JPH05309701A - Injection molding apparatus for transfer molding - Google Patents

Abstract

PURPOSE:To provide an injection molding apparatus for transfer molding capable of effecting positional fixation readily correctly without causing positional dislocation of a transfer film even in the case of forming transfer parts on the outside of a box-shaped molding. CONSTITUTION:The apparatus includes a cavity mold 20, a core mold 30 and a transfer film setting device 40, and the transfer film setting device 40 advances in a manner positioning and holding a transfer film on its front surface through penetration of engaging pins 45 and vacuum suction, and then acts to bring the transfer film into close contact with the cavity surface 21a and, after vacuum suction the transfer film onto the cavity surface 21a and cavity outer periphery by taking the place of such vacuum suction, it withdraws and moves out therefrom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding apparatus for transfer molding.

[0002]

2. Description of the Related Art For example, so-called transfer molding, in which a transfer film in which a transfer portion such as a decorative print or a circuit pattern is formed on a carrier film is arranged in a cavity and the transfer portion is formed simultaneously and integrally with injection molding of a molded product, is known. Has been done.

As a method for setting the positioning of the transfer film in such transfer molding, a vertical positioning mark and a horizontal positioning mark are formed on the surface of the transfer film having the transfer portion formed on the carrier film, and a mold is formed. A sensor provided at a predetermined position above detects the positioning mark in each direction, and the signal is used to position the transfer portion. Then, by means such as vacuum suction,
The transfer film is fixed to a predetermined cavity surface.

However, in recent years, the shape of the molded product is required to have a three-dimensional shape such as a box shape or a crank shape from a simple plate shape. For example, when the transfer portion is formed on the outer portion of the box shape. In addition, the deeper the depth of the transferred box is, the more difficult it is to position the film on the cavity surface, and sometimes the position of the film is displaced during mold clamping.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve such problems, and the position of the transfer film can be maintained even when the transfer portion is formed outside the box-shaped molded product. An object of the present invention is to provide an injection molding apparatus for transfer molding, which can be positioned and fixed easily and accurately without causing displacement.

[0006]

That is, the present invention is
In the injection molding apparatus for transfer molding, in which the transfer film supplied at a predetermined position between the cavity mold and the core mold is positioned and set on the cavity surface and integrally injection-molded, the transfer film vacuum suction unit is provided on the cavity surface and the outer peripheral edge of the cavity. A cavity mold having a transfer film positioning hole in the cavity surface, and a positioning pin penetrating the positioning hole formed in the transfer film and fitted into the positioning hole of the cavity surface, A core die that defines the shape of the molded product in a pair, a locking pin that penetrates the positioning hole of the transfer film and fits into the positioning hole of the cavity surface, and a transfer film vacuum suction portion are provided on the surface, The transfer film setting device is arranged so as to move forward and backward between the cavity mold and the core mold and retractable outside the mold, The transfer film setting device moves forward while positioning and holding the transfer film on the surface by penetrating the locking pin and vacuum suction, sets the transfer film in pressure contact with the cavity surface, and replaces the vacuum suction with the cavity surface and the cavity. The present invention relates to an injection molding apparatus for transfer molding, characterized in that after the transfer film is vacuum-adsorbed to the outer peripheral edge, the transfer film is retracted and retracted outside the mold.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. 1 is a schematic sectional view showing an example of an injection molding apparatus for transfer molding of the present invention, FIG. 2 is a schematic sectional view of a molding apparatus showing a state in which a transfer film setting device is advanced to a cavity surface, and FIG. 3 is a transfer film cavity. FIG. 4 is a schematic sectional view of the molding apparatus showing a state in which the surface is pressed and set, FIG. 4 is a schematic sectional view of the molding apparatus showing a state in which the transfer film setting apparatus is retracted from the mold, and FIG. FIG. 6 is a schematic cross-sectional view of the forming apparatus shown in FIG. 6, FIG. 6 is a view taken in the direction of arrow 6 in FIG. 1 showing an example of a positioning and holding groove, and FIG. 7 is a plan view showing an example of a transfer film.

As shown in FIG. 1, the transfer molding injection molding apparatus 10 of the present invention includes a cavity mold 20 and a core mold 30.
And a transfer film setting device 40 provided so as to be able to move forward and backward between the cavity mold 20 and the core mold 30, and a transfer film 60 supplied from a transfer film supply device 50 is provided on the mold surface of the cavity mold 20. It is positioned and set in a position and is integrally injection-molded.

The cavity mold 20 has a cavity 21 that defines the shape of the molded product, and is fixed to a movable platen 22 that moves forward and backward with respect to the core mold 30. The cavity 21 is provided with a transfer film vacuum suction portion 24 on the cavity surface 21 a and the cavity outer peripheral edge 23.

The transfer film vacuum suction unit 24 is connected to a vacuum suction device (not shown) provided outside the machine, and a transfer film set device 40, which will be described later, transfers the transfer film disposed on the mold surface of the cavity mold 20. The film 60 is fixed to the cavity surface 21a and the outer peripheral edge 23 of the cavity by suction. Reference numeral 27 is a vacuum suction tube. A plurality of the transfer film vacuum suction portions 24 are provided at appropriate positions according to the cavity type and the size of the film to be arranged.

Transfer film positioning holes 25, 25 are provided in the cavity surface 21a. The transfer film positioning holes 25, 25 are adapted to fit with the positioning pins 35, 35 of the core die 30 and the locking pins 45, 45 of the transfer film setting device 40 described later.

On the other hand, the core mold 30 is the cavity mold 20.
Has a core 31 which is paired with the cavity 21 to define the shape of the molded product, and the core 31 has a positioning pin 35 corresponding to the transfer film positioning holes 25 formed in the cavity surface 21. , 35 are projected. Reference numeral 32 is a sprue hole.

The transfer film setting device 40 has a core portion 41 corresponding to the shape of the cavity 21 on the side of the cavity die 20, is attached to the movable platen 22 of the cavity die 20 via a cylinder device S, and It is arranged so as to move forward and backward between the cavity mold 20 and the core mold 30 at the time of setting, and retractable outside the mold at the time of molding a molded product. The cylinder device S used here is preferably a servomotor or a known air cylinder device.

The core portion 41 is provided with a transfer film vacuum suction portion 44 for sucking the transfer film 60 on its transfer film holding surface 41a, and through a positioning hole 65 formed in the transfer film 60. Transfer film positioning holes 25, 2 on the cavity surface 21a
It is provided with locking pins 45, 45 which are fitted with 5. The tip of the locking pin 45 is preferably formed in a taper shape in order to facilitate fitting with the transfer film 60 and the positioning holes 65 and 25 of the cavity surface 21a.

Further, as shown in FIG. 6, the transfer film holding surface 41a is provided with a groove portion 42 for lateral positioning of the transfer film, and the transfer film 60 sent out by the transfer film supply device 50 is The transfer film holding surface 41a is properly guided and arranged at a predetermined position.

Here, a transfer film supply device 50 for delivering the transfer film 60 and the transfer film 60.
Will be described. The transfer film supply device 50 is attached to the movable platen 22 of the cavity mold 20 and is used to send out the transfer film 60 in which a transfer portion such as a decorative print or a circuit pattern is formed on a carrier film for each molding. A positioning sensor 53 for positioning the film 60 in the feeding direction is provided. Reference numeral 52 is a feed reel, 54 is a take-up reel, and 55 is a guide roller. A known optical sensor or the like is preferably used as the positioning sensor 53.

As shown in FIG. 7, the transfer film 60 has a carrier film 61 on which a transfer portion 62 for decorative printing, a circuit pattern, etc. is formed, and is detected by a positioning sensor 53 of the transfer film supply device. Positioning marks 63 for positioning the film are provided. The transfer film 60 has a positioning hole 6 through which locking pins 45 projecting from the core portion 41 of the transfer film setting device 40 penetrate.
5, 65 are formed. In this embodiment, the positioning holes 65, 65 are provided on the transfer film 60 on the substantially diagonal outside of the transfer portion 62.

The transfer film vacuum suction portion 44 is connected to a vacuum suction device (not shown) provided outside the machine, like the transfer film vacuum suction portion 24 provided in the cavity mold 20. The transfer film 60 supplied from the transfer film supply device 50 is sucked and held on the transfer film holding surface 41a when the transfer film 60 is set. Reference numeral 46 is a vacuum suction tube.

The locking pins 45, 45 are used for the cavity mold 20.
Of the transfer film 60 placed in the chamber 49 and penetrates into the positioning hole 65 of the transfer film 60 and is fitted into the positioning holes 25, 25 for transfer film provided in the cavity surface 21a of the transfer film 60. The transfer film holding surface 41a is formed so as to be able to move in and out by a pressure such as air. Reference numeral 47 is a return spring of the locking pin 45, and 48 is a flow path of compressed air.

At the time of molding, the transfer film setting device 40 is lowered to a predetermined position between the cavity mold 20 and the core mold 30. At this time, the chamber 4 of the core portion 41
9 has stopped the introduction of compressed air, and the locking pin 4
5 is retracted into the core portion 41.

First, as shown in FIG. 1, the transfer film 60 is held by the positioning sensor 53 of the transfer film supply device 50 and the groove 42 of the transfer film setting device 40.
The transfer film setting device 40 is positioned on the holding surface 41 by the compressed air.
Positioning hole 6 of the transfer film 60 protruding from a
Tie with 5. Further, the transfer film vacuum suction unit 44 of the transfer film setting device 40 is operated to securely suck and hold the transfer film 60 on the holding surface 41a.

Next, as shown in FIG. 2, the transfer film setting device 40 is advanced toward the cavity mold 20,
The core portion 41 is inserted into the cavity 21. At that time, the locking pin 45 of the transfer film setting device 40 is attached to the transfer film positioning hole 2 provided in the cavity mold 20.
5, the core portion 41 is positioned on the cavity surface 21.

Here, as better understood from FIG. 3, the suction of the transfer film vacuum suction portion 44 of the transfer film setting device 40 is stopped, and the suction of the vacuum suction portion 24 of the cavity mold 20 is activated. As a result, the transfer film 60 becomes the holding surface 41a of the transfer film setting device 40.
To the cavity surface 21a and the cavity outer peripheral surface 23, and is pressed and set.

Then, as shown in FIG. 4, after the transfer film setting device 40 is retracted out of the mold, the cavity mold 20 and the core mold 30 are clamped, and the cavity 2
Molten resin P is introduced into 1 to mold a molded product. At that time, the positioning hole 25 of the cavity mold 20 used for positioning the film 60 is fitted with the positioning pin 35 of the core mold 30.

After molding, the molded product M is opened with the core mold 30 left, and the transfer film is peeled off from the molded product M to transfer the transfer portion 62, and the transfer film setting device 40 is used again for the cavity mold. It descends between 20 and the core mold 30. In this embodiment, as shown in FIG. 5, in the transfer film setting device 40, a clamping portion 43 for taking out a molded product, which is configured to be openable and closable on the core mold 30 side.
Is provided, the transfer film setting device 40 is further advanced in the direction of the core die 30, and the molded product M ejected by a known protrusion pin or the like (not shown) provided in the core die 20 is sandwiched and taken out, Carry out of the mold

[0026]

As shown and described above, according to the injection molding apparatus for transfer molding of the present invention, the transfer film can be easily and accurately positioned and set even in the case of a box-shaped molded product having a depth. Therefore, the workability is good, and the precision of the obtained molded product is also good.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example of an injection molding apparatus for transfer molding of the present invention.

FIG. 2 is a schematic cross-sectional view of a molding device showing a state where the transfer film setting device has advanced to the cavity surface.

FIG. 3 is a schematic cross-sectional view of a molding apparatus showing a state in which a transfer film is set in pressure contact with a cavity surface.

FIG. 4 is a schematic cross-sectional view of a molding device showing a state where the transfer film setting device is retracted from the mold.

FIG. 5 is a schematic cross-sectional view of a molding apparatus showing a state where a molded product is taken out from a core mold.

FIG. 6 is a view taken in the direction of arrow 6 in FIG. 1, showing an example of a positioning / holding groove.

FIG. 7 is a plan view showing an example of a transfer film.

[Explanation of symbols]

 10 Transfer Molding Injection Molding Machine 20 Cavity Mold 21 Cavity 23 Cavity Outer Perimeter 24 Transfer Film Vacuum Adsorption Part 25 Transfer Film Positioning Hole 30 Core Type 35 Positioning Pin 40 Transfer Film Setting Device 44 Transfer Film Vacuum Adsorption Part 45 Locking Pin 60 transfer film

Claims (4)

[Claims] 1. An injection molding apparatus for transfer molding, wherein a transfer film supplied to a predetermined position between a cavity mold and a core mold is positioned and set on a cavity surface and integrally injection-molded. And a cavity mold which is provided on the outer periphery of the cavity and has a positioning hole for the transfer film on the cavity surface, and a positioning pin which penetrates the positioning hole formed in the transfer film and fits into the positioning hole of the cavity surface. ,
A core mold that is paired with the cavity mold to define the shape of the molded product, a locking pin that penetrates the positioning hole of the transfer film and fits into the positioning hole of the cavity surface, and a vacuum suction portion for the transfer film on the surface. And a transfer film setting device disposed between the cavity mold and the core mold so as to be able to move forward and backward and retract outside the mold, wherein the transfer film setting device is configured to penetrate the locking pin and vacuum suction the transfer film. While positioning and holding the transfer film on the surface, the transfer film is pressed and set on the cavity surface, and instead of the vacuum suction, the transfer film is vacuum-sucked on the cavity surface and the outer peripheral edge of the cavity, and then retracted and retracted from the mold An injection molding apparatus for transfer molding. 2. The injection molding apparatus for transfer molding according to claim 1, wherein the locking pin of the transfer film setting device is configured to be movable forward and backward. 3. The injection molding apparatus for transfer molding according to claim 1, wherein the transfer film holding surface of the transfer film setting device has a groove for positioning and holding the transfer film. 4. The method according to any one of claims 1 to 3,
An injection molding device for transfer molding, characterized in that the transfer film setting device has an openable and closable sandwiching part for demolding the molded product.