JP2012250509A - Injection molding method, injection-molded article and injection mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfy both the request of functionality and the request of appearance quality of the injection-molded article that includes a plurality of molded members formed by using different resin materials.SOLUTION: The injection-molded article is manufactured by: injecting a molten crystalline resin R1 into a first molding space formed between a fixed mold 22 including a movable insert 26 for molding and a movable mold 24 in the shape where a large cross-section space and a small cross-section space formed are consecutive; injecting a molten non-crystalline resin R2 into a second molding space formed between a fixed mold 22 including a movable insert 26 for molding moved after solidifying the molten crystalline resin R1 injected into the first molding space and the movable mold 24 in the shape enclosing other than the part consecutive to the small cross-section space out of the large cross section space; and solidifying the molten non-crystalline resin R2.

Description

  The present invention relates to an injection molded product having a portion requiring wear resistance and a portion requiring appearance quality, such as a head carriage on which an ink cartridge is installed, and an injection mold for producing the injection molded product, and The present invention relates to an injection molding method.

Conventionally, as an injection molded product formed using a plurality of different resin materials, for example, there is one disclosed in Patent Document 1.
The injection-molded article disclosed in Patent Document 1 is composed of two molded members made of different resin materials, and one molded member covers a part of the other molded member.

Japanese Patent Laid-Open No. 10-100193

However, in the technique disclosed in Patent Document 1, in order to form two types of molded members with different resin materials and to join these molded members, one molded member is a part of the other molded member. It is the composition which covers. Further, in the technique disclosed in Patent Document 1, the relationship between the resin material and the molded member is not specified.
For this reason, for example, regarding the manufacture of an injection molded product having a part that requires functionality such as wear resistance and a part that requires appearance quality such as a design, such as a head carriage on which an ink cartridge is installed, It is difficult to satisfy both requirements and appearance quality requirements.
An object of the present invention relates to an injection-molded product including a plurality of molded members formed using different resin materials, and is to satisfy both requirements for functionality and appearance quality.

  In order to solve the above problems, an injection molding method according to an aspect of the present invention is a set of molds that can be closed and opened (for example, a fixed mold 22 and a movable mold 24 in FIG. 2). ) To form a first molding space in the mold closed state between the pair of molds including a molding movable nest (for example, the molding movable nest 26 in FIG. 2) attached to at least one of the molds. One molten resin (for example, the molten crystal in FIG. 4) of the molten crystalline resin and the molten amorphous resin into the first molding space formed in one molding space forming step and the first molding space forming step. A first injection step of injecting the functional resin R1), and moving the molding movable nest after the one molten resin injected into the first molding space in the first injection step is solidified. The movable nest for molding A second molding space forming step for forming a second molding space in the closed state between the set of molds, and the crystal melted in the second molding space formed in the second molding space forming step. A second injection step of injecting the other molten resin (for example, the molten amorphous resin R2 in FIG. 6) of the crystalline resin and the molten amorphous resin, and in the first molding space forming step, Forming a first molding space having a shape in which a large cross-sectional area space and a small cross-sectional area space differing from each other when viewed from the mold closing and mold opening directions of the pair of molds, In the two molding space forming step, the second molding space having a shape surrounding the large cross-sectional area space except for a portion continuous with the small cross-sectional area space is formed.

With such a configuration, when the other molten resin injected into the second molding space is solidified, the solid resin member and the solidified other molten resin member are separated from the force in the direction of separating them. A stop will be formed.
Thus, by using a crystalline resin and an amorphous resin, which are resins having very low compatibility with each other, a member made of one solidified molten resin and a member made of the other solidified molten resin are molded. However, these members are configured to be able to suppress relative displacement of each other.

In the injection molding method according to one aspect of the present invention, in the first injection step, the molten crystalline resin is injected into the first molding space, and in the second injection step, the molten non-crystalline property is injected. A resin is injected into the second molding space, and the glass transition temperature of the amorphous resin is lower than the glass transition temperature of the crystalline resin.
With such a configuration, in the second injection step, it is possible to prevent the crystalline resin already solidified from being melted again by the heat of the molten amorphous resin injected into the second molding space. Is possible.
This makes it possible to reduce the difference between the shape dimension of the member actually molded by the solidified crystalline resin and the preset shape dimension, and the shape dimension of the actually manufactured injection-molded product and the preset shape dimension. It is possible to reduce the difference.

In the injection molding method according to one aspect of the present invention, in the first injection step, the molten amorphous resin is injected into the first molding space, and in the second injection step, the molten crystalline property is injected. A resin is injected into the second molding space, and the glass transition temperature of the crystalline resin is lower than the glass transition temperature of the amorphous resin.
With such a configuration, in the second injection step, it is possible to prevent the amorphous resin that has already been solidified from being melted again by the heat of the molten crystalline resin injected into the second molding space. Is possible.
This makes it possible to reduce the difference between the shape dimension of the member actually molded by the solidified amorphous resin and the preset shape dimension, and the shape dimension of the actually manufactured injection molded product and the preset shape. It becomes possible to reduce the difference from the dimension.

Further, the injection molding method according to one aspect of the present invention includes a temperature of the resin injected into the first molding space in the first injection step and a temperature of the resin injected into the second molding space in the second injection step. The temperature difference is 40 ° C. or more.
With such a configuration, compared with the case where the temperature difference is less than 40 ° C., the molten resin already solidified is melted again by the heat of the molten resin injected into the second molding space. Can be further prevented.
Thereby, compared with the case where said temperature difference is made into less than 40 degreeC, it becomes possible to further reduce the difference of the shape dimension of the injection molded product actually shape | molded, and the preset shape dimension.

  Moreover, the injection molded product (for example, injection molded product P of FIG. 1) which concerns on 1 aspect of this invention is the functional requirement member (for example, functionality requirement member 1 of FIG. 1) currently formed with crystalline resin. And an appearance quality requirement member (for example, appearance quality requirement member 2 in FIG. 1) formed of an amorphous resin, and one of the functional requirement member and the appearance quality requirement member is A penetration part (for example, penetration part 6 of Drawing 1) which penetrates the surface nearest to said one member in the other member among a functional requirement member and the above-mentioned appearance quality requirement member, and said other side following said penetration part An anchor portion (for example, the anchor portion 8 in FIG. 1) that fits inside the member, and a part of the anchor portion (for example, the protruding portion 8a in FIG. 1) includes the penetration portion and the anchor. The other part as seen from the direction in which the parts continue It is characterized in that the through portions are overlapped with portions not penetrate out of.

With such a configuration, even if stress is applied to the injection molded product in the direction in which the functional requirement member and the appearance quality requirement member are separated from each other, the portion where the penetrating portion does not penetrate through the other member The relative displacement between the functional requirement member and the appearance quality requirement member is suppressed by a part of the anchor portion.
As a result, even if a functional requirement member and an appearance quality requirement member are molded using a crystalline resin and an amorphous resin, which are resins having extremely low compatibility with each other, these functionality requirement member and appearance quality The request member is configured to be able to suppress relative displacement between each other.
For this reason, the bonding force between the functional requirement member formed using the crystalline resin and the appearance quality requirement member formed using the non-crystalline resin is strong, and it is possible to satisfy both the functional requirement and the appearance quality requirement. Possible injection-molded articles can be manufactured.

  An injection mold according to one embodiment of the present invention (for example, the injection mold 20 in FIG. 2) is a mold that is attached to at least one of a set of molds that can be closed and opened. One of the molten resin and the molten amorphous resin is injected between the movable mold and the set of molds including the mold movable insert in the mold closed state. A first molding space forming portion that forms a first molding space (for example, a surface facing the fixed movable opening 30 of the movable movable insert 26, the movable movable insert 28, and the movable mold 24 in FIG. 2). The crystal formed and melted in the mold closed state between the pair of molds including the molding movable nest moved after the one molten resin injected into the first molding space is solidified Resin and melted The second molding space forming portion for forming the second molding space into which the other molten resin is injected out of the non-crystalline resin (for example, the moved movable mold insert 26 in FIG. A movable insert 28), wherein one of the first molding space and the second molding space has a cross-sectional area different from each other when viewed from the mold closing and mold opening directions of the pair of molds. An area space and a small cross-sectional area space are continuous, and the other molding space of the first molding space and the second molding space is continuous with the small cross-sectional area space in the large cross-sectional area space. It is characterized by the shape surrounding the part other than the part.

With such a configuration, when the other molten resin injected into the second molding space is solidified, the solid resin member and the solidified other molten resin member are separated from the force in the direction of separating them. A stop will be formed.
Thus, by using a crystalline resin and an amorphous resin, which are resins having very low compatibility with each other, a member made of one solidified molten resin and a member made of the other solidified molten resin are molded. However, these members are configured to be able to suppress relative displacement of each other.

It is a figure which shows the structure of an injection molded product. It is a figure which shows schematic structure of an injection mold. It is a figure which shows schematic structure of an injection mold. It is a figure which shows schematic structure of the injection mold in the state which injected the molten resin to the 1st molding space in the 1st injection process. It is a figure which shows schematic structure of the injection mold in the state which formed the 2nd shaping | molding space in the 2nd shaping | molding space formation process. It is a figure which shows schematic structure of the injection mold in the state which injected the molten resin to the 2nd molding space in the 2nd injection process. It is a figure which shows schematic structure of the injection mold in the state which moved the movable nest for extraction in the extraction process. It is a figure which shows schematic structure of the injection mold in the state which made the fixed side metal mold | die and the movable side metal mold | die open state in the taking-out process. It is a figure which shows the modification of 1st embodiment of this invention. It is a figure which shows the modification of 1st embodiment of this invention. It is a figure which shows the modification of 1st embodiment of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments (embodiments) of an injection molded product, an injection mold, and an injection molding method according to the present invention will be described with reference to the drawings.
(First embodiment)
(Constitution)
(Composition of injection molded product)
First, the configuration of an injection molded product in the first embodiment will be described with reference to FIG.
FIG. 1 is a diagram showing a schematic configuration of an injection molded product P, and is a cross-sectional view of the injection molded product P.
The injection molded product P is, for example, a head carriage on which an ink cartridge is installed, and includes a functional requirement member 1 and an appearance quality requirement member 2.
The functional requirement member 1 is formed of a solidified crystalline resin, and constitutes a portion of the injection-molded product P that requires wear resistance, such as a portion that slides with other members.

In the first embodiment, as an example, the surface of the functional requirement member 1 opposite to the surface facing the appearance quality requirement member 2 (the lower surface in FIG. 1; the same applies to the following description) is injected. A case where a sliding surface between the molded product P and another member is formed will be described.
As the crystalline resin forming the functional requirement member 1, for example, POM (Polyacetal), PA (Polyamide), PPS (Polyphenylene sulfide), PP (Polypropylene), PE (Polyethylene), or the like can be used.
The crystalline resin as described above is suitable for use in sliding parts and parts that require wear resistance, and shrinkage at the time of molding (solidification) compared to the non-crystalline resin described later. It is a resin having a large ratio (hereinafter sometimes referred to as “molding shrinkage ratio”).

The functionality requesting member 1 includes a functional surface holding part 4, a penetrating part 6, and an anchor part 8.
The functional surface holding part 4 is formed in a flat plate shape, and has a sliding surface between the injection molded product P and other members of the functional requirement member 1.
The penetrating portion 6 is formed continuously on the surface (the upper surface in FIG. 1, the same as in the following description) of the functional surface possessing portion 4 that faces the appearance quality requesting member 2. Has been.
The center of the penetrating portion 6 is the same as or substantially the same as the center of the functional surface holding portion 4 when viewed from the arrangement direction of the functionality requesting member 1 and the appearance quality requesting member 2 (vertical direction in FIG. It is the same.

In addition, the penetrating portion 6 has a functional area possessing portion 4 as viewed from the arrangement direction of the functionality requesting member 1 and the appearance quality requesting member 2 in terms of the cross-sectional area viewed from the arrangement direction of the functionality requesting member 1 and the appearance quality requesting member 2. It is formed so as to be smaller than the cross sectional area.
The anchor part 8 is formed continuously with the penetrating part 6 and is continuous with the functional surface holding part 4 with the penetrating part 6 interposed therebetween.
The center of the anchor portion 8 is the same as or substantially the same as the center of the functional surface holding portion 4 and the penetrating portion 6 when viewed from the arrangement direction of the functionality requirement member 1 and the appearance quality requirement member 2.

In addition, the anchor portion 8 has a cross-sectional area as viewed from the arrangement direction of the functional requirement member 1 and the appearance quality requirement member 2, and the functional surface holding portion 4 as seen from the arrangement direction of the functionality requirement member 1 and the appearance quality requirement member 2. The cross-sectional area of the penetrating part 6 is smaller than the cross-sectional area of the penetrating portion 6 when viewed from the arrangement direction of the functional requirement member 1 and the appearance quality requirement member 2.
Thereby, the anchor part 8 has the protrusion part 8a which protrudes to the outer peripheral surface side of the functional surface holding | maintenance part 4 rather than the penetration part 6 seeing from the sequence direction of the functionality request | requirement member 1 and the external appearance quality request | requirement member 2. ing.
In the first embodiment, as an example, the configuration of the anchor portion 8 is a direction orthogonal to the arrangement direction of the functional requirement member 1 and the appearance quality requirement member 2 (in FIG. 1, the thickness direction of the paper surface. However, the case where the cross-sectional shape viewed from the above is a square will be described.

The appearance quality requesting member 2 is formed of a solidified non-crystalline resin, and constitutes a portion of the injection molded product P that requires appearance quality such as a design surface, such as a portion that is viewed by a user. .
In the first embodiment, as an example, of the appearance quality requesting member 2, the surface opposite to the surface facing the functionality requesting member 1 (the upper surface in FIG. 1; the same applies to the following description) is injection-molded. The case where the design surface of the product P is formed will be described.

As the non-crystalline resin forming the appearance quality requirement member 2, for example, ABS (acrylonitrile / butadiene / styrene copolymer synthetic resin), PS (Polystyrene), methacrylic (methacrylate) resin, or the like can be used.
The non-crystalline resin as described above is a resin having a characteristic that the molding shrinkage rate is smaller than that of the crystalline resin. In addition, the non-crystalline resin is a resin having very low compatibility with the crystalline resin, and the solidified non-crystalline resin and the solidified crystalline resin are bonded even if they are in surface contact with each other. There is very little power.

The appearance quality requesting member 2 includes a design surface holding portion 10, an anchor fitting portion 12, and a through hole portion 14.
The design surface holding part 10 is formed in a flat plate shape and has a design surface of the injection molded product P in the appearance quality requesting member 2.
The anchor fitting part 12 is a space formed inside the design surface holding part 10, and the anchor part 8 is fitted therein.

The center of the anchor fitting portion 12 is the same as or substantially the same as the center of the design surface holding portion 10 when viewed from the arrangement direction of the functional requirement member 1 and the appearance quality requirement member 2.
The through-hole portion 14 is a through-hole opened on the surface closest to the functional requirement member 1 in the appearance quality requirement member 2 (the lower surface in FIG. 1, and the same applies to the following description), and the anchor fitting portion 12. And the penetration part 6 penetrates through the inside.

Moreover, the center of the through-hole part 14 is the same as or substantially the same as the center of the design surface holding part 10 and the anchor fitting part 12 when viewed from the arrangement direction of the functional requirement member 1 and the appearance quality requirement member 2. .
Further, the through hole portion 14 has an anchor fitting portion whose cross-sectional area viewed from the arrangement direction of the functional requirement member 1 and the appearance quality requirement member 2 is viewed from the arrangement direction of the functionality requirement member 1 and the appearance quality requirement member 2. The cross-sectional area is smaller than 12.

  As described above, as shown in FIG. 1, in a state in which the through portion 6 is passed through the through hole portion 14 and the anchor portion 8 is fitted inside the anchor fitting portion 12, the through portion 6 and the anchor portion 8 are As seen from the continuous direction (vertical direction in FIG. 1; the same applies to the following description), the above-described protruding portion 8a, which is a part of the anchor portion 8, is penetrated by the penetrating portion 6 of the appearance quality requirement member 2. It overlaps with the peripheral part of the through-hole part 14 in the part which does not exist, ie, the design surface holding part 10.

  Thereby, as shown in FIG. 1, in a state where the through-hole portion 14 is passed through the through-hole portion 6 and the anchor portion 8 is fitted inside the anchor fitting portion 12, the function is performed on the injection molded product P. Even when stress in a direction in which the property requirement member 1 and the appearance quality requirement member 2 are separated, the peripheral portion of the through-hole portion 14 and the protruding portion 8a of the anchor portion 8 of the design surface holding portion 10 The relative displacement between the functionality requesting member 1 and the appearance quality requesting member 2 is suppressed.

(Configuration of injection mold)
Next, the configuration of the injection mold in the first embodiment will be described using FIG. 2 with reference to FIG.
FIG. 2 is a view showing a schematic configuration of the injection mold 20, and is a cross-sectional view of the injection mold 20.
An injection mold 20 shown in FIG. 2 is a molding space (cavity) formed between a pair of molds when a pair of molds that can be closed and opened is in a mold closed state. It is an apparatus capable of two-color molding, in which two types of molten resin are injected stepwise and solidified individually, and an injection molded product is manufactured by combining these two types of solidified molten resin. In addition, the description regarding molding space is mentioned later.

As shown in FIG. 2, the injection mold 20 includes a fixed mold 22 and a movable mold 24 as the set of molds described above. In addition to this, the injection mold 20 includes a molding movable nest 26 and a removal movable nest 28. In FIG. 2, the injection mold 20 in the mold closed state is shown.
The fixed side mold 22 is attached to a fixed plate (not shown) for holding the injection mold 20 by using bolts or the like, and a fixed side opening 30 and a molding insert are provided therein. A displacement gap 32, a take-out insert displacement gap 34, and a resin passage (not shown) are provided.

The fixed side opening 30 is a space filled with a molten resin, and opens to a surface (a lower surface in FIG. 2) of the fixed side mold 22 that faces the movable side mold 24.
The forming insert displacement gap portion 32 is a space in which the forming movable insert 26 can be disposed, and is a space in which the forming movable insert 26 disposed therein can be moved, and is continuous with the fixed side opening 30. is doing.
The take-out nest displacement gap 34 is a space in which the take-out movable nest 28 can be disposed, and is a space in which the take-out movable nest 28 can be moved, and is continuous with the fixed-side opening 30. is doing.

The resin passage is formed so that the molten resin can pass therethrough. Further, one end side of the resin passage opens into the fixed side opening 30 and the other end side of the resin passage communicates with a resin injection device (not shown). In the first embodiment, as an example, a case where a movable nozzle is provided on one end side of the resin passage will be described. For example, the nozzle is arranged in the molding movable nest 26 so as to be movable together with the molding movable nest 26.
The resin injection device measures and plasticizes resin materials (solid resin materials, etc.) of crystalline resin or non-crystalline resin according to the volume and shape of the injection-molded product, and this measured and plasticized molten resin It is a device that injects into the resin passage.

The fixed mold 22 has an ejector pin (not shown) that can protrude into the fixed opening 30. The state that this ejector pin does not protrude into the fixed side opening 30 is a normal state.
In addition, as a specific configuration example for driving the ejector pin, for example, an upper plate material provided with an ejector pin and a known return pin, and a lower plate material for pressing and fixing the ejector pin and the return pin are used. There is a configuration provided. In this case, an ejector pin is protruded into the fixed side opening 30 by a known ejector device included in the injection mold 20 and the injection molded product solidified in the fixed side opening 30 is taken out.

  The movable side mold 24 is connected to a drive mechanism (not shown), and the driving force generated by the drive mechanism is used to close and open the mold between the fixed side mold 22 and the movable side mold 24 (see FIG. 2 is formed so as to be movable in the vertical direction in the same way in the following description. The drive mechanism includes, for example, a mechanical type using a rotational motion of a motor and a hydraulic type that applies pressure to a liquid such as oil.

The molding movable nest 26 is formed in a shape and dimension corresponding to the appearance quality requirement member 2 in the injection molded product P, and is movably disposed in the molding nest displacement gap 32. Here, the moving direction of the molding movable insert 26 in the molding insert displacement gap 32 is a direction approaching the fixed side opening 30 and a direction away from the fixed side opening 30.
In addition, the shaping | molding movable nest | insert 26 moves by the drive of a nesting drive part (not shown), for example. Here, the nesting drive unit is formed using, for example, an air cylinder, a hydraulic cylinder, a motor, or the like, and is built in the fixed-side mold 22. In addition, the structure of the nesting drive part is good also as a structure attached to the outer surface of the fixed side metal mold | die 22. FIG.

  Further, the driving of the nesting drive unit is performed by, for example, a nesting drive control unit (not shown). Here, in the nesting drive control unit, a molten resin corresponding to the physical properties (glass transition point, etc.) of the resin material of the crystalline resin and the amorphous resin and the shape dimension (wall thickness, etc.) of the injection molded product in advance. The amount of movement of the movable mold nest 26 is stored in accordance with the solidification completion time required for cooling to complete the internal solidification and the shape and size of the functional requirement member 1 and the appearance quality requirement member 2.

The molding movable nest 26 specifically includes a first molding part 26a, a second molding part 26b, and a third molding part 26c.
The first molding part 26a is formed with a shape and dimension corresponding to the outer peripheral side of the through-hole part 14 in the appearance quality requirement member 2, and the mold closing and mold opening between the fixed mold 22 and the movable mold 24 are performed. It is divided along the direction. In the first embodiment, as an example, the first molding portion 26 a is located in the vicinity of the center of the fixed mold 22 along the mold closing and mold opening directions of the fixed mold 22 and the movable mold 24. The case where it is divided into two will be described. That is, the divided first molding portions 26a are formed in a substantially U-shape when viewed from the mold closing and mold opening directions of the fixed mold 22 and the movable mold 24, respectively.

Further, the divided first molding portion 26a has a moving direction perpendicular to the mold closing and mold opening directions of the fixed mold 22 and the movable mold 24 (the horizontal direction in FIG. 2). The same applies to the following description). Note that FIG. 2 shows a state in which the divided first molding portions 26 a are moved to positions closest to the fixed-side opening 30.
Accordingly, the molding nesting displacement gap portion 32 has a first gap portion 32a, which is a space in which the first molding portion 26a is disposed. The shape dimension of the 1st space | gap part 32a is set so that the whole 1st shaping | molding part 26a can be accommodated.

  The second molding portion 26b is formed with a shape and dimension corresponding to the outer peripheral side of the anchor fitting portion 12 in the appearance quality requesting member 2, and, like the first molding portion 26a, the fixed side mold 22 and the movable side mold. The mold 24 is divided along the mold closing and mold opening directions. In the first embodiment, as an example, the second molding portion 26b is located in the vicinity of the center of the fixed mold 22 along the mold closing and mold opening directions of the fixed mold 22 and the movable mold 24. The case where it is divided into two will be described. That is, each of the divided second molding portions 26b is formed in a substantially U-shape when viewed from the mold closing and mold opening directions of the fixed mold 22 and the movable mold 24.

Moreover, the movement direction of the divided | segmented 2nd shaping | molding part 26b is set to the direction orthogonal to the mold closing and mold opening direction of the stationary mold 22 and the movable mold 24, respectively. Note that FIG. 2 shows a state where the divided second molding portions 26 b have moved to positions closest to the fixed-side opening 30.
Accordingly, the molding nesting displacement gap portion 32 has a second gap portion 32b, which is a space in which the second molding portion 26b is disposed. The shape dimension of the 2nd space | gap part 32b is set so that the 2nd shaping | molding part 26b whole can be accommodated.
The third molded portion 26c is formed in a shape corresponding to the remaining portion of the appearance quality requesting member 2, and is formed in a flat plate shape.

Further, the moving direction of the third molding portion 26c is set in the mold closing and opening directions of the fixed mold 22 and the movable mold 24. 2 shows a state in which the third molding portion 26c has moved to a position closest to the fixed-side opening 30.
Accordingly, the molding nesting displacement gap 32 has a third gap 32c, which is a space in which the third molding 26c is disposed. The shape dimension of the 3rd space | gap part 32c is set so that the 3rd shaping | molding part 26c whole can be accommodated.
The take-out movable insert 28 has a shape dimension corresponding to the functional requirement member 1 of the injection-molded product P, specifically, a portion having a plane corresponding to the outer peripheral surface of the functional surface holding portion 4, and this plane. It is formed by a portion having a protruding portion corresponding to a portion of the through portion 6 that is not disposed in the through hole portion 14 and protrudes from the portion having the fixed side opening portion 30.

Further, the movable movable insert 28 is disposed so as to be movable into the clearance for nesting displacement 34 for the take-out. Here, the moving direction of the removal movable insert 28 in the removal insert displacement gap 34 is a direction approaching the fixed side opening 30 and a direction away from the fixed side opening 30.
The take-out movable nest 28 moves, for example, by driving of a nest drive unit, like the movable nest 26 for molding. Further, the driving of the nesting drive unit is performed by, for example, the nesting drive control unit, similarly to the molding movable nesting 26. Here, the movement amount of the movable movable insert 28 corresponding to the shape and size of the injection molded product P is stored in advance in the insert drive control unit.

The take-out movable insert 28 is divided along the mold closing and mold opening directions of the fixed mold 22 and the movable mold 24. In the first embodiment, as an example, the movable movable insert 28 is disposed in the vicinity of the center of the fixed mold 22 along the mold closing and mold opening directions of the fixed mold 22 and the movable mold 24. The case where it is divided into two will be described. That is, the divided movable inserts 28 for removal are formed in a substantially U-shape when viewed from the mold closing and mold opening directions of the fixed mold 22 and the movable mold 24.
Further, the divided movable inserts 28 are set so that the moving directions thereof are orthogonal to the mold closing and mold opening directions of the fixed mold 22 and the movable mold 24. FIG. 2 shows a state where the divided movable movable inserts 28 are moved to positions closest to the fixed side opening 30.

Here, as shown in FIG. 2, the divided first molded portion 26a, the divided second molded portion 26b, the third molded portion 26c and the divided movable movable insert 28 are In a state in which each of them is moved to the position closest to the fixed side opening 30, the surface facing the fixed side opening 30 of the movable mold insert 26, the movable move insert 28 and the movable mold 24 is the first molding. The 1st shaping | molding space formation part which forms space is comprised.
Therefore, the injection mold 20 of the first embodiment is formed between the fixed mold 22 including the molding movable insert 26 and the movable mold 24 in the mold closed state, and melts the crystalline resin and the molten resin. A first molding space forming part for forming a first molding space into which one molten resin of the non-crystalline resin is injected is provided.

The shape of the first molding space is such that the large cross-sectional area space and the small cross-sectional area space are continuously different from each other in cross-sectional area when viewed from the mold closing and mold opening directions of the fixed side mold 22 and the movable side mold 24. Shape.
Here, the large cross-sectional area space is a space having a shape corresponding to the anchor portion 8 and the anchor fitting portion 12, and the small cross-sectional area space is a space having a shape and size corresponding to the penetrating portion 6. Further, in the first molding space, the remaining part other than the large cross-sectional area space and the small cross-sectional area space is a space having a shape corresponding to the functional surface holding portion 4.
Therefore, the shape of the first molding space is a shape corresponding to the functional surface holding portion 4, the penetrating portion 6 and the anchor portion 8, that is, a shape corresponding to the functionality requesting member 1.

Further, after the molten resin injected into the first molding space is solidified, the nesting drive control unit drives the nesting driving unit to move the molding movable nesting 26 in a direction away from the fixed side opening 30.
In this case, as shown in FIG. 3, the divided first molded portion 26a, the divided second molded portion 26b, and the third molded portion 26c are separated from the fixed opening 30, respectively. In the state of having moved to (2), the moved movable molding insert 26 and the unmovable movable movable insert 28 constitute a second molding space forming portion that forms the second molding space. FIG. 3 is a diagram showing a schematic configuration of the injection mold 20, and is a cross-sectional view of the injection mold 20.

  Therefore, the injection mold 20 of the first embodiment includes a fixed mold 22 and a movable mold 24 that include a movable mold insert 26 that is moved after the molten resin injected into the first molding space is solidified. And a second molding space forming part that forms a second molding space in which the other molten resin out of the molten crystalline resin and molten amorphous resin is injected.

The shape of the second molding space is a shape that surrounds the above-described large cross-sectional area space other than the portion that is continuous with the above-described small cross-sectional area space. That is, the shape of the second molding space is such that the divided first molded portion 26a, the divided second molded portion 26b, the third molded portion 26c, and the divided movable movable insert 28 are respectively The shape is the same as the shape of the molding movable nest 26 in a state where it is moved to the position closest to the fixed side opening 30 (see FIG. 2).
Therefore, the shape of the second molding space is a shape corresponding to the design surface holding portion 10, the anchor fitting portion 12 and the through hole portion 14, that is, a shape corresponding to the appearance quality requesting member 2.

(Injection molding method)
Next, a process for manufacturing an injection-molded product using the injection mold 20 having the above-described configuration will be described with reference to FIGS. 1 to 3 and FIGS. 4 to 8.
In the first embodiment, when manufacturing an injection molded product, a first molding space forming step, a first injection step, a first pressure holding step, a first cooling step, a second molding space forming step, An injection molding method including a second injection step, a second pressure holding step, a second cooling step, and a removal step is used.

(First molding space formation process)
Hereinafter, the operation of the injection mold 20 in the first molding space forming step will be described. In the following description, it is assumed that a set of molds that can be closed and opened, that is, a state where the fixed mold 22 and the movable mold 24 are in the mold open state.
In the first molding space forming step, a first molding space is formed between the fixed mold 22 including the molding movable nest 26 and the movable mold 24 in the mold closed state.
Specifically, first, the movable mold 24 is moved to the fixed mold 22 side, and the movable mold 24 and the fixed mold 22 are brought into contact with each other, as shown in FIG. The mold 22 and the movable mold 24 are closed.

At this time, the nesting drive control unit drives the nesting driving unit to divide the first molded portion 26a, the divided second molded portion 26b, the third molded portion 26c, and the divided take-out. Each of the movable movable inserts 28 is moved to a position closest to the fixed side opening 30 (see FIG. 2).
Thus, the first molding space, which is a space corresponding to the functionality requesting member 1, by a surface facing the molding movable insert 26, the removal movable insert 28 and the fixed side opening 30 of the movable mold 24, That is, the first molding having a shape in which the large cross-sectional area space and the small cross-sectional area space are continuous, the cross-sectional areas of the fixed side mold 22 and the movable side mold 24 being different from each other when viewed from the mold closing and mold opening directions A space is formed and the first molding space forming step is completed.

(First injection process, first pressure holding process and first cooling process)
Hereinafter, the operation of the injection mold 20 in the first injection process, the first pressure holding process, and the first cooling process will be described.
In the first injection step, one of the molten crystalline resin and the molten amorphous resin is injected into the first molding space formed in the first molding space forming step.
Here, in 1st embodiment, the case where the molten crystalline resin is inject | emitted to the 1st shaping | molding space formed at the 1st shaping | molding space formation process as an example is demonstrated.
Specifically, as shown in FIG. 4, a crystalline resin melted by weighing and plasticizing into the first molding space formed in the first molding space forming step (in the following description and drawings, “molten crystal”). In some cases, the resin may be described as “resin R1” ”, the first injection process is terminated, and the process proceeds to the first pressure holding process. FIG. 4 is a diagram showing a schematic configuration of the injection mold 20 in a state where molten resin is injected into the first molding space in the first injection step, and is a cross-sectional view of the injection mold 20.

In the first pressure-holding step, the positions of the movable side mold 24, the molding movable insert 26 and the removal movable insert 28 are held, and in the first molding space, the molten crystalline resin R1 injected in the first injection step is The pressure is maintained over a preset time (see FIG. 4). After finishing the first pressure holding process, the process proceeds to the first cooling process.
In the first cooling step, the molten crystalline resin R1 injected into the first molding space in the first injection / first pressure holding step is heat exchanged between the fixed side mold 22 and the movable side mold 24. Cool and solidify (see FIG. 4).
When the molten crystalline resin R1 injected into the first molding space is solidified, the functional surface possessing part 4, the penetrating part 6 and the anchor part 8 are molded, and the functional requirement member 1 is molded.

Further, sink marks are generated in the molten crystalline resin R1 whose surface and inside are solidified as described above, due to shrinkage that occurs when the internal solidification proceeds.
Here, as described above, since the crystalline resin has a higher molding shrinkage rate than the non-crystalline resin, sink marks generated when the molten crystalline resin R1 is solidified are different from those in the first embodiment. As compared with the case where a molten amorphous resin is used as the molten resin to be injected into the first molding space, it becomes larger.

(Second molding space formation process)
Hereinafter, the operation of the injection mold 20 in the second molding space forming step will be described.
In the second molding space forming step, after the molten crystalline resin R1 injected into the first molding space in the first injection step is solidified, the molding movable nest 26 is moved, and the moved molding movable nest 26 is moved. A second molding space is formed between the fixed side mold 22 including the movable side mold 24 and the movable side mold 24 in the mold closed state.
More specifically, after the molten crystalline resin R1 injected into the first molding space in the first injection step completes the solidification of the surface and the inside, the movable nesting 26 is moved to complete the solidification. The resin R1 and the molding movable nest 26 are separated.

At this time, the nesting drive control unit drives the nesting driving unit to move to the position closest to the fixed side opening 30, and the first molding unit 26a, the second molding unit 26b, and the third molding unit. Each 26c is moved in the direction away from the fixed side opening 30 (see FIG. 3). That is, the first molding part 26a and the second molding part 26b are respectively divided and moved.
As a result, as shown in FIG. 5, the second molding space, which is a space corresponding to the appearance quality requirement member 2, is formed by the moved movable mold insert 26 and the unmovable movable insert 28. The second molding space forming step is completed by forming a second molding space having a shape that surrounds a portion of the large sectional area other than the portion that is continuous with the small sectional area. FIG. 5 is a diagram showing a schematic configuration of the injection mold 20 in a state where the second molding space is formed in the second molding space forming step, and is a cross-sectional view of the injection mold 20.

(Second injection step, second pressure holding step and second cooling step)
Hereinafter, the operation of the injection mold 20 in the second injection process, the second pressure holding process, and the second cooling process will be described.
In the second injection step, one of the molten crystalline resin and the molten amorphous resin is injected into the second molding space formed in the second molding space forming step.
Here, in the first embodiment, as described above, as an example, the molten crystalline resin is injected into the first molding space. For this reason, in the first embodiment, the molten amorphous resin is injected into the second molding space formed in the second molding space forming step.

  Specifically, as shown in FIG. 6, an amorphous resin (measured and plasticized in the following description and drawings, “molten” is melted into the second molding space formed in the second molding space forming step. May be described as “non-crystalline resin R2”). FIG. 6 is a diagram showing a schematic configuration of the injection mold 20 in a state where molten resin is injected into the second molding space in the second injection step, and is a cross-sectional view of the injection mold 20.

Here, in the first embodiment, as an example, the non-crystalline resin forming the molten non-crystalline resin R2 has a glass transition temperature of the crystalline resin forming the molten crystalline resin R1. A case where the resin is lower than that will be described.
Therefore, in the second injection step, the molten crystalline resin R1 that has already been solidified is prevented from being melted again by the heat of the molten amorphous resin R2 injected into the second molding space.

In the first embodiment, as an example, the temperature of the molten amorphous resin R2 injected into the second molding space is set to be higher than the temperature of the molten crystalline resin R1 injected into the first molding space in the first injection step. A case where a low temperature is set with a temperature difference of 40 ° C. or more will be described. Thereby, in the first embodiment, the temperature difference between the temperature of the resin injected into the first molding space in the first injection process and the temperature of the resin injected into the second molding space in the second injection process is 40 [° C.]. That's it.
Therefore, in the second injection step, the temperature of the molten crystalline resin R1 injected into the first molding space in the first injection step and the temperature of the molten amorphous resin R2 injected into the second molding space in the second injection step Compared with the case where the temperature difference is less than 40 [° C.], it is further prevented that the molten crystalline resin R1 in the already solidified state is melted again by the heat of the molten amorphous resin R2. ing.

In addition, as described above, the crystalline resin forming the molten crystalline resin R1 injected into the first molding space in the first injection step has a higher molding shrinkage ratio than the non-crystalline resin. Sinks generated in the molten crystalline resin R1 cooled and solidified in the process are large.
For this reason, in the second injection step, when the molten amorphous resin R2 is injected into the second molding space, out of the large sink marks generated in the molten crystalline resin R1 in the solidified state, The melted amorphous resin R2 is filled into the sink marks generated in the facing portion.

When the molten amorphous resin R2 is injected into the second molding space, the second injection process is terminated and the process proceeds to the second pressure holding process.
In the second pressure-holding step, the positions of the movable mold 24, the molding movable insert 26, and the removal movable insert 28 are maintained, and the molten amorphous resin R2 injected in the second injection step is discharged in the second molding space. The pressure is maintained over a preset time (see FIG. 6). After finishing the second pressure holding step, the process proceeds to the second cooling step.

In the second cooling step, the fixed amorphous metal including the molding movable insert 26 and the removal movable insert 28 is used for the molten amorphous resin R2 injected into the second molding space in the second injection / second pressure holding step. It is cooled and solidified by heat exchange with the mold 22 (see FIG. 6).
When the molten amorphous resin R2 injected into the second molding space is solidified, the design surface holding portion 10, the anchor fitting portion 12, and the through hole portion 14 are molded, and the appearance quality requirement member 2 is molded. That is, when the molten amorphous resin R2 injected into the second molding space is solidified, as shown in FIG. 6, a portion of the anchor portion 8 included in the functional requirement member 1 that is continuous with the penetrating portion 6. The external appearance quality request | requirement member 2 of the shape which surrounds except is formed.

Thereby, since the appearance quality request | requirement member 2 is shape | molded in the state which the anchor part 8 fitted in the anchor fitting part 12, among the protrusion part 8a of the anchor part 8, and the through-hole part 14, the penetration part 6 And a portion that overlaps the protruding portion 8a when viewed from the direction in which the anchor portion 8 continues, and a retaining portion for a force in a direction in which the functional requirement member 1 and the appearance quality requirement member 2 are separated from each other is formed. Become.
For this reason, as described above, a crystalline resin and an amorphous resin, which are very low in compatibility with each other and have a very low bonding force even in a state of being in surface contact with each other in a solidified state. Even if the functional requirement member 1 and the appearance quality requirement member 2 are formed using the above, the functionality requirement member 1 and the appearance quality requirement member 2 are configured to be able to suppress relative displacement between each other.

In addition, as described above, since the non-crystalline resin has a smaller molding shrinkage rate than the crystalline resin, sink marks generated when the molten non-crystalline resin R2 is solidified are obtained from the molten crystalline resin R1. Compared to sink marks generated when solidifying, it becomes small.
That is, the appearance quality requirement member 2 of the injection-molded product P formed of the solidified molten amorphous resin R2 has a sink mark depression formed by solidification in the functional requirement member 1 in the first cooling step. It is smaller than the amount of depression of the formed sync mark. For this reason, the surface accuracy of the appearance quality requirement member 2 is higher than the surface accuracy of the functionality requirement member 1.
The “sink mark” is a shallow depression formed on the surface of the solidified molten resin, and local internal shrinkage that occurs as the molten resin injected into the molding space is cooled. Therefore, the surface of the solidified molten resin is formed by the depression.

Further, as described above, in the second injection process, out of the large sink marks generated in the molten crystalline resin R1 in the solidified state, the sink marks generated in the portion facing the second molding space. Is filled with molten amorphous resin R2.
For this reason, when the molten amorphous resin R2 is solidified in the second cooling step, in addition to the portion of the molten amorphous resin R2 that has been injected into the second molding space and solidified, the molten crystallinity in a state where the solidification has been completed. Of the large sink marks generated in the resin R1, the portion filled into the sink marks generated in the part facing the second molding space and solidified is also in a state where the sink marks generated due to the solidification are small. It will solidify.
Thereby, when the solidification of the molten amorphous resin R2 is completed in the second cooling step, the sink marks are small in the whole injection-molded product P, and the shape dimensions of the actually manufactured injection-molded product P and the preset shape dimensions are This difference can be reduced.

(Removal process)
Hereinafter, the operation of the injection mold 20 in the removal process will be described.
In the take-out process, first, the nest drive controller is driven by the nest drive controller, and the take-out movable nest 28 moving to the position closest to the fixed side opening 30 is fixed as shown in FIG. Each of them is divided and moved in a direction away from the side opening 30. FIG. 7 is a view showing a schematic configuration of the injection mold 20 in a state where the movable movable insert 28 is moved in the extraction process, and is a cross-sectional view of the injection mold 20.

Specifically, the removal movable nest 28 is moved, and the portion of the removal movable nest 28 having the above-described protruding portion is closed and opened between the fixed mold 22 and the movable mold 24. Move to a position where it does not overlap with the injection molded product. In FIG. 7, an injection molded product formed by the solidified molten crystalline resin R1 and molten amorphous resin R2 is shown with a reference “P”.
Thus, a space in which the injection molded product P can move is formed in the fixed-side mold 22 by the moved movable insert 28 that has been moved.

Next, the movable side mold 24 is moved in a direction away from the fixed side mold 22 with respect to the fixed side mold 22 and the movable side mold 24 in the mold closed state, and as shown in FIG. The mold 24 and the fixed side mold 22 are separated from each other, and the fixed side mold 22 and the movable side mold 24 are in the mold open state. FIG. 8 is a diagram showing a schematic configuration of the injection mold 20 in a state in which the fixed mold 22 and the movable mold 24 are opened in the take-out process, and a cross section of the injection mold 20 FIG.
Then, after the fixed side mold 22 and the movable side mold 24 are in the mold open state, the ejector pin is protruded into the fixed side opening 30 and the inside of the fixed side opening 30 (the first molding space and the second molding). The injection molded product P solidified in the space) is taken out, and the production of the injection molded product P is completed.

By the above, if it is the injection molding method of the first embodiment, in the first injection step, the molten crystalline resin R1 is injected into the first molding space having a shape in which the large cross-sectional area space and the small cross-sectional area space are continuous. To do. In addition to this, after the molten crystalline resin R1 is solidified, in the second injection step, it is melted into the second molding space having a shape surrounding the large cross-sectional area other than the portion continuous with the small cross-sectional area space. Resin R2 is injected.
Thus, when the molten amorphous resin R2 injected into the second molding space is solidified, a retaining portion for a force in a direction in which the functional requirement member 1 and the appearance quality requirement member 2 are separated is formed. .

As a result, the functional requirement member 1 which is a solidified molten crystalline resin R1 and a solidified molten amorphous resin R2 using a crystalline resin and an amorphous resin which are resins having very low compatibility with each other. Even if the appearance quality requesting member 2 is formed, the functionality requesting member 1 and the appearance quality requesting member 2 are configured to be able to suppress relative displacement of each other.
Therefore, even if a crystalline resin and an amorphous resin, which are resins having very low compatibility with each other, are used, the functional requirement member 1 formed using the crystalline resin and the amorphous resin are used. It is possible to manufacture an injection-molded product P that has a strong bonding force with the appearance quality requesting member 2 and can satisfy both requirements for functionality and appearance quality.

Further, in the injection molding method of the first embodiment, in the first injection process, the molten crystalline resin R1 is injected into the first molding space, and in the second injection process, the glass transition temperature is higher than that of the crystalline resin. A molten amorphous resin R2 obtained by melting a low amorphous resin is injected into the second molding space.
Thereby, in the second injection step, it is possible to prevent the molten crystalline resin R1 that has already been solidified from being melted again by the heat of the molten amorphous resin R2 injected into the second molding space. It becomes.
For this reason, it becomes possible to reduce the difference between the shape dimension of the functional requirement member 1 actually molded and the preset shape dimension, and the shape dimension of the actually manufactured injection-molded product P and the preset dimension Therefore, it is possible to suppress the shape of the injection molded product P from changing from a preset shape.

Further, in the case of the injection molding method of the first embodiment, the temperature of the molten crystalline resin R1 injected into the first molding space in the first injection process and the molten amorphous property injected into the second molding space in the second injection process. The temperature difference from the temperature of the resin R2 is set to 40 [° C.] or more.
Thereby, compared with the case where the temperature difference is less than 40 [° C.], the molten crystalline resin R1 in the already solidified state is melted again by the heat of the molten amorphous resin R2. Further prevention can be achieved.
For this reason, compared with the case where said temperature difference is made into less than 40 [degreeC], the difference of the shape dimension of the functional request | requirement member 1 actually shape | molded and the preset shape dimension can further be reduced. It becomes.

Further, as described above, in the injection molded product P of the first embodiment, the protruding portion 8a which is a part of the anchor portion 8 is a design surface holding portion when viewed from the direction in which the through portion 6 and the anchor portion 8 are continuous. 10 overlaps with the peripheral portion of the through-hole portion 14.
Thereby, even if it is a case where the stress to the direction which the functional requirement member 1 and the external appearance quality requirement member 2 leave | separate is added with respect to the injection molded product P, the periphery of the through-hole part 14 among the design surface holding | maintenance parts 10 The relative displacement between the functional requirement member 1 and the appearance quality requirement member 2 is suppressed by the portion and the protruding portion 8 a of the anchor portion 8.

As a result, even if the functional requirement member 1 and the appearance quality requirement member 2 are formed using a crystalline resin and an amorphous resin, which are resins having very low compatibility, these functionality requirement members 1 And the external appearance quality request | requirement member 2 becomes a structure which can suppress a mutual relative displacement.
Therefore, the bonding force between the functional requirement member 1 formed using the crystalline resin and the appearance quality requirement member 2 formed using the non-crystalline resin is strong, and both the requirement for functionality and the requirement for appearance quality are compatible. It is possible to manufacture an injection molded product P that can be used.

In addition, as described above, in the case of the injection mold 20 of the first embodiment, the first molding space formed by the first molding space forming unit is such that the large cross-sectional area space and the small cross-sectional area space are continuous. Shape. In addition to this, the second molding space formed by the second molding space forming portion has a shape surrounding a portion of the large cross-sectional area other than the portion continuous with the small cross-sectional area.
Thus, when the molten amorphous resin R2 injected into the second molding space is solidified, a retaining portion for a force in a direction in which the functional requirement member 1 and the appearance quality requirement member 2 are separated is formed. .

As a result, the functional requirement member 1 which is a solidified molten crystalline resin R1 and a solidified molten amorphous resin R2 using a crystalline resin and an amorphous resin which are resins having very low compatibility with each other. Even if the appearance quality requesting member 2 is formed, the functionality requesting member 1 and the appearance quality requesting member 2 are configured to be able to suppress relative displacement of each other.
For this reason, even if the structure of the injection mold 20 uses a crystalline resin and a non-crystalline resin which are resins having very low compatibility with each other, the functional requirement member 1 formed using the crystalline resin Structure capable of producing an injection molded product P that has a strong bonding force with the appearance quality requirement member 2 formed using an amorphous resin, and can satisfy both the requirements for functionality and appearance quality. It becomes.

In the first embodiment, the functional requirement member 1 and the appearance quality requirement member are manufactured by integrally molding the functionality requirement member 1 and the appearance quality requirement member 2 by two-color molding. As compared with the case where the injection molded product P is manufactured by combining these molded members, the manufacturing process can be simplified and rationalized.
Thereby, in 1st embodiment, compared with the case where the functional request | requirement member 1 and the external appearance quality request | requirement member 2 are shape | molded separately, and these molded members are combined and manufacturing the injection molded product P, it is injection molding. The production cost of the product P can be reduced.

In the first embodiment, since the injection molded product P is manufactured by two-color molding, for example, the manufacturing process is simplified and rationalized as compared with the case of manufacturing the injection molded product P by insert molding. Is possible.
Thereby, in 1st embodiment, compared with the case where the injection molded product P is manufactured by insert molding, it becomes possible to reduce the manufacturing cost of the injection molded product P, for example.

(Modification)
Hereinafter, modifications of the first embodiment will be listed.
In the first embodiment, the molten resin injected into the first molding space is the molten crystalline resin R1, and the molten resin injected into the second molding space is the molten amorphous resin R2. However, the present invention is not limited to this. Alternatively, the molten resin injected into the first molding space may be the molten amorphous resin R2, and the molten resin injected into the second molding space may be the molten crystalline resin R1.
In this case, the crystalline resin that forms the molten crystalline resin R1 is a resin whose glass transition temperature is lower than the glass transition temperature of the amorphous resin that forms the molten amorphous resin R2.

Thus, when the molten resin injected into the first molding space is the molten amorphous resin R2, and the molten resin injected into the second molding space is the molten crystalline resin R1, the second molding is performed in the second injection step. It is possible to prevent the molten amorphous resin R2 that has already been solidified from being melted again by the heat of the molten crystalline resin R1 injected into the space.
For this reason, it becomes possible to reduce the difference between the shape dimension of the appearance quality requirement member 2 actually molded and the preset shape dimension, and the shape dimension of the actually manufactured injection molded product P and the preset shape dimension Therefore, it is possible to suppress the shape of the injection molded product P from changing from a preset shape.

  Moreover, in 1st embodiment, although the structure of the anchor part 8 was set as the structure whose cross-sectional shape seen from the direction orthogonal to the sequence direction of the functional requirement member 1 and the external appearance quality requirement member 2 is a square, It is not limited. That is, for example, as shown in FIG. 9, the anchor portion 8 is configured in a direction perpendicular to the arrangement direction of the functional requirement member 1 and the appearance quality requirement member 2 (in FIG. 9, the thickness direction of the paper. The cross-sectional shape seen from the description may be circular. FIG. 9 is a diagram showing a modification of the first embodiment.

  Similarly, for example, as shown in FIG. 10, the anchor portion 8 is configured in a direction perpendicular to the arrangement direction of the functional requirement member 1 and the appearance quality requirement member 2 (in FIG. 10, the thickness direction of the paper surface. It is also possible to adopt a configuration in which the cross-sectional shape seen from the above description is a triangle. In addition, FIG. 10 is a figure which shows the modification of 1st embodiment. Although not particularly illustrated, the configuration of the anchor portion 8 may be a configuration in which the cross-sectional shape viewed from a direction orthogonal to the arrangement direction of the functionality requesting member 1 and the appearance quality requesting member 2 is a pentagon or more polygon.

  Moreover, in 1st embodiment, although the functional requirement member 1 was equipped with the penetration part 6 and the anchor part 8, and the external appearance quality requirement member 2 was equipped with the anchor fitting part 12 and the through-hole part 14, However, the present invention is not limited to this. That is, for example, as shown in FIG. 11, the appearance quality requirement member 2 includes a through portion 6 and an anchor portion 8, and the functionality requirement member 1 includes an anchor fitting portion 12 and a through hole portion 14. Also good. In addition, FIG. 11 is a figure which shows the modification of 1st embodiment.

Further, in the first embodiment, the injection molded product P is manufactured by moving the molding movable nest 26 within the fixed mold 22 (die slide method), but the present invention is not limited to this. That is, for example, the injection molded product P may be manufactured by an insert method or rotation.
In the first embodiment, the movable mold 26 for molding and the movable insert 28 for removal are attached to the fixed mold 22. However, the present invention is not limited to this. It is good also as a structure to which the movable nest 26 for shaping | molding and the movable nest 28 for taking out are attached. Further, a movable movable insert 26 and a movable movable insert 28 may be attached to the fixed mold 22 and the movable mold 24, respectively.

DESCRIPTION OF SYMBOLS 1 Functional requirement member, 2 Appearance quality requirement member, 4 Functional surface possession part, 6 Penetration part, 8 Anchor part, 8a Projection part, 10 Design surface possession part, 12 Anchor fitting part, 14 Through-hole part, 20 Injection molding Die, 22 Fixed side mold, 24 Movable side mold, 26 Molding movable nest, 26a First molding part, 26b Second molding part, 26c Third molding part, 28 Removal movable nest, 30 Fixed side opening , 32 Molding insert displacement gap, 32a First gap, 32b Second gap, 32c Third gap, 34 Depth insert displacement gap, P Injection molded product, R1 Molten crystalline resin, R2 Melting Amorphous resin

Claims (6)

A first molding space is formed in the mold-closed state between the set of molds including a molding movable nest attached to at least one of the set of molds that can be closed and opened. A molding space forming step;
A first injection step of injecting one of the molten crystalline resin and the molten amorphous resin into the first molding space formed in the first molding space forming step;
In the first injection step, after the one molten resin injected into the first molding space is solidified, the molding movable nest is moved, and the set of gold including the moved molding movable nest is moved. A second molding space forming step of forming a second molding space in the mold closed state between the molds;
A second injection step of injecting the other molten resin of the molten crystalline resin and the molten amorphous resin into the second molding space formed in the second molding space forming step,
In the first forming space forming step, the first shape having a shape in which a large cross-sectional area and a small cross-sectional area having different cross-sectional areas when viewed from the mold closing and mold opening directions of the pair of molds are continuous. Forming a molding space,
In the second molding space forming step, the second molding space having a shape that surrounds a portion of the large cross-sectional area space other than a portion continuous with the small cross-sectional area space is formed. In the first injection step, the molten crystalline resin is injected into the first molding space,
In the second injection step, the molten amorphous resin is injected into the second molding space,
The injection molding method according to claim 1, wherein the glass transition temperature of the non-crystalline resin is lower than the glass transition temperature of the crystalline resin. In the first injection step, the molten amorphous resin is injected into the first molding space,
In the second injection step, the molten crystalline resin is injected into the second molding space,
The injection molding method according to claim 1, wherein the glass transition temperature of the crystalline resin is lower than the glass transition temperature of the non-crystalline resin.   The temperature difference between the temperature of the resin injected into the first molding space in the first injection step and the temperature of the resin injected into the second molding space in the second injection step is set to 40 ° C. or more. The injection molding method according to claim 2 or 3. A functional requirement member formed of a crystalline resin, and an appearance quality requirement member formed of an amorphous resin,
One member of the functional requirement member and the appearance quality requirement member is a through portion penetrating through the surface closest to the one member in the other member of the functionality requirement member and the appearance quality requirement member, An anchor portion that fits into the other member continuously with the penetrating portion,
An injection molded product characterized in that a part of the anchor portion overlaps a portion of the other member where the penetration portion does not penetrate as seen from a direction in which the penetration portion and the anchor portion are continuous. . A movable mold nest attached to at least one of a set of molds capable of mold closing and mold opening;
A first molding space formed between the set of molds including the molding movable nest in the mold-closed state and into which one of the molten crystalline resin and the molten amorphous resin is injected. A first molding space forming part for forming,
The crystallinity formed in the mold closed state and melted between the set of molds including the movable mold nest moved after the one molten resin injected into the first molding space is solidified A second molding space forming part that forms a second molding space in which the other molten resin of the resin and the molten amorphous resin is injected,
One molding space of the first molding space and the second molding space has a large cross-sectional area space and a small cross-sectional area space that have different cross-sectional areas when viewed from the mold closing and mold opening directions of the pair of molds. A continuous shape,
Injection molding, wherein the other molding space of the first molding space and the second molding space has a shape surrounding a portion of the large cross-sectional area other than the portion continuous with the small cross-sectional area. Mold.

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