JP2012218366A - Rotary die supporting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary die supporting device capable of reducing additional modification when a single-layer molding injection molding machine is diverted to a multilayer molding injection molding machine.SOLUTION: This rotary die supporting device 10 includes: a first support block 12 arranged between a fixed platen 5 and a movable platen 6 of an injection molding machine 1, and arranged movably in a die opening/closing direction by a first guide part 9; a first die mounting part 11 fixed at one end of a first rotary shaft 13 penetrating the first support block 12 in the vertical direction; and a rotary die drive mechanism 14 which is composed of two extensible actuators 14a, 14b, and in which respective one-side ends thereof are connected symmetrically with respect to a rotational center line of the first rotary shaft 13, the respective other-side ends thereof are rotatably connected to either of the fixed platen 5 and the movable platen 6 symmetrically with respect to the center line of the fixed platen 5 and the movable platen 6, and the two actuators 14a, 14b are arranged to slide respectively on horizontal surfaces different from each other.

Description

  The present invention relates to an injection molding machine that forms a multilayer molded article using a rotating die that is disposed between a fixed platen and a movable platen and combined with a die attached to at least one of the fixed platen and the movable platen. The present invention relates to a rotating mold support device.

  Various molding methods such as those characterized by molding equipment or molding dies as molding methods for multilayer molded products consisting of various combinations of different materials, same materials, different colors, and same colors in resin molded products It has been known. One of them is a molding method in which a multilayer molded product is molded using a fixed mold, a movable mold, and a set of molds composed of a rotating mold rotated between the fixed mold and the movable mold. .

  Patent Document 1 discloses a mold including a fixed mold (fixed mold), a movable mold (movable mold), and a rotating mold (rotating mold portion) that rotates between the fixed mold and the movable mold. An injection molding machine for molding a multi-material molded product (multilayer molded product) using a first injection device (injection unit) for injecting a molten material in contact with the fixed mold, and in contact with the movable mold A second injection device for injecting the molten material, a rotation type support device (rotary mold support device) for supporting the rotation type from a fixed plate so as to be rotatable and movable in a moving direction of the movable type; There is disclosed a multi-material injection molding machine comprising a fixed mold and a compression means (mold opening / closing device) for compressing the movable mold via a moving mold.

  In Patent Document 2, a module frame configured to be attachable to a machine bed (machine base portion) of a horizontal injection molding machine, a base plate (first support block), and a turntable (first support) rotatably supported by the base plate. And a rotating device (rotating die support device) of a horizontal injection molding machine in which the base plate is movably supported by a module frame.

  In addition, the parentheses in the descriptions regarding the above-mentioned Patent Document 1 and Patent Document 2 describe the constituent requirements of the present invention that are considered to be equivalent to or similar to the constituent requirements immediately before the parentheses so that the understanding of the present invention is easy. Therefore, it does not suggest that the constituent requirements immediately before the parenthesis and the constituent requirements in the parenthesis match.

JP 2006-168223 A US Pat. No. 6,824,381

  The multi-material injection molding machine of Patent Document 1 is described as having a simple configuration and easy to remodel based on a general-purpose injection molding machine. In addition, since all the mechanisms that rotate the rotation type around the vertical axis are attached to the fixed platen, these mechanisms become complicated, and all the loads and moments of these mechanisms including the rotation type are supported by the fixed platen. It is difficult to say that additional modifications are easy based on a general-purpose injection molding machine.

  In addition, in the rotating device of the horizontal injection molding machine of Patent Document 2, when the rotating device is directly attached to the machine bed, it is necessary to modify existing components (the end of the second paragraph of "BACKGROUND OF THE INVENTION") 5), the rotating device is not directly attached to the machine bed, but all the components are supported and arranged on the module frame, and the module frame is attached to the machine bed as a single unit. ). However, a fixed plate, a movable plate, and a mold opening / closing mechanism for moving the movable plate in the mold opening / closing direction are also mounted on the module frame (FIG. 1 and FIG. 2, the second paragraph of “SUMMARY OF THE INVENTION”, etc.) Therefore, when the module frame is attached to the machine base, it is necessary to remove the entire mold opening / closing mechanism including the fixed platen, the movable platen, and the tie bar from the machine base. (Described in the eighth paragraph, etc. of "DETAILLED DESCRIPTION OF PREFERRED EMBODIMENT")

  In addition, after the module unit is installed, the position of the fixed platen, movable platen, and mold opening / closing mechanism as a whole is increased by the height of the module unit. Description). However, due to the change, the injection position and the product handling position also become higher, so the entire existing injection unit is changed with a spacer etc. to raise the mounting position, the resin material supply line to the injection unit, the product take-out device, In addition, there is no description about the necessity of changing all production lines before and after being restricted by the height of existing injection molding machines, such as a conveyance line to the post-process of the taken out product.

  As a result, even if the rotation device (module frame) itself can be easily attached, a mold opening / closing device including a fixed platen, a movable platen, and a tie bar for mounting the module frame unitized as a rotation device, etc. It is necessary to remove the large members, and to remove the piping and wiring related to these large components. After the module frame is attached, it is of course necessary to reattach these large members and restore the related piping / wiring, and readjust the mold opening / closing operation of the mold opening / closing device after restoration. And, as mentioned above, the position of the fixed platen, the movable platen and the mold opening / closing mechanism as a whole is increased by the height of the module unit. There is a problem that the amount of the entire additional remodeling increases.

  The present invention has been made in view of the above-described problems. Specifically, when a single-layer molding injection molding machine is diverted to a multilayer molding injection molding machine, the invention is directed to a single-layer injection molding machine. An object of the present invention is to provide a rotating mold support device that can reduce the additional remodeling.

According to the first aspect of the present invention, the first support block is disposed between the fixed platen and the movable platen of the injection molding machine and is movably provided in the mold opening / closing direction by the first guide portion. When,
A first mold mounting portion fixed to one end of a first rotating shaft penetrating the first support block in the vertical direction;
Consists of two extendable actuators,
Each one end is connected to the other end of the first rotating shaft so as to be rotatable symmetrically with respect to the rotation center line of the first rotating shaft,
Each other end is rotatably connected to one of the fixed plate and the movable plate in a symmetrical manner with respect to the center line of the fixed plate and the movable plate, and the two actuators are different from each other. A rotating mold drive mechanism arranged to slide on a horizontal plane;
It is achieved by a rotating mold support device with

  That is, the rotary mold support device includes a first guide part, a first support block having a first mold mounting part fixed to the first rotary shaft, and a two-extensible actuator. Since it is composed of the three basic members of the drive mechanism, there are few members to be added by remodeling, and additional remodeling to the single-layer injection molding machine can be reduced. Further, as will be described later, the first mold mounting portion to which the rotating mold portion is mounted is moved in the mold opening / closing direction by expanding and contracting the two actuators of the rotating mold driving mechanism in the same direction, thereby moving the two actuators. It can be expanded and contracted and rotated at an arbitrary position. That is, since the rotational mold part can be moved and rotated in the mold opening / closing direction only by the rotational mold drive mechanism, there is no need to add a separate drive mechanism for the movement and rotational operation.

  Next, as shown in claim 2, the first guide part is a tie bar of an injection molding machine, and the first support block is guided in the mold opening / closing direction only upward from the center of the tie bar. It is preferable that it is a rotary mold support device according to claim 1.

  If the first guide part is a tie bar of an injection molding machine, the first guide part has sufficient rigidity and accuracy as guide means in the mold opening / closing direction and is one of the members constituting the rotary mold support device. Need not be added to the machine base or the like as a separate member. In addition, since the first support block is guided only from above the center of the tie bar, between the fixed platen and the movable platen, without removing those members, the mold opening / closing mechanism including the tie bar, etc., from above the injection molding machine, The first support block can be easily placed on the tie bar.

  Next, as shown in Claim 3, the positioning mechanism of the said 1st metal mold | die attaching part with respect to the said 1st support block was provided, The any one of Claims 1-2 characterized by the above-mentioned. It may be a rotating mold support device.

  If the rotational position of the first mold mounting part is accurately positioned by the positioning mechanism with respect to the first support block guided in the mold opening / closing direction by the first guide part, the two actuators of the rotary mold drive mechanism Even when the control accuracy of the movement operation and rotation operation in the mold opening and closing direction performed in step 1 is not high, the mold dividing surface of the rotating mold part attached to the first mold attaching part and the mold attached to the fixed platen and the movable platen Parallelism required when the mold is opened and closed with the mold mounting surface of the mold can be ensured.

Next, as shown in claim 4, a second support block disposed so as to overlap the first support block in the vertical direction;
A second mold mounting portion fixed to one end of a second rotating shaft penetrating the second support block in the vertical direction;
At least one connection block for integrating the first support block and the second support block in a vertical direction;
The rotating die support apparatus according to any one of claims 1 to 3 may be provided.

  The second mold mounting portion of the second support block arranged so as to overlap the first support block in the vertical direction and the first mold mounting portion of the first support block, and the rotating mold portion is above the vertical direction. And if it is rotationally supported by the downward direction, the rotation operation | movement of a rotation metal mold | die part can be stabilized more compared with the rotation support of any one. Further, if the second support block is integrated with the first support block in the vertical direction by at least one connection block, the second support block is integrated with the first support block by the rotating mold driving mechanism. It is not necessary to add a driving means for moving the second support block in the mold opening / closing direction as a separate member.

  Next, as shown in claim 5, the second support block is disposed on a tie bar of an injection molding machine, guided only in the upper direction from the center of the tie bar in the mold opening / closing direction, and the second rotating shaft is positioned in the vertical direction. The rotary mold support apparatus according to claim 4, wherein the rotary mold support apparatus is provided so as to be slidable at a fixed amount.

  If the second support block is disposed vertically above the first support block and on the upper tie bar of the injection molding machine, the mold due to the overturning moment of the rotating mold part loaded on the first support block when the mold is opened and closed. The overturning force in the opening / closing direction can be reduced. Further, if the second support block is disposed vertically below the first support block and on the lower tie bar of the injection molding machine, the run-out moment of the rotating mold part loaded on the first support block when the mold is opened and closed. The run-out force in the mold opening / closing direction due to can be reduced. Further, since the second support block is guided only upward from the center of the tie bar, the second support block can be guided from above the injection molding machine without removing the mold opening / closing mechanism including these members and tie bars between the fixed platen and the movable platen. The support block can be easily placed on the tie bar.

  Further, since the second rotation shaft is provided so as to be slidable by a predetermined amount in the vertical direction, the second support block will be described later regardless of whether the second support block is disposed above or below the first support block in the vertical direction. As described above, the mold can be exchanged from above the injection molding machine.

  If it is such a rotary mold support apparatus, as shown in Claim 6, the rotary mold part which has two mold division surfaces attached to the 1st mold mounting part is used as the rotary mold. The two actuators of the drive mechanism are expanded and contracted in the same direction and moved in the mold opening / closing direction, and the two actuators are expanded and contracted and rotated at an arbitrary position. Multi-layer molding can be performed by an injection molding machine to which the rotary mold support device described in item 1 is attached.

  According to a seventh aspect of the present invention, the axial center of the first rotating shaft of the first support block is aligned with the axial center of the second rotating shaft of the second support block in the vertical direction. The first support block and the second support block are integrated in the vertical direction by at least one of the connection blocks, and the rotating mold is formed by the first mold mounting portion and the second mold mounting portion. It may be an injection molding machine to which the rotary mold support device according to any one of claims 4 to 6 is attached, wherein the portion is rotationally supported above and below the vertical direction.

  With such an injection molding machine, the rotational operation of the rotating mold part can be more stabilized during multi-layer molding, and also due to the overturning moment of the rotating mold part loaded on the first support block when the mold is opened and closed. It is possible to reduce the swinging force in the mold opening / closing direction due to the overturning force and the swinging moment in the mold opening / closing direction, and to stabilize the movement operation of the rotating mold part in the mold opening / closing direction.

  According to another aspect of the present invention, there is provided a rotating mold part having two mold dividing surfaces attached to the first mold attaching part to extend and contract the two actuators of the rotating mold drive mechanism. When rotating at an arbitrary position, one of the actuators is allowed to expand and contract at a position where the expansion / contraction operation of one of the actuators is switched, and is rotated only by the expansion / contraction operation of the other actuator. The injection molding machine according to any one of claims 6 to 7 may be used.

  As will be described later, when the two mold actuators are extended and contracted to rotate the rotary mold part at an arbitrary position, the switching positions of the two actuators do not overlap. Therefore, rather than performing active switching control of the expansion / contraction operation, the actuator can be made to expand and contract at a position where the expansion / contraction operation of one actuator can be switched, and rotated only by the expansion / contraction operation of the other actuator. However, the rotational operation can be made more stable.

A rotary mold support device according to the present invention is disposed between a fixed plate and a movable plate of an injection molding machine, and a first support block provided so as to be movable in a mold opening and closing direction by a first guide part;
A first mold mounting portion fixed to one end of a first rotating shaft penetrating the first support block in the vertical direction;
Consists of two extendable actuators,
Each one end is connected to the other end of the first rotating shaft so as to be rotatable symmetrically with respect to the rotation center line of the first rotating shaft,
Each other end is rotatably connected to one of the fixed plate and the movable plate in a symmetrical manner with respect to the center line of the fixed plate and the movable plate, and the two actuators are different from each other. A rotating mold drive mechanism arranged to slide on a horizontal plane;
When the single-layer molding injection molding machine is diverted to the multilayer molding injection molding machine, additional modifications to the single-layer injection molding machine can be reduced.

It is the schematic of the injection molding machine using the rotary die support apparatus which concerns on Example 1 of this invention. It is the schematic of the rotary die drive means of the rotary die support apparatus which concerns on Example 1 of this invention. It is the first half of operation | movement explanatory drawing of the rotary mold support apparatus which concerns on Example 1 of this invention. It is the operation | movement explanatory drawing latter half of the rotary die support apparatus which concerns on Example 1 of this invention. It is the schematic of the injection molding machine using the rotary die support apparatus which concerns on Example 2 of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view of an injection molding machine using a rotary mold support device according to Embodiment 1 of the present invention. Fig.1 (a) is a schematic side view, FIG.1 (b) is a schematic front view in the AA arrow view of Fig.1 (a). FIG. 2 is a schematic view of a rotating mold driving unit of the rotating mold support apparatus according to the first embodiment of the present invention. 2A is a schematic plan view taken along the line BB in FIG. 1, and FIG. 2B is a schematic side view taken along the line CC in FIG. 2A. 3 (a) to 3 (d) are diagrams illustrating the operation of the rotating mold support device according to the first embodiment of the present invention, and FIGS. 4 (a) to 4 (d) are illustrated in the first embodiment of the present invention. It is the operation | movement explanatory drawing latter half of such a rotary die support apparatus.

  First, an outline of the rotary mold support device 10 and the injection molding machine 1 to which the rotary mold support device 10 is attached will be described. As shown in FIG. 1A, the stationary platen 5 to which the stationary mold 20 is attached is fixed to the machine base portion 8. The movable platen 6 to which the movable mold 40 is attached so as to face the fixed platen 5 is guided by the tie bars 9 extended from the four corners of the fixed platen 5 and is opened and closed by the mold opening / closing device 7 that can also clamp the mold. It is arranged on the machine base 8 so as to be movable in the direction. In addition, on the back side of the fixed plate 5 to which the fixed mold 20 is attached, the injection unit 4 is arranged on the machine base portion 8 so that it can be injected into the fixed mold 5 through a through hole of the fixed plate 5 (not shown). Has been. A rotating mold support device 10 is disposed between the fixed platen 5 and the movable platen 6 facing each other. The rotary mold part 30 supported by the rotary mold support device 10 is attached to the rotary mold mounting plate 31 so as to face the rotary mold mounting plate 31, the fixed platen 5 and the movable platen 6. The rotating mold part 30 is configured to be detachably attached to the first mold attaching part 11 of the rotating mold supporting device 10 via the rotating mold attaching board 31. It has been.

  The rotary mold mounting plate 31, the first rotary die 32 and the second rotary die 33 are a single die (rotary die) having two mold dividing surfaces facing the fixed platen 5 and the movable platen 6. It may be configured as a mold part 30) and may be detachably attached to the first mold attachment part 11. Further, the rotating mold part 30 may be configured to be rotatably supported around a horizontal rotation axis orthogonal to the mold opening / closing direction. Here, when the single-layer molding injection molding machine is diverted to the multilayer molding injection molding machine, it is generally necessary to add a new injection unit separately from the existing injection unit 4. Such additional injection units are available in various specifications, and the specifications of such additional injection units, molds for injection filling, or for injection filling into the molds. Since the arrangement form and the like are matters that should be appropriately selected according to the specifications of the multilayer molded product or the multilayer molding method, description of the additional injection unit and description in the drawing are omitted.

  Next, the configuration of the rotary mold support device 10 will be described. As shown in FIG. 1 (b), the rotary mold support apparatus 10 is guided in the mold opening / closing direction only upward from the center of each tie bar, with the lower two tie bars 9 of the injection molding machine as the first guide portions. A first support block 12 that supports the load on the machine base portion 8 through a support roller 17 is provided. The support roller 17 may be another known support structure that reduces sliding resistance. And the 1st rotating shaft 13 is arrange | positioned so that the 1st support block 12 may be penetrated, and the 1st metal mold | die attaching part 11 is fixed to the end of the 1st rotating shaft 13, and a perpendicular direction upper direction in this case. The block 12 is rotatably supported.

  Similarly, at the other end of the first rotating shaft 13, in this case, vertically below, one end of each actuator of the rotary mold drive mechanism 14 composed of two extendable actuators 14a and 14b, such as a hydraulic cylinder, In this case, the rod side is rotatably connected symmetrically with respect to the rotation center line of the first rotation shaft 13. A positioning mechanism 15 that positions the first mold mounting portion 11 with respect to the first support block 12 is disposed on the first support block 12 symmetrically with respect to the rotation center line of the first rotation shaft 13. The positioning mechanism 15 is configured to extend and contract the tip of the actuator so that the tip is inserted into the positioning hole provided in the lower surface of the first mold mounting portion 11. However, if the required positioning accuracy is obtained. Another known mechanism may be used.

  In this way, the rotary mold part 30 is rotatably supported by the first support block 12, and the lower two tie bars 9 of the injection molding machine are used as the first guide parts, and the mold opening / closing direction only from the center to the upper side. In order to guide the first support block 12 between the fixed plate 5 and the movable plate 6 without removing those members, a mold opening / closing mechanism including a tie bar, etc., from above the injection molding machine. Can be placed on the tie bar.

  Specifically, the longitudinal direction of the first support block 12 lifted by an overhead crane or the like is matched with the mold opening / closing direction, and after being lowered between the upper tie bars between the fixed platen 5 and the movable platen 6, The support block 12 may be rotated so that the longitudinal direction of the support block 12 and the mold opening / closing direction are orthogonal to each other, and further lowered. If at least one of the upper tie bars is provided with a tie bar removing mechanism, the arrangement of the first support block 12 on the lower tie bar is further facilitated. In addition, since most of the load of the entire first support block 12 (rotary mold support device 10) including the rotary mold part 30 is supported by the machine base part 8 via the support structure such as the support roller 17, There is no possibility that an unnecessary bending load is generated on the lower two tie bars 9.

  Here, the guide in the mold opening / closing direction of the first support block 12 is necessary only above the center of each of the two lower tie bars 9 because the load of the first support block 12 including the rotating mold portion 30 is sufficiently heavy. However, it is preferable that the fall prevention member 18 is attached below the lower two tie bars 9 in case an excessive fall moment occurs. In the first embodiment, the two lower tie bars 9 that guide the first support block 12 in the mold opening / closing direction are used as the first guide portion. In addition to the tie bar 9, a known guide member such as a linear motion guide member that replaces the support roller 17 may be provided in the machine base portion 8 or the like as the first guide portion. Furthermore, in the first embodiment, the first support block 12 is disposed on the lower tie bar, and the rotating mold part 30 is rotatably supported above the first support block 12, but the first support block 12 is the upper part. A configuration is also possible in which the rotating mold part 30 is rotatably supported below the first support block 12 in the vertical direction by being arranged on the tie bar.

  Next, FIG. 2 shows the arrangement of the rotary mold drive mechanism 14 described above. As described above, the rod side of each actuator of the rotary mold drive mechanism 14 composed of the two extendable actuators 14a and 14b is connected to the lower side in the vertical direction of the first rotary shaft 13. The other end of the actuator, in this case, the head side is connected to the lower side of the die mounting surface of the fixed platen 5 so as to be rotatable similarly to the rod side. The two actuators 14a and 14b of the rotary mold drive mechanism 14 are arranged so as to slide on different horizontal planes. Here, an actuator that slides on the horizontal plane above the vertical direction (the lower side in FIG. 2 (a), the front side in FIG. 2 (b)) is the actuator 14a, and an actuator that slides on the horizontal plane below the vertical direction (FIG. 2). (A) Upper side, FIG. 2 (b) rear side) is an actuator 14b. As will be described later, the rotary mold part 30 is moved in the mold opening and closing direction by expanding and contracting these two actuators 14a and 14b in the same direction, and extending and contracting these two actuators 14a and 14b to any position. Can be rotated. In other words, since the rotary mold part 30 can be moved and rotated in the mold opening / closing direction only by the rotary mold drive mechanism 14, it is not necessary to separately add a drive mechanism for moving and rotating operation. Although not shown, in order to rotatably connect the head side of these two actuators below the die mounting surface of the fixed platen 5, the lower two tie bars 9 and the fixed plate 6 are attached to the die. If there is a mounting bracket capable of positioning the head side positions of these two actuators by using the surface, it becomes easy to add the rotary mold drive mechanism 14.

  Here, since the first support block 12 is guided in the mold opening / closing direction by the lower two tie bars 9 as the first guide portions with approximately the same accuracy as the movable plate 6, If the rotational position of the first mold mounting portion 11 is positioned with a predetermined accuracy by the positioning mechanism 15, the movement operation in the mold opening / closing direction performed by the two actuators 14 a and 14 b of the rotary mold driving mechanism 14 and Even if the control accuracy of the rotational operation is not high, the mold dividing surface of the rotating mold part 30 attached to the first mold attaching part 11 and the mold attaching surface of the mold attached to the fixed platen 5 and the movable platen 6 The parallelism required when the mold is opened and closed can be ensured. That is, since these two actuators 14a and 14b and their control do not require high-precision operation control, a combination of a general-purpose actuator such as a hydraulic cylinder and a general-purpose solenoid valve is inexpensive and highly versatile. Thus, the moving operation and the rotating operation of the rotating mold part 30 in the mold opening / closing direction can be controlled.

  As described above, the rotary mold support device 10 is composed of the three basic members of the first guide portion, the first support block 12, and the rotary mold drive mechanism 14, so that there are few members to be added by remodeling. Further, it is possible to reduce additional modifications to the single-layer injection molding machine. In the first embodiment, since the lower two tie bars 9 are used as the first guide portion, the rotating die support device 10 is configured by two substantially smaller basic members. Next, since the moving and rotating operation of the rotating mold part in the mold opening / closing direction can be performed only by the rotating mold driving mechanism 14, it is not necessary to separately add a driving mechanism for moving and rotating operation. For the same reason, the structure of the first support block 12 can be simplified. Furthermore, in the attachment of these members, it is basically unnecessary to remove the existing components of the injection molding machine, so unnecessary work relating to the existing components does not occur, and the positional relationship of the existing components changes. Therefore, unlike the rotating device of Patent Document 2, there is no need to change the production line before and after being restricted by the height of an existing injection molding machine.

  Next, the operation of the rotary mold support device 10 according to the multilayer molding process according to the first embodiment of the present invention will be described with reference to FIGS. 3 and 4. 3 and 4 are plan views illustrating the outline of main components for explaining the operation of the rotary mold support apparatus 10. FIG. The vertical relationship of each component shall be the same as in FIGS.

  FIG. 3A shows a state in which mold filling is started after injection filling of the primary molding and the secondary molding, and cooling and solidification of the primary molded product and the secondary molded product in the mold cavity are completed. Specifically, in the previous cycle, in the mold cavity formed by the fixed mold 20 and the first rotary mold 32, primary molding is performed in which the primary molded product is molded, and the second rotary mold is formed. In the mold cavity formed by the movable mold 40 and the movable mold 40, it is assumed that the secondary molding is performed in which the primary molded product held on the second rotating mold 33 side is laminated.

  As shown in FIG. 3A, the rotational position of the first mold mounting portion 11 to which the rotating mold portion 30 is attached to the first support block 12 (not shown) (hereinafter, the rotation of the rotating mold portion 30 is performed). Position) is positioned by the positioning mechanism 15. A black circle indicating the positioning mechanism 15 in the drawing indicates that the mechanism is in an operating state. First, the movable mold 40 attached to the movable platen 6 (not shown) is opened from the second rotary mold 33 of the rotary mold unit 30 by the mold opening / closing device 7 (not shown). Although not shown, a multilayer molded product that is secondarily molded in the previous cycle is held on the second rotating mold 33 side.

  Next, as shown in FIG. 3B, the two actuators 14a and 14b of the rotary mold drive mechanism 14 are extended in the same direction simultaneously with the opening of the movable mold 40 or after a predetermined time has elapsed. Then, the rotating mold part 30 is opened. Specifically, a predetermined amount of driving medium such as hydraulic oil is supplied to each head side of the two actuators 14a and 14b with a predetermined pressure. When the rods of the two actuators extend and the first support block 12 guided by the two lower tie bars 9 is moved to the mold opening side via the first rotating shaft 13 to which the rods are connected, The first rotating mold 32 of the mold unit 30 is opened from the fixed mold 20 attached to the fixed platen 5 (not shown).

  Since the positioning mechanism 15 is in the operating state, the rotary mold part 30 is fixed to the first support block 12, and the first actuator block 12 can be operated without completely synchronizing the extension speed and extension force of the rods of the two actuators. The 1st rotating shaft 13 does not rotate, but the metal mold | die division surface of the metal mold | die facing the metal mold | die dividing surface of the rotation mold part 30 attached to the 1st metal mold | die attaching part 11 of the perpendicular direction upper direction of the 1st rotating shaft 13 The mold is opened while maintaining the parallelism with the guide, and unnecessary load on the guide pins and guide pin holes to ensure the accuracy of mold alignment between the molds, damage to the guide pins and guide pin holes due to such loads, etc. Can be prevented. On the first rotating mold 32 side, a primary molded product that is primarily molded in the previous cycle is held.

  Next, as shown in FIG. 3C, after the movable mold 40 reaches the maximum mold opening position and the rotating mold portion 30 reaches an arbitrary position for rotating the mold, the second rotating mold 33 side is reached. A multi-layer molded product (not shown) held in the mold is carried out of the mold by a product take-out device (not shown). Until the multilayer molded article is carried out of the mold, the positioning mechanism 15 maintains the operating state. Thereafter, at the same arbitrary position, the two actuators 14a and 14b of the rotary mold drive mechanism 14 were expanded and contracted, and the primary molded product that was primarily molded in the previous cycle was held on the first rotary mold 32 side. The rotating mold part 30 is rotated 180 degrees counterclockwise.

  Specifically, after the positioning mechanism 15 is released, the actuator 14a of the rotary mold drive mechanism 14 is contracted until just before the rod tip position 24a reaches the rod tip position 25a that is the minimum stroke point. Further, the actuator 14b is extended until the rod tip position 24b reaches the rod tip position 25b that is a position symmetrical to the rotation center of the rod tip position 25a of the actuator 14a. The rotating mold part attached to the first mold attaching part 11 vertically above the first rotating shaft 13 by rotating the first rotating shaft 13 counterclockwise by synchronizing the contraction and extension of these two actuators. 30 is rotated counterclockwise.

  The contraction and extension of these two actuators can suppress the difference in the speed and force of these actuators within a predetermined range in order to prevent damage to the actuator main body and the connecting portions at both ends, or to increase the life of the rotation support structural member. Although the accuracy of the rotation operation of the rotary mold part 30 is preferably ensured by the mechanical rotation support structure of the first rotation shaft 13, the control accuracy (rotation speed maintenance, rotation acceleration control, etc.) of the rotation operation is highly accurate. There is no need to tune it completely because it is not necessary.

  Next, as shown in FIG. 3D, the supply of the drive medium to the rod side of the actuator 14a is stopped before the rod tip position of the actuator 14a passes the rod tip position 25a that is the minimum stroke point. At the same time, the drive medium on the rod side and the head side is allowed to enter and exit freely. On the other hand, the extension of the actuator 14b is continued before and after the rod tip position passes the rod tip position 25b.

  This is because, when the rod tip of the actuator 14a passes the rod tip position 25a which is the minimum stroke point of the actuator 14a, that is, the switching point from the contraction to the extension of the actuator 14a, the actuator 14a is instantaneously moved from the contraction to the extension. Rather than performing switching control, the expansion and contraction of the actuator 14a is not controlled before and after passing through the rod tip position 25a, but can be expanded and contracted by an external force, and only the external force due to the extension operation of the actuator 14b is used. This is because the rotation operation can be stabilized when the rotation operation is performed.

  Since the rod tip position of the actuator 14b does not reach the maximum stroke point at the rod tip position 25b, the actuator 14b can continue the extension operation before and after passing through the rod tip position 25b. When the rod tip position passes through the rod tip position 25a and the actuator 14a is switched from the contraction operation to the full extension operation by the rotation operation of the actuator 14b, the actuator 14a positively supplies the pressure medium to the head side. Transition to a typical stretching operation.

  The switching control of the contraction / extension may be controlled by a plurality of sensors that can be attached to the actuator, for example, a cylinder switch or the like at an appropriate switching position. In addition, the rotational position (state) of the rotating mold part 30 can be constantly monitored by a sensor capable of detecting and monitoring the rotational position, such as a rotary encoder, and the rotational position information can be used for controlling the rotational operation of the actuators 14a and 14b. In this case, the rotation operation can be further stabilized.

  FIG. 4A shows a state in which the rotating mold part 30 is rotated 90 degrees counterclockwise from the state of FIG. In this state, the rod tip position 26a of the actuator 14a has already passed the rod tip position 25a that is the minimum stroke point, and the actuator 14a can continue the extension operation before and after passing through the rod tip position 26a. . Further, the rod tip position 26b of the actuator 14b in this state does not reach the rod tip position 27b that is the maximum stroke point, and the actuator 14b can continue the extending operation before and after passing through the rod tip position 26b. It is. The rod tip position 26a and the rod tip position 26b are in a positional relationship that is symmetrical with respect to the rotation center, and the rod tip of the actuator 14a is in a positional relationship that is symmetrical with respect to the rod tip position 27b that is the maximum stroke point of the actuator 14b. This is the tip position 27a.

  Next, as shown in FIG. 4B, before the rod tip position of the actuator 14b passes the rod tip position 27b which is the maximum stroke point, supply of the drive medium to the head side of the actuator 14b is stopped. At the same time, the drive medium on the head side and the rod side is allowed to enter and exit freely. On the other hand, the extension of the actuator 14a is continued before and after the rod tip position passes the rod tip position 27a. This is because when the rod tip of the actuator 14b passes the rod tip position 27b, which is the switching point from the extension to the contraction of the actuator 14b, when the rod tip position 27b of the actuator 14b passes, the external force is not controlled. The rotating die 30 is rotated only by an external force generated by the extension operation of the actuator 14a, and the rod tip of the actuator 14a described above is switched from contraction to extension. This is the same control as when passing through the rod tip position 25a, which is a point.

  Since the rod tip position of the actuator 14a does not reach the maximum stroke point at the rod tip position 27a, the actuator 14a can continue to extend before and after passing through the rod tip position 27a. When the rod tip position passes through the rod tip position 27b and the actuator 14b is switched from the extension operation to the contraction operation completely by the rotation operation of the actuator 14a, the actuator 14b positively supplies the pressure medium to the rod side. Shift to a normal contraction action.

  Subsequently, the rotating mold part 30 is rotated counterclockwise, and as shown in FIG. 4C, the rotating mold part 30 is rotated 180 degrees from the state of FIG. Specifically, the rod tip position of the actuator 14a is at the rod tip position 28a (same position as the rod tip position 24b), and the rod tip position of the actuator 14b is at the rod tip position 28b (same position as the rod tip position 24a). To reach. Before the rod tips of the two actuators reach their respective positions, the extension speed and extension force of the respective actuators are sufficiently reduced, and finally the positioning mechanism 15 is operated to rotate the rotary mold part 30. Position the position. Nothing is held on the second rotating mold 33 side rotated to the position facing the fixed mold 20, and no rotation is held on the first rotating mold 32 side rotated to the position facing the movable mold 40. Although not shown, the primary molded product that has been primary molded in the previous cycle is held.

  Next, as shown in FIG. 4D, after the positioning mechanism 15 is operated to position the rotational position of the rotary mold part 30, the movable mold 40 is rotated by the mold opening / closing device (not shown). The mold is closed to the first rotating mold 32 side where the primary molded product that has been primarily molded in the previous cycle of the mold unit 30 is held. In addition, a predetermined amount of driving medium such as hydraulic oil is supplied to each of the rods of the two actuators 14a and 14b at a predetermined pressure, and the rods of the two actuators are contracted in the same direction, so The rotary mold 33 is closed to the fixed mold 20 side. Since the movable mold 40 and the rotating mold part 30 can be moved independently in the mold opening / closing direction, the optimum mold closing operation such as the timing of closing the mold, the mold closing speed, etc. can be selected as appropriate. good.

  3A to 4D, the rotating mold part 30 can be moved in the mold opening / closing direction and continuously rotated counterclockwise by 180 degrees at an arbitrary position. . The rod side and head side of each of the two actuators 14a and 14b are both connected symmetrically with respect to the rotation center line of the first rotating shaft 13 and the center line of the fixed platen 5, so this step is performed. If the process is reversed as shown in FIG. 4 (d) to FIG. 3 (a), the rotating mold part 30 can be moved in the mold opening / closing direction and continuously rotated clockwise by 180 degrees at an arbitrary position. . That is, the multilayer molded product can be continuously formed by alternately changing the rotation direction in the rotation operation of the rotating mold part 30 between the counterclockwise direction and the clockwise direction for each mold opening. The two actuators 14a and 14b are in an intersecting state in order to rotate the rotary mold part 30, but since these two actuators are arranged so as to slide on different horizontal planes, there is no problem in the rotational operation. .

  A second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a schematic view of an injection molding machine using a rotary mold support device according to Embodiment 2 of the present invention. A specific difference between the second embodiment and the first embodiment is the addition of a second support block and a connection block. Other configurations of the rotating mold support device and the multilayer molding method are basically the same as those in the first embodiment. Therefore, the same constituent elements in FIG. 5 are denoted by the same reference numerals, and only differences from the first embodiment will be described. .

  As shown in FIG. 5, the second support block 112 is disposed on the upper two tie bars 9. Like the first support block 12, the second support block 112 is configured to be guided in the mold opening / closing direction only upward from the center of each tie bar. Further, it is possible to easily dispose these members, the mold opening / closing mechanism including the tie bar, and the like on the upper tie bar from above the injection molding machine. And the 2nd rotating shaft 113 is arrange | positioned so that the 2nd support block 112 may be penetrated, and the 2nd metal mold | die attaching part 111 is fixed to one end of the 2nd rotating shaft 113 in this case, a perpendicular direction downward, and 2nd support The block 112 is rotatably supported and is slidable by a predetermined amount in the vertical direction. The second support block 112 is located above the first support block 12 in the vertical direction so that the axis of the second rotation shaft 113 and the axis of the first rotation shaft 13 of the first support block 12 coincide with each other in the vertical direction. Placed in.

  The first support block 12 and the second support block 112 are integrated in the vertical direction at both ends by two connection blocks 119a and 119b. If necessary, these connection blocks 119a and 119b can be removed to release the integration. The connection block 119 a and 119 b and the first support block 12 and the second support block 112 are fixed to the first rotation shaft 13 of the first support block 12 and the second rotation shaft 113 of the second support block 112. Needless to say, a known positioning structure such as an inlay structure capable of positioning in the vertical direction and the mold opening / closing direction is adopted so that the axial center of the shaft can be aligned with the vertical direction. In the second embodiment, the second support block 112 is arranged on the upper tie bar. However, the second support block 112 may be supported only by the connection blocks 119a and 119b.

  The vertical inlay structure as shown in FIG. 5B can prevent the load of the second support block 112 from being directly applied to the upper two tie bars. Similar to the first support block 12, it is preferable that the fall prevention member 118 is attached below the upper two tie bars 9 in case an excessive fall moment occurs.

  In this manner, the second mold mounting portion 111 of the second support block 112 and the first mold mounting portion 11 of the first support block 12 disposed above the first support block 12 in the vertical direction are used to rotate the rotating mold. If the mold part 30 is rotationally supported above and below the vertical direction, the rotational operation of the rotary mold part 30 can be made more stable. Further, if the second support block 112 is integrated with the first support block 12 in the vertical direction by the connection blocks 119a and 119b, the second support block 112 is connected to the first support block 12 by the rotary mold driving mechanism 14. There is no need to add a driving means that is integrally moved in the mold opening / closing direction and moves the second support block 112 in the mold opening / closing direction as a separate member.

  Further, if the second support block 112 is disposed on the upper tie bar of the injection molding machine, the overturning force in the mold opening / closing direction due to the overturning moment of the rotating mold portion 30 loaded on the first support block 12 is reduced when the mold is opened / closed. Therefore, the moving operation of the rotating mold part 30 in the mold opening / closing direction can be further stabilized. Here, in the first embodiment, it has been described that the first support block 12 is disposed on the upper tie bar and the rotating mold part 30 is rotatably supported below the first support block 12. In this case, the second support block 112 only needs to be disposed on the lower tie bar of the injection molding machine. When the mold is opened and closed, the run-out force in the mold opening and closing direction due to the run-out moment of the rotating mold portion 30 loaded on the first support block 12 The rotational movement of the rotating mold part 30 in the mold opening / closing direction can be made more stable.

  Returning to the description of the second embodiment. As shown in FIG. 5, since the second rotating shaft 113 of the second support block 112 is provided to be slidable by a predetermined amount in the vertical direction, the second gold fixed to the lower side of the second rotating shaft 113 in the vertical direction. The first mounting block 111 and the second supporting block by the connecting blocks 119a and 119b are fixed by releasing the fixing of the mold attaching portion 111 and the rotating mold portion 30 and moving the mold mounting portion 111 in a direction away from the rotating mold portion. The integration with 112 is released. If the mold is closed in advance and the fixed mold 20 and the movable mold 40 are integrated with the rotary mold portion 30 by a known means, the rotary mold driving means 14 causes the first support block 12 and the rotary mold to be integrated. The part 30 is moved in the mold opening / closing direction, and is moved from the lower area of the second support block 112, so that the mold can be exchanged from above the injection molding machine. As described above, even if the second support block 112 is disposed above the rotating mold part 30, there is no problem in mold replacement.

  Further, by utilizing the fact that the second rotating shaft 113 is slidable by a predetermined amount in the vertical direction, the rotating mold part 30 and the second mold attaching part 111 are fixed, and the rotating mold part 30 is fixed. And the first mold mounting portion 11 are released. Thereafter, the second rotary shaft 113 is lifted slightly upward by an overhead crane or the like, and the first support block 12 and the first mold mounting portion 11 are moved from the lower region of the rotary mold portion 30 by the rotary mold drive mechanism 14. For example, without removing the rotating mold part 30 from between the fixed platen 5 and the movable platen 6, an attaching / detaching mechanism (not shown) with the rotating mold part 30 of the first mold attaching part 11, a positioning mechanism 15, etc. Maintenance or the like of the mechanism disposed in the lower region of the mold part 30 can be performed.

  Also in the second embodiment, the moving operation in the mold opening / closing direction of the rotating mold part 30 by the rotating mold driving mechanism 14 and the rotating operation at an arbitrary position are the same as those in the first embodiment. However, by adding the second support block 112 and the connection blocks 119a and 119b that integrate the second support block 112 with the first support block 12, the rotating operation of the rotating mold part 30 and the moving operation in the mold opening / closing direction can be performed. While making it more stable, maintenance of the rotating mold support apparatus 10 arrange | positioned downward from the rotating mold part 30 and the rotating mold part 30 can be made easy.

  Further, even if the first support block 12 described in the first embodiment is disposed on the upper tie bar and the rotating mold part 30 is rotatably supported below the first support block 12, the second support block 112 is used. If it is arrange | positioned on a lower tie bar, there can exist an effect similar to Example 2. FIG. In addition, it is possible to replace the mold from above the injection molding machine and facilitate maintenance of the rotary mold support device 10 in the same manner.

  When the second support block 112 is disposed vertically below the first support block 12, the rotary mold portion 30 is rotatably supported below the first support block 12. Sometimes, the deflection force in the mold opening and closing direction due to the deflection moment of the rotating mold part 30 loaded on the first support block 12 can be reduced.

  Regarding the mold replacement, the fixing between the rotating mold part 30 and the first mold attaching part 11 is released, the second mold attaching part 111 and the rotating mold part 30 are lowered, and the connection blocks 119a and 119b If the integration of the first support block 12 and the second support block 112 is released, only the first support block 12 is moved in the mold opening / closing direction by the rotating mold driving means 14, so It is possible to retreat and replace the mold from above the injection molding machine.

  For facilitating maintenance of the rotary mold support device 10, the fixing between the rotary mold part 30 and the first mold attachment part 11 is released, and the rotary mold part 30 and the second mold attachment part 111 are lowered. After that, if the first support block 12 is retracted from the upper region of the rotating mold part 30 by the rotating mold driving means 14, the rotating mold part 30 is not removed from between the fixed platen 5 and the movable platen 6, Maintenance and the like of a mechanism disposed in the upper area of the rotating mold part 30 such as an attaching / detaching mechanism (not shown) with the rotating mold part 30 of the first mold attaching part 11 and the positioning mechanism 15 can be performed.

  The present invention is not limited to the above embodiment and can be implemented in various forms. For example, in the first embodiment, the rod side of the two actuators 14a and 14b of the rotary mold drive mechanism 14 is connected to the first rotating shaft 13 side, and the head side is connected to the stationary platen 5 side. The head side may be reversed. In addition, the two actuators 14a and 14b are connected to the fixed platen 5 side with respect to the first rotary shaft 13, but a mode in which these actuators are connected to the movable platen 6 side with respect to the first rotary shaft 13 is also possible. It is.

  Next, in the second embodiment, the connection blocks 119a and 119b are adopted to integrate the first support block 12 and the second support block 112 in the vertical direction. If the second support block 112 can be integrated, even if the connection blocks 119a and 119b are integrated with one of the first support block 12 and the second support block 112, the connection blocks 119a and 119b. May be divided into two in the vertical direction and integrated with the first support block 12 and the second support block 112, respectively. In addition, even when the second support block 112 is disposed vertically below the first support block 12, the second support block 112 is not disposed on the lower tie bar, and is supported only by the connection blocks 119a and 119b. Is possible.

  As described above, when the single-layer molding injection molding machine is diverted to the multilayer molding injection molding machine, the rotary mold support device according to the present invention can reduce additional modifications to the injection molding machine. . In particular, the fact that a general-purpose single-layer injection molding machine can be easily remodeled into a multilayer injection molding machine by combining with a commercially available additional injection unit has the effect that it can be easily returned to a single-layer injection molding machine. In other words, it is not necessary to introduce an expensive injection molding machine dedicated to multilayer molding, and it becomes possible to use single-layer injection molding machines for single-layer molding and multi-layer molding at low cost according to demand. Industrial value is extremely high for manufacturers. In addition, even when designing and manufacturing a multi-layer molding injection molding machine, the design change from the general-purpose single-layer molding injection molding is limited, assuming the addition of the rotary mold support device according to the present invention. Since there are few and the members newly added are also few, the increase in these design and manufacturing costs can be suppressed. Therefore, the industrial utility value is extremely high not only for manufacturers of resin molded products but also manufacturers of injection molding machines.

DESCRIPTION OF SYMBOLS 1 Injection molding machine 5 Fixed board 6 Movable board 9 Tie bar 10 Rotating mold support apparatus 11 1st mold mounting part 12 1st support block 13 1st rotating shaft 14 Rotating mold drive mechanism 14a Actuator 14b Actuator 15 Positioning mechanism 20 Fixed Mold 30 Rotating mold part 40 Movable mold 111 Second mold mounting part 112 Second support block 113 Second rotating shaft

Claims (8)

A first support block disposed between the fixed plate and the movable plate of the injection molding machine and provided so as to be movable in the mold opening and closing direction by the first guide;
A first mold mounting portion fixed to one end of a first rotating shaft penetrating the first support block in the vertical direction;
Consists of two extendable actuators,
Each one end is connected to the other end of the first rotating shaft so as to be rotatable symmetrically with respect to the rotation center line of the first rotating shaft,
Each other end is rotatably connected to one of the fixed plate and the movable plate in a symmetrical manner with respect to the center line of the fixed plate and the movable plate, and the two actuators are different from each other. A rotating mold drive mechanism arranged to slide on a horizontal plane;
Rotating mold support device comprising:   2. The rotary mold support according to claim 1, wherein the first guide portion is a tie bar of an injection molding machine, and the first support block is guided in the mold opening / closing direction only upward from the center of the tie bar. apparatus.   The rotary mold support apparatus according to claim 1, further comprising a positioning mechanism for the first mold mounting portion with respect to the first support block. A second support block arranged to overlap the first support block in the vertical direction;
A second mold mounting portion fixed to one end of a second rotating shaft penetrating the second support block in the vertical direction;
At least one connection block for integrating the first support block and the second support block in a vertical direction;
The rotating die support apparatus according to any one of claims 1 to 3, further comprising:   The second support block is disposed on a tie bar of an injection molding machine, is guided in the mold opening / closing direction only upward from the center of the tie bar, and the second rotating shaft is provided to be slidable by a predetermined amount in the vertical direction. The rotating mold support apparatus according to claim 4.   The rotating mold part having two mold dividing surfaces attached to the first mold attaching part is moved in the mold opening and closing direction by expanding and contracting the two actuators of the rotating mold driving mechanism in the same direction. The injection molding machine to which the rotary mold support device according to any one of claims 1 to 3 is attached, wherein the two actuators are expanded and contracted and rotated at an arbitrary position.   The first support block and the second support block are positioned at a position where the axis of the first rotation axis of the first support block and the axis of the second rotation axis of the second support block coincide with each other in the vertical direction. A support block is integrated in the vertical direction by at least one of the connection blocks, and the rotating mold part is rotated in the vertical direction above and below by the first mold attaching part and the second mold attaching part. An injection molding machine to which the rotary mold support device according to any one of claims 4 to 6 is attached.   When rotating the rotating mold part having two mold dividing surfaces attached to the first mold attaching part by expanding and contracting the two actuators of the rotating mold driving mechanism, at an arbitrary position, 8. The method according to claim 6, wherein, at a position where the expansion / contraction operation of one of the actuators is switched, one of the actuators is allowed to expand / contract and is rotated only by the expansion / contraction operation of the other actuator. The injection molding machine according to claim 1.

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