JP2011056927A - Multi-material injection molding machine and multi-material injection molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-material injection molding machine and a multi-material injection molding method, which have a good production efficiency considering required mold clamping force and can shorten a molding cycle accompanying a mold opening and closing. <P>SOLUTION: The multi-material injection molding machine 10 includes a mold 14, 15 attached to a first board 12, a mold 21, 22 attached to a second board 13, a middle mold 27 arranged between the mold 14, 15 and the mold 21, 22, a movement mechanism 29 moving the middle mold 27 or the cavity 28 at least in a direction perpendicular to a mold opening and closing direction, a first injection device 31 injecting to a plurality of first cavities C1, C1 formed respectively between the mold 14 and the middle mold 27 and between the mold 21 and the middle mold 27, and other injection device 32 except the first injection device 31, which carries out the injection to a plurality of other cavities C2, C2 formed between the mold 15 and the middle mold 27 and between the mold 22 and the middle mold 27 respectively, and different from the first cavities C1, C1 in shape. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a multi-material injection molding machine and a multi-material injection molding method for performing at least secondary molding on a primary molded product that has been primary molded.

  As a multi-material injection molding machine that performs at least secondary molding on a primary molded product that has been primary molded, those described in Patent Document 1 and Patent Document 2 are known. In Patent Document 1, a rotating plate is attached to a movable platen, and two movable molds attached to the rotating plate can be rotated. Two fixed molds are fixedly attached to the fixed platen. Then, the primary molded product molded by the primary injection is moved to the secondary molding position together with the movable mold, and the secondary injection is performed from different injection devices to form a multi-material molded product. However, Patent Document 1 has the following problems.

  That is, in Patent Document 1, since a plurality of molds are arranged in parallel to the board, a mold clamping force is required in proportion to the projected areas of both cavities. In the type having two molds and one cavity formed in each mold, only one molded product can be molded every time the mold is opened and closed. Therefore, in order to obtain one molded product, there is a problem that a clamping force for two surfaces is required.

  The thing described in patent document 2 as a thing corresponding to the said problem is known. In Patent Document 2, an intermediate mold (movable mold part) that rotates along a vertical axis is provided between the fixed mold and the movable mold. Then, after primary molding is performed between the fixed mold and the first mold part of the intermediate mold, the intermediate mold is reversed, and the second mold is formed in the cavity between the movable mold and the first mold part of the intermediate mold. Next molding is performed. At that time, the second mold part is inverted, and the next primary molding is performed in the cavity between the fixed molds. The type of Patent Document 2 has an advantage that the two cavities are overlapped in the mold opening / closing direction, so that the two cavities can be clamped with a mold clamping force for one surface of the cavity or a mold clamping force close thereto. However, with respect to Patent Document 2, when moving from primary molding to secondary molding, the movable plate is greatly opened to rotate so that the end of the intermediate mold does not come into contact with the fixed mold or the movable mold. As a result, there is a problem that the molding cycle becomes long. In addition, a large installation space is required due to the problem of daylight that greatly opens the movable plate. In addition, in Patent Document 2, it may be difficult to adjust the height of the intermediate mold with respect to the fixed mold or the movable mold when the mold is attached. On the other hand, it is conceivable that the device of Patent Document 2 is a vertical type, but in that case, in addition to the problem that the movable plate needs to be opened largely, the legs that support the rotating shaft of the intermediate mold are sturdy. There is a problem that needs to be made.

JP 2006-103205 A (Claim 2, 0035, FIG. 2) JP 2007-50585 (Claim 1, FIGS. 1 to 12)

  In the present invention, in view of the above problems, a multi-material injection molding machine and a multi-material injection molding method that have high production efficiency for the required clamping force and can shorten the molding cycle associated with mold opening and closing. The purpose is to provide.

  A multi-material injection molding machine according to claim 1 of the present invention is a multi-material injection molding machine that performs at least secondary molding on a primary molded product that has been primary molded, and a mold that is attached to a first board, A mold attached to the board, an intermediate mold disposed between the mold attached to the first board and the mold attached to the second board, and the intermediate mold or its cavity at least A moving mechanism for moving in a direction orthogonal to the mold opening / closing direction, and a mold between the mold and intermediate mold attached to the first board and a mold and intermediate mold attached to the second board, respectively. A first injection device for injecting into a plurality of primary cavities, a mold and an intermediate mold attached to the first board, and a mold and an intermediate mold attached to the second board, respectively. A plurality of other formed and different shapes from the primary cavity And other injection devices other than the first injection apparatus for performing an injection into the cavity, characterized in that is provided.

  A multi-material injection molding machine according to a second aspect of the present invention is the multi-material injection molding machine according to the first aspect, wherein an intermediate plate that is rotated or inverted about a rotation shaft provided in the mold opening / closing direction is disposed, and both surfaces of the intermediate plate are arranged. A plurality of intermediate molds and a cavity forming surface thereof are disposed respectively.

  A multi-material injection molding machine according to a third aspect of the present invention is the multi-material injection molding machine according to the first aspect, wherein an intermediate mold that is rotated or inverted about a rotation shaft provided in a mold opening / closing direction is disposed, and the intermediate mold A plurality of cavity forming surfaces are disposed on each of the two surfaces.

  A multi-material injection molding machine according to a fourth aspect of the present invention is the multi-material injection molding machine according to any one of the first to third aspects, wherein the first board and the second board are arranged in the vertical direction. It is a vertical injection molding machine in which the mold is opened and closed.

  A multi-material injection molding method according to claim 5 of the present invention is a multi-material injection molding method in which at least secondary molding is performed on a primary molded product which has been primary molded, and a mold attached to a first board, A mold attached to the board, an intermediate mold disposed between the mold attached to the first board and the mold attached to the second board, and the intermediate mold or its cavity at least A mold that is provided with a moving mechanism that moves in a direction orthogonal to the mold opening / closing direction, a first injection device, and an injection device other than the first injection device, and is attached to the first panel and an intermediate After injecting from the first injection device into a plurality of primary cavities formed between the mold and between the mold attached to the second board and the intermediate mold, a plurality of primary molded products are formed, Between the mold and intermediate mold attached to the first panel Injection from the other injection device into a plurality of other cavities respectively formed between a mold attached to the board 2 and an intermediate mold and connected to the primary molded product to form a plurality of multi-material molded products It is characterized by that.

  A multi-material injection molding machine or a multi-material injection molding method according to the present invention is a multi-material injection molding machine that performs at least secondary molding on a primary molded product that has been primary molded, a mold attached to a first board, A mold attached to the board, an intermediate mold disposed between the mold attached to the first board and the mold attached to the second board, and the intermediate mold or its cavity at least A moving mechanism for moving in a direction orthogonal to the mold opening / closing direction, and a mold between the mold and intermediate mold attached to the first board and a mold and intermediate mold attached to the second board, respectively. A first injection device for injecting into a plurality of primary cavities, a mold and an intermediate mold attached to the first board, and a mold and an intermediate mold attached to the second board, respectively. A composite formed and different in shape from the primary cavity. In addition to the first injection device for injecting into the secondary cavity, the production cycle is good for the required clamping force and the molding cycle accompanying the mold opening and closing Can be shortened.

FIG. 1 is a diagram showing a multi-material injection molding machine and a multi-material injection molding method according to the present embodiment, after the mold is opened and the intermediate plate is rotated to move the primary molded product to the secondary molding side. It is a figure which shows a state. FIG. 2 is a diagram showing a multi-material injection molding machine and a multi-material injection molding method according to the present embodiment, and shows a state where mold clamping and injection are performed. FIG. 3 is a diagram showing a multi-material injection molding machine and a multi-material injection molding method according to the present embodiment, and is a diagram showing a state when a multi-material molded product that has been opened and the secondary molding is completed is taken out. . FIG. 4 is a horizontal sectional view showing a multi-material injection molding machine according to another embodiment. FIG. 5 is a diagram showing a multi-material injection molding machine and a multi-material injection molding method according to still another embodiment, and is a diagram showing a state in which a primary molded product is molded by a primary cavity. FIG. 6 is a diagram illustrating a multi-material injection molding machine and a multi-material injection molding method according to still another embodiment, and is a diagram illustrating a state after the intermediate mold is moved after primary molding. FIG. 7 is a diagram showing a multi-material injection molding machine and a multi-material injection molding method according to still another embodiment, and is a diagram showing a state where a multi-material molded product is molded by a secondary cavity.

  A multi-material injection molding machine 10 according to this embodiment of the present invention shown in FIGS. 1 to 3 performs at least secondary molding on a primary molded product P1 subjected to primary molding. A vertical mold clamping device 11 of a multi-material injection molding machine 10 which is a vertical injection molding machine has a plurality of mold mounting surfaces on the upper surface of a lower fixed platen 12 fixedly disposed on a bed (not shown). Molds 14 and 15 (two in this embodiment) are attached. Each mold 14, 15 has one cavity forming surface 16, 17, and the shape of each cavity forming surface 16, 17 is different. More specifically, the cavity forming surface 16 of the mold 15 on the other side is formed flat to form the flat plate portion of the multi-material molded product P2 compared with the cavity forming surface 17 of the mold 15 on the other side. A concave portion for forming a frame portion of the multi-material molded product P2 is formed. In addition, nozzle touch surfaces 18 and 19 are formed on the outer side surfaces of the mold 14 on one side and the mold 15 on the other side, respectively, and a hot runner is formed inside.

  An upper pressure receiving plate (not shown) is arranged above the lower fixed platen 12, and four tie bars (not shown) are arranged vertically between the lower fixed platen 12 and the upper pressure receiving plate. An upper movable platen 13 is slidably inserted into the tie bar in parallel with the mold mounting surface of the lower fixed platen 12. A mold opening / closing / clamping mechanism 20 is disposed between the upper pressure receiving board and the upper movable board 13. In the present embodiment, the mold opening / closing / clamping mechanism 20 includes two mold clamping cylinders having rams and a mold opening / closing mechanism (not shown) so that the back surface of each mold can be directly pressed. However, the type and number of mold opening / closing and clamping mechanisms are not limited. A plurality of molds 21 and 22 (two in this embodiment) are mounted on the mold mounting surface on the lower surface of the upper movable platen 13. Each mold 21, 22 has one cavity forming surface 23, 24, and the shape of each cavity forming surface 23, 24 is different. That is, the mold 21 on one side of the upper movable plate 13 is attached at the same position as the mold 14 on one side of the lower fixed plate 12 when viewed from above, and the cavity forming surface 16 of the mold 14 on the one side is mounted. The cavity forming surface 23 having the same shape as that of FIG. The mold 22 on the other side of the upper movable plate 13 is mounted at the same position as the mold 15 on the other side of the lower fixed plate 12 as viewed from above, and the cavity forming surface 17 of the mold 15 on the other side is mounted. The cavity forming surface 24 having the same shape as that is formed.

  An intermediate plate 25 is provided between the lower fixed platen 12 and the upper movable platen 13. The intermediate plate 25 is fixed to a rotary shaft 26 that is a shaft provided in the mold opening / closing direction downward from the center position in the planar direction of the upper movable platen 13. The rotating shaft 26 is rotatably held by a bearing on the upper movable platen 13 and can be rotated by a rotating mechanism 29 (moving mechanism) such as an electric motor or a speed reducing mechanism. Accordingly, the intermediate mold 27 or its cavity 28 is moved at least in the direction orthogonal to the mold opening / closing direction by the rotation mechanism 29 which is a moving mechanism. Inside the rotary shaft 26 and the intermediate plate 25, a pipe of cooling water that flows into the intermediate die 27, an electric wire for a heater of the hot runner in the intermediate die 27 and the intermediate plate 25, and the like are disposed. The intermediate plate 25 and the rotary shaft 26 are movable in the mold opening / closing direction when the upper movable plate 13 is raised and the mold is opened. In the present embodiment, the intermediate plate 25 and the rotary shaft 26 are moved relative to the upper movable plate 13 by their own weight in the mold opening direction, but may be moved by power. The intermediate plate 25 and the rotary shaft 26 may be attached to the lower fixed platen 12 so as to be moved up and down. Further, the intermediate plate 25 may be provided on a stand standing up from a bed or the like, and the intermediate plate 25 may be rotated or reversed by a timing belt wound around the outer periphery of the intermediate plate 25. The moving mechanism is not limited.

  A plurality of intermediate molds 27 are attached to the upper and lower surfaces of the intermediate plate 25. Two intermediate dies 27, 27 are attached to the lower surface of the intermediate plate 25 so as to face the dies 14, 15 attached to the lower fixed plate 12. Each intermediate mold 27 is formed with one cavity forming surface 28 facing the cavity forming surfaces 16 and 17 of the molds 14 and 15. When the molds are combined with the cavity forming surfaces 16 and 17, a primary cavity C1 and a secondary cavity C2 which are different cavities are formed as shown in FIG. Also, two intermediate molds 27 and 27 are attached to the upper surface of the intermediate board 25 so as to face the molds 21 and 22 attached to the upper movable board 13 as the second board. The intermediate molds 27 and 27 are formed with one cavity forming surfaces 28 and 28, respectively, which are shaped when matched with the cavity forming surfaces 23 and 24 of the molds 21 and 22 attached to the upper movable platen 13. Different primary cavities C1 and C2 are formed. Accordingly, in the present invention, the intermediate mold 27 includes the molds 14 and 15 attached to the lower fixed platen 12 as the first plate and the molds 21 and 22 attached to the upper movable platen 13 as the second plate. Between the two. In the present embodiment, the four cavity forming surfaces 28 of the four intermediate molds 27 have the same shape, and rotate or rotate on a surface perpendicular to the mold opening / closing direction around the axis of the mold opening / closing direction (rotating shaft 26). Inverted. The primary molded product P1 that is primarily molded at the primary molding position S1 can be moved to a secondary molding position S2 that is a different molding position while being held on the cavity forming surface 28 of the intermediate mold 27.

  The mold clamping device 11 of the multi-material injection molding machine of this embodiment is a vertical mold clamping device comprising a lower fixed platen 12 and an upper movable platen 13, but a vertical mold clamping device comprising an upper fixed platen and a lower movable platen. It may be a device. Further, it may be a mold clamping device of a horizontal injection molding machine in which the movable plate moves in the horizontal direction. Furthermore, not only the vertical type and the horizontal type, the first board and the second board may be moved in the approaching and retracting direction with respect to the intermediate board that can rotate at a fixed position. The molds 14, 15, 21, 22, and 27 attached to the first board, the second board, and the intermediate board have a plurality of primary cavities C1 and C1 and the primary cavity C1 between the molds. As long as secondary cavities C2 and C2 having different shapes from C1 are formed, the number of molds may be one or more and is not limited. In other words, one mold may have a plurality of cavity forming surfaces. Further, the number of molds and cavity forming surfaces may be three or more, and other cavities may be formed at the same time as the third or higher molding using a cavity other than the secondary cavity and the third or higher cavity. In the present embodiment, as described above, the cavity forming surface 16 of the mold 14 on one side of the lower fixed platen, the cavity forming surface 23 of the mold 21 on one side of the upper movable platen 13, and the cavity of the mold 15 on the other side. The forming surface 17 and the cavity forming surface 24 of the other mold 22 are the same, and the four cavity forming surfaces 28 of the intermediate mold 27 are the same. However, the primary cavity C1 and the secondary cavity C2 having different shapes formed between the molds 14 and 15 of the lower fixed platen 12 and the mold 27 of the intermediate plate 25, and the molds 21 and 22 of the upper movable platen 13 and the middle are formed. In the primary cavity C1 and the secondary cavity C2 formed between the molds 27 of the board 25, the shapes of the primary cavities C1 and C1 and the secondary cavities C2 and C2 in the vertical direction are made different so that different multi-material molded products P2 are obtained. You may make it shape | mold. Moreover, it is good also considering a part or all of the runner until it reaches the primary cavity C1 and the secondary cavity C2 as a cold runner (sprue).

  On one side and the other side of the lower fixing plate 12 of the mold clamping device 11, a first injection device 31 for injecting a first resin material M1 into a plurality of primary cavities C1, C1 and a plurality of secondary cavities C2, A second injection device 32, which is another injection device for injecting the second resin material M2 to C2, is arranged such that the heating cylinders 33 and 34 and the nozzles 35 and 36 are in the horizontal direction. The nozzle 35 of the first injection device 31 that performs injection on the primary side is provided so as to be able to advance and retreat with respect to the nozzle touch surface 18 of the mold 14 on one side of the lower fixed platen 12. Further, the nozzle 36 of the second injection device 32 that performs injection on the secondary side is provided so as to be able to advance and retreat with respect to the nozzle touch surface 19 of the mold 15 on the other side of the lower fixed platen 12. The nozzles 35 and 36 of the first injection device 31 and the second injection device 32 are in contact with the lower fixed platen 12, the intermediate plate 25, the intermediate die 27, and the die attached to the upper movable platen 13. 21 and 22 and the side surface and parting surface of the upper movable board 13 may be sufficient. Further, the first injection device 31 and the second injection device 32 may be configured such that the nozzles are brought into contact with the molds 14, 15, 21, and 22 through holes formed in the lower fixed platen 12 and the upper movable platen 13. Good. The nozzles 35 and 36 may be shut off valves or the like. Further, two or more other injection devices may be provided, and a total of three or more injection devices may be provided.

  Next, the multi-material injection molding method of the multi-material injection molding machine 10 of this embodiment will be described. FIG. 1 shows an intermediate plate in a state in which a molded product P1 primarily molded at a primary molding position S1 on one side of a multi-material injection molding machine 10 is held on a cavity forming surface 28 of an intermediate mold 27 after being opened. This is the state after 25 is rotated and moved to the other secondary molding position S2. At the same time, the intermediate mold 27 located at the other secondary molding position S2 is the primary molding position S1 with the cavity forming surface 28 empty after the finished multi-material molded product P2 is taken out. Moved to. In addition, the intermediate | middle board 25 and the rotating shaft 26 may always be rotated to one direction, and after rotating 180 degree | times, it may be reversed 180 degree | times to a reverse direction and may return to an original position. Further, when the intermediate mold 27 or the like is mounted on three surfaces, it is desirable to rotate the intermediate plate 25 by 120 °.

  Next, as shown in FIG. 2, the mold clamping device 11 is operated to lower the upper movable platen 13 and the molds 21 and 22. At that time, the intermediate molds 27 and 27 attached to the lower surface side of the intermediate board 25 are brought into contact with the molds 14 and 15 attached to the lower fixed board 12, but the upper movable board 13 is still lowered. As the position is changed, the intermediate plate 25 and the rotary shaft 26 change relative to the upper movable plate 13 so that the intermediate die 27 attached to the upper surface side of the intermediate plate 25 and the die attached to the upper movable platen. 21 and 22 are also brought into contact with each other and are clamped. And between the mold 14 attached to the lower fixed platen 12 as the first plate and the intermediate die 27 located on one side and the mold 21 and one side attached to the upper movable platen 13 as the second plate A plurality of primary cavities C1 and C1 are formed at positions overlapping each other in the mold opening / closing direction between the intermediate molds 27 located at the same position. Further, the mold 15 attached to the lower fixed platen 12 serving as the first plate and the intermediate die 27 located on the other side and the mold 22 attached to the upper movable platen 13 serving as the second plate are located on the other side. A plurality of secondary cavities C2 and C2 are formed between the intermediate molds 27 to overlap each other in the mold opening / closing direction. The secondary cavities C2 and C2, which are cavities other than the primary cavities C1 and C1, are used in a state of being connected to the primary molded products P1 and P1, and the cavity forming surface 17 of the mold 15 and the primary molded product P1 (or A cavity is formed by the cavity forming surface 24 of the mold 22 and the primary molded product P1).

  Then, the first injection device 31 that performs injection on the primary side is brought into contact with the nozzle touch surface 18 of the mold 14 on one side of the lower fixed platen 12, and the second injection device 32 that performs injection on the secondary side is provided. The lower fixed platen 12 is brought into contact with the nozzle touch surface 19 of the mold 15 on the other side. The primary cavity C1 formed between the first mold 14 and the intermediate mold 27 at the primary molding position via the hot runner from the first injection device 31 in a state where the clamping force is exerted. The first resin material M1 from the first injection device 31 to a plurality of cavities C1 and C1 formed of the primary cavity C1 formed between the first mold 21 and the intermediate mold 27 at the primary molding position. Inject (fill and hold).

  A cavity formed between the cavity forming surface 17 of the mold 15 on the other side and the primary molded product P1 held on the intermediate mold 27 located on the other side from the second injection device 32 via a hot runner. C2, a plurality of cavities C2 and C2 each having a cavity C2 formed between the cavity forming surface 24 of the mold 22 on the other side and the primary molded product P1 held by the intermediate mold 27 located on the other side The resin material M2 is injected (filling and holding pressure). In the present embodiment, the primary molded product P1 molded by the primary molding is a flat plate, and a frame portion made of the second resin material M2, which is a different resin material by the secondary molding, surrounds the primary molded product P1. The multi-material molded product P2 is molded by being firmly attached to. In this case, the injection from the first injection device 31 and the second injection device 32 may be performed simultaneously or one of them may be performed first. In addition, by using a slide core for any one of the molds, the secondary cavity can be constituted by the cavity forming surface of both molds and the primary molded product P1.

  Next, as shown in FIG. 3, the mold opening / closing / clamping mechanism 20 is operated to open the mold. When the mold is opened, it is the reverse of mold closing. First, the space between the middle mold 27 on the upper surface side of the intermediate board 25 and the molds 21 and 22 of the upper movable board 13 is opened, and the upper movable board 13 is fixed. After the height is raised, the space between the intermediate mold 27 on the lower surface side of the intermediate plate 25 and the molds 14 and 15 of the lower fixed platen 12 is opened. When the intermediate plate 25 comes to an intermediate position between the lower fixed platen 12 and the upper movable platen 13, the operation of the mold opening / closing / clamping mechanism 20 is stopped. At that time, the primary molded product P1 is left in contact with the cavity forming surface 28 of the intermediate mold 27 located at the primary molding position S1, and the multi-material molded product P2 which is a secondary molded product (finished product) is The intermediate mold 27 is left in contact with the cavity forming surface 28 located at the next molding position S2. Then, the take-out machines 37 and 37 are entered from the other side of the intermediate board 25, the suction cups of the take-out machines 37 and 37 are adsorbed on the surface of the multi-material molded product P2, and taken out by moving again. At this time, release of the multi-material molded product P2 may be assisted by an unillustrated ejector or release air. The multi-material molded product P2 may be held by the molds 14, 15, 21, and 22 attached to the lower fixed platen 12 and the upper movable platen 13, and may be opened. The molds 15 and 27 may be held.

  When the take-out is completed, the intermediate plate 25 is rotated together with the rotary shaft 26 by operating the rotation mechanism 29, and the primary molded product P1 that has been primarily molded at the primary molding position S1 is held on the cavity forming surface 28 of the intermediate mold 27. It moves to a different molding position (secondary secondary molding position S2) depending on the state. When the movement is completed, the state again becomes as shown in FIG. 1 and the mold is closed. In the present embodiment, the mold 27 is attached to the intermediate plate 25 that rotates or reverses the surface perpendicular to the mold opening / closing direction about the axis in the mold opening / closing direction. Since the intermediate plate 25 and the intermediate die 27 are rotated or reversed in parallel with the dies 14, 15, 21, and 22 of the lower fixed platen 12 and the upper movable platen 13, the mold opening interval is larger than the type disclosed in Patent Document 2. The intermediate plate 25 can be rotated or reversed in a narrow state, and the molding cycle can be shortened. Further, since the idea of a stack mold in which a plurality of cavities C1 and C2 overlap in the mold opening / closing direction is taken in, the production efficiency is better for the required clamping force than the type of Patent Document 1, and at the same time A plurality of multi-material molded products P2 and P2 can be molded. By adopting the vertical mold clamping device 11, the first injection device 31 and the second injection device 32 can be arranged on both sides. Further, by adopting a structure in which the intermediate plate 25 is suspended from the upper movable plate 13 of the vertical mold clamping device 11, a power mechanism for moving the intermediate plate 25 in the mold opening / closing direction can be omitted.

  Next, a multi-material injection molding machine 40 according to another embodiment of the present invention shown in FIG. 4 will be described. A multi-material injection molding machine 40 according to another embodiment is an example in which a stack mold 43 capable of rotating an intermediate mold 42 is attached to a mold clamping device 41 of a horizontal injection molding machine. Accordingly, the mold clamping device 41 is not provided with an intermediate plate. In the mold clamping device 41, a tie bar 45 is disposed between a fixed plate 44 as a first plate and a pressure receiving plate (not shown), and a movable plate 46 as a second plate is inserted into the tie bar 45. A mold clamping mechanism 47 is disposed between the pressure receiving plate and the movable platen 46. The mold 48 attached to the stationary platen 44 has two cavity forming surfaces 49 and 50 having different shapes. Also, the mold 51 attached to the movable platen 46 is formed with two cavity forming surfaces 52 and 53 having different shapes at the same position as the die 48 attached to the fixed platen 44.

  Between the cavity forming surface 49 and the cavity forming surface 50 of the fixed-side mold 48, a cylindrical hot runner block 54 for sending the injected molten resin into the intermediate mold 42 is fixedly disposed. The front end side of the molten resin passage 55 of the hot runner block 54 is bent toward one side, and an opening 57 is formed on one side of the outer peripheral surface 56. Around the hot runner block 54, a disc-shaped intermediate mold 42 having an inner peripheral hole 58 through which the hot runner block 54 is inserted is disposed at the center. Two identical cavity forming surfaces 59 are formed on both the fixed and movable surfaces of the intermediate mold 42, respectively. When the mold is closed, two cavities having different shapes are formed by the cavity forming surfaces 59 and 59 of the intermediate mold 42 and the cavity forming surfaces 49 and 50 on the fixed mold side. When the mold is closed, cavities having different shapes are formed by the cavity forming surfaces 59 and 59 of the intermediate mold 42 and the cavity forming surfaces 52 and 53 on the movable mold side. Inside the intermediate mold 42, a hot runner molten resin passage 60 is formed from the cavity forming surface 59 toward the inner peripheral hole 58, and openings 61 are provided at two opposite positions of the inner peripheral hole 58. .

  Between the inner peripheral hole 58 of the intermediate mold 42 and the outer peripheral surface 56 of the hot runner block 54 is slidable, and the intermediate mold 42 is movable in the mold opening / closing direction. When the intermediate mold 42 is in the mold open position, the opening 57 of the hot runner block 54 and the opening 61 located on one side of the intermediate mold 42 are connected so that the hot runner communicates. Yes. Near the inner periphery of the intermediate mold 42, a hot runner molten resin passage 62 connected to the secondary cavity is formed, and an opening 64 is formed in the outer periphery 63. A cylindrical guide member 65 projects and is fixed to the outer peripheral portion 63 of the intermediate mold 42 from the fixed mold 48 to the movable mold 51 side. The outer peripheral portion 63 of the intermediate mold 42 is guided by the inner peripheral surface of the guide member 65. However, the guide member 65 is provided with an opening in a portion where a nozzle 67 of a second injection device 66 described later is inserted or a portion where a molded product is taken out.

  Although not shown, a rotation mechanism (moving mechanism) for rotating or reversing only the intermediate mold 42 around the axis 75 (virtual axis) in the mold opening / closing direction is attached to the guide member 65 and the like (hot). The runner block 54 may also be configured to rotate simultaneously. Further, hooks 68 that are engaged when the intermediate mold 42 is opened from the mold closing position are provided at a plurality of locations at the front end of the movable mold 51, and the intermediate mold 42 side has its engagement. A joint 69 is provided. The mechanism including the hook 68 is disengaged when the intermediate mold 42 reaches the mold opening position, and only the movable mold 51 is further opened. It should be noted that another mechanism may be used instead of the hook 68, and when the intermediate mold 42 is attached from the upper mold side of the vertical mold clamping device, the mechanism such as the hook 68 may not be used.

  The fixed plate 44 of the multi-material injection molding machine 40 is provided with a hole 72 into which the nozzle 71 of the first injection device 70 is inserted. A first injection device 70 in which a nozzle 71 and a heating cylinder 73 are arranged in the horizontal direction is disposed on the side of the fixed platen 44 opposite to the fixed mold so as to be able to advance and retreat. Further, a second injection device 66, which is another injection device in which the nozzle 67 and the heating cylinder 74 are disposed in the horizontal direction, is provided on the side that becomes the other side (reverse operation side) when the intermediate mold 42 is closed. It is arranged to be able to advance and retreat. Therefore, the first injection device 70 and the second injection device 66 are arranged in the orthogonal direction.

  Next, a multi-material injection molding method of the multi-material injection molding machine 40 of another embodiment shown in FIG. 4 will be described. The multi-material injection molding method of the multi-material injection molding machine 40 is basically the same as the multi-material injection molding method of the multi-material injection molding machine 10 of the present embodiment. A plurality of primary cavities formed at positions overlapping in the mold opening / closing direction at the primary molding position S1 are injected from the first injection device 70 and cooled to simultaneously form two primary molded products. Thereafter, after the mold is opened, only the intermediate mold 42 is rotated around the axis 75 (virtual axis) in the mold opening / closing direction, and the primary molded product held on the cavity forming surfaces 59 and 59 of the intermediate mold 42 is simultaneously removed. Move to the next molding side. That is, in another embodiment, the intermediate mold 42 is not moved and its cavities 59, 59 are moved from the primary molding position S1 to the secondary molding position S2 in the direction perpendicular to the mold opening / closing direction around the shaft 75. Then, the second injection device 66 re-injects the secondary cavities, which are other cavities formed in a position overlapping with the mold opening and closing direction by closing the mold and clamping again, and cooling them to simultaneously cool the two cavities. A multi-material molded product (finished product) is molded. At the same time, the cavity forming surfaces 59 and 59 of the intermediate mold 42 moved in an empty state from the secondary molding position S2 to the primary molding position S1 are again formed at the primary molding position S1. Two primary cavities are formed together with the cavity forming surface 52 of the mold 51 to form the next primary molded product. Then, the mold is opened again, and the removal of the secondary molded product and the movement of the primary molded product are repeated.

  Next, a multi-material injection molding machine 80 according to still another embodiment of the present invention shown in FIGS. 5 to 7 will be described. In a multi-material injection molding machine 80 according to yet another embodiment, a mold 83 is attached to a mold clamping device 81 of a vertical injection molding machine and an upper board 82 as a first board, and the mold The mold 83 has a single cavity forming surface 84 formed thereon. In addition, one die 86 is attached to the lower plate 85 which is the second plate, and a single cavity forming surface 87 is formed on the die 86. Between the upper board 82 as the first board and the lower board 85 as the second board, the intermediate board 88 is at least one side and the other side in the direction orthogonal to the mold opening / closing direction by a cylinder (not shown). It is attached so that reciprocation is possible. The intermediate board 88 can be moved in the mold opening / closing direction together with the mold opening / closing movement of the upper board 82 and / or the lower board 85.

  Two intermediate molds 89 and 90 are attached to one side and the other side of the upper surface of the intermediate board 88 so as to face the mold 83 of the upper board 82. The intermediate molds 89 and 90 are respectively formed with cavity forming surfaces 91 and 92 that face the mold 83 and the cavity forming surface 84 when positioned at the molding position. The cavity forming surfaces 91 and 92 have different shapes. Two intermediate molds 93 and 94 are attached to one side and the other side of the lower surface of the intermediate board 88 so as to be opposed to the mold 86 of the lower board 85. The intermediate mold 93 is formed with cavity forming surfaces 95 and 96 facing the mold 86 and the cavity forming surface 87 when positioned at the molding position. The cavity forming surfaces 95 and 96 have different shapes. Accordingly, the primary cavity C1 formed by the cavity forming surface 84 and the cavity forming surface 91 is different in shape from the secondary cavity C2 which is another cavity formed between the mold 83 and the intermediate mold 90. Further, the cavity forming surfaces 91 and 95 (or the cavity forming surfaces 92 and 96) of the intermediate molds 89 and 93 (or the intermediate molds 90 and 94) attached at the same position in the mold opening / closing direction have the same shape. Yes. Note that a single die having a plurality of cavity forming surfaces may be provided on the upper surface and the lower surface of the intermediate plate 88, respectively. Further, a plurality of cavity forming surfaces may be formed on both surfaces of the intermediate mold movable by the moving mechanism without providing the intermediate plate 88.

  Further, a first injection device 97 connected to the primary cavity C1 is provided on one side of the mold clamping device 81, and another injection device connected to the secondary cavity C2 on the other side of the mold clamping device 81. A second injection device 98 is provided. The nozzles of the first injection device 97 and the second injection device 98 are in contact with the side surfaces of the intermediate plate 88, respectively, and the molten resin is injected into the primary cavity C1 and the secondary cavity C2 through hot runners, respectively.

  Next, a multi-material injection molding method of the multi-material injection molding machine 80 according to still another embodiment of the present invention will be described. First, as shown in FIG. 5, the intermediate plate 88 is moved toward the other side, and then the mold clamping is performed, and the intermediate mold 89 and the mold 83 on one side, the intermediate mold 93 and the mold 86 on one side are performed. Primary cavities C1 and C1 are respectively formed between the two. Then, injection is performed from the first injection device 97 to the primary cavities C1 and C1 to form a primary molded product P1. Thereafter, when the mold is opened, the primary product P1 is held on the cavity forming surface 84 of the mold 83 and the cavity forming surface 87 of the mold 86, and the mold is opened. In this case, the amount of mold opening is very small, so that the cycle can be shortened. Then, as shown in FIG. 6, the intermediate plate 88 is moved from the other side to one side by a moving means (not shown) in a direction orthogonal to the mold opening / closing direction.

  Thereafter, the mold is clamped again, and between the intermediate mold 90 on the other side and the primary molded product P1 (between the intermediate mold 90 and the mold 83) and between the intermediate mold 94 on the other side and the primary molded product P1 (intermediate). Secondary cavities C2 and C2 are formed between the mold 94 and the mold 86, respectively. Then, the second injection device 98 performs injection to the secondary cavities C2 and C2 to form a multi-material molded product P2. Thereafter, the mold is opened, but the multi-material molded product P2 may be held by any of the cavity forming surfaces 84 and 92 (or the cavity forming surfaces 87 and 96). And the multi-material molded product P2 is taken out by an unillustrated take-out machine. Then, the intermediate plate 88 is moved again toward one side, and primary molding is performed again. In the present embodiment, it is possible to simultaneously mold a plurality of multi-material molded products P2 by the stack mold structure, and the production efficiency is good. 5 to 7 may be used in combination with means for changing the cavity shape by moving the pieces in the mold.

  The resin used in the present invention is not limited to the same resin (different colors and the same color) and different resins, and can be used for molding various general molded products having various shapes formed by multiple materials. In particular, it is effectively used for molding acrylic glass, vehicle resin window materials, television outer frames, headlight lenses, taillight lenses, and the like.

10, 40, 80 Multi-material injection molding machine 11, 41, 81 Clamping device 12 Lower fixed platen (first plate)
13 Upper movable board (second board)
14, 15, 21, 22, 48, 51, 83, 86 Mold 16, 17, 23, 24, 28, 49, 50, 52, 53, 59, 84, 87, 91, 92, 95, 96 Cavity formation Surface 25, 88 Intermediate plate 26 Rotating shaft 27, 42, 89, 90, 93, 94 Intermediate mold 29 Rotating mechanism (moving mechanism)
31, 70, 97 First injection device 32, 66, 98 Second injection device C1 Primary cavity C2 Secondary cavity P1 Primary molded product P2 Multi-material molded product S1 Primary molding position S2 Secondary molding position

Claims (5)

In a multi-material injection molding machine that performs at least secondary molding on a primary molded product that has been primary molded,
A mold attached to the first board;
A mold attached to the second board;
An intermediate mold disposed between a mold attached to the first board and a mold attached to the second board;
A moving mechanism for moving the intermediate mold or its cavity at least in a direction perpendicular to the mold opening and closing direction;
A first injection device that performs injection into a plurality of primary cavities formed between a mold and an intermediate mold attached to the first board and between a mold and an intermediate mold attached to the second board, respectively. When,
Injection into a plurality of other cavities formed between the mold and the intermediate mold attached to the first board and between the mold and the intermediate mold attached to the second board and having different shapes from the primary cavity. A multi-material injection molding machine comprising: an injection device other than the first injection device that performs the operation. An intermediate plate that is rotated or reversed about a rotation axis provided in the mold opening and closing direction is disposed,
2. The multi-material injection molding machine according to claim 1, wherein a plurality of intermediate molds and their cavity forming surfaces are disposed on both surfaces of the intermediate plate. An intermediate mold that is rotated or reversed about a rotation axis provided in the mold opening / closing direction is disposed,
The multi-material injection molding machine according to claim 1, wherein a plurality of cavity forming surfaces are disposed on both surfaces of the intermediate mold. 4. The vertical injection molding machine according to claim 1, wherein the first board and the second board are arranged in a vertical direction and are opened and closed in a vertical direction. 5. Multi-material injection molding machine described in 1. In the multi-material injection molding method of performing at least secondary molding on the primary molded product that has been primary molded,
A mold attached to the first board;
A mold attached to the second board;
An intermediate mold disposed between a mold attached to the first board and a mold attached to the second board;
A moving mechanism for moving the intermediate mold or its cavity at least in a direction perpendicular to the mold opening and closing direction;
A first injection device;
Other injection devices other than the first injection device,
Injection from the first injection device into a plurality of primary cavities formed between the mold and intermediate mold attached to the first board and between the mold and intermediate mold attached to the second board After forming multiple primary molded products,
A plurality of other cavities formed between the mold and the intermediate mold attached to the first board and between the mold and the intermediate mold attached to the second board and connected to the primary molded product; A multi-material injection molding method, wherein a plurality of multi-material molded products are molded by injection from the other injection device.