JP4921146B2 - Injection molding machine - Google Patents

Description

  The present invention relates to an injection molding machine including a display device capable of displaying images in various display modes under the control of a controller that controls the entire machine (injection molding machine).

  Recent injection molding machines are equipped with a display device such as a color liquid crystal display. With this display device, various operation condition setting mode images for setting or confirming the operation conditions for automatic operation, during automatic operation Various measurement data display mode images for displaying the actual measurement data of a large number of measurement items, periodic inspection mode images for automatically displaying the inspection items at the periodic inspection timing and encouraging periodic inspections, this indication when an abnormality occurs An alarm mode image for recognition is displayed.

  Among the above-described actual measurement data display mode images, the monitor item display mode image (hereinafter, this display mode) displays the actual measurement data of a plurality of monitor items (monitoring items) for each molding cycle in numerical order in the molding cycle. The monitor item numerical list image is referred to as a monitor item numerical list image), and by using this monitor item numerical list image, the transition of the measured data of the important monitor items for each cycle can be confirmed in time series.

  There are a number of monitor items that can be displayed in the monitor item numerical list image described above. The monitor items that have already been set at the time of shipment of the machine or the operator of the machine can select from a number of monitor items. The monitor item with the desired item selected and set allows the change status of the item that needs to be monitored during continuous operation to be easily confirmed by numerical data arranged in time series, and operation in a continuous molding cycle. It is significant for grasping the situation.

  By the way, an inline screw type injection molding machine generally adopts an open nozzle method (a method having a nozzle that does not have a valve for opening and closing the nozzle opening), and starts injection after plasticization (measuring) is completed. In the open nozzle type, the drooling that causes resin to leak from the nozzle becomes a problem. Therefore, in the open nozzle type injection molding machine, after the plasticization is completed, the screw is forcibly moved back slightly. I am doing so. However, in order to optimally adjust the amount of screw retraction in this suckback process, a wealth of experience and knowledge is required.If the amount of retraction of the screwback is insufficient, drooling occurs and the amount of retraction of the screwback is large. If it is too high, the resin pressure that has been plasticized and stored on the tip side of the screw becomes negative, and air may be sucked in from the nozzle tip side, which may adversely affect the molded product.

  However, in the past, detection of drooling has been left to visual confirmation after the machine has been stopped, and whether drooling has occurred without stopping the machine during continuous molding operation. At present, there is no method for confirming with monitor item numerical list images. Therefore, instead of a visual check after the machine is stopped, whether or not drooling has occurred during continuous molding operation, or a transition to a situation where drooling may occur during continuous molding operation It has been demanded to be able to quantitatively grasp the fact by displaying the numerical data of the monitor item numerical list image.

  The present invention has been made in view of the above points. The object of the present invention is whether drooling occurs during the continuous molding operation or there is a risk of drooling occurring during the continuous molding operation. The transition to the situation is to be able to grasp quantitatively at a glance by displaying the numerical data of the monitor item numerical list image.

In order to achieve the above-described object, the present invention includes a controller that drives and controls each part of the machine based on each set operating condition value and measurement information from each sensor, and the controller includes a predetermined molding operation. A series of molding operation steps are executed according to a program, and measured data of each operating condition during operation is captured and stored, and the controller displays images in various display modes on a display device based on an operator's instruction. in the injection molding machine is, the images of a plurality of monitor items measured monitor item display mode data lists numerically to forming shape cycle order for each molding cycle, the period from after the end of the suck-back process to the start of the injection process the measured pressure data of the molten resin Luz crus front side put in a predetermined timing and a numerical value can be displayed in, and said predetermined Thailand In the numerical display of the measured pressure data of the molten resin on the screw front end side in the screw, the screw front end side at the sampling timing immediately before the mold opening process is started among the sampling timings of pressure detection performed at minute time intervals. The measured pressure data of the molten resin and the measured pressure data of the molten resin on the screw front end side at the sampling timing immediately before the injection process is started are described.
The measured pressure data of the molten resin on the screw front end side at the sampling timing immediately before the injection process is started is the measured pressure data of the molten resin on the screw front end side from the end of the suck back process to the start of the injection process. It is the maximum value of pressure data.

When suck back is performed after plasticization (measurement) is completed, the measured pressure of the molten resin on the screw front end side will temporarily drop, but the resin (molten resin) on the rear side of the check valve attached to the neck of the screw will Even after the rotation is stopped, the forward inertia remains (the forward inertia after the screw rotation is stopped by the molten resin to which the forward transfer force is applied by the screw feeding action accompanying the screw rotation). The measured pressure of the molten resin on the screw front end side once lowered causes a phenomenon of gradually increasing. In the present invention, paying attention to this boosting phenomenon, in the monitor item numerical list image, for example, among the sampling timings of pressure detection at minute time intervals, the screw front end side at the sampling timing immediately before the mold opening process is started. The measured pressure data of the molten resin and the measured pressure data of the molten resin at the screw front end at the sampling timing immediately before the injection process is started can be displayed numerically. It is possible to grasp at a glance quantitatively by displaying the numerical data whether drooling is occurring or whether it is shifting to a situation where drooling may occur during continuous molding operation. Thus, measures can be taken at an early stage. In addition, since the measured pressure data at two points in one molding cycle are displayed together, it is very useful for analyzing the cause of drooling.
Alternatively, in the monitor item numerical list image, the maximum value of the actually measured pressure data of the molten resin on the screw front end side from the end of the suck back process to the start of the injection process can be displayed numerically, similar to the above In addition, whether or not drooling has occurred during continuous molding operation, or whether or not there is a risk of drooling during continuous molding operation, can be quantitatively measured at a glance by displaying numerical data. This makes it possible to quickly grasp measures.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 relate to an open nozzle inline screw type injection molding machine according to an embodiment of the present invention (hereinafter referred to as this embodiment), and FIG. 1 illustrates the control of the injection molding machine according to this embodiment. It is the block diagram which simplified the system | strain.

  In FIG. 1, reference numeral 1 denotes a system controller that controls operation control and display control of the entire machine (injection molding machine). This system controller 1 includes hardware resources such as arithmetic functional elements and memories, and various types of resources that are held in advance. In cooperation with software resources such as application software, various processing such as various arithmetic processing, data writing / calling processing, display control processing, and command output processing are executed. The functions of the function blocks shown in the system controller 1 will be described later. Each function block is realized by the hardware resource and the software resource. Further, 2 is a sensor group composed of a large number of sensors provided in each part of the machine, and 3 is composed of a large number of driver circuits for driving and controlling a large number of drive sources arranged in each part of the machine. A driver group 4 is a key input device disposed on the front portion of the machine, and 5 is a display device (color liquid crystal display device with a touch panel) with a touch panel input portion 5a disposed on the front portion of the machine. The key input device 4 and the touch panel input unit 5a constitute a user input interface.

  The system controller 1 includes a plasticizing operation, a suck back operation, a mold opening / closing operation (a mold opening operation and a mold closing operation (a mold closing / clamping operation)), an ejecting operation (an eject ejecting operation and an eject returning operation), an injection operation (1 Control of the entire molding process such as the next injection operation and pressure holding operation), calculation / storage processing of measured data, calculation / determination processing such as non-defective / defective product determination processing, abnormality determination processing, or output of the display device 5 Various processes such as an image display control process are executed. In the system controller 1, 11 is a molding condition setting storage unit, 12 is a molding process control unit, 13 is an actual measurement value storage unit, and 14 is a display processing unit. Further, in the display processing unit 14, 15 is a data conversion processing unit, 16 is a graph scale generation unit, 17 is a fixed data storage unit for display, and 18 is a display image data generation unit.

  In the molding condition setting storage unit 11, various operating condition values input by the touch panel input unit 5 a or the key input device 4 or transferred from various storage media and input are stored in a rewritable form. Yes. The operating condition value includes, for example, the electric power value, the relationship between the screw position and screw rotation speed during the plasticizing process, the screw retraction speed, and the back pressure, the suck back control condition, and the holding pressure switching from the injection start point (position). Injection speed condition to point (position) and injection pressure condition, secondary injection pressure (holding pressure) condition from holding pressure switching time to holding pressure end time, mold closing (clamping) stroke and speed / pressure control conditions, Examples include mold clamping force, mold opening stroke and speed / pressure control conditions, eject control conditions, temperature control conditions for each part, control conditions for an automatic product take-out machine, and the like.

  The molding process control unit 12 is based on a previously created molding process control program and set condition values stored in the molding condition setting storage unit 11, and includes sensor groups 2 (position sensors, pressure sensors) disposed in each part of the machine. The corresponding drive source is driven via the driver group 3 (motor driver, heater driver, etc.) while referring to the measurement information from the sensor, rotation speed sensor, temperature sensor, etc.) and the timekeeping information from the built-in clock. Control and execute a series of molding steps.

  In the actual measurement value storage unit 13, all the actual measurement data of the monitor items set in advance during the continuous automatic operation are captured over a predetermined number of consecutive shots. Examples of monitor items to be captured include time monitoring items, position monitoring items, rotational speed monitoring items, speed monitoring items, pressure monitoring items, temperature monitoring items, power monitoring items, and the like.

  The display processing unit 14 displays a display image in a designated display mode based on a display image creation / control program created in advance in response to an instruction for calling a display image in a mode desired by the operator using the touch panel input unit 5a or the key input device 4. Create data.

  That is, when a call instruction for a predetermined display image by the operator arrives, the data conversion processing unit 15 of the display processing unit 14 displays the display from the information stored in the molding condition setting storage unit 11 or the actual measurement value storage unit 13 as necessary. Data for use in displaying the mode image is extracted and converted into a form corresponding to the display form of the designated display mode image. For example, if the specified display mode is a graphic image of a certain process or cycle, the extracted data is converted into image data that has been drawn, or the specified display mode is the operating state of a certain process. If it is a setting image, the extracted data is converted into numerical image data. When the designated display mode is a graphic image, the graph scale generation unit 16 generates a graph scale (graph scale) created in advance based on the contents of the data conversion processing unit 15 or the operator's scale instruction. Graph scale grid image data and scale numerical image data with a predetermined magnification are generated by the program.

  The generation processing data of the data conversion processing unit 15 and the graph scale generation unit 16 is taken into the display image data generation unit 18 and is enlarged / reduced according to the graph scale at a predetermined position on the graph scale grid image data at a predetermined magnification. The graphic image data captured by the conversion processing into the rate is overwritten and combined. Further, data to be used for displaying the display mode image from a large number of characters, symbols, graphic figures, ruled line data, and the like, which are fixed data for the mode image created and stored in advance in the display fixed data storage unit 17. Is extracted and taken into the display image data generation unit 18 and is also synthesized as image data for display.

  As a result, the display image data generation unit 18 arranges and synthesizes the specified graphic scale for the graphic display image, scale numbers, line drawing graph, mode display characters, unit symbols, item display characters, etc. Image data to which information or the like is added is created, and is held so as to be rewritable.

  When the designated display mode is not a graphic image, the image data for the designated display image is similarly displayed according to the contents of the data conversion processing unit 15 and the fixed display data storage unit 17. 18 is generated and held.

  The image data of the display image data generation unit 18 is transferred to a frame buffer (not shown) and temporarily stored, and the output of the frame buffer is sent to the display device 5 in response to a command from the display processing unit 14. Image data in a predetermined mode is displayed on the screen.

  FIG. 2 shows a monitor item selection mode displayed when an operator touches a “monitor item” button 21 in the display image in a state where image data of a predetermined mode is displayed on the display screen of the display device 5. The display image is shown. By using the display image of the monitor item selection mode, the operator can select or change the monitor item (monitor item) for displaying the measured data numerically in the monitor item numerical list image described later. By inputting a numerical value of the ID of a desired item among the items displayed in the monitor item candidate list display field 23 into the monitor item setting field 24, a monitor item to be displayed in the monitor item numerical value list image can be set. It has become. In the monitor item setting field 24 in the display image of the monitor item selection mode in FIG. 2, monitor items already set at the shipment stage of the machine are displayed at the initial stage. The monitor items already set at the stage include “97 injection residual pressure (die opening ST)” that is measured pressure data of the molten resin on the screw front end side at the sampling timing immediately before the mold opening process is started, and the injection process. "98 injection residual pressure (injection ST)", which is actually measured pressure data of the molten resin on the screw front end side at the sampling timing immediately before the start of the operation, is included.

  FIG. 3 shows a list of monitor item values displayed when the operator touches the “monitor display” button 22 in the display image in a state where image data of a predetermined mode is displayed on the display screen of the display device 5. An image is shown. In this monitor item numerical list image, actual measurement data of a plurality of monitor items for each molding cycle is displayed as a list in numerical order in the molding cycle. In the example shown in FIG. The “VP switching position” which is the screw position at the speed-pressure switching position during the process (the switching position from the primary injection process to the pressure holding process) and the “cushion position which is the screw position corresponding to the cushion amount” And the actual measurement data value 26 of “97 injection residual pressure (die opening ST)” and the actual measurement data value 27 of “98 injection residual pressure (injection ST)” are written together. Is displayed. The actual measurement data of “97 injection residual pressure (die opening ST)” includes sampling timing (pressure detection sampling cycle (pressure detection pressure) immediately before the mold opening process among the sampling timings of pressure detection at a minute time interval. The sampling timing interval of detection (here, 0.5 msec) is actually measured pressure data of the molten resin on the screw front end side, and the actually measured data of “98 injection residual pressure (injection ST)” is a minute time interval. This is measured pressure data of the molten resin on the screw front end side at the sampling timing immediately before the injection process is started among the sampling timings of pressure detection. Therefore, the measured data of “97 injection residual pressure (die opening ST)” is actually measured data within 0.5 msec from the start timing of the mold opening process, and is actually measured data of the start timing of the mold opening process. The actual measurement data of “98 injection residual pressure (injection ST)” is actual measurement data within 0.5 msec before the injection process is viewed from the start timing, and is substantially actual measurement data of the start timing of the injection process.

  In the monitor item numerical value list image shown in FIG. 3, the operator sets the numerical value 26 of the actual measurement data of “97 injection residual pressure (mold opening ST)” and the numerical value 27 of the actual measurement data of “98 injection residual pressure (injection ST)”. As described above, the measured pressure of the molten resin on the screw front end side that rises after being lowered by the suck back as described above is calculated at the timing at which the approximate mold opening process is started and the approximate injection process is started. This allows you to check whether drooling has occurred during continuous molding operation, or whether it is shifting to a situation where drooling may occur during continuous molding operation. It becomes possible to grasp quantitatively at a glance by displaying. In addition, since the measured pressure data at two points in one molding cycle are displayed together, it is very useful for analyzing the cause of drooling.

  FIG. 4 shows one-cycle actual measurement displayed when the operator touches the “one-cycle graph” button 30 in the display image in a state where image data of a predetermined mode is displayed on the display screen of the display device 5. A graph image is shown. In the one-cycle actual measurement graph image shown in FIG. 4, the actual measurement data is drawn with the start of the plasticizing process as the starting point and the end of the injection process (primary injection process and pressure holding process) as the end point. In FIG. 4, 31 is a plasticizing screw rotation speed, 32 is a plasticizing back pressure, 33 is a plasticizing screw retracting speed, 34 is a suckback speed (suckback screw retracting speed), and 35 is associated with sucking back. Negative pressure of resin, 36 is resin residual pressure after suck back, 37 is mold opening speed, 38 is eject ejecting speed, 39 is eject return speed, 40 is mold closing / clamping speed, 41 is injection speed (screw of injection) (Speed), 42 is an injection pressure (injection resin pressure). In the one-cycle actual measurement graph image of FIG. 4, the actual measurement pressure data at the timing T1 in the figure corresponds to the actual measurement data of “97 injection residual pressure (die opening ST)”, and the actual measurement pressure data at the timing T2 is This corresponds to actual measurement data of “98 injection residual pressure (injection ST)”. It is possible to confirm whether drooling has occurred or whether drooling is likely to occur based on actual measurement data of “97 injection residual pressure (mold opening ST)” and “98 injection residual pressure (injection ST)”. it can.

  In the above-described embodiment, the measured pressure data of the molten resin on the front end side of the screw is numerically displayed at the start timing of the approximate mold opening process and the approximate start timing of the injection process. In FIG. 4, the highest measured pressure data (measured pressure at T3 in FIG. 4) among the measured pressure data of the molten resin on the screw front end side measured from the end of the suck back process to the start of the injection process. (Data) may be displayed numerically. Even in this case, it is possible to confirm whether drooling has occurred or whether drooling is likely to occur.

It is the block diagram which simplified the control system in the in-line screw type injection molding machine of the open nozzle which concerns on one Embodiment of this invention. It is explanatory drawing which shows the example of the display image of the monitor item selection mode displayed on a display apparatus in the injection molding machine which concerns on one Embodiment of this invention. It is explanatory drawing which shows the example of the monitor item numerical value list image displayed on a display apparatus in the injection molding machine which concerns on one Embodiment of this invention. In the injection molding machine which concerns on one Embodiment of this invention, it is explanatory drawing which shows the example of the 1 cycle measurement graph image displayed on a display apparatus.

Explanation of symbols

1 system controller 2 sensor group 3 driver group 4 key input device 5 display device (color liquid crystal display device with touch panel)
5a Touch panel input unit 11 Molding condition setting storage unit 12 Molding process control unit 13 Actual measurement value storage unit 14 Display processing unit 15 Data conversion processing unit 16 Graph scale generation unit 17 Fixed data storage unit for display 18 Display image data generation unit

Claims (2)

A controller for driving and controlling each part of the machine based on each set operating condition value and measurement information from each sensor, and the controller executes a series of molding operation steps in accordance with a predetermined molding operation program. The actual measurement data of each operating condition during operation is captured and stored, and the controller is an injection molding machine that displays images of various display modes on the display device based on instructions from the operator.
The images of the plurality of monitor items measured monitor item display mode data lists numerically to forming shape cycle order for each molding cycle, that put a predetermined timing during a period of time after the end of the suck-back process to the start of the injection process the measured pressure data of the molten resin of the scan crus front side numerical displayable,
In addition, the numerical display of the actually measured pressure data of the molten resin on the front end side of the screw at the predetermined timing includes screw sampling at the sampling timing immediately before the mold opening process is started, among the sampling timings of pressure detection performed at minute time intervals. An injection molding machine characterized in that the measured pressure data of the molten resin on the front end side and the measured pressure data of the molten resin on the screw front end side at the sampling timing immediately before the start of the injection process are written together . The injection molding machine according to claim 1,
The measured pressure data of the molten resin on the screw front end side at the sampling timing immediately before the injection process is started is the measured pressure data of the molten resin on the screw front end side after the suck back process is completed until the start of the injection process. An injection molding machine characterized by having a maximum value of .

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