JPH0829552B2 - Injection molding equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an injection molding device for a resin molded product, and more particularly to an injection molded product in which a cloth such as a woven fabric or a non-woven fabric is partially adhered to the surface. An injection molding apparatus suitable for manufacturing.

[Conventional technology]

2. Description of the Related Art In recent years, there is an increasing demand for improving the appearance by attaching a cloth such as a woven cloth or a non-woven cloth to the exterior part of the outfitting parts of a vehicle to decorate the exterior part and to give a high-class feeling.

Therefore, for example, "Nissan Laurel Catalog No. 4101A
As shown in "KK" (issued by Nissan Motor Co., Ltd. in October 1984), hair is planted on the core material of the front pillars, or cloth is not partially attached to the injection molded product, but it is partially attached. Attempts have been made to make the appearance luxurious by changing the color pattern.

As a conventional molding apparatus used to manufacture a molded article in which cloths are partially adhered (hereinafter referred to as "partial distribution-bonded molded article"), for example, JP-A-60-48324 is disclosed. As you can see, there is something like that shown in Figure 10.

This is a case of a forming apparatus by vacuum forming, in which a thin wall 2 is provided at a desired position of the vacuum forming die 1 and a vacuum forming surface 1a is formed in a predetermined region 3 divided by the thin wall 2 to form the vacuum forming die 1
An exhaust pipe 6, an exhaust cavity 7, a large number of exhaust holes 8 and the like communicating with a vacuum pump are provided therein.

Then, the cloth 4 is laid on the vacuum forming surface 1a, and both ends 4a of the cloth 4 are raised along the inner surface of the thin wall 2 and fixed to the thin wall 2, and then the cloth 4 is attached to the upper part of the cloth 4. A resin plate 5 having an adhesive or the like applied to the opposite surface is arranged as shown by an imaginary line, and air is sucked by a vacuum pump to form the resin plate 5 along the vacuum forming surface 1a and a cloth 4 on the surface. Is partially attached.

[Problems to be solved by the invention]

However, a molding apparatus capable of manufacturing such a conventional distribution-distributed molded product has a problem that the number of manufacturing processes is increased and the production cost is increased.

Therefore, a decorative cloth prepared in advance is temporarily attached by a double-sided tape or a magnet to a portion corresponding to a portion where the cloth is to be attached to the resin molded product of the injection molding die surface, A method of manufacturing a distributed distribution molded article at low cost by injecting molten resin into the mold after that can be considered, but there is a concern that the injection pressure at the time of injection of the resin may cause displacement of the fabric. I was having a hard time.

The present invention aims to solve such conventional problems.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention uses first and second dies that can be opened and closed by dividing the outer surface of an injection molded product and a third mold having a core that molds the entire inner surface of the injection molded product. By arranging these first, second and third molds in order and forming a molding space for injecting resin between the first and second molds and the third mold when all are closed An injection molding apparatus having a die group configured as described above, wherein a regulating rod extending in the direction of the other die is planted in one of the first die and the second die, and the regulating rod is provided. A protrusion is provided in the vicinity of the tip of the second mold, and the protrusion is abutted on the other mold so as to restrict the first and second molds from moving away from each other. One of the second and third molds is provided with a fitting member projecting toward the other mold, and the fitting is performed. A cloth is inserted between the first mold and the second mold by providing the other mold with a receiving portion for integrally holding the second and third molds by inserting the material. A cloth setting device for tensioning items is arranged, and the second and third molds move integrally with each other with the fitting member fitted in the receiving portion during the mold opening operation after injection molding. After the gap between the first mold and the second mold is opened, the protruding portion of the regulation rod is brought into contact with the contact portion and the second portion
The first mold is fixedly installed so that the fitting member is disengaged from the receiving part and the gap between the second mold and the third mold is opened when the movement of the mold is stopped. In addition, the present invention provides an injection molding apparatus characterized in that a moving means for moving the third mold toward and away from the first mold is provided.

Further, the cloth setting device may be arranged so as to stretch the cloth inserted between the second mold and the third mold.

[Action]

According to the injection molding apparatus configured as described above, when the cloths inserted between the first mold and the second mold are stretched by the cloth setting device, the first, second, and 3 Open the mold,
A cloth for decoration is inserted between the first mold and the second mold, and the cloth is stretched by a cloth setting device. After that, when these molds are closed to each other, the cloths slide along the core shape of the third mold into the molding space formed between the first mold and the second mold, and the molding space The outer cloth is the first mold and the second
While being pressed and sandwiched between the molds, a molding space for molding the entire injection-molded product is formed between the cores of the first and second molds and the third mold.

Here, if the resin is injected into this molding space, the cloth inserted into the portion of the outer surface of the injection-molded product of the first mold is attached to the outer surface of that portion of the injection-molded product. The product is molded.

Then, by the mold opening operation after the injection molding, the first mold and the second mold are first opened while the second and third molds are integrally held, so that the cloth of the molded product is adhered to the part. The outer surface is die-cut, and then the second die and the third die are opened, so that the adhered cloth is not peeled off and die-forming from the molded product is smoothly performed.

If a cloth is inserted between the cores of the second mold and the third mold, it is possible to make a full-face cloth-bonded molded product in which the cloth is bonded to the entire injection-molded product. It is also possible to make an injection-molded product in which no cloth is attached unless cloth is inserted therein.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 are cross-sectional views showing states of an injection molding apparatus according to an embodiment of the present invention when the mold is opened and when the mold is closed.

First, the structure thereof will be described. This injection molding apparatus has an openable and closable first mold 10 and a first mold 10 as shown in FIGS. 7 to 9 in which the outer surface of an injection molded product is divided into two parts in the height direction. 2 molds
20 and a third mold 30 having a core 31 for molding the entire inner surface of the injection-molded product.

The first mold 10 is a mold on the fixed side, and a molten resin is injected into the mold.
A fixed-side mounting plate 12 having a sprue bush 11 for guiding it into the mold from 11a is fixedly provided with a fixed-side mold plate 13 having a mold surface 13a for molding a part of the outer surface of the injection-molded product. .

The second mold 20 is a mold located between the first mold 10 and the third mold 30, and when the second mold 20 is fitted to the first mold 10, the remaining portion of the outer surface of the injection molded product is molded. A mold surface 20a is formed.

Further, the second mold 20 is provided with a relay passage 20b having a gentle expansion which communicates with the injection passage 11a of the sprue bushing 11.
And a stopper pin to be described later for connecting to the third mold 30.
A tapered hole 20c (corresponding to a receiving portion) into which 36 is fitted is formed.

In addition, a stopper pin 21 (corresponding to a regulating rod) is planted at an end portion (downward in FIG. 1) of the second mold 20, and a slide hole 13b is provided at a position where the fixed side mold plate 13 faces each other. The stopper 21a (corresponding to the protruding portion) fixed to the tip of the stopper pin 21 and the bottom of the stepped hole 12b for position regulation. 12c
(Corresponding to the contact portion), its movement is restricted within a predetermined range in the direction of arrow A in FIG.

The third mold 30 is a movable mold, and includes a movable mold plate 33 fixed to a movable mounting plate 32 and a core 31 fixed substantially at the center thereof.
And a movable plate 35 having a core 31 penetrating substantially in the center thereof and a biasing force constantly applied in a direction away from the movable side mold plate 33 by a spring 34 systematically attached to the movable side mounting plate 32. Consists of.

The movable plate 35 is provided with the middle path 20 provided in the second mold 20.
A submarine gate 35a communicating with b is formed.

The movable plate 35, the movable mounting plate 32, and the movable template
33 are connected by stopper pins 36.

The stopper pin 36 accommodates the head portion 36a in a stepped hole 32a having a bottom portion 32b formed in the movable side mounting plate 32 and penetrates the hole 33a in which the spring 34 formed in the movable side template 33 is accommodated to move the movable portion. The small diameter portion 36b fixed to the plate 35 is attached to the second mold 20.
It projects to the side.

An elastic member 37 (corresponding to a fitting member) having a drum-like outer surface made of, for example, hard urethane rubber, which can be inserted into and removed from the tapered hole 20c of the second mold 20, is screwed to the small diameter portion 36b. It is fixed so that it will not easily fall off even if a load is applied.

The die group consisting of the first die 10, the second die 20, and the third die 30 is a guide pin bush 12d, 20e, 35b provided at a required position at each end. Is guided by a sliding guide pin 38 and can be moved between the mold open state shown in FIG. 1 and the mold closed state shown in FIG. 2 by a hydraulic cylinder or the like as a moving means (not shown). There is.

Further, the stopper pin 21 provided between the first die 10 and the second die 20 and the stepped hole for position regulation of the fixed side mounting plate 12 are provided.
12b, the stopper pin 36 that is provided so that the second die 20 can be connected to the third die 30, the movable plate 35 that fixes the stopper pin 36, and the like are used to open the die during the die opening operation after injection molding. It constitutes a means to regulate the order.

Further, in order to partially attach the cloth 4 to the injection-molded article as shown in FIG. 7 or to the entire outer surface as shown in FIG. 8, for example, as shown best in FIG. It is convenient to use a cloth set device.

This cloth setting device is an example in which the trimming loss of the expensive decoration cloth 4 is minimized, and the outer circumference is stretched by a plurality of springs 41 to give a required tension, and an opening is formed in the center. A holding cloth 42 having a portion 42a is provided, the cloth 4 to be attached is arranged in the opening 42a, and is detachably held by a plurality of fasteners (eight in this example) 43.

The holding cloth 42 is a thin cloth that can expand and contract in both the vertical and horizontal directions, and the cloth 4 is always stretched by its spring effect to prevent the generation of wrinkles.

For the cloth 4, attach it between the first mold 10 and the second mold 20,
Alternatively, a through hole 4a is provided to prevent the flow of the molten resin from the injection passage 11a from being blocked by the cloth 4 when it is inserted between the second mold 20 and the third mold 30. ,
As shown in FIG. 1, the first die 10, the second die 20, and the third die 30 have grooves 13c, 20 for avoiding interference with the fastener 43.
d and 35c are formed respectively.

Next, a procedure and an operation for forming a distribution-distributed molded article P as shown in FIG. 7 by using the injection molding apparatus of this embodiment configured as described above will be described.

As shown in FIG. 1, when the injection molding die group of this apparatus is opened, the spring 41 and the holding cloth 42 of the cloth setting apparatus are set.
The outer periphery of the cloth 4 is held by the fastener 43 via the, and the cloth 4 is stretched between the first mold 10 and the second mold 20.

Next, when the third mold 30 is moved in the direction of arrow B in FIG. 1 and the mold is closed, the cloth 4 follows the shape of the core 31 and the fixed side mold plate.
Sliding into the molding space S ₁ (FIG. 2) formed between the mold surface 13a of 13 and the mold surface 31a of the core 31, the first mold 10, the second mold 20, and the third mold When the 30 is in close contact, as shown in FIG.
The fixed side mold plate 13 and the second mold 20 are pressed and sandwiched.

Further, the injection passage 11a of the sprue bush 11, which serves as a passage for the molten resin, the relay passage 20b, and the submarine gate 35a communicate with each other.

Further, the elastic member 37 fixed to the small diameter portion 36b of the stopper pin 36 fixedly mounted on the movable plate 35 is the taper hole 2 of the second mold 20.
Then, the movable plate 35 of the third mold 30 and the second mold 20 are joined to each other. At this time, the spring 34 is in a compressed state, and the stopper pin 36 is retracted (moved to the right in FIG. 1) to move the head 36.
a moves away from the bottom 32b of the stepped hole 32a of the movable side mounting plate 32.

After the mold is closed as shown in Fig. 2, the sprue bushing 11
When the molten resin is injected into the inner injection path 11a from a nozzle of a molten resin injection device (not shown), the molten resin is molded from the submarine gate 35a by the second mold 20 and the core 31 without forming the cloth 4. flows into the molding space S ₁ in which the fabric 4 is present between the space S ₂ and the first mold 10, and the cloth 4 is bonded by the anchor effect molten resin which has flowed into the molding space S ₁ is on the surface of the molding The molten resin that has flowed into the molding space S ₂ is molded without attaching a cloth.

When the first stage mold opening operation is performed after the molten resin is cooled and hardened, the elastic member 37 fixed to the stopper pin 36 fixed to the movable plate 35 is fitted into the taper hole 20c of the second mold 20. Since the movable plate 35 is engaged with the rear end of the molded product P attached to the core 31, as shown in FIG. 3, the second mold 20, the movable plate 35, and the movable side mold plate 33 are connected to each other. The core 31 and the movable side mounting plate 32
Together with the molded part distribution sticking molded product on the core 31, it moves backward to the right in the figure, and the stopper pin 21
21a moves until it comes into contact with the bottom 12c of the stepped hole 12b of the fixed-side mounting plate 12.

After that, when the movable side mounting plate 32 of the third mold 30 on which the movable side mold plate 33 is fixed is slightly retracted by the second stage mold opening operation, the second mold 20 is locked by the stopper pin 21. Since the movable plate 35 is also coupled to the second mold 20, the movable plate 35 cannot be moved, and the core 31 resists the adhesion force with the molded product P and releases the molded product P from the mold.

Accordingly, the second mold 20 and the movable plate 35 are springs.
The urging force of 34 causes the molded product P to move to the left in the figure, and as shown in FIG. 4, the head 36a of the stopper pin 36 is moved.
Stops at the position where it comes into contact with the bottom portion 32b of the stepped hole 32.

After that, the movable side mounting plate is moved by the third stage mold opening operation.
When 32 is further retracted, the second mold 20 will be stopped pin 21.
Since the stopper pin 36 moves to the right in the figure while still being locked to, the elastic member 37 separates from the taper hole 20c of the second mold, and the third mold 30 moves to the position shown in FIG. Then, the core 31 is completely released from the partial distribution-attached molded product P. By performing such smooth die-cutting, it is possible to easily take out from the second die 20 without damaging the cloth portion of the molded product P.

Finally, the unnecessary portion of the cloth 4 adhering to the molded product taken out is cut off to obtain a desired partial distribution bonded molded product P as shown in FIG.

Although a submarine gate is used as the gate in this embodiment, another gate may be used as long as the molten resin does not spread sufficiently in the molding space and does not cause sink marks or cracks in the molded product.

In addition, when the cloth adhered to the injection molded product has fine mesh, the resin does not penetrate into the surface of the cloth. However, in the case of the cloth in which the resin easily penetrates, the back surface of the cloth may have, for example, a latex or an adhesive. If a backing material such as tape, non-woven fabric, urethane-based or acrylic-based film is lined in advance, the resin will not penetrate into the surface of the cloth stuck to the injection-molded product.

Further, when it is desired to mold a full surface cloth-bonded molded product P'as shown in FIG. 8, between the second mold 20 and the third mold 30 as shown by the chain double-dashed line in FIG. If the cloth 4 is inserted into and the molding is performed in the same process as the case described above, it can be easily manufactured.

Further, if molding is performed without inserting cloth into the mold group, it is possible to manufacture an injection molded product P ″ shown in FIG.

[Effects of the Invention] As described above, when the injection molding apparatus according to the present invention is used, the first mold and the second mold are set by the cloth setting apparatus.
If you want to stretch the cloth that is inserted between the molds,
A cloth for decoration is inserted between a first mold and a second mold that can be opened and closed by dividing the outer surface of the injection-molded product, and the cloth is stretched by a cloth setting device. After that, all of these molds and a third mold having a core that molds the entire inner surface of the injection-molded product are closed, and the molten resin is injected into the molding space formed between the molds. A small amount of manufacturing process, because the cloth is attached only to the outer surface of the injection-molded product molded by the mold and injection-molded Since it is possible to easily produce a distributed distribution molded article, the production cost can be reduced.

Also, by inserting a cloth between the second mold and the third mold, it is possible to make a full surface cloth-bonded molded product, and if the cloth is not inserted between the molds, the cloth bonding is not performed at all. A molded product can be easily manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a mold open state of an injection molding apparatus showing an embodiment of the present invention, FIG. 2 is a sectional view showing the mold closed state, and FIGS. 5 is a sectional view similar to FIG. 2 showing the different mold opening steps, FIG. 6 is a plan view showing an example of the cloth setting device, and FIGS. 7 to 9 are injection moldings of this embodiment. FIG. 10 is a perspective view showing an example of different injection-molded products molded by using the apparatus, and FIG. 10 is a cross-sectional view showing an example of a conventional molding device for producing a distributed distribution-molded product. 4 …… Cloth, 10 …… First mold 12 …… Fixed side mounting plate, 13 …… Fixed side mold plate 20 …… Second mold, 21 …… Stopper pin 30 …… Third mold, 31 …… Core 32 …… Movable side mounting plate, 33 …… Movable side mold plate 35 …… Movable plate, 36 …… Stupper pin P …… Part distribution pasting product, P ′ …… Full surface cloth pasting product P ″ …… Cloth pasting not at all the injection-molded articles S _1, S _2, ...... molding space

Claims (2)

[Claims] 1. An injection-molded article comprising outer and first molds that can be opened / closed to mold the outer surface of the injection-molded article, and a third mold having a core that molds the entire inner surface of the injection-molded article. A metal mold in which a first mold, a second mold and a third mold are arranged in order and a molding space for injecting a resin is formed between the first mold, the second mold and the third mold when all are closed. An injection molding apparatus having a mold group, wherein a restriction rod extending in the direction of the other mold is planted in one of the first and second molds, and protrudes near the tip of the restriction rod. A second contact part, the second mold part is provided with an abutting part for restricting mutual movement of the first and second molds by contacting the protruding part. (3) A fitting member that projects in the direction of the other mold is provided in one of the molds, and the fitting member is fitted into the mold. A cloth for tensioning cloths inserted between the first mold and the second mold by providing the other mold with a receiving portion for holding the second and third molds integrally. A setting device is provided, and at the time of mold opening operation after injection molding, the second and third molds move integrally with the first mold with the fitting member fitted in the receiving portion. After the gap between the second mold and the second mold is opened, the protruding portion of the restriction rod is brought into contact with the contact portion to stop the movement of the second mold, whereby the fitting member is separated from the receiving portion. Then, the first mold is fixedly installed so that the space between the second mold and the third mold is opened, and the third mold is moved toward and away from the first mold. An injection molding apparatus, characterized in that it is provided with a moving means that can be moved. 2. An injection-molded article, comprising first and second dies that can be opened and closed by dividing the outer surface of the injection-molded article and a third die having a core that molds the entire inner surface of the injection-molded article. A metal mold in which a first mold, a second mold and a third mold are arranged in order and a molding space for injecting a resin is formed between the first mold, the second mold and the third mold when all are closed. An injection molding apparatus having a mold group, wherein a restriction rod extending in the direction of the other mold is planted in one of the first and second molds, and protrudes near the tip of the restriction rod. A second contact part, the second mold part is provided with an abutting part for restricting mutual movement of the first and second molds by contacting the protruding part. (3) A fitting member protruding in the direction of the other mold is provided in one of the molds, and the fitting member is fitted into the mold. By providing a receiving portion for holding the second and third molds integrally on the other mold, and cloth for tensioning cloths inserted between the second mold and the third mold A setting device is provided, and at the time of mold opening operation after injection molding, the second and third molds move integrally with the first mold with the fitting member fitted in the receiving portion. After the gap between the second mold and the second mold is opened, the protruding portion of the restriction rod is brought into contact with the contact portion to stop the movement of the second mold, whereby the fitting member is separated from the receiving portion. Then, the first mold is fixedly installed so that the space between the second mold and the third mold is opened, and the third mold is moved toward and away from the first mold. An injection molding apparatus, characterized in that it is provided with a moving means that can be moved.