JP6419518B2 - Insert molding method using insert mold - Google Patents

Description

The present invention relates to an insert molding method using an insert molding die for performing molding by inserting a molded body into a mold and supplying another material to the surface of the molded body.

  Insert molding is frequently used as a method for producing a composite molded body in which a plurality of different materials, for example, metal and resin, metal and rubber, resin and rubber, and the like are adhered to each other. As a typical insert molding method, a method having the following steps is known. First, a molded product (referred to as an insert molded product) is manufactured in a mold. Next, the insert molded product is inserted into the mold, and the mold is clamped. Next, another uncured material is poured into the cavity from a supply port provided in the mold. After the other material is cured and bonded to the insert molded product, the mold is opened and the composite molded body is taken out.

  When the number of the supply ports is small, another material in the uncured state cannot completely cover the surface of the insert molded product, and the risk of producing a defective product increases. In order to avoid such a risk, a method of providing a plurality of supply ports in the mold is employed. Further, when it is desired to cover two or more regions in the insert-molded article with another material, a method of branching the other material in an uncured state into two or more flow paths and supplying the two or more regions to the two or more regions Is known (see, for example, Patent Document 1 and Patent Document 2).

JP 2006-026984 A JP 2004-058407 A

  However, the insert molding method disclosed in Patent Documents 1 and 2 is only a method suitable for forming a relatively large member inside and outside the insert molded product using a mold that clamps in one direction. When a mold having a more complicated structure is used to coat thinly the inner or outer surface of an insert molded product, it cannot be applied as it is. In particular, when a thin coating layer is formed on the surface of an insert molded product using a mold in which a slide block that slides in a direction different from the mold clamping direction is incorporated inside the mold clamping block, the mold and the insert molded product The method described in Patent Document 1 using the gap as a flow path cannot be employed. This is because burrs spread over a wide area and require excessive effort to remove them. Moreover, as disclosed in Patent Document 2, a method in which only a cavity is formed in a block (in Patent Document 2, a lower mold) that is in contact with a coating layer, and a flow path is not formed cannot be employed. Furthermore, a method of adhering a covering part to the above two or more regions is also conceivable, but it may be difficult depending on the surface state of the insert molded product, and in addition, there is an annoyance that requires highly accurate alignment during assembly.

The present invention has been made to solve the above-described problem, and uses a mold having a slidable block in a block clamped in one direction to coat the outer surface or inner surface of an insert molded product. and to provide a molding method using a suitable insert molding molds.

  An insert molding die according to an embodiment for achieving the above object is a die having a slidable block in a block that is clamped in one direction, and is opposed to the upper block and the upper block. A lower block, one or a plurality of slide blocks which are in a region sandwiched between the upper block and the lower block and are slidable in a direction different from the clamping direction of the upper block and the lower block, and the upper block and the lower block Alternatively, at least two separate cavities formed by inserting a molded product between a plurality of slide blocks and a part of the cavity formed through the upper block or the lower block are different from the molded product. One or more primary flow paths through which another cured material can flow, It comprises one or a 2 or more secondary flow paths which can be flowed another material in an uncured state to the other cavity from the inner opening of the formed through the primary flow path to one even without the.

  In the insert molding die according to another embodiment, the slide block is further a pair of blocks that are slidable in both directions toward and away from each other across the molded product.

  In the insert molding die according to another embodiment, the secondary flow path is bent from the primary flow path so that a submarine gate formed inside the slide block can be formed.

  In the insert molding die according to another embodiment, the slide block has a contact surface with an upper block or a lower block having a primary flow path, which is larger than any of the primary flow path and the secondary flow path. A recess having a diameter is provided.

  An insert molding method according to an embodiment is a method of inserting a molded product and molding another material on the surface of the molded product, the upper block, a lower block facing the upper block, and an upper block And a plurality of slide blocks that are slidable in a direction different from the clamping direction of the upper block and the lower block, and are formed between the upper block, the lower block, and the plurality of slide blocks. At least two separate cavities formed by inserting an article, and one or more cavities formed through the upper block or lower block to allow another material to flow uncured to some cavities The primary flow path and at least one of the slide blocks are formed through the other openings from the inner opening of the primary flow path. An insert step of inserting a molded product into the insert molding die using an insert molding die comprising one or two or more secondary flow paths capable of flowing another uncured material up to the bite; , A slide step of sliding at least one of the plurality of slide blocks toward the molded product, a mold clamping step of clamping between the upper block and the lower block, and an uncured state from the primary flow path to some cavities A supply process of supplying another material of the uncured state from the primary flow path to the other cavity through the secondary flow path, and a curing process for curing the uncured another material ,including.

  In the insert molding method according to another embodiment, the molded product is further a casing having an opening on one side and the opposite side being closed, and the supply step is closed from the primary flow path. A process of supplying another material in an uncured state to the surface and supplying another material in an uncured state from the primary channel to the side surface of the housing through the secondary channel.

  In the insert molding method according to another embodiment, the molded product is mainly composed of a thermoplastic resin or a thermosetting resin, and another material is a rubber-like elastic body.

  In the insert molding method according to another embodiment, another material is silicone rubber.

  ADVANTAGE OF THE INVENTION According to this invention, insert molding suitable for coat | covering the outer surface or inner surface of an insert molded product is realizable using the metal mold | die which has a block which can be slid in the block clamped in one direction.

FIG. 1 shows a perspective view of each example of a molded product inserted into an insert molding die according to an embodiment of the present invention and a composite molded body after molding. FIG. 2 is a perspective view (2A) and a runner in (2A) schematically illustrating a joining state of the composite molded body of FIG. 1 and a runner / gate body formed in a mold at the time of rubber injection molding. A perspective view (2B) in which the gate body is partially disassembled is shown. FIG. 3 shows a detailed view of the structure of the runner gate body of FIG. FIG. 4: shows the perspective view for demonstrating the process of inserting an insert molded product in the metal mold | die for insert molding which concerns on this embodiment. FIG. 5 shows a longitudinal sectional view of an insert molding die for explaining the process of FIG. FIG. 6: shows the perspective view for demonstrating the process after inserting an insert molded product in the metal mold | die for insert molding which concerns on this embodiment until taking out a composite molded object. FIG. 7 is a longitudinal sectional view of an insert molding die for explaining the first half of the step of FIG. FIG. 8 is a longitudinal sectional view of an insert molding die for explaining the process following FIG. FIG. 9 is a flowchart for explaining the flow of main steps of the insert molding method according to this embodiment.

  Hereinafter, embodiments of an insert molding die and an insert molding method using the die according to the present invention will be described with reference to the drawings. Hereinafter, the structure of the mold and the molding method using the mold will be described in the same embodiment.

  FIG. 1 shows a perspective view of each example of a molded product inserted into an insert molding die according to an embodiment of the present invention and a composite molded body after molding.

  In this embodiment, a molded product (hereinafter referred to as “insert molded product”) 1 to be inserted into an insert molding die is a cylindrical molded product having an elongated elliptical top surface 2, and the top surface 2 is a speaker housing that opens a surface opposite to the surface 2 (a lower surface in FIG. 1). However, the insert molded product 1 is not limited to a speaker housing, and is not limited to a cylindrical molded product having an elongated elliptical top surface 2. The insert-molded product 1 includes a top surface 2 and side surfaces 4 that are formed so as to extend from the peripheral edge portion 3 in a direction substantially perpendicular to the top surface 2. The opening end surface 5 of the side surface 4 is trimmed and slightly protrudes outward in the radial direction of the opening surface from the side surface 4. The top surface 2 is a region slightly recessed inward from the peripheral edge portion 3 and has a region where a rubber-like elastic layer described later can be formed. Similarly, the side surface 4 is a region that is slightly recessed inward from the peripheral edge portion 3 and the opening end surface 5, and has a region where a rubber-like elastic layer described later can be formed. The inner side surrounded by the side surface 4 is an area in which main components of the speaker can be incorporated. Moreover, the side surface 4 has the recessed part 6 dented inward in the part. However, the size and number of the recesses 6 are not limited to the size and number depicted in FIG. Further, the side surface 4 may be provided with a convex portion protruding outside the side surface 4 in place of the concave portion 6 or together with the concave portion 6.

  The insert-molded product 1 is preferably a member that is completely molded prior to insert molding. However, the insert molded product 1 may not be completely molded before insert molding, but may be completely molded at the time of insert molding. The insert molded product 1 is made of resin in this embodiment. The resin is not particularly limited, but polyamide, polypropylene, polyethylene terephthalate, acrylic resin, polybutylene terephthalate, polycarbonate, polyphenylene sulfide, ABS resin and the like can be suitably used. A particularly preferred resin is polycarbonate. Moreover, a metal or ceramics can also be used as a constituent material of the insert molded product 1. Furthermore, you may comprise the insert molded product 1 from two or more different materials. The important point is that the insert-molded product 1 is made of a material that is not easily deformed by heat during insert molding.

  A product (hereinafter referred to as a “composite molded product”) 10 insert-molded using the insert-molded product 1 has a rubber-like elastic body layer 12 on the top surface 2 of the insert-molded product 1 and a side surface 4 of the molded product 1. A rubber-like elastic body layer 14 is formed on each of them. The rubber-like elastic body layer 12 and the rubber-like elastic body layer 14 are separated by part or all of the peripheral edge 3. A rubber-like elastic body layer 16 continuous from the rubber-like elastic body layer 14 is also formed on the surface of the recess 6. The material constituting the rubber-like elastic layer 12, 14, 16 is not particularly limited, but is a thermosetting elastomer such as silicone rubber, urethane rubber, ethylene propylene rubber or ethylene propylene diene rubber; urethane, ester, styrene Thermoplastic elastomers such as olefins, olefins and fluorines, or composites thereof can be used, and in particular, silicone rubber can be more suitably used. In this embodiment, the opening end face 5 is not covered with the rubber-like elastic layer, but may be covered. The important point is that two or more regions separated from each other on the surface of the insert molded article 1 are coated with a material different from the constituent material of the insert molded article 1. Instead of the rubber-like elastic layers 12, 14, 16, a resin layer different from the resin constituting the insert-molded product 1 may be formed.

  FIG. 2 is a perspective view (2A) and a runner in (2A) schematically illustrating a joining state of the composite molded body of FIG. 1 and a runner / gate body formed in a mold at the time of rubber injection molding. A perspective view (2B) in which the gate body is partially disassembled is shown. FIG. 3 shows a detailed view of the structure of the runner gate body of FIG.

  When the composite molded body 10 is manufactured, a runner / gate body 20 as shown in FIGS. 2 and 3 is formed in a block constituting the insert molding die. As shown in (2B) of FIG. 2, the runner gate body 20 is roughly divided into a primary runner gate body 21 and a secondary runner gate body 22. As will be described later in detail, the primary runner gate body 21 and the secondary runner gate body 22 are respectively formed in different blocks constituting the insert molding die.

  The primary runner gate body 21 has a substantially fork shape, a sprue 30 extending substantially vertically toward the top surface 2, a primary runner 31 extending substantially horizontally from the sprue 30, and substantially vertical from the primary runner 31. A top surface primary gate 32 extending in the direction, and two side surface primary gates 33 extending substantially vertically with the top surface primary gate 32 interposed therebetween. In order to form the rubber-like elastic body layer 12 on the top surface 2 and the rubber-like elastic body layer 14 on the side surface 4, the sprue 30 flows the uncured rubber-forming composition into the mold. It is one rubber-like elastic body formed in the main flow path. The primary runner 31 is a single rubber-like elastic body formed by a horizontal flow path extending in the horizontal direction in order to branch the rubber-forming composition in three directions toward the top surface 2 and both side surfaces 4. . The top surface primary gate 32 is a single rubber-like elastic body that is formed directly below the sprue 30 with the primary runner 31 interposed therebetween and extends substantially vertically downward toward the top surface 2. In this embodiment, the top surface primary gate 32 is one, but two or more may be formed. The two side primary gates 33 are rubber-like elastic bodies that are formed on substantially both ends of the primary runner 31 on both sides of the top primary gate 32 and extend substantially vertically downward. In this embodiment, the side primary gate 33 is formed longer than the top primary gate 32 substantially vertically downward. However, the length relationship between the side primary gate 33 and the top primary gate 32 is not limited to this. Here, “sprue” means a part formed in a space from the part in contact with the nozzle of the injection molding machine to the runner. “Runner” means a space formed between the sprue and the gate or between the gates. The “gate” means a member formed in a space immediately before flowing an uncured material into the cavity. The “flow path” is a space in which a sprue, gate, or runner can be formed, and is distinguished from a sprue, gate, or runner.

  The secondary runner gate body 22 has a substantially horizontal disk-shaped secondary runner 34 connected to the lower end of each side primary gate 33 and an angle θ (see FIG. 3) from the secondary runner 34. 4, and a secondary gate 35 extending toward 4. The secondary runner 34 is a rubber-like elastic body formed in a space in which the uncured rubber forming composition flowing from the side primary gate 33 is temporarily stored and passed to the secondary gate 35. The secondary gate 35 is a rubber-like elastic body formed by flowing the rubber-forming composition that has passed through the secondary runner 34 toward the side surface 4.

  As shown in FIG. 3, in the primary gate 32 for the top surface, preferably, the outer diameter D1 of the portion near the primary runner 31 is larger than the outer diameter D2 of the portion closer to the top surface 2 side than that portion. When the primary gate 32 for the top surface is formed in such a form that the diameter is reduced from the primary runner 31 side toward the top surface 2 side (for example, inverted cone shape, inverted pyramid shape) so that D1> D2. It becomes easy to pull out the surface primary gate 32 to the side opposite to the top surface 2. Moreover, in the primary gate 33 for side surfaces, the outer diameter D3 of the site close to the primary runner 31 is preferably larger than the outer diameter D4 of the site closer to the secondary runner 34 than that site. When the side primary gate 33 is formed so that the diameter decreases from the primary runner 31 side to the secondary runner 34 side so that D3> D4, the side primary gate 33 is opposite to the top surface 2. It becomes easy to pull out. As a result, the entire primary runner gate body 21 can be easily pulled out toward the side opposite to the top surface 2. Therefore, after the insert molding, the primary runner gate body 21 can be easily excluded from the block constituting the mold.

  The outer diameter D5 of the secondary runner 34 is preferably larger than the outer diameter of the secondary gate 35 connected to the secondary runner 34. Thus, when the outer diameter D5 of the secondary runner 34 is formed, there are the following advantages. When the block that forms the secondary runner 34 is configured to be slidable with respect to another block that forms the primary gate 33 for the side surface, even when the positions of both blocks are not always the same, the uncured rubber The forming composition can be smoothly flowed toward the side surface 4 without interruption between both blocks. The outer diameter D5 of the secondary runner 34 is preferably larger than the outer diameter D4 of the lower end of the side primary gate 33. When the outer diameter D5 of the secondary runner 34 is formed in this way, the primary runner gate body 21 and the secondary runner gate body 22 are easily separated from each other at the boundary between the secondary runner 34 and the side primary gate 33. be able to. Further, in the secondary gate 35, the outer diameter D6 of the part close to the secondary runner 34 is preferably larger than the outer diameter D7 of the part closer to the side surface 4 than the part. When the secondary gate 35 is formed in such a form that the diameter decreases from the secondary runner 34 side toward the side surface 4 side (for example, inverted cone shape, inverted pyramid shape) so that D6> D7, It becomes easy to pull out 35 upwards. As a result, the entire secondary runner gate body 22 can be easily pulled upward. Therefore, it becomes easy to easily remove the secondary runner gate body 22 from the block constituting the mold after the insert molding.

  Here, the secondary gate 35 preferably has an obtuse angle with respect to the center line PQ in the substantially vertical direction of the side primary gate 33 (angles: θ and θ are 90). It is connected to the secondary runner 34 so as to make an angle greater than 180 degrees and smaller than 180 degrees. As a result, the uncured rubber forming composition can smoothly flow from the side primary gate 33 to the side 4 via the secondary gate 35.

  FIG. 4: shows the perspective view for demonstrating the process of inserting an insert molded product in the metal mold | die for insert molding which concerns on this embodiment. FIG. 5 shows a longitudinal sectional view of an insert molding die for explaining the process of FIG.

  An insert molding die 70 according to this embodiment is a die having a slidable block in a block that is clamped in one direction, and includes an upper block 40, a lower block 50 facing the upper block 40, In an area sandwiched between the upper block 40 and the lower block 50, it can slide in a direction different from the direction of clamping the upper block 40 and the lower block 50 (here, downward (substantially vertical downward) in FIG. 4). Two slide blocks 60. Between the upper block 40, the lower block 50, and the two slide blocks 60, two cavities (a part of the cavities 68a and the other cavities 68b) formed by inserting the insert molded product 1 described above are inserted. Exists. A part of the cavities 68 a and the other cavities 68 b are collectively referred to as a cavity 68. In this embodiment, the slide block 60 is a pair of blocks that are slidable in both directions toward and away from the insert molded product 1. Further, the insert molding die 70 is formed through the upper block 40, and up to a part of the cavities 68a and the other cavities 68b is another material in an uncured state different from the insert molded product 1 (here, One primary flow path 41 and two primary flow paths 42 through which an uncured rubber forming composition) can flow. Further, the insert molding die 70 is formed through each of the two slide blocks 60, and is in an uncured state from the inner opening (here, the lower opening) of the primary flow path 42 to the other cavity 68b. Each having one secondary flow path 63 through which the rubber forming composition can flow. In this embodiment, the secondary flow path 63 is bent from the primary flow path 42 to form a submarine gate formed inside the slide block 60.

  The upper block 40 includes a concave portion 43 that is recessed inward of the block on the inner surface facing the top surface 2 of the insert molded product 1. The concave portion 43 is formed in a form that can cover the upper portion including the top surface 2 of the insert molded product 1. A space sandwiched between the recess 43 and the top surface 2 forms a part of the cavity 68a. The primary flow path 41 is located between the two primary flow paths 42 when viewed from the upper surface side of the upper block 40, extends in the thickness direction (substantially vertical direction) of the upper block 40, and penetrates to the recess 43. Is formed. The two primary flow paths 42 extend in the thickness direction (substantially perpendicular direction) of the upper block 40 and are formed so as to penetrate to the lower surface of the upper block 40 at a position away from the recess 43. The primary flow path 41 is a flow path capable of forming the primary gate 32 for the top surface, and is a space formed in the shape of a substantially inverted cone or a substantially inverted pyramid from the upper surface of the upper block 40 to the recess 43. The primary flow path 42 is a flow path in which the side primary gate 33 can be formed, and is a space formed in the shape of a substantially inverted cone or a substantially inverted pyramid from the upper surface to the lower surface of the upper block 40.

  The lower block 50 includes a protrusion 51 that can be inserted into the inner space 7 of the insert-molded product 1. The base portion of the protruding portion 51 may be provided with a stepped portion 52 that slightly expands in the outer peripheral direction. When the insert molded product 1 is inserted and disposed in the protruding portion 51, the stepped portion 52 contacts the stepped portion 8 formed to slightly expand in the outer peripheral direction on the inner opening side of the insert molded product 1.

  The two slide blocks 60 are blocks that are slidable in both a direction approaching and a direction away from the insert molded product 1 inserted and disposed in the protruding portion 51 in a region sandwiched between the upper block 40 and the lower block 50. That is, the slide block 60 is slidable in a direction (substantially horizontal direction) perpendicular to the mold clamping direction (substantially vertical direction) between the upper block 40 and the lower block 50. The two slide blocks 60 are in contact with each other at a position closest to the insert molded product 1 inserted and disposed in the protruding portion 51, and are in an uncured state between the inner side 61 of the slide block 60 and the insert molded product 1. A space capable of supplying the rubber forming composition is formed. This space is another cavity 68b separated from a part of the cavity 68a on the top surface 2 side, and is in contact with the side surface 4 of the insert-molded product 1. The slide block 60 includes a recess 62 that is recessed inwardly on the surface on the upper block 40 side (the upper surface in FIG. 5). Further, the slide block 60 includes a secondary flow path 63 that communicates with the recess 62 and extends from the recess 62 toward the inner surface 61. The recess 62 is an area where the secondary runner 34 can be formed. The secondary channel 63 is a channel capable of forming the secondary gate 35. The recess 62 is preferably formed with a larger diameter than the primary flow path 42 and the secondary flow path 63. That is, the slide block 60 preferably includes a recess 62 having a larger diameter than either the primary flow path 42 or the secondary flow path 63 on the contact surface with the upper block 40 including the primary flow path 42.

  The secondary flow path 63 is a space formed in the shape of a substantially inverted cone or a substantially inverted pyramid from the recess 62 to the inner surface 61. The slide block 60 is provided with a convex portion 64 that protrudes toward the concave portion 6 at a portion facing the concave portion 6 formed on the side surface 4 of the insert molded product 1 on the inner surface 61 thereof. At the time of insert molding, the convex portion 64 faces the concave portion 6 of the insert molded product 1 with a gap. The uncured rubber forming composition enters the gap and forms the rubber-like elastic layer 16 on the surface of the recess 6. In this embodiment, one convex portion 64 is formed on each inner surface 61 of both slide blocks 60, and faces one concave portion 6 formed on each side surface 4 of the insert molded product 1. However, when one recess 6 is provided in a part of the side surface 4 of the insert-molded product 1, only one protrusion 64 is provided at a position facing the recess 6 in the inner surface 61 of one slide block 60. Can be provided.

  When the insert molded product 1 is set in the lower block 50 and each slide block 60 is slid from both sides in the horizontal direction and moved to the position closest to the insert molded product 1, only the upper part from the peripheral edge 3 of the insert molded product 1 can be seen. It protrudes from above the slide block 60. The upper block 40 is moved so as to cover the concave portion 43 of the upper block 40, and the upper block 40 and the lower block 50 are clamped. After the mold clamping, the primary flow path 41 leads to the top surface 2 through the recess 43. Each primary flow path 42 is connected to the secondary flow path 63 via the recess 62 of each slide block 60, and reaches the side surface 4 of the insert molded product 1. Thus, the preparation for insert molding is completed.

  FIG. 6: shows the perspective view for demonstrating the process after inserting an insert molded product in the metal mold | die for insert molding which concerns on this embodiment until taking out a composite molded object. FIG. 7 is a longitudinal sectional view of an insert molding die for explaining the first half of the step of FIG. FIG. 8 is a longitudinal sectional view of an insert molding die for explaining the process following FIG.

  After the insert molding die 70 is clamped, an uncured rubber-forming composition is supplied from the uppermost block (not shown) disposed further above the upper block 40. As a result, the rubber-forming composition branches from the uppermost block into the primary flow path 41 and the primary flow path 42 of the upper block 40. The rubber-forming composition that has passed through the primary flow path 41 reaches the top surface 2 via the recess 43. The rubber-forming composition that has passed through the primary flow path 42 reaches the side surface 4 through the recess 62 and the secondary flow path 63. Thereafter, the rubber forming composition is vulcanized and cured. After the rubber forming composition is cured, when the uppermost block is removed, the insert molding die 70 is in the state on the left side of FIG. 6 and the upper side of FIG. Since the uppermost block has flow paths that can form the sprue 30 and the primary runner 31, respectively, the sprue 30 and the primary runner 31 protrude from the upper portion of the insert molding die 70 in a state where the uppermost block is removed. ing.

  When mold clamping of the upper block 40 and the lower block 50 is released and the upper block 40 is moved upward, the primary runner gate body 21 and the secondary runner gate body 22 are separated. More specifically, the joint between the side primary gate 33 and the secondary runner 34 is broken, and the primary runner gate body 21 moves together with the upper block 40. Thereafter, the primary runner gate body 21 is removed from the upper block 40 by pulling the primary runner gate body 21 upward from the upper block 40. Since the primary flow paths 41 and 42 are both configured to have a diameter that decreases from the upper surface to the lower surface of the upper block 40, the top surface primary gate 32 and the side surface primary gate 33 are both The upper block 40 has a shape whose diameter decreases from the upper surface toward the lower surface. As a result, as shown in FIG. 7, the primary runner gate body 21 can be easily lifted from the upper block 40.

  On the upper surface of the slide block 60 (that is, the contact surface with the upper block 40), there is a rubber-like elastic body layer 12 formed on the top surface 2 of the composite molded body 10 and a secondary runner 34 filling the recess 62. Exposed. From this state, when the slide block 60 is slid in the horizontal direction so as to be separated from the composite molded body 10, the insert molding die 70 has the composite molded body 10 on the lower block 50. The inside of the slide block 60, specifically, the recess 62 and the secondary flow path 63 are filled with the secondary runner / gate body 22. The outer diameter of the secondary runner 34 is larger than the outer diameter of the secondary gate 35. The outer diameter of the secondary gate 35 on the secondary runner 34 side is larger than the outer diameter on the side surface 4 side. For this reason, as shown in FIG. 8, the secondary runner / gate body 22 can be easily pulled out above the slide block 60. Subsequently, the composite molded body 10 is removed from the protruding portion 51 of the lower block 50, and the insert molding ends.

  FIG. 9 is a flowchart for explaining the flow of main steps of the insert molding method according to this embodiment.

  The insert molding method according to this embodiment is a method for inserting the insert molded product 1 and molding another material on the surface of the insert molded product 1, and includes an upper block 40, a lower block 50, and 40, 50, and a plurality of slide blocks 60 that are slidable in a direction different from the clamping direction of the 40, 50, and between the upper block 40, the lower block 50, and the plurality of slide blocks 60. Two cavities 68 (partial cavities 68a and other cavities 68b) formed by inserting the insert molding 1 and part cavities 68a and other cavities 68b formed through the upper block 40. Since another uncured material (as an example, an uncured rubber forming composition) is allowed to flow Three primary flow paths 41, 42, and 42, and a rubber-forming composition that is formed through the slide block 60 and is uncured from the inner opening (lower opening) of the primary flow path 42 to another cavity 68b. This is a molding method that is performed using an insert molding die 70 including two secondary flow paths 63 that can flow.

  This insert molding method includes an insert step (step 110) for inserting the insert molded product 1 into the insert molding die 70, and a slide step (step 120) for sliding the two slide blocks 60 toward the insert molded product 1. A mold clamping step (step 130) for clamping between the upper block 40 and the lower block 50, and a part of a plurality of areas separated from the primary flow path 41 on the surface of the insert molded product 1 An uncured rubber-forming composition is supplied toward a certain top surface 2, and the partial region (top surface 2) on the surface of the insert-molded product 1 through the secondary channel 63 from the primary channel 42. ) (Step 140) for supplying an uncured rubber-forming composition toward the region (side surface 4) other than), and the uncured rubber sheet. Comprising curing step of curing the composition for forming (step 150), the. Thereafter, the insert molding die 70 is opened, and the composite molded body 10 is taken out (step 160).

  In this embodiment, the insert-molded product 1 is a housing that is open on one side and closed on the opposite side. In the supplying step (step 140), an uncured rubber-forming composition is supplied from the primary channel 41 to the top surface 2 which is the closed surface of the casing, and from the primary channel 42 to the secondary channel. Step 63 is a step of supplying an uncured rubber forming composition to the side surface 4 of the casing through 63.

  The insert-molded product 1 is mainly made of a thermoplastic resin, and a material covering the top surface 2 and the side surface 4 is a rubber-like elastic body, particularly silicone rubber. However, you may comprise the insert molded product 1 from a thermosetting resin. The material covering the top surface 2 and the side surface 4 may be a rubber-like elastic body other than silicone rubber, and may be a thermoplastic resin or a thermosetting resin different from the insert molded product 1.

<Other embodiments>
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made.

  The clamping direction of the insert molding die 70 is not limited to the vertical direction, and may be another direction such as a horizontal direction. The number of slide blocks 60 is two in the above-described embodiment, but may be three or more. Further, only one slide block 60 may be provided, and the insert molded product 1 may be sandwiched between the fixed block and the slide block 60. In that case, you may form the secondary flow path 63 not only in the slide block 60 but in a fixed block. Moreover, you may form the recessed part 62 in a fixed block. When three or more slide blocks 60 are used, for example, in addition to the two slide blocks 60 that slide on the X axis perpendicular to the clamping direction, two slide blocks that slide on the Y axis are also prepared. The insert molded product 1 may be surrounded by a total of four slide blocks.

  The movable direction of the slide block 60 is not limited to the direction orthogonal to the mold clamping direction, and may be any direction such as a direction that forms an acute angle of less than 90 degrees with the mold clamping direction. The primary flow paths 41 and 42 may be formed through the lower block 50. Moreover, in the said embodiment, although the secondary flow path 63 is a flow path which can form the secondary runner gate body 22 as an example of a submarine gate, it forms the non-submarine gate which also exposes parts other than both ends. Possible flow paths may be used. Further, the recess 62 is not an essential configuration, and the secondary block 63 directly connected to the side primary gate 33 may be provided without providing the recess 62 in the slide block 60.

  The insert molded product 1 does not have to be a housing having an opening on one side and a closed surface on the opposite side. The insert molded product 1 may be a molded product that is solid and does not dent inward. In addition, the insert molded product 1 is a molded product having a shape that spreads from the upper part to the lower part, and a molded product that has a shape that spreads from the middle to the middle in the height direction and narrows from the middle. May be. When an insert molded product having such a form is inserted into the insert molding die 70, it is difficult to insert with the type in which the mold is clamped in the vertical direction, and it is necessary to provide at least one slide block 60. is there. The present invention is particularly effective for molding that requires the slide block 60. Further, in the above-described embodiment, another material in an uncured state is supplied only to the outer surface of the insert molded product 1, but through an opening formed inward from the opening of the insert molded product 1 or from the outside. It can also be supplied to the inside of the insert molded product 1. For example, a rubber-like elastic body layer may be formed through the secondary flow path 63 not only on the outside of the insert molded product 1 but also on the inside, or on the inside instead of the outside. The number of cavities 68 is not limited to two, but may be three or more.

  The present invention can be used, for example, in insert molding in which two or more regions of a molded product are coated with another material.

1 Insert molded product (molded product, housing)
2 Top surface (part of multiple separated areas)
4 Sides (areas other than some areas)
10 Composite molded body 22 Secondary runner gate body (submarine gate)
40 Upper blocks 41, 42 Primary flow path 50 Lower block 60 Slide block 62 Recess 63 Secondary flow path 68 Cavity 68a Some cavities 68b Other cavities 70 Insert molding mold

Claims (3)

An insert molding method for inserting a molded product, which is a housing having an opening on one side and a closed surface on the other side, and molding another material on the surface of the molded product,
The upper block,
A lower block facing the upper block;
One or a plurality of slide blocks in a region sandwiched between the upper block and the lower block and slidable in a direction different from the direction of mold clamping between the upper block and the lower block;
At least two separate cavities formed between the upper block, the lower block, and the one or more slide blocks, and formed by inserting the molded article;
One or more primary flow paths formed through the upper block or the lower block and capable of flowing the another material in an uncured state to a part of the cavities;
One or more secondary flow paths formed through at least one of the slide blocks and capable of flowing the other uncured material from the inner opening of the primary flow path to the other cavities;
Use an insert mold with
An insert step of inserting the molded product into the insert molding die;
A sliding step of sliding at least one of the plurality of slide blocks toward the molded article;
A mold clamping step of clamping between the upper block and the lower block;
The other material in the uncured state is supplied to a part of the cavities from the primary flow path, and the uncured state in the other cavities from the primary flow path to the other cavities. A supply step of supplying another material;
A curing step of curing the another material in the uncured state;
Only including,
In the supplying step, the other material in the uncured state is supplied from the primary flow path to the closed surface of the casing, and from the primary flow path through the secondary flow path, the casing An insert molding method, which is a step of supplying the uncured material to the side surface of the material . The molded article mainly comprises a thermoplastic resin or a thermosetting resin,
It said another material, insert molding method according to claim 1 is a rubber-like elastic material. The insert molding method according to claim 2 , wherein the another material is silicone rubber.

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