JP5191871B2 - Injection molding measured value data recording method and injection molding machine - Google Patents

Description

  The present invention relates to a measurement value data recording method for collecting and recording measured value data such as temperature and pressure measured by measuring means provided in an injection molding machine at a predetermined timing for a predetermined period, and so on. The present invention relates to an injection molding machine equipped with a simple recording method.

  As is well known in the art, an injection molding machine includes an injection device that includes a heating cylinder and a screw that can be driven in the rotation direction and the axial direction within the heating cylinder, and molten resin is injected from the injection device. It consists of molds and so on. In each device of such an injection molding machine, a temperature sensor that measures the temperature of the molten resin and the temperature of the heating cylinder, a pressure sensor that measures the pressure of the molten resin at the time of injection and holding, and a screw position are measured. Various sensors such as a position sensor are provided, and measured value data such as temperature, pressure, and position are measured at a predetermined timing and sequentially displayed on a screen provided in the injection molding machine. Therefore, it is possible to monitor such measured value data to check whether a molding cycle including a mold clamping process, an injection process, a pressure holding process, a mold opening process, a protruding process, and the like is normally performed. The measured value data can also be saved in time series in the internal memory of the controller if a predetermined operation is performed on the controller provided in the injection molding machine. It is also possible to display and evaluate each step of the molding cycle. However, since the analysis tool such as general-purpose software is not installed in the controller, the measured value data cannot be analyzed sufficiently. Therefore, in order to analyze the measured value data using a general-purpose computer with analysis software installed, it is necessary to copy the time-series measured value data to an external storage medium such as a USB flash memory or magneto-optical disk. There is. However, conventionally, copying measured value data from the internal memory to the external storage medium requires a complicated operation and is not convenient.

Japanese Patent No. 4022156

  In Patent Document 1, when a predetermined recording start condition and a recording end condition are set, when various measurement value data are collected at a predetermined sampling period from the recording start timing to the recording end timing, And a method for recording measured value data that is simultaneously written to an external storage medium. According to the invention described in Patent Document 1, first, an external storage medium such as a USB flash memory is inserted into the storage device drive. Then, the controller is operated to instruct recording start and recording end. Then, whenever time-series measurement value data is sampled, it is stored in the internal memory and simultaneously written in the external storage medium. Therefore, the measurement value data can be copied to the external storage medium relatively easily without requiring a complicated operation in the controller, and the copied measurement value data can be taken out to the outside.

  Since the measurement value data recording method described in Patent Document 1 can be easily copied to an external recording medium, the measurement value data can be copied to an external general-purpose computer or the like. Measurement data can be easily analyzed. However, there are some problems. For example, according to the method described in Patent Document 1, it is necessary to insert an external storage medium such as a USB flash memory into the storage device drive in advance in order to copy measurement value data. It is not always carried. When the external storage medium is not carried, measurement value data cannot be copied. Further, according to the method described in Patent Document 1, the external storage medium is maintained in the inserted state from the start of recording to the end of recording, and the measurement value data is repeatedly stored from the start of recording to the end of recording. Is written on. Although not described in detail in Patent Document 1, in general, when such a recording method is performed, the external storage medium is set in a state in which measurement value data can be recorded before the recording is started. That is, the external storage medium is mounted on a file system of an operating system that operates on the controller. Next, a predetermined file is created in a predetermined directory, and the file is opened in the write mode. Since measurement value data is written sequentially from the start of recording to the end of recording, the data file is maintained in an open state. Then, after the end of recording, the file is closed and the external storage medium is unmounted from the file system of the operating system. That is, when the recording method described in Patent Document 1 is implemented, the time for mounting the external storage medium and the time for opening the file are long. If an error occurs while the file is open, the file will be destroyed. If an error occurs while the external storage medium is mounted, the file system in the external storage medium will be destroyed. Measurement data is lost, but since the time that the external storage medium is mounted and the time that the file is opened are long, the probability that such an accident will occur is high. As an example of such an abnormality, there is an accident that is relatively rare such as an instantaneous power failure such as a power failure or an operating system abnormality, but the operator accidentally pulls out the external storage medium from the external storage drive. The risk is not small because it includes operations that are relatively easy to occur.

  An object of the present invention is to provide a method for recording measurement value data of an injection molding machine, which solves the conventional problems or problems as described above, and an injection molding machine that implements such a recording method. Specifically, while being easy to operate, measurement value data for a predetermined period can be recorded in the internal memory and the external storage medium, and necessary measurement value data can be recorded even if the external storage medium is not carried. Injection molding that can easily copy measured value data to an external storage medium later, with virtually no possibility of losing the measured value data due to the occurrence of an abnormality or destroying the file system in the external storage medium It is an object of the present invention to provide a method for recording measured value data of a machine and an injection molding machine equipped with such a recording method.

  In order to achieve the above object, the present invention collects and records measured data such as temperature and pressure measured by a measuring means provided in an injection molding machine at a predetermined timing for a predetermined period. The measured value data is stored in the internal memory of the controller that controls the injection molding machine, and a file is created on the virtual disk in the internal memory to write the measured value data. Then, when writing of all measured value data to the file is completed, the file is copied to an external storage medium. In addition, when an external storage medium is not set in the controller, a warning message is output on the controller screen, and then the file is copied to the external storage medium when the external storage medium is set. The

That is, in order to achieve the above-mentioned object, the invention according to claim 1 is configured to obtain measured data such as temperature and pressure measured by a measuring unit provided in an injection molding machine at a predetermined sampling cycle. When collecting and recording a period, the measurement value data is stored in an internal memory of a controller that controls the injection molding machine, and a file is created on a virtual disk configured in the internal memory to store the measurement value data. After writing and writing the measured value data for the predetermined period to the file, it is determined whether or not an external storage medium is set in the controller, and when the external storage medium is set, the file Is copied to the external storage medium, the file is erased from the virtual disk, and the external storage medium is not set. Time, is configured to output a predetermined warning message on the display means provided in the controller, the invention according to claim 2, in the recording method of the measurement data according to claim 1, wherein the memory When it is detected that a medium is set in the controller, it is determined whether or not the file exists in the virtual disk, and if the file exists, the file is copied to the external storage medium, and the file Is erased from the virtual disk. According to a third aspect of the present invention, there is provided an injection molding machine provided with the measurement value data recording method according to the first or second aspect .

As described above, according to the present invention, when measured value data such as temperature and pressure measured by a measuring means provided in an injection molding machine is collected and recorded for a predetermined period at a predetermined sampling period, injection is performed. Create a file on the virtual disk configured in the internal memory of the controller that controls the molding machine, write the measured value data, write the measured value data for a specified period to the file, and then set the external storage medium in the controller Determine whether or not. And when set, the file is copied to the external storage medium, that is, after all the measured value data is written to the file in the virtual disk, the file is copied to the external storage medium. The time for mounting and the time for opening the file in the external storage medium can be extremely short. Therefore, even if the external storage medium is removed from the controller due to an erroneous operation by the operator, there is virtually no possibility that the file system of the external storage medium or the file will be damaged. Therefore, important measurement value data is not lost, and measurement value data can be easily copied to an external storage medium and taken out. Further, when determining whether or not an external storage medium is set in the controller, when the external storage medium is not set, a predetermined warning message is output to the display means provided in the controller. Even if you don't carry an external storage medium, you can write the measured value data to a file in the virtual disk and save it, and a warning message will be output. Can be prompted to set. Files stored in such a virtual disk can be easily copied to an external storage medium and taken out if the operator later sets the external storage medium in the controller according to another invention. That is, according to another invention, when it is detected that the storage medium is set in the controller, it is determined whether the file exists on the virtual disk, and if the file exists, the file is copied to the external storage medium. Since the file is erased from the virtual disk, the file created on the virtual disk can be easily copied to an external storage medium.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The injection molding machine 1 according to the present embodiment is provided with a controller 2 that controls the injection molding machine 1 in the same manner as a conventionally known injection molding machine. As schematically shown in FIG. 1, the controller 2 is composed of a CPU 3, each device connected to the CPU 3 by a bus 4, that is, an internal memory 5 as a primary storage device, for example, a ROM, and an operating system and programs are Secondary storage device 6 stored therein, display device 7 including a touch panel display capable of input operation, external storage device 8 on which an external storage medium 8 such as a USB flash memory, a magneto-optical disk, or a memory card can be set It comprises an input / output interface 10 for inputting / outputting data between the drive 9 and the injection molding machine 1.

  A virtual disk 12 having a predetermined capacity is constructed in the internal memory 5 of the controller 2 according to the present embodiment. Since the virtual disk 12 can be used as a file system, a file can be created on the virtual disk 12 in the same manner as creating a file on the hard disk.

  An injection molding machine 1 is shown in a simplified manner in FIG. 1, but includes a pair of molds, a mold clamping device that opens and closes these molds, a heating cylinder, and a rotational direction and an axial direction in the heating cylinder. It is comprised from the injection apparatus etc. which consist of the screw provided so that drive is possible. Therefore, a plasticizing process for rotating the screw to melt the resin material, a mold clamping process for clamping the mold, an injection process for driving the screw in the axial direction and injecting the molten resin into the mold clamped, A molded product having a predetermined shape can be obtained through a pressure holding process for keeping the mold in a clamped state for a certain time, a mold opening process for taking out the molded product after the pressure holding process, and the like. Such an apparatus is provided with various sensors. For example, the mold clamping device has a strain sensor that measures the clamping force, and the injection device has a temperature sensor that measures the temperature of the molten resin, a pressure sensor that measures the injection pressure, a position sensor that detects the position of the screw, and the like. Is provided. Measured value data such as temperature, pressure, and position can be measured by such various sensors, and the measured value data is input to the controller 2 via the input / output interface 10. Accordingly, the various measured value data that are input are sequentially displayed on the display device 7 to monitor whether or not the molding cycle including the mold clamping process, the injection process, the pressure holding process, the mold opening process, and the like is normally performed. be able to. Each device constituting the injection molding machine 1 is provided with predetermined actuators such as a servo motor and a piston cylinder unit for driving these devices. Since such an actuator is connected to the controller 2 via the input / output interface 10, the actuator is driven by a command from the controller 2. That is, each device of the injection molding machine 1 can be driven by a command from the controller 2. Therefore, the controller 2 can manage the measurement value data in association with each process constituting the molding cycle and display it on the display device 7.

  Next, a recording method for recording measurement value data in the injection molding machine 1 according to the present embodiment will be described. In the injection molding machine 1 according to the present embodiment, it is possible to record time-series measurement value data sampled at a predetermined timing over an arbitrary period. Such an arbitrary period may be, for example, a period determined by a recording start time and a recording end time specified in advance, or from a predetermined process constituting another molding cycle to another process. It may be a period. Furthermore, it may be determined as a period of a molding cycle for a predetermined number of times. Hereinafter, an example in which the recording start time and the recording end time are designated will be described.

  The touch panel of the display device 7 is operated to input a recording start time and a recording end time. As shown in FIG. 2, the controller 2 determines whether or not a recording start condition is satisfied (step S1). If the current time does not reach the recording start time, the recording start condition is not satisfied. That is, the condition is not satisfied, and the process returns to step 1. When the current time reaches the recording start time, the recording start condition is satisfied. Doing so will proceed to the next step. In step S2, data of measured values such as temperature, pressure, and position are sampled. Next, the sampled measurement value data is stored in a predetermined buffer of the internal memory together with a time stamp (step S3). The measured value data can be stored in an arbitrary data format that is easy to handle by the operating system operating on the controller 2, but is stored in the binary format in the controller 2 according to the present embodiment. A data file D is created on the virtual disk, and the data file D is opened in the write mode. The file name of the data file D can be given a unique name in the system including the file creation time, for example. The measured value data is written in the data file D together with the time stamp (step S4). Writing to the data file D is written with an ASCII character string, and each measured value data is separated by a comma. That is, writing is performed in CSV format.

  The controller 2 checks the recording end condition (step S5). If the current time has not reached the recording end time, the recording end condition is not satisfied, and the process returns to step 2. The measured value data is sampled (step S2), and the measured value data is stored together with a time stamp in a predetermined buffer of the internal memory (step S3). Then, the measured value data and the time stamp are added and written to the data file D that has already been opened in the writing mode (step S4). Steps S2 to S4 are repeated until the current time reaches the recording end time. When the current time reaches the recording end time, the recording end condition is satisfied (step S5). Then, the data file D is closed (step S6).

  The controller 2 checks whether or not an external storage medium such as a USB flash memory is set in the external storage device drive 9 (step S7). When the external storage medium is set, access to the external storage medium is started. That is, the mounting is performed, and the file system of the external storage medium is incorporated into the file system of the operating system operating on the controller 2 (step S8). Next, the data file D in the virtual disk is copied to the external storage medium (step S9). The data file D is erased from the virtual disk (step S10). Terminates access to the external storage medium. That is, unmounting is performed, and the file system of the external storage medium is separated from the file system of the operating system (step S11). Stop recording measured value data.

  If it is detected in step S7 that the external storage medium is not set, a warning message indicating that the external storage medium is not set properly is output to the display device 7 (step S12). Stop recording measured value data. After that, when the external storage medium is set in the external storage device drive 9, the controller 2 detects that the external storage medium is set, and automatically performs steps S8 to S11. That is, the external storage medium is mounted (step S8). The data file D is copied from the virtual disk to the external storage medium (step S9). Then, the data file D is erased from the virtual disk (step S10), and the external storage medium is unmounted (step S11).

  In the measurement value data recording method according to the present embodiment, the measurement value data is also stored in a predetermined buffer of the internal memory 5. That is, time-series measured value data sampled from the designated recording start time to the recording end time is stored in the internal memory 5. Therefore, the stored measurement value data can be displayed on the display device 7 as in the known injection molding machine.

  The measurement value data recording method according to the embodiment of the present invention is not limited to the above-described embodiment, and can be implemented in various forms. For example, the measured value data is described as measured values measured by various sensors provided in the injection molding machine 1, but the measured value data is data such as time measured by a timer in the controller. For example, time such as injection filling time and plasticizing time can also be recorded as measured value data. Furthermore, various injection molding conditions set in the controller may be recorded in the file copied to the external storage medium. In this way, the state of the molding cycle can be analyzed in more detail.

It is a block diagram which shows typically the controller of the injection molding machine which concerns on embodiment of this invention. It is a flowchart which shows the recording method of the measured value data in the injection molding machine which concerns on this Embodiment.

Explanation of symbols

1 Injection molding machine 2 Controller 3 CPU
5 Internal memory 6 Secondary storage device 7 Display device 8 External storage medium 9 External storage device drive 10 Input / output interface

Claims (3)

When measuring and recording measured value data such as temperature and pressure measured by a measuring means provided in the injection molding machine at a predetermined sampling period,
The measurement value data is stored in an internal memory of a controller that controls the injection molding machine, and a file is created on a virtual disk configured in the internal memory to write the measurement value data.
After writing the measurement value data of the predetermined period to the file, determine whether an external storage medium is set in the controller,
When the external storage medium is set, copy the file to the external storage medium, erase the file from the virtual disk,
When the external storage medium is not set, a predetermined warning message is output to a display means provided in the controller, and the measurement value data recording method of the injection molding machine is characterized in that: 2. The measurement value data recording method according to claim 1 , wherein when the storage medium is detected to be set in the controller, it is determined whether the file exists on the virtual disk, and the file exists. A method for recording measurement value data of an injection molding machine, wherein the file is copied to the external storage medium and the file is deleted from the virtual disk. Injection molding machine with a recording method of measurement data according to claim 1 or 2.

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