JP2015139972A - Core drive unit and injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core drive unit capable of driving a core for compression from the central part of a mold in a well-balanced way.SOLUTION: A movable platen (2) includes a core drive unit (1) to which a movable-side mold (47) is fixed. The core drive unit (1) includes an electrically-driven motor (7) disposed on the side of the unit, a rotary shaft (44) disposed in parallel with a mold fitting surface (14), a pair of bevel gears (26 and 45) which changes the axis of rotation to a perpendicular direction, and a rotor (16) which is thereby rotated. The rotor (16) is housed in an opening at the central part of the mold fitting surface (14) of the core drive unit (1) and rotates a prescribed rotary member (56) adjacent to the movable-side mold (47). A ball screw mechanism inside the movable-side mold (47) converts the rotation into linear movement to drive a compression core (52) for compression molding.

Description

  The present invention relates to a mold for driving compression molding by driving a compression core during injection molding, a core driving device for driving the core, and injection molding including such a core driving device. Related to the machine.

  When injecting molten resin, the cavity in the mold is temporarily slightly expanded, and after injection, the cavity volume is restored and compressed before the molten resin solidifies, thereby suppressing the occurrence of sink marks. So-called compression molding, which improves the surface properties of a molded product, is well known. In compression molding, there is a method in which the mold is slightly opened and injected, and then the mold is clamped, but there is also a method in which a compression core is provided in the mold and this core is driven to change the volume of the cavity. . In the latter method, since the mold is clamped and the parting surface is closed, injection and compression are performed, so that generation of burrs is prevented.

  In a mold having such a core for compression molding, there are various core driving devices for driving the core. For example, when the core driving device is composed of a hydraulic cylinder, a hydraulic pressure source such as a hydraulic pump is provided outside, and pressure oil from the hydraulic pressure source is supplied to the hydraulic cylinder, thereby driving the core. When the core driving device is composed of a linear motor, the core can be directly driven by the linear motor. And when a core drive device consists of an electric motor and a ball screw mechanism, rotation of an electric motor is converted into a linear motion and a core is driven. There are various core drive devices as described above. These core drive devices may be provided in the mold, or may be provided on the injection molding machine side to drive the core from the injection molding machine side.

JP 2012-35533 A

  Patent Document 1 describes a predetermined demolding device that is not a core driving device for compression molding. This demolding apparatus is configured to rotate a rotating core of a mold provided with a rotating core and configured to rotate the rotating core at the time of demolding. The demolding device is provided on the movable platen of the injection molding machine, and the movable mold is attached not to the movable platen but to the plate of the demolding device. In this demolding apparatus, a hollow is opened at the center of the plate, and a rotational force can be transmitted to the rotating core on the mold side by a rotating body provided inside the hollow. The demolding device is provided with a servo motor on its side, and a bevel gear is provided at the tip of the rotation shaft of the servo motor. The bevel gear that meshes with the bevel gear is fixed to the rotating body so that the rotating body rotates. Therefore, when the servo motor is driven, the rotational force is transmitted to the rotary core, and the mold can be removed.

  Although the compression molding can be performed by a conventional core driving device to drive the compression core in the mold, there is a problem. Specifically, there is a problem in each of which the core driving device is provided on either the injection molding machine side or the mold side. First, when the core driving device is provided on the injection molding machine side, the arrangement becomes a problem. Generally, in an injection molding machine, a mold clamping mechanism such as a toggle mechanism and an ejector device for ejecting a molded product are provided in the vicinity of the central axis of the mold clamping device. This is because the mold clamping force is generated uniformly or the molded product is ejected from the vicinity of the center of the mold with a good balance. The core for carrying out the compression molding also needs to be driven from the vicinity of the center axis of the mold clamping device so that it can be compressed with good balance from the vicinity of the center of the mold. That is, it is necessary to provide the core driving device in the vicinity of the central axis of the mold clamping device. Then, when the core driving device is provided in the injection molding machine, the mold clamping mechanism, the ejector device, and the core driving mechanism are arranged on the same axis, and they interfere with each other. Or when providing these in series, the length of the axial direction of an injection molding machine becomes long. There is also a problem when a linear motor is selected as the drive mechanism. That is, since the linear motor has a drive length in the axial direction unique to the apparatus, the drive length of the core is also limited by the drive length, and there is a problem that it cannot be driven beyond this. Then, even if the core driving device is provided in the injection molding machine, the core driving length can only correspond to a mold in a general range, and the core driving length cannot correspond to a mold having a large core driving length. On the other hand, a problem is recognized when the core driving device is provided not in the injection molding machine but in the mold. In the case where the core driving device is provided in the mold, the core driving device must be provided for each mold, which increases the cost. In addition, in order to control the core driving device in the mold in synchronization with the operation of the injection molding machine, the core driving device must be connected to the controller of the injection molding machine every time the mold attached to the injection molding machine is replaced. It is complicated. There is a problem whether the place where the core driving device is provided is on the injection molding machine side or in the mold. For example, a problem due to the drive mechanism. Specifically, when the drive mechanism is a hydraulic cylinder, there is a problem that the state of the pressure oil changes due to changes in temperature or long-term operation, and although the volume of the pressure oil changes slightly due to compression, it is only that much. The driving accuracy is reduced. There are also problems of vibration and noise of the hydraulic pump, as well as contamination due to leakage of pressure oil. Furthermore, in the case of hydraulic pressure, there is a problem that it is difficult to drive the core at high speed.

  An object of the present invention is to provide a core driving apparatus and an injection molding machine including the core driving apparatus that solve the above-described problems, and specifically, various types including a core for compression molding. It is possible to cope with various types of molds and there is no need to provide a driving device in the mold, and the machine length of the injection molding machine can be increased even though the core can be driven in a balanced manner from the center of the mold. It aims at providing the core drive device which can drive a core accurately, and an injection molding machine provided with such a core drive device.

  In order to achieve the above object, the present invention provides a core driving device having a driving mechanism on a movable platen of an injection molding machine. The movable mold is attached to the mold attachment surface of the core driving device. The core drive device includes an electric motor disposed on the side of the device, a rotation shaft provided in parallel to the mold mounting surface so as to transmit the rotation of the motor, and rotation of the rotation shaft in a right angle direction. A pair of bevel gears to be converted and a rotating body that rotates thereby are provided. This rotating body is housed in an opening opened at the center of the mold mounting surface of the core driving device, and can be engaged with a predetermined rotating member on the movable mold side to transmit the rotational force. Configure. The movable side mold is provided with a conversion mechanism for converting rotation into axial driving so that a compression core for compression molding provided therein can be driven.

Thus, according to the first aspect of the present invention, in order to achieve the above object, the cavity for molding the molded product includes a fixed mold on the fixed platen side, a movable mold on the movable platen side, and the movable mold. When the compression core is driven after injecting the resin into the cavity, the compression core is driven with respect to the mold capable of compressing the resin in the cavity. A core driving device, wherein the core driving device is provided on a movable platen of an injection molding machine, and the movable side die is attached to a die attachment surface opposite to the attachment surface to the movable platen. The core driving device includes an electric motor disposed on a side of the core driving device, a rotating shaft that is provided in parallel with the mold mounting surface and transmits the rotation of the electric motor, and the rotating shaft. Rotation of the mold A pair of bevel gears that convert the rotation around an axis orthogonal to the rotation and a rotating body that is rotated by the converted rotation, the rotating body in an opening portion that is open at the center of the mold mounting surface And the rotation can be transmitted to a predetermined rotating member provided on the movable side mold, and the compression core is provided with a predetermined conversion mechanism provided in the movable side mold. Thus, the rotation of the rotating member is converted into axial driving, and the core driving device is thereby driven.
According to a second aspect of the present invention, in the core driving device according to the first aspect, a core is characterized in that a through-hole through which an ejector pin of the ejector device is inserted is opened in the rotating body in the axial direction. It is configured as a driving device.
According to a third aspect of the present invention, in the core driving device according to the first or second aspect, the rotating body includes a rotating body main body and a rotating top, and the rotating top is predetermined on an upper surface of the rotating body main body. The hole is constrained in the rotational direction and is slidably stored in the axial direction, and is urged upward by a spring provided in the hole. It is comprised as a core drive device.
According to a fourth aspect of the present invention, a cavity for molding a molded product includes a fixed mold on the fixed platen side, a movable mold on the movable platen side, and a compression core in the movable mold. A core driving device configured to drive the compression core with respect to a mold configured to compress the resin in the cavity when the compression core is driven after injecting the resin into the cavity, wherein the core The drive device is provided on a movable platen of an injection molding machine, and the movable side die is attached to a die attachment surface opposite to the attachment surface to the movable platen, and the core drive device is An electric motor disposed on a side of the core driving device; a rotating shaft provided in parallel with the mold mounting surface to transmit rotation of the electric motor; and rotation of the rotating shaft with the mold mounting surface Convert to rotation around orthogonal axes A pair of bevel gears and a ball screw mechanism that converts the converted rotation into an axial drive, the ball screw mechanism being provided in an opening defined in a central portion of the mold mounting surface; The core driving device can be connected to a predetermined driving member provided on the movable mold, and the compression core is driven when the driving member is driven. Configured as
The invention according to claim 5 is configured as an injection molding machine including the core driving device according to any one of claims 1 to 4.

  As described above, according to the present invention, the core driving device is provided on the movable platen of the injection molding machine, and is configured such that the movable side mold is attached to the mold attachment surface. Therefore, in a mold for performing compression molding, it is not necessary to provide a drive mechanism for driving the core in the mold, and the cost of the mold can be reduced. In the mold to be mounted, a cavity for molding a molded product is composed of a fixed mold on the fixed platen side, a movable mold on the movable platen side, and a compression core in the movable mold. After the resin is injected, when the compression core is driven, so-called compression molding can be performed in which the resin is compressed. By the way, according to the present invention, the core driving device includes an electric motor disposed on the side of the device, a rotating shaft that is provided in parallel with the mold mounting surface and transmits the rotation of the electric motor, and the rotation of the rotating shaft is made gold. A pair of bevel gears that convert rotation around an axis orthogonal to the mold mounting surface, and a rotating body that is rotated by the converted rotation, and the rotating body is located in an opening defined in the center of the mold mounting surface And the rotation can be transmitted to a predetermined rotating member provided toward the movable mold, and the compression core is rotated by a predetermined conversion mechanism provided in the movable mold. The rotation is converted into axial driving and driven. That is, in the core driving device, the electric motor is provided on the side of the device, so that it does not hinder other devices for the injection molding machine. That is, there is no interference with the mold clamping mechanism or the ejector device provided on the central axis of the mold clamping device of the injection molding machine. Therefore, the machine length of the injection molding machine is not increased. The electric motor is rotated by a rotating shaft and a pair of bevel gears so as to rotate the rotating body in the opening portion opened in the central portion of the mold mounting surface. That is, the rotating body is located on the central axis of the mold clamping device. Therefore, the effect that the compression core can be driven in a balanced manner from the center of the mold is also obtained. According to the present invention, only the rotation is transmitted to the rotating member provided in the movable mold, and this rotation is converted into the axial drive in the mold. In general, there is no limitation on the rotation angle of rotation. Then, since the compression core can be rotated at an arbitrary rotation angle required to be driven in the axial direction, the drive length in the axial direction is not limited. In other words, it can be used universally for various molds with different core compression drive lengths. In the core drive device of the present invention, the drive mechanism is an electric motor. Therefore, it is not contaminated by machine oil, it is energy saving and can be driven at high speed, and the molding cycle can be speeded up.

  According to another invention, in the core drive device, a through hole through which an ejector pin of the ejector device is inserted is opened in the axial direction in the rotating body. Then, the core drive device does not hinder the ejector device, and the molded product can be ejected using the ejector pin at a desired position. According to another invention, the rotating body is composed of a rotating body main body and a rotating piece, and the rotating piece is constrained in the rotation direction in a hole opened at a predetermined depth on the upper surface of the rotating body main body, It is slidably stored in the axial direction and is biased upward by a spring provided in the hole. Accordingly, when the movable mold is attached to the core driving device, the rotary piece and the rotary member can be obtained without adjusting each of the predetermined rotary member on the movable mold side and the rotary piece at an accurate rotational position. Can be easily engaged. According to still another invention, the core driving device is provided on the movable platen of the injection molding machine, and the movable side die is attached to the die attachment surface opposite to the attachment surface to the movable platen. The driving device includes an electric motor disposed on the side of the core driving device, a rotating shaft that is provided in parallel with the mold mounting surface and transmits the rotation of the electric motor, and the rotation of the rotating shaft is a mold mounting surface. A pair of bevel gears that convert rotations around orthogonal axes and a ball screw mechanism that converts the converted rotations into axial driving are provided at the center of the mold mounting surface. It can be connected to a predetermined drive member provided in the opening and provided on the movable side mold. When the drive member is driven, the compression core is driven. Then, the compression core can be driven without providing a special ball screw mechanism or the like in the mold, and the cost of the mold is further reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the core drive device which concerns on embodiment of this invention, The (a) is a rear view which looked at the core drive device from the attachment surface attached to a movable board, The (a) is the principal of a core drive device. It is a side view which shows a part in a cross section. It is a side view which shows each principal part of the metal mold | die attached to the mold clamping apparatus provided with the core drive device which concerns on embodiment of this invention, and a mold clamp device and a core drive device. It is a side view which shows each principal part of the metal mold | die attached to the mold clamping apparatus provided with the core drive device which concerns on other embodiment of this invention, and a mold clamp device and a core drive device.

  Embodiments of the present invention will be described below. The core drive device 1 according to the present embodiment is one of the devices constituting the injection molding machine, and more specifically, is a device provided on the movable platen of the mold platen device of the injection molding machine. . Or it can be said that the core drive device 1 comprises a part of movable board. 1A is a rear view of the core driving device 1 as viewed from the back surface thereof, that is, the movable plate mounting surface 13 that is a mounting surface to the movable plate 2, and the injection in a state where the core drive device 1 is attached to the movable plate 2. FIG. The four tie bars 3, 3,... Of the molding machine are indicated by dotted lines. 1A is a cross-sectional view of the vicinity of the center of the core driving device 1 taken along line XX in FIG. 1A, and the movable platen 2 to which the core driving device 1 is attached is indicated by a dotted line. It is shown.

  The core drive device 1 is generally composed of a plate 6 having a substantially quadrangular top surface, and an electric motor 7 provided on an end surface on the side of the plate 6 so that the rotation axis faces the center of the plate 6. Has been. The plate 6 has a shape similar to the shape of the upper surface of the movable platen 2 and is attached so as to be almost completely overlapped with the movable platen 2. The back surface of the plate 6 is a movable plate attachment surface 13 attached to the movable platen 2, and the front surface is a die attachment surface 14 to which a movable mold is attached. The rectangular four corners of the plate 6 are cut out as indicated by reference numerals 5, 5,... So as not to interfere with the tie bars 3, 3,. A relatively large-diameter cutout 9 is opened at the center of the plate 6. The cut-out 9 penetrates from the movable plate mounting surface 13 to the mold mounting surface 14. The hollow 9 stores a rotating body 16 described later. In addition, a plurality of small-diameter through holes 10, 10,... Penetrating from the movable plate mounting surface 13 to the mold mounting surface 14 are formed in the plate 6, and these are ejector rods protruding from the movable plate 2 side. Are inserted through holes 10, 10,. In FIG. 1A, only four insertion holes 10 are shown, but a larger number may be provided. On the side of the movable plate mounting surface 13 of the plate 6, a bottomed groove 11 is formed that reaches the hollow 9 in the center from the side end where the electric motor 7 is mounted. The groove 11 is a groove in which a transmission mechanism for transmitting the rotation of the electric motor 7 to the rotating body is stored, and is formed to a minimum width necessary for storing the transmission mechanism. Therefore, the mold clamping force acting on the movable platen 2 is not affected by the groove 11 and acts uniformly on the movable mold attached to the core driving device 1. Further, as shown in FIG. 1A, the groove 11 is formed obliquely at a predetermined angle with respect to the upper and lower sides of the quadrilateral of the plate 6. Since it is formed obliquely in this way, the transmission mechanism stored in the groove 11 does not hinder the ejector rod. A shallow hole 15 having a diameter larger than that of the hollow 9 is also formed on the movable plate mounting surface 13 side of the plate 6, and a cover 25 for holding the rotating body stored in the hollow 9 is fitted into the hole 15. Yes.

  In the present embodiment, it is the rotating body 16 that transmits the rotation to the movable mold side. The rotating body 16 includes a rotating body main body 17, a rotating piece 19, and a spring 20. The rotating body 17 is a relatively large diameter rotating member. In the rotating body 17, an ejector rod insertion hole 24 through which the ejector rod 22 is inserted is opened in the axial direction. The rotary body 17 is provided so that the axis of rotation thereof is perpendicular to the mold mounting surface 14 of the plate 6 and is rotatably attached to the plate 6 via ball bearing mechanisms 23, 23,. It has been. A first bevel gear 26 is integrally fixed to the bottom of the rotary body 17. The rotary body 17 is attached to the hollow 9 by a cover 25, and ball bearing mechanisms 28, 28,... Are provided between the first bevel gear 26 and the cover 25. Since the rotating body 17 is supported by these ball bearing mechanisms 23, 28,..., The rotating body 17 can rotate smoothly without being shaken.

  On the upper surface 29 of the rotating body 17, a first hole 30 having a predetermined diameter and a large diameter is formed concentrically with the ejector rod insertion hole 24. A second hole 31 having a smaller diameter than the hole 30 is opened at a predetermined depth on the bottom surface of the first hole 30. The large-diameter first hole 30 is a rotary piece storage hole 30 in which the rotary piece 19 is stored, and the small-diameter second hole 31 is a spring storage hole 31 in which the spring 20 is stored. A plurality of key grooves 35, 35,... Are formed in the rotary piece storage hole 30 in the axial direction so as to transmit a rotational force to the rotary piece 19 as will be described later.

  The rotary piece 19 is a rotary member having a size just stored in the rotary piece storage hole 30, and its outer diameter is slightly smaller than the inner diameter of the rotary piece storage hole 30. An ejector rod insertion hole 33 through which the ejector rod 22 is inserted is also formed in the rotary piece 19. A protrusion that engages with a predetermined rotating member on the movable mold side is formed on the upper surface of the rotating piece 19, but is not shown in FIG. 1. .. Are also formed on the outer peripheral surface of the rotary piece 19 in the axial direction.

  The rotating body 16 is assembled such that the spring 20 is inserted into the spring housing hole 31 of the rotating body main body 17 and the rotating piece 19 is inserted into the rotating piece storage hole 30 from above. Further, sliding keys 38, 38,... That fit into both the key grooves 35, 35,... On the rotating body main body 17 side and the key grooves 36, 36,. Therefore, the rotary piece 19 can be slid in the axial direction while receiving the rotational force from the rotary body 17, and according to the present embodiment, the rotary piece 19 is urged upward by the spring 20. Has been. As a result, the head of the rotary piece 19 protrudes slightly from the surface 14 of the plate 6. Since the spring 20 is biased upward as described above, when the movable mold is attached to the surface 14 of the plate 6, the mold in which the head of the rotary piece 19 is provided in the movable mold. Even if the projection of the head of the rotary piece 19 is not engaged with the projection of the mold side rotary member, it will be properly engaged when the rotary piece 19 is rotated a little. It will automatically mesh with the position. Further, since the rotary piece 19 can be pushed in against the urging force of the spring 20, a conventionally well-known mold having no rotary parts can be easily attached without the rotary piece 19 being obstructed. .

  The transmission mechanism for transmitting the rotational force of the electric motor 7 to the rotating body 16 is fixed to the rotating shaft 44 connected to the output shaft 41 of the electric motor 7 via the coupling 42 and the tip of the rotating shaft 44. The second bevel gear 45 and the first bevel gear 26 meshed with the second bevel gear 45 are configured. The first bevel gear 26 is fixed to the rotating body 17 as already described. Since the rotation shaft 44 is disposed in the groove 11 and the first and second bevel gears 26 and 45 are disposed in the hollow 9, it does not interfere with other devices.

  The core drive device 1 configured as described above is attached to the movable platen 2 with a predetermined bolt so that the movable platen attachment surface 13 side is in close contact with the movable platen 2. The electric motor 7 is connected to and driven by a predetermined control line with a controller of an injection molding machine (not shown). Accordingly, the core driving device 1 is driven in conjunction with the molding cycle.

  The metal mold | die attached to the injection molding machine provided with the core drive device 1 which concerns on this Embodiment with FIG. 2 is demonstrated. The molds 46 and 47 according to the present embodiment are molds each having a compression core for compression molding inside the mold, and the fixed side mold 46 attached to the stationary platen 4 and the mold of the plate 6. The movable mold 47 is attached to the mold mounting surface 14. The fixed mold 46 is formed with a recess 48 having a predetermined depth on the parting surface. A runner 49 that guides the molten resin from the back surface of the fixed mold 46 is opened at the bottom of the recess 48. The nozzle of the injection device 50 composed of a heating cylinder and a screw is inserted from the opening of the stationary platen 4 and is in contact with a sprue bush provided on the back surface of the stationary mold 46 with a predetermined touch force.

  The movable mold 47 of the mold according to the present embodiment includes a compression core 52 inside. The compression core 52 includes a head portion 53 and a bottom portion 54 having a larger diameter than the head portion 53. The movable die 47 is formed with a concave portion 55 opened in the parting surface and a bore 56 having a larger diameter than the concave portion 55. The compression core 52 has a head portion 53 and a bottom portion 54 slidably inserted into the recess 55 and the bore 56 of the movable mold 47, respectively. These sliding portions are provided with bushes to slide smoothly and liquid-tightly. In the present embodiment, the cavity for obtaining the molded product is composed of the concave portion 48 of the fixed side mold 46, the concave portion 55 of the movable side mold 47, and the head portion 53 of the compression core 52, and drives the compression core 52. When the head portion 53 is driven in the axial direction, the volume of the cavity is reduced and the injected resin is compressed.

  In the movable mold 47 according to the present embodiment, an opening is formed in the mounting surface to the core driving device 1, and the rotating member 56 is supported by the bearings 57 and 57 in the opening. It is provided freely. A ball screw mechanism is provided inside the compression core 52, and a ball nut 58 of the ball screw mechanism is fixed to the compression core 52. The ball screw 59 of the ball screw mechanism is fixed to the rotating member 56. Therefore, when the rotating member 56 rotates, the rotation is converted into a linear motion by the ball screw mechanism, and the compression core 52 is driven in the axial direction. The rotating member 56 of the movable mold 47 is engaged with the rotating piece 19 of the rotating body 16 of the core driving device 1 according to the present embodiment.

  Next, a method of molding by compression molding in the injection molding machine to which the mold according to the present embodiment is attached will be described. The platen device is driven to clamp the fixed side mold 46 and the movable side mold 47. Then, a cavity is constituted by the recess 48 of the fixed mold 46, the recess 55 of the movable mold 47, and the head 53 of the compression core 52. In the core drive device 1, the electric motor 7 is driven to rotate in the reverse direction. When the electric motor 7 rotates in the reverse direction, the rotation is transmitted and converted in the order of the rotating shaft 44 and the first and second bevel gears 26 and 45, and the rotating body 16, that is, the rotating piece 19 rotates. The rotation is transmitted to the rotation member 56, the rotation is converted into a linear motion by the ball screw mechanisms 58 and 59, and the compression core 52 moves backward. The molten resin is injected from the injection device 50 into the cavity. The electric motor 7 is rotated forward. Then, the rotation is transmitted to the rotating shaft 44, the first and second bevel gears 26 and 45, the rotating body 16, and the rotating member 56. The rotation is converted into a linear motion by the ball screw mechanisms 58 and 59, and the compression core 52 is driven in the axial direction. That is, the volume of the cavity is reduced and the resin is compressed. The resin shrinks as it cools, but since the compression core 52 is driven and compressed in the axial direction, there is no sink in the molded product. When the mold is opened after cooling and solidification, a molded product is obtained.

  FIG. 3 shows a core driving apparatus 1 ′ according to the second embodiment of the present invention. The same members and parts as those of the core drive device 1 according to the previous embodiment are given the same reference numerals, and descriptions thereof are omitted. In the core drive device 1 ′ according to the second embodiment, the rotating body 16 of the core drive device 1 according to the previous embodiment is replaced with a ball screw mechanism 61. That is, in the core drive device 1 ′ according to the second embodiment, the first bevel gear 26 is fixed to the ball nut 62 of the ball screw mechanism 61 and rotates this ball nut 62. The ball screw 63 of the ball screw mechanism 61 is provided at the opening of the plate 6 in a state where rotation is restricted via the spline key 64 and axial driving is allowed. Therefore, when the ball nut 62 rotates, the ball screw 63 is driven in the axial direction. The end of this ball screw 63 is connected to a pressing member 65 in the movable mold 47 '. The pressing member 65 is fixed to the compression core 52. That is, in the core drive device 1 ′ according to the second embodiment, when the electric motor 7 is driven, the rotation is transmitted to the rotation shaft 44, the first and second bevel gears 26 and 45, and the ball nut 62, and the ball screw mechanism. In 61, it is converted into a linear motion. Then, the compression core 52 integrated with the pressing member 65 is driven.

DESCRIPTION OF SYMBOLS 1 Core drive device 2 Movable board 3 Tie bar 6 Plate 7 Electric motor 9 Drilling 11 Groove 16 Rotating body 17 Rotating body main body 19 Rotating piece 20 Spring 22 Ejector rod 24 Ejector rod insertion hole 25 Cover 26 First bevel gear 30 Rotating piece storage Holes 35 and 36 Key groove 38 Key 44 Rotating shaft 45 Second bevel gear 46 Fixed side mold 47 Movable side mold 50 Injection device 52 Compression core 56 Rotating member 58 Ball nut 59 Ball screw 61 Ball screw mechanism 62 Ball nut 63 Ball screw 64 Spline key 65 Push member

Thus, according to the first aspect of the present invention, in order to achieve the above object, the cavity for molding the molded product includes a fixed mold on the fixed platen side, a movable mold on the movable platen side, When the compression core is driven after injecting the resin into the cavity, the compression core is driven with respect to the mold capable of compressing the resin in the cavity. A core driving device, wherein the core driving device is provided on a movable platen of an injection molding machine, and the movable side die is attached to a die attachment surface opposite to the attachment surface to the movable platen. The core driving device includes an electric motor disposed on a side of the core driving device, a rotating shaft that is provided in parallel with the mold mounting surface and transmits the rotation of the electric motor, and the rotating shaft. Rotation of the mold A pair of bevel gears that convert the rotation around an axis orthogonal to the rotation and a rotating body that is rotated by the converted rotation, the rotating body in an opening portion that is open at the center of the mold mounting surface And the rotation can be transmitted to a predetermined rotating member provided in the movable mold , and the compression core is provided by a predetermined conversion mechanism provided in the movable mold. The rotation of the rotating member is converted into an axial drive, and is driven thereby.
According to a second aspect of the present invention, in the core driving device according to the first aspect, a core is characterized in that a through-hole through which an ejector pin of the ejector device is inserted is opened in the rotating body in the axial direction. It is configured as a driving device.
According to a third aspect of the present invention, in the core driving device according to the first or second aspect, the rotating body includes a rotating body main body and a rotating top, and the rotating top is predetermined on an upper surface of the rotating body main body. The hole is constrained in the rotational direction and is slidably stored in the axial direction, and is urged upward by a spring provided in the hole. It is comprised as a core drive device.
According to a fourth aspect of the present invention, a cavity for molding a molded product includes a fixed mold on the fixed platen side, a movable mold on the movable platen side, and a compression core in the movable mold. A core driving device configured to drive the compression core with respect to a mold configured to compress the resin in the cavity when the compression core is driven after injecting the resin into the cavity, wherein the core The drive device is provided on a movable platen of an injection molding machine, and the movable side die is attached to a die attachment surface opposite to the attachment surface to the movable platen, and the core drive device is An electric motor disposed on a side of the core driving device; a rotating shaft provided in parallel with the mold mounting surface to transmit rotation of the electric motor; and rotation of the rotating shaft with the mold mounting surface Convert to rotation around orthogonal axes A pair of bevel gears and a ball screw mechanism that converts the converted rotation into an axial drive, the ball screw mechanism being provided in an opening defined in a central portion of the mold mounting surface; and can be linked to predetermined pressing member provided in said movable mold, as the core drive device, characterized in that the compressed core and driving the pressing member is adapted to be driven Composed.
The invention according to claim 5 is configured as an injection molding machine including the core driving device according to any one of claims 1 to 4.

As described above, according to the present invention, the core driving device is provided on the movable platen of the injection molding machine, and is configured such that the movable side mold is attached to the mold attachment surface. Therefore, in a mold for performing compression molding, it is not necessary to provide a drive mechanism for driving the core in the mold, and the cost of the mold can be reduced. In the mold to be mounted, a cavity for molding a molded product is composed of a fixed mold on the fixed platen side, a movable mold on the movable platen side, and a compression core in the movable mold. After the resin is injected, when the compression core is driven, so-called compression molding can be performed in which the resin is compressed. By the way, according to the present invention, the core driving device includes an electric motor disposed on the side of the device, a rotating shaft that is provided in parallel with the mold mounting surface and transmits the rotation of the electric motor, and the rotation of the rotating shaft is made gold. A pair of bevel gears that convert rotation around an axis orthogonal to the mold mounting surface, and a rotating body that is rotated by the converted rotation, and the rotating body is located in an opening defined in the center of the mold mounting surface And the rotation can be transmitted to a predetermined rotating member provided in the movable side mold , and the compression core can be transferred to the rotating member by a predetermined conversion mechanism provided in the movable side mold. The rotation is converted into an axial drive and driven. That is, in the core driving device, the electric motor is provided on the side of the device, so that it does not hinder other devices for the injection molding machine. That is, there is no interference with the mold clamping mechanism or the ejector device provided on the central axis of the mold clamping device of the injection molding machine. Therefore, the machine length of the injection molding machine is not increased. The electric motor is rotated by a rotating shaft and a pair of bevel gears so as to rotate the rotating body in the opening portion opened in the central portion of the mold mounting surface. That is, the rotating body is located on the central axis of the mold clamping device. Therefore, the effect that the compression core can be driven in a balanced manner from the center of the mold is also obtained. According to the present invention, only the rotation is transmitted to the rotating member provided in the movable mold, and this rotation is converted into the axial drive in the mold. In general, there is no limitation on the rotation angle of rotation. Then, since the compression core can be rotated at an arbitrary rotation angle required to be driven in the axial direction, the drive length in the axial direction is not limited. In other words, it can be used universally for various molds with different core compression drive lengths. In the core drive device of the present invention, the drive mechanism is an electric motor. Therefore, it is not contaminated by machine oil, it is energy saving and can be driven at high speed, and the molding cycle can be speeded up.

According to another invention, in the core drive device, a through hole through which an ejector pin of the ejector device is inserted is opened in the axial direction in the rotating body. Then, the core drive device does not hinder the ejector device, and the molded product can be ejected using the ejector pin at a desired position. According to another invention, the rotating body is composed of a rotating body main body and a rotating piece, and the rotating piece is constrained in the rotation direction in a hole opened at a predetermined depth on the upper surface of the rotating body main body, It is slidably stored in the axial direction and is biased upward by a spring provided in the hole. Accordingly, when the movable mold is attached to the core driving device, the rotary piece and the rotary member can be obtained without adjusting each of the predetermined rotary member on the movable mold side and the rotary piece at an accurate rotational position. Can be easily engaged. According to still another invention, the core driving device is provided on the movable platen of the injection molding machine, and the movable side die is attached to the die attachment surface opposite to the attachment surface to the movable platen. The driving device includes an electric motor disposed on the side of the core driving device, a rotating shaft that is provided in parallel with the mold mounting surface and transmits the rotation of the electric motor, and the rotation of the rotating shaft is a mold mounting surface. A pair of bevel gears that convert rotations around orthogonal axes and a ball screw mechanism that converts the converted rotations into axial driving are provided at the center of the mold mounting surface. provided in the opening, and can be linked to predetermined pressing member provided in the movable mold, the compressed core for driving the pressing member is adapted to be driven. Then, the compression core can be driven without providing a special ball screw mechanism or the like in the mold, and the cost of the mold is further reduced.

Claims (5)

A cavity for molding a molded product is composed of a fixed mold on the fixed platen side, a movable mold on the movable platen side, and a compression core in the movable mold, and the resin is injected into the cavity After driving the compression core, a core driving device that drives the compression core against a mold that can compress the resin in the cavity,
The core driving device is provided on a movable plate of an injection molding machine, and the movable side die is attached to a die attachment surface opposite to the attachment surface to the movable plate,
The core driving device includes an electric motor disposed on a side of the core driving device, a rotating shaft provided in parallel with the mold mounting surface and transmitting the rotation of the electric motor, and rotation of the rotating shaft. A pair of bevel gears that convert the rotation around an axis orthogonal to the mold mounting surface, and a rotating body that is rotated by the converted rotation,
The rotating body is stored in an opening opened in a central portion of the mold mounting surface, and can transmit rotation to a predetermined rotating member provided on the movable side mold, The compression core is characterized in that the rotation of the rotating member is converted into axial driving by a predetermined conversion mechanism provided in the movable mold, and is driven thereby. Drive device. 2. The core driving device according to claim 1, wherein a through-hole through which an ejector pin of the ejector device is inserted is formed in the rotating body in an axial direction. 3. The core driving device according to claim 1, wherein the rotating body includes a rotating body main body and a rotating top, and the rotating top is a hole opened at a predetermined depth on an upper surface of the rotating body main body. Further, the core driving device is restrained in the rotational direction and slidably stored in the axial direction, and is biased upward by a spring provided in the hole. A cavity for molding a molded product is composed of a fixed mold on the fixed platen side, a movable mold on the movable platen side, and a compression core in the movable mold, and the resin is injected into the cavity After driving the compression core, a core driving device that drives the compression core against a mold that can compress the resin in the cavity,
The core driving device is provided on a movable plate of an injection molding machine, and the movable side die is attached to a die attachment surface opposite to the attachment surface to the movable plate,
The core driving device includes an electric motor disposed on a side of the core driving device, a rotating shaft provided in parallel with the mold mounting surface and transmitting the rotation of the electric motor, and rotation of the rotating shaft. A pair of bevel gears that convert rotation into a rotation around an axis orthogonal to the mold mounting surface, and a ball screw mechanism that converts the converted rotation into axial drive,
The ball screw mechanism can be connected to a predetermined driving member provided in an opening provided in a central portion of the mold mounting surface and connected to the movable mold. A core driving device, wherein the compression core is driven when a member is driven. An injection molding machine comprising the core driving device according to any one of claims 1 to 4.

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