TWI492832B - Injection Molding Machine and Injection Molding Machine - Google Patents

Description

Injection molding machine and injection molding machine die thickness adjustment method

The present invention relates to a mold thickness adjustment method for an injection molding machine and 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.

Therefore, a mold clamping device using an adsorption force of an electromagnet during a mold clamping operation using a linear motor during the opening and closing mode operation has been proposed. The clamping device comprises: a fixed pressing plate mounted with a fixed mold; a movable pressing plate mounted with a movable mold; an adsorption plate moving together with the movable pressing plate; and a rear pressing plate disposed between the movable pressing plate and the adsorption plate; a rod penetrating the rear platen to join the movable platen and the adsorption plate. If an adsorption force based on the electromagnet is generated between the rear platen and the adsorption plate, the adsorption force is transmitted to the movable platen through the rod, and a clamping force is generated between the movable platen and the fixed platen.

However, if the mold device is replaced, the thickness of the mold device may change, and the gap formed between the rear platen and the adsorption plate may occur at the end of the mold closing. Variety. When the gap changes, the adsorption force changes and the clamping force changes.

In this regard, a mold thickness adjusting portion for adjusting the interval between the movable platen and the suction plate according to the thickness of the mold device has been proposed (for example, see Patent Document 1). The mold thickness adjusting portion adjusts the interval between the movable platen and the suction plate in a state in which the movable mold abuts against the fixed mold, and adjusts the gap to a set value.

(previous technical literature) (Patent Literature)

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

Patent Document 1 proposes a mold thickness adjusting portion for adjusting the interval between the movable platen and the suction plate in accordance with the thickness of the mold device, but the details of the specific adjustment method are not mentioned.

The present invention has been made in view of the above problems, and an object thereof is to provide a mold thickness adjusting method for an injection molding machine and an injection molding machine suitable for replacing a mold device.

In order to achieve the above object, an injection molding machine according to aspect (1) of the present invention is characterized by comprising: a first fixing member to which a fixed mold is attached; and a first movable member to which a movable mold is attached; a second movable member that moves together with the first movable member, a second fixed member that is disposed between the first movable member and the second movable member, and an electromagnet that is formed on the second movable member and One of the second fixing members adsorbs the other to generate a clamping force; the mold thickness adjusting portion adjusts a distance between the first movable member and the second movable member; and a mold thickness adjustment processing portion that controls the mold thickness And a movement restricting portion that restricts movement of the second movable member toward the mold opening direction in a state where a predetermined gap is formed between the second movable member and the second fixing member, and the movement is restricted by the movement In a state in which the movement is restricted, the mold thickness adjustment processing unit drives the mold thickness adjustment unit to move the first movable member toward the mold closing direction, and is in contact with the first fixing member through the movable mold and the fixed mold. .

Further, the mold thickness adjustment method of the injection molding machine according to the aspect (2) 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 And 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 movable member and the second fixed One of the members, adsorbing the other to create a clamping force; A mold thickness adjusting unit that adjusts a gap between the first movable member and the second movable member to adjust a mold thickness of the injection molding machine, and is formed between the second movable member and the second fixed member The predetermined thickness and the movement of the second movable member in the mold opening direction are restricted, and the mold thickness adjusting portion is driven to move the first movable member toward the mold closing direction and to pass through the movable mold and the fixed mold. It is in contact with the first fixing member.

According to the present invention, it is possible to provide a mold thickness adjusting method of an injection molding machine and an injection molding machine suitable for replacing a mold 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 an injection molding machine, and Gd is a guide member composed of two guide rails laid on the frame Fr, 11 To fix the 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 move toward the mold opening and closing direction with respect to the fixed platen 11.

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. In addition, along with In the mold clamping, a cavity space (not shown) is formed between the fixed mold 15 and the movable mold 16, and a 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 suction plate 22 can move forward and backward more 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. And the magnetic core 34 has A plurality of magnetic pole teeth 33 projecting toward the stator 29 and formed at a predetermined pitch are provided, 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. Further, a current sensor 54 that detects a current value of a current supplied to the coil 35 is provided between the coil 35 and the power source.

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 suction 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. A current is supplied to the coil 35 of the linear motor 28 or the coil 48 of the electromagnet 49 in accordance with the result of calculation by the CPU. The 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.

However, when the mold device 19 is replaced, the thickness of the mold device 19 changes, and the gap δ formed between the rear platen 13 and the suction plate 22 at the end of the mold closing changes. When the gap δ changes, the adsorption force fluctuates and the clamping force changes.

Therefore, the injection molding machine includes a mold thickness adjusting portion 70 that can adjust 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 the rear end portion of the rod 39 is formed with a thread 43. The thread 43 can be screwed with a nut 73 that is rotatably supported by the suction plate 22. A gear (not shown) is formed on the outer peripheral surface of the nut 73, and this 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. Further, the current sensor 56 is provided between the mold thickness adjusting motor 71 and the power source, and detects a current value of a current supplied to the driving coil of the mold thickness adjusting motor 71.

If a predetermined current is supplied to drive the movable mold thickness adjusting motor 71, the screw The female 73 is rotated by a predetermined amount with respect to the thread 43 to adjust the position of the rod 39 with respect to the suction plate 22. Therefore, the interval between the movable platen 12 and the suction plate 22 is adjusted, and the gap δ at the end of the mold closing can be set to an optimum value.

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 mold thickness adjusting motor 71 is controlled by the feedback result of the encoding unit 71b so that the interval between the movable platen 12 and the suction plate 22 becomes a target value.

Next, the operation of the mold thickness adjusting unit 70 will be described based on Fig. 3 . The operation of the mold thickness adjusting unit 70 is controlled by the mold thickness adjustment processing unit 63 of the control device 60.

When the new movable mold 16 is attached to the movable platen 12 as the mold unit 19 is replaced, and the new fixed mold 15 is attached to the fixed platen 11, the control unit 60 drives the linear motor 28 to advance the suction plate 22 until the gap δ becomes The predetermined value (>0). At this time, the gap monitoring unit 64 of the control device 60 monitors the gap δ based on, for example, information from the position sensor 53. The position of the suction plate 22 is determined based on the position of the movable member 31 of the linear motor 28 detected by the position sensor 53 and the gap δ is determined. When the gap δ becomes a predetermined value, the movable mold 16 that advances together with the suction plate 22 and the movable platen 12 is not in contact with the fixed mold 15. The contact of the movable mold 16 with the fixed mold 15 is referred to as "mold contact".

Further, in order to prevent the gap δ from coming into contact with the mold before the predetermined value is reached, the mold thickness adjustment processing portion 63 may drive the mold thickness adjusting portion 70 to charge the gap between the suction plate 22 and the movable platen 12 before driving the linear motor 28. The narrowing is narrow. Further, when the elapsed time from the start of driving the linear motor 28 has reached the predetermined time and the gap δ does not reach the predetermined value, since the mold contact occurs, the mold thickness adjustment processing portion 63 can drive the mold thickness adjusting portion 70. The interval between the suction plate 22 and the movable platen 12 is narrowed.

Then, in a state where the movement restricting portion 65 of the control device 60 restricts the retraction of the suction plate 22, the mold thickness adjustment processing portion 63 drives the mold thickness adjusting portion 70 to advance the movable platen 12 (see FIG. 3) to move the movable mold 16 It is in contact with the fixed mold 15 (refer to Fig. 1).

When the mold thickness adjustment processing unit 63 drives the mold thickness adjustment unit 70 to increase the interval between the suction plate 22 and the movable platen 12, the movement restricting unit 65 drives the linear motor 28 to restrict the retraction of the suction plate 22, for example. Thereby, the movable platen 12 advances to make mold contact. The mold thickness adjustment is ended when the mold is in contact. In order to control the excessive driving of the mold thickness adjusting portion 70 after the mold is contacted, the control device 60 may further include a contact detecting portion 66 that detects the contact of the mold.

The contact detecting unit 66 detects the presence or absence of the mold contact by detecting the presence or absence of a reaction force generated by the contact of the mold or the presence or absence of a mold clamping force due to the contact of the mold.

(1) When a reaction force is generated by the contact of the mold, the driving force of the linear motor 28 for restricting the retreat of the suction plate 22 is increased. (2) When the driving force of the linear motor 28 reaches the upper limit and is weaker than the driving force of the mold thickness adjusting portion 70, the suction plate 22 moves backward. The above (1) to (2) occur when the driving force of the mold thickness adjusting portion 70 is higher than the driving force of the linear motor 28.

In the case of the above (1) to (2), the contact detecting unit 66 may also The presence or absence of a reaction force due to the contact of the mold is detected based on whether or not the driving force of the linear motor 28 is equal to or greater than a predetermined value. The driving force of the linear motor 28 is, for example, proportional to the current value of the current supplied to the coil 35 of the linear motor 28, and thus can be detected by the current sensor 54.

Further, in the case of the above (2), the contact detecting unit 66 may determine whether or not there is a reaction force generated by the contact of the mold, depending on whether or not the position of the suction plate 22 is retracted by a predetermined amount or more from the stop position. Since the position of the suction plate 22 is determined based on the position of the movable member 31 of the linear motor 28, it can be detected by the position sensor 53.

(3) When the reaction force is generated by the contact of the mold, the driving force of the mold thickness adjusting portion 70 is increased in order to advance the movable platen 12. The above (3) is caused when the driving force of the mold thickness adjusting portion 70 is lower than the driving force of the linear motor 28.

In the case of the above-described (3), the contact detecting unit 66 can detect whether or not the reaction force generated by the contact of the mold is detected based on whether or not the driving force of the mold thickness adjusting unit 70 is equal to or greater than a predetermined value. The driving force of the mold thickness adjusting portion 70 is detected by the current sensor 56 because it is proportional to the current value of the current supplied to the driving coil of the mold thickness adjusting motor 71, for example.

(4) The clamping force is generated by the contact of the mold. Therefore, the contact detecting unit 66 can also determine whether or not the mold is in contact based on whether or not the clamping force is equal to or greater than a predetermined value. The clamping force can be detected by the clamping force sensor 55.

In this manner, the contact detecting unit 66 detects the presence or absence of the mold contact based on the information from the position sensor 53, the current sensor 54, the current sensor 56, or the clamping force sensor 55, so that it is not necessary to detect the presence or absence of the mold. Mold connection Touch the dedicated sensor.

The mold thickness adjustment processing unit 63 drives the mold thickness adjustment unit 70 in a state where the movement of the suction plate 22 is restricted by the movement restricting portion 65 until the mold contact is detected by the contact detecting portion 66 in order to maintain the gap δ at a predetermined value. When the contact of the mold is detected by the contact detecting unit 66, the driving of the mold thickness adjusting unit 70 is released.

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, the movement restricting portion 65 of the above-described embodiment drives the linear motor 28 to restrict the retraction of the suction plate 22 in order to maintain the gap δ at a predetermined value. However, the retraction of the suction plate 22 can be restricted by the braking force of the brake device. The brake device is not particularly limited, and may be, for example, a device that brakes the slide base Sb with respect to the guide Gd. Thus, when the retraction of the suction plate 22 is restricted by the braking force of the brake device, the presence or absence of contact detection can be performed based on information from the current sensor 56 or the clamping force sensor 55.

Further, if the control device 60 of the above-described embodiment is mounted with the new mold device 19, the linear motor 28 is driven and the control for advancing the suction plate 22 to the predetermined position is performed, but the control can also temporarily fix the state of the new mold device 19. Go on. For example, this control can be performed in a state where the mold device 19 is temporarily fixed to the fixed platen 11 in a state where the movable mold 16 and the fixed mold 15 are uniformly lifted by a crane or the like. Then, the movable platen 12 is advanced to come into contact with the mold device 19, and then the mold device 19 is locked. mold. In the mold clamping state, the fixed mold 15 and the movable mold 16 are integrally fixed to the fixed pressure plate 11 and the movable pressure plate 12 by bolts or the like, respectively. Further, the mold device 19 may be temporarily fixed to the movable platen 12 instead of being fixed to the fixed platen 11.

Further, although the contact detecting unit 66 of the above-described embodiment detects the contact between the movable mold 16 and the fixed mold 15, the contact between the movable platen 12 that has passed through the movable mold 16 and the fixed mold 15 and the fixed platen 11 may be detected. For example, when the mold device 19 is temporarily fixed to the fixed platen 11, the contact detecting portion 66 may detect the contact between the movable platen 12 and the movable mold 16. Further, when the mold device 19 is temporarily fixed to the movable platen 12, the contact detecting portion 66 may detect the contact between the fixed die 15 and the fixed platen 11. In any case, a reaction force or a clamping force is generated by the contact, and therefore the contact detecting portion 66 can detect the presence or absence of contact based on information from the position sensor 53 or the like.

Further, although the mold thickness adjustment of the above embodiment is automatically performed by the control device 60, it may be manually performed.

Further, in the above-described embodiment, a predetermined gap δ is formed between the rear platen 13 and the suction plate 22 to restrict the retraction of the suction plate 22, and the mold thickness adjusting portion 70 is driven to advance the movable platen 12 to pass through the mold device 19. The mold thickness adjustment is performed by contacting the fixed platen 11, but the mold thickness adjustment may be performed by other methods. For example, the linear motor 28 can be detected to advance the movable platen 12 and pass through the gap when the mold device 19 comes into contact with the fixed platen 11, and the die thickness adjustment portion 70 is driven in response to the difference between the detected value and the target value, thereby performing the mold thickness adjustment. . When the detected value is less than the target value, In order to enlarge the gap, the mold thickness adjusting portion 70 can be driven to enlarge the interval between the movable platen 12 and the suction plate 22. The amount of the interval may be increased to be substantially the same as the absolute value of the difference between the detected value and the target value. Further, when the detected value is larger than the target value, in order to reduce the gap, the mold thickness adjusting portion 70 may be driven to reduce the interval between the movable platen 12 and the suction plate 22. The amount of the interval is reduced, and may be substantially the same as the absolute value of the difference between the detected value and the target value. The detection of the contact, the detection of the gap, and the like are performed by the same configuration as that of the above embodiment. For example, the detection of the contact is performed by the contact detecting unit 66, and the detection of the gap is performed by the gap monitoring unit 64, and the control of the mold thickness adjusting unit 70 is performed by the mold thickness adjustment processing unit 63. The target value is recorded on a recording medium such as a memory by using a test or the like in advance.

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)

39‧‧‧ pole

48‧‧‧ coil

49‧‧‧Electromagnet

53‧‧‧ position sensor

54‧‧‧Electromagnetic current sensor

55‧‧‧Clamping force sensor

56‧‧• Current sensor for the thickness adjustment unit

60‧‧‧Control device

61‧‧‧Mold opening and closing processing department

62‧‧‧Clocking Processing Department

63‧‧‧Mold thickness adjustment processing department

64‧‧‧Gap Monitoring Department

65‧‧‧Mobile Restriction Department

66‧‧‧Contact Detection Department

70‧‧‧Mold thickness adjustment department

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

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

Fig. 3 is an explanatory view showing the adjustment of the mold thickness of the injection molding machine according to the embodiment of the present invention.

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

17‧‧‧Injection device

18‧‧‧Injection nozzle

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

54‧‧‧Electromagnetic current sensor

55‧‧‧Clamping force sensor

56‧‧• Current sensor for the thickness adjustment unit

60‧‧‧Control device

61‧‧‧Mold opening and closing processing department

62‧‧‧Clocking Processing Department

63‧‧‧Mold thickness adjustment processing department

64‧‧‧Gap Monitoring Department

65‧‧‧Mobile Restriction Department

66‧‧‧Contact Detection Department

70‧‧‧Mold thickness adjustment department

71‧‧‧Mould thickness adjustment motor

71a‧‧‧ Output shaft

71b‧‧‧ coding department

72‧‧‧ Gears

73, n1‧‧‧ nuts

Ba‧‧‧ Position adjustment base

Bb‧‧‧ movable base

Fr‧‧ frame

Gd‧‧‧Guide

Sb‧‧‧ sliding base

Δ‧‧‧ gap

Claims (7)

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 fixed member a member disposed between the first movable member and the second movable member; and an electromagnet formed on one of the second movable member and the second fixed member, and adsorbing the other to generate a clamping force; a mold thickness adjusting portion that adjusts a distance between the first movable member and the second movable member; a mold thickness adjustment processing portion that controls the mold thickness adjusting portion; and a movement restricting portion that is in the second movable member and the first 2, in a state in which a predetermined gap is formed between the fixing members, the movement of the second movable member in the mold opening direction is restricted, and the mold thickness adjustment processing unit drives the mold thickness adjustment unit in a state where the movement is restricted by the movement restricting portion. The first movable member is moved in the mold closing direction, and is passed through the movable mold and the fixed mold to be in contact with the first fixing member. The injection molding machine according to claim 1, wherein the injection molding machine further includes a contact detecting unit that detects whether the first movable member and the first fixing member are in contact with each other through the movable mold and the fixed mold. , The mold thickness adjustment processing unit drives the mold thickness adjustment unit to move the first movable member in the mold closing direction until the contact is detected by the contact detection unit. The injection molding machine according to claim 2, wherein the contact detecting unit detects the presence or absence of the contact based on the presence or absence of a reaction force generated by the contact. The injection molding machine according to claim 2, wherein the contact detecting unit detects the presence or absence of the contact based on the presence or absence of a clamping force generated by the contact. The injection molding machine according to any one of claims 1 to 4, wherein the movable mold and the contact between the first movable member and the first fixing member of the fixed mold are the movable mold and The contact of the aforementioned fixed mold. The injection molding machine according to any one of claims 1 to 4, wherein the first movable member that is transmitted through the movable mold and the fixed mold is in contact with the first fixed member, and is the first movable member. The member is in contact with the movable mold or the first fixing member is in contact with the fixed mold. A method for adjusting a mold thickness of 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 fixed member that is disposed between the first movable member and the second movable member; Iron is formed in one of the second movable member and the second fixed member, and absorbs the other to generate a clamping force; and a mold thickness adjusting portion that adjusts a distance between the first movable member and the second movable member The method for adjusting the thickness of the injection molding machine is characterized in that a predetermined gap is formed between the second movable member and the second fixed member, and the movement of the second movable member toward the mold opening direction is restricted. Then, the mold thickness adjusting portion is driven to move the first movable member toward the mold closing direction, and is in contact with the first fixing member through the movable mold and the fixed mold.