JP2005066834A - Insert composite molding method and vertical injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable the insert molding of a three-dimensional film or the like and the composite molding of a molded product using a single cavity mold in both of insert molding and composite molding. <P>SOLUTION: The cavity mold 6 of a composite molded product, a first core mold 20 for insert molding for opening and closing the cavity mold 6 and a second core mold 30 for composite molding are used. The insert molding of a part of the composite molded product is performed by the first core mold 20 and the second core mold 30 to leave a primary molded product in the cavity mold 6. The composite molding of the other part of the composite molded product and the primary molded product is performed by the cavity mold 6 and the second core mold 30. The composite molded product is released from the cavity mold 6 along with the second core mold 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insert composite molding method for a product in which an outer surface is formed by a surface layer such as a film or a sheet, and the whole is compositely formed of different color or different resin, and a vertical injection molding machine used for the molding. .
[0002]
[Prior art]
When insert-molding a painting film etc. by conventional two-color molding, the first female mold that performs insert molding and the second female mold that performs two-color molding are shared, and insert molding is performed by the first female mold. The primary molded product thus held is transferred to the second female mold while being held in the male mold, and the male mold is closed with the second female mold together with the primary molded product to perform two-color molding (for example, see Patent Document 1). .
In addition, as a multicolor molding machine, a core mold is mounted as a movable mold on a movable plate connected to a mold clamping ram, and a pair of cavity molds are connected to the core mold as a first fixed mold and a second fixed mold. As a mold, it is placed side by side on a horizontally movable injection stand on a fixed platen, and the first and second fixed molds by the core mold are alternately opened and closed with the movable mold of the cavity mold, and primary molding is performed. The product is released from the first fixed mold and held by a movable mold, and the primary molded product is configured so that multicolor molding can be performed by closing the mold with the second fixed mold together with the movable mold (for example, patents) Reference 2).
[0003]
[Patent Document 1]
JP-A-6-106572 (page 3, FIG. 5-7).
[Patent Document 2]
JP-A-7-144356 (page 3-4, FIG. 1, FIG. 5-6).
[0004]
[Problems to be solved by the invention]
In order to cover the surface of a molded product with a film or to apply a painting, insert a film or a printed film into a cavity, and in that state, insert molding is performed by injection filling resin into the cavity. When forming with different color or different resin, use the first and second female molds that share a single male mold as described in Patent Document 1 above, and insert the female mold by replacing the female molds. Since molding and composite molding are performed, it is necessary to remove the insert-molded primary molded product from the first female mold and refit it into the second female mold, which causes scratches on the insert surface of the molded product. Or may be defectively formed due to adhesion of dust or the like.
[0005]
In addition, the female mold can be replaced by adopting the slide moving means implemented in the composite molding, but since the injection injection of the resin is performed from the male mold side, the resin path for the insert molding and the composite molding is the male mold. In addition, the structure on the male side becomes complicated because it is necessary to provide a protruding device for releasing on the male side.
[0006]
As with the multicolor molding machine described in the above cited reference 2, it is possible to inject and fill the resin from the cavity mold side that slides. However, in insert molding, since the insert is in contact with the cavity surface, insert molding is performed. It is extremely difficult to perform composite molding of the molded product by injection filling from the cavity mold side later.
[0007]
The present invention has been conceived in order to solve the above-described conventional problems. The object of the present invention is to use a single cavity mold for both insert molding and composite molding, thereby enabling insertion molding of a three-dimensional film or the like. Providing a new insert composite molding method that can easily perform composite molding of molded products and prevent scratches and dust from adhering during the transition from insert molding to composite molding, and a vertical molding machine for insert composite molding There is to do.
[0008]
[Means for Solving the Problems]
The molding method of the present invention according to the above object uses a cavity mold of a composite molded article, a first core mold for insert molding that opens and closes the cavity mold, and a second core mold for composite molding. The first core mold and the cavity mold are used to insert-mold a part of the composite molded product to leave the primary molded product in the cavity mold, and the cavity mold and the second core mold are used for the composite molding. The composite molding of the other part of the product and the primary molded product is performed, and the composite molded product is released from the cavity mold together with the second core mold.
[0009]
Further, the molding method of the present invention includes a step of inserting a surface layer material of a composite molded product such as a film or a sheet into the cavity mold of the composite molded product along the cavity surface, and the cavity mold and the first core mold. And partially forming a primary cavity between the core mold and the surface layer material, and then injecting and filling resin from the core mold into the primary cavity to primarily form a part of the composite molded product on the surface layer material. And a step of releasing the primary formed product together with the surface material from the first core mold by leaving the mold and leaving it in the cavity, and replacing the first core mold with the second core mold after the mold is opened; The mold is closed with the cavity mold, a secondary cavity is formed between the core mold and the surface layer material and the primary formed product, and the secondary cavity is injected and filled with different color or different resin from the core mold, The resin, surface layer material, and primary product are integrated. Forming the composite molded product, holding the composite molded product by the core mold, releasing the mold from the cavity mold together with the second core mold by opening the mold, and then removing the second core mold from the first core It consists of a step of replacing the mold and a step of releasing the composite molded product from the second core mold.
[0010]
Furthermore, the mold opening / closing of the cavity mold, the first core mold, and the second core mold is such that the first core mold, the second core mold, and the cavity mold mounted on the movable platen side are movable. Are arranged side by side so as to be freely movable on the stationary platen side, and are alternately performed by lateral movement of the first core mold and second core mold and forward and backward movement of the cavity mold. It consists of a transparent film or sheet that is three-dimensionally formed in advance according to the surface shape of the composite molded product by vacuum forming or pressing.
[0011]
The vertical injection molding machine for insert composite molding according to the present invention includes a fixed platen supported horizontally by a tie bar and provided horizontally above the machine base, and placed upward in the center of the machine base so that the mold clamping ram is placed on the machine base. A mold clamping device that protrudes and has a movable plate connected to the mold clamping ram, a first injection device that is placed downward on the center of the fixed plate and faces the mold clamping device, and a machine base on which the movable plate is located is fixed. The space between the panels is the molding work part, the second injection device installed behind the upper part, the left and right space of the molding work part is the mold standby part, and the length spans one mold standby part and the molding work part, It consists of a base plate attached to the bottom of the fixed plate so that it can move laterally.
A cavity mold of the composite molded product is mounted on the movable platen so that the surface layer material of the molded product can be inserted into the cavity when the mold is opened, and the mold is opened and closed alternately with the cavity mold. A first core mold and a second core mold for sequentially molding all parts and other parts are arranged in parallel downward on the base plate, and a mold standby part of the second core mold is released from the composite molded product. As the working unit, a protruding device is provided on the fixed platen. Further, the mold standby part of the first core mold is used as a sprue release working part, and a protruding device for opening the mold is provided on the stationary platen.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show an embodiment of vertical injection molding capable of insert composite molding, where 1 is a machine base, 2 is supported by a required number of tie bars 3 and 3 and is placed horizontally above the machine base. The provided fixed platen 4 is a hydraulically operated mold clamping device installed upward in the center of the machine base 1, and the movable platen 6 is inserted into and supported by the tie bars 3 and 3 on the mold clamping ram 5 protruding on the machine base. Are connected.
[0013]
Reference numeral 7 denotes a first injection device, which is installed downward on the center of the stationary platen 1 so as to face the mold clamping device 4. Reference numeral 8 denotes a second injection device, and a portion between the machine base 1 and the fixed platen 2 on which the movable platen 6 is located is a molding work part, and is adjusted to the height of a second core mold 30 to be described later behind the upper part. Although omitted, it is installed on the machine base.
[0014]
The left and right spaces of the molding work part can be used as a mold standby part, and a base plate 9 having a length extending between the mold standby part and the molding work part is provided in a pair of longitudinal directions disposed on the lower surface of the fixed platen 2. The guide rails 10 and 10 are movably fitted and attached to the lower surface of the fixed plate so as to be movable in the lateral direction. Reference numeral 11 denotes a hydraulically actuated base plate driving device (see FIG. 2), which is provided in parallel with the guide rail 10 by fixing the cylinder to the stationary platen side and the piston rod to the base plate side. Reference numerals 12 and 13 denote mold release projection devices provided on the fixed plates of both mold standby parts.
[0015]
Reference numeral 14 denotes a cavity mold having a cavity 15 for molding the outer shape of the composite molded product D (see FIG. 12), and the surface layer material of the composite molded product D can be easily inserted into the cavity when the mold is opened. Installed upward. 20 is a first core mold for molding a part of the composite molded product D, 30 is a second core mold for molding all other composite molded products D to composite the composite molded product D, both of which are The lower surface of the base plate 9 is arranged in parallel downwardly at a predetermined interval so that the mold can be alternately opened and closed with the cavity mold 14 in the molding operation section.
[0016]
FIG. 4 shows an example of the cavity mold 14 and the first and second core molds 20 and 30.
The first core mold 20 integrally has a core mold 21 that closes the cavity mold 15 on the parting surface of the mold block 20a. The mold block 20a has a normal structure in which a support pin and a spring around the mold block 20 are movably pressed and supported on the base mold 20b.
[0017]
The core mold 21 has a recess 22 that forms a primary cavity around the bottom surface of the cavity and the periphery of the protrusion on the bottom surface by closing the cavity 15 with the cavity 15. It communicates through the gate. In the recess 22, a projecting pin 24 is inserted and inserted into a projecting plate 25 that is always pressed in the projecting direction by a spring, and the operating pin 26 is mounted on both sides of the projecting plate 25 and projects to the parting surface. When the mold is opened and closed, the projecting pin 24 also enters and exits the recess 22 to release the primary molded product from the core mold 21 and leave it in the cavity.
[0018]
The second core mold 30 has a recess 32 corresponding to the protrusion on the bottom surface of the cavity on the front end surface of the core mold 31, and the front end surface excluding the recess 32 and the core mold peripheral surface are omitted in the drawing. A cavity for molding all other parts of the composite molded product D is formed by closing the mold with the cavity 15, and the resin can be injected from the hot runner 33 provided in the cavity from the back to the center. A protruding pin 34 is attached to and inserted into a core plate 31 to a protruding plate 35 that is always elastically pressed in the backward direction by a spring, and the protruding plate 35 is pressed by the protruding rod 12a of the protruding device 12 to protrude the protruding pin. The composite molded product D held on the core mold 31 can be released by protruding 34.
[0019]
When the first and second core molds 20 and 30 are moved back and forth alternately by the lateral movement of the base plate 9, each mold standby part and molding work part are reciprocated and stopped at the molding work part. The mold is closed with the cavity mold 14 on the movable plate that moves forward (ascends) by the operation of the mold clamping device 4, and the first core mold 20 is injected with resin from the first injection device 7, and the second core. Resin is injected into the mold 30 from the second injection device 8, and both insert molding and composite molding are continuously performed by the same molding machine.
[0020]
In the mold standby part of the first core mold 20, as shown in FIG. 3, the mold block 20a pressed against the base mold 20b by the spring around the support pin is pushed by the projecting rod 13a of the projecting device 13. It opens and leaves | separates from the base mold | type 20b, and the mold release and taking-out of a sprue are performed in the meantime. Therefore, when one core mold is in the injection molding operation, the mold release operation is performed in the other core mold.
[0021]
In this way, the cavity mold 14 is mounted upward on the movable plate 6 so that it can be inserted into the cavity when the mold is opened, and the first core mold 20 and the second core mold 30 are attached to the cavity mold 14. In the vertical type injection molding machine that is arranged in parallel downward on the base plate 9 that can be moved laterally on the lower surface of the fixed platen 2, the insert can be performed more easily and reliably than in the case of the lateral cavity.
[0022]
In addition, by simply inserting a film or sheet into the cavity, no other special holding means is required, so the structure of the cavity mold is simplified, and it is easy to leave it in the cavity with a protruding pin. Insert molding and composite molding can be efficiently performed without causing any trouble in composite molding by adhering to the surface. Furthermore, two injection devices can be installed on the upper part and the back part of the molding work part, and the mold can be released at the mold standby positions on both sides of the molding work part, so that the molding machine can be made compact.
[0023]
Next, the insert composite molding of the present invention will be described in the order of steps with reference to FIGS.
In FIG. 5, in the mold open state where the first core mold 20 is located above the cavity mold 20, the surface layer material A of the composite molded product D in which a transparent film is formed in conformity with the cavity shape is inserted into the cavity 15. To do. This insert can be performed using a commonly used insert device.
[0024]
6, the cavity mold 20 is moved upward relative to the first core mold 20, and the cavity 15 and the core mold 21 are closed. When the mold is closed, the operation pin 26 protruding from the parting surface comes into contact with the parting surface of the cavity mold 14 and retracts to the block surface. As a result, the projecting pin 24 is also retracted by the block surface in the recess 22 to form the primary cavity 16 around the bottom surface of the cavity and the periphery of the protrusion on the bottom surface. After the mold closing and clamping, the first resin B (see FIG. 7) is injected and filled into the primary cavity 16 from the sprue 23, although not shown in the figure.
[0025]
7, a part of the composite molded product D is partially formed and integrated with the surface layer material A by the first resin B, and then the cavity mold 14 is lowered to open the mold. Although the parting surfaces are separated from each other by this mold closing, the operation pin 26 that has been in contact with the parting surface of the cavity mold 14 is maintained in its state by the spring pressure and protrudes from the block surface. Accordingly, the protruding pin 24 also protrudes from the block surface in the recess 22, and the surface layer material A in the cavity and the primary formed product of the first resin B are pressed against the bottom surface of the cavity by the protruding pin 24. The mold is released from the core mold 21 and left in the cavity 15.
[0026]
8. After the mold is opened, the base plate 9 is moved laterally to replace the first core mold 20 and the second core mold 30. By this lateral movement, the first core mold 20 is moved to the mold standby part, the second core mold 30 is moved to the molding work part, and the surface layer material A and the first formed product by the first resin B remain in the cavity. It faces the cavity mold 14.
[0027]
9, the cavity mold 14 is moved upward after the moving operation, and the cavity 15 and the core mold 31 are closed. By this mold closing, the secondary cavity 17 is formed between the core mold 31 and the primary formed product of the surface layer material A and the first resin B. After mold closing and mold clamping, the second cavity 17 is injected and filled with an opaque second resin C different from the first resin B from the hot runner 33, and the primary by the resin C, the surface layer material A and the first resin B A composite molded product D in which the formed product is integrally combined is formed (see FIG. 10).
[0028]
10, after the molding is completed, the cavity mold 14 is lowered to open the mold. The composite molded product D molded by injection filling of the second resin C is in a state where the second resin C is embraced by the core mold 31 due to the shrinkage due to cooling, so that the cavity 15 is lowered from the cavity 15 as the cavity mold 14 is lowered. It comes out and is released with the core mold 31.
[0029]
11, after the mold is opened, the second core mold 30 and the first core mold 20 are exchanged by moving laterally based on the base plate 9. By this lateral movement, the second core mold 30 moves to the mold standby part, and the composite molded product D hugged to the core mold 31 is separated from the core mold 31 by the operation of the protruding pin 34 after stopping. Type.
[0030]
In this way, the inserted surface layer material and the primary forming part are left in the cavity, and when the composite molded product is completed by replacing the core mold, the primary molding side when holding and transferring to the core mold for composite molding Since it is in a stationary state until the composite molding is completed, the adhesion of dust to the surface of the surface layer material and the generation of scratches that are likely to occur as a result of the removal and insertion are prevented.
[0031]
Further, since both insert molding and composite molding are performed with one cavity, cavity design becomes easier than when molding with two cavities. Furthermore, by leaving it in the cavity, it becomes easy to insert-mold the surface layer material with a three-dimensional film, and even if the surface layer material and the primary forming portion are only attached to each other, composite molding with the second core mold can be performed. Therefore, there is no need to select a material in consideration of the familiarity between the inserted surface layer material and the resin, and there is an advantage that molding is not limited to a specific material.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional front view of an insert composite molding vertical injection molding machine according to the present invention at the time of insert molding.
FIG. 2 is a plan view of the above.
FIG. 3 is a schematic front view at the time of composite molding.
FIG. 4 is a schematic longitudinal sectional view of a three mold.
FIG. 5 is a longitudinal sectional front view of a main part of a cavity mold and a first core mold during insertion.
FIG. 6 is a longitudinal sectional front view of the main part of the cavity mold and the first core mold when the mold is closed.
FIG. 7 is a longitudinal sectional front view of the main part of the cavity mold and the first core mold when the mold is opened.
FIG. 8 is a longitudinal sectional front view of the main part of the cavity mold and the second core mold after the core mold replacement.
FIG. 9 is a longitudinal sectional front view of a main part of a cavity mold and a second core mold when the mold is closed.
FIG. 10 is a longitudinal sectional front view of a main part of a cavity mold and a second core mold when the mold is opened.
FIG. 11 is a longitudinal sectional front view of a main part of a composite molded product and a second core mold during mold release.
FIG. 12 is a perspective view of a composite molded product.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Machine stand 2 Fixed platen 3 Tie bar 4 Clamping device 6 Movable platen 7 First injection device 8 Second injection device 9 Base plate 12, 13 Protrusion device 14 Cavity mold 15 Cavity 16 Primary cavity 17 Secondary cavity 20 First core Mold 21 Core mold 22 Recess 30 Second core mold 31 Core mold 32 Recess

Claims (6)

Using a cavity mold for a composite molded article, a first core mold for insert molding that opens and closes the cavity mold, and a second core mold for composite molding, the first core mold and the cavity mold By performing insert molding of a part of the composite molded product and leaving the primary molded product in the cavity mold, the cavity mold and the second core mold can be used for the other part of the composite molded product and the primary molded product. The composite molding is performed, and the composite molded product is released from the cavity mold together with the second core mold. Inserting the surface layer material of the composite molded product such as a film or sheet into the cavity mold of the composite molded product along the cavity surface;
The cavity mold and the first core mold are closed, a primary cavity is partially formed between the core mold and the surface layer material, and resin is injected and filled into the primary cavity from the core mold. A step of primary forming a part of the surface material;
The step of opening the primary formed product together with the surface layer material from the first core mold and leaving it in the cavity by opening the mold, and replacing the first core mold with the second core mold after opening the mold;
The second core mold is closed with the cavity mold to form a secondary cavity between the core mold, the surface layer material, and the primary formed product, and a different color or different resin is injected into the secondary cavity from the core mold. Filling and molding a composite molded product in which the resin, the surface layer material and the primary product are integrated;
A step of holding the composite molded product by the core mold, releasing the mold from the cavity mold together with the second core mold by opening the mold, and replacing the second core mold with the first core mold; An insert composite molding method comprising a step of releasing a composite molded product from a mold. The cavity mold, the first core mold, and the second core mold are opened and closed by fixing the first core mold and the second core mold to the cavity mold that can be moved forward and backward. The insert composite according to claim 2, wherein the insert composite is arranged side by side on the board side so as to be freely movable, and is alternately performed by lateral movement of the first core mold and second core mold and forward and backward movement of the cavity mold. Molding method. 3. The insert composite molding method according to claim 2, wherein the surface layer material is made of a transparent film or sheet that is three-dimensionally formed in advance according to the outer shape of the composite molded product by vacuum forming or pressing. A stationary platen supported horizontally by a tie bar and provided above the machine base;
A mold clamping device that is installed upward in the center of the machine base and projects a mold clamping ram on the machine base, and a movable plate is connected to the mold clamping ram;
A first injection device installed downward on the center of the fixed plate and facing the clamping device;
Between the machine base on which the movable platen is positioned and the fixed platen, a molding work part is used, and a second injection device installed behind the upper part,
The left and right space of the molding work part is a mold standby part.
A cavity mold of the composite molded product is mounted on the movable platen so that the surface layer material of the molded product can be inserted into the cavity when the mold is opened, and the mold is opened and closed alternately with the cavity mold. A first core mold and a second core mold for sequentially molding all parts and other parts are arranged in parallel downward on the base plate, and a mold standby part of the second core mold is released from the composite molded product. A vertical injection molding machine for insert composite molding, characterized in that a protruding device is provided on a fixed platen as a working part. 5. The insert composite molding rod according to claim 4, wherein a mold standby part of the first core mold is used as a sprue release working part, and a protruding device for releasing the mold is provided on the stationary platen. Mold injection molding machine.

Images