TW201350306A - Injection molding machine - Google Patents

Abstract

The present invention provides an injection molding machine of which the laminated steel sheets of clamping force generating mechanism have excellent durability. The injection molding machine (10) of the present invention comprising: a first mold block (13), which is formed with an electromagnet (49); a second mold block (22), which is attracted by the electromagnet (49), the first mold block (13) and the second mold block (22) constitute the clamping force generating mechanism for generating a clamping force. At least one of the first mold block (13) and the second mold block is provided with laminated steel sheets (81 to 84) constituted by laminating a plurality of electromagnetic steel sheets (91 to 93) in a predetermined direction and a plurality of plates (71 to 73) sandwiching the laminated steel sheets in a predetermined direction.

Description

Injection molding machine

The present invention relates to an injection molding machine.

The injection molding machine produces a molded article by filling and solidifying the molten resin in the cavity space of the mold device. The mold device is composed of a fixed mold and a movable mold, and a cavity space is formed between the fixed mold and the movable mold during mold clamping. The mold closing, mold clamping, and mold opening of the mold apparatus are performed by a mold clamping device. As a mold clamping device, a mold clamping device using a linear motor in a mold opening and closing operation and an electromagnet in a mold clamping operation has been proposed (for example, refer to Patent Document 1).

When a direct current is supplied to the coil of the electromagnet, an adsorption force is generated between the first module in which the electromagnet is formed and the second module disposed at a distance from the first module, and the clamping force is generated by the adsorption force. . The first module and the second module constitute a mold clamping force generation mechanism.

When the mold clamping force is changed when the mold clamping is started, the supply current to the electromagnet coil changes, and the magnetic field generated by the electromagnet changes. The eddy current flows through the first module and the second module in a direction to eliminate the change, thereby generating iron loss and heat. In addition, if eddy current is generated, the mold clamping force corresponding to the supply current is not immediately generated and the responsiveness is deteriorated, so that the supply current becomes excessively large and generates a large amount. The rest of the heat. Therefore, in order to reduce eddy currents, it is studied to form a first module and a second module by laminating steel sheets in which a plurality of electromagnetic steel sheets are laminated.

(previous technical literature) (Patent Literature)

Patent Document 1: International Publication No. 2005/090052

Conventionally, since a plurality of electromagnetic steel sheets are fixed by welding, a plurality of electromagnetic steel sheets may be separated by mold clamping, and there is room for improvement in durability of the laminated steel sheets.

The present invention has been made in view of the above-described problems, and an object thereof is to provide an injection molding machine having excellent durability of a laminated steel sheet having a mold clamping force generating mechanism.

In order to solve the above problems, an injection molding machine according to one aspect of the present invention includes: a first module in which an electromagnet is formed; and a second module in which the electromagnet is adsorbed by the first module and the second The module is configured to have a mold clamping force generating mechanism that generates a mold clamping force, and at least one of the first module and the second module has a laminated steel sheet in which a plurality of electromagnetic steel sheets are stacked in a predetermined direction; A plurality of sheets of the laminated steel sheet are sandwiched in the predetermined direction.

According to the present invention, an injection molding machine having a high durability of a laminated steel sheet having a mold clamping force generating mechanism is provided.

10‧‧‧ Injection molding machine

11‧‧‧Fixed platen (1st fixture)

12‧‧‧ movable platen (1st movable piece)

13‧‧‧ Rear platen (1st module, 2nd fixture)

15‧‧‧Fixed mode

16‧‧‧ movable mold

19‧‧‧Molding device

22‧‧‧Adsorption plate (2nd module, 2nd movable part)

23‧‧‧through hole of the adsorption plate

41‧‧‧through plate through hole

45‧‧‧ coil slot

46‧‧‧ magnetic core

48‧‧‧ coil

49‧‧‧Electromagnet

60‧‧‧Control Department

61, 62‧‧‧Outer connecting rod (connection)

63‧‧‧Inner connecting rod (connection)

70‧‧‧The skeleton of the rear platen

71‧‧‧Outer support plate

71d‧‧‧Flow

72‧‧‧Outer support plate

72d‧‧‧Flow

73‧‧‧Inside support plate

73a‧‧‧Coil holding unit

73d‧‧‧Flow

74‧‧‧Inside support plate

74a‧‧‧Coil holding unit

74d‧‧‧Flow

75‧‧‧Connecting rod

81, 82‧‧‧Outer laminated steel plate

83, 84‧‧‧ inside laminated steel plate

91~93‧‧‧Electromagnetic steel plate

Fig. 1 is a view showing a state at the time of completion of mold closing by an injection molding machine according to an embodiment of the present invention.

Fig. 2 is a view showing a state at the time of completion of mold opening by an injection molding machine according to an embodiment of the present invention.

Fig. 3 is a perspective view showing the skeleton of the press plate based on an embodiment.

Fig. 4 is a view showing the structure of an outer side support plate and an inner side support plate based on an embodiment.

Fig. 5 is a perspective view showing the entire rear platen based on an embodiment.

Fig. 6 is a view showing the structure of a plurality of electromagnetic steel sheets according to an embodiment.

In the following, the embodiments for carrying out the invention will be described with reference to the accompanying drawings. In each of the drawings, the X direction indicates a square parallel to the mold opening and closing direction. The Y direction indicates a direction parallel to the lamination direction of the electromagnetic steel sheets, and the Z direction indicates a direction perpendicular to the X direction and the Y direction. In addition, the moving direction of the movable platen when the mold is closed is set to the front, and the moving direction of the movable platen when the mold is opened is set to the rear.

Fig. 1 is a view showing a state at the time of completion of mold closing by an injection molding machine according to an embodiment of the present invention. Fig. 2 is a view showing a state at the time of completion of mold opening by an injection molding machine according to an embodiment of the present invention.

In the figure, 10 is an injection molding machine, Fr is a frame of the injection molding machine 10, Gd is a guide member composed of two rails laid on the frame Fr, and 11 is a fixed pressure plate (first fixing member). The fixed platen 11 can be disposed on the position adjustment base Ba which is movable along the guide member Gd extending in the mold opening and closing direction (the horizontal direction in the drawing). In addition, the fixed platen 11 can also be placed on the frame Fr.

A movable platen (first movable member) 12 is disposed to face the fixed platen 11. The movable platen 12 is fixed to the movable base Bb, and the movable base Bb can travel on the guide Gd. Thereby, the movable platen 12 can be moved in the mold opening and closing direction with respect to the fixed platen 11.

A rear platen (second fixture) 13 is disposed in parallel with the fixed platen 11 at a predetermined interval from the fixed platen 11. The rear platen 13 is fixed to the frame Fr via the leg portion 13a.

Four tie bars 14 (only two of the four tie bars 14 are shown in the drawing) are spanned between the fixed platen 11 and the rear platen 13 . The fixed platen 11 is fixed to the rear platen 13 via a tie rod 14. The movable platen 12 is disposed to move forward and backward along the tie rod 14. The figure for inserting the tie rod 14 is not shown. The guide hole is formed at a portion corresponding to the tie rod 14 of the movable platen 12. In addition, a notch portion may be formed instead of the via hole.

A threaded portion (not shown) is formed at a front end portion (right end portion in the drawing) of the tie rod 14, and the nut n1 is screwed and fastened to the screw portion, whereby the front end portion of the tie rod 14 is fixed to the fixed pressure plate 11. The rear end portion of the tie rod 14 is fixed to the rear pressure plate 13.

A fixed die 15 is mounted on the fixed platen 11, and a movable die 16 is mounted on the movable platen 12. The fixed die 15 and the movable die 16 are contacted and separated with the advancement and retreat of the movable platen 12, thereby performing mold closing, mold clamping, and mold opening. . Further, as the mold clamping is performed, a cavity space (not shown) is formed between the fixed mold 15 and the movable mold 16, and the molten resin is filled in the cavity space. The mold device 19 is constituted by the fixed mold 15 and the movable mold 16.

The adsorption plate 22 is disposed in parallel with the movable platen 12. The suction plate 22 is fixed to the slide base Sb via a mounting plate 27, and the slide base Sb can travel on the guide Gd. Thereby, the suction plate 22 can move forward and backward more than the rear pressure plate 13. The adsorption plate 22 may be formed of a soft magnetic material. Further, the mounting plate 27 may not be provided, and in this case, the suction plate 22 is directly fixed to the sliding base Sb.

The rod 39 is disposed to be coupled to the suction plate 22 at the rear end portion and coupled to the movable platen 12 at the front end portion. Therefore, the rod 39 advances with the advancement of the suction plate 22 at the time of mold closing, and advances the movable platen 12, and retreats with the retraction of the suction plate 22 at the time of mold opening, and the movable platen 12 retreats. Therefore, a through hole 41 for penetrating the rod 39 is formed in the central portion of the rear platen 13.

The linear motor 28 is a mold opening and closing drive for moving the movable platen 12 forward and backward. The portion is disposed, for example, between the suction plate 22 coupled to the movable platen 12 and the frame Fr. Further, the linear motor 28 may be disposed between the movable platen 12 and the frame Fr.

The linear motor 28 includes a stator 29 and a rotor 31. The stator 29 is formed to be parallel to the guide Gd on the frame Fr and to correspond to the range of movement of the slide base Sb. The rotor 31 is formed to face the stator 29 at a lower end of the slide base Sb and over a predetermined range.

The rotor 31 includes a magnetic core 34 and a coil 35. The magnetic core 34 has a plurality of magnetic pole teeth 33 that protrude toward the stator 29. The plurality of magnetic pole teeth 33 are arranged at a predetermined pitch in a direction parallel to the opening and closing direction of the mold, and the coil 35 is wound around the respective magnetic pole teeth 33.

The stator 29 includes a magnetic core (not shown) and a plurality of permanent magnets (not shown) provided on the magnetic core. The plurality of permanent magnets are arranged at a predetermined pitch in a direction parallel to the opening and closing direction of the mold, and the magnetic poles on the side of the rotor 31 are alternately magnetized by the N pole and the S pole.

When a predetermined current is supplied to the coil 35 of the rotor 31, the rotor 31 is advanced and retracted by the interaction of the magnetic field formed by the current flowing in the coil 35 and the magnetic field formed by the permanent magnet. Accordingly, the adsorption plate 22 and the movable platen 12 are advanced and retracted to perform mold closing and mold opening. The linear motor 28 is feedback-controlled based on the detection result of the position sensor 53 that detects the position of the rotor 31 so that the position of the rotor 31 becomes a target value.

Further, in the present embodiment, a permanent magnet is disposed in the stator 29, and the coil 35 is disposed in the rotor 31. However, a coil may be disposed in the stator, and a permanent magnet may be disposed in the rotor. At this time, the coil does not drive with the linear motor 28 Since it moves, wiring for supplying electric power to a coil can be performed easily.

Further, as the mold opening/closing drive unit, a rotary motor and a ball screw mechanism that converts the rotational motion of the rotary motor into a linear motion or a fluid pressure cylinder such as a hydraulic cylinder or an air cylinder may be used instead of the linear motor 28.

The electromagnet unit 37 generates an adsorption force between the rear platen 13 and the adsorption plate 22. This suction force is transmitted to the movable platen 12 via the rod 39, and a mold clamping force is generated between the movable platen 12 and the fixed platen 11.

The electromagnet unit 37 is composed of an electromagnet 49 formed on the side of the rear platen 13 and an adsorption portion 51 formed on the side of the adsorption plate 22. The adsorption portion 51 is formed in a predetermined portion of the adsorption surface (front end surface) of the adsorption plate 22, for example, a portion of the adsorption plate 22 that surrounds the rod 39 and faces the electromagnet 49. Further, a predetermined portion of the suction surface (rear end surface) of the rear platen 13, for example, a coil groove 45 for accommodating the coil 48 of the electromagnet 49 is formed around the rod 39. The magnetic core 46 is formed inside the coil groove 45. The coil 48 is wound around the core 46. The axial direction of the coil 48 is in the X direction. A portion other than the magnetic core 46 in the rear platen 13 is formed with a yoke 47.

Further, in the present embodiment, the electromagnet 49 is formed separately from the rear platen 13, and the adsorption portion 51 is formed separately from the adsorption plate 22, but the electromagnet may be formed as a part of the rear platen 13, and the adsorption portion may be used as an adsorption plate. A part of 22 is formed. Further, the electromagnet and the adsorption portion may be arranged in reverse. For example, the electromagnet 49 can be provided on the side of the adsorption plate 22, and the adsorption portion 51 can be provided on the side of the rear platen 13. Further, the number of the coils 48 of the electromagnet 49 may be plural.

In the electromagnet unit 37, when a current is supplied to the coil 48, the electromagnet 49 is driven and the adsorption portion 51 is adsorbed, whereby a mold clamping force can be generated. The platen (first module) 13 and the suction plate (second module) 22 on which the adsorption unit 51 is formed are formed by the electromagnet 49, and constitute a mold clamping force generating mechanism.

The control unit 60 includes, for example, a CPU, a memory, and the like, and controls the operation of the linear motor 28 and the operation of the electromagnet 49 by the CPU processing the control program recorded in the memory. The control unit 60 is connected to the mold clamping force sensor 55 that detects the mold clamping force, and can set the supply current value to the coil 48 of the electromagnet 49 in accordance with the detection result of the mold clamping force sensor 55 to generate a predetermined mold clamping force. The mold clamping force sensor 55 may also be, for example, a strain sensor that detects the strain (elongation amount) of the tie rod 14 that is elongated in accordance with the mold clamping force. Further, as the mold clamping force sensor 55, for example, a load sensor such as a load cell for detecting a load applied to the rod 39 and a magnetic sensor for detecting a magnetic field of the electromagnet 49 can be used, and the mold clamping force is sensed. The type of the device 55 can be varied.

Next, the operation of the injection molding machine 10 having the above configuration will be described. The various operations of the injection molding machine 10 are performed under the control of the control unit 60.

The control unit 60 controls the mold closing process. The control unit 60 drives the linear motor 28 in the state (opening state) of Fig. 2 to advance the movable platen 12. As shown in Fig. 1, the movable mold 16 abuts against the fixed mold 15 to end the mold closing process. At this time, a gap δ is formed between the rear platen 13 and the adsorption plate 22, that is, between the electromagnet 49 and the adsorption portion 51. In addition, the force required to close the mold is very small compared to the clamping force.

Next, the control unit 60 controls the mold clamping process. Control unit 60 is shown in the first figure In the state (closed mode), a direct current is supplied to the coil 48 of the electromagnet 49. As a result, a magnetic field is generated in the coil 48 by the direct current flowing in the coil 48 and the core 46 is magnetized, whereby the magnetic field is strengthened. Further, an adsorption force is generated between the electromagnet 49 opposed to the predetermined gap and the adsorption portion 51, and the adsorption force is transmitted to the movable platen 12 via the rod 39, thereby generating a mold clamping force between the movable platen 12 and the fixed platen 11. . The molten resin is filled in the cavity space of the mold device 19 in the mold clamping state, and is cooled and solidified to be a molded article.

Next, the control unit 60 demagnetizes the magnetic core 46 of the electromagnet 49. Degaussing of the magnetic core 46 is performed by supplying a direct current opposite to the magnetization to the coil 48. In the degaussing process, the direction of the DC current can be reversed multiple times. The demagnetization of the magnetic core 46 shortens the waiting time until the start of the mold opening.

Next, the control unit 60 controls the mold opening process. The control unit 60 supplies a current to the coil 35 of the linear motor 28 to move the movable platen 12 backward. The movable mold 16 is retracted to perform mold opening. After the mold is opened, the ejector unit (not shown) pushes out the molded article from the movable mold 16. The molded article is thus obtained.

However, if the mold device 19 is replaced, the thickness of the mold device 19 is changed and the gap δ formed between the rear platen 13 and the suction plate 22 is changed when the mold closing is completed. If the gap δ changes, the adsorption force changes and the mold clamping force changes.

Therefore, the injection molding machine 10 includes a mold thickness adjusting portion 56 that adjusts the interval between the movable platen 12 and the suction plate 22 in accordance with the thickness of the mold device 19. The mold thickness adjusting portion 56 is composed of a mold thickness adjusting motor 57, a gear 58, a nut 59, and the like. The nut 59 rotates freely relative to the suction plate 22 and is not retractable. Be supported. The threaded shaft portion 43 formed at the rear end portion of the rod 39 penetrating the central portion of the suction plate 22 is screwed to the nut 59. The moving direction changing portion is constituted by a nut 59 and a threaded shaft portion 43 in which the rotational motion of the nut 59 is converted into a linear motion of the rod 39. The outer peripheral surface of the nut 59 is formed with a gear (not shown) that meshes with a gear 58 that is attached to the output shaft 57a of the mold thickness adjusting motor 57. The mold thickness adjustment motor 57 is, for example, a servo motor, and includes an encoder portion 57b that detects the number of rotations of the output shaft 57a.

When the mold thickness adjustment motor 57 rotates, the nut 59 rotates, the rod 39 advances and retreats with respect to the suction plate 22, and the interval between the suction plate 22 and the movable platen 12 is adjusted. Therefore, the pitch δ at the end of the mold closing can be adjusted to an optimum value. The mold thickness adjustment motor 57 is feedback-controlled in accordance with the detection result of the encoder portion 57b so that the pitch δ reaches a desired value.

Next, the structure of the rear platen 13 will be described with reference to Figs. 3 to 6 . Fig. 3 is a perspective view showing the skeleton of the press plate based on an embodiment. Fig. 4 is a view showing the structure of an outer side support plate and an inner side support plate based on an embodiment. Further, since the structures of the two outer support plates are substantially the same, the illustration of one of them is omitted. Further, since the structures of the two inner support plates are substantially the same, the illustration of one of them is omitted. Fig. 5 is a perspective view showing the entire rear platen based on an embodiment. Fig. 6 is a view showing the structure of a plurality of electromagnetic steel sheets according to an embodiment.

For example, as shown in FIGS. 3 and 4, the rear pressure plate 13 has two outer support plates 71 and 72, two inner support plates 73 and 74, outer connecting rods (coupling portions) 61 and 62, and inner connecting rods (connected). Department 63 and connecting rod 75 Skeleton 70.

The outer support plates 71 and 72 are made of a soft magnetic material such as an SS material, and are disposed at intervals in the Y direction. The outer support plates 71 and 72 are formed with concave portions 71a and 72a as wire holding portions for holding the coils 48 electrically connected to the electromagnets 49 and the wires of the external power source.

Further, in the present embodiment, the concave portions 71a and 72a serving as the wire holding portions are formed on the outer support plates 71 and 72, but the concave portions of the coil holding portions of the coils 48 for holding the electromagnets 49 may be formed on the outer support plates 71 and 72. .

The inner support plates 73 and 74 are made of a soft magnetic material such as an SS material, and are disposed between the two outer support plates 71 and 72. Concave portions 73a and 74a as coil holding portions for holding the coils 48 of the electromagnets 49 are formed on the inner support plates 73 and 74. The coil grooves 45 are formed by the concave portions 73a and 74a of the inner side support plates 73 and 74 and the concave portions 91a to 93a of the electromagnetic steel sheets 91 to 93 to be described later.

The outer connecting rod 61 connects the outer support plate 71 and the inner support plate 73. The threaded shaft portion formed at one end portion of the outer connecting rod 61 is screwed into the screw hole 73b formed in the inner side support plate 73. The other end portion of the outer connecting rod 61 penetrates through the through hole 71b formed in the outer support plate 71. The flange portion (not shown) formed at the other end portion of the outer connecting rod 61 abuts against the surface on the opposite side of the outer side laminated steel plate 81 (see FIG. 5) of the outer side support plate 71. Similarly, the outer connecting rod 62 connects the outer support plate 72 and the inner support plate 74. The structure of the outer connecting rod 62 is substantially the same as the structure of the outer connecting rod 61. As shown in FIG. 5, the flange portion 62a formed on the outer connecting rod 62 abuts against the side surface on the opposite side of the outer laminated steel plate 82 of the outer side support plate 72.

The inner connecting rod 63 connects the two inner supporting plates 73 and 74. About inside The side connecting rod 63 has a threaded shaft portion formed at one end portion of the inner connecting rod 63 screwed into a screw hole 73c formed in one of the inner side supporting plates 73. The other end portion of the inner connecting rod 63 is inserted into the insertion hole 74c of the other inner side support plate 74. The insertion hole 74c is composed of a large diameter portion and a small diameter portion, and the large diameter portion and the step difference surface of the small diameter portion abut against the flange portion 63a formed at the other end portion of the inner connecting rod 63 (see Fig. 3). The flange portion 63a is housed in the large diameter portion of the insertion hole 74c.

The connecting rod 75 is made of a soft magnetic material such as an SS material. The connecting rod 75 connects the outer support plates 71 and 72 and the inner support plates 73 and 74. The outer support plates 71, 72 and the inner support plates 73, 74 and the connecting rod 75 are fastened by a fixing bolt 77 (see Fig. 4). An insertion hole into which the fixing bolt 77 is inserted is formed in the connecting rod 75. The insertion hole is composed of a small diameter portion and a large diameter portion, and the large diameter portion accommodates the head portion 77b of the fixing bolt 77, and the small diameter portion allows the shaft portion 77a of the fixing bolt 77 to be inserted. The front end portion of the shaft portion 77a is screwed into the screw holes formed in the outer support plates 71 and 72 and the screw holes formed in the inner support plates 73 and 74.

A tie insertion hole 75a into which the tie rod 14 is inserted is formed in the connecting rod 75 (see Fig. 3). A plurality of tie insertion holes 75a are provided corresponding to the plurality of tie bars 14. The tie rod 14 extending with the mold clamping force is fixed to the skeleton 70 of the rear pressure plate 13, so that the rear pressure plate 13 is not easily bent at the time of mold clamping. Therefore, the uniform gap between the rear platen 13 and the adsorption plate 22 is maintained at the time of mold clamping, resulting in uniform adsorption force.

The rear platen 13 has a laminated steel plate in which a plurality of electromagnetic steel sheets are laminated between the two outer support plates 71 and 72 in order to reduce eddy current. Electromagnetic steel plate Thinner than the outer support plates 71, 72 or the inner support plates 73, 74. The electromagnetic steel sheet may be, for example, a steel sheet to which niobium is added. An insulating film is formed on the surface of the electromagnetic steel sheet.

For example, as shown in FIGS. 5 and 6, the rear platen 13 has two outer laminated steel plates 81 and 82 and two inner laminated steel plates 83 and 84.

One of the outer laminated steel sheets 81 is disposed between the outer support plate 71 and the inner support plate 73. The outer laminated steel plate 81 is formed by laminating a plurality of electromagnetic steel sheets 91 and 92 in the Y direction. As shown in Figs. 6(a) and 6(b), concave portions 91a and 92a constituting the coil grooves 45 are formed in the electromagnetic steel sheets 91 and 92. Further, the electromagnetic steel sheets 91 and 92 are formed with a plurality of through holes 91b and 92b through which the outer connecting rods 61 are inserted. The outer connecting rod 61 penetrates the outer laminated steel plate 81 in the stacking direction (Y direction), thereby positioning a plurality of electromagnetic steel sheets 91 and 92. The through holes 91b and 92b are disposed as far as possible from the adsorption surface (rear end surface) of the rear platen 13 so as not to adversely affect the magnetic field formed by the electromagnet 49.

The other outer laminated steel plate 82 is disposed between the outer support plate 72 and the inner support plate 74, and a plurality of electromagnetic steel sheets 91 and 92 are stacked in the Y direction in the same manner as the one outer laminated steel plate 81. The outer connecting rod 62 penetrates the outer laminated steel plate 82 in the stacking direction (Y direction), thereby positioning a plurality of electromagnetic steel sheets 91 and 92.

The two inner laminated steel plates 83 and 84 are disposed between the two inner support plates 73 and 74. The inner laminated steel sheets 83 and 84 are each formed by laminating a plurality of electromagnetic steel sheets 93 in the Y direction. As shown in Fig. 6(c), the electromagnetic steel sheet 93 is formed with a concave portion 93a constituting the coil groove 45. In addition, the electromagnetic steel plate 93 is shaped A plurality of through holes 93b through which the inner connecting rod 63 is inserted are formed. The through hole 93b is disposed as far as possible from the suction surface (rear end surface) of the rear platen 13 so as not to adversely affect the magnetic field formed by the electromagnet 49. The inner connecting rod 63 penetrates the inner laminated steel sheets 83 and 84 in the stacking direction (Y direction), thereby positioning a plurality of electromagnetic steel sheets 93.

The method of assembling the rear platen 13 of the above configuration includes, for example, the following processes (1) to (3). (1) A plurality of electromagnetic steel sheets 93 are arranged between the two inner support plates 73 and 74, and the two inner support plates 73 and 74 are connected to the inner connecting rods 63 of the plurality of electromagnetic steel sheets 93, and the two inner support plates 73 are supported. A plurality of electromagnetic steel sheets 93 are fastened between 74 and 74. The inner connecting rod 63 is configured not to protrude to the outside of the two inner supporting plates 73 and 74. (2) A plurality of electromagnetic steel sheets 91 and 92 are arranged between the inner side support plates 73 and 74 and the outer side support plates 71 and 72, and the inner side support plates 73 are connected to the outer side connecting rods 61 and 62 of the plurality of electromagnetic steel sheets 91 and 92. 74 and the support plates 71, 72, a plurality of electromagnetic steel sheets 91, 92 are fastened between the inner support plates 73, 74 and the outer support plates 71, 72. The outer connecting rod 61 is configured not to protrude to the inner side of the two inner supporting plates 73 and 74. (3) The outer support plates 71 and 72, the inner support plates 73 and 74, and the connecting rod 75 are fixed by bolts 77.

In the present embodiment, the outer laminated steel sheets 81 and 82 are sandwiched by the outer support plates 71 and 72 and the inner support plates 73 and 74 in the stacking direction (Y direction), and the inner laminated steel sheets 83 and 84 are placed in the stacking direction (Y direction). The inner support plates 73, 74 are clamped. Thereby, the separation of the plurality of electromagnetic steel sheets 91 to 93 due to the mold clamping can be suppressed. Since the plurality of electromagnetic steel sheets 91 to 93 are not connected by welding, there is no deterioration due to curing or embrittlement of the welded portion, It has high durability and high reliability due to residual stress in the welded portion and deformation due to welding.

The inner support plates 73 and 74 are interposed between the outer laminated steel plates 81 and 82 and the inner laminated steel plates 83 and 84. As shown in Fig. 4(b), the inner support plates 73 and 74 are internally formed with a temperature-regulating fluid. Flow path 74. Both of the outer laminated steel sheets 81 and 82 and the inner laminated steel sheets 83 and 84 can be tempered, and the rear pressure plate 13 can be effectively tempered from the inside. Since the inner side support plates 73 and 74 are thicker than the electromagnetic steel sheets and are easy to process, the flow paths 73d and 74d are easily formed.

The tempering fluid flowing through the flow paths 73d and 74d of the inner side support plates 73 and 74 may be a refrigerant such as cooling water. The rear platen 13 can be cooled, and overheating of the coil 48 of the electromagnet 49 can be suppressed.

The through hole 41 is divided by two inner laminated steel sheets 83 and 84 and two inner support plates 73 and 74 that sandwich the two inner laminated steel sheets 83 and 84 in the stacking direction (Y direction). The through hole 41 is a hole through which the rod 39 is inserted. Since the through hole 41 is formed by the temperature regulating plates, that is, the inner side support plates 73 and 74, the temperature adjustment of the rod 39 can be performed.

When viewed in the stacking direction (viewed in the Y direction), the inner connecting rods 63 penetrating the inner laminated steel sheets 83 and 84 in the laminating direction (Y direction) are inserted in the Y direction and the inner laminated steel sheets 83 and 84 in the laminating direction (Y direction). The outer side joining bars 61 and 62 of the outer side laminated steel plates 81 and 82 are disposed at intervals, and are disposed at different positions (positions that do not overlap). Since the connecting rods 61 to 63 as the supporting rods are disposed at the respective positions viewed in the stacking direction of the electromagnetic steel sheets, the outer supporting plates 71 and 72 or the inner supporting plates 73 and 74 are not easily poured. The platen 13 is not easily bent after the molding. Therefore, the uniform gap between the rear platen 13 and the adsorption plate 22 is maintained at the time of mold clamping, resulting in uniform adsorption force.

The outer connecting rod 61 is disposed at the same position as the outer connecting rod 62 as viewed in the stacking direction of the electromagnetic steel sheets, but may be disposed at different positions.

As shown in Fig. 4(a), flow paths 71d and 72d through which the temperature control fluid flows are formed inside the outer support plates 71 and 72. The outer laminated steel sheets 81 and 82 can be tempered, and the rear pressure plate 13 can be tempered from the outside. The outer support plates 71 and 72 are thicker than the electromagnetic steel sheets and are easy to process, and the flow paths 71d and 72d are easily formed.

The tempering fluid flowing through the flow paths 71d and 72d of the outer support plates 71 and 72 may be a refrigerant such as cooling water. The rear platen 13 can be cooled, and overheating of the coil 48 of the electromagnet 49 can be suppressed. The temperature control fluid can be supplied to the flow paths 71d and 72d of the outer support plates 71 and 72 from the same supply source as the flow paths 73d and 74d of the inner support plates 73 and 74.

The embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment, and various modifications and changes can be made within the scope of the invention as described in the claims.

For example, in the above embodiment, the present invention is applied to the rear platen 13, but the present invention can also be applied to the adsorption plate 22. For example, the adsorption plate 22 may have a laminated steel plate and a plurality of plates sandwiching the laminated steel sheets in the stacking direction. Further, the adsorption plate 22 may have a plurality of laminated steel sheets and a plate sandwiched between the plurality of laminated steel sheets. Further, the through hole 23 through which the rod 39 of the adsorption plate 22 is inserted can be sandwiched between two laminated steel sheets and the two laminated steel sheets in the stacking direction. 2 boards are divided.

Further, in the above embodiment, the flow paths 71a to 74a are formed on the outer support plates 71 and 72 and the inner support plates 73 and 74, respectively, but the flow path may be formed only in one of them.

Further, in the above embodiment, a refrigerant such as cooling water is used as the temperature control fluid, but a heat medium such as warm water may be used.

Further, in the above-described embodiment, one plate is disposed between two laminated steel sheets disposed at intervals in the Y direction, but a plurality of sets of laminated steel sheets may be disposed in the Y direction and sandwiched in the stacking direction (Y direction). A group of a plurality of plates of the laminated steel sheet. Further, only one set of laminated steel sheets and a plurality of sheets sandwiching the laminated steel sheets in the stacking direction (Y direction) may be provided.

13‧‧‧1st module

41‧‧‧through plate through hole

45‧‧‧ coil slot

62a‧‧‧Flange

71‧‧‧Outer support plate

71d‧‧‧Flow

72‧‧‧Outer support plate

72d‧‧‧Flow

73‧‧‧Inside support plate

73d‧‧‧Flow

74‧‧‧Inside support plate

74d‧‧‧Flow

75‧‧‧Connecting rod

81‧‧‧Outer laminated steel plate

82‧‧‧Outer laminated steel plate

83‧‧‧Inside laminated steel plate

84‧‧‧Inside laminated steel plate

91‧‧‧Electromagnetic steel plate

91a‧‧‧ recess

92‧‧‧Electromagnetic steel plate

92a‧‧‧ recess

93‧‧‧Electromagnetic steel plate

93a‧‧‧ recess

Claims (10)

An injection molding machine comprising: a first module in which an electromagnet is formed; and a second module that is adsorbed by the electromagnet; and the first module and the second module constitute a mold clamping force generating mechanism that generates a mold clamping force At least one of the first module and the second module includes a laminated steel sheet in which a plurality of electromagnetic steel sheets are stacked in a predetermined direction, and a plurality of sheets sandwiching the laminated steel sheets in the predetermined direction. The injection molding machine according to claim 1, wherein at least one of the first module and the second module further has a connection portion that connects the plurality of plates; and the connection portion penetrates the laminate in a stacking direction. Steel plate. An injection molding machine comprising: a first module in which an electromagnet is formed; and a second module that is adsorbed by the electromagnet; and the first module and the second module constitute a mold clamping force generating mechanism that generates a mold clamping force At least one of the first module and the second module includes a laminated steel sheet in which a plurality of electromagnetic steel sheets are stacked in a predetermined direction, and a plurality of sheets supporting the laminated steel sheets; and the plurality of laminated steel sheets are spaced apart from each other in a predetermined direction Arranged at intervals, the plurality of laminated steel sheets are sandwiched by the plurality of the plates in the predetermined direction. An injection molding machine comprising: a first module in which an electromagnet is formed, and a second module that is adsorbed by the electromagnet; and the first module and the second module are configured a mold clamping force generating mechanism that generates a mold clamping force; and at least one of the first module and the second module includes a laminated steel sheet in which a plurality of electromagnetic steel sheets are stacked in a predetermined direction, and the laminated steel sheet is sandwiched in the predetermined direction a plurality of plates; a plurality of sets of the above-mentioned laminated steel sheets and a group of the plurality of sheets are disposed along the predetermined direction. The injection molding machine according to the third aspect or the fourth aspect, wherein at least one of the first module and the second module further has a connection portion that connects the plurality of plates, and the connection portion is stacked. The laminated steel sheet is inserted through the laminated steel sheet in the stacking direction, and the other laminated steel sheet that is disposed in the stacking direction and penetrates the laminated steel sheet in the predetermined direction with a gap therebetween. The aforementioned connecting portions are disposed at different positions. The injection molding machine according to any one of the preceding claims, wherein at least one of the plates has a coil holding portion that holds a coil of the electromagnet. The injection molding machine according to any one of the first aspect, wherein the at least one of the first module and the second module is formed with a through hole. The through hole is divided by the two laminated steel sheets and the two sheets sandwiching the two laminated steel sheets in the predetermined direction. The injection molding machine according to any one of the preceding claims, wherein at least one of the plates is formed with a flow path through which a temperature-regulating fluid flows. The injection molding machine according to claim 8, wherein the temperature control fluid is a refrigerant. An injection molding machine comprising: a first fixing member to which a fixed mold is attached, a first movable member to which a movable mold is attached, a second movable member that moves together with the first movable member, and a second movable member a fixing member disposed between the first movable member and the second movable member; wherein the second movable member and the second fixed member form a mold clamping force generating mechanism, and the second movable member and the second movable member One of the fixing members is formed with an electromagnet, and the other is formed with an adsorption portion that is adsorbed by the electromagnet; and at least one of the second movable member and the second fixing member has a plurality of electromagnetic steel sheets stacked in a predetermined direction. The steel sheets are laminated, and a plurality of sheets of the laminated steel sheets are sandwiched in the predetermined direction.