CN106003567A - Injection molding machine for molding composite molded article - Google Patents

Abstract

The invention provides an injection molding machine for molding a composite molded article, which is provided with at least three injection devices, and ensures the change of molding. In an injection molding machine (11) for molding a composite molded article, which is provided with intermediate molds (30, 30) that rotate about an axis in a direction orthogonal to a mold opening and closing direction and that are arranged between a first mold platen (18) to which a first mold (20) is attached and a second mold platen (21) to which a second mold platen (22) is attached so as to be capable of being clamped with the first mold platen and the second mold platen, the injection molding machine being provided with at least three injection devices (14, 15, 17), the injection molding machine being provided with a plurality of injection devices capable of injecting a molten material into a cavity formed between the first mold platen and the intermediate mold platen and an injection device capable of injecting a molten material into a cavity formed between the second mold platen and the intermediate mold platen, at least one of the plurality of injection devices being arranged so as to be movable in a direction (B) other than a screw axis.

Description

Injection molding machine for composite molded products

technical field

The present invention relates to an injection molding machine for molding composite molded articles.

Background technique

Between the first clamping plate on which the first metal mold is mounted and the second clamping plate on which the second metal mold is mounted, an opening and closing mechanism is provided so as to be able to clamp the first metal mold and the second metal mold. Injection molding machines described in Patent Documents 1 to 3 are known as injection molding machines for molding composite molded products in which an intermediate mold rotates around an axis perpendicular to the mold direction. Patent Document 1 includes injection devices on the outside of one of the fixed clamping plates as the first clamping plate or the second clamping plate and on the outside of the movable clamping plate as the other. And, the mode that makes the middle metal mold rotate makes the primary molded product formed between the first metal mold and the middle metal mold and the second metal mold close the mold, and the secondary mold is performed between the second metal mold and the middle metal mold. Forming is performed to form a composite molded product (or the molding of a molded product may be performed first between the second metal mold and the intermediate metal mold.).

However, this injection molding machine for molding composite molded articles can only mold composite molded articles made of two kinds of resin materials, and cannot cope with various variations. On the other hand, an injection molding machine described in Patent Document 2 is known as an injection molding machine for molding a composite molded product capable of molding a composite molded product of three types of resin materials. In the example shown in FIG. 1 of Patent Document 2, one injection device is provided outside the fixed clamping plate, one injection device is provided outside the movable clamping plate, and one injection device is provided above the movable mold and the intermediate mold. In addition, in the example of FIG. 3, one injection device is provided outside the fixed clamping plate, one injection device is provided outside the movable clamping plate, and one injection device is provided above the movable mold and the intermediate mold. In addition, in the example of FIG. 4, two injection devices are provided outside the fixed clamping plate, and one injection device is provided outside the movable clamping plate.

In addition, Patent Document 3 performs two-color molding in the same manner as Patent Document 1, but as described in the fifth molding example and the sixth molding example, it is described that the first cavity and the first cavity formed as both sides are formed without rotating the rotary clamping plate. The point that the second cavity can also form a single-color molded product.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2011-178095 (Claim 1, 0030, FIG. 1 )

Patent Document 2: Japanese Patent Laid-Open No. 2013-132812 (Claim 1, FIG. 1, FIG. 3, FIG. 4)

Patent Document 3: Japanese Patent Laid-Open No. 2011-56774 (Claim 1, 0055, 0057, FIG. 7, FIG. 8)

However, Patent Document 2 is based on the premise that all the injection devices are used to mold the composite molded product in any of the examples, so it is not a structure that assumes various molding methods. In addition, Patent Document 3 presupposes molding of a single-color molded product, and does not describe any modification of an injection molding machine for molding a composite molded product including at least three injection devices.

Contents of the invention

In the present invention, in view of the above-mentioned problems, it is an object to provide a joint between the first clamping plate for the installation of the first metal mold and the second clamping plate for the installation of the second metal mold. The method of mold clamping is provided on the basis of an injection molding machine for molding composite molded products with an intermediate metal mold that rotates around an axis perpendicular to the direction of mold opening and closing, and at least three injection devices. An injection molding machine for molding composite molded products capable of ensuring molding variation.

The injection molding machine for molding a composite molded product according to claim 1 of the present invention can be combined with the above-mentioned first clamping plate between the first clamping plate on which the first metal mold is mounted and the second clamping plate on which the second metal mold is mounted. The method of clamping the metal mold and the second metal mold is provided with an intermediate mold that rotates about an axis perpendicular to the mold opening and closing direction, and at least three injection devices are provided, and the injection molding for molding composite molded products described above The machine is characterized in that it includes a plurality of injection devices capable of injecting molten material into a cavity formed between the first mold and the intermediate mold, and a mold cavity formed between the second mold and the intermediate mold. An injection device for injecting molten material into a cavity, wherein at least one injection device among the plurality of injection devices is configured to be movable in a direction other than the screw axis.

The injection molding machine for molding composite molded products according to claim 2 of the present invention is based on claim 1, characterized in that the plurality of injection devices are mounted on the same support table, and can simultaneously move along other than the screw axis. direction to move.

The injection molding machine for molding a composite molded article according to claim 3 of the present invention is characterized in that, in addition to claim 1, the plurality of injection devices are mounted on different support stands, and at least one injection device can Move in a direction other than the screw axis.

The injection molding machine for a composite molded article according to claim 4 of the present invention is capable of contacting the first metal mold between the first clamping plate on which the first metal mold is mounted and the second clamping plate on which the second metal mold is mounted. The method of clamping the mold and the second metal mold is provided with an intermediate mold that rotates about an axis perpendicular to the direction of opening and closing the mold, and at least three injection devices are provided, and the above injection molding machine for composite molded products The present invention is characterized by comprising a plurality of injection devices capable of injecting molten material into a cavity formed between the first mold and the intermediate mold, and injecting the molten material into a cavity formed between the second mold and the intermediate mold. The injection device for the molten material can be selected to form a composite molded product using an injection device capable of injecting a molten material into the cavity formed between the plurality of injection devices, the second mold, and the intermediate mold. and molding of a composite molded product using an injection device capable of injecting molten material into a cavity formed between one of the plurality of injection devices, the second mold, and the intermediate mold.

The injection molding machine for molding a composite molded product according to claim 5 of the present invention can be combined with the above-mentioned first clamping plate between the first clamping plate on which the first metal mold is mounted and the second clamping plate on which the second metal mold is mounted. The method of clamping the metal mold and the second metal mold is provided with an intermediate mold that rotates about an axis perpendicular to the mold opening and closing direction, and at least three injection devices are provided, and the injection molding for molding composite molded products described above The machine is characterized in that it includes a plurality of injection devices capable of injecting molten material into a cavity formed between the first mold and the intermediate mold, and a mold cavity formed between the second mold and the intermediate mold. The injection device for injecting the molten material into the cavity can selectively use a plurality of the plurality of injection devices and inject the compound of the molten material into the cavity formed between the first metal mold and the intermediate metal mold without rotating the above-mentioned intermediate mold. Forming of molded products.

The effects of the present invention are as follows.

Between the first clamping plate on which the first metal mold is mounted and the second clamping plate on which the second metal mold is mounted in the present invention, there is provided a mold-clamping mechanism with the above-mentioned first metal mold and the second metal mold. On the basis of an injection molding machine for molding composite molded products with an intermediate mold that rotates around an axis that is perpendicular to the mold opening and closing direction and that includes at least three injection devices, it is equipped with A plurality of injection devices for injecting molten material into cavities between the intermediate metal molds and an injection device capable of injecting molten material into cavities formed between the second metal mold and the intermediate metal mold, at least one of the plurality of injection devices One injection unit is configured to be able to move in directions other than the screw axis, so it is possible to ensure molding changes.

Description of drawings

1 is a plan view showing a part of an injection molding machine for molding a composite molded product according to an embodiment of the present invention in cross section, and is a view showing a mold opening state and a retraction state of an injection device.

2 is a plan view showing a part of the injection molding machine for molding a composite molded product according to an embodiment of the present invention in cross section, and is a view showing a state in which the mold is closed and the state in which the injection device is advancing.

Fig. 3 is a plan view of a plurality of injection devices according to the embodiment of the present invention.

Fig. 4 is a side view showing a part of a plurality of injection devices according to the embodiment of the present invention in section.

5 is a view showing a second molding method of the injection molding machine for molding composite molded articles according to the embodiment of the present invention.

6 is a view showing a third molding method of the injection molding machine for molding composite molded articles according to the embodiment of the present invention.

7 is a diagram showing a plan view of a plurality of injection devices of an injection molding machine for molding a composite molded product according to another embodiment and a molding method thereof.

In the picture:

11, 81—injection molding machine for composite molded products; 12, 80—pedestal; 13—mold clamping device; 14, 15, 17, 82, 83—injection device; 18—fixed clamping plate; 20, 62, 74 , 92—fixed metal mold; 21—movable clamping plate; 22,75—movable metal mold; 28—rotating clamping plate; 30—intermediate metal mold; 33,38,45,51,73,87,89,92 , 93—hydraulic cylinder; 34, 48, 84, 85—supporting platform; A—direction of mold opening and closing; B—horizontal direction orthogonal to the direction of mold opening and closing; C1, C2, C3—cavity.

detailed description

An injection molding machine 11 for molding a composite molded product according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2 . The injection molding machine 11 for molding a composite molded product is an injection molding machine having a function of molding a composite molded product using molten resin injected from another injection device. The first injection device moving unit 16 of 14 and 15 and the second injection device moving unit 18 provided with one injection device 17 .

The mold clamping device 13 is equipped with a fixed metal mold 20 as a first metal mold on a fixed clamping plate 19 as a first clamping plate fixed on the pedestal 12, and a movable clamping plate 21 as a second clamping plate is installed as a second clamping plate. The movable metal mold 22 of the metal mold. Near the four corners of the fixed clamping plate 19 are respectively provided with clamping cylinders 23 as a clamping mechanism, and their rods are also inserted into the vicinity of the four corners of the movable clamping plate 21 as pull rods 24 . On the outside of the fixed clamping plate 19 (the opposite side of the mounting surface of the fixed metal mold 20), a concave portion 19a (mortar) capable of inserting the heating cylinders 42, 59 and the nozzles 41, 46 of the two injection devices 14, 15 is formed. department). In addition, an unillustrated locking portion is provided on the outer periphery of the tie rod 24 , and a half nut 25 is provided near a portion of the outer wall surface of the movable clamping plate 21 through which the tie rod 24 is inserted. Also, a concave portion 21 a (mortar portion) into which the heating cylinder 60 and the nozzle 55 of one injection device 17 can be inserted is formed on the outer side of the movable clamping plate 21 (opposite to the mounting surface of the movable mold 22 ). Further, the movable clamping plate 21 is movable in the mold opening and closing direction A on the base 12 by the mold opening and closing mechanism 26 (movable clamping plate moving mechanism). The mold opening and closing mechanism 26 is attached to the pedestal 12 and the movable clamping plate 21, and includes a servo motor and a ball screw mechanism as drive mechanisms.

In addition, between the fixed clamping plate 19 and the movable clamping plate 21, a rotating shaft 27 (rotating shaft 27 is an axis in a vertical direction in most housings, but may also Can be the axis of the horizontal direction) as the center of the rotation of the rotating clamping plate 28. In the present embodiment, the rotating clamping plate 28 is provided so as to be freely rotatable with the rotating shaft 27 via a bearing not shown ( Or 180° free rotation). An electric motor 35 for rotationally driving the rotary clamping plate 28 is attached to the above-mentioned intermediate clamping plate 29 . Furthermore, intermediate molds 30 having the same cavity surface are respectively attached to one surface and the other surface of the rotary clamping plate 28 . Further, the rotary clamping plate 28 can move in the mold opening and closing direction A relative to the fixed clamping plate 19 or the movable clamping plate 21 by a moving mechanism 31 using a servo motor and a ball screw mechanism. In addition, for the rotating clamping plate 28, in addition to being installed so as to be able to rotate to the intermediate clamping plate 29 (including the case of being divided up and down) inserted through the tie rod 24, it may also be set so as to be able to rotate on the operating platform on which the tie rod 24 is not inserted. The middle clamping template 29 rotates. In addition, the intermediate die 30 may be directly rotatably attached to the intermediate clamping plate 29 without the rotary clamping plate 28 .

In addition, the mechanism of the mold clamping device 13 is not limited to the above, and a mold clamping cylinder may be provided on one side of the movable clamping plate 21 as the second clamping plate. In addition, a toggle mechanism may be provided on the back surface of the movable clamping plate 21, and in this case, it is also used as a mold clamping mechanism and a mold opening and closing mechanism. The opening and closing mechanism 26 of the movable clamping plate 21 and the moving mechanism 31 of the intermediate clamping plate 29 are only described as one in FIGS. The drive mechanism is not limited. In addition, the clamping device can also fix the intermediate clamping plate on the base, and the intermediate clamping plate is provided with a rotary clamping plate in a rotatable manner on which the intermediate metal mold is installed, and the first metal mold is installed on both sides. The first clamping plate and the second clamping plate on which the second metal mold is installed are respectively arranged to be able to move toward the central intermediate clamping plate. In addition, a first movable clamping plate as a first clamping plate may be provided on one side of the fixed clamping plate, and a second movable clamping plate as a second clamping plate may be provided on the other side of the first movable clamping plate. As for the clamping plate, an intermediate clamping plate and a rotary clamping plate movable in the mold opening and closing direction A are provided between the first movable clamping plate and the second movable clamping plate. In addition, multiple rotating clamping plates (or multiple sets of intermediate metal molds) may also be provided between the first clamping plate and the second clamping plate.

Next, the first injection device moving unit 16 disposed on the side of the fixed clamping plate 19 serving as the first clamping plate and on which a plurality of injection devices 14 and 15 are placed will be described with reference to FIGS. 2 , 3 , and 4 . Each of the injection devices 14 and 15 of the first injection device moving unit 16 is an injection device capable of injecting a molten material into a cavity C2 formed between the fixed mold 20 and the intermediate mold 30 as the first mold. A plurality of guide rails 32, 32 are provided on the table portion 12a on the pedestal 12 facing the horizontal direction B (operation side-the direction opposite to the operation side) orthogonal to the mold opening and closing direction. The support table 34 of the first injection device moving unit 16 is provided in a manner to slide freely in the direction B. In addition, stoppers 32a, 32b for locking the moving support table 34 are provided at both ends of the guide rails 32, 32, respectively. In addition, a hydraulic cylinder 33 as a drive mechanism for moving the support table 34 is provided on the table portion 12 a of the pedestal 12 . In the hydraulic cylinder 33, the cylinder part 33a is attached to the bracket 56, and the rod 33b is attached to the bracket 57 on the back surface of the support stand 34, This bracket 56 is provided between the guide rails 32 and 32 on the stand part 12a. In addition, the drive mechanism for moving the support table 34 may be a structure using a servo motor and a ball screw mechanism, or another mechanism such as an air cylinder.

Two injection devices 14 and 15 are placed on the support table 34 . The injection device 14 and the injection device 15 of the present embodiment are injection devices having different capabilities, but the mounting structure and the nozzle touching structure are the same, so the structure of one injection device 14 will be described. A plurality of guide rails 36, 36 are provided on the upper surface of the support table 34 toward the mold opening and closing direction on the half of the operation side, and injection molds are provided on the guide rails 36, 36 so as to be able to slide freely along the mold opening and closing direction A. Base 37 of device 14 . In addition, a hydraulic cylinder 38 of a nozzle touch mechanism for moving the base 37 and the injection device 14 is provided on the support table 34 . In the hydraulic cylinder 38 , a cylinder portion 38 a is attached to a bracket 39 , and a rod 38 b is attached to a bracket 40 on the back surface of the base 37 . In addition, the driving mechanism of the nozzle touching mechanism may be a structure using a servo motor and a ball screw mechanism, or other mechanisms such as an air cylinder.

The injection device 14 includes a heating cylinder 42 with a nozzle 41 disposed on the front and a screw not shown in the inner hole, a drive unit 43 for rotating the screw and driving forward and backward, and including a supply of water into the heating cylinder 42 . The material supply part 44 etc. of the case part of a resin material. Therefore, the axial directions of the nozzle 41 and the heating cylinder 42 coincide with the direction of the screw axis. In the present embodiment, the injection mechanism and the metering mechanism of the injection device 14 are driven by electric motors such as servo motors, but they may be hydraulically operated, and the types thereof are not limited. The other injection device 15 is smaller than the injection device 14 , but has the same structure as the injection device 14 in that the hydraulic cylinder 45 equipped with a nozzle touch mechanism moves on the guide rails 58 , 58 to move forward and backward. Furthermore, the nozzle 46 of the injection device 15 can advance together with the nozzle 42 of the injection device 14 until it comes into contact with the nozzle contact surface 54 of the fixed mold 20 . The type of the injection device 15 and the type of its nozzle touching mechanism are not limited.

The first injection device moving unit 16 has the above-mentioned structure, so each injection device 14, 15 can not only move to the mold opening and closing direction A, but also can move to the horizontal direction B (direction other than the screw axis) perpendicular to the mold opening and closing direction. )move. The main purpose of the injection devices 14 and 15 of the present invention having such a structure is to change the injection devices 14 and 15 that contact the nozzle hole 61 of the fixed metal mold 62 as will be described later. Therefore, as long as the injection devices 14 and 15 can Just move in a direction other than the screw axis. Specifically, the injection devices 14 and 15 may move along arcuate guide rails, move obliquely backward, or the like.

In addition, the arrangement of the plurality of injection devices 14, 15 may be arranged on the outside of the first clamping plate (the side opposite to the mounting surface of the fixed mold) as shown in FIG. On the upper part, on the first clamping plate, or on the side pedestal of the metal mold installed on the first clamping plate, on the ground (in this case, there may be movement directions other than the screw shaft of the injection device 14 and the mold opening and closing direction A coincides with or does not coincide with the horizontal direction B which is perpendicular to the mold opening and closing direction.). In addition, the plurality of injection devices may be provided with at least two, and may be provided with three or more.

Next, the second injection device moving unit 18 disposed on the side of the movable clamping plate 21 as the second clamping plate and provided with the injection device 17 will be described with reference to FIGS. 1 and 2 . The injection device 17 mounted on the second injection device moving unit 18 is an injection device capable of injecting molten material into a cavity C1 formed between the movable mold 22 as the second mold and the intermediate mold 30 . A plurality of guide rails 47, 47 are provided on the base 12 toward the mold opening and closing direction, and a support table 48 is provided on the guide rails 47, 47 so as to be slidable in the mold opening and closing direction A. The front end of the support stand 48 is fixed integrally with the movable clamping plate 21 or connected to the movable clamping plate 21 . Therefore, the second injection unit moving unit 18 moves together with the movable clamping plate 21 by the drive of the mold opening and closing mechanism 26 . Further, other guide rails 49 , 49 are provided on the support table 48 , and a base 50 on which the injection device 17 is directly placed is movably provided on the guide rails 49 , 49 . Moreover, the cylinder part of the hydraulic cylinder 51 which is a nozzle touching mechanism is attached to the support base 48, and the rod of the said hydraulic cylinder 51 is attached to the base 50. As shown in FIG. Further, the injection device 17 is provided to freely slide in the mold opening and closing direction A together with the base 50 by the operation of the hydraulic cylinder 51 described above. In addition, the type of mechanism for nozzle touching is not limited.

The injection device 17 has the same structure as the injection devices 14 and 15, and includes a heating cylinder 60 in which a screw is built in an inner hole, a nozzle 55 provided at the front of the heating cylinder 60, a drive unit, a supply unit, and the like. In addition, the injection device 17 may be installed on the upper part of the movable clamping plate 21, or may be positioned on the side of the movable clamping plate 21, the movable metal mold 22, or the intermediate metal mold 30, etc., in a direction perpendicular to the opening and closing of the mold. The way in the horizontal direction B is provided with nozzles. In addition, the second injection device moving unit 18 includes at least one injection device, and may include a plurality of injection devices. In addition, in the present invention, the side of the movable clamping plate 21 may be used as the first clamping plate, and a plurality of injection devices of the first injection device moving unit may be provided in series with the movable clamping plate 21 . In this case, the fixed clamping plate 19 serves as the second clamping plate, and the second injection device moving unit 18 includes at least one injection device 17 .

Capabilities of these injection devices 14, 15, and 17 are not limited, and may be the same or different, but the following various cases and the like are also conceivable. The injection unit 14 and the injection unit 17 may have the same screw diameter (thread diameter of the screw), and the injection unit 15 may have a smaller screw diameter than that. The injection device 14 may have the largest screw diameter, and the screw diameter may become smaller in the order of the injection device 17 and the injection device 15 . The injection device 14 may have the largest screw diameter, and the screw diameter may become smaller in the order of the injection device 15 and the injection device 17 . The injection device 17 may have the largest screw diameter, and the screw diameter may become smaller in the order of the injection device 14 and the injection device 15 . The injection unit 17 may have the largest screw diameter, and the injection unit 14 and the injection unit 15 may have the same screw diameter and may be smaller than the injection unit 17 .

In addition, the injection molding machine 11 for molding composite molded products includes a setting screen 52 and a control device 53 . In addition, the control device 53 controls the operation steps of the sequence control during the three-color molding using two of the multiple injection devices 14, 15 and the injection device 17 described later, and executes the operation procedure using the multiple injection devices 14, 15, Either one of 15 is stored in the storage device 53 together with the operation procedure of the sequence control of the injection device 17 during two-color molding. In addition, the control device 53 can store the sequence control operation procedure etc. when performing multi-color molding using only the plurality of injection devices 14 and 15 on the first clamping plate side without rotating the intermediate molds 30 and 30 as needed.

Next, the molding method and operation of the injection molding machine 11 for molding a composite molded product according to this embodiment will be described. First, as the first molding method, molding of a three-color composite molded product using all the first injection device moving unit 16 including the injection devices 14 and 15 and the second injection device moving unit 18 including one injection device 17 is carried out. illustrate. As shown in Fig. 1 and Fig. 2, the supporting table 34 of the moving unit 16 of the first injection device is located in the middle position, and the nozzle 41 of the injection device 14 and the nozzle 46 of the injection device 15 are respectively located at the contact surface 54 of the nozzle of the fixed metal mold 20. The position where the two nozzle holes 54a, 54b face each other. The hydraulic cylinder 38 of the nozzle touch mechanism of the injection device 14 and the hydraulic cylinder 45 of the nozzle touch mechanism of the injection device 15 are driven to the forward side, the nozzle 41 is connected to the nozzle hole 54a, and the nozzle 46 is connected to the nozzle hole 54b. The measurement of the molten resin before injection in the injection devices 14 and 15 is often carried out in a state where the nozzles 41 and 46 are in contact with each other as shown in FIG. The injection devices 14, 15 are retracted. On the other hand, the injection device 17 of the second injection device moving unit 18 performs metering with the nozzle 55 connected to the nozzle hole of the movable mold 22 in the same manner, but the metering may be performed by moving it backward.

On the other hand, one side of the mold clamping device 13 operates the mold opening and closing mechanism 26 and the moving mechanism 31 to close the fixed mold 20 and the intermediate mold 30 and the movable mold 22 and the intermediate mold 30 respectively. Then, the half nuts 25 are locked, and the mold clamping cylinder 23 is operated to perform mold clamping between the individual molds. Through the mold closing and clamping described above, as shown in FIG. 2 , a cavity C1 for primary molding is formed between the movable mold 22 and the intermediate mold 30 . In addition, a cavity C2 for secondary molding is formed between the fixed mold 20 and the intermediate mold 30 .

If the description is based on the molding process of one composite molded product, then, next, from the nozzle 55 of the injection device 17 on the side of the movable clamping plate 21 to the movable mold 22 and the intermediate mold 30 through a flow path such as a nozzle hole and a hot runner, etc. Cavities C1 for primary molding are used to inject molten resin. Then, the injected molten resin is cooled and solidified to a level above which the mold can be opened in the cavity C1. Next, after the strong mold opening (demolding) is performed by the mold clamping cylinder 23, the mold opening and closing mechanism 26 and the moving mechanism 31 operate, thereby fixing the mold 20 and the intermediate mold 30, and the movable mold 22 and the intermediate mold. Open mold between 30. At this time, the primary molded product P1 that has undergone the primary molding is released in a state of being attached to the side of the intermediate mold 30 . Next, the rotary clamping plate 28 and the intermediate molds 30 and 30 are rotated by 180° around the rotation shaft 27 , and the intermediate mold 30 on which the primary molded product P1 is bonded moves to a position facing the fixed mold 20 . In addition, at this time, the intermediate die 30 to which the molded product is not attached is exchanged and faces the movable die 22 .

Furthermore, between the fixed mold 20 and the intermediate mold 30 , and between the movable mold 22 and the intermediate mold 30 , the molds are closed and clamped again. Thus, the cavity C2 between the fixed mold 20 and the intermediate mold 30 is also formed with two spaces C2a, C2b divided by the primary molded product P1. In addition, the above-mentioned spaces C2a and C2b may be formed only between the fixed mold 20 and the primary molded product P1 in addition to being formed between the fixed mold 20, the intermediate mold 30, and the primary molded product P1. In this case, it also corresponds to the cavity C2 between the first mold and the intermediate mold of the present invention. And these spaces C2a, C2b are respectively connected to the nozzle holes 54a, 54b via flow paths, such as a hot runner which fixes the mold 20, and the like. Then, a molten resin different from the primary molded product P1 is injected into the space C2a from the injection device 14 with the nozzle 41 in contact with the nozzle hole 54a. In addition, the molten resin different from the molten resin of the injection device 14 and the primary molded product P1 is injected from the injection device 15 into the space C2b. The injection timings of the injection devices 14, 15, and 17 at this time may be at the same time or different timings (even if the injection timings of the injection devices 15, 17 are different, they are also consistently referred to as secondary molding in this specification, but even if they are called respectively For secondary forming, tertiary forming, it is just a different name.).

Then, the molten resins injected into the cavities C2a and C2b are cooled and solidified, respectively. In the cavities C2a and C2b, if the cooling and solidification of the molten resin is completed and the primary molded product is integrated, the mold clamping mechanism and the mold opening and closing mechanism will operate again, and after demoulding, the metal mold 20 and the intermediate mold are fixed. Mold opening between the metal mold 30 , the movable metal mold 22 and the intermediate metal mold 30 . Then, the three-color composite molded article pasted on any cavity surface of the fixed mold 20 or the intermediate mold 30 can be protruded by the ejector pin provided on the mold, and can be taken out. In addition, at this time, in the cavity C1 of the other movable mold 22 and the intermediate mold 30, the molding of the same primary molded product P1 as before is performed simultaneously.

As above, the cavity C1 between the movable metal mold 22 as the second metal mold and the intermediate metal mold 30 is first formed by the injection device 17, and the molded product P1 is formed using the injection devices 14 and 15 as the first metal mold. An example in which secondary molding is performed in the cavity C2 between the fixed mold 20 and the intermediate mold 30 of the mold is described. However, the present invention can also use the injection devices 14, 15 to perform primary molding in the cavity between the fixed metal mold 20 and the intermediate metal mold 30, and use the injection device 17 to form a cavity between the movable metal mold 22 and the intermediate metal mold 30. The composite molded product is formed by performing secondary molding in the cavity (in this case, even if the injection timings of injections 14 and 15 are different, it is uniformly called primary molding.). Therefore, in the present invention, two or more injection devices are used in both the primary molding and the secondary molding. In addition, in the present invention, it is also conceivable to use four or four machines in the form that one of the primary molding and the secondary molding is three-color, and the other is one-color, or that the primary molding is two-color and the secondary molding is also two-color. Molding of composite molded products with the above injection device. In addition, the present invention is not limited to using different resin materials for all the injection devices, and the same resin material for at least two injection devices may be used.

Next, the second forming method shown in FIG. 5 will be described. In the second molding method, next, using the injection molding machine 11 for molding composite molded products, one injection device 14 disposed on the first clamping plate side and one injection device 14 disposed on the second clamping plate side are used. The injection device 17 is used to form the two-color composite molded product. The above-mentioned second molding method stores steps of sequence control in the control device 53 and can be selected by input from the setting screen 52 . In the second molding method, as shown in FIG. 5 , the fixed die 62 is replaced with a die provided with one nozzle hole 61 corresponding to two-color use. At this time, of course, the intermediate dies 30, 30 and the movable die 22 are also replaced at the same time. Then, the hydraulic cylinder 33 operates, and the support table 34 moves in the horizontal direction B perpendicular to the mold opening and closing direction. And when the support base 34 abuts against the stopper 32a, the operation|movement of the hydraulic cylinder 33 stops. As a result, the nozzle 41 of one injection device 14 faces the nozzle hole 61 (in addition, when using the other injection device 15, the hydraulic cylinder 33 is also driven so that the support table 34 is aligned with the stopper 32b on the opposite side. abut so that the nozzle 46 of the injection device 15 faces the nozzle hole 61.). In addition, in order to stop the support table 34 at the intermediate position, a movable stopper (not shown) may be provided so as to abut against the above-mentioned stopper.

Then, the hydraulic cylinder 38 of the nozzle touching mechanism is driven to move the injection device 14 forward, and the nozzle 41 is brought into nozzle touching with the nozzle hole 61 of the fixed mold 62 . At this time, the injection device 15 is fixedly held at the retracted position. The operation of the injection molding machine 11 when molding the two-color composite molded product using the two injection devices 14, 17 is the same as the injection molding of the three-color composite molded product using the three injection devices 14, 15, 17. The operation procedure of the molding machine 11 is substantially the same, except that injection by the injection device 15 is not performed. That is, after molding the primary molded product P1 on the injection device 17 side of the second injection unit, the primary molded product P1 attached to the intermediate mold 30 is rotated and moved to the fixed mold 20 side, and the mold closing and mold clamping are performed again, Secondary molding is performed using the injection device 14 to form a two-color composite molded product. In addition, it is also possible to perform primary molding on the side of the fixed metal mold 20 in this reverse order, and perform secondary molding on the side of the movable metal mold to form a composite molded product. The molding of the three-color composite molding is the same.

In addition, in this embodiment, the capabilities of the injection devices of the plurality of injection devices 14 and 15 are different. Therefore, even when performing two-color molding, it is possible to select and use an optimal injection device for one molding. Specifically, when the injection volume of either primary molding or secondary molding performed through the cavity between the fixed metal mold 20 and the intermediate mold 30 as the first metal mold is large, the screw is used. An injection device with a larger diameter (or injection rate, theoretical injection volume). In addition, when the injection amount of molding in the above-mentioned cavity is small, an injection device having a smaller screw diameter (or injection rate, theoretical injection volume) is used. As described above, the injection devices 13 and 14 can be selected according to the injection, and the metering time can be shortened when the injection volume is large. In addition, when the injection amount is small, the injection device 15 having a small screw diameter can be used to reduce the injection amount relative to the advance distance of the screw, thereby enabling high-precision molding. In addition, it is also possible to use an optimal injection device from the point of view of the retention of the resin in the heating cylinder. In addition, depending on the material of the resin, it is also possible to prepare a dedicated injection device and selectively use it, or to prepare a high-speed high-pressure injection type injection device corresponding to thin object molding and the like and to selectively use it.

In addition, as a modified example of the first molding method and the second molding method, the injection devices 14 and 15 of the first injection device moving unit 16 may be moved in directions other than the screw axis during molding. That is, in the molding method using the injection devices 14 and 15, the injection devices 14 and 15 may be configured to correspond to the case where there is only one nozzle hole 54a, and the position of the nozzle holes 54a and 54b does not face the nozzles 41 and 46. Move, inject. In addition, in the case of using the injection devices 14 and 15 and the molding method using only one of the injection devices 14 and 15, it is also possible to use the The injection devices 14, 15 move and inject.

Next, the third forming method shown in FIG. 6 will be described. In the third molding method, using the injection molding machine 11 for molding composite molded products, a plurality of the above-mentioned injection devices 14, 15 are used to form the composite mold on the first metal mold without rotating the above-mentioned intermediate mold 30. The molten material is injected into the cavity between the fixed metal mold 20 and the intermediate metal mold 30 to form a multi-color composite molded product. The above-mentioned third molding method can be selected by an input from the setting screen 52 by storing the sequence control steps in the control device 53 .

First, before forming, a wedge block 71 without a cavity is installed between the movable clamping plate 21 and the rotating clamping plate 28 as the second clamping plate. Thereby, the movable clamping plate 21 and the rotary clamping plate 28 can be moved like a single clamping plate by the mold opening and closing mechanism 26 . Therefore, the rotary clamping plate 28 cannot be rotated. The mold attached to the fixed clamping plate 19 and the rotating clamping plate 28 is a metal mold capable of performing multi-color molding by moving the core 72 through a driving mechanism such as a hydraulic cylinder 73 . And, when the mold is closed and clamped between the fixed mold 74 and the movable mold 75, the injection device 14, 15 arranged on the side of the fixed clamp 19 as the first clamp is used to form the mold on the fixed mold 74. The cavity C3 between the movable metal mold 75 performs molding of a composite molded product.

At this time, after injecting into the cavity C3 from any one of the injection devices 14 and cooling and solidifying to form a primary molded product, the hydraulic cylinder 73 of the movable mold 75 is operated to retract the core 72 . Then, by retracting the core 72, injection is performed from any other injection device 15 into the newly formed cavity to carry out secondary molding, and it is cooled and solidified in a form combined with the primary molded product to form a composite molded product. Then, a mold is opened between the fixed mold 74 and the movable mold 75, and the composite molded product pasted on any mold is protruded by an ejector pin.

In addition, as mentioned above, it is also possible not to install the wedge block 71 between the movable clamping plate 21 and the rotary clamping plate 28, but to install a forming metal mold, and between the movable clamping plate 21 and the rotating clamping plate 28 Other molding is also performed. In this case, when the above-mentioned composite molded product is formed between the fixed clamping plate 18 and the rotating clamping plate 28 as the first clamping plate, the injector 17 is attached to the movable clamping plate as the second clamping plate in parallel. The movable clamping plate 21 and the cavity of the molding die of the rotary clamping plate 28 are injected to form other molded products substantially simultaneously. Furthermore, after mold opening between the fixed clamping plate 18 and the rotating clamping plate 28, and between the movable clamping plate 21 and the rotating clamping plate 28, the rotary clamping plate 28 is not rotated, but each molded product is protruded by the thimble, thereby its taken out. According to this, productivity can be improved.

Next, an injection molding machine 81 for molding a composite molded product according to another embodiment shown in FIG. 7 will be described focusing on the differences. In the injection molding machine 81 for molding composite molded products, the structures of the mold clamping device 13 and the second injection unit on the second clamping plate side are the same as those in the embodiment shown in FIG. In another embodiment shown in FIG. 7 , a plurality of injection devices 82 and 83 on the side of the fixed clamping plate 19 serving as the first clamping plate are mounted on different support platforms 84 on the upper surface of the table portion 12 a of the pedestal 12 . , 85, which can move in directions other than the screw shaft, respectively. Specifically, as shown in FIG. 7 , guide rails 86 and 86 are provided in the horizontal direction B perpendicular to the mold opening and closing direction, and the support table 84 is slidable with respect to the guide rails 86 and 86 by a hydraulic cylinder 87 as a driving mechanism. Furthermore, a base 88 is provided on the support table 84 so as to be movable in the mold opening and closing direction A (screw axial direction) via the hydraulic cylinder 89 of the nozzle touching mechanism. Furthermore, the injection device 82 is placed on the base 88 . In addition, the injection device 83 is also placed on the support table 85 that can slide freely on other guide rails 90, 90 provided in the above-mentioned direction B via the base 91, and can be moved in the above-mentioned direction B by a hydraulic cylinder 92 as another driving mechanism. The hydraulic cylinder 93 of the nozzle touch mechanism moves to the mold opening and closing direction A.

The injection molding machine 81 for molding a composite molded product can move either one of the injection devices 82 and 83 suitable for molding to a position where it can come into contact with the nozzle hole 95 of the fixed mold 94 when performing two-color molding. In addition, in the case of performing three-color molding, both the injection devices 82 and 83 can be moved to positions where they can come into contact with the two nozzle holes 95 of the fixed mold 92 , respectively. In addition, in the embodiment of FIG. 7 , even when the interval between the two nozzle holes 95 of the fixed die 94 differs depending on the die, the intervals between the nozzles 96 and 97 can be changed accordingly.

In addition, as a modified example of FIG. 7 , although not shown, the two injection devices are placed on a common support platform. In addition, only one injection device may be placed on the above-mentioned support platform independently of the other injection device. Placed on another support table that moves in a direction perpendicular to the mold opening and closing direction. Even in this example, the intervals between the nozzles of the plurality of injection devices can be changed. In addition, in the example of FIG. 7 and this modified example, it is also possible to prevent one of the centers of the plurality of injection devices from moving in the direction B other than the screw axis, and at least one other injection device can move in the direction B other than the screw axis. Move in direction B. In this case, the injection device at the center is used for two-color molding, and it moves only in the direction of opening and closing the mold for nozzle touch. In addition, in the case of three-color molding, use both the above-mentioned central injection device and other injection devices that move in directions other than the screw axis, such as the horizontal direction B perpendicular to the mold opening and closing direction, toward the optimum position for nozzle contact. .

Although the present invention is not listed one by one, it is not limited to the above-mentioned embodiment, and those skilled in the art can of course make changes based on the gist of the present invention and apply them. Injection molding is not limited to materials, and includes molding such as injection compression molding, foam molding, sandwich molding, and insert molding.

Claims (5)

1. An injection molding machine for forming a composite molded product, which is between a first clamping plate for mounting a first metal mold and a second clamping plate for mounting a second metal mold so as to be able to align with the above-mentioned first metal mold And the second metal mold clamping mode is provided with an intermediate metal mold that rotates around an axis in a direction perpendicular to the mold opening and closing direction, and at least three injection devices are provided, The above-mentioned injection molding machine for molding composite molded products is characterized by comprising: a plurality of injection devices capable of injecting molten material into a cavity formed between the first metal mold and the intermediate metal mold; and an injection device capable of injecting a molten material into a cavity formed between the above-mentioned second metal mold and the intermediate metal mold, At least one injection device among the plurality of injection devices is configured to be movable in a direction other than the screw axis. 2. The injection molding machine for molding composite molded articles according to claim 1, wherein: The plurality of injection devices described above are placed on the same support table, and can simultaneously move in directions other than the screw axis. 3. The injection molding machine for molding composite molded products according to claim 1, wherein: The plurality of injection devices described above are placed on different support tables, and at least one injection device can move in directions other than the screw axis. 4. An injection molding machine for composite molded products, which is between a first clamping plate for mounting a first metal mold and a second clamping plate for mounting a second metal mold so as to be able to cooperate with the above-mentioned first metal mold and The second mold clamping method is provided with an intermediate mold that rotates around an axis perpendicular to the mold opening and closing direction, and at least three injection devices are provided, The above-mentioned injection molding machine for composite molded products is characterized in that it includes: a plurality of injection devices capable of injecting molten material into a cavity formed between the first metal mold and the intermediate metal mold; and an injection device capable of injecting a molten material into a cavity formed between the above-mentioned second metal mold and the intermediate metal mold, Optionally: molding of a composite molded product using an injection device capable of injecting a molten material into a cavity formed between a plurality of the plurality of injection devices, the second metal mold, and the intermediate metal mold; and Molding of a composite molded product using an injection device capable of injecting a molten material into a cavity formed between one of the plurality of injection devices, the second mold, and the intermediate mold. 5. An injection molding machine for forming a composite molded product, which is between a first clamping plate for mounting a first metal mold and a second clamping plate for mounting a second metal mold so as to be able to align with the above-mentioned first metal mold. And the second metal mold clamping mode is provided with an intermediate metal mold that rotates around an axis in a direction perpendicular to the mold opening and closing direction, and at least three injection devices are provided, The above-mentioned injection molding machine for molding composite molded products is characterized by comprising: a plurality of injection devices capable of injecting molten material into a cavity formed between the first metal mold and the intermediate metal mold; and an injection device capable of injecting a molten material into a cavity formed between the above-mentioned second metal mold and the intermediate metal mold, Molding of a composite molded product in which a molten material is injected into a cavity formed between the first mold and the intermediate mold using a plurality of the plurality of injection devices without rotating the intermediate mold can be selected.