KR20130012938A - Injection molding machine - Google Patents

Abstract

PURPOSE: An injection molding device is provided to efficiently cool a coil simultaneously with maintaining a required die clamping force. CONSTITUTION: An injection molding device comprises a first fixed member, a second fixed member, a first movable member, and a second movable member. A fixed mold is mounted in the first fixed member. The second fixed member is arranged to be faced to the first fixed member. A movable mold(16) is mounted in the first movable member. The second movable member is connected to the first movable member, thereby moving with the first movable member. A die clamping force generating device is composed of the second fixed member and the second movable member. A fluid introducing member(80) introducing cooling fluid is installed between the second fixed member and the second movable member. [Reference numerals] (63) Air introducing and processing member

Description

Injection molding machine

The present invention relates to an injection molding machine having an electromagnet for driving a clamping operation.

Conventionally, in an injection molding machine, a molded article is obtained by injecting resin from an injection nozzle of an injection apparatus, filling a cavity space between a stationary mold and a movable mold, and solidifying it. And a mold clamping device is arrange | positioned for moving a mold with respect to a fixed mold, and performing mold closing, mold clamping, and mold opening.

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

By the way, in the electric clamping apparatus of such a structure, since a toggle mechanism is used, it is difficult to change a clamping force by the characteristic of the toggle mechanism, and it is difficult to control a clamping force during shaping | molding because of poor responsiveness and stability. . Accordingly, there is provided a clamping device in which the thrust generated by the ball screw can be used directly as the clamping force. In this case, the torque and the clamping force of the electric motor are proportional, so that the clamping force can be controlled during molding.

However, in the conventional clamping apparatus, the ball screw has a low load resistance, so that a large clamping force cannot be generated, and the clamping force fluctuates due to the torque ripple generated in the motor. In addition, in order to generate the clamping force, it is necessary to constantly supply electric current to the motor, which increases the power consumption amount and heat generation amount of the motor. Therefore, it is necessary to increase the rated output of the motor by that much, which increases the cost of the clamping device.

Therefore, a mold clamping device using a linear motor is used for the mold opening and closing operation, and the suction force of the electromagnet is considered for the mold clamping operation (for example, Patent Document 1).

International Publication No. 05/090052 Pamphlet

However, when using the mold clamping apparatus using the electromagnet adsorption force of patent document 1, there exists a problem that a coil may become high temperature by driving an electromagnet, and burnout of a coil may occur.

Therefore, an object of the present invention is to provide an injection molding machine capable of efficiently cooling a coil while maintaining a required clamping force.

In order to achieve the above object, according to one aspect of the present invention,

A first fixing member equipped with a fixing mold,

A second fixing member disposed to face the first fixing member;

A first movable member to which the movable mold is mounted;

A second movable member connected to the first movable member to move together with the first movable member

And,

Comprising a clamping force generating mechanism for generating a clamping force to the second fixing member and the second movable member,

An injection molding machine is provided, comprising fluid introduction means for introducing a cooling fluid between the second fixing member and the second movable member constituting the clamping force generating mechanism.

According to the present invention, an injection molding machine capable of efficiently cooling a coil while maintaining a required clamping force is obtained.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the state at the time of mold closing of the clamping apparatus in the injection molding machine of embodiment of this invention.
Fig. 2 is a diagram showing a state of starting mold opening of the mold clamping apparatus in the injection molding machine according to the embodiment of the present invention.
FIG. 3 is a diagram schematically showing an example of the air introduction device 80, FIG. 3 (A) shows a state at the start of mold mold opening, and FIG. 3 (B) shows a state at mold closing. to be.
FIG. 4 is a flowchart showing an example of main processing executed by the air introduction processing unit 63 of the control unit 60 of the present embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. In the present embodiment, however, the moving direction of the movable platen at the time of mold closing is referred to as the front side, and the moving direction of the movable platen at the time of mold opening is referred to as the rearward side for the mold clamping device. The moving direction of the screw at the time of injection is called front, and the moving direction of the screw at the time of weighing is described as back.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the state at the time of mold closing of the clamping apparatus in the injection molding machine of embodiment of this invention, and FIG. 2 is the figure which shows the state of the mold starting state of the mold clamping apparatus in the injection molding machine of embodiment of this invention. . In addition, in FIG. 1 and FIG. 2, the member which hatched is shown the main cross section. In addition, in FIG. 1 and FIG. 2, illustration is abbreviate | omitted about the air introduction apparatus 80 mentioned later for the purpose of preventing complexity.

In the drawing, reference numeral 10 denotes a mold clamping device, Fr denotes a frame (mount frame) of the injection molding machine, Gd denotes a guide that is movable relative to the frame Fr, and 11 denotes a guide (not shown) or It is a stationary platen mounted on the frame Fr, spaced apart from the stationary platen 11 at a predetermined interval, and is opposed to the stationary platen 11 to the rear platen 13. ), Four tie bars 14 (in the drawing, only two of the four tie bars 14 are shown) between the fixed platen 11 and the rear platen 13 are hypothesized. do. However, the rear platen 13 is fixed to the frame Fr.

Then, the movable platen 12 is disposed so as to be able to move forward and backward in the mold opening / closing direction while facing the stationary platen 11 along the tie bar 14. For this purpose, the movable platen 12 is fixed to the guide Gd, and a guide, not shown, for penetrating the tie bar 14 into a position corresponding to the tie bar 14 in the movable platen 12. A hole is formed. However, the suction plate 22 described later is also fixed to the guide Gd.

In addition, the fixed mold 15 is fixed to the stationary platen 11, and the movable mold 16 is fixed to the movable platen 12, and the movable mold 16 and the movable mold 16 are fixed as the movable platen 12 moves forward and backward. The mold 16 is contacted and separated, and mold closing, mold clamping, and mold opening are performed. However, as the mold is carried out, a cavity space (not shown) is formed between the stationary mold 15 and the movable mold 16, and an unshown resin injected from the injection nozzle 18 of the injection apparatus 17 is formed. It is filled in the cavity space. Moreover, the mold apparatus 19 is comprised by the stationary mold 15 and the movable mold 16. As shown in FIG.

The suction plate 22 is fixed to the guide Gd in parallel with the movable platen 12. As a result, the suction plate 22 can move forward and backward from the rear platen 13. The suction plate 22 may be formed of a magnetic material. For example, the adsorption plate 22 may be comprised by the electromagnetic laminated steel sheet formed by laminating | stacking the thin plate which consists of ferromagnetic bodies.

The linear motor 28 is attached to the guide Gd to advance and retract the movable platen 12. The linear motor 28 includes a stator 29 and a mover 31, and the stator 29 is parallel to the guide Gd on the frame Fr and further includes a movable platen ( It is formed corresponding to the movement range of 12), and the movable element 31 is formed in the lower end of the movable platen 12 so as to oppose the stator 29, and over the predetermined range.

The mover 31 includes a core 34 and a coil 35. The core 34 protrudes toward the stator 29 and includes a plurality of magnetic pole teeth 33 formed at a predetermined pitch, and the coils 35 have respective magnetic pole teeth 33. Wound on However, the magnetic pole values 33 are formed parallel to each other in a direction perpendicular to the moving direction of the movable platen 12. The stator 29 also has a core, not shown, and a permanent magnet, not shown, formed to extend on the core. The permanent magnet is formed by alternately magnetizing the magnetic poles of the N pole and the S pole at the same pitch as the magnetic pole value 33. When the linear motor 28 is driven by supplying a predetermined current to the coil 35, the mover 31 is retracted, whereby the movable platen 12 is retracted by the guide Gd, and mold closing and mold opening are performed. Can be done.

In addition, in this embodiment, although the permanent magnet is arrange | positioned to the stator 29 and the coil 35 is arrange | positioned to the mover 31, a coil can be arrange | positioned to a stator and a permanent magnet can also be arrange | positioned to a mover. In this case, since the coil does not move as the linear motor 28 is driven, wiring for supplying power to the coil can be easily performed.

However, the mover 31 of the linear motor 28 to the movable platen 12 or the adsorption plate 22 is not limited to the configuration in which the movable platen 12 and the suction plate 22 are fixed to the guide Gd. It may be configured to install. The mold opening / closing mechanism is not limited to the linear motor 28 but may be hydraulic or electric.

When the movable platen 12 is advanced and the movable mold 16 contacts the stationary mold 15, mold closing is performed, and then mold molding is performed. Then, in order to perform the mold, the electromagnet unit 37 is disposed between the rear platen 13 and the suction plate 22. And the center rod 39 (rod) which extends through the rear platen 13 and the adsorption plate 22, and connects the movable platen 12 and the adsorption plate 22 is arrange | positioned so that a retreat is possible. The center rod 39 advances and retracts the suction plate 22 in conjunction with the advance and retreat of the movable platen 12 at mold closing and mold opening. Transfer to platen 12.

However, the mold clamping device 11, the movable platen 12, the rear platen 13, the suction plate 22, the linear motor 28, the electromagnet unit 37, the center rod 39, etc. 10) is configured.

The electromagnet unit 37 is composed of an electromagnet 49 formed on the rear platen 13 side and an adsorption portion 51 formed on the adsorption plate 22 side. In addition, in the predetermined part of the rear end surface of the rear platen 13, in this embodiment, the groove 45 is formed around the center rod 39, and the core (inner electrode) (inside the groove 45) ( 46 and a yoke (outer electrode) 47 is formed outside the groove 45. The coil 48 is wound around the core 46 in the groove 45. In addition, the core 46 and the yoke 47 may be comprised by the integral structure of a casting, or may be comprised by the electronic laminated steel sheet formed by laminating | stacking the thin plate which consists of ferromagnetic bodies.

In the present embodiment, however, the electromagnet 49 may be formed separately from the rear platen 13, and the adsorption portion 51 may be formed separately from the adsorption plate 22, and as a part of the rear platen 13. The electromagnet may form an adsorption part as part of the adsorption plate 22. In addition, arrangement | positioning of an electromagnet and an adsorption part may be reversed. For example, the electromagnet 49 may be provided on the suction plate 22 side, and the suction unit may be provided on the rear platen 13 side.

In the electromagnet unit 37, when a current is supplied to the coil 48, the electromagnet 49 is driven to adsorb the adsorption unit 51, thereby generating a clamp force.

The center rod 39 is arranged to be connected to the suction plate 22 at the rear end and to the movable platen 12 at the front end. Therefore, the center rod 39 is advanced together with the movable platen 12 at the time of mold closing to advance the adsorption plate 22, and is retracted together with the movable platen 12 at the time of mold opening to retreat the adsorption plate 22. . For this purpose, the hole 41 for penetrating the center rod 39 is formed in the center part of the rear platen 13, and in the opening of the front end part of the hole 41, the center rod 39 can be slid. A bearing member Br1, such as a bush, for supporting it is arranged.

The drive of the linear motor 28 and the electromagnet 49 of the mold clamping device 10 is controlled by the control unit 60. The control unit 60 includes a CPU, a memory, and the like, and a circuit diagram for supplying current to the coil 35 of the linear motor 28 or the coil 48 of the electromagnet 49 in accordance with the result calculated by the CPU. Equipped. The load detector 55 is further connected to the control unit 60. The load detector 55 is located at a predetermined position (the predetermined position between the fixed platen 11 and the rear platen 13) of the at least one tie bar 14 in the clamping apparatus 10. It is provided and detects the load applied to the tie bar 14. In the figure, the example in which the load detector 55 was provided in the upper and lower tie bars 14 is shown. The load detector 55 is comprised by the sensor which detects the elongation amount of the tie bar 14, for example. The load detected by the load detector 55 is sent to the control part 60. In addition, the control part 60 is abbreviate | omitted for convenience in FIG.

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

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

Next, the mold clamping unit 62 of the controller 60 controls the mold clamping process. The mold processing part 62 supplies a current to the coil 48, and adsorb | sucks the adsorption | suction part 51 by the adsorption force of the electromagnet 49. FIG. As a result, the clamping force is transmitted to the movable platen 12 via the suction plate 22 and the center rod 39, and the mold is carried out. When the clamping force is changed, such as at the start of clamping, the clamping processing unit 62 is a normal clamping force necessary for generating a target clamping force that is to be obtained by the change, that is, a target clamping force in a steady state. The value of the current is controlled to be supplied to the coil 48.

However, the clamp force is detected by the load detector 55. The detected clamping force is sent to the control part 60, and the control part 60 adjusts the electric current supplied to the coil 48 so that a clamping force may be set value, and feedback control is performed. In the meantime, the molten resin in the injection apparatus 17 is injected from the injection nozzle 18, and is filled in the cavity space of the metal mold | die apparatus 19. As shown in FIG.

When the resin in the cavity space is cooled and solidified, the mold opening and closing processing unit 61 controls the mold opening process. In the state of FIG. 1, the mold processing unit 62 stops the supply of current to the coil 48. As a result, the linear motor 28 is driven, the movable platen 12 is retracted, and as shown in Fig. 2, the movable mold 16 is placed at the retreat limit position, and mold opening is performed.

Here, with reference to FIG. 3 and following, the characteristic structure of this invention is demonstrated.

FIG. 3 is a diagram schematically showing an example of the air introduction device 80, FIG. 3 (A) shows a state at the start of the mold clamping device, and FIG. 3 (B) shows a state at the time of mold closing. to be. 3, the rear platen 13 and the adsorption plate 22 are schematically shown in order to prevent the complexity of the figure, and the illustration of another structure is abbreviate | omitted.

The air introduction device 80 is a device that introduces cooling air into the space (gap) between the rear platen 13 and the suction plate 22 in the mold clamping direction. The air introduction device 80 may have any configuration as long as it has a function of introducing cooling air between the rear platen 13 and the suction plate 22. In the example shown in FIG. 3, the air introduction device 80 includes a nozzle (discharge port) 82, a pipe line (duct) 84, and an end portion of a space between the rear platen 13 and the suction plate 22. A compressor (or pump) 86 and a valve 88 are included.

The nozzle 82 may be supported by a fixing member (for example, the frame Fr, the rear platen 13, or the like). In this case, the nozzle 82 is fixedly supported at the position which can discharge cooling air on the surface by the side of the adsorption plate 22 in the rear platen 13, as shown schematically in FIG. Alternatively, the nozzle 82 may be supported by the movable member (for example, the guide Gd). For example, when supported by the guide Gd, the nozzle 82 is fixedly fixed to the guide Gd at a position capable of discharging cooling air on the surface of the rear platen 13 side of the suction plate 22. It may be supported. In this case, the pipe line 84 may have a site | part (for example, a bellows site | part) which can be extended so that the movement of the nozzle 82 according to the movement of the guide Gd may be absorbed.

Plural nozzles 82 may be provided. For example, a plurality of nozzles 82 may be arranged along one side of the rear platen 13 at equal intervals. The discharge direction of the cooling air by the nozzle 82 is arbitrary. For example, in the example shown in FIG. 3, although the nozzle 82 is installed so as to discharge cooling air from the bottom to the upper side, the nozzle which discharges cooling air from an upward direction to a downward direction, a lateral direction, or an inclination direction is provided. You may be. In addition, the nozzle 82 may be provided in the aspect which discharges cooling air from a some direction. However, in the case where a plurality of nozzles 82 are provided, the pipe line 84 may have a manifold portion branched to the plurality of nozzles 82.

The compressor 86 may be of any type including a piston type or a vane type, compresses air, and supplies the compressed air to the conduit 84. The valve 88 is provided between the compressor 86 and the nozzle 82. The valve 88 may be a mechanical valve or an electromagnetic valve. The compressor 86 and the valve 88 are connected to the control unit 60, and these operations are controlled by the control unit 60. However, another element, such as an accumulator, may be provided in the conduit 84 between the compressor 86 and the nozzle 82.

As shown in FIG. 3 (B), the air introduction device 80 preferably performs a mold clamping process when the gap δ between the rear platen 13 and the suction plate 22 is minimized. In the case where a startable state is formed or the mold clamping process is being executed, the air is operated to introduce cooling air between the rear platen 13 and the suction plate 22. In this case, the cooling air introduced between the rear platen 13 and the adsorption plate 22, as shown by the arrow in FIG. 3B, shows the flow of the cooling air. It passes through and flows along the surface on the rear platen 13. At this time, by directly contacting the cooling air to the coil 48, the coil 48 is efficiently cooled. In addition, air between the rear platen 13 and the suction plate 22 (air whose heat is moved from the coil 48) is discharged to the outside by newly introduced cooling air, so that the heat of the coil 48 is external. Is released. However, since the cooling air flows faster when passing through the narrow gap δ between the rear platen 13 and the suction plate 22, the heat transfer efficiency is improved, thereby improving the cooling efficiency. In this manner, according to the present embodiment, cooling of the coil 48 can be effectively realized, and burnout of the coil 48 can be prevented.

4 is a flowchart showing an example of main processing executed by the air introduction processing unit 63 of the control unit 60 of the present embodiment. In addition, the control part 60 may be implement | achieved by a microcomputer, and the function of the following air introduction processing part 63 may be implemented by executing a control program memorize | stored in a predetermined memory by a CPU. The processing routine shown in FIG. 4 may be repeatedly executed at predetermined intervals during the operation of the injection molding machine.

In step 400, it is determined whether a predetermined cooling start condition is satisfied. Predetermined cooling start conditions vary. For example, the predetermined cooling start condition may be a condition that is always satisfied during the operation of the injection molding machine. In addition, the predetermined cooling start condition may be satisfied periodically every predetermined time. Alternatively, the predetermined cooling start condition may be satisfied when a predetermined instruction from a user is input.

Alternatively, the predetermined cooling start condition may be satisfied when the start timing of the mold clamping process (or the timing before the mold clamping process start time) is detected. In addition, from the same viewpoint, the predetermined cooling start condition may be satisfied when the energization to the coil 48 is detected. In addition, from the same viewpoint, the predetermined cooling start condition may be satisfied when the gap δ between the rear platen 13 and the suction plate 22 becomes less than or equal to a predetermined value. In such a case, introduction of the cooling air can be started in synchronization with the timing at which the distance between the rear platen 13 and the suction plate 22 becomes less than or equal to a predetermined value.

Alternatively, the predetermined cooling start condition may be satisfied when the temperature of the electromagnet unit 37, for example, the temperature of the coil 48, is higher than or equal to the predetermined temperature T1. In this case, the temperature of the coil 48 may be detected using a thermistor or the like. The predetermined temperature T1 may be set to a temperature at which a predetermined margin is provided with respect to the upper limit value at which loss of the coil 48 occurs. In this case, the introduction of the cooling air can be started in synchronization with the timing at which the temperature of the coil 48 becomes high.

If the predetermined cooling start condition is satisfied in this step 400, the process proceeds to step 402. However, the predetermined cooling start condition may be provided in plural (for example, the above-described various conditions), when any one is satisfied, and may proceed to step 402, or when any two or more combinations are satisfied ( For example, when the gap δ between the rear platen 13 and the suction plate 22 becomes less than the predetermined value, and the temperature of the coil 48 becomes equal to or greater than the predetermined temperature T1, the step 402 is performed. It may be made to proceed.

In step 402, the valve 88 is opened. Thereby, the cooling air compressed from the compressor 86 is discharged from the nozzle 82, is introduced between the rear platen 13 and the suction plate 22, and the cooling described above is realized. In addition, the compressor 86 may be always operating depending on predetermined cooling start conditions, and may operate before the opening operation | movement of the valve 88. FIG.

In step 404, it is determined whether a predetermined cooling end condition is satisfied. However, if the predetermined cooling start condition in step 400 is a condition that is always satisfied during the operation of the injection molding machine, the predetermined cooling end condition may not be determined. In this case, the process of step 402 may be continued until the injection molding machine is stopped (valve 88 may be kept open).

The predetermined cooling termination conditions are various. For example, it may be satisfied when a predetermined time elapses after the valve 88 is opened. That is, the predetermined cooling end condition may be set based on the cooling time. Alternatively, the predetermined cooling end condition may be satisfied when a predetermined instruction from a user is input.

Alternatively, the predetermined cooling end condition may be satisfied when the end timing of the mold clamping process (or the start timing of the subsequent mold opening process) is detected. In addition, from the same viewpoint, the predetermined cooling termination condition may be satisfied when the energization to the coil 48 is completed. In addition, from the same point of view, the predetermined cooling termination condition may be satisfied when the gap δ between the rear platen 13 and the suction plate 22 becomes more than a predetermined value or starts to increase from the minimum value. In this case, the introduction of the cooling air can be stopped in synchronization with the timing at which the gap δ between the rear platen 13 and the suction plate 22 starts to increase.

Alternatively, the predetermined cooling termination condition may be satisfied when the temperature of the coil 48 is lower than the predetermined temperature T2. In this case, the introduction of the cooling air can be stopped in synchronization with the timing at which the temperature of the coil 48 becomes a safe low temperature.

However, these predetermined cooling termination conditions may be combined with appropriate cooling starting conditions among the various cooling starting conditions described in connection with step 400 above. For example, when the cooling start condition is a condition that is satisfied when the temperature of the coil 48 reaches or exceeds the predetermined temperature T1, the predetermined cooling termination condition indicates that the temperature of the coil 48 is lower than the predetermined temperature T2. If this is the case, the condition may be satisfied. In this case, the predetermined temperature T2 may also be the same as the predetermined temperature T1 associated with the predetermined cooling start condition in step 400, but a value smaller than the predetermined temperature T1 in order to prevent hunting. It may be.

In step 404, when the predetermined cooling end condition is satisfied, the process proceeds to step 406. When the predetermined cooling end condition is not satisfied, the process returns to step 402 and the valve 88 is held in the open position. do. However, a predetermined cooling termination condition may be provided in plural (for example, various conditions described above), when any one is satisfied, may proceed to step 406, or when any two or more combinations are satisfied ( For example, when the gap δ between the rear platen 13 and the suction plate 22 becomes equal to or more than the predetermined value and the temperature of the coil 48 becomes less than the predetermined temperature T2), step 406 It may proceed as follows.

In step 406, the valve 88 is closed. As a result, the discharge is stopped from the nozzle 82 of the cooling air. However, by this, the compressor 86 may be stopped.

As described above, according to the processing shown in FIG. 4, by appropriately setting the cooling start condition and the cooling end condition, the cooling timing of the coil 48 can be optimized according to the resistance of the coil 48, the cooling capacity, the use situation, and the like. . For example, when the gap δ between the rear platen 13 and the suction plate 22 is small (when the cooling efficiency is good), cooling air is introduced, and the space between the rear platen 13 and the suction plate 22 is introduced. Cooling can be efficiently achieved by stopping the introduction of cooling air when the gap δ is large. For example, cooling air is efficiently introduced when the temperature of the coil 48 is high (when the necessity of cooling is high) and the introduction of cooling air is stopped when the temperature of the coil 48 is low. Can be.

However, in the above-described embodiment, the "first fixing member" in the claims corresponds to the fixing platen 11, and the "first movable member" in the claims is the movable plate. Corresponds to the tongue 12. In addition, the "second fixing member" in the claims corresponds to the rear platen 13 and the "second movable member" in the claims corresponds to the suction plate 22. However, as a modification, the electromagnet 49 may be provided on the suction plate 22 side, and the suction part may be provided on the rear platen 13 side. In this modification, the "second fixing member" is the suction plate 22. ), And the "second movable member" in the claims corresponds to the rear platen 13. In addition, in the above-described embodiment, the "fluid introduction means" in the claims corresponds to the air introduction device 80.

As mentioned above, although preferred embodiment of this invention was described in detail, this invention is not limited to the above-mentioned embodiment, A various deformation | transformation and substitution are given to the above-mentioned embodiment, without deviating from the range of this invention. Can be added.

For example, in the above-mentioned embodiment, although air is used as a fluid for cooling, fluids other than air (for example, water, oil, another gas, etc.) may be used.

In addition, although the cooling air is introduce | transduced between the rear platen 13 and the adsorption plate 22 by positive pressure in the Example of the above-mentioned, the cooling air is supplied to negative pressure between the rear platen 13 and the adsorption plate 22. It may be introduced by. For example, a negative pressure source having a suction port is provided between the rear platen 13 and the suction plate 22, and a negative pressure is generated between the rear platen 13 and the suction plate 22 to generate a negative pressure source. Peripheral air may be introduced between (22).

In the embodiment described above, the flow rate of the cooling air at the time of introducing the cooling air between the rear platen 13 and the suction plate 22 may be constant or may be variably controlled. For example, the flow rate of the cooling air may be variably controlled by the sun which increases as the temperature of the coil 48 increases. Alternatively, the flow rate of the cooling air may be variably controlled in an aspect in which the gap δ between the rear platen 13 and the suction plate 22 increases. However, the flow rate of the cooling air may be realized by varying the opening degree or opening time interval (frequency) of the valve 88.

In addition, in the above-mentioned embodiment, although the electromagnet 49 of one pole is formed in the rear platen 13, even if an electromagnet is provided in the rear platen 13 so that a some pole may be formed. (I.e., multipolarization may be realized).

In addition, although the clamping apparatus 10 of a specific structure is illustrated in the above-mentioned description, as long as it clamps using an electromagnet, the clamping apparatus 10 may be arbitrary structures.

Br1 bearing member
Fr frame
Gd guide
10 clamping device
11 Fixed Platen
12 movable platen
13 rear platen
14 tie bars
15 Fixed mold
16 movable mold
17 Injection device
18 Injection Nozzle
19 Mold Device
22 Suction Plate
28 linear motors
29 stator
31 mover
33 stimulation
34 core
35 coil
37 Electromagnet Unit
39 center rod
41 holes
45 home
46 cores
47 York
48 coils
49 electromagnet
51 adsorption part
55 load detector
60 control unit
61 type opening and closing part
62 Shape Processing Unit
63 Air introduction part
80 Air Inlet
82 nozzle
84 pipelines
86 compressor
88 valve

Claims (5)

A first fixing member to which the fixed mold is mounted;
A second fixing member disposed to face the first fixing member;
A first movable member to which the movable mold is mounted;
A second movable member connected to the first movable member to move together with the first movable member
And,
Comprising a clamping force generating mechanism for generating a clamping force to the second fixing member and the second movable member,
Having fluid introduction means for introducing a fluid for cooling between said second fixing member and said second movable member constituting said clamping force generating mechanism;
Injection molding machine characterized in that. The method according to claim 1,
And said fluid introduction means is operable to introduce said cooling fluid when predetermined conditions are met. The method according to claim 2,
And the fluid introduction means is operable to introduce the cooling fluid when the gap between the first member and the second member reaches a predetermined value or less. The method according to claim 2 or 3,
And the fluid introduction means is operable to introduce the cooling fluid when the temperature of the electromagnet exceeds a predetermined threshold. The method according to any one of claims 1 to 4,
And said fluid introduction means introduces a compressor body for cooling between said second fixing member and said second movable member.

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