JP3531269B2 - Method and apparatus for manufacturing resin molded article having core material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a resin molded product in which a core material is embedded by injection molding.

[0002]

2. Description of the Related Art As a decorative component such as an automobile body side molding, a resin molded product in which a core material for retaining the shape of the molded product is embedded in a resin is used.
For such a resin molded product, a plate-shaped member such as a metal plate is used as a core material, and the core material is placed at a predetermined position inside the plate-shaped molded product, and is completely exposed so as not to be exposed to the outside. Some are buried.

In order to manufacture such a resin molded product by injection molding, special consideration is required in order to hold the core material in the molding die. For example, when injection molding is performed with the core material sandwiched between injection molding dies, the core material is exposed from the molded body, and therefore the exposed surplus portion must be cut out later. To completely embed the core material, insert a core material that is smaller than the cavity of the mold, hold it in a predetermined position inside the cavity and inject the resin, but in the cavity There is a problem that the core material moves in the cavity due to the resin flow or the resin injection pressure and is displaced from a predetermined position, or the core material is deformed.

On the other hand, in the case of holding a part of the core material by sandwiching it between the molding dies, the resin is injected while the core material in the cavity is held by the slide die, and the resin is slid when the cavity is almost filled with the resin. A method has been proposed in which the mold is retracted, and further the resin is injected to perform molding (Japanese Patent Laid-Open No. H04-264242).
-16316). However, this method is suitable for holding a part of the core material by sandwiching it between the molds, but when holding the core material in a state of being separated from the mold surface, the core is caused by the resin flow after the slide mold retreats. Since the material may move, it is difficult to embed the core material at a predetermined position.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a resin molded product in which a core material is embedded so as to be placed at a predetermined position of a molded product by a simple device and operation. It is to propose a method and an apparatus for manufacturing.

[0006]

The present invention provides the following method and apparatus for producing a resin molded product. (1) A cavity mold having a mold surface corresponding to the outer surface side of a molded product, a core mold having a dividing surface with the cavity mold, and a slide provided in the core mold so as to be able to move forward and backward toward the cavity mold side. In the cavity formed between the core die and the slide core die, at the position where the slide core die is advanced, the tip of the slide core die holds a core material having an outer dimension smaller than the cavity, and the die is closed. From the first resin flow path to the first partial cavity formed in the advanced position
At the stage where the first resin is injected through the first gate to form the first resin portion including the outer surface portion of the molded product and integrated with the core material, and the core material is fixed to the first resin portion. The slide core mold is retracted to form a second partial cavity between the slide core mold and the core material, and a second partial cavity is formed in the second partial cavity .
By injecting the second resin from the resin flow path through the second gate to form the second resin portion including the back surface portion of the molded product, and integrating with the first resin portion and the core material. A method for producing a resin molded product having a core material, wherein the material is embedded. (2) A cavity mold having a mold surface corresponding to the outer surface side of the molded product, a core mold having a dividing surface with the cavity mold, and a slide provided in the core mold so as to be able to move forward and backward toward the cavity mold side. In the cavity formed between the core die and the slide core die, at the position where the slide core die is advanced, the tip of the slide core die holds a core material having an outer dimension smaller than the cavity, and the die is closed. From the first resin flow path to the first partial cavity formed in the advanced position
At the stage where the first resin is injected through the first gate to form the first resin portion including the outer surface portion of the molded product and integrated with the core material, and the core material is fixed to the first resin portion. The slide core mold is retracted to form the second partial cavity between the slide core and the core material, and the second partial cavity is formed in the second partial cavity .
A second resin is injected from the second resin flow path through the second gate to form a second resin portion including the back surface of the molded product,
A method for manufacturing a resin molded product having a core material, wherein the core material is embedded by being integrated with the first resin portion and the core material. (3) The method according to (1) or (2) above, wherein the first resin and the second resin are the same resin. (4) The method according to (1) or (2) above, wherein the first resin and the second resin are different resins. (5) The method according to (4) above, wherein the second resin is a recycled material. (6) The method according to any one of (1) to (5) above, wherein when the second resin is injected into the second partial cavity, the core material is injected in the direction of pressing the cavity mold direction. (7) A cavity mold having a mold surface corresponding to the outer surface side of the molded product, a core mold having a dividing surface for the cavity mold, and a core mold provided in the core mold so as to be able to move forward and backward with respect to the cavity mold side Slide core type, the cavity type,
A core material holding portion provided at the tip of the slide core mold so as to hold a core material having an outer dimension smaller than the cavity formed by the core mold and the slide core mold, and the slide core mold are formed at the forward position. The first resin flow path and the gate for injecting the first resin into the first partial cavity are provided at positions different from the first resin flow path and the gate, and are formed at the slide core type retracted position. An apparatus for manufacturing a resin molded product having a core material, comprising: a second resin flow path for injecting a second resin into the second partial cavity; and a gate. (8) The device according to (7), wherein the core material holding portion includes a magnet that attracts the core material. (9) The device according to (7) above, wherein the core material holding unit includes a vacuum suction tool that suctions the core material. (10) The apparatus according to any one of (7) to (9) above, wherein the core material holding portion includes a protrusion protruding toward the cavity mold side along the outer peripheral edge portion of the held core material. (11) A switching valve for the resin flow path, which selectively communicates with the resin flow path, is provided between the first resin flow path and the second resin flow path, and the switching valve is on the injection molding machine side. The apparatus according to any one of (7) to (10), which is connected to one of the resin supply passages. (12) The first resin flow path and the second resin flow path are both independent, and each is connected to another independent resin supply path on the injection molding machine side (7) to (10). The device according to any one of 1.

The resin molded product to be manufactured in the present invention is a molded product in which a core material is embedded in the molded product, and its shape is arbitrary, but the outer surface side to be a decorative surface and the mounting portion. Those having a back side that becomes, especially those having a plate shape or a shape close to a plate shape are suitable. An example of such a resin molded product is an automobile decoration member, but other molded products may be used.

The first method for forming a resin molded product in the present invention
The resin can be used that has characteristics required for a resin molded product as a product, such as PVC, PP, PET,
Any resin such as ABS or PC can be used. The second resin may be the same as or different from the first resin. In the case of the same resin, the SP values of the first and second resin parts are the same, so they are welded to each other and have excellent adhesiveness,
The overall properties of the molded product become uniform. When a different resin is used, different properties, colors, hardness, etc. required for the first and second resin parts can be imparted, and a recycled material ( Recycled material) can also be used.

The core material is mainly used for imparting shape retention and stretch resistance to a molded product, and any material can be used as long as it has such characteristics. Examples thereof include plate members such as metal plates such as aluminum plate, steel plate, plated steel plate, stainless steel plate and hard resin plate, and linear members such as steel wire and brass wire, as well as ceramics, wood and paper. . When manufacturing a plate-shaped resin molded product, a plate-shaped core material is preferable.

It is preferable to provide a fixing means for the core material in order to improve the adhesiveness with the first and second resins. As the fixing means, for example, in addition to forming a hot-melt type adhesive layer whose welding performance works by the heat of the injected resin, a connecting hole is formed instead of or in combination with the first adhesive layer.
Another example is a method in which the second resin is connected to the core material to improve the adhesiveness. The core material is used in a state where the outer dimensions are smaller than the cavity of the injection mold.

An injection mold for forming a resin molded product is formed by a cavity mold, a core mold, and a slide core mold, and a core material holding portion is formed at the tip of the slide core mold. The core material holding portion holds the core material so that the core material does not move during injection of the first resin, and a protrusion protruding toward the cavity mold side is provided along the outer peripheral edge of the core material,
When the core material is an iron-based magnetic material, a magnet can be used, and when the core material has a surface capable of attracting, a material including a vacuum suction tool can be used. In addition, hooking means such as hooks and other means can be used.

[0012]

According to the method of manufacturing a resin molded product by the manufacturing apparatus of the present invention, first, the slide core mold is moved forward, and the core material is held in the core material holding portion formed at the tip of the slide core mold. The first resin is injected from the first resin channel through the first gate into the first partial cavity formed by clamping the cavity mold and the core mold together, and the outer surface portion of the molded product is A first resin portion including the first resin portion is formed and integrated with the core material. In this state, the pressure is maintained for a while and the first resin is cured to some extent to fix the first resin portion and the core material, and the slide core mold is retracted to form the second partial cavity. At this time, since the core material remains attached to the first resin portion, the second resin is injected from the second resin flow path into the second partial cavity through the second gate to include the back surface portion of the molded product. The second resin portion is formed and integrated with the first resin portion and the core material to embed the core material to manufacture a resin molded product. The second resin may be synchronously injected into the second partial cavity whose volume gradually increases while the slide core mold is retracted.

In the above manufacturing method, the first resin is formed by injecting the first resin in a state where the core material is held in the slide core type core material holding portion, so that the core material is held at the held position. Integrated with the first resin part. Further, the second resin is injected from this state in a state where the slide core mold is retracted or while the slide core mold is retracted to form the second resin portion to be integrated, so that the core material is embedded at a predetermined position. Thus, in the present invention, a core material having an outer size smaller than the cavity is embedded in a predetermined position of the resin molded product.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a resin molded product manufactured in Examples, FIG. 1 (a) is a plan view, FIG. 1 (b) is a front view, and FIG.
1A is a sectional view taken along the line AA of FIG. 1A, FIG. 1B is a sectional view taken along the line BB, and FIGS. 2C and 2D are enlarged views of a C portion of FIG. 2B. In FIGS. 1 and 2, reference numeral 1 denotes a resin molded product used as a body side molding that is a decorative component of an automobile, and is provided between the first resin portion 2 and the second resin portion 3.
A plate-shaped core material 4 is embedded.

The outer dimension of the core material 4 is smaller than the outer dimension of the molded product 1 and is embedded in the molded product 1. The first resin part 2 is entirely on the outer surface side 5 serving as the decorative surface of the molded product 1, the core material 4
It is formed so as to include one surface side of the both surfaces located on the outer surface side 5. The second resin portion 3 is formed so as to include the back surface portion 6 of the molded product 1 excluding the peripheral portion of the molded product 1.
The resin portion 2 and the core material 4 are fixed and integrated.
As a fixing means for the core material 4, adhesive layers 7 are formed on both surfaces of the core material 4 in FIG. 2C, and a connecting hole 8 is formed in FIG. 2D.
Are formed. The connecting hole 8 may have any shape such as a round hole 8a, an inclined hole 8b, a burring hole 8c, and a countersink hole 8d. An annular recessed groove 3a formed on the back surface 6 is a mark of a protruding portion provided on a holding portion of a core material 4 of an injection molding die, which will be described later, and is integrally molded by the recessed groove 3a. First resin part 2 and second resin part 3
It forms the boundary with.

FIG. 3 shows an injection molding die, (a) is a sectional view corresponding to DD of FIG. 4, (b) is an EE sectional view of FIG. 3 (a), and FIG. 4 is a plan view of the core die. 5 is a partially enlarged view of FIG. 3 (b), and FIGS. 6 (a) and 6 (b) are partially enlarged views of FIG. 3 (a).

The injection mold 10 is composed of a cavity mold 11, a core mold 12, and a slide core mold 13, and a cavity 14 is formed by these. The cavity mold 11 has a mold surface 11 a corresponding to the outer surface shape 5 of the molded product 1. Core mold 12 is cavity mold 1
1 and a mold surface 12a corresponding to the peripheral portion on the back surface side of the molded product 1. The slide core mold 13 is provided in the core mold 12 so as to be able to move forward and backward toward the cavity mold 11 side, and has a mold surface 13a corresponding to the central portion of the back surface portion 6 of the molded product 1.

On the die surface 13a at the tip of the slide core die 13, a holding concave portion 1 is surrounded by a projecting edge 16a which projects as a core material holding portion toward the cavity die 11 side.
6 and the magnet 17 are formed. The holding concave portion 16 has a structure for holding the core material 4 so as not to project from the tip portion. The magnet 17 should just hold | maintain so that the core material 4 may not move at the time of injection of resin, and may be a permanent magnet or an electromagnet. The slide core mold 13 slides with the core mold 12 by means of a fluid pressure cylinder 18 such as a hydraulic cylinder, and can move forward and backward. When the slide core mold 13 is advanced, the cavity mold 11, the side faces 13b of the core mold 12 and the slide core mold 13, and the one face of the core material 4 held by the mold face 13a at the tip of the slide core mold 13
Part cavity 14a is formed, and after the first resin part 2 is formed in this state, when the slide core mold 13 retracts, the first resin part 2 and the mold surface 13a at the tip of the slide core mold 13 The second partial cavity 14b is formed between them. The core mold 12 can also be moved forward and backward with respect to the cavity mold 11 to close the mold to open the mold, but the moving mechanism is not shown.

The cavity mold 11 is provided with one resin supply passage 21 communicating with the resin injection nozzle 20 of the injection molding machine, and the sprue changeover block 2 as a flow passage changeover valve 2.
2 by the first sprue 23a and the second sprue 23b
It is configured to selectively select and switch the flow paths. That is, the sprue switching block 22 includes the flow path 22a,
22b, and is moved forward and backward by a fluid pressure cylinder 24 such as a hydraulic cylinder to connect the resin supply passage 21 to the first and second sprues 23a and 23b.
Band heaters 25a and 25b are provided around the resin supply path 21 and the sprue switching block 22, and the resin is heated in this portion to a softened state where it can be always injected.

The first sprue 23a is a cavity mold 11
And a first runner 26 formed between the core mold 12
a and the first gate 27a formed on the core mold 12
Through to the cavity 14. The second sprue 23b is provided inside the slide core mold 13 through a second runner 26b formed between the cavity mold 11 and the core mold 12 and a third sprue 27b formed on the core mold 12. It is adapted to communicate with the second submarine gate 27c. In this embodiment, "sprue" and "runner" use different terms depending on the difference in shape, but both are "resin flow path".
Is used as.

The third sprue 27b and the second gate 27c are always communicated with each other in both the retracted position and the advanced position of the slide core mold 13.
A resin injection passage 28 that opens toward the cavity 14 is formed at a position where the slide core mold 13 communicates with the second gate 27c. The size of the opening of the resin injection passage 28 in the mold surface 13a at the tip of the slide core mold 13 is preferably such that the core material 4 is not deformed by the injection pressure of the first resin described later. .

In the method of manufacturing the resin molded product 1 by the above-described manufacturing apparatus, first, the adhesive layer 7 and / or the connecting hole 8 are formed in the mold open state as shown in FIGS. 2 (c) and 2 (d). The core material 4 that can be attracted by the magnet
The projecting edge 16a is set so as not to straddle the holding recessed portion 16 as a core material holding portion formed on the mold surface 13a at the tip of, and is held by being attracted by the magnet 17. As a result, the core material 4 is held in contact with almost the entire mold surface 13a at the tip of the slide core mold 13. In this state, core type 1
2 is advanced and the cavity mold 11 and the core mold 12 are aligned and clamped. Then, by the fluid pressure cylinder 18, as shown in FIG.
As shown in (a), (b), FIG. 5, and FIG. 6 (a), the slide core mold 13 is moved forward to move the first partial cavity 14
a is formed. It is also possible to advance the slide core mold 13 first and then set the core material 4, and which one should be selected may be selected in consideration of workability. When the core material 4 is held by vacuum attraction instead of the magnet 17,
A vacuum suction tool may be provided in the same portion as the magnet 17 to hold the core material by applying a negative pressure and pressurize at the time of release to facilitate release.

On the other hand, the fluid pressure cylinder 24 is used to retract the sprue switching block 22, and the resin supply passage 21 is connected to the first sprue 2 by the passage 22a as shown in FIG. 3 (b).
Communicate with 3a. Then, the resin is injected from the resin injection nozzle 20, and the first resin 29a is injected from the first runner 26a through the first gate 27a into the first partial cavity 14a as shown in FIG. Outer surface side 5
The first resin portion 2 including is formed and integrated with the core material 4.
At this time, the injected and flowing first resin 29a goes over the projecting edge 16a and then covers the core material 4, so that the core material 4 is not turned up from its end. In this state, the pressure is maintained for a while and the first resin portion 2
Is cured to some extent (hardness such that it is not deformed by the pressure when the second resin is injected), and the first resin portion 2 and the core material 4 are fixed.

From this state, the slide core mold 13 is retracted by the fluid pressure cylinder 18 to move the second partial cavity 1
4b is formed. At this time, if necessary, slide core type 1
The core material 4 can be reliably separated from the mold surface 13a at the tip of the slide core mold 13 by an extrusion pin (not shown) for separating the core material 4 from the core material 4. The second sprue 27b and the second gate 27c remain in contact with each other even though their positional relationship is deviated. Subsequently, the fluid pressure cylinder 24 advances the sprue switching block 22 to move the flow path 22 as shown in FIG.
The resin supply path 21 communicates with the second sprue 23b by b. As a result, the second resin 29b is injected from the second runner 26b through the third sprue 27b, the second gate 27c, and the resin injection passage 28 into the second partial cavity 14b to include the back surface portion 6 of the molded product 1. The resin material 1 is manufactured by forming the second resin portion 3 and embedding the core material 4 by integrating with the first resin portion 2 and the core material 4. Since the resin injected from the resin injection passage 28 is injected in the direction in which the core material 4 is pressed toward the cavity mold 11, the movement of the core material 4 is prevented.

In the above manufacturing method, the slide core mold 13 is used.
The core material 4 is held in the holding recess 16 of the first resin 2 in a state of being supported in contact with almost the entire mold surface 13a at the tip.
In order to form the first resin portion 2 by injecting 9a, the core material 4
Is integrated with the first resin portion 2 at the held position. In addition, when the slide core mold 13 is retracted from this state, the second
The resin 29b is injected to form the second resin portion 3 and integrated, so that the core material 4 is accurately embedded in a predetermined position. In this way, the core material 4 having an outer size smaller than the cavity 14 is completely embedded in a predetermined position of the resin molded product 1. When injecting the second resin 29b, the slide core mold 13
It is also possible to inject the second resin 29b in accordance with the increasing volume while increasing the volume of the second partial cavity 14b while retreating, thereby making the molding time shorter than the former. You can At this time, the backward movement of the slide core mold 13 and the injection of the second resin are controlled so as to be synchronized with each other.

Although the above-mentioned embodiment is an example in which the first and second resins are the same resin, FIG. 7A shows the injection molding of the second embodiment in which the first and second resins are different resins. FIG. 9 is a cross-sectional view corresponding to F-F in FIG. 8 showing a mold, and taken along line H-H in FIG.
FIG. 7B is a sectional view, FIG. 7B is a sectional view taken along line GG of FIG. 7A, and FIG. 8 is a plan view of the core type. In this embodiment, the cavity mold 11 is provided with the first resin supply path 21a and the second resin supply path 21b separately, and the resin injection nozzles 20a, 20b and the first and second resin injection nozzles 20a, 20b of another injection molding machine are provided. Different from the first embodiment in that it is configured to communicate with the sprues 23a and 23b and inject different first and second resins 29a and 29b, and that it does not have a resin flow path switching valve. The configuration of the other parts is basically the same as that of the first embodiment.

In the method of manufacturing the resin molded product 1 using the above apparatus, the resin injection nozzle 20a is clamped at the position where the core material 4 is held and the slide core mold 13 is advanced as shown in FIG.
To supply the first resin 29a from the first resin supply path 21.
a, the first sprue 23a, the first runner 26a, the first gate 27a, and the first partial cavity 14a.
Then, the first resin portion 2 is formed by injection and is integrated with the core material 4. Then, when the first resin portion 2 is cured to some extent, the slide core mold 13 is retracted, the second resin 29b is supplied from the second resin injection nozzle 20b, the second resin supply passage 21b, and the second resin supply path 21b. Sprue 23b, second runner 26b, third sprue 27b, second gate 27c,
It is injected into the second partial cavity 14b through the resin injection passage 28, the second resin portion 3 is formed and integrated, and the resin molded product 1 is manufactured. The timing of retreating the slide core mold 13 and the injection of the second resin can be synchronized in the same manner as that described in the first embodiment.

In the second embodiment, as the second resin 29b, a resin different from the first resin 29a in color, hardness, presence / absence of the amount of reinforcing material such as fibers, and the like, and other properties are used. Multiple molding can be performed, and a recycled material can be used as the second resin, in which case the material cost can be reduced.

9 to 11 show another third embodiment in which the same resin is used as the first and second resins, but the construction of the manufacturing apparatus is different, and FIG. 9 (a) shows injection. 10 showing a molding die, which is a sectional view corresponding to I-I in FIG. 10, FIG. 9B is a sectional view corresponding to JJ in FIG. 10, FIG. 10 is a plan view of the core die, and FIGS. 11A and 11B are diagrams. 9 (a) is a partially enlarged view of FIG.
In this embodiment, one sprue 23 communicates with one resin supply path 21, and the first and second runners provided at the position of the sprue 23 and the dividing surface 15 between the cavity mold 11 and the core mold 12. A sprue switching block 22 is provided in the core mold 12 so as to move forward and backward toward the cavity mold 11 side at the communicating portion of the fluid cylinders 26a and 26b.
It is configured to move forward and backward by 4 to switch the flow path. The size of the tip 22c of the sprue switching block 22 on the side of the cavity mold 11 is the same as that of the core mold 12 of the sprue 23.
It is made larger than the size of the opening 23c on the side, and when the switching block 22 advances, the tip 22c abuts the dividing surface 15 of the cavity mold 11 to close the opening 23c,
As a result, the sprue 23 is separated by the dividing surface 15 of the cavity mold 11.
The first runner 26 on the side of the dividing surface 15 of the core mold 12 that is communicated only with the first runner 26a formed in the concave shape on the side.
It does not communicate with the second runner 26b formed in a groove shape at a position different from a.

In the method of manufacturing the resin molded product 1 by the above apparatus, as shown in FIGS. 9 (a) and 11 (a), the mold is clamped, the fluid pressure cylinder 18 holds the core material 4, and the slide core is held. The mold 13 is moved forward. On the other hand, the fluid pressure cylinder 24
When the resin is supplied from the resin injection nozzle 20 with the sprue switching block 22 moved forward by the above and the opening 23c at the tip of the sprue 23 is closed, as shown in FIG. 9B, the first resin is the resin supply path. 21, sprue 23, first
Is introduced into the first partial cavity 14a through the runner 26a, the first gate 27a, and forms the first resin portion 2.

When the first resin portion 2 is cured to some extent, the fluid pressure cylinder 18 retracts the slide core mold 13 and the fluid pressure cylinder 24 retracts the sprue switching block 22. As a result, a space is created between the tip 22c of the switching block 22 and the tip of the sprue 23 (the same as the opening 23c), and this space communicates with the second runner 26b. Further, although the sprue 23 and the first runner 26a are still in communication with each other, the first resin 29a injected earlier remains in the first runner 26a, so that there is room for the second resin to enter. No, therefore sprue 23 and first runner 26
a becomes equal to that mechanically cut off, and as a result, the sprue 23 is communicated only with the second runner 26b, and the first flow path is switched to the second flow path. Become. The resin of the sprue 23 is the second resin 29.
The second runner 26b and the third sprue 27 as b
b through the second gate 27c and the resin injection passage 28
Then, the second resin portion 3 is formed by injection into the partial cavity 14b, and the resin molded product 1 is manufactured.

In each of the above-mentioned embodiments, the example of manufacturing the body side molding, which is a decorative component for automobiles, is shown as the resin molded product 1. However, other resin molded products can be manufactured. The shape of the cavity 14 and other structures of the molding die 10 can be changed according to the above. Further, in each of the above-described embodiments, the case where both the first and second gates are provided has been described, but in particular, the second gate can be provided at a plurality of places to facilitate the filling of the second resin.

[0033]

According to the manufacturing method of claim 1 of the present invention,
With the core material having an outer dimension smaller than that of the cavity being held at the tip of the slide core mold ,
The first resin portion is formed by injecting the first resin through the gate, and the slide core mold is retracted in a state where the first resin portion is cured to some extent, and the second gate is removed from the second resin flow path.
Since the second resin portion is formed by injecting the second resin therethrough, it is possible to inject the resin by holding it at a predetermined position without moving the core material by a simple device and operation. As a result, a resin molded product in which the core material is embedded so as to be arranged at a predetermined position of the molded product can be manufactured by injection molding.

According to the manufacturing method of claim 2 of the present invention, in addition to the effect of claim 1, injecting the second resin while retracting the slide core mold in a state where the first resin portion is cured to some extent. As a result, the molding time can be shortened.

According to the manufacturing method of claim 3 of the present invention, by using the same resin as the first and second resins, the first and second resins are excellent in sticking property and have a uniform property as a whole. It is possible to manufacture a molded product having

According to the manufacturing method of claim 4 of the present invention, by using different resins as the first and second resins, it is possible to form and integrate resin portions having different physical properties such as color and hardness. it can.

According to the manufacturing method of the fifth aspect of the present invention, by using the recycled material, the recycled material can be used in an arbitrary portion, particularly in a portion where decorativeness is not required, and resources can be effectively used.

According to the manufacturing method of claim 6 of the present invention, the core material can be prevented from moving by injecting the second resin in the direction of pressing the core material toward the cavity mold.

According to the manufacturing apparatus of claim 7 of the present invention, since the slide core mold having the core material holding portion is provided so as to be able to move forward and backward, the core material having an outer size smaller than the cavity is held in the cavity, A resin molded product can be efficiently produced by the above method.

According to the manufacturing apparatus of the eighth aspect of the present invention, by adsorbing the core material by the magnet, the core material can be held and injection molded by a simple device and operation.

According to the manufacturing apparatus of claim 9 of the present invention, by holding the core material by the vacuum suction tool, the core material is securely held for injection molding, and the mold release is facilitated by blowing air. Can be

According to the manufacturing apparatus of the tenth aspect of the present invention, by providing the protrusions along the outer peripheral edge of the core material, the core material can be easily positioned and set, and the flow of the resin and the injection pressure can be used. It is possible to prevent the core material from shifting.

According to the manufacturing apparatus of claim 11 of the present invention,
By selectively switching between the first resin flow path and the second resin flow path with the switching valve, the same first resin and second resin can be simply and simply configured by the first partial cavity and the temporal change. It can be injected into the second partial cavity with a delay.

According to the manufacturing apparatus of claim 12 of the present invention,
By allowing the resin to flow independently from the first resin flow path and the second resin flow path, the first resin and the second resin having different properties from the first resin are respectively supplied to the first partial cavity and the second resin. Can be reliably injected into the partial cavity.

[Brief description of drawings]

FIG. 1A is a plan view of a resin molded product manufactured in an embodiment, and FIG. 1B is a front view.

2A is a sectional view taken along the line AA of FIG. 1A, FIG. 2B is a sectional view taken along the line BB, and FIGS. 2C and 2D are enlarged views of a C portion of FIG. 2B.

FIG. 3 (a) is a view showing the injection molding die of the embodiment, which is indicated by D- in FIG.
Sectional view equivalent to D, (b) is an EE sectional view of (a).

FIG. 4 is a plan view of the core mold of FIG.

5 is a partially enlarged view of FIG. 3 (b).

6 (a) and 6 (b) are partial enlarged views of FIG. 3 (a).

7A is a sectional view corresponding to FF of FIG. 8 showing an injection mold of another embodiment, and FIG. 7B is a sectional view taken along line GG of FIG.

8 is a plan view of the core mold of FIG. 7. FIG.

9A is a sectional view corresponding to II of FIG. 10 showing an injection mold of still another embodiment, and FIG. 9B is a sectional view corresponding to JJ.

FIG. 10 is a plan view of the core mold of FIG.

11 (a) and (b) are partially enlarged views of FIG. 9 (a).

[Explanation of symbols]

1 Resin molded product 2 First resin part 3 Second resin part 4 core material 5 outer surface side 6 Back side 7 Adhesive layer 8 connection holes 10 Injection mold 11 cavity type 11a, 12a, 13a Mold surface 12 core type 13 Slide core type 14 cavities 14a First partial cavity 14b Second partial cavity 15 division planes 16 Holding recess 17 magnets 18, 24 Fluid pressure cylinder 20, 20a, 20b Resin injection nozzle 21,21a, 21b Resin supply path 22 Sprue switching block (resin flow path switching valve) 22c Sprue cavity side tip 23 sprue 23a First sprue 23b Second sprue 23c Sprue core side opening 25a, 25b band heater 26a First runner 26b Second runner 27a First gate 27b Third sprue 27c Second gate 28 Resin injection path 29a First resin 29b Second resin

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-61-189914 (JP, A) JP-A-5-21492 (JP, A) JP-A-6-278162 (JP, A) JP-A-7- 60782 (JP, A) JP 7-304060 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B29C 45/00-45/84

Claims (12)

(57) [Claims] 1. A cavity mold having a mold surface corresponding to the outer surface side of a molded product, a core mold having a dividing surface with the cavity mold, and a cavity mold inside the core mold that can move forward and backward toward the cavity mold side. In the cavity formed between the slide core mold and the slide core mold, the slide core is held closed at the tip of the slide core mold at the advanced position while holding the core material having an outer dimension smaller than the cavity. The first resin flow path passes through the first gate to the first partial cavity formed at the advance position of the mold.
Resin is injected to form the first resin part including the outer surface of the molded product and is integrated with the core material. When the core material is fixed to the first resin part, the slide core mold is retracted. A second partial cavity is formed between the slide core mold and the core member, and the second resin flow path is connected to the second gate in the second partial cavity .
A second resin is injected through the mold to form a second resin portion including the back surface of the molded product, and the core material is embedded by being integrated with the first resin portion and the core material. Of manufacturing a resin molded product having a core material to be used. 2. A cavity mold having a mold surface corresponding to the outer surface side of the molded product, a core mold having a dividing surface with the cavity mold, and a cavity mold inside the core mold that can move forward and backward toward the cavity mold side. In the cavity formed between the slide core mold and the slide core mold, the slide core is held closed at the tip of the slide core mold at the advanced position while holding the core material having an outer dimension smaller than the cavity. The first resin flow path passes through the first gate to the first partial cavity formed at the advance position of the mold.
Resin is injected to form the first resin part including the outer surface of the molded product and is integrated with the core material. When the core material is fixed to the first resin part, the slide core mold is retracted. While forming the second partial cavity between the slide core and the core material, the second partial cavity is formed in the second partial cavity .
The second resin is injected from the resin flow path through the second gate to form the second resin portion including the back surface portion of the molded product, and the first resin
A method for producing a resin molded product having a core material, wherein the core material is embedded by being integrated with the resin part and the core material. 3. The method according to claim 1, wherein the first resin and the second resin are the same resin. 4. The method according to claim 1, wherein the first resin and the second resin are different resins. 5. The method according to claim 4, wherein the second resin is a recycled material. 6. The method according to claim 1, wherein when the second resin is injected into the second partial cavity, the core material is injected in a direction in which the core material is pressed in the cavity mold direction. 7. A cavity mold having a mold surface corresponding to the outer surface side of a molded product, a core mold having a dividing surface for the cavity mold, and a forward and backward movement within the core mold with respect to the cavity mold side. A slide core mold provided, and a core material holder provided at the tip of the slide core mold so as to hold a core material having a smaller outer dimension than the cavity mold, the cavity formed by the core mold and the slide core mold. Section, a first resin flow path and a gate for injecting a first resin into a first partial cavity formed at a slide core type forward position, and a first resin flow path and a gate provided at different positions. And a second resin flow path for injecting the second resin into the second partial cavity formed at the retracted position of the slide core type, and a gate. Equipment for manufacturing shaped products. 8. The apparatus according to claim 7, wherein the core material holding portion includes a magnet that attracts the core material. 9. The apparatus according to claim 7, wherein the core material holding portion includes a vacuum suction tool for suctioning the core material. 10. The apparatus according to claim 7, wherein the core material holding portion includes a protrusion protruding toward the cavity mold side along the outer peripheral edge portion of the core material to be held. 11. A resin flow path switching valve, which selectively communicates with the first resin flow path and the second resin flow path, is provided between the first resin flow path and the second resin flow path, and the switching valve is injection molded. The apparatus according to any one of claims 7 to 10, which is connected to one resin supply path on the machine side. 12. The resin flow path according to claim 7, wherein the first resin flow path and the second resin flow path are both independent and are connected to another independent resin supply path on the injection molding machine side. The device according to any of the above.