JP7379252B2 - mold equipment - Google Patents

Description

The present invention relates to a mold apparatus.

Patent Document 1 discloses a mold device used for molding a hollow molded product. The mold device has a fixed mold, a sliding mold, and a movable mold. The fixed mold is fixed to a fixed platen of an injection molding machine. The sliding mold is slid up and down while in close contact with the fixed mold. The movable mold is attached to a movable platen of an injection molding machine. A male mold and a female mold are provided on the mating surface of the slide mold with the movable mold. Moreover, a male mold and a female mold are also provided on the mating surface of the movable mold with the slide mold.

In the primary molding, a cavity is formed between a male sliding mold and a female movable mold, and a cavity is also formed between a female sliding mold and a male movable mold. Each of the two cavities is filled with molten resin, and a divided body of the hollow molded product is molded in each of the two cavities.

Next, the mold is opened. At that time, each of the two split bodies separates from the male mold and remains in the female mold. Next, the slide mold is slid so that the two divided bodies face each other. The mold is then closed and the two halves are butted against each other. A cavity is formed around the abutting surfaces of the two divided bodies.

In secondary molding, a cavity is formed around the abutting surfaces of two divided bodies, and the cavity is filled with molten resin. As a result, the two divided bodies are welded together to form one hollow molded product. Thereafter, the mold is opened and the hollow molded product is taken out from the mold device.

Special Publication No. 2-38377

Some injection molding machines have a rotating disk. A mold is attached to the rotary disk, and the mold is rotated together with the rotary disk.

Patent Document 1 does not consider forming a hollow molded product using a mold that is rotated together with a rotary disk.

One aspect of the present invention provides a technique for molding a hollow molded product using a mold that is rotated together with a rotary disk.

A mold device according to one aspect of the present invention includes:
A mold device used for molding a hollow molded product including a first divided product, a second divided product, and a bonding layer that joins the first divided product and the second divided product,
including a first convex type, a second convex type, a first concave type, and a second concave type,
The first convex mold and the second concave mold are attached to a platen of an injection molding machine,
The second convex mold and the first concave mold are attached to a rotary disk disposed opposite to the platen of the injection molding machine,
The first convex mold and the first concave mold form a first cavity space in which the first divided product is molded,
The second convex mold and the second concave mold form a second cavity space in which the second divided product is molded,
The first concave mold and the second concave mold form a third cavity space in which the bonding layer is molded with the first divided product and the second divided product accommodated therein,
the first convex mold is movably attached to the second concave mold, and/or the second convex mold is movably attached to the first concave mold ,
At least one of a first convex moving mechanism that moves the first convex mold relative to the second concave mold, and a second convex moving mechanism that moves the second convex mold relative to the first concave mold. Including .

According to one aspect of the present invention, a hollow molded product can be molded using a mold that is rotated together with a rotary disk.

FIG. 1 is a flowchart showing a method for manufacturing a hollow molded product using a mold apparatus according to an embodiment. FIG. 2(A) is a sectional view showing a state of the mold apparatus according to an embodiment immediately before S101, and FIG. 2(B) is a sectional view showing a state of the mold apparatus according to an embodiment at S101. FIG. 3(A) is a sectional view showing the state of S102 of the mold apparatus according to one embodiment, and FIG. 3(B) is a sectional view showing the state of S103 of the mold apparatus according to one embodiment. FIG. 4(A) is a cross-sectional view showing the state of S104 of the mold apparatus according to one embodiment, and FIG. 4(B) is a cross-sectional view showing the state of S105 of the mold apparatus according to one embodiment. FIG. 5(A) is a sectional view showing the state of S106 of the mold apparatus according to one embodiment, and FIG. 5(B) is a sectional view showing the state of S107 of the mold apparatus according to one embodiment. FIG. 6(A) is a cross-sectional view showing the state of S108 of the mold apparatus according to one embodiment, and FIG. 6(B) is a cross-sectional view showing the state of S109 of the mold apparatus according to one embodiment. FIG. 7(A) is a cross-sectional view showing the state of the mold apparatus according to the modified example immediately before S101, and FIG. 7(B) is a cross-sectional view showing the state of the mold apparatus according to the modified example at S101. FIG. 8(A) is a sectional view showing the state of S102 of the mold apparatus according to the modification, and FIG. 8(B) is a sectional view showing the state of S103 of the mold apparatus according to the modification. FIG. 9(A) is a cross-sectional view showing the state of S104 of the mold apparatus according to the modified example, and FIG. 9(B) is a cross-sectional view showing the state of S105 of the mold apparatus according to the modified example. FIG. 10(A) is a sectional view showing the state of S106 of the mold apparatus according to the modification, and FIG. 10(B) is a sectional view showing the state of S107 of the mold apparatus according to the modification. FIG. 11(A) is a sectional view showing the state of S108 of the mold apparatus according to the modification, and FIG. 11(B) is a sectional view showing the state of S109 of the mold apparatus according to the modification.

Embodiments of the present invention will be described below with reference to the drawings. Note that in each drawing, the same or corresponding configurations are denoted by the same reference numerals, and the description thereof may be omitted.

FIG. 1 is a flowchart showing a method for manufacturing a hollow molded product using a mold apparatus according to an embodiment. FIG. 2(A) is a cross-sectional view showing a state of the mold apparatus according to one embodiment immediately before S101. FIG. 2(B) is a cross-sectional view showing the state of S101 of the mold device according to one embodiment. FIG. 3(A) is a cross-sectional view showing the state of S102 of the mold device according to one embodiment. FIG. 3(B) is a cross-sectional view showing the state of S103 of the mold device according to one embodiment. FIG. 4(A) is a cross-sectional view showing the state of S104 of the mold device according to one embodiment. FIG. 4(B) is a cross-sectional view showing the state of S105 of the mold apparatus according to one embodiment. FIG. 5(A) is a cross-sectional view showing the state of S106 of the mold device according to one embodiment. FIG. 5(B) is a cross-sectional view showing the state of S107 of the mold device according to one embodiment. FIG. 6(A) is a cross-sectional view showing the state of S108 of the mold device according to one embodiment. FIG. 6(B) is a cross-sectional view showing the state of S109 of the mold device according to one embodiment.

In this specification, the X-axis direction, the Y-axis direction, and the Z-axis direction are directions perpendicular to each other. The X-axis direction and the Y-axis direction represent the horizontal direction, and the Z-axis direction represents the vertical direction. When the mold clamping device 31 of the injection molding machine 3 is a horizontal type, the X-axis direction is the mold opening/closing direction.

As shown in FIG. 6(B), the mold device 1 is used to mold a hollow molded product 2. As shown in FIG. The hollow molded product 2 includes a first divided product 21 , a second divided product 22 , and a bonding layer 23 that joins the first divided product 21 and the second divided product 22 . The first divided product 21 includes a recess 21b on the abutting surface 21a with the second divided product 22. The second divided product 22 also includes a recess 22b on the abutting surface 22a with the first divided product 21. A hollow structure is formed by the recess 21b of the first divided product 21 and the recess 22b of the second divided product 22. The bonding layer 23 is formed in a ring shape on the outer edges of the abutting surfaces 21a and 22a of the first divided product 21 and the second divided product 22. The bonding layer 23 welds the first divided product 21 and the second divided product 22 together.

The mold device 1 includes a first convex mold 11, a second convex mold 12, a first concave mold 13, and a second concave mold 14. As shown in FIG. 2(B), the first convex mold 11 and the first concave mold 13 form a first cavity space 15 in which the first divided product 21 is molded. Further, the second convex mold 12 and the second concave mold 14 form a second cavity space 16 in which the second divided product 22 is molded. The first cavity space 15 and the second cavity space 16 are arranged at intervals in the Y-axis direction, for example. Further, as shown in FIG. 5(A), the first recessed mold 13 and the second recessed mold 14 are molded with the bonding layer 23 with the first divided product 21 and the second divided product 22 accommodated therein. A third cavity space 17 is formed.

As shown in FIG. 2(A), the first convex mold 11 and the second concave mold 14 are attached to a fixed platen 32. As shown in FIG. The fixed platen 32 is fixed to a frame (not shown). On the other hand, the second convex mold 12 and the first concave mold 13 are attached to a rotary disk 33. The rotary disk 33 is arranged opposite to the fixed platen 32. A rotating shaft 33a of the rotary disk 33 is arranged parallel to the mold opening/closing direction, and is held by the movable platen 34 via a bearing Br. The movable platen 34 is provided to be movable forward and backward relative to the frame in the mold opening/closing direction, and is moved forward and backward relative to the fixed platen 32. The mold device 1 is opened and closed by moving the movable platen 34 forward and backward.

The injection molding machine 3 includes a mold clamping device 31 that opens and closes the mold device 1, a first injection device 35 that injects the molding material into the mold device 1, and a second injection device that injects the molding material into the mold device 1. 39.

The mold clamping device 31 performs mold closing, pressurization, mold clamping, depressurization, and mold opening of the mold device 1. The mold clamping device 31 is, for example, horizontal, and the mold opening/closing direction is horizontal. In the description of the mold clamping device 31, the direction of movement of the movable platen 34 (for example, the positive direction of the X-axis) when the mold is closed is assumed to be the front, and the direction of movement of the movable platen 34 when the mold is opened is assumed to be the rear.

The mold clamping device 31 includes a fixed platen 32 to which the first convex die 11 and the second concave die 14 are attached, a rotating disk 33 to which the second convex die 12 and the first concave die 13 are attached, and the rotating disk 33 is rotatable. It has a movable platen 34 attached to the rotary platen 34, a rotation mechanism that rotates the rotary disk 33, and a movement mechanism that moves the movable platen 34 forward and backward with respect to the fixed platen 32.

Fixed platen 32 is fixed relative to the frame. A first convex mold 11 and a second concave mold 14 are attached to a surface of the fixed platen 32 facing the rotary disk 33. As shown in FIG. 2(B), the first convex mold 11 forms a part of the wall surface of the first cavity space 15. As shown in FIG. On the other hand, the second concave mold 14 forms a part of the wall surface of the second cavity space 16.

The rotary disk 33 is rotatably attached to the movable platen 34. The rotation center line R of the rotary disk 33 is parallel to the mold opening/closing direction. A second convex mold 12 and a first concave mold 13 are attached to a surface of the rotary disk 33 facing the fixed platen 32 . As shown in FIG. 2(B), the second convex mold 12 forms a part of the wall surface of the second cavity space 16. On the other hand, the first concave mold 13 forms a part of the wall surface of the first cavity space 15 .

The rotary disk 33 is rotated between a first rotation angle and a second rotation angle by a rotation mechanism. For example, as shown in FIG. 2(B), the first rotation angle is such that the first convex mold 11 and the first concave mold 13 form a first cavity space 15, and the second convex mold 12 and the second concave mold 14 form a first cavity space 15. is the rotation angle that forms the second cavity space 16. The first rotation angle is, for example, 0°. On the other hand, the second rotation angle is a rotation angle at which the first concave mold 13 and the second concave mold 14 form a third cavity space 17, as shown in FIG. 5(A). The second rotation angle is, for example, 180°.

Each time the rotary disk 33 is rotated 180 degrees, the rotation direction of the rotary disk 33 may be reversed. For example, the rotary disk 33 rotates 180 degrees clockwise, and then rotates 180 degrees counterclockwise. Since the arrangement of the wiring and piping fixed to the rotary disk 33 is returned to its original position, the wiring and piping can be easily routed.

The movable platen 34 is arranged to be movable forward and backward relative to the frame in the mold opening/closing direction. When the movable platen 34 is advanced, the rotary disk 33 is advanced, and the second convex mold 12 and the first concave mold 13 are advanced. As a result, mold closing, pressure increase, and mold clamping are performed. On the other hand, when the movable platen 34 is moved backward, the rotary disk 33 is moved backward, and the second convex mold 12 and the first concave mold 13 are moved backward. As a result, depressurization and mold opening are performed.

Although the mold clamping device 31 of this embodiment is a horizontal type in which the mold opening/closing direction is the horizontal direction, it may be a vertical type in which the mold opening/closing direction is the vertical direction.

As shown in FIG. 2(B), the first injection device 35 touches the first convex mold 11 of the mold device 1 and fills the first cavity space 15 in the mold device 1 with the molding material. On the other hand, the second injection device 39 touches the second concave mold 14 of the mold device 1 and fills the second cavity space 16 in the mold device 1 with the molding material.

The first injection device 35 and the second injection device 39 are arranged at intervals in the Y-axis direction. This is because the first cavity space 15 and the second cavity space 16 are arranged at intervals in the Y-axis direction. The molding material that the first injection device 35 fills into the first cavity space 15 and the molding material that the second injection device 39 fills into the second cavity space 16 may be different materials or may be the same material.

The first injection device 35 and the second injection device 39 are configured similarly. Therefore, the configuration of the first injection device 35 will be described below, and the description of the configuration of the second injection device 39 will be omitted. In the description of the first injection device 35, unlike the description of the mold clamping device 31, the moving direction of the screw 38 during filling (for example, the negative direction of the The forward direction) will be explained as backward.

The first injection device 35 includes, for example, a cylinder 36 that heats the molding material, a nozzle 37 provided at the front end of the cylinder 36, and a screw 38 arranged rotatably and movably back and forth within the cylinder 36. .

The cylinder 36 heats the molding material supplied therein. The molding material includes, for example, resin. The molding material is formed into a pellet shape, for example, and is supplied in a solid state. The cylinder 36 is divided into a plurality of zones in the axial direction (for example, the X-axis direction) of the cylinder 36. A heater and a temperature detector are provided in each of the plurality of zones. A set temperature is set for each of the plurality of zones, and the heater is controlled so that the temperature detected by the temperature detector becomes the set temperature.

The nozzle 37 is provided at the front end of the cylinder 36 and is pressed against the mold device 1 . A heater and a temperature detector are provided on the outer periphery of the nozzle 37. The heater is controlled so that the detected temperature of the nozzle 37 becomes the set temperature.

The screw 38 is arranged within the cylinder 36 so as to be rotatable and movable back and forth. When the screw 38 is rotated, the molding material is sent forward along the spiral groove of the screw 38. The molding material is gradually melted by the heat from the cylinder 36 while being sent forward. As the liquid molding material is fed in front of the screw 38 and accumulated in the front of the cylinder 36, the screw 38 is retracted. Thereafter, when the screw 38 is moved forward, the liquid molding material accumulated in front of the screw 38 is injected from the nozzle 37 and filled into the mold device 1 .

Although the first injection device 35 of this embodiment is of an in-line screw type, it may also be of a pre-plastic type. A pre-plastic injection device supplies a molding material melted in a plasticizing cylinder to an injection cylinder, and injects the molding material from the injection cylinder into a mold device. Inside the plasticizing cylinder, a screw is arranged so as to be rotatable but cannot move forward or backward, or a screw is arranged so as to be rotatable and moveable back and forth. On the other hand, a plunger is arranged within the injection cylinder so that it can move forward and backward.

Further, the first injection device 35 of this embodiment is a horizontal type in which the axial direction of the cylinder 36 is horizontal, but may be a vertical type in which the axial direction of the cylinder 36 is in the vertical direction. The mold clamping device combined with the vertical first injection device 35 may be vertical or horizontal. Similarly, the mold clamping device combined with the horizontal first injection device 35 may be horizontal or vertical.

Next, a method for manufacturing the blow molded product 2 will be described with reference to FIGS. 1 to 6. The method for manufacturing the blow molded product 2 includes steps S101 to S109 shown in FIG. Immediately before step S101, as shown in FIG. 2(A), the mold opening of the mold device 1 has been completed, and the first convex mold 11 and the first concave mold 13 are arranged facing each other, and the second convex mold 12 and the second concave mold 14 are arranged to face each other. The rotation angle of the rotary disk 33 is a first rotation angle.

In step S101, as shown in FIG. 2(B), the movable platen 34 is advanced, the second convex mold 12 and the first concave mold 13 are advanced, and mold closing, pressurization, and mold clamping are performed. During mold clamping, the first convex mold 11 and the first concave mold 13 form a first cavity space 15, and the second convex mold 12 and the second concave mold 14 form a second cavity space 16.

The first convex mold 11 has a contact surface 11 a that abuts on the first concave mold 13 . The contact surface 11a is a flat surface perpendicular to the mold opening/closing direction. The first convex mold 11 has a convex portion 11b on its contact surface 11a. The dimensions and shape of the convex portion 11b determine the dimensions and shape of the concave portion 21b of the first divided product 21. Further, the first convex mold 11 has a ring portion 11c on its contact surface 11a. The dimensions and shape of a portion of the bonding layer 23 are determined by the dimensions and shape of the ring portion 11c.

On the other hand, the first concave mold 13 has a contact surface 13a that comes into contact with the first convex mold 11. The contact surface 13a is a flat surface perpendicular to the mold opening/closing direction. The first concave mold 13 has a concave portion 13b on its contact surface 13a. The concave portion 13b accommodates the convex portion 11b of the first convex mold 11 and the ring portion 11c.

Further, the second convex mold 12 has a contact surface 12 a that comes into contact with the second concave mold 14 . The contact surface 12a is a flat surface perpendicular to the mold opening/closing direction. The second convex mold 12 has a convex portion 12b on its contact surface 12a. The dimensions and shape of the convex portion 12b determine the dimensions and shape of the concave portion 22b of the second divided product 22. Further, the second convex mold 12 has a ring portion 12c on its contact surface 12a. The dimensions and shape of the ring portion 12c determine the dimensions and shape of the remaining portion of the bonding layer 23.

On the other hand, the second concave mold 14 has a contact surface 14a that abuts on the second convex mold 12. The contact surface 14a is a flat surface perpendicular to the mold opening/closing direction. The second concave mold 14 has a concave portion 14b on its contact surface 14a. The concave portion 14b accommodates the convex portion 12b of the second convex mold 12 and the ring portion 12c.

In step S102, as shown in FIG. 3A, the first injection device 35 fills the first cavity space 15 with the liquid molding material, and the second injection device 39 fills the second cavity space 16 with the liquid molding material. Fill it. In the first cavity space 15, the molding material is cooled and solidified, and the first divided product 21 is molded. Further, in the second cavity space 16, the molding material is cooled and solidified, and the second divided product 22 is molded. The molding of the first divided product 21 and the molding of the second divided product 22 are also referred to as primary molding.

In step S103, as shown in FIG. 3(B), the movable platen 34 is retreated, the second convex mold 12 and the first concave mold 13 are retreated, and depressurization and mold opening are performed. The first divided product 21 is moved back together with the first concave mold 13 while being attached to the first concave mold 13, and is released from the first convex mold 11. On the other hand, the second divided product 22 is fixed in a state where it is attached to the second concave mold 14 and is released from the second convex mold 12.

The mold device 1 may have a suction hole in the wall surface forming the first cavity space 15 of the first concave mold 13 for sucking the first divided product 21 . When the air pressure in the suction hole becomes negative pressure by a vacuum pump or the like, the first divided product 21 is attracted to the first concave mold 13 . The first divided product 21 can be left in the first concave mold 13 reliably.

Further, the mold device 1 may have an injection hole in a wall surface forming the first cavity space 15 of the first convex mold 11 for injecting gas such as air. When the injection hole injects gas, the first divided product 21 is released from the first convex mold 11. The first divided product 21 can be reliably released from the first convex mold 11.

The mold device 1 may have a suction hole in the wall surface forming the second cavity space 16 of the second concave mold 14 for sucking the second divided product 22 . When the air pressure in the suction hole becomes negative pressure by a vacuum pump or the like, the second divided product 22 is attracted to the second concave mold 14 . The second divided product 22 can be reliably left in the second concave mold 14.

Moreover, the mold apparatus 1 may have an injection hole in the wall surface forming the second cavity space 16 of the second convex mold 12 for injecting gas such as air. When the injection hole injects gas, the second divided product 22 is released from the second convex mold 12. The second divided product 22 can be reliably released from the second convex mold 12.

In step S104, as shown in FIG. 4(A), the rotary disk 33 is rotated from the first rotation angle to the second rotation angle. As a result, the first convex mold 11 and the second convex mold 12 are arranged to face each other, and the first concave mold 13 and the second concave mold 14 are arranged to face each other.

In this state, if the movable platen 34 is moved forward, the convex portion 12b of the second convex mold 12 will move forward before the contact surface 13a of the first concave mold 13 comes into contact with the contact surface 14a of the second concave mold 14. It comes into contact with the convex portion 11b of the first convex mold 11. As a result, mold closing, pressurization, and mold clamping of the first recessed mold 13 and the second recessed mold 14 are hindered, and the formation of the third cavity space 17 is hindered.

Therefore, in step S105, as shown in FIG. 4(B), the second convex mold moving mechanism 18 of the mold apparatus 1 moves the second convex mold 12 relative to the first concave mold 13 in the mold opening/closing direction (for example, along the X axis). direction). The second convex mold moving mechanism 18 retracts the second convex mold 12 to a position where it does not interfere with mold closing, pressurization, and mold clamping of the first concave mold 13 and the second concave mold 14. The second convex mold 12 is moved in a direction away from the first convex mold 11.

The second convex mold moving mechanism 18 includes a guide block 18a that guides the second convex mold 12 in the mold opening/closing direction, and an actuator 18b that moves the second convex mold 12 in the mold opening/closing direction. The actuator 18b may be mechanical or hydraulic.

Note that the mold device 1 may have a first convex moving mechanism, which will be described later, instead of the second convex moving mechanism 18. The first convex mold moving mechanism moves the first convex mold 11 relative to the second concave mold 14 in the mold opening/closing direction. The first convex mold 11 is attached to the fixed platen 32 so that it can move forward and backward.

The first convex moving mechanism moves the first convex mold 11 to a position that does not interfere with mold closing, pressurization, and mold clamping of the first concave mold 13 and the second concave mold 14. The first convex mold 11 is moved in a direction away from the second convex mold 12. The first injection device 35 may be moved back and forth in accordance with the movement of the first convex mold 11 back and forth.

When the mold device 1 has the second convex moving mechanism 18 and does not have the first convex moving mechanism, the second convex die 12 is moved and the first convex die 11 is not moved. Since the nozzle 37 of the first injection device 35 does not touch the second convex mold 12, there is no need to advance or retreat the first injection device 35 in accordance with the advance or retreat of the second convex mold 12.

On the other hand, when the mold device 1 has the first convex moving mechanism but does not have the second convex moving mechanism 18, the first convex die 11 is moved and the second convex die 12 is not moved. Since it is not necessary to supply energy to move the second convex mold 12, the number of wiring or piping fixed to the rotary disk 33 can be reduced.

Further, the mold device 1 may include both the second convex moving mechanism 18 and the first convex moving mechanism. In this case, the moving distance of the first convex mold 11 is shorter than when the mold apparatus 1 has only the first convex moving mechanism, and when the mold apparatus 1 has only the second convex moving mechanism 18, In comparison, the moving distance of the second convex mold 12 is short. Therefore, by moving the first convex mold 11 and the second convex mold 12 at the same time, step S105 can be performed in a short time and throughput can be improved.

Although the second convex moving mechanism 18 is a part of the mold apparatus 1 in this embodiment, it may be provided separately from the mold apparatus 1 or may be a part of the injection molding machine 3. Similarly, the first convex moving mechanism may be part of the mold device 1 or may be part of the injection molding machine 3.

Step S105 may be performed after primary molding (S102) and before secondary molding (S107), for example, it may be performed during mold opening (S103) or during rotation (S104). Alternatively, it may be performed during mold closing (S106).

In step S106, as shown in FIG. 5(A), the movable platen 34 is advanced, the second convex mold 12 and the first concave mold 13 are advanced, and mold closing, pressurization, and mold clamping are performed. During mold clamping, the first concave mold 13 and the second concave mold 14 form a third cavity space 17 in which the bonding layer 23 is molded, with the first divided product 21 and the second divided product 22 accommodated therein. do. The third cavity space 17 is formed in a ring shape at the outer edge of the abutting surfaces 21a and 22a of the first divided product 21 and the second divided product 22. When the first concave mold 13 and the second concave mold 14 are clamped together, the first convex mold 11 and the second convex mold 12 do not need to come into contact with each other.

The second concave mold 14 has a first flow path C1 that sends the molding material injected by the second injection device 39 to the entrance of the second cavity space 16, and a first channel C1 that sends the molding material injected by the second injection device 39 to the third cavity space. 17. The second flow path C2 branches from the middle of the first flow path C1, and a direction switching portion C3 is provided at the branch point.

The direction switching unit C3 switches the flow direction of the molding material between a direction toward the entrance of the second cavity space 16 and a direction toward the entrance of the third cavity space 17. The entrance of the second cavity space 16 is provided, for example, at the bottom of the recess 14b, and the entrance of the third cavity space 17 is provided, for example, at the inner edge of the contact surface 14a. As shown in FIG. 3A, when the second injection device 39 fills the second cavity space 16 with resin, the direction switching section C3 directs the molding material toward the entrance of the second cavity space 16. On the other hand, when the second injection device 39 fills the third cavity space 17 with resin as shown in FIG. 5(B), the direction switching unit C3 directs the molding material toward the entrance of the third cavity space 17.

In step S107, as shown in FIG. 5(B), the second injection device 39 fills the third cavity space 17 with liquid molding material. In the third cavity space 17, the molding material is cooled and solidified, and the bonding layer 23 is molded. The molding of the bonding layer 23 is also called secondary molding. The bonding layer 23 is formed in a ring shape on the outer edges of the abutting surfaces 21a and 22a of the first divided product 21 and the second divided product 22. The bonding layer 23 welds the first divided product 21 and the second divided product 22 together. As a result, a hollow molded product 2 is molded.

In step S108, as shown in FIG. 6(A), the movable platen 34 is retreated, the second convex mold 12 and the first concave mold 13 are retreated, and depressurization and mold opening are performed. The hollow molded product 2 is moved back together with the first recessed mold 13 while being attached to the first recessed mold 13, and is released from the second recessed mold 14.

In step S109, as shown in FIG. 6(B), a take-out machine (not shown) takes out the hollow molded product 2 from the mold device 1. The hollow molded product 2 is taken out from the first concave mold 13. In this way, a hollow molded product 2 is obtained.

Note that in step S108, the hollow molded product 2 adheres to the first concave mold 13 in this embodiment, but it may also adhere to the second concave mold 14 and be released from the first concave mold 13. In the latter case, the hollow molded product 2 is taken out from the second concave mold 14 in step S109.

Next, a modification of the method for manufacturing the blow molded product 2 will be described with reference to FIGS. 7 to 11. FIG. 7(A) is a cross-sectional view showing the state of the mold apparatus according to the modification immediately before S101. FIG. 7(B) is a cross-sectional view showing the state of S101 of the mold device according to the modification. FIG. 8(A) is a cross-sectional view showing the state of S102 of the mold device according to the modification. FIG. 8(B) is a cross-sectional view showing the state of S103 of the mold apparatus according to the modification. FIG. 9(A) is a cross-sectional view showing the state of S104 of the mold device according to the modification. FIG. 9(B) is a cross-sectional view showing the state of S105 of the mold apparatus according to the modification. FIG. 10(A) is a cross-sectional view showing the state of S106 of the mold device according to the modification. FIG. 10(B) is a cross-sectional view showing the state of S107 of the mold device according to the modification. FIG. 11(A) is a cross-sectional view showing the state of S108 of the mold device according to the modification. FIG. 11(B) is a cross-sectional view showing the state of S109 of the mold apparatus according to the modification. Hereinafter, differences between this modification and the above embodiment will be mainly explained.

The method for manufacturing the blow molded product 2 includes steps S101 to S109 shown in FIG. Immediately before step S101, as shown in FIG. 7(A), the mold opening of the mold device 1 has been completed, and the first convex mold 11 and the first concave mold 13 are arranged facing each other, and the second convex mold 12 and the second concave mold 14 are arranged to face each other. The rotation angle of the rotary disk 33 is a first rotation angle.

In step S101, as shown in FIG. 7(B), the movable platen 34 is advanced, the second convex mold 12 and the first concave mold 13 are advanced, and mold closing, pressurization, and mold clamping are performed. During mold clamping, the first convex mold 11 and the first concave mold 13 form a first cavity space 15, and the second convex mold 12 and the second concave mold 14 form a second cavity space 16.

In step S102, as shown in FIG. 8(A), the first injection device 35 fills the first cavity space 15 with the liquid molding material, and the second injection device 39 fills the second cavity space 16 with the liquid molding material. Fill it. In the first cavity space 15, the molding material is cooled and solidified, and the first divided product 21 is molded. Further, in the second cavity space 16, the molding material is cooled and solidified, and the second divided product 22 is molded.

In step S103, as shown in FIG. 8(B), the movable platen 34 is retreated, the second convex mold 12 and the first concave mold 13 are retreated, and depressurization and mold opening are performed. The first divided product 21 is moved back together with the first concave mold 13 while being attached to the first concave mold 13, and is released from the first convex mold 11. On the other hand, the second divided product 22 is fixed in a state where it is attached to the second concave mold 14 and is released from the second convex mold 12.

In step S104, as shown in FIG. 9(A), the rotary disk 33 is rotated from the first rotation angle to the second rotation angle. As a result, the first convex mold 11 and the second convex mold 12 are arranged to face each other, and the first concave mold 13 and the second concave mold 14 are arranged to face each other.

In this state, if the movable platen 34 is moved forward, the convex portion 12b of the second convex mold 12 will move forward before the contact surface 13a of the first concave mold 13 comes into contact with the contact surface 14a of the second concave mold 14. It comes into contact with the convex portion 11b of the first convex mold 11. As a result, mold closing, pressurization, and mold clamping of the first recessed mold 13 and the second recessed mold 14 are hindered, and the formation of the third cavity space 17 is hindered.

Therefore, in step S105, as shown in FIG. 9(B), the first convex mold moving mechanism 19 of the mold apparatus 1 moves the first convex mold 11 relative to the second concave mold 14 in a direction perpendicular to the mold opening/closing direction. (for example, in the Y-axis direction). The first convex mold moving mechanism 19 moves the first convex mold 11 in the Y-axis direction to a position that does not interfere with mold closing, pressurization, and mold clamping of the first concave mold 13 and the second concave mold 14. Note that the first convex moving mechanism 19 may move the first convex mold 11 in the Z-axis direction.

The first convex mold 11 has a concave portion 11d on its contact surface 11a in addition to a convex portion 11b and a ring portion 11c. The concave portion 11d accommodates the convex portion 12b of the second convex mold 12. The first convex mold 11 is moved to a position where the convex part 12b of the second convex mold 12 and the concave part 11d of the first convex mold 11 are arranged to face each other.

The first convex moving mechanism 19 includes an actuator 19a that moves the first convex mold 11 in a direction perpendicular to the mold opening/closing direction. The actuator 19a may be mechanical or hydraulic.

Before the first convex mold 11 is moved, the first injection device 35 may be moved backward, and the nozzle 37 of the first injection device 35 may be separated from the first convex mold 11. When the first convex mold 11 is moved, friction between the first convex mold 11 and the nozzle 37 can be prevented.

Note that the mold device 1 may have a second convex moving mechanism instead of the first convex moving mechanism 19. The second convex moving mechanism moves the second convex mold 12 relative to the first concave mold 13 in a direction perpendicular to the mold opening/closing direction. The second convex moving mechanism moves the second convex mold 12 to a position that does not interfere with mold closing, pressurization, and mold clamping of the first concave mold 13 and the second concave mold 14. For example, the second convex mold 12 is moved to a position where the convex part 12b of the second convex mold 12 and the concave part 11d of the first convex mold 11 are arranged to face each other.

When the mold device 1 has the second convex moving mechanism and does not have the first convex moving mechanism 19, the second convex die 12 is moved and the first convex die 11 is not moved. Since the nozzle 37 of the first injection device 35 does not touch the second convex mold 12, there is no need to move the first injection device 35 backward before moving the second convex mold 12.

On the other hand, when the mold device 1 has the first convex moving mechanism 19 but does not have the second convex moving mechanism, the first convex die 11 is moved and the second convex die 12 is not moved. Since it is not necessary to supply energy to move the second convex mold 12, the number of wiring or piping fixed to the rotary disk 33 can be reduced.

Furthermore, the mold device 1 may include both the first convex moving mechanism 19 and the second convex moving mechanism. In this case, the moving distance of the first convex mold 11 is shorter than when the mold apparatus 1 has only the first convex moving mechanism 19, and when the mold apparatus 1 has only the second convex moving mechanism. In comparison, the moving distance of the second convex mold 12 is short. Therefore, by moving the first convex mold 11 and the second convex mold 12 at the same time, step S105 can be performed in a short time and throughput can be improved.

Although the first convex moving mechanism 19 is a part of the mold device 1 in this modification, it may be provided separately from the mold device 1 or may be a part of the injection molding machine 3. Similarly, the second convex moving mechanism may be a part of the mold device 1 or may be a part of the injection molding machine 3.

Step S105 may be performed after primary molding (S102) and before secondary molding (S107), for example, it may be performed during mold opening (S103) or during rotation (S104). Alternatively, it may be performed during mold closing (S106).

In step S106, as shown in FIG. 10(A), the movable platen 34 is advanced, the second convex mold 12 and the first concave mold 13 are advanced, and mold closing, pressurization, and mold clamping are performed. During mold clamping, the first concave mold 13 and the second concave mold 14 form a third cavity space 17 in which the bonding layer 23 is molded, with the first divided product 21 and the second divided product 22 accommodated therein. do. The third cavity space 17 is formed in a ring shape at the outer edge of the abutting surfaces 21a and 22a of the first divided product 21 and the second divided product 22.

When the first concave mold 13 and the second concave mold 14 are clamped, the contact surface 11a of the first convex mold 11 and the contact surface 12a of the second convex mold 12 are pressed together, and the concave portion 11d of the first convex mold 11 is pressed together. The convex portion 12b of the second convex mold 12 is accommodated. At this time, the concave portion 11d of the first convex mold 11 also accommodates the ring portion 12c of the second convex mold 12.

Note that instead of the first convex mold 11 having the recess 11d on its abutting surface 11a, the second convex mold 12 may have a recess on its abutting surface 12a. The recess accommodates the convex portion 11b of the first convex mold 11, and also accommodates the ring portion 11c of the first convex mold 11. In this case, in step S105, the first convex mold 11 and/or the second convex mold 12 are moved to a position where the convex part 11b of the first convex mold 11 and the concave part of the second convex mold 12 are arranged facing each other. It will be done.

Further, the first convex mold 11 and/or the second convex mold 12 are made large enough to prevent the first convex mold 11 and the second convex mold 12 from coming into contact when the first concave mold 13 and the second concave mold 14 are clamped together. May be moved. In this case, one of the first convex mold 11 and the second convex mold 12 does not require a concave portion to accommodate the convex portion of the other. However, if there is a recess, the moving distance can be shortened.

In step S107, as shown in FIG. 10(B), the second injection device 39 fills the third cavity space 17 with liquid molding material. In the third cavity space 17, the molding material is cooled and solidified, and the bonding layer 23 is molded. The bonding layer 23 is formed in a ring shape on the outer edges of the abutting surfaces 21a and 22a of the first divided product 21 and the second divided product 22. The bonding layer 23 welds the first divided product 21 and the second divided product 22 together. As a result, a hollow molded product 2 is molded.

In step S108, as shown in FIG. 11(A), the movable platen 34 is retreated, the second convex mold 12 and the first concave mold 13 are retreated, and depressurization and mold opening are performed. The hollow molded product 2 is moved back together with the first recessed mold 13 while being attached to the first recessed mold 13, and is released from the second recessed mold 14.

In step S109, as shown in FIG. 11(B), a take-out machine (not shown) takes out the hollow molded product 2 from the mold device 1. The hollow molded product 2 is taken out from the first concave mold 13. In this way, a hollow molded product 2 is obtained.

Note that in step S108, the hollow molded product 2 adheres to the first concave mold 13 in this modification, but it may also adhere to the second concave mold 14 and be released from the first concave mold 13. In the latter case, the hollow molded product 2 is taken out from the second concave mold 14 in step S109.

Although the embodiments of the mold apparatus according to the present invention have been described above, the present invention is not limited to the above embodiments. Various changes, modifications, substitutions, additions, deletions, and combinations are possible within the scope of the claims. These naturally fall within the technical scope of the present invention.

The rotary disk 33 may be rotatably supported by the fixed platen 32 instead of the movable platen 34. In this case, the first convex mold 11 and the second concave mold 14 are attached to the movable platen 34 instead of the fixed platen 32. In this case, the movable platen 34 corresponds to the platen described in the claims.

The second convex moving mechanism 18 moves the second convex mold 12 only in one of the mold opening/closing direction (for example, the X-axis direction) and the orthogonal direction (for example, the Y-axis direction or the Z-axis direction). , may be moved in both directions.

Similarly, the first convex moving mechanism 19 moves the first convex mold 11 only in one of the mold opening/closing direction (for example, the X-axis direction) and the orthogonal direction (for example, the Y-axis direction or the Z-axis direction). It may be moved in both directions.

1 Mold device 11 First convex mold 12 Second convex mold 13 First concave mold 14 Second concave mold 18 Second convex moving mechanism 19 First convex moving mechanism 2 Hollow molded product 21 First divided product 22 Second divided product 23 Bonding layer 3 Injection molding machine 32 Fixed platen (platen)
33 Turntable

Claims (5)

A mold device used for molding a hollow molded product including a first divided product, a second divided product, and a bonding layer that joins the first divided product and the second divided product,
including a first convex type, a second convex type, a first concave type, and a second concave type,
The first convex mold and the second concave mold are attached to a platen of an injection molding machine,
The second convex mold and the first concave mold are attached to a rotary disk disposed opposite to the platen of the injection molding machine,
The first convex mold and the first concave mold form a first cavity space in which the first divided product is molded,
The second convex mold and the second concave mold form a second cavity space in which the second divided product is molded,
The first concave mold and the second concave mold form a third cavity space in which the bonding layer is molded with the first divided product and the second divided product accommodated therein,
the first convex mold is movably attached to the second concave mold, and/or the second convex mold is movably attached to the first concave mold ,
At least one of a first convex moving mechanism that moves the first convex mold relative to the second concave mold, and a second convex moving mechanism that moves the second convex mold relative to the first concave mold. including mold equipment. The mold apparatus according to claim 1, wherein the first convex moving mechanism moves the first convex mold in a mold opening/closing direction with respect to the second concave mold. The mold device according to claim 1 or 2, wherein the second convex moving mechanism moves the second convex mold in a mold opening/closing direction with respect to the first concave mold. The mold device according to any one of claims 1 to 3 , wherein the first convex moving mechanism moves the first convex mold in a direction perpendicular to a mold opening/closing direction with respect to the second concave mold. The mold apparatus according to any one of claims 1 to 4 , wherein the second convex moving mechanism moves the second convex mold in a direction perpendicular to a mold opening/closing direction with respect to the first concave mold.

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