JP4264401B2 - Operation control method of injection molding machine - Google Patents

Description

  The present invention relates to an operation control method for an injection molding machine suitable for use in molding a composite molded product through a plurality of molds.

  Conventionally, a plurality of molds are arranged between the movable platen and the fixed platen, and one mold constituting each die is attached to the rotating plate arranged between the movable platen and the fixed platen, and the rotating plate is rotated. An injection molding machine capable of forming a composite molded product by sequentially changing the molds is known from JP-A-10-113963.

This injection molding machine includes a plurality of molds, for example, a primary mold that performs primary molding, a secondary mold that performs secondary molding, and a pair of mold-clamping actuators corresponding to each mold. Each mold is clamped simultaneously by each mold clamping actuator, and after the primary molding is performed by the primary mold, each movable mold is reversed (replaced), and the secondary molding is performed by the secondary mold. Yes, thereby forming a composite (two-color) molded product.
JP-A-10-113963

  However, the conventional injection molding machine for molding a composite molded product has the following problems to be solved.

  First, in this type of injection molding machine, after the mold opening process, a projecting process for releasing the composite molded product is performed, and thereafter, a mold changing process for rotating the rotating disk is performed. The product is discharged to the left side of the machine base through a shooter provided below the secondary mold. For this reason, depending on the installation status of the injection molding machine etc., when discharging the composite molded product from the right side of the machine base, it is necessary to change the shape and mounting position of the shooter, resulting in unnecessary man-hours accompanying changes in the mechanism. However, it is disadvantageous in terms of production efficiency and cost.

  Second, when a molded product take-out robot is attached to an injection molding machine, it will be installed on the left side of the machine base that is close to the secondary mold, but when it is taken out to the right side of the machine base due to factory layout etc. In this case, the moving distance for taking out becomes longer, resulting in an increase in the size of the taking-out robot, an unnecessary increase in power consumption, and an unnecessary increase in occupied space.

  An object of the present invention is to provide an operation control method for an injection molding machine that solves the problems existing in the background art.

  The operation control method of the injection molding machine 1 according to the present invention includes a pair of injection devices 1ia and 1ib installed side by side on the machine base 5 in order to solve the above-described problems, and between the movable platen 2 and the fixed platen 3. Two sets of molds Ca and Cb are arranged, and one mold Cam and Cbm constituting each mold Ca and Cb is attached to a rotating disk 4 arranged between the movable platen 2 and the fixed platen 3. When forming the composite molded product M by sequentially replacing one of the molds Cam and Cbm by rotating, the composite molded product M is replaced after the mold changing process Pr in which the rotary table 4 is rotated to replace the one of the molds Cam and Cbm. The first operation mode D1 for performing the protruding process Pe to be released and the second operation mode D2 for performing the mold changing process Pr after the protruding process Pe are provided. If the first operation mode D1 is selected, the first operation mode D1 is released by the protruding process Pe. Molded composite molded product M in injection direction When the second operation mode is selected while discharging from one (or the other) of the pair of shooters 6a and 6b provided on the right and left sides of the machine base 5, the composite molded product M released from the projecting step Pe is used. Is discharged from the other (or one) of the pair of shooters 6a and 6b.

  In this case, according to a preferred aspect of the invention, in the mold changing process Pr, the simple operation of rotating the rotating disk 4 or the extrusion operation Prp for extruding the rotating disk 4 in the axial direction and the rotating disk 4 after the extrusion operation Prp are rotated. A combined operation Prm including a rotating operation Prc to be performed and a retracting operation Pri to pull the rotating disk 4 in the axial direction after the rotating operation Prc is included.

  According to the operation control method of the injection molding machine 1 according to the present invention by such a method, the following remarkable effects are obtained.

  (1) Easily set (select) whether to discharge the composite molded product M to the left side or the right side of the injection molding machine 1 only by selecting the first operation mode D1 or the second operation mode D2. Can do. As a result, generation of useless man-hours associated with the change in the discharge direction can be avoided, which can contribute to improvement in production efficiency and cost reduction, and can also contribute to improvement in installation property of the injection molding machine 1.

  (2) When a molded product take-out robot is attached to the injection molding machine 1, it can be installed on either the left or right side of the machine base 5, so that the problem that the installation is limited to one side can be solved, and the take-out robot can be downsized. This can contribute to reducing unnecessary power consumption and improving space saving.

  Next, the best embodiment according to the present invention will be given and described in detail with reference to the drawings.

  First, the configuration of the injection molding machine 1 that can implement the operation control method according to the present embodiment will be described with reference to FIGS.

  As shown in FIG. 2, the injection molding machine 1 includes a mold clamping device 1c installed on a machine base 5 and a pair of injection devices 1ia and 1ib installed side by side. The mold clamping device 1c includes a fixed plate 3 fixed in the middle of the machine base 5, a support plate 11 fixed to the end of the machine base 5, and four tie bars installed between the support plate 11 and the fixed plate 3. 12 and a movable platen 2 slidably loaded on each tie bar 12. Each tie bar 12 is arranged at four corners of the movable platen 2 (support platen 11, fixed platen 3) as shown in FIG. Further, as shown in FIGS. 3 and 4, the rotating platen 4 is arranged on the front surface (inner surface) of the movable platen 2 so as to overlap with the rotating platen 4 on the rear surface (outer surface) of the movable platen 2. A turntable rotation drive unit 13 for reverse rotation is provided.

  The rotating disk rotation driving unit 13 is fixed to the back surface of the rotating disk 4 and is coaxially arranged, a servo motor 15 mounted on the rear surface of the movable panel 2, and a rotating shaft of the servo motor 15. The drive gear 16 is engaged with a screw portion 14 n formed on the inner peripheral surface of the ring gear 14. For this reason, an accommodation recess 17 for accommodating the ring gear 14, the drive gear 16 and the like is provided on the front surface of the movable platen 2.

  On the other hand, 18 is a controller incorporating a servo circuit for driving the servo motor 15, and the servo motor 15 is connected to the output part of this servo circuit. A rotary encoder 19 for detecting the rotational speed of the servo motor 15 is attached to the rear end of the servo motor 15, and the rotary encoder 19 is connected to the controller 18. The controller 18 has a computer function for performing various controls and processes. Reference numeral 18d denotes a touch panel display connected to the controller 18, and can perform various settings and displays.

  Further, as shown in FIG. 3, the rotary plate 4 is slightly pushed in the axial direction to be separated from the movable plate 2 and drawn in the axial direction at the center position on the rear surface of the movable plate 2. A turntable advance / retreat drive unit 21 to be contacted is disposed. Ls shown in FIG. 3 indicates a gap generated between the rotary plate 4 and the movable platen 2 when the rotary platen 4 is pushed in the axial direction. The gap Ls indicates the contact between the rotary platen 4 and the movable platen 2. The number [mm] that can be released is sufficient. The turntable advance / retreat drive unit 21 includes an advance / retreat cylinder 22 fixed to the rear surface of the movable platen 2. A piston rod 23 r of a piston 23 built in the advancement / retraction cylinder 22 is inserted into the movable platen 2, and the tip thereof is the turntable 4. Secure to the back of the. Therefore, the piston rod 23r also serves as the rotating shaft of the rotating disk 4. On the other hand, the rear chamber and the front chamber of the advance / retreat cylinder 22 are connected to the hydraulic circuit 24, and the hydraulic circuit 24 is connected to the controller 18 described above. As a result, the hydraulic circuit 24 is controlled by the controller 18.

  Further, as shown in FIGS. 3 and 5, a block-shaped stopper 26 is fixed near the outer periphery of the back surface of the rotating disk 4, and the stopper 26 is moved inside the accommodating recess 17 of the movable panel 2. A pair of stopper receiving portions 27a and 27b are fixed on the locus. As a result, when the turntable 4 rotates in the forward and reverse directions, the stopper 26 abuts against the stopper receiving portions 27a and 27b, and the stopper mechanism 28 that restricts the rotation range of the turntable 4 to 180 [°]. Is configured.

  On the other hand, two movable Cams and Cbm are mounted on the rotary disk 4 at a position facing 180 [°] with respect to the center, and on the fixed disk 3 facing each movable Cam and Cbm. Attach two fixed molds Cac and Cbc. The movable molds Cam and Cbm and the fixed molds Cac and Cbc constitute two sets of molds Ca and Cb. In this case, the movable molds Cam and Cbm constitute one mold Cam and Cbm in the molds Ca and Cb described above. Thus, one fixed mold Cac side is the primary mold Ca, and the other fixed mold Cbc side is the secondary mold Cb. Since each movable type Cam, Cbm is used interchangeably, the symbols Cam, Cbm do not indicate individual movable types, but the movable type facing the fixed type Cac is the primary side movable type Cam. The movable mold facing the fixed mold Cbc is the movable mold Cbm on the secondary side.

  Each of the fixed molds Cac and Cbc includes four guide pins 29..., And each guide pin 29 projects toward the movable molds Cam and Cbm. On the other hand, each movable type Cam, Cbm is provided with guide bushes 30 facing the respective guide pins 29. Thus, in the mold clamping process, the guide pins 29 enter the guide bushes 30 and the movable molds Cam and Cbm and the fixed molds Cac and Cbc are accurately positioned.

  A clamping cylinder 31a is attached to the back surface of the support plate 11 corresponding to the position of the primary mold Ca, and a mold clamping cylinder 31b is attached to the back surface of the support plate 11 corresponding to the position of the secondary mold Cb. Install. The tip of the piston rod that does not appear in the drawings of the mold clamping cylinders 31 a and 31 b is coupled to the movable platen 2. Each mold clamping cylinder 31a, 31b (actuator) is connected to the hydraulic circuit 24 described above. On the other hand, a protruding cylinder 32a is attached to the rear surface of the movable platen 2 corresponding to the position of the primary mold Ca, and a protruding cylinder 32b is attached to the rear surface of the movable platen 2 corresponding to the position of the secondary die Cb. And the front-end | tip of piston rod 32ar ... of each protrusion cylinder 32a, 32b couple | bonds with ejector 33a .... Each protruding cylinder 32a, 32b (actuator) is connected to the hydraulic circuit 24 described above. The hydraulic circuit 24 includes a main pump and a sub pump.

  Further, as shown in FIGS. 2 and 3, a pair of shooters 6a and 6b for discharging the composite molded product M are provided. In this case, one shooter 6a is disposed below the primary mold Ca, and the other shooter 6b is disposed below the secondary mold Cb. Thereby, the composite molded product M dropped on the shooter 6a is discharged to the right side of the machine base 5 with respect to the injection direction, so that it is accommodated in a container (not shown) and dropped on the shooter 6b. Is discharged to the left side of the machine base 5 with respect to the injection direction, thereby being accommodated in a container (not shown).

  Next, a setting screen used for the operation control method according to the present embodiment will be described with reference to FIGS.

  6 and 7 are setting screens displayed on the display 18d. FIG. 6 shows a part of the user setting screen Vu, and FIG. 7 shows a part of the adjustment screen Vc. In the user setting screen Vu shown in FIG. 6, Ka is a mold rotation selection key. When switched to “ON”, the turntable 4 is rotated and the mold rotation selection key Ka is touched to “OFF”. "", The rotating disk 4 is not rotated. Therefore, when switched to “OFF”, it can be used as a single injection molding machine for two units.

  Kb is a rotation mode selection key, which is a “mold rotation → projection” mode that performs a projecting process of releasing the composite molded product M after the mold changing process of rotating the rotating disk 4 and replacing one of the molds Cam and Cbm. (First operation mode D1) and “projection → mold rotation” mode (second operation mode D2) in which the mold changing process is performed after the projecting process can be selected. In this case, if the “projection → mold rotation” mode is selected, the projecting step is performed before the turntable 4 is rotated, so that the released composite molded product M is discharged from the left shooter 6b. If the “mold rotation → projection” mode is selected, the projecting process is performed after the turntable 4 is rotated, so that the released composite molded product M is discharged from the right shooter 6a. Therefore, the rotation mode selection key Kb is used to set (select) the discharge direction of the composite molded product M, that is, to set whether the composite molded product M is discharged to the left side or the right side of the injection molding machine 1. it can.

  Kc is a simultaneous operation selection key. When switched to “ON”, a simultaneous operation (overlap operation) can be executed, and when switched to “OFF”, the simultaneous operation can be canceled. Therefore, if you want to start the protrusion process when the mold opening process is completely finished and the movable platen 2 reaches the mold opening stop position (fully opened position), such as when a molded product removal robot is attached, select the simultaneous operation. The key Kc may be switched to “OFF”.

  Kd is a rotation start position setting key, and when the simultaneous operation selection key Kc is switched to “ON”, it is determined at which timing during the mold opening in the mold opening process the rotation of the rotating disk 4 is started. It can be set by the position (setting position). By using this rotation start position setting key Kd, it is possible to set the optimum (maximum) rotation start timing corresponding to each mold Ca ... from the viewpoint of shortening the molding time. This can be done arbitrarily on the user side. Therefore, if the simultaneous operation selection key Kc is switched to “ON” and the setting position with respect to the movable platen 2 is set by the rotation start position setting key Kd, the operation of the mold changing process is performed as described later. Simultaneous operation can be performed in parallel with the operation.

  In order to prevent the rotating disk 4 from rotating before the guide pins 29 are not completely removed from the guide bushes 30, protective means can be provided if necessary. For example, since the guide pins 29 are not longer than the mold thickness, an allowable setting range from the mold thickness to the mold opening stop position is set in advance, and an alarm is issued when the user inputs beyond the allowable setting range. Protective means such as emitting can be provided. Note that the mold opening stop position (fully opened position) is set to the set value (setting position) of the rotation start position setting key Kd at the time when the simultaneous operation selection key Kc is switched to “ON” in consideration of safety. (Example is 400.0 [mm]).

  On the other hand, in the adjustment screen Vc shown in FIG. 7, Ke is a left rotation limit angle setting key for setting an angle at which the stopper 26 comes into contact with the stopper receiving portion 27b when the turntable 4 rotates leftward. Fine adjustment with respect to the standard value “0.00” can be performed using the rotation limit angle setting key Ke. Kf is a right rotation limit angle setting key for setting an angle at which the stopper 26 abuts against the stopper receiving portion 27a when the turntable 4 is rotated in the right direction. The right rotation limit angle setting key Kf is used as a standard. Fine adjustments to the value “180.00” can be made.

  Kg is an abutting speed setting key for setting a speed when the stopper 26 is abutted against the stopper receiving portion 27a or 27b. When the turntable 4 is rotated, first, it is rotated at the standard speed Vn, temporarily stopped immediately before the stopper 26 hits the stopper receiving portion 27a or 27b, and then rotated at the lowering speed Vs. The stopper 26 is abutted against the stopper receiving portion 27a or 27b. The abutting speed setting key Kg is for setting the abutting speed Vs. The stopper 26 may be temporarily stopped immediately before hitting the stopper receiving portion 27a or 27b, or may be shifted to the hit speed Vs without being temporarily stopped.

  Kh is an abutting deviation allowable range setting key for setting a reference for determining that the stopper 26 has abutted against the stopper receiving portion 27a or 27b by a deviation. Since the turntable 4 is rotated by the servo motor 15 and controlled so as to have a hitting speed Vs by feedback control, when the stopper 26 hits the stopper receiving portion 27a or 27b, the rotation speed becomes zero. Become. As a result, since the deviation of the feedback control system increases rapidly, it can be determined that the stopper 26 has hit the stopper receiving portion 27a or 27b when the deviation reaches the set value. The abutting deviation allowable range setting key Kh is for setting a setting value for this deviation (illustration is the number of pulses from the rotary encoder 19).

  Ki is an acceleration coefficient setting key for setting the acceleration time until the standard speed Vn reaches 0 to 100%, and Kj is a deceleration coefficient setting key for setting the deceleration time until the standard speed Vn reaches 100 to 0%. Each is shown. Km is a zero speed detection threshold setting key for determining whether or not the rotating disk 4 has rotated and reached the target position immediately before the stopper 26 hits the stopper receiver 27a or 27b. Set. In the case of the example, since it is set to 0.10 [%], if the speed is reduced to the standard speed Vn × 0.10 [%], it is determined that the target position has been reached and stopped.

  Kk is a rotation stop monitor setting key for setting a monitor time (for example, 0.10 [second]) for determining when the turntable 4 is stopped due to an abnormality during rotation. Normally, when the turntable 4 rotates to the normal stop position, a stop command signal for stopping the servo motor 15 is output from the controller 18 and, in response, a stop confirmation signal is output from the servo motor 15 side. To do. In this case, if the stop confirmation signal is output from the servo motor 15 within the set monitoring time after outputting the stop command signal, it can be determined that the operation is normal, but if the stop confirmation signal output cannot be confirmed, It is judged that the operation is performed, and abnormal processing such as shutting off the power supply circuit is performed.

  Next, the overall operation of the injection molding machine 1 including the operation control method according to the present embodiment will be described according to the flowchart shown in FIG. 1 with reference to FIGS.

  First, the “mold rotation → projection” mode or the “projection → mold rotation” mode is selected by the rotation mode selection key Kb. In this case, the “mold rotation → projection” mode (first operation mode D1) is a projecting process in which the composite molded product M is released after the mold changing process in which one of the molds Cam and Cbm is replaced by rotating the turntable 4. I do. Therefore, when the released composite molded product M is discharged to the right side of the injection molding machine 1, the “mold rotation → projection” mode (first operation mode D1) may be selected. On the other hand, in the “projection → mold rotation” mode (second operation mode D2), the mold changing process is performed after the projecting process. Therefore, when the released composite molded product M is discharged to the left side of the injection molding machine 1, the “projection → mold rotation” mode (second operation mode D2) may be selected. The simultaneous operation selection key Kc is switched to “ON”, and a predetermined setting position with respect to the movable platen 2 is set by the rotation start position setting key Kd.

  FIG. 9 shows a timing chart (process diagram) of each process in the first operation mode D1 (“mold rotation → projection” mode), and FIG. 10 shows a second operation mode D2 (“projection → mold rotation” mode). The timing chart (process drawing) of each process in is shown. FIG. 8 shows a timing chart of each process in an experimental dry cycle in one molding cycle, that is, in a dry cycle in which the injection process and the metering process are not performed. In the figure, Qc represents a percentage command value with respect to the hydraulic pressure of the main pump provided in the hydraulic circuit 24, and Qp represents a detected hydraulic value of the main pump. Uc represents a percentage command value with respect to the hydraulic pressure of the sub pump provided in the hydraulic circuit 24, and Up represents a hydraulic pressure detection value of the sub pump.

  First, a case where the “mold rotation → projection” mode is selected by the rotation mode selection key Kb will be described.

  Now, it is assumed that the mold clamping device 1c is in the mold open state, that is, the movable platen 2 is in the mold opening stop position (fully opened position). First, the mold clamping cylinders 31a and 31b are driven and controlled, and a mold clamping process Pc including a mold closing process is performed (step S1). In the mold clamping process Pc, the movable platen 2 moves forward from the mold opening stop position (fully opened position), and as shown in FIG. 8, high-speed mold closing Pcf, low-speed mold closing Pcd, and high-pressure mold clamping Pcp are sequentially performed.

  By completing the mold clamping process Pc, the injection process Pm is performed (step S2). In this case, the injection process Pm includes not only the original injection process, but also a metering process and a cooling process, and a nozzle touch process in which the injection devices 1ia and 1ib are advanced to perform nozzle touch, and a pressure release in which pressure is released. A process etc. are also included. In the injection process Pm, as shown in FIG. 9, in the primary mold Ca, primary injection is performed from the injection device 1ia by the primary injection process Pmif, and the primary cooling process Pmcf and the primary weighing process Pmmf are performed by the end of the primary injection process Pmif. Is done. On the other hand, in the secondary mold Cb, secondary injection is performed from the injection device 1ib by the secondary injection process Pmis, and the secondary cooling process Pmcs and the secondary measurement process Pmms are performed by the end of the secondary injection process Pmis. In this case, since the type of resin, the amount of resin, and the like are different between the primary injection and the secondary injection, the entire processing time associated with the primary injection and the secondary injection is also different.

  When the injection process Pm is completed, a mold opening process Po is performed in which the movable platen 2 is moved backward to open the mold (step S3). In the mold opening process Po, the movable platen 2 is retracted from the mold clamping position. When the movable platen 2 is moved back to the mold opening stop position (fully opened position), the movable platen 2 is stopped. Thereby, the mold opening process Po is completed.

  On the other hand, after the start of the mold opening process Po, if the movable platen 2 reaches the set position set in advance, that is, the set position set by the rotation start position setting key Kd, during the mold opening, the mold changing process Pr is performed. Performed (steps S4 and S5). In the mold changing process Pr, the advance / retreat cylinder 22 is first driven and controlled, and the rotating disk 4 is pushed out in the axial direction as shown in FIG. In FIG. 3, Ls indicates a gap generated between the rotary plate 4 and the movable platen 2 when the rotary plate 4 is extruded in the axial direction. Thereafter, the servo motor 15 is driven and controlled, and the rotating disk 4 rotates at the standard speed Vn. Then, when the turntable 4 reaches the stop position (target position), stop processing is performed.

  This stop process is performed as follows. First, the stop position is set immediately before the stopper 26 comes into contact with the stopper receiving portion 27a or 27b. When the stopper 26 reaches this stop position, the stop position is temporarily stopped. Thereafter, the turntable 4 is re-rotated at the low-speed hitting speed Vs, and the stopper 26 hits the stopper receiving portion 27a or 27b. At this time, the rotating disk 4 is controlled by the servo motor 15 so as to have an abutting speed Vs by feedback control. When the stopper 26 hits the stopper receiving portion 27a or 27b, the rotational speed becomes zero, and as a result, the deviation of the feedback control system increases rapidly. Therefore, if the deviation reaches the set value, it can be determined that the stopper 26 has hit the stopper receiving portion 27a or 27b, and therefore stop control (position control) is performed on the servo motor 15. By such stop processing, the stopper 26 can be reliably abutted against the stopper receiving portion 27a or 27b.

  Thereafter, the advance / retreat cylinder 22 is driven and controlled, and the rotating disk 4 is pulled in the axial direction. The position of the turntable 4 shown in FIG. 4 indicates the retracted position, and the turntable 4 is in contact with the movable platen 2. Therefore, as shown in FIG. 8, the exemplary mold changing process Pr includes an extrusion operation Prp for extruding the rotary disk 4 in the axial direction, a rotation operation Prc for rotating the rotary disk 4 after the extrusion operation Prp, and a post-rotation operation Prc. The combined operation Prm includes the pull-in operation Pri that pulls the rotary disk 4 in the axial direction.

  By completing the mold changing process Pr, the protruding process Pe is performed (step S6). In the projecting step Pe, the projecting cylinders 32a and 32b are driven and controlled, and the ejectors 33a... Advance by a predetermined stroke, thereby releasing the composite molded product M adhering to the movable cam (Cbm) and then moving backward. To return to the original position. In this case, after the turntable 4 rotates, that is, after the movable mold Cbm located on the secondary side moves to the primary side, the protruding step Pe is performed, so that the released composite molded product M is the right shooter. It falls to 6a and is discharged to the right side of the machine base 5 (step S7).

  When the protruding process Pe is completed, an intermediate process is performed (step S8). The intermediate process is an interval for stably shifting to the next molding cycle, and this interval can be arbitrarily set on the user side. Therefore, the intermediate process is provided if necessary and is not necessarily provided. As described above, since one molding cycle is completed, when there is another molding, the above-described series of molding operations are similarly repeated (step S9).

  Next, a case where the “projection → mold rotation” mode is selected with the rotation mode selection key Kb will be described.

  In this case, the mold clamping process (step S1), the injection process (step S2), and the mold opening process (step S3) are performed in the same manner as the above-described “mold rotation → projection” mode. However, in the “projection → mold rotation” mode, as shown in FIG. 10, the projecting process Pe is performed when the movable platen 2 reaches a preset position in the middle of mold opening after the mold opening process Po is started. (Step S10). In the projecting step Pe, the projecting cylinders 32a and 32b are driven and controlled, and the ejectors 33a... Advance by a predetermined stroke, thereby releasing the composite molded product M adhering to the movable cam (Cbm) and then moving backward. To return to the original position. Accordingly, since the composite molded product M is released from the movable mold Cbm located on the secondary side before the rotating disk 4 rotates, the released composite molded product M falls on the left shooter 6b, It is discharged to the left side of the machine base 5 (step S11).

  And if the protrusion process Pe is complete | finished, the mold change process Pr will be performed (step S12). As described above, in the mold changing process Pr, first, the advance / retreat cylinder 22 is driven and controlled, and as shown in FIG. 3, an extrusion operation Prp in which the rotating disk 4 is extruded in the axial direction is performed. Thereafter, the servo motor 15 is driven and controlled, and a rotation operation Prc for rotating the turntable 4 is performed. The turntable 4 rotates at the standard speed Vn, and stop processing is performed when the turntable 4 reaches a stop position (target position). Thereafter, the advancing / retreating cylinder 22 is driven and controlled, and a retraction operation Pri is performed in which the rotating disk 4 is pulled in the axial direction. Moreover, the intermediate process mentioned above is performed by complete | finishing the mold change process Pr (step S8). Further, when there is a next molding, a series of molding operations are repeated in the same manner (step S9).

  According to the operation control method according to this embodiment, two different molds Ca and Cb are arranged between the movable platen 2 and the fixed platen 3 and the rotation arranged between the movable platen 2 and the fixed platen 3 is arranged. Basic operation control of molding composite molded product M by attaching movable molds Cam and Cbm constituting molds Ca and Cb to panel 4 and rotating movable disk 4 to sequentially replace movable molds Cam and Cbm. And the discharge direction of the composite molded product M can be easily set by the rotation mode selection key Kb. That is, the composite molded product M is discharged to the left side of the injection molding machine 1 only by selecting the first operation mode D1 (“mold rotation → projection” mode) or the second operation mode D2 (“projection → mold rotation” mode). It is possible to easily set (select) whether to discharge to the right side. As a result, generation of useless man-hours associated with the change in the discharge direction can be avoided, which can contribute to improvement in production efficiency and cost reduction, and can also contribute to improvement in installation property of the injection molding machine 1.

  In particular, when a molded product take-out robot is attached to the injection molding machine 1, it can be installed on either the left or right side of the machine base 5, so that it is possible to eliminate the problem that the installation is limited to one side, and the take-out robot is downsized. This can contribute to reducing unnecessary power consumption and improving space saving.

  In this embodiment, at least a part of the mold change process Pr or at least a part of the protrusion process Pe is simultaneously performed in parallel with the mold opening process Po. As a result, the overall molding time (molding cycle) can be shortened, and production efficiency and mass productivity can be further increased. In addition, since the overall molding time can be shortened without reducing the processing time in each process, it is possible to avoid problems that sacrifice other performance in each process, and to set the processing time in each process. Since it can respond flexibly at that time, other performances and the like can be improved as necessary, such as slightly reducing the rotational speed of the turntable 4 to avoid an increase in the size of the drive system and unnecessary impact. Moreover, since the mold changing process Pr and the mold opening process Po, and the protruding process Pe and the mold opening process Po are simultaneously operated at an arbitrary timing set in advance, the optimum for the molding time corresponding to each mold Ca ( Maximum time).

  In the overlap section Ro shown in FIG. 8, a part of the mold changing process Pr and the mold opening process Po are simultaneously operated in parallel, and only the time Tr shown in FIG. 8 is compared with the conventional operation control method. This shows that the molding time (molding cycle) can be shortened. That is, in FIG. 8, Per indicates the timing of the protruding process performed by the conventional operation control method. In the conventional operation control method, after the mold opening process Po is completed, the mold passes through a predetermined interval Td. Since the process shifts to the replacement process Pr, the time Tr corresponding to the overlap section Ro and the interval Td is longer than that in the present embodiment.

  Although the best embodiment has been described in detail above, the present invention is not limited to such an embodiment, and the detailed configuration, method, quantity, numerical value, and the like do not depart from the spirit of the present invention. It can be changed, added, or deleted arbitrarily.

  For example, the mold changing process Pr includes an extrusion operation Prp for extruding the rotating disk 4 in the axial direction, a rotating operation Prc for rotating the rotating disk 4 after the pushing operation Prp, and a pulling operation for pulling the rotating disk 4 in the axial direction after the rotating operation Prc. Although the combined operation Prm including the operation Pri has been illustrated, it may be a simple operation in which the turntable 4 is simply rotated without performing the extrusion operation Prp and the pull-in operation Pri.

The flowchart for demonstrating the operation control method of the injection molding machine which concerns on the best embodiment of this invention, A plan view including a partially enlarged view of an injection molding machine capable of performing the same operation control method, Configuration diagram at the time of mold opening and extruding operation showing the main part of the same injection molding machine, Configuration diagram at the time of mold clamping and pull-in operation showing the main part of the same injection molding machine, Front view of the rotary table of the same injection molding machine, A screen view showing a part of the user setting screen displayed on the display of the injection molding machine, A screen diagram showing a part of the adjustment screen displayed on the display of the injection molding machine, Timing chart of each process for explaining the operation of the injection molding machine, Timing chart of each process based on the first operation mode in the operation control method, Timing chart of each process based on the second operation mode in the operation control method,

Explanation of symbols

  1: injection molding machine, 1ia: injection device, 1ib: injection device, 2: movable platen, 3: fixed platen, 4: rotating platen, 5: machine base, 6a: shooter, 6b: shooter, D1: first operation mode , D2: second operation mode, M: composite molded product, Ca: mold, Cb: mold, Cam: one mold (movable mold), Cbm: one mold (movable mold), Pr: replacement process, Prp: extrusion operation, Prc: rotation operation, Pri: pull-in operation, Prm: compound operation, Pe: protrusion process

Claims (2)

  It has a pair of injection devices installed side by side on the machine base, and two sets of molds are arranged between the movable platen and the fixed platen, and each mold is placed on the rotary plate arranged between the movable platen and the fixed platen. In an operation control method of an injection molding machine in which one of the constituent molds is attached and the one of the molds is sequentially replaced by rotating the rotating disk to form a composite molded product, the one of the molds is rotated by rotating the rotating disk. A first operation mode for performing a projecting process for releasing the composite molded product after the mold changing process for replacing the mold, and a second operation mode for performing the mold changing process after the projecting process, wherein the first operation mode is If selected, the composite molded product released by the projecting step is discharged from one (or the other) of the pair of shooters provided on the right and left sides of the machine base with respect to the injection direction, and the second operation mode is If selected, the protrusion Operation control method of the injection molding machine, characterized by discharging from said mold release composite moldings pair of the other chute (or one) the extent.   In the mold changing process, a simple operation for rotating the rotating disk, an extrusion operation for extruding the rotating disk in the axial direction, a rotating operation for rotating the rotating disk after the extrusion operation, and the rotating disk after the rotating operation are performed. 2. The operation control method for an injection molding machine according to claim 1, further comprising a composite operation including a pulling operation that is pulled in an axial direction.

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