JP5633983B2 - Composite molding injection molding machine and its operating method - Google Patents

Description

In the present invention, an intermediate member is movably disposed in a mold opening / closing direction between a movable plate to which a movable mold is attached and a fixed plate to which a fixed die is attached, and the intermediate member is orthogonal to the mold opening / closing direction. An intermediate mold that rotates about a rotation axis in a direction to be rotated, and the movable mold, the fixed mold, and the intermediate mold are closed to form a cavity, respectively, and a composite molded product injection molding machine, It relates to its operating method.

As an injection molding machine for a composite molded product, those described in Patent Documents 1 to 4 are known. In the mold clamping device of Patent Document 1, two fixed molds are attached to a fixed platen, and a primary die and a secondary die are attached to a movable plate so as to be interchangeable with each other. At the same time, the mold is clamped. For this reason, a mold clamping force proportional to the projected area of the cavities of the two molds is required at the time of mold clamping, and there is a problem that the apparatus becomes large, and it is not suitable for molding a composite molded product having a relatively large area. It was. In order to solve the above problems, those described in Patent Documents 2 to 4 are known. The injection molding machines for composite molded articles described in Patent Document 2 to Patent Document 4 have a slight difference in structure, but between the movable platen to which the movable mold is attached and the fixed platen to which the fixed die is attached. The intermediate member is movably disposed in the mold opening / closing direction, and the intermediate member is provided with an intermediate mold that rotates about a rotation axis in a direction orthogonal to the mold opening / closing direction. The mold and the intermediate mold are closed to form cavities.

In these compound molded product injection molding machines of Patent Document 2 to Patent Document 4, since the cavities of the molds are provided so as to overlap in the mold opening and closing direction, the mold is proportional to the projected area of the cavity of one mold. Compared with the mold clamping device of Patent Document 1, there is an advantage that the mold clamping device can be made relatively small, or that a large-area composite molded product can be molded with the same mold clamping force. However, in the case of the injection molding machine for composite molded products of Patent Document 2 to Patent Document 4, when a mold is opened, if any mechanism provided separately is not used, which cavity is opened first. There was a problem that could not be controlled. In particular, in the case where a main part having a large area and an outer frame part having a small area around it are formed by composite molding, it is necessary to first open and release the side of the main part having a large area. For this reason, in Patent Document 2 and Patent Document 3, an attaching / detaching means including a locking rod and a locking rod fitting hole, a clamper, or the like is attached to the mold itself, and the other mold is mounted in a state in which one mold is securely engaged. It can be opened. However, in the injection molding machine for a composite molded article having such a structure, there is a problem that a clamper or the like needs to be attached to all the molds to be attached, and a special mold is required. In addition, since the mold clamper and the like are operated by actuators such as electricity, air, and hydraulic pressure, it is necessary to consider the handling of the piping.

Further, Patent Document 4 relates to a two-layer foam injection molding apparatus, in which an intermediate plate that can be fixed between a fixed plate and a movable plate is provided. And in patent document 4, a movable board and an intermediate | middle board can each be locked with respect to a tie bar. However, it is possible to open the mold between the fixed plate and the movable plate with the mold locked between the intermediate plate and the movable plate (moving both the intermediate plate and the movable plate in the mold opening direction). It was not.

JP 2002-264170 A (Claim 3, FIG. 1) JP 2009-23267 A (Claim 1, Claim 2, FIG. 1, FIG. 7) JP 2007-50585 (Claim 4 and FIG. 8) JP-A-7-195413 (Claim 1, FIG. 1, FIG. 5)

As described above, the intermediate member is movably disposed in the mold opening / closing direction between the movable platen to which the conventional movable mold is attached and the fixed plate to which the fixed die is attached. Injection molding of a composite molded product in which an intermediate mold that rotates about a rotation axis in a direction perpendicular to the center is provided, and the movable mold, the fixed mold, and the intermediate mold are closed to form cavities, respectively. In the case of a machine, there is a problem that an arbitrary cavity cannot be opened unless a detachable clamper or the like is provided in the mold.

In the present invention, in view of the above problems, a composite molded product that can hold a fixed position between the movable platen and the intermediate member without providing a detachable clamper or the like on the mold side in the mold clamping device is injected. It is an object of the present invention to provide a molding machine and an operating method thereof. Alternatively, in the above-described mold clamping device, the injection molding of a composite molded product capable of stably performing injection compression molding between the fixed mold and the intermediate mold without providing a detachable clamper or the like on the mold side. It is an object to provide a machine and its operating method.

According to a first aspect of the present invention, the intermediate member is movable in the mold opening and closing direction between the movable plate to which the movable mold is attached and the fixed plate to which the fixed die is attached. The intermediate member is provided with an intermediate mold that rotates about a rotation axis in a direction orthogonal to the mold opening / closing direction, and the movable mold, the fixed mold, and the intermediate mold are closed. In an injection molding machine for composite molded products each having a cavity, at least a lock mechanism capable of holding the position of the intermediate member fixedly with respect to the movable plate is provided between the intermediate member and the movable plate. Two or more are provided, and the intermediate member is fixedly held with respect to the movable platen by the lock mechanism, and is attached to the fixed platen by operation of a mold clamping cylinder provided separately from a mold opening / closing mechanism for moving the movable platen. Against fixed mold The intermediate mold mounted between member is moved together with the movable platen, and performing injection compression molding in a cavity formed between the stationary mold and the intermediate mold.

Injection molding machine of the composite molded member according to claim 2 of the present invention, in claim 1, wherein the locking mechanism is a combination of a servomotor and a ball screw and a ball screw nut which also serves as a moving mechanism of the intermediate member, the movable platen The mold opening / closing mechanism that moves the head toward the fixed plate is also a combination of a servo motor, a ball screw, and a ball screw nut .

According to a third aspect of the present invention, there is provided a method for operating an injection molding machine for a composite molded article, wherein an intermediate member is disposed in a mold opening / closing direction between a movable platen to which a movable mold is attached and a fixed platen to which a fixed die is attached. The intermediate member is movably disposed, and the intermediate member is provided with an intermediate mold that rotates about a rotation axis in a direction orthogonal to the mold opening / closing direction, and the movable mold, the fixed mold, and the intermediate mold are molds. In a method of operating an injection molding machine for a composite molded product, each of which is closed to form a cavity, the position of the intermediate member is fixedly held with respect to the movable platen between the intermediate member and the movable platen. Operation of a clamping cylinder provided separately from a mold opening / closing mechanism provided with at least two possible locking mechanisms, wherein the locking mechanism holds the intermediate member fixedly to the movable platen and moves the movable platen attached to the stationary platen by The intermediate mold attached to the intermediate member relative to Teikin type is moved together with the movable platen, and performing injection compression molding in a cavity formed between the stationary mold and the intermediate mold.

In the composite molded product injection molding machine according to the present invention, an intermediate member is movably disposed in a mold opening and closing direction between a movable plate to which a movable mold is attached and a fixed plate to which a fixed die is attached. The member is provided with an intermediate mold that rotates about a rotation axis perpendicular to the mold opening / closing direction, and the movable mold, the fixed mold, and the intermediate mold are closed to form cavities, respectively. In the composite molded product injection molding machine, between the intermediate member and the movable platen, at least two or more lock mechanisms that can hold the position of the intermediate member with respect to the movable platen are provided, The intermediate member is fixedly held with respect to the movable platen by the lock mechanism, and a fixed mold attached to the fixed platen by operation of a mold clamping cylinder provided separately from a mold opening / closing mechanism for moving the movable platen. On the other hand, attached to the intermediate member It is moved together with the movable platen and the intermediate mold, since the injection compression molding in a cavity formed between the stationary mold and the intermediate mold, the side of the mold without providing a freely clamper like removable Injection compression molding can be performed while holding a fixed position between the movable platen and the intermediate member .

FIG. 1 is a schematic view showing a state in which a fixed mold, a movable mold, and an intermediate mold are opened and a previous composite molded product is taken out in the composite molded product injection molding machine of the present embodiment. FIG. 2 is a schematic view showing a state in which primary molding is performed with the fixed mold, the movable mold, and the intermediate mold being clamped in the injection molding machine for composite molded products of the present embodiment. FIG. 3 is a schematic view showing a state where secondary molding is performed in the injection molding machine for composite molded products of the present embodiment. FIG. 4 is a schematic view showing a state where the cavity on the side where the secondary molding is performed is strongly opened in the composite molding product injection molding machine of the present embodiment. FIG. 5 is a schematic view showing a state where the fixed mold, the movable mold, and the intermediate mold are opened in the injection molding machine for the composite molded product of the present embodiment. FIG. 6 is a schematic view showing a state where the intermediate mold is rotated in the injection molding machine for the composite molded product of the present embodiment. FIG. 7 is a front view of the intermediate member, the intermediate plate, and the intermediate mold in the injection molding machine for the composite molded product of the present embodiment.

An injection molding machine 11 for a composite molded product according to an embodiment of the present invention will be described with reference to FIG. The composite molded product injection molding machine 11 includes a mold clamping device 12 and a first injection device 13 and a second injection device 14 provided on both sides thereof. The mold clamping device 12 will be described. A linear movement guide such as a linear guide is fixed to the bed in the mold opening / closing direction, and a movable mold 15 as a first mold is mounted on the linear movement guide. A movable board 16 as a first board is provided. The movable mold 15 is provided with a cavity forming surface 17 for forming the outer frame portion A having a small area of the composite molded product by primary molding and a resin passage 18 communicating with the cavity forming surface 17. On the other side of the movable platen 16, a fixed platen 20 as a second plate, to which a fixed die 19 as a second die is attached, is fixed on the bed. The fixed mold 19 is provided with a cavity forming surface 21 for forming a main part B having a large area of composite molding by secondary molding and a resin passage 22 communicating with the cavity forming surface 21. Therefore, the cavity forming surface 17 of the movable mold 15 and the cavity forming surface 21 of the fixed mold 19 are different in shape.

Next, the mold clamping cylinder 23 which is a mold clamping mechanism will be described. Near the four corners of the stationary platen 20, mold clamping cylinders 23 (the cross section of only one mold clamping cylinder 23 is shown in the schematic view of FIG. 1 and the like), and the ram of the mold clamping cylinder 23 constitutes a tie bar 24. . The mold clamping cylinder 23 is a bi-directionally operated cylinder, and a large area mold clamping oil chamber 25 is provided on the tie bar 24 side in the fixed platen 20 and on the side opposite to the tie bar (second injection device side). Is provided with a powerful open oil chamber 26 having a small area. The mold clamping cylinder 23 is provided with adjusting means 27 for correcting the position of the tie bar 24 which is changed by mold clamping and strong mold opening every cycle. Each mold clamping cylinder 23 is desirably individually controlled by a servo valve (not shown) or the like. In the above case, position sensors (not shown) for detecting positions are provided between the fixed plate 20 and each ram or between the four corners of the fixed plate 20 and the four corners of the movable plate 16, respectively. The movable platen 16 is controlled in parallel to the fixed platen 20 by detecting and controlling a proper positional relationship.

Then, on the other side of the four tie bars 24 provided in parallel from the fixed plate 20 toward the movable platen 16 side, a locking portion 29 made up of a plurality of concave grooves for locking the half nut 28 is opened and closed. It is provided over a predetermined length in the direction. The tie bar 24 is inserted in the vicinity of the four corners of the movable platen 16, and the movable platen 16 is moved in the mold opening / closing direction on the linear guide while being guided by the tie bar 24. The half nut 28 is disposed around a portion of the movable platen 16 on the side opposite to the fixed platen where the tie bar 24 is inserted, and between the engagement position and the disengagement position with respect to the locking portion 29 of the tie bar 24. It is provided so that it can reciprocate.

Next, the mold opening / closing mechanism 30 will be described. A servo motor 31 of a mold opening / closing mechanism 30 is fixed to a bracket 20a provided on the fixed plate 20 or the bed, and a ball screw 32 is pivotally supported. The drive shaft of the servo motor 31 and the ball screw 32 are connected. A ball screw nut 33 is fixed to the bracket 16 a provided on the movable platen 16, and the ball screw 32 is inserted into the ball screw nut 33. The servo motor 31 can hold the movable plate 16 in a fixed position with respect to the fixed plate 20 or the bed by servo-locking. The servo motor 31 can control the movement and position of the movable mold 15 and the movable platen 16 by a built-in rotary encoder 31a. In the schematic view of FIG. 1 and the like, the mold opening / closing mechanism 30 is omitted and only one is shown. However, as shown in FIG. 7, the mold opening / closing mechanism 30 is provided at diagonal positions on both sides of the fixed platen 20 and the movable platen 16. Is provided.

Next, the intermediate member 35 and the intermediate molds 38 and 39 will be described. Between the fixed plate 20 to which the fixed mold 19 is attached and the movable plate 16 to which the movable die 15 is attached, an intermediate member 35 is disposed so as to be movable in the mold opening / closing direction. As shown in FIG. 1 and the like and FIG. 7, the intermediate member 35 is a disc body having a constant thickness, and has a frame shape having an opening at the center. The tie bars 24 are inserted in the vicinity of the four corners of the intermediate member 35. Between the middle part of the upper beam member 35a through which the upper two tie bars 24, 24 are inserted and the middle part of the lower beam member 35b through which the lower two tie bars 24, 24 are inserted. A rotating shaft 36 is provided in the direction (direction orthogonal to the mold opening / closing direction). The upper portion of the rotary shaft 36 is rotatably held by a radial bearing (not shown) provided in the through hole of the upper beam member 35a. The lower portion of the rotary shaft 36 is supported by its own weight by a thrust bearing (not shown) provided on the lower beam member 35b and rotatably. An intermediate disc 37 is fixed to the rotary shaft 36 and rotates with the rotary shaft 36 about the axis of the rotary shaft 36. A first intermediate mold 38 and a second intermediate mold 39 are attached to the board surfaces on both sides of the intermediate board 37, respectively. Accordingly, the intermediate molds 38 and 39 also rotate around the axis of the rotary shaft 36.

The cavity forming surfaces of the intermediate dies 38 and 39 have the same shape, and the cavity forming surface 34a that forms the primary cavity A1 during the primary molding and the secondary cavity B1 during the secondary molding. Cavity forming surfaces 34b to be formed are respectively formed. Each of the first intermediate mold 38 and the second intermediate mold 39 incorporates an ejector mechanism (not shown) for projecting the finished composite molded product. As shown in FIG. 2, when the first intermediate mold 38 is closed with the movable mold 15 to form the primary cavity A1 for primary molding, the second intermediate mold 39 is When the mold is closed with the fixed mold 19 to form a secondary cavity B1 for secondary molding, the mold is once opened after that, and the intermediate plate 37 is rotated 180.degree. The mold 38 is closed with the fixed mold 19 to form a secondary cavity B1 for secondary molding, and the second intermediate mold 39 is closed with the movable mold 15 to form a primary cavity for primary molding. A1 is formed.

A servo motor 40 for rotating the intermediate panel is disposed at the upper part of the central portion of the upper beam member 35a of the intermediate member 35. The drive shaft of the servo motor 40 and the rotary shaft 36 of the intermediate plate 37 are connected via a belt or a speed reducer, and the rotation angle is controlled by the rotation of the servo motor 40 so that the intermediate plate 37 is rotated. Yes. The intermediate member 35 is provided with positioning pins 41 for positioning and fixing the intermediate plate 37 in at least one place. The positioning pin 41 includes a hydraulic cylinder and a pin whose taper shape is tapered. The intermediate plate 37 is provided with positioning holes in at least two positions where the positioning pins 41 can be inserted when the intermediate plate 37 faces the fixed plate or the like. Then, the intermediate plate 37 is fixed in a non-rotatable position by projecting the positioning pin 41 and inserting it into the positioning hole. The position of the positioning pin 41 is not limited as shown in FIG. 1 or the like or FIG.

Next, the lock mechanism 42 of the intermediate member 35 will be described. Between the intermediate member 35 and the movable platen 16, there is provided a lock mechanism 42 that controls the movement of the intermediate member 35 and can hold the position of the intermediate member 35 fixedly with respect to the movable platen 16. In the schematic view of FIG. 1 and the like, only one lock mechanism 42 is omitted, but at least two, more preferably four are arranged as shown in FIG. Specifically, with respect to the lock mechanism 42, brackets 16b are fixed outward at positions near the four corners of the movable platen 16, servo motors 43 are fixed to the brackets 16b, and ball screws 44 are pivotally supported. . The drive shaft of the servo motor 43 and the ball screw 44 are connected. Ball screw nuts 45 are respectively fixed to the brackets 35 c provided on both sides of the intermediate member 35, and the ball screw 44 is inserted into the ball screw nut 45. The servo motor 43 can control the movement and position of the intermediate member 35 by a built-in rotary encoder 43a, and the servo motor 43 is servo-locked so that the intermediate plate 37 is fixed to the movable plate 16. Can hold position. The servo motors 43 and 31 of the lock mechanism 42 and the mold opening / closing mechanism 30 and the ball screws 44 and 32 may be directly connected, or may be connected via a pulley, a timing belt, or a speed reducer. Further, the servo motor 43 and the servo motor 31 may be attached to the intermediate member 35 and the movable platen 16 side. Further, the lock mechanism 42 may use another actuator such as a hydraulic cylinder.

Next, the injection device will be described. A first injection device 13 is provided on one side of the movable platen 16. In the present embodiment, the first injection device 13 is provided so as to be movable as the movable plate 16 is moved to open and close the mold, and is further moved forward and backward with respect to the movable mold 15. Note that the first injection device 13 may be fixed to the upper part of the movable platen 16 or arranged in a direction perpendicular to the mold clamping device 12. When the first injection device 13 is arranged in a direction perpendicular to the mold clamping device 12, when the intermediate molds 38 and 39 and the movable mold 15 are clamped, any one of the molds 15 and 38 is used. , 39, or a position where the nozzle contacts the side surface of the movable platen 16 or the intermediate member 35. A second injection device 14 is provided on the other side of the fixed platen 20. In the present embodiment, the second injection device 14 is provided on the bed and can advance and retreat with respect to the fixed mold 19.

Next, the operation method of the composite molded product injection molding machine 11 will be described with reference to FIGS. First, FIG. 1 shows a movable plate 16 as a first plate to which a movable die 15 as a first die is attached, and an intermediate member 35 to which intermediate dies 38 and 39 are attached to respective surfaces. It is in a state in the open completion position. In this state, the movable platen 16 and the intermediate member 35 are fixedly held by the servo motor 31 of the mold opening / closing mechanism 30 and the servo motor 43 of the lock mechanism 42 of the intermediate member 35. The intermediate plate 37 is fixed by positioning pins 41 of the intermediate member 35. The composite molded product C molded last time is projected by the ejector mechanism of the first intermediate mold 38 and is taken out by an unillustrated unloader. Further, the rotated second intermediate mold 39 is in a state where the outer frame portion A, which is a primary molded product molded last time, remains. Next, the servo motor 31 of the mold opening / closing mechanism 30 is driven to move the movable platen 16 toward the fixed platen 20. At the same time, the servo motor 43 of the lock mechanism 42 of the intermediate member 35 is driven, and the intermediate member 35 is moved in the direction in which it contacts the movable platen 16. However, since the moving speed of the intermediate member 35 toward the movable platen 16 at this time is about half of the moving speed of the movable platen 16 toward the fixed platen 20, the intermediate member 35 is actually intermediate to the fixed platen 20. The member 35 is also moved in the approach direction.

Then, as shown in FIG. 2, when the mold closing of the first intermediate mold 38 and the movable mold 15 and the fixed mold 19 and the second intermediate mold 39 is completed, the positioning pin 41 is removed, The half nut 28 is engaged with the locking portion 29 of the tie bar 24. Then, hydraulic oil is supplied to the mold clamping oil chamber 25 of the mold clamping cylinder 23 to perform mold clamping. At this time, the servo motors 31 and 43 of the mold opening / closing mechanism 30 and the locking mechanism 42 of the intermediate member 35 are operated in a free state or slightly according to mold clamping. After confirming the completion of the mold clamping, the first injection device 13 performs injection to the primary cavity A1 for molding the outer frame portion A formed between the movable mold 15 and the first intermediate mold 38. Next molding is performed. In the present embodiment, the primary molding is performed by general injection molding.

Next, the mold clamping cylinder 23 is depressurized to release the mold clamping force, and the servo motor 31 of the locking mechanism 42 of the intermediate member 35 is servo-locked (positioned) while the servo motor 31 of the mold opening / closing mechanism 30 is free. . Then, as shown in FIG. 3, a secondary cavity B1 (partially a primary molded product A) for molding a main part B formed between the fixed mold 19 and the second intermediate mold 39. The secondary molding is performed at a timing different from the primary molding. The main part B of the composite molded product C has a larger area and a smaller plate thickness than the outer frame part A. Therefore, in the secondary molding, molding is performed by injection compression molding. In injection compression molding, when injection is performed from the second injection device 14 to the secondary cavity B1, the volume of the secondary cavity B1 is temporarily increased by the resin pressure. Are individually controlled by the compression molding of the molten resin in the secondary cavity B1. The compression start timing of compression molding is performed at an appropriate timing based on the screw position, the pressure of the clamping cylinder 23, the pressure in the cavity, a timer, and the like.

At this time, since the movable platen 16 and the intermediate member 35 are fixedly held by the lock mechanism 42 as described above, the second intermediate mold 39 is moved directly by the operation of the mold clamping cylinder 23. The thickness (or pressure) of the secondary cavity B1 between the second intermediate mold 39 and the fixed mold 19 can be controlled by the mold clamping cylinder 23. In particular, when the four mold clamping cylinders 23 are individually controlled and the position of the tie bar 24 is relatively changed, it is assumed that a force in the opening direction is applied to the second intermediate mold 39. By fixing the intermediate member 35 to the movable platen 16 with the four lock mechanisms 42 of the intermediate member 35, it becomes possible to always maintain the parallelism of the intermediate member 35 with respect to the movable platen 16, and consequently the fixed platen. Thus, the parallelism of the intermediate member 35 with respect to 20 can be maintained. It is an indispensable condition to perform injection compression molding by locking the locking mechanism 42 of the intermediate member 35 .

Alternatively, after the depressurization, the fixed mold 19 and the second intermediate mold are supplied by supplying hydraulic oil to the strong mold opening oil chamber 26 of the clamping cylinder 23 or operating the mold opening / closing mechanism 30. The volume of the secondary cavity B <b> 1 formed between the molds 39 may be enlarged before injection, and then injection may be performed from the second injection device 14. In that case, the side of the secondary cavity B1 between the second intermediate mold 39 and the fixed mold 19 is not the side of the primary cavity A1 between the movable mold 15 and the first intermediate mold 38. It needs to be opened reliably. At that time, the servo motor 43 of the lock mechanism 42 of the intermediate member 35 is servo-locked, so that the movable plate 15 and the intermediate member 35 are fixedly held so that the movable die 15 and the first intermediate die are fixed. The primary cavity A1 between 38 is not opened, the second intermediate mold 39 is moved with respect to the fixed mold 19, and the position of the secondary cavity B1 is controlled so as to be the set cavity interval. Thereafter, the injection is started from the second injection device 14. The above method is also called an injection press (included in injection compression molding), and is advantageous for molding a molded product having a thinner plate thickness.

Then, the main part B is secondarily formed by injection compression molding, and when the cooling is completed, the process moves to the strong mold opening. Since a large mold opening force is required for releasing the main part B having a large area, it is necessary to supply the hydraulic oil to the strong mold opening oil chamber 26 of the mold clamping cylinder 23 to perform strong mold opening. In the strong mold opening as shown in FIG. 4, the primary between the movable mold 15 and the first intermediate mold 38 is the same as in the case of the injection press that expands the cavity volume before the injection compression molding. Without opening the cavity A1, it is necessary to reliably open the secondary cavity B1 in which the composite molded product C between the second intermediate mold 39 and the fixed mold 19 has been molded. (When the primary cavity A1 between the movable mold 15 and the first intermediate mold 38 is first strongly opened by the mold clamping cylinder 23, the servo motor 31 of the mold opening / closing mechanism 30 and the servo motor of the lock mechanism 42). 43, it is necessary to release the main part B having a large area, but the mold opening force is insufficient.) Therefore, by servo-locking the servo motor 43 of the lock mechanism 42 of the intermediate member 35, the movable platen 16 and the intermediate member 35 are fixedly held so that the primary cavity A1 between the movable mold 15 and the first intermediate mold 38 is not opened. The mold 39 is moved to open the second intermediate mold 39 by a predetermined interval. At this time, the force for servo-locking the servo motor 43 of the lock mechanism 42 is required to be larger than the force required for releasing the secondary cavity B1, and the servo motor 43 that does not cause an overload abnormality is selected. The position of the intermediate member 35 held by the servo motor 43 when the powerful mold is opened may be controlled by the same purpose and replaceable control, such as speed control of the intermediate member 35 toward the movable platen 16. Further, when locking the intermediate member 35, it is desirable to lock the intermediate member 35 after performing parallel control so that the position of the intermediate member 35 with respect to the movable platen 16 is parallel by the four servo motors 43 and the rotary encoder 43a. Further, it is desirable to insert the positioning pins 41 for positioning the intermediate plate 37 before opening the strong mold.

Then, after the intermediate member 35 and the second intermediate mold 39 are opened by a predetermined distance, the engagement of the half nut 28 is released. Thereafter, the movable platen 16 is moved in the mold opening direction by driving the servomotor 31 of the mold opening / closing mechanism 30 and the servomotor 43 of the lock mechanism 42 of the intermediate member 35 is also driven to move the intermediate member 35 away from the movable platen 16. The outer frame portion A that is primarily molded in the primary cavity A1 between the movable mold 15 and the first intermediate mold 38 is also released from the mold. Then, as shown in FIG. 5, the movable platen 16 and the intermediate member 35 are moved to the mold opening completion position. Next, as shown in FIG. 6, after the positioning pin 41 is removed from the hole of the intermediate plate 37, the servo motor 40 for rotating the intermediate plate provided on the upper beam member 35 a of the intermediate member 35 is driven to drive the intermediate plate 37. At the same time, the first intermediate mold 38 in which the primary molded product A remains and the second intermediate mold 39 in which the secondary molding is completed and the composite molded product C remains are rotated. The intermediate molds 38 and 39 may be started in parallel with the movement of the intermediate member 35. When the rotation is completed, the state shown in FIG. 1 is obtained again, and the composite molded product C is projected by the ejector mechanism. The composite molded product C may be taken out before the intermediate plate 37 or the like is rotated. In this embodiment, the outer frame portion A is formed by primary molding, and the main portion B is formed by secondary molding to form the composite molded product C. However, the main portion B is molded by primary molding, and the secondary molding is performed. The outer frame portion A may be formed by molding to form the composite molded product C, and the position where the primary molding and the secondary molding are performed is not limited to which side.

Further, the present invention is not limited to the above embodiment, and may be as follows. In the above embodiment, the first mold and the first board are the movable mold 15 and the movable board 16, and the second mold and the second board are the fixed mold 19 and the fixed board 20. On the other hand, even if the first mold and the first board are the fixed mold 19 and the fixed board 20, and the second mold and the second board are the movable mold 15 and the movable board 16, Good . Further, a locking mechanism for the intermediate member may be provided between the first plate on which the mold clamping cylinder is provided and the intermediate member, and the intermediate member may be locked by being pressed against the second plate. It may be provided at two places between the first board and the intermediate member and between the intermediate member and the second board. When the lock mechanism is provided at two locations, the lock mechanism may also serve as the mold opening / closing mechanism, or the mold opening / closing mechanism may be provided separately.

The intermediate member may be as follows. (1) An upper intermediate member through which the upper two tie bars are inserted and a lower intermediate member through which the lower two tie bars are inserted are provided separately, and between the central portion of the upper intermediate member and the central portion of the lower intermediate member. An intermediate member provided with a rotating shaft. (2) An intermediate member in which a rotatable intermediate plate is erected on a member that is movably disposed on a bed and through which two lower tie bars are inserted. (3) An intermediate member in which a rotatable board surface is erected on a member that is movably disposed on a bed without being inserted through all tie bars. (4) In the above (2) and (3), a rotating table is arranged on the upper surface of the intermediate member without an intermediate plate standing (in this case, a cavity forming surface on both sides on the rotating table) One intermediate mold provided with is placed). Further, the intermediate plate that can rotate the intermediate member may be provided with four or six intermediate mold attachment surfaces, and the intermediate die may be attached to each. In addition, the intermediate plate or the rotary plate of the intermediate member may be, for example, one that rotates 180 ° and then rotates 180 ° in the same direction and returns to the original position, and after rotating 180 °, reverses 180 ° and returns to the original position. It may be a thing. In the present invention, the intermediate mold is called rotatable or rotatable in both cases. Further, the rotating shaft may be provided in the horizontal direction as long as it is perpendicular to the mold opening / closing direction.

In addition, the mold clamping device of the injection molding machine of the composite molded product of the present invention may use a vertical mold clamping device that opens and closes in the vertical direction. Further, the mold clamping mechanism may be one in which a mold clamping cylinder is provided between the movable platen and the movable mold clamping plate without the mold clamping cylinder being provided in the tie bar portion. Further, the mold clamping mechanism may be one using an electric motor and a toggle mechanism or another type other than one using a mold clamping cylinder. Furthermore, the type and arrangement of the injection device are not limited to those described above. For example, two injection devices for injecting different materials on the outside of the fixed platen may be provided, and a composite molded product made of three materials may be formed using three injection devices together with the injection device on the outside of the movable platen. Is possible.

  The composite molded product injection molding machine of the present invention is suitably used for molding large composite molded products such as a window portion made of a transparent resin and a frame portion and a television frame portion to be molded with two materials. However, the molded product and the molding material are not limited, and the molded product or the molding material may be formed by molding a composite molded product only by general injection molding, combined with foam molding, or combined with bonding.

11 Injection Molding Machine 12 Mold Clamping Device 15 Movable Mold 16 Movable Plate 19 Fixed Mold 20 Fixed Plate 23 Clamping Cylinder 28 Half Nut 30 Mold Opening / Closing Mechanism 31, 40, 43 Servo Motor 32, 44 Ball Screw 33, 45 Ball Screw Nut 35 Intermediate member 36 Rotating shaft 37 Intermediate plate 38 First intermediate mold 39 Second intermediate mold 42 Lock mechanism

Claims (3)

An intermediate member is movably disposed in the mold opening / closing direction between the movable platen to which the movable mold is attached and the fixed platen to which the fixed die is attached, and the intermediate member rotates in a direction orthogonal to the mold opening / closing direction. In an injection molding machine for a composite molded article, in which an intermediate mold that rotates about an axis is provided, and the movable mold and the fixed mold and the intermediate mold are closed to form cavities, respectively.
Between the intermediate member and the movable platen, at least two or more locking mechanisms that can hold the position of the intermediate member fixedly with respect to the movable platen are provided,
The intermediate member is fixedly held with respect to the movable platen by the lock mechanism,
The intermediate mold attached to the intermediate member is moved together with the movable plate to the fixed die attached to the fixed plate by the operation of the mold clamping cylinder provided separately from the mold opening / closing mechanism for moving the movable plate,
An injection molding machine for a composite molded product , wherein injection compression molding is performed in a cavity formed between the intermediate mold and the fixed mold. The lock mechanism is a combination of a servo motor that also serves as a moving mechanism for the intermediate member, a ball screw, and a ball screw nut.
2. The injection molding machine for a composite molded product according to claim 1, wherein the mold opening / closing mechanism for moving the movable plate toward the fixed plate is also a combination of a servo motor, a ball screw and a ball screw nut . An intermediate member is movably disposed in the mold opening / closing direction between the movable platen to which the movable mold is attached and the fixed platen to which the fixed die is attached, and the intermediate member rotates in a direction orthogonal to the mold opening / closing direction. In an operation method of an injection molding machine for a composite molded article, in which an intermediate mold that rotates about an axis is provided, and the movable mold and the fixed mold and the intermediate mold are closed to form cavities, respectively.
Between the intermediate member and the movable platen, at least two or more locking mechanisms that can hold the position of the intermediate member fixedly with respect to the movable platen are provided,
The intermediate member is fixedly held with respect to the movable platen by the lock mechanism,
The intermediate mold attached to the intermediate member is moved together with the movable plate to the fixed die attached to the fixed plate by the operation of the mold clamping cylinder provided separately from the mold opening / closing mechanism for moving the movable plate ,
An operation method of an injection molding machine for a composite molded article , wherein injection compression molding is performed in a cavity formed between the intermediate mold and the fixed mold .