JP2008155515A - Injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To set the actually measured data graph image of an injection process in a case that a control technique wherein the position of a screw is not determined at the time of completion of plasticization is taken so as not to impart a feeling of uneasiness to an operator and to easily and certainly perform the mutual comparison of the actually measured data of a primary injection process by overlapped drawing. <P>SOLUTION: In a case that plasticization control becoming indefinite in the position of the screw at the time of completion of plasticization is performed and injection control becoming definite in the advance stroke of the screw is performed, the start point of the line drawing graph of the actually measured data along the position axis of the primary injection process in the actually measured data graph image of an injection process is always set to the same position to display the line drawing graph of the actually measured data of the primary injection process. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to an inline screw type 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, etc. 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, there is an actual measurement data graph image of the injection process in which the actual measurement data of the injection process (primary injection process and subsequent holding pressure process) is graphically displayed by line drawing. In the actual measurement data graph image, a line graph of the actual measurement data of the primary injection process is displayed along the position axis, and a line graph of the actual measurement data of the pressure holding process is displayed along the time axis. The starting point of the line graph of the actual measurement data of the injection process was set as the advance start position (injection start position) of the screw. Then, by using the graph image of the actual measurement data of the injection process, the status of the speed feedback control of the primary injection process and the status of the pressure feedback control of the pressure holding process can be visually recognized at a glance. .

  By the way, for the control of the plasticizing process (metering process) in the injection molding machine, there are a technique for controlling the position of the screw at the time of completion of plasticization, and a technique for performing a control in which the position of the screw at the time of plasticization is not determined. There is. This latter plasticization control method is the same as that proposed by the applicant of the present application in Japanese Patent Application Laid-Open No. 11-129296. In the plasticizing process, the pressure control on the screw is continued until the plasticization is almost completed. The resin density of the melted resin weighed and stored in is made constant, and the injection amount is made constant by controlling the injection stroke at the time of injection, but pressure control is given priority in the plasticizing process. As a result, the screw position at the completion of plasticization varies.

  In the actual measurement data graph image of the injection process described above, the starting point of the line drawing graph of the actual measurement data of the primary injection process is the screw advance start position. In this case, the starting point of the line drawing graph of the actual measurement data of the primary injection process for each molding cycle is constant, but when a control method is used in which the screw position at the time of plasticization is not determined In each molding cycle, the starting point of the line drawing graph of the actual measurement data of the primary injection process varies. For this reason, when a control method is used in which the screw position at the end of plasticization is not determined, the machine is operating normally as intended with the intended control, and the actual measurement of the primary injection process is performed. The starting point of the data line graph varies, and as a result, the entire line graph of the actual measurement data of the primary injection process varies, indicating that the operator of the machine may feel uneasy about normal operation was there.

  FIG. 3 shows an example of a measured data graph image of a conventional injection process in a case where a control method is employed in which the screw position at the time of plasticization is not determined. In the graph of FIG. 3, the vertical axis represents speed and pressure, the right half of the horizontal axis represents position, and the left half of the horizontal axis represents time. On the horizontal axis, P1 is a pressure holding start position (that is, the speed at which the primary injection is completed → the pressure switching position), and T1 is pressure holding start timing (that is, the speed at which the primary injection is completed → the pressure switching timing). ).

  In FIG. 3, the actual measurement data of the injection process for two molding cycles (two shots) is drawn by overwriting, the solid line indicates the actual measurement data of the latest molding cycle, and the broken line is one before the latest molding cycle. The actual measurement data of the molding cycle is shown, 51 is the actual measurement speed of the latest molding cycle, 52 is the actual measurement pressure of the latest molding cycle, 53 is the actual measurement speed of the previous molding cycle, and 54 is the actual measurement of the previous molding cycle. It is a pressure, 55 is a set speed, 56 is a set pressure. As shown in FIG. 3, although the machine is operating normally, the starting point of the graph drawing is different between the actual measurement speed 51 and the actual measurement speed 53 in the primary injection process, and the actual measurement in the primary injection process is different. The entire line graph is shifted between the speed 51 and the actually measured speed 53. Similarly, the entire line graph is shifted between the actually measured pressure 52 and the actually measured pressure 54 in the primary injection process. For this reason, as described above, it gives the operator anxiety that the machine is not operating normally, and makes it difficult to compare measured data between molding cycles in the primary injection process. It was.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an operator with an actual measurement data graph image of an injection process when a control method is employed in which the screw position at the time of plasticization completion is not determined. In addition to providing no feeling, it is possible to easily and reliably compare measured data of primary injection processes in different molding cycles.

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
Along with the position axis of the primary injection process in the actual measurement data graph image of the injection process when performing plasticization control that makes the screw position indefinite at the end of plasticization and performing injection control that makes the forward stroke of the screw constant The line drawing graph of the actual measurement data of the primary injection process is displayed with the starting point of the line drawing graph of the actual measurement data always set at the same position.

  In the present invention, when performing plasticization control in which the position of the screw at the time of plasticization completion is indefinite and performing injection control in which the forward stroke of the screw is constant, the primary injection process in the actually measured data graph image of the injection process is performed. Since the line drawing graph of the measured data of the primary injection process is always displayed at the same position as the starting point of the line drawing graph of the measured data along the position axis, the starting point of the line drawing graph of the measured data of the primary injection process is each molding This is the same for each cycle (each shot), so that the operator does not feel uneasy about whether the machine is operating normally. Moreover, since the starting point of the line drawing graph of the measured data of the primary injection process is the same in each molding cycle, it is possible to easily and reliably compare the measured data of the primary injection process of different molding cycles depending on the overwriting. it can.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 relate to an in-line screw type injection molding machine according to an embodiment of the present invention (hereinafter referred to as this embodiment), and FIG. 1 is a simplified control system of the injection molding machine according to this embodiment. FIG.

  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. The display image data generation unit 18 is instructed by a general control unit (not shown) in the system controller 1 to “plasticize by continuing the pressure control on the screw until the plasticization is almost completed in the plasticizing step. A control mode in which the resin density of the molten resin measured and stored at is constant, and the injection amount is constant by controlling the injection stroke at the time of injection (hereinafter referred to as control mode MA). When it is notified that the starting point of the line drawing graph of the measured data along the position axis of the primary injection process in the measured data graph image of the injection process is always the same position, The graphic image data (line drawing graph image data of the actual measurement data) is moved relative to the graph graduation grid image data at a predetermined magnification, starting from a certain position. It combines the grid image data and graphic image data. 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 an actual measurement of an injection process displayed when an operator touches an “injection graph” button 20 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 example of a data graph image is shown. The actual measurement data graph image of the injection process in FIG. 2 is an example when the machine is in the control mode MA described above. In the graph of FIG. 2, the vertical axis represents speed and pressure, the right half of the horizontal axis represents position, and the left half of the horizontal axis represents time. On the horizontal axis, P1 is a pressure holding start position (that is, the speed at which the primary injection is completed → the pressure switching position), and T1 is pressure holding start timing (that is, the speed at which the primary injection is completed → the pressure switching timing). ).

  In FIG. 2, the actual measurement data of the injection process for two molding cycles (two shots) is drawn by overwriting, the solid line indicates the actual measurement data of the latest molding cycle, and the broken line is one before the latest molding cycle. The actual measurement data of the molding cycle is shown. 21 is the actual measurement speed of the latest molding cycle, 22 is the actual measurement pressure of the latest molding cycle, 23 is the actual measurement speed of the previous molding cycle, and 24 is the actual measurement of the previous molding cycle. It is a pressure, 25 is a set speed, and 26 is a set pressure. In the example shown in FIG. 2, a line graph of actually measured data when the machine is operating normally is shown.

  When the machine is in the control mode MA, as shown in FIG. 2, the starting point of the line drawing graph of the actual measurement data in the primary injection process is the same in each molding cycle (each shot). Therefore, the starting points of the line graphs of the measured speeds 21 and 23 of the two molding cycles in the primary injection process are the same, and the measured speeds 21 and 23 are substantially overlapped. Similarly, the starting points of the line graphs of the measured pressures 22 and 24 of the two molding cycles in the primary injection process are the same, and the measured pressures 22 and 24 are substantially overlapped. Therefore, even when the machine is in the control mode MA described above, it does not give the operator anxiety that the machine is not operating normally. Moreover, since the starting point of the line drawing graph of the actual measurement data of the primary injection process is the same in each molding cycle, it is possible to easily and reliably compare the actual measurement data of the different primary injection processes depending on the overwriting.

It is the block diagram which simplified the control system in the in-line screw type injection molding machine which concerns on one Embodiment of this invention. In an in-line screw type injection molding machine according to an embodiment of the present invention, when plasticization control is performed so that the position of the screw at the time of plasticization is indefinite, and injection control is performed so that the forward stroke of the screw is constant It is explanatory drawing which shows the example of the measurement data graph image of the injection process displayed on a display apparatus. In a conventional inline screw type injection molding machine, when the plasticization control is performed so that the position of the screw becomes indefinite when plasticization is completed, and the injection control is performed so that the forward stroke of the screw is constant, it is displayed on the display device. It is explanatory drawing which shows the example of the actual measurement data graph image of the injection process.

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 (1)

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.
Along with the position axis of the primary injection process in the actual measurement data graph image of the injection process when performing plasticization control that makes the screw position indefinite at the end of plasticization and performing injection control that makes the forward stroke of the screw constant An injection molding machine characterized in that the line drawing graph of the actual measurement data of the primary injection process is displayed with the starting point of the line drawing graph of the actual measurement data always set at the same position.

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