JP2013132812A - Injection molding machine for multi-material molding, and its molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine for multi-material molding that is provided with a spinning disk that is rotated on an axis in a direction orthogonal to a mold opening/closing direction and can be fitted with an intermediate metal mold between a first disk to which a first metal mold can be fitted and a second disk to which a second metal mold can be fitted, the injection molding machine for multi-material molding capable of molding three or more multi-materials in a relatively small space.SOLUTION: An injection molding machine 11 for multi-material molding that is provided with a spinning disk 25 which is rotated on an axis in a direction orthogonal to a mold opening/closing direction and can be fitted with an intermediate metal mold 27 between a first disk 17 to which a first metal mold 18 can be fitted and a second disk 19 to which a second metal mold 20 can be fitted, provided with a first injection device 14 outside the first disk 17, and provided with a second injection device 15 outside the second disk 19 is further provided with a third injection device 16 that has smaller total weight than the first injection device 14.

Description

According to the present invention, the first plate on which the first mold can be attached and the second plate on which the second die can be attached are rotated around an axis perpendicular to the mold opening / closing direction. The present invention relates to an injection molding machine for multi-material molded products provided with a turntable to which an intermediate mold can be attached, and a molding method therefor.

The intermediate mold is rotated about an axis perpendicular to the mold opening / closing direction between the first board to which the first mold can be attached and the second board to which the second mold can be attached. As an injection molding machine of a multi-material molded product provided with an attachable turntable, those described in Patent Document 1 to Patent Document 4 are known. Among them, the types described in Patent Document 1 to Patent Document 3 are arranged such that a rotating plate and a movable plate in which a fixed plate and an intermediate mold are rotatable are arranged in order, and the rotating plate and the movable plate are respectively in the mold opening / closing direction. In Patent Document 4, a fixed plate having an intermediate mold rotatably provided is arranged at the center, and a movable plate movable in the mold opening / closing direction is arranged on both sides thereof. is there. Moreover, the arrangement of the injection device is different in Patent Document 2, and one injection device is attached in a direction orthogonal to the mold opening / closing direction. In these Patent Document 1 and Patent Document 4, the first injection device and the second injection device are provided outside the mold opening / closing direction of the mold clamping device. Further, in Patent Document 2 and Patent Document 3, the injection molding machine for a multi-material molded product described in Patent Document 2 and Patent Document 3 is attached so that one injection device is directed in a direction orthogonal to the mold opening / closing direction. .

  For this reason, the multi-material injection molding machines of Patent Document 1 and Patent Document 4 have an advantage that the apparatus can be accommodated in the vertical direction, and the layout of the factory installation is easy to perform. And the injection molding machine of the multi-material molded product of the type of patent document 1 and patent document 4 is prevailing. On the other hand, there is no description in any document that molding of three different materials using an injection device for multi-material molded products. Slightly Patent Document 3 describes that a multi-material molded product is molded using three injection devices. However, whether or not it is a three-color multi-material molded product and the size of the injection device are described. There is no explicit statement. The arrangement of the injection device in Patent Document 3 is that one injection device is arranged behind the fixed platen, but the other two are arranged on both sides orthogonal to the mold opening / closing direction, so the devices are arranged in the width direction. There was a problem that space was taken up and it was difficult to lay out the factory.

Further, Patent Citation 5 discloses that a mold is clamped in the vertical direction and a plurality of molds are arranged on a rotary table, and three injection devices are arranged around the mold clamping direction. What has been described is known. However, Patent Document 5 is an arrangement in which a plurality of cavities are arranged on a plane and the cavities are simultaneously clamped, so that the plurality of cavities overlap in the mold opening and closing direction. The type shown in FIG. 4 requires a smaller clamping force when molding the same molded product, and is suitable for molding a molded product having a large area.

Japanese Patent Laid-Open No. 7-195413 (Claim 1 FIG. 1) JP-A-11-105072 (Claim 1, FIG. 1) Japanese Examined Patent Publication No. 3-38095 (Claim 1, fig2) JP-A-6-254906 (Claim 1, FIG. 1) JP-A-3-7315 (Claim 1, FIG. 1)

As described above, the injection molding machine for multi-material molded products of the types of Patent Document 1 to Patent Document 4 requires only a small clamping force when molding the same molded product, but conventionally, two-color molding is mainly used. It has not been clarified whether or not molding of at least three colors is performed, and an efficient layout of an injection apparatus has not been considered particularly when molding of at least three colors is performed. In particular, in the injection molding machine of the multi-material molded products of the types of Patent Document 1 and Patent Document 4 having the highest layout effectiveness, it has not been considered to mold multi-material molded products of at least three colors or more. . Therefore, in the present invention, the first board on which the first mold can be attached and the second board on which the second mold can be attached are rotated around an axis perpendicular to the mold opening / closing direction. A multi-material injection molding machine provided with a turntable to which an intermediate mold can be attached, and a multi-material injection molding machine capable of molding at least three or more multi-materials without taking up relatively space. The purpose is to provide.

Further, in relation to the above, an axis in a direction orthogonal to the mold opening / closing direction is centered between the first board to which the first mold can be attached and the second board to which the second mold can be attached. In a multi-material injection molding machine provided with a turntable on which an intermediate mold can be mounted, when moving at least three colors or more, movable parts such as cores inside the mold are eliminated. An object of the present invention is to provide a method for forming a multi-material molded product, which can be formed into a multi-material molded product using a mold having a less complicated structure. It is another object of the present invention to provide a multi-material molded product in which burrs such as a mold having a core are not formed using the above-described multi-material molded product injection molding machine.

According to a first aspect of the present invention, there is provided an injection molding machine comprising: a mold opening / closing direction between a first board on which a first mold can be attached and a second board on which a second mold can be attached. A rotating disk that is rotated around an axis in the orthogonal direction and on which an intermediate mold can be attached is provided, a first injection device is provided outside the first board, and a second injection is provided outside the second board. The multi-material molded product injection molding machine provided with the apparatus is characterized in that a third injection apparatus having a total weight smaller than that of the first injection apparatus is provided.

The injection molding machine according to claim 2 of the present invention is the multi-material injection molding machine according to claim 1, wherein the first injection device, the second injection device, and the third injection device are: Each is provided directly on the bed or above the bed.

An injection molding machine according to a third aspect of the present invention is the injection molding machine for a multi-material molded product according to the second or second aspect, wherein the first molding machine, the second board, the intermediate board or the first molding machine. A third injection device is attached downward to a member above the region where the second and intermediate plates move.

According to a fourth aspect of the present invention, there is provided an injection molding machine according to any one of the first to third aspects, wherein two intermediate members mounted on a turntable are provided. The molds are characterized by different cavity shapes.

The injection molding method according to claim 5 of the present invention is the first molding formed between the first mold and one intermediate mold using the multi-material injection molding machine according to claim 4. The first material is injected from the first injection device into the cavity of the first mold to form a primary molded product, and one of the intermediate molds holding the primary molded product is opened and inverted, and then re-molded. The second material is injected from the second injection device into the second cavity formed between the intermediate mold and the second mold, which are closed and holding the primary molded product, and is subjected to secondary molding. In the state where the product is molded and the secondary molded product is held in the second mold, the other intermediate mold is inverted after the mold is opened, and then the mold is closed again, and the other intermediate mold and the second mold are closed. A third material is injected from a third injection device into a third cavity formed between the molds to form a multi-material molded product.

The multi-material injection molding machine of the present invention is orthogonal to the mold opening / closing direction between a first plate on which a first mold can be attached and a second plate on which a second mold can be attached. A rotating plate that is rotated about an axis in the direction to which the intermediate mold can be attached is provided, a first injection device is provided outside the first plate, and a second injection device is provided outside the second plate. In a multi-material injection molding machine provided with a third injection device having a total weight smaller than that of the first injection device, a multi-material molded product consisting of three materials can be efficiently molded. it can.

It is a side view of the injection molding machine of the multi-material molded product of this embodiment. It is a top view of the injection molding machine of the multi-material molded product of this embodiment. It is a top view of the injection molding machine of the multi-material molded product of another embodiment. It is a top view of the injection molding machine of the multi-material molded product of another embodiment. It is a 1st injection molding method using the injection molding machine of the multi-material molded product of this embodiment, and is a figure showing the state where the 1st material was injected. It is the 1st injection molding method using the injection molding machine of the multi-material molded product of this embodiment, and is a figure showing the state where the 2nd material and the 3rd material were injected. It is a 2nd injection molding method using the injection molding machine of the multi-material molded product of this embodiment, and is a figure showing the state where the 1st material was injected. It is a 2nd injection molding method using the injection molding machine of the multi-material molded product of this embodiment, and is a figure showing the state where the 2nd material was injected. It is the 2nd injection molding method using the injection molding machine of the multi-material molded product of this embodiment, and is a figure showing the state where the 3rd material was injected. It is a 2nd injection molding method using the injection molding machine of the multi-material molded product of this embodiment, and is a figure showing the state where a multi-material molded product is taken out.

An injection molding machine 11 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. The injection molding machine 11 is an injection molding machine having a function of joining a plurality of resin materials to form a multi-material molded product. On the bed 12, a mold clamping device 13, a first injection device 14, and a first Two injection devices 15 are provided, and a third injection device 16 is provided above the bed 12.

In the mold clamping device 13, a fixed mold 18 as a first mold is attached to a fixed plate 17 as a first board fixed to the bed 12, and a movable mold is attached to a movable plate 19 as a second board. 20 is attached. Clamping cylinders 21 are provided in the vicinity of the four corners of the fixed platen 17, and the rods are also inserted as tie bars 22 in the vicinity of the four corners of the movable platen 19. Further, a locking portion (not shown) is provided on the outer periphery of the tie bar 22, and a half nut 23 is provided in the vicinity of a portion where the tie bar 22 is inserted on the outer wall surface of the movable platen 19. The movable platen 19 is guided by the tie bar 22 on the bed 12 by the mold opening / closing mechanism 24 and can move in the mold opening / closing direction.

Further, between the fixed platen 17 and the movable platen 19, there is provided a rotary plate 25 that is rotated around an axis (generally a vertical axis) in a direction orthogonal to the mold opening / closing direction. In this embodiment, a guide on the bed 12 and an intermediate plate 26 guided by the tie bar 22 and moved in the mold opening / closing direction are provided between the fixed platen 17 and the movable platen 19. A turntable 25 is provided rotatably (or 180 ° reversible) via a bearing (not shown). In addition, a motor 30 for rotating the rotary disc 25 is attached to the intermediate disc 26. Intermediate molds 27 are attached to both surfaces of the rotating disk 25, respectively. However, the rotating disk 25 may be provided such that the rotating disk 25 is rotatably provided on the bed 12 without providing the intermediate disk 26 inserted through the tie bar 22. Alternatively, the rotating disk 25 and the intermediate mold 27 may be integrated. In any type, the rotating plate 25 can be moved in the mold opening / closing direction by the moving mechanism 28 with respect to the fixed platen 17. For ease of understanding in FIG. 2, only one mold opening / closing mechanism 24 and one movement mechanism 28 are shown, but the number is not limited to one and may be two or four.

  The mechanism of the mold clamping device 13 is not limited to the above, and a mold clamping cylinder may be provided on the movable platen side. The mold opening / closing mechanism for moving the movable platen is not only between the fixed platen and the movable platen, It may be provided between the bed and the movable board or between the intermediate board and the movable board. The intermediate plate moving mechanism may also be provided between the movable platen and the intermediate plate, as well as between the fixed platen and the intermediate plate. As another mold clamping device, an intermediate plate is fixedly provided on the bed, and a rotary plate to which the intermediate die is attached is rotatably provided on the intermediate plate, and the first die is provided on both sides thereof. The first board to which the second mold is attached and the second board to which the second mold is attached may be provided so as to be movable toward the center.

  The injection devices 14, 15, and 16 are provided directly on the bed 12 or above the bed 12. Each of the injection devices 14, 15, 16 is a general one having a driving device, a heating cylinder containing a screw, and a nozzle fixed to the front portion of the heating cylinder. A first injection device 14 is provided on the bed 12 outside the fixed platen 17 (opposite to the rotary plate 25) such that the longitudinal direction (nozzle direction) coincides with the mold opening / closing direction. Like the general injection molding machine, the first injection device 14 moves forward and backward with respect to the fixed mold 18, but does not move in synchronization with the operation of the movable platen 19 when the mold is opened and closed. Therefore, the largest injection device 13 is usually provided. For example, in the case of molding a multi-material molded product comprising a window and a window frame, it is used for injection of a transparent resin for molding a transparent window portion. A second injection device 15 is provided on the platform that moves together with the movable platen 19 above the bed 12 outside the movable platen 19 so that the longitudinal direction (nozzle direction) coincides with the mold opening / closing direction. In other words, the first injection device 14 and the second injection device 15 are provided to face each other. Since the second injection device 15 moves synchronously with the mold opening / closing movement of the movable platen 19, the second injection device 15 may be the same size as the first injection device 13, but is often smaller than the first injection device 13.

In the present embodiment, a portal frame 29 is provided so as to straddle the two upper tie bars 22 of the mold clamping device 13. The frame 29 is provided with a third injection device 16 from above to below. Therefore, the third injection device 16 is provided above the bed 12 and the mold clamping device 13. In the present embodiment, the third injection device 16 is provided with its longitudinal direction (nozzle direction) directed in a direction orthogonal to the mold opening / closing direction. The third injection device 16 is movable in the vertical direction. When the intermediate plate 26 including the rotating plate 25 and the movable platen 19 are respectively clamped and moved, nozzle holes are formed in the resin injection holes of the movable die 20. Contact is possible. Note that the abutted portion may be the fixed mold 18 or the intermediate mold 27, or may be the fixed platen 17, the rotary plate 25, or the movable platen 18. Further, the third injection device 16 may be attached in an oblique direction with respect to the vertical direction. In the present embodiment, the third injection device 16 is smaller in total weight and maximum injection amount than the second injection device 15. However, the third injection device 16 is an injection device having a smaller total weight and maximum injection amount than at least the first injection device 14. The maximum injection amount of the injection device is substantially determined by the product of the screw diameter and the maximum forward stroke of the screw. The total weight of the injection device is the weight of the portion where the injection device itself is moved independently, including the hopper portion but not the supply pipe.

The third injection device 16 can easily perform additional work on the multi-material injection molding machine 11 provided with only the first injection device 14 and the second injection device 15. When the third injection device 16 is provided in the vertical direction, it may be attached to a member above the area where the second plate moves as shown in FIG. 1 or the like, and the fixed plate 17, intermediate plate 26, or movable plate 19 may be attached. Alternatively, it may be directly attached to the attachment member. If it is not located on the bed 12, it may be disadvantageous in the factory layout, but if there is no such problem, as shown in FIG. 3, the third injection device 16a in a direction perpendicular to the mold opening / closing direction as seen in plan view. May be provided. Of course, the direction of the third injection device 16a is not limited to the direction orthogonal to the mold opening / closing direction, and may be provided in an oblique direction. Also in this case, since the third injection device 16a has a smaller total weight than the first injection device 14, the space required outside the bed 12 can be reduced.

In the example of FIG. 4, a third injection device 16 b is provided in parallel with the first injection device 14 outside the fixed platen 17. Although not shown, a third injection device 16b may be provided in parallel with the second injection device 15 on the movable platen 19 side. When the third injection device 16b is arranged in this way, the injection devices 14, 15, 16b can be arranged in a compact manner on the base 12, and the operator can also include the third injection device 16, including the third injection device 16. Maintenance of 16b can be easily performed. In the case of FIG. 4, the relationship between the first injection device 14 and the third injection device 16b is provided in parallel, but the axis of the first injection device 14 (nozzle direction) and the third injection device 16b. As long as the axis of the nozzle (the direction of the nozzle) is within a range of 30 °, it may be used. However, in the example of FIG. 4, it is necessary to enlarge the hole in the portion where the nozzle of the fixed platen 17 or the movable platen 19 on the side where two injection devices 16 b are provided. Although only the third injection devices 16, 16a, and 16b have been described in the examples of FIGS. 1 to 4, the number of injection devices such as the fourth injection device and the fifth injection device is similarly provided. It is also possible.

Next, a method for molding a multi-material molded product of the present invention will be described. First, the first forming method will be described with reference to FIG. 1 and the like with reference to FIG. 5 and FIG. 6 which are schematically described. First, with respect to the stationary mold 18 attached to the stationary platen 17 of the multi-material injection molding machine 11, one intermediate die 27 attached to the rotary plate 25 is closed to form a primary cavity. . At this time, the movable mold 20 attached to the movable board 19 is closed with respect to the other intermediate mold 27 attached to the rotating board 25. The first resin material is injected from the first injection device 16 into the primary cavity 31 between the fixed mold 18 and one intermediate mold 27 in a state where the mold is clamped by the mold clamping cylinder 21 of the mold clamping device 13. Thus, the primary molded product A is molded. Then, the mold opening / closing mechanism 24 for moving the movable platen 19 and the moving mechanism 28 for moving the rotary platen 25 are driven so that the fixed die 18 and one intermediate die 27, the other intermediate die 27 and the movable die 20 are moved. Each mold is opened. At this time, the primary molded product A is opened in a state where it is stuck to the surface of one intermediate mold 27.

  Next, the motor 30 is driven to invert the turntable 25 by 180 ° so that one intermediate mold 27 to which the primary molded product A is attached is opposed to the movable mold 20. Then, the mold opening / closing mechanism 24 and the moving mechanism 28 are driven again to close the stationary mold 18 and the other intermediate mold 27, and the one intermediate mold 27 and the movable mold 20. At that time, a secondary cavity 32 capable of molding a secondary molded product and a tertiary molded product can be molded between the intermediate mold 27 and the movable mold 20 to which the primary molded product A is stuck. A tertiary cavity 33 is formed. Then, as shown in FIG. 6, the second resin material is injected into the secondary cavity 32 from the second injection device 15 provided on the opposite side of the movable platen 19. A third resin material is injected into the tertiary cavity 33 from a third injection device 16 provided above. The secondary injection from the second injection device 15 and the tertiary injection from the third injection device 16 are usually performed while shifting the time, but they may be performed simultaneously. In addition, the tertiary cavity 33 is not formed at the time of the secondary injection after the mold is closed, and the secondary cavity 33 is moved by moving the core of the molding intermediate mold 27 or the core of the movable mold 20 after the secondary injection. And a third resin material may be injected. In any case, in the first molding method, secondary molding and tertiary molding are performed from the second injection device 15 and the third injection device 16 during the mold clamping state. At the same time, the next primary molded product A is molded between the fixed mold 18 and the other intermediate mold 27 at the same time or at different times. Therefore, the shape of one intermediate mold 27 and the other intermediate mold 27 is the same.

Then, although not shown in the figure, the space between the one intermediate mold 27 and the movable mold 19 is opened, and the multi-material molded product B (finished product) is usually stuck to the one intermediate mold 27. The mold is released and ejected by an ejector (not shown) of the intermediate mold 27. In the above, primary molding and secondary molding are performed between the fixed mold 18 (first mold) and the intermediate mold 27, and only the tertiary molding is performed between the intermediate mold 27 and the movable mold 20 (first mold). 2 molds). Alternatively, only primary molding is performed between the movable mold 20 (second mold) and the intermediate mold 27, and secondary molding and tertiary molding are performed with the fixed mold 18 (first mold) and the intermediate mold. It is performed between the molds 27, or primary molding and secondary molding are performed between the movable mold 20 (second mold) and the intermediate mold 27, and only tertiary molding is performed with the fixed mold 18 and the intermediate mold. It may be performed between the molds 27. Moreover, you may perform after 4th shaping | molding according to a variation.

In these moldings, the primary molding may be performed by injection compression molding in which the molten resin material in the primary cavity 31 is compressed by injecting with the gaps being spaced apart. You may compress after opening a cavity. Further, secondary molding or tertiary molding may be compression molding. When performing compression molding, the four mold clamping cylinders 21 may be controlled separately to control the distance between the molds in parallel. The mold is not limited to a cold runner or a hot runner, and may be one that heats and cools the mold as well as cools the mold. The material used for the molding is not limited, but as an example, the primary molding is a transparent material such as polycarbonate or acrylic, the secondary molding is a colored resin or an elastomer material, the tertiary molding is a thin film forming material by injection molding, It is good also as a coating material.

Next, the second molding method of the multi-material molded product of the present invention will be described with reference to FIG. 1 and the like, with reference to FIGS. The two intermediate molds 34 and 35 attached to the stationary platen 17 used in the second molding method are characterized in that the shapes of the cavity surfaces are different. First, with respect to the fixed mold 18 attached to the fixed platen 17, one intermediate mold 34 attached to the rotating plate 25 is closed to form a primary cavity 36. At this time, the movable mold 20 attached to the movable board 19 is closed with respect to the other intermediate mold 35 attached to the rotating board 25. Then, as shown in FIG. 7, the first injection device is inserted into the primary cavity 36 between the fixed die 18 and one intermediate die 34 while being clamped by the clamping cylinder 21 of the clamping device 13. The first resin material is injected from 14 to form a primary molded product B. Then, the mold opening / closing mechanism 24 for moving the movable platen 19 and the moving mechanism 28 for moving the rotary plate 25 are driven, so that the fixed die 18 and one intermediate die 34, the other intermediate die 35 and the movable die 20 are moved. Open the space. At this time, the primary molded product C is opened in a state where it is stuck to the surface of one intermediate mold 34.

  Next, the motor 30 is driven to invert the turntable 25 by 180 °, and the one intermediate mold 34 to which the primary molded product C is attached is opposed to the movable mold 20. Then, the mold opening / closing mechanism 24 and the moving mechanism 28 are driven again to close the fixed mold 18 and the other intermediate mold 35, and the one intermediate mold 34 and the movable mold 20. At this time, a secondary cavity 37 capable of molding the secondary molded product is formed between the intermediate mold 34 to which the primary molded product B is stuck and the movable mold 20. As shown in FIG. 8, the second resin material is injected into the secondary cavity 37 from the second injection device 15 provided on the opposite side of the movable platen 19. In this embodiment, the tertiary molding is not performed in this state, and the next primary molding is not performed between the fixed mold 18 and the other intermediate mold 35.

When the cooling of the secondary molding is completed, the stationary mold 18 and the other intermediate mold 35, and the one intermediate mold 34 and the movable mold 20 are opened again. At this time, the intermediate molded product D that has been subjected to the secondary molding is attached to the movable mold 20 side and released. Next, two intermediate molds 34 having different shapes and the other intermediate mold 35 are inverted by 180 °. Then, as shown in FIG. 9, the fixed mold 18 and one intermediate mold 34, and the other intermediate mold 35 and the movable mold 20 are closed again. By doing so, a tertiary cavity 38 is formed between the other intermediate mold 35 and the movable mold 20 in addition to the intermediate molded product D in which the secondary molding has been completed. Then, as shown in FIG. 9, the third resin material is injected from the third injection device 16 into the tertiary cavity 38. At this time, the next primary molded product C is molded in the primary cavity 36 between the fixed mold 18 and one intermediate mold 34.

Then, as shown in FIG. 10, the other intermediate mold 35 and the movable mold 20 are opened, and the multi-material molded product E that has been molded is taken out. At this time, the multi-material molded product E may be stuck to one intermediate mold 34 and released and protruded, or may be attached to the movable mold 20 and released and protruded. By performing this molding method, the mold structure can be simplified, although the productivity is inferior to that of the above-described FIGS. In particular, in contrast to the case where the core is moved in FIGS. 5 and 6, when the core is moved, burrs are formed between the core and the other cavity surface, but in the case of the second molding method, There is no worry about Bali. Further, it is possible to attach the secondary molding and the tertiary molding to the both sides of the primary molded product C. The third cavity 38 can also have a large area that is close to or coincides with the shape of the primary cavity 36, and the resin material is injected into the multilayer from the third injection device 16 there. be able to.

Alternatively, the third injection device 16 may be a coating device or a coating device that ejects a liquid (including a viscous material). In that case, the third injection device 16 performs coating or coating on a multi-material molded product of a combination of two colors of resins. be able to.

6 to 10 also, the first and second molds on both sides move open and close toward the center without moving the rotating disk provided in the center. It goes without saying that a type of injection molding machine can be used. Needless to say, compression molding can be used. The present invention is not enumerated one by one, but is not limited to the one described above, and it goes without saying that the present invention is also applied to those modified by a person skilled in the art based on the gist of the present invention.

DESCRIPTION OF SYMBOLS 11 Injection molding machine 12 Bed 13 Clamping apparatus 14 1st injection apparatus 15 2nd injection apparatus 16, 16a, 16b 3rd injection apparatus 17 Fixed platen 18 Fixed mold (1st mold)
19 Movable platen 20 Movable mold (second mold)
25 Rotary plate 26 Intermediate plate 27, 34, 35 Intermediate mold A, C Primary molded product B, E Multi-material molded product D Intermediate molded product

Claims (5)

The intermediate mold is rotated about an axis perpendicular to the mold opening / closing direction between the first board to which the first mold can be attached and the second board to which the second mold can be attached. In a multi-material injection molding machine provided with a mountable turntable, a first injection device provided outside the first plate, and a second injection device provided outside the second plate ,
An injection molding machine for multi-material molded products, wherein a third injection device having a total weight smaller than that of the first injection device is provided. 2. The multi-material molded article according to claim 1, wherein the first injection device, the second injection device, and the third injection device are provided directly on or above the bed, respectively. Injection molding machine. The third injection device is attached to the first board, the second board, the intermediate board directly or to the upper member of the area where the second board or the intermediate board moves, and directed downward. An injection molding machine for a multi-material molded product according to claim 2. The injection molding machine for multi-material molded products according to any one of claims 1 to 3, wherein the two intermediate molds attached to the turntable have different cavity shapes. The first injection device to the first cavity formed between the first mold and the one intermediate mold using the multi-material injection molding machine according to claim 4. An intermediate mold in which a material is injected to form a primary molded product, one of the intermediate molds holding the primary molded product is opened and inverted, and then the mold is closed again to hold the primary molded product A second material is injected from a second injection device into a second cavity formed between the second mold and the second mold to form a secondary molded product. With the mold held, the other intermediate mold is inverted after the mold is opened, and then the mold is closed again. With respect to the third cavity formed between the other intermediate mold and the second mold, A molding method for a multi-material molded product, wherein a third material is injected from a third injection device to mold a multi-material molded product.