JP2007152820A - Injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding machine having a molding die turning device which makes an injection molding machine simple and low cost and has high reliability. <P>SOLUTION: The injection molding machine 18 turning a half of a molding die device 11 around a vertical axis between a fixed plate 4 and a moving plate 5 of a die clamping device 1 is provided with a transferring plate 13 on which a half of the molding die device 11 is detachably set to transfer it along the die open-close direction and with a fixedly mounted turning driving means 3 which detachably elevates and lowers a half of the molding die device 11 and turns it when in elevating a half of the molding die device 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an injection molding machine in which half of a mold apparatus is rotated about a vertical axis between a fixed plate and a movable plate of a mold clamping device in order to mold a molded product made of multiple materials.

  There exists patent document 1 in this technical field. Patent Document 1 discloses a bed set in a mold opening / closing direction, a first mold platen (fixed platen) fixed on the bed and mounting a mold, and supported on the bed so as to be movable with respect to the first mold platen. A second mold platen (movable platen) for mounting the mold, a rotating device including a base plate provided between the first mold platen and the second mold plate and housed in the bed, and a base plate so as to rotate about a vertical axis The present invention relates to a horizontal injection molding machine including a rotary table supported above, a driving unit that rotates the rotary table, and a moving unit that moves the rotating device in a direction parallel to the mold opening and closing direction.

  By the way, in a large injection molding machine in which the mold clamping force exceeds 10,000 kN, the weight of the mold apparatus is several tens of tons or more, and a large rotating apparatus for rotating the mold apparatus is required. Therefore, in an injection molding machine to which the technology of Patent Document 1 is applied, particularly a large-sized injection molding machine, the rotating device is moved together with the opening and closing of the mold during the molding process. Invite consumption. Further, the weight of the rotating device is added to the weight of the large mold, so that the base plate sinks, making it difficult to align the molds.

US Patent No. US6830448

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an injection molding machine having a mold rotating device that is simplified and reduced in cost and has high reliability.

  The present invention relates to an injection molding machine in which a half of a mold device is rotated about a vertical axis between a fixed plate and a movable plate of a mold clamping device. The present invention relates to an injection molding machine comprising: a moving plate for moving the mold apparatus; and a fixed rotational driving means for rotating the half of the mold apparatus up and down detachably and rotating the half of the mold apparatus when the half of the mold apparatus is raised.

  According to the injection molding machine of the present invention, the mold rotating device is simplified, the cost is reduced, and the reliability is increased, so that the production efficiency of the molded product is improved.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view in a molding process of an injection molding machine provided with a mold rotating device of the present invention. FIG. 2 is a front view at the start of molding of an injection molding machine provided with the mold rotating device of the present invention. FIG. 3 is a front view of the injection molding machine equipped with the mold rotation device of the present invention when the mold device is attached. FIG. 4 is a cross-sectional view taken along the line AA in FIG.

  The injection molding machine 18 is of a horizontal type provided with a mold clamping device 1, an injection device 2, a rotation drive unit 3, a moving plate 13, a horizontal drive unit 16 and an auxiliary drive unit 15. The mold clamping device 1 includes a stationary platen 4 that is disposed on the gantry 17 and is fixed to the gantry 17, and a movable platen 5 that is opposed to the stationary platen 4 and moves toward and away from the stationary platen 4. A fixed die 6 is attached to the fixed platen 4, and a movable die 10 is attached to the movable platen 5, respectively. The fixed mold 6 and the movable mold 10 can be matched with the first rotating mold 7 or the second rotating mold 9. The first rotary mold 7 and the second rotary mold 9 are attached to the front and back of the mounting board 8 and are moved by the moving board 13 or rotated via a base 12 fixed to the lower surface of the mounting board 8. It is rotated by the driving means 3. The fixed die 6, the first rotary die 7, the mounting plate 8, the second rotary die 9 and the movable die 10 constitute a mold device 11. The mold device 11 and the rotation driving means 3 constitute a mold rotation device. The unillustrated pressure-clamping mechanism of the mold clamping device 1 is a known one that uses hydraulic pressure or a servo motor as a drive source.

  The injection device 2 plasticizes a resin raw material or the like to form a molten material, and injects the molten material to the mold device 11. The injection device 2 injects the molten material into the cavity formed by the fixed mold 6 and the first rotating mold 7 or the second rotating mold 9, so that the surface of the fixed platen 4 opposite to the surface on which the fixed mold 6 is attached. Is provided. The other injection device 2 injects the molten material into the cavity formed by the movable die 10 and the second rotary die 9 or the first rotary die 7, so that the pressing mechanism of the movable platen 5 is as shown in FIG. In addition, when the movable platen 5 is provided on the opposite side of the surface to which the movable mold 10 is attached, it is provided on the back side of the side surface of the movable mold 10. When the pressing mechanism of the movable platen 5 is not provided on the side opposite to the surface of the movable platen 5 on which the movable mold 10 is attached, another injection device 2 can be provided at this position.

  Based on FIG. 4, the moving board 13 and the rotation drive means 3 will be described in detail. The movable platen 13 has a central opening and is a rectangular thick plate provided with two positioning pins 20 provided symmetrically on a line parallel to a direction orthogonal to the mold opening / closing direction connecting the centers of the fixed platen 4 and the movable platen 5. It is. The positioning pin 20 is obtained by extending a rod of a hydraulic piston, and the tip surface of the positioning pin 20 can be selected and controlled to be the same surface as the upper surface of the moving plate 13 or a protruding surface. When the positioning pin 20 protrudes, the positioning pin 20 is inserted into and engaged with a positioning hole 21 provided on the lower surface of the base 12 to position the base 12. Electromagnets 40 are embedded in the vicinity of the four corners of the moving board 13. After the base 12 is positioned and mounted on the movable base 13, the electromagnet is energized to strengthen the engagement between them. As shown in this example, the electromagnet 40 is effective as an engaging means at a portion where it is difficult to employ an engaging means such as a mechanical claw. A linear motion guide member 14 is provided between the lower surface of the movable platen 13 and the upper surface of the housing 28 so that the movable platen 13 can be easily moved in the mold opening / closing direction. Although the case 28 is illustrated as being supported by the gantry 17, it may be installed independently on the foundation 39 instead of the gantry 17. Further, the linear motion guide member 14 may be provided not on the housing 28 but on the gantry 17.

  The rotary shaft 24 has a large-diameter portion and a small-diameter portion. The large-diameter portion can be moved up and down and rotated to the stepped recess of the housing 28 via the sliding member 25 and the small-diameter portion via the sliding member 27. Is inserted. A plurality of engagement pins 23 project from the upper end surface of the rotating shaft 24. The engagement pin 23 is a plurality of engagement holes provided on the lower surface of the base 12 when the base 12 is positioned and mounted on the mobile base 13 and the rotary shaft 24 is lifted by loose insertion through the central opening of the mobile base 13. 22 is engaged and engaged. A gear 29 is provided outside a non-rotatable portion through a key 26 at a small diameter portion adjacent to the large diameter portion of the rotary shaft 24. A gear 30 is engaged with the gear 29, a gear 31 is engaged with the gear 30, and a motor 32 is connected to the gear 31. The length of the teeth of the gear 29 is longer than the length of the teeth of the gears 30 and 31 by the rising stroke of the rotating shaft 24, and can be engaged while the rotating shaft 24 moves up and down. The motor 32 may be either a hydraulic type or an electric type.

  A cylinder 33 is formed inside the end of the small diameter portion of the rotating shaft 24. A piston 34 is fitted into the cylinder 33 so that the cylinder 33 can be moved up and down. The lower end portion of the piston 34 is reduced in diameter, and a bearing 35 is fitted into the reduced diameter portion, and the piston 34 is rotatably supported by a step portion of the reduced diameter portion. A rotary joint 36 is connected to the lower end surface of the piston 34. Inside the piston 34, there are a passage 37 communicating with the upper hydraulic chamber 41 and the rotary joint 36 formed by the cylinder 33 and the piston 34, and a lower hydraulic chamber 42 and the rotary joint 36 formed by the cylinder 33 and the piston 34. And a passage 38 communicating with the pierced hole.

  The mounting board 8 fixed on the base 12 and the first rotary mold 7 and the second rotary mold 9 fixed to it constitute a half of the mold apparatus 11. When the half of the mold apparatus 11 is rotated, in the state shown in FIG. 2, the energization to the electromagnet 40 is cut off, pressure oil is supplied to the upper hydraulic chamber 41 via the rotary joint 36 and the passage 37, and the rotation is performed. The shaft 24 is raised. The rotary shaft 24 rises while the engaging pin 23 is inserted into the engaging hole 22, engages with the base 12, and is integrated, and there is a slight gap between the lower surface of the base 12 and the upper surface of the movable base 13. Stop and hold the lift at the resulting position. Thereafter, if the protruding positioning pin 20 is lowered, the tip of the positioning pin 20 does not protrude from the upper surface of the movable board 13, so that the motor 32 can rotate the board 12. The direction of rotation may be either left or right, and the rotation direction may be changed according to the molding process.

  Further, after the half of the mold apparatus 11 is rotated, when the platform 12 is placed again on the movable platen 13, in the state shown in FIG. Half rotation of the mold apparatus 11 is stopped at a predetermined position where the positioning pin 20 can engage with the positioning hole 21. The positioning pin 20 is raised so that the tip of the positioning pin 20 is fitted into the positioning hole 21. The pressure oil supplied to the upper hydraulic chamber 41 is shut off, and the pressure oil conduit is switched so that the upper hydraulic chamber 41 communicates with a tank (not shown). At the same time, the pressure oil conduit is switched so that the pressure oil is supplied to the lower hydraulic chamber 42. In addition to its own weight, the rotating shaft 24 is lowered by the weight of the mold apparatus 11 and the base 12. The descending speed is controlled by adjusting the flow rate and / or pressure of the pressure oil discharged from the upper hydraulic chamber 41. The bottom surface of the base plate 12 abuts on the top surface of the movable platen 13 so that the base plate 12 is positioned and placed on the movable platen 13. Thereafter, the rotating shaft 24 is further lowered to a state shown in FIG. 4 and stopped so that the engaging pin 23 does not interfere with the moving moving plate 13.

  Next, a molding process using the mold apparatus 11 will be described. First, when the mold apparatus 11 is attached to the mold clamping apparatus 1 of the injection molding machine 18 prior to molding, the same procedure as described above after half of the mold apparatus 11 is rotated, as shown in FIG. Thus, the mold apparatus 11 is positioned and placed on the upper surface of the movable platen 13. Then, the movable platen 13 is moved to the fixed platen 4 side by the horizontal driving means 16 composed of a hydraulic cylinder or the like so that the fixed die 6 contacts the fixed platen 4. The fixed mold 6 that is in contact with the fixed platen 4 is fixed to the fixed platen 4. Further, the movable platen 5 is moved to close the mold and brought into contact with the movable die 10, and the movable die 10 is fixed to the movable platen 5. This completes the operation of attaching the mold apparatus 11 to the mold clamping apparatus 1. Subsequently, the movable platen 5 is moved in the mold opening direction, and the movable platen 13 is moved in the mold opening direction so that the base 12 can engage with the rotation driving means 3 and a predetermined position where the half of the mold apparatus 11 can rotate. To stop. FIG. 2 showing this state shows not only the time point at which molding is started but also the state at the time point when half of the mold apparatus 11 starts to rotate.

  By the way, when the movable platen 5 and the movable platen 13 are closed for molding from the state of FIG. 2 and matched with the state of FIG. 1, the fixed die 6 is fixed to the fixed platen 4 in the state of FIG. There is a problem that good mold matching cannot be performed. That is, the fixed mold 6 is such that the gantry 17 or the housing 28 bends due to the total weight of the mold apparatus 11 including the fixed mold 6 and the movable mold 10 which are relatively heavy. 4 is fixed. Therefore, as shown in FIG. 2, when the mold matching is performed in a state where the fixed mold 6 and the movable mold 10 are eliminated and the bending of the gantry 17 or the housing 28 is reduced, the mold matching surface is displaced. In order to solve this problem, auxiliary driving means 15 is provided. The auxiliary drive means 15 is installed in a linear motion where a plane parallel to the surface of the stationary platen 4 at the center of gravity at the position where the mold device 11 contacts the stationary platen 4 intersects the linear motion guide members 14 and 14. It is near the lower part of the position on the guide member 14. The output of the auxiliary drive means 15 is upward with a value corresponding to the total weight of the fixed mold 6 and the movable mold 10. The auxiliary driving means 15 is preferably a hydraulic cylinder device in that a large output can be obtained with a small volume, but an electric motor or the like may be used.

  The molding cycle starts from the state in FIG. The movable platen 5 and the movable platen 13 are closed and moved to the state shown in FIG. The fixed mold 6 and the first rotating mold 7 as well as the movable mold 10 and the second rotating mold 9 are simultaneously pressed by a pressing mechanism (not shown). A first molten material is injected from one injection device 2 into a cavity composed of a fixed mold 6 and a first rotating mold 7, and a second molten material different from the first molten material is movable from the other injection device 2. 10 and the second rotary mold 9 are injected into a cavity. When the molten material in the cavity is solidified, the mold is opened as shown in FIG. 2, and after the molded product is taken out from one of the cavities, the mold is rotated. The mold is closed again, and the fixed mold 6 and the second rotary mold 9 as well as the movable mold 10 and the first rotary mold 7 are simultaneously clamped by a pressing mechanism (not shown). A first molten material is injected from one injection device 2 into a cavity composed of a fixed die 6 and a second rotary die 9, and a second molten material different from the first molten material is movable from the other injection device 2. 10 and the first rotating mold 7 are injected into a cavity. When the molten material in the cavity is solidified, the mold is opened, and after removing the molded product from one of the cavities, the mold is rotated. Thereafter, the molding cycle is continuously executed by this repetition. When injection compression molding is performed, the molding process can be configured so that the two injection devices are not operated simultaneously as described above, but are operated alternately at different points in time.

  The present invention is not limited to the embodiments described above, and various modifications can be added and implemented without departing from the spirit of the invention.

It is a front view in the shaping | molding process of the injection molding machine provided with the metal mold | die rotation apparatus of this invention. It is a front view at the time of a shaping | molding start of the injection molding machine provided with the metal mold | die rotation apparatus of this invention. It is a front view at the time of attachment of the mold apparatus of the injection molding machine provided with the mold rotation apparatus of this invention. It is arrow sectional drawing of the AA part in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold clamping apparatus 2 Injection apparatus 3 Rotation drive means 4 Fixed board 5 Movable board 6 Fixed mold 7 1st rotation type 8 Mounting board 9 2nd rotation type 10 Movable type 11 Mold apparatus 12 Base 13 Moving board 14 Linear motion guide Member 15 Auxiliary drive means 16 Horizontal drive means 17 Base 18 Injection molding machine 20 Positioning pin 21 Positioning hole 22 Engagement hole 23 Engagement pin 24 Rotating shaft 25, 27 Sliding member 26 Key 28 Housing 29, 30, 31 Gear 32 Motor 33 Cylinder 34 Piston 35 Bearing 36 Rotary joint 37, 38 Passage 39 Foundation 40 Electromagnet 41 Upper hydraulic chamber 42 Lower hydraulic chamber

Claims (3)

In an injection molding machine in which half of the mold device is rotated about the vertical axis between the fixed plate and movable plate of the mold clamping device,
A movable platen that detachably mounts half of the mold apparatus and moves in the mold opening and closing direction, and half of the mold apparatus is moved up and down detachably and rotated when the half of the mold apparatus is raised. An injection molding machine comprising: a rotational drive means fixedly provided.   The injection molding machine according to claim 1, wherein electromagnetic force is used as means for fixing half of the mold apparatus placed on the moving plate.   The injection molding machine according to claim 1, further comprising auxiliary driving means for pressing the linear motion guide member of the moving plate upward.

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