JP2582355Y2 - Injection molding machine - Google Patents

Description

[Detailed description of the invention]

[0001]

INVENTION The present invention relates to a formed shape material, Gore <br/> arm member For example, an injection molding machine for controlling the rubber material loading in the injection molding.

[0002]

As BACKGROUND ART Injection molding material, for example, as an injection molding machine and injecting a rubber material from the nozzle into the injection mold to mold the product of a predetermined shape, and various injection molding machine is known from the prior art I have. In the injection molding of these rubber materials, pressed into an injection mold the rubber material in a molten state through a nozzle using a scan Cru extruder. And
Conventionally, as extrusion control of a screw type extruder, sequence control in which the injection time is fixed using a sequencer that performs logical sequence control or sequence control in which the injection switching position is fixed is performed. .

[0003]

An invention is, however, the fixed sequence control constant injection time in the injection molding of the conventional rubber material, or an injection switching position in a fixed sequence control constant viscosity for each shot of the molding material since there are <br/> variation, not the amount of filling variations in the injection speed is generated is constant, filling shortage or, etc. burrs, there is a problem that the quality of the injection molding of the rubber material is reduced ing.
Also, with other conventional injection control devices , the molding material of the injection molding machine
It is difficult to perform an optimal control method as an operation taking into account the viscosity of the material, etc. , the control speed is slow , and the control time
However, there is a problem that it is difficult to correct the variation, and the filling amount of the rubber material is not constant.

[0004]

A drive unit (10) and a drive unit (10) are provided.
Is moved by the drive of the moving device (10) to form the molding material.
Pressing mechanism having pressing members (3, 6) for injection into the mold
(2, 3, 5, 6) and the pressing mechanism (2, 3, 5, 6)
Detecting a plurality of set positions where the pressing members (3, 6) move
Detector (8) for transmitting a position detection signal (S1)
And each position detection signal (S) transmitted from the position detector (8).
The reference position (1 / 4S2, 1 / 2S2) of 1) is set.
And set position signals (S31a, S31b)
Reference position setting means (31) for transmitting, and reference position setting means
Set position signal (S31a, S31b) from stage (31)
And a position detection signal (S1) from the position detector (8).
To calculate the injection time travel time (T2)
From the movement time (T2) to the injection pressure switching signal of the injection process.
The time of the signal (S20) is determined and the driving means (10) is determined.
And an injection control device (20) for outputting.

According to a second aspect of the present invention, there is provided an injection molding apparatus.
The operation of the drive unit (10) is performed by the control unit (20) based on the filling time.
Operation delay time (T3) that can discount the operation delay time (T3)
The operation delay time setting device (32) in which
Things.

According to a third aspect of the present invention, there is provided an injection molding machine comprising:
The material uses a rubber material.

[0007]

[Function] Injection control provided in the injection molding machine of the present invention
Each shot of the pressing member (3, 6) is provided in the device (20).
Reference position setting means (31) for determining the filling process and the position
Since the detector (8) is connected, the
Even if the viscosity of the molding material changes, the filling process is determined according to the viscosity.
I can be determined. As a result, always a certain amount of filled molding
Articles can be molded. Also, the drive means (10)
If a delay time (T3) occurs, this operation and
Refill time (T3) discounted from travel time (T2)
It is designed so that the process can be determined. Because of this, filling
Improve accuracy and shorten filling process time
Becomes possible. Furthermore, when the molding material is a rubber material,
The filling amount changes with the viscosity of the rubber material.
The relationship between the injection speed and viscosity accompanying (T ₂ ) is the injection pressure
If the viscosity is high, the injection speed will be slow if the viscosity is high
In addition, there is a proportional relation that injection speed increases when viscosity is low.
is there. Therefore, by measuring the travel time (T2),
The filling amount in the filling step can be made constant.

[0008]

DETAILED DESCRIPTION FIG. 1 is a configuration view of an injection molding machine using a rubber material as an embodiment of the present invention. The rubber material for the injection molding machine, an injection mold 1, the heating cylinder 2, the screw extruder 3 which moves up and down to illustrate this heating cylinder, a piston 6 that moves the screw extruder 3, the injection cylinder 5 which houses the piston 6, hydraulic device 10 for moving the piston 6, and a high-speed injection control apparatus 20 for driving and controlling the hydraulic system. Further, the injection molding machine sends the injection completion set position signal S to the high-speed injection control device 20.
A reference injection completion position setting device 31 for outputting the output 31, a hydraulic operation delay time setting device 32 for outputting the hydraulic operation delay time set value S 32 to the high-speed injection control device 20, and the position of the piston 6 in the injection cylinder 5 are detected. And a position detector 8 which is a linear sensor composed of a scale and a position detecting member 7 directly connected to a piston 6 for outputting a position detecting analog signal S1.

The hydraulic device 10 is an example of the above-mentioned hydraulic drive device. The heating cylinder 2, the screw type extruder 3, the injection cylinder 5, and the piston 6 correspond to the pressing mechanism, and the screw type extruder 3 and / or the piston 6 correspond to the pressing member. The reference injection completion position setting device 31 corresponds to the reference position setting device, and the hydraulic operation delay time setting device 32 corresponds to the time setting device. Position detector 8 corresponds to the position detector 8, speed injection controller 20 corresponds to the injection control unit 20.

[0010] The position detector 8 of the injection outputs an analog position detection signal S1. The piston 6 is moved up and down in the injection cylinder 5 by the hydraulic device 10 between the upper limit position “0” and the lower limit position S2. As the piston 6 moves, the screw type extruder 3 directly connected to the piston 6 moves in the heating cylinder 2. Therefore, the injection position detector 8 detects the position of the screw type extruder 3. Molding
Since the material viscosity during production changes every shot, the injection mold to the screw extruder 3 Therefore the nozzle 4 1
Press-fitting condition of the rubber material to be press-fitted is changed to. others
Because, the switching position point, in this example, the above upper limit position "0" to the lower limit position: S2 1/4 lowered position range of: 1 / 4S2 and 1/2 lowered position: set to 1 / 2S2
Specified. The hydraulic device 10 has a variable relief 11, a hydraulic valve 12, and a variable displacement pump 13, and drives the piston 6 in response to an injection pressure switching signal S20 from the high-speed injection control device 20.

An outline of the control operation of the injection molding machine will be described. First, the lower limit position: S2, which is the reference injection completion position of the piston 6 in the injection cylinder 5, is set in the high-speed injection control device 20. Further, the actual operation delay time T3 of the hydraulic pressure of the hydraulic device 10 or the like is set in the hydraulic operation delay time setting unit 32. Further, the piston 6 at the reference injection completion position setter 31
Is 1/4 descent position: 1/4 descent position from 1 / 4S2 : 1
/ 2 Measure the time T1 to reach S2 (this
Is to measure the section where the injection speed is constant.
) . Further , the piston 6 is moved downward by a 1/2 position: 1 / 2S
T2 is the time from the time when it reaches 2 to the time when the injection is completed.
= T1x2. And the piston 6 is halved
Lowering position: After moving to 1 / 2S2 with the press-fit pressure, the time for switching to the holding pressure is determined as (T2-T3) in consideration of the hydraulic operation delay time T3. The high-speed injection control device 20 determines the time for each shot (T2 or T2-T3).
A control operation due to perform. That is, the high-speed injection control device 20
Is an analog position detection signal S1 detected by the position detector 8.
As well as receive, from the reference injection completion position setter 31
Is the injection completion set position signal S3 of the set digital value.
Receive one, receive the hydraulic operation delay time set value S32 in the digital value set from the hydraulic lag time setter 32
Shin and treated, transmits an injection pressure switching signal S20 for controlling the hydraulic system 10. The hydraulic device 10 drives the piston 6 in response to the injection pressure switching signal S20. The piston 6 drives the screw type extruder 3 by injection pressure by driving the hydraulic device 10.
The screw type extruder 3 is moved by the force switching signal 20 for a time, and the molten rubber material (not shown) is injected into the injection molding die 1.
Pressed into the screw extruder 3 holds the pressurized state to the injection mold 1, a rubber material which has been pressed is injection molded is cooling in the injection mold 1. The screw type extruder 3 is returned via the piston 6 and the injection molding die 1
The rubber injection molded product molded in the inside is taken out from the injection mold 1. In production, the extrusion of the injection mold 1 of rubber material on the following injection molding, the operation is taken out from the injection mold 1 of an injection molded article are repeated.

FIG. 2 shows the high-speed injection control device 20 shown in FIG.
3 shows a detailed circuit configuration. The high-speed injection control device 20
D converter 21, a first comparator 22, second comparator 23, up-down counter 24, and a third comparator 25, the AND gate 26 and the clock generator 27,. As is clear from this circuit configuration, the high-speed injection control device 20 is configured as a digital signal processing circuit.

The A / D converter 21 converts an analog position detection signal S1 from the position detector 8 into a digital position signal S21 for digital signal processing in a subsequent circuit. The reference injection completion position setting device 31 outputs a first reference injection completion setting position signal S31a and a second reference injection completion setting position signal S31b as the injection completion setting position signal S31. The value of the first reference injection completion set position signal S31a is a digital value corresponding to the 1/2 lower position: 1 / 2S2 of the piston 6 or the screw type extruder 3. The value of the second reference injection completion set position signal S31b is a digital value corresponding to the 1/4 descending position: 1 / 4S2 . In this example, the 1/4 descending position: 1 / 4S2 and the 1/2 descending position: 1 / 2S2 are used for detecting the timing time T2 at which the above-mentioned press-fitting state is shifted to the pressure holding state. In this case, injection
The process time becomes T1 × 2.

A first comparator 22 is a first reference injection which indicates a digital position signal S21 from the A / D converter 21 and a digital 1/2 lowering position: 1 / 2S2 from the reference injection completion position setting unit 31. Comparing with the completion set position signal S31a, when the position signal S21 is larger than the 1/2 lowering position: 1 / 2S2 , the first of the "high" level
Is output to the count input terminal C of the up / down counter 24 and the AND gate 26. The second comparator 23 includes a position signal S21 from the A / D converter 21 and a second reference injection completion setting position signal S31b indicating a 1/4 descending position: 1 / 4S2 from the reference injection completion position setting device 31. Is high when the position signal S21 is larger than the 1/4 descending position: 1 / 4S2.
The level second position comparison signal S23 is output to the reset terminal R of the up / down counter 24. The up / down counter 24 is reset by the second position comparison signal S23, and increases (ups) or decreases (downs) the count value in response to the first position comparison signal S22.
Up-down counter 24 measures the time T2 described above when counting up, when down counting is operated in order to detect the operation delay time T3.

The value counted by the up / down counter 24 corresponds to the above-mentioned time difference (T2−T3) and is output to the third comparator 25 as an up / down count value C1, and is set by the hydraulic operation delay time setting unit 32. Is compared with the set digital hydraulic operation delay time set value C2. When the up / down count value C1 is smaller than the hydraulic operation delay time set value C2, the third comparator 25 outputs the "high" level count comparison result signal S25 to the AND gate 2
6 is output. The AND gate 26 outputs a logical product (AND) of the first position comparison signal S22 and the count comparison result signal S25.
D), the "high" level first position comparison signal S2
2, that is, the position detection signal S1 (S21) is larger than the 1/2 descending position: 1 / 2S2 , and the "high" level count comparison result signal S25, that is, the up / down count value C1, is the hydraulic operation delay time. When the value is smaller than the set value C2, an “high” level injection pressure switching signal S20 is output to the hydraulic device 10. The clock generator 27 is a clock necessary for the operation of the signal processing circuit, in this example, 10 clocks.
and outputs the kH _Z and 5kH _Z. 10kHz _Z is up
Is used to up-count in the down counter 24, 5kH _Z is used to down-count in the up-down counter 24.

FIG. 3 shows the high-speed injection control device 2 shown in FIG.
0 shows a more detailed circuit configuration of the reference injection completion position setting device 31 and the hydraulic operation delay time setting device 32. However, in FIG. 3, the reference injection completion position setting device 31 is shown as a reference injection completion position setting device 33. The reference injection completion position setting device 33 (or 31) outputs 12-bit reference position signals x1 to x12. Each bit is optically coupled to a light emitting diode (LED) connected in series with the resistor, as indicated by reference numeral 33A or 33B, and a voltage is applied to the emitter via the resistor, and the setting signal is output. It consists of an output phototransistor. For example, an LED on the primary side is turned on by a reference position signal set by an operator operating a switch, and the lighting turns on the phototransistor, thereby outputting "low" level reference position setting signals x1 to x12. The hydraulic operation delay time setting device 32 is constituted by an 8-digit DIP switch set by an operator. An 8-bit hydraulic operation delay time set value C2 is output from the hydraulic operation delay time setter 32.

The A / D converter 21 shown in FIG. 2 includes a voltage conversion buffer circuit 211 and an A / D converter integrated circuit (I / D converter).
C) (model: ADC80AG-12) 212. The voltage conversion buffer circuit 211 includes the position detector 8
Converts the analog position detection signal S1 into a voltage, and also functions as a buffer circuit. A / D converter IC21
Reference numeral 2 denotes a 12-bit A / D conversion integrated circuit, and the position detection signal S converted to a voltage by the voltage conversion buffer circuit 211.
1 is converted into a 12-bit digital position signal S21. The first comparator 22 has 4 bits of 3 bits each.
Pieces of magnitude comparator IC (model: 74HC)
85) A / D converter I which includes 221 to 223
12-bit digital position signal S21 from C212
And compares it with the reference position setting signals x1 to x12 from the reference injection completion position setting device 33. The second comparator 23 includes three magnitude comparator ICs (model: 74HC85) 231 to 233 each having 4 bits.
And inputs the 12-bit digital position signal S21 from the A / D converter IC 212, and outputs the reference position setting signals x1 to x1 from the reference injection completion position setting device 33.
Compare with 2.

The up / down counter 24 includes four 4-bit binary up / down counter ICs (model:
74HC191) 241-244, and 0-65
High-speed counting is possible in the range of 536. The lower 8 bits are output from the up / down counter ICs 241 to 244 to the third comparator 25 as the up / down count value C1 corresponding to the 8-bit hydraulic operation delay time set value C2. The third comparator 25 includes two magnitude comparator ICs each having 4 bits (model: 7).
4HC85) 251 to 252, and compares the up / down count value C1 from the up / down counter ICs 241 to 242 with the hydraulic operation delay time set value C2 from the hydraulic operation delay time setter 322. AND gate 2
6 is provided with a photocoupler 28 in which an LED and a phototransistor are photocoupled. The photocoupler 28 outputs an injection pressure switching signal S20.
Is output to the hydraulic device 10.

The clock generator 27 shown in FIG. 2, the Schmitt inverter IC (model for outputting an oscillation frequency signal of 10KH _Z as reference oscillation frequency f1: 74HC1
4) 273, D that divides reference oscillation frequency f1 by half
Type flip-flop (model: 74HC74) 275, reference oscillation frequency f from Schmitt inverter IC 273
A multiplexer (model: 74HC153) 276 for selectively outputting the divided frequency f2 divided by 1/2 by the 1 or D-type flip-flop 275 and a capacitor 27 provided around the Schmitt inverter IC 273
1, a resistor 272 and a capacitor 274. Since the reference oscillation frequency f1 is 10KH _Z, divided frequency is 1/2 frequency-divided in the D-type flip-flop 275 f2 is 5kH _Z. The reference oscillation frequency f1 and the division frequency f2 are selectively output by the multiplexer 276 and used for counting in the up / down counter 24.

The first position comparison signal S22 output from the first comparator 22 is used as an up / down counter IC.
241 to 244 are applied to the down / up terminals D / U and the AND gate 26. Second comparator IC2
Second position comparison signal S23 output from 31 to 233
Is applied to the inverting load terminal LD ₋ ( ₋ indicates inversion) corresponding to the reset terminal R shown in FIG. 2 to reset the up / down counter ICs 241 to 244. After being reset by the second position comparison signal S23, the up / down counter ICs 241 to 244 change the clock applied to the clock terminal (not shown) to the logic state of the first position comparison signal S22, that is, "high". A down-counting operation or an up-counting operation defined by the “level” or the “low” level is performed. The lower two count values of the up / down counter ICs 241 to 244 are used as an up / down count value C1 as an inversion enable terminal ENA.
_-Output from

The control operation of the injection molding machine shown in FIGS. 1 and 2 will be described with reference to FIG. FIG. 4 is a flowchart showing the operation of the control system of the injection molding machine. Before the high-speed injection control device 20 operates, the operator sets the following conditions. Step S01: The operator sets the injection completion set position signal S3 to the reference injection completed position setter 31 (33).
1, that is, the above-mentioned 1/2 lowering position: 1 / 2S2 and 1/4 lowering position: 1 / 4S2 are set. The reference injection completion position setting device 31 outputs a first digital reference injection completion setting position signal S31a and a second digital reference injection completion setting position signal S31b indicating the above values. Step S02: The operator sets the hydraulic operation delay time set value C2 (the hydraulic operation delay time set value S32) in the hydraulic operation delay time setter 32. When the above setting operation by the operator is completed, the high-speed injection control device 20 operates. Thereby, the hydraulic device 10 operates and the initial position,
The piston 6 at the upper limit position “0” is lowered toward the lower limit position: S 2, the screw type extruder 3 linked with the piston 6 is pushed down, and the molten rubber material is injected through the nozzle 4 into the injection molding die 1. Press-fit.

Steps S03 and S04: The A / D converter 21 outputs the analog position detection signal S1 from the position detector 8.
Is input (step S03) and converted into a 12-bit digital position signal S21 (step S04). As shown in FIG. 3, the conversion of the analog position detection signal S1 into the digital position signal S21 is performed by the first comparator ICs 221 to 223 and the second comparator ICs 231 to 233 which are digital signal processing circuits. This is to enable processing. Step S05: the digital position signal S21 (or S1) indicating the lowered position of the piston 6 is compared with a first reference injection completion setting position signal S31 b is applied to the second comparator 23. Since the first reference injection completion set position signal S31a is at the 1/4 descending position: 1 / 4S2 , the second comparator 23 sets the upper limit position at which the piston 6 (or the screw type extruder 3) is the initial position. 1 down from "0"
/ 4 descent position: It is determined whether or not 1/4 S2 has been reached. Step S06: When the piston 6 has not yet moved down to the 1/4 lower position: 1 / 4S2 , the second comparator 23 outputs the second position comparison signal S23 in a logical state indicating that the up / down counter 24 is reset. Output.

Steps S07 and S08: The first comparator 22 compares the digital position signal S21 (or S1) with the second reference injection completion set position signal S31b indicating the 1/2 lowered position: 1 / 2S2 . . In the second comparator 23, a digital position signal S21 is piston <br/> tons 6 1/4 lowered position: 1 / 4S2 to indicate that lowered is detected than, and first comparator 2
2, when the digital position signal S21 is detected to be smaller than the 1/2 descending position: 1 / 2S2 , the second position comparison signal S23 outputs a logical signal indicating a reset release state to the reset terminal R of the up / down counter 24. output, the first comparator 22 outputs the first position comparison signal S22 which counts up in the up-count clock 10KH _Z in the up-down counter 24. That is, the piston 6 is moved down to the 1/4 lower position: 1/4 from 1 / 4S2.
2 lowered position: When you are lowered between 1 / 2S2, up-down counter 24 is up-counted by the clock 10KH _Z, measured therebetween of the falling time T2.

Steps S07 and S09: The second comparator 23 detects that the digital position signal S21 indicates that the piston 6 has fallen below the 1/4 descent position: 1/4 S2 , and the first comparator 23 22
At the point where the digital position signal S21 is at the 1/2 descending position:
When it detects greater than 1 / 2S2, the second position comparison signal S23 outputs a logic signal indicating the reset release state to the reset terminal R of the up-down counter 24, the first comparator 22 is down 5KH _Z Up / down counter 2 counts first position comparison signal S22 to be counted.
4 is output. That is, the piston 6 is moved down by a quarter.
Passes through the 1 / 4S2, 1/2 lowered position: When passing through the 1 / 2S2, up-down counter 24 is a clock 5
down counting with kH _Z, measures a time difference T2-T3. Step S10: The third comparator 25 calculates the up / down count value C1, which is the down count value from the up / down counter 24, that is, the time difference (T2-
T3) is compared with the hydraulic operation delay time setting value C2 set by the hydraulic operation delay time setting device 32. If the up / down count value C1 is smaller than the hydraulic operation delay time setting value C2, the "high" level is set. Of the count comparison result signal S25 of A
Output to the ND gate 26.

Therefore, the "low" level injection pressure switching signal S20 is output from the AND gate 26 to the hydraulic device 10 in the initial state of the injection molding machine, and the piston 6
Is lowered by passing through 1 / 2S2 , and when the up / down count value C1 becomes smaller than the hydraulic operation delay time set value C2, the "high" level injection pressure switching signal S20 is sent to the hydraulic system. Output to 10

To summarize the control operation of the injection molding machine described above, the hydraulic device 10 injects the rubber material in the initial state when the "low" level injection pressure switching signal S20 is applied from the high speed injection control device 20. and the piston 6 is lowered by the pressure of injecting the molding die 1, to lower the screw extruder 3 in conjunction with the piston 6. Therefore, the rubber material in the melted state is press-fitted into the injection molding die 1 at the above-mentioned press-fitting pressure. Then, the piston 6 is moved down by １ ／.
/ 2S2 , then up / down count value C1
When the time during which the pressure becomes smaller than the hydraulic operation delay time set value C2 elapses, that is, when the operation delay time of the hydraulic system elapses, the screw type extruder 3 is maintained at the dwell pressure through the piston 6 to maintain the dwell state. Is done.

The operator operates the hydraulic operation delay time setting device 32
, The operation delay time T3 is set. This time T3
It can be set to arbitrary based on the actual operating conditions, such as hydraulic system 10. Similarly, the values of the first reference injection completion setting position signal S31a and the second reference injection completion setting position signal S31b set by the reference injection completion position setting device 31 are the same as those of the above-mentioned 1/4 descent position: 1 / 4S2 and 1/2 descending position: Not limited to 1 / 2S2 , the operator can set any position defined by the adjustment result of the injection molding machine. As a result, the rubber material is injection-molded under optimum operating conditions according to the actual operating conditions of the injection molding machine in consideration of the hydraulic operation delay time and the like and the viscosity of the rubber material.

According to the configuration of the high-speed injection control device 20 illustrated in FIG. 2 and FIG.
A very high-speed injection operation of about 0 ms can be sufficiently followed.
In addition, signal processing is performed by digital circuits.
Hardly affected by noise, etc.
The hydraulic device 10, the piston 6, and the screw-type extruder 3 can be operated.

FIGS. 2 and 2 show a high-speed injection control device 20.
An example using a logic circuit device configured as an IC chip has been shown as a preferred circuit configuration example, but the high-speed injection control device 20 is not limited to the circuit configurations shown in FIGS. 2 and 3.
Other circuit configurations are possible. For example, the high-speed injection control device 20 can be configured using a microcomputer. In this case, the first comparator 22, the second comparator 23, the up / down counter 24, the third comparator 25, and A shown in FIG.
The ND gate 26 is realized by a microcomputer and a program loaded in the microcomputer. A /
The D converter 21 uses the same circuit as that shown in FIG. In the microcomputer, the first comparator 22, second comparator 23, third comparator 25 is treated as a normal comparison processing, up-down counter 24 is counted interrupt processing clock signal 10KH _Z or 5KH _Z This can be achieved by performing

The reference position set by the reference injection completion position setting unit 31 is not limited to two as described above, and the pressure of the hydraulic device 10 may be finely controlled at three or more positions. it can. In the above implementation,
Combining the first reference injection completion set position signal S31a, the second reference injection completion set position signal S31b, and the hydraulic operation delay time set value C2 (hydraulic operation delay time set value S32), the pressure switching timing of the hydraulic device 10 was to determine the, such as a hydraulic operation delay time T ₃ is negligible
In this case, the operation can be performed only at the lowered position of the piston 6.

In the above embodiment, the case where a rubber material is used as an object to be injection-molded has been exemplified. Applicable.

[0032]

[Effects of the Invention] The injection molding machine of the present invention has a position detector and a base.
Injection control means connected to the sub-position setting means performs the filling process.
At the time of injection, which is the requirement of the injection speed for one section of the stroke
Between the two, and from this time, the
Always constant regardless of molding conditions that change from page to page
To effectively prevent defective molded products
It stops. Furthermore, the injection speed time for this section
When switching the injection pressure in the injection process to measure the filling amount from
Ensure responsiveness of point and injection speed to molding conditions
It is expected that high-speed molding can be controlled. Especially,
Even if an operation delay time occurs during injection of a drive device, etc.
The operation delay time of the
Shape and effectively prevent defective molding.
You. In addition, if the molding material is rubber,
The molding conditions vary depending on the injection speed.
To determine the injection pressure switching time point from the time of
The effect of molding good products by always allowing proper filling is expected
it can.

[Brief description of the drawings]

FIG. 1 is a diagram showing an entire configuration of a control system of an injection molding machine of the present invention.

FIG. 2 is a diagram showing a circuit configuration of the high-speed injection control device shown in FIG.

FIG. 3 is a detailed circuit configuration diagram of the high-speed injection control device shown in FIG.

FIG. 4 is a flowchart illustrating a control operation of the injection molding machine shown in FIG.

[Explanation of symbols]

1. Mold for injection molding 2. Heating cylinder 3. Screw type extruder 4. Nozzle 5. Injection cylinder 6. Piston 8. Position detector (linear sensor) 10. Hydraulic device 11.・ Variable relief 12 ・ ・ Hydraulic valve 13 ・ ・ Variable displacement pump 20 ・ ・ High speed injection controller 21 ・ ・ A / D converter 22 ・ ・ First comparator 23 ・ ・ Second comparator 24 ・ ・ Up / down counter 25 ··· Third comparator 26 ··· AND gate 27 ··· Clock generator 31 ··· Reference injection completion position setting device 32 ··· Hydraulic operation delay time setting device 211 ··· Voltage conversion buffer circuit 212 ··· A / D converter IC 221 to 223 first comparator ICs 231 to 233 second comparator ICs 241 to 243 up / down counter IC 51-252... Third comparator IC 271... Capacitor 272... Resistor 273... Schmitt inverter IC 274... Capacitor 275... D-type flip-flop 276. Multiplexer S1. Analog position detection signal S20. Injection pressure switching signal S21 Digital position signal S22 First position comparison signal S23 Second position comparison signal C1 Up / down count value S25 Count count result signal C2 Oil pressure operation delay time Set value S31 Injection complete measurement position signal S31a First reference injection complete set position signal S31b Second reference injection complete set position signal S32 Hydraulic operation delay time set value S2 Lower limit position S2 / 4... 1/4 drop position S2 / 2... 1/2 drop position f1... Reference oscillation frequency f2. frequency

Claims (3)

(57) [Scope of request for utility model registration] A drive device (10) and said drive device (1)
It is moved by the drive of 0) and the molding material is injected into the mold.
Pressing mechanism (2, 3,...) Having pressing members (3, 6)
5, 6) and a pressing portion of the pressing mechanism (2, 3, 5, 6)
Detects and sets multiple set positions where the material (3, 6) moves
A position detector (8) for transmitting a detection signal (S1);
Each position detection signal (S1) transmitted from the position detector (8)
Reference positions (1 / 4S2, 1 / 2S2) are set
And sends the set position signal (S31a, S31b)
A reference position setting means (31) for performing
The set position signal (S31a, S31) from the stage (31)
b) and the position detection signal from the position detector (8)
(S1) is compared and the injection speed travel time (T2)
From the travel time (T2)
Of the injection pressure switching signal (S20) of
An injection control device (20) for outputting to the driving means (10).
An injection molding machine characterized by having. 2. The injection control device according to claim 1 , wherein
From the operation delay time (T3) of the driving device (10)
Operation delay with the operation delay time (T3) settable
The injection molding machine according to claim 1, characterized in that a time setting device (32) is connected . 3. The method according to claim 2, wherein the molding material is a rubber material.
The injection molding machine according to claim 1 or 2, wherein