JP6161214B2 - Injection molding machine for composite molding - Google Patents

Description

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

An intermediate mold rotated about an axis in a direction perpendicular to the mold opening / closing direction is provided between the first board to which the first mold is attached and the second board to which the second mold is attached. As an injection molding machine for molding a composite molded product provided so as to be able to be matched with the first mold and the second mold, those described in Patent Documents 1 to 3 are known. In Patent Document 1, injection devices are provided on the outside of a fixed plate which is one of a first plate and a second plate and on the outside of a movable plate which is the other. Then, the primary molded product formed between the first mold and the intermediate mold is closed with the second mold by rotating the intermediate mold, and 2 between the second mold and the intermediate mold. Next molding is performed to form a composite molded product. (Alternatively, the primary molded product may be molded first between the second mold and the intermediate mold.)

However, this injection molding machine for molding a composite molded product can only be used to mold a composite molded product of two kinds of resin materials, and cannot cope with a wide variety of variations. On the other hand, as an injection molding machine for molding a composite molded product capable of molding a composite molded product of three types of resin materials, the one described in Patent Document 2 is known. In the example of FIG. 1 of Patent Document 2, a total of three injection devices are provided, one on the outer side of the fixed platen, one on the outer side of the movable platen, and one above the movable die and the intermediate die. In the example of FIG. 3, a total of three injection devices are provided, one on the outer side of the fixed platen, one on the outer side of the movable platen, and one above the movable die and the intermediate die. Furthermore, in the example of FIG. 4, a total of three injection devices are provided, two outside the fixed platen and one outside the movable platen.

Patent Document 3 performs two-color molding in the same manner as Patent Document 1, but is formed on both sides without rotating the rotating disk as described in the fifth molding example and the sixth molding example. It is described that a single-color molded product can also be molded by the first cavity and the second cavity.

JP 2011-178095 A (Claim 1, 0030, FIG. 1) JP 2013-132812 A (Claim 1, FIG. 1, FIG. 3, FIG. 4) Japanese Unexamined Patent Publication No. 2011-56774 (Claims 1, 0055, 0057, FIGS. 7 and 8)

However, Patent Document 2 assumes that all of the injection devices are used to form a composite molded product, and the structure does not assume various molding methods. Further, Patent Document 3 does not describe any variation of an injection molding machine for molding a composite molded product provided with at least three injection devices, which are supposed to perform molding of a single color molded product.

In the present invention, in view of the above problems, an axis in a direction perpendicular to the mold opening / closing direction is provided between the first panel on which the first mold is mounted and the second panel on which the second mold is mounted. In an injection molding machine for molding a composite molded article, wherein an intermediate mold rotated around a center is provided so as to be mold-matchable with the first mold and the second mold, and at least three injection devices are provided. It is an object of the present invention to provide an injection molding machine for molding a composite molded product that can ensure variations in molding.

Injection molding machine for a composite molded article formed according to claim 1 of the present invention, between the movable platen to the fixed platen and the movable mold to the stationary mold is mounted is mounted, in the direction perpendicular to the mold opening and closing direction In an injection molding machine for molding a composite molded article, wherein an intermediate mold rotated about an axis is provided so as to be able to be matched with the fixed mold and the movable mold, and is provided with at least three injection devices . A plurality of injection devices having different capacities capable of injecting molten material into a cavity formed between the fixed mold and the intermediate mold , disposed on the opposite side of the fixed mold mounting surface, and a movable mold of the movable platen An injection device that is disposed on the opposite side of the mounting surface and is moved together with the movable platen by driving the mold opening / closing mechanism and is capable of injecting a molten material into a cavity formed between the movable mold and the intermediate mold, Multiple injection devices with different capabilities Characterized in that it is movably arranged in the direction other than the axis.

Injection molding machine for a composite molded article formed according to claim 2 of the present invention, between the movable platen to the fixed platen and the movable mold to the stationary mold is mounted is mounted, in the direction perpendicular to the mold opening and closing direction In an injection molding machine for a composite molded product, wherein an intermediate mold rotated around an axis is provided so as to be able to be matched with the fixed mold and the movable mold, and the fixed mold for the fixed platen is provided. A plurality of injection devices having different capacities capable of injecting a molten material into a cavity formed between the fixed mold and the intermediate mold disposed on the opposite side of the mold mounting surface, and mounting of the movable mold of the movable platen An injection device that is disposed on the opposite side of the surface and is moved together with the movable platen by driving of a mold opening / closing mechanism and is capable of injecting a molten material into a cavity formed between the movable mold and the intermediate mold, and is fixed Cavite formed between mold and intermediate mold A jettable injection unit molten material and the injection device of the plurality groups into a cavity formed between the movable mold and the intermediate mold of the injection device of the different groups of possible output capacity of the molten material Molding of the used composite molded product, one injection device out of a plurality of injection devices having different capacities capable of injecting molten material into a cavity formed between the fixed mold and the intermediate mold, and the movable wherein the forming of the mold and the composite molded article using the possible injection injection unit molten material into the cavity formed between the intermediate mold can be selected

Injection molding machine for a composite molded article formed of claim 3 of the present invention, between the movable platen to the fixed platen and the movable mold to the stationary mold is mounted is mounted, in the direction perpendicular to the mold opening and closing direction In an injection molding machine for molding a composite molded article, wherein an intermediate mold rotated about an axis is provided so as to be able to be matched with the fixed mold and the movable mold, and is provided with at least three injection devices . A plurality of injection devices having different capacities capable of injecting molten material into a cavity formed between the fixed mold and the intermediate mold , disposed on the opposite side of the fixed mold mounting surface, and a movable mold of the movable platen An injection device that is disposed on the opposite side of the mounting surface and is moved together with the movable platen by driving the mold opening / closing mechanism and is capable of injecting a molten material into a cavity formed between the movable mold and the intermediate mold, Among a plurality of injection devices having different capacities And forming the composite molded by injecting a molten material into the cavity formed between the stationary mold and the intermediate mold without rotating the intermediate mold with several groups, injection of different groups of the ability A composite molded product obtained by rotating an intermediate mold using one or a plurality of injection apparatuses and an injection apparatus capable of injecting a molten material into a cavity formed between the movable mold and the intermediate mold It is characterized in that it can be selected.

Injection molding machine for a composite molded article molded of the present invention, between the movable platen to the fixed platen and the movable mold to the stationary mold is mounted is attached, it is rotated about the axis perpendicular to the mold opening and closing direction In an injection molding machine for molding a composite molded product, in which an intermediate mold is provided so as to be matable with the fixed mold and the movable mold, the mounting surface of the fixed mold of the fixed platen A plurality of injection devices having different capacities capable of injecting molten material into a cavity formed between the fixed mold and the intermediate mold, and the opposite side of the movable mold mounting surface of the movable platen And an injection device capable of injecting molten material into a cavity formed between the movable mold and the intermediate mold by being moved together with the movable plate by driving the mold opening / closing mechanism. In the direction other than the screw shaft Because it is rotatably arranged, it is possible to ensure a variation of the molding.

FIG. 2 is a plan view of an injection molding machine for molding a composite molded product according to an embodiment of the present invention, and shows a state when the mold is opened and when the injection device is retracted. It is the top view which represented a part of injection molding machine for compound molded product shaping | molding of embodiment of this invention by the cross section, and is a figure which shows the time of mold closing and the time of injection apparatus advance. It is a top view of a plurality of injection devices of an embodiment of the present invention. It is a side view of a plurality of injection devices of an embodiment of the present invention. It is a figure which shows the 2nd shaping | molding method of the injection molding machine for composite molded product shaping | molding of embodiment of this invention. It is a figure which shows the 3rd shaping | molding method of the injection molding machine for composite molded product shaping | molding of embodiment of this invention. It is a figure which shows the top view of the multiple injection apparatus of the injection molding machine for compound molded product shaping | molding of another embodiment, and its molding method.

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. An 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 a molten resin injected from another injection device. 13 and a first injection device moving unit 16 including a plurality of injection devices 14 and 15 and a second injection device moving unit 18 including one injection device 17 are provided.

In the mold clamping device 13, a fixed mold 20 as a first mold is attached to a fixed plate 19 as a first plate fixed to the bed 12, and a second plate is attached to a movable plate 21 as a second board. A movable mold 22 which is a mold is attached. In the vicinity of the four corners of the stationary platen 19, mold clamping cylinders 23 that are mold clamping mechanisms are provided, and the rods are also inserted as tie bars 24 in the vicinity of the four corners of the movable platen 21. On the outside of the fixed platen 19 (on the opposite side of the mounting surface of the fixed mold 20), the recess 19a (conical portion) into which the heating cylinders 42 and 59 and the nozzles 41 and 46 of the two injection devices 14 and 15 can be inserted. Is formed. A locking portion (not shown) is provided on the outer periphery of the tie bar 24, and a half nut 25 is provided in the vicinity of a portion of the outer wall surface of the movable platen 21 through which the tie bar 24 is inserted. Further, on the outside of the movable platen 21 (opposite side of the mounting surface of the movable mold 22), a recess 21a (a mortar portion) into which the heating cylinder 60 and the nozzle 55 of one injection device 17 can be inserted is formed. . The movable platen 21 can be moved in the mold opening / closing direction A on the bed 12 by a mold opening / closing mechanism 26 (movable plate moving mechanism). The mold opening / closing mechanism 26 is attached to the bed 12 and the movable platen 21 and includes a servo motor as a driving means and a ball screw mechanism.

Further, between the fixed platen 19 and the movable platen 21, there is a rotating shaft 27 in a direction orthogonal to the mold opening / closing direction (the rotating shaft 27 is a vertical axis in most cases, but may be a horizontal axis). A rotating disk 28 is provided that is rotated around the center. In this embodiment, the turntable 28 is rotatable together with the rotary shaft 27 via a bearing (not shown) with respect to an intermediate plate 29 guided by the bed 12 or the tie bar 24 and movable in the mold opening / closing direction A (or reversed by 180 °). It is provided freely. An electric motor 35 for rotating the rotating disk 28 is attached to the intermediate disk 29. An intermediate mold 30 having the same cavity surface is attached to one surface and the other surface of the turntable 28. The rotating plate 28 can be moved in the mold opening / closing direction A by a moving mechanism 31 using a servo motor and a ball screw mechanism with respect to the fixed platen 19 or the movable platen 21. The rotating plate 28 is rotated to the intermediate plate 29 on the table through which the tie bar 24 is not inserted, other than the one provided rotatably on the intermediate plate 29 inserted into the tie bar 24 (including one divided vertically). It may be provided. Further, the intermediate mold 30 may be attached to the intermediate plate 29 so as to be directly rotatable, and the rotary plate 28 may not be provided.

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 21 side which is the second plate. Further, a toggle mechanism may be provided on the back surface of the movable platen 21, and in this case, the mold clamping mechanism and the mold opening / closing mechanism are used together. 1 and 2, each of the mold opening / closing mechanism 26 of the movable platen 21 and the moving mechanism 31 of the intermediate plate 29 is shown in FIG. 1 and FIG. 2, but generally has two or more units, the number of which is attached, The driving means is not limited. Further, in the 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 attached to both sides thereof. The first board and the second board to which the second mold is attached may be provided so as to be movable toward the middle intermediate board. In addition, a first movable plate that is a first plate is provided on one side of the fixed plate, and a second movable plate that is a second plate is provided on one side of the first movable plate. An intermediate board and a rotary board that are movable in the mold opening / closing direction A may be provided between the movable board and the second movable board. Further, a plurality of rotating disks (or a plurality of sets of intermediate molds) may be provided between the first board and the second board.

Next, the first injection device moving unit 16 disposed on the fixed platen 19 side, which is the first plate, on which a plurality of injection devices 14 and 15 are placed will be described with reference to FIGS. Each of the injection devices 14 and 15 of the first injection device moving unit 16 is an injection capable of injecting a molten material into a cavity C2 formed between a fixed mold 20 and an intermediate mold 30 which are first molds. Device. A plurality of guide rails 32, 32 are provided on the platform 12 a on the bed 12 in a horizontal direction B (operation side-opposite operation direction) orthogonal to the mold opening / closing direction. A support base 34 of the first injection device moving unit 16 is slidably provided in the direction B. Note that stoppers 32a and 32b are provided at both ends of the guide rails 32 and 32, respectively. In addition, a hydraulic cylinder 33 is provided on the base 12 a of the bed 12 as a driving means for moving the support base 34. In the hydraulic cylinder 33, a cylinder portion 33a is attached to a bracket 56 provided between the guide rails 32, 32 on the base portion 12a, and a rod 33b is attached to a bracket 57 on the back surface of the support base 34. The driving means for moving the support base 34 may be other means such as a servo motor and a ball screw mechanism or an air cylinder.

Two injection devices 14 and 15 are placed on the support base 34. Although the injection device 14 and the injection device 15 of the present embodiment are different injection devices, the mounting structure and the nozzle touch 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 operation side of the upper surface of the support base 34 in the mold opening / closing direction, and the base 37 of the injection device 14 is placed in the mold opening / closing direction A on the guide rails 36, 36. It is slidably provided. Further, the support base 34 is provided with a base 37 and a hydraulic cylinder 38 of a nozzle touch mechanism for moving the injection device 14. In the hydraulic cylinder 38, a cylinder portion 38 a is attached to a bracket 39 provided between the guide rails 36 on the support base 34, and a rod 38 b is attached to a bracket 40 on the back surface of the base 37. The driving means of the nozzle touch mechanism may be other means such as one using a servo motor and a ball screw mechanism or an air cylinder.

The injection device 14 includes a heating cylinder 42 in which a nozzle 41 is provided at a front portion and a screw (not shown) is incorporated in an inner hole, a driving unit 43 that drives the screw to rotate and drive forward and backward, and a resin material in the heating cylinder 42. A material supply unit 44 including a supply housing unit is provided. Therefore, the axial direction of the nozzle 41 and the heating cylinder 42 and the direction of the screw shaft coincide. In this embodiment, the injection mechanism and the metering mechanism of the injection device 14 are driven by an electric motor such as a servo motor, but may be hydraulically operated, and the types thereof are not limited. The other injection device 15 is smaller than the injection device 14, but includes a hydraulic cylinder 45 of a nozzle touch mechanism and has the same structure as the injection device 14 that can move forward and backward on the guide rails 58 and 58. The nozzle 46 of the injection device 15 can move forward together with the nozzle 42 of the injection device 14 until it abuts on the nozzle touch surface 54 of the fixed mold 20. The type of the injection device 15 and the type of the nozzle touch mechanism are not limited.

Since the first injection device moving unit 16 has the above-described structure, each of the injection devices 14 and 15 is not only movable in the mold opening / closing direction A, but also in the horizontal direction B (screw) perpendicular to the mold opening / closing direction. It can also be moved in directions other than the axis. The reason why the injection devices 14 and 15 of the present invention take such a structure is that the main purpose is to change the injection devices 14 and 15 that come into contact with the nozzle holes 61 of the fixed mold 62 as will be described later. The injection devices 14 and 15 need only be movable in directions other than the screw shaft. Specifically, it may be one in which the injection devices 14 and 15 move along an arcuate guide rail, or one that moves obliquely rearward.

The arrangement of the plurality of injection devices 14 and 15 is not limited to the example of being arranged outside the first board (opposite to the mounting surface of the fixed mold) as shown in FIG. Alternatively, it may be provided on a bed or a floor on the side of a mold attached to the first board or the first board. (In that case, the moving direction of the injection device 14 other than the screw shaft may coincide with the mold opening / closing direction A, or may not coincide with the horizontal direction B perpendicular to the mold opening / closing direction.) At least two injection devices are provided, and three or more injection devices may be provided.

Next, the second injection device moving unit 18 that is disposed on the movable platen 21 side as the second plate and includes the injection device 17 will be described with reference to FIGS. 1 and 2. The injection device 17 placed on the second injection device moving unit 18 is an injection capable of injecting a molten material into a cavity C1 formed between a movable die 22 as a second die and an intermediate die 30. Device. A plurality of guide rails 47, 47 are provided on the bed 12 in the mold opening / closing direction, and a support base 48 is slidably provided in the mold opening / closing direction A on the guide rails 47, 47. The front end of the support base 48 is integrally fixed to the movable platen 21 or connected to the movable platen 21. Therefore, the second injection device moving unit 18 is moved together with the movable platen 21 by driving the mold opening / closing mechanism 26. Further, another guide rail 49, 49 is provided on the support base 48, and a base 50 on which the injection device 17 is directly placed is movably provided on the guide rail 49, 49. A cylinder portion of a hydraulic cylinder 51 that is a nozzle touch mechanism is attached to the support base 48, and a rod of the hydraulic cylinder 51 is attached to the base 50. The injection device 17 is slidable in the mold opening / closing direction A together with the base 50 by the operation of the hydraulic cylinder 51. The type of nozzle touch mechanism is not limited.

The structure of the injection device 17 is the same as that of the injection devices 14 and 15. The heating cylinder 60 in which the screw is built in the inner hole, the nozzle 55 provided in the front part of the heating cylinder 60, the drive unit, the supply unit, etc. Is provided. Further, the injection device 17 may be provided on the upper part of the movable platen 21, and in the horizontal direction in which the nozzle is orthogonal to the mold opening / closing at a lateral position of the movable platen 21, the movable mold 22, the intermediate mold 30, or the like. It may be provided toward B. The second injection device moving unit 18 includes at least one injection device, and may include a plurality of injection devices. In the present invention, a plurality of injection devices of the first injection device moving unit may be provided by connecting the movable platen 21 side as the first plate to the movable platen 21. In this case, the fixed platen 19 becomes the second platen, and the second injection device moving unit 18 includes at least one injection device 17.

The capabilities of these injection devices 14, 15, and 17 are not limited and may be the same or different, but the following various cases are also assumed. The injection device 14 and the injection device 17 have the same screw diameter (screw flight diameter), and the injection device 15 has a smaller screw diameter. The injection device 14 has the largest screw diameter, and the screw diameter decreases in the order of the injection device 17 and the injection device 15. The injection device 14 has the largest screw diameter, and the screw diameter becomes smaller in the order of the injection device 15 and the injection device 17. The injection device 17 has the largest screw diameter, and the screw diameter becomes smaller in the order of the injection device 14 and the injection device 15. The injection device 17 has the largest screw diameter, the injection device 14 and the injection device 15 have the same screw diameter, and the screw diameter is smaller than that of the injection device 17.

The injection molding machine 11 for molding a composite molded product includes a setting screen 52 and a control device 53. The control device 53 includes a sequence control operation procedure for three-color molding using two of the plurality of injection devices 14 and 15 and the injection device 17 as described later, and a plurality of injection devices 14 and 15. Both the operation procedure of sequence control in the case of performing two-color molding using any one of these and the injection device 17 can be stored in the storage device 53 as necessary. Further, the control device 53 performs an operation procedure of sequence control when performing multicolor molding using only the plurality of injection devices 14 and 15 on the first board side without rotating the intermediate molds 30 and 30. It can be stored 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, three colors using all of 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 are used. The molding of the composite molded product will be described. As shown in FIGS. 1 and 2, the support base 34 of the first injection device moving unit 16 is in an intermediate position, and the nozzle 41 of the injection device 14 and the nozzle 46 of the injection device 15 are each a nozzle touch of the fixed mold 20. It is in a position facing the two nozzle holes 54a, 54b of the surface 54. 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 forward, the nozzle 41 is connected to the nozzle hole 54a, and the nozzle 46 is connected to the nozzle hole 54b. ing. The measurement of the molten resin before injection by the injection devices 14 and 15 is often performed with the nozzles 41 and 46 in contact with each other as shown in FIG. 2, but the nozzles 41 and 46 are provided with valves. For example, the injection devices 14 and 15 may be moved backward. On the other hand, the injection device 17 of the second injection device moving unit 18 is similarly weighed in a state where the nozzle 55 is connected to the nozzle hole of the movable mold 22, but the measurement may be performed by moving backward.

On the other hand, on the side of the mold clamping device 13, the mold opening / closing mechanism 26 and the moving mechanism 31 are operated, and the fixed mold 20 and the intermediate mold 30 and the movable mold 22 and the intermediate mold 30 are closed. Then, the half nut 25 is locked and the mold clamping cylinder 23 is operated to perform mold clamping between the respective molds. By the mold closing and mold clamping, a primary molding cavity C1 is formed between the movable mold 22 and the intermediate mold 30 as shown in FIG. Further, a cavity C2 for secondary molding is formed between the fixed mold 20 and the intermediate mold 30.

Explaining along the molding process of one composite molded product, the movable mold 22 and the intermediate mold are then passed from the nozzle 55 of the injection device 17 on the movable platen 21 side through the nozzle hole and the flow path such as a hot runner. The molten resin is injected into the cavity C1 for primary molding between 30. The injected molten resin is cooled and solidified to such an extent that the mold can be opened in the cavity C1. Next, after the mold is opened (released) by the clamping cylinder 23, the mold opening / closing mechanism 26 and the moving mechanism 31 are operated, and the fixed mold 20 and the intermediate mold 30, the movable mold 22 and the intermediate mold 30 are operated. The mold is opened. At this time, the primary molded product P1 subjected to the primary molding is released in a form attached to the intermediate mold 30 side. Next, the turntable 28 and the intermediate molds 30, 30 are rotated by 180 ° about the rotation shaft 27, and the intermediate mold 30 with the primary molded product P 1 attached is moved to a position facing the fixed mold 20. . Further, at this time, the intermediate mold 30 to which no molded product is attached at the same time is switched to face the movable mold 22.

Then, the fixed mold 20 and the intermediate mold 30 and the movable mold 22 and the intermediate mold 30 are closed and clamped again. Thus, in the cavity C2 between the fixed mold 20 and the intermediate mold 30, two divided spaces C2a and C2b are formed using the primary molded product P1. The spaces C2a and C2b are formed only between the fixed mold 20 and the primary molded product P1, in addition to those formed between the fixed mold 20, the intermediate mold 30, and the primary molded product P1. In any case, it corresponds to the cavity C2 between the first mold and the intermediate mold of the present invention. These spaces C2a and C2b are connected to the nozzle holes 54a and 54b through flow paths such as a hot runner of the fixed mold 20, respectively. Then, a molten resin different from the primary molded product P1 is injected into the space C2a from the injection device 14 in which the nozzle 41 is in contact with the nozzle hole 54a. The space C2b is injected from the injection device 15 with a molten resin from the injection device 14 and a molten resin different from the primary molded product P1. The injection timings of the injection devices 14, 15, and 17 at these times may be simultaneous or separate. (Even if the injection timings of the injection devices 15 and 17 are different, they are collectively referred to as secondary molding in this specification. However, even if they are referred to as secondary molding and tertiary molding, there is no problem because they are merely different names. .)

The molten resin injected into the cavities C2a and C2b is cooled and solidified. When cooling and solidification of the molten resin is completed in the cavities C2a and C2b and integrated with the primary molded product, the mold clamping mechanism and the mold opening / closing mechanism are operated again to release the mold, and then the fixed mold 20 And the middle mold 30 and the mold between the movable mold 22 and the middle mold 30 are opened. The three-color composite molded product adhered to the cavity surface of either the fixed mold 20 or the intermediate mold 30 is ejected by an ejector provided in the mold, and is taken out. At the same time, in the cavity C1 of the other movable mold 22 and the intermediate mold 30, the same primary molded product P1 is molded as described above.

In the above, the primary molded product P1 is first molded in the cavity C1 between the movable mold 22 which is the second mold and the intermediate mold 30 using the injection apparatus 17, and the injection apparatuses 14 and 15 are used. An example in which secondary molding is performed in the cavity C2 between the fixed mold 20 and the intermediate mold 30 as the first mold is described. However, in the present invention, primary molding is first performed in the cavity between the fixed mold 20 and the intermediate mold 30 using the injection apparatuses 14 and 15, and the movable mold 22 and the intermediate mold 30 are used using the injection apparatus 17. A composite molded product may be formed by performing secondary molding in the cavity between the two. (In this case, even if the injection timings of the injections 14 and 15 are different, they are collectively referred to as primary molding.) Therefore, in the present invention, two or more injection devices are used in either primary molding or secondary molding. Is done. In the present invention, four or four or more injection devices are used such that one of the primary molding and secondary molding is three colors and the other is one color, or the primary molding is two colors and the secondary molding is two colors. Molding of the composite molded product used is also envisaged. Further, in the present invention, each injection device does not use different resin materials, but may use the same resin material.

Next, the second molding method shown in FIG. 5 will be described. In the second molding method, next, an injection molding machine 11 for molding a composite molded product is used, and one injection device 14 disposed on the first panel side and the second panel side are arranged. A two-color composite molded product is molded using a single injection device 17 provided. In the second molding method, a sequence control procedure is stored in the control device 53 and can be selected by an input from the setting screen 52. In the second molding method, as shown in FIG. 5, the fixed mold 62 is replaced with a mold having one nozzle hole 61 corresponding to two colors. At this time, it is natural that the intermediate molds 30 and 30 and the movable mold 22 are also replaced at the same time. Then, the hydraulic cylinder 33 is operated, and the support base 34 is moved in the horizontal direction B perpendicular to the mold opening / closing direction. When the support base 34 comes into contact with the stopper 32a, the operation of the hydraulic cylinder 33 is stopped. As a result, the nozzle 41 of one injection device 14 faces the nozzle hole 61. (Also, when the other injection device 15 is used, the nozzle 46 of the injection device 15 faces the nozzle hole 61 by driving the hydraulic cylinder 33 to bring the support base 34 into contact with the stopper 32b on the opposite side. In addition, a movable stopper (not shown) may be provided in order to stop the support base 34 at the intermediate position, and may be brought into contact with the stopper.

Then, the hydraulic cylinder 38 of the nozzle touch mechanism is driven to move the injection device 14 forward, so that the nozzle 41 touches 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 at the time of molding a two-color composite molded article using the two injection devices 14 and 17 performed thereafter is performed using the previous three injection devices 14, 15 and 17. The operation procedure of the injection molding machine 11 at the time of molding the three-color composite molded product is substantially the same, and only the point that the injection by the injection device 15 is not performed is different. That is, after the primary molded product P1 is first molded 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. Then, the mold is closed and clamped again, and secondary molding is performed using the injection device 14 to form a two-color composite molded product. In addition, the three injection devices 14, 15, and the like may be formed in the reverse order to form a composite molded product by performing primary molding on the fixed mold 20 side and secondary molding on the movable mold side. This is the same as the molding of a three-color composite molded article using No. 17.

In the present embodiment, the plurality of injection devices 14 and 15 have different injection device capabilities. Therefore, in the case of two-color molding, it is possible to select and use an injection device optimal for one molding. Specifically, when the injection quantity of either primary molding or secondary molding performed in the cavity between the fixed mold 20 and the intermediate mold 30 as the first mold is large, the screw diameter ( Alternatively, use the injection device with the larger injection rate or theoretical injection volume. In addition, when the injection amount of molding in the cavity is small, an injection device having a smaller screw diameter (or injection rate or theoretical injection volume) is used. In this way, by making the injection devices 13 and 14 selectable according to the purpose of injection, the measurement time can be shortened when the injection amount is large. Further, when the injection amount is small, the injection device 15 having a small screw diameter is used, so that the injection amount with respect to the screw advance distance can be reduced and high-precision molding can be performed. Moreover, an optimal injection apparatus can be used also from the point of the residence of resin in a heating cylinder. Furthermore, depending on the resin material, a dedicated injection device is prepared and selected for use, or a high-speed and high-pressure injection specification injection device is prepared and selected for use with thin molding, etc. It may be.

As a modification 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 shaft during molding. That is, in the molding method using the injection devices 14 and 15, the nozzle hole 54a is one Mr or not or if the nozzle hole 54a, the position of 54b injection device in response to when not directly facing the nozzle 41, 46 14, 15 may be moved. In the case of using the injection devices 14 and 15 and the molding method in which only one of the injection devices 14 and 15 is used, the injection device 14 at the time of molding corresponds to the material change of the injection devices 14 and 15 or insufficient plasticizing ability. , 15 may be moved.

Next, the third molding method shown in FIG. 6 will be described. In the third molding method, using the injection molding machine 11 for molding a composite molded product, the first mold without rotating the intermediate mold 30 using a plurality of the plurality of injection devices 14, 15 is used. A molten material is injected into a cavity formed between a fixed mold 20 and an intermediate mold 30 which are molds, and a multicolor composite molded product is molded. In the third molding method, the sequence control procedure is stored in the control device 53 and can be selected by input from the setting screen 52.

First, before molding, one block 71 having no cavity is attached between the movable platen 21 and the rotary plate 28 as the second platen. As a result, the movable platen 21 and the rotating platen 28 can be moved by the mold opening / closing mechanism 26 like a single platen. Therefore, the turntable 28 cannot be rotated. The molds attached to the fixed platen 19 and the rotary platen 28 are molds capable of multicolor molding by moving the core 72 by a driving means such as a hydraulic cylinder 73. When the space between the fixed mold 74 and the movable mold 75 is closed and clamped, the fixed mold 74 and the fixed mold 74 are arranged using the injection devices 14 and 15 disposed on the fixed plate 19 side which is the first plate. A composite molded product is molded in the cavity C3 formed between the movable molds 75.

At this time, after injection from one of the injection devices 14 into the cavity C3 and cooling and solidification to form a primary molded product, the hydraulic cylinder 73 of the movable mold 75 is operated to retract the core 72. Then, the cavity 72 newly formed by the retraction of the core 72 is injected from one of the other injection devices 15 to perform secondary molding, and is cooled and solidified in a form coupled with the primary molded product to form a composite molded product. Thereafter, the space between the fixed mold 74 and the movable mold 75 is opened, and the composite molded product attached to one of the molds is ejected by the ejector.

In the above, a molding die may be attached between the movable platen 21 and the rotating plate 28 instead of the block 71, and another molding may be performed between the movable platen 21 and the rotating plate 28. In this case, when the composite molded product is formed between the fixed plate 18 that is the first plate and the rotary plate 28, the movable plate 21 and the rotary plate 28 that are the second plate in parallel. Injecting from the injection device 17 into the cavity of the molding die attached to, another molded product is molded almost simultaneously. Then, after the fixed platen 18 and the rotary plate 28, and between the movable platen 21 and the rotary plate 28 are respectively opened, the rotary plate 28 is not rotated, and each molded product is separately ejected by an ejector. In this way, 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 a composite molded product, the structure of the mold clamping device 13 and the second injection unit on the second board side is the same as that of the embodiment of FIG. In another embodiment shown in FIG. 7, a plurality of injection devices 82 and 83 on the fixed platen 19 side, which is the first platen, are respectively mounted on different support tables 84 and 85 on the upper surface of the bed 12 a of the bed 12. It can be moved separately in directions other than the screw shaft. Specifically, as shown in FIG. 7, guide rails 86 and 86 are provided in a horizontal direction B orthogonal to the mold opening / closing direction, and a support base 84 is attached to the guide rails 86 and 86 by a hydraulic cylinder 87 serving as a driving unit. It is slidable. A base 88 is provided on the support base 84 so as to be movable in the mold opening / closing direction A (screw axis direction) by a hydraulic cylinder 89 of a nozzle touch mechanism. An injection device 82 on the base 88 is placed. Further, the injection device 83 is also placed on a support base 85 slidable on another guide rail 90, 90 provided in the direction B via a base 91, and a hydraulic cylinder 92 as another drive means. It is moved in the direction B and can be moved in the mold opening / closing direction A by the hydraulic cylinder 93 of the nozzle touch mechanism.

In the case of performing two-color molding, the injection molding machine 81 for molding a composite molded product moves one of the injection devices 82 and 83 suitable for molding to a position where it can contact the nozzle hole 95 of the fixed mold 94. be able to. When three-color molding is performed, both of the injection devices 82 and 83 can be moved to positions where they can be brought into contact with the two nozzle holes 95 of the fixed mold 92, respectively. In the embodiment shown in FIG. 7, even if the interval between the two nozzle holes 95 of the fixed mold 94 is different depending on the mold, the interval between the nozzles 96 and 97 can be changed accordingly.

Further, although not shown as a modification of FIG. 7, the two injection devices are mounted on a common support base, but only one injection device is on the support base and the other injection device. May be placed on another support stand that moves independently in a direction orthogonal to the mold opening and closing direction. Even in this example, the intervals between the nozzles of a plurality of injection devices can be changed. In the example of FIG. 7 and this modification, at least one of the plurality of injection devices may be movable in a direction B other than the screw shaft. In this case, the injection device when used in two-color molding is fixed and can be moved only in the mold opening / closing direction for nozzle touch. It is moved in a direction other than the screw shaft such as the horizontal direction B perpendicular to the mold opening / closing direction.

The present invention is not enumerated one by one, but is not limited to that of the above-described embodiment, and it goes without saying that those skilled in the art also apply modifications made in accordance with the spirit of the present invention. is there. For injection molding, the material is not limited, and includes materials that perform molding such as injection compression molding, foam molding, sandwich molding, and insert molding.

DESCRIPTION OF SYMBOLS 11,81 Injection molding machine 12 and 80 bed 13 compound molding product shaping | molding device 14,15,17,82,83 Injection device 18 Fixed platen 20,62,74,92 Fixed mold 21 Movable platen 22,75 Movable mold 28 Turntable 30 Intermediate mold 33, 38, 45, 51, 73, 87, 89, 92, 93 Hydraulic cylinders 34, 48 84, 85 Support base A Mold opening / closing direction B Horizontal direction perpendicular to mold opening / closing direction C1, C2, C3 cavity

Claims (3)

During the stationary platen to the fixed mold is mounted and a movable mold movable platen mounted, and an intermediate mold said stationary mold and a movable mold which is rotated about an axis perpendicular to the mold opening and closing direction In an injection molding machine for molding a composite molded article provided with at least three injection devices that can be matched to each other,
A plurality of injection devices having different capacities capable of injecting molten material into a cavity formed between the fixed mold and the intermediate mold , disposed on the opposite side of the fixed mold fixed mold mounting surface ;
Injection that is arranged on the opposite side of the mounting surface of the movable mold of the movable plate and is moved together with the movable plate by driving the mold opening / closing mechanism so that the molten material can be injected into a cavity formed between the movable mold and the intermediate mold With equipment,
An injection molding machine for molding a composite molded product, wherein a plurality of injection devices having different capacities are arranged so as to be movable in directions other than the screw shaft. During the stationary platen to the fixed mold is mounted and a movable mold movable platen mounted, and an intermediate mold said stationary mold and a movable mold which is rotated about an axis perpendicular to the mold opening and closing direction In an injection molding machine for a composite molded article provided with at least three injection devices that can be matched to each other,
A plurality of injection devices having different capacities capable of injecting molten material into a cavity formed between the fixed mold and the intermediate mold , disposed on the opposite side of the fixed mold fixed mold mounting surface ;
Injection that is arranged on the opposite side of the mounting surface of the movable mold of the movable plate and is moved together with the movable plate by driving the mold opening / closing mechanism so that the molten material can be injected into a cavity formed between the movable mold and the intermediate mold With equipment,
Among a plurality of injection devices having different capacities capable of injecting a molten material into a cavity formed between the fixed die and the intermediate die, between the plurality of injection devices and the movable die and the intermediate die and molding of the composite molded article using the injectable injection unit molten material into the cavity to be formed,
Between one injection device of a plurality of injection devices having different capabilities capable of injecting a molten material into a cavity formed between the fixed mold and the intermediate mold, and between the movable mold and the intermediate mold injection molding machine for a composite molded article molding, wherein the molding of the composite molded article using the injectable injection unit molten material into the cavity can be selected to be formed. During the stationary platen to the fixed mold is mounted and a movable mold movable platen mounted, and an intermediate mold said stationary mold and a movable mold which is rotated about an axis perpendicular to the mold opening and closing direction In an injection molding machine for molding a composite molded article provided with at least three injection devices that can be matched to each other,
A plurality of injection devices having different capacities capable of injecting molten material into a cavity formed between the fixed mold and the intermediate mold , disposed on the opposite side of the fixed mold fixed mold mounting surface ;
Injection that is arranged on the opposite side of the mounting surface of the movable mold of the movable plate and is moved together with the movable plate by driving the mold opening / closing mechanism so that the molten material can be injected into a cavity formed between the movable mold and the intermediate mold With equipment,
A composite molded product obtained by injecting a molten material into a cavity formed between a fixed mold and an intermediate mold without rotating the intermediate mold by using a plurality of injection apparatuses having a plurality of capabilities different from each other. An injection device capable of injecting a molten material into a cavity formed between one or a plurality of injection devices of a plurality of injection devices having different capabilities and the movable mold and the intermediate mold An injection molding machine for molding a composite molded product, characterized in that it can be selected from molding of a composite molded product performed by rotating an intermediate mold.