JP3128055B2 - Injection press 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 holds a mold with a predetermined gap open, fills a mold cavity with a molten resin, and then closes the gap with a mold clamping device to perform compression. The present invention relates to an injection press molding method and an injection press molding device.

[0002]

2. Description of the Related Art Conventionally, when performing injection press molding by controlling a mold clamping operation, depending on initial mold opening amount setting conditions, a resin flow state in a mold cavity is switched between an injection filling step and a compression step. At the same time, resulting in defects such as flow marks. For this purpose, injection and mold-clamping interlocking control that overlaps the mold-clamping operation with the injection-filling operation is necessary, and this timing control of mold-clamping start is an important control for stably supplying high-quality molded products. Becomes

[0003] The conventional injection / mold clamping interlocking control is as follows. In other words, monitor the position of the movable platen or mold during injection filling,
The mold clamping operation is started when the mold position ≧ set value or the change amount of the mold clamping driving force during injection filling is monitored, and when the change amount ≧ set value, the mold clamping operation is started. ). The state of filling (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 monitor value ≧ set value (mold side signal reference). The stroke of the injection cylinder or injection screw during injection filling is monitored, and when the stroke position ≧ set value, the mold clamping operation is started (injection side signal reference). It is known that the mold clamping operation is started based on a time-out signal of a timer that starts based on an arbitrary step in the molding process such as completion of the initial mold clamping operation or start of injection filling (timer signal basis).

[0004]

However, the conventional injection / mold clamping interlocking control has the following problems. (1) The position fluctuation of the movable platen or the mold during the injection filling attempts to maintain the mold opening reaction force generated by the increase in the pressure of the filled resin in the mold cavity due to the injection filling and the set mold opening amount. This is caused by the balance with the mold clamping force on the mold clamping side. Therefore, depending on the control state (control accuracy / responsiveness) of the mold clamping force, the degree of the position change greatly changes. Furthermore, when the mold is attached to the movable plate, the movable plate has a considerable weight, and it is difficult to accurately express the mold opening reaction force accompanying the 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 the detection is delayed in many cases and the optimal mold clamping start timing is shifted.
To solve the above problem, it is conceivable to set the reference value for timing control to a lower value in consideration of detection delay, but it is difficult because there is no standard for the degree of consideration of the set value. By starting the mold clamping operation early due to the down, the compression action from both the injection filling and the mold clamping operation achieves one of the effects of the injection compression molding, reducing distortion due to the effect of reducing the resin pressure inside the mold cavity. There is a problem that it is expected to be impossible. (2) Although it can be said that the detection accuracy is higher than the method of the above (1), the detection signals from the detection sensors such as pressure and temperature are all pinpoint measurements, and depending on the sensor mounting location (actually, such as ejector pins) The installation location is limited due to the presence), and it is very likely that a completely different judgment will be made. It is conceivable to cope with the above problem by increasing the number of sensors. However, since the signal is merely an aggregate detection signal of pinpoint data, the resin behavior in the mold cavity cannot be observed as a whole. further,
There is a problem that great merits cannot be found due to the complexity of both software and hardware for signal processing. Further, the disadvantages are large because special processing is required for the dies for mounting the sensors and the like on the dies, and the number of mounting steps is required for each of the dies.

(3) The injection / mold clamping interlocking control in which the mold filling operation is overlapped with the injection filling operation by directly detecting the filling behavior at the place where the injection filling amount is controlled, is a conventional method. It can be said that this is the most accurate control method among the techniques described above. However, in the conventional method in which the timing control is performed only based on the injection stroke position, the detection method includes a variation in the amount of resin caused by a variation in the measured value and a variation in the operation state of the check ring. It cannot be said that the behavior has been accurately detected. Furthermore, in the conventional method, it has not been possible to simultaneously grasp the filling behavior of the resin in the mold, and it is difficult to cope with fluctuations in the resin temperature during molding (from the injection mechanism to the mold). However, high-quality molded products cannot be supplied stably. (4) This is the simplest control method among the above-described prior arts, but the control level is the lowest, and therefore, when used alone, it is insufficiently adapted to the injection / mold clamping interlocking control of high precision injection compression molding. It is. Had many problems. The present invention has been made in view of the above problems, and an object of the present invention is to provide an injection press molding method and a high-precision mold-clamping start timing control so that a high-quality molded product is stably supplied. It is to provide a device.

[0006]

Means for Solving the Problems To solve the problems described above, it is possible to avoid unnecessary productivity increase due to the enlargement of the molding machine, and to perform molding by simple control of mold opening control and injection pressure control. In order to stably supply a high-quality molded product without being affected by fluctuations in molding conditions during the process, in 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. Arranged, a half nut is mounted between the movable platen and the connecting plate, and a screw portion or a groove portion is provided on the tie bar to be fitted with the half nut, and the fixed platen is provided with a moving cylinder and a tie bar. The connected mold clamping cylinder is fixed,
The moving cylinder moves the movable plate in the direction of the fixed plate, and the mold clamping cylinder presses the movable plate toward the fixed plate to apply the clamping force. Calculate and inject the resin amount obtained by adding the cooling solidification shrinkage amount by injection pressure control capable of filling the mold cavity, and hold the mold at a predetermined mold opening position on the mold clamping mechanism side in advance. After detecting that the injection speed of the injection mechanism during the injection filling process has been reduced to the set value, the compression process is started by applying the mold clamping force, and the mold clamping pressure of the mold clamping mechanism and the injection mechanism are controlled. The injection pressure was controlled synchronously. According to a second aspect, in the first aspect, the detection of the injection speed during the injection filling step is performed at an injection cylinder stroke position in a region near the completion of the injection filling up to the forward limit of the injection cylinder stroke. did. Further, in the third invention, in the first invention and the second invention, the movable platen is advanced in advance by the movable cylinder, and the position of the movable platen is set to the origin in a state where both dies are touched, and a predetermined mold opening is performed. Amount position is set by retracting the movable platen with the movable cylinder by the retracted amount of the movable platen from the origin setting position, and the half nut is fitted and fixed to the screw portion or groove portion of the tie bar. With the mold clamping cylinder, mold clamping is performed until the half nut and the movable plate abut, and after the half nut and the movable plate abut, the mold clamping cylinder is held so as to hold the movable mold at the set retreat position. We decided to control the oil pressure. Further, in the fourth invention, the fixed platen, the movable platen and the connecting plate are arranged in the axial direction of the tie bar, a half nut is mounted between the movable platen and the connecting plate, and A screw or groove for fitting with the nut is provided, and a fixed cylinder is fixedly provided with a moving cylinder and a mold clamping cylinder connected to the tie bar, and the movable cylinder moves the movable plate toward and away from the fixed plate. Equipped with an injection control unit that controls injection filling using a mold clamping mechanism that applies a mold clamping force by pressing the movable platen to the fixed platen side with the clamping cylinder, detects the mold opening amount setting unit and the position of the movable platen A position detection unit, an origin setting unit that sets the origin of the position of the movable plate in a state where both dies are touched, and a mold clamping reference detection unit that detects contact between the half nut of the mold clamping mechanism and the movable plate. The set value of the mold opening amount setting section and the position detection. And a mold clamping control unit for controlling the mold clamping operation by comparing the detection signals of the unit and the mold clamping reference detecting unit, and an injection speed detecting unit for detecting an injection speed during the injection filling process, and a detection of the injection speed. A position setting unit that sets a range, a comparison control unit that transmits a mold clamping start signal to the mold clamping control unit based on a detection signal transmitted from the injection speed detection unit, and a mold clamping pressure after mold clamping is started. And a synchronous control unit for synchronously controlling the injection pressure.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the injection filling step, the injection pressure is controlled so that filling can be performed. Since the flow resistance of the resin in the mold cavity is small in the initial stage of filling, high-speed filling is achieved. The operation of the injection filling control is performed because the accompanying filling speed is naturally reduced, and as a result, an ideal natural filling flow (natural flow) having a continuous speed gradient and no pack pressure is automatically obtained. It becomes extremely easy. After detecting that the injection speed of the injection mechanism during the injection filling process has been reduced to the set value, the compression process is performed by applying a mold clamping force, so that a timing signal for starting the mold clamping operation in the injection / mold clamping interlocking control. Is detected directly at the point where the injection filling process is controlled. In addition, by using the 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 resin is filled from the injection mechanism side into the mold cavity. The behavior can be comprehensively grasped, and extremely accurate injection / clamp interlocking control can be realized. As a result, high-precision injection press molding can be controlled without being affected by disturbance factors such as variations in the filling amount due to fluctuations in the measured values and operation of the check ring and fluctuations in the resin temperature during molding. Stable molded products can be supplied stably.

Further, after the start of mold clamping, synchronous control of the mold clamping force and the injection pressure is carried out, so that the resin from the mold cavity to the injection side, which has been particularly problematic in the past, is a compression process by the mold clamping operation. Can be prevented, and the weight of the molded article is stabilized, and the deformation of the molded article caused by the backflow of the resin can be prevented, so that a high-quality molded article can be stably supplied. Further, since a shut-off valve or the like conventionally provided for preventing backflow is not required, cost reduction can be achieved. Further, by detecting the timing signal within a range near the completion of the injection filling near the forward limit of the injection cylinder stroke, the correlation between the filling behavior on the injection mechanism side and the filling behavior in the mold cavity can be detected most accurately. Since the timing control of the mold clamping start can be performed in the region, the injection / mold clamping interlocking control in which the mold filling operation is overlapped with the injection filling operation can be accurately realized.

[0009]

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 press molding apparatus, FIG. 2 is a flowchart showing an initial condition setting procedure in mold opening mold clamping control, and FIG. 3 is a setting of a mold clamping start timing signal. Explanatory diagram showing the procedure, FIG.
5 is a flowchart showing a molding operation procedure of the injection press molding method.

As shown in FIG. 1, an injection press molding apparatus 100 according to the present invention comprises 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 mold. 30b
And a connecting plate 50. Fixed mold 30a
Is mounted on a fixed platen 10 fixed to the upper surface of one end of a machine base (not shown), while the movable mold 3 is mounted on the upper surface of the other end of the machine base so as to face the fixed plate 10.
0b is attached to the movable platen 20. This fixed mold 3
The opposing surfaces of the movable mold 30a and the movable mold 30b are configured to engage with irregularities, and define a cavity 28 between the fixed mold 30a and the movable mold 30b. The distal ends of the piston rods 6 of the movable cylinder 2 fixed to both sides of the fixed platen 10 are attached to the movable platen 20, and the movable platen 20 is fixed to the fixed platen 10.
Can slide on and off the machine base.

The tie bar 7 penetrating the movable platen 20
A plurality of pieces having the same overall length (4 in the present invention)
One end is fixed to the internal piston 5 of the mold clamping cylinder 3, and the other end is penetrated in a direction substantially perpendicular to the connection plate 50, and is then fixed by tightening with a nut or an end plate. The tie bar 7 and the connecting plate 50 are prevented from turning around by using a key or the like.

At the substantially middle position of the tie bar 7, when the movable mold 30b and the fixed mold 30a come into contact with each other at the time of closing the mold, the movable plate 20 is engaged with a half nut 22 described later to move the movable platen 20 to the tie bar 7.
A screw portion or a groove portion is formed to be locked to the base.

Next, the injection device 40 will be described. In this embodiment, the injection device 40 includes a screw 4 in a barrel 41.
2 is provided, and the resin material in the hopper 43 is supplied to the supply zone,
It is configured to be heated and compressed in a compression zone, melt metered in a metering zone, and injected into a nozzle 44 via an injection zone.

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

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

Next, the control device 60 will be described. As shown in FIG. 1, the control device 60 includes an injection control unit 61, a synchronization control unit 62, a comparison control unit 63, a timer 64, a hydraulic control valve 65, a mold clamping control unit 66, a hydraulic control valve 67, an injection speed detection unit. 68, hydraulic supply sources 68a, 68b, position setting unit 69,
Mold opening amount setting unit 70, origin setting unit 71, mold clamping reference detecting unit 7
2. It is composed of a position detector 73.

The injection control unit 6 connected to the synchronization control unit 62
1 is a hydraulic control valve 6 for controlling the operation of the injection cylinder 46
5 and a control device (not shown) for controlling the operation of the forward / reverse rotation motor 47.

On the other hand, the synchronization control unit 62 is
The comparison control unit 63 is also connected to the injection speed detection unit 68 connected to the position setting unit 69 via the comparison control unit 63, and the comparison control unit 63 is connected to the timer 64. The injection speed detecting unit 68 is connected to the injection cylinder 46 and detects the moving speed of the screw 42. Reference numerals 68a and 68b indicate simplified hydraulic supply sources.

On the other hand, the mold opening amount setting section 70 is connected to the mold clamping reference detecting section 72 and receives a detection signal from a position sensor incorporated in the movable platen 20 via the origin setting section 71. It is connected to the unit 73.

The operation of the injection press molding apparatus 100 configured as described above will be described. FIG. 2 shows an initial condition setting procedure in the mold opening mold clamping control. Initial conditions are set by the following procedure. (1) The movable platen 20 is moved forward by the moving cylinder 2 toward the fixed platen 10. After the two molds 30a and 30b touch, the driving of the movable cylinder 2 is stopped, and the position of the movable platen 20 (the position of the movable mold) is detected by the position detection unit 73, and the origin setting unit 71 is set as a mold touch point. To set the origin (S ₀ ). Instead of detecting the position of the movable platen 20, it is also possible to detect a moving cylinder stroke and set the origin via the cylinder stroke. (2) At the same time, a predetermined mold opening amount setting value (S) is set by the mold opening amount setting unit 70 as a retreat amount of the movable platen 20 from the mold touch point (origin). When the origin is set by the moving cylinder stroke, the mold opening amount is set by the retractable moving cylinder stroke of the movable platen 20. (3) Based on the mold opening set value (S), the moving cylinder 2
Then, the movable platen 20 is moved backward (mold opening movement) to confirm that the set value (S) has been reached by the position detector 73 (position of the movable platen 20 or the moving cylinder stroke value), and then the driving of the moving cylinder 2 is stopped. Then, the initial setting of the mold clamping control in the mold opening amount setting is completed.

Next, the procedure for setting the mold clamping start signal shown in FIG. 3 will be described. This is set according to the following procedure. (1) Injection filling is performed based on a preset injection filling amount (a resin amount obtained by adding a cooling solidification shrinkage amount of the resin) and an injection pressure (one injection pressure value that can be filled).
In this way, an ideal natural filling flow (natural flow) is obtained in which the filling speed is high at the beginning of filling and the filling speed is naturally reduced as the filling proceeds. (2) The range in which the mold clamping start timing signal is detected is defined by the forward limit (point E) and forward limit (E) of the injection cylinder stroke.
The injection cylinder stroke position in the area near the injection filling completion up to the point (point) is set by the position setting unit 69 as a position set value (monitoring start point, P). By doing so, the filling behavior on the injection mechanism side and the mold cavity 2
8, the mutual relationship between the filling behaviors is detected most accurately, and the injection / mold clamping interlocking control in which the mold clamping operation is overlapped with the injection filling operation can be accurately controlled. At the same time, the comparison control unit 63 sets a timing signal of mold clamping start as a comparison set value (K value) at the injection speed on the injection mechanism side.
By setting the timing signal at the injection speed together with the injection filling operation by the injection pressure control, the filling behavior of the resin in the mold cavity 28 can be comprehensively grasped from the injection mechanism side. The timing signal can be detected stably and accurately without being affected by disturbance factors such as variations in the filling amount due to the fluctuation and fluctuations in the resin temperature during molding. (3) Control of mold clamping start (compression step start) based on the set values (P point, K value). When the injection cylinder stroke reaches the monitoring start point (P), the injection speed detector 6
In step 8, monitoring of the injection speed is started. Mold cavity 28
When the injection speed is naturally reduced by the injection filling operation by the injection pressure control along with the filling behavior of the resin in the inside, and when the detection signal of the injection speed detecting unit 68 is reduced to the K value (set speed reaching point, V), The mold clamping operation is started (compression step). (4) Simultaneous control of the mold clamping force and the injection pressure is performed simultaneously with the start of mold clamping (start of the injection / mold clamping interlocking section). By doing so, in the compression step by the mold clamping operation, backflow of the resin from inside the mold cavity 28 to the injection side can be prevented,
As a result, there is no deformation of the molded article due to the backflow, and no shut-off valve or the like for preventing backflow is required.
It should be noted that regarding the synchronous control, the nozzle 44 of the injection device 40
In order to keep the resin pressure balance between the inside and the mold cavity 28, taking into consideration the compression conditions (clamping speed and mold clamping pressure) due to mold clamping, the mold clamping side is prevented from retreating. And compression control on the injection side are performed simultaneously. That is, the injection pressure is increased at the same time as the start of the increase of the mold clamping force, so that the resin pressure in the mold cavity 28 and the injection pressure are made equal to prevent the resin from flowing backward.

Next, the molding procedure in the injection press molding method is sequentially performed according to the following procedure as shown in FIG. (1) The movable platen 20 is moved forward by the movable cylinder 2 toward the fixed platen 10 based on the mold opening amount setting value (S) previously set by the mold opening amount setting section 70. When the detection signal (movable platen position or moving cylinder stroke value) of the position detecting section 73 reaches a set value, the moving cylinder 2 is stopped. (2) The half-split nut opening / closing cylinder 26 is driven so that the half-split nut 22 and the screw or groove on the tie bar 7 are completely engaged and fixed. Here, both molds 30
Based on the mold thickness (die height value) of a and 30b and the pitch of the thread or groove, a motor previously connected by a chain is connected so that the half nut 22 and the thread or groove on the tie bar 7 are completely engaged. By rotating the sprocket, the amount of forward and backward movement of the adjusting shaft is adjusted. (3) The pressurizing oil is supplied to the mold clamping cylinder 3 to perform the mold clamping operation, and the mold clamping reference detecting unit 72 starts monitoring the detection of the contact between the half nut 22 and the movable platen 20. That is,
At the time when the half nut 22 and the screw or groove on the tie bar 7 are engaged and fixed, the half nut 22 and the movable platen 20 have a die height value and a screw or This is a state having a gap calculated from the pitch of the groove. Accordingly, the mold clamping operation in this case mainly includes the tie bar 7 and the half nut 22 meshed and fixed to the tie bar 7 while keeping the position of the movable platen 20 as it is.
Is shown to be slid forward so as to be pulled out toward the fixed platen 10 side.

(4) The contact between the half nut 22 and the movable platen 20 is detected by any of the following methods. Detects the gap between the half nut and the movable platen. Detects position fluctuations of the movable platen. The amount of change in the moving cylinder stroke value is detected. This method is the most reliable method because it is a direct detection. In addition, the method (1) is an indirect detection utilizing the fact that the movable platen 20 (or the movable cylinder 2) is united by the contact between the half nut 22 and the movable platen 20 to indicate a forward operation for mold clamping. But movable plate 20
(Or moving cylinder stroke) position detector 73
Since the sensor can be shared with the system, the system can be simplified. (5) After detecting the contact between the half nut 22 and the movable platen 20 by the mold clamping reference detecting section 72, the mold opening amount set value (movable plate position or moving cylinder stroke value, S
At the same time as controlling the hydraulic pressure of the mold clamping cylinder 3 so as to maintain the value (1), the injection filling process is started. (6) In the injection filling step, the position set value (P
Point) and the timing control of mold clamping start (compression step start) based on the comparison set value (K value). After the injection cylinder stroke reaches the point P, the injection speed detector 68 starts monitoring the injection speed. After detecting that the detection signal of the injection speed detection unit 68 has been reduced to the K value, the comparison control unit 63 transmits a mold clamping start signal to the mold clamping control unit 66 via the synchronization control unit 62 and a timer 64. Start. As a result, the synchronous control unit 62 performs synchronous control of the mold clamping pressure and the injection pressure, and performs injection press molding in conjunction with the injection and mold clamping.

(7) Here, the metering start time (t ₁ ) and the mold clamping completion time (t ₂ ) are set in the timer 64 in advance. After the mold clamping is started, the mold clamping side and the injection side are each controlled based on the timeout signal of the timer 64. Where t ₁
Is based on the gate sealing time. However, when a shut-off valve is incorporated, the shut-off valve closing operation completion time is used as a reference. In addition, t ₂ is calculated as the cooling and solidifying time of the resin from the resin temperature, the mold cooling capacity, the shape of the molded product, and the like, and is set as the holding pressure cooling time. (8) The comparison control unit 6 receives a time-out (t ₁ ) signal.
Reference numeral 3 transmits a weighing start signal to the injection control unit 61 to start a weighing operation. Similarly, the comparison control unit 63 transmits a compression completion signal to the mold clamping control unit 66 in response to the time-out (t ₂ ) signal, and performs product removal following the mold opening operation.
The next molding operation starts.

[0025]

As described above, the present invention can exhibit the following excellent effects. (1) During the injection filling step, the injection pressure is controlled so that the filling can be performed. In the initial stage of the filling, the filling speed is spontaneously reduced with the progress of the filling at a high speed, and has a continuous speed gradient. Since an ideal natural filling flow (natural flow) that does not generate pressure is automatically obtained, the operability of the injection filling control becomes extremely easy. (2) After detecting that the injection speed during the injection filling process has been reduced to the set value within the range near the completion of filling, the mold clamping is started and the compression process is performed to measure the measured value and check ring operation. Without being affected by disturbance factors such as variations in the filling amount due to fluctuations and fluctuations in resin temperature during molding,
Since the correlation between the filling behavior on the injection mechanism side and the filling behavior in the mold cavity can be accurately detected, and extremely high-precision injection press molding can be controlled, a high-quality molded product can be supplied stably. (3) In the compression step, by controlling the injection pressure and the mold clamping pressure synchronously, the backflow of the resin from the mold cavity to the injection side can be prevented. Cost can be reduced by eliminating the need for a shut-off valve. (4) The mold opening / closing operation of the mold is performed by a movable cylinder, and injection press molding is performed by using a molding machine that performs high-pressure mold clamping with a mold clamping cylinder connected to a tie bar. The holding control of the mold clamping is controlled by the hydraulic control of the small-capacity, short-stroke clamping cylinder, and the response delay due to the compression of the hydraulic oil is extremely small. It is possible to stably supply extremely high quality molded products. Furthermore, by controlling a plurality of mold clamping cylinders independently, it is possible to apply a compressing action while giving an arbitrary tilting, or leveling control to correct the tilt of the mold during the molding operation. Can perform an injection press molding machine having a wide range of applications.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing a procedure for setting initial conditions of mold-opening mold-clamping control according to the embodiment of the present invention.

FIG. 3 is a flowchart showing a procedure for setting a mold clamping start timing signal according to the embodiment of the present invention.

FIG. 4 is a flowchart showing a molding operation procedure of the injection press molding method according to the embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 mold clamping device 2 moving cylinder 3 mold clamping cylinder 4, 5 internal piston 7 tie bar 8 screw portion or groove portion 10 fixing plate 11 screw engagement adjusting device 20 movable plate 22 half nut 26 tie bar locking device (half nut opening / closing cylinder) 28 Cavity 30a Fixed mold 30b Movable mold 40 Injection device 41 Barrel 42 Screw 44 Nozzle 46 Injection cylinder 47 Forward / reverse rotation motor 48 Piston 50 Connecting plate 60 Control device 61 Injection control unit 62 Synchronous control unit 63 Comparison control unit 64 Timer 65 Hydraulic control valve 66 Mold clamping control unit 67 Hydraulic control valve 68 Injection speed detecting unit 68a, 68b Hydraulic supply source 69 Position setting unit 70 Mold opening setting unit 71 Origin setting unit 72 Mold clamping reference detecting unit 73 Position detecting unit 100 Injection press Forming device E Forward limit V Set speed reaching point P Monitor Grayed start point K Comparative set value S mold opening amount set value S ₀ mold touch point t ₁ the pressure-holding cooling time (compression completion time) t ₂ Weighing start time

Claims (4)

(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 fixed with a moving cylinder and a mold clamping cylinder connected to the tie bar.The movable cylinder moves the movable plate toward and away from the fixed platen, and the movable platen moves with the mold clamping cylinder. Using a mold clamping mechanism that applies a mold clamping force by pressing the board against the fixed board side, calculate the amount of cooling solidification shrinkage of the resin in advance, and fill the mold cavity with the amount of resin obtained by adding the amount of cooling solidification shrinkage. Injection filling with possible injection pressure control, and holding the mold at a predetermined mold opening position on the mold clamping mechanism side in advance, and the injection speed of the injection mechanism during the injection filling process was reduced to the set value. After detecting Starts the compression process the clamping force by the load, injection press molding method characterized by synchronously controlling the injection pressure of the clamping pressure and the injection mechanism of the mold clamping mechanism. 2. The injection according to claim 1, wherein the detection of the injection speed during the injection and filling step is performed at an injection cylinder stroke position in a region near the completion of injection and filling up to the forward limit of the injection cylinder stroke. Press molding method. 3. The movable platen is advanced by a moving cylinder in advance, and the position of the movable platen is set to an origin in a state where both molds touch each other, and the movable platen is moved backward by a moving cylinder at a predetermined mold opening position. After the movable platen is set by the retreat amount from the origin setting position, and the half nut is fitted and fixed to the screw portion or groove portion of the tie bar, the half nut and the movable plate come into contact with the mold clamping cylinder. 3. The hydraulic pressure of the mold clamping cylinder according to claim 1 or 2, wherein the mold is clamped until the movable nut comes into contact with the half nut, and the hydraulic pressure of the mold clamping cylinder is controlled so as to hold the movable mold at the set retreat position. Injection press molding method. 4. A fixed plate, a movable plate and a connecting plate are arranged in the axial direction of the 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 fixed with a moving cylinder and a mold clamping cylinder connected to the tie bar.The movable cylinder moves the movable plate toward and away from the fixed platen, and the movable platen moves with the mold clamping cylinder. Equipped with an injection control unit that controls injection filling using a mold clamping mechanism that applies a mold clamping force by pressing the plate to the fixed platen side, a mold opening amount setting unit, and a position detection unit that detects the position of the movable platen An origin setting unit for setting the origin of the movable plate in a state where both molds are touched, a mold clamping reference detecting unit for detecting contact between the half nut of the mold clamping mechanism and the movable plate, and The set value of the quantity setting unit, the position detection unit and the mold clamping standard A mold clamping control unit that controls a mold clamping operation by comparing the detection signal with a detection signal of the detecting unit, and an injection speed detecting unit that detects an injection speed during an injection filling process, and a position that sets a detection range of the injection speed. A setting unit, a comparison control unit that transmits a mold clamping start signal to the mold clamping control unit based on a detection signal transmitted from the injection speed detection unit,
An injection press molding apparatus, comprising: a synchronous control section that synchronously controls a mold clamping pressure and an injection pressure after the start of mold clamping.