JP3784980B2 - Method and apparatus for monitoring mold opening / closing sequence of split mold in mold mechanism of injection molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold opening / closing sequence monitoring method and apparatus in a mold mechanism using an intermediate mold such as a core.
[0002]
[Prior art]
Conventionally, in the complicated mold mechanism part (41) using an intermediate mold (A) (B) (C) (D) like a core, the order of mold opening and clamping is strictly determined. There was a problem that the molds (42) and (43) would be damaged if a mistake was made. Therefore, in the conventional method, the strength of the friction strength is applied to the contact part between the moving molds (43), for example, there are (A) (B) (C) as an intermediate mold, (A) → (B) → When opening in the order of (C), the friction force of the intermediate mold (A) with respect to the intermediate mold (B) is small, and the friction force of the intermediate mold (B) with respect to the intermediate mold (C) is increased. Then, the intermediate mold (A) opens first, then the intermediate mold (B) opens, and finally the intermediate mold (C) opens. In the case of mold clamping, the reverse is (C) → (B) → (A).
[0003]
In the case of such a friction type, when the mold becomes old and the frictional force changes, an operation error gradually occurs, and finally an accident such as causing a malfunction and causing damage to the mold is said to occur. There was a problem.
[0004]
[Problems to be solved by the invention]
The problem to be solved by the present invention is that when the moving order of the moving side mold is out of order, this is immediately detected and notified to the operator, and the mold of the split mold in the mold mechanism part of the injection molding machine is prevented in advance. It is in the development of the switching order monitoring method and its device.
[0005]
[Means for Solving the Problems]
“Claim 1” is composed of “a fixed mold (1) and a moving mold (2) composed of a plurality of intermediate molds (2a) and moving molds (2b) whose moving order is defined. A mold opening / closing sequence monitoring method for split molds in a mold mechanism (3) of an injection molding machine,
At least either during mold opening or mold clamping, the mold opening operation or mold clamping operation is performed while monitoring the mold opening / closing sequence of the moving side mold (2). When an error occurs in the movement order, the operation is stopped at that position, or the moving side mold (2) is returned to the position before the operation ”.
[0006]
According to this method, even when there is a malfunction in the mold opening / closing sequence when the mold is opened or closed, the operation is stopped immediately after that is known, so that it is possible to prevent a mold breakage accident. . Here, the malfunction check of the mold opening / closing sequence may be performed only when the mold is opened or when the mold is clamped, but is usually performed both when the mold is opened and when the mold is clamped. If a malfunction occurs, the subsequent operation is stopped at the malfunction occurrence position or returned to the position before the malfunction. In the present invention, the “position before operation” is a point from the operation start position {(X) or (0)} to the malfunction occurrence position {(X1) or (X2)}, where the mold operation is a malfunction occurrence position. It means not moving before.
[0007]
In addition, this Claim 1 is a case where a mold movement is confirmed in the continuous movement of mold opening or mold clamping. That is, it is assumed that the moving mold is composed of a first intermediate mold (2a1), a second intermediate mold (2a2), and a third intermediate mold (2a3). When the mold is opened, the first intermediate mold (2a1) → the second intermediate mold (2a2) → the third intermediate mold (2a3) moves. When the mold is clamped, the third intermediate mold (2a3) → the second intermediate mold (2a2) → When moving with the first intermediate mold (2a1), if a malfunction occurs at any stage, the subsequent mold operation is stopped.
[0008]
“Claim 2” is an alternative method of monitoring the mold opening / closing sequence of the split mold in the mold mechanism (3) of the injection molding machine, “fixed mold (1) and a plurality of intermediate molds whose movement order is defined. (2a) or a movable mold (2) composed of a movable mold (2b) and a mold mechanism (3) configured to open or clamp the mold at least during mold opening or clamping The operation is temporarily interrupted, and during this interruption, it is confirmed whether or not each of the moving side molds (2) has been opened or clamped in the prescribed mold opening / closing sequence, and the mold opening or closing is performed in the prescribed mold opening / closing sequence. If the mold has been clamped, the mold is opened or clamped to the mold opening completion position or to the mold clamping completion position. If the mold is not moved in the prescribed mold opening / closing sequence, the mold is stopped at that position. Or “return to the state before the movement”.
[0009]
According to this, even when there is a malfunction in the mold opening / closing sequence at the time of mold opening or mold clamping, it is possible to know immediately and to prevent a mold breakage accident. Here, in the case of Claim 1, the mold opening / closing sequence is confirmed in the continuous movement of mold opening, whereas in Claim 2, the mold opening or clamping is temporarily stopped and the mold is stopped during this stop. The difference is that the opening and closing order is confirmed. In this case as well, the malfunction check of the mold opening / closing sequence may be performed only when the mold is opened or when the mold is clamped. If a malfunction occurs, the subsequent operation is stopped at the malfunction occurrence position or returned to the position before the malfunction.
[0010]
In the present specification, “confirmation of mold opening / closing order” means (1) as described in claim 1 and (1) as in claim 1, the movement order of intermediate mold (2a) and movable mold (2b). When signals are sequentially stored from the sensors (4a), (4b), and (4c) and whether the order is correct or not are checked, and (2) as described in claim 2, which intermediate type is at the stop position There are cases where (2a) or the movable mold (2b) is closed, and which intermediate mold (2a) or movable mold (2b) is open is checked in a pattern. In this case, the stop position may be either when the mold is opened, when the mold is clamped, or both. In FIG. 2, (a) is an example of good mold operation when the first intermediate mold (2a1) is opened first and the others are closed. The first sensor (4a) is open and the other sensors (4b), (4c),... Are closed, and the quality of the mold operation is recognized based on the information from the sensor (4). In the figure, (23) is a guide bar for guiding the intermediate mold (2a) or the movable mold (2b).
[0011]
“Claim 3” is the method for monitoring the mold opening / closing sequence of the split molds in the mold mechanism part of the injection molding machine according to claim 1, wherein “the mold movement is not performed in a prescribed order”. In this case, the operator can immediately know the occurrence of a malfunction and can quickly restore the injection molding machine.
[0012]
The split mold opening / closing sequence monitoring device in the mold mechanism (3) of the injection molding machine according to claim 4 is an apparatus for carrying out claim 1, , A movement-side mold (2) composed of a plurality of intermediate molds (2a) and movement molds (2b) with a defined movement order, and a sensor for sensing the movement of each movement-side mold (2) ( 4) and at least when the mold is opened or clamped, it is confirmed whether or not each of the moving molds (2) is opened in the prescribed mold opening / closing sequence by the signal from the sensor (4). If the mold is moved in the order of mold opening / closing, the mold is moved to the mold opening completion position (X) or the mold clamping completion position (0), and the mold is not opened in the specified mold opening / closing order. In some cases, it is composed of a control unit (5) that controls the operation so that the operation is stopped at that position or the moving mold (2) is returned to the position before the operation. ''
[0013]
The mold opening / closing sequence monitoring device for split molds in the mold mechanism (3) of the injection molding machine according to "Claim 5" is an apparatus for carrying out Claim 2, and "the fixed mold (1) and , A plurality of moving molds (2) composed of intermediate molds (2b) and moving molds (2a) in which the moving order is defined, and sensors for sensing the movement of each moving mold (2) ( 4) and at least during mold opening or clamping, the mold opening or clamping operation is temporarily interrupted, and during this interruption, each of the moving side molds (2) is regulated by a signal from the sensor (4). Check if the mold has been moved, and if the mold has been moved in the specified mold opening / closing sequence, then move the mold to the mold opening completion position (X) or the mold clamping completion position (0). If the mold has not been moved in the prescribed mold opening / closing sequence, the control unit (5) controls the operation so as to stop at that position or return to the state before the movement. ) And "".
[0014]
“Claim 6” is a method for monitoring the mold opening / closing sequence of the split molds in the mold mechanism part (3) of the injection molding machine according to claim 4 or 5, wherein “the mold is moved in a prescribed order. If not, the alarm unit (5a) that informs the occurrence of malfunction is installed in the control unit (5) '', so that the operator knows immediately when malfunction occurs, You can try to recover. The alarm unit (5a) may be in the form of a lamp such as a patrol light, may be a voice warning by a speaker, or may be a warning display on the CRT of the control unit (5).
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail according to illustrated embodiments. FIG. 1 is a partially cutaway front view of a mold mechanism (3) of an injection molding machine. In the figure, the fixed die (1) is attached to the fixed die plate (6), and the moving side die (2) is attached to the moving die plate (7). A tie bar (9) is disposed between the fixed die plate (6) and the tailstock (8), and the movable die plate (7) is slidably disposed.
[0016]
Further, a mold clamping mechanism (T) made of, for example, a toggle mechanism is disposed between the movable die plate (6) and the tailstock (8), and the mold opening is performed by operating the mold clamping mechanism (T). Alternatively, mold operation such as mold clamping can be performed. There are various types of mold clamping mechanisms (T) such as the direct acting type in addition to the toggle type, and the type is not limited, but here, the toggle type is a representative example.
[0017]
The toggle type mold clamping mechanism (T) has a well-known structure, and only an outline thereof will be described here to the extent necessary. The tail stock (8) is provided with a mold clamping cylinder (10), and a rod (11) of the mold clamping cylinder (10) is attached to a cross head (12) of the mold clamping mechanism (T).
[0018]
The mold is composed of a fixed mold (1) and a moving mold (2) .In the present invention, the moving mold (2) is a moving mold (2b), a core, etc. It consists of an intermediate mold (2a). The intermediate mold (2a) is composed of one or more sheets, and the number and operation of the intermediate mold (2a) can be freely set depending on the mold structure.
[0019]
In the present invention, three intermediate molds (2a1) (2a2) (2a3) are used, and a molded article (13) having a protrusion (14) on its outer surface and a recess (15) on its inner surface. An example of molding is described. Of course, the present invention is not limited to this.
[0020]
The first intermediate mold (2a1) is for constituting the outer surface of the molded product (13), and is set so as to be divided into upper and lower parts in the figure, and an inclined hole (16) is formed in each of the divided molds. It is installed. An inclined pin (17) planted in the fixed mold (1) is slidably inserted into the inclined hole (16). Further, a slide bolt (19) is slidably inserted in a plate (18) attached to the outer surface of the movable mold (2b) in a direction perpendicular to the moving direction of the movable mold (2b), and the screw portion thereof is the above-mentioned split middle. An elastic force is applied so as to draw the divided intermediate mold (2a1) toward the plate (18) by a spring (20) attached to the slide bolt (19).
[0021]
The second intermediate mold (2a2) is disposed on the opposite side of the movable mold (2b), and the third intermediate mold (2a2) is inclined in the direction in which the separation distance gradually decreases toward the fixed mold (1). The intermediate mold (2a3) is inserted, and the third intermediate mold (2a3) is moved closer and away by moving the second intermediate mold (2a2). The front end portion of the third intermediate mold (2a3) constitutes the inner peripheral surface of the molded product (13), and is used to form a recess (15) on the inner peripheral surface of the molded product (13). Protrusions (15a) are formed. (21) is an eject pin.
[0022]
A pair of male and female sensors (4) are attached to the three intermediate molds (2a1), (2a2), (2a3) and the movable mold (2b), respectively, and the intermediate molds (2a1), (2a2), (2a3) In addition, the contact / separation of the movable type (2b) is sensed. Any type of sensor (4) can be used as long as the contact / separation state can be determined. For example, a photoelectric switch composed of a proximity switch, a limit switch, and a projector / receiver. Etc. are raised.
[0023]
Next, the operation of the present invention will be described. First, the case of confirming the operation sequence in the continuous mold operation will be described. First, the metering resin (24) in the injection cylinder (22) is injected and filled into the mold cavity in the mold-clamping state. This state is shown in FIG. After holding and cooling, the mold clamping cylinder (10) is operated to open the mold. In this case, the movement order is fixed for the intermediate mold (2a1) (2a2) (2a3) and the movable mold (2b), and if the order is out of order, the mold cannot be opened properly, and the mold is clamped in the next process. In some cases, the mold may be damaged due to the poor operation sequence.
[0024]
Next, when the space between the fixed mold (1) and the first intermediate mold (2a1) is opened as shown in FIG. 4, the first intermediate mold (2a1) is aligned with the mold opening and along the inclined pin (17). Further, it is drawn toward the plate (18) by the elastic force of the spring (20) and gradually moves away from the outer surface of the molded product (13). When the first intermediate mold (2a1) is separated from the fixed mold (1), the control unit (4a) disposed between the fixed mold (1) and the movable mold (2b) A signal is output to 5), and the separation of the first intermediate mold (2a1) is detected and stored in the control section (5).
[0025]
Subsequently, as shown in FIG. 5, when the second intermediate mold (2a2) moves backward, the third intermediate mold (2a3) inserted into the second intermediate mold (2a2) in a constricted shape is inserted into the second intermediate mold (2a2). 2a2) moves in the direction of narrowing along the inclined working hole (25), and the molded product (13) is supported by the third intermediate die (2a3) and the eject pin (21). (2) It will be in a suspended state. At this time, a signal is output from the second sensor (4b) disposed between the second intermediate mold (2a2) and the movable mold (2b) to the controller (5), and the second intermediate mold (2a2) Is detected and stored in the control section (5). Finally, the eject pin (21) is protruded, and the molded product (13) is dropped and taken out. In this mold opening stage, the sensor (4) is operated as the first sensor (4a) → the second sensor (4b), so that it is determined that the mold operation is correct. Mold opening is continuously performed up to the mold opening completion position (X).
[0026]
When the mold opening is completed, cleaning of the parting surface and other necessary work are performed, and then the mold clamping is performed. The mold clamping operation is the reverse of the previous one. First, the second intermediate mold (2a2) moves forward, the distance between the third intermediate molds (2a3) expands, and then the tip of the second intermediate mold (2a2) and the third The inner surface side of the molded product (13) is completed at the place where the tips of the intermediate mold (2a3) coincide. At this time, it can be seen that the second intermediate mold (2a2) is closed by the second sensor (4b).
[0027]
Subsequently, the entire moving mold (2) is closed. As the first intermediate mold (2a1) approaches the fixed mold (1), the inclined pin (17) gradually moves into the inclined hole (16). As a result, the first intermediate mold (2a1) is separated from the plate (18) against the spring (20), and finally the first intermediate mold (2a1) is pressed against the fixed mold (1). Clamping is complete. Also in this case, it can be seen that the first intermediate mold (2a1) is closed by the first sensor (4a). That is, since the second sensor (4b) → the first sensor (4a) is operated, it is determined that the mold operation is correct, and the mold clamping is performed to the mold clamping completion position (0). Is performed continuously.
[0028]
Here, if a malfunction occurs at any stage, and this is detected by any sensor (4), the mold operation does not proceed any further and stops at that position, or the previous state Return to. The return position means that the mold operation does not move before the malfunction occurrence position at the point from the operation start position {(X) or (0)} to the malfunction occurrence position {(X1) or (X2)}. To do.
[0029]
The above is a case where the operation sequence is confirmed during the continuous mold opening / clamping operation. Next, the case where the mold operation is confirmed after stopping temporarily will be described. In this case, as shown in FIG. 1, place (X1) and (X2) [these are set by the stroke from the mold clamping completion position (0)] to stop when the mold is opened and when the mold is clamped. (t1) and (t2) are set in advance. Here, the stop position when the mold is opened is (X1), and the stop position when the mold is clamped is (X2). (X1) and (X2) may coincide with each other, but may be set to different positions {that is, (X1) <(X2) or (X1)> (X2)}. In this case, it is preferable to set a numerical value that allows for an overrun of the moving mold (2) because the mold operation can be confirmed at the actual stop position.
[0030]
The mold opening and clamping are performed by the operation as described above. At the time of mold opening, after the first intermediate mold (2a1) is moved to the set position (X1), the second intermediate mold ( 2a2) before moving, the stop time is (t1), and at the time of mold clamping, set position (X2) after moving the second intermediate mold (2a2), before moving the first intermediate mold (2a1), stop time (t2 ).
[0031]
Here, if the mold clamping stop position (X2 = IV) <mold opening stop position (X1 = III),
(1) When the mold is opened, the mold opening operation is interrupted at the set stop position (X1 = III) and the mold operation is temporarily stopped. When the stop time (t1) has elapsed, the sensor (4) opening / closing status is checked. . In this embodiment, since the first intermediate mold (2a1) is open and the second intermediate mold (2a2) is closed, the first sensor (4a) is open and the second sensor (4b) is closed. Will be normal. Here, for example, when the first sensor (4a) is closed or the second sensor (4b) is in an open state, it is said that the sensor is abnormal, and further mold opening is dangerous. Return to (X2 = IV), stop at this stage, and simultaneously issue a “warning message” from the alarm section (5a).
(2) Conversely, during mold clamping, the mold clamping operation is interrupted at the midway stop set position (X2 = IV) to temporarily stop the mold operation and check the open / close status of the sensor (4). In this embodiment, since the second intermediate mold (2a2) is closed and the first intermediate mold (2a1) is opened, the first sensor (4a) is opened and the second sensor (4b) is closed as described above. That is normal. Here, for example, if the first sensor (4a) is closed or the second sensor (4b) is in an open state, it will be said that the sensor is abnormal, and further mold clamping is dangerous. Return to (X1 = III), stop at this stage, and issue an alarm as before. In any case, since the mold is not moved beyond the stop position, it is possible to avoid damage to the mold.
[0032]
Next, if the setting position is opposite to the above, that is, if the mold clamping mid-stop setting position (X2 = II)> the mold opening mid-stop setting position (X1 = I),
(3) When the mold is opened, the mold opening operation is interrupted at the midway stop set position (X1 = I) to temporarily stop the mold operation and check the open / close status of the sensor (4). In this embodiment, since the first intermediate mold (2a1) is open and the second intermediate mold (2a2) is closed, the first sensor (4a) is open and the second sensor (4b) is closed. Will be normal. Here, for example, when the first sensor (4a) is closed or the second sensor (4b) is in an open state, it is said that the sensor is abnormal, and further mold opening is dangerous. ), Stop at this stage and issue an alarm as described above.
(4) Conversely, during mold clamping, the mold clamping operation is interrupted at the midway stop set position (X2 = II) to temporarily stop the mold operation and check the open / close status of the sensor (4). In this embodiment, since the second intermediate mold (2a2) is closed and the first intermediate mold (2a1) is opened, the first sensor (4a) is opened and the second sensor (4b) is closed as described above. That is normal. Here, for example, when the first sensor (4a) is closed or the second sensor (4b) is in an open state, it is said that the sensor is abnormal, and further mold clamping is dangerous. ), Stop at this stage and issue an alarm as before. In either case, since the mold is not moved beyond the stop position, the mold can be prevented from being damaged.
[0033]
In the above case, if a sensor abnormality is detected, the sensor may be stopped at that position, and further, an alarm unit (5a) of the control unit (5) may display an error on a CRT or the like, or the lamp may blink. And an alarm sound to inform the operator of the occurrence of an abnormality and to make a quick recovery.
[0034]
【The invention's effect】
As described above, according to the method of the present invention, the malfunction of the mold at the time of mold opening and clamping is reliably detected in the middle of the mold operation, and no further mold operation is performed when the malfunction occurs, so that the mold is damaged. Such an accident can be prevented in advance.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a mold mechanism of an apparatus of the present invention. FIG. 2 is an explanatory diagram of mold movement in FIG. 1. FIG. 3 is an enlarged view when a first intermediate mold is opened in mold movement of the present invention. 4 is an enlarged sectional view when the second intermediate mold is opened in the mold movement of the present invention. FIG. 5 is an enlarged sectional view when the mold opening of the present invention is completed. FIG. [Explanation of the symbols]
(1) Fixed mold
(2) Moving side mold
(2a) Intermediate type
(2b) Mobile type
(3) Mold mechanism
(4) Sensor

Claims (6)

Method for monitoring mold opening / closing order of split molds in a mold mechanism part of an injection molding machine composed of a fixed mold and a moving side mold composed of a plurality of intermediate molds and moving molds in which the moving order is defined Because
At least either when the mold is opened or when the mold is clamped, the mold opening operation or the mold clamping operation is performed while monitoring the mold opening / closing sequence of the moving side mold, and the movement sequence is performed at least in either process When an error occurs in the mold, the operation is stopped at that position, or the movable mold is returned to the position before the operation. Method for monitoring mold opening / closing order of split molds in a mold mechanism part of an injection molding machine composed of a fixed mold and a moving side mold composed of a plurality of intermediate molds and moving molds in which the moving order is defined Because
At least in the middle of mold opening or mold clamping, the mold opening or clamping operation is temporarily interrupted, and at the time of this interruption, it is confirmed whether each of the moving side molds is opened or clamped in the prescribed mold opening / closing sequence, If the mold is opened or clamped in the specified mold opening / closing sequence, then the mold is opened or clamped to the mold opening completion position or the mold clamping completion position, and the mold is not moved in the specified order The method for monitoring the mold opening / closing sequence of the split molds in the mold mechanism part of the injection molding machine, characterized by stopping at that position or returning to the state before the movement. In the mold opening and closing order monitoring method of the split mold in the mold mechanism part of the injection molding machine according to claim 1 or 2,
A mold opening / closing sequence monitoring method for split molds in a mold mechanism of an injection molding machine, characterized in that when a mold is not moved in a prescribed order, the occurrence of a malfunction is notified. A stationary mold, a moving mold composed of a plurality of intermediate molds and moving molds whose moving order is defined, a sensor for sensing the movement of each moving mold, and at least when the mold is opened or clamped Then, it is confirmed by the signal from the sensor whether or not each of the moving side molds is opened in a prescribed mold opening / closing sequence. Move the mold to the mold opening completion position or mold clamping completion position, and if the mold is not opened in the prescribed mold opening / closing sequence, stop the operation at that position or return the moving mold to the position before the operation A mold mold opening / closing sequence monitoring device in a mold mechanism part of an injection molding machine, characterized in that it is configured with a control part that performs operation control as described above. A fixed mold, a plurality of moving molds composed of intermediate molds or moving molds whose moving order is defined, a sensor for sensing the movement of each moving mold, and at least during mold opening or clamping The mold opening or clamping operation is temporarily interrupted at, and during this interruption, it is confirmed by the signal from the sensor whether or not each of the moving molds is moving the prescribed mold, and the prescribed mold opening / closing sequence If the mold has been moved, the mold is subsequently moved to the mold opening completion position or the mold clamping completion position. If the mold movement is not performed in the prescribed mold opening / closing sequence, the mold is stopped at that position. A mold opening / closing sequence monitoring apparatus for split molds in a mold mechanism part of an injection molding machine, characterized in that it is configured with a control part that performs operation control so as to return to a state before movement. In the mold opening / closing sequence monitoring method of the split mold in the mold mechanism part of the injection molding machine according to claim 4 or 5,
When the mold is not moved in the prescribed order, a warning part that notifies the occurrence of malfunction is installed in the control part, and the mold opening and closing of the split mold in the mold mechanism part of the injection molding machine Order monitoring method.

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