JP6532845B2 - Measuring device, measuring method, program - Google Patents

Description

  The present invention relates to, for example, a measuring apparatus, a measuring method, and a program for mass production monitoring of an injection molding apparatus and the like.

There is known a measurement system in which a measurement device measures a detection signal of a sensor installed in an injection molding apparatus. This measurement system is a behavior of molding material such as resin by a temperature sensor, pressure sensor, etc. arranged in the injection molding machine, in the mold, or in molding peripheral equipment (for example, temperature controller for cooling, vacuum drawing device etc.) Are detected, and real-time output is possible as a waveform to an information processing apparatus such as a personal computer.
Measurement data can be used for various applications such as setting of optimum molding conditions, automatic sorting of defective products, quality control, evaluation of molds, and the like.
In addition, in the measurement system, it is also possible to monitor the measurement value based on the detection signal of the sensor and to perform alarm output in response to the occurrence of an abnormality. This alarm output makes it possible to stop the injection molding apparatus and identify defective products.
For example, as a general method of mass production monitoring in injection molding, there is peak value management of a detection signal of a sensor being measured.
Patent Document 1 below discloses a technique in which a sensor provided in an injection molding apparatus detects the pressure of resin in a cavity, and the detection signal of the sensor is sampled by an amplifier device.

JP 2008-36975 A

Incidentally, monitoring of various detection signals and calculation of an evaluation value by calculation of an average value of the detection signals are usually performed in units of one molding cycle.
Here, one molding cycle in the injection molding apparatus has many processes such as mold clamping, resin material injection, holding pressure, measurement / cooling, mold opening, and taking out of a molded product. The various detection signals have different meanings in each process in the molding cycle. Then, depending on the type of sensor and the monitoring purpose, the detected value may not be meaningful for a certain period. For example, during a period in which the molded article is taken out after the mold is opened, the temperature detection value of the mold has no meaning in determining whether the molded article is good or bad.
When such things are considered, depending on the type of detection signal and the purpose of monitoring, it can be said that the evaluation value obtained from the detection value in one molding cycle unit may originally decrease as the accuracy for judgment of quality judgment etc. . In other words, if the detection value of only a specific period in one cycle is taken out, it is considered possible to make a highly accurate evaluation of the process of the period and the like.
Therefore, it is an object of the present invention to improve the evaluation accuracy of a detection signal and to appropriately execute the operation determination of a partial period such as a process unit.

The measuring apparatus according to the present invention includes an input unit capable of inputting a detection signal of a sensor disposed in an injection molding apparatus, and a mold clamping which is a part of a period of one molding cycle by the injection molding apparatus. An evaluation value calculation unit that calculates an evaluation value using a detected signal value input to the input unit in a designated period , which is a period or a speed control period, and injection molding using an evaluation value calculated by the evaluation value calculation unit A determination processing unit for determining a determination result of the situation , wherein the designated period ends based on a detection signal value or a change in the detection signal value .
The detection signals of the various sensors draw a profile which shows a characteristic variation within the period of one molding cycle by the injection molding apparatus. Note that one molding cycle is a period from when the mold clamping is started to start the injection of the resin to when the mold is removed and the molded product is taken out. Then, the evaluation value can be generated by calculating the detection signal value in the molding cycle. Here, the evaluation value is calculated using the detection signal value of the designated period and the determination using the evaluation value is performed not on the molding cycle but on a designated period of a part of the molding cycle.
In addition, some of the processes of the injection molding apparatus have a fixed time from the start to some extent. When targeting such a process, the designated period can be determined by the time count from the start of the molding cycle. In addition, there are some processes in which characteristics of the detection value of the sensor are generated depending on each process. When such a process is set as a designated period, the period is determined by the change of the detection signal.

The above-described measuring device includes a data log processing unit that performs processing of storing detection signal values at respective time points input to the input unit as log data during a period of one molding cycle by the injection molding device. It is conceivable that the data log processing unit performs processing of storing the evaluation value calculated by the evaluation value calculation unit as log data.
The detected signal values during the molding cycle are stored as log data. That is, the measuring device functions as a data logger of detection signal values such as various sensors provided in the injection molding device, such as a pressure sensor and a temperature sensor. Further, the evaluation value calculated using the detection signal value in the designated period is also stored as log data.

The above-described measuring device may determine the start timing or the end timing of the designated period in the period of one molding cycle based on a signal supplied from the outside.
For example, the designated period is grasped by the signal from the injection molding apparatus or the signal from the computer apparatus etc. which has started the corresponding software.

Measurement method according to the present invention includes an acquisition step of acquiring a detection signal of a sensor that is deployed in an injection molding apparatus, the part of the period within the period of one molding cycle by the injection molding device, the detection signal value or the An operation step of calculating an evaluation value using a detection signal value in a designated period which is a mold clamping period or a speed control period ending based on a change in detection signal value, and injection using the evaluation value calculated in the operation step Determining a determination result of the molding condition.
A program according to the present invention is a program that causes an arithmetic processing unit to execute the processing of each of the above steps.

  According to the present invention, the operation of the molding cycle of the injection molding apparatus and the quality judgment of the molded product can be more accurately performed. In particular, evaluation of a specified period can be appropriately performed, such as a process unit in one molding cycle.

It is a block diagram showing composition of an injection molding measurement system of an embodiment. It is explanatory drawing of the display screen by the management software of embodiment. It is a block diagram of a measuring device of an embodiment. It is explanatory drawing of the monitoring period of the detection signal of embodiment. It is a flowchart of the monitoring process of embodiment.

<Configuration of measurement system>
Hereinafter, embodiments according to the present invention will be described. First, an injection molding measurement system 100 (also simply referred to as “measurement system 100”) including the measurement device 1 and the injection molding device 2 according to the embodiment of the present invention will be described.
FIG. 1 is a view showing the outline of the configuration of a measurement system 100. As shown in FIG.
As illustrated, the measurement system 100 includes a measurement device 1, an injection molding device 2, a dedicated amplifier 3, and a personal computer 4.

  The injection molding apparatus 2 generally comprises a mold 10 disposed at a predetermined position, an injection unit 11 having a mechanism for injecting and filling a resin material to the mold 10, and an injection unit 11 as generally known. The molding control unit 12 is configured to perform and control a series of injection molding operations by controlling the injection operation of the above and the opening / closing operation of the mold 10 and the like.

For example, an upper mold and a lower mold are disposed in the mold 10, and the upper mold is opened and closed by a mechanism provided in the injection unit 11 with respect to a lower mold disposed in a molding stage, for example. In a state where the upper mold is closed to the lower mold, for example, the resin material is injected by the injection cylinder of the injection unit 11 to the gate provided in the upper mold, and the cavity in the mold 10 is filled with the resin material Ru. After filling, when the required time has elapsed, the upper mold is opened, and the resin molded product is taken out from the cavity.
An in-mold sensor 31 is disposed in the mold 10. For example, it is a temperature sensor which detects the temperature of the filled resin material, and a pressure sensor which detects the pressure of the resin material.
The structure and type of the mold 10 are not particularly limited, and various types are conceivable.

The injection unit 11 is provided with a mechanism necessary for injection molding, such as a resin material injection mechanism for the mold 10, a mold clamping mechanism, an injection cylinder mechanism, an injection motor, and the like.
Further, the injection unit 11 is provided with an in-injection unit sensor 32 and a sensor amplifier 33. As the in-ejection section sensor 32, there are a temperature sensor for detecting the temperature of the resin material in the injection process, a pressure sensor for detecting pressure, a position sensor for calculating the injection speed, and the like.
In the present embodiment, the mechanism and structure of the injection unit 11, such as a cylinder structure, a structure of a clamp mechanism, a runner structure, a nozzle structure, a heater arrangement, a motor arrangement, a material injection mechanism, etc. It may be of the type.

The forming control unit 12 includes, for example, a microcomputer having a read only memory (ROM), a random access memory (RAM), and a central processing unit (CPU).
The forming control unit 12 performs drive control of each unit by the injection unit 11. For example, injection motor control, mold stage operation control, operation control of the mold opening / closing mechanism, operation control of the nozzle opening / closing mechanism, heater control, material input operation control, etc. are performed. This causes a series of injection molding operations to be performed.

The detection signal S1 of the in-mold sensor 31 is converted into a voltage value by a dedicated amplifier 3 disposed separately from the injection molding apparatus 2, for example. Then, it is supplied to the measuring device 1 as the detection signal Vs1 converted to the voltage signal.
The detection signal S2 of the in-emission unit sensor 32 is converted into a voltage value by a sensor amplifier 33 provided in the emission unit 11, for example. And it is supplied to measuring device 1 as detection signal Vs2 converted into a voltage signal.

Here, although two detection signals are shown as the detection signals Vs1 and Vs2, the detection signal Vs1 is a generic name of the detection signal from the in-mold sensor 31, and the detection signal Vs2 is the detection signal from the in-ejection area sensor 32. It is a generic term. In the case where a plurality of sensors are disposed as the in-mold sensor 31 or in the case where a plurality of sensors are disposed as the in-mold sensor 32, it is naturally assumed.
Therefore, the detection signals Vs1 and Vs2 do not indicate detection signals of only two systems, but merely indicate that any detection signals of the in-mold sensor 31 and the in-emission sensor 32 can be input to the measuring device 1 Absent.
The measuring device 1 is provided with an n-channel input system, and can simultaneously input n detection signals. Therefore, the detection signals Vs1 of n sensors may be supplied to the measuring device 1 as the in-mold sensors 31, or the detection signals Vs2 of n sensors as the in-ejection sensors 32 may be supplied to the measuring device 1 Good. Furthermore, the detection signals Vs1 and Vs2 of one or more systems as the in-mold sensor 31 and the in-injection sensor 32 may be distributed to n channels and supplied to the measuring device 1.
Which detection signal is to be input to the measuring device 1 depends on the actual structure of the injection molding device 2 or the mold 10, the type, the molded product, the number of mounted sensors, and the contents of the measurement / monitoring to be performed. It may be determined appropriately.
Although not shown, various sensors may be provided in peripheral devices of the injection molding apparatus 2, for example, a temperature controller for cooling, a vacuum drawing apparatus, etc., and detection signals of these sensors are supplied to the measuring apparatus 1 It is also assumed that

Various types of communication can be made between the measuring device 1 and the forming control unit 12. In FIG. 1, as one of the communication, various timing signals STM are transmitted from the forming control unit 12 to the measuring apparatus 1, and a notification signal SI is transmitted from the measuring apparatus 1 to the forming control unit 12. Which indicates that.
One of the timing signals STM is, for example, a signal that indicates the start / end timing of one injection molding cycle. The measuring device 1 can detect a molding period of one cycle by resin injection of one shot by the timing signal STM, and can perform logging and determination of various detection signals during that period.
As other timing signals STM, as described later, a signal indicating the start / end timing of the mold clamping period, a signal indicating the transition timing of the process, or the switching timing of the control method (speed control, pressure control) A signal etc. can be considered.

  The notification signal SI from the measuring device 1 is a signal for notifying the results of various detection information and determination information. For example, it is a signal such as an alarm notification at the time of an abnormal determination in which a molding failure or the like is estimated, or a notification of the rising timing / falling timing of the detection signal waveform. The forming control unit 12 can perform various operation control in accordance with the notification signal SI of these contents.

The measurement results such as the temperature and pressure by the measuring device 1 can be browsed by the computer device 4 connected to the measuring device 1 via the wired or wireless communication path US. The communication path US is realized by, for example, a LAN (Local Area Network) cable or the like.
Management software for managing the measurement of various detection signals by the measuring device 1 is installed in the computer 4. The management software enables a worker or the like to browse the measurement result by the measuring device 1 through the display of the computer device 4.
In addition, workers and the like can perform various numerical settings by setting using management software.
Furthermore, it is possible to record the measurement result in a predetermined storage device such as a hard disk drive (HDD) or a solid state disk (SSD) in the computer device 4.

  FIG. 2 shows an example of display contents of the management screen 90 presented on the screen of the computer 4 by the management software. As shown in the figure, the management screen 90 can display the measurement results of detection signals from various sensors in the form of waveforms, and also allows predetermined values (eg, peak value, integral value, rise timing value, The down timing value etc.) is shown. In addition, operators are provided for the operator to input various settings.

  In FIG. 2, the display of the measurement waveform is such that the drawing direction is from left to right along the time axis, but it can be switched so that it is drawn from right to left. That is, the drawing direction of the waveform can be switched according to the operation of the operator. For example, in an injection molding apparatus, an injection mechanism is disposed on the right side, and there are many apparatuses that perform injection toward the left. As described above, in the case where the injection direction of the resin material is from right to left, if the waveform to be displayed also advances from right to left, it becomes intuitive for the operator to easily understand the measurement contents.

<Configuration of Measurement Device>
FIG. 3 shows the internal configuration of the measuring device 1.
The measuring device 1 is provided with an arithmetic unit 20, an input unit 21, an A / D converter 22, a buffer and IF unit 23, and a memory unit 24.

The input unit 21 can input n channels of the detection signals Vs1 and Vs2. In the example of the figure, eight channel inputs are assumed, and input channels are shown as I1 to I8.
The detection signals Vs1 and Vs2 input to the input channels I1 to I8 are signals obtained by converting the detection information into voltage levels by the dedicated amplifier 3 or the sensor amplifier 33 as described above.
The detection signal Vs1 or Vs2 is input to all or part of the channels I1 to I8. That is, detection signals of one or a plurality of sensors provided in the injection molding apparatus 2 as the in-mold sensor 31 and the in-injection sensor 32 can be simultaneously input to the required channels.

The A / D converter 22 can have the same number of simultaneous inputs as the number of input channels. Therefore, in the example of the figure, it is considered as an A / D converter of 8-channel input.
The A / D converter 22 converts the input detection signals of the channels I1 to I8 into digital data according to the voltage value, and supplies the digital data to the buffer and IF unit 23.

The buffer and IF unit 23 transfers the detection signals of the respective channels I1 to I8 to the operation unit 20, and transmits / receives communication data between the operation unit 20 and the external device (the computer apparatus 4 or the forming control unit 12). It shows in summary.
For example, digital data (detection value Ddet to be described later) of detection signals of a plurality of channels input simultaneously from A / D converter 22 is temporarily buffered by buffer and IF unit 23 while detecting information at each time point The time information (time value Tdet to be described later) at the sampling time of the detection signal is sequentially transferred to the calculation unit 20 as
Further, the buffer / IF unit 23 transmits the notification signal SI from the calculation unit 20 to the forming control unit 12 from the terminal TM2. Further, various timing signals STM from the forming control unit 12 are temporarily taken in from the terminal TM1 to the buffer and IF unit 23, and sequentially transferred to the operation unit 20 together with time information.
Further, various information communication between the operation unit 20 and the computer device 4 is executed by the communication path US connected to the terminal TM3 (for example, a LAN connector terminal) via the buffer and the IF unit 23.

The arithmetic unit 20 is constituted by, for example, a microcomputer having a ROM, a RAM, and a CPU.
In the present embodiment, the calculation unit 20 particularly has functions as a data log processing unit 20a, a determination processing unit 20b, and an evaluation value calculation unit 20c.
The data log processing unit 20a performs processing of storing detection signal values at respective time points input to the input channels of the input unit 21 as log data.
For example, processing is performed to store values for each sample for the detection signals of the channels I1 to I8 converted to digital values by the A / D converter 22.
The evaluation value calculation unit 20c calculates an evaluation value using a detection signal value input to the input unit 21 in a designated period which is a part of a period of one molding cycle of the injection molding apparatus 2.
The determination processing unit 20b performs processing for obtaining the determination result of the injection molding situation using the evaluation value calculated by the evaluation value calculation unit 20c. Further, output processing of the notification signal SI corresponding to the determination processing is performed.
A specific processing example of the computing unit 20 having these functions will be described later.

The memory unit 24 collectively shows a memory area that can be used by the calculation unit 20 as, for example, a ROM, a work memory, a non-volatile memory, or the like.
The memory unit 24 is used, for example, as a storage area of log data by the processing of the data log processing unit 20a. The memory unit 24 is also used as a work area for various arithmetic processing. The memory unit 24 is also used as a storage area of a program for realizing the processing of the arithmetic unit 20, in particular, the processing of the data log processor 20a, the determination processor 20b, and the evaluation value calculator 20c.

<Specified period judgment processing>
An example of determination processing using a detection signal of a designated period in one molding cycle, which is executed in the measuring device 1 of the present embodiment, will be described.

  FIG. 4A shows an example of the waveform of the detection signal detected by the in-mold sensor 31 or the sensor as the in-injection sensor 32. FIG. The vertical axis is the detected value (Ddet), and the horizontal axis is time. For example, the waveform PR of the solid line is the detected value of the pressure sensor, and the waveform TP of the broken line is the temperature inside the mold.

These are, for example, detection signal waveforms in one molding cycle corresponding to one shot of resin injection. Time point T0 to T1 is a period of one molding cycle. In this one molding cycle, for example, the upper mold and the lower mold of the mold 10 are closed, and the resin material is injected into the mold 10 by the cylinder of the injection unit 11. Steps including measurement, cooling, mold opening, and extrusion of molded articles are included.
In order to evaluate the detection signal of one molding cycle, usually, an integral value or an average value of the detection signal at each time point in this period T0 to T1 is used.
However, the meaning of the detection signal is different for each process. For example, although the detected value Ddet of the mold temperature is useful for evaluating the quality of a molded article while the mold 10 is closed, it does not make much sense after the mold 10 is opened.
Further, in order to perform a more appropriate evaluation, it is desirable to evaluate the detected value in a unit period such as a part period in one cycle, for example, a period in which one step or part of the steps are continuous.
Therefore, in the present embodiment, the evaluation value of the detection signal can be calculated for a partial period in one cycle.

For example, FIG. 4B shows time points Ts1 to Te1 as mold clamping periods. That is, this period is a period in which a plurality of steps from mold clamping to mold opening are performed. The integral value or the average value of the detection value Ddet of the detection signal in this period is an evaluation value of only the period in which the mold 10 is closed. For example, if the measuring apparatus 1 acquires the mold clamping period signal of the waveform of FIG. 4B as one of the timing signals STM from the molding control unit 12, it evaluates the integral value or the average value of the detection value Ddet in the period Ts1 to Te1. It can be determined as a value.
Alternatively, when the measuring apparatus 1 receives the timing at time T0, which is the molding start timing of one cycle, from the molding control unit 12 as one of the timing signals STM, it designates that time as the time Ts1 and also determines by predetermined time counting from that time. The evaluation value of the period from time Ts1 to Te1 can be obtained by judging time Te1 at which the timing of mold opening is reached with the passage of time.
Furthermore, the measuring device 1 can also determine the timing from the detection signal waveform. For example, a threshold value thDL for determining the fall of the waveform is set, and the waveform PR of the pressure sensor is monitored. The detected value Ddet of the pressure sensor drops sharply during mold opening. Therefore, the detection value Ddet of the pressure sensor is monitored, and the time when this becomes less than the threshold thDL is determined as the timing (time Te1) at which the mold opening is performed, and the evaluation value of the period from time Ts1 to Te1 is determined. it can.

In FIG. 4C, time points Ts2 to Te2 are periods in which the speed control of resin injection is performed in the injection molding apparatus 2. That is, it is a period during which the injection operation by the cylinder is controlled while monitoring the injection rate.
For example, the molding control unit 12 controls the speed of the injected resin until the resin fills the cavity of the mold 10, and performs control to switch to pressure control after the filling. In that case, it may be desirable to obtain an evaluation value of only the speed control period.
Therefore, if the measuring device 1 acquires the speed control period signal of the waveform in FIG. 4C as one of the timing signals STM from the shaping control unit 12, it evaluates the integral value and the average value of the detection value Ddet in the period from this time Ts2 to Te2. It can be determined as a value.
Alternatively, when the measuring apparatus 1 receives the timing at time T0, which is the molding start timing of one cycle, from the molding control unit 12 as one of the timing signals STM, it designates that time as the time Ts2 and also determines by predetermined time counting from that time. By the passage of time, it is possible to determine the time point Te2 at which the resin fills the cavity in the mold 10, and to obtain the evaluation value of the period from the time point Ts2 to Te2.
Furthermore, the measuring device 1 can also determine the timing from the detection signal waveform. For example, a threshold value thDH for determining the rising of the waveform is set, and the waveform PR of the pressure sensor is monitored. Considering the detection signal of the pressure sensor, the rising timing is the timing immediately after the resin material fills the cavity. It is because the resin is compressed by the injection of the resin after the filling and the pressure becomes high. The detection value Ddet of the pressure sensor rises rapidly immediately after the filling. Therefore, the detected value Ddet of the pressure sensor is monitored, and a point in time when it becomes the threshold thDH or more is determined as the filling timing (point Te2), and an evaluation value of the period from point Ts2 to Te2 can be obtained.

In FIG. 4D, time points Ts3 to Te3 are periods in which pressure control of resin injection is performed in the injection molding apparatus 2. That is, it is a period during which the injection operation by the cylinder is controlled while monitoring the pressure in the mold 10.
As described above, for example, the molding control unit 12 performs control such as switching from speed control to pressure control after the resin fills the cavity of the mold 10. In that case, it may be desired to obtain an evaluation value of only the pressure control period.
Therefore, if the measuring device 1 acquires the speed control period signal of the waveform of FIG. 4D as one of the timing signals STM from the shaping control unit 12, it evaluates the integral value and the average value of the detection values Ddet in the period Ts3 to Te3. It can be determined as a value.
Alternatively, although not shown, when the timing at time T0, which is the molding start timing of one cycle, is received from the molding control unit 12 as one of the timing signals STM, the measuring apparatus 1 elapses a predetermined time by time counting from that time. Thus, it is possible to determine the switching timing (Ts3) to pressure control and the timing (Te3) at which pressure control is ended, and to obtain the evaluation value of the period from time Ts3 to Te3.
Furthermore, the measuring device 1 can also determine the timing from the detection signal waveform. For example, a threshold thDH for determining the rise of the waveform and a threshold thDL for determining the fall are set, and the waveform PR of the pressure sensor is monitored. As described above, the rising timing of the detection signal of the pressure sensor is the timing immediately after the resin material fills the cavity. Therefore, it is possible to monitor the detection value Ddet of the pressure sensor, and determine that the time when this becomes equal to or more than the threshold value thDH is the pressure control start timing (Ts3). The end timing of the pressure control is the timing before the mold 10 is opened, but it may be determined as the end timing (Te3) by judging this from, for example, the value of the detection value Ddet or a change in the value. Thereby, the evaluation value of the period of time point Ts3 to Te3 can be obtained.
Furthermore, as shown in FIG. 4D, when the start timing of the target period does not coincide with the start timing (time T0) of one cycle, the measuring apparatus 1 receives only the start timing of the target period from the forming control unit 12. May be received as one of the timing signals STM.

  Although three examples have been described above as measurement of a partial period, for example, one period of each of the above-described steps, a period of a state in which resin inflow is in progress, and removal of a molded article to the start of the next cycle. There are various possible target periods, such as the period.

Subsequently, a process example of evaluation value calculation and quality determination using the detection value Ddet of a partial period in one cycle as described above will be described.
A process of designating a partial period and generating an evaluation value such as an integral value or an average value using a detection value Ddet of that period (the period designated as the object is referred to as a “specified period” for the sake of description) And processing to judge the quality of molded products and molding operation using evaluation value can be performed in real time while logging detected value Ddet during 1 molding cycle execution, 1 cycle completion time point or later time point etc. Log data can also be obtained.
In other words, during execution of one molding cycle, the detection values Ddet of each of the channels I1 to I8 input and acquired from the input unit 21 at each time point or the detection values Ddet stored as log data by the data log processing unit 20a are used. Thus, evaluation value generation and determination processing for a designated period can be performed at various timings.

FIG. 5 shows a process example of evaluation value calculation and pass / fail judgment using the detection value Ddet of a partial period in one cycle. This is processing executed by the calculation unit 20 of the measuring device 1 by the functions of the data log processing unit 20a, the determination processing unit 20b, and the evaluation value calculation unit 20c.
The following processing is, for example, an example in which evaluation value calculation and determination are performed in real time during one cycle of resin molding. The case where it is performed immediately after completion of one cycle or at a later time will be mentioned later.
In addition, the operation unit 20 performs the process of FIG. 5 in parallel (the actual process may be time division) on the detection signals of the plurality of input channels I1 to I8.

The calculation unit 20 first sets a designated period and calculation content in step S101 of FIG. That is, first, designated periods (time points Ts to Te) as a partial period are set. The time Ts is the start timing of the designated period, and the time Te is the end timing of the designated period. In addition, the contents of the calculation of evaluation value generation in the designated period are set. For example, the content of the evaluation value such as whether to integrate the detected value Ddet or to calculate the average value is set.
These settings are processing that the operation unit 20 recognizes as a process to be executed from this time on, for example, a period or operation content selected by the operator through the operation of the computer device 4.

In step S102, the calculation unit 20 acquires a setting value corresponding to the setting of the process to be executed. For example, threshold values thEH and thEL for the determination process are set. The thresholds thEH and thEL are thresholds for comparing the calculated evaluation values. For example, it is a value indicating the upper limit and the lower limit of the allowable range of the evaluation value.
Note that, as described with reference to FIG. 4, when detecting the rise timing or fall timing of the detection signal waveform, the threshold value thDH, the threshold value thDL, and the like for that are also acquired.
The process of step S102 is a process in which the computing unit 20 recognizes a value set by an operator, for example, by the operation of the computer device 4 and holds the value as a value to be used for a process to be performed from now on.
That is, in steps S101 and S102, the calculation unit 20 performs various operation settings by communication with the computer device 4.

  When preparation for the calculation / determination process is completed in steps S101 and S102, the calculation unit 20 waits for the start timing in step S103. For example, as one of the timing signals STM from the forming control unit 12, the start timing signal of the forming cycle is monitored.

After recognizing the start timing (that is, time point T0) of the injection molding operation of one cycle, the operation unit 20 proceeds to step S104 and thereafter.
In step S104, the end timing of one molding cycle is monitored. The arithmetic unit 20 monitors, for example, an end timing signal of one cycle as one of the timing signals STM. The end timing may be managed by the operation unit 20 by the internal timer count as a point in time when a predetermined time has elapsed from the start timing.

If the end timing is recognized, the operation unit 20 confirms whether or not the monitoring is ended in step S105, and if the monitoring is to be continued, the start timing is waited in step S103. Even while waiting for the start timing, the computing unit 20 checks in step S105 whether the monitoring has ended or is continued.
Arithmetic unit 20 detects the instruction of the end of monitoring by the operation using the computer device 4 of the worker, the end of the monitoring operation of the specified number of times, or the end of the injection molding by communication from the injection molding apparatus 2. In step S105, it is determined that monitoring has ended. In that case, the calculation unit 20 ends the process of FIG.

During the period of one molding cycle, the process proceeds from step S104 to step S110.
During the molding cycle, the computing unit 20 continues the logging process by the data log processing unit 20a. That is, the storage of the detection value Ddet (and the time value Tdet indicating the timing at which the detection value Ddet is obtained) obtained at each sample timing is performed for each channel. This logging process is continued until the end timing is detected in step S104.
That is, during one molding cycle, the calculation unit 20 repeatedly performs acquisition of the detection value Ddet and the time value Tdet and storage as log data in step S110.

By repeating steps S110 to S118, all detection values Ddet and time values Tdet obtained at each timing are stored as log data.
Since detection signals of various sensors in one molding cycle are stored as log data as described above, using this log data enables evaluation of the operation of the injection molding apparatus 2, verification of molded articles, etc. even at a later time. It can be carried out.

Along with the acquisition of the detection value Ddet, the processes after step S111 are performed. In step S111, the calculation unit 20 checks whether the current detection value Ddet is a detection value within a designated period. That is, it is determined whether the time value Tdet corresponds to a point in time from Ts to Te.
Assuming that the time value Tdet and the time points Ts and Te are respectively set such that the start time point T0 of one molding cycle is 0, it is determined whether or not Ts ≦ Tdet ≦ Te.
If this is the case, the currently detected value Ddet is a detected value within a designated period. Therefore, the process proceeds to step S112, and the calculation unit 20 calculates an evaluation value using the detection value Ddet. That is, the current detection value Ddet is also reflected on the integral value and the average value. Then, the process returns to step S104.

As for the timing as the time points Ts and Te, as described in FIG. 4B, FIG. 4C, and FIG. 4D described above, recognition by the timing signal STM, recognition by internal timer counting, recognition by monitoring of detection signal waveform, or Recognize these combinations.
In practice, it is also conceivable that a time lag occurs between the time value Tdet at which the detection value Ddet is acquired (the timing at which the detection unit D21 is input) and the processing timing acquired by the calculation unit 20. There are also times when the times Ts and Te are not determined in practice. Therefore, the determination condition of Ts ≦ Tdet ≦ Te described above is theoretical for explanation.
In fact, it is determined that the present detection value Ddet is not within the designated period when the time point Ts has not been recognized and determined after the start of one molding cycle.
After the time point Ts is recognized and determined, when the time point Te is not yet recognized and determined, if Ts ≦ Tdet, the detection value Ddet becomes data within a designated period.
If Ts ≦ Tdet ≦ Te after the time point Te is recognized and determined, the detection value Ddet becomes data within a designated period.

If the currently detected value Ddet is not data within the designated period, the operation unit 20 proceeds from step S111 to step S113, and determines whether or not it is the end timing of the designated period. This is a determination as to whether the value up to the previous detection value Ddet is within the designated period and is outside the designated period (no longer than Tdet ≦ Te) this time. That is, it is checked whether all of the detection values Ddet that are the targets of the calculation of the evaluation value and the determination have been reflected in the calculation of the evaluation value.
In the processing when data (Tdet <Ts) when the designated period has not yet been reached or when data after the designated period has already been processed after step S114 is acquired, The process returns from step S113 to step S104.

When it is detected that it is the end timing of the designated period, in step S114, the computing unit 20 fixes the computed value of the evaluation value performed in step S112 and stores it as one of the log data. For example, it is stored in a predetermined area of the memory unit 24.
Then, in step S115, the calculation unit 20 performs quality determination using the evaluation value. For example, using threshold values thEH and thEL, it is confirmed whether the evaluation value is thEH ≧ evaluation value 値 thEL.
If this determination condition is satisfied, the process proceeds from step S116 to S117 as OK determination, and a notification signal SI of determination OK is transmitted to the forming control unit 12, and the computer apparatus 4 is notified of determination OK.
At this stage, the determination result information that the determination is OK may be stored as log data together with identification information (information on the number of cycles) of the molding cycle this time.
On the other hand, if the judgment condition of thEH ≧ evaluation value ≧ thEL is not satisfied, the process proceeds from step S116 to S118 as an error judgment, and a judgment error notification signal SI (alarm signal) is transmitted to the forming control unit 12. Report a judgment error to.
At this stage, determination result information that is a determination error (forming failure) may be stored as log data together with identification information of the current forming cycle.

As described above, when the processing of the calculation unit 20 is performed, generation of an evaluation value in a designated period in one molding cycle and quality determination based on the evaluation value are performed.
Steps S114 to S118 may be performed at the end of one molding cycle, for example, immediately after the end timing is detected in step S104.
Further, it is also possible to set a plurality of designated periods and to generate and judge an evaluation value in the same process for each of them.
Moreover, although it was set as the example which performs production | generation and determination of evaluation value in 1 cycle execution of resin molding in FIG. 5 in real time, it is not restricted to this.
In the case where it is performed immediately after the completion of one cycle or at a later time, the log data of the detection value Ddet and the time value Tdet for the input channel to be monitored are sequentially acquired from the memory unit 24 while steps S111 to S118 in FIG. It is sufficient to perform the process of

<Summary and modification>
The measuring apparatus 1 of the above embodiment is provided with the input part 21 which can input the detection signal of the sensor (The in-mold sensor 31 and the sensor 32 in injection | emission part) arrange | positioned at the injection molding apparatus 2. FIG. In addition, the calculation unit 20 of the measuring device 1 uses the detection signal value (Ddet) input to the input unit 21 in the designated period which is a partial period within the period of one molding cycle by the injection molding device 2 and the evaluation value And a determination processing unit 20b for determining the determination result of the injection molding situation using the evaluation value calculated by the evaluation value calculation unit 20c.
One molding cycle of injection molding includes, for example, steps of mold clamping, injection, holding pressure, measurement / cooling, mold opening, extrusion, and the like. In some cases, other steps are included. And the meaning of the detection signal value detected and measured by the sensor in each of these steps is different. Therefore, in the present embodiment, the period to be evaluated is designated, and the evaluation value is obtained from the detection signal value in the designated period. For example, an integral value or an average value of detection signal values within a designated period is used as an evaluation value. This enables, for example, evaluation and determination for each period corresponding to each process or the like.
Therefore, the operation of the molding cycle of the injection molding apparatus 2 and the quality judgment of the molded product can be performed more accurately. In particular, evaluation of a specified period can be appropriately performed, such as a process unit in one molding cycle.

Further, the arithmetic unit 20 of the measuring device 1 performs data processing for storing the detection signal value (Ddet) at each time point input to the input unit 21 as log data during a period of one molding cycle by the injection molding device 2 A log processing unit 20a is provided. The data log processing unit 20a stores the evaluation value calculated by the evaluation value calculation unit 20c as log data (S114 in FIG. 5).
As described above, the measurement apparatus 1 functions as a data logger for detection signal values of various sensors provided in the injection molding apparatus 2 such as a pressure sensor and a temperature sensor, thereby enabling ex post evaluation. . That is, by storing the detection value Ddet in the molding cycle as log data, it is possible to extract the detection value Ddet of a partial period (designated period) later and obtain the evaluation value.
In addition, storing evaluation values calculated using detection signal values in a designated period can provide information useful for various evaluations, operation analysis, adjustments, etc., such as analysis of evaluation values in a plurality of cycles, for example. .
Also, storing the determination result using the evaluation value as log data is also useful for evaluation or adjustment at a later point in time. In particular, it also means that the determination processing that has been executed once is not wasted.
Therefore, the measuring device 1 may be used for real-time monitoring in a molding process, or may perform calculation or quality determination of various measurement values for the purpose of subsequent process analysis or the like.

The measuring device 1 can also determine, for example, the start timing or the end timing of the designated period in the period of one molding cycle, based on a signal supplied from the outside.
For example, it has been described that the start timing (Ts) and the end timing (Te) of the designated period are recognized by the timing signal STM from the injection molding apparatus 2. Other than this, the start / end timing of the designated period may be grasped by a signal from the computer 4 or the like that has started up the corresponding software.
Thus, it is possible to grasp the designated period by the external trigger. In particular, by obtaining the timing signal of each operation process of the injection molding apparatus 2, the period such as a specific process can be accurately grasped, and an appropriate evaluation value or determination result can be obtained.

The measuring apparatus 1 can also determine the start timing or end timing of the designated period in the period of one molding cycle based on time management from the start of the one molding cycle or monitoring of the detection information value. Some of the steps of the injection molding apparatus 2 have a fixed time from the start to some extent. When targeting such a process, the designated period can be determined by the time count from the start of the molding cycle. In addition, there are some processes in which characteristics of the detection value of the sensor are generated depending on each process. When such a process is used as the designated period, the start timing or the end timing of the designated period can be determined by the change of the detection signal.
By performing such a designated period determination, even if an external signal can not be obtained, it is possible to appropriately perform calculation calculation of the evaluation value in the designated period, determination of good or bad, and the like. Accordingly, the measuring device 1 can widely cope with the difference in the configuration of the injection molding device 2 to be connected.

For example, the start timing of the designated period may be obtained by an external signal, and the end timing of the designated period may be grasped from the time count.
Alternatively, the start timing of the designated period may be obtained by an external signal, and the end timing of the designated period may be grasped by the change of the detection signal thereafter. For example, conditions may be set such that the detection value Ddet exceeds a predetermined threshold, is lower than the threshold, or falls outside a predetermined numerical range. As described above, there are various methods for recognizing the start / end timing of the designated period.

In the embodiment, a certain continuous partial period of one molding cycle is assumed as the designated period, but it is also possible to set intermittent multiple periods as one designated period and obtain an evaluation value.
For example, when it is considered that the processes A, B, C, D and E are sequentially performed as the process of one molding cycle, the process B period and the process E period are one designated period, and the processes B and E are one designated period As an example, it is an example to calculate the evaluation value.
For this purpose, for example, the timing detected in step S113 of FIG. 5 may be set as the timing at which the second designated period has come. Alternatively, steps S114 to S118 may be performed at the end of one cycle period.

Furthermore, the present invention should not be limited to the above-described specific examples, and various modifications can be considered.
The configuration of the injection molding apparatus 2 can be considered in various ways. The configuration of the measuring device 1 is also the same.
A processing example is also merely an example in the calculation unit 20 of the measuring device 1 shown in FIG. 5, and various specific processing examples can be considered.
A variety of sensors (in-mold sensor 31 and in-injection sensor 32) mounted on the injection molding apparatus 2 are conceivable. That is, the measuring device 1 measures various pressures other than the pressure measurement of the resin material in the injection unit 11 and the mold 10 by the pressure sensor and the measurement of the molding material and the mold surface temperature based on the detection signal of the temperature sensor. Applicable to measurement. For example, flow velocity measurement of molding material based on detection signal of light sensor etc., flow front measurement based on detection signal of infrared sensor etc. (eg measurement of time until molding resin reaches predetermined position in cavity) position sensor etc. The present invention can also be suitably applied to detection signals of various sensors in the case of performing other measurements relating to injection molding, such as measurement of positional deviation between dies at the time of mold closing based on detection signals (measurement of mold opening).

<Program and Storage Medium>
The program according to the embodiment of the present invention is a program that causes the operation unit 20 (an operation processing device such as a microcomputer) in the measuring device 1 to execute the functions as the determination processing unit 20b and the evaluation value calculation unit 20c.

  The program according to the embodiment includes an acquiring step (S110) of acquiring a detection signal of a sensor (31, 32) disposed in the injection molding apparatus 2, and a partial period within one molding cycle period of the injection molding apparatus 2. A calculation step (S112) for calculating an evaluation value using the detection signal value (detection value Ddet) in the designated period determined, and a determination step for determining a determination result of the injection molding situation using the evaluation value calculated in the calculation step It is a program which makes an arithmetic processing unit execute (S115). That is, it is a program for executing the process of FIG.

Such a program facilitates the manufacture of the measuring device 1 of the present embodiment.
Such a program can be stored in advance in a storage medium incorporated in an apparatus such as a computer device, a ROM in a microcomputer having a CPU, or the like. Alternatively, it can be stored (stored) temporarily or permanently in a removable storage medium such as a semiconductor memory, a memory card, an optical disk, a magneto-optical disk, or a magnetic disk. Also, such removable storage media can be provided as so-called package software.
Further, such a program can be installed from a removable storage medium to a personal computer or the like, and can also be downloaded from a download site via a network such as a LAN or the Internet.

In addition, the program of such an embodiment can be installed in the computer device 4 so that the computer device 4 has the function of the measuring device 1.
For example, the dedicated amplifier 3 and the computer device 4 are directly connected by the connector. A detection signal of one or more input channels is supplied to the computer 4 via the dedicated amplifier 3. Then, when the software including the program is activated in the computer device 4, the computer device 4 executes the processing of FIG. 5. That is, the detection signal of the sensor (31, 32) is acquired, and the detection signal value (detection value Ddet) in the designated period which is a partial period within the period of one molding cycle by the injection molding apparatus 2 is used to The calculation is performed, and the evaluation value is used to obtain the determination result of the injection molding situation. Thereby, the measuring device 1 can be realized using the computer device 4 such as a personal computer.

  DESCRIPTION OF SYMBOLS 1 ... measurement apparatus, 2 ... injection molding apparatus, 3 ... dedicated amplifier, 4 ... computer apparatus, 10 ... mold, 11 ... injection part, 12 ... molding control part, 20 ... calculation part, 20a ... data log processing part, 20b ... Determination processing unit, 20c ... Evaluation value calculation unit, 21 ... Input unit, 22 ... A / D converter, 23 ... Buffer and IF unit, 24 ... Memory unit, 31 ... Mold sensor, 32 ... Injection section sensor, 33: Sensor amplifier, 100: Measurement system

Claims (5)

An input unit capable of inputting a detection signal of a sensor disposed in the injection molding apparatus;
The evaluation value is calculated using the detection signal value input to the input unit in a specified period which is a mold clamping period or a speed control period which is a partial period within one molding cycle period by the injection molding apparatus. An evaluation value calculation unit,
A determination processing unit that determines a determination result of the injection molding situation using the evaluation value calculated by the evaluation value calculation unit ;
The measuring apparatus which ends the said designated period based on the change of a detection signal value or the said detection signal value . A data log processing unit is provided which performs processing of storing detection signal values at respective time points input to the input unit as log data during a period of one molding cycle by the injection molding apparatus.
The measuring apparatus according to claim 1, wherein the data log processing unit performs processing of storing the evaluation value calculated by the evaluation value calculation unit as log data. The measuring device according to claim 1, wherein the start timing or the end timing of the designated period in one molding cycle is determined based on a signal supplied from the outside. An acquisition step of acquiring a detection signal of a sensor disposed in the injection molding apparatus;
A detection signal value in a designated period which is a mold clamping period or a speed control period which is a partial period within one molding cycle period by the injection molding apparatus and which ends based on a detection signal value or a change in the detection signal value Operation step to calculate the evaluation value using
A determination step of determining a determination result of an injection molding situation using the evaluation value calculated in the calculation step. An acquisition step of acquiring a detection signal of a sensor disposed in the injection molding apparatus;
A detection signal value in a designated period which is a mold clamping period or a speed control period which is a partial period within one molding cycle period by the injection molding apparatus and which ends based on a detection signal value or a change in the detection signal value Operation step to calculate the evaluation value using
A determination step of determining a determination result of an injection molding situation using the evaluation value calculated in the calculation step;
A program that causes an arithmetic processing unit to execute

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