JP2002172660A - Taking-out control method for molded article taking-out machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a taking-out control method for a molded article taking-out machine capable of increasing the sped of a molding cycle by shortening the entry time of a chuck part into the space between molds by minimizing the difference between the arrival time of the chuck part at a holding position and the completion time of ejection operation. SOLUTION: The molded article taking-out machine outputs an ejection start signal to a molding machine, when starts the chuck part to move on the basis of the mold opening completion signal from the molding machine to control the movement of the chuck part to the holding position between opened molds, to operate an ejector mechanism to eject and release the molded article held in the molds to take out the same. The output timing of the injection start signal is set so that the timing allowing the chuck part to arrive at the holding position coincides with the input timing of the ejection completion signal inputted from the molding machine at the time of the completion of the ejection of the molded article by the ejector mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the removal of a molded product removal machine, and more particularly to a method for setting an output timing of an ejector start signal to be output to a molding machine.

[0002]

In a molding machine equipped with a molded product unloading machine, the molding cycle is shortened by minimizing the entry time of the chuck portion between the opened molds, thereby achieving efficient molding. Making it possible.

[0003] In the conventional molded product unloading machine, a chuck portion for holding the molded product enters between the opened molds from a standby position above the mold, and a predetermined portion is formed on the molded product held in the mold. The ejector start signal is output to the molding machine to drive the ejector mechanism of the molding machine before reaching the opposing holding position at an interval of, and the timing of the completion of the ejecting operation by the ejector pin and the chuck portion reach the holding position. The output timing of the ejector start signal is set so that the timing substantially coincides with the timing.

[0004] However, in the molding machine, the ejector operation time required from the ejector start signal to the completion of the ejector operation is related to the temperature change of the hydraulic oil of the hydraulic cylinder and the lubricating oil of the ejector pin in the ejector mechanism, the degree of mechanical friction, and the like. Therefore, the ejector completion signal is input from the molding machine before or after the chuck portion reaches the holding position, and the ejector completion signal is input.

For this reason, a time loss occurs between the timing when the chuck section reaches the holding position and the timing when the ejector completion signal is output, which is an obstacle to shortening the molding operation time. In particular, in a large-sized molding machine, the actual operation time of the ejector mechanism tends to greatly change.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and its object is to solve the problem of the time required for the chuck portion to reach the holding position and the time required for completing the ejector operation. An object of the present invention is to provide a removal control method for a molded product removal machine capable of minimizing a time difference, shortening a time for entering a chuck portion between dies, and speeding up a molding cycle.

[0007]

According to the present invention, there is provided a molded product take-out apparatus which starts moving a chuck portion based on a mold opening completion signal from a molding machine and controls movement to a holding position between the opened molds. Then, an ejector start signal is output to the molding machine, and the ejector mechanism is operated to eject the molded product held in the mold and release the molded product to take out the molded product. The output timing of the ejector start signal is set so that the timing at which the chuck section reaches the holding position coincides with the input timing of the ejector completion signal input from the molding machine when the ejection of the molded product by the ejector mechanism is completed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a main body frame 3 of a molding machine 1 is shown.
Are provided with a movable side mounting plate 5 and a fixed side mounting plate 7 facing each other at a predetermined interval, and a tie bar 9 is horizontally mounted on the movable side mounting plate 5 and the fixed side mounting plate 7. A movable platen 11 is supported on the tie bar 9 so as to be slidable in the axial direction, and a movable mold 13 is mounted on a surface of the movable platen 11 facing the fixed side mounting plate 7. The movable platen 11 is connected to a mold clamping member 15 such as a hydraulic cylinder or an electric motor provided on the main body frame 3, and the movable mold 13 is fixed to the fixed-side mounting plate 7 by the mold clamping member 15. Mold 1
7. Make the mold clamp.

An injection device 19 is mounted on the fixed-side mounting plate 7 side of the main body frame 3 and is formed between the movable mold 13 and the fixed mold 17 clamped via the fixed mold 17. The molten synthetic resin is injected into a molding space (not shown) to form a molded product.

The movable platen 11 is provided with a known ejector mechanism. The ejector mechanism protrudes an ejector pin (not shown) mounted on the movable mold 13 by an ejector driving member (not shown) such as a hydraulic cylinder or an electric motor, and removes the molded product 25 held in the movable mold 13. Protrude and release.

On the upper side of the fixed-side mounting plate 7, there is provided a molded product removal machine 2.
7 base frame 29 base is fixed. The main body frame 29 extends in the left-right direction orthogonal to the axis of the injection device 19, and the traveling body 31 is supported on the main body frame 29 so as to be movable in the left-right direction.

The traveling body 31 is provided with a front-rear frame 33 extending in the front-rear direction coinciding with the axis of the injection device 19, and the front-rear frame 33 supports a front-rear traveling body 35 movably in the front-rear direction. An upper and lower frame 37 is supported on the front and rear traveling body 35 so as to be movable in the vertical direction, and a known chuck portion 39 for holding the molded product 25 is attached to a lower portion of the upper and lower frame 37.

The movement of the running body 31, the front and rear running body 35, and the upper and lower frames 37 is controlled by numerically controlled first to third servo motors 41, 43, and 45, respectively. These first to third servomotors 41, 43, and 45 have position detecting members 47, 49, such as a rotary encoder, for example.
51 are provided, and each of the position detecting members 47, 49, and 51 is provided.
The movement of the chuck section 39 is numerically controlled in a closed loop on the basis of the position detection signal from.

Although the above-described molded product take-out machine 27 is configured to move the chuck portion 39 three-dimensionally in the left-right direction, the front-rear direction, and the up-down direction, the chuck portion 39 may be moved from the left-right direction, the front-rear direction, or any of these directions. The present invention is not limited by the type of movement of the chuck portion, and may be any type of taking out a molded product by swiveling.

In FIG. 2, a memory unit 55 such as an HDD or a ROM is connected to a CPU 53 of a control device of the molded article unloading machine 27, and the memory unit 55 stores various program data for executing an unloading operation described later. . The RAM 57 outputs the output timing data T of the ejector start signal (T0 denotes the output timing data of the ejector start signal at the beginning of the ejection and Tex denotes the output timing data at the time of the previous ejection operation), and is output from the molding machine 1 at the end of the ejector operation. The output timing of the ejector completion signal and the delay time data (-) t1 or the advance time data (+) t1 ｛(-) t1 until the chuck section 39 reaches the predetermined holding position are stored in the chuck section after the input of the ejector completion signal. The symbol (+) t1 indicates a delay time until the ejector completion signal is input after the chuck unit 39 reaches the holding position. ｝
Is stored.

The RAM 57 includes a first timer area 57a for measuring the time until the ejector start signal is output when the chuck section 39 moves from the standby position to the holding position, and a RAM for measuring the delay time or the advance time. It has a second timer area 57b.

The CPU 53 receives a mold opening completion signal output at the end of the molding operation by the molding machine 1 through an interface 59.
The molded product removal machine 27 starts the removal operation based on the molding end signal. Also, an ejector completion signal output from the ejector driving member of the molding machine 1 is input via the interface 59. As a specific example of the ejector completion signal, the ejector drive member is constituted by a hydraulic cylinder, a sensor (not shown) is attached to a rod extension limit position in the hydraulic cylinder, and the ejector completion signal is detected by detecting the rod extended to the maximum position. And

A setting device 61 is connected to the CPU 53 via the interface 59. The setting device 61 controls the reference data T0 relating to the ejector start signal and the moving position (distance) and the moving speed (acceleration / deceleration) of the chuck 39. The drive timing data of the first to third servomotors 41, 43, and 45 are set.

A left / right drive control circuit 63, a front / rear drive control circuit 65, a vertical drive control circuit 67, and a chuck drive control circuit 68 are connected to the CPU 53, respectively.
The corresponding first to third servomotors 41, 43, 45 and the chuck portion 39 are connected to 3.65, 67, 68. The drive control circuits 63, 65, 67 receive position detection signals from position detection members 47, 49, 51 provided in the first to third servomotors 41, 43, 45, respectively. The driving of the first to third servomotors 41, 43, and 45 is controlled based on the detection signal.

Next, an output control method of the ejector start signal will be described. First, the traveling body 31 of the molded product unloading machine 27 is located above the center of the molds 13 and 17 in the molding machine 1, the front and rear traveling body 35 is at a retracted position near the fixed mold 17, and the upper and lower frames 37 are chuck parts 39. Has been removed from the space between the molds 13 and 17 and has been moved to a standby position located above the tie bar 9 without interference.

The molding machine 1 is located above the molds 13 and 17.
Left and right movement distance of the traveling body 31 reaching a release position set on the front side or back side of the movable mold 13 before and after reaching the holding position where the chuck portion 39 faces the movable mold 13 opened from the retracted position at a predetermined interval. The vertical movement distance of the vertical frame 37 between the front and rear movement distance of the traveling body 35 and the mold opened by the chuck portion 39 from above the mold is set in advance by the setting device 61.
It is stored in M57.

3 to 5, when the mold opening completion signal is input from the molding machine 1 in the above state, the molding machine 1 moves back the mold clamping member 15 to move the fixed mold 17 from the movable mold 13 to the movable mold 13. Is opened. In step 71, the CPU 53 of the molded product unloading machine 27 controls the driving of the third servomotor 45 in parallel with the mold opening operation in response to the mold opening completion signal.
7, the first timer area 57a is activated, and the output timing of the ejector start signal is measured in the RAM 57.

At the time of the first extraction operation, the output timing of the ejector start signal is set to the output timing data T0, and during the extraction, the output data is set to the timing data Tex of the previous extraction.

At the time of lowering operation of the upper and lower frames 37, the CPU 53 detects a moving position based on a position detection signal from the position detecting member 51, and the third servo motor 45 detects a predetermined position between the opened molds 13 and 17. When the lower position is reached, the drive control of the third servomotor 45 is interrupted in step 73, and the drive of the second servomotor 43 is controlled to move the chuck 39 forward.

During the lowering operation and the forward operation, the CPU 5
3 is the output timing data T in which the measurement data of the first timer area 57a is set in advance in step 75 (the output timing of the ejector start signal is T0 at the time of initial extraction, and the output timing data at the time of previous extraction during extraction is (Tex) is determined, and if step 75 is NO, the time measurement is continued.

Conversely, if the first timer area 57a measures the output timing data T0 or Tex and the result of step 75 is YES, the CPU 53 outputs an ejector start signal to the molding machine 1 in step 77 to be driven. The molded product held in the movable mold 13 is ejected by the ejector pins.

At the time of the above-mentioned forward operation, the CPU 53 executes step 7
9, the forward movement position of the chuck portion 39 between the dies 13 and 17 is detected based on the position detection signal output from the position detection member 49 of the second servomotor 43, and the movable die is opened by the chuck portion 39. At step 81, it is determined whether or not an ejector completion signal output upon completion of the ejecting operation by the ejector pin is input from the molding machine 1 in step 81. Is determined.

Now, before the determination in step 79 becomes YES, the determination in step 81 is YES, that is, the chuck 39
2 before ejector reaches the holding position
When the ejection of the ejector 5 is completed and an ejector completion signal is input from the molding machine 1, the CPU 53 performs the second
After activating the timer area 57b and starting time measurement, it is determined in step 85 whether or not the chuck section 39 has reached the holding position.

If the determination in step 85 is YES, the CPU 53 determines in step 87 that the second timer area 5
7b, the delay time (-) t1 (the delay until the chuck 39 reaches the holding position) from the output of the ejector completion signal until the chuck 39 reaches the holding position is stored in the RAM 57. .

Conversely, if the determination in step 81 is YES after the determination in step 79 is YES, that is, if the ejection of the molded product 25 by the ejector pins is not completed when the chuck 39 reaches the holding position, CPU53
Starts the time measurement by activating the second timer area 57b at the timing when the chuck portion 39 reaches the holding position in step 89, and then determines in step 91 whether an ejector completion signal has been input from the molding machine 1 or not. .

If the determination in step 91 is YES, the CPU 53 determines in step 93 that the second timer area 5
After the time measurement by 7b is completed, the advance time (+) t1 until the ejector completion signal is input after the chuck section 39 reaches the holding position is stored in the RAM 57.

After measuring the delay time data (-) t1 or the advance time data (+) t1 in steps 87 and 93, the CPU 53 proceeds to step 95 to store the respective delay time data (-) t1 or advance in the RAM 57. After the extraction processing of the time data (+) t1, at step 97, the extraction time data t3 extracted is subtracted from the output timing data T0 or Tex of the ejector start signal, and the output timing data T of the ejector start signal in the next extraction operation is subtracted. (T = T0 or Tex−t3) is set.

That is, if the ejector completion signal is input before the chuck unit 39 reaches the holding position, the output timing T of the ejector start signal at the time of the next ejection operation is changed to the output timing of the ejector start signal at the time of the previous ejection operation. If the ejector completion signal is input after the chuck unit 39 reaches the holding position, which is later than the timing data T0 (Tex) by the time t1, the output timing data T of the ejector start signal at the time of the next unloading operation is changed to the previous timing. The timing at which the chuck unit 39 reaches the holding position and the timing at which the ejector operation is completed are substantially coincident with each other by controlling the timing to be earlier by the time t1 than the timing in the output timing data T0 (Tex) at the time of the unloading operation.

In the extraction processing at step 95, the delay time data (-) t1 or the advance time data (+) t1 stored in the RAM 57 is extracted for each extraction operation to obtain extraction time data t3. Output timing data Tex (T0) of the ejector start signal in the operation
Extraction time data t3 extracted for each extraction operation from
Is subtracted to determine the ejector start timing data T in the next ejection operation, or the delay time data (−)
t1 or advance time data (+) t1 is sequentially stored in the RAM 57, and, for example, every five extraction operations, the delay time data (-)
The average value of the delay time data (-) t1 or the advance time data (+) t1 excluding the maximum value and the minimum value of the t1 or the advance time data (+) t is defined as the extraction time data t3, Ejector start timing data Tex
Any mode may be employed in which the ejector start timing data T at the time of the next extraction operation is determined by subtracting the average value extraction time data t3 from (T0).

Thus, in the next removal operation, the output timing of the ejector start signal is set and the mold is opened so that the ejecting operation of the molded product 25 by the ejector pin is completed almost at the same time when the chuck portion 39 reaches the holding position. The entry time of the chuck portion 39 in the molds 13 and 17 can be minimized.

In parallel with the above-described arithmetic processing, the CPU 53 determines in step 99 whether or not an ejector completion signal has been input from the molding machine 1 after the chuck portion 39 has reached the holding position during the unloading operation. In the case of (1), the chuck 39 is actuated in step 101 to hold the protruded molded product 25, and after a predetermined time has elapsed, the second servomotor 43 is reversely driven and controlled in step 103 to hold the molded product 25. Is moved to the retracted position, and then the third servo motor 45
Is driven in reverse to return the chuck portion 39 to the standby position,
In step 107, the first servomotor 41 is drive-controlled to move the chuck portion 39 laterally to the front side or the back side of the molding machine 1 and move to the release position to complete the removal of the molded product 25.

In this embodiment, the chuck portion 39 is
The output timing of the ejector start signal output on the way to the holding position between 17 is set so that the timing at which the chuck portion 39 reaches the holding position and the timing at which the ejecting operation of the molded product 25 by the ejector mechanism is completed are almost the same. With this setting, the time required for the chuck portion to enter the space between the dies 13 and 17 and hence the mold opening time of the molding machine 1 can be minimized, and the molding operation can be performed efficiently.

[0039]

According to the present invention, the difference between the time required for the chuck to reach the holding position and the time required for completing the ejector operation is minimized, and the time required for the chuck to enter between the dies is reduced, thereby increasing the molding cycle speed. Can be

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a molded product unloading machine.

FIG. 2 is an electric block diagram showing a control device of the molded product unloading machine.

FIG. 3 is a part of a flowchart showing setting of an output timing of an ejector start signal.

FIG. 4 is a part of a flowchart showing setting of an output timing of an ejector start signal.

FIG. 5 is a timing chart of each signal.

[Explanation of symbols]

1-molding machine, 13-movable mold, 17-fixed mold, 27-
Molded product take-out machine, 39-chuck unit, output timing data of T-ejector start signal, (-) t1-delay time data, (+) t1-lead time data

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F202 AP06 AR07 AR11 CA11 CB01 CM02 CM12 4F206 AP067 AR077 AR11 JA07 JL02 JM06 JN41 JP11 JP18

Claims (6)

[Claims] An ejector start signal is output to a molding machine when the chuck section starts moving based on a mold opening completion signal from the molding machine and is controlled to move to a holding position between the opened molds. Is operated to eject the molded product held in the mold, release the molded product, and remove the molded product.
An ejection control method in which the output timing of an ejector start signal is set such that the timing at which the chuck unit reaches the holding position coincides with the input timing of an ejector completion signal input from the molding machine when the ejection of the molded article by the ejector mechanism is completed. 2. An apparatus according to claim 1, wherein when the ejector completion signal is input before the chuck section reaches the holding position, a delay time from the input of the ejector completion signal to the arrival of the chuck section at the holding position is determined. A takeout control method for a molded product takeout machine that measures and controls the output timing of an ejector start signal at the time of the next takeout operation so as to be output later by the delay time. 3. When the ejector completion signal is inputted after the chuck section reaches the holding position, the advance time from the timing when the chuck section reaches the holding position to the input of the ejector completion signal is set. A takeout control method for a molded product takeout machine that measures and outputs the output timing of an ejector start signal at the time of the next takeout operation so as to be output earlier by the advance time. 4. A method according to claim 2, wherein the output timing of the ejector start signal is set based on a delay time or an advance time measured during the pre-extracting operation. 5. The method according to claim 2, wherein the output timing of the ejector start signal is set based on an average value of a plurality of delay times or advance times measured during the pre-extracting operation. 6. The method according to claim 5, wherein the output timing of the ejector start signal is set based on an average value of a plurality of delay times or advance times measured during the pre-fetch operation. A method for controlling the removal of a molded product removal machine, wherein the average value is obtained by subtracting the maximum value and the minimum value from the delay time or advance time.