JP4669570B1 - Method for manufacturing casing provided with sealing member - Google Patents

Abstract

Provided is a method for manufacturing a casing having a sealing member that can reduce the manufacturing process of the casing having a sealing member, improve productivity, and suppress an increase in mold cost. To do.
SOLUTION: A first material is injected into a space formed by overlapping a movable side mold and a first fixed side mold 10 to form a casing 100, and the casing is attached to the movable side mold. In a state where 100 is held, the first fixed mold 10 is separated from the movable mold. Next, the movable mold holding the casing 100 is moved to a position facing the second fixed mold, and the movable mold and the second fixed mold are overlapped to form a space. Then, the second material is injected, and a seal member is formed on the housing held by the movable mold.
[Selection] Figure 1

Description

  The present invention relates to a method for manufacturing a housing having a seal member.

  In general, a housing of an electronic device such as a mobile phone is composed of an upper housing and a lower housing, and a sealing member is provided on the joint surface of the lower housing with the upper housing for the purpose of waterproofing. And this seal member is elastically deformed between the joint surfaces of the upper casing, and the lower casing is attached to the upper casing.

  The casing provided with the seal member is manufactured by separately molding the seal member and the casing and assembling the seal member to the seal attachment portion of the casing.

  Patent Document 1 describes a method of manufacturing by so-called insert molding in which a casing molded in advance with a dedicated mold is placed in another mold and a sealing member is molded at a desired position of the casing. ing. Thus, by molding the seal member into the casing by insert molding, the work of assembling the seal member to the casing can be eliminated, and productivity can be improved.

  However, in the case of insert molding, since it has a process of taking out a case molded with a dedicated die from the die and setting it in another die, the productivity of the case provided with the seal member is sufficient. Could not improve. Further, at least two or more molds for molding the casing and two or more molds for insert molding are required, and there is a problem that the mold cost increases.

  The present invention has been made in view of the above background, and the object thereof is to reduce the manufacturing process of a housing having a seal member, to improve productivity, and to suppress an increase in mold cost. It is providing the manufacturing method of the housing | casing provided with the sealing member which can be performed.

In order to achieve the above object, according to the first aspect of the present invention, a casing is formed by injecting a molten first material into a space formed by overlapping a moving mold and a first mold. A step, a step of separating the first mold from the moving mold in a state where the casing is held by the moving mold, and a position facing the second mold for molding the seal member, Injecting the molten second material softer than the first material into a space formed by overlapping the moving mold, the moving mold, and the second mold, Forming a seal member on a housing held by the moving mold, and for injecting a second material into a space formed by overlapping the moving mold and the second mold A plurality of gate portions, the second material flowing from the gate portion with the second mold, and the gate portion Portion flowing from fit gate portion and the second material intersect and in a portion other than the seal portion of the seal member is obtained by forming an overflow section, the surface facing the said first mold the movable mold side Slidably provided at a position facing the part of the housing when at least the first mold is separated from the movable mold, and the first mold is separated from the movable mold. A counter member that holds the casing on the movable mold when separating is provided, and a seal member is formed on the casing held on the movable mold, and then retracted from the counter position so as not to face the casing. After sliding the facing member to a position, the second mold is pressed in a state where a casing formed with a seal member is pressed against the second mold by a movable pressing pin provided on the movable mold side. Move away from the moving mold It is characterized in.
Further, the invention of claim 2 uses a non-crystalline material as the first material and a thermoplastic elastomer as the second material in the method for manufacturing a housing having the seal member of claim 1. It is characterized by this.
The spacing, the invention of claim 3, in the manufacturing method of a housing with a seal member according to claim 1 or 2, provided in the upper Symbol first mold side, said first die from said moving mold And a pressing means that presses the casing against the movable mold side.
The invention of claim 4 is the method for manufacturing a housing having a 請 Motomeko 1 to 3 or of the sealing member, the upper Symbol second mold side, a seal member formed from the second mold It is characterized in that a take-out means for taking out the housing is provided.
The invention of claim 5 is a method of manufacturing a casing provided with the seal member according to any one of claims 1 to 4 , wherein the inner peripheral surface of the casing is molded by a first mold. To do.

According to the present invention, since a common moving mold is used in the step of molding the casing and the step of molding the seal member, the mold cost is suppressed as compared with the manufacturing method described in Patent Document 1. be able to. Further, after the casing is molded, the seal member can be molded at a predetermined position of the casing by moving the movable mold holding the casing to a position facing the second mold. Thereby, the process which removes the shape | molded housing | casing from a metal mold | die and sets to another metal mold | die can be eliminated, and productivity can be improved.
Further, according to the present invention, since the sealing member is formed on the casing after the casing is molded, the following effects can be obtained as compared with the case where the casing is molded on the sealing member after the sealing member is molded. Can be obtained. That is, when the casing is molded after the sealing member is molded, the sealing member held by the moving mold is deformed by the injection pressure. As a result, a gap is generated between the moving mold and the seal member, and there is a possibility that a so-called fog is generated in which a material for forming the casing flows. On the other hand, the housing is formed of a first material harder than the seal member. For this reason, the shape | molded housing | casing can suppress the deformation | transformation by an injection pressure rather than a sealing member. Therefore, fogging can be suppressed by molding the casing and then molding the seal member on the casing.

1 is a schematic configuration diagram of a two-color molding machine according to an embodiment. The perspective view of the housing | casing provided with the sealing member shape | molded by this two-color molding machine. The figure which shows the state which the movable mold part and the fixed mold part spaced apart. The figure which shows the state which removes a finished product from a 2nd stationary-side metal mold | die with an ejector pin in a secondary shaping | molding part. The figure explaining resin fogging. The block diagram which shows a part of electric circuit in a two-color molding machine. Control flowchart of two-color molding machine The top view of the housing | casing provided with the sealing member shape | molded with the two-color molding machine of a modification. The top view of the primary molded product (housing | casing) shape | molded by a primary molding part. The top view of the secondary molded product (sealing member) shape | molded by a secondary molding part. The cross-sectional perspective view of the housing | casing provided with the sealing member. The figure explaining the process in the primary molding part of the two-color molding machine of a modification. The figure explaining the process in the secondary molding part of the two-color molding machine of a modification. The partial expanded sectional view around the 2nd fixed side metal mold | die. The block diagram which shows a part of electric circuit in the two-color molding machine of a modification. (A) is a control flowchart of a primary molding part, (b) is a control flowchart of a secondary molding part. The top view of the movable side part after the primary molded product shaping | molding in the structure which provided multiple sliders. The top view of the movable side part after the secondary molded product shaping | molding in the structure which provided multiple sliders.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of the two-color molding machine 1, and FIG. 2 is a perspective view of a housing 100 including a seal member 101 molded by the two-color molding machine 1.
As shown in FIG. 2, the casing 100 provided with the seal member 101 has a recessed space that opens upward, and the seal member 101 is formed on the opening end surface around the opening. The casing is made of an amorphous material such as ABS resin (acrylonitrile / butadiene / styrene resin), PC resin (polycarbonate resin), or PC / ABS polymer alloy. The seal member is formed of a thermoplastic elastomer (TPE) such as a polyester-based thermoplastic elastomer.

  A circuit board (not shown) or the like is accommodated in the recessed space of the housing 100 provided with the seal member, and the seal member is crushed by the joint surface of the upper housing (not shown) provided with a display unit and an operation unit The upper housing is attached to the housing having a seal member.

As shown in FIG. 1, the two-color molding machine 1 includes a primary molding unit 2 and a secondary molding unit 3.
The primary molding part 2 has a first fixed side part 4a, and the secondary molding part 3 has a second fixed side part 4b. In addition, the two-color molding machine 1 is provided with two movable side portions 5a and 5b installed on a turntable (not shown). In the figure, the first movable side portion 5a is the first fixed side portion 4a. The second movable side part 5b is opposed to the second fixed side part 4b. The first movable side portion 5a and the second movable side portion 5b have the same configuration.

  The first fixed side portion 4a includes a mold plate 6a, a pressing mechanism 7a, a runner plate 8a, a sprue rate 9a, and the like. On the mold plate 6a, a first fixed mold 10 as a first mold having a casing molding portion for casing molding is set. The pressing mechanism 7a, which is a holding unit and is a pressing unit, includes a pressing plate 71a, a cylinder 73a, a pressing pin 72a, and the like. The pressing plate 71a is disposed with a predetermined gap at the upper part of the first fixed mold 10 in the drawing. The pressing pin 72a is inserted into a through hole formed in the first fixed side mold 10, one end is fixed to the pressing plate 71a, and the other end is to the housing molding part of the first fixed side mold. Facing. At both ends of the pressing plate 71a in the figure, pneumatic cylinders 73a fixed to the mold plate 6a are attached. The pressing plate 71a is pressed toward the first movable side portion 5a by a plurality of springs 16a disposed between the pressing plate 71a and the runner plate 8a.

  A runner plate 8a is provided on the upper portion of the pressing plate 71a in the drawing via a plurality of springs 16a. The runner plate 8a has a through portion 81a that penetrates the pressing plate 71a. The runner plate 8 a is formed with a runner 18 a that is a flow path for pouring the molten material into the first fixed mold 10. The runner 18 a passes through the through-hole 81 a and passes through the first fixed mold 10. It is connected to the runner 17a.

  A sprue plate 9a is provided in the upper portion of the runner plate 8a in the figure, and a sprue portion 14a having a sprue 15a is incorporated in the sprue plate 9a. The sprue rate 9a includes a first plate 91a and a second plate 92a, and the first plate 91a and the second plate 92a are configured to be able to contact and separate. The inlet of the sprue 15a is connected to a nozzle of an unillustrated injector that injects the molten material, and the outlet of the sprue 15a is connected to a runner 18a formed on the runner plate 8a.

  The first fixed side portion 4a is configured to be able to contact and separate with respect to the opposed movable side portion, and the sprue plate 9a is configured to be able to contact and separate from the runner plate 8a.

  The second fixed side portion 4b has the same configuration as the first fixed side portion 4a except for the following points. That is, the mold set on the mold plate 6b is the second fixed side mold 20 as a second mold for molding the seal member 101. There is no pressing mechanism 7a, and there is provided an ejector mechanism 7b which is a take-out means for taking out a product from the second fixed mold 20. Runners 17b, 18b and sprue 15b have different shapes. In addition, the ejector mechanism 7b of the second fixed side portion 4b includes an ejector plate 71b, a cylinder 73b, an ejector pin 72b, and the like. The ejector plate 71b is disposed with a predetermined gap with respect to the second fixed mold 20. The ejector pin 72b is inserted into a through-hole formed in the second fixed-side mold 20, one end is fixed to the ejector plate 71b, and the other end forms a seal member of the second fixed-side mold 20. Facing the sealing member molding part. A pneumatic cylinder 73b fixed to the mold plate 6b is attached to both ends of the ejector plate 71b in the drawing.

  The first and second movable side portions 5a and 5b installed on a turntable (not shown) have mold holding portions 11a and 11b, movable side dies 12a and 12b as movable dies, and the like. Movable molds 12a and 12b are set on the upper surfaces of the mold holders 11a and 11b in the drawing.

  In FIG. 1, the fixed side portions 4a and 4b are arranged above the movable side portions 5a and 5b from the viewpoint of easy understanding of the apparatus, but FIG. 1 is rotated by 90 °. Configuration, that is, a configuration in which the primary molding portion 2 and the secondary molding portion 3 are arranged in parallel, and the mold opening and closing are performed by moving each fixed side portion horizontally with respect to each movable side portion. This is a general configuration.

  FIG. 6 is a block diagram showing a part of an electric circuit in the two-color molding machine 1. In the figure, a control unit 200 serving as a control unit controls the entire two-color molding machine, and includes a CPU that is a calculation unit, a RAM and a ROM that are recording units. The control unit 200 is connected to a first plate driving unit 201a that moves each plate (the mold plate 6a, the runner plate 8a, and the sploop rate 9a) of the first fixed side portion 4a. Further, a pressing mechanism driving unit 202a for moving the pneumatic cylinder 73a of the pressing mechanism 7a, a first injection unit 203a for injecting the first material, and the like are also connected. The first plate driving unit 201a includes a moving unit that moves only the sprue plate 9a and a moving unit that moves the mold plate 6a and the runner plate 8a as a unit. Further, the control unit 200 is connected to a second plate driving unit 201b that moves each plate (the mold plate 6b, the runner plate 8b, and the sploop rate 9b) of the second fixed side portion 4b. Further, an eject mechanism driving unit 202b for moving the pneumatic cylinder 73b of the ejector mechanism 7b, a second injection machine 203b for injecting the second material, and the like are also connected. Further, the second plate driving unit 201b includes a moving unit that moves only the sprue plate 9b, and a moving unit that moves the mold plate 6b and the runner plate 8b integrally. The control unit 200 is also connected to a turntable driving unit 204 that rotates a turntable (not shown).

Next, the molding process will be described with reference to FIGS.
First, the process in the primary molding part will be described.
As shown in FIG. 1, the control unit 200 controls the first injection machine 203a to form a first material (amorphous) that is a material for molding the melted casing 100 from a nozzle (not shown) of the first injection machine 203a. Material) is injected into the sprue 15a. In this embodiment, as the first material, PC / ABS polymer alloy Multilon D-3410FA (manufactured by Teijin Chemicals Ltd.) was used. The first material injected into the sprue 15a was constituted by the housing molding part of the first movable mold 12a and the casing molding part of the first fixed mold 10 via the runners 18a and 17a. The space 100 is filled and the casing 100 which is a primary molded product is molded.

  Next, the control part 200 controls the 1st plate drive part 201a, and moves the sprue rate 9a in the direction away from the runner plate 8a. Thereby, the housing | casing 100 and the sprue runner part S1 space apart, and the sprue runner part S1 is exposed. Further, the second plate 92a of the sprue rate 9a is separated from the first plate 91a to facilitate removal of the sprue runner portion S1. Next, the control unit 200 controls the pressing mechanism driving unit 202a so that the cylinder 73a presses the pressing plate 71a against the springs 16a against the runner plate 8a, and the cylinder 73a presses the pressing plate 71a. 71a is switched to the air pressure that draws toward the first fixed mold 10 side. Thereby, the molded housing 100 is pressed against the first movable mold 12a by the pressing pin 72a. Next, the control unit 200 controls the first plate driving unit 201 a to move the mold plate 6 a and the runner plate 8 a in a direction away from the first movable side mold 12. When the mold plate 6a moves and the first fixed mold 10 starts to move away from the first movable mold 12a, the pressing pin 72a applies the pressing force of the plurality of springs 16a and the pressing plate 71a to the first. The casing 100 protrudes from the first fixed side mold 10 by the force of the cylinder 73a moved to the fixed side mold 10 side, and presses the housing 100 against the first movable side mold 12a. Thereby, the housing | casing 100 is hold | maintained at the 1st movable side metal mold | die 12a (refer FIG. 3).

Next, as shown in FIG. 4, the control unit 200 controls the pressing mechanism driving unit 202a to switch the air pressure of the pneumatic cylinder 73a to the air pressure at which the cylinder 73a presses the pressing plate 71a toward the runner plate. The plate 71a is brought into contact with the runner plate 8a. Next, air blow etc. are given and the sprue runner part S1 is removed.
The above is the process in the primary molding part 2.

Next, the process in the secondary shaping part 3 is demonstrated.
First, the control unit 200 controls the second injection machine 203, and as shown in FIG. 1, the first material melted in the primary molding unit 2 is injected into the sprue 15a substantially in synchronism with the second material. A second material (thermoplastic elastomer) melted from a nozzle (not shown) of the injection machine 203b is injected into the sprue 15b. In this embodiment, Primalloy A1600N (manufactured by Mitsubishi Chemical Corporation), which is a polyester thermoplastic elastomer, was used as the second material. The second material injected into the sprue 15b is constituted by the casing 100 held by the second movable side mold 12b and the seal member molding portion of the second fixed side mold 20 via the runners 18b and 17b. The filled space is filled. Thereby, the seal member 101 is molded at a predetermined position of the housing 100. Thereby, the housing | casing 100 (henceforth a completed product) provided with the sealing member 101 which is a secondary molded product is shape | molded.

  Next, the control unit 200 controls the second plate driving unit 203b to move the sploop rate 9b in a direction away from the runner plate 8b. As a result, as shown in FIG. 3, the sprue runner part S2 and the finished product are separated and the sprue runner part S2 is exposed. Next, the mold plate 6b and the runner plate 8b are moved away from the second movable mold 12b. At this time, the finished product is held by the second fixed side mold 20 and separated from the second movable side portion 5b together with the second fixed side portion 4b.

Next, when a jig for holding the finished product is inserted between the second fixed side portion 4b and the second movable side portion 5b, the control unit 200, as shown in FIG. 202 b is controlled to switch the air pressure of the cylinder 73 b that has pressed the ejector plate 71 b toward the runner plate 8 a to the air pressure that draws the ejector plate 71 b to the second fixed mold 20. Then, the ejector plate 71b moves to the second fixed side mold 20 side by the cylinder 73b, and the ejector pins 72b protrude from the second fixed side mold 20. Thereby, the molded finished product is pushed toward the second movable side portion 5b by the ejector pin 72b. As a result, the finished product is removed from the second fixed mold 20, and the finished product is held by a jig and taken out from the apparatus. When the finished product is taken out from the secondary molding unit 3, the control unit 200 switches the air pressure of the pneumatic cylinder 73b to move the ejector plate 71a toward the runner plate 8b, and the ejector plate 71a contacts the runner plate 8a. Let And an air blow etc. are given and the sprue runner part S2 is removed.
The above is the process in the secondary molding part 3.

  If sprue runner part S1, S2 is removed in the primary shaping | molding part 2 and the secondary shaping | molding part 3, the control part 200 will rotate the rotary disk not shown, and will fix the 1st movable side part 5a to the 2nd fixation. The second movable side portion 5b is opposed to the first fixed side portion 4a. Then, the sprue plate 9a is brought into contact with the runner plate 8a, the first fixed side part 4a is moved to the second movable side part 5b, and the first fixed side mold 10 is superimposed on the second movable side mold 12b. In the same manner as described above, the casing is formed in the second movable mold at the primary molding unit. Further, the sprue rate 9b is brought into contact with the runner plate 8b. Moreover, the 2nd fixed side part 4b is moved to the 1st movable side part 5a, and the 2nd fixed side metal mold | die 20 is piled up on the 1st movable side metal mold | die 12a. And the housing | casing 100 provided with the sealing member 101 is shape | molded by a secondary shaping | molding part like the above-mentioned.

In the present embodiment, since the casing 100 is molded by the primary molding unit 2 and the sealing member 101 is molded by the secondary molding unit 3 on the casing 100, the resin fog can be suppressed. This will be specifically described below.
FIG. 5 is an enlarged view of the main part of the secondary molding unit 3 in a two-color molding machine configured to mold the seal member 101 in the primary molding unit 2 and mold the casing 100 on the seal member 101 in the secondary molding unit 3. It is a block diagram.
As shown in the figure, in the secondary molding portion 3, when the resin material is filled, the soft seal member 101 made of elastomer is deformed by pressure. As a result, a gap is formed between the movable mold 12 and the seal member 101, and the resin material for molding the casing 100 flows into the gap, and a resin fog occurs. The resin material for molding the casing 100 is a relatively hard resin such as ABS resin or PO resin. Therefore, when the finished product has such a resin cover, the resin cover prevents the seal member 101 from being crushed when an upper housing (not shown) is attached to the housing 100 including the seal member 101. End up. As a result, there arises a problem that sufficient sealing performance cannot be obtained.

  On the other hand, in the present embodiment, the casing 100 is molded by the primary molding unit 2. Therefore, when the secondary molding portion 3 is filled with an elastomer for molding the seal member 101, the casing 100 made of a relatively hard resin material such as ABS resin is not easily deformed by pressure. Thereby, at the time of shaping | molding in the secondary shaping | molding part 3, a clearance gap arises between the housing | casing 100 and a movable side metal mold | die, and it can suppress that an elastomer flows into there.

  In the present embodiment, the inner peripheral surface of the housing 100 is configured to be molded by the first fixed mold 10. With this configuration, the gate of the seal member 101 and the gate of the casing 100 can be easily set so as to be the inner peripheral surface of the casing 100. As a result, as shown in FIG. 2, the gate trace M2 of the seal member 101 and the gate trace M3 of the casing 100 become the inner peripheral portion of the casing 100 that is invisible, and the appearance of the finished product is prevented from being damaged. can do. Further, in the present embodiment, the finished product is held in the second fixed side mold, and an ejector mechanism 7b serving as a taking-out means is provided on the second fixed side portion 5b so that the finished product is taken out from the second fixed side mold 20. I have to. As a result, as shown in FIG. 2, an ejector pin mark M1 can be made on the inner peripheral surface of the housing, and the ejector pin mark can be kept out of sight and the appearance of the product is impaired. Can do.

  Further, when the inner peripheral surface of the housing 100 is configured to be molded by the first fixed mold 10, when the resin material is poured in the primary molding portion 2 and the resin material is cooled and hardened, the resin material shrinks, The housing 100 comes into close contact with the first fixed mold 10. As a result, the housing 100 may not be held by the movable mold 12 but may be held by the first fixed mold 10 when the casing is opened. However, in the present embodiment, the pressing mechanism 7a, which is a holding means, is provided in the first fixed side portion 4a, and the pressing pin 72a is used when the primary molding portion 2 opens the mold after the casing 100 is molded. Thus, the casing 100 is pressed against the movable mold 12. Thereby, the housing | casing 100 can be reliably hold | maintained at the movable mold 12. FIG.

FIG. 7 is a control flowchart of the two-color molding machine.
As shown in the figure, first, in the primary molding unit 2 and the secondary molding unit 3, the control unit 200 moves the mold plates 6a and 6b toward the movable side portions 5a and 5b to perform mold closing (S1). ). Next, the control part 200 inject | emits material from the 1st injection machine 203a and the 2nd injection machine 203b, respectively, and shape | molds a molded article in each shaping | molding part 2 and 3 (S2). Next, the control unit 200 controls the pressing mechanism driving unit 202a to switch the air pressure of the pneumatic cylinder 73a (S3). Next, the control unit 200 controls the first and second plate driving units 201a and 201b to perform the mold opening operation in each of the molding units 2 and 3 (S4). At this time, the air pressure of the cylinder 73a of the pressing mechanism 7a is switched from the air pressure that presses the pressing plate 71a toward the runner plate 8a to the air pressure that draws the pressing plate 71a toward the first fixed mold 10 side. Therefore, the pressing pin 72a protrudes from the first fixed side mold 10 by the pressing force of the plurality of springs 16a and the air pressure of the cylinder 73a, and the housing 100 is pressed against the first movable side mold 12a. Thereby, the housing 100 is held by the movable mold 12. Next, the control unit 200 controls the ejector mechanism driving unit 202b to switch the air pressure of the pneumatic cylinder 73b to project the ejector pin 71b and take out the finished product from the second fixed side mold 20 (S5). .

  In the present embodiment, the pressing mechanism 7a includes the pneumatic cylinder 73a, but may be configured without the pneumatic cylinder 73a. In this case, the pressing plate 71 passes through the first fixed mold 10 and the parting line of the movable mold 12 (of the surface of the movable mold 12 facing the first fixed mold 10, the housing Provide a return pin that abuts the surface other than the molding part. When the mold is closed, the return plate is pressed toward the runner plate 8a by the movable mold 12, so that the pressing plate 71a is in contact with the runner plate 8a. As a result, the tip of the pressing pin 72 a can face the housing molding part of the first fixed mold 10 without contacting the housing molding part of the movable mold 12. After the housing is molded, when the mold plate 6a moves and the first fixed mold 10 begins to move away from the first movable mold 12a, the pressing pins 72a and the return pins are moved by the pressing force of the plurality of springs 16a. The housing 100 protrudes from the first fixed mold 10 and presses the housing 100 against the first movable mold 12a with the pressing pin 72a. Even in such a configuration, when the movable mold 12 and the first fixed mold 10 are separated from each other, the casing 100 can be pressed against the movable mold 12 by the pressing pin 72a.

Next, a modified example of the present invention will be described.
FIG. 8 is a plan view of the housing 100 including the seal member 101 formed by the two-color molding machine according to the modification. FIG. 9 is a plan view of a primary molded product (housing 100) molded by the primary molding unit 2, and FIG. 10 is a plan view of a secondary molded product (seal member 101) molded by the secondary molding unit 3. FIG. FIG. 11 is a cross-sectional perspective view of the housing 100 provided with the seal member 101.
As shown in FIGS. 8 and 9, the housing 100 has a plurality of frame portions 102a for mounting components, a plurality of screwing portions 102c for screwing circuit boards and the like. As shown in FIGS. 8 and 11, an endless seal member 101 is formed along the inner wall surface of the outer frame of the housing 100. Further, as shown in FIG. 11, a seal portion 101 c for exerting a sealing property by an inclined surface on the outer side from the top of the seal member 101 coming into contact with the other housing (not shown) attached to the housing 100. It has become. Then, four gate portions 101a and four overflow portions 101b into which the second material (elastomer) flows finally are formed on the inner peripheral wall 101d of the seal member, which is a portion other than the seal portion 101c of the seal member 101. Yes. As shown in FIG. 8, the overflow portion 101b is formed at a location where the second material flowing in from the four gate portions 101a intersects.

Next, a modified two-color molding machine will be described.
FIG. 12 is a diagram illustrating a process in the primary molding unit 2 of the two-color molding machine according to the second modification, and FIG. 13 is a diagram illustrating a process in the secondary molding unit 3 of the two-color molding machine according to the modification. is there.

  As shown in FIGS. 12 and 13, each of the fixed side parts 4 a and 4 b of the two-color molding machine of this modification is provided with a plastic lock 19 for fixing the mold plate 6 to the movable side part 5. The plastic lock 19 is attached to the runner plate 8. As shown in FIGS. 12A and 13A, when the mold is closed, the tip of the plastic lock 19 is inserted into a concave locked portion provided on the movable mold plate 24 of the movable side 5. Thus, the fixed mold plate 6 is fixed to the movable mold plate 24. In addition to the fixed side pressing pin 72, a fixed side pressing return pin 73 is provided on the fixed side pressing plate 71 of the fixed side pressing mechanism 7 provided in the first fixed side portion 4a. The fixed-side pressing return pin 73 passes through the fixed-side mold plate 6 a and faces the movable-side mold plate 24 of the movable side portion 5. The fixed-side pressing plate 71 is movably provided in the fixed-side mold plate. The fixed-side pressing plate 71 is a fixed-side pressing mechanism driving unit 202a such as a pneumatic cylinder or a hydraulic cylinder that moves the fixed-side pressing plate. (See FIG. 15). The fixed push return pin 73 has the following three functions. That is, the first function is to return the pressing plate 71 to the runner plate 8 side by contacting the movable mold plate 24 when the mold is closed when the pressing plate 71a is not returned to the runner plate 8 side. It is. The second function is to guide the pressing plate 71 so that it does not move while tilting. The third function is to separate the first fixed mold 10 from the movable mold 12 as will be described later.

  The configuration of the eject plate 701 of the eject mechanism 700 provided on the second fixed side portion 4b is the same as that of the fixed side pressing mechanism 7 of the first fixed side portion 4b. That is, the ejector plate 701 is provided with a return pin 703 in addition to the ejector pin 702. The return pin 703 is opposed to the movable mold plate 24 of the movable side portion 5. The ejector plate 701 is movably provided in the fixed mold plate. The ejector plate 701 is connected to an ejector mechanism drive unit 202b (see FIG. 15) such as a pneumatic or hydraulic cylinder that moves the ejector plate 701. The return pin 703 of the ejector mechanism 700 has the following two functions. That is, when the eject plate 701 is caught and not returned to the runner plate 8 side, the movable plate plate 24 comes into contact with the movable mold plate 24 when the mold is closed, and the eject plate 701 is returned to the runner plate 8 side. The second function is to guide the eject plate 701 so that the eject plate 701 is not tilted and moved.

  Each movable side part 5a, 5b has a spacer block 110 having a space for moving a movable side pressing plate 251 of the movable side pressing mechanism 25 and an angular plate 26 of the slider mechanism 210 described later. The spacer block 110 holds a movable mold plate 24 that holds the movable mold 12. The movable side pressing mechanism 25 has the same configuration as the fixed side pressing mechanism 7 provided on the fixed side portion. That is, the movable side pressing plate 251 is provided with the movable side pressing pin 252 and the movable side return pin 253. The movable-side pressing pin 252 of the movable-side pressing mechanism 25 penetrates the movable-side mold plate 24 and the movable-side mold 12, and the tip faces the casing molding portion of the movable-side mold 12. The movable-side return pin 253 of the movable-side pressing mechanism 25 penetrates the movable-side mold plate 24, and the tip faces the parting line (surface facing the fixed side portion) of the movable-side mold plate 24. . This movable side return pin 253 also has a function of returning the movable side pressing plate 251 to its original position when the mold is closed, a function of guiding the movable side pressing plate, and a second fixed side mold 20 as described later. It has the function to make it separate from.

  Each of the movable side portions 5a and 5b is provided with a plate-like slider 21 which is a holding means and is a counter member, and a slide mechanism 210 for sliding the slider. The slider 21 is slidably attached to a rectangular concave portion provided on a parting line (a surface facing the first fixed side portion) of the movable mold plate 24. The slide mechanism 210 includes an angular pin 22, an angular plate 26, and a slider drive unit 205 (see FIG. 15) that moves the angular plate 26. As shown in FIG. 12, the slider 21 is provided with a rectangular through hole 21a, and the tip of the angular pin 22 passes through the through hole 21a. The angular pin 22 is attached to an angular plate 26 movably provided inside the spacer block 110, and penetrates the movable mold plate 24. The outer surface of the through hole 21a of the slider 21 is a tapered surface that approaches the inner side (movable mold) from the lower side to the upper side in the figure. The portion facing the tapered surface of the through hole 21a at the tip of the slide pin 22 is also a tapered surface that approaches the inside (movable mold) from the lower side to the upper side in the figure.

  Each fixed side portion 4a, 4b is provided with a locking block 23 for locking the slide of the slider 21. As shown in FIG. 12, the locking block 23 of the first fixed side portion 4 a is attached to the mold plate 6, and the tip is in contact with the outer end portion of the slider 21 when the die is closed. On the other hand, as shown in FIG. 13, the locking block 23 of the second fixed side portion 4b is attached to the runner plate 8, penetrates the mold plate 6, and the tip is the outer end of the slider 21 when the die is closed. Abut. The outer end of the slider 21 has a tapered surface that approaches the inner side (movable mold side) from the lower side to the upper side in the drawing. Further, the outer end of the slider at the tip of the locking block 23 and the contact portion are also tapered so as to approach the inner side (movable mold side) from the lower side to the upper side in the figure.

FIG. 14 is an enlarged cross-sectional view of a main part around the second fixed mold 20.
As shown in FIG. 14, the overflow molding part 20a is provided in the location where the 2nd material inject | emitted from the nozzle of the 2nd stationary-side metal mold | die 20 crosses. The overflow molding portion 20a is provided with a gas vent valve (not shown).

FIG. 15 is a block diagram showing a part of an electric circuit in a two-color molding machine of a modified example.
A movable side pressing mechanism driving unit 206 and a slider driving unit 205 are also connected to the control unit 200 of the two-color molding machine of this modification.

Next, the process of the primary molding part of the two-color molding machine of this modification will be described with reference to FIGS. 12 and 16 (a).
First, after performing the mold closing operation (S11), the controller 200 injects a first material from a nozzle (not shown) of the first injection machine 203a as shown in FIG. The product case 100 is formed (S12). At this time, the slider 21 is located at a position where a part of the slider 21 faces the housing 100. Next, the control unit 200 controls the first plate driving unit 201a to move the sprue rate 9 in the direction away from the runner plate 8 as shown in FIG. , Exposing (S13). Next, as shown in FIG.12 (c), the 2nd plate 92 of the sprue rate 9 is spaced apart from the 1st plate 91, and it is easy to remove the sprue runner part S1.

  Next, the control unit 200 releases the lock of the plastic lock 19 (S14) and controls the fixed-side pressing mechanism driving unit 202a to move the pressing plate 71 to the first fixed-side metal as shown in FIG. Move to the mold 10 side (S15). Then, the fixed-side return pin 73 protrudes from the mold plate 6 and moves the mold plate 6 and the runner plate 8 in a direction to separate from the movable mold 12. At the same time, the fixed-side pressing pin 72 protrudes and presses the casing 100 that is the primary molded product against the movable-side mold 12. At this time, a part of the slider 21 faces a part of the casing 100, and the casing 100 is held by the first fixed mold 10 and moves together with the first fixed mold 10. Stop. As described above, in the two-color molding machine of the modified example, the housing 100 is held on the movable-side mold 12 by the slider 21 and the fixed-side pressing pin 72. In this modification, the first fixed mold 10 and the movable mold 12 are separated by a fixed return pin 73 provided on the fixed pressing plate 71. Therefore, the separation timing of the first fixed mold 10 and the protrusion timing of the fixed pressing pin 72 can be synchronized with a simple configuration. Thereby, the housing 100 can be reliably pressed against the movable mold 12 side by the fixed-side pressing pin 72.

  Then, when the predetermined amount of mold is opened by the fixed return pin 73, the control unit 200 controls the first plate driving unit 201a, and the mold plate 6 and the run plate 8 as shown in FIG. Are moved away from the movable mold 12 (S16). As a result, the first fixed mold 10 is completely separated from the movable mold 12.

Next, the process of the secondary molding part 3 of the two-color molding machine of this modification is demonstrated using FIG. 13 and FIG.16 (b).
First, after performing the mold closing operation (S21), the control unit 200 is substantially synchronized with the injection of the first material melted in the primary molding unit 2 as shown in FIG. A molten second material (thermoplastic elastomer) is injected from a nozzle (not shown) of the two-injection machine 203b (S22). Then, the second material is filled in the space formed by the casing 100 held by the movable mold 12 and the seal member molding portion of the second fixed mold 20, and the predetermined position of the casing 100 is set. The seal member 101 is molded. At this time, the second material injected from the four gates into the space formed by the casing 100 and the sealing member molding portion of the second fixed side mold passes through a path as shown in FIG. Are filled into the overflow molding portion 20a shown in FIG. At this time, the gas generated from the second material injected into the space flows to the overflow molding part 20a and is discharged from a gas vent valve (not shown) provided in the overflow molding part 20a. By providing the overflow molding part 20a, the following effects can be obtained. That is, even if the gas does not completely escape and accumulates in the space and a filling failure occurs, the location where the filling failure occurs is the overflow portion 101b that is filled with the second material and molded last. (See FIG. 10). As a result, it is possible to suppress the occurrence of a lack of thickness due to poor filling in the seal portion 101c of the seal member 101. Further, by providing a gas vent valve (not shown) in the overflow molding portion 20a, a trace of the gas vent valve is generated in the overflow portion 101c, and the sealing performance is not affected.

  When the seal member 101 is formed on the housing 100, the control unit 200 controls the second plate driving unit 201b to move the sploop rate 9 and the runner plate 8 to the movable side metal plate as shown in FIG. Move away from the mold 12 (S23). Thereby, the locking block 23 is separated from the outer end portion of the slider 21. Next, the control unit 200 controls the slider driving unit 205 to move the angular plate 26 to the movable mold side and move the angular pin 22 as shown in FIG. Then, the tapered surface at the tip of the angular pin comes into contact with the tapered surface of the through hole 21a of the slider 21, and the slider 21 is moved to the left in the drawing (S24). As a result, the portion of the slider 21 facing the part of the housing 100 is retracted.

  Next, the control unit 200 releases the lock of the plastic lock 19 (S25), and controls the movable side pressing mechanism driving unit 206 to move the movable side pressing plate 251 to the movable side metal as shown in FIG. Move to the mold side. Then, the movable return pin 253 protrudes from the movable mold plate 24 and moves the fixed mold plate 6. At the same time, the movable side pressing pin 252 protrudes and presses the finished product against the second fixed side mold 20. At this time, as described above, since the slider 21 is retracted and is not opposed to the housing 100, the finished product is not prevented from moving by the slider 21, and the second fixed side mold 20 is not moved. It is held and moves together with the second fixed side mold 20. In this modification, when the second fixed mold 20 and the movable mold 12 are separated from each other, the finished product is pressed against the second fixed mold 20 with the movable pressing pin 252. As a result, the finished product can be reliably held in the second fixed mold 20.

  Next, the control unit 200 controls the second plate driving unit 201b to move the sprue rate 9 away from the runner plate 8 as shown in FIG. 13 (e) (S26). Then, the sprue rate 9 and the runner plate 8 are separated from each other, and the sprue runner portion S2 is exposed. Next, as shown in FIG. 13 (f), the second plate 92 of the sprue rate 9 is separated from the first plate 91 to facilitate removal of the sprue runner portion S2. Next, the control unit 200 controls the second plate driving unit 201b to move the mold plate 6 and the runner plate 8 away from the movable mold 12 as shown in FIG. Thus, the second fixed mold 20 is completely separated from the movable mold 12 (S28). Next, a jig (not shown) for holding the finished product is inserted between the second fixed side portion 4b and the second movable side portion 5b. And the control part 200 controls the eject mechanism drive part 202b, and moves the ejector plate 71 to the 2nd stationary-side metal mold | die 20 side, as shown in FIG.13 (h). Then, the finished product is removed from the second fixed mold 20 by the ejector pins 72 and held by the jig.

  In this modified example, when the first fixed mold 10 as the first mold and the movable mold 12 as the moving mold are separated from each other in the primary molding unit 2, the casing 100 is moved to the movable mold. 12 is provided with a holding means. Specifically, the holding means has the following two configurations. That is, the first holding means is provided on the first fixed side portion 4 which is the first mold side, and when the first fixed side mold 10 is separated from the movable mold 12, the casing 100 is moved to the movable side. This is a fixed side pressing mechanism 7 as pressing means for pressing to the mold side. The second holding means is slidably provided on the surface of the movable side part 5 on the movable mold side facing the first fixed side part 4, and at least the first fixed side mold 10 is moved from the movable side mold 12. The slider 21 is a facing member that faces a part of the housing 100 when being separated. When the first fixed mold 10 is separated from the movable mold 12, the housing 100 is pressed against the movable mold 12 by the pressing pin 71 of the fixed pressing mechanism 7. At this time, a part of the slider 21 is opposed to the housing 100 to prevent the housing 100 from moving together with the first fixed mold 10. Thereby, the housing | casing 100 can be reliably hold | maintained at the movable mold 12. FIG.

  In this modified example, the second fixed side mold 20 as the second mold is formed so that the overflow part 101b for finally flowing the second material into the part other than the seal part 101c of the seal member 101 is formed. Is provided with an overflow molding portion 20a. Thereby, even if the filling failure of the second material occurs, the influence is generated in the overflow portion 101b into which the second material finally flows. As a result, it is possible to suppress the occurrence of a lack of thickness or the like in the seal portion 101c of the seal member 101, and it is possible to mold the housing 100 including the seal member 101 that can obtain good sealing performance.

  Also in this modified example, since the inner peripheral surface of the housing 100 is formed by the first fixed mold 12, the gate can be easily set on the inner peripheral surface of the housing 100. Thereby, since a gate trace does not arise in the outer peripheral surface of the housing | casing 100, it can suppress impairing the external appearance of a product.

  Moreover, in the said modification, although the slider 21 is provided only in the left side in a figure, as shown in FIG. 17, you may provide multiple sliders 21. As shown in FIG. In the configuration shown in FIG. 17, rectangular recesses 24R and 24L are provided on the left and right sides of the surface of the movable mold plate 24 facing the fixed mold plate, and a slider 21R is provided in these recesses 24R and 24L. 21L are slidably provided. When the casing 100 is molded by the first molding unit 2 and the first fixed mold 10 and the movable mold 12 are separated from each other, as shown in FIG. The body 100 is opposed to the left end in the drawing. Further, a part of the slider 21R on the right side in the drawing is opposed to the right end portion of the housing 100 in the drawing. Thereby, the sliders 21 </ b> L and 21 </ b> R prevent the casing 100 from moving together with the first fixed mold 10, and the casing 100 can be held by the movable mold 12. Then, when the finished product is molded by the secondary molding unit 3 and the second fixed side mold 20 is separated from the movable side mold 12, as shown in FIG. The slider 21L on the left side in the figure is moved in the direction of arrow A1 in the figure. Further, the right angular pin 22R in the drawing is moved to the fixed side, and the right slider 21R in the drawing is moved in the direction of arrow A2 in the drawing. Accordingly, the sliders 21L and 21R are retracted and do not face the housing 100. When the sliders 21R and 21L are retracted, the second fixed side mold 20 is moved away from the movable side mold 12. At this time, since each slider 21R, 21L is in the retracted position and does not face the housing 100, the finished product is held by the second fixed mold 20 and moved together with the second fixed mold 20. To do.

1: two-color molding machine 2: primary molding part 3: secondary molding part 4a: first fixed side part 4b: second fixed side part 5a: first movable side part 5b: second movable side parts 6a, 6b: gold Mold plate 7a: Pressing mechanism 7b: Ejector mechanisms 8a, 8b: Runner plates 9a, 9b: Spoop rate 10: First fixed mold 11a, 11b: Mold holding part 12a: First movable mold 12b: Second Movable mold 14: sprue portion 15a15b: sprue 16a, 16b: springs 17a, 17b, 18a, 18b: runner 20: second fixed mold 71a, 71b: ejector plates 72a, 72b: ejector pins 73a, 73b: cylinders 100: Housing 101: Sealing members S1, S2: Sprue runner part

JP-A-6-297497

Claims (5)

A process of injecting the molten first material into a space formed by overlapping the moving mold and the first mold to mold the casing, and a state in which the casing is held by the moving mold The step of separating the first mold from the moving mold, the step of moving the moving mold to a position facing the second mold for molding the seal member, and the moving mold The molten second material that is softer than the first material is injected into the space formed by overlapping the second mold, and a sealing member is formed on the casing held by the moving mold. And a process of
A plurality of gate parts for injecting a second material into a space formed by overlapping the moving mold and the second mold, and a second material flowing from the gate part with the second mold; , Where the gate portion and the second material flowing from the adjacent gate portion intersect, and at a location other than the seal portion of the seal member, an overflow portion is formed ,
It is slidably provided on a surface facing the first mold on the movable mold side, and at least at a position facing the part of the housing when the first mold is separated from the movable mold. A counter member that is positioned and holds the housing on the movable mold when the first mold is separated from the movable mold;
After forming a seal member on the housing held by the movable mold, the movable member provided on the movable mold side is slid from the opposed position to the retracted position not opposed to the housing. A casing having a sealing member, wherein the second mold is separated from the movable mold in a state where the casing in which a sealing member is molded with a side pressing pin is pressed against the second mold. Manufacturing method . In the manufacturing method of the housing | casing provided with the sealing member of Claim 1,
A method for manufacturing a housing having a seal member, wherein an amorphous material is used as the first material, and a thermoplastic elastomer is used as the second material. In the manufacturing method of the housing | casing provided with the sealing member of Claim 1 or 2 ,
Upper SL provided on first mold side, a seal member characterized by comprising a pressing means for pressing the said movable mold side the housing when separating the said first mold from said movable die A method for manufacturing a housing provided. In the method for manufacturing a housing having a 請 Motomeko 1 to 3 or of the sealing member,
On SL second mold side, a manufacturing method of a housing with a seal member, characterized in that a retrieving means for retrieving the housing seal member molded from the second mold. In the manufacturing method of the housing | casing provided with the sealing member in any one of Claims 1 thru | or 4 ,
A method for manufacturing a casing provided with a sealing member, wherein an inner peripheral surface of the casing is molded by a first mold.

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