JP5779901B2 - Mold temperature control device - Google Patents

Description

  The present invention belongs to a technical field relating to a mold temperature control device for controlling the temperature of each of a plurality of divided molds.

  In general, in a molding apparatus such as an injection molding machine, the temperature of a mold is adjusted by a temperature adjusting device in order to ensure the quality of a molded product (see, for example, Patent Document 1). As this temperature control device, a device that allows fluid to flow into the mold is generally used. The temperature of the fluid that flows into the mold is adjusted, and the amount of cooling fluid or heating fluid that flows into the mold is adjusted. By doing so, the temperature of the mold is set to a predetermined constant temperature.

JP-A-9-220750

  By the way, the mold is usually composed of a plurality of divided molds, and the temperature is adjusted for each divided mold. At this time, the target temperature of each divided type is normally set to the same value. This is because if there is a temperature difference between the split dies, a gap will occur between the mating surfaces of the split dies due to the difference in thermal expansion, causing flash on the molded product, or extra force acting on the mating surfaces of the split dies. This is because cracks are likely to occur on the split-type mating surfaces. Therefore, such a problem does not occur if the temperature of each divided type is controlled to be the same target temperature.

  However, even if the target temperature of each split type is set to the same value, the control responsiveness may differ between the split types due to the configuration of the fluid passages in the split type. Due to the difference in property, a temperature difference occurs between the split molds. For example, when the target temperature changes stepwise, when the temperature change rate and the amount of overshoot differ in the split type temperature rise characteristics, or when the target temperature is constant, the split type There are cases where the temperature fluctuation range differs between the split molds, and it is required to minimize the temperature difference due to such a difference in responsiveness.

  The present invention has been made in view of the above points, and the object of the present invention is to minimize the temperature difference between the divided molds of a mold composed of a plurality of divided molds. The purpose is to suppress the deterioration of the quality of the mold and the early deterioration of the mold.

In order to achieve the above object, in the present invention, a plurality of temperature detecting means for detecting the temperature of each divided mold of a plurality of divided molds, and a plurality of temperature detecting means for adjusting the temperature of each divided mold, respectively. And a temperature control device for a mold including a plurality of temperature control units for controlling the operation of the temperature control means for each of the divided molds and executing the temperature control of each of the divided molds. As an object, each of the temperature control units sets a target temperature for each of the divided types, and the detected temperature of the divided type detected by the temperature detecting unit is set to the set target temperature of the divided type. The temperature control of each divided type is performed so that the target temperature is changed so as to change stepwise among the plurality of temperature control units. Detection temperature rise Worst temperature controller characteristic, or, in the case of setting the target temperature constant, the largest temperature controller is the fluctuation width of the detected temperature by the execution of the temperature control is the main control unit, and other temperature control The main control unit sets the target temperature as a predetermined temperature for a first divided type that is a divided type in which the temperature control is executed by the main control unit. it is set to be configured to execute on SL temperature control, the tracking control unit, a second split mold which is split for the temperature control is executed by the follow-up control unit, the target temperature , is set to the temperature detected by the temperature detection means for detecting a temperature of the first split mold, and is configured to perform the above SL temperature control, has a configuration that.

  With the above configuration, since the responsiveness of the temperature control by the tracking control unit is better than the responsiveness of the temperature control by the main control unit, the second split type temperature is controlled by the main control unit by the tracking control unit. It is possible to accurately follow the temperature of one division type, and thereby it is possible to reduce the temperature difference between the first division type and the second division type. Therefore, it is possible to suppress deterioration of the quality of the molded product and early deterioration of the mold.

  In the temperature control apparatus for the mold, during the execution of the temperature control of the plurality of temperature control units, the temperature control unit that becomes the main control unit and the follow-up control unit based on the result of the temperature control before the current time And a temperature control that becomes the main control unit and the follow-up control unit when there is a change in the temperature control unit that becomes the main control unit and the follow-up control unit in response to the decision of the determination unit. It is preferable to include a switching unit that switches the unit to a unit according to the determination.

  As a result, even if the responsiveness changes during the temperature control by the main control unit and the follow-up control unit, the temperature control unit that becomes the main control unit and the follow-up control unit is appropriately switched by the switching means. And the temperature difference between the first split type and the second split type can be continuously maintained at a small value.

  If the said metal mold | die is a resin mold, this invention can be applied suitably, However, It is not restricted to this, For example, a die-cast metal mold may be sufficient.

As described above, according to the mold temperature control device of the present invention, the detection temperature of the temperature control by executing the temperature control when the target temperature is changed so as to change stepwise among the plurality of temperature control units. The temperature control unit with the worst start-up characteristic or the temperature control unit with the largest fluctuation range of the detected temperature due to the execution of temperature control when the target temperature is set constant is the main control unit, and the other temperature control units By using the follow-up control unit, the temperature difference between the divided molds can be made as small as possible to suppress the deterioration of the quality of the molded product, and the life of the mold can be extended.

It is a side view which shows roughly the injection molding machine which has the metal mold | die by which temperature is adjusted by the metal mold | die temperature control apparatus which concerns on embodiment of this invention, and the molding apparatus main body to which this metal mold | die is attached. It is the schematic which shows the structure of the metal mold | die temperature control apparatus which concerns on Embodiment 1. FIG. It is a graph which shows the mode of a change with detection temperature of a fixed type | mold or a movable type | mold with target temperature. It is a flowchart which shows a part of control operation of a controller. It is a flowchart which shows the control operation following FIG. It is a flowchart which shows the control operation following FIG. It is a flowchart which shows the specific example of an injection molding machine driving | operation completion | finish process. FIG. 3 is a view corresponding to FIG. 6 is a flowchart showing a part of a control operation of a controller in the second embodiment. 10 is a flowchart showing a control operation following FIG. 9. It is a flowchart which shows the control operation following FIG. 12 is a flowchart showing a control operation following FIG. It is a flowchart which shows the control operation following FIG. 6 is a flowchart showing a specific example of an injection molding machine operation end process in the second embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 shows an injection having a resin molding die 21 whose temperature is controlled by a mold temperature control device A (see FIG. 2) according to an embodiment of the present invention and a molding machine body 2 to which the die 21 is attached. An outline of the molding machine 1 is shown. The molding machine body 2 includes an injection device 10 that injects molten resin into the cavity 21 c of the mold 21, and a mold clamping device 20.

  The injection apparatus 10 includes a heating cylinder 11 connected to a fixed mold 21a (described later) in the mold 21, and the heating cylinder 11 stores a hopper 12 that stores pellets as a resin material supplied into the heating cylinder 11. Is connected. The pellets supplied from the hopper 12 into the heating cylinder 11 are melted in the heating cylinder 11 by a heater (not shown).

  A screw 13 is provided in the heating cylinder 11 so as to be movable back and forth in the front-rear direction and rotatable, and a rear end portion (right end portion in FIG. 1) of the screw 13 is provided so as to be movable in the front-rear direction. It is supported by the support member 14. A measuring motor 15 such as a servo motor is attached to the support member 14. The rotation of the output shaft of the metering motor 15 is transmitted to the screw 13 via the timing belt 16, and the screw 13 rotates.

  The injection device 10 further includes a screw shaft 17 extending in the front-rear direction in parallel with the screw 13. The rear end portion of the screw shaft 17 is connected to the output shaft of the injection motor 19 via a timing belt 18. On the other hand, the front end portion of the screw shaft 17 is screwed into a female screw portion (not shown) formed in the support member 14. Thus, when the injection motor 19 is driven, the rotation of the output shaft of the injection motor 19 is transmitted to the screw shaft 17 via the timing belt 18, and the rotation of the screw shaft 17 is supported by the screw shaft 17 and the female screw portion. The member 14 is converted into the movement in the front-rear direction, and as a result, the screw 13 moves in the front-rear direction.

  The mold 21 is composed of a plurality of split molds (two split molds in this embodiment). That is, in the present embodiment, the mold 21 includes a fixed mold 21a and a movable mold 21b, and these fixed mold 21a and movable mold 21b are clamped by a mold clamping device 20 as will be described later. A cavity 21c is formed between the mating surfaces. Then, the screw 13 is advanced by the injection motor 19 while being rotated by the metering motor 15, whereby a predetermined amount of molten resin is injected into the cavity 21c. Normally, a plurality of shots are repeatedly performed with one injection of molten resin as one shot, and the time interval between the shots is set to a predetermined time.

  The mold clamping device 20 includes a fixed platen 22 to which the fixed mold 21a is detachably attached, and a movable platen 21b to which the movable mold 21b is detachably attached. The fixed platen 22 and the movable platen 23 are connected to each other by a tie bar 25. The movable platen 23 is configured to be slidable along the tie bar 25, and moves toward and away from the fixed platen 22.

  The mold clamping device 20 further includes a toggle mechanism 27 having one end connected to the movable platen 23 and the other end connected to the toggle support 26. A ball screw shaft 29 is rotatably supported at the center of the toggle support 26. The end of the ball screw shaft 29 on the toggle mechanism 27 side (the right end in FIG. 1) is screwed into a female thread 31 formed on a cross head 30 provided in the toggle mechanism 27. On the other hand, the end of the ball screw shaft 29 opposite to the toggle mechanism 27 (the left end in FIG. 1) is connected to the output shaft of the mold clamping motor 35 via the timing belt 34.

  When the mold clamping motor 35 is driven, the rotation of the output shaft of the mold clamping motor 35 is transmitted to the ball screw shaft 29 via the timing belt 34, and the ball screw shaft 29 and the female screw portion 31 cause the ball screw shaft 29 to rotate. The rotation is converted into a linear movement of the crosshead 30, and the toggle mechanism 27 is activated. By the operation of the toggle mechanism 27, the movable platen 23 moves along the tie bar 25, and mold closing, mold clamping, and mold opening are performed.

  The driving of the metering motor 15, the injection motor 19 and the mold clamping motor 35 is controlled by a controller 40 described later (specifically, an injection molding machine control circuit unit 46 described later), and is controlled by the injection molding machine 1 (mold 21). The product will be molded.

  The mold temperature control apparatus A includes a controller 40 that controls the temperature of the mold 21. The controller 40 is based on a well-known microcomputer, and includes a central processing unit (CPU) that executes a program, a memory that is configured by, for example, a RAM or a ROM and stores a program and data, and various types. And an input / output (I / O) bus for inputting and outputting signals.

  As schematically shown in FIG. 2, cold water and hot water whose temperatures are respectively adjusted to a constant value by the cold temperature control device 51 are supplied into the fixed mold 21a. The supply amount of the hot water to the fixed mold 21a is adjusted by the fixed cold water adjusting valve 52 and the fixed hot water adjusting valve 53, respectively, and the temperature of the fixed mold 21a is adjusted. The cold water and the hot water are also supplied to the movable mold 21b in the same manner as the fixed mold 21a, and the amount of the cold water and the hot water supplied to the movable mold 21b is the movable cold water. The temperature of the movable mold 21b is adjusted by adjusting the regulating valve 54 and the movable warm water regulating valve 55, respectively. Therefore, the fixed cold water adjustment valve 52 and the fixed hot water adjustment valve 53 correspond to temperature adjusting means for adjusting the temperature of the fixed die 21a, and the movable cold water adjustment valve 54 and the movable hot water adjustment valve 55 are movable 21b. It corresponds to a temperature adjusting means for adjusting the temperature of. In FIG. 2, for convenience, the fixed die 21a is shown on the upper side and the movable die is shown on the lower side. Actually, the fixed mold 21a and the movable mold 21b can be a vertical mold as shown in FIG.

  The operation (opening degree) of the fixed cold water adjustment valve 52 and the fixed hot water adjustment valve 53 is controlled by the fixed temperature controller 41 of the controller 40, and the movable cold water adjustment valve 54 and the movable hot water adjustment valve 55 are operated. (Opening degree) is controlled by the movable temperature control unit 42 of the controller 40.

  The fixed mold 21a is provided with a plurality (three in the example of FIG. 2) of fixed mold temperature detection sensors 58 that detect the temperature of the fixed mold 21a. These fixed mold temperature detection sensors 58 are disposed at positions where the temperatures of the fixed mold 21a are greatly different from each other in the vicinity of the bonding surface of the fixed mold 21a with the movable mold 21b. The movable mold 21b is provided with a plurality of (three in the example of FIG. 2) movable temperature detection sensors 59 for detecting the temperature of the movable mold 21b. These movable type temperature detection sensors 59 are arranged at locations where the temperatures greatly differ from each other in the vicinity of the bonding surface of the movable die 21b with the fixed die 21a (parts where the heat capacities differ greatly). The fixed mold and movable mold temperature detection sensors 58 and 59 constitute temperature detection means for detecting the temperature of each divided mold of the mold 21.

  The detected temperatures detected by the plurality of fixed temperature detection sensors 58 are input to the fixed temperature average value calculation unit 43 of the controller 40, and the fixed temperature average value calculation unit 43 detects the detected temperatures of the plurality of parts. The average value of is calculated. The calculated average value is input to the fixed temperature controller 41. The detected temperatures detected by the plurality of movable temperature detection sensors 59 are input to the movable temperature average value calculation unit 44 of the controller 40, and the movable temperature average value calculation unit 44 detects the plurality of parts. The average value of the detected temperatures is calculated. The calculated average value is input to the movable temperature controller 42. In this embodiment, the average value calculated by the movable temperature average value calculator 44 is input as the target temperature of the fixed temperature controller 41.

  The fixed mold temperature control unit 41 controls the operations of the fixed cold water adjustment valve 52 and the fixed hot water adjustment valve 53, and uses the detected temperature (average value) by the fixed mold temperature detection sensor 58 as the target temperature of the fixed mold 21a. In this embodiment, temperature control (feedback control by PID control) is performed. The movable temperature control unit 42 controls the operation of the movable cold water adjustment valve 54 and the movable hot water adjustment valve 55 so that the temperature detected by the movable temperature detection sensor 59 (average value) is the same as that of the movable mold 21b. Temperature control (in this embodiment, feedback control by PID control) is performed so that the target temperature is reached. The target temperatures of the fixed mold 21a and the movable mold 21b will be described later.

  In the present embodiment, the movable temperature controller 42 is a main controller, and the fixed temperature controller 41 is a follow-up controller. The main control unit is a temperature control unit having a worse rising characteristic of the detected temperature due to the execution of the temperature control when the target temperature changes in a step shape among the two temperature control units 41 and 42, or When the target temperature is constant, the temperature control unit has a larger fluctuation range of the detected temperature due to the execution of the temperature control, and the follow-up control unit is the remaining temperature control unit. That is, the responsiveness of the temperature control by the fixed temperature controller 41 (following controller) is better than the responsiveness of the temperature control by the movable temperature controller 42 (main controller). In the present embodiment, the temperature control unit serving as the main control unit and the follow-up control unit is determined in advance from the test results. Thus, as described above, the movable temperature controller 42 is a main controller, and the fixed temperature controller 41 is a follow-up controller.

  The rising characteristic is a characteristic until a predetermined time elapses after the target temperature changes in a step shape. This predetermined time is, for example, as shown in FIG. It is a time (t3 in FIG. 3) or a time close to reaching the target temperature after exceeding the target temperature and exceeding the target temperature.

  Whether the rising characteristic is good or bad is a dead time (t1 in FIG. 3) from when the target temperature changes stepwise until the detected temperature rises, the change rate at the rising of the detected temperature, the target Evaluation is made based on the time (t2) until the target temperature is first reached after the temperature changes stepwise, the overshoot amount (or undershoot amount) with respect to the target temperature, the time t3, and the like. At that time, a weighting coefficient may be set for each item, and each item may be weighted for evaluation.

  The fluctuation range of the detected temperature is determined after a predetermined set time (after t3) after the target temperature changes in a step shape (after t3) and when the target temperature is constant ( The longest possible time is preferable. For example, the evaluation is performed within the range of the continuous operation time of the injection molding machine 1). A value obtained by subtracting the minimum value from the maximum value of the detected temperature within the set time range is defined as the fluctuation range (Tb in the example of FIG. 3).

  The movable type temperature control unit 42 (main control unit) sets the target temperature of the movable type 21b to a predetermined temperature (a control target value during operation described later), and then sets the movable type 21b (first divided type). The temperature control described above is executed.

  On the other hand, the fixed mold temperature control unit 41 (follow-up control unit) sets the target temperature of the fixed mold 21a to a temperature detected by the movable temperature detection sensor 59 (average value), and then sets the fixed mold 21a (second divided mold). The temperature control described above is executed. That is, the fixed mold temperature control unit 41 performs the temperature control so as to follow the temperature of the movable mold 21b whose temperature is controlled by the movable mold temperature control unit.

  The controller 40 includes a fixed temperature controller 41, a movable temperature controller 42, a fixed temperature average value calculator 43, and a movable temperature average value calculator 44, a calendar timer 45, and an injection molding machine control circuit. A unit 46 and a control target value signal generation unit 47 are provided.

  In the memory of the controller 40, the day of the week on which the injection molding machine 1 is operated, the operation start time, and the operation stop time are input and stored in advance. The calendar timer 45 stops the output of the molding machine stop signal and outputs the molding machine operation signal to the injection molding machine control circuit unit 46 when the operation start time of the day of the week when the injection molding machine 1 is operated is reached. To do. This molding machine operation signal output continues until the operation stop time of the same day of the week. When the operation stop time is reached, the molding machine operation signal output is stopped and the molding machine stop signal is controlled by the injection molding machine. Output to the circuit unit 46. The output of the molding machine stop signal continues until the next operation start time of the day of the week when the injection molding machine 1 is operated.

  The injection molding machine control circuit 46 controls the driving of the metering motor 15, the injection motor 19 and the mold clamping motor 35 as described above while the molding machine operation signal from the calendar timer 45 is being input. While the molding machine 1 is operated and the molding machine stop signal is input, the operation of the injection molding machine 1 is stopped. The injection molding machine control circuit unit 46 outputs the same molding machine operation signal to the control target value signal generation unit 47 while the molding machine operation signal from the calendar timer 45 is being input, and the molding machine stop signal. During this time, a similar molding machine stop signal is output to the control target value signal generator 47.

  In addition, an operation time control target value (temperature) and a stop time control target value (temperature) are previously input and stored in the memory. The stop control target value is a temperature lower than the operation control target value. The control target value signal generation unit 47 is configured to input the above-described control target value during operation while the molding machine operation signal from the injection molding machine control circuit unit 46 is being input (when the injection molding machine 1 is being operated). Is output to the movable temperature control unit 42 as a target temperature. The movable temperature controller 42 sets the target temperature of the movable mold 21b to the control target value during operation, and executes the temperature control for the movable mold 21b as described above. Further, when the injection molding machine 1 is in operation, the fixed mold temperature control unit 41 inputs an average value (detected temperature by the movable mold temperature detection sensor 59) calculated by the movable mold temperature average value calculation unit 44. The target temperature of the fixed mold 21a is set to the input average value (detected temperature by the movable temperature detection sensor 59), and the temperature control is executed for the fixed mold 21a as described above.

  Further, the control target value signal generation unit 47 receives the stop control target value while inputting the molding machine stop signal from the injection molding machine control circuit unit 46 (when the injection molding machine 1 is stopped). Is output to the movable temperature control unit 42 as a target temperature. The movable mold temperature control unit 42 sets the target temperature of the movable mold 21b to the control target value at the time of stop, and executes the temperature control for the movable mold 21b as described above. Further, when the injection molding machine 1 is stopped, the fixed mold temperature control unit 41 inputs the average value (the temperature detected by the movable mold temperature detection sensor 59) calculated by the movable mold temperature average value calculation unit 44. The target temperature of the fixed mold 21a is set to the input average value (detected temperature by the movable temperature detection sensor 59), and the temperature control is executed for the fixed mold 21a as described above.

  Here, the control operation of the controller 40 will be described based on the flowcharts of FIGS. In addition, this flowchart is a flowchart which can respond even if any temperature control part becomes a main control part among the fixed-type temperature control part 41 and the movable type temperature control part 42. FIG.

  In the first step S1, it is determined whether or not the start button has been turned ON by the operator's operation. When the activation button is turned on, the following processing operation of the controller 40 is performed, and the processing operation of step S1 is repeated until the activation button is turned on.

  When the start button is turned on and the determination in step S1 is YES, the process proceeds to step S2 where the calendar timer 45 determines whether or not it is the day of the week on which the injection molding machine 1 is operated. When the determination at step S2 is NO, the processing operation at step S2 is repeated, and when the determination at step S2 is YES, the process proceeds to step S3.

  In step S3, it is determined whether or not the calendar timer 45 is a time for operating the injection molding machine 1 (a time between the operation start time and the operation stop time). When the determination at step S3 is NO, the processing operation at step S3 is repeated. When the determination at step S3 is YES, the process proceeds to step S4.

  In step S4, the calendar timer 45 stops outputting the molding machine stop signal, and in the next step S5, the injection molding machine control circuit unit 46 stops outputting the molding machine stop signal.

  In the next step S6, the calendar timer 45 outputs a molding machine operation signal. In the next step S7, the injection molding machine control circuit unit 46 outputs a molding machine operation signal. In the next step S8, a control target value signal. The generation unit 47 outputs an operation time control target value.

  In the next step S9, it is determined whether or not the fixed mold temperature control unit 41 is a main control unit. When the determination in step S9 is NO, the process proceeds to step S18. On the other hand, when the determination in step S9 is YES, the processing operations in steps S10 to S17 are executed in order. In this embodiment, since the movable temperature control unit 42 is the main control unit, the process proceeds to step S18. However, when the fixed temperature control unit 41 is the main control unit, Steps S10 to S17 are executed.

  In step S10, the fixed mold temperature control unit 41 sets the target temperature of the fixed mold 21a to the operation target control value, and in the next step S11, the fixed mold temperature control unit 41 uses the fixed mold temperature detection sensor 58. The detected temperature (average value) is input, and in the next step S12, the fixed temperature control unit 41 uses the control output amount (PID) for setting the detected temperature by the fixed temperature detection sensor 58 to the above-mentioned control target value during operation. Control amount) is calculated, and in the next step S13, the fixed-type temperature control unit 41 outputs the control output amount to the fixed-type cold water adjustment valve 52 and the fixed-type hot water adjustment valve 53.

  In the next step S14, the movable temperature controller 42 sets the target temperature of the movable mold 21b to the temperature detected by the fixed mold temperature detection sensor 58 (average value). In the next step S15, the movable temperature controller 42 inputs the temperature detected by the movable temperature detection sensor 59 (average value), and in the next step S16, the movable temperature control unit 42 converts the temperature detected by the movable temperature detection sensor 58 into the fixed temperature detection sensor. 58, the control output amount (PID control amount) for obtaining the detected temperature is calculated, and in the next step S17, the movable temperature control unit 42 adjusts the control output amount to the movable cold water adjustment valve 54 and the movable hot water adjustment. Output to the valve 55. Thereafter, the process proceeds to step S18.

  In step S18, it is determined whether or not the movable temperature control unit 42 is a main control unit. When the determination at step S18 is NO, the process proceeds to step S27, while when the determination at step S18 is YES, the processing operations of steps S19 to S26 are executed in order. In the present embodiment, the determination in step S18 is YES.

  In step S19, the movable temperature controller 42 sets the target temperature of the movable mold 21a to the control target value during operation. In the next step S20, the movable temperature controller 42 uses the movable temperature detection sensor 59. The detected temperature (average value) is inputted, and in the next step S21, the movable temperature control unit 42 uses the control output amount (PID) for setting the detected temperature by the movable temperature detection sensor 59 to the above-mentioned control target value during operation. In step S22, the movable temperature control unit 42 outputs the control output amount to the movable cold water adjustment valve 54 and the movable hot water adjustment valve 55.

  In the next step S23, the fixed mold temperature control unit 41 sets the target temperature of the fixed mold 21a to the detected temperature (average value) by the movable type temperature detection sensor 59, and in the next step S24, the fixed mold temperature control unit. 41 inputs the temperature detected by the fixed mold temperature detection sensor 58 (average value), and in the next step S25, the fixed mold temperature control unit 41 converts the temperature detected by the fixed mold temperature detection sensor 58 into the movable temperature detection sensor. 59, the control output amount (PID control amount) for obtaining the detected temperature is calculated, and in the next step S26, the fixed-type temperature control unit 41 sets the control output amount to the fixed-type cold water adjustment valve 52 and the fixed-type hot water adjustment. Output to the valve 53. Thereafter, the process proceeds to step S27.

  In step S27, it is determined whether or not a stop button for forcibly stopping the injection molding machine 1 by an operator is turned on. If the determination in step S27 is NO, the process proceeds to step S28. On the other hand, when the determination in step S27 is YES, the process proceeds to step S30.

  In step S28, it is determined whether or not the calendar timer 45 is a time for operating the injection molding machine 1 (a time between the operation start time and the operation stop time). When the determination in step S28 is YES, the process returns to step S9 and the processing operations in steps S9 to S28 are repeated. On the other hand, when the determination in step S28 is NO, the process proceeds to step S29, an injection molding machine operation end process is executed, and then the process returns to step S2.

  Also in step S30 that proceeds when the determination in step S27 is YES, the injection molding machine operation end process is executed, and then the control operation of the controller 40 is ended.

  Details of the injection molding machine operation end processing in steps S29 and S30 will be described based on the flowchart of FIG.

  That is, in step S41, the calendar timer 45 stops outputting the molding machine operation signal, and in the next step S42, the injection molding machine control circuit unit 46 stops outputting the molding machine operation signal.

  In the next step S43, the calendar timer 45 outputs a molding machine stop signal. In the next step S44, the injection molding machine control circuit unit 46 outputs a molding machine stop signal. In the next step S45, a control target value signal. The generation unit 47 outputs the control target value at the time of stop, and then returns.

  When the operation time is reached on the day of the week on which the injection molding machine 1 is operated by the control operation of the controller 40, the movable temperature controller 42, which is the main controller, sets the target temperature of the movable mold 21b as the operation control target value. Then, the temperature control is executed so that the temperature detected by the movable temperature detection sensor 59 becomes the target temperature. By this temperature control, the temperature detected by the movable temperature detection sensor 59 changes as shown in FIG. 3, for example. On the other hand, the fixed mold temperature controller 41 as the follow-up controller sets the target temperature of the fixed mold 21a to the detected temperature by the movable temperature detection sensor 59, and the detected temperature by the fixed mold temperature detection sensor 58 becomes the target temperature. Execute temperature control to reach temperature. By the temperature control of the fixed mold temperature control unit 41, the temperature detected by the fixed mold temperature detection sensor 58 changes in substantially the same manner as the temperature detected by the movable mold temperature detection sensor 59. That is, since the responsiveness of the temperature control by the tracking control unit is better than the responsiveness of the temperature control by the main control unit, the temperature of the fixed mold 21a can be made to accurately follow the temperature of the movable mold 21b. As a result, the temperature difference between the fixed mold 21a and the movable mold 21b can be made as small as possible. Therefore, the deterioration of the quality of the molded product molded by the mold 21 can be suppressed, and the life of the mold 21 can be extended.

(Embodiment 2)
FIG. 8 shows a second embodiment of the present invention in which the configuration of the controller 40 is different from that of the first embodiment. The same parts as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the controller 40 does not predetermine the main control unit and the temperature control unit to be the follow-up control unit from the result of the test, but the controller 40 has the fixed type temperature control unit 41 and the movable type temperature control unit. During the execution of the temperature control of 42, the temperature control unit to be the main control unit and the follow-up control unit is automatically determined from the result of the temperature control before the current time. In response to this determination, when there is a change in the temperature control unit serving as the main control unit and the follow-up control unit, the temperature control unit serving as the main control unit and the follow-up control unit is switched to that according to the determination. For this purpose, the controller 40 is further provided with a master-slave determination / switching unit 61 and first and second switching switches 62 and 63 with respect to those of the first embodiment.

  The first changeover switch 62 switches whether the c terminal connected to the fixed temperature control unit 41 is connected to the a terminal or the b terminal. When the injection molding machine 1 is in operation, the operation time control target value from the control target value signal generator 47 is input to the a terminal of the first changeover switch 62, and the movable temperature detection sensor is input to the b terminal. The detected temperature (average value) 59 is input. When the c terminal is connected to the a terminal, an operation control target value is input as the target temperature of the fixed mold temperature control unit 41, and when the c terminal is connected to the b terminal, the fixed type temperature control unit 41 The detected temperature (average value) by the movable temperature detection sensor 59 is input as the target temperature. Regardless of the first changeover switch 62, the temperature detected by the fixed temperature detection sensor 58 (average value) is always in a state where it can be input to the fixed temperature controller 41.

  The second changeover switch 63 switches whether the c terminal connected to the movable temperature control unit 42 is connected to the a terminal or the b terminal. When the injection molding machine 1 is in operation, the temperature (average value) detected by the fixed temperature detection sensor 58 is input to the a terminal of the second changeover switch 63, and the control target value signal generator is input to the b terminal. The operation control target value from 47 is input. When the c terminal is connected to the a terminal, the temperature detected by the fixed temperature detection sensor 58 (average value) is input as the target temperature of the movable temperature control unit 42, and the c terminal is connected to the b terminal. In some cases, the control target value during operation is input as the target temperature of the movable temperature control unit 42. Regardless of the second changeover switch 63, the temperature detected by the movable temperature detection sensor 59 (average value) is always in the state that can be input to the movable temperature controller 42.

  When the movable temperature controller 42 is a main controller and the fixed temperature controller 41 is a follow-up controller, both the first and second changeover switches 62 and 63 have the c terminal connected to the b terminal. Switch to state. On the other hand, when the fixed temperature control unit 41 is the main control unit and the movable temperature control unit 42 is the follow-up control unit, both the first and second changeover switches 62 and 63 connect the c terminal to the a terminal. Switched to the selected state. Note that the first and second changeover switches 62 and 63 are not limited to hardware, and may be configured by software.

  The first and second changeover switches 62 and 63 are switched by the master-slave determination / switching unit 61. The master-slave determination / switching unit 61 receives a molding machine operation signal and a molding machine stop signal from the injection molding machine control circuit unit 46, and an operation control target value from the control target value signal generation unit 47, a fixed mold The temperature detected by the temperature detection sensor 58 (average value) and the temperature detected by the movable temperature detection sensor 59 (average value) are input. When the molding machine operation signal is input (that is, during the execution of the temperature control of the fixed mold temperature control unit 41 and the movable mold temperature control unit 42), the master-slave determination / switching unit 61 operates the control target value during operation. In addition, from the input information of the detected temperatures by the fixed type and movable type temperature detection sensors 58 and 59, the temperature control unit with the worse rising characteristics or the temperature control unit with the larger fluctuation range is determined as the main control unit. The remaining temperature control unit is determined as the follow-up control unit. That is, the quality of the responsiveness may change during the temperature control, and the temperature of the divided type by the temperature control of the temperature control unit, which is considered to be the responsiveness and the responsiveness is good, The temperature rise characteristic of the split type due to the temperature control of the follow control unit becomes worse than the temperature rise characteristic of the other split type, or the fluctuation range of the split type due to the temperature control of the follow control unit However, it may be larger than the temperature fluctuation range of the other split type. In such a case, the temperature difference between the fixed mold 21a and the movable mold 21b can be continuously maintained at a small value by switching the master-slave relationship of the temperature control unit.

  The master-slave determination / switching unit 61 has previously stored in the memory the quality of the rising characteristics from the time when the control target value signal generation unit 47 starts outputting the control target value during operation. Until the rising characteristic evaluation time (the same time as the predetermined time described in the first embodiment) elapses, the rising characteristic is evaluated, and the temperature control unit to be the main control unit and the tracking control unit is determined. As for the magnitude of the fluctuation range, after the rise characteristic evaluation time has elapsed from the start of the output of the control target value during operation, the fluctuation range is within the time period of the fluctuation width evaluation cycle that has been previously input and stored in the memory ( In this embodiment, instead of a long range such as the set time range described in the first embodiment, the fluctuation range can be accurately evaluated and the master-slave relationship is frequently replaced. The above-mentioned fluctuation range in such a time (for example, several shots to several tens of shots) is evaluated, and the temperature control unit that becomes the main control unit and the follow-up control unit is repeatedly determined in the fluctuation range evaluation period. .

  The master-slave determination / switching unit 61 outputs a switching signal corresponding to the determination to the first and second switching switches 62 and 63. This switching signal is a fixed type main control unit signal having the fixed type temperature control unit 41 as a main control unit (with the movable type temperature control unit as a follow-up control unit), and the movable type temperature control unit 42 as a main control unit. One of the movable main control unit signals (with the fixed temperature control unit as a follow-up control unit). The first and second changeover switches 62 and 63 are both connected to the a terminal by the fixed main control unit signal, and the first and second changeover switches 62 are received by the movable main control unit signal. 63, the c terminal is connected to the b terminal. Then, when there is a change in the temperature control unit that becomes the main control unit and the follow-up control unit (when the signal changes from the fixed main control unit signal to the movable main control unit signal, or vice versa) The state of the first and second changeover switches 62 and 63 is switched by the switching unit 61, and thus the temperature control unit serving as the main control unit and the follow-up control unit is switched to the one according to the determination.

  When the movable temperature control unit 42 is a main control unit and the fixed mold temperature control unit 41 is a follow-up control unit, the fixed type and movable type temperature control units 41 and 42 perform the same temperature control as in the first embodiment. Each will be executed.

  When the fixed mold temperature control unit 41 is the main control unit and the movable mold temperature control unit 42 is the follow-up control unit, the fixed mold temperature control unit 41 sets the target temperature of the fixed mold 21a to the operation control target value. The temperature control is executed for the fixed mold 21a (corresponding to the first divided mold in this case), and the movable mold temperature control unit 42 determines the target temperature of the movable mold 21b by the fixed mold temperature detection sensor 58. The temperature control is executed for the movable mold 21b (corresponding to the second divided mold in this case) by setting the detected temperature (average value). That is, the movable temperature control unit 42 performs the temperature control so as to follow the temperature of the fixed mold 21 a controlled by the fixed mold temperature control unit 41.

  In the present embodiment, the master-slave determination / switching unit 61 constitutes a determination unit that determines a temperature control unit serving as the main control unit and the follow-up control unit, and the master-slave determination / switching unit 61 and the first and second switching switches 62, 63 constitutes a switching means for switching the temperature control unit serving as the main control unit and the follow-up control unit to the one according to the determination by the determination unit.

  Here, the control operation of the controller 40 will be described based on the flowcharts of FIGS.

  In steps S101 to S107, processing operations similar to those in steps S1 to S7 in the flowchart in the first embodiment are performed. In next step S108, the previous injection molding machine operation end process is performed in step S181 (see FIG. 14). The switching signal stored in the memory is read out, and in the next step S109, the switching signal is output to the first and second switching switches 62 and 63. In the next step S110, the control target value signal generating unit 47 is output. Outputs the control target value during operation.

  In the next step S111, the master-slave determination / switching unit 61 reads out the resin gasification temperature previously inputted and stored in the memory, and in the next step S112, the master-slave determination / switching unit 61 previously stores the memory in the memory. The resin plasticizing temperature input and stored in is read out. The resin gasification temperature is a temperature at which the molten resin injected into the cavity 21c is vaporized when the temperature detected by the fixed and movable temperature detection sensors 58 and 59 exceeds the resin gasification temperature. The resin plasticization temperature is such that when the temperature detected by the fixed and movable temperature detection sensors 58 and 59 is lower than the resin plasticization temperature, the molten resin injected into the cavity 21c is rapidly released ( It is the temperature at which it solidifies (before reaching the whole cavity). Normally, the detection temperatures of the fixed and movable temperature detection sensors 58 and 59 are in the range of the above resin plasticizing temperature and below the resin gasification temperature, but analysis and evaluation of rising characteristics described later (see step S123). ) And fluctuation range analysis and evaluation (see step S138), if it is found out of the above range, an alarm is given to the operator that an abnormality has occurred, and the injection molding machine operation end process is executed. (In the flowchart, the processing operation at the time of this abnormality is omitted).

  In the next step S113, the master-slave determination / switching unit 61 reads the rise characteristic evaluation time, and in the next step S114, the fluctuation range evaluation period is read.

  In the next step S115, the master-slave determination / switching unit 61 resets the accumulated value of the rise characteristic evaluation time timer to 0, and in the next step S116, the master-slave determination / switching unit 61 performs the accumulation by the rise characteristic evaluation time timer. In step S117, the master-slave determination / switching unit 61 sets a rising characteristic evaluation completion flag Frag1 that is set to 1 when the rising characteristic evaluation is completed to 0.

  In the next step S118, the master-slave determination / switching unit 61 determines whether or not the rising characteristic evaluation completion flag Frag1 is 0. When the determination in step S118 is NO, the process proceeds to step S129, while step S118. When the determination is YES, the process proceeds to step S119.

  In step S119, the master-slave determination / switching unit 61 takes in the detected temperature (average value) by the fixed temperature detection sensor 58, and in the next step S120, the master-slave determination / switching unit 61 detects by the movable temperature detection sensor 59. The temperature (average value) is taken in, and in the next step S121, the master-slave determination / switching unit 61 takes in the control target value during operation.

  In the next step S122, the master-slave determination / switching unit 61 determines whether or not the rising characteristic evaluation time has elapsed from the integrated value of the rising characteristic evaluation time timer, and when the determination in step S122 is NO While the process proceeds to step S129, when the determination in step S122 is YES, the process proceeds to step S123.

  In step S123, the master-slave determination / switching unit 61 analyzes and evaluates the rise characteristic (t1 in FIG. 3) based on the captured temperatures detected by the fixed and movable temperature detection sensors 58 and 59 and the control target value during operation. , T2, t3, etc.), and in the next step S124, the master-slave determination / switching unit 61 determines whether or not the fixed-type temperature control unit 41 is inferior from the result of the evaluation.

  When the determination in step S124 is NO, the process proceeds to step S126. On the other hand, when the determination in step S124 is YES, the process proceeds to step S125, and the master-slave determination / switching unit 61 sends the fixed-type main control unit signal to the first. Then, the data is output to the second changeover switches 62 and 63, and thereafter, the process proceeds to step S126.

  In step S126, the master-slave determination / switching unit 61 determines whether or not the movable temperature control unit 42 is inferior from the result of the evaluation. If the determination in step S126 is NO, the process proceeds to step S128. On the other hand, when the determination in step S126 is YES, the process proceeds to step S127, where the master-slave determination / switching unit 61 outputs the movable main control unit signal to the first and second switching switches 62, 63, and thereafter. The process proceeds to step S128.

  In step S128, the master-slave determination / switching unit 61 sets the rising characteristic evaluation completion flag Frag1 to 1 and sets the fluctuation range evaluation initialization flag Frag2 to 1. This fluctuation range evaluation initialization flag Frag2 is a flag used for evaluating the fluctuation range in the fluctuation range evaluation period after the rise characteristic evaluation time has elapsed and before the injection molding machine operation end processing is executed. .

  In the next step S129, the master-slave determination / switching unit 61 determines whether or not the rising characteristic evaluation completion flag Frag1 is 1. When the determination in step S129 is NO, the process proceeds to step S144 while step S129 is performed. When the determination is YES, the process proceeds to step S130.

  In step S130, the master-slave determination / switching unit 61 determines whether or not the fluctuation range evaluation initialization flag Frag2 is 1. When the determination in step S130 is NO, the process proceeds to step S134, while in step S130. If the determination is yes, the process proceeds to step S131.

  In step S131, the master-slave determination / switching unit 61 resets the accumulated value of the fluctuation range evaluation cycle timer to 0, and in the next step S132, the master-slave determination / switching unit 61 starts integration by the variation range evaluation cycle timer. In the next step S133, the fluctuation range evaluation initialization flag Frag2 is set to 0.

  In the next steps S134 to S136, processing operations similar to those in steps S119 to S121 are performed, and in the next step S137, the master-slave determination / switching unit 61 evaluates the fluctuation range from the integrated value of the fluctuation range evaluation period timer. It is determined whether or not the period has elapsed. When the determination at step S137 is NO, the process proceeds to step S144, while when the determination at step S137 is YES, the process proceeds to step S138.

  In step S138, the master-slave determination / switching unit 61 analyzes and evaluates the fluctuation range (Tb in FIG. 3) based on the captured temperature detected by the fixed and movable temperature detection sensors 58 and 59 and the control target value during operation. (Evaluation of large and small).

  In the next steps S139 to S143, the same processing operations as those in steps S124 to S127 are executed. In the next step S143, the fluctuation range evaluation initialization flag Flag2 is set to 1.

  In the next steps S144 to S165, processing operations similar to those in steps S9 to S30 in the flowchart in the first embodiment are executed, and after the injection molding machine operation end processing in step S165 is executed, the control operation of the controller 40 is ended. To do.

  As shown in FIG. 14, the injection molding machine operation end process is different from the injection molding machine operation end process in the first embodiment only in step S181, and steps S182 to S186 are steps in the flowchart in the first embodiment. The processing operations are the same as S41 to S45.

  In step S181, the master-slave determination / switching unit 61 stores the switching signal (fixed main control unit signal or movable main control unit signal) at the present time (when the operation of the injection molding machine 1 is finished) in the memory. It is. Since the stored switching signal is output at the start of the next operation (see steps S108 and S109), the temperature control unit serving as the main control unit and the follow-up control unit at the start of the operation is determined by the stored switching signal.

  Then, based on the evaluation result of the rising characteristic after the start of the next operation, when the rising characteristic of the follow-up control unit is worse than the rising characteristic of the main control unit, the master-slave relationship is exchanged. In addition, after the elapse of the rise characteristic evaluation time, the magnitude of the fluctuation range of the detected temperature is evaluated in the fluctuation width evaluation cycle, and even when the fluctuation width by the follow-up control unit is larger than the fluctuation width by the main control unit, Replace master-detail relationship.

  Therefore, in the second embodiment, even if there is a change in the responsiveness during the temperature control by the main control unit and the follow-up control unit, the main control unit and the temperature control unit serving as the follow-up control unit are determined as master-slave. -It can switch appropriately by the switching part 61 and the 1st and 2nd change-over switches 62 and 63, and the temperature difference between the fixed mold | type 21a and the movable mold | type 21b can be continuously maintained at a small value.

  The present invention is not limited to the embodiment described above, and can be substituted without departing from the spirit of the claims.

  For example, in the embodiment described above, the mold 21 is divided into two, but the number of divisions including the slide mold may be any number. A plurality of temperature detecting means for detecting the temperature of each divided mold of the mold 21; a plurality of temperature adjusting means for adjusting the temperature of each of the divided molds; and the temperature adjustment for each of the divided molds. A plurality of temperature control units for controlling the operation of each of the means so that the detected temperature detected by the temperature detecting means becomes the target temperature of the divided type, and the plurality of temperatures Among the control units, the temperature control unit having the worst rising characteristics of the detected temperature due to the execution of the temperature control when the target temperature changes stepwise, or the temperature when the target temperature is constant The temperature control unit with the largest fluctuation range of the detected temperature due to the execution of the control may be the main control unit, and the other temperature control units may be the follow-up control units.

  Moreover, in the said embodiment, although the metal mold | die 21 was a metal mold for resin molding, this invention is applied also to temperature control of this metal mold | die at the time of performing die casting using the metal mold | die for die casting. Can do.

  The above-described embodiments are merely examples, and the scope of the present invention should not be interpreted in a limited manner. The scope of the present invention is defined by the scope of the claims, and all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention is useful for a mold temperature control device that controls the temperature of each divided mold of a plurality of divided molds.

A Mold temperature controller 21 Mold 21a Fixed mold (split mold)
21b Movable type (split type)
40 Controller 41 Fixed type temperature control unit 42 Movable type temperature control unit 52 Fixed type cold water regulating valve (temperature adjusting means)
53 Fixed hot water regulating valve (Temperature adjusting means)
54 Movable cold water regulating valve (temperature regulating means)
55 Movable hot water control valve (temperature control means)
58 Fixed type temperature detection sensor (temperature detection means)
59 Movable temperature sensor (temperature detection means)
61 Master-slave determination / switching unit (decision unit) (switching means)
62 1st changeover switch (switching means)
63 Second changeover switch (switching means)

Claims (3)

A plurality of temperature detecting means for detecting the temperature of each of the divided molds of the plurality of divided molds;
A plurality of temperature adjusting means for adjusting the temperature of each of the divided types;
A mold temperature control device comprising a plurality of temperature control units for controlling the operation of the temperature adjusting means for each of the divided molds, and performing temperature control of the divided molds ,
Each of the temperature control units sets a target temperature for each of the divided types so that the detected temperature of the divided type detected by the temperature detecting unit becomes the set target temperature of the divided type. Configured to perform temperature control of each divided type,
Among the plurality of temperature control units, the temperature control unit having the worst rising characteristics of the detected temperature due to the execution of the temperature control when the target temperature is changed so as to change stepwise, or the target temperature When the temperature is set to be constant , the temperature control unit with the largest fluctuation range of the detected temperature due to the execution of the temperature control is the main control unit, and the other temperature control unit is the follow-up control unit,
The main control unit for the first split mold which is split for the temperature control is executed by the main control unit, the target temperature, set to a predetermined certain temperature, the upper Symbol Temperature Control Configured to run,
The follow-up control unit is configured to detect the target temperature for the second divided type, which is a divided type in which the temperature control is performed by the follow-up control unit, by the temperature detection unit that detects the temperature of the first divided type. It is set to the detected temperature, that the mold temperature control device according to claim being configured to perform above SL temperature control. In the temperature control apparatus of the metal mold according to claim 1,
During execution of the temperature control of the plurality of temperature control units, from the result of the temperature control prior to the current time, a determination unit that determines the temperature control unit to be the main control unit and the follow-up control unit,
In response to the determination by the determination unit, when there is a change in the temperature control unit that is the main control unit and the follow-up control unit, the temperature control unit that is the main control unit and the follow-up control unit is in accordance with the determination. A mold temperature control device characterized by comprising switching means for switching to an object. The mold temperature control apparatus according to claim 1 or 2,
The mold temperature control device, wherein the mold is a mold for resin molding.

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