JP3198800B2 - Mold compression molding method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold compression molding method and apparatus, and more particularly, to a method and apparatus capable of controlling a compression speed, a compression pressure and a distance between mold surfaces in a mold compression step with high accuracy. It is about.

[0002]

2. Description of the Related Art A vertical mold clamping device used for injection compression molding is disclosed, for example, in Japanese Patent Laid-Open No. 1-264823.
As described in the publication, a mold clamping cylinder is provided above the movable platen, and the movable platen is supported in equilibrium with respect to the fixed platen by a hydraulic cylinder provided between the movable platen and the fixed platen. Structures are known. In this case, by controlling the hydraulic cylinder, adjustment of a mold opening, a mold clamping speed, and the like in a mold compression process is performed.

[0003]

In the die compression process in injection compression molding, the die compression speed and displacement are extremely small. On the other hand, in the above conventional configuration,
Since a hydraulic cylinder is used as a means for adjusting the movable platen of the mold clamping device, the following problems occur.

(1) Due to the compressibility of hydraulic oil, the pressure change corresponding to the position fluctuation of the hydraulic cylinder is very small, and the response speed is slow. For this reason, it is difficult to control the amount of mold compression and the mold compression force with high precision required for mold compression molding. (2) Since the control accuracy of the hydraulic cylinder fluctuates due to a change in physical properties due to the temperature of the hydraulic oil, an error occurs in the control accuracy of the mold compression amount and the mold compression speed.

(3) Due to the above (1) + (2), the control accuracy of the movable platen by the hydraulic cylinder is extremely low.
For example, since the limit is about 100 to 50 μm,
It is difficult to cope with mold compression molding requiring high precision control. The present invention has been made in view of the above points, and provides a mold compression molding method and apparatus in which the distance between the movable platen and the fixed platen is adjusted with extremely high accuracy and the control of the compression speed and the compression pressure is accurate. It is intended to be.

[0006]

According to the present invention, there is provided a mold compression molding method comprising the following steps: (1) A movable platen is provided with a mold clamping mechanism for generating a forward / backward movement and a mold clamping force, and the movable platen and the fixed platen are adjusted. A mold clamping device including a rod, a motor for moving the adjustment rod forward and backward, a rod adjustment unit including a rod feed mechanism, and a plurality of platen surface distance adjustment mechanisms including a rod receiving unit including a force sensor. In performing the die compression molding, in the die compression process, the speed of the adjusting rod is controlled according to a preset program while a predetermined load is applied to the force sensor, and the die clamping mechanism based on the output signal of the force sensor. Compression force control. (2) In the die compression molding method described in (1), a specific allowable value is set for the die compression force, and when the die compression force exceeds the allowable value, the moving speed of the adjusting rod is corrected to reduce the die compression force. It was made to be within the allowable value. (3) The die compression molding method according to (1), wherein a mold clamping mechanism is provided in correspondence with each of the plurality of platen surface distance adjusting mechanisms, and the die compression process control is performed by the plurality of platen surface distance adjusting mechanisms. , Independently or in pairs. (4) In the mold compression molding method according to (1), the movable
Press the platen to the fixed platen side to change the movable type to the fixed type
A movable platen moving process for adjusting the reference point to be brought into contact in advance
And the adjustment rod and rod support of the platen-to-platen distance adjustment mechanism.
A reference point adjustment step of adjusting the reference point by contacting the
After this reference point adjustment, the adjustment rod is
By moving forward by the set stroke, the movable mold is fixed.
Mold compression that separates the mold to the position required for mold compression
Quantity adjustment process and injection of molding material into movable and fixed molds
Before the adjustment, apply a predetermined force to the rod
The following steps were taken. (5) In the mold compression molding method according to (4), the standard
After the point adjustment, the molding material is injected into the movable mold and the fixed mold.
And press the adjustment rod into contact with the rod
How to separate the movable mold from the fixed mold according to the injection stroke
The movable platen moves backward to the direction
After the volume was reached, the mold compression process was started . (6) The method according to (1), wherein
Of the drive system of the platen distance adjustment mechanism
The current value was used as the detection signal. According to the invention
In that type compression molding apparatus, (7) a movable mold for molding is fixed to the movable platen fixed
Each movable platen is fixed to the platen
A mechanism to move the platen forward and backward
The ten is equipped with a mold clamping mechanism that generates mold clamping force.
And either the movable platen or the fixed platen
The movable platen is mounted so that it can move in the forward / backward movement direction.
Attached mechanical feed mechanism and adjustment rod and adjustment rod
Rod adjuster with prime mover to drive the other
The rod receiving part and the rod
Adjustment lock with a detector that detects the force applied to the
Platen surface distance adjusters composed of
And drive of the platen surface adjustment mechanism
The rotation of the drive motor that drives the adjustment rod is set in advance in the system.
According to the specified program or the preset program
Speed to control according to the output signal of the correction value to correct the ram
Servo controller and output signal output from force sensor
A mold clamping force control device that controls the mold clamping force of the mold clamping mechanism based on
The configuration was provided. (8) The mold compression molding apparatus according to (7), wherein
Set input values such as compression reference point and mold compression amount and mold compression force
And a force sensor or drive
Comparing the detection signal from the dynamic motor with the set value
Each drive of platen surface distance adjustment mechanism and mold clamping mechanism
Output to the system as control signals of control values or correction values.
The arithmetic processing unit and each detection signal and control signal
Input / output interface for input / output and input keyboard
Speed Servo Control Device and Model Having Mode and Display
Equipped with a tightening force control device and a force sensor
Each drive unit of the distance adjustment mechanism between Latin surfaces and the drive unit of the mold clamping mechanism
And are mutually connected. (9) In the compression molding apparatus according to (7), the force
Of the drive unit of the platen-to-platen distance adjustment mechanism
Inputs the current value as a detection signal to the input / output interface
A configuration using a current detector to be used.

[0007]

[Operation] The detection signal (F_Two ) And mold clamping mechanism
The generated mold clamping force (F₀ ) And the compression process
Molding material pressure (P₁ ) Corresponding to the mold compression force (F₁ )connection of
Is F₀ = F₁ (= P₁ ) + ΣF_Two Becomes That is,
At the same time as controlling the moving speed of the adjustment rod,
Outgoing signal (F _Two ) Based on the mold clamping force (F₀ )
By controlling the mold compression speed in mold compression molding
And mold compression force (F₁ = P₁ ) Control with high accuracy
Can be.

In addition, the molding material behavior in the mold compression process,
In other words, the function of detecting the change in the material pressure (P ₁ ) by the detection signal (F ₂ ) from each force sensor enables stable measurement regardless of the mold shape and the injection behavior of the molding material. Can be. Further, a plurality of plug <br/> Ten level distance adjusting mechanism and mechanical adjustment mechanism, and, by being independently by controlling each of said <br/> plurality of platen surface distance adjusting mechanism, High-precision control of speed, position, and responsiveness can be performed, and the movable platen can be arbitrarily tilted as needed, so that it is possible to cope with diversifying mold compression molding conditions.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of an entire mold clamping device 1 of a vertical injection compression molding apparatus or a mold compression molding apparatus. The mold clamping device 1 is provided with a movable platen 3 for holding a movable die 2 also serving as an upper die of a mold for compression molding, and a fixed platen 5 for holding a fixed die 4 also serving as a lower die. The movable platen 3 is moved vertically with respect to the fixed platen 5, and the movable platen 3 is pressed toward the fixed platen 5 to clamp the movable mold 2 and the fixed mold 4. 8 and is provided.

As shown in FIGS. 2 and 3, columns 7 project from four corners of the upper surface of the fixed platen 5, respectively. Further, a cylinder support member 8 is fixed to upper ends of the four columns 7. The mold clamping cylinder 6 is fixed downward at the center of the cylinder support member 8. As shown in FIG. 3, the mold clamping cylinders 6 can be divided into a plurality of mold clamping cylinders 6a having a capacity corresponding to the number of divisions, for example, four.

The mold clamping device 1 has a platen surface distance adjusting mechanism (hereinafter referred to as a platen adjusting mechanism) 11 for adjusting the posture of the movable platen 3 to an arbitrary position and an angle with respect to the fixed platen 5 side. It is installed. The platen adjustment mechanism 11 has a four platen mounted on the movable platen 3 side.
There are provided two movable adjustment units 12 and four fixed adjustment units 13 mounted on the fixed platen 5 side and provided in correspondence with the respective movable adjustment units 12. Each of the movable-side adjustment units 12 is disposed inside the four columns 7 as shown in FIGS.

Further, as shown in FIGS. 4 and 6, each movable-side adjusting unit 12 has an adjusting rod 14 mounted on the movable platen 3 so as to be movable in the vertical movement direction of the movable platen 3, and this adjusting rod. A ball screw type feed mechanism 15 for driving the movable platen 14 in the operation direction of the movable platen 3 is provided.

Here, the adjusting rod 14 is provided with a male screw-shaped screw shaft portion 16 constituting a ball screw on the upper side, and a spline shaft portion 17 on the lower side. The ball screw type feed mechanism 15 is provided with a ball screw 18 and a spline bearing 19 fixed to the movable platen 3, respectively, and a drive motor 20 for rotating the adjustment rod 14 is provided. I have. Further, a speed reducer 21 such as a planetary gear unit or a cyclo speed reducer is interposed between the drive motor 20 and the adjustment rod 14. The adjusting rod 14 may have a rack and pinion structure instead of a ball screw structure, and the same effect is obtained.

A unit mounting plate 22 is fixed above the movable platen 3. This unit mounting plate 22
Guide shafts 23 are projected from the four corners.
As shown in FIG. 6, a guide plate 24 for holding the speed reducer 21 is attached to these four guide shafts 23 so as to be vertically movable. The guide plate 24 has the motor mounting member 2
The drive motor 20 is attached via the fifth motor 5.

Further, the rotary shaft 20a of the drive motor 20 is connected to a high-speed shaft on the input side of the speed reducer 21. The upper end of the screw shaft 16 of the adjusting rod 14 is connected to a low-speed shaft on the output side of the speed reducer 21 via a connecting member 26. When the drive motor 20 is driven, the drive motor 2
The rotational force from 0 is transmitted to the screw shaft 16 of the adjusting rod 14 in a state where the rotational force is reduced by the speed reducer 21, and the screw along the ball operation of the female screw in the ball screw 18 with the rotation of the screw shaft 16. The screw shaft portion 16
It moves up and down itself. At this time, the guide plate 24 is driven up and down along the four guide shafts 23 with the vertical movement of the adjusting rod 14, and the drive motor 2
0 and the speed reducer 21 are moved up and down together with the adjustment rod 14.

The screw shaft 1 of the adjusting rod 14
6, a double-type thrust ball bearing 2 as shown in FIG.
The end of the spline shaft 17 is connected via a bearing box 28 in which the shaft 7 is built. The rotation of the screw shaft 16 of the adjusting rod 14 is absorbed by the double thrust ball bearing 27 in the bearing box 28, and only the movement is transmitted to the spline shaft 17 so that the spline shaft 17 is splined. It is guided by the bearing 19 and moves up and down.

As shown in FIG. 5, the fixed-side adjustment unit 13 is provided with a plurality of rod receiving portions 29 which are respectively spaced apart from and opposed to the respective adjustment rods 14 and are in contact with the respective adjustment rods 14. A load sensor (pressure detecting means) 30 for detecting the contact pressure of each adjustment rod 14 that comes into contact with the portion 29 is provided. In addition,
A spacer having an appropriate thickness may be mounted between the movable adjustment unit 12 and the fixed adjustment unit 13 in accordance with the thickness of the injection mold. FIG. 1 shows a method in which the lower side of the adjusting rod 14 is extended downward and the spacer is not used. However, as shown in FIGS. 4 and 7, the lower end of the adjusting rod 14 or the spline shaft 17 is short. Therefore, a relatively long rod-shaped spacer (not shown) is used.

Further, a hydraulic cylinder 31 is mounted on the fixed adjustment unit 13 to prevent the platen adjustment mechanism 11 from being damaged when an overload is applied. And
The hydraulic cylinder 31 is connected to a hydraulic control circuit (not shown) for keeping the hydraulic pressure in the hydraulic cylinder 31 constant. Note that the hydraulic cylinder 31 is not necessarily provided.

Further, a mold clamping force control device (control means) 32 is connected to each load sensor 30. A hydraulic control valve 33 for controlling the operation of the mold clamping cylinder 6 and a speed servo controller 34 for controlling the operation of each drive motor 20 are connected to the mold clamping force control device 32, respectively. 33a
Is a simplified hydraulic supply source.

In mold clamping control in mold compression molding,
The mold clamping force control device 32 and the speed servo control device 34 are controlled based on the detection signal from each load sensor 30,
The following control of the mold clamping device 1 is performed.

First, when adjusting the compression reference point between the movable mold 2 and the fixed mold 4 of the injection mold, the platen adjusting mechanism 1 is used.
One reference point adjustment is performed. At the time of this reference point adjustment, the movable platen 3 is operated by the mold clamping cylinder 6, and the movable mold 2 is moved to the mold clamping position where the movable mold 2 comes into contact with the fixed mold 4 (movable platen moving step for adjusting the reference point). As described above, when the movable mold 2 is in contact with the fixed mold 4, the posture of the movable platen 3 is adjusted to be parallel to the fixed platen 5 side. At this time, the adjusting rods 14 of the four movable-side adjusting units 12 are previously moved upward, and the movable mold 2
The adjustment rod 14 is made to stand by at an appropriate position where the adjustment rod 14 does not come into contact with the rod receiving portion 29 of the fixed-side adjustment unit 13 at the time of contact with the fixed mold 4.

Next, while the movable platen 3 is held at the mold clamping position, the four drive motors 20 are driven, and the respective adjustment rods 14 are respectively operated downward to come into contact with the rod receiving portions 29. In this case, the drive motor 20 stops when the load sensor 30 detects that the adjustment rod 14 is in contact with the rod receiving portion 29 (reference point adjustment step). Then, the position of each adjustment rod 14 at this time becomes a reference point adjustment position, which is input to the storage unit 41 in the mold clamping force control device 32 and the speed servo control device 34, and the reference point adjustment work is completed.

The above-mentioned reference point adjustment is performed while the movable mold 2 is in contact with the fixed mold 4.
May be performed in a state in which a fixed mold clamping force is applied.

Next, after the reference point adjustment work is completed, the mold compression amount is set. The drive motor 20 is driven to operate each adjustment rod 14 by a preset stroke amount to stop the drive motor 20 (a mold compression amount adjustment step). At this time, the back pressure P of the mold clamping cylinder 6 is set to a value at which the drive motor 20 can be driven, and this value needs to be constantly maintained. Before the molding material is injected into the movable mold 2 and the fixed mold 4, a predetermined force is applied to the rod receiving portion 29 by the adjusting rod 14.

Now, the pressure of the mold clamping cylinder 6 is set to P,
Output of F6₀ , Formed by movable mold 2 and fixed mold 4
Material pressure generated in molding material such as resin in mold cavity
To P ₁ , The force generated in the movable mold 2 is F₁ , Adjustment rod 14
The force generated in F_Two In the stopped state, the force of each part
F₀ , F₁ , F_Two Is as follows.

Since the molding material has not been injected yet, the material pressure P ₁ becomes 0 and F ₁ also becomes 0. Mold clamping cylinder 6
Output F ₀ of, the force required to preload in the allowable load P _S1 of the adjusting rod 14, to set the pressure P corresponding to the force by the pressure control valve 33. At this time, F ₀ = ΣF ₂ .

[0027] In this state, the molding material from an injection device (not shown) is injected into the mold cavity, the material pressure P ₁ is generated. In this material pressure P ₁ is generated, which corresponds force F ₁ which is generated, correspondingly, the force F ₂ is reduced.
The relationship between these three forces is F ₀ = F ₁ + ΣF ₂ .

On the other hand, F_Two Is reduced, the clamping force control device
32 calculates the difference from the set value by the arithmetic processing unit 40,
A pressure increase signal is output to the pressure control valve 33. As a result, the pressure
P rises and F₀ Also increase power. As a result,
, F₀ = F₁ + ΣF _Two Holds, and F
_Two Is also a set value. In this way, material filling (injection)
The material pressure P₁ Also increases, and P₁ Is made
The mold area to be used increases, and F₁ Increases as pressure x area
So F₀ Also increase.

Next, when the compression start point comes, the drive motor 2
0 rotates and the adjusting rod 14 is speed-controlled by the speed servo controller 34 according to a preset program.
Perform the compression step. If the compression process is performed, naturally P ₁
However, the compression force always automatically sets F ₀ corresponding to F ₁ in the relation of F ₀ = F ₁ + ΣF ₂ . As a result, the compression speed accurately executes the set program.

At this time, since the amount of compression of the platen adjusting mechanism 11 changes depending on the size of F ₂ , if F ₂ is fed back to the speed servo controller 34, more precise control is possible.

This mold clamping operation will be described with reference to FIG. 8 which shows a relationship diagram between stroke and pressure. First, the detected value F ₂ from the load sensor 30 increases due to the mold clamping operation by the mold clamping cylinder 6. Here, the detection value F ₂ is controlling the pressure P to fit the allowable pressure range P _S1 of each part, for example, the extent to which the ball screw portion 18 is not damaged platen adjusting mechanism 11.

On the other hand, if a predetermined amount of mold compression is compressed at a predetermined speed, the mold compression force F ₁ also changes, so that the detected value F _2, which is the mold reaction force, becomes F _S0 <F ₂ <F _S1 . The mold clamping force F ₀ of the mold clamping cylinder 6 is increased so that the mold compression force F ₁ (F ₀ −) corresponding to the material pressure P ₁ accompanying the mold compression operation is increased.
.SIGMA.F ₂₎ simultaneously with the load reaches the mold compression amount Smax set in advance. As described above, in the mold compression process, the speed control of the drive motor 20 and the pressure control of the mold clamping cylinder 6 are simultaneously performed. The horizontal axis in FIG. 8 indicates the movement amount (stroke) of the movable mold 2 or the movable platen 3. F _S0 is
The lower limit of the allowable force range when operating the platen adjustment mechanism 11 is shown.

Here, the mold clamping force control device 32 or the speed servo control device 34 and each of the platen adjustment mechanisms 11 are associated with each other, and each is independently controlled, so that the detection signal from each load sensor 30 can be used. The position and the moving state of the movable mold 2 or the movable platen 3 can be grasped, and the drive control of each drive motor 20 can be corrected, if necessary, to optimize the movable mold 2 and the fixed mold 4 in the mold compression molding. A good posture relationship. Incidentally, not only controls independently each of the platen adjusting mechanism 11, for example, as a two by two, more 1
It can also be controlled in pairs.

Further, the movable mold 2 or the movable platen 3
Is required to be tilted in an arbitrary direction, the drive signal set in each drive motor 20 is used to control the moving speed and to detect the detection signal F ₂ from each load sensor 30.
Thereby, the mold clamping force F ₀ can be controlled and responded.

Further, instead of the output signal of the load sensor 30, the amount of change in the current value or the amount of change in the torque of the drive system of the drive motor 20 is detected by the current detector 36 and used as a control signal for each control device. It is also possible. In addition,
The output signal of the load sensor 30 and the output signal of a change in the current value or the like of the drive system of the drive motor 20 may be used at the same time, or they may be used as needed. Further, it is also possible to detect the change amount of the position of the drive motor 20 with the position detector 35 and perform the detection.

The above-described mold clamping operation relates to an operation of adjusting the set amount of mold compression during injection or after filling when the movable mold 2 and the fixed mold 4 are separated from each other in advance, and performing mold compression molding. As described above, after the mold compression amount adjusting step, the mold compression and the mold opening and the mold clamping are performed while injecting the molding material while the movable mold 2 and the fixed mold 4 are in contact with each other or during the operation of separating the mold. It is also possible. In this case, the drive motor 20 is driven so that the detected value F ₂ within an allowable pressure range _{F S0 <F 2 <F S1} , mold opening, with the speed control to operate in the direction of clamping, The compression force control of the mold clamping cylinder 6 is performed simultaneously.

In some cases, it is desirable to mold with a mold compression force according to the material properties, depending on the molding material.
Also in this case, by setting the mold compression force F ₁ to the allowable value F ₁ ′ according to the material properties, in the mold compression process, the detected value F ₂ is set to fall within the range of F _S0 <F ₂ <F _S1 . In addition, it is possible to cope with this by appropriately correcting the moving speed of the adjusting rod 14 and controlling the moving speed so as not to exceed the allowable value F ₁ ′.

The adjusting rod 14 and the rod receiving portion 29
After adjusting the reference point by contacting the movable mold 2 and the movable mold 2 and the fixed mold 4, the molding material is injected into the movable mold 2 and the fixed mold 4. The mold compression process may be started after the movable platen 3 is appropriately moved backward in the direction in which the mold 2 is separated from the fixed mold 4 and reaches a preset mold compression amount.

FIG. 9 shows a schematic configuration of the mold clamping control circuit.
An input / output interface 39 for inputting and outputting detection signals from the load sensor 30, the position detector 35, the current detector 36, and other detectors, and control signals to be output to the respective driving units of the mold clamping cylinder 6 and the driving motor 20. The mold clamping force control device 32 and the speed servo control device 34 are composed of a storage unit 41 for storing the set conditions and an arithmetic processing unit 40 for comparing and processing the set value and the detection signal and outputting a control signal. . In the storage unit 41, input values of the mold compression reference point, the mold compression amount, the mold compression force, the direction and amount of tilt when the movable platen 3 is tilted in an arbitrary direction, the input value of the time distribution, and the like are set as the set values. Remember. In the figure,
35 is a position detector such as an encoder for detecting the stroke of the drive motor 20, 37 is an input keyboard for inputting setting conditions, and 38 is a display unit.

The most significant feature of the present invention is that the mold compression control is performed using a mechanical adjustment mechanism without using a hydraulic cylinder mechanism for the platen surface adjustment mechanism (platen adjustment mechanism) 11.

When a conventional hydraulic cylinder mechanism is used for the platen adjusting mechanism 11, the mold reaction force generated on the rod of the hydraulic cylinder is F _2C . When the mechanical adjusting mechanism of the present invention is used, The mold reaction force generated on the adjustment rod 14 is F _2M , the displacement of the movable platen 3 when using the rods of these hydraulic cylinders is ΔL _C , and the displacement of the movable platen 3 when the adjustment rod 14 is used is ΔL _{When M} is set, the rod and the adjusting rod 14 have the same cross-sectional area, and the rod compressive stress generated in the rod and the adjusting rod 14 is, for example, 80 MPa. explanation is omitted, variations of the movable platen 3 when the mold reaction force F ₂ is varied (increased) (displacement amount [Delta] L) is as follows.

ΔL _M = 0.005 mm / ton ΔL _C = 0.095 mm / ton, and the ratio between ΔL _M and ΔL _C is 1:19, which is a very large difference. In other words,
The accuracy and speed of the load measurement are 19 times greater than those of the hydraulic type.
You can say that it is twice as good. To illustrate the above, FIG.
It will be like 0.

In addition to the difference in the effect of the displacement, the mechanical height of the platen adjusting mechanism 11 is 6 to 7 times greater than that of the conventional hydraulic cylinder mechanism. It also has the effect of being shorter. And
In particular, the difference between the effects is further increased in consideration of the fact that the stroke distance in the compression molding process is small and the speed of the stroke is also small.

In the above-mentioned embodiment, an example of vertical die compression molding has been described. However, the present invention is not limited to a vertical die compression molding, and can be used in a horizontal die compression molding. In this case, like the movable platen 3 and the movable mold 2, the platen adjustment mechanism 11 is mounted in a horizontal state so as to operate in the horizontal direction.

In the above embodiment, the movable adjustment unit 12 including the adjustment rod 14, the feed mechanism 15, the drive motor 20, and the like is mounted on the movable platen 3, and the fixed unit including the rod receiver 29 and the load sensor 30 is fixed. The side adjustment unit 13 is mounted on the fixed platen 5, but this is reversed, and the adjustment rod 14, the feed mechanism 15, the drive motor 20
Alternatively, a mechanism including the rod receiving portion 29 and the load sensor 30 may be mounted on the movable platen 3.

[0046]

According to the present invention, there is provided an adjusting rod, a motor for driving the adjusting rod, a rod adjusting portion having a rod feed mechanism, and a mechanical platen surface adjusting mechanism having a rod receiving portion having a force sensor. By performing mold compression molding while simultaneously controlling the moving speed of the adjustment rod and the compression force of the mold clamping mechanism attached to the movable platen, the following advantages are obtained as compared with the hydraulic cylinder system.

[0047] (1) Since a force F ₁ generated in the movable mold can be accurately detected early, it is leveling adjustment and type compression amount control of high-precision movable platen, to obtain a good dimensional accuracy high-quality molded articles Can be. (2) Since the control response speed is extremely high, and there is no variation in control accuracy due to the influence of external factors such as temperature changes, high-precision mold compression molding can be performed, and a high-quality molded product can be stably obtained. Can be. (3) a force F ₁ measurement generated in the movable mold is not mold cavity pressure sensor method, hard to perform the mounting work and operations, etc., software is excellent economic effect becomes unnecessary.

Further, by independently controlling the platen surface distance adjusting mechanisms, (4) mold clamping control can be arbitrarily performed according to the injection conditions.
Since molding defects such as piece contact can be prevented, the molding operation is stabilized, and a significant improvement in productivity can be obtained. (5) Since tilting mold clamping control in any direction is possible,
It can respond to diversified mold compression molding.

Further, since the detection means for control has a double structure, (6) the detection accuracy is improved and unexpected troubles can be promptly dealt with, thereby reducing the productivity by stopping the molding machine. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of an apparatus for carrying out the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a view showing another embodiment corresponding to a cross-sectional view taken along line AA of FIG. 1;

FIG. 4 is a front view showing a movable-side adjustment unit.

FIG. 5 is a front view showing a fixed-side adjustment unit.

FIG. 6 is a longitudinal sectional view showing a connecting portion between a drive motor and a ball screw type feed mechanism.

FIG. 7 is a longitudinal sectional view showing a connecting portion of a spline shaft.

FIG. 8 is a force characteristic diagram showing a change state of a force during a mold clamping operation of the mold compression molding.

FIG. 9 is a circuit diagram showing an embodiment of mold clamping control.

FIG. 10 is a load-displacement diagram showing a comparison between the present invention and a conventional method.

[Explanation of symbols]

 Reference Signs List 1 mold clamping device 2 movable mold 3 movable platen 4 fixed mold 5 fixed platen 6, 6a mold clamping cylinder 11 platen surface distance adjustment mechanism (platen adjustment mechanism) 12 movable side adjustment unit 13 fixed side adjustment unit 14 adjustment rod 15 feed mechanism Part 16 screw shaft part 17 spline shaft part 18 ball screw part 20 drive motor 23 guide shaft 29 rod receiving part 30 load sensor (pressure detecting means) 31 hydraulic cylinder 32 mold clamping force control device (control means) 33 hydraulic control valve 34 speed Servo controller 35 Position detector 36 Current detector 37 Input keyboard 38 Display unit 39 Input / output interface 40 Arithmetic processing unit 41 Storage unit

Claims (9)

(57) [Claims] A movable platen is provided with a mold clamping mechanism for generating a forward and backward movement and a mold clamping force, and an adjustable rod, a motor and a rod feed mechanism for moving the adjustable rod forward and backward are provided on the movable platen and the fixed platen. When performing mold compression molding using a mold clamping device having a plurality of platen surface distance adjusting mechanisms having a rod adjusting portion having a rod receiving portion having a force sensor, a predetermined force is applied to the force sensor in the mold compression process. Mold compression molding characterized in that the speed of the adjusting rod is controlled according to a preset program in a state where a load is applied, and at the same time, the compression force of the mold clamping mechanism is controlled based on the output signal of the force sensor. Method. 2. The method according to claim 1, wherein a specific allowable value is set for the mold compression force, and when the mold compression force exceeds the allowable value, the moving speed of the adjusting rod is corrected so that the mold compression force falls within the allowable value. 2. The method according to claim 1, wherein the compression molding is performed. 3. A mold clamping mechanism is provided in correspondence with each of the plurality of platen surface distance adjusting mechanisms, and control of the mold compression process is independently performed by each of the plurality of platen surface distance adjusting mechanisms or by a plurality of sets. 2. The method according to claim 1, wherein the method is performed by the following method. 4. A movable platen is pressed toward a fixed platen.
A movable tool for adjusting the reference point to bring the movable mold into contact with the fixed mold in advance.
Latin movement process and adjustment of platen distance adjustment mechanism
Reference for adjusting the reference point by bringing the rod and rod receiver into contact
After the point adjustment process and this reference point adjustment, the adjustment rod is
To advance the stroke to the receiving side by the preset stroke
Move the movable mold away from the fixed mold to the position required for mold compression.
Adjusting the amount of mold compression to be inserted
Before injecting molding material, rod receiving part
Applying a predetermined force to the body.
2. The method of molding and compression according to 1. 5. After the reference point is adjusted, the movable mold and the fixed mold are formed.
Inject molding material and press adjusting rod against rod receiving part
While making contact, the movable mold is changed to the fixed mold according to the injection stroke.
Move the movable platen back in the direction to separate
After the set amount of mold compression is reached, start the mold compression process
The mold compression molding according to claim 4, characterized in that:
Method. 6. A method for controlling a distance between platen surfaces instead of a force sensor.
Using the current value of the drive system of the regulating mechanism as the detection signal.
2. The method according to claim 1, wherein the compression molding is performed. 7. A movable mold for molding comprises a movable platen and a fixed mold.
The movable platen is held by the fixed platen, respectively.
With a mechanism to move the back and forth with respect to the fixed platen
If the platen has a mold clamping mechanism that generates mold clamping force,
Either movable platen or fixed platen
The movable platen can move in the forward and backward movement directions
Installed mechanical feed mechanism and adjustment rod and adjustment rod
A rod adjustment unit equipped with a prime mover
The rod receiving part and the rod
Adjustment rod equipped with a detector that detects the force applied to the
Adjustment of the distance between multiple platen surfaces composed of
And a drive mechanism for adjusting the distance between the platens.
The rotation of the drive motor that drives the adjustment rod
According to the set program or the preset program
Control speed according to the output signal of the correction value that corrects the gram
Output signal output from the servo controller and force sensor
Clamping force control device that controls the clamping force of the clamping mechanism based on the
A compression molding apparatus comprising: 8. A mold compression reference point, a mold compression amount and a mold compression force.
A storage unit that stores the input value of the
The detection signal from the sensor or drive motor and the set value
Compare and process the platen distance adjustment mechanism and mold clamping
Control signal of control value or correction value for each drive system of the mechanism
Processing unit that outputs the signals, and each detection signal
I / O interface for input and output of control signals
Speed servo having a unit, input keyboard and display unit
A control device and a mold clamping force control device are provided.
Sensor unit and each drive unit of the plurality of platen surface distance adjustment mechanisms.
The drive unit of the mold clamping mechanism is interconnected
The mold compression molding apparatus according to claim 7. 9. A method for adjusting a distance between platen surfaces instead of a force sensor.
The current value of the drive unit of the
-The use of a current detector input to the interface
The mold compression molding apparatus according to claim 7, wherein