JP5752556B2 - Injection molding machine - Google Patents

Description

  The present invention relates to an injection molding machine including an electromagnet that drives a mold clamping operation.

  2. Description of the Related Art Conventionally, in an injection molding machine, resin is injected from an injection nozzle of an injection device, filled into a cavity space between a fixed mold and a movable mold, and solidified to obtain a molded product. ing. A mold clamping device is provided to move the movable mold relative to the fixed mold to perform mold closing, mold clamping, and mold opening.

  The mold clamping device includes a hydraulic mold clamping device that is driven by supplying oil to a hydraulic cylinder, and an electric mold clamping device that is driven by an electric motor. It is widely used because it has high controllability, does not pollute the surroundings, and has high energy efficiency. In this case, by driving the electric motor, the ball screw is rotated to generate a thrust, and the thrust is expanded by a toggle mechanism to generate a large mold clamping force.

  However, since the electric type mold clamping device having the configuration uses a toggle mechanism, it is difficult to change the mold clamping force due to the characteristics of the toggle mechanism, and the responsiveness and stability are improved. Unfortunately, the clamping force cannot be controlled during molding. Therefore, a mold clamping device is provided in which the thrust generated by the ball screw can be directly used as a mold clamping force. In this case, since the torque of the electric motor and the mold clamping force are proportional, the mold clamping force can be controlled during molding.

  However, in the conventional mold clamping device, the load resistance of the ball screw is low, and not only a large mold clamping force cannot be generated, but also the mold clamping force fluctuates due to torque ripple generated in the electric motor. In addition, in order to generate the mold clamping force, it is necessary to constantly supply current to the motor, and the power consumption and heat generation amount of the motor increase. Therefore, it is necessary to increase the rated output of the motor by that amount. The cost of the device becomes high.

  Therefore, a mold clamping device using a linear motor for the mold opening / closing operation and utilizing the attractive force of an electromagnet for the mold clamping operation is conceivable (for example, Patent Document 1).

WO05 / 090052 pamphlet

  By the way, in the case of using a mold clamping device that uses the attractive force of an electromagnet as described in Patent Document 1, if a single coil is used, there is a problem that the responsiveness is not good when the electromagnet is driven. .

  Then, this invention aims at provision of the injection molding machine which can improve the responsiveness of an electromagnet using a some coil effectively.

In order to achieve the above object, according to one aspect of the present invention, a first fixing member to which a fixed mold is attached;
A second fixing member disposed opposite to the first fixing member;
A first movable member to which a movable mold is attached;
A second movable member connected to the first movable member and moving together with the first movable member,
The second fixed member and the second movable member constitute a mold clamping force generation mechanism that generates a mold clamping force by an attractive force of an electromagnet,
One of the second fixed member and the second movable member constituting the mold clamping force generating mechanism has a coil groove in which a plurality of coils forming the electromagnet are arranged, and the plurality of coils are Laminated in the depth direction of the coil groove ,
The plurality of stacked coils are connected in parallel to a power source or connected to a plurality of power sources, respectively, and an injection molding machine is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the injection molding machine which can improve the responsiveness of an electromagnet using a some coil effectively is obtained.

It is a figure which shows the state at the time of the mold closing of the mold clamping apparatus in the injection molding machine of embodiment of this invention. It is a figure which shows the state at the time of the mold opening of the mold clamping apparatus in the injection molding machine of embodiment of this invention. FIG. 2 is a diagram illustrating a multipolar configuration according to the first embodiment, and is a plan view of the rear platen 13 on which a coil 48 is disposed as viewed in the mold clamping direction from the suction plate 22 side. FIG. 4 is a cross-sectional view taken along line AA in FIG. An example of the electric circuit diagram for driving the electromagnet unit 37 by Example 1 is shown. It is a figure which shows the multipolar structure by other Example (Example 2), and is the top view which looked at the rear platen 13 with which the coil 48 is arrange | positioned from the adsorption | suction board 22 side in the mold clamping direction. It is sectional drawing along line BB of FIG. An example of the electric circuit diagram for driving the electromagnet unit 37 by Example 2 is shown. It is a figure which shows the single pole structure by another Example (Example 3), and is the top view which looked at the rear platen 13 with which the coil 48 is arrange | positioned from the adsorption | suction board 22 side in the mold clamping direction. FIG. 10 is a sectional view taken along line CC in FIG. 9. An example of the electric circuit diagram for driving the electromagnet unit 37 by Example 3 is shown. It is a figure which shows the example of a coil cooling mechanism.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In the present embodiment, for the mold clamping device, the moving direction of the movable platen when closing the mold is the front, the moving direction of the movable platen when opening the mold is the rear, and the injection device is the injection The description will be made assuming that the moving direction of the screw when performing the measurement is the front and the moving direction of the screw when performing the measurement is the rear.

  FIG. 1 is a diagram showing a state when a mold clamping device is closed in an injection molding machine according to an embodiment of the present invention, and FIG. 2 is a state when the mold clamping device is opened in the injection molding machine according to the embodiment of the present invention. FIG. In FIGS. 1 and 2, the hatched members show the main cross section.

  In the figure, 10 is a mold clamping device, Fr is a frame (frame) of an injection molding machine, Gd is a guide movable with respect to the frame Fr, 11 is a guide not shown or fixed on the frame Fr. A rear platen 13 is arranged at a predetermined distance from the fixed platen 11 and opposed to the fixed platen 11, and four tie bars 14 (in the figure) are disposed between the fixed platen 11 and the rear platen 13. Shows only two of the four tie bars 14). The rear platen 13 is fixed with respect to the frame Fr.

  A screw portion (not shown) is formed at the front end portion (right end portion in the figure) of the tie bar 14, and the front end portion of the tie bar 14 is fixed to the fixed platen 11 by screwing and tightening the nut n1 to the screw portion. Is done. The rear end of the tie bar 14 is fixed to the rear platen 13.

  A movable platen 12 is disposed along the tie bar 14 so as to face the fixed platen 11 so as to be movable back and forth in the mold opening / closing direction. For this purpose, the movable platen 12 is fixed to the guide Gd, and a guide hole (not shown) for penetrating the tie bar 14 is formed at a position corresponding to the tie bar 14 in the movable platen 12. In addition, you may form a notch part instead of a guide hole. A suction plate 22 described later is also fixed to the guide Gd.

A fixed mold 15 is fixed to the fixed platen 11 and a movable mold 16 is fixed to the movable platen 12. The fixed mold 15 and the movable mold 16 are brought into contact with and separated from each other as the movable platen 12 advances and retreats. Then, mold closing, mold clamping and mold opening are performed. As the mold clamping is performed, a cavity space (not shown) is formed between the fixed mold 15 and the movable mold 16, and resin (not shown) injected from the injection nozzle 18 of the injection device 17 is formed in the cavity space. Filled . A mold device 19 is configured by the fixed mold 15 and the movable mold 16.

  The suction plate 22 is fixed to the guide Gd in parallel with the movable platen 12. As a result, the suction plate 22 can move forward and backward behind the rear platen 13. The suction plate 22 may be formed of a magnetic material. For example, the suction plate 22 may be configured by an electromagnetic laminated steel plate formed by laminating thin plates made of a ferromagnetic material. Alternatively, the suction plate 22 may be formed by casting.

  The linear motor 28 is provided on the guide Gd in order to advance and retract the movable platen 12. The linear motor 28 includes a stator 29 and a mover 31, and the stator 29 is formed on the frame Fr in parallel with the guide Gd and corresponding to the moving range of the movable platen 12. Is formed at a lower end of the movable platen 12 so as to face the stator 29 and over a predetermined range.

  The mover 31 includes a core 34 and a coil 35. The core 34 includes a plurality of magnetic pole teeth 33 that are protruded toward the stator 29 and formed at a predetermined pitch, and the coil 35 is wound around each magnetic pole tooth 33. The magnetic pole teeth 33 are formed in parallel to each other in a direction perpendicular to the moving direction of the movable platen 12. The stator 29 includes a core (not shown) and a permanent magnet (not shown) formed to extend on the core. The permanent magnet is formed by alternately magnetizing the N and S poles. When the linear motor 28 is driven by supplying a predetermined current to the coil 35, the movable element 31 is advanced and retracted, and accordingly, the movable platen 12 is advanced and retracted by the guide Gd to perform mold closing and mold opening. it can.

  In the present embodiment, the permanent magnet is disposed on the stator 29 and the coil 35 is disposed on the mover 31, but the coil is disposed on the stator and the permanent magnet is disposed on the mover. You can also. In this case, since the coil does not move as the linear motor 28 is driven, wiring for supplying power to the coil can be easily performed.

  The movable platen 12 and the suction plate 22 are not limited to be fixed to the guide Gd, and a movable element 31 of the linear motor 28 may be provided on the movable platen 12 or the suction plate 22. Further, the mold opening / closing mechanism is not limited to the linear motor 28, and may be a hydraulic type or an electric type.

  When the movable platen 12 is moved forward and the movable mold 16 abuts against the fixed mold 15, the mold is closed and subsequently the mold is clamped. An electromagnet unit 37 for clamping the mold is disposed between the rear platen 13 and the suction plate 22. A center rod 39 that extends through the rear platen 13 and the suction plate 22 and connects the movable platen 12 and the suction plate 22 is disposed so as to freely advance and retract. The center rod 39 advances and retracts the attracting plate 22 in conjunction with the advance and retreat of the movable platen 12 when the mold is closed and opened, and transmits the attracting force generated by the electromagnet unit 37 to the movable platen 12 when the mold is clamped. To do.

  The fixed platen 11, the movable platen 12, the rear platen 13, the suction plate 22, the linear motor 28, the electromagnet unit 37, the center rod 39, and the like constitute the mold clamping device 10.

  The electromagnet unit 37 includes an electromagnet 49 formed on the rear platen 13 side and a suction portion 51 formed on the suction plate 22 side. In addition, a coil groove 45 is formed around a predetermined portion of the rear end surface of the rear platen 13, that is, around the center rod 39 in the present embodiment. A coil 48 is wound around the core 46 in the coil groove 45. Note that the rear platen 13 may be constituted by an integral structure of a casting, or may be constituted by an electromagnetic laminated steel plate formed by laminating thin plates made of a ferromagnetic material.

  In the present embodiment, the electromagnet 49 may be formed separately from the rear platen 13, and the adsorption portion 51 may be formed separately from the adsorption plate 22, or the electromagnet may be adsorbed as a part of the rear platen 13 and adsorbed as a part of the adsorption plate 22. A part may be formed. Further, the arrangement of the electromagnet and the attracting part may be reversed. For example, the electromagnet 49 may be provided on the suction plate 22 side, and the suction portion may be provided on the rear platen 13 side.

  When an electric current is supplied to the coil 48 in the electromagnet unit 37, the electromagnet 49 is driven to attract the attracting part 51 and generate a mold clamping force.

  The center rod 39 is connected to the suction plate 22 at the rear end and is connected to the movable platen 12 at the front end. Therefore, the center rod 39 is advanced together with the movable platen 12 when the mold is closed to advance the suction plate 22, and is retracted together with the movable platen 12 when the mold is opened to retract the suction plate 22. For this purpose, a hole 41 for penetrating the center rod 39 is formed in the central portion of the rear platen 13, and a bearing such as a bush that slidably supports the center rod 39 facing the opening at the front end of the hole 41. A member Br1 is provided.

  The driving of the linear motor 28 and the electromagnet 49 of the mold clamping device 10 is controlled by the control unit 60. The control unit 60 includes a CPU, a memory, and the like, and also includes a circuit for supplying current to the coil 35 of the linear motor 28 and the coil 48 of the electromagnet 49 according to the result calculated by the CPU. A load detector 55 is also connected to the control unit 60. The load detector 55 is installed at a predetermined position (a predetermined position between the fixed platen 11 and the rear platen 13) of at least one tie bar 14 in the mold clamping device 10, and detects a load applied to the tie bar 14. . In the drawing, an example in which a load detector 55 is installed on two upper and lower tie bars 14 is shown. The load detector 55 is constituted by, for example, a sensor that detects the extension amount of the tie bar 14. The load detected by the load detector 55 is sent to the control unit 60. Note that the control unit 60 is omitted for the sake of convenience in FIG.

  Next, the operation of the mold clamping device 10 will be described.

  The mold closing process is controlled by the mold opening / closing processor 61 of the controller 60. In the state of FIG. 2 (the state at the time of mold opening), the mold opening / closing processor 61 supplies current to the coil 35. Subsequently, the linear motor 28 is driven, the movable platen 12 is advanced, and the movable mold 16 is brought into contact with the fixed mold 15 as shown in FIG. At this time, a gap δ is formed between the rear platen 13 and the suction plate 22, that is, between the electromagnet 49 and the suction portion 51. Note that the force required for mold closing is sufficiently reduced compared to the mold clamping force.

  Subsequently, the mold clamping processing unit 62 of the control unit 60 controls the mold clamping process. The mold clamping unit 62 supplies current to the coil 48 and attracts the attracting unit 51 by the attracting force of the electromagnet 49. Along with this, the clamping force is transmitted to the movable platen 12 through the suction plate 22 and the center rod 39, and clamping is performed. When changing the clamping force such as at the start of clamping, the clamping unit 62 generates a target clamping force to be obtained by the change, that is, a target clamping force in a steady state. Control is performed so that the necessary steady-state current value is supplied to the coil 48.

The mold clamping force is detected by the load detector 55. The detected mold clamping force is sent to the control unit 60, where the current supplied to the coil 48 is adjusted so that the mold clamping force becomes a set value, and feedback control is performed. During this time, the resin melted in the injection device 17 is injected from the injection nozzle 18 and filled into the cavity space of the mold device 19.

  When the resin in the cavity space is cooled and solidified, the mold opening / closing processor 61 controls the mold opening process. The mold clamping processing unit 62 stops the supply of current to the coil 48 in the state of FIG. Along with this, the linear motor 28 is driven, the movable platen 12 is moved backward, and the movable mold 16 is placed in the retracted limit position as shown in FIG.

  Here, a characteristic configuration of the present invention will be described with reference to FIG.

  FIG. 3 is a plan view of the multi-pole configuration according to the first embodiment when the rear platen 13 on which the coil 48 is disposed is viewed from the suction plate 22 side in the mold clamping direction. FIG. 4 is a cross-sectional view taken along line AA in FIG.

  As shown in FIG. 4, a plurality of coils 48 are arranged in the coil groove 45. Note that the stacking direction corresponds to the depth direction Y of the coil groove 45. In the example shown in FIG. 4, four coils 48a, 48b, 48c, and 48d are provided. The first set of coils 48 a and 48 b are stacked in the inner peripheral coil groove 45, and the second set of coils 48 c and 48 d are stacked in the outer peripheral coil groove 45. Thereby, electromagnets 49 having a plurality of poles are formed.

  In the example shown in the figure, two coil grooves 45 on the inner peripheral side and the outer peripheral side are formed, and each coil groove 45 is formed in a rectangular shape so as to surround the central portion 46a which is a part of the core 46. ing. An intermediate core portion 46 b that is a part of the core 46 is formed between the two coil grooves 45 on the inner peripheral side and the outer peripheral side. Note that the surfaces of the central portion 46a, the outer peripheral portion 47a, and the intermediate core portion 46b (surfaces on the suction plate 22 side) may extend in the same plane and define a gap surface. The coil groove 45 has a bottom surface that is offset from the gap surface by a depth.

  FIG. 5 shows an example of an electric circuit diagram for driving the electromagnet unit 37 according to the first embodiment. FIG. 5 shows an example in which four coils 48a, 48b, 48c, and 48d are connected in parallel to one power source. In this case, each of the inner peripheral side coils 48a and 48b is preferably connected in series with each one of the outer peripheral side coils 48c and 48d. Further, preferably, each of the bottom side coils 48b and 48d in the coil groove 45 is connected in series with each one of the open side coils 48a and 48c in the coil groove 45. In the illustrated example, the coil 48a on the opening side in the coil groove 45 on the inner peripheral side is connected in series with the coil 48d on the bottom side in the coil groove 45 on the outer peripheral side, and the bottom in the coil groove 45 on the inner peripheral side. The coil 48b on the side is connected in series with the coil 48c on the opening side in the coil groove 45 on the outer peripheral side. The coils 48a and 48d and the coils 48b and 48c are connected in parallel to one power source.

  Thus, the voltage applied to the coils 48a, 48b, 48c, 48d can be increased by connecting the plurality of coils 48a, 48b, 48c, 48d in parallel to the power supply instead of being connected in series. The responsiveness of the electromagnet unit 37 can be improved. From the same viewpoint, a power source may be provided for each of the coils 48a, 48b, 48c, and 48d. Further, a power source may be provided for each of the set of the coil 48a and the coil 48d and the set of the coil 48b and the coil 48c.

  Here, the coil resistance (coil resistance component) of each of the coils 48a, 48b, 48c, and 48d depends on the total length of each of the coils 48a, 48b, 48c, and 48d. Therefore, when the number of turns is the same, the inner peripheral coils 48a and 48b have substantially the same coil resistance, and the outer peripheral coils 48c and 48d have substantially the same coil resistance. The coil resistances of the side coils 48c and 48d are larger than the coil resistances of the inner peripheral coils 48a and 48b. Therefore, by connecting the coils 48a, 48b, 48c, and 48d in a manner as shown in FIG. 5, the coil resistance as a whole of the coils 48a and 48d becomes the coil resistance as the whole of the coils 48b and 48c. It becomes almost the same. Thereby, even when the coils 48a, 48b, 48c, and 48d are connected in parallel, the imbalance due to the coil resistance change caused by heat can be alleviated. The inductances of the coils 48a, 48b, 48c, and 48d depend on the position (depth) in the coil groove 45 and the area that the coil surrounds. Therefore, by connecting the coils 48a, 48b, 48c, and 48d in the manner shown in FIG. 5, the inductance imbalance between the coils 48a and 48d and the coils 48b and 48c can be alleviated. it can.

  In the example shown in FIGS. 3 to 5, the four coils 48a, 48b, 48c, and 48d form two poles (two phases), but the number of poles may be arbitrary.

  FIG. 6 is a diagram showing a multipolar configuration according to another embodiment (embodiment 2), and is a plan view of the rear platen 13 on which the coil 48 is arranged viewed from the suction plate 22 side in the mold clamping direction. FIG. 7 is a cross-sectional view taken along line BB in FIG.

  In the second embodiment, the rear platen 13 is provided with an electromagnet so that four poles are formed. Specifically, four cores 46e-46h are provided between the central portion 47b where the hole 41 through which the center rod 39 passes is formed and the outer peripheral portion 47c. The coil groove 45 is formed so as to surround each of the cores 46e to 46h. Coils 48e-48h are wound around the cores 46e-46h. Since FIG. 6 is a simplified diagram, the coils 48e-48h are illustrated in contact with each other. However, the coils 48e-48h may be disposed apart from each other.

Also in the second embodiment, a plurality of coils are stacked in the coil groove 45 as in the first embodiment described above. Specifically, as shown in FIG. 7, the coil 48 h includes two coils 48 h ₁ and 48 h ₂ , and the two coils 48 h ₁ and 48 h ₂ are stacked in the coil groove 45. Similarly, the coil 48 f includes two coils 48 f ₁ and 48 f ₂ , and the two coils 48 f ₁ and 48 f ₂ are stacked in the coil groove 45. In FIG. 7, only the set of the coil 48h and the coil 48f is illustrated, but the same may be applied to the other set of coils 48e and 48g.

  FIG. 8 shows an example of an electric circuit diagram for driving the electromagnet unit 37 according to the second embodiment. In FIG. 8, only the set of the coil 48h and the coil 48f is shown corresponding to FIG. 7, but the same may be applied to the other set of coils 48e and 48g.

FIG. 8 shows an example in which four coils 48h ₁ , 48h ₂ , 48f ₁ , 48f ₂ are connected in parallel to one power source. In this case, preferably, each of the bottom side coils 48h ₂ and 48f ₂ in the coil groove 45 is connected in series with each of the opening side coils 48f ₁ and 48h ₁ in the coil groove 45. The coil 48h ₂ and the coil 48f ₁ and the coil 48h ₁ and the coil 48f ₂ are connected in parallel to one power source.

In this way, the plurality of coils 48h ₁ , 48h ₂ , 48f ₁ , 48f ₂ are not connected in series to the power supply but are connected in parallel to be applied to the coils 48h ₁ , 48h ₂ , 48f ₁ , 48f ₂ . The applied voltage can be increased, and the responsiveness of the electromagnet unit 37 can be improved. From the same viewpoint, a power source may be provided for each of the coils 48h ₁ , 48h ₂ , 48f ₁ , 48f ₂ . Further, a power source may be provided for each of the set of the coil 48h ₂ and the coil 48f _{1 and} the set of the coil 48h ₁ and the coil 48f ₂ .

Also, by connecting the coil _{48h 1, 48h 2, 48f 1} , 48f 2 in the manner shown in FIG. 8, the coil resistance and inductance of the entire coil 48h ₂ and the coil 48f ₁ is coil 48h ₁ and as a whole substantially the same as the coil resistance and inductance of the coil 48f _2. As a result, even when the coils 48h ₁ , 48h ₂ , 48f ₁ , and 48f ₂ are connected in parallel, it is possible to prevent the inductance from being unbalanced and to relieve the imbalance due to the coil resistance change due to heat. .

  FIG. 9 is a diagram showing a single-pole configuration according to another embodiment (embodiment 3), and is a plan view of the rear platen 13 on which the coil 48 is arranged as viewed in the mold clamping direction from the suction plate 22 side. 10 is a cross-sectional view taken along line CC in FIG.

In the third embodiment, the coil groove 45 is formed in a rectangular shape around the central core 46g. Also in the third embodiment, a plurality of coils are stacked in the coil groove 45 as in the first embodiment described above. Specifically, as shown in FIG. 9, the coil 48 g includes four coils 48 g ₁ , 48 g ₂ , 48 g ₃ , 48 g ₄ , and the four coils 48 g ₁ , 48 g ₂ , 48 g ₃ , 48 g ₄ are coil grooves. 45 are stacked and arranged.

  FIG. 11 shows an example of an electric circuit diagram for driving the electromagnet unit 37 according to the third embodiment.

FIG. 11 shows an example in which four coils 48g ₁ , 48g ₂ , 48g ₃ , 48g ₄ are connected in parallel to one power source. In this case, preferably, the bottom side coil 48g ₁ in the coil groove 45 is connected in series with the opening side coil 48g ₄ in the coil groove 45, and the second coil 48g ₂ from the bottom side in the coil groove 45 is connected. but it is connected from the opening side of the coil groove 45 in the second coil 48 g ₃ series. Then, the coil 48 g ₁ and the coil 48 g _4, and the coil 48 g ₂ and the coil 48 g ₃ is connected in parallel to a single power source.

In this way, the plurality of coils 48g ₁ , 48g ₂ , 48g ₃ , 48g ₄ are not connected in series to the power supply but are connected in parallel to be applied to the coils 48g ₁ , 48g ₂ , 48g ₃ , 48g ₄ . The applied voltage can be increased, and the responsiveness of the electromagnet unit 37 can be improved. From the same viewpoint, a power source may be provided for each of the coils 48g ₁ , 48g ₂ , 48g ₃ , 48g ₄ . Also, a set of coils 48 g ₁ and the coil 48 g _4, for the set of coils 48 g ₂ and the coil 48 g _3, may supply respectively are provided.

Also, by connecting the coil _{48g 1, 48g 2, 48g 3} , 48g 4 in the manner shown in FIG. 11, the coil resistance and inductance of the entire coil 48 g ₁ and the coil 48 g ₄ are coils 48 g ₂ and as a whole substantially the same as the coil resistance and inductance of the coil 48 g _3. As a result, even when the coils 48g ₁ , 48g ₂ , 48g ₃ , and 48g ₄ are connected in parallel, it is possible to prevent the imbalance of the inductance and to relieve the imbalance due to the coil resistance change due to heat. .

In the example shown in FIGS. 9 to 11, four coils 48g ₁ , 48g ₂ , 48g ₃ , and 48g ₄ are stacked in the coil groove 45, but six or eight, More coils may be stacked in the coil groove 45.

  Next, a coil cooling mechanism that may be applied to each of the embodiments described above will be described.

  FIG. 12 is a diagram illustrating an example of a coil cooling mechanism. Here, as shown in FIG. 12, it is assumed that two coils 48 are laminated as an example. The coil cooling mechanism 90 is disposed in the coil groove 45. Thereby, the several coil 48 laminated | stacked in the coil groove | channel 45 as mentioned above can be cooled efficiently. The coil cooling mechanism 90 may be, for example, a pipe through which a cooling fluid flows or a plate in which a passage for the cooling fluid is formed. The cooling fluid may be water or oil.

  More specifically, in the example illustrated in FIG. 12A, the coil cooling mechanism 90 is disposed between the plurality of coils in the depth direction of the coil groove 45. In the example shown in FIG. 12 (A), it is disposed between two coils 48. In addition, when three or more coils are laminated | stacked, the coil cooling mechanism 90 may be provided between each layer, and the coil cooling mechanism 90 may be provided between specific layers.

  In the example shown in FIG. 12B, the coil cooling mechanism 90 is disposed so as to cover the uppermost coil 48 on the opening side of the coil groove 45. Note that the example shown in FIG. 12B can be combined with the example shown in FIG. That is, the coil cooling mechanism 90 may be provided between the plurality of coils 48 in the depth direction of the coil groove 45, and the coil cooling mechanism 90 may be provided so as to cover the uppermost coil 48 on the opening side of the coil groove 45. .

  In the embodiment described above, the “first fixed member” in the claims corresponds to the fixed platen 11, and the “first movable member” in the claims corresponds to the movable platen 12. . The “second fixing member” in the claims corresponds to the rear platen 13, and the “second movable member” in the claims corresponds to the suction plate 22.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, as described above, the electromagnet 49 may be provided on the suction plate 22 side, and the suction portion may be provided on the rear platen 13 side. When the electromagnet 49 is provided on the suction plate 22 side in this way, a coil stacking configuration similar to that described above may be realized on the suction plate 22 side.

  In the above description, the mold clamping device 10 having a specific configuration is illustrated, but the mold clamping device 10 may have any configuration as long as the mold clamping is performed using an electromagnet.

Br1 bearing member Fr frame Gd guide 10 mold clamping device 11 fixed platen 12 movable platen 13 rear platen 14 tie bar 15 fixed mold 16 movable mold 17 injection device 18 injection nozzle 19 mold device 22 suction plate 28 linear motor 29 stator 31 movable Child 33 Magnetic pole teeth 34 Core 35 Coil 37 Electromagnet unit 39 Center rod 41 Hole 45 Coil groove 46, Core 46e-46h, 46g Core 46a Central part 46b Intermediate core part 47a, 47c Outer peripheral part 47b Central part 48 (48a-48h) Coil 49 Electromagnet 51 Adsorbing part 55 Load detector 60 Control part 61 Mold opening / closing processing part 62 Clamping processing part 90 Coil cooling mechanism

Claims (6)

A first fixing member to which a fixed mold is attached;
A second fixing member disposed opposite to the first fixing member;
A first movable member to which a movable mold is attached;
A second movable member connected to the first movable member and moving together with the first movable member,
The second fixed member and the second movable member constitute a mold clamping force generation mechanism that generates a mold clamping force by an attractive force of an electromagnet,
One of the second fixed member and the second movable member constituting the mold clamping force generating mechanism has a coil groove in which a plurality of coils forming the electromagnet are arranged, and the plurality of coils are Laminated in the depth direction of the coil groove ,
The plurality of laminated coils are connected in parallel to a power source or connected to a plurality of power sources, respectively . 2. The injection molding machine according to claim 1 , wherein the electromagnet has at least two poles, and a coil according to one pole and a coil according to another pole are arranged to be stacked in a depth direction of the coil groove. The plurality of stacked coils are connected in parallel to a power source,
The injection molding machine according to any one of claims 1 to 2 , wherein coils in parallel relation are configured to have substantially the same coil resistance and inductance. The coil groove, a cooling mechanism for cooling the coil is provided, the injection molding machine according to any one of claims 1-3. The injection molding machine according to claim 4 , wherein the cooling mechanism is disposed between the plurality of coils in a depth direction of the coil groove. The injection molding machine according to claim 4 or 5 , wherein the cooling mechanism is disposed so as to cover the uppermost coil on the opening side of the coil groove.

Images