TWI586514B - Injection molding machine - Google Patents

Description

Injection molding machine

The present invention relates to an injection molding machine.

In the injection molding machine, a molten resin is injected from an injection device and filled in a cavity of a mold device, and is solidified to be molded into 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 apparatus are performed by a mold clamping device.

As a mold clamping device, a drive source such as a motor and a toggle mechanism are widely used. However, it is difficult to change the mold clamping force in the characteristics of the toggle mechanism, and the responsiveness or stability is poor. Further, a bending moment is generated when the toggle mechanism operates, and the mounting surface of the mounting die device or the like may be deformed.

Therefore, a mold clamping device that uses an adsorption force of an electromagnet for a mold clamping operation using a linear motor for a mold opening and closing operation has been proposed. The mold clamping device comprises: a fixed pressure plate, a fixed mold is installed; a movable pressure plate is mounted with a movable mold; an adsorption plate moves together with the movable pressure plate; a rear pressure plate is disposed between the movable pressure plate and the adsorption plate; and the rod passes through The pressure plate is used to connect 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 mold 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 suction plate at the end of the mold closing may be changed. If the gap changes, the adsorption force changes and the clamping force changes. Chemical.

On the other hand, a mold thickness adjusting portion that adjusts the distance between the movable platen and the suction plate in accordance with the thickness of the mold device has been proposed (see, for example, Patent Document 1). The mold thickness adjusting portion adjusts the interval between the movable platen and the suction plate while the movable mold is in contact with the fixed mold, thereby adjusting the gap to a set value.

(previous technical literature) (Patent Literature)

Patent Document 1: International Publication No. 05/090052

After the interval between the movable platen and the suction plate is adjusted according to the thickness of the mold device, the state of the injection molding machine (for example, the state of the mold device, the state of the electromagnet, etc.) may vary. Therefore, in order to obtain a predetermined mold clamping force, the current supplied to the coil of the electromagnet may increase, resulting in a decrease in mold clamping efficiency.

The present invention has been made in view of the above problems, and an object of the invention is to provide an injection molding machine capable of improving mold clamping efficiency when the state of the injection molding machine is changed after the mold thickness is adjusted.

In order to solve the above object, an injection molding machine according to aspect (1) of the present invention is characterized by comprising: a fixed mold is attached to the first fixing member; a movable mold is attached to the first movable member; the second movable member moves together with the first movable member; and the second fixed member is disposed in the first movable member and the first 2 between the movable members; the electromagnet is formed on one of the second movable member and the second fixed member, and the other is adsorbed to generate a predetermined clamping force; and the gap detecting portion is formed at the end of the closed mold. (2) whether a gap between the movable member and the second fixing member exceeds a predetermined value; a mold thickness adjusting portion adjusts a gap between the first movable member and the second movable member; and a mold thickness adjustment processing portion controls the mold thickness adjusting portion When the gap detecting unit detects that the gap exceeds a predetermined value, the mold thickness adjustment processing unit drives the mold thickness adjusting unit to reduce the interval.

Further, the injection molding machine according to 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 to be movable to the first movable member The 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 movable member and the second fixed member, and the other is adsorbed Produce a given clamping force; The current detecting unit detects whether or not the current value of the coil supplied to the electromagnet exceeds a predetermined value during the mold clamping; the mold thickness adjusting unit adjusts a distance between the first movable member and the second movable member; and a mold thickness adjustment processing unit; The mold thickness adjustment unit controls the mold thickness adjustment unit to drive the mold thickness adjustment unit to reduce the interval when the current detection unit detects that the current value exceeds a predetermined value.

Further, the injection molding machine according to aspect (3) 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 the first movable member The 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 movable member and the second fixed member, and the other is adsorbed a predetermined mold clamping force is generated; the temperature detecting unit detects whether the temperature of the electromagnet exceeds a predetermined temperature during mold clamping; and the mold thickness adjusting unit adjusts a distance between the first movable member and the second movable member; and a mold thickness adjustment process The mold thickness adjustment unit controls the mold thickness adjustment unit, and when the temperature detection unit detects that the temperature exceeds a predetermined temperature, the mold thickness adjustment processing unit drives the mold thickness adjustment unit to reduce the Separate.

According to the present invention, there is provided an injection molding machine capable of improving mold clamping efficiency when the state of the injection molding machine is changed after the mold thickness is adjusted.

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 at the time of mold closing of the injection molding machine according to the embodiment of the present invention. 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.

In the figure, 10 is a mold clamping device, Fr is a frame of an 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 a position adjusting base Ba that is movable along a guide member Gd that extends 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 seat Bb, and the movable seat Bb can travel on the guide Gd. Thereby, the movable platen 12 can be relatively solid The constant pressure plate 11 moves in 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 through 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 through the tie rod 14. The movable platen 12 is disposed to move forward and backward along the tie rod 14. A guide hole (not shown) through which the tie rod 14 is inserted is formed in a portion of the movable platen 12 corresponding to the tie bar 14. In addition, a notch portion may be formed instead of the via hole.

A screw portion (not shown) is formed at a distal 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 distal 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.

The fixed mold 15 and the movable mold 16 are respectively mounted on the fixed platen 11 and the movable platen 12. The fixed mold 15 and the movable mold 16 are contacted or separated as the movable platen 12 advances and retreats, and the mold is closed, closed, and opened. 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 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 unit 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 seat Sb through the mounting plate 27, and the slide seat 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 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 seat 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. Therefore, a rod hole 41 through which the rod 39 is inserted is formed in the central portion of the rear platen 13.

The linear motor 28 is a mold opening and closing drive unit for advancing and retracting the movable platen 12, and is disposed, for example, between the suction plate 22 and the frame Fr that are coupled to the movable platen 12. 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 seat Sb. The mover 31 is formed to face the stator 29 at a lower end of the slide seat Sb and to extend over a predetermined range.

The mover 31 includes a core 34 and a coil 35. Further, the 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 coil 35 is wound around each of the 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 core (not shown) and a permanent magnet (not shown) that is formed to extend over the 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.

The linear motor 28 is driven by supplying a predetermined current to the coil 35, and 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 mold closing and mold opening can be performed. The linear motor 28 is feedback-controlled based on 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. At this time, 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, 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 as the mold opening and closing drive unit.

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 through the rod 39, and a mold 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 includes 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 unit 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 portion) of the rear platen 13, for example, around the rod 39 The groove 45 of the coil 48 that houses the electromagnet 49. The core 46 is formed on the inner side of the groove 45. The coil 48 is wound around the core 46. A portion other than the 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, an electromagnet may be formed as a part of the rear platen 13, and adsorption may be formed as a part of the adsorption plate 22. unit. 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.

When the current is supplied to the coil 48 in the electromagnet unit 37, the electromagnet 49 is driven to adsorb the adsorption portion 51, thereby generating a mold clamping force.

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 based on the result of the CPU calculation. The control device 60 is coupled to the mold clamping force sensor 55. The mold clamping force sensor 55 is provided at a predetermined position (a predetermined position between the fixed pressure plate 11 and the rear pressure plate 13) of at least one tie rod 14 in the mold clamping device 10, and detects the load applied to the tie rod 14. The mold clamping force sensor 55 includes, for example, a strain gauge or the like that detects the elongation of the tie rod 14. The load detected by the mold clamping force sensor 55 is sent 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, and the movable mold 16 abuts against the fixed mold 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 mold clamping force.

Next, the mold clamping processing unit 62 of the control device 60 controls the mold clamping process. The mold clamping 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 through the rod 39, and a mold clamping force is generated between the movable platen 12 and the fixed platen 11.

The mold clamping force is detected by the mold clamping force sensor 55. The detected mold clamping force is sent 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 mold clamping force to the 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 mold 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 mold clamping force changes.

Then, the injection molding machine includes a mold thickness adjusting portion 70 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 adjustment unit 70 includes a mold thickness adjustment 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 is screwed to 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 the current sensor detects the current value of the current supplied to the driving coil of the mold thickness adjusting motor 71.

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, and the position of the rod 39 with respect to the suction plate 22 is adjusted. Therefore, the interval between the movable platen 12 and the suction plate 22 can be adjusted, and the gap δ at the end of the mold closing can be set to an optimum value.

The mold thickness adjusting motor 71 may be a servo motor or may include an encoder portion 71b for detecting the amount of rotation of the output shaft 71a of the mold thickness adjusting motor 71. The current supplied to the mold thickness adjusting motor 71 is feedback-controlled based on the detection result of the encoder unit 71b so that the distance between the movable platen 12 and the suction plate 22 becomes a target value.

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

After the mold thickness is adjusted, the state of the injection molding machine (for example, the state of the mold device 19, the state of the electromagnet 49, and the like) may vary. For example, since the temperature of the mold device 19 at the time of injection molding is maintained at the set temperature by the temperature regulator, it is higher than the temperature of the mold device 19 at the time of replacement. As a result, since the mold device 19 thermally expands, the movable platen 12 retreats, and the suction plate 22 retreats to expand the gap δ at the end of the mold closing.

The gap detecting unit 64 of the control device 60 detects whether or not the gap δ exceeds the predetermined value δ 0 . The gap detecting unit 64 performs detection based on, for example, information from the position sensor 53. The position of the suction plate 22 and the gap δ are determined at the position of the movable member 31 of the linear motor 28 detected by the position sensor 53. Instead of the position sensor 53, a dedicated sensor for measuring the distance between the adsorption plate 22 and the rear platen 13 can be switched on and off depending on whether the distance exceeds a predetermined value.

When the gap detecting unit 64 detects that the gap δ exceeds the predetermined value δ 0 , the mold thickness adjustment processing unit 63 drives the mold thickness adjusting unit 70 to reduce the distance between the movable platen 12 and the suction plate 22 . The amount of reduction interval is determined in advance by a test or the like, and may be determined based on the difference ( δ - δ 0) between the gap δ and the predetermined value δ 0 . The amount of reduction interval is determined so that the gap δ at the end of the closed mold does not become 0 (zero). The operation of reducing the interval can be performed during injection molding or after injection molding. The gap δ can be narrowed by narrowing the interval. Therefore, the current supplied to the coil 48 in order to obtain a predetermined mold clamping force can be reduced, and the mold clamping efficiency can be improved.

In order to improve the mold clamping efficiency, the current detecting unit 65 can detect whether or not the current value of the current supplied to the coil 48 in order to obtain a predetermined mold clamping force exceeds a predetermined value. This is because the gap δ at the end of the mold closing is wider, and the current value of the current supplied to the coil 48 in order to obtain a predetermined mold clamping force increases. There is also a case where the gap δ does not change, but the current supplied to the coil 48 increases in order to obtain a predetermined mold clamping force. In such a case, for example, a case where the frictional force between the sliding seat Sb and the guide Gd increases and a case where the electromagnet 49 deteriorates may be mentioned. The current detecting unit 65 is provided in the control device 60, and is detected based on, for example, information from the current sensor 54.

When the current detecting unit 65 detects that the current value of the current supplied to the coil 48 exceeds a predetermined value, the mold thickness adjustment processing unit 63 drives the mold thickness adjusting unit 70 to reduce the interval between the movable platen 12 and the suction plate 22. The amount of reduction interval is determined in advance by a test or the like, and may be determined based on the difference ( δ - δ0) between the gap δ and the predetermined value δ 0 . The amount of reduction interval is determined so that the gap δ at the end of the mold closing does not become 0 (zero). The operation of reducing the interval can be performed during injection molding or after injection molding. The gap δ can be narrowed by narrowing the interval. Therefore, the current supplied to the coil 48 in order to obtain a predetermined mold clamping force can be reduced, and the mold clamping efficiency can be improved.

Further, in order to improve the mold clamping efficiency, the temperature detecting unit 66 can detect whether or not the temperature of the electromagnet 49 exceeds a predetermined temperature during mold clamping. This is because if the current supplied to the coil 48 is increased, the temperature of the electromagnet 49 becomes high. The temperature detecting unit 66 is provided in the control device 60, and is detected based on, for example, information from a temperature sensor 57 that detects the temperature of the electromagnet 49 or its vicinity (for example, the rear platen 13).

When the temperature detecting unit 66 detects that the temperature of the electromagnet 49 exceeds a predetermined temperature, the mold thickness adjustment processing unit 63 drives the mold thickness adjusting unit 70 to reduce the interval between the movable platen 12 and the suction plate 22. The amount of reduction interval is determined in advance by a test or the like, and may be determined based on the difference ( δ - δ0) between the gap δ and the predetermined value δ 0 . The amount of reduction interval is determined so that the gap δ at the end of the mold closing does not become 0 (zero). The operation of reducing the interval can be performed during injection molding or after injection molding. The gap δ can be narrowed by narrowing the interval. Therefore, the current supplied to the coil 48 of the electromagnet 49 in order to obtain a predetermined mold clamping force can be reduced, and the mold clamping efficiency can be improved.

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 mold thickness adjustment processing unit 63 of the above-described embodiment drives the mold thickness adjustment unit based on (1) the detection result of the gap detection unit 64, (2) the detection result of the current detection unit 65, and (3) the detection result of the temperature detection unit 66. 70. However, the mold thickness adjusting portion 70 may be driven based on any of the above detection results (1) to (3).

10‧‧‧Molding device

11‧‧‧Fixed platen (1st fixing member)

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

13‧‧‧ Rear platen (2nd fixing member)

15‧‧ ‧ fixed mode

16‧‧‧moving

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

39‧‧‧ pole

48‧‧‧ coil

49‧‧‧Electromagnet

53‧‧‧ position sensor

54‧‧‧Electromagnetic current sensor

55‧‧‧Molding force sensor

56‧‧• Current sensor for mold thickness adjustment device

57‧‧‧ Temperature sensor for electromagnet

60‧‧‧Control device

61‧‧‧Mold opening and closing processing department

62‧‧‧Molding Processing Department

63‧‧‧Mold thickness adjustment processing department

64‧‧‧Gap detection department

65‧‧‧ Current Detection Department

66‧‧‧ Temperature Detection Department

70‧‧‧Mold thickness adjustment department

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

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.

10‧‧‧Molding device

11‧‧‧Fixed platen (1st fixing member)

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

13‧‧‧ Rear platen (2nd fixing member)

13a‧‧‧foot

14‧‧‧ tied

15‧‧ ‧ fixed mode

16‧‧‧moving

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‧‧‧Molding force sensor

56‧‧• Current sensor for mold thickness adjustment device

57‧‧‧ Temperature sensor for electromagnet

60‧‧‧Control device

61‧‧‧Mold opening and closing processing department

62‧‧‧Molding Processing Department

63‧‧‧Mold thickness adjustment processing department

64‧‧‧Gap detection department

65‧‧‧ Current Detection Department

66‧‧‧ Temperature Detection Department

70‧‧‧Mold thickness adjustment department

71‧‧‧Mould thickness adjustment motor

71a‧‧‧ Output shaft

71b‧‧‧Encoder Department

72‧‧‧ Gears

73, n1‧‧‧ nuts

Ba‧‧‧ position adjustment seat

Bb‧‧‧ movable seat

Fr‧‧ frame

Gd‧‧‧Guide

Sb‧‧‧ sliding seat

δ ‧‧‧ gap

Claims (3)

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 to move together with the first movable member; and a second fixed member; Arranging between the first movable member and the second movable member; the electromagnet is formed on one of the second movable member and the second fixed member, and adsorbs the other to generate a predetermined clamping force; a portion for detecting whether a gap formed between the second movable member and the second fixing member exceeds a predetermined value at the end of closing the mold, and a mold thickness adjusting portion adjusting an interval between the first movable member and the second movable member; The thickness adjustment processing unit controls the mold thickness adjustment unit; and when the gap detection unit detects that the gap exceeds a predetermined value, the mold thickness adjustment processing unit drives the mold thickness adjustment unit to reduce the interval; and the gap detection unit The detection is performed from the end of the closing of the mold to the start of the mold clamping. 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 to move together with the first movable member; and a second fixed member; Arranged in the first movable member and the second An electromagnet is formed on one of the second movable member and the second fixed member, and the other is adsorbed to generate a predetermined clamping force; and the current detecting unit detects the supply to the electromagnet during mold clamping. Whether the current value of the coil exceeds a predetermined value; 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 adjusting portion; and the current detecting portion When it is detected that the current value exceeds a predetermined value, the mold thickness adjustment processing unit drives the mold thickness adjustment unit to reduce the interval. 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 to move together with the first movable member; and a second fixed member; Arranging between the first movable member and the second movable member; the electromagnet is formed on one of the second movable member and the second fixed member, and adsorbs the other to generate a predetermined clamping force; temperature detection a portion for detecting whether the temperature of the electromagnet exceeds a predetermined temperature during mold clamping, a mold thickness adjusting portion for adjusting a distance between the first movable member and the second movable member, and a mold thickness adjusting processing portion for controlling the mold thickness adjusting portion; When the temperature detecting unit detects that the temperature exceeds a predetermined temperature, the mold thickness adjustment processing unit drives the mold thickness adjusting unit to reduce the interval.