JPH11300763A - Method for applying mold release agent and mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve mold release properties by fitting a mold release agent spraying nozzle to at least the movable side mold of a mold for molding a molding material and spraying a mold release agent toward the mold by the nozzle. SOLUTION: After mold opening in which angular pins 5 are extracted from slide cores 14, 14 respectively, nozzles 16, 17 which have been closed so far by the slide cores 14, 14 are opened completely with a mold ejected. Accordingly, even after the molding being removed from a mold 1, a mold release agent 18 is kept to be sprayed from the nozzles 16, 17 to the cavities 19 of the slide cores 14, 14 respectively. Since the mold release agent 18 is applied sufficiently even to corner parts, which are usually difficult to be coated with a mold release agent, can be coated enough with the agent 18 by the nozzles 16, 17, the mold release effect of the agent 18 improves. By fitting porous opened members such as porous bodies to the end parts of the nozzles 16, 17 as required, the mold release agent 18 can be atomized appropriately to improve spraying further.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of molding a molding material such as a synthetic resin or a synthetic rubber with a mold, and a method of applying a mold release agent to a cavity of the mold by spraying the mold material. And molds.

[0002]

2. Description of the Related Art Conventionally, various molding methods have been known as methods for processing synthetic resins, synthetic rubbers, and the like. As molding methods, injection molding, extrusion molding, hollow molding, vacuum molding, and roll molding are known. And various other molding methods.

[0003] The principle of the molding method is that it consists of three basic operations of melting, flowing, and solidifying the molding material, and is rational, high in productivity and capable of high quality production.

[0004] For example, in the injection molding method, a molded article must be released from a mold in the final step of a molding cycle and released from the mold. At this time, if the molded article is too close to the mold, When protruded, the molded article may be scratched, whitened, and in the worst case, destroyed. One of the methods for improving the releasability is to apply a release agent to the surface of the mold where the mold and the molding material come into contact, and to form a film on the surface of the mold to reduce the release resistance. There is a method of preventing the molding material from sticking to the mold.

[0005]

However, in such a molding method, the coating film of the release agent applied to the mold usually transfers to the molded product. It has disappeared and the releasability gradually deteriorates. Therefore, the standard process is to apply the release agent to the mold every shot or every few shots.

When the mold is opened, a spray gun, a brush, a rag, etc. are inserted into the mold to apply the release agent, so that the molding cycle becomes slow and prolonged, and the productivity becomes poor. Can be seen. In addition, since the mold release agent is applied from the side that is open when the mold is opened, the mold release agent may not be able to be applied to the inner part and corners of the mold. There is a problem that becomes worse.

[0007] Accordingly, an object of the present invention is to provide a method of applying a release agent and a method of improving the releasability by spraying a release agent toward a cavity of a mold in order to solve such a conventional problem. Is to provide a type.

[0008]

According to the present invention, there is provided a method of applying a release agent, comprising: spraying a release agent onto at least a movable mold of a mold for molding a molding material. A nozzle for spraying the release agent toward the mold by the nozzle for spraying the release agent.

Further, the method of applying a release agent of the present invention is characterized in that the release agent is sprayed in a mist toward the cavity of the mold by the nozzle.

Further, in the method of applying a release agent according to the present invention, a nozzle for spraying a release agent is provided on a mold plate to be molded using a slide core. A mold release agent is sprayed into the cavity of the slide core by the nozzle while moving the slide core together with the start of the mold opening movement of the slide core.

Furthermore, in the method of applying a release agent of the present invention, a nozzle for spraying a release agent is provided on a side surface of a tip portion of a hollow ejector pin, and the ejector pin is taken out from a mold. When the molded product is released from the mold, the release agent is sprayed into the cavity from the nozzle of the ejector pin.

The method of applying a release agent according to the present invention is characterized in that a member having fine holes is provided at the tip of the nozzle.

In the mold of the present invention, a release agent spray nozzle is provided on at least the movable side of the mold for molding a molding material, and the release agent is sprayed on the movable side by the release agent spray nozzle. It is characterized by spraying toward the mold and the fixed mold.

Further, the mold of the present invention is characterized in that the release agent is sprayed in a mist toward the cavity of the mold by the nozzle.

Further, the mold of the present invention is provided with a nozzle for spraying a mold release agent on a mold plate molded using the slide core, and when the mold is opened to take out a molded product, the slide core is removed. A mold release agent is sprayed into the cavity of the slide core by the nozzle while moving the slide core together with the start of the mold opening movement.

Further, in the mold of the present invention, a nozzle for spraying a release agent is provided on a side surface of a tip portion of a hollow ejector pin, and the ejector pin is formed by the ejector pin so as to take out a molded product from the mold. When releasing the product, the release agent is sprayed into the cavity of the mold by the nozzle while moving the ejector pin.

The die according to the present invention is characterized in that a member having a fine hole is provided at the tip of the nozzle.

As described above, according to the present invention, a method for applying a release agent and a mold are provided in a mold, a mold plate or a hollow ejector pin by providing a nozzle for spraying the release agent. Since the release agent is sprayed on the mold, the releasability can be improved, and a suitable molding method and a mold can be obtained.

Other objects and features of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0020]

7 to 11 show an injection molding method using an extrusion injection molding machine, which is one of the molding methods in which a mold release agent applying method using a mold according to the present invention is carried out. .

As shown in the figure, a mold 60 for molding a resin as a molding material comprises a fixed mold 61 and a movable mold 62, and an extrusion injection molding machine 63 is connected to the fixed mold 61. The nozzle of the extrusion injection molding machine 63 is connected to the fixed die 61. The extrusion injection molding machine 63 includes a heating cylinder 64 for plasticizing the resin material, a screw 65 provided in the heating cylinder 64, a heater 66 wound around the outer periphery of the heating cylinder 64, and the resin material to the heating cylinder 64. The hopper 67 is a storage container provided to supply the oil, a hydraulic cylinder 68 that advances the screw 65, and a hydraulic motor 69 that rotates the screw 65. The injection pressure and the injection speed are determined by adjusting the flow rate.

In such an injection molding machine 63, FIG.
As shown in the figure, first, the state of the mold clamping step is a step performed to close the fixed mold 61 and the movable mold 62 of the mold 60. In the injection molding, the mold injection pressure of the molding material is high. Therefore, a very strong mold clamping force is required, whereby the movable mold 62 is fastened and fixed to the fixed mold 61.

FIG. 8 is a view showing a state at the time of the injection step. The molding material at a certain temperature melted by the heating cylinder 64 is injected into the mold 60 by the advancement of the screw 65.

Next, FIG. 9 is a view showing a state during the pressure-holding step. After the injection is completed, the injection pressure is applied until the molten molding material in the mold 60 has a predetermined hardness. Held until

FIG. 10 is a view showing a state at the time of the cooling step. The injected molding material is indirectly satisfactorily cooled and solidified by the cooling water flowing through the mold 60. At the same time, melting and metering of the material are performed simultaneously, and the material is
And is guided into the heating cylinder 64 by the rotation of the screw 65. The introduced material starts melting by the heat of the resin itself due to the rotation of the screw 65 and the heater 66 of the heating cylinder 64, and is transferred to the tip of the screw 65.

FIG. 11 is a view showing a state during the mold opening step.
The material injected into the mold 60 is formed into a required shape in the mold 60, and the mold 60 is composed of a fixed mold 61 and a movable mold 62.
And separated. The molded product 70 is opened while being attached to the movable mold 62. The molded product 70 that has been opened and remains in the movable mold 62 of the mold 60 is automatically removed from the mold 60 by hydraulic pressure and a protruding mechanism inside the mold 60. At this time, the release agent is sprayed from a nozzle provided in the cavity of the movable mold 62 so as to open. Thus molded article 7
Even after 0 is removed from the mold 60, the release agent is sprayed into the cavity from the nozzle provided on the movable mold 62 and is sufficiently applied.

According to the release agent applying method and the mold of the present invention configured as described above, at least one of the fixed mold and the movable mold of the mold, preferably the mold is released to the movable mold. Since the nozzle for applying the agent is provided, the release agent can be sprayed and applied uniformly in the cavity of the mold. In particular, when the nozzle is positioned at the back or corner of the cavity, the release agent sprayed from the nozzle is sprayed in a good mist up to the back or corner of the cavity, making it very easy to apply the release agent. It is valid. Furthermore, since the mold release agent is sprayed into the cavity during the molding cycle and during the mold opening movement of the slide core during the mold opening, there is no need to provide a special spraying step, thereby improving productivity. It is more preferable.

(Embodiment 1) FIGS. 1 to 5 show an example of an apparatus for carrying out a method of applying a release agent according to the present invention, in which a mold for moving a slide core using an angular pin is used. It is a figure explaining operation | movement in the shaping | molding process.

FIG. 1 shows a cross section of the mold when the mold is closed. As shown, the mold 1 includes a fixed mold 2 and a movable mold 3. The fixed mold 2 includes a fixed mounting plate 4 on which the angular pins 5 are mounted and a fixed mold plate 6 fixed to the fixed mounting plate 4, while the movable mold 3 is a movable mounting plate. 7, spacer block 8, receiving plate 9
, Ejector plate 10 and projecting sleeve 11
, Core pin 12 and cavity 1 for molded article 20
9 are formed. Therefore, the cavity 1 formed by the slide cores 14, 14 guided along the angular pins 5
The molten molding material is injected into the molding 9 to form a molded article 20 having a required shape.

In the thus-configured mold 1, the release agent 18 is sprayed onto the cavity 19 formed by the slide cores 14, 14, so that the nozzles 16, 17 are moved on the movable side. And is formed on the receiving plate 10 at a required angle as shown in FIG.

In such a mold 1, the nozzles 16 and 17 for applying the release agent 18 are closed by the slide cores 14 when the mold is closed. The nozzles 16 and 17 for spraying the mold release agent 18 preferably spray the mold release agent 18 toward the back and corners of the cavity 19 of the mold 1 as clearly shown in FIGS. As described above, one of the molds 1, preferably, the receiving plate 9 of the movable mold 3 is provided.

In the thus configured mold 1, as shown in FIG. 1, the movable mold 3 is closed with respect to the fixed mold 2 for injection molding of a synthetic resin material. The molten resin material is injected into the cavity 19 of the mold 1 from the molding machine, and the molded product 20 is injection molded.

In the state where the mold is closed as shown in FIG. 1, if the molding is completed and the molded article 20 is sufficiently cured, the mold 1 is opened as shown in FIG. That is, at the same time when the movable mold 3 moves in the direction of arrow B with respect to the fixed mold 2, the slide cores 14 move in the direction of arrow A to open the mold 1. In this way, at the same time when the mold opening starts, the release agent 18 is sprayed from the nozzles 16 and 17 onto the cavity 19. In the mold opening stroke in the direction of arrow B in the middle of the mold opening shown in FIG.
Are opened toward the outside of the mold 1 in the direction of arrow A, respectively. As the mold is further opened, the slide cores 14 and 14 are completely opened, and the angular pins 5 are
4 and 14 are completely separated from each other (FIG. 3). During this time, the release agent 18 is continuously sprayed from the nozzles 16 and 17 toward the cavity 19. Therefore,
The release agent 18 is first sprayed toward the cavities 19 near the nozzles 16 and 17, and gradually, the release agent 18 is sufficiently sprayed to the deeper corners of the cavity 19. At the same time, the molded article 20 is pushed out of the core pin 12 by the projecting sleeve 11, and is completely released from the cavity 19 as shown in FIG.

FIG. 3 shows that the angular pin 5 is the slide core 1.
FIG. 9 is a view showing a state in which the molded article 20 is projected after opening the molds that have come out of the slide cores 5 and 15, respectively.
17 is completely open. Therefore, the molded product 20 is
After removal from the nozzle 1, as shown in FIG.
The release agent 18 is continuously sprayed onto the cavities 19 of the slide cores 15, 15 from 6, 17 respectively. At this time, as clearly shown in FIG. 4, particularly in FIG. 5, the releasing agent 18 is sufficiently applied by the nozzles 16 and 17 even at the corners where the releasing agent is hardly applied in the related art. Can be improved. Further, by providing a member having a fine hole such as a porous body at the tip of the nozzles 16 and 17 as necessary, the release agent 18 is suitably sprayed in a mist state, which is more favorable.

According to the release agent applying method of the present invention configured as described above, since the nozzles 16 and 17 for applying the release agent 18 are provided on the movable side of the mold 1, the cavity 19 is provided. The release agent 18 can be uniformly applied to the inside. In particular, the application is effective when the position of the nozzles 16 and 17, that is, the direction is adjusted to the inner side or the corner of the cavity 19. Further, since the release agent 18 is applied to the inside of the cavity 19 in the middle of the molding cycle, the productivity is improved, which is more preferable.

(Embodiment 2) FIG. 6 shows another example of a mold of an apparatus for carrying out the release agent applying method of the present invention, in which a nozzle is provided on an ejector pin formed in a hollow. Other than being provided, it is substantially the same as the previous embodiment.

As shown in FIG. 6, the mold 30 comprises a fixed mold 31 and a movable mold 32.
Is a fixed side mounting plate 34 on which the angular pin 35 is mounted.
And a fixed mold plate 36 fixed to the fixed mounting plate 34. The movable mold 32 includes a movable mounting plate 37,
Spacer block 38, receiving plate 39, ejector plate 40, ejector pin 41, core pin 42
And a slide core 44, 45 forming a cavity 49 for the molded article 50, and is melted in the cavity 49 formed by the slide core 44, 45 guided along the angular pin 35. The molding material is injected to form a molded product 50 having a required shape.

In the thus-configured mold 30,
The release agent 48 is sprayed onto a cavity 49 formed by the slide cores 44 and 45. For this purpose, the nozzles 46 and 47 are respectively provided on the ejector pins 41 and 41 formed in a hollow. Since the mold release agent 48 is sprayed so as to spread well to every corner of the cavity 49, the mold releasability of the molded product 50 can be further improved. In addition, these nozzles 46 and 47 can be formed on the ejector pins 41 and 41 so as to spray the mold release agent 48 at a required angle to the cavity 49 so that the cavity 49 can be sprayed well.

In such a mold 30, the release agent 48
When the mold is closed, the ejector pins 41, 41 are retracted into the receiving plate 40 and are closed by the slide cores 44, 45.
When the mold is opened, the ejector pin 4
1, 41 project and the nozzles 46, 4 as shown
7, the mold release agent 48 is sprayed from the nozzles 46 and 47, and the mold release agent 48 is suitably sprayed toward the back and corners of the cavity 49 of the mold 30.

According to the mold release agent applying method and the mold of the present invention configured as described above, the mold release agent 48 is applied to at least one of the fixed mold 31 to the movable mold 32 of the mold 30. Since the nozzles 46 and 47 are provided, the release agent 48 can be uniformly sprayed and applied in the cavity 49. In particular, when the positions of the nozzles 46 and 47 are aligned with the inner side and the corners of the cavity 49,
Since the release agent 48 sprayed from 47 is sprayed in the form of a good mist to the inner side and the corners of the cavity 49, it is very effective for applying the release agent 48. Further, since the release agent 48 is sprayed into the cavity 49 during the molding cycle, there is no need to provide a special spraying step, and the productivity can be improved, which is more preferable. Further, the number of nozzles can be increased or decreased as required, as required.

[0041]

As described above, in the method for applying a release agent according to the first aspect of the present invention, a nozzle for spraying the release agent is provided on at least the movable mold of the mold for molding the molding material. ,
Since the release agent is sprayed toward the mold by the release agent spray nozzle, the release agent is sprayed well to the far side and the corners of the cavity of the mold, and is preferably applied and spread. Thereby, the releasability is improved and the productivity is also improved.

In the method for applying a release agent according to the second aspect of the present invention, the release agent is sprayed in a mist toward the cavity of the mold by the nozzle, so that the releasability of the molded product is improved. And increase productivity.

Further, in the method for applying a release agent according to a third aspect of the present invention, a nozzle for spraying the release agent is provided on a mold plate molded using a slide core, and the molded product is taken out by opening the mold. Since the release agent is sprayed into the cavity by the nozzle after the above, the release agent is sufficiently applied by the nozzle even at a corner where it is difficult to apply, so that the release agent is uniformly applied to the entire cavity of the mold. And the productivity can be improved by improving the releasability.

Further, in the method for applying a release agent according to a fourth aspect of the present invention, a nozzle for spraying the release agent is provided on a side surface of a tip portion of the ejector pin formed in a hollow, and a molded product is formed from a mold. When the molded product is released by the ejector pin so as to take out the mold, the release agent is sprayed into the cavity from the nozzle of the ejector pin, so that the release agent can be satisfactorily applied over the entire cavity of the mold. It is possible to improve the releasability of the molded product and improve the productivity.

In the method for applying a release agent according to the fifth aspect of the present invention, since a member having fine holes is provided at the tip of the nozzle, the release agent to be sprayed is suitably applied to the mold. The releasability can be further improved, and the productivity is improved.

Further, in the mold according to the sixth aspect of the present invention, a release agent spray nozzle is provided on at least the movable mold of the mold for molding the molding material, and the release agent spray nozzle is used to release the mold release agent. Since the mold is sprayed toward the movable mold and the fixed mold, the releasability of the molded product can be improved.

Further, in the mold according to claim 7 of the present invention, since the release agent is sprayed in a mist state toward the cavity of the mold by the nozzle, the mold releasability can be improved.

Further, in the mold according to the eighth aspect of the present invention, a nozzle for spraying a release agent is provided on a mold plate to be molded using a slide core, and the molded product is taken out by opening the mold. Since the release agent is sprayed into the cavity of the slide core by the nozzle while moving the slide core together with the start of the mold opening movement of the slide core, the releasability of the molded product is improved and the productivity is improved. Can be enhanced.

In the mold according to the ninth aspect of the present invention, a nozzle for spraying a releasing agent is provided on a side surface of a tip portion of the ejector pin formed in a hollow, and the ejector pin is taken out from the mold. When the molded product is released from the mold, the release agent is sprayed into the cavity of the mold by the nozzle while moving the ejector pin, so that the release agent is sprayed into the cavity of the mold during molding. It is not necessary to provide a special spraying step, and the productivity can be improved.

The mold according to claim 10 of the present invention is
Since a member having a fine hole is provided at the tip of the nozzle, the release agent can be sprayed in a mist-like manner to the far side and the corners of the cavity of the mold, and can be applied. And the productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a view showing an example of an apparatus for carrying out a method of applying a release agent according to the present invention, and illustrates an operation in a molding step of a mold in which a slide core is moved using an angular pin when the mold is closed. It is sectional drawing of the metal mold | die of FIG.

FIG. 2 is a cross-sectional view of a mold during the mold opening when the molding is completed and the molded article is sufficiently cured and the mold is opened.

FIG. 3 is a cross-sectional view showing a state in which a molded product is protruded after the angular pin has come out of a slide core and the mold is opened.

FIG. 4 is a cross-sectional view showing a state in which a molded product is protruded and removed after the mold is opened.

FIG. 5 is an enlarged sectional view of a nozzle portion of FIG.

FIG. 6 is a cross-sectional view of a mold according to a modified example for carrying out the method of spraying a release agent of the present invention, showing a state in which the release agent is sprayed from a nozzle after the mold is opened.

FIG. 7 is a view showing another example of an apparatus for carrying out the release agent applying method of the present invention, and is a longitudinal sectional view showing a state at the time of a mold clamping step in the extrusion injection molding machine.

8 is a cross-sectional view showing a state during an injection step in the extrusion injection molding machine of FIG.

FIG. 9 is a sectional view showing a state during a pressure holding step in the extrusion injection molding machine.

FIG. 10 is a sectional view showing a state during a cooling step in the extrusion injection molding machine.

FIG. 11 is a cross-sectional view showing a state in which the mold is opened and a molded product is taken out after completion of molding in the extrusion injection molding machine.

[Explanation of symbols]

 Reference Signs List 1 mold 2 fixed mold 3 movable mold 4 fixed mounting plate 5 angular pin 6 fixed mold plate 7 movable mounting plate 8 spacer block 9 receiving plate 10 ejector block 11 projecting sleeve 12 pin 14 slide core 15 Slide core 16 Nozzle 17 Nozzle 18 Release agent 19 Cavity 20 Molded product 30 Mold 31 Fixed mold 32 Movable mold 34 Fixed mount plate 35 Angular pin 36 Fixed mold plate 37 Movable mount plate 38 Spacer block 39 Receiving plate 40 Ejector block 41 Ejector pin 42 Core pin 44 Slide core 45 Slide core 46 Nozzle 47 Nozzle 48 Release agent 49 Cavity 50 Molded article 60 Mold 61 Fixed mold 62 Movable mold 63 Extrusion injection molding machine 64 Heating cylinder 65 Screw 66 heater 7 hopper 68 hydraulic cylinder 69 hydraulic motor 70 moldings

Continuation of the front page (72) Inventor Keizo Naganuma 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (10)

[Claims] 1. A mold release agent spray nozzle is provided at least on a movable mold of a mold for molding a molding material, and the mold release agent is sprayed toward the mold by the mold release agent spray nozzle. Characteristic release agent application method. 2. The method for applying a release agent according to claim 1, wherein the release agent is sprayed in a mist toward the cavity of the mold by the nozzle. 3. A nozzle for spraying a release agent on a mold plate molded using a slide core is provided. When a mold is opened and a molded product is taken out, the slide core is opened together with the start of the mold opening movement. The release agent application method according to claim 1, wherein the release agent is sprayed into the cavity of the slide core by the nozzle while moving the slide core. 4. A nozzle for spraying a release agent is provided on a tip side surface of a hollow ejector pin, and when the molded product is released by the ejector pin so as to take out the molded product from a mold, 3. The method for applying a release agent according to claim 1, wherein the release agent is sprayed into the cavity of the mold by the nozzle while moving an ejector pin. 5. The method for applying a release agent according to claim 1, wherein a member having fine holes is provided at a tip of said nozzle. 6. A mold releasing agent spray nozzle is provided on at least a movable side mold of a mold for molding a molding material, and the mold releasing agent spray nozzle releases the mold release agent onto the movable side mold and the fixed side. A spray that is sprayed toward the mold. 7. The mold according to claim 6, wherein the nozzle sprays a mold release agent toward the cavity of the mold by the nozzle. 8. A nozzle for spraying a mold release agent on a mold plate to be molded using a slide core is provided. When a mold is opened and a molded product is taken out, the slide core starts moving to open the mold, and The mold according to claim 6 or 7, wherein a release agent is sprayed into the cavity of the slide core by the nozzle while moving the slide core. 9. A nozzle for spraying a release agent is provided on a side surface of a tip portion of an ejector pin formed in a hollow, and when the molded product is released by the ejector pin so as to take out the molded product from a mold, The mold according to any one of claims 6 to 8, wherein a release agent is sprayed into the cavity of the mold by the nozzle while moving the ejector pin. 10. The mold according to claim 6, wherein a member having a fine hole is provided at a tip of the nozzle.