JPH06270220A - Mold clamping device for injection molding machine and its control method - Google Patents

Abstract

PURPOSE:To secure the parallel movement of a movable mold by controlling a plurality of mold clamping cylinders of a mold clamping device respectively and individually. CONSTITUTION:A mold clamping device comprises a fixed die plate 12, a movable die plate 22 and a plurality of mold clamping cylinders for moving the movable die plate toward the fixed die plate along tie bars. Measuring devices attached to or disposed in the vicinity of a mold clamping means and measuring the length of respective mold clamping cylinders are provided, and a control device moving the movable mold in parallel by using combinedly the measured value and the movement indication value is also provided. A plurality of measuring devices are disposed for the purpose of forming a plurality of starting points on the plane between the movable die plate and the fixed die plate and also sensing the parallelism of the movable plate by a plurality of starting points.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping device and a control method thereof, and more particularly, to rolling / spreading of a molded product while clamping a compression molding machine, an injection compression molding machine or a press. The present invention relates to a mold clamping device and a control method therefor.

[0002]

2. Description of the Related Art Conventionally, a mold clamping device for rolling and spreading a molded product while clamping the mold, such as a compression molding machine, an injection compression molding machine, or a press, has been proposed, for example, in Japanese Utility Model Publication No. 62-185017. As described above, instead of the leveling cylinder, a plurality of pressurizing cylinders that are controlled in parallel are arranged on the upper part of the platen, and one pressurizing cylinder is used as a master, and the rest is its slave. There is one that maintains the parallelism of the movable plate by molding. In addition, the mold clamping device is disclosed in Japanese Patent Application Laid-Open No.
As proposed in 172711, there are some which employ a friction clamp type using hydraulic pressure.

[0003]

However, in the above-mentioned conventional Japanese Utility Model Laid-Open No. SHO 62-185017, one plate is used as a master and the rest is used as slaves to balance the platen with a plurality of pressurizing cylinders. Even if there is a delay, the master cylinder advances as instructed and the platen tilts and cannot maintain parallelism. Further, when the slave cylinder is at the shortest distance, the slave cylinder moves backward because it follows the master cylinder. Further, in the friction clamp type using hydraulic pressure as in JP-A-2-172711, since the locking position is not constant, the parallelism of the movable mold with respect to the fixed mold cannot be obtained and it is difficult to move in parallel. Is. Further, recently, there has been a great demand for large-sized and highly accurate molded products, but there is no good mold clamping device and method as described above.

Further, since the measuring device arranged in the conventional mold clamping device is fixedly mounted on the fixed die plate and the movable die plate or the supporting plate, it is movable with the solid die plate generated by the reaction force at the time of mold clamping. Due to the fluctuation of the distance between the die plates, the measured distance cannot be accurately grasped, and the rolling and spreading of the molded product cannot be performed accurately. In particular, recently, a large-sized injection compression molding machine is desired, and in the large-sized injection compression molding, it is also demanded that the movable mold moves in parallel with the fixed mold with high accuracy. If the measured value contains an error, the parallel movement cannot be controlled accurately. Also,
When the reaction force is large, there is a problem that the measurement accuracy is remarkably impaired by the larger distortion.

The present invention focuses on the above problems and relates to a mold clamping device and a control method therefor, and in particular, a molding machine such as a compression molding machine, an injection compression molding machine, or a press is used for rolling and The present invention relates to a mold clamping apparatus for performing spreading and a control method thereof, and an object thereof is to control a plurality of mold clamping cylinders independently and control them so as to move in parallel.

[0006]

According to a first aspect of the present invention, there is provided a fixed die plate for holding a fixed die, a movable die plate for holding a movable die, and a penetrating the movable die plate. A tie bar supported by a fixed die plate, a plurality of mold clamping cylinders that move the movable die plate with respect to the fixed die plate to perform mold clamping, and mold clamping cylinders attached to or near the mold clamping means. In the mold clamping device, which comprises a measuring device for measuring the length of the movable die and a control device for controlling the movable die to move in parallel by adjusting the measured value and the movement instruction value, a movable die plate and a fixed die plate are provided. Has a plurality of origins on a plane between them, and a plurality of measuring devices are arranged so that the parallelism of the movable die plate can be detected by the plurality of origins.

In the second invention, a mold having at least a fixed die plate for holding the fixed mold, a movable die plate for holding the movable mold, and a measuring device for measuring the distance of the movable die plate to the fixed die plate. In the tightening device, one end of the measuring device is held in a spherical shape such as a ball joint, and the other end is pivotally and slidably held.

In the third invention, the molding material is housed between the fixed mold and the movable mold, and the plurality of tie bars and the movable plate are locked by the locking device, and then the mold clamping of the plurality of mold clamping cylinders is performed. The force is transmitted to the tie bar and the movable die plate is clamped,
Also, in a mold clamping device that molds a molded product by moving the movable mold in parallel with the fixed mold while detecting the position of the movable plate during mold clamping, the position provided between the movable die plate and the support plate. While aligning the position sensor of the movable die plate with the origin of the sensor, store the origin and output the absolute value of the amount of movement of the movable die plate based on this origin.
Move the movable die plate in parallel with the fixed die plate.

In the fourth invention, which is mainly based on the third invention,
While aligning the position sensors with multiple origins, the parallelism of the movable die plate with respect to the fixed die plate is detected,
Set the movement amount of the mold clamping cylinder according to the parallelism.

In the fifth aspect of the invention, which is mainly the third aspect of the invention, the position sensors are aligned with a plurality of origins, and the parallelism of the movable die plate with respect to the fixed die plate is detected. In the following cases, the same movement amount is output and the translation is performed, and when the parallelism exceeds a predetermined value, the movement amount corrected so as to be the translation is output and the translation is performed.

[0011]

According to the above construction, when a plurality of actuators of the mold clamping means are used for parallel control, for example, even if the locking positions of the tie bar and the movable die plate are deviated as shown in FIG. Later tie bars can be easily moved and moved in parallel. In FIG. 1, the tie bar is fixed at a position (stroke end position) where the left side of the piston of the mold clamping cylinder is in contact with the fixed die plate. In this state, the locking device locks the movable die plate and the diver, but in the present invention, the parallelism of the movable plate can be quickly obtained by the absolute value of the measurement values from a plurality of accurate measuring devices, The absolute value of the amount of movement of the movable die plate can be output when the movable plate moves up after being locked, and the movable die plate can be moved in parallel in the direction of the fixed die plate.

Alternatively, for the initial deviation of parallelism,
After moving while making corrections, the same reduction amount is commanded to each mold clamping cylinder, and when the amount of displacement is less than the specified amount, the difference between the absolute command value of the moving amount of the mold clamping cylinder and the absolute value of each mold clamping cylinder. By grasping, and correcting the tilt, twist, etc., the parallel control can be performed accurately, surely, and swiftly. Further, when the deviation amount is equal to or less than the predetermined amount, the same amount of movement is performed, and when the deviation amount deviates from the reference value, the movement is performed while correcting, and quick parallel movement control is performed.

Further, since one end of the measuring device is held in a spherical shape such as a ball joint and the other end is pivotally and slidably held, the solid die plate is distorted due to the reaction force at the time of mold clamping. Can measure the measuring distance accurately without applying force to the measuring device, and can accurately roll and spread the molded product. In particular,
Even for a recent mold that needs to be opened and closed with high accuracy, the measured value does not include an error, and parallel movement can be controlled with high accuracy. Further, there is no problem that the measuring device is damaged by the distortion.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an external view of a mold clamping device of an injection molding machine for explaining the present invention. FIG. 2 is a schematic side view of an injection compression molding apparatus using a mold clamping device for explaining the present invention, and FIG. 3 is a schematic view of a mold clamping portion for explaining the present invention. It may be vertical. FIG. 4 is a hydraulic circuit of the injection compression molding device, and FIG. 5 is a block diagram of a control device of an example of the present invention. FIG. 6 is a view showing an example of a position sensor support device, FIG. 7 is a partially enlarged view showing an example of the position sensor, and FIG. 8 is a time chart diagram at the time of mold clamping of the injection compression molding apparatus.

In FIG. 1, an injection compression molding apparatus 1 includes a compression molding apparatus 2, an injection apparatus 3, and a control apparatus 4 (shown in FIG. 5).
Consists of. 1 and 2, a compression molding apparatus 2 includes a fixed die plate portion 10 for holding a fixed die, a movable die plate portion 20 for holding a movable die, and a movable die plate that is quickly moved back and forth with respect to the fixed die plate. The mold advancing / retreating device 30 to be operated, and after the movable die plate approaches the fixed die plate and reaches a predetermined position, the movable die plate moves forward with respect to the fixed die plate to clamp and spread the plastic material. A mold clamping device 60 for performing, a sensor for detecting a distance between the movable die plate 22 and the fixed die plate 12, that is, a die plate position sensor 100 for detecting a distance with normal accuracy, and a position for detecting an accurate position. And a sensor 110.

Further, the injection device 3 is provided with an injection cylinder part 90 for injecting a plastic material into the compression molding device 2, and the injection cylinder part 90 is a slide cylinder (not shown) fixed to a heating cylinder 91. It is mounted so that it can slide in the fixed mold 11 direction. A screw 92 is closely inserted into the heating cylinder 91 of the injection cylinder portion 90, and the screw slides in the direction of the mold by driving a hydraulic cylinder (not shown) to inject a plastic material.

In the compression molding apparatus 2, a fixed die plate portion 10 is fixedly installed on one end of the bed 7, and the fixed die plate portion 10 includes a fixed die 11 and a fixed die plate 12 holding the fixed die 11. Consists of. Further, the fixed die plate portion 10 is provided with a mounting portion 30a of the mold advancing / retracting device 30 and a mold clamping device 60. A guide rail 8 is fixedly installed on the bed 7, and a movable die plate portion 20 standing upright on the ground is arranged on the guide rail 8. The movable die plate portion 20 is movable with a movable mold 21. Movable die plate 22 holding die 21 and movable die plate 2
Consisting of a linear guide bearing 23 that holds 2
A linear guide bearing 23 is slidably and pivotally attached to the guide rail 8. Further, the movable die plate portion 20 is provided with a locking device 210, an ejector device 220, and a mounting portion 30b of the mold advancing / retreating device 30.
Further, the other end of the bed 7 is provided with a tie bar 61 described later.
A support plate 9 is fixedly provided for guiding the movable body.

The fixed die plate 12 is provided with a tie bar 61 of a mold clamping device 60 for guiding the movable die plate 22 in a slidable manner and pulling the movable die plate 22 during mold clamping. Furthermore, the fixed die plate 12
A cylinder 91 that heats the plastic material of the injection device 3 that injects the plastic material such as resin into the cavity portion 14 at approximately the center of the cylinder 91.
(Hereinafter, referred to as a heating cylinder 91) is in contact with the fixed mold 11. The position sensors include four position sensors 110a, 110b, 110c and 110d (see FIG. 4) in which the die plate position sensor 100 for detecting a normal distance is located in the vicinity of the die advancing / retreating device 30 and for detecting an accurate position.
Shown in. ) Is disposed between the fixed die plate 12 and the movable die plate 22 in the vicinity of the four tie bars 61. One end is fixed to the fixed die plate 12 and the other end is movable, as will be described later in detail. It is slidably supported by the die plate 22.

In FIG. 1, the mold clamping cylinder 65 of the mold clamping device 60 has a plurality of hydraulic cylinder chambers 62 formed in the fixed die plate 12, and a double rod type hollow hole piston 63 (hereinafter referred to as piston 63). .) Is inserted pivotally, and a piston cover 64 is further inserted. The piston cover 64 is fixed to the fixed die plate 12 to form cylinder chambers 62a and 62b. A tie bar 61 is fixed to the piston 63 with a screw. Four mold clamping cylinders 65 (65a, 65b, 65c,
65d) is provided.

In FIG. 4, each mold clamping cylinder 65 has a
Electrohydraulic servo valves (hereinafter referred to as electromagnetic servo valves 66) 66a, 66b, 66c, 66d are connected in parallel to the pipe 67, and each electromagnetic servo valve is arranged so that the movable mold 21 moves in parallel to the fixed mold 11. 66 independently operates by receiving a command from the control device 4. The electromagnetic servo valve 66 controls meter-in / meter-out. Further, a relief valve 73 is arranged in the cylinder chamber 62b. The pipe 67 is connected to a variable displacement hydraulic pump via a variable flow rate adjusting valve, a check valve, etc., which are not shown. Also,
A pipe 201 is branched from a pipe 67, and a cylinder 223 of an ejector device 220 is arranged in the pipe 201 via an electrohydraulic servo valve 202 for an ejector.
Further, a pipe 211 is branched from the pipe 67, and the locking device 2 is connected to the pipe 211 via a locking electromagnetic switching valve 212.
Ten hydraulic fastening machines 213 are arranged.

As shown in FIG. 3, the hydraulic fastening machine 213 is in a position where the left side 63a of the piston 63 of the mold clamping cylinder 65 is in contact with the fixed die plate 12, and the electromagnetic servo valve 66 is in the neutral position ( The tie bar 61 is locked when the movable plate 22 is stopped or decelerated when the position is in (b). At this time, the distance between the fixed die plate 12 and the movable die plate 2 is 4 in the vicinity of the tie bar 6.
Highly accurate position sensors 110a, 110b, 110
c, 110d.

As shown in FIG. 5, the control device 4 includes, for example, one main computer 5 and four microcomputers 6
a, 6b, 6c, 6d (in the case of four mold clamping cylinders), each microcomputer 4 includes each mold clamping cylinder 65a, 65a.
b, 65c, 65d, each position sensor 110 arranged to control the length of each mold clamping cylinder.
a, 110b, 110c, 110d, and electromagnetic servo valves 66a, 66b, 66c, 66d for switching the pressure oil for driving the mold clamping device 60 according to a command from the microcomputer,
It is connected to the. In addition, the main computer 5
A position sensor 100 that is connected to each microcomputer 4 and that detects the distance between the movable die plate 22 and the fixed die plate 12 when the mold is separated from a predetermined position.
And a pressure sensor 101 for determining whether or not the locking device is activated and locked. further,
The main computer 5 includes an electromagnetic switching valve 30a for switching pressure oil for driving the advancing / retreating device 30, and a locking device 4.
Solenoid switching valve 40a for switching pressure oil for driving 0
And the die stroke setting means 120 for inputting the operating position and speed of the advancing / retreating device 30, the mold clamping device 60, or the injection timing of the plastic material according to the moving distance of the movable mold 21.
And an injection amount setting means 130 for setting the injection amount of the plastic.
, And are controlled by a predetermined command.

As shown in FIGS. 6 and 7, one of the four position sensors 110a, 110b, 110c and 110d is attached to the fixed die plate 12 via the spherical surface of the ball joint 111 and the other end. The portion is slidably and pivotally supported by a guide 112 fixed to the support plate 9.
Position sensors 110a, 110b, 110c, 110d
Each of them is composed of a pulse counting type sensor of the moire fringe type, and the ball joint 111 of the fixed die plate 12.
Between the main plate 1 and the guide 112 of the support plate 9
The index scale 114, which is attached to the movable die plate 22, is attached to the movable die plate 22, and the index scale 114, which is supported by a bearing (not shown) along the main scale 113 and slides smoothly. Further, the position sensors 110a, 110b, 1
In each of 10c and 110d, there is an absolute origin (O) of the scale approximately at the center of the main scale 113 between the ball joint 111 of the fixed die plate 12 and the guide 112 of the support plate 9. 1
The plane of the origin (O) of each of the scales 10b, 110c, and 110d is set so that the movable die plate 22 is parallel to the fixed die plate 12. Therefore, if the movable die plate 22 slides along the four tie bars 61 and the origin (O) of each scale is zero at that time, the movable die plate 22 is parallel to the fixed die plate 12. It is confirmed to be in.

The origin (O) of this scale is such that when the precisely prepared reference die is attached to the fixed die plate 12 and the movable die plate 22, the movable die plate 22 is attached to the fixed die plate 12. Is the origin (O) of the position of the absolute value of the mold clamping device 60 when they are parallel to each other, and the position control of the present invention is based on the origin (O) of the position of the absolute value of the movable die plate 22. Measure the position,
Control. In other words, even if the dies are exchanged and there is an error in the parallelism of the dies, the reference origin of the parallelism of the movable die plate 22 with respect to the fixed die plate 12 is not adjusted, and the parallelism of the mold clamping device 60 is adjusted. It is the origin (O) of the absolute value position.
The origin of this position does not need to be zero or the same numerical value, and the precisely prepared reference mold is fixed die plate 12
The value when attached to the movable die plate 22 may be the origin (O) of the absolute value position. This numerical value may be used as the origin (O) of the position and recognized and stored in the main computer 5.

Next, the operation of the injection compression molding method for plastics will be described. First, a power source (not shown) is turned on, and each of the four position sensors 110a, 110b, 110c, 1
The origin of the scale of 10d (shown in Fig. 4. O1, O2, O
3 、 O4) and confirm the reference position of the scale to the controller 4
Make them recognize and memorize. This is boost cylinder 3
1 is switched to manual and slowly operated to move the movable die plate 22 along the tie bar 61 to the fixed die plate 12
The index scales 114 attached to the movable die plate 22 that slides smoothly along the main scales 113 in the respective directions.
The origin (O) of the scale at approximately the center of the scale is passed through, and the control device 4 recognizes and stores the reference positions (O) of the four scales.

Next, at the time of mounting or replacing the mold, the position of the mold depending on the thickness of the mold, that is, the touch surface (contact) between the fixed mold 11 and the movable mold 21 in order to perform a program operation for opening and closing the mold. (Surface) is recognized by the control device 4 and stored.
Also in this case, similarly to the confirmation of the origin position, the boost cylinder 31 is manually switched to be slowly operated, the movable die plate 22 is moved along the tie bar 61 toward the fixed die plate 12, and 10 mm to 40 m from the fully closed position.
The movable die plate starts to close at a slow speed by stopping at the position m and continuing to press the die touch switch (not shown), and when it reaches the fully closed position, the die touch position is reached and the control device 4 is made to recognize it. Remember. In the case of injection compression molding, the above adjustment is performed in a state where the left end surface of the piston 63 of the mold clamping cylinder contacts the fixed die plate 12 and the tie bar 61 is locked by the hydraulic tightening machine 213.

Next, the operation of the injection compression molding method for plastics will be described with reference to FIGS. 1, 2 and 10 for the first embodiment. In order to start stamping, the retractable movable die plate 22 is brought closer to the fixed die plate 12 direction by high-speed mold closing by the boost cylinder 31.
As shown in FIG. 3, the tie bar 61 is fixed at a position where the left side 63 a of the piston 63 of the mold clamping cylinder 65 is in contact with the fixed die plate 12. In this state, an unillustrated logic valve or the like is opened, and the discharge amount of the variable pump is sent to the rod side 31b of the boost cylinder 31 and moved to the fixed mold side at a rapid speed.

When the movable die plate 22 reaches a predetermined position with respect to the fixed die plate 12 by the die plate position sensor 100 which detects the distance of the movable die plate 22 (position f1 in FIG. 10), the tie rod 61 and the movable die plate 22. Is fixed by the hydraulic fastening machine 213, the movable die plate 22 is stopped or decelerated. As for the position of the movable die plate 22 at this time, the touch position of the mold is recognized by the control device 4, and the position where the movable die plate 22 is stopped or decelerated is determined according to the stored numerical value. When the movable plate 22 is stopped or decelerated, the hydraulic fastening machine 213 is operated to lock the tie rod 61 and the movable die plate 22. At this time, the tie bar 61 is stopped because the electromagnetic servo valve 66 is in the neutral position. Whether the tie bar 61 is locked by the hydraulic fastening device 213 may be detected by the pressure of the pressure sensor 101.

At this time, when it is confirmed that the locking by the hydraulic tightening machine 213 is completed by the increase of the pressure from the pressure sensor 101, the same sampling signal generated by the main computer 5 triggers each sensor 110a, 110.
b, 110c, 110d index scale 114
The absolute position of each movable die plate 22 is output to the main computer 5 together with the microcomputers 6a, 6b, 6c and 6d of the respective cylinders. The absolute position at this time depends on the touch position of the die, that is, the input value from the die stroke setting means 120 set according to the thickness of the die.

Each sensor 110a with high accuracy,
From the absolute position from 110b, 110c, 110d, the main computer 5 outputs the absolute position to be moved next to each of the microcomputers 6a, 6b, 6c, 6d. Each microcomputer 6
a, 6b, 6c, 6d calculate the difference between the current absolute value and the next absolute value indicated by the main computer 5, and operate by moving the respective electromagnetic servo valves 66a, 66b, 66c, 66d. Take control. The indicated value of the absolute value of the movement amount of the main computer 5 at this time may be the maximum value of the absolute position of the movable die plate 22 from the index scale 114, or may be the maximum value or more. Further, it may be an intermediate value between the minimum value and the maximum value, but at this time, the microcomputers 6a, 6b, 6c,
6d may output a stop signal to the electromagnetic servo valve 66, and the movement may not be performed at a place larger than the intermediate value. Next, the movable die plate 22 is replaced with the fixed die plate 1.
2 becomes parallel to 2, the same movement distance ΔS from the main computer 5 is applied to the microcomputers 6a, 6 of each mold clamping cylinder.
b, 6c, 6d to issue commands to the respective microcomputers 6a, 6
b, 6c and 6d are solenoid servo valves 6 while correcting the parallelism.
6a, 66b, 66c, 66d are actuated to move the resin injected into the cavity 14 to the movable mold 21 at a predetermined speed.
Are moved in parallel for injection compression molding.

As another method, when the difference in absolute position of the movable die plate 22 from the index scale 114 is within a predetermined value, the same moving distance ΔS from the main computer 5 to the microcomputers 6a, 6b, 6c and 6d. The output is controlled and the electromagnetic servo valves 66a, 66b, 66c, 66d are operated by the commands from the microcomputers 6a, 6b, 6c, 6d to correct the parallelism when the absolute position difference deviates from a predetermined value. You can At this time, when the parallel amount deviates from the predetermined prescribed amount, the microcomputers 6a, 6b, 6c, 6d use the difference between the current absolute value and the next absolute value instruction value from the main computer 5 as described above. Is calculated, and the parallel movement is performed while the next movement is controlled so as to fall within a predetermined specified amount.

Next, attachment of the sensor will be described. Although the fixed die plate 12 is distorted by the force generated during mold clamping, one end of the position sensor 110 is attached to the fixed die plate 12 via the spherical surface of the ball joint 111, and the other end is attached to the support plate 9. Fixed guide 11
Since the position sensor 110 is slidably and pivotally supported on the position sensor 2, the position sensor 110 is not directly strained, and the accuracy of the position sensor 110 is improved. For example, FIGS. 9 and 8 show the results of measuring the difference between the conventional structure and the structure of the present invention, and the relative displacement between the fixed die plate 12 and the ball joint during injection compression molding was measured with a gap sensor. The results are shown. As a result, in the conventional product, displacement of 32 μm occurred, but in the present invention, it decreased to 4 μm.

In the above embodiment, as means for measuring the absolute positions of the movable die plate 22 and the fixed die plate 12, the main bodies of the four position sensor linear encoders are fixed to the fixed die plate, and the four corners of the movable die plate are moved. Although the distance is measured, a sensor may be provided on the tie bar to detect it, and in the case where the movable die plate is directly clamped by a hydraulic cylinder, a sensor may be provided on each cylinder for measurement. Further, although four microcomputers are arranged according to the number of cylinders, if the accuracy may be slightly deteriorated, a single computer may be used for calculation, or
Two microcomputers and one main computer may be used.

Although the above embodiment has been described as a mold clamping device for an injection compression molding machine, it goes without saying that it can be used for a mold clamping device such as a compression molding machine, an injection molding machine, or a press machine. In the above-mentioned embodiment, the mold is clamped through the tie bar, but the above-mentioned is used when the movable die plate is moved by the mold clamping cylinder, or when the locking device is provided on the rod of the mold clamping cylinder. You may use an Example.

[0035]

As described above, according to the present invention,
When parallel control is performed by the plurality of actuators of the mold clamping means, even if the locking positions of the tie bar and the movable die plate are misaligned, the tie bar after locking can be easily moved and moved in parallel. That is, the parallelism of the movable die plate can be quickly obtained by the absolute value of the measured values from a plurality of highly accurate measuring devices, and the amount of movement of the movable die plate at the time of rising of the movable plate after locking is increased. The absolute value can be output and the movable die plate can be moved in parallel in the fixed die plate direction. In addition, since one end of the measuring device is a spherical shape such as a ball joint and the other end is pivotally and slidably held, even if distortion occurs due to the reaction force at the time of mold clamping, force acts on the measuring device. It is possible to obtain the excellent effect that the measurement distance can be accurately grasped without doing so, the molded product can be rolled and spread accurately, and the reliability of the measuring device is improved.

[Brief description of drawings]

FIG. 1 is an external view of a mold clamping device of an injection molding machine for explaining the present invention.

FIG. 2 is a schematic side view of an injection compression molding apparatus using a mold clamping device for explaining the present invention.

FIG. 3 is a schematic view of a mold clamping portion for explaining the present invention.

FIG. 4 is a hydraulic circuit of the injection compression molding device.

FIG. 5 is a block diagram of a control device according to an example of the present invention.

FIG. 6 is a view showing an example of a position sensor supporting device of the present invention.

FIG. 7 is a partially enlarged view showing an example of a position sensor.

FIG. 8 is a diagram showing an effect of displacement of the position sensor supporting device of the present invention.

FIG. 9 is a diagram showing displacement of a conventional position sensor supporting device.

FIG. 10 is a time chart at the time of mold clamping of the injection compression molding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection compression molding device 2 Compression molding device 3 Injection device 4 Control device 10 Fixed die plate part 11 Fixed die 12 Fixed die plate 14 Cavity part 20 Movable die plate part 21 Movable die 22 Movable die plate 30 Mold advancing / retracting device 31 Boost Cylinder 60 Mold Clamping Device 65 Mold Clamping Cylinder 66 Electro-hydraulic Servo Valve 68 Variable Type Flow Control Valve 71 Electromagnetic Bylot Pressure Reduction Valve 72 Accumulator 90 Injection Cylinder 100 Position Sensor 101 Pressure Sensor 110 Position Sensor 210 Locking Device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29C 45/76 7365-4F B30B 15/24 8718-4E

Claims (5)

[Claims] 1. A fixed die plate for holding a fixed die, a movable die plate for holding a movable die, a tie bar penetrating the movable die plate and supported by the fixed die plate, and a fixed die plate for the movable die plate. A plurality of mold clamping cylinders that move relative to each other to perform mold clamping, a measuring device that is attached to or near the mold clamping means to measure the length of each mold clamping cylinder, and the measured values and movement instructions. A mold clamping device consisting of a control device that controls the movable mold to move in parallel in accordance with the value, having a plurality of origins on a plane between the movable die plate and the fixed die plate, and
A mold clamping device, wherein a plurality of measuring devices are arranged so that the parallelism of a movable die plate can be detected by a plurality of origins. 2. A mold clamping device comprising at least a fixed die plate for holding a fixed die, a movable die plate for holding a movable die, and a measuring device for measuring a distance of the movable die plate to the fixed die plate. A mold clamping device, characterized in that one end of the measuring device is a spherical shape such as a ball joint, and the other end is pivotally and slidably held. 3. A mold material is housed between a fixed mold and a movable mold, and after locking a plurality of tie bars and a movable plate by a locking device, a mold clamping force of a plurality of mold clamping cylinders is applied to the tie bar. In a mold clamping device for molding a molded product by transmitting and clamping the movable die plate, and moving the movable mold in parallel with the fixed mold while detecting the position of the movable plate during mold clamping. The position sensor of the movable die plate is aligned with the origin of the position sensor provided between the support plate and the support plate, the origin is stored, and the absolute value of the moving amount of the movable die plate is output based on this origin, and the fixed die plate is output. A method for controlling a mold clamping device, characterized in that the movable die plate is moved in parallel with the above. 4. The method according to claim 3, wherein the position sensors are aligned with a plurality of origins, the parallelism of the movable die plate with respect to the fixed die plate is detected, and the movement amount of the mold clamping cylinder is set according to the parallelism. Control method of mold clamping device. 5. A position sensor is fitted to a plurality of origins, the parallelism of the movable die plate is detected with respect to the fixed die plate, and when the parallelism is a predetermined value or less, the same movement amount is output to perform parallel movement, 4. The method of controlling a mold clamping device according to claim 3, wherein a moving amount corrected so as to cause parallel movement when the parallelism exceeds a predetermined value is output, and the parallel movement is performed.