JP3265926B2 - Injection compression molding method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of filling a mold cavity of a low-pressure mold with a molten resin, slightly opening the mold by the filled resin pressure, and then increasing the mold pressure by a mold clamping mechanism. TECHNICAL FIELD The present invention relates to an injection compression molding method and an injection compression molding apparatus which are designed to compress.

[0002]

2. Description of the Related Art When performing injection compression molding using an injection molding apparatus of a mold clamping mechanism that performs mold clamping with a hydraulic mold clamping cylinder,
It was carried out by the following method. (1) A stopper or the like is provided in the mold clamping mechanism, and the mold is mechanically locked by the stopper at a predetermined mold opening position. The mold compression process after injection filling is performed by releasing the mechanical lock by the stopper. Alternatively, the compression step is performed by using a separately provided compression-clamping cylinder or the like. (2) A unit dedicated to compression is mounted between the movable platen and the fixed platen of the mold clamping mechanism, and the unit is provided with a mold opening holding and compression process. (3) The position of the movable platen or movable mold is detected, and mold clamping is performed with a low mold clamping force so that the mold is easily opened by injection filling. In the injection filling step, the mold clamping pressure or the injection speed is controlled so that the set mold opening amount and the mold opening speed are obtained.

[0003]

However, when the injection compression molding is performed by the conventional method, there are various problems as described below. (1) Since it is difficult to cope with a change in molding conditions such as a resin temperature during molding, the quality of a molded product varies, and a good product cannot be supplied stably. Also, when shifting from the injection filling to the compression process, a mechanical lag such as a stopper is temporarily released, so a time lag occurs, so that the resin flow behavior in the mold becomes discontinuous, and as a result,
Defects such as flow marks occur, and it is difficult to obtain high quality molded products. Further, the addition of a mechanical locking mechanism or a mold-clamping cylinder dedicated to compression increases the complexity and size of the molding machine, resulting in a significant decrease in productivity.

[0004] (2) Although the molding machine body does not require any major remodeling, the installation of the compression-only unit reduces the effective dimension in which a mold can be mounted (specification of the molding machine is reduced). Therefore, the correspondence to a wide variety of molded products is limited. Further, the compression-only unit is a considerably heavy object, and when the unit is mounted, damage to the molding machine such as deformation of the molding machine, abnormal wear of the sliding portion, and increased load on the drive system is large. Further, it requires connection of a drive source of the unit, connection of a control signal for obtaining operation timing with the molding machine, and the like, and operability is extremely low.

(3) Since injection filling is performed with a mold clamping force applied in advance, the mold opening behavior is not exhibited until the resin pressure by injection filling exceeds the mold clamping force. As a result, before and after the mold opening behavior Changes the resin flow state in the mold cavity,
Although not as large as in (1) above, defects such as flow marks are likely to occur. Therefore, a method of setting an extremely small mold clamping force to facilitate the mold opening behavior can be considered,
In this case, it is necessary to strictly control the mold clamping force or the injection speed so that excessive mold opening behavior does not occur. As a result, extremely high control responsiveness and control accuracy are required. High cost and low operability due to complexity and sophistication.

[0006]

Means for Solving the Problems To solve such problems, it is possible to avoid unnecessary reduction in productivity due to an increase in the size of a molding machine, and to achieve high quality by simple pressure control of mold clamping force and injection pressure. In order to stably supply a molded article, in the method of the present invention, in the first invention, the fixed platen, the movable platen, and the connecting plate are arranged in the axial direction of the tie bar, and the half plate is provided between the movable platen and the connecting plate. A split nut is mounted, a tie bar is provided with a threaded portion or a groove to be fitted with the half-split nut, and a fixed cylinder is fixedly provided with a moving cylinder and a mold clamping cylinder connected to the tie bar. When the movable platen is moved forward and backward in the direction of the fixed platen, and the injection compression molding is performed using a mold clamping mechanism that presses the movable platen toward the fixed platen side with the mold clamping cylinder to apply a mold clamping force, Move the movable plate to the fixed plate and move both After the half nut is engaged with and fixed to the screw portion or groove portion of the tie bar in a state where is touched, injection filling is performed, and the retreat amount of the mold during the injection filling corresponds to the cooling solidification shrinkage amount of the resin. After detecting that the position has been reached, the injection filling is stopped, and the compression step is performed by applying a mold clamping force with the mold clamping cylinder.

Further, in the apparatus according to the second invention, in the first invention, the detection of the retreat amount of the mold is performed based on a change amount of a gap between the movable platen and the half nut. Further, in the third invention, when performing injection compression molding using a mold clamping mechanism, the movable platen is advanced to the fixed platen side by the movable cylinder, and the two halves are screwed with the tie bar while the two dies are touching. And the gap between the movable platen and the half-split nut with the mold clamping cylinder so that the retraction amount of the mold due to injection filling is at the mold opening position corresponding to the amount of cooling, solidification and shrinkage of the resin. After adjusting and holding, the injection filling is performed, and after detecting that the half nut and the movable plate have come into contact with each other during the injection filling, the injection filling is stopped, and the mold clamping cylinder is used to reduce the mold clamping force. The compression process was performed under load.

In the fourth invention, the fixed platen, the movable platen, and the connecting plate are arranged in the axial direction of the tie bar, and have a half nut mounted between the movable platen and the connecting plate. Is provided with a screw portion or a groove portion to be fitted with the half nut, the fixed plate is provided with a mold clamping mechanism in which a moving cylinder and a mold clamping cylinder connected to the tie bar are fixed, and the injection filling operation is performed. A position detection unit that includes an injection control unit for controlling the mold and a mold clamping control unit for controlling the mold clamping operation, and detects a retreat amount of the mold during injection filling, and a mold opening position corresponding to a cooling solidification shrinkage amount of the resin. A mold opening amount setting unit that sets the position, a detection signal of the position detection unit and a setting value of the mold opening amount setting unit, and transmits an injection stop signal to the injection control unit and to the mold clamping control unit. Control with a comparison control unit that sends a mold clamping pressure increase start signal And an injection compression molding apparatus having a location.

Further, in the fifth invention, the fixed platen, the movable platen and the connecting plate are arranged in the axial direction of the tie bar, and have a half nut mounted between the movable platen and the connecting plate.
The tie bar is provided with a screw portion or a groove portion to be fitted with the half nut, the fixed plate is provided with a mold clamping mechanism in which a moving cylinder and a mold clamping cylinder connected to the tie bar are fixed, and the injection filling is performed. An injection control unit to perform, a mold opening amount setting unit for setting a mold opening position corresponding to the amount of cooling, solidification, and shrinkage of the resin,
A half nut position detecting unit for detecting a gap between the half nut and the movable platen, and a mold clamping operation is controlled by comparing a set value of the mold opening amount setting unit with a detection signal of the half nut position detecting unit. A mold clamping control unit that performs contact detection between the half nut and the movable plate during injection filling by the half nut position detection unit based on the contact detection signal of the half nut position detection unit. An injection compression molding apparatus having a control device including a timing control unit for transmitting an injection stop signal to the injection control unit and transmitting a mold clamping pressure increasing start signal to the mold clamping control unit.

[0010]

According to the present invention, the injection filling operation is stopped after the retreat amount of the mold during injection filling reaches the mold opening position corresponding to the amount of the resin solidifying and contracting. By applying the clamping force and performing the compression process,
Since the resin supplied to the mold cavity is almost fully filled (just pack), there is no defect such as a flow mark due to discontinuity of the resin flow rate in the mold even when the compression process is switched. . Therefore, it is not necessary to provide an extremely sophisticated timing control for switching the compression process, which is conventionally required. In addition, since the injection filling amount is controlled based on the mold opening amount on the mold clamping side, errors in the filling amount caused by the injection side, such as fluctuations in measured values and fluctuations in the operation of the check ring, can be eliminated. The variation in weight is extremely small, and as a result, a high-quality molded product can be stably supplied. In addition, during the injection filling process, the mold clamping force is not yet applied at all, so the mold opening behavior due to the injection filling occurs easily and continuously from the initial stage of the injection filling.
The resin in the mold cavity is injected and filled while being kept at a very low pressure, and as a result, the pressure deviation of the resin due to the injection and filling is kept very small, so that the effect of preventing deformation and distortion is further promoted, and High quality molded products can be obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 relate to the present invention, FIG. 1 is an overall configuration diagram of an injection compression molding apparatus, FIG. 2 is a process procedure diagram of a molding operation, and FIG. 3 is an overall configuration diagram of an injection compression molding apparatus showing another embodiment. FIG. 4 is a process procedure diagram of a molding operation showing another embodiment.

As shown in FIG. 1, the injection compression molding apparatus 100 includes a mold clamping device 1, an injection device 40, and a control device 60. The mold clamping device 1 includes a moving cylinder 2, a mold clamping cylinder 3, a tie bar 7, a fixed plate 10, a screw engagement adjusting device 11, a movable plate 20, a half nut 22, a tie bar locking device 26, a fixed mold 30a, and a movable metal. It is composed of a mold 30b, a connecting plate 50, and the like. A central convex portion of the movable mold 30b is fitted in a central concave portion of the fixed mold 30a, so that the movable mold 30b can move forward and backward slidably. Reference numeral 5a denotes a piston rod chamber, 8 denotes a screw portion (or groove portion), and 28 denotes a mold cavity.

Next, the injection device 40 will be described. In the injection device 40 in this embodiment, a screw 42 is provided in a barrel 41, and a resin material in a hopper 43 is heated and compressed in a supply zone and a compression zone, melted and weighed in a measurement zone, and passed through an injection zone to a nozzle 44.
It is configured to be injected into the interior. A heater for externally heating the resin material is provided on the outer peripheral surface of the barrel 41, and the resin material is sent forward by the rotation of the screw 42. Reference numeral 46 denotes an injection cylinder, and 47 denotes a forward / reverse rotation motor.
, So that the screw 42 rotates forward and backward.

Next, the control device 60 will be described. The control device 60 includes an injection control unit 63, a hydraulic control valve 64, a mold clamping control unit 66, a hydraulic control valve 67, and hydraulic supply sources 68a, 68.
b, comparison control section 69, timer 70, mold opening amount setting section 71,
It comprises a position detector 72 and the like.

The injection control unit 63 is connected to the mold clamping control unit 66 and the comparison control unit 69, and is connected to a control device (not shown) for controlling the operation of the forward / reverse rotation motor 47 via the hydraulic control valve 64. . On the other hand, the mold clamping control unit 66 is connected to the comparison control unit 69, is connected to the piston rod chamber 5 a of the mold clamping cylinder 3, and sends a control command to the mold clamping cylinder 3 via the hydraulic control valve 67. The comparison control unit 69 includes a timer 70, a mold opening amount setting unit 71, and a half nut 22.
And a position detection unit 72 for detecting a gap between the movable platen 20 and the movable platen 20, and compares a detection signal of the position detection unit 72 during injection filling with a set value set by the mold opening amount setting unit 71 to perform mold clamping control. A mold clamping pressure increase start command and an injection stop command are transmitted to the section 66 and the injection control section 63, respectively.

The operation of the injection compression molding apparatus 100 configured as described above will be described. First, after confirming the normally performed mold clamping operation and unloading operation, a test molding operation is performed. This test molding operation usually involves several “throwing-out”
Is performed, and the appropriate values of the injection filling amount, the injection pressure and the mold clamping pressure according to the characteristics of the resin are grasped to obtain information on the condition setting. After setting conditions in test molding operation,
Perform production molding operation. Specifically, the operation is performed according to the following procedure according to the operation procedure as shown in FIG.

(1) The movable platen 20 is moved forward by the movable cylinder 2 toward the fixed platen 10 and, after the two dies 30a and 30b touch, the drive of the movable cylinder 2 is stopped. (2) The half nut opening / closing cylinder 26 is driven to completely mesh and fix the half nut 22 and the screw portion or groove portion of the tie bar 7. Here, in advance, both molds 30a,
Rotating a motor previously connected by a chain so that the half nut 22 and the screw or groove of the tie bar 7 are completely meshed with each other based on the mold thickness (die height value) of 30b and the pitch of the screw or groove. By
Rotate the sprocket to adjust the amount of forward / backward movement of the adjustment shaft. In this case, the half nut 22 and the movable platen 20 have a gap calculated from the die height value and the pitch so that the half nut 22 can be smoothly driven. That is, this gap serves as a movable adjustment allowance when the mold retreats (mold opening behavior) due to injection filling. Further, in this case, since the mold clamping force has not yet been applied, the mold shows a continuous mold opening behavior from the initial stage of injection filling, and as a result, reasonable injection filling can be performed. (3) The injection control unit 63 controls the hydraulic control valve 64 to start the injection filling process. Since no mold clamping force is applied,
In response to the injection filling operation, the movable mold 30b moves backward and shows the mold opening behavior. That is, the mold cavity 28
Since the resin inside is filled at a very low pressure, the pressure deviation due to the filling is extremely small, and as a result, the effect of preventing deformation and distortion is further promoted.

(4) At the same time, the position detector 72 detects the amount of change in the gap between the half nut 22 and the movable platen 20, that is, the amount of retreat movement (the amount of mold opening) of the movable mold 30b. In addition,
The method of detecting the opening amount of the mold may be a method of directly attaching a detection sensor to a mold or a method of attaching a detection sensor to a movable platen. The method of detecting the gap between the two was adopted. In the case of detecting with a mold, the operability is poor because a detachment operation of the detection sensor is required for each mold to be used. Further, since the detection sensor is attached to the mold, the handling during molding is hindered. When detecting with a movable platen, it is generally considered to be used in common with a detection sensor for setting and monitoring the mold thickness (die height value) of both molds. The detection accuracy is low with the sensor. Therefore, when the sensor is replaced with a high-precision sensor, the sensor for setting and monitoring the die height value has a long stroke, so that the cost is considerably increased. With the detection method using the gap between the half nut and the movable platen, the detection sensor can perform small-sized, short-stroke and low-cost, high-precision detection. In addition, since it can be incorporated into a molding machine, operability and handling are not impaired at all.
Further, since the half nut 22 and the position detection sensor for adjusting the meshing of the screw portion or the groove portion of the tie bar 7 can be shared, the cost can be further reduced. (5) The detection signal of the position detection unit 72 (the retreat amount of the movable mold) reaches the mold opening amount set value (S) corresponding to the amount of cooling, solidification, and contraction of the resin set in the mold opening amount setting unit 71 in advance. After detecting that, the comparison control unit 69 transmits an injection stop signal to the injection control unit 63 and a mold clamping pressure increasing (compression) start signal to the mold clamping control unit 66. In this way, the mold cavity 28 is almost completely filled with the resin (just pack). Therefore, even when the compression process is switched, there is no defect such as a flow mark caused by the discontinuity of the resin flow velocity in the mold. Becomes Therefore, it is not necessary to perform an extremely sophisticated timing control for switching the compression process, which is conventionally required. In addition, since the injection filling amount is controlled based on the mold opening amount on the mold clamping side, errors in the filling amount due to the injection side such as fluctuations in the measured value and check ring operation can be eliminated. It is possible to obtain a high-quality molded product with extremely small variation in weight. Note that the injection stop operation can employ the following two methods. Stop and hold the forward movement of the injection cylinder (holding pressure switching operation). The resin filling passage is shut off (shut-off valve closing operation).

(6) The compression step and the injection-side control are performed based on a time-out signal of a timer that starts upon detecting that the detection signal of the position detecting section has reached the set value of the mold opening amount setting section. Here, the weighing start time t ₁ is set based on the gate sealing time, and when the shut-off valve is installed, based on the shut-off valve closing operation completion time. The cooling completion time t ₂ is calculated based on the resin temperature, the mold cooling capacity, the shape of the molded product, and the like, and is set as the compression completion time at the same time. (7) In response to the timeout signal of the weighing start time t ₁ , the comparison control unit 69 transmits a weighing start signal to the injection control unit 63 to start the weighing operation. Similarly, in response to the timeout signal of the cooling completion time t ₂ , the comparison controller 69 causes the mold clamping controller 6
6. A cooling completion signal is transmitted to 6 to take out the product through the mold opening operation, and the next molding operation is started.

Next, another embodiment of the present invention (second embodiment)
Will be described with reference to FIGS. Differences between the second embodiment and the first embodiment shown in FIGS. 1 and 2 will be described below. In the configuration of the control device 60, in the second embodiment, the comparison control unit 69 and the position detection unit 72 are eliminated, and a timing control unit 74 and a half nut position detection unit 73 are newly provided instead. Regarding the mold clamping device 1 and the injection device 40, the second embodiment is not different from the first embodiment.

The operation of the injection compression molding apparatus 100A according to the second embodiment configured as described above will be described. As in the first embodiment, after setting conditions in the test molding operation, the production molding operation is started. Specifically, the operation is performed according to the following procedure according to the operation procedure shown in FIG. (1) The movable platen 20 is moved forward by the movable cylinder 2 until the two dies 30a and 30b touch. Both molds 30a,
After the touch by 30b, the driving of the movable cylinder 2 is stopped, and the half nut 22 is engaged and fixed to the screw portion or the groove portion of the tie bar 7 by the half nut opening / closing cylinder 26. (2) The mold clamping control section 66 operates the hydraulic control valve 67 to supply pressure oil to the mold clamping cylinder 3 to perform the mold clamping operation. In this case, the half nut 22 and the movable platen 2
Numeral 0 denotes a state in which a gap is provided, and the tie bar 7 and the half nut 22 fixedly integrated with the tie bar 7 are both pulled out and slid toward the fixed board. That is, the half nut 22 is slid in the direction in which it comes into contact with the movable platen 20.

(3) At the same time, the displacement amount of the gap between the half nut 22 and the movable platen 20 is detected by the half nut position detecting unit 73. After detecting that the detection signal of the half nut position detecting unit 73 has reached the mold opening amount set value corresponding to the amount of cooling, solidification and shrinkage of the resin set by the mold opening amount setting unit 71, the mold clamping control unit 66 sets the mold clamping control unit 66. Close the mold closing cylinder 3 so that the opening set value is maintained.
To control the oil pressure. In this manner, the mold opening behavior due to injection filling is such that the movable mold 30b can move backward by the gap between the half nut 22 and the movable platen 20, and an amount of mold opening corresponding to the amount of cooling, solidification, and contraction of the resin can be obtained. (4) While the injection filling process is started, the mold opening behavior, that is, the change amount of the gap between the half nut 22 and the movable platen 20 is detected by the half nut position detection unit 73.

(5) The detection signal of the half-split nut position detection unit 73 (the amount of retreat of the movable mold) reaches the mold opening set value (S) previously set by the mold opening setting unit 71. In other words, in other words, after detecting that the half nut 22 and the movable platen 20 are in contact with each other, the timing control unit 74 sets the injection control unit 6
An injection stop signal is transmitted to 3 and a mold clamping pressure increase (compression) start signal is transmitted to the mold opening control unit 66. Thus, the mold cavity 28 is almost completely filled with the resin (just pack).
When switching the compression process, there is no occurrence of defects such as flow marks due to the discontinuity of the resin flow velocity in the mold cavity 28, and extremely advanced timing control of the compression process switching which has been conventionally required is realized. It becomes unnecessary.
Further, since the injection filling amount is controlled on the basis of the mold opening amount on the mold clamping side, it is possible to eliminate an error factor of the filling amount due to the injection side such as a fluctuation of the measured value and the check ring operation. Therefore, it is possible to obtain a high-quality molded product in which the weight variation of the molded product is extremely small. Further, at the time of the start of the mold clamping, the half nut 22 and the movable platen 20 are already in contact with each other, and a compressive load can be realized by increasing the mold clamping pressure without a response delay. High quality molded products can be obtained. (6) The compression process and the injection side control are performed by the half nut 22
The operation is performed in the same manner as in the first embodiment in response to a time-out signal of a timer 70 that is activated upon detecting that the movable plate 20 has come into contact with the movable plate 20.

[0024]

As described above, in the present invention,
The following excellent effects can be obtained. (1) At the same time as the retreat movement amount of the mold during injection filling reaches the mold opening amount set value corresponding to the amount of resin solidification shrinkage, injection filling is stopped and compression is performed by applying a mold clamping force. As a result, the resin in the mold cavity is in a just-packed state, and there is no defect such as a flow mark due to discontinuity of the resin flow.As a result, extremely advanced timing control is not required when switching the compression process.
Operability is improved. (2) Since the injection filling amount is controlled on the mold clamping side, it is possible to eliminate a filling amount error factor due to the injection side such as a measurement value and a variation in operation of a check ring, thereby stably producing a high quality molded product. Can supply. (3) Since no mold clamping force is applied during the injection filling, the mold opening behavior by the injection filling is easy and continuous, so that the resin in the mold cavity obtains a uniform pressure distribution. Furthermore, since there is no response delay in the mold clamping start operation, it is possible to obtain an extremely high quality molded product having high transferability, low distortion, and low deformation.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an injection compression molding apparatus according to an embodiment of the present invention.

FIG. 2 is a process procedure diagram of a molding operation in an injection compression molding method according to an embodiment of the present invention.

FIG. 3 is an overall configuration diagram of an injection compression molding apparatus according to another embodiment of the present invention.

FIG. 4 is a process sequence diagram of a molding operation in an injection compression molding method according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold clamping device 2 Moving cylinder 3 Mold clamping cylinder 7 Tie bar 8 Screw part (groove part) 10 Fixed platen (fixed platen) 20 Movable platen (movable platen) 22 Half nut (half nut) 26 Tie bar locking device (half nut) Opening / closing cylinder) 28 mold cavity 30a fixed mold 30b movable mold 40 injection device 41 barrel 42 screw 43 hopper 44 nozzle 46 injection cylinder 47 forward / reverse rotation motor 48 piston 60 control device 63 injection control unit 64 hydraulic control valve 65 mold clamping Force setting unit 66 Mold clamping control unit 67 Hydraulic control valve 68a Hydraulic supply source 68b Hydraulic supply source 69 Comparison control unit 70 Timer 71 Mold opening setting unit 72 Position detection unit 73 Half nut position detection unit 74 Timing control unit 100 Injection compression Molding device 100A Injection compression molding device

Claims (5)

(57) [Claims] 1. A fixed plate, a movable plate and a connecting plate are arranged in the axial direction of a tie bar, a half nut is mounted between the movable plate and the connecting plate, and the tie bar is fitted with the half nut. The fixed platen is fixedly provided with a moving cylinder and a mold clamping cylinder connected to the tie bar.The moving cylinder moves the movable plate toward and away from the fixed platen, and the movable platen moves with the mold clamping cylinder. When performing injection compression molding using a mold clamping mechanism that applies a mold clamping force by pressing the board toward the fixed board side, the movable cylinder is advanced to the fixed board side by the moving cylinder, and both molds are touched. Injection filling is performed after the half nut is engaged with and fixed to the screw portion or groove portion of the tie bar, and the retreat amount of the mold during the injection filling reaches a mold opening position corresponding to the amount of cooling, solidification, and shrinkage of the resin. After detecting Injection compression molding method characterized by performing the compression step by loading a mold clamping force by the mold clamping cylinder stops the filling. 2. The injection compression molding method according to claim 1, wherein the detection of the retreat amount of the mold is performed based on a change amount of a gap between the movable platen and the half-split nut. 3. When performing injection compression molding using the mold clamping mechanism according to claim 1, the movable platen is advanced to the fixed platen side by a moving cylinder, and the half nut is tie-bared with both molds touching. The movable platen and the half nut with the mold clamping cylinder so that the retreat amount of the mold by injection filling is at the mold opening position corresponding to the amount of cooling, solidification and shrinkage of the resin. After the gap is adjusted and maintained, injection filling is performed. After detecting that the half nut and the movable plate have come into contact with each other during the injection filling, the injection filling is stopped, and the mold clamping cylinder is used for mold clamping. An injection compression molding method in which a compression step is performed by applying a force. 4. A fixed platen, a movable platen, and a connecting plate are arranged in the axial direction of the tie bar, and have a half nut mounted between the movable platen and the connecting plate. A screw portion or a groove portion to be fitted with the mold, a fixed platen having a mold clamping mechanism in which a moving cylinder and a mold clamping cylinder connected to the tie bar are fixed, and an injection control unit for controlling an injection filling operation. A position detection unit that includes a mold clamping control unit that controls the mold clamping operation, detects a retreat amount of the mold during injection filling, and a mold opening amount that sets a mold opening position corresponding to the amount of cooling, solidification, and contraction of the resin. A setting unit, which compares a detection signal of the position detection unit with a set value of the mold opening amount setting unit, transmits an injection stop signal to the injection control unit, and transmits a mold clamping pressure increasing start signal to the mold clamping control unit. Compression control having a control device having a comparison control unit for transmitting a signal Apparatus. 5. A fixed platen, a movable platen and a connecting plate are arranged in the axial direction of the tie bar, and have a half nut mounted between the movable platen and the connecting plate. The fixed platen is provided with a mold clamping mechanism fixedly provided with a moving cylinder and a mold clamping cylinder connected to the tie bar, and an injection control unit for performing injection filling, and a resin. A mold opening amount setting unit for setting a mold opening amount position corresponding to the amount of cooling, solidification and shrinkage, a half nut position detecting unit for detecting a gap between a half nut and a movable platen, and setting of the mold opening amount setting unit. A mold clamping control unit that controls a mold clamping operation by comparing the value with a detection signal of the half nut position detection unit, and detects the contact between the half nut and the movable plate during injection filling. The position detection unit is contacted with the half-split nut position detection unit. Injection compression molding apparatus having a controller having a timing control unit for transmitting a clamping pressure increase start signal to the mold clamping control unit while transmitting the injection stop signal to the injection control unit on the basis of the known signal.