JP5595755B2 - Clamping method and apparatus, and injection molding machine using the same - Google Patents

Description

  The present invention relates to a mold clamping method, a mold clamping apparatus capable of performing the mold clamping method, and an injection molding machine incorporating the mold clamping apparatus.

  Various mold clamping devices have been devised in an injection molding machine for producing a molded product in a mold. In particular, the toggle link system is effective for obtaining a large clamping force with a small driving force, and is widely employed because it can take a large moving stroke.

  On the other hand, Patent Document 1 discloses a mechanism in which a moving mechanism for opening and closing a mold and a drive mechanism for generating a mold clamping force are separated. This is because a fixed mold is attached to a stationary fixed mold holder, a moving mechanism that moves the movable mold holder to which the movable mold is mounted, and a drive unit that applies a clamping force to the entire moving mechanism. It consists of and.

  Japanese Patent Application Laid-Open No. 2004-151867 discloses a mold clamping device that uses a plurality of ball screw units to generate a mold clamping force.

JP 07-290537 A Japanese Examined Patent Publication No. 06-043068

  In the case of the configuration disclosed in Patent Document 1, a mold clamping force is applied to the entire moving mechanism portion, so that a drive source with a large output is required, and the entire mold clamping apparatus is increased in size. In addition, among the components constituting the moving mechanism, the load is concentrated on components that are weak in strength, and the life of the apparatus tends to be shortened. This is basically the same for the toggle link type. That is, in the case of a mold clamping device using a toggle link mechanism, a large drive source with high output is required, which leads to an increase in the size of the device and an increase in component costs. In addition, since a large load acts on the connecting pins that connect the links to each other, this connecting pin is heavily worn, and it is necessary to use a bushing with a special material or coating, etc. This leads to an increase in the size of the connecting pin.

  Also, in such a direct pressure structure, when burrs or the like occur in the obtained molded product, it is necessary to increase the clamping force or redesign the mold. When the clamping force is increased, the mold life is shortened, and redesigning the mold increases the cost of the molded product.

  In the mold clamping device disclosed in Patent Document 2, variations in quality of individual ball screw units and variations in driving force due to assembly accuracy occur, and the mold clamping force cannot be made uniform. For this reason, although this problem is solved by using together a hydraulic cylinder in patent documents 2, the cost for it will increase.

  The above-described problem does not occur only in the injection molding machine, and there is a possibility that the same problem may occur in a general mold clamping.

  An object of the present invention is to provide a mold clamping method and apparatus capable of simplifying the structure of the mold clamping apparatus. More specifically, an object of the present invention is to provide a mold clamping method and apparatus that are compact, have excellent durability, and do not require a high-power drive source. It is also included in the object of the present invention to provide an injection molding machine incorporating this mold clamping device.

A first aspect of the present invention is a mold clamping method for generating a mold clamping force by pressing a first mold against a second mold, wherein the second mold is moved from the mold opening position to the mold opening position. A step of moving toward the first mold to a mold clamping position further away from the base, and a mold clamping force for transmitting the mold clamping force from the second mold to the base side supporting the mold clamping force. the transmission member, and the clamping position in which the mold clamping force is transmitted to the base side, it is characterized in that the clamping forces equipped and a step of switching to a retracted position not transmitted to the base side .

According to a second aspect of the present invention, the first mold can be switched between a mold opening position and a mold clamping position farther from the base than the mold opening position, and the second mold is in the mold clamping position. A mold clamping method in which a mold clamping force is generated by pressing against the mold, wherein the second mold is moved from the mold opening position to the mold clamping position; and the mold clamping force is applied to the second mold. from the mold clamping force transmitting member for transmitting to the base side to support this clamping force, a clamping position to be interposed between the second mold and the base in the mold clamping position, the clamping force the transfer member is characterized in that comprises the step of switching to a retracted position for retracting from between them.

  In the present invention, when the second mold is pressed against the first mold, the mold clamping force transmission member that transmits the mold clamping force to the base side can be switched from the mold clamping position to the retracted position. is there. Specifically, the second mold is switched from the mold opening position to the mold clamping position. Next, the clamping force transmission member at the retracted position is switched to the clamping position, and this clamping force transmission member is interposed between the base and the second mold at the clamping position, so that the clamping force is on the base side. To be communicated to. Thereafter, the first mold is pressed against the second mold at the mold clamping position to generate a mold clamping force, and in the cavity defined between the first mold and the second mold. Inject molten resin. After the resin molded in the cavity in this way is cooled, the mold is opened. This is done by reversing the previous procedure.

  In the mold clamping method according to the first or second aspect of the present invention, the step of switching the mold clamping force transmission member between the mold clamping position and the retracted position is such that the mold clamping force is transmitted in a direction crossing the direction of the mold clamping force. It may include a step of moving the member.

According to a third aspect of the present invention, a first mold holder to which a first mold is attached, and a second mold so as to be arranged to face the first mold attached to the first mold holder. A second mold holder to which the second mold holder is attached, a holder driving means for driving the second mold holder between a mold opening position and a mold clamping position farther from the base than the mold opening position; A mold clamping force generating means for generating a mold clamping force by pressing the first mold mounted on the first mold holder against the second mold mounted on the two mold holders; A mold clamping force transmitting member for transmitting the mold clamping force generated by the clamping force generating means from the first mold attached to the first mold holder to the base side supporting the mold clamping force, and the mold clamping The clamping force of the force transmission member is the base In mold clamping device, characterized in that the mold clamping force and clamping position transmitted is equipped with a transmission member drive means for switching to a retracted position not transmitted to the base side.

  According to a fourth aspect of the present invention, there is provided a base, a plurality of tie bars protruding parallel to each other from the base, a mold clamping block coupled to the plurality of tie bars and movable along the longitudinal direction thereof. Block driving means for driving the mold clamping block along a longitudinal direction of the plurality of tie bars between a mold clamping position and a standby position farther from the base than the mold clamping position; and the base A first mold holder that is connected to the plurality of tie bars between the mold clamping blocks and is movable along the longitudinal direction thereof, to which a first mold is attached, the base, and the first A second mold holder connected to the plurality of tie bars between the mold holders and movable along the longitudinal direction of the mold holders, to which the second mold is attached, and the second mold holder Holder driving means for driving along the longitudinal direction of the plurality of tie bars between a mold opening position and a mold clamping position farther from the base than the mold opening position; and the mold driving by the block driving means A mold clamping force transmission member for transmitting a mold clamping force applied from the block via the first mold holder and the second mold holder to the base at the mold clamping position; and A mold clamping comprising: a transmission member driving means for driving in a direction intersecting with a longitudinal direction of the plurality of tie bars between a mold clamping position and a retracted position where a mold clamping force is not transmitted In the device.

  In the present invention, the second mold holder in the mold opening position is moved to the mold clamping position by the holder driving means. Next, the mold clamping force transmission member at the retracted position is moved to the mold clamping position by the transmission member driving means, and the mold clamping block at the standby position is driven to the mold clamping position by the block driving means. As a result, the base, the clamping force transmission member, the second mold held by the second mold holder, the first mold held by the first mold holder, and the clamping block overlapped. It becomes a state. The mold clamping force is transmitted from the mold clamping block to the base side via the first mold and the second mold and the mold clamping force transmission member, and the mold clamping between the first mold and the second mold is achieved. Mold opening is performed in the reverse procedure.

  In a specific mold clamping device according to the fourth aspect of the present invention, means for urging the first mold holder away from the mold clamping block and for restricting movement of the first mold holder to the base side The stopper can be further provided.

  The distance between the mold clamping position of the mold clamping block and the standby position is preferably in the range of 0.5 to 3 mm.

  The block driving means includes a screw part formed at the tip of the tie bar, a nut part rotatably attached to the clamping block and screwed into the screw part, and a plurality of drives for driving and rotating the nut parts. And a motor. In this case, the block drive unit may further include a control unit that independently controls the operation of the plurality of drive motors, and each of the plurality of drive motors may be capable of transmitting independent drive torque to the nut portion.

  The mold clamping force transmitting member protrudes from the base in parallel with the plurality of tie bars, and a plurality of mold clamping force receiving members that form a gap with the second mold holder whose tip is in the mold clamping position; A revolving plate attached to the second mold holder so as to be rotatable about an axis parallel to the longitudinal direction of the plurality of tie bars, and a mold clamping force transmission block attached to the revolving plate; The mold holder has a relief portion through which the clamping force receiving member passes at the mold opening position, and the turning plate that is rotated by the transmission member driving means has a clamping force transmission block that is the tip of a plurality of clamping force receiving members. The mold clamping position facing the surface and the opening end face of the escape portion of the second mold holder and the retraction position where the mold clamping force transmission block is shifted to the side of the plurality of mold clamping force receiving members are switched. It's okay. In this case, the length of the clamping force transmission block is such that the distance between the front end surface of the clamping force receiving member and the opening end surface of the relief portion of the second mold holder at the clamping position is along the longitudinal direction of the plurality of tie bars. It is preferable that the setting is wider. Further, the clamping force receiving member may be held so as to be displaceable along the longitudinal direction of the plurality of tie bars with respect to the revolving plate.

  The clamping force transmission member is attached to a plurality of tie bars, notches formed in the tie bars, and a second mold holder so as to be rotatable around an axis parallel to the longitudinal direction of the plurality of tie bars. The revolving plate having a plurality of engaging blocks provided on the revolving plate, and the revolving plate that is revolved by the transmission member driving means is a mold-clamping position for engaging the engaging block with the notch. And a retreat position where the locking block is removed from the notch portion. In this case, it is preferable that the revolving plate is held so as to be displaceable in a direction parallel to the longitudinal direction of the plurality of tie bars with respect to the second mold holder.

  According to a fifth aspect of the present invention, there is provided an injection apparatus for plasticizing a molding material and injecting the same into a cavity formed in a mold by a predetermined amount, and a mold clamping apparatus according to the third or fourth aspect of the present invention. In an injection molding machine characterized by comprising:

  In the present invention, a cavity defined between the first mold and the second mold in the mold-clamped state is filled with a predetermined amount of a resin material in a molten state as a molding material from the injection device, and cooled. The molded product is taken out from the mold at a later mold opening position.

  According to the mold clamping method of the present invention, it is possible to structurally separate the mold clamping mode in which the mold clamping force is transmitted to the base and the non-clamping mode in which the mold clamping force is not transmitted to the base. As a result, it is possible to eliminate the influence of the mold clamping force in the apparatus structure in the non-clamping mode, that is, to reduce the load on the apparatus structure considering that the mold clamping force is applied, and to simplify the apparatus. . More specifically, the drive means for driving the second mold to the mold opening position and the mold clamping position can be separated from the drive means for generating the mold clamping force, compared to the conventional one. It is possible to use an inexpensive driving source with low output.

  According to the mold clamping apparatus of the present invention, it is possible to use an inexpensive drive source having a lower output than that of the conventional apparatus, and the entire apparatus can be made compact.

  When the distance between the mold clamping position and the standby position of the mold clamping block is set within the range of 0.5 to 3 mm, the time required to switch the mold clamping block between the mold clamping position and the standby position is shortened, which shortens the molding cycle. Accordingly, the cost of the molded product can be reduced.

  When the block drive means has a screw part, a nut part, and a plurality of drive motors that drive and rotate these nut parts, it becomes possible to use a cheaper low-power drive motor, further reducing the component cost. be able to. In particular, when the block drive means further includes a control unit that independently controls the operation of the plurality of drive motors, and each of the plurality of drive motors can transmit independent drive torque to the nut portion, the first mold and the second mold The surface pressure distribution on the contact surface with the mold can be arbitrarily finely adjusted. As a result, it is possible to prevent burrs generated in the molded product without redesigning the mold, and to smoothly release the gas from the cavity when the molten resin is filled.

  When the mold clamping force transmission block is switched between the mold clamping position and the retracted position shifted to the side of the mold clamping force receiving member, the mold clamping force is transferred from the second mold holder through the mold clamping force transmission block. It can be transmitted to the fastening force receiving member. In addition, the distance between the front end surface of the clamping force receiving member and the opening end surface of the relief portion of the second mold holder at the clamping position is set wider than the length of the clamping force transmission block along the longitudinal direction of the tie bar. In this case, the mold clamping force transmission block can be reliably moved to the mold clamping position. In particular, when the mold clamping force receiving member is held so as to be displaceable along the longitudinal direction of the tie bar with respect to the swivel plate, the mold clamping force does not act on the swivel plate, thereby preventing deformation of the swivel plate in advance. it can.

  When the swivel plate can be switched between the mold clamping position where the locking block is locked to the notch part and the retracted position where it is detached from the notch part, the clamping force is applied from the second mold holder. It can be transmitted to the tie bar via the stop block and the notch. In particular, when the revolving plate is held so as to be displaceable in the direction parallel to the longitudinal direction of the tie bar with respect to the second mold holder, the clamping force does not act on the revolving plate, thereby preventing deformation of the revolving plate. be able to.

  According to the injection molding machine of the present invention, a compact and low-cost injection molding machine can be obtained.

It is a three-dimensional projection figure showing the external appearance of the front side of one Embodiment of the injection molding machine by this invention. It is a three-dimensional projection figure showing the external appearance of the back side of embodiment shown in FIG. FIG. 2 is a three-dimensional projection diagram illustrating the embodiment illustrated in FIG. 1 in an exploded state. It is a control block diagram of the principal part in embodiment shown in FIG. FIG. 2 is a three-dimensional projection view showing a part of the block driving means in the embodiment shown in FIG. It is the three-dimensional projection figure which extracted and expanded the external appearance of the part of the stationary mold holder in embodiment shown in FIG. 1, and represents the state by which the stationary mold was removed. FIG. 7 is a plan view of the fixed-side mold holder shown in FIG. 6, showing a state where the fixed-side mold is mounted. It is the three-dimensional projection figure which extracted and expanded the external appearance of the part of the movable mold holder in embodiment shown in FIG. 1, and represents the state by which the movable mold was removed. FIG. 9 is a plan view of the movable side mold holder shown in FIG. 8, showing a state where the movable side mold is mounted. In the embodiment shown in FIG. 1, it is sectional drawing showing the relative positional relationship of a mold clamping force transmission block and the movable mold holder in a mold opening position. It is the three-dimensional projection figure which extracted and expanded the external appearance of the movable mold holder in the mold opening position shown in FIG. In the embodiment shown in FIG. 1, it is the three-dimensional projection figure which expanded and extracted the external appearance of the movable side mold holder which rose to the mold clamping position with the mold clamping force transmission member in a retracted position. In the embodiment shown in FIG. 1, it is sectional drawing showing the relative positional relationship of the clamping force transmission block in a mold clamping position, and a movable mold holder. It is the three-dimensional projection figure which extracted and expanded the external appearance of the movable side mold holder in the mold clamping position shown in FIG. It is a flowchart showing the procedure of the injection molding operation | work in embodiment shown in FIG. It is the three-dimensional projection figure showing the external appearance of the back side of the principal part in other embodiment of the injection molding machine by this invention, and has shown the mold open state. FIG. 17 is a three-dimensional projection view showing a state where the movable mold holder is raised to the mold clamping position and the mold clamping force transmission member is in the retracted position in the embodiment shown in FIG. 16. In the embodiment shown in FIG. 16, it is a three-dimensional projection view showing a state where both the movable mold holder and the mold clamping force transmission member are in the mold clamping position, and shows a state viewed from the back side. It is a bottom view of the mold clamping force transmission member in the embodiment shown in FIG.

  An embodiment in which an injection molding machine according to the present invention is applied to a vertical molding machine will be described in detail with reference to FIGS. However, the present invention is not limited to such an embodiment, and the horizontal type and the configuration of the part of the clamping device may be incorporated into other types of molding machines as necessary, or belong to the spirit of the present invention. Needless to say, the present invention can be applied to any other technology.

  The appearance on the front side of the injection molding machine in this embodiment is shown in FIG. 1, the appearance on the back side is shown in FIG. 2, these are shown in an exploded state in FIG. 3, and the control block of the main part is shown in FIG. . That is, the injection molding machine 10 of the present embodiment includes an injection device 13 for injecting a plasticized resin material into a cavity (not shown) formed between the fixed mold 11 and the movable mold 12, The mold clamping device 14 is the subject of the invention.

  The injection device 13 includes an injection unit 15 and a supply unit 16. The injection unit 15 has a function of plasticizing a molding material, for example, a resin material, and injecting the plastic material into the cavities (molding spaces defined in the molds) of the molds 11 and 12 by a predetermined amount. The supply unit 16 has a function of supplying a new resin material to the injection unit 15 by a predetermined amount as the resin material is consumed in the injection unit 15.

  The injection unit 15 includes an injection cylinder 17 to which a resin material is supplied, a heater 18 for heating the periphery of the injection cylinder 17, a plunger 19 for injecting a plasticized resin material, and a plunger driving device 20. Have The heater 18 is for promoting plasticization of the resin material inside the injection cylinder 17. The plunger driving device 20 reciprocates the plunger 19 with respect to the injection cylinder 17 and injects a predetermined amount of plasticized resin material from the nozzle 17a at the tip (lower end in the illustrated example) of the injection cylinder 17.

  The plunger drive device 20 in this embodiment includes an injection motor 21, a speed reducer 22, and an elevating mechanism 23, and the basic configuration thereof is well known in Japanese Patent Application Laid-Open No. 2006-289852, etc. Any other configuration can be adopted.

  The raising / lowering mechanism 23 in this embodiment has the raising / lowering board 23a by which the upper end part of the plunger 19 is connected detachably via the connector which is not shown in figure, the ball nut part 23b, and the ball screw axial part 23c. A pair of support columns 24 project vertically upward from a mold clamping block 25 described later, and upper ends thereof are integrally connected via a bracket 26.

  On the bracket 26, a ball screw shaft portion 23c having a driven sprocket 27 attached to the upper end portion is rotatably supported. The ball nut portion 23b that is screwed into the ball screw shaft portion 23c is held up and down freely with respect to the bracket 26 via a detent mechanism 23d, and the lower end of the ball nut portion 23b can move up and down along the pair of support columns 24. It is connected to the plate 23a.

  An injection motor 21 for driving the plunger 19 and a speed reducer 22 connected to the injection motor 21 are attached to a bracket 26. An endless toothed belt 28 is wound around the drive sprocket 22 a that is the output end of the speed reducer 22 and the driven sprocket 27.

  Accordingly, the forward / reverse operation of the injection motor 21 is transmitted from the speed reducer 22 to the ball screw shaft portion 23c via the toothed belt 28, and the lifting / lowering operation of the lifting plate 23a integrated with the ball nut portion 23b, that is, the plunger 19 is performed. Is converted to reciprocating motion. The ascending end and descending end of the elevating plate 23a are detected by a pair of limit switches 29a and 29b attached to an injection jacket 16a described later. The stop of the injection motor 21 and the switching between forward and reverse operations are controlled via a control unit 30 described later.

  The supply unit 16 includes an injection jacket 16a, a feeder 16b, and a hopper 16c attached to a pair of support columns 24 so as to be movable up and down between a mold clamping block 25 and a lifting plate 23a described later. The feeder 16b is for supplying a predetermined amount of resin material into the injection cylinder 17 through the injection jacket 16a.

  A feeder 16b is connected to an injection jacket 16a connected to and supporting the injection cylinder 17, and a hopper 16c for storing a pellet-like resin material and supplying it to the feeder 16b is attached to the feeder 16b. ing. Note that a material presence / absence detection sensor 16d for detecting the presence / absence of the resin material flowing down is provided at a portion of the feeder 16b immediately below the hopper 16c.

  The mold clamping device 14 performs mold clamping of the fixed mold 11 as the first mold and the movable mold 12 as the second mold in the present invention when the plasticized resin material is injected by the injection apparatus 13. On the other hand, the mold is opened when the molded product is taken out. The mold clamping device 14 includes a base 31, a tie bar 32, a mold clamping block 25, a block driving means 33, a fixed side mold holder 34, a movable side mold holder 35, a holder driving means 36, and a mold clamping. A force transmission member 37 and a transmission member driving means 38 are provided.

  The mold clamping block 25 is connected to the upper ends of a plurality of (four in the illustrated example) tie bars 32 that protrude perpendicularly from the base 31 in parallel with each other, and move up and down with respect to the base 31 along their longitudinal directions Is possible. The nozzle 17a of the injection cylinder 17 is positioned on and supported by the bottom surface 25a of the mold clamping block 25 facing the receiving surface 11a of the fixed mold 11 to be described later. Therefore, the injection cylinder 17 is interlocked with the raising / lowering operation of the clamping block 25 together with the injection jacket 16a.

  The block driving means 33 includes a plurality of clamping blocks 25 between a clamping position (see FIG. 13) and a standby position (see FIGS. 1 and 2) farther from the base 31 than the clamping position. This is for driving along the longitudinal direction of the tie bar 32. FIG. 5 shows an enlarged and extracted structure of the main part of the block driving means 33 which is a mold clamping force generating means in the present invention.

  The block drive means 33 in this embodiment includes a ball screw portion 32a, a ball nut portion 39, a speed reducer 40, and a plurality (four in the illustrated example) of mold clamping motors 41. The ball screw portion 32a is formed at the tip end portion (the upper end portion in the illustrated example) of the tie bar 32, and is screwed into the ball nut portion 39 that is rotatably mounted in the mold clamping block 25 via the thrust bearing 42. Match.

  Further, the speed reducer 40 in the present embodiment is a planetary gear type speed reducer, and a carrier 40b that rotatably supports the planetary gear 40a is integrally fixed to the ball nut portion 39, and is clamped via an angular bearing 43. 25 is held rotatably. The planetary gear 40a meshes with the sun gear 40c attached to the mold clamping motor 41 and the internal gear 40d fixed to the mold clamping block 25, and an extremely large reduction ratio is obtained.

  Further, the control unit 30 in the present embodiment independently controls the operation of a plurality of mold clamping motors 41 that respectively drive and rotate the ball nut portions 39 via the speed reducer 40.

  Accordingly, the plurality of mold clamping motors 41 can transmit independent driving torques to the ball nut portion 39. In the present embodiment, since the reduction ratio by the reduction gear 40 is set to be large for the purpose of obtaining a large mold clamping force, each mold clamping motor 41 is significantly reduced in size and output than the conventional one. It is possible to significantly reduce the cost of parts for that purpose. In this case, since the molding cycle can be shortened as the distance between the mold clamping position of the mold clamping block 25 and the standby position is set shorter, it is possible to set these distances within a range of, for example, 0.5 to 3 mm. preferable.

  Encoders 41 a are respectively attached to the mold clamping motor 41, and rotation information thereof is output to the control unit 30. These encoders 41a detect the rotational axis of the mold clamping motor 41, that is, the rotational speed of the sun gear 40c, and the control unit 30 calculates the elevation position of the mold clamping block 25 based on this detection information.

  Further, the control unit 30 detects the current value supplied to the mold clamping motor 41 and calculates an average value thereof, so that the current values of the individual mold clamping motors 41 are the same. The rotational speed of the rotating shaft (sun gear 40c) of the motor 41 is controlled. Thereby, even if the molds 11 and 12 are inclined with respect to the clamping direction parallel to the longitudinal direction of the tie bar 32, the pressure distribution applied to the parting surfaces 11b and 12b of the molds 11 and 12 is made uniform. Can be controlled.

  When it is desired to partially increase the pressure, the pressure can be increased by increasing the current value of the corresponding mold clamping motor 41, and vice versa. This is effective to prevent the occurrence of burrs when burrs occur in the molded product only when a specific set of dies is used when there are multiple sets of molds for molding the same molded product. . Further, in the case where burrs are generated in the molded product, the generation of burrs can be prevented without redesigning the molds 11 and 12. Such independent control of the mold clamping motor 41 can be used not only to prevent the occurrence of burrs in the molded product, but also to let the gas escape from the cavity when the plasticized resin is injected.

  Further, when the mold clamping motor 41 is configured by a stepping motor, the surface pressure distribution of the molds 11 and 12 can be easily made uniform. Specifically, the individual mold clamping motors 41 may be stepped out, the drive pulses for the mold clamping motors 41 are all set to be the same from that position, and these may be driven with a predetermined torque. When the mold clamping motor 41 is controlled independently, it is also possible to control each driving torque with higher accuracy by using a strain sensor or an optical position detection sensor together.

  The origin position of each mold clamping motor 41 is set to a position where the fixed mold 11 and the nozzle 17a of the injection cylinder 17 come into contact with each other with a predetermined pressure. This origin position is set by stepping out the synchronization of the mold clamping motor 41 based on the information from each encoder 41a and the current value.

  When the mold clamping block 25 is lowered from the standby position to the mold clamping position, the injection cylinder 17 supported on the mold clamping block 25 is also lowered along with the injection jacket 16 a along the support column 24. The tip of the nozzle 17a of the injection cylinder 17 and the sprue 11c of the fixed mold 11 are in contact with each other, and the bottom surface 25a of the mold clamping block 25 is in contact with the receiving surface 11a of the fixed mold 11, so that the mold clamping force is increased. It is transmitted to the fixed side mold 11.

  The fixed mold 11 is detachably attached to the fixed mold holder 34 as the first mold holder in the present invention, and the movable mold 12 is mounted to the movable mold holder 35 as the second mold holder. Is removably attached. The mold holders 34 and 35 on the fixed side and the movable side are slidably connected to the plurality of tie bars 32 between the base 31 and the mold clamping block 25, and are vertically moved along the longitudinal direction thereof. It can be moved freely. The appearance of the fixed side mold holder 34 is extracted and enlarged and shown in FIG. 6, and its planar shape is shown in FIG. Further, the external appearance of the movable side mold holder 35 is extracted and enlarged and shown in FIG. 8, and its planar shape is shown in FIG.

  The fixed mold 11 and the movable mold 12 in the present embodiment having a rectangular plate shape include a parting surface 11b, 12b that defines a cavity (not shown), and receiving surfaces 11a, 12a on the opposite side thereof. Have These fixed-side and movable-side molds 11 and 12 are detachable from the fixed-side mold holder 34 and the movable-side mold holder 35, respectively, along a horizontal direction orthogonal to the longitudinal direction of the tie bar 32. .

  The molds 11 and 12 include front surface parts 11d and 12d on the front side in the attaching / detaching direction with respect to the corresponding mold holders 34 and 35, rear surface parts 11e and 12e on the opposite side, and a pair of side surface parts 11f, 11g, 12f, and 12g. And further. The pair of side surface portions 11f, 11g, 12f, and 12g extend along the direction in which the molds 11 and 12 are attached to and detached from the mold holders 34 and 35. First and second alignment surfaces 11E, 12E, 11F, and 12F are formed on one side surface portions 11f and 12f and the rear surface portions 11e and 12e of the molds 11 and 12, respectively. Furthermore, inclined surfaces 11G and 12G that are inclined with respect to the attaching / detaching direction are formed at the end portions of the other side surface portions 11g and 12g on the front surface portions 11d and 12d side.

  The mold holders 34 and 35 on the fixed side and the movable side include holder bodies 34a and 35a, first and second alignment reference portions 34E, 34F, 35E and 35F, a movable member 44, and a spring biasing means 45. And has.

  The first and second alignment reference portions 34E, 34F, 35E, 35F are provided on the holder main bodies 34a, 35a, and the first and second alignment surfaces 11E, 12E, 11F, 12F of the molds 11, 12 are provided. Are in contact with each other. The movable member 44 is attached to the holder main bodies 34a and 35a so as to be displaceable along the opposing direction of the pair of side surface portions 11f, 11g, 12f and 12g of the molds 11 and 12 attached to the mold holders 34 and 35. .

  The movable member 44 is formed with a pressing portion 44a that contacts the inclined surfaces 11G and 12G of the molds 11 and 12. In the present embodiment, the movable member 44 is rotatable via a pin 46 parallel to the longitudinal direction of the tie bar 32. The spring urging means 45 is incorporated between the movable member 44 and the holder main bodies 34a and 35a, respectively, and the inclined portions of the molds 11 and 12 mounted on the mold holders 34 and 35 with the pressing portions 44a of the movable member 44 mounted thereon. Spring forces that press against the surfaces 11G and 12G are generated. As a result, the first and second alignment surfaces 11E, 12E, 11F, and 12F of the molds 11 and 12 are pressed against the first and second alignment reference portions 34E, 34F, 35E, and 35F, and the molds are pressed. The molds 11 and 12 are positioned with respect to the holders 34 and 35.

  The movable member 44 in the present embodiment includes a detachment prevention portion 44b that is engaged with the end portions on the inclined surfaces 11G and 12G side of the front surface portions 11d and 12d of the molds 11 and 12 housed in the mold holders 34 and 35, The insertion guide surface 44c, the handle portion 44d, and the escape portion 44e are provided. The disconnection prevention portion 44b prevents the molds 11 and 12 from being inadvertently detached from the mold holders 34 and 35 by using the spring force of the previous spring biasing means 45.

  When the molds 11 and 12 are inserted into the mold holders 34 and 35, the insertion guide surface 44c comes into contact with the end portions on the rear surface parts 11e and 12e side of the other side surface parts 11g and 12g of the molds 11 and 12, It has a function of retracting the movable member 44 against the biasing force of the spring biasing means 45. That is, the operator does not operate the movable member 44 by grasping the handle portion 44d, and simply pushes the molds 11 and 12 into the mold holders 34 and 35, so that the molds 11 and 12 are inserted into the mold holders 34 and 35. Can be worn.

  The handle portion 44d is for releasing the engagement of the detachment prevention portion 44b with respect to the inclined surfaces 11G, 12G side ends of the front surface portions 11d, 12d of the fixed mold 11, and the mold holders 34, 35. This is used when the molds 11 and 12 are taken out from the mold.

  The escape portion 44e is movable in a state where the escape prevention portion 44b is engaged with the end portions on the inclined surfaces 11G and 12G side of the front surfaces 11d and 12d of the molds 11 and 12 accommodated in the mold holders 34 and 35. This is to keep the member 44 in a non-contact state with respect to the tie bar 32. Thereby, the smooth raising / lowering operation | movement of the metal mold | die holders 34 and 35 along the tie bar 32 can be ensured.

  Note that the first alignment reference portion 35E of the movable mold holder 35 in the present embodiment can be rotated around an axis parallel to the longitudinal direction of the tie bar 32 as the movable mold 12 is attached and detached. The roller 47 is provided. The pair of rollers 47 are rotatably held by the holder main body 35a so as to be spaced apart from each other along the attaching / detaching direction of the movable mold 12 with respect to the movable mold holder 35. Thereby, the attaching / detaching operation of the movable mold 12 with respect to the movable mold holder 35 can be easily performed with a smaller force.

  The tie bar 32 is provided with a stopper 48 for restricting the movement of the fixed mold holder 34 toward the base 31 side. Therefore, the fixed mold holder 34 cannot be lowered below the stopper 48, and this is the lower end position of the fixed mold holder 34 in the mold open state (FIGS. 1 and 2). Reference).

  For example, in the present embodiment, a spring member 49 is disposed between the mold clamping block 25 and the fixed mold holder 34 to urge the fixed mold holder 34 toward the lowered end position. A gap is formed between the receiving surface 11a of the stationary mold 11 held by the stationary mold holder 34 at the lowered end position and the bottom surface 25a of the mold clamping block 25 at the standby position. As a result, the nozzle 17a at the lower end of the injection cylinder 17 is in a non-contact state with respect to the sprue 11c that opens on the receiving surface 11a of the stationary mold 11.

  In the movable mold holder 35, an ejector plate 50 movably held along the longitudinal direction of the tie bar 32 is accommodated so as to face the receiving surface 12 a of the movable mold 12. A plurality of (two in the illustrated example) ejector pins 51 that pass through the movable mold holder 35 and protrude toward the base 31 are fixed to the ejector plate 50.

  When the movable mold holder 35 is in the mold opening position (FIGS. 1 and 2), the lower ends of these ejector pins 51 abut against the base 31. And as a result of pushing up the ejector plate 50 to the receiving surface 12a side of the movable mold 12 held by the movable mold holder 35, the molded product is discharged from the cavity. FIG. 10 shows a cross-sectional structure of the movable mold holder 35 in the mold opening position together with the fixed mold holder 34, and FIG. 11 shows a partially broken external view of the movable mold holder 35 in this state. The movable mold holder 35 has an escape portion 35b through which a mold clamping force receiving member 52 described later passes at the mold opening position.

  FIG. 12 shows the appearance of the movable mold holder 35 in the mold clamping position with respect to the mold clamping force transmission member 37 in the retracted position (see FIG. 11). FIG. 13 shows a cross-sectional structure of the movable mold holder 35 in a state where both the movable mold holder 35 and the mold clamping force transmission member 37 are in the mold clamping position, and the appearance of the movable mold holder 35 in this state. Is shown in FIG.

  The holder driving means 36 drives the movable mold holder 35 along the longitudinal direction of the plurality of tie bars 32 between a mold opening position and a mold clamping position farther from the base 31 than the mold opening position. Is.

  The holder driving means 36 in this embodiment includes an opening / closing motor 36a, a driving sprocket 36b, a driven sprocket 36c, and an endless toothed belt 36d wound around the driving sprocket 36b and the driven sprocket 36c. A forward / reversible opening / closing motor 36a to which a drive sprocket 36b is attached via a speed reducer 36e is installed on the base 31, and rotation information of the drive sprocket 36b is detected by an encoder 36f and output to the control unit 30.

  Further, the control unit 30 controls the operation of the opening / closing motor 36a based on the information of the encoder 36f, and alternately switches the movable mold holder 35 between its mold opening position and mold clamping position. The driven sprocket 36c is rotatably held above the base 31 via a bracket (not shown) in parallel with the drive sprocket 36b attached to the opening / closing motor 36a.

  A part of the toothed belt 36 d is fixed to the connecting portion 35 c of the movable mold holder 35. Therefore, the movable mold holder 35 is moved between the mold opening position shown in FIGS. 1 and 2 and the mold clamping position shown in FIG. 13 between the drive sprocket 36b and the driven sprocket 36c by a relatively simple lifting mechanism. It is possible to move up and down smoothly and quickly. That is, the mold clamping device 14 of the present embodiment can obtain a very large reduction ratio by the speed reducer 40 and ensure a predetermined mold clamping force during mold clamping. Although details will be described later, before or after the mold opening, the effect of the mold clamping force is excluded, and the movable side mold holder 35 approaches or retracts smoothly and quickly with respect to the fixed side mold holder 34. be able to.

  When the movable mold holder 35 rises from the mold opening position to the mold clamping position, the movable mold is placed on the parting surface 11b of the fixed mold 11 of the fixed mold holder 34 held by the stopper 48 on the way. The parting surface 12b of the mold 12 is pressed against. The fixed mold 11 and the fixed mold holder 34 that accommodates the fixed mold 11 are raised together with the movable mold 12 to the mold clamping position. In a state in which the movable mold holder 35 is in the mold clamping position, the sprue 11c of the fixed mold 11 is in contact with the nozzle 17a of the injection cylinder 17 supported by the mold clamping block 25 or at a minute interval. It becomes.

  The mold clamping force transmission member 37 transmits the mold clamping force applied from the mold clamping block 25 via the fixed mold holder 34 and the movable mold holder 35 to the base 31 at the mold clamping position by the block driving means 33. Is to do.

  The mold clamping force transmission member 37 in the present embodiment includes a plurality of (three in the illustrated example) mold clamping force receiving members 52, a swivel plate 53, and a plurality of (three in the illustrated example, three). ) Mold clamping force transmission block 54.

  The mold clamping force receiving member 52 protrudes from the base 31 in parallel with the tie bar 32 and forms a gap with the movable mold holder 35 whose upper end surface is at the mold clamping position. The position, number, size, and the like of the mold clamping force receiving member 52 are set in consideration of balance and rigidity with respect to the mold clamping force received from the movable mold holder 35. The swivel plate 53 is supported by the movable mold holder 35 so as to be turnable about an axis parallel to the longitudinal direction of the tie bar 32. The mold clamping force receiving member 52 is held so as to be displaceable along the longitudinal direction of the tie bar 32 with respect to the turning plate 53. Therefore, a plurality of (three in the illustrated example) openings 53a and escape portions 53b through which the mold clamping force receiving member 52 and the ejector pins 51 can respectively penetrate are formed in the revolving plate 53. The gap G between the upper end surface of the mold clamping force receiving member 52 and the opening end surface 35d of the escape portion 35b of the movable mold holder 35 at the mold clamping position is a mold clamping force transmission block 54 along the longitudinal direction of the tie bar 32. Is set wider than the length L. Further, the position of the swivel plate 53 with respect to the movable mold holder 35 along the longitudinal direction of the tie bar 32 is also set appropriately.

  Specifically, in a state where no mold clamping force is applied, the mold clamping force transmission block 54 attached to the opening 53a of the swivel plate 53 has its upper surface and the bottom surface of the movable mold holder 35, that is, A minute gap is formed between the opening end face 35d. Thus, when the turning plate 53 is turned from the retracted position to the mold clamping position, the mold clamping force transmission block 54 collides with or contacts the movable mold holder 35 and the mold clamping force receiving member 52 at the mold clamping position. The accompanying wear can be avoided.

  Conversely, when the swivel plate 53 is swung from the retracted position to the mold clamping position while the movable mold holder 35 and the mold clamping force receiving member 52 are in contact with the mold clamping force transmission block 54, It is useful to incorporate some means to avoid these wears. In the present embodiment, after the mold clamping block 25 starts to rise to the standby position, the turning plate 53 is turned from the retracted position to the mold clamping position. For this reason, it is possible to avoid large wear due to strong contact between the mold clamping force transmission block 54, the movable mold holder 35 and the mold clamping force receiving member 52.

  The mold clamping force transmission block 54 includes a mold clamping position facing the upper end surface of the mold clamping force receiving member 52 and the opening end surface 35d of the escape portion 35b of the movable mold holder 35, and a side of the mold clamping force receiving member 52. It can be switched to the retracted position. This switching is performed by turning the turning plate 53 by the transmission member driving means 38. That is, the transmission member driving means 38 drives the mold clamping force transmission member 37 in a direction intersecting the longitudinal direction of the tie bar 32 between the mold clamping position and the retracted position where the mold clamping force is not transmitted.

  The transmission member drive means 38 in the present embodiment includes a turning motor 38a capable of forward and reverse rotation, a fan gear 38c that meshes with a drive gear 38b attached to the turning motor 38a, and a turning amount detection sensor 38d.

  The turning motor 38 a is attached to the movable mold holder 35, and the fan gear 38 c is provided on a part of the outer peripheral surface of the turning plate 53. The turning amount detection sensor 38d is also attached to the movable mold holder 35 and faces the outer peripheral surface of the turning plate 53. On the outer peripheral surface of the swivel plate 53 facing the swivel amount detection sensor 38d, slits (not shown) are formed in a gear shape at regular intervals along the circumferential direction. The turning amount detection sensor 38d detects the amount of rotation of the turning plate 53 by counting the passage of the slits. Therefore, the forward / reverse rotation direction of the turning motor 38a is switched based on the detection signal from the turning amount detection sensor 38d, and the mold clamping force transmission block 54 is moved in a direction intersecting the direction of the mold clamping force. Switch between the mold clamping position and the retracted position. It is also possible to use a touch sensor as the turning amount detection sensor 38d and attach a pair of dogs corresponding to the mold clamping position and the retracted position to the turning plate 53.

  The control unit 30 also includes a heater 18, an injection motor 21, a feeder 16b, a mold clamping motor 41, an opening / closing motor 36a, a turning motor 38a, and the like so that the injection molding machine 10 can perform smooth molding. Control the operation. This is based on detection signals from switches provided on an operation panel (not shown), limit switches 29a and 29b, material presence / absence detection sensor 16d, encoders 36f and 41a, turning amount detection sensor 38d, and the like. Executed according to In particular, in the present embodiment, the control unit 30 constantly monitors the current values flowing through the motors 21, 41, 36a, and 38a. If this value exceeds a preset value, it is determined that some abnormality has occurred and the injection is performed. The work is to be stopped.

  The operation procedure of the injection molding machine 10 is shown in the flowchart of FIG. That is, in the initial state, the plunger 19 is at the rising end, the mold clamping block 25 is at the standby position, the movable mold holder 35 is at the mold opening position, and the turning plate 53 is at the retracted position.

  From this state, in step S11, the opening / closing motor 36a rotates forward to raise the movable mold holder 35 from the mold opening position. In step S12, it is determined based on information from the encoder 36f whether or not the parting surface 12b of the movable mold 12 and the parting surface 11b of the fixed mold 11 are in contact with each other. This determination step of S12 is repeated until the movable mold 12 reaches the contact position with the fixed mold 11.

  Thus, when it is determined that the movable mold 12 has reached the contact position with the fixed mold 11, whether or not the movable mold holder 35 has been raised to the mold clamping position in step S13. Determine whether. If it is determined that the movable mold holder 35 has not been raised to the mold clamping position, the process proceeds to step S14 to determine whether or not an abnormal torque, that is, an excessive current is flowing in the opening / closing motor 36a. If there is nothing, the process returns to step S13.

  When an abnormal torque is generated in the opening / closing motor 36a in step S14, that is, when some trouble is expected, for example, foreign matter is interposed between the movable mold 12 and the fixed mold 11 In step S15, an abnormality process is performed to stop the injection work.

  The abnormality process in the step S15 includes an operation of returning the movable mold 12 and the fixed mold 11 to the initial positions by stopping the opening / closing motor 36a and subsequent reverse rotation. Further, it may include a process of warning the operator using visual means or a sound using a display (not shown) that an abnormality has occurred at the same time. The operator removes the movable and fixed molds 11 and 12 that have returned to the initial state from the holders 34 and 35 as necessary, and checks the condition of the molds 11 and 12 to remove foreign matters. Then, the mold is repaired and replaced as necessary, and the molding operation is resumed.

  When the movable mold holder 35 is raised to the mold clamping position without any problem, the turning motor 38a is rotated forward in step S16, and the mold clamping at the retracted position is based on the information from the turning amount detection sensor 38d. The force transmission block 54 is moved to the mold clamping position. Then, when the mold clamping force transmission block 54 moves to the mold clamping position, the process proceeds to step S17, the mold clamping motor 41 is rotated forward, and the mold clamping block 25 in the standby position is lowered to the mold clamping position. At the same time, the power supply to the opening / closing motor 36a is stopped. Thus, the movable mold holder 35 is supported by the mold clamping force receiving member 52 via the mold clamping force transmitting member 37.

  Following the forward rotation of the mold clamping motor 41 in step S17, it is determined in step S18 based on the detection signal from the encoder 41a whether the mold clamping block 25 has been lowered to the mold clamping position. Here, if it is determined that the mold clamping block 25 has not reached the mold clamping position, the process proceeds to step S19 to check whether an abnormal torque, that is, an excessive current is flowing in any of the mold clamping motors 41. Determine. If there is nothing, the mold clamping motor 41 continues to rotate normally, and the determination routine of S18 is repeated.

  In step S19, an abnormal torque is generated in at least one mold clamping motor 41, that is, there is a problem such as a foreign object interposed between the mold clamping block 25 and the stationary mold 11. If predicted, the process proceeds to step S20.

  In step S20, an abnormality process corresponding to this is performed to stop the injection work. This abnormality process includes an operation of returning the mold clamping block 25 to the initial standby position by stopping the mold clamping motor 41 and subsequent reverse rotation. Further, it may include a process of warning the operator using visual means or a sound using a display (not shown) that an abnormality has occurred at the same time. The operator restarts the molding operation by taking measures according to the situation such as inspecting the gap between the mold clamping block 25 that has returned to the initial state and the fixed mold 11 to remove foreign matter.

  If it is determined in step S18 that the mold clamping block 25 has been lowered to the mold clamping position based on the detection signal from the encoder 41a, the process proceeds to step S21 to control the driving torque of the mold clamping motor 41. To do. Then, the fixed mold 11 held by the fixed mold holder 34 is pressed against the movable mold 12 held by the movable mold holder 35 at the mold clamping position, and a desired mold clamping force is obtained. generate. In this case, since the mold clamping force transmission block 54 is movable relative to the opening 53a of the swivel plate 53, the mold clamping force applied to the mold clamping force transmission block 54 is not transmitted to the swivel plate 53, and the swivel plate Inconveniences such as 53 bending do not occur.

  Thereafter, the process proceeds to step S22 to perform injection and cooling processing. This injection and cooling process includes an operation of driving the injection motor 21 in the normal direction to move the elevating plate 23a located at the rising end to the lowering end. Further, it includes an operation of injecting the resin material in the injection cylinder 17 from the nozzle 17a into a cavity defined by the fixed mold 11 and the movable mold 12 while plasticizing the resin material. As a result, the molten resin is set in advance and filled into the cavity at the injection pressure and the injection speed, resulting in a molded product. Further, this injection and cooling process is performed by driving the injection motor 21 reversely after a predetermined time when the resin material injected into the cavity is cooled and solidified, and based on the detection information from the limit switch 29a, the lifting plate located at the lower end The operation includes returning 23a to its rising end. In addition to this, an operation of operating the feeder 16b to supply a predetermined amount of molding material into the injection cylinder 17 is also included.

  Subsequent to step S22, energization of the mold clamping motor 41 is stopped in step S23, and the driving torque that generated the mold clamping force is released. Thereafter, in step S24, the mold clamping motor 41 is reversely rotated to raise the mold clamping block 25 from the mold clamping position to the standby position. In step S25, the turning motor 38a is reversely rotated to return the mold clamping force transmission block 54 at the mold clamping position to the retracted position. In this case, since the mold clamping block 25 is being raised to its standby position, friction due to contact between the mold clamping force transmission block 54, the movable mold holder 35 and the mold clamping force receiving member 52 is avoided.

  When the swivel plate 53 returns to the retracted position, the process proceeds to step S26, where the open / close motor 36a is reversed to lower the movable mold holder 35 to the mold opening position. In the middle of the lowering, the lowering of the fixed side mold holder 34 is restricted by the stopper 48, and the parting surface 11b of the fixed side mold 11 and the parting surface 12b of the movable side mold 12 continuing to descend are separated from each other. Opened.

  Following the step of S26, when the movable mold holder 35 reaches the mold opening position, the process proceeds to the step of S27, and the molded product is taken out. More specifically, the molded product is pushed up from the movable mold 12 by the action of the ejector pin 51 and the ejector plate 50 to which the ejector pin 51 is connected, and the molded product and the runner connected thereto are moved by the movable arm using a robot arm (not shown). It is removed from the mold 12.

  In the embodiment described above, a plurality of mold clamping force receiving members 52 are projected from the base 31 in parallel with the longitudinal direction of the tie bar 32. However, the movable mold holder 35 is locked to the tie bar 32 at the mold clamping position. The mold clamping force may be transmitted to the tie bar 32 side. In this case, the mold clamping force receiving member 52 can be omitted.

  The appearance of the back side of the main part of another embodiment according to the present invention is shown in FIGS. 11 and 13, the appearance of the front side is shown in FIG. 12, and the planar shape of the swivel plate 53 is shown in FIG. Elements having the same functions as those of the previous embodiment are denoted by the same reference numerals, and redundant description is omitted. 11 shows the mold open state, FIG. 12 shows the state where the revolving plate 53 is in the retracted position with respect to the movable mold holder 35 that has reached the mold clamp position, and FIGS. 13 and 14 show the mold clamp state. Represents.

  The mold clamping force transmission member 37 in this embodiment includes a tie bar 32, a notch 32b formed in the tie bar 32, a swivel plate 53, and a plurality (four in the illustrated example) provided on the swivel plate 53. ) Locking block 55.

  The notches 32b formed in each of a plurality (four in the illustrated example) of tie bars 32 have a circular cross section along the circumferential direction centering on the rotation axis of the swivel plate 53 parallel to the longitudinal direction of the tie bars 32. It is formed by cutting out a part of the outer peripheral surface of the tie bar 32.

  When the movable mold holder 35 is in the mold clamping position, the hook-shaped locking block 55 can be engaged with the notch portion 32b by one-way turning operation of the turning plate 53, and by turning operation in the opposite direction. The engaged state can be released.

  The revolving plate 53 revolving by the transmission member driving means 38 is switched between a mold clamping position where the engaging block 55 is engaged with the notch 32b and a retracted position where the engaging block 55 is removed from the notch 32b. .

  The revolving plate 53 in the present embodiment, which is rotatably held by the movable side mold holder 35, has an annular shape in which the ejector pin 51 passes through the center portion thereof, and a plurality of the protruding plates 53 protrude from the lower end surface of the movable side mold holder 35. It is supported by the support pins 56 (three in the illustrated example).

  Further, a locking block 55 corresponding to the mold clamping force transmission block 54 in the previous embodiment is integrally fixed to the turning plate 53 on the outer peripheral portion of the turning plate 53. Further, the revolving plate 53 is formed with a long hole 53c having an arc shape for allowing the rotation of the revolving plate 53 relative to the support pin 56 by the transmission member driving means 38. Thereby, the swivel plate 53 can be displaced with respect to the movable mold holder 35 in a direction parallel to the longitudinal direction of the tie bar 32. That is, in a state where the clamping force is not applied to the locking block 55, the swivel plate 53 is at a position farthest from the movable side mold holder 35 due to its own weight. In this state, the upper end surface of the locking block 55 is a minute gap with respect to the bottom surface of the movable mold holder 35, that is, the opening end surface 35 h below the tie bar insertion hole 35 g formed in the movable mold holder 35. Is formed. However, when the locking block 55 is locked to the notch 32 b of the tie bar 32 and the clamping force is applied to the movable mold holder 35, the movable mold holder 35 is pushed down relative to the revolving plate 53. It is done. As a result, the lower opening end surface 35 h of the tie bar insertion hole 35 g formed in the movable mold holder 35 presses against the locking block 55. The mold clamping force is transmitted from the locking block 55 to the tie bar 32 through the notch 32b.

It should be noted that the present invention should be construed only from the matters described in the claims, and in the above-described embodiment, all the changes and modifications included in the concept of the present invention are other than those described. Is possible. For example, data Iba 32 as long a smooth lifting and required strength of the movable and stationary die holder 34, may be two or three. These intervals can be arbitrarily set. Further, the fixed mold holder 34 may be omitted, and the fixed mold 11 may be attached to the mold clamping block 25. Even if the mold is other than two plates, it is of the hot runner type. However, it should be noted that the present invention can be applied.

  As described above, all matters in the above-described embodiment are not intended to limit the present invention, and include any configuration that is not directly related to the present invention, and are arbitrarily determined according to the use and purpose thereof. It can be changed.

DESCRIPTION OF SYMBOLS 10 Injection molding machine 11 Fixed side metal mold | die 11a Receiving surface 11b Parting surface 11c Sprue 11d Front surface part 11e Rear surface part 11f, 11g Side surface part 11E, 11F 1st, 2nd alignment surface 11G Inclined surface 12 Movable side metal mold 12a Receiving surface 12b Parting surface 12d Front surface portion 12e Rear surface portion 12f, 12g Side surface portions 12E, 12F First and second alignment surfaces 12G Inclined surface 13 Injection device 14 Clamping device 15 Injection portion 16 Supply portion 16a Injection jacket 16b Feeder 16c Hopper 16d Material presence / absence detection sensor 17 Injection cylinder 17a Nozzle 18 Heater 19 Plunger 20 Plunger drive device 21 Injection motor 22 Reduction gear 22a Drive sprocket 23 Lifting mechanism 23a Lifting plate 23b Ball nut portion 23c Bo Screw shaft portion 23d Non-rotating mechanism 24 Column 25 Clamping block 25a Bottom surface 26 Bracket 27 Driven sprocket 28 Toothed belt 29a, 29b Limit switch 30 Control unit 31 Base 32 Tie bar 32a Ball screw portion 32b Notch portion 33 Block drive means 34 Fixation Side mold holder 34a Holder body 34E, 34F First and second alignment reference part 35 Movable side mold holder 35a Holder body 35b Escape part 35c Connection part 35d Open end face 35E, 35F First and second alignment reference 35g Tie bar insertion hole 35h Open end face 36 Holder drive means 36a Open / close motor 36b Drive sprocket 36c Driven sprocket 36d Toothed belt 36e Reducer 36f Encoder 37 Mold clamping force transmission member DESCRIPTION OF SYMBOLS 8 Transmission member drive means 38a Turning motor 38b Driving gear 38c Fan-shaped gear 38d Turning amount detection sensor 39 Ball nut part 40 Reduction gear 40a Planetary gear 40b Carrier 40c Sun gear 40d Internal gear 41 Mold clamping motor 41a Encoder 42 Thrust bearing 43 Angular bearing 44 Movable member 44a Pressing portion 44b Detachment prevention portion 44c Insertion guide surface 44d Handle portion 44e Escape portion 45 Spring biasing means 46 Pin 47 Roller 48 Stopper 49 Spring member 50 Ejector plate 51 Ejector pin 52 Mold clamping force receiving member 53 Rotating plate 53a Opening 53b Escape part 53c Long hole 54 Clamping force transmission block 55 Locking block 56 Support pin G interval L Length of mold clamping force transmission block

Claims (15)

A mold clamping method for generating a clamping force by pressing a first mold against a second mold,
Moving the second mold from its mold opening position to a mold clamping position that is farther from the base than the mold opening position;
The mold clamping force transmitting member for transmitting the clamping force on the base side to support this clamping force from said second mold, and the mold clamping position where the mold clamping force is transmitted to the base side, the mold clamping method characterized by clamping force equipped with a step of switching to a retracted position not transmitted to the base side. The first mold can be switched between a mold opening position and a mold clamping position farther from the base than the mold opening position, and the mold clamping force is pressed against the second mold at the mold clamping position. A mold clamping method for generating,
Moving the second mold from the mold opening position to the mold clamping position;
Interposing the mold clamping force the clamping force transmitting member for transmitting to the base side to support this clamping force from said second mold, between the second die and the base in the mold clamping position a clamping position for mold clamping method the clamping force transmitting member, characterized in that comprising the step of switching to a retracted position for retracting from between them.   The step of switching the mold clamping force transmission member between the mold clamping position and the retracted position includes a step of moving the mold clamping force transmission member in a direction crossing the direction of the mold clamping force. The mold clamping method according to claim 1 or claim 2. A first mold holder to which the first mold is attached;
A second mold holder to which a second mold is attached so as to face the first mold attached to the first mold holder;
Holder driving means for driving the second mold holder between a mold opening position and a mold clamping position farther from the base than the mold opening position;
A clamping force generating means for generating a clamping force to press the first mold attached to the first mold holder relative to the second die attached to said second mold holders,
A mold clamping force transmitting member for transmitting the mold clamping force generated by the mold clamping force generating means from the first mold attached to the first mold holder to the base side supporting the mold clamping force;
Transmission member drive means for switching the mold clamping force transmission member between a mold clamping position where the mold clamping force is transmitted to the base side and a retracted position where the mold clamping force is not transmitted to the base side. Clamping device. Base and
A plurality of tie bars projecting parallel to each other from this base;
A clamping block connected to the plurality of tie bars and movable along the longitudinal direction thereof,
Block driving means for driving the mold clamping block along a longitudinal direction of the plurality of tie bars between a mold clamping position and a standby position farther from the base than the mold clamping position;
A first mold holder connected to the plurality of tie bars between the base and the mold clamping block, movable along the longitudinal direction of the first mold holder, and the first mold is attached thereto;
A second mold holder that is connected to the plurality of tie bars between the base and the first mold holder, is movable along the longitudinal direction thereof, and a second mold is attached thereto;
Holder driving means for driving the second mold holder along the longitudinal direction of the plurality of tie bars between a mold opening position and a mold clamping position farther from the base than the mold opening position;
A mold clamping force transmission member for transmitting a mold clamping force applied from the mold clamping block by the block driving means via the first mold holder and the second mold holder to the base at the mold clamping position; ,
Transmission member driving means for driving the mold clamping force transmission member between a mold clamping position and a retracted position where the mold clamping force is not transmitted intersects the longitudinal direction of the plurality of tie bars. A mold clamping device characterized by that.   The apparatus further comprises means for urging the first mold holder away from the clamping block and a stopper for restricting movement of the first mold holder to the base side. The mold clamping apparatus according to claim 5.   The mold clamping device according to claim 5 or 6, wherein a distance between a mold clamping position and a standby position of the mold clamping block is in a range of 0.5 to 3 mm.   The block driving means includes a screw portion formed at a tip portion of the tie bar, a nut portion rotatably attached to the mold clamping block, and screwed to the screw portion, and driving and rotating the nut portions. The mold clamping device according to claim 5, further comprising a plurality of drive motors.   The block driving means further includes a control unit for independently controlling the operations of the plurality of drive motors, and the plurality of drive motors can transmit independent drive torques to the nut portion. The mold clamping apparatus according to claim 8.   The mold clamping force transmitting member projects from the base in parallel with the plurality of tie bars, and a plurality of mold clamping forces form a gap with the second mold holder whose tip is at the mold clamping position. A receiving member, a revolving plate attached to the second mold holder so as to be rotatable about an axis parallel to the longitudinal direction of the plurality of tie bars, and a mold clamping force transmission block attached to the revolving plate. The second mold holder has a relief portion through which the clamping force receiving member passes at the mold opening position, and the turning plate that is rotated by the transmission member driving means is the clamping force transmission block. A mold clamping position facing the front end surface of the plurality of mold clamping force receiving members and the opening end surface of the escape portion of the second mold holder, and the mold clamping force transmission block is the plurality of mold clamping force receiving members. Retraction position shifted to the side of the member Clamping device according to claim 5, characterized in that switched to either of claims 9.   The distance between the front end surface of the clamping force receiving member and the opening end surface of the escape portion of the second mold holder at the clamping position is the clamping force transmission block along the longitudinal direction of the plurality of tie bars. The mold clamping apparatus according to claim 10, wherein the mold clamping apparatus is set wider than the length of the mold.   The mold clamping device according to claim 10 or 11, wherein the mold clamping force receiving member is held so as to be displaceable along a longitudinal direction of the plurality of tie bars with respect to the revolving plate. .   The mold clamping force transmission member includes a plurality of tie bars, notches formed in the tie bars, and an axis parallel to the longitudinal direction of the plurality of tie bars with respect to the second mold holder. The revolving plate having a revolving plate attached so as to be able to swivel and a plurality of engaging blocks provided on the revolving plate, and the revolving plate revolving by the transmission member driving means includes the engaging block and the notch portion. The mold clamping device according to any one of claims 5 to 9, wherein the mold clamping device can be switched between a mold clamping position to be locked to each other and a retracted position to release the locking block from the notch portion.   The mold clamping device according to claim 13, wherein the swivel plate is held so as to be displaceable in a direction parallel to a longitudinal direction of the plurality of tie bars with respect to the second mold holder. An injection device that plasticizes the molding material and injects it into a cavity formed in the mold by a predetermined amount;
An injection molding machine comprising the mold clamping device according to any one of claims 4 to 14.

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