baffle plate in a water pipe hole and bent.

In the method for cooling an injection mold for a toner cartridge according to the present invention, the cooling baffle water pipe circuit is formed by providing a baffle plate in a water pipe hole extending horizontally at an edge portion of the core piece. It is characterized by the following.

Further, in the method of cooling an injection mold for a toner cartridge according to the present invention, in addition to the baffle water pipe circuit for cooling, a baffle plate is provided in a water pipe hole extending perpendicularly to the other edge of the core piece. A cooling baffle water pipe circuit is further formed.

Further, according to the present invention, there is provided a method for cooling an injection mold for a toner cartridge, wherein a cooling plate formed by providing a baffle plate in a water pipe hole extending vertically and horizontally at both edges of the core piece. A baffle water pipe circuit is provided in combination.

Further, according to the method of cooling an injection mold for a toner cartridge of the present invention, when the mold has a large core piece, the mold piece is divided into two core pieces and the side where the mechanical structure is provided. A cooling baffle water pipe circuit is formed on the core piece.

Further, according to the method of cooling an injection mold for a toner cartridge of the present invention, an O-ring is provided between each of the two core pieces and between each of the core pieces and the movable mold so as to be sealed in a watertight manner. It is characterized by having been done.

In the method for cooling an injection mold for a toner cartridge according to the present invention, the core piece is divided into a core piece having a length of 20 m.
It is characterized in that it has a size of at least m-square.

According to the method of cooling the injection mold for a toner cartridge of the present invention, in the injection mold for a plastic container of a toner cartridge, the corner extends over an edge or the like of a movable core piece of the mold. The baffle water pipe circuit arranged in parallel with the product cavity so as to cool the corners uniformly so that the injection mold is cooled appropriately and the mold temperature is kept uniform, so that the Warpage deformation is reduced, and production can be suitably performed in a shorter cycle than before.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cooling apparatus for carrying out a method for cooling an injection mold for a toner cartridge according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2 of the drawings, in the cooling circuit of the injection mold for a toner cartridge of the present invention, the plastic container of the toner cartridge having the cross-sectional shape shown is injection-molded. An injection mold is shown.

As shown in the figure, the injection mold 1 according to the present invention mainly comprises a fixed mold 2 and a movable mold 3.
The fixed mold 2 is mounted and supported on a fixed mold mounting plate 4.
The movable mold 3 is mounted and supported on a movable mold mounting plate 5 via a spacer block 6.
A cavity for a product A having a required shape, that is, a cavity 7 is formed between the movable mold 3 and the movable mold 3.

The fixed mold 2 comprises a fixed mold plate 8 attached to the fixed mold attachment plate 4, a spool member 9, and cavity pieces 10, 11, and a spool for injecting the molten resin into the cavity 7. 12 is provided on the spool member 9.

On the other hand, the movable mold 3 is a movable mold plate 1 supported by a spacer block 6 on a movable mold mounting plate 5.
4 and a core piece 15, an ejector plate 17,
18, an ejector pin 19 and a drive plate 22 are provided. The movable mold plate 14 is provided with a plurality of ejector pins 19 for extruding the product A, so that the molded product A can be extruded from the movable mold 3 and released when the mold is released. It consists of

An ejector pin 19 for extruding the product A from the movable mold 3 has a head 19a, and the head 19a is held between the upper ejector plate 17 and the lower ejector plate 18. Then, the ejector pins 19 are fixed to the ejector plates 17 and 18.

Further, the fixed mold 2 and the movable mold 3 are provided near the cavity 7 for cooling the injection mold 1.
The water pipe hole 24 is provided in the fixed mold 2, and the water pipe holes 25 of the baffle water pipe circuits 26 and 27 are provided in the movable mold 3.

First, in the fixed mold 2, the water pipe hole 24
The supply port and the discharge port are provided on the fixed side mold plate 8. The cavity piece 10 and the cavity piece are substantially parallel to the cavity 7 along the cavity 7 for the product A so as to connect the supply port and the discharge port. 11 is formed as a continuous hole.

In the movable mold 3, the water pipe hole 25 is formed.
Is provided with a supply port and a discharge port on the movable mold plate 14,
Baffle water pipe circuit 2 connecting these supply and discharge ports
6 and 27 are formed as holes continuous with the core piece 15. In particular, in the movable-side core piece 15, the baffle plate 2 extending in the vertical direction and the horizontal direction in the drawing is shown.
Baffle water pipe circuits 26, 27 bent through 8, 29
Are provided to enhance the cooling effect. Such baffle water pipe circuits 26 and 27 enhance the cooling effect of the core piece 15 and further enhance the cooling effect when the inner slide mechanism 20 as a mechanical structure is provided.

For example, when the inner slide mechanism 20 is provided as a mechanical structure, first, as shown in FIG. 1, a baffle plate 29 extending vertically to the core piece 15 of the movable mold plate 14 is provided. A baffle water pipe circuit 26 is formed that bends vertically along the inner slide mechanism 2.
The inner slide pin 21 is fixed to the upper portion of the drive plate 22 driven by the
A baffle plate 29 extending in the horizontal direction is provided on the core piece 15 above the inner slide pin 21, thereby forming a baffle water pipe circuit 27 bent in the horizontal direction. Part 15a,
15a are each suitably cooled.

The inner slide mechanism 20 as a mechanical structure provided in the movable mold 3 has an inner slide pin 21 and a drive plate 22 to which the inner slide pin 21 is fixed, as shown in FIG. And a hydraulic cylinder 23 for driving the driving plate 22, and the driving plate 22 to which the inner slide pin 21 is fixed is driven by the hydraulic cylinder 23. Further, the inner slide pin 21 is configured such that an end thereof is fitted and locked to a corner b of the product A which is injection-molded.
The inner slide pin 21 is separated from the core piece 15 of the movable mold 3 by the ejector pin 19.
It is made to be pushed out from.

Further, as shown in FIG. 4, a hose 3 is connected to the water pipe holes 24 and 25 of the injection mold 1 as shown in FIG.
1, the temperature controller 32 and the flow meter 33 are connected,
A medium whose temperature is adjusted, for example, water, is supplied to cool the fixed-side cavity pieces 10 and 11 and the movable-side core piece 15 suitably.

FIG. 2 shows that the movable-side core piece is, for example, 20 mm.
In the case where the core piece is divided into two such as a first core piece 15 and a second core piece 16 and is communicated with a water pipe hole 25 of the movable mold plate 14 as shown in the figure. A baffle water pipe circuit 28 is provided on the first and second core pieces 15 and 16. The baffle water pipe circuit 28 is connected to the second core piece 1
6, a baffle plate 30 is provided in the baffle water pipe circuit 28 so as to bend the water pipe hole, so that the edge portions 15a, 16a of the core pieces 15, 16 are cooled actively. Accordingly, by taking the resin heat at the corner a of the container of the toner cartridge, the warpage deformation at the time of molding the product A can be reduced, and the accuracy of the product A can be prevented from lowering. In this case, it is preferable to provide an O-ring 34 between the movable mold plate 14 and the first and second core pieces 15 and 16 as shown in FIG.

As described above, when the container of the toner cartridge is injection-molded, the injection molding die 1 is attached to the injection molding machine, and the resin heated and melted from the nozzle of the injection molding machine is injected via the spool 12 into the injection molding die. The product A is injected into the mold 1 to be injection-molded. Baffle water pipe circuits 26, 27 and 28 are provided along the cavity 7 in the fixed mold 2 and the movable mold 3 around the cavity 7 in the injection molding mold 1, and as a mechanical structure. Even if the inner slide mechanism 20 is provided on the core piece 15, the baffle water pipe circuits 26, 27, 28 can be suitably provided on the core pieces 15, 16, so that the whole of the core pieces 15, 16 can be uniformly and favorably formed. , The mold temperature is uniformly cooled, the warpage of the product A is reduced, the product can be produced in a short cycle, and the molding accuracy of the injection-molded product is prevented from lowering. I can do it.

[0033]

As described above, according to the method for cooling an injection mold for a toner cartridge of the present invention, in a plastic container injection mold for a toner cartridge, the edge of a movable core piece of the injection mold is provided. Baffle water pipe circuits arranged in parallel along the product to cool the corners evenly over the corners of the part, etc., so that the injection mold is suitably cooled and the mold temperature is kept uniform. In addition to reducing the warpage of injection molded products,
Production can be suitably performed in a shorter cycle than before, and a reduction in molding accuracy of a product to be injection molded can be prevented.

Further, according to the present invention, the cooling baffle water pipe circuit is formed by providing the baffle plate in the water pipe hole extending horizontally at the edge of the core piece, so that the cooling baffle water pipe circuit is simple and easy. Can be formed.

Further, according to the present invention, in addition to the cooling baffle water pipe circuit, a cooling baffle water pipe circuit comprising a baffle plate provided in a water pipe hole extending vertically at the other edge of the core piece is further formed. Therefore, not only one edge but also the other edge of the core piece can be cooled well.

Further, according to the present invention, the cooling baffle water pipe circuits formed by providing baffle plates respectively in water pipe holes extending in the vertical direction and the horizontal direction at both edges of the core piece are provided in combination. The core piece including both edges of the piece can be cooled well.

According to the present invention, when the core piece of the movable mold is large, the mold piece is divided into two core pieces, and the cooling baffle water pipe circuit is provided on the core piece on which the mechanical structure is provided. As a result, even if a large core piece is provided with a mechanical structure, the entire core piece can be suitably cooled.

Further, according to the present invention, the O-rings are provided between the two core pieces and between each core piece and the movable mold so as to be sealed in a watertight manner. There is no leakage of the heated molten resin between the mold and the mold.

According to the present invention, since the division of the core piece is a case where the core piece is 20 mm square or more, any core piece can be cooled well.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a cooling circuit of an injection mold for a toner cartridge of the present invention.

FIG. 2 is a detailed view of a cooling circuit of the injection mold for a toner cartridge of the present invention.

FIG. 3 is a configuration diagram showing a conventional cooling circuit.

FIG. 4 is a diagram showing connection of constituent devices when the injection mold is cooled.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 injection molding die 2 fixed die 3 movable die 4 fixed die mounting plate 5 movable die mounting plate 6 spacer block 7 cavity 8 fixed die plate 9 spool member 10 cavity piece 11 cavity piece 12 spool 14 Movable Template 15 Core Piece 15a Edge 16 Core Piece 16a Edge 17 Ejector Plate 18 Ejector Plate 19 Ejector Pin 20 Inner Slide Mechanism 21 Inner Slide Pin 22 Drive Plate 23 Hydraulic Cylinder 24 Water Pipe Hole 25 Water Pipe Hole 26 Baffle Water Pipe Circuit 27 baffle water pipe circuit 28 baffle water pipe circuit 29 baffle plate 30 baffle plate 31 hose 32 temperature controller 33 flow meter 34 O-ring A product a corner

Claims (8)

[Claims] In an injection molding die for a plastic container of a toner cartridge, a mechanical structure is provided inside a core piece of the die, and a heat-melted resin injected into the die is forcibly cooled and solidified. A cooling baffle water pipe circuit is formed at an edge portion of the core piece in which a cooling baffle water hole to be provided cannot be provided, and the edge portion is cooled, thereby cooling the injection mold for a toner cartridge. 2. The method of cooling an injection mold for a toner cartridge according to claim 1, wherein the cooling baffle water pipe circuit is formed by providing a baffle plate in a water pipe hole and bending. 3. The injection molding for a toner cartridge according to claim 1, wherein the cooling baffle water pipe circuit is formed by providing a baffle plate in a water pipe hole extending horizontally at an edge of the core piece. Mold cooling method. 4. In addition to the cooling baffle water pipe circuit,
2. The injection molding die for a toner cartridge according to claim 1, further comprising a cooling baffle water pipe circuit formed by providing a baffle plate in a water pipe hole extending vertically to the other edge of the core piece. Cooling method. 5. A cooling baffle water pipe circuit formed by providing baffle plates in water pipe holes extending in the vertical direction and the horizontal direction at both edges of the core piece, respectively. A method for cooling an injection mold for a toner cartridge as described in the above. 6. A cooling baffle water pipe circuit is formed on the core piece on the side where the mechanical structure is provided, when the core piece of the mold is large, divided into two core pieces. The method for cooling an injection mold for a toner cartridge according to claim 1, wherein: 7. The toner cartridge according to claim 5, wherein an O-ring is provided between each of the two core pieces and between each of the core pieces and the movable mold so as to be sealed in a watertight manner. Cooling method for injection molding die. 8. The division of the core piece is such that the core piece is 20 mm.
7. The case of a size larger than a corner.
A method for cooling an injection mold for a toner cartridge as described in the above.