JPH11235738A - Injection molding machine equipped with a resin molded product removal device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To shorten the molding cycle time of a molded product, prevent the ejection mechanism and the mold from being damaged by mold clamping, and eliminate the need for a mechanical movable mold clamping stop device. . SOLUTION: At the same time when the in-mould advance / retreat portion 5X of the take-out mechanism 5 starts retreating out of the mold, the movable mold 4 is expectedly started in the mold clamping direction, and the position of the in-mould advance / retreat portion 5X at this time. Is detected by the second detection means 10 and input to the safety judgment circuit of the unloading mechanism control means 9 to determine whether or not the in-mold advance / retreat portion 5X is at a position where the movable mold 4 collides with the movable mold by continuing the mold clamping of the movable mold 4. Is determined, and if it is determined that the vehicle is at a position where no collision occurs, mold clamping is performed. On the other hand, if it is determined that the vehicle is at the collision non-safety position, the unloading mechanism control means 9 outputs a mold clamping operation prohibition signal to the controller 12A of the movable mold control means 12, and based on the prohibition signal, the driving device 12B is stopped, and the movement of the movable mold 4 in the tightening direction is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine provided with an apparatus for removing a resin molded product, and more particularly, to shortening the cycle time of resin molding and damaging a removal mechanism and a mold by clamping. TECHNICAL FIELD The present invention relates to an injection molding machine provided with a resin molded product take-out device configured to prevent the occurrence of the resin molding.

[0002]

2. Description of the Related Art In general, a resin molded article molded by an injection molding machine is automatically taken out by an ejection mechanism of the injection molded article. 6 (a) to 6 (a) to 6 (a) to 6 (c) show a procedure of automatically removing a molded product by a conventionally performed injection product removal mechanism.
This will be described based on (j) and (k) to (r) of FIG. (A). A fixed mold 2 attached to a fixed platen 1,
When the movable mold 4 attached to the movable platen 3 is clamped, molten resin is injected into a cavity (not shown) formed by the fixed mold 2 and the movable mold 4, and is formed into a predetermined shape. You. At this time, a take-out mechanism (not shown)
Is in a standby state at a predetermined standby position. Here, a mold opening signal is output from the control means (not shown) to the opening and closing mechanism (not shown) of the movable mold 4. (B). The movable mold 4 starts mold opening. (C). The movable mold 4 reaches the mold opening position. (D). The control means outputs an in-mold entry start signal of the gripper 5A to the take-out mechanism. (E). The gripper 5A enters the mold based on the numerical control of the control means. (F). The gripper 5A reaches a fixed position in the mold based on the numerical control of the control means. (G). An operation start signal is output from the control means to an actuator for an ejector (not shown). (H). An ejector (not shown) operates. (I). The molded product 6 is made to protrude by the ejector, and the gripping part 5A holds the molded product 6 by suction or mechanically by the operation of the pneumatic device incorporated in the take-out mechanism. That is, the molded product 6 is chucked by the gripping portion 5A. (J). The chucking of the molded product 6 by the grip 5A is confirmed. (K). The control unit outputs a pull-out start signal for the gripper 5A to the take-out mechanism. (L). The gripper 5A is pulled out and moved based on the numerical control of the control means. (M). The pull-out movement of the grip 5A is completed. (N). The control unit outputs a removal start signal of the holding unit 5A from the mold to the removal mechanism. (O). The gripper 5A starts to move out of the mold based on the numerical control of the control means. (P). The withdrawal of the grip 5A from the mold is completed. (Q). A mold clamping signal is output from the control means to the opening and closing mechanism of the movable mold 4. That is, the next cycle start signal is output. (R). The movable mold 4 starts clamping. (S). The movable mold 4 is clamped to be in the state of (a), and thereafter, the above procedure is repeated to continuously remove the molded product 6.

[0003] The above-mentioned take-out procedure is performed by sequence control. Therefore, there is a problem that the time for taking out the molded product is relatively long and the molding cycle time is long.

Therefore, the applicant of the present invention has proposed a movable mold 4
The movable mold 4 and the fixed mold 2 are moved in the mold opening direction.
When the detecting means detects that the distance between the opposing surfaces has become the same as the thickness dimension of the in-mould advance / retreat portion of the take-out mechanism 5, the in-mould advance / retreat portion is moved forward in the in-mold direction in real time. Japanese Patent Application No. 6-164698 proposes an injection-molded product take-out apparatus having a prestart structure for shortening a molding cycle time. According to this apparatus, it is possible to shorten the removal time of the molded product and the molding cycle time.

[0005] However, the automatic removal procedure of the molded article by the injection molding product removal mechanism and the automatic removal procedure of the molded article by the injection molded article removal apparatus proposed by the present applicant have been proposed. , The (p)
In step (q), after confirming the completion of the withdrawal of the gripping portion 5A of the removal mechanism 5 from the mold, that is, after the in-mold advance / retreat portion of the removal mechanism has completely retracted out of the mold, the control means opens and closes the movable mold 4 in (q). Outputting a mold clamping signal to the mechanism and starting mold clamping of the movable mold 4 in the above (r);
That is, a procedure is employed in which the control means outputs a cycle start signal to the opening / closing mechanism of the movable mold 4 after the gripping portion 5A of the take-out mechanism 5 has moved out of the mold.

The applicant of the present invention has completed an injection molding machine equipped with a resin molded product take-out device capable of further reducing the molding cycle time and preventing breakage of the take-out mechanism (Japanese Patent No. No. 2646071). According to the present invention, since the movable mold is expected to start clamping without confirming that the in-mold advance / retract portion of the removal mechanism has completely retracted outside the mold, the in-mold advance / retreat portion of the removal mechanism retracts out of the mold. The time required to detect the state where the mold has moved and the time required to output the mold clamping signal to the opening / closing mechanism of the movable mold after detecting the state where the in-mould advanced / retracted part has moved out of the mold become unnecessary.
The molding cycle time can be shortened accordingly. In addition, by starting the movable mold in anticipation and performing mold clamping, even if an unsafe state occurs where the in-mould advance / retreat part collides with the movable mold, this unsafe state is detected and determined. Activating the movable mold closing stop device, the collision between the movable mold and the in-mold moving portion of the take-out mechanism, specifically, the compression damage of the in-mold moving portion by both the fixed mold and the movable mold. And breakage of both molds can be prevented.

[0007]

However, there is a problem that a mechanical movable mold clamping stop device is required. Therefore, the present invention eliminates the need for a mechanical movable mold clamping and stopping device, reduces the molding cycle time as in the invention of Japanese Patent No. 2646071, and can prevent the breakage of the take-out mechanism. It is an object of the present invention to provide an injection molding machine provided with a molded product removal device.

[0008]

In order to achieve the above-mentioned object, the present invention provides a fixed mold and a movable metal which is provided on the fixed mold so as to be able to advance and retreat, and forms an injection molding cavity together with the fixed mold. A mold, a movable mold control means for controlling stop of the movable mold, closing movement of the movable mold and opening movement of the mold, first detecting means for continuously detecting a start and an amount of movement of the movable mold, and the cavity An ejector for projecting a molded article held by the movable mold or a molded article held by the fixed mold to the mold opening limit position after being formed by the mold, and a molded article projected by the ejector And a second detecting means for detecting the position of the in-mould advance / retreat portion of the removing mechanism, and the second detecting means and the first detecting means are electrically connected to each other so that Operation to control operation Mechanism control means, and the position of the in-mould advance / retreat portion of the unloading mechanism immediately after the movable mold has started the mold clamping movement from the open position to the fixed mold direction under the control of the movable mold control means. Detected by the second detection means,
It is determined whether or not the in-mould advance / retreat portion is at a position where the movable mold collides with the movable mold by continuing to move in the mold-clamping direction. The control means outputs a prohibition signal of the mold clamping operation to the movable mold control means, and the movement of the movable mold in the clamping direction is stopped by the control of the movable mold control means based on the prohibition signal. The present invention is characterized in that a collision between a mold and an in-mould advance / retreat portion of the take-out mechanism is avoided.

According to the present invention, mold clamping of the movable mold is started without confirming the state where the in-mould advance / retreat portion of the take-out mechanism has completely retracted outside the mold. In other words, since the mold clamping of the movable mold is expected to start, the time required to detect the state in which the in-mould advance / retract portion of the unloading mechanism has exited out of the mold, and the in-mould advance / retreat portion has exited the mold. The time required to output the mold clamping signal to the opening and closing mechanism of the movable mold after detecting the state becomes unnecessary, and the molding cycle time can be shortened accordingly. Here, if the retreat operation outside the mold at the part inside the mold is properly performed, the mold immediately after the movable mold starts the mold clamping movement from the opening limit position toward the fixed mold (expected start). By detecting the position of the moving part by the second detection means, it is possible to determine that the moving part in the mold is at a safe position where the moving part does not collide with the movable mold by continuing the mold clamping of the movable mold. Continue to do so. On the other hand, if the in-mold retreating operation of the in-mold retreating part is not proper, the position of the in-mold retreating part is detected by the second detecting means immediately after the movable mold has been estimated from the limit position to the fixed mold direction. Accordingly, it is determined that the in-mold advance / retreat portion is at the non-safety position where the movable mold collides with the movable mold due to the continuation of mold clamping of the movable mold. Based on this non-safety determination, the movement of the movable mold in the tightening direction is stopped by the control of the movable mold control means.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a main part of an injection molding machine provided with the present invention. The same or corresponding parts as those of the conventional example are denoted by the same reference numerals and described. In this figure, a fixed mold 2 is attached to a fixed platen 1,
A movable mold 4 is attached to the movable platen 3. One end of the movable platen 3 is movable along a plurality of tie bars 7 attached to the fixed platen 1, and a cavity (not shown) is formed by clamping the fixed mold 2 and the movable mold 4. The cavity is filled with a molten resin from an injection device (not shown). Movable platen 3
The movable mold 4 is stopped, and the mold clamping movement and the mold opening movement are controlled by the movable mold control means 12. The movable mold control means 12 controls the movable platen 3 and the movable mold 4 by a controller 12A and a signal output from the controller 12A.
12 for stopping, closing and moving the mold
B is provided.

The apparatus for removing an injection-molded article includes first detection means 8 for detecting the movement of the movable platen 3 and the movable mold 4, a removal mechanism 5 for removing the molded article 6, and a removal mechanism control means 9; An ejector (not shown) for projecting the molded product 6 is provided on the side.

The first detecting means 8 includes an encoder 8A and a magnetic scale 8B. The encoder 8A is attached to the fixed platen 1, and the magnetic scale 8B is
The magnetic scale 8B moves relatively to the encoder 8A with the movement of the movable platen 3. Therefore, the moving amount of the movable platen 3, that is, the moving amount of the movable mold 4, is continuously detected by the encoder 8A.

The take-out mechanism 5 has a support portion 5B extending in the vertical Y-axis direction. The support portion 5B is provided with an arm portion 5C extending in a direction perpendicular to the support portion 5B (horizontal X-axis). I have. The arm portion 5C includes a take-out arm 5D,
A chuck plate, that is, a grip portion 5A is attached to the tip of the take-out arm 5D. The grip portion 5A, the arm portion 5C, and the take-out arm 5D form an in-mold advance / retreat portion 5X. The movement of the extraction mechanism 5 is detected by the second detection means 10. This second detection means 10
Encoder 10A attached to servo motor 5F
And an encoder 10 attached to the servomotor 5G.
B.

A pneumatic device and a servomotor (both not shown) are incorporated in a base 5E on which the support 5B is erected, and servomotors 5F and 5G are mounted on the support 5B and the arm 5C. ing. Therefore, the arm 5C moves in the X-axis direction by driving the servo motor 5F, and the take-out arm 5D moves in the Y-axis direction by driving the servo motor 5G. The arm 5C rotates with respect to the support 5B by driving the servomotor in the base 5E.

The first detecting means 8 and the second detecting means 10 are electrically connected to the take-out mechanism control means 9, and the operation of the take-out mechanism 5 is controlled by the take-out mechanism control means 9. Controller 12 of unloading mechanism control means 9 and movable mold control means 12
A is also electrically connected, and when the movable mold 4 reaches the mold opening limit position by the mold opening movement accompanying the operation of the driving device 12B, a mold opening confirmation signal is sent from the controller 12A to the removal mechanism control means 9. Output. The removal mechanism control means 9 outputs a removal operation start signal to the removal mechanism 5 based on the input mold opening limit confirmation signal. Further, the take-out mechanism control means 9 outputs a mold clamping operation prohibition signal or a mold clamping operation permission signal to the controller 12A of the movable mold control means 12. The controller 12A operates to stop or operate the driving device 12B based on the input of the mold clamping operation inhibition signal or the mold clamping operation permission signal.

Next, the automatic removal procedure of the molded article according to the present invention will be described with reference to FIGS. 2 (a) to 2 (j) and 3 (k) to 3 (k).
Description will be made based on (p). (A). A fixed mold 2 attached to a fixed platen 1,
When the movable mold 4 attached to the movable platen 3 is clamped, molten resin is injected into a cavity (not shown) formed by the fixed mold 2 and the movable mold 4, and is formed into a predetermined shape. You. At this time, the gripper 5A of the take-out mechanism
Are waiting at a predetermined waiting position. Here, a mold opening signal is output from the extraction mechanism control means 9 to the movable mold control means 12. (B). The movable mold 4 starts mold opening. (C). 4 by moving the movable mold 4 in the mold opening direction.
When the distance L between the opposing surfaces of the movable mold 4 and the fixed mold 2 becomes the same as the dimension T in the thickness direction of the in-mold advance / retreat portion 5X of the extraction mechanism 5, as shown in FIG. 8 detects and inputs a detection signal to the extraction mechanism control means 9. (D). The unloading mechanism control means 9 outputs the in-mould entry start signal of the in-mould advance / retreat portion 5X to the unloading mechanism 5 in real time based on the signal (c) input from the first detection means 8 and outputs the in-mould advance / retreat. The part 5X is moved forward from a predetermined standby position in the mold. (E). The movable mold 4 reaches the mold opening position. At this point, the in-mould advance of the in-mould advance / retreat portion 5X has already been completed. (F). The gripper 5A reaches a fixed position in the mold based on the numerical control of the take-out mechanism control means 9. (G). An operation start signal is output from the extraction mechanism control means 9 to an actuator for an ejector (not shown). (H). An ejector (not shown) operates. (I). The molded product 6 is made to protrude by the ejector, and the gripping part 5A holds the molded product 6 by suction or mechanically by the operation of the pneumatic device incorporated in the take-out mechanism. That is, the molded product 6 is chucked by the gripping portion 5A. (J). The chucking of the molded product 6 by the grip 5A is confirmed. (K). The gripper 5 is connected to the extraction mechanism 5 from the extraction mechanism control means 9.
An extraction start signal for A is output. (L). The gripper 5A starts the pull-out movement based on the numerical control of the take-out mechanism control means 9. (M). The pull-out movement of the grip 5A is completed. (N). An out-of-mold exit start signal of the in-mold advance / retreat portion 5X is output from the extraction mechanism control means 9 to the extraction mechanism 5.

(O). Based on the numerical control of the take-out mechanism control means 9, the in-mold advance / retreat portion 5X starts retreating out of the mold.
At the same time, the movable die control means 12
The mold clamping signal is output to. The controller 12A of the movable mold control means 12 activates the driving device 12B based on the mold clamping signal input from the takeout mechanism control means 9 to start the mold clamping of the movable mold 4. That is, the movable mold 4 is expectedly started by the output of the next cycle start signal. At this time, the position of the in-mould advance / retreat portion 5X is detected by the second detection means 10 and this detection signal is taken out by the extraction mechanism control means 9
Then, the safety determination circuit of the take-out mechanism control means 9 determines whether or not the movable part 4 is in a position where the in-mold advancing / retracting portion 5X collides with the movable metal mold by continuing the metal mold clamping. As a result, when it is determined that the retreat operation of the in-mold advance / retreat portion 5X is proper and the movable mold 4 is in a safe position where the movable mold 4 does not collide with the movable mold 4 even if the mold is continuously clamped, the ejection mechanism is determined. The control means 9 outputs a mold clamping operation permission signal to the controller 12A of the movable mold control means 12. The controller 12A operates to operate the driving device 12B based on the input permission signal of the mold clamping operation, and continuously performs the mold clamping of the movable mold 4. As a result, the mold is clamped as shown in FIG. In the following, the above procedure is repeated to continuously remove the molded product 6.

(P). On the other hand, since the evacuation operation of the in-mould advance / retreat portion 5X outside the mold is improper, the removal mechanism control that the in-mould advance / retreat portion 5X is at the unsafe position where the movable mold 4 collides with the movable mold 4 by continuing the mold clamping. When the safety judging circuit of the means 9 judges, the removal mechanism control means 9 outputs a signal for inhibiting the mold clamping operation to the controller 12A of the movable mold control means 12. The controller 12A operates to stop the driving device 12B based on the input signal for inhibiting the mold clamping operation, stops the movement of the movable mold 4 in the clamping direction, and activates an alarm device (not shown). Alarm.

As described above, since the movable mold 4 is expectedly started and molded without confirming the completion of the in-mould advance / retreat portion 5X of the take-out mechanism 5 out of the mold, the in-mould advance / retreat portion 5X is formed. Is required to detect the state in which the mold has moved out of the mold, and it is necessary to output a mold clamping signal to the opening / closing mechanism of the movable mold 4 after detecting the state in which the in-mould retreat portion 5X has moved out of the mold. Since no time is required, the molding cycle time can be shortened accordingly. Also,
If the movable mold 4 is expected to be started and the mold is clamped, an unsafe state in which the in-mold advance / retreat portion 5X collides with the movable mold 4 has occurred. It is determined that the movable mold 4 collides with the in-mould advance / retreat portion 5X of the take-out mechanism 5, specifically, the compression damage and fixation of the in-mould advance / retreat portion 5X by both the fixed mold 2 and the movable mold 4. Damage of the mold 2 and the movable mold 4 can be prevented.

In the above-described embodiment, the removal mechanism 5 having a structure in which the in-mould advance / retreat portion 5X moves linearly when the mold is opened has been described. For example, as shown in FIG. The arm 5D rotates around the axis of the shaft 5H, and the gripping portion 5A moves forward and backward in an arc shape.
An extraction mechanism 5 provided with X may be used.

[0021]

As described above, according to the present invention, the movable mold is expected to start the mold clamping without confirming that the in-mould advance / retract portion of the take-out mechanism is completely out of the mold. The time required to detect the state in which the in-mould retreat portion has moved out of the mold and the time required to detect the state in which the in-mould retreat portion has moved out of the mold, and output a mold clamping signal to the opening and closing mechanism of the movable mold. The molding cycle time is reduced. In addition, by starting the movable mold in anticipation and performing mold clamping, even if an unsafe state occurs where the in-mould advance / retreat part collides with the movable mold, this unsafe state is detected and determined. It is possible to prevent a collision between the movable mold and the in-mould retreat portion of the unloading mechanism, specifically, to prevent the compression damage of the in-mould retreat portion and the breakage of both the molds by the fixed mold and the movable mold. it can. Moreover,
By eliminating the need for a mechanical movable mold clamping stop device, it is possible to simplify the structure and reduce the number of mechanical parts.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIGS. 2A to 2J are explanatory views showing the first half of the operation procedure of the present invention.

3 (k) to 3 (p) are explanatory views showing the latter half of the operation procedure of the present invention.

FIG. 4 is an operation explanatory view showing a relationship between movement of a movable mold in a mold opening direction and an in-mould advance / retreat portion.

FIG. 5 is a perspective view showing a modification of the take-out mechanism.

FIGS. 6A to 6J are explanatory diagrams showing the first half of a conventional operation procedure.

FIGS. 7 (k) to (r) are explanatory views showing the latter half of a conventional operation procedure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed platen 2 Fixed mold 3 Movable platen 4 Movable mold 5 Removal mechanism 5A Grasping part of removal mechanism 5X In-mold advance / retreat part of removal mechanism 6 Molded product 8 First detection means 9 Removal mechanism control means 10 Second detection means 12 Movable mold control means

Claims (1)

[Claims] 1. A fixed mold, a movable mold provided in the fixed mold so as to be able to advance and retreat, and forming an injection molding cavity together with the fixed mold, a stop, a clamping movement, and a mold opening of the movable mold. Movable mold control means for controlling the movement, first detection means for continuously detecting the start of movement and the amount of movement of the movable mold, and holding the movable mold to a mold opening position after molding in the cavity. An ejector for projecting a molded product or a molded product held by a fixed mold that has been moved and moved; The movable mold includes: a second detection unit that detects a position of a part; and an extraction mechanism control unit that is electrically connected to the second detection unit and the first detection unit and controls an operation of the extraction mechanism. For control of control means The second detection means detects the position of the in-mould advance / retreat portion of the takeout mechanism immediately after the movable mold has started the mold clamping movement in the fixed mold direction from the open limit position,
It is determined whether or not the in-mould advance / retreat portion is at a position where the movable mold collides with the movable mold by continuing to move in the mold-clamping direction. The control means outputs a prohibition signal of the mold clamping operation to the movable mold control means, and the movement of the movable mold in the clamping direction is stopped by the control of the movable mold control means based on the prohibition signal. An injection molding machine provided with a resin molded product take-out device, which is configured to avoid collision between a mold and a portion of the take-out mechanism that moves in and out of the mold.