TWI501857B - Injection molding machine - Google Patents

Description

Injection molding machine

The present invention relates to an injection molding machine.

The injection molding machine ejects the molten resin from the injection device, fills it in the cavity of the mold device, and solidifies it to form a molded article. The mold device is composed of a fixed mold and a movable mold. The mold closing, mold clamping and mold opening of the mold device are performed by a mold clamping device.

As a mold clamping device, a driving source such as a motor and a toggle mechanism are widely used. However, it is difficult to change the clamping force in the characteristics of the toggle mechanism, and the reactivity or stability is poor. Further, when the toggle mechanism is operated, a bending moment is generated, and the mounting surface of the mounting die device is strained.

For this reason, a mold clamping device that uses an adsorption force of an electromagnet during a mold clamping operation using a linear motor during the mold opening and closing operation has been proposed (for example, see Patent Document 1). In the mold clamping device, a current is supplied to the coil of the electromagnet under the control of the control unit.

(previous technical literature) (Patent Literature)

Patent Document 1: International Patent Publication No. 05/090052

The mold device is replaced according to the type of the molded article. When a new mold device is installed, the mold device is temporarily fixed to the mounting surface by bolts, the mold is closed, and the bolts are further tightened in the mold clamping state for formal fixing. Instead of bolts, a hydraulic or magnetic clamp device or the like can also be used.

Since the main fixing operation is performed by opening the door provided on the injection molding machine cover, in order to prevent an erroneous operation by the control unit, the current supply to the mold clamping device is automatically stopped in the state of opening the door.

In this state, the use of the toggle mechanism maintains the pre-generated clamping force, but the use of the electromagnet does not maintain the clamping force. Therefore, it is difficult to perform a formal fixing operation in the form of using an electromagnet.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an injection molding machine capable of mounting a mold device while stopping supply of current to a mold clamping device.

In order to achieve the above object, an injection molding machine according to an aspect of the present invention includes: a first fixing member to which a fixed mold is attached; a first movable member to which a movable mold is attached; and a second movable member; Moving together with the first movable member; the second fixing member is disposed between the first movable member and the second movable member; and the electromagnet is formed on the second fixed member and the second movable member One of them adsorbs the other to generate a clamping force; The adjustment unit adjusts a distance between the first movable member and the second movable member, and a movement restricting portion that restricts the second movable state while a predetermined gap is formed between the second movable member and the second fixed member a movement of the member toward the mold opening direction, and a control unit that moves the movement restricting portion to restrict the movement of the second movable member toward the mold opening direction, and drives the adjustment portion to move the first movable member toward the mold closing direction A predetermined clamping force is generated.

Further, an injection molding machine according to another aspect of the present invention includes: a first fixing member to which a fixed mold is attached; a first movable member to which a movable mold is attached; and a second movable member to which the second movable member is attached (1) the movable member moves together; the second fixing member is disposed between the first movable member and the second movable member; and the electromagnet is formed on one of the second fixed member and the second movable member. The other is adsorbed to generate a clamping force; the adjusting portion adjusts a distance between the first movable member and the second movable member; and the movement restricting portion forms a predetermined gap between the second fixed member and the second movable member a state in which the movement of the second movable member toward the mold opening direction is restricted, and a control unit that drives the movement of the electromagnet to move the movement restricting portion to restrict the movement of the second movable member toward the mold opening direction. Take The predetermined clamping force is maintained.

According to the present invention, it is possible to provide an injection molding machine capable of mounting a mold device while stopping supply of current to the mold clamping device.

In the following, the embodiments for carrying out the invention will be described with reference to the accompanying drawings. 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 in which the injection molding machine according to the embodiment is closed when the mold is closed. Fig. 2 is a view showing a state in which the injection molding machine according to an embodiment of the present invention is opened.

In the figure, 10 is a mold clamping device, Fr is a frame of the injection molding machine, Gd is a guide member composed of two guide 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). Further, the fixed platen 11 may 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 opposite The fixed platen 11 is moved toward the mold opening and closing direction.

A rear platen (second fixing member) 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 by the leg portion 13a.

Four connecting rods 14 (only two of the four connecting rods 14 are shown in the drawing) are bridged between the fixed platen 11 and the rear platen 13. The fixed platen 11 is fixed to the rear platen 13 by a connecting rod 14. The movable platen 12 is disposed to retreat freely along the connecting rod 14. A guide hole (not shown) through which the connecting rod 14 is inserted is formed in a portion of the movable platen 12 corresponding to the connecting rod 14. In addition, a notch portion may be formed instead of the guide hole.

A screw portion (not shown) is formed at a distal end portion (right end portion in the drawing) of the connecting rod 14, and the distal end portion of the connecting rod 14 is fixed to the fixed pressure plate 11 by screwing the nut n1 to the screw portion. The rear end portion of the connecting rod 14 is fixed to the rear pressure plate 13.

The fixed mold 15 and the movable mold 16 are attached to the fixed platen 11 and the movable platen 12, respectively, and the fixed mold 15 and the movable mold 16 are contacted and separated with the advancement and retraction of the movable platen 12 to perform 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 (not shown) which is emitted from the injection nozzle 18 of the injection device 17 is filled in the cavity space. The mold device 19 is constituted by the fixed mold 15 and the movable mold 16.

The suction plate 22 (second movable member) is disposed in parallel with the movable platen 12. The suction plate 22 is fixed to the slide base Sb by a mounting plate 27, and the slide base Sb can travel on the guide Gd. Thereby, the adsorption plate 22 is It is more backward and backward than the rear pressure plate 13. The adsorption plate 22 can also be formed of a magnetic material. Alternatively, the mounting plate 27 may not be used. 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 as the suction plate 22 retreats at the time of mold opening, and the movable platen 12 retreats. To this end, a rod hole 41 for penetrating the rod 39 is formed in a central portion of the rear platen 13.

The linear motor 28 is a mold opening and closing drive unit for moving the movable platen 12 forward and backward, and 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 movable member 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 movable member 31 is formed to face the stator 29 at a lower end of the slide base Sb and to span a predetermined range.

The mover 31 includes a magnetic core 34 and a coil 35. Further, the magnetic core 34 includes a plurality of magnetic pole teeth 33 that protrude toward the stator 29 and are formed at a predetermined pitch, and the coils 35 are wound around the respective magnetic pole teeth 33. Further, the magnetic pole teeth 33 are formed to be parallel to each other in a direction perpendicular to the moving direction of the movable platen 12. Further, the stator 29 includes a magnetic core (not shown) and a permanent magnet (not shown) formed by extending the magnetic core. The permanent magnet is formed by alternately magnetizing the magnetic poles of the N pole and the S pole. A position sensor 53 that detects the position of the movable member 31 is disposed.

When the linear motor 28 is driven by supplying a predetermined current to the coil 35, the movable member 31 is advanced and retracted. As a result, the suction plate 22 and the movable platen 12 are advanced and retracted, and the mold can be closed and opened. The linear motor 28 is fed back in response to the detection result of the position sensor 53 so that the position of the movable member 31 becomes a set value.

Further, in the present embodiment, the permanent magnet is disposed on the stator 29, and the coil 35 is disposed on the movable member 31. However, the coil may be disposed on the stator and the permanent magnet may be disposed on the movable member. . In this case, since the coil does not move with the driving of the linear motor 28, the wiring for supplying electric power to the coil can be easily performed.

Further, instead of the linear motor 28, 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 can be used as the mold opening and closing drive unit.

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

Further, the mold clamping device 10 is constituted by 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 rod 39, and the like.

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 a predetermined portion formed on the adsorption surface (front end surface) of the adsorption plate 22, and is formed, for example, in a portion of the adsorption plate 22 that surrounds the rod 39 and faces the electromagnet 49. Further, a predetermined portion of the adsorption surface (rear end portion) of the rear platen 13 For example, a groove 45 for accommodating the coil 48 of the electromagnet 49 is formed around the rod 39. The magnetic core 46 is formed on the inner side of the groove 45. The coil 48 is wound around the magnetic core 46. 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. However, the electromagnet may be formed as a part of the rear platen 13 as a part of the adsorption plate 22. An adsorption portion is formed. Further, the electromagnet and the adsorption portion may be arranged in reverse. For example, the electromagnet 49 may be provided on the side of the adsorption plate 22, and the adsorption portion 51 may 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 to adsorb the adsorption portion 51, and a clamping force can be generated.

The drive of the linear motor 28 and the electromagnet 49 of the mold clamping device 10 is controlled by the control device 60. The control device 60 includes a CPU, a memory, and the like, and supplies a current to the coil 35 of the linear motor 28 or the coil 48 of the electromagnet 49 as a result of calculation by the CPU. A clamping force sensor 55 is connected to the control device 60. The clamping force sensor 55 is a predetermined position (a predetermined position between the fixed platen 11 and the rear platen 13) provided in the at least one connecting rod 14 of the clamping device 10 for detecting the load applied to the connecting rod 14. . The clamping force sensor 55 is constituted by, for example, a strain gauge or the like including the amount of elongation of the detecting connecting rod 14. The load detected by the clamping force sensor 55 is transmitted to the control device 60.

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

The mold closing process is controlled by the mold opening and closing processing unit 61 of the control device 60. In the state of the second drawing (the state of the mold opening), the mold opening and closing processing unit 61 supplies a current to the coil 35 to drive the linear motor 28. As shown in Fig. 1, the movable platen 12 advances to bring the movable die 16 into contact with the fixed die 15. 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 mold clamping processing unit 62 of the control device 60 controls the mold clamping process. The mold clamping processing unit 62 supplies a current to the coil 48 of the electromagnet 49, and adsorbs the adsorption unit 51 to the electromagnet 49. This suction force is transmitted to the movable platen 12 via the rod 39, and a clamping force is generated between the movable platen 12 and the fixed platen 11.

The clamping force is detected by the clamping force sensor 55. The detected clamping force is transmitted to the control device 60, and the mold clamping processing unit 62 adjusts the current supplied to the coil 48 in order to set the clamping force to a set value, and performs feedback control. During this period, the molten resin melted in the injection device 17 is emitted from the injection nozzle 18 and filled in the cavity space of the mold device 19.

When the resin in the cavity space is cooled and solidified, the die opening and closing processing portion 61 controls the mold opening process. In the state of Fig. 1, the mold clamping processing unit 62 stops supplying current to the coil 48 of the electromagnet 49. Accordingly, the linear motor 28 is driven, and the movable platen 12 is retracted. As shown in Fig. 2, the movable mold 16 is retracted to perform mold opening.

Next, the replacement of the mold device 19 is performed according to the third and fourth figures. Industry to explain. Fig. 3 shows a state in which the pin 82 is inserted into the pin hole 81 after the temporary fixing operation of the mold device 19. Fig. 4 shows a state in which a predetermined clamping force is generated.

When the mold device 19 is replaced, the new mold device 19 is temporarily fixed to the fixed platen 11 by bolts while being suspended by a crane or the like. Thereafter, the movable platen 12 is advanced to come into contact with the mold device 19, and then the mold device 19 is mold-locked. In the mold clamping state, the fixed mold 15 and the movable mold 16 are integrally fixed to the fixed platen 11 and the movable platen 12 by bolts or clamp devices, respectively. Since the main fixing operation is performed by opening the door provided on the injection molding machine cover, the state in which the current supply to the mold clamping device 10 is stopped (hereinafter also referred to as "stop state") is performed. This is to prevent an erroneous operation caused by the control unit 60. The stop state may be an automatic manner in which the operation is a drive source for the feedback control (for example, the electromagnet 49, the linear motor 28, and the mold thickness adjustment motor 71 to be described later) based on the detection results of the various detectors. Stop servo off state. In the stopped state, since the power supply to the coil 48 of the electromagnet 49 is blocked, the adsorption force generated by the electromagnet 49 does not occur.

Further, when the thickness of the mold device 19 is changed when the mold device 19 is replaced, the interval between the movable platen 12 and the suction plate 22 at which the gap δ 0 becomes the target value at the end of the mold closing is changed. The gap δ 0 is set as the target value at the end of the mold closing in order to efficiently obtain a predetermined clamping force. When the gap δ 0 is too wide at the end of the mold closing, the current supplied to the coil 48 to obtain a predetermined clamping force becomes excessive. When the gap δ 0 is too narrow at the end of the mold closing, the suction plate 22 comes into contact with the rear pressure plate 13 during the adsorption, and a part of the adsorption force cannot be transmitted to the movable platen 12 via the rod 39.

Therefore, the injection molding machine is provided with the mold thickness adjusting portion 70 and the lock as the movement restricting portion in order to perform the main fixing operation in the stopped state and to adjust the interval between the movable platen 12 and the suction plate 22 in accordance with the thickness of the mold device 19. Pin portion 80.

The mold thickness adjusting portion 70 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 70 is composed of a mold thickness adjusting motor 71, a gear 72, a nut 73, a rod 39, and the like. The rod 39 penetrates the central portion of the suction plate 22, and a thread 43 is formed at the rear end portion of the rod 39. The screw 43 is screwed to the nut 73 rotatably supported by the suction plate 22. A gear (not shown) is formed on the outer circumferential surface of the nut 73, and the gear meshes with the gear 72 attached to the output shaft 71a of the mold thickness adjusting motor 71. The nut 73 and the screw 43 constitute a movement direction changing portion in which the rotational motion of the nut 73 is converted into the linear motion of the rod 39.

When a predetermined current is supplied to drive the mold thickness adjusting motor 71, the nut 73 is rotated by a predetermined amount with respect to the screw 43, thereby adjusting the position of the rod 39 with respect to the suction plate 22. Thereby, the interval between the movable platen 12 and the suction plate 22 can be adjusted.

The mold thickness adjustment motor 71 may be a servo motor or may include an encoder portion 71b that detects the amount of rotation of the output shaft 71a of the mold thickness adjustment motor 71. The current supplied to the driving coil of the mold thickness adjusting motor 71 is feedback-controlled according to the detection result of the encoding unit 71b so that the interval between the movable platen 12 and the suction plate 22 becomes a target value.

Further, the mold thickness adjusting motor 71 may be a motor with a brake attached thereto. The braking portion 71c of the mold thickness adjusting motor 71 may have a general configuration, and is constituted, for example, by an electromagnetic brake including an electromagnet. When the brake coil of the electromagnet is energized, the electromagnetic brake allows the output shaft 71a of the mold thickness adjustment motor 71 to rotate, and when the brake coil is not energized, the rotation of the output shaft 71a is restricted. Further, the brake portion 71c may have a pneumatic cylinder or the like as a drive source instead of the electromagnet, and is not limited to the electromagnetic brake.

The lock pin portion 80 restricts the retreat of the suction plate 22 in a state where a predetermined gap δ 1 (hereinafter referred to as "initial gap δ 1") is formed between the rear platen 13 and the suction plate 22. The lock pin portion 80 is disposed between the fixed side member and the movable side member. For example, the lock pin portion 80 is constituted by a pin hole 81 formed in the fixed side member, a pin 82 provided on the movable side member, and the like.

The pin hole 81 is formed, for example, on the frame Fr. The pin hole 81 is formed to be slightly larger than the pin 82. The pin holes 81 may be formed in plural at intervals in the front-rear direction (only one is shown in the drawing). Further, the pin hole 81 may be formed in the guide Gd or the like instead of being formed on the frame Fr, and the member on the fixed side of the pin hole 81 is not particularly limited.

When the pin 82 is pulled out from the pin hole 81, the suction plate 22 is allowed to retreat, and when the pin hole 81 is inserted, the retraction of the suction plate 22 is restricted. Since the movable platen 12 can be advanced while restricting the retraction of the suction plate 22, the pin 82 can be supported by a member of the movable side member that is disposed on the suction plate 22 side with respect to the rod 39. For example, the pin 82 is supported on the slide base Sb so as not to advance and retreat.

In addition, the pin hole 81 and the pin 82 may be disposed oppositely, and the pin hole 81 may also be disposed. It is provided to the movable side member, and the pin 82 is provided to the fixed side member.

The lock pin portion 80 may further include a guide portion 83 that guides the pin 82 in the insertion and removal direction, a drive portion 84 that moves the pin 82 in the insertion and removal direction, and the like. The guide portion 83 includes, for example, a guide hole formed in the slide base Sb. The driving portion 84 may be of an electric type or a hydraulic type, and is fixed to the sliding base Sb, for example.

Next, an operation of the mold thickness adjusting unit 70 and the lock pin unit 80 having the above configuration will be described. This operation is performed after the temporary fixing operation of the mold device 19 shown in Fig. 3 . The operation of the mold thickness adjusting unit 70 is controlled by the mold thickness adjustment processing unit 63 of the control unit 60, and the operation of the lock pin unit 80 is controlled by the lock pin processing unit 64 of the control unit 60.

First, the control unit 60 drives the linear motor 28 in order to align the pin 82 with the pin hole 81. After the alignment, the lock pin processing unit 64 drives the drive unit 84 to insert the pin 82 into the pin hole 81. Thereby, the retraction of the adsorption plate 22 is restricted in a state in which the initial gap δ 1 is formed. At this time, the movable platen 12 is not in contact with the mold device 19.

Next, the mold thickness adjustment processing unit 63 drives the mold thickness adjustment unit 70 to enlarge the interval between the movable platen 12 and the suction plate 22. Since the retraction of the suction plate 22 is restricted, the movable platen 12 advances and is in contact with the fixed platen 11 through the movable die 16 and the fixed die 15.

Next, the mold thickness adjustment processing unit 63 drives the mold thickness adjustment unit 70 to press the movable mold 16 against the fixed mold 15 to generate a predetermined mold clamping force. At this time, since the connecting rod 14 is extended, the movable platen 12 is further advanced to further widen the interval between the movable platen 12 and the suction plate 22.

The mold clamping force is also maintained by the lock pin portion 80 after the mold thickness adjusting portion 70 is driven to stop. Thereby, the mold clamping force can be maintained in the state in which the door is opened, that is, in the stopped state, so that the main fixing operation of the mold device 19 can be performed.

In the stopped state, the clamping force can be maintained by restricting the rotation of the nut 73 in the direction in which the clamping force is released by the braking force of the braking portion 71c. In addition, the friction of the nut 73 and the thread 43 can also somewhat restrict the rotation of the nut 73.

When the door is closed after the main fixing operation of the mold device 19, the stop state is automatically released. Thereafter, the lock pin processing unit 64 drives the drive unit 84 to pull out the pin 82 from the pin hole 81, and releases the movement restriction of the suction plate 22 formed by the lock pin unit 80.

Therefore, when the door is closed, since the clamping force is still maintained, the pin 82 is pressed against the rear end (left end in the drawing) of the pin hole 81 by the clamping force. Further, when the arrangement of the pin 82 and the pin hole 81 is reversed, the front end of the pin hole 81 is pressed against the pin 82.

Here, when the movement restriction of the adsorption plate 22 formed by the lock pin portion 80 is released, the control portion 80 can drive the electromagnet 49 to adsorb the adsorption plate 22 to the rear pressure plate 13. Since the pin 82 is pressed forward by the suction force, the force for pressing the pin 82 toward the rear end of the pin hole 81 is alleviated, so that the pin 82 can be easily pulled out from the pin hole 81. The current value of the current supplied to the coil 48 of the electromagnet 49 is controlled so as not to excessively press the pin 82 toward the front by the suction force.

If the pin 82 is pulled out of the pin hole 81, the replacement of the mold device 19 is performed. The industry is over. Thereafter, injection molding using the new mold device 19 can be performed.

However, if a clamping force is applied to the mold device 19, the connecting rod 14 is elongated. When the clamping force is released, the fixed pressing plate 11, the mold device 19, the movable platen 12, and the suction plate 22 are integrally retracted due to the elastic recovery of the connecting rod 14, resulting in a gap formed between the suction plate 22 and the rear platen 13. expand. Therefore, the gap δ 0 (see Fig. 1) at the end of the mold closing is expanded to be substantially the same as the elongation of the connecting rod 14 at the time of the main fixing operation, compared with the initial gap δ 1 (see Figs. 3 and 4). the amount.

Therefore, the initial gap δ 1 can be set to be narrower than the target value of the gap δ 0 at the end of the closed mold by approximately the same amount as the above-described elongation. After the mold is replaced, it is not necessary to perform the operation of closing the gap δ 0 at the end of the mold closing to the target value. The amount of elongation described above can be obtained by a test or the like, and can also be detected by the mold clamping force sensor 55.

The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications and changes can be made to the above-described embodiments without departing from the scope of the invention.

For example, in the above embodiment, while the lock pin portion 80 restricts the retraction of the suction plate 22, the mold thickness adjusting portion 70 is driven to generate the mold clamping force, but the electromagnet 49 may be driven to generate the mold clamping. After the force, the retraction of the suction plate 22 is restricted by the lock pin portion 80. Since the lock pin portion 80 restricts the retraction of the suction plate 22 after the electromagnet 49 stops driving, the predetermined clamping force can be maintained. Therefore, the mold clamping force can be maintained in the state in which the door is opened, that is, in the stopped state, so that the main fixing operation of the mold device 19 can be performed. In this modification, as in the above-described embodiment, since the connecting rod 14 is extended during the main fixing operation, the initial gap δ 1 can be set to be narrower than the target value of the gap δ 0 at the end of the closing of the mold. In this modification, the mold hole adjusting portion 70 can be driven in accordance with the thickness of the mold device 19 to align the pin hole 81 and the pin 82. Further, in this modification, the retraction of the suction plate 22 can be restricted by restricting the retraction of the movable platen 12 or the rod 39, and the member on the movable side of the pin 82 is not particularly limited. The pin hole 81 and the pin 82 can also be arranged in reverse.

Further, in the above-described embodiment and the modified example, after the pin 82 is inserted into the pin hole 81, the mold thickness adjusting portion 70 can be driven to press the pin 82 toward the rear end of the pin hole 81. In this case, the pin hole 81 may be an elongated hole that lengthens in the front-rear direction, so that the alignment accuracy of the pin hole 81 and the pin 82 can be alleviated.

Further, in the above-described embodiment and the modified example, the movement restricting portion may be constituted by a general brake or the like instead of the lock pin portion, and the configuration of the movement restricting portion is not particularly limited.

10‧‧‧Clamping device

11‧‧‧Fixed platen (1st fixing member)

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

13‧‧‧ Rear platen (2nd fixing member)

15‧‧‧Fixed mode

16‧‧‧ movable mold

22‧‧‧Adsorption plate (2nd movable member)

37‧‧‧Electromagnetic unit

49‧‧‧Electromagnet

60‧‧‧Control device

70‧‧‧Mold thickness adjustment department

71‧‧‧Mould for thickness adjustment (drive motor)

71c‧‧‧Brake

80‧‧‧Locking Department (Moving Restriction Department)

81‧‧ ‧ pinhole

82‧‧ ‧ sales

Fig. 1 is a view showing a state in which the injection molding machine according to the first embodiment is closed when the present invention is closed.

Fig. 2 is a view showing a state in which the injection molding machine according to the first embodiment is opened when the mold is opened.

Fig. 3 is an explanatory diagram (1) of the replacement work of the mold device.

Fig. 4 is an explanatory view (2) of the replacement work of the mold device.

10‧‧‧Clamping device

11‧‧‧Fixed platen (1st fixing member)

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

13‧‧‧ Rear platen (2nd fixing member)

13a‧‧‧foot

14‧‧‧ Connecting rod

15‧‧‧Fixed mode

16‧‧‧ movable mold

19‧‧‧Molding device

22‧‧‧Adsorption plate (2nd movable member)

27‧‧‧Installation board

28‧‧‧Linear motor

29‧‧‧ Stator

31‧‧‧ movable parts

33‧‧‧Magnetic teeth

34, 46‧‧‧ magnetic core

35, 48‧‧‧ coil

37‧‧‧Electromagnetic unit

39‧‧‧ pole

41‧‧‧ rod holes

43‧‧‧Thread

45‧‧‧ slots

47‧‧‧Y yoke

49‧‧‧Electromagnet

51‧‧‧Adsorption Department

53‧‧‧ position sensor

55‧‧‧Clamping force sensor

60‧‧‧Control Department

61‧‧‧Mold opening and closing processing department

62‧‧‧Clocking Processing Department

63‧‧‧Mold thickness adjustment processing department

64‧‧‧Lock Processing Department

70‧‧‧Mold thickness adjustment department

71‧‧‧Mould for thickness adjustment (drive motor)

71a‧‧‧ Output shaft

71b‧‧‧ coding department

71c‧‧‧Brake

72‧‧‧ Gears

73, n1‧‧‧ nuts

80‧‧‧Lock Department

81‧‧ ‧ pinhole

82‧‧ ‧ sales

83‧‧‧ Guidance Department

84‧‧‧ Drive Department

Ba‧‧‧ Position adjustment base

Bb‧‧‧ movable base

Fr‧‧ frame

Gd‧‧‧Guide

Sb‧‧‧ sliding base

δ 1‧‧‧ initial gap

Claims (5)

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; and a second movable member that moves together with the first movable member; a fixing member disposed between the first movable member and the second movable member; and an electromagnet formed on one of the second fixed member and the second movable member, and adsorbing the other to generate a clamping force An adjustment unit that adjusts a distance between the first movable member and the second movable member, and a movement restricting portion that restricts the second state in a state where a predetermined gap is formed between the second movable member and the second fixed member a movement of the movable member toward the mold opening direction; and a control unit that moves the movement restricting portion to restrict the movement of the second movable member toward the mold opening direction, and drives the adjustment portion to move the first movable member toward the mold closing direction. Thereby a predetermined clamping force is generated. 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; and a second movable member that moves together with the first movable member; a fixing member disposed between the first movable member and the second movable member; and an electromagnet formed on the second fixing member and the second movable structure One of the members absorbs the other to generate a clamping force; the adjustment portion adjusts a distance between the first movable member and the second movable member; and the movement restricting portion is the second fixed member and the second movable member The second movable member is restricted from moving toward the mold opening direction while a predetermined gap is formed therebetween, and the control portion is configured to operate the movement restricting portion to restrict the second movable member after the electromagnet is driven to generate a clamping force. Moving toward the mold opening direction to maintain a predetermined clamping force. The injection molding machine according to claim 1 or 2, wherein, when the movement restriction by the movement restricting portion is released, the control unit drives the electromagnet to adsorb the second movable member to the first 2 fixed components. The injection molding machine according to the first or second aspect of the invention, wherein the adjustment unit includes a drive motor with a brake, and maintains a predetermined clamping force by a braking force of the brake. The injection molding machine according to claim 3, wherein the adjustment unit includes a drive motor with a brake, and maintains a predetermined clamping force by a braking force of the brake.