JP3796709B2 - COMPOSITE MOLDED ARTICLE, MOLD FOR MOLDING THE SAME, AND MOLDING METHOD - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a composite molded article, a molding die for the composite molded article, and a molding method.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 9-277305 previously filed by the applicant of the present invention discloses a conventional composite molded article, a molding die thereof, and a molding method. This shows a fixed mold and a slide mold that slides relative to the fixed mold. The fixed mold has a primary molding cavity portion for primary molding in the center and a primary mold. Secondary molding cavities for secondary molding are provided on both sides of the molding cavity in between. The slide mold is provided with two core parts adjacent to each other, and the primary molding cavity and the first core part are aligned at the first position, and the secondary molding is performed at the second position. The cavity portion and the first core portion are configured to be aligned. The secondary molding cavity is provided with a concave portion into which a primary molded product enters during secondary molding, and a sub concave portion into which a material for secondary molding enters continuously. The runner that communicates with the first injection nozzle that injects the first molding material extends straight to the primary molding cavity, and the main runner that communicates with the second injection nozzle that injects the second molding material is the runner. The first runner branches to the first runner and the second runner via the switching device, the first runner is in the sub-recess of the first secondary molding cavity, and the second runner is in the other second Openings are respectively made in the sub-recesses of the secondary molding cavity. The runner switching device includes a bore provided in a position in series with each cavity of the fixed mold, a columnar piston portion disposed in the bore and driven in the axial direction by a runner switching piston / cylinder unit, and a piston portion. And a first passage and a second passage formed at predetermined intervals. When the runner switching piston / cylinder unit is driven to move the piston portion to the first position, the main runner communicates with the first runner via the first passage, and when the piston portion is set to the second position, the main runner passes the second passage. To the second runner via
[0003]
Next, the molding method will be described. In the first step, the slide mold is slid to the first position with respect to the fixed mold, and the primary formed by the primary molding cavity part of the fixed mold and the first core part of the slide mold. The first molding material is injected into the molding cavity from the first injection nozzle through the runner to form a primary molded product, and at the same time, the runner switching piston / cylinder unit is driven to bring the piston portion to the first position. The main runner communicates with the first runner via the first passage, and is held by the first secondary molding cavity portion of the fixed die and the second core portion of the slide die. A second molding material different from the first molding material is injected from a second injection nozzle into a secondary molding cavity (that is, a sub-recess) formed by the molded primary molded product and molded first. Composite molding integrated with the primary molded product Molding a.
[0004]
Next, in the second step, the composite molded product molded in the first step is taken out.
[0005]
In the third step, the slide mold is slid to the second position with respect to the fixed mold while holding the primary molded product formed in the first process, and the primary mold cavity portion and slide of the fixed mold The first molding material is injected from the first injection nozzle into the primary molding cavity formed by the second core portion of the mold to mold the primary molded product, and at the same time, the runner switching piston / cylinder unit. To move the piston portion to the second position, and to communicate the main runner with the second runner through the second passage, so that the second secondary molding cavity portion of the fixed die and the first of the slide die A second molding material is injected from a second injection nozzle into a secondary molding cavity (that is, a sub-recess) formed with the primary molded product molded in the first step held in the core portion of Integrated with the primary molded product Molding a synthetic form products.
[0006]
Next, in the fourth step, the composite molded product molded in the third step is taken out.
[0007]
In the fifth step, the slide mold is slid to the first position with respect to the fixed mold while the primary molded product formed in the third step is held, and is molded in the same manner as in the first step.
[0008]
[Problems to be solved by the invention]
However, in the conventional composite molded article, its molding die and molding method, the runner injection port for injecting molding material into the sub-recess of the secondary molding cavity of the fixed die, the sub-recess, and 1 Since the concave portion into which the next molded product is inserted is continuously arranged in series, the molding material is injected from the runner toward the primary molded product. For this reason, since a large injection pressure is applied to the primary molded product, the primary molded product cannot have a reaction force sufficient to withstand this injection pressure, and the shape that can be molded is limited, Depending on the case, molding may not be possible.
[0009]
The present invention is an improvement over such a conventional one, and a molding die capable of withstanding a large injection pressure of a primary molded product and a molding method using the molding die And a composite molded product.
[0010]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention comprises a fixed mold (10) and a slide mold (12) that slides relative to the fixed mold (10). A plurality of secondary molding cavities (14, 16, 18) are provided, and the slide mold (12) is aligned with the molding cavities (14, 16, 18) of the fixed mold (10). In a molding die for a composite molded product provided with a plurality of core parts (20, 22),
The core part (20, 22) is provided with a split core (24) in which a part of the inner wall forming the core part (20, 22) can move independently,
The movement of the split core (24) is controlled to be restrained or released at a predetermined time.
[0011]
The invention according to claim 2 is the invention according to claim 1, wherein the split core (24) is attached to one end of the connecting member (26) so as to be integrally movable. The other end of the member (26) is an inclined surface (26a) of a predetermined angle, one end of the side member (28) is in contact with the inclined surface (26a) of the connecting member (26), and the inclined surface (26a). The axial position of the side member (28) is arranged so that it can be engaged with the other, and the other end of the side member (28) is connected to a hydraulic cylinder (30, 36) arranged outside the slide mold (12). The side member (28) is moved in the axial direction by driving the hydraulic cylinders (30, 36), and the side member (28) moves the connecting member (26) as it advances. The connecting member (26) can be moved freely by restraining and retracting. It is configured to be characterized in.
[0012]
Of the present invention, the invention according to claim 3 is the invention according to claim 1 or 2, comprising a fixed mold (10) and a slide mold (12),
The fixed mold (10) includes a primary molding cavity (14) for primary molding, and a secondary molding cavity (16) adjacent to the primary molding cavity (14). , 18) and one or more of each,
The slide mold (12) slides with respect to the fixed mold (10) so as to take the first position and the second position, and in the first position, the primary molding cavity (14) and the first mold are located. The core part (20) is aligned, and the second molding cavity part (16) and the first core part (20) are aligned in the second position. is there.
[0013]
Moreover, invention of Claim 4 among this invention WHEREIN: In invention of any one of Claims 1-3, the said primary-molding cavity part (14) is in the center part of a fixed metal mold | die (10), The secondary molding cavities (16, 18) are provided on both sides of the primary molding cavity (14) between them, and the cores (20, 22) are mutually connected. Two of them are provided next to each other.
[0014]
According to the fifth aspect of the present invention, the slide mold (12) is slid to the first position with respect to the fixed mold (10), and the first mold for primary molding of the fixed mold (10) is performed. The core part (20) of the slide mold (12) is formed in the primary molding cavity formed by the one cavity part (14) and one first core part (20) of the slide mold (12). In a state where a part of the inner wall to be controlled is restrained from movement of the split core (24) that can be independently controlled, the first molding material is injected to form the primary molded product (38), and at the same time, the fixed mold A second cavity portion (18) for secondary molding located next to one of the first cavity portions (14) of (10) and the other second core portion (22) of the slide mold (12); The secondary molding cavity formed by the previously molded primary molded product held in the In a state in which the movement of the split core that can be moved and controlled is released, the second molded material different from the first molding material is injected while the split core is retracted by the injection pressure, and the first molded product is molded first. A first step of molding a composite molded product integrated with
The second step of taking out the composite molded product formed in the first step, and the slide mold (12) with respect to the fixed mold (10) while holding the primary molded product (38) formed in the first step The first cavity portion (14) of the fixed mold (10) and the slide mold (12) in a state in which the movement of the split core (24) that can be independently moved and controlled is slid to the second position. The first molding material is injected into the primary molding cavity formed by the second core portion (22) of the first molding to mold the primary molded product, and at the same time, the first cavity of the fixed mold (10). Molded in the first step held by the second cavity part (16) for secondary molding located next to the other part (14) and the first core part (20) of the slide mold (12) In the secondary molding cavity formed with the primary molded product (38), In a state in which the movement of the split core (24) that can be vertically controlled is released, the second molding material different from the first molding material is injected while the split core (24) is retracted by the injection pressure, A third step of molding a composite molded product (40) integrated with the primary molded product;
The fourth step of taking out the composite molded product (40) molded in the third step, and the slide mold (12) with respect to the fixed mold (10) while holding the primary molded product molded in the third step It consists of a fifth step that is slid to the first position and molded in the same manner as the first step.
[0015]
In addition, the code | symbol in the said parenthesis shows the corresponding member of embodiment mentioned later.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall view (partial sectional view) showing a mold according to an embodiment of the present invention, FIG. 2 is a partial sectional view when the mold of the embodiment is opened, and FIG. 4 is a partial cross-sectional view after primary molding after mold clamping, FIG. 4 is a partial cross-sectional view after cooling the primary molded product, and when the mold is opened, and FIG. 6 is a partial cross-sectional view after moving to, FIG. 6 is a partial cross-sectional view after secondary clamping after mold clamping in the second position, FIG. 7 is a partial cross-sectional view when the mold is opened after cooling the secondary molded product, FIG. 8 is a partial sectional view showing a state where the composite molded product is taken out. Detailed description of the same parts as those described in the prior art will be omitted.
[0017]
As shown in FIG. 1, a fixed mold 10 and a slide mold 12 that slides with respect to the fixed mold 10 are formed. The fixed mold 10 has a primary molding cavity portion 14 at the center. Further, secondary molding cavities 16 and 18 are provided on both sides of the primary molding cavity 14 between them, respectively. Each of the secondary molding cavities 16 and 18 is provided with recesses 16a and 18a in which the primary molded product is accommodated, and sub-recesses 16b and 18b in which secondary molding material is continuously inserted. Yes. The slide mold 12 is provided with two core parts 20 and 22 that are aligned with the respective molding cavities 14, 16, and 18 of the fixed mold 10 and adjacent to each other. The slide mold 12 slides with respect to the fixed mold 10 so as to take the first position and the second position. In the first position, the primary molding cavity portion 14 and the first core portion 20 However, the secondary molding cavity portion 18 and the second core portion 22 are aligned, and in the second position, the secondary molding cavity portion 16 and the first core portion 20 are for primary molding. The cavity portion 14 and the second core portion 22 are configured to be aligned with each other.
[0018]
Next, the structure of each of the core portions 20 and 22 will be described, but the split core of the second core portion 22 is in a state of being housed in the slide mold 12 and is shown in the drawing because it is a side view. Therefore, the following description will be made only on the first core portion 20 side, and the second core portion 22 has the same structure as that of the first core portion 20 although not shown.
[0019]
When the secondary molding cavity 16 is aligned with the first core 20, a part of the inner wall facing the sub-recess 16 b can move independently with respect to the injection direction (left and right in FIG. 1). The split core 24 is provided, and the split core 24 is attached to one end of the connecting member 26 so as to be integrally movable. The other end of the connecting member 26 is a 45 ° inclined surface 26a, and can contact the 45 ° inclined surface 28a formed at one end of the side member 28 extending in the vertical direction in the drawing. The other end of the side member 28 is connected to a hydraulic cylinder 30 disposed outside the slide mold 12, and the side member 28 moves in the axial direction by driving the hydraulic cylinder 30. As the side member 28 moves forward, the inclined surface 28a of the side member 28 and the inclined surface 26a of the connecting member 26 come into contact with each other, and the movement of the connecting member 26 is restricted. On the other hand, when the side member 28 is retracted, the inclined surface 28a is separated from the inclined surface 26a of the connecting member 26, and the side member 28 is connected to a position where the inclined surface 26a of the connecting member 26 contacts the inclined surface 28a of the side member 28. The member 26 is movable.
[0020]
In the present embodiment, the angle of the contact surface between the connecting member 26 and the side member 28 is 45 degrees, but the present invention is not limited to this, and it may be appropriately selected depending on the shape and layout of each component. preferable. Furthermore, the sum of the contact angles of the connecting member 26 and the side member 28 is not limited to 90 degrees, and it is preferable to select the sum appropriately depending on the shape and layout of each component.
[0021]
The flow path until the molding material injected from the injection nozzle 32 is filled in the cavity is the same as that described in the prior art, and the switching of the flow path to the two secondary molding cavities 16 and 18 is also possible. This is performed by the runner switching piston / cylinder unit 34 as described in the prior art.
[0022]
In the present embodiment, the moving direction of the split core 24 is the injection direction, but is not limited to this. Further, the moving / attaching directions of the side member 28 and the hydraulic cylinders 30 and 36 are also appropriately adjusted depending on the direction of the split core 24 and are not particularly limited to the vertical direction.
[0023]
Next, the molding method will be described.
In the first step, first, as shown in FIG. 2, the slide mold 12 is slid to the first position with respect to the fixed mold 10, and the primary molding cavity portion 14 of the fixed mold 10 and the slide mold are moved. The first core portion 20 of the mold 12 is aligned to form a primary molding cavity, the hydraulic cylinder 30 is driven to advance the side member 28, and the movement of the connecting member 26 is constrained to divide the core 24. The position of is fixed. Next, as shown in FIG. 3, the first molding material 38 is injected from the injection nozzle 32 to form a primary molded product 38.
[0024]
At the same time, the previously molded primary molded product held by the second core portion 22 of the slide mold 12 is accommodated in the concave portion 18a of the secondary molding cavity 18 of the fixed mold 10, and the secondary mold is accommodated. The molding cavity is formed, and the hydraulic cylinder 36 is driven to retract the side member, releasing the restraint of the connecting member and making the split core movable. Next, when a second molding material different from the first molding material is injected from the injection nozzle 32 to the sub-recess 18b, the secondary molding cavity is filled with the second molding material while the split core is retracted by the injection pressure. Then, a composite molded product integrated with the previously molded primary molded product is molded.
[0025]
In the second step, the composite molded product (not shown) formed in the first step is cooled, and then opened and taken out as shown in FIG.
[0026]
In the third step, as shown in FIG. 4, the slide mold 12 is moved as shown in FIG. 5 with the primary molded product 38 formed in the first step held in the first core portion 20. Slide the fixed mold 10 to the second position. Next, a primary molding cavity is formed by the primary molding cavity portion 14 of the fixed mold 10 and the second core portion 22 of the slide mold 12, and the side member is advanced by driving the hydraulic cylinder 36. In a state where the movement of the split core is constrained, the first molding material is injected to mold the primary molded product.
[0027]
At the same time, as shown in FIG. 6, molding is performed in the first step held in the first core portion 20 of the slide mold 12 in the concave portion 16 a of the secondary molding cavity 16 of the fixed mold 10. The primary molded product 38 is accommodated, a cavity for secondary molding is formed, the hydraulic cylinder 30 is driven, the side member 28 is retracted, the constraint of the connecting member 26 is released, and the split core 24 is movable. To do. Next, when a second molding material different from the first molding material is injected from the injection nozzle 32 into the sub-recess 16b, the second molding material is put into the secondary molding cavity while the split core 24 is retracted by the injection pressure. The composite molded product 40 that is filled and integrated with the previously molded primary molded product is molded.
[0028]
In the fourth step, after the composite molded product 40 and the primary molded product (not shown) are cooled, the fixed mold 10 is held with the composite molded product 40 held in the slide mold 12 as shown in FIG. Then, the slide mold 12 is opened, and the composite molded product 40 molded in the third step is taken out as shown in FIG.
[0029]
In the fifth step, the slide mold 12 is slid to the first position with respect to the fixed mold 10 while holding the primary molded product formed in the third step, and is molded in the same manner as in the first step.
[0030]
【The invention's effect】
As described above, the invention according to the first aspect of the present invention restricts the movement of the split core (24) when performing primary molding, and splits when performing secondary molding. By releasing the movement of the core (24), when the secondary molding material is injected, the split core (24) is moved by this injection pressure, so that it can withstand a large injection pressure, that is, a reaction force. The range of shapes that can be molded is expanded.
[0031]
In the present invention, in the first aspect of the present invention, when the primary molding is performed, the hydraulic cylinders (30, 36) are driven to advance the side member (28) and the inclined surfaces (26a) thereof are moved forward. ) And the inclined surface (26a) of the connecting member (26) can be brought into contact with each other to restrain the movement of the split core (24). On the other hand, when performing secondary molding, the hydraulic cylinders (30, 36) are driven to retract the side member (28), and the inclined surface (28a) thereof and the inclined surface (26a) of the connecting member (26). The connecting member (26) is moved from this separated position, and the split core (26a) and the inclined surface (28a) of the side member (28) come into contact again. 24) can be movable. Further, when the inclined surface (26a) of the connecting member (26) is moved to a position where it comes into contact with the inclined surface (26a) of the side member (28) with the injection pressure of the secondary molding, the split core (24) is moved. Although it will be restrained, since the side member (28) and the connecting member (26) are arranged at an angled position and are in contact with each other through the inclined surfaces (26a, 28a), they are added to these. The injection pressure is dispersed and can withstand a large injection pressure.
[0032]
Further, in the present invention, the invention according to claim 3 is, in the first position, the primary molding cavity (14) and the first core (20), and the secondary molding cavity ( 18) and the second core part (22) can be aligned simultaneously, and in the second position, the secondary molding cavity part (16) and the first core part (20) The primary molding cavity portion (14) and the second core portion (22) can be simultaneously aligned. Thereby, since primary molding and secondary molding can be performed simultaneously, a shortening of a molding cycle and an improvement in productivity can be obtained.
[0033]
Further, in the present invention, the core part (20, 22) is provided with a split core (24), and the split core part (24) is restrained or released. As a result, each core part (20, 22) becomes a core part for primary molding or a core part for secondary molding. Therefore, when moving from primary molding to secondary molding, and 2 When moving from the next molding to the primary molding, it is only necessary to slide the core parts (20, 22) into the adjacent cavity parts (14, 16, 18).
[0034]
In the invention according to claim 5 of the present invention, the core portion (20, 22) is in a state in which the movement of the split core (24) is released when performing the secondary molding. In this case, even if a large injection pressure is applied, the split core (24) moves independently, so that it can withstand the large injection pressure. Thereby, since it can respond also to the shape which requires a big injection pressure, the range of the shape which can be shape | molded spreads. The core portions (20, 22) are in a state in which the movement of the split core (24) is constrained when performing primary molding, and the movement of the split core (24) is released when performing secondary molding. Therefore, it is possible to simultaneously perform the primary molding with one core part (20, 22) and the secondary molding with the other core part (20, 22). Can be shortened.
[Brief description of the drawings]
FIG. 1 is an overall view (partially sectional view) showing a mold according to an embodiment of the present invention.
FIG. 2 is a partial cross-sectional view when the mold of the embodiment is opened.
FIG. 3 is a partial cross-sectional view obtained by performing primary molding after clamping the mold according to the embodiment.
FIG. 4 is a partial cross-sectional view when the mold is opened after cooling the primary molded product.
FIG. 5 is a partial cross-sectional view after the slide mold of the embodiment has moved to a second position.
FIG. 6 is a partial cross-sectional view in which secondary molding is performed after clamping at the second position.
FIG. 7 is a partial cross-sectional view when the mold is opened after cooling the secondary molded product.
FIG. 8 is a partial cross-sectional view showing a state where a composite molded product is taken out.
[Explanation of symbols]
20, 22 Core portion 24 Split core 26 Connecting members 26a, 28a Inclined surface 28 Side members 30, 36 Hydraulic cylinder

Claims (5)

It consists of a fixed mold (10) and a slide mold (12) that slides relative to the fixed mold (10). ) And a plurality of core parts (20, 22) aligned with the molding cavities (14, 16, 18) of the fixed mold (10) are provided on the slide mold (12). In molds for composite molded products,
The core part (20, 22) is provided with a split core (24) in which a part of the inner wall forming the core part (20, 22) can move independently,
A mold for molding a composite molded product, wherein the movement of the split core (24) is controlled to be restrained or released at a predetermined time.   The split core (24) is movably attached to one end of a connecting member (26), and the other end of the connecting member (26) is an inclined surface (26a) having a predetermined angle. One end of (28) is in contact with the inclined surface (26a) of the connecting member (26), and the axial position of the side member (28) is disposed so as to be movable with respect to the inclined surface (26a). The other end of 28) is connected to a hydraulic cylinder (30, 36) arranged outside the slide mold (12), and the side member (28) moves in the axial direction by driving the hydraulic cylinder (30, 36). The side member (28) is configured to restrain the movement of the connecting member (26) as it advances, and to move the connecting member (26) as it moves backward. 2. For forming a composite molded product according to claim 1 Type. The fixed mold (10) includes a primary molding cavity (14) for primary molding and a secondary molding cavity (secondary molding) adjacent to the primary molding cavity (14). 16 and 18) are provided, respectively.
The slide mold (12) slides with respect to the fixed mold (10) so as to take a first position and a second position. In the first position, the first molding cavity (14) and the first mold are located. The core part (20) of the second part is aligned, and the second molding cavity part (16) and the first core part (20) are aligned in the second position. Molds for composite molded products.   The primary molding cavity (14) is at the center of the fixed mold (10), and the secondary molding cavity (16, 18) is the primary molding cavity (14) between them. The composite molded article according to any one of claims 1 to 3, wherein the core part (20, 22) is provided adjacent to each other, and two core parts (20, 22) are provided adjacent to each other. Mold for molding. The slide mold (12) is slid to the first position with respect to the fixed mold (10), and the first cavity portion (14) for primary molding of the fixed mold (10) and the slide mold (12). A part of the inner wall forming the core part (20) of the slide mold (12) can be independently moved and controlled in the primary molding cavity formed by one of the first core parts (20). With the movement of the split core (24) constrained, the first molding material is injected to form the primary molded product (38), and at the same time, the first cavity portion (14) of the fixed mold (10) is molded. The primary molded product molded first, which is held by the second cavity portion (18) for secondary molding located next to one and the other second core portion (22) of the slide mold (12). In the secondary molding cavity formed by In this state, the second molding material different from the first molding material is injected while the split core is retracted by the injection pressure to form a composite molded product integrated with the previously molded primary molded product. 1 process,
A second step of taking out the composite molded product formed in the first step;
The slide mold (12) is slid to the second position with respect to the fixed mold (10) while holding the primary molded product (38) formed in the first step, and can be independently moved and controlled. A primary formed by the first cavity part (14) of the stationary mold (10) and the second core part (22) of the slide mold (12) in a state where movement of the core (24) is constrained. The first molding material is injected into the molding cavity to mold the primary molded product, and at the same time, the secondary molding is positioned next to the other of the first cavity portion (14) of the fixed mold (10). Secondary molding formed by the second cavity portion (16) and the primary molded product (38) molded in the first step held by the first core portion (20) of the slide mold (12). The movement of the split core (24), which can be controlled independently of movement, is released in the cavity for In this state, the second molding material different from the first molding material is injected while the split core (24) is moved backward by the injection pressure to form a composite molded product (40) integrated with the primary molded product. A third step;
A fourth step of taking out the composite molded product (40) molded in the third step;
Fifth step of forming the slide mold (12) to the first position with respect to the fixed mold (10) while holding the primary molded product formed in the third step, and forming the same as in the first step. A method for forming a composite molded product comprising:

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