JP4648076B2 - Control device for injection molding machine - Google Patents

Description

  The present invention relates to a control device for an injection molding machine, and more particularly to a control device capable of statistical processing of measurement data.

  The injection molding machine melts the synthetic resin material put into the barrel from the hopper by heating with a heater, extrudes this molten resin forward by the rotation and advance operation of the injection screw provided in the barrel, and further melts in the barrel After weighing the resin, it operates to inject from the injection nozzle into the mold. At this time, the mold is closed and held by the mold opening / closing mechanism and filled with the molten resin to be injected. Thereafter, the mold is separated from the injection nozzle, released from the mold opening / closing mechanism, and the molded product is taken out from the mold.

  The control device for controlling such an injection molding machine has a time for filling a mold with a molten resin, a time for measuring a molten resin in a barrel, a time for taking out a molded product with a mold, Monitors and measures the cycle time for molding one molded product, stores the measured data obtained for a predetermined number of molded products in the storage unit, and stores the stored measurement data, for example, a human machine interface comprising a personal computer To be displayed on the display section.

However, simply displaying the measurement data stored in the storage unit is insufficient to manage the quality of the molded product by the injection molding machine.
Therefore, the present invention can display two types of statistical data depending on whether or not the number of the target molded products and the statistical data are to be confirmed immediately, and can perform quality control at the time of molding the molded product. Provided is a control device for an injection molding machine which can be sufficiently enhanced.

The present invention relates to an injection molding machine in which a synthetic resin material is heated and melted in a barrel and weighed and injected into a mold from an injection nozzle to form a molded product. Measuring means for measuring monitoring objects such as filling time, molten resin measurement time in the barrel, removal time of the molded product in the mold, cycle time required to mold one molded product, Measurement data control means for performing control to store the measurement data for each monitoring target measured by the measurement means in the storage unit for a preset number of moldings, a display unit for screen display, and a range of molding numbers stored in the storage unit When there is a first instruction means for setting the number of statistical objects and instructing the display of statistical data, and when there is an instruction to display the statistical data by the first instruction means, the total number of statistical objects set from the storage unit First statistical data output means for reading out data, calculating desired statistical data, and outputting the calculated statistical data for display on the display unit, and molding without using measurement data in the storage unit When there is a second instruction means for instructing the display of statistical data using the measurement data of the molded article, and there is an instruction to display the statistical data by the second instruction means, the measurement data for each monitoring target measured by the measurement means Statistical data control means for performing control for immediately calculating desired statistical data and storing it in the storage section; and second statistical data output means for outputting the statistical data from the storage section and outputting it for display on the display section , The first statistical data output means and the second statistical data output means display statistical data in a trend format on the display unit within a range of a desired number of moldings. That the control apparatus for an injection molding machine.

  According to the present invention, the number of statistical objects can be set within the range of measurement data for the number of moldings stored in the storage unit, statistical data can be calculated and displayed on the display unit, and measurement data in the storage unit is not used. The statistical data is immediately calculated from the measurement data of the molded product to be molded and stored in the storage unit, and the statistical data can be read out from the storage unit and displayed on the display unit. Provides an injection molding machine controller that can display two types of statistical data depending on whether you want to immediately check the quantity and statistical data, and can also enhance the quality control during molding of molded parts. it can.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. This embodiment will be described as applied to a control device for an electric injection molding machine.
FIG. 1 is a diagram showing the configuration of an electric injection molding machine. An injection molding machine main body 1 has an injection screw 4 inserted into a cylindrical barrel 3 provided with a hopper 2 so as to be rotatable and movable back and forth. Yes. A rear portion of the barrel 3 communicates with the hopper 2, and a synthetic resin material is supplied from the hopper 2.

  A plurality of heaters (not shown) are arranged on the outer periphery of the barrel 3 at a predetermined interval so as to melt the charged synthetic resin material by heating the outer periphery of the barrel. An injection nozzle 5 for injecting molten resin is formed at the tip of the barrel 3. The temperature of the barrel 3 is controlled so that the melting degree of the molten resin gradually increases toward the tip.

  The injection screw 4 is rotationally driven by an injection servo motor 6 and moves back and forth. That is, the rotational driving force of the injection servo motor 6 is transmitted to a ball screw shaft 11 rotatably disposed on the servo bracket 10 via a transmission mechanism including a pulley 7, a timing belt 8 and a timing pulley 9. It is configured. A ball nut 12 is screwed onto the ball screw shaft 11, and the ball nut 12 is bolted to the thrust box 13. Furthermore, the rear end portion of the injection screw 4 is coupled to the thrust box 13 via an S shaft and a bearing (not shown) that are rotatably provided.

  A timing pulley 14 is coupled to the S shaft rotatably coupled to the thrust box 13, and a measuring servo motor 17 is coupled via a transmission mechanism including the timing pulley 14, the timing belt 15, and the pulley 16. The rotational driving force of the measuring servo motor 17 is transmitted to the S axis via a transmission mechanism. Thereby, the rotation of the measuring servo motor 17 is transmitted as a rotation for causing the injection screw 4 to perform a measuring operation.

  In front of the barrel 3, a mold 18 and a device 19 for opening / closing and clamping the mold 18 are arranged. The tip 4 a of the injection screw 4 moves forward in the barrel 3 when the injection nozzle 5 formed at the tip of the barrel 3 is pressed against the nozzle port 18 a of the mold 18. The generated molten resin is injected from the injection nozzle 5 and filled into the mold cavity 20.

  The device 19 for opening and closing and clamping the mold 18 is provided with a movable plate 23 that supports the other of the mold 18 via a tie bar 22 in a movable manner with respect to the fixed plate 21 that supports one of the mold 18. In addition, the movable platen 23 is attached to the toggle mechanism support plate 25 via a toggle type clamping mechanism 24. A mold clamping servomotor 26 for driving the toggle mold clamping mechanism 24 is attached to the toggle mechanism support board 25. A mold thickness adjusting mechanism 27 adjusts the mold thickness by the toggle type mold clamping mechanism 24.

  In this electric injection molding machine, first, the mold clamping servomotor 26 is driven to start the mold 18 closing, and the injection nozzle 5 of the barrel 3 is pressed against the nozzle port 18 a of the mold 18. Next, the metering servo motor 17 is driven to measure the molten resin to be injected, and then the injection servo motor 6 is driven to advance the injection screw 4 to perform injection filling of the molten resin into the mold cavity 20. .

  As shown in FIG. 2, the control device for the electric injection molding machine main body 1 includes a CPU, a ROM, and a RAM, and includes a main control unit 31 that manages and monitors the injection molding machine main body and controls each part. ing. Further, it has a CPU, ROM and RAM, and has a sequence processing unit 32 for controlling the operation sequence of the injection molding machine main body, and has a CPU, ROM and RAM, and controls the injection servo motor 6 and the metering servo motor 17. A servo command unit 33 is provided. The main control unit 31, sequence processing unit 32, and servo command unit 33 are electrically connected to each other by a bus line 34.

  The servo command unit 33 controls the servo amplifier 35 to drive the injection servo motor 6. The rotation and current value of the injection servo motor 6 are detected by the detection unit 36. The servo command section 33 receives a detection signal from the detection section 36, detects the movement position, rotation speed, and motor current value of the injection screw 4, and performs feedback control for controlling the injection servo motor 6 based on the detected position. .

The servo command unit 33 controls the servo amplifier 37 to drive the measuring servo motor 17. Then, the rotation and current value of the measuring servo motor 17 are detected by the detection unit 38. The servo command unit 33 receives a detection signal from the detection unit 38, detects the movement position, rotation speed, and motor current value of the injection screw 4, and performs feedback control to control the measuring servo motor 17 based on the detected position. .
An I / O 40 and the like are electrically connected to the sequence processing unit 32 via an I / O bus 39.

  The main control unit 31 includes a communication interface unit. An HMI (human machine interface) unit 41 having a CPU, a ROM, a RAM, and a general-purpose OS (operating system) is connected to a LAN 42 such as Ethernet (registered trademark). Connected by. The HMI unit 41 is composed of, for example, a personal computer, and is connected to a display unit of a display unit 43 with a touch panel in which a touch panel is arranged on a liquid crystal display screen, and controls the display unit.

  Further, the main control unit 31 connects an operation panel unit 44 provided with a plurality of mechanical operation switches by a cable 45, and connects a touch panel of the display unit with a touch panel 43 by a cable 46. A temperature control unit 47 that controls the temperature of the barrel by a heater disposed on the outer peripheral portion of the barrel 3 is connected by a cable 48.

  As shown in FIG. 3, the HMI unit 41 communicates with the main control unit 31 via a CPU 51 constituting a control unit main body, a ROM 52 storing program data, a RAM 53 provided with a memory used for data processing, and the LAN 42. A non-volatile storage medium such as a compact flash (registered trademark) card or a hard disk storing a communication interface (I / F) 54 for performing display, a display controller 55 for controlling display of the display unit 43 with a touch panel, a general-purpose OS, etc. A storage medium interface (I / F) 58 that communicates data with this external storage medium 57 is provided by connecting to the storage device 56 and an external storage medium 57 such as an optical disk, and electrically connected to each other via a bus line 59. ing. The storage device 56 is formed with a storage unit that stores measurement data and statistical data statistically processed based on the measurement data.

  The display unit with touch panel 43 is display-controlled by the HMI unit 41 via the display controller 55. And the key signal by the touch panel operation of the said display part 43 with a touch panel is the structure input into the said main control part 31, The signal required by the HMI part 41 among the input key signals in the main control part 31 is comprised. The data is transmitted to the HMI unit 41 via the LAN 42.

  As shown in FIG. 4, the main control unit 31 uses the CPU 3, the ROM, and the RAM to fill the mold 18 (in the mold cavity 20) with the molten resin every time the molded product is molded. The measuring means 311 for measuring the measurement time of the molten resin, the taking-out time of the molded product with the mold 18, the cycle time required for molding one molded product, the holding pressure, etc., and the measuring means 311 Measurement data control means 312 for controlling output to the HMI unit 41 in order to store in the storage unit of the storage device 56 the measurement data for each monitoring target measured by the storage unit 56, and the storage of the storage device 56 The first instruction means 313 for setting the statistical object number within the range of the molding number stored in the unit and instructing the HMI unit 41 to display the statistical data, and the total of the storage unit of the storage device 56 The second instruction means 314 for instructing the HMI unit 41 to display the statistical data using the measurement data of the molded product to be molded without using the data, and the statistical data by the second instruction means 314 When there is a display instruction, statistics for performing output control to the HMI unit 41 in order to calculate desired statistical data from the measurement data for each monitoring target measured by the measurement unit 311 and store it in the storage unit of the storage device 56. Data control means 315 is provided. The first and second designation means 313 and 314 also use the touch panel of the display unit 43 with a touch panel.

  The measuring means 311 measures the charging time, the metering time, the take-out time, and the cycle time individually using a timer, and measures the holding pressure using a pressure gauge. It comes to measure by the method.

  As shown in FIG. 5, the HMI unit 41 uses the CPU, ROM, and RAM to measure the measurement data from the time measuring unit 411 that measures the year / month / day time in seconds and the measurement data control unit 312 of the main control unit 31. When received, the measurement data storage means 412 stores the date, time, and date recorded by the time measuring means 411 in the storage unit of the storage device 56, and the display of statistical data from the first instruction means 313 of the main control unit 31. When there is an instruction, in order to read the measurement data for the number of statistical objects set from the storage unit of the storage device 56 and calculate desired statistical data, and to display the calculated statistical data on the display unit 43 with a touch panel The first statistical data output means 413 to output and the year when the time measuring means 411 counts when receiving statistical data from the statistical data control means 315 of the main control unit 31 Statistical data storage means 414 for storing the date and time in the storage unit of the storage device 56, and when the statistical data stored in the storage unit of the storage device 56 reaches the set number of moldings, the storage unit of the storage device 56 Second statistical data output means 415 for reading out the statistical data and outputting it for display on the display unit 43 with a touch panel.

  In such a configuration, when molding a molded product, the touch panel is operated to select the molding condition setting while the screen for selecting the molding condition setting is displayed on the display unit of the display unit 43 with a touch panel. Then, a screen for setting molding conditions is displayed on the display unit. Then, the operator operates on this setting screen, and sets and confirms the molding conditions prior to the injection molding work.

  When the setting of molding conditions is completed, the injection molding machine main body 1 is controlled to start injection molding. In the injection molding, the main control unit 31 controls the temperature control unit 47 to melt the synthetic resin material put into the barrel 3 from the hopper 2 by heating with a heater, and controls the sequence processing unit 32 and the servo command unit 33. To do. Thus, first, the metering servo motor 17 is driven to move the injection screw 4 to measure the amount of molten resin to be injected. Next, the injection servo motor 6 is driven to advance the injection screw 4, and the molten resin is extruded to the injection nozzle 5 at the tip 4 a. As a result, the molten resin is injected from the injection nozzle 5 into the nozzle port 18 a of the mold 18 and filled in the mold cavity 20. When the filling is completed, the device 19 for opening / closing and clamping the mold 18 is operated to separate the mold 18 from the barrel 3 and to open the mold 18, and the molded product is taken out. A single molded product is molded as one shot, and molding is repeated with the time required for this one shot as a cycle time.

  In each cycle, the measurement means 311 of the main control unit 31 allows the molten resin filling time in the mold 18, the molten resin measurement time in the barrel 3, the removal time of the molded product in the mold 18, the cycle time, and the holding pressure. Pressure etc. are measured. Measurement data such as charging time, metering time, take-out time, cycle time, holding pressure, etc. when molding one molded product is used as one shot of measurement data, and the measured data in units of molded products, that is, shot units. Is output to the HMI unit 41 by the measurement data control means 312. In the HMI unit 41, when one shot of measurement data is received, the measurement data storage unit 412 attaches the year / month / day time counted by the time measuring unit 411 and stores it in the storage unit of the storage device 56. In this way, measurement data for each shot is stored in the storage device 56 every time molding of the molded product is repeated. And the memory | storage part of the memory | storage device 56 is set to the capacity | capacitance which memorize | stores the measurement data for 1000 shots, and when the measurement data for 1000 shots are memorize | stored in a memory | storage part, after that, the oldest measurement data will be erased. After that, new measurement data is stored.

  In such a molding operation, for example, when L statistics are selected and 3000 shots from the current shot (2001 shot) to 5000 shots are monitored, and statistical data is to be viewed based on the measurement data, a display with a touch panel is provided. The touch panel of the unit 43 is operated to display the L statistics as shown in FIG. 6 on the display unit. Then, when the sample number “3000” shot is input on the screen and the start key A is operated, the second instruction unit 314 of the main control unit 31 performs statistical data on the HMI unit 41 from the 2001th shot to the 5000th shot. The display instruction is given.

  At this time, the main control unit 31 operates the statistical data control unit 315 to calculate desired statistical data from the measurement data of the molded product measured by the measurement unit 311 and store it in the storage unit of the storage device 56. The output control to 41 is performed. When the HMI unit 41 receives the statistical data from the statistical data control unit 315, the statistical data storage unit 414 attaches the statistical data to the date and time of the time counted by the clocking unit 411, and stores one-shot statistical data in the storage unit of the storage device 56. Store as data. Thus, the statistical data for each molded product is sequentially stored in the storage unit of the storage device 56.

  The second statistical data output unit 415 of the HMI unit 41 reads the statistical data from the storage unit of the storage device 56 and outputs it to the display unit 43 with a touch panel. Thus, on the display unit 43 with a touch panel, statistical data on the filling time, the metering time, the take-out time, the cycle time, the holding pressure, and the like, which are monitoring targets, is displayed as a trend L statistic with respect to the reference value. Is displayed in the form of a graph B indicating whether or not it is fluctuating. Note that the statistical data for 1000 shots is displayed on the display screen. In addition, the time is also displayed so that the statistical data can be seen at which time.

  When the display screen is switched to the L statistical result, as shown in FIG. 7, the latest shot data, maximum value, minimum value, average, filling time, weighing time, take-out time, cycle time, holding pressure, etc. Statistical data for each item such as fluctuation range, distribution rate, standard deviation, etc. is displayed as numerical data. And this statistical display process is complete | finished when shaping | molding of a molded article is performed for 3000 shots.

  Thus, since the result of statistical processing based on the measurement data of the molded product to be molded can be displayed as a graph or numerical data, the molded state of the molded product can be confirmed. Since the molding state of a large number of molded products corresponding to 3000 shots can be confirmed, the number of molded products to be statistics is large, which is suitable for molding quality control during mass production. In this case, quality control at the time of molding of the molded product can be sufficiently enhanced. Here, the number of sample shots is set to 3000. However, in this statistical process, the number of sample shots can be set large. For example, the number of sample shots can be set up to 99999.

  Further, the storage unit of the storage device 56 is configured to be able to store measurement data for the past 1000 shots. For example, when you want to see statistics for the past 500 shots of a molded product that is currently being molded, touch panel The touch panel of the additional display unit 43 is operated to cause the display unit to perform statistical display as shown in FIG. Then, when a start “500” shot is input on the screen and an end “1000” shot is input and the enter key C is operated, the first instruction unit 313 of the main control unit 31 causes the HMI unit 41 to store the storage device. Of the 1000 shots stored in 56 storage units, an instruction to calculate and display statistical data using the latest 500 shots of measurement data is issued.

  As a result, the first statistical data output means 413 of the HMI unit 41 reads the latest 500 shots of measurement data from the storage unit of the storage device 56 to calculate desired statistical data, and the calculated statistical data is displayed on the touch panel. The data is output to the attached display unit 43. Thus, statistical data such as filling time, weighing time, take-out time, cycle time, holding pressure, etc., which are monitoring targets, are immediately displayed on the display unit with a touch panel 43 as shown in FIG. . That is, it is displayed on the display unit with touch panel 43 in the form of a graph D indicating how the trend S statistics are fluctuating with respect to the reference value, for example. Further, when the quality monitor item is selected on this screen, a part of the display screen is switched as shown in FIG. 9, and numerical data E indicating quality can be displayed together with the graph D.

As described above, when it is desired to immediately confirm the molding state of the molded product using the past measurement data, the past measurement data stored in the storage unit of the storage device 56 is used by designating the number of shots of 1000 shots or less. Statistical data can be displayed in a short time. Therefore, it is suitable when confirming statistical data of a certain section of a past molded product. In this case as well, quality control during molding of the molded product can be sufficiently enhanced by checking the statistical data.
In this embodiment, the display unit with a touch panel is provided separately from the HMI unit. However, the display unit with a touch panel may be integrated with the HMI unit.

The figure which shows the structure of the electric injection molding machine which concerns on one embodiment of this invention. The block diagram of the control apparatus of the injection molding machine main body which concerns on the same embodiment. The block diagram which shows the structure of the HMI part of FIG. The block diagram which shows the principal part function structure of the main-control part of FIG. The block diagram which shows the principal part function structure of the HMI part of FIG. The figure which shows the L statistics display screen in the display part with a touch panel of FIG. The figure which shows the display screen of the L statistics result in the display part with a touch panel of FIG. The figure which shows the S statistics display screen in the display part with a touch panel of FIG. The figure which shows the screen of S statistics display in the display part with a touch panel of FIG. 2, and a quality monitor display.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Injection molding machine main body, 18 ... Mold, 31 ... Main control part, 311 ... Measurement means, 312 ... Measurement data control means, 313 ... 1st instruction | indication means, 314 ... 2nd instruction | indication means, 315 ... Statistical data Control means, 41... HMI (human machine interface) unit, 413... First statistical data output means, 415... Second statistical data output means, 43.

Claims (1)

In an injection molding machine that heats and melts a synthetic resin material in a barrel, measures it, and injects it into a mold from an injection nozzle to form a molded product.
Each time a molded product is molded, the molten resin filling time in the mold, the molten resin metering time in the barrel, the removal time of the molded product in the mold, the cycle time required to mold one molded product, etc. A measuring means for measuring the monitoring object, a storage part, a measurement data control means for controlling the storage part to store measurement data for each monitoring object measured by the measuring means in a preset number of moldings, and a screen display A display unit for displaying, a first instruction unit for instructing display of statistical data by setting the number of statistical objects within the range of the number of moldings stored in the storage unit, and an instruction for displaying statistical data by the first instruction unit If there is, the measurement data for the number of statistical objects set from the storage unit is read, desired statistical data is calculated, and the calculated statistical data is output for display on the display unit According to the second instruction means for instructing the display of the statistical data using the measurement data of the molded product to be molded without using the measurement data of the storage unit, and the second instruction means When there is an instruction to display statistical data, statistical data control means for performing control for immediately calculating desired statistical data from the measurement data for each monitoring object measured by the measurement means and storing the data in the storage unit, and the storage unit Second statistical data output means for reading out the statistical data and outputting it for display on the display unit , wherein the first statistical data output means and the second statistical data output means provide statistical data in a desired shape. A control apparatus for an injection molding machine , wherein the display unit displays a trend form in a range of the number .

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