JPH08323831A - Injection compression molding method and apparatus - Google Patents

Abstract

PURPOSE: To stably supply a molding of high quality by performing low pressure mold clamping in such a state that a toggle mechanism is not perfectly extended and controlling injection pressure enabling a resin to fill counting on the shrinkage quantity of the resin and performing high pressure mold clamping after an injection pressure arrives at a set value and synchronously controlling mold clamping force and injection pressure. CONSTITUTION: The extension behavior of a tie bar 11 being the generation theory of the mold clamping force of a toggle mechanism 6 is measured and the oil pressure of a mold clamping cylinder is controlled by an oil pressure control valve 67 so as to hold an initial mold clamping control set value. Injection filling is performed on the basis of resin quantity to which the preset cooling and solidifying shrinkage quantity of a resin is added and the set value of injection pressure to perform low pressure mold clamping. Next, after the stroke of an injection cylinder arrives at a position set value, the monitor of an injection speed is started by an injection speed detection part 61. After it is detected that the detection signal of the injection speed detection part 61 reaches a comparing set value, a comparing control part 63a transmits a high pressure mold clamping start signal to a mold clamping control part 66 through a synchronous control part 69 and the synchronous control part 69 performs the synchronous control of mold clamping force and injection pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention fills a molten resin into a mold in a state where the toggle mechanism is not fully extended, the mold is slightly opened by the pressure of the filled resin, and then the toggle mechanism is fully extended on the mold clamping side. The present invention relates to an injection compression molding method and apparatus for performing compression in a closed state.

[0002]

2. Description of the Related Art When injection compression molding is performed by controlling the mold clamping operation, the mold opening amount during injection filling becomes excessive depending on the initial mold clamping force setting conditions, so that the resin flow state in the mold cavity is injected. Discontinuity occurs when switching between the filling process and the compression process, resulting in defects such as flow marks.
Therefore, it is necessary to perform injection / mold clamping interlocking control that overlaps the mold clamping operation with the injection filling operation, and this timing control of the mold clamping start is an important control for stably supplying high quality molded products. Become.

The conventional injection / mold clamping interlocking control is as follows. That is, by monitoring the amount of retreat of the movable plate or the mold during injection filling, when the amount of retreat ≥ the set value, or by monitoring the amount of change in the mold clamping drive force during injection filling, the amount of change ≥ set When the value is reached, the mold clamping operation is started (mold clamping side signal reference). The filling state (for example, pressure and temperature) of the molten resin in the mold cavity during injection filling is monitored, and the mold clamping operation is started when the monitor value ≧ the set value (mold side signal reference).

The stroke of the injection cylinder or the injection screw during injection filling is monitored, and the stroke position ≧
When the set value is reached, the mold clamping operation is started (injection side signal reference). Completion of initial mold clamping operation, start of injection filling, etc.
It is known that a mold clamping operation is started based on a time-out signal of a timer which is activated with reference to an arbitrary step in the molding step (timer signal reference).

[0005]

However, the conventional injection / mold clamping interlocking control has the following problems. (1) The retreat behavior of the movable plate or the mold during the injection filling is the mold opening reaction force generated by the increase of the resin filled in the mold cavity by the injection filling, and the mold trying to maintain the set mold opening amount. It is caused by the balance with the mold clamping force on the clamping side. Therefore, control status of mold clamping force (control accuracy,
Depending on the responsiveness), the backward movement behavior will change greatly.

Further, when a mold is attached to the movable plate, the mold has a considerable weight, and it is difficult to accurately express the mold opening force associated with injection filling, and the response is low. This significantly affects the change of the mold clamping driving force, and as a result, there is a problem that in many cases detection delay occurs and the optimum mold clamping start timing is shifted. .

In order to solve the above-mentioned problems, it is possible to set the set value, which is the reference for the timing control, to a low value in consideration of the detection delay, but it is difficult because there is no standard for the degree of consideration of the set value. On the contrary, the start of the mold clamping operation due to the overdown causes the compression action from both the injection filling and the mold clamping operation, which is one of the effects of the injection compression molding.
There is a problem that it is expected that it will not be possible to achieve low strain due to the effect of reducing the resin pressure in the mold cavity.

Particularly, in an injection molding machine that performs mold clamping through a toggle mechanism, the toggle characteristic that is advantageous when simply performing mold clamping is a state in which the toggle mechanism is stopped halfway (the toggle is in a bent state). On the contrary, it can be said that the injection compression molding used in (1) is not suitable for detecting the retreat amount or the change amount of the mold clamping drive force.

(2) Although it can be said that the method has higher detection accuracy than the method of (1) above, all the detection signals by the detection sensors such as pressure and temperature are pinpoint measurement, and depending on the sensor mounting location (actually, the ejector may be used). Due to the presence of pins, etc., the mounting location is limited), and it is extremely likely to make a completely different judgment.

It is possible to deal with the above problems by increasing the number of sensors, but since it is a mere aggregate detection signal of pinpoint data, the behavior of the resin in the mold cavity is observed as a whole. Things impossible. Further, there is a problem that a great merit cannot be found because both software and hardware for signal processing are complicated.

Further, the demerits are great because the molds need to be specially processed to mount the sensors on the molds, and the man-hours for mounting the molds are required.

(3) Since the filling behavior is directly detected at the place where the injection filling amount is controlled, the conventional injection / mold clamping interlocking control in which the mold clamping operation overlaps the injection filling operation has been performed. It can be said that it is the most accurate control method among the ones that explained the technology. However, in the conventional method in which the timing control is performed only by the injection stroke position, since the detection method is a method in which the variation in the measured value and the variation in the operating state of the check ring still include the variation in the resin amount, the injection filling is performed. It cannot be said that the behavior can be detected accurately.

Further, in the conventional method, it has not been possible to grasp the filling behavior of the resin in the mold at the same time. Therefore, the fluctuation of the resin temperature (total of the injection cylinder to the mold) during molding is It is difficult to deal with, and it is impossible to stably supply high quality molded products.

(4) Although it is the simplest control method among the methods described in (1) to (4) above, it has the lowest control level and is therefore suitable for injection / mold clamping interlocking control of high precision injection compression molding when used alone. There are many problems such as insufficient.

The present invention has been made in view of the above problems, and an object of the present invention is to perform injection compression in which high-quality molded products are stably supplied by highly accurate timing control of mold clamping start. A molding method and apparatus are provided.

[0016]

In order to achieve the above object, in the first invention, when a hydraulic mold clamping cylinder is driven to open and close a mold through a toggle mechanism, in the mold clamping step, Low-pressure mold clamping is performed in a state where the toggle mechanism does not fully extend, while in the injection filling process, the amount of shrinkage upon cooling and solidification of the resin is calculated in advance, and the resin amount obtained by adding the calculated amount of resin can be filled into the mold cavity. In addition to controlling the injection pressure, after detecting that the injection speed has reached the set value during the injection filling process, the toggle mechanism is extended in the full extension direction to perform high pressure mold clamping, and the injection filled resin is The mold clamping pressure and the injection pressure are synchronously controlled so as not to flow back to the injection mechanism side. In the second aspect of the invention, the mold clamping force detector incorporated in the tie bar is used to detect the state where both molds are touching. Detect and The origin of the stroke of the mold clamping cylinder connected to the mold mechanism, the set mold clamping force in low-pressure mold clamping is detected by the mold clamping force detector, and then set by the stroke advance amount of the mold clamping cylinder from the origin setting position. At the same time, during the injection filling process, the hydraulic pressure of the mold clamping cylinder is controlled so as to hold the movable mold at the set forward position.

In the third aspect of the invention, the detection of the injection speed during the injection filling process is performed at the forward limit of the injection cylinder stroke and the injection cylinder stroke position in the region near the completion of the injection filling until reaching the forward limit. . Further, in the fourth invention, a mold clamping force setting unit for setting the mold clamping force, a mold clamping cylinder stroke sensor for detecting the stroke of the mold clamping cylinder, and detection of the mold touch point in the mold clamping process are incorporated in the tie bar. A mold touch point setting section for setting the origin of the stroke of the mold clamping cylinder based on a detection signal of the mold clamping force detecting section, and a set value of the mold clamping force setting section.
By comparing the detection signal of the mold clamping force detection unit and the detection signal of the mold clamping cylinder stroke sensor, the mold clamping control unit that controls the stroke of the mold clamping cylinder connected to the toggle mechanism to perform mold clamping, and the injection filling. Based on a detection signal from the injection speed detection unit, an injection speed detection unit for detecting the injection speed during the injection filling process, a position setting unit for setting the detection range of the injection speed, and a detection signal from the injection speed detection unit. A comparison control unit for transmitting a high-pressure mold clamping start signal to the mold clamping control unit and a synchronization control unit for synchronously controlling the mold clamping force and the injection pressure after the high-pressure mold clamping is started.

[0018]

[Function] By filling the resin amount by adding the cooling and solidification shrinkage amount of the resin by the injection pressure control capable of filling, the flow resistance is small at the initial stage of the filling, so that the filling is performed at a high speed, and the flow resistance increases at the latter stage of the filling. As a result, the filling speed is naturally reduced, and a natural filling flow (natural flow) without the pack pressure is automatically obtained.

After detecting that the injection speed has reached the set value during the injection filling process, the high-pressure mold clamping is performed to perform the compression process to detect the timing signal of the mold clamping operation start in the injection / mold clamping interlocking control. Direct detection at the place where the injection filling process is controlled. In addition, by using the amount of change in the injection speed as the timing signal, the filling behavior of the molten resin in the mold cavity is also detected, so that the filling of the resin from the injection mechanism side into the mold cavity is performed. The behavior can be grasped comprehensively, and extremely accurate injection / mold clamping interlocking control can be realized.

As a result, high-precision injection compression molding can be controlled without being affected by disturbance factors such as variations in the filling amount due to fluctuations in the operation of the measured value check ring and fluctuations in the resin temperature during molding. It is possible to stably supply high quality molded products.

Further, by detecting the timing signal within a range near the completion of injection filling near the forward stroke limit of the injection cylinder, the mutual relationship between the filling behavior on the injection mechanism side and the filling behavior in the mold cavity is most accurately determined. Since the timing control of the mold clamping start can be performed in the region that can be detected, it is possible to accurately realize the injection / mold clamping interlocking control in which the injection filling operation overlaps the mold clamping operation.

Further, after the high-pressure mold clamping is started, by synchronously controlling the mold clamping force and the injection pressure, in the compression process by the mold clamping operation, from the mold cavity to the injection side, which has hitherto been a particularly problematic problem. Since the backflow of the resin can be prevented, the weight of the molded product becomes stable, and the deformation of the molded product caused by the backflow of the resin can be prevented, so that a high-quality molded product can be stably supplied. Further, since a shut-off valve or the like which is conventionally provided for preventing backflow is not required, cost reduction can be achieved.

[0023]

Embodiments of the injection compression molding method and apparatus according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a control conceptual diagram of an injection molding machine according to the present invention, FIG. 2 is an initial mold clamping condition setting flow chart, FIG. 3 is an injection filling operation explanatory view, and FIG. 4 is a molding operation flow chart.

The injection molding apparatus 100 in this embodiment is
Toggle type mold clamping device 50, injection device 40 and control unit 60
It consists of

FIG. 1 shows an injection molding apparatus 100 equipped with a toggle type mold clamping device 50. The upper half of the center line shows a low pressure mold clamping state, and the lower half of the center line shows a high pressure mold clamping state. . The toggle type mold clamping device 50 in FIG. 1 includes a link housing 1, a fixed platen (fixed platen) 2, a movable platen (movable platen) 3, a mold 4 (a fixed mold 4b and a movable mold 4).
a), cavity 5, toggle mechanism 6, crosshead 7,
It is composed of a mold clamping cylinder (die lock cylinder) 8, a piston rod 9 and a guide rod 10.

In the injection molding device 100 having the double toggle type mold clamping device 50, as shown in FIG. 1, three toggle links 6a are provided between the movable platen 3 and the link housing 1.
A pair of upper and lower toggle mechanisms 6 composed of 6b and 6c are provided, and a mold clamping cylinder (die lock cylinder) 8 is attached to the center of the outer end surface of the link housing 1, and the tip of the piston rod 9 of the mold clamping cylinder 8 is crossed. A guide rod 10 connected to the head 7 and inserted through the crosshead 7 so as to move back and forth.
Along with the forward and backward movement, the toggle mechanism 6 is operated via the crosshead 7 to move the movable platen (movable platen) 3 with respect to the fixed platen 2 to perform the mold clamping operation. . Reference numeral 11 indicates a tie bar.

Next, the injection device 40 will be described. The injection device 40 in the present embodiment has a screw 4 in a barrel 41.
2 is provided, the resin raw material in the hopper 43 is in the supply zone,
It is configured to be heated and compressed in the compression zone, melt-metered in the metering zone, and injected into the nozzle 44 through the injection zone.

A heater for externally heating the resin raw material is provided on the outer peripheral surface of the barrel 41, and the resin raw material is fed forward by the rotation of the screw 42.

Reference numeral 46 is an injection cylinder, and 47 is a forward / reverse rotation motor, which is directly connected to the screw 42 and rotates the screw 42 forward and backward.

Next, the control unit 60 will be described.

The control unit 60 includes an injection speed detection unit 61, a position setting unit 62, an injection control unit 63, a comparison control unit 63a, a timer 65, hydraulic pressure control valves 64 and 67, a mold clamping control unit 66, and hydraulic pressure supply sources 68a and 68b. , Synchronization control unit 69, mold clamping force detection unit 7
0, mold touch point setting unit 71, mold clamping force setting unit 72, mold clamping cylinder stroke sensor 74 and pressure sensor 75.

The synchronous control unit 69 is connected to the injection control unit 63, and the injection control unit 63 controls the operation of the hydraulic control valve 64 for controlling the operation of the injection cylinder 46 and the operation of the forward / reverse rotation motor 47. Each is connected to the tightening control unit 66.

The mold clamping control section 66 is connected to a hydraulic control valve 67 which controls the operation of the mold clamping cylinder 8. 68
Reference numerals a and 68b denote simplified hydraulic pressure supply sources.

A pressure sensor 75 attached to the injection cylinder 46 and an injection speed detecting section 61 are connected, and
The injection speed detection unit 61 includes a position setting unit 62 and a comparison control unit 63.
connected to a. The comparison controller 63a is connected to the timer 65 and the synchronization controller 69, respectively.

A mold clamping force detection unit 70 incorporated in the tie bar 11 for detecting the mold clamping force in the mold clamping process is connected to the mold touch point setting unit 71.

A mold clamping cylinder stroke sensor 74 is disposed on the side of the mold clamping cylinder 8 opposite the crosshead 7 along the piston rod 9, and detects the stroke of the mold clamping cylinder 8 when the set mold clamping pressure is reached. Then, it is used as a means for fixing the operation of the mold clamping cylinder 8 by holding that position.

The mold clamping point setting unit 71 and the mold clamping force setting unit 72 connected to the mold clamping cylinder stroke sensor 74 are connected to the mold clamping control unit 66. The operation of the injection compression molding apparatus configured as described above will be described.

First, as shown in FIG. 2, the mold clamping force setting section 72
The mold clamping control unit 66 controls the hydraulic control valve 67 based on the mold clamping force setting value (S value) of (1) to perform mold clamping.

Next, the mold clamping force detection unit 70 incorporated in the tie bar 11 detects the touch state of both molds 4a and 4b during the mold clamping operation, and the mold touch point setting unit 71 is set as the mold touch point.
The stroke of the mold clamping cylinder connected to the toggle mechanism 6 is set as the so-called mold touch point.

Incidentally, in the present embodiment, embedding the mold clamping force detector 70 in the tie bar 11 has the following advantages. That is, the tie bar 11 that is the principle of generating the mold clamping force of the toggle mechanism 6
Since the distraction (stress) behavior of is directly measured, the measurement accuracy is highest. Since it is a position unrelated to the die mounting part, it is extremely easy to handle.

After the die touch point is set, the die clamping advance operation is further performed, and the die clamping cylinder stroke sensor 74 detects the die clamping cylinder stroke when the detection signal of the die clamping force detector 70 reaches the S value. , Initial mold clamping control setting value (S1 value)
Is stored in the mold clamping force setting unit 72 as.

In the molding operation, the mold clamping cylinder hydraulic pressure is controlled by the hydraulic control valve 67 so as to maintain the S1 value to control the mold clamping force (S value) (mold clamping cylinder position holding control). Here, the characteristics of the toggle mechanism (even if the mold clamping cylinder stroke fluctuates by 1 mm, for example, the movable platen 3
The position variation is 1/10 mm or less, and the setting accuracy of the mold clamping force is extremely high. It is possible to easily control the mold clamping force with extremely high accuracy and high reproducibility.

Next, the procedure for setting the high-pressure mold clamping start timing signal will be described in detail with reference to FIG.

First, injection filling is performed on the basis of preset values of injection filling amount (resin amount obtained by adding resin cooling and solidification shrinkage amount) and injection pressure (fillable pressure of 1 pressure). By doing so, an ideal injection filling behavior (natural flow) can be obtained in which high-speed filling is performed in the initial stage of filling and the filling speed is naturally reduced as the filling progresses.

Then, the range for detecting the timing signal for starting the high-pressure mold clamping is set to the forward limit (E) of the injection cylinder stroke.
Point) and the advance limit (point E), the position of the injection cylinder stroke in the region near the completion of injection filling is set by the position setting section 62 as a position set value (monitoring start point, P). By doing so, the mutual relationship between the filling behavior on the injection mechanism side and the filling behavior in the mold cavity 5 can be detected most accurately, and the injection / mold clamping operation in which the injection clamping operation overlaps the mold clamping operation is performed. Interlocking control can be controlled accurately.

At the same time, the comparison controller 6 sets the timing signal for starting the high-pressure mold clamping as a comparison set value (K value) according to the injection speed.
Set with 3a. By setting the timing signal with the injection pressure, it is possible to comprehensively understand the filling behavior of the resin in the mold cavity 5 from the injection mechanism side. Therefore, the measured value, the variation in the filling amount due to the operation variation of the chuck ring, and the molding process It is possible to stably and accurately detect the timing signal without being affected by the disturbance factors such as the fluctuation of the resin temperature.

Next, the control for starting the high-pressure mold clamping is performed based on the above-mentioned set values (point P, K value). When the injection cylinder stroke reaches the monitoring start point (P), the injection speed detector 61 starts monitoring the injection speed. The injection speed is naturally reduced in accordance with the filling behavior in the mold cavity 5 by the injection filling by the control of the injection pressure capable of filling. Then, when the detection signal of the injection speed detection unit 61 reaches the K value (set speed reaching point, V), the high pressure mold clamping operation is started (compression step).

Then, simultaneously with the start of high-pressure mold clamping (start of the injection / mold clamping interlocking section), synchronous control of the mold clamping force and injection pressure is performed. By doing so, the backflow of the resin from the mold cavity 5 to the injection side can be prevented in the compression process by the mold clamping operation, and as a result, there is no deformation of the molded product due to the backflow, and the backflow is prevented. A shutoff valve etc. is unnecessary. The synchronous control is to maintain the resin pressure balance between the nozzle 44 of the injection device 40 and the mold cavity 5, and the injection is performed in consideration of the compression conditions (mold clamping speed, mold clamping pressure) due to the mold clamping. The pressure control on the mold clamping side and the pressure on the injection side are simultaneously performed so that the cylinder 46 does not retract. That is, the injection pressure is increased at the same time when the mold clamping force starts to be increased, and the resin pressure in the mold cavity 5 and the injection pressure are made equal to prevent the resin from flowing back.

Next, the molding operation procedure following the initial condition setting will be described with reference to FIG.

Low-pressure mold clamping is performed based on the mold clamping force setting value (S1 value) set previously, and injection filling is performed after completion of this low-pressure mold clamping. At the same time, the high-pressure mold clamping start timing control is performed based on the previously set position setting value (point P) and comparison setting value (K value). In addition, the mold opening behavior is exhibited due to the pressure of the resin filled with the injection filling.

After the injection cylinder stroke reaches point P, the injection speed detector 61 starts monitoring the injection speed. After detecting that the detection signal of the injection speed detection unit 61 has reached the K value, the comparison control unit 63a transmits a high-pressure mold clamping start signal to the mold clamping control unit 66 via the synchronization control unit 69, and causes the timer 65 to operate. To start.

As a result, the synchronization control section 69 performs the synchronous control of the mold clamping force and the injection pressure, and performs the injection compression molding in conjunction with the injection / mold clamping.

Here, the timer 65 sets the measurement start time (t1
), And the mold clamping completion time (t2) is set in advance. By the way, t1 is set on the basis of the gate sealing time, and t2 is set by calculating the resin cooling time from the resin temperature, the mold cooling capacity, the shape of the molded product and the like.

Thereafter, based on the time-out signal of the timer 65, synchronous control of injection and mold clamping after the start of high-pressure mold clamping is performed.

[0056]

As is apparent from the above description, according to the present invention, (1) after it is detected that the injection speed during the injection filling step has reached the set value within the range near the completion of filling, By starting the high-pressure mold clamping and performing the compression process, the injection mechanism side is completely unaffected by disturbance factors such as variations in the filling amount due to fluctuations in the measured value and check ring operation and fluctuations in the resin temperature during molding. Since the mutual relationship between the filling behavior and the filling behavior in the mold cavity can be accurately detected and the injection compression molding can be controlled with extremely high accuracy, high quality molded products can be stably supplied. (2) Further, in the compression process, by controlling the injection pressure and the mold clamping pressure synchronously, the reverse flow of the resin from the mold cavity to the injection side can be prevented, so that the quality accuracy of the molded product is extremely improved and the reverse flow is achieved. The cost can be reduced by eliminating the need for a shut-off valve for prevention. (3) Furthermore, by setting the mold touch point with the mold clamping force detector incorporated in the tie bar and holding the mold clamping force by controlling the position of the mold clamping cylinder stroke, the mold clamping force is extremely highly accurate. Since it can be set, high quality molded products can be supplied. (4) The injection amount is controlled by the injection pressure control capable of filling the resin amount obtained by adding the cooling and solidification shrinkage amount of the resin, so that the high-speed filling is performed in the initial stage of the filling and the pack pressure is not generated due to the natural deceleration in the latter stage of the filling. Since a natural natural filling flow (natural flow) is automatically obtained, the operability of control is greatly improved.

[Brief description of drawings]

FIG. 1 is a control conceptual diagram of an injection molding machine according to the present invention.

FIG. 2 is a flowchart for setting initial mold clamping conditions of the injection molding machine according to the present invention.

FIG. 3 is an explanatory diagram of an injection filling operation of the injection molding machine according to the present invention.

FIG. 4 is a flow chart of a molding operation of the injection molding machine according to the present invention.

[Explanation of symbols]

 1 link housing 2 fixed plate 3 movable plate 4 mold 4a movable mold 4b fixed mold 5 cavity 6 toggle mechanism 7 crosshead 8 mold clamping cylinder 9 piston rod 10 guide rod 11 tie bar 40 injection device 41 barrel 42 screw 43 hopper 44 Nozzle 46 Injection cylinder 47 Forward / reverse motor 48 Injection piston 50 Toggle type mold clamping device 60 Control part 61 Injection speed detection part 62 Position setting part 63 Injection control part 63a Comparison control part 64, 67 Hydraulic control valve 65 Timer 66 Mold clamping Control unit 68a, 68b Hydraulic pressure supply source 69 Synchronous control unit 70 Mold clamping force detection unit 71 Mold touch point setting unit 72 Mold clamping force setting unit 74 Mold clamping cylinder stroke sensor 75 Pressure sensor

Claims (4)

[Claims] 1. When a hydraulic mold clamping cylinder is driven to open and close a mold via a toggle mechanism, in the mold clamping step, low pressure mold clamping is performed while the toggle mechanism is not fully extended, while injection is performed. In the filling process, the cooling and solidification shrinkage amount of the resin is calculated in advance, and the resin amount obtained by adding the calculated resin amount is controlled by the injection pressure capable of filling the mold cavity, and the injection speed during the injection filling process is set. After detecting that the value has reached the limit, the toggle mechanism is extended in the full extension direction to perform high-pressure mold clamping, and the mold clamping pressure and injection pressure are controlled synchronously so that the injected and filled resin does not flow back to the injection mechanism side. An injection compression molding method characterized by: 2. The low-pressure mold clamping is performed by using a mold-clamping force detector incorporated in a tie bar to detect the touching state of both molds and setting the stroke of a mold-clamping cylinder connected to a toggle mechanism as the origin. After the set mold clamping force is detected by the mold clamping force detector, it is set by the stroke advance amount of the mold clamping cylinder from the origin setting position, and the movable mold is held at the set advance position during the injection filling process. The injection compression molding method according to claim 1, wherein the hydraulic pressure of the mold clamping cylinder is controlled as described above. 3. The injection speed during the injection filling process is detected at the forward limit of the injection cylinder stroke and at the injection cylinder stroke position in a region near the completion of the injection filling up to the forward limit. Item 2. The injection compression molding method according to Item 1. 4. A mold incorporating a mold clamping force setting section for setting a mold clamping force, a mold clamping cylinder stroke sensor for detecting a stroke of the mold clamping cylinder, and a die touch point detection in a mold clamping process in a tie bar. A mold touch point setting section for setting the origin of the stroke of the mold clamping cylinder based on the detection signal of the mold clamping force detecting section, the set value of the mold clamping force setting section, and the mold clamping A mold clamping control unit that controls the stroke of the mold clamping cylinder connected to the toggle mechanism to perform mold clamping by comparing the detection signal of the force detection unit and the detection signal of the mold clamping cylinder stroke sensor, and injection control that performs injection filling. An injection speed detecting section for detecting an injection speed during an injection filling process, a position setting section for setting a detection range of the injection speed, and the mold based on a detection signal from the injection speed detecting section. Tightening control section An injection compression molding apparatus, comprising: a comparison control unit for transmitting a high-pressure mold clamping start signal to and a synchronization control unit for synchronously controlling the mold clamping force and the injection pressure after the start of high-pressure mold clamping.