JP2007021892A - Control device of ejector, control method of ejector and molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the productivity of an ejector. <P>SOLUTION: The control device of an ejector has a state judging means for judging the state of a molding machine, a mode setting means for selecting one of a usual mode for operating the ejector according to usual setting to eject a molded product and a designation mode for operating the ejector according to setting separate from the usual setting to eject the molded product and an ejection means for ejecting the molded product according to the set mode. Since one of the usual mode for operating the ejector according to the usual setting to eject the molded product and the designation mode for operating the ejector according to the setting separate from the usual setting to eject the molded product is selected and set, the molding cycle after the completion of molding in the designation mode can be shortened. Accordingly, the productivity of the ejector can be enhanced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an unloader control device, an unloader control method, and a molding machine.

  Conventionally, in a molding machine, for example, an injection molding machine, a resin heated and melted in a heating cylinder is injected at a high pressure to fill a cavity space of a mold apparatus, and cooled and solidified in the cavity space. Then, a molded product, for example, a disk substrate is taken out.

  The injection molding machine includes the mold device, a mold clamping device, an injection device and the like, the mold device includes a fixed mold and a movable mold, and the mold clamping device includes a fixed platen and a movable platen, By closing and moving the movable platen by driving the mold clamping motor, mold closing, mold clamping and mold opening are performed.

  On the other hand, the injection device includes the heating cylinder that heats and melts the resin supplied from the hopper, and the injection nozzle that injects the molten resin, and a screw can freely advance and retreat in the heating cylinder, and It is rotatably arranged. Then, when the screw is rotated by driving the metering motor during the metering process, the resin is weighed, the resin is stored in front of the screw in the heating cylinder, and the injection motor is driven during the injection process. When the screw is advanced, the resin accumulated in the front is injected and filled into the cavity space of the mold apparatus in a state where the mold clamping is performed.

When the resin in the cavity space is cooled to form a molded product and the mold is opened, the ejector motor of the ejector device is driven, the ejector pin is advanced, the disk substrate is ejected, and the mold is released. Then, the released disk substrate can be grasped and taken out by the take-out machine (see, for example, Patent Document 1).
JP-A-10-113958

  However, in the conventional take-out machine, when the resin state, the temperature of the mold apparatus, etc. are stable, it is easy to take out the disk substrate from the mold apparatus, and the disk substrate can be taken out in a short time. On the other hand, if the state of the resin, the temperature of the mold device, etc. are not stable, as when an injection molding machine is started up, the disk substrate can easily stick to the mold device. It becomes difficult to take out, and it takes a long time to take out the disk substrate.

  Therefore, since the setting of the take-out machine is performed based on the time when the injection molding machine is started up, the molding cycle becomes longer and the productivity of the take-out machine decreases.

  An object of the present invention is to provide an unloader control device, an unloader control method, and a molding machine that can solve the problems of the conventional unloader and improve the productivity of the unloader.

  For this purpose, in the take-out machine control device of the present invention, based on the state judgment processing means for judging the state of the molding machine and the judgment result of the state of the molding machine, the take-out machine is operated at a normal setting to obtain a molded product. Mode setting processing means for selecting and setting one of a normal mode for taking out the product and a designated mode for taking out the molded product by operating the take-out machine differently from the normal setting, and an extraction process for taking out the molded product in the set mode Means.

  According to the present invention, in the take-out machine control device, based on the state determination processing means for determining the state of the molding machine and the determination result of the state of the molding machine, the take-out machine is operated at a normal setting and the molded product is operated. Mode setting processing means for selecting and setting one of a normal mode for taking out the product and a designated mode for taking out the molded product by operating the take-out machine differently from the normal setting, and an extraction process for taking out the molded product in the set mode Means.

  In this case, based on the judgment result of the state of the molding machine, the normal mode in which the take-out machine is operated at the normal setting and the molded product is taken out, and the take-out machine is operated at a setting different from the normal setting to take out the molded product. Since one of the modes is selected and set, the molding cycle after the molding in the designated mode is completed can be shortened. Therefore, the productivity of the unloader can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, a molding machine, for example, an injection molding machine will be described.

  FIG. 1 is a block diagram showing a control circuit of a take-out machine in the first embodiment of the present invention, and FIG. 2 is a perspective view showing an essential part of the injection molding machine in the first embodiment of the present invention.

  In the figure, reference numeral 11 denotes a fixed platen as a first platen. The fixed platen 11 and a toggle support (not shown) as a base plate are arranged to face each other, and four pieces are provided between the fixed platen 11 and the toggle support. Tie bars 12 (in FIG. 2, only two of the four tie bars 12 are shown) are constructed. Further, a movable platen 13 as a second platen is disposed so as to be opposed to the fixed platen 11 and along the tie bar 12, and a toggle mechanism (not shown) is provided between the toggle support and the movable platen 13. Is disposed. When the mold clamping motor 45 as the mold clamping drive unit is driven, the generated rotation is transmitted to the toggle mechanism, and the movable platen 13 is moved forward and backward. The fixed platen 11, the toggle support, the movable platen 13, the toggle mechanism, the mold clamping motor 45, etc. constitute a mold clamping device.

  A fixed mold 15 and a movable mold 16 are attached to the fixed platen 11 and the movable platen 13 so as to face each other, and the fixed mold 15 and the movable mold 16 constitute a mold apparatus.

  Reference numeral 41 denotes a main control unit as a first control unit. The main control unit 41 includes a CPU as an arithmetic unit, and functions as a computer based on various data and performs various processes. Note that an MPU can be used as the arithmetic device instead of the CPU. Reference numeral 42 denotes a memory such as a RAM, a ROM, and a flash memory, 43 denotes an operation unit including operation elements such as switches, keys, and buttons, and 44 denotes a display unit including a display and a lamp. The operation unit 43 and the display unit 44 are disposed on an operation panel (not shown). Moreover, the touch panel which integrated the operation part 43 and the display part 44 can be used.

  In the mold clamping apparatus having the above configuration, when a mold opening / closing processing means (processing section) (not shown) of the main control unit 41 performs mold opening / closing processing and drives the mold clamping motor 45, the toggle mechanism is extended, and the movable platen 13 is extended. Is advanced to close the mold, and the movable mold 16 is brought into contact with the fixed mold 15. Subsequently, when the mold clamping motor 45 is further driven, a mold clamping force is generated in the toggle mechanism, the movable mold 16 is pressed against the fixed mold 15 by the mold clamping force, and the mold clamping is performed. The cavity space is formed between the mold 15 and the movable mold 16. Further, when the mold clamping motor 45 is driven in the reverse direction, the toggle mechanism is bent, the movable platen 13 is retracted, and the mold is opened.

  Then, in a state where the mold clamping is performed, a resin as a molding material is injected from an injection device (not shown), filled in the cavity space, and cooled, whereby a disk substrate as a molded product is molded.

  Subsequently, as the mold opening is performed, in the ejector device (not shown) disposed on the movable platen 13 side, when the projecting motor 46 as the projecting drive unit is driven, the ejector pin is advanced. Then, the disk substrate is ejected and released. At this time, the take-out machine is operated, and the disk substrate is gripped and taken out.

  The unloader is connected to the main control unit 41. The unloader control unit 29 as the second control unit, the movable platen 13, that is, the position detection unit 18 for detecting the position of the movable mold 16, and the disk The position detection unit 18 includes a take-out mechanism 25 for taking out a substrate, and the position detection unit 18 is attached to the encoder 21 attached to the fixed platen 11 and the movable platen 13. The magnetic scale is installed between the fixed platen 11 and the movable platen 13. As the movable platen 13 moves, the magnetic scale 22 is moved relative to the encoder 21, and the encoder 21 continuously detects the position of the movable mold 16 and is detected. The position is sent to the extractor control unit 29. The unloader control unit 29 is composed of a CPU as an arithmetic unit, functions as a computer based on various data, and performs various processes. Note that an MPU can be used as the arithmetic unit instead of the CPU.

  The take-out mechanism 25 includes a base 30 disposed so as to be movable in a direction parallel to the tie bar 12 as a first direction, and a rod-like support member disposed so as to protrude upward from the base 30. 31. A holding member 49 disposed along the support member 31 so as to be movable in a vertical (X-axis) direction as a second direction orthogonal to the first direction, from the holding member 49 to the first The arm member 32 extending in the horizontal (Y-axis) direction as the third direction orthogonal to the second direction, the take-out arm 33 attached to the arm member 32, and the take-out arm 33 A chuck plate 34 as a gripping member attached to the tip of the mold is provided, and the arm member 32, the take-out arm 33 and the chuck plate 34 constitute an in-mold advance / retreat portion 36.

  In order to move the base 30, a servo motor 51 as a first drive unit is provided. In addition, a pneumatic device (not shown) and a servo motor 52 as a second drive unit are disposed in the base 30, and the servo motor 53 as a third drive unit is attached to the holding member 49. A servo motor 54 as a fourth drive unit is disposed on the member 32.

  Therefore, unillustrated unloader operation processing means (processing section) of the unloader control unit 29 performs unloader operation processing and drives the servo motor 51 to move the chuck plate 34 in a direction parallel to the tie bar 12. Then, by driving the servo motor 52, the chuck plate 34 is rotated with respect to the holding member 49, and by driving the servo motor 53, the chuck plate 34 is moved in the vertical direction and the servo motor 54 is driven. Thus, the chuck plate 34 can be moved in the horizontal direction. In addition, 58 is a vacuum pump as a negative pressure source, 61-63 are pipes, 65 is a switching valve, 67 is a pressure sensor as a pressure detector, and 71 is a timer. The unloader control unit 29 constitutes an unloader control device.

  Next, a procedure for taking out the disk substrate from the mold apparatus using the take-out machine having the above-described configuration will be described.

  FIG. 3 is a diagram showing a procedure for taking out the disk substrate in the first embodiment of the present invention.

  In the figure, 11 is a fixed platen, 13 is a movable platen, 15 is a fixed mold, 16 is a movable mold, 25 is a take-out mechanism, 34 is a chuck plate, and d1 is a disk substrate.

  First, in (a), the movable mold 16 is pressed against the fixed mold 15, and a cavity space (not shown) is formed between the fixed mold 15 and the movable mold 16. At this time, the chuck plate 34 stands by at a predetermined position in the vicinity of the mold apparatus, that is, at the retracted position. In this state, when a mold opening signal is sent from the main control unit 41 (FIG. 1) to the mold clamping motor 45, the mold clamping motor 45 is driven and the movable platen 13 is moved backward, as shown in FIG. Thus, mold opening is started.

  Then, as shown in (c), when the movable mold 16 reaches the mold open limit position, the unloader operation processing means sends an in-mold entry start signal to the servo motors 51 to 54, and as a result, the chuck The plate 34 enters between the fixed mold 15 and the movable mold 16 as shown in (d), and then, as shown in (e), the position facing the disk substrate d1, that is, Placed in the operating position.

  Subsequently, as shown in (f), the protrusion processing means (processing section) (not shown) of the main control section 41 performs the protrusion processing and sends a protrusion start signal to the protrusion motor 46, and as a result, not shown. The ejector pin projects the disk substrate d1.

  Next, as shown in (g), the unloader operation processing means drives the servo motor 51 to advance the chuck plate 34 to abut against the disk substrate d1, and to apply the negative pressure from the vacuum pump 58. Send to chuck plate 34. As a result, the chuck plate 34 sucks and holds the disk substrate d1. At this time, the take-out machine operation processing means starts measuring time by the timer 71 at the timing t when the chuck plate 34 is brought into contact with the disk substrate d1.

  The vacuum pump 58 and the chuck plate 34 are connected via pipes 61 to 63 and a switching valve 65. By switching the switching valve 65, the first negative pressure P1 and the first negative pressure are applied. A low negative (high vacuum) second negative pressure P <b> 2 can be sent to the chuck plate 34. Further, the negative pressure supplied to the chuck plate 34 is detected by a pressure sensor 67 as a pressure detection unit disposed in the pipe 61.

  Then, as shown in (h), when the pull-out return waiting time τ1 elapses with the chuck plate 34 being in contact with the disk substrate d1, and the timer 71 finishes counting, the unloader operation processing means As shown in (i), the servo motor 51 is driven in the reverse direction to retract the chuck plate 34, and after being placed at the position shown in (j), it is moved to the retracted position outside the mold. The pull-out return waiting time τ1 generates a suction force sufficient to suck the disk substrate d1 by the negative pressure supplied to the chuck plate 34 while the chuck plate 34 is in contact with the disk substrate d1. When the time required for this is τ0, the time is set longer than the time τ0 by a predetermined margin.

  By the way, when the resin state, the temperature of the mold apparatus, etc. are stable, it is easy to take out the disk substrate d1 from the mold apparatus, whereas the disk substrate d1 can be taken out in a short time. When the state of the resin, the temperature of the mold apparatus, etc. are not stable as when the injection molding machine is started up, the disk substrate d1 tends to stick to the mold apparatus and it is difficult to take out the disk substrate d1. Then, it takes a long time to take out the disk substrate d1, and the molding cycle becomes longer accordingly.

  Therefore, in the present embodiment, a normal mode in which the unloader is operated at a normal setting and the disk substrate d1 is taken out and a designated mode in which the unloader is operated at a setting different from the normal and the disk substrate d1 is taken out are selected. Can be done. Therefore, a state determination processing unit (processing unit) (not shown) of the take-out machine control unit 29 performs a state determination process, reads a predetermined variable, for example, the shot number N in the injection molding machine, and the shot number N is equal to or less than a threshold value Nth. For example, the state of the injection molding machine such as whether the injection molding machine is started up or the molding is stable is determined, and the take-out machine control unit 29 is not illustrated. The mode setting processing means (processing unit) performs mode setting processing, and selects and sets one of the normal mode and the designated mode based on the state of the injection molding machine. In the present embodiment, when the shot number N is equal to or less than the threshold value Nth, it is determined that the injection molding machine is in a started state, the designated mode is set, and when the shot number N is greater than the threshold value Nth, molding is performed. Is determined to be stable, and the normal mode is set.

  Therefore, the unloading processing means (processing unit) (not shown) of the unloader control unit 29 performs the unloading process, and operates the unloader with different settings depending on whether the set mode is the normal mode or the designated mode. . That is, when the set mode is the designated mode, the take-out processing means performs an operation different from the normal mode, for example, after a sufficient time has elapsed after the chuck plate 34 is brought into contact with the disk substrate d1. The disk substrate d1 is taken out by this operation.

  For this purpose, the display processing means (processing unit) (not shown) of the main control unit 41 performs display processing, and the display unit 44 has a first extraction setting input screen for operating the unloader in the normal mode, and a designation mode. The second take-out setting input screen for operating the unloader is formed, and the withdrawal return waiting time τ1 can be set longer than the normal mode setting on the second take-out setting input screen. ing.

  FIG. 4 is a diagram showing a part of an extraction setting input screen according to the first embodiment of the present invention.

  In the figure, AR13 is an area for changing the setting of the take-out machine according to the state of the injection molding machine and setting the designated mode. In the area AR13, a frame k11 for inputting a threshold Nth of the number N of shots for operating the take-out machine in the designated mode, and a frame for entering the withdrawal return waiting time τ1 during operation of the take-out machine in the designated mode k12 is formed. Therefore, when the operator operates the operation unit 43 (FIG. 1) and inputs the threshold value Nth and the withdrawal return waiting time τ1, the setting change processing means (not shown) of the unloader control unit 29 performs the setting change processing and inputs The take-out machine is set with the threshold value Nth and the withdrawal return waiting time τ1.

  Thus, in this embodiment, when the injection molding machine is started up, the take-out machine is operated in the designated mode until the predetermined number of shots are molded, and the withdrawal return waiting time τ1 has elapsed. Since the disk substrate d1 is taken out and thereafter the unloader is operated in the normal mode, the molding cycle after the molding in the designated mode is completed can be shortened. Therefore, the productivity of the unloader can be improved.

  In the present embodiment, the setting change processing means makes the withdrawal return waiting time τ1 longer in the designated mode than the setting in the normal mode. However, in the designated mode, the negative pressure supplied to the chuck plate 34 The suction confirmation pressure for judging whether or not the value is sufficient to suck the substrate d1 is set lower than the normal mode setting (in the negative direction) or the negative pressure generated in the vacuum pump 58 is changed. Then, the negative pressure supplied to the chuck plate 34 is set lower (higher in the negative direction) than the normal mode setting, or the negative pressure supplied to the chuck plate 34 by switching the switching valve 65 is set lower than the normal mode setting. (Higher in the negative direction), the stroke of further advancing after the chuck plate 34 is brought into contact with the disk substrate d1 is made longer than the normal mode setting, or the chuck plate 34 The pressing force when in contact with the disk substrate d1, or can be higher than the set in the normal mode.

  In the present embodiment, in the take-out machine control unit 29, the state determination processing means reads the number of shots N and determines the state of the injection molding machine depending on whether the number of shots N is equal to or less than a threshold value Nth. However, the main control unit 41 can determine the state of the injection molding machine. In that case, a state determination processing means (processing unit) (not shown) of the main control unit 41 performs a state determination process, determines the state of the injection molding machine depending on whether the shot number N is equal to or less than the threshold value Nth, and determines the determination result. I / O is output to the unloader controller 29 as a status signal. Therefore, in the unloader control unit 29, the mode setting processing means reads the status signal and sets the mode. Furthermore, the determination result of the state of the injection molding machine can be sent from the main control unit 41 to the unloader control unit 29 as a status signal by communication.

  Also, in the injection molding machine, when the molding cycle is lengthened as necessary, the resin state, the temperature of the mold apparatus, etc. are not stable, and the disk substrate d1 is easily stuck to the inner peripheral surface of the cavity space. It becomes difficult to take out the disk substrate d1 from the mold apparatus. Therefore, the mode setting processing means can set the designated mode even when the molding cycle is long in the injection molding machine.

  In addition, when an error in taking out the disk substrate d1 occurs, the injection molding machine may be stopped for a short period of time, but when the operation of the injection molding machine is resumed after that, the state of the resin, the mold apparatus The temperature or the like is not stable, the disk substrate d1 is likely to stick to the inner peripheral surface of the cavity space, and it becomes difficult to take out the disk substrate d1 from the mold apparatus. Therefore, when the injection molding machine is stopped for a short period and the operation is resumed, the mode setting processing means can set the designated mode.

  Further, in the present embodiment, the state determination processing means determines the state of the injection molding machine by comparing the number of shots N with a threshold value Nth, but the operator visually checks the state of the injection molding machine. And the mode can be set by operating the operation unit 43. In this case, a button is provided on the operation unit 43 or a key is provided on a setting screen formed on the display unit 44, and the state determination processing unit presses the button or touches the key. The state of the injection molding machine is determined depending on whether or not it has been done.

  FIG. 5 is a perspective view showing a main part of an injection molding machine according to the second embodiment of the present invention. In addition, about the thing which has the same structure as 1st Embodiment, the description is abbreviate | omitted by providing the same code | symbol, and the effect of the same embodiment is used about the effect of the invention by having the same structure. .

  In the figure, 81 is a take-out machine, 82 is an arm member disposed so as to be swingable about a swing shaft sh 1, and 83 is a chuck plate as a gripping member attached to the tip of the arm member 82.

  In this case, the arm member 82 is swung by driving a servo motor (not shown) as a drive unit for taking out, and accordingly, the chuck plate 83 is moved to a retracted position in the vicinity of the mold apparatus, and to the illustration. An operating position opposite to the disk substrate that is not to be taken is adopted.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

It is a block diagram which shows the control circuit of the take-out machine in the 1st Embodiment of this invention. It is a perspective view which shows the principal part of the injection molding machine in the 1st Embodiment of this invention. It is a figure which shows the taking-out procedure of the disc substrate in the 1st Embodiment of this invention. It is a figure which shows a part of extraction setting input screen in the 1st Embodiment of this invention. It is a perspective view which shows the principal part of the injection molding machine in the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Fixed platen 13 Movable platen 15 Fixed metal mold 16 Movable metal mold 18 Position detection part 25 Unloading mechanism 29 Unloader control part 34, 83 Chuck plate 41 Main control part 44 Display part 45 Mold clamping motor AR13 Area | region d1 Disk substrate

Claims (8)

(A) state determination processing means for determining the state of the molding machine;
(B) Based on the determination result of the state of the molding machine, the normal mode in which the take-out machine is operated at a normal setting to take out the molded product, and the take-out machine is operated at a setting different from the normal to take out the molded product. Mode setting processing means for selecting and setting one of the designated modes,
(C) A take-out machine control device comprising take-out processing means for taking out a molded product in a set mode.   The unloader control device according to claim 1, wherein in the designated mode, the withdrawal return waiting time is set longer than the setting of the normal mode.   The suction confirmation pressure for determining whether or not the negative pressure supplied to the gripping member is a value sufficient to suck the molded product in the designated mode is lower than the normal mode setting. The unloader control device described.   The unloader control device according to claim 1, wherein, in the designated mode, the negative pressure supplied to the gripping member is set lower than the normal mode setting.   The unloader control device according to claim 1, wherein in the designated mode, a stroke for further advancement after the gripping member comes into contact with the molded product is longer than a setting in the normal mode.   The unloader control device according to claim 1, wherein in the designated mode, the pressing force when the gripping member comes into contact with the molded product is set higher than the setting in the normal mode. (A) Determine the state of the molding machine,
(B) Based on the determination result of the state of the molding machine, the normal mode in which the take-out machine is operated at a normal setting to take out the molded product, and the take-out machine is operated at a setting different from the normal to take out the molded product. Select and set one of the designated modes
(C) A take-out machine control method, wherein a molded product is taken out in a set mode. (A) a display unit;
(B) A first take-out setting input screen for inputting unloader settings in the normal mode and a second take-out setting input screen for inputting unloader settings in the designated mode are formed on the display unit. Display processing means for
(C) The molding machine characterized in that an area for changing the setting of the take-out machine is formed on the second take-out setting input screen in accordance with the state of the molding machine.

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