JP4449515B2 - Injection mold and method of manufacturing injection molded body - Google Patents

Description

  The present invention relates to a molding die and molding method for sequentially injecting and molding two or more resin-based materials such as two-color molding in injection molding, or manufacturing an injection-molded body having a plurality of parts formed from different resin-based materials. Regarding the method.

  A method of continuously injecting and molding different resin-based materials to form a molded body having different resin-based material portions, so-called multicolor molding (including two-color molding) is used for molding various parts. ing. There are various types of molds for molding by this method, which have a pair of molds and are provided with slide pieces that can be slid in a state in which these molds are clamped. For example, the slide piece includes a cavity (hereinafter referred to as a second cavity) for molding a resin to be injected second, and a cavity portion (hereinafter referred to as a second cavity) that is injection-molded with the first resin by sliding the slide piece. There is a mold in which a state in which the second cavity is isolated from the first cavity and the communication surface of the first cavity is blocked and a state in which the second cavity communicates with the first cavity are formed (for example, a patent) Reference 1). Alternatively, the slide piece constitutes a part of the second cavity, and the slide enters the space that becomes the second cavity and closes the communication portion with the first cavity to block the communication surface of the first cavity. There is a mold that forms a second cavity that communicates with the first cavity by cooperation with a pair of molds (see, for example, Patent Document 2). In a mold having such a slide piece, the first resin-based material injection molding and the second resin-based material injection molding can be performed with a single mold, so that the number of facilities and manufacturing processes can be reduced. Since the mold clamping state is maintained between the first molding and the second molding, the temperature drop during the second molding is suppressed, and the integral molding is easy. In this specification, “resin-based material” includes injectable resins and elastomers.

Japanese Patent Laid-Open No. 10-278076 Japanese Patent Laid-Open No. 62-273815

  By the way, the sliding distance of the slide piece in these molds depends on the shape of the second cavity, particularly the shape of the communication surface of the second cavity with the first cavity. That is, since the slide piece must block the second cavity from the first cavity, the communication surface 75 of the first cavity 71 and the second cavity 73 is substantially the same as in the injection molded body 100 shown in FIG. In the case of a U-shape, as shown in FIG. 8, the slide piece 77 requires a blocking portion 79 that is at least as large as or larger than the communication surface 75 in the sliding direction. Further, in order to allow the first cavity 71 and the second cavity 73 to communicate with each other, the slide piece 77 needs a slide amount (a distance l shown in FIG. 8) that allows the blocking portion 79 to be completely separated from the communication surface 75. It becomes. In FIG. 8, the slide piece 77 includes a second cavity 73 that communicates with the first cavity 71 through the communication surface 75, and the second cavity 73 moves away from the communication surface 75 at the same time as the second cavity 73 moves away from the first cavity 71. It is in full communication with 71. Therefore, in the case of such a communication surface shape, since the sliding amount of the slide piece is large, the slide piece drive device also becomes large, and the occupied space becomes large. In the conventional injection molding machine, the mold clamping pressure is set in accordance with the size of the mold to be attached, that is, the size of the cavity. For this reason, in a molding die that is formed largely due to the influence of the slide piece, a molding machine that can output an excessive clamping pressure as compared with the volume of the cavity may be inevitably used.

Accordingly, an object of the present invention is to provide an injection mold having a slide piece with a reduced slide amount (slide distance).
Further, in the present invention, in the method of manufacturing an injection molded body having portions made of different resin materials by using an injection mold having a slide piece, an injection molded body manufacturing method in which the slide amount of the slide piece is reduced. It is an issue to provide.

A first invention of the present invention, which is a means for solving the above problems, is an injection mold having a fixed mold and a movable mold that are abutted with each other to form a cavity, and the cavity is movable with the fixed mold and the movable mold. A first cavity that is always formed by abutment with a mold, and a second cavity that is formed to communicate with the first cavity, each along a communication surface between the first cavity and the second cavity. A plurality of slide pieces that can slide in different directions on the same plane are provided, and the plurality of slide pieces include a cavity portion that forms the second cavity,
Wherein the plurality of slide frames, characterized in that sliding between the second forming position for forming a first molding position for blocking the communication surface, the second cavity in a state of communicating with the first cavity An injection mold is provided.
According to this invention, the mold includes a plurality of slide pieces capable of blocking and communicating with the communication surface between the first cavity and the second cavity. Each of the plurality of slide pieces can be slid in different directions along the communication surface, and the position of each of the slide pieces can be switched between a blocking state and a communication state with a smaller slide amount. That is, the communication surface is switched between a blocking state and a communication state by a plurality of slide pieces divided so that the sliding amount between the first forming position and the second forming position becomes smaller. Therefore, in the injection mold of the present invention, the size and the slide amount of each slide piece are reduced, and the drive means of the slide piece, for example, the cylinder may be small as appropriate, and the whole is small.
A second invention of the present invention provides an injection mold according to the first invention, wherein the plurality of slide pieces are slidable in conjunction with each other between a first molding position and a second molding position.
According to the present invention, since the plurality of slide pieces are slid between the first molding position and the second molding position in conjunction with each other, the injection molding die in which the slide pieces slide efficiently in a shorter time. .
Further, according to a third aspect of the present invention, in the second aspect, the plurality of slide pieces are provided in contact with each other, the at least one slide piece includes a cylinder for sliding the slide piece, and the other slide pieces are the first piece. An injection mold that is biased toward a first molding position or a second molding position is provided.
According to this invention, the other slide piece arranged in the first molding position or the second molding position by urging is in direct contact with the slide piece including the cylinder or indirectly through the other slide piece. Yes. For this reason, when the slide piece provided with the cylinder is driven by the cylinder, the driving force is transmitted to the other slide pieces, and all the slide pieces slide to the second molding position or the first molding position. Therefore, the injection mold of the present invention is more easily downsized with a simple configuration, and the positions of a plurality of slide pieces can be easily switched.
According to a fourth aspect of the present invention, there is provided a method of manufacturing an injection-molded body having different resin portions, wherein a fixed cavity and a movable mold are abutted to form a first cavity, and formed in communication with the first cavity. The communication surface with the second cavity can be slid in different directions on the same plane along the communication surface, and is blocked by a plurality of slide pieces including a cavity portion that forms the second cavity , A first molding step of injecting the first molding material into the first cavity to mold the first resin portion; and the second cavity communicates with the first cavity by sliding the plurality of slide pieces after the first molding step. And a second molding step of injecting a second molding material into the second cavity and molding the second resin part integrally with the first resin part.
According to this invention, the slide distance of the slide piece is reduced by providing a plurality of slide pieces, and the slide time of the slide piece, that is, the time from the molding of the first resin portion to the injection of the second molding material. Shorter. Thereby, since the 2nd resin part can be shape | molded while maintaining the state where the temperature of the 1st resin part is higher, it can integrate more favorably. Therefore, according to the production method of the present invention, it is possible to shorten the molding time and obtain a good injection molded body (multicolor molded body). In addition, since the molding die having a slide piece with a smaller slide amount is smaller and the cylinder or the like is smaller, an injection molded body can be manufactured with reduced space and / or power. The first molding material and the second molding material can be materials arbitrarily selected from resin-based materials.

In the present invention, by providing an injection mold having a slide piece with a reduced slide amount, the injection mold can be reduced in size, and the molding equipment can be reduced in size.
Further, in a method of manufacturing an injection molded body having portions made of different resin-based materials using an injection mold having a slide piece, by providing an injection molded body manufacturing method in which the slide amount of the slide piece is reduced, a smaller size is provided. An injection-molded article can be produced efficiently in a shorter time using the above equipment.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows a mold 1 according to an embodiment of the present invention. The molding die 1 includes a fixed die 2 located on the left side in FIG. 1, a movable die 4 located on the right side, and a slide piece group 6 provided on the movable die 4. The fixed mold 2 and the movable mold 4 are clamped as shown in FIG. 2 to supply the first cavity 10 for molding the first molding material and the first molding material 10 to the first cavity 10. The first resin supply unit 12 is formed. The slide piece group 6 is formed so as to constitute a second cavity 14 for molding the second molding material, as will be described in detail later. The fixed die 2 and the slide piece group 6 (first slide piece 21) are fixed when the fixed die 2 and the movable die 4 are clamped and the slide piece group 6 is in a second molding position to be described later (FIG. 4), the second resin supply unit 16 is formed.

  The fixed mold 2 constitutes a cavity surface 10 a that forms the outer surface of the first cavity 10, and a part of the first resin supply unit 12 and the second resin supply unit 16. That is, openings 12a and 16a (in the drawings, the state where the injection port portion of the injection molding machine is mounted) in which the first molding material and second molding material injection molding machines are mounted, and the opening 12a. , 16a and tubular sprues 12b, 16b extending toward the butting surface. Further, the first resin supply unit 12 is configured such that the tip of the sprue 12b and the surface up to the cavity surface 10a form a runner 12c and a gate 12d by abutment with the movable mold 4 as shown in FIG. Yes.

  The movable mold 4 constitutes a cavity surface 10 b that forms the inner surface of the first cavity 10 and a part of the first resin supply unit 12. That is, when the surface from the position facing the tip of the sprue 16b to the cavity surface 10b is abutted against the fixed mold 2 as shown in FIG. 2, the runner 16c and the gate 16d are formed. The movable mold 4 includes a concave portion 4a having a shape opened to the fixed mold 2 side at a position where the first cavity 10 communicates with the second cavity 14 (upper side in FIGS. 1, 2 and 4). The concave portion 4a is a portion where the slide piece group 6 is slidably arranged, and is formed in an inverted T shape (on the basis of the upper and lower sides in FIG. 3) when viewed from the abutting surface. In this embodiment, the slide piece group is formed. Also plays the role of 6 guides. In addition, a cubic convex portion 4b is provided at the center of the concave portion 4a. The convex part 4b is a part which suppresses the 2nd slide piece 22 and the 3rd slide piece 23 which are mentioned later against energizing.

As shown in FIG. 3, the slide piece group 6 includes a first slide piece 21 and a total of three slide members including a second slide piece 22 and a third slide piece 23 provided on both sides thereof. The first slide piece 21 is a portion that extends vertically in FIG. 3 of the recess 4a, the second slide piece 22 is a portion that extends to the left and right of the protrusion 4b in FIG. 3 of the recess 4a, and a third slide piece. 23 are respectively arranged in portions of the concave portion 4a that extend to the right and left of the convex portion 4b in FIG. The 1st slide piece 21, the 2nd slide piece 22, and the 3rd slide piece 23 are formed in the shape which contacts the inner peripheral surface of the recessed part 4a, and are guided by the inner surface of the recessed part 4a and are slid in the extending direction of the recessed part 4a. Is possible. Here, the sliding direction of each piece is parallel to the communication surface 18 between the first cavity 10 and the second cavity 14.
The first slide piece 21 and the second slide piece 22 are slidably in contact with each other at end faces 21b and 22b extending in parallel to the respective slide surfaces and at a predetermined angle with respect to the slide direction of each piece. The first slide piece 21 and the third slide piece 23 are slidably in contact with each other at end faces 21c and 23b that are parallel to the slide surface and extend at a predetermined angle with respect to the slide direction of each piece.

The first slide piece 21, the second slide piece 22, and the third slide piece 23 each have an end surface on the same plane as the communication surface 18 of the first cavity 10 and the second cavity 14. The portion is formed in blocking portions 21 a, 22 a, and 23 a that can block the communication surface 18. The blocking portions 21a, 22a, and 23a block the second cavity 14 from the first cavity 10 at a first molding position (see FIGS. 2 and 3), which will be described later, and the communicating portion of the first cavity 10 with the second cavity 14 The part which shape | molds the surface of is comprised.
In the present embodiment, the first slide piece 21, the second slide piece 22, and the third slide piece 23 include cavity portions 14 a, 14 b, and 14 c each having a shape obtained by dividing the second cavity 14. Each of these cavity portions 14 a, 14 b, and 14 c has a communication surface 18 portion with the first cavity 10. The cavity portions 14a, 14b, and 14c are continuous surfaces at the second molding position (see FIG. 5), which will be described later, to form a cavity, and the cavity surfaces 10a and 10b of the fixed mold 2 and the movable mold 4 Both form the second cavity 14 continuously.

  The drive mechanism for sliding the slide piece group 6 has a known configuration and is not particularly limited. For example, an air cylinder or a hydraulic cylinder can be attached to each piece. Preferably, a drive mechanism capable of interlocking the slide piece group 6 is preferable because power generation means that contributes to an increase in the size of the mold is reduced. As shown in FIG. 3, the mold 1 of the present embodiment includes one cylinder 31 as a power source and two urging means 41 and 46 as a part of the interlocking mechanism. Further, as described above, the slide pieces are used for power transmission by bringing the slide pieces into contact with each other in a slidable manner.

In the present embodiment, the cylinder 31 is provided on the outside in the sliding direction of the first slide piece 21, that is, on the upper side in FIGS. 1 to 3, and is fixed to the movable die 4. The rod 32 of the cylinder 31 is provided so as to move in the vertical direction in FIG. 3, and the first slide piece 21 is connected to the tip.
The urging means 41 and 46 are connected to the second slide piece 22 and the third slide piece 23, and are slid outward in the sliding direction of each slide piece, that is, the left side of the second slide piece 22 and the third slide piece 23 in FIG. It is provided on the right side. In the present embodiment, each urging means 41, 46 includes stoppers 42, 47 fixed to the movable mold 4, rods 43, 48 penetrating the stoppers 42, 47, and coil springs 44, 49. The stoppers 42 and 47 are plate members that extend perpendicular to the sliding direction of the second slide piece 22 and the third slide piece 23, respectively, and are fixed to the movable die 4. The stoppers 42 and 47 have holes through which the rods 43 and 48 can be inserted. Each of the rods 43 and 48 is connected to the second slide piece 22 or the third slide piece 23 at one end, passed through the holes of the stoppers 42 and 47, and has stoppers 43a and 48a at the other end. The coil springs 44 and 49 are respectively passed between the rods 43 and 48 and provided between the second slide piece 22 or the third slide piece 23 and the stoppers 42 and 47, and are provided to the stoppers 42 and 47. The pressers 42a and 47a and the second slide piece 22 or the third slide piece 23 are pressed against each other.

  As shown in FIGS. 2 and 3, the slide piece group 6 is disposed at a first molding position that blocks the communication surface 18 between the first cavity 10 and the second cavity when the rod 32 of the cylinder 31 is on the upper side. At this time, the first slide piece 21 is positioned upward in FIG. 3 by the rod 32, the cavity portion 14a is above (outside) the communication surface 18 of the first cavity 10, and the blocking portion 21a is the communication surface. 18 is shut off. Further, the second slide piece 22 is positioned more centrally by the rightward biasing in FIG. 3 by the biasing means 41, and the cavity portion 14 b is to the right (inside) from the communication surface 18 of the first cavity 10. The blocking portion 22 a blocks the communication surface 18. The third slide piece 23 is positioned more centrally by the biasing means 46 biased leftward in FIG. 3, and the cavity portion 14 c is located on the left (inside) from the communication surface with the first cavity 10. The blocking part 23 a blocks the communication surface 18. At this time, the end surface 21b of the first slide piece 21 and the end surface 22b of the second slide piece 22 are in close contact with each other, and the end surface 21c of the first slide piece 21 and the end surface 23b of the third slide piece 23 are in close contact with each other. The surface 18 is completely blocked by the three blocking portions 21a, 22a, and 23a.

  As shown in FIGS. 4 and 5, the slide piece group 6 has a second surface that allows the first cavity 10 and the second cavity 14 to communicate with each other through the communication surface 18 when the rod 32 of the cylinder 31 is moved downward. Arranged at the molding position. At this time, in this embodiment, the first slide piece 21 is in contact with the convex portion 4b of the movable mold 4 at the lower end thereof, and is located at the lowest position in FIG. At this time, the cavity portion 14 a of the first slide piece 21 completely coincides with the communication surface 18 with the first cavity 10. The second slide piece 22 is positioned on the left side in FIG. 3 against the urging force of the urging means 41 when the end face 22b is pressed by the end face 21b of the first slide piece 21, and the cavity portion 14b is It completely coincides with the communication surface 18 with the first cavity 10. In the same manner as the second slide piece 22, the third slide piece 23 is pressed rightward in FIG. 3 against the urging force of the urging means 46 when the end face 23 b is pressed by the end face 21 c of the first slide piece 21. And the cavity portion 14c completely coincides with the communication surface 18 with the first cavity 10. At this time, the end face 21b of the first slide piece 21, the end face 22b of the second slide piece 22, the end face 21c of the first slide piece 21, and the end face 23b of the third slide piece 23 are in close contact with each other, and the cavity portion 14a and The cavity part 14b and the cavity part 14a and the cavity part 14c are completely coincident to form the second cavity 14. And the 2nd cavity 14 connected to the whole communication surface of the 1st cavity 10 is formed.

  In this way, the slide piece group 6 of the mold 1 is blocked by sliding to a position where the cavity portions 14a to 14c of the respective slide pieces, that is, the first to third slide pieces 21 to 23 do not overlap the communication surface 18. The communication surface 18 can be blocked by the portions 21a to 23a. For this reason, compared with the case where the single slide piece which can interrupt | block the communication surface 18 shown in FIG. 3 is provided, the sliding amount of each slide piece is remarkably small. Thus, since the slide amount is small and the piece itself is smaller, the slide area of each slide piece is smaller, and it is possible to efficiently avoid the molding die 1 from becoming large. Further, such a slide piece can be slid by a smaller driving means, and the driving means becomes smaller, and the enlargement of the mold 1 can be avoided reasonably. Furthermore, since the first slide piece 21, the second slide piece 22, and the third slide piece 23 are configured to be interlocked with each other, the number of cylinders 31 as a driving unit is one, and the mold 1 is increased in size and weight. It is well mitigated.

Next, a method for manufacturing the injection molded body 100 using the molding die 1 of the present embodiment will be described.
First, prior to the manufacturing method, an injection molded body 100 obtained by the mold 1 will be briefly described with reference to FIG. The injection-molded body 100 is a cover that protects the rotational axis of the seat back, the reclining mechanism, and the like from the outside in the vehicle seat. The injection-molded body 100 is made of hard plastic, for example, polypropylene, and only the portion located on the rotation path of the seat back is made of a thermoplastic elastomer, for example, TPO (olefin-based thermoplastic elastomer). In the following description of the manufacturing method, the hard plastic portion is called the first resin portion 102, the thermoplastic elastomer portion is called the second resin portion 103, the hard plastic is the first molding material, and the thermoplastic elastomer is the second molding. It will be called a material.

First, the fixed mold 2 and the movable mold 4 of the mold 1 are clamped from the opened state in FIG. 1 to the butted state in FIG. Thereby, the 1st cavity 10 and the 1st resin supply part 12 are formed. At this time, the slide piece group 6 is disposed at the first molding position shown in FIGS. 2 and 3, and the communication surface 18 between the first cavity 10 and the second cavity 14 is blocked.
In this state, the first molding material is supplied to the first resin supply unit 12 by injection using a known injection molding machine, and the first cavity 10 is filled with the first molding material. Thereby, the 1st resin part 102 is shape | molded. Thereby, the first molding step is completed.

Next, the slide piece group 6 is slid and disposed at the second molding position while the movable mold 4 is disposed at the mold clamping position. That is, the rod 32 of the cylinder 31 is lowered until the first slide piece 21 contacts the convex portion 4 b of the movable mold 4. As a result, the slide piece group 6 moves to the second molding position, and the first slide piece 21, the second slide piece 22, and the third slide piece 23 form the second cavity 14, and the fixed mold 2 and the first slide piece. The second resin supply unit 16 is formed between the second resin supply unit 16 and the second resin supply unit 16.
In this state, the second molding material is supplied to the second resin supply unit 16 by injection using a known injection molding machine, and the second molding material is filled into the second cavity 14. At this time, the second molding material is molded into a shape along the second cavity 14, and comes into contact with the first resin portion 102 at the joining surface 105 to be integrated. Thereby, the 2nd resin part 103 can be shape | molded and a 2nd shaping | molding process is completed.
Thereafter, the mold is opened by appropriate cooling or the like, the movable mold 4 is separated from the fixed mold 2, and the molded body is taken out. The injection-molded article 100 can be obtained by appropriately performing a process such as deburring.

  In this manufacturing method, after the first molding step is completed, the slide piece group 6 is moved from the first molding position to the second molding position before the second molding material is injected. However, since the slide amount of each piece is small, it is shorter. The position can be changed over time. In particular, since the second slide piece 22 and the third slide piece 23 move in conjunction with the first slide piece 21, a plurality of pieces can be surely slid simultaneously, which is efficient. Therefore, the second molding material can be injected and molded while the first resin portion 102, the fixed mold 2 and the movable mold 4 molded in the first molding step are warm, and the joint strength of the injection molded body is better. An injection molded body 100 can be obtained. Further, when a known hot runner (not shown) is used in combination, the runner length can be shortened, so that the yield of the molding material can be improved. In particular, in the present embodiment, the cavity portions 14a to 14c constituting the second cavity 14 are integrated with the slide pieces 21 to 23, and the second cavity 14 is quickly changed to the first cavity 10 only by sliding of the pieces. Since it communicates, the required time between the 1st molding process and the 2nd molding process can be shortened.

The present embodiment is not limited to the above embodiment, and various modifications can be made.
For example, the number of slide pieces in the slide piece group is not limited to three, but may be two or four or more. FIG. 7A shows slide pieces 61 and 62 that can cut off the communication surface 18 of the above-described embodiment by two slide pieces and have a cavity portion that constitutes the second cavity 14. These are compared with the case where the slide pieces 61 and 62 are moved in one direction integrally by sliding the slide piece 61 toward the upper left and the slide piece 62 toward the lower left in FIG. It is possible to move from the second molding position to the first molding position with a smaller slide amount. Also in this configuration, the interlocking drive mechanism similar to the above embodiment can be used. For example, a cylinder that presses from the upper left to the lower right is connected to the slide piece 61, and the slide piece 62 is inactivated in the left direction or the lower left direction in FIG. By connecting the biasing means, the slide pieces 61 and 62 can be interlocked.

  Moreover, the movement form of a slide piece is not limited to this embodiment. For example, when there are three slide pieces, as shown in FIG. 7B, in the first molding position, the first slide piece 71 is located below the second molding position, and the second slide piece 72, The three slide pieces 73 may be located outside the second molding position, that is, on the upper left side and the upper right side in FIG. Further, when the number of slide pieces is 4 or more, for example, the number of cylinders may be 2 or more, and the number of biasing means may be (slide piece number) − (cylinder number). Further, when a plurality of slide pieces are provided apart from each other, the slide pieces can be interlocked by using a known configuration such as a rack and pinion as a drive mechanism.

  The plurality of slide pieces may not include the cavity portion constituting the second cavity. Each slide piece is a member that can at least partially block the communication surface. For example, apart from the slide piece according to the present invention, an injection mold having a slide mold having a second cavity can be used. In this molding die, in the first molding step, the slide piece blocks the communication surface of the first cavity, and in the second molding step, the slide piece retracts to a position where it does not block the communication surface of the first cavity, A slide mold having the second cavity is in close contact with the communication surface of the first cavity.

Furthermore, the slide piece group, that is, the plurality of slide pieces is not limited to the form provided in the movable type, and may be provided in the fixed type.
In addition, the resin-based material to which the present manufacturing method can be applied and the combination of the resin-based materials are not limited to the above-described embodiment, and an appropriate resin-based material can be selected from various thermoplastic resins and thermoplastic elastomers. Is possible.

It is a sectional side view of the shaping | molding die which concerns on one embodiment of this invention. It is a sectional side view which shows the shaping | molding die of FIG. 1 in a 1st shaping | molding position. FIG. 2 is an enlarged cross-sectional view showing a slide piece portion of the molding die of FIG. 1 at a first molding position. It is an expanded side sectional view which shows the slide piece part of the shaping | molding die of FIG. 1 in a 2nd shaping | molding position. FIG. 5 is an enlarged cross-sectional view showing a slide piece portion of the forming die in FIG. 1 at a second forming position. FIG. 2 is a perspective view of an injection molded body that can be manufactured using the mold of FIG. 1. It is a schematic diagram which shows the modification of the movement form of a slide piece. It is sectional drawing which shows the principal part of a shaping | molding die provided with the conventional slide piece.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 2 Fixed mold 4 Movable mold 4a Recess 4b Protrusion 6 Slide piece group 10, 71 1st cavity 10a, 10b Cavity surface 12 1st resin supply part 12a Opening 12b Sprue 12c Runner 12d Gate 14, 73 2nd cavity 14a, 14b, 14c Cavity portion 16 Second resin supply portion 16a Opening portion 16b Sprue 16c Runner 16d Gate 18, 75 Communication surface 21 First slide piece 21a Blocking portion 21b, 21c End surface 22 Second slide piece 22a Blocking portion 22b End surface 23 Third slide piece 23a Blocking portion 23b End face 31 Cylinder 32 Rod 41, 46 Biasing means 42, 47 Stopper 42a, 47a Presser 43, 48 Rod 43a, 48a Retaining stopper 44, 49 Coil spring 100 Injection molded body 102 First resin part 103 2nd resin part 10 Joint surface 77 sliding piece 79 blocking portion

Claims (4)

An injection mold comprising a fixed mold and a movable mold that are abutted against each other to form a cavity,
The cavity includes a first cavity that is always formed by butting the fixed mold and the movable mold, and a second cavity that is formed in communication with the first cavity.
A plurality of slide pieces that can slide in different directions on the same plane are provided along the communication surface of the first cavity and the second cavity, and the plurality of slide pieces form the second cavity. With a cavity part,
Wherein the plurality of slide frames, characterized in that sliding between the second forming position for forming a first molding position for blocking the communication surface, the second cavity in a state of communicating with the first cavity Injection mold.   The injection molding die according to claim 1, wherein the plurality of slide pieces are slidable in conjunction with each other between the first molding position and the second molding position. The plurality of slide pieces are provided in contact with each other,
The injection mold according to claim 2, wherein at least one slide piece includes a cylinder for sliding the slide piece, and the other slide piece is biased toward the first molding position or the second molding position. A method for producing an injection-molded body comprising different resin parts,
The fixed mold and the movable mold are abutted to form the first cavity, and the communication surface with the second cavity formed to communicate with the first cavity is different from each other on the same plane along the communication surface. And a first molding step of molding the first resin portion by injecting the first molding material into the first cavity, blocking with a plurality of slide pieces having a cavity portion forming the second cavity. ,
After the first molding step, the plurality of slide pieces are slid to communicate the second cavity with the first cavity, and the second molding material is injected into the second cavity to integrate the second resin portion with the first resin portion. A method for producing an injection-molded article, comprising: a second molding step for molding the molded article.

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