JP6494113B2 - Measuring device, measuring method, program - Google Patents

Description

  The present invention relates to a measuring device, a measuring method, and a program for monitoring mass production such as an injection molding device.

JP 2008-36975 A

2. Description of the Related Art A measurement system that measures a detection signal of a sensor installed in an injection molding apparatus with a measurement device is known. This measurement system uses a temperature sensor, pressure sensor, etc. provided in an injection molding machine, a mold, or a molding peripheral device (for example, a temperature controller for cooling, a vacuuming device, etc.), and the behavior of a molding material such as resin. Can be detected and output as a waveform to an information processing apparatus such as a personal computer in real time.
The measurement data can be used for various purposes such as setting of optimum molding conditions, automatic selection of defective products, quality control, and die evaluation.
In the measurement system, it is also possible to monitor the measurement value based on the detection signal of the sensor and output an alarm 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 mass production monitoring technique in injection molding, there is a peak value management of a detection signal of a sensor being measured.
Patent Document 1 discloses a technique in which a sensor provided in an injection molding device detects the pressure of resin in a cavity, and a detection signal of the sensor is sampled by an amplifier device.

Incidentally, more appropriate processing is required for the monitoring processing executed by the measuring device connected to the injection molding device. Specifically, there are monitoring suitable for a multi-gate type mold and a multi-cavity type mold, and monitoring corresponding to temporal and environmental fluctuations.
Therefore, an object of the present invention is to provide a technique capable of appropriately executing monitoring suitable for these multi-gate type / multi-cavity type molds and monitoring corresponding to temporal or environmental fluctuations.

The measuring device according to the present invention has a plurality of input channels, and can be input simultaneously to the input unit that can input detection signals of a plurality of sensors arranged in the injection molding apparatus, and to each input channel of the input unit. The data log processing unit that stores the detection signal value at each time point as log data and the detection timing of the detection signal of one or a plurality of input channels, and the process using the detected specific timing e Bei a determination processing unit for determining the determination result, wherein the determination processing section, the detection signals of a plurality of input channels, to detect the first timing detection signal is smaller than the first threshold value as the specific timing, a plurality of channels It is determined whether or not each of the first timings is between a predetermined first time point and a second time point .
Various sensors deployed in an injection molding device, such as a measurement device as a data logger for detection signal values such as pressure sensors and temperature sensors, determine events in various molding processes, and determine good / bad molded products To do. For this reason, detection signals of a plurality of channels can be input, and determination using a specific timing of a detection signal of one channel or a specific timing of detection signals of each of a plurality of channels is performed.
Further, considering that, for example, detection signals of n parts where resin inflow is simultaneously performed in the injection molding apparatus are input from the first input channel to the nth input channel, the detection signals are essentially omitted from the detection signals. A simultaneous change, for example, a rising edge of the detection signal value waveform should be observed. This rising timing is detected as a first timing at which the detection signal is equal to or higher than the first threshold. There are various factors that cause the rise timing to deviate, but the timing deviation is an index for determining the quality of a molded product. If the first timings (rising timings) of the detection signals of the plurality of input channels are all between the first time point and the second time point, it can be evaluated that the rising timings of the input channels are aligned. Note that the first time and the second time are, for example, the time when a predetermined time has elapsed since the start of resin inflow.

The measuring device according to the present invention has a plurality of input channels, and can be input simultaneously to the input unit that can input detection signals of a plurality of sensors arranged in the injection molding apparatus, and to each input channel of the input unit. The data log processing unit that stores the detection signal value at each time point as log data and the detection timing of the detection signal of one or a plurality of input channels, and the process using the detected specific timing A determination processing unit that obtains a determination result, wherein the determination processing unit detects a first timing at which the detection signal is equal to or greater than a first threshold as the specific timing for detection signals of a plurality of input channels, It is determined whether or not each of the first timing shifts is within a predetermined time width.
The first timing shift is determined for each input channel. For example, the elapsed time from the start of resin injection is not determined, and the relative first timing shift of each input channel is monitored.

In the measurement apparatus described above, the determination processing unit detects, as the specific timing, a second timing at which a detection signal input to the input unit is equal to or lower than a second threshold, and the second timing is a predetermined first time point. It is conceivable to determine whether or not it is between the first time point and the second time point.
It is determined whether or not the second timing (falling timing) is within a predetermined elapsed time range for one input channel or a plurality of input channels.

In the measurement device described above, the determination processing unit detects a first timing at which the detection signal is equal to or higher than the first threshold for the detection signal of the input channel, or a second timing at which the detection signal is equal to or lower than the second threshold. Thus, it is conceivable to perform a process of outputting a notification signal at the first timing or the second timing.
As the first timing / second timing, for example, the timing of rising or falling of the detection signal is notified to the control unit of the injection molding apparatus.

The measurement method according to the present invention is a timing detection step of detecting a specific timing with respect to detection signals of one or a plurality of sensors provided in an injection molding apparatus, which are input to all or a part of a plurality of input channels of the measurement apparatus. If, e Bei a determination step by treatment with a specific timing of detection obtains the determination result of the injection molding conditions, a, in the determination step, the detection signals of a plurality of input channels, the detection signal as the specific timing first A first timing that is equal to or greater than a threshold is detected, and it is determined whether or not the first timing of each of a plurality of channels is between a predetermined first time point and a second time point .
In addition, the measurement method according to the present invention is a timing for detecting a specific timing with respect to detection signals of one or more sensors provided in the injection molding apparatus, which are input to all or a part of the plurality of input channels of the measurement apparatus. A detection step, and a determination step for obtaining a determination result of an injection molding situation by processing using the detected specific timing. In the determination step, a detection signal is detected as the specific timing for the detection signals of a plurality of input channels. A first timing that is equal to or greater than one threshold is detected, and it is determined whether or not the shift of the first timing of each of a plurality of channels is within a predetermined time width.
The program according to the present invention is a program that causes an arithmetic processing unit to execute the processing of each step described above.

  According to the present invention, it is possible to appropriately execute measurement / monitoring of detection signals suitable for multi-gate type / multi-cavity type molds, monitoring corresponding to temporal or environmental fluctuations, and the like.

It is the block diagram which showed the structure of the injection molding measurement system of embodiment. It is explanatory drawing of a multi cavity and a multi gate. It is explanatory drawing of the display screen by the management software of embodiment. It is a block diagram of the measuring device of an embodiment. It is explanatory drawing of the monitoring process of the rise timing of embodiment. It is explanatory drawing of the monitoring process of the fall timing of embodiment. It is a flowchart of the monitoring process of embodiment. It is a flowchart of the monitoring process of embodiment. It is a flowchart of the monitoring process of embodiment. It is a flowchart of the monitoring process of embodiment. 6 is a flowchart of timing signal output processing according to the embodiment. It is explanatory drawing of the timing signal output process of embodiment.

<Configuration of measurement system>
Embodiments according to the present invention will be described below. First, an injection molding measuring system 100 (also simply referred to as “measuring system 100”) including a measuring device 1 and an injection molding device 2 according to an embodiment of the present invention will be described.
FIG. 1 is a diagram showing an outline of the configuration of the measurement system 100.
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.

  As generally known, the injection molding apparatus 2 includes a mold 10 disposed at a predetermined position, an injection unit 11 having a mechanism for injecting and filling a resin material into the mold 10, and an injection unit 11. The molding control unit 12 controls the injection operation and the opening / closing operation of the mold 10 to execute and control a series of injection molding operations.

For example, an upper mold and a lower mold are arranged in the mold 10, and the upper mold is opened and closed by a mechanism provided in the injection unit 11 with respect to the lower mold arranged in the molding stage, for example. In a state where the upper mold is closed with respect to the lower mold, for example, a resin material is injected into the gate provided in the upper mold by the injection cylinder of the injection unit 11 and the cavity in the mold 10 is filled with the resin material. The Then, after filling, when the required time elapses, 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, there are a temperature sensor that detects the temperature of the filled resin material, a pressure sensor that detects the pressure of the resin material, and the like.

The injection unit 11 is provided with mechanisms necessary for injection molding, such as a resin material injection mechanism, a mold clamping mechanism, an injection cylinder mechanism, and an injection motor for the mold 10.
The injection unit 11 is provided with an in-injection sensor 32 and a sensor amplifier 33. Examples of the in-injection sensor 32 include a temperature sensor that detects the temperature of the resin material during the injection process, a pressure sensor that detects pressure, and a position sensor that calculates the injection speed.

  In the present embodiment, the mechanism and structure of the injection unit 11, such as a cylinder structure, a mold clamping mechanism structure, a runner structure, a nozzle structure, a heater arrangement, a motor arrangement, a material input mechanism, and the like are not particularly limited. It may be of a type.

In addition, the measurement system 100 of the present embodiment is not particularly limited with respect to the structure and type of the mold 10, and can correspond to various types. However, the measurement system 100 particularly supports multi-cavity type and multi-gate type molds 10. It is supposed to be possible.
FIG. 2A schematically shows a multi-cavity mold 10. A plurality of (six in the figure) cavities C are formed in the mold 10, and a resin material is simultaneously injected into each cavity C by one shot of resin injection by the injection unit 11. Thus, a plurality of molded products can be molded at the same time. The resin inflow paths to the cavities C indicated by the broken lines have the same conditions and the same distance, and are formed so that the difference in the inflow paths does not affect the temperature and pressure of the resin material.
In-cavity sensors 31 are arranged in the cavities C, respectively, so that temperature and pressure can be detected.
FIG. 2B schematically shows a multi-gate type mold 10. The mold 10 is provided with a plurality of gates G (injection holes), and a resin material is injected from each gate G into an internal cavity. The efficiency of resin material injection is improved by using a multi-gate. Also in this case, the resin flow paths to the respective gates G schematically indicated by broken lines have substantially the same distance and the same conditions. Although not shown, an in-mold sensor 31 is arranged corresponding to each gate G.
A multi-gate and multi-cavity mold 10 is also assumed.

The molding control unit 12 includes, for example, a microcomputer having a ROM (Read Only Memory), a RAM (Random Access Memory), and a CPU (Central Processing Unit).
The molding control unit 12 performs drive control of each unit by the injection unit 11. For example, injection motor control, mold stage operation control, mold opening / closing mechanism operation control, nozzle opening / closing mechanism operation control, heater control, material charging operation control, and the like are performed. This causes a series of injection molding operations to be executed.

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 device 2, for example. Then, it is supplied to the measuring device 1 as a detection signal Vs1 converted into a voltage signal.
The detection signal S2 of the in-injection unit sensor 32 is converted into a voltage value by a sensor amplifier 33 provided in the injection unit 11, for example. Then, it is supplied to the measuring device 1 as a 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 signals from the in-mold sensor 31, and the detection signal Vs2 is a detection signal from the in-injection section sensor 32. It is a generic name. Of course, a case where a plurality of sensors are arranged as the in-mold sensor 31 and a case where a plurality of sensors are arranged as the in-mold sensor 32 are also assumed.
Therefore, the detection signals Vs1 and Vs2 do not indicate detection signals of only two systems, but merely indicate that any detection signal of the in-mold sensor 31 and the in-injection unit sensor 32 can be input to the measuring apparatus 1. Absent.
The measuring apparatus 1 is provided with an n-channel input system and can simultaneously input n detection signals. Therefore, the detection signal Vs1 of n sensors as the in-mold sensor 31 may be supplied to the measuring device 1, or the detection signal Vs2 of n sensors as the in-injection sensor 32 may be supplied to the measuring device 1. Good. Further, one or a plurality of detection signals Vs1 and Vs2 as the in-mold sensor 31 and the in-injection section sensor 32 may be distributed to n channels and supplied to the measuring device 1.
The type of detection signal input to the measuring device 1 depends on the actual structure, type, molded product, number of mounted sensors, contents of measurement / monitoring to be executed, etc. What is necessary is just to be decided suitably.
Although not shown in the drawings, various sensors may be provided in peripheral devices of the injection molding apparatus 2, such as a temperature controller for cooling and a vacuuming apparatus, and the detection signals of these sensors are supplied to the measuring apparatus 1. It is also assumed that

Various communications are possible between the measuring apparatus 1 and the molding control unit 12. In FIG. 1, as one of the communications, a molding timing signal STM is transmitted from the molding controller 12 to the measuring device 1, and a notification signal SI is transmitted from the measuring device 1 to the molding controller 12. It is shown that.
The molding timing signal STM is a signal for notifying the start / end timing of one cycle of injection molding, for example. The measuring apparatus 1 can detect a molding period of one cycle by one shot of resin injection using the molding timing signal STM, and perform logging and determination of various detection signals during that period.
The notification signal SI is a signal for notifying the results of various types of detection information and determination information. For example, it is a signal such as an alarm notification at the time of abnormality determination in which a molding defect or the like is estimated, or a notification of the rising timing / falling timing of the detection signal waveform. The molding control unit 12 can perform various operation controls according to the notification signal SI having these contents.

Measurement results such as temperature and pressure by the measuring device 1 can be viewed by the computer device 4 connected to the measuring device 1 through a wired or wireless communication path US. The communication path US is realized by, for example, a LAN (Local Area Network) cable.
Management software for managing the measurement of various detection signals by the measuring device 1 is installed in the computer device 4. With this management software, a worker or the like can view the measurement result obtained by the measurement device 1 via the display of the computer device 4.
In addition, workers and the like can perform various numerical settings by setting using management software.
Further, the measurement result can be recorded in a predetermined storage device such as an HDD (Hard Disk Drive) or an SSD (Solid State Disk) in the computer device 4.

  FIG. 3 shows a display content example of the management screen 90 presented on the screen of the computer device 4 by the management software. As shown in the figure, on the management screen 90, the measurement results of detection signals from various sensors can be displayed as waveforms, and predetermined numerical values (for example, peak value, integral value, rise timing value, rise time, etc.) of each detection signal can be displayed. Falling timing value, etc.). Operators are provided for the operator to input various settings.

In FIG. 3, 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 the drawing is drawn from right to left. That is, the waveform drawing direction can be switched in accordance with the operator's operation. For example, in an injection molding apparatus, an injection mechanism is arranged on the right side, and there are many apparatuses that inject toward the left. As described above, when the injection direction of the resin material is from right to left, if the waveform to be displayed also proceeds from right to left, the measurement contents can be easily understood by the operator.

<Configuration of measuring device>
FIG. 4 shows the internal configuration of the measuring apparatus 1.
The measuring device 1 is provided with a calculation 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 for the detection signals Vs1 and Vs2. In the example shown in the figure, an 8-channel input is assumed, and the input channels are indicated 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. For example, the detection signals Vs1 of the six in-mold sensors 31 arranged in the six cavities C in the multi-cavity mold 10 of FIG. 2A are input as channels I1 to I6, respectively, The detection signals Vs1 of the three in-mold sensors 31 arranged at the three gates G in the gate type mold 10 are input as channels I1 to I3, respectively. In addition, detection signals from one or more sensors of the in-injection unit sensor 32 are also input to predetermined channels.

The A / D converter 22 can input the same number as the number of input channels. Accordingly, in the example shown in the figure, an 8-channel input A / D converter is used.
The A / D converter 22 converts the input detection signals of the channels I <b> 1 to I <b> 8 into digital data corresponding to the voltage value, and supplies the digital data to the buffer and IF unit 23.

The buffer and IF unit 23 is a part for passing detection signals of the channels I1 to I8 to the calculation unit 20 and transmitting / receiving communication data between the calculation unit 20 and external devices (the computer device 4 and the molding control unit 12). Summarized.
For example, digital data (detection value Ddet described later) of the detection signals of a plurality of channels input simultaneously from the A / D converter 22 is temporarily buffered by the buffer and IF unit 23 and detected at each time point. Are sequentially transferred to the arithmetic unit 20 together with time information (time value Tdet described later) at the time of sampling of the detection signal.
The notification signal SI from the arithmetic unit 20 is transmitted from the terminal TM2 to the molding control unit 12 by the buffer and IF unit 23. The molding timing signal STM from the molding control unit 12 is once fetched from the terminal TM1 into the buffer and IF unit 23 and sequentially transferred to the calculation unit 20 together with time information.
Various kinds of information communication between the arithmetic unit 20 and the computer apparatus 4 are executed by the communication path US connected to the terminal TM3 (for example, a LAN connector terminal) via the buffer and IF unit 23.

The arithmetic unit 20 is constituted by a microcomputer having, for example, a ROM, a RAM, and a CPU.
In the present embodiment, the arithmetic unit 20 particularly has functions as a data log processing unit 20a and a determination processing unit 20b.
The data log processing unit 20a performs processing for storing the detection signal value at each time point input to each input channel of the input unit 21 as log data.
For example, a process of storing a value for each sample for each detection signal of each of the channels I1 to I8 converted into a digital value by the A / D converter 22 is performed.
The determination processing unit 20b detects various specific timings with respect to the detection signal input to the input unit 21, determines the injection molding situation determination result by processing using the detected specific timings, and notifications accordingly The signal SI is output.
Specific processing examples of the arithmetic unit 20 having these functions will be described later.

The memory unit 24 collectively indicates a memory area that can be used by the arithmetic unit 20 as, for example, a ROM, a work memory, a nonvolatile memory, or the like.
The memory unit 24 is used, for example, as a storage area for log data by the processing of the data log processing unit 20a. The memory unit 24 is used as a work area for various arithmetic processes. The memory unit 24 is also used as a program storage area for realizing the processing of the arithmetic unit 20, particularly the processing of the data log processing unit 20a and the determination processing unit 20b.

<Decision processing by timing management>
An example of determination processing based on timing management executed in the measurement apparatus 1 of the present embodiment will be described.
First, for example, assuming a multi-cavity mold 10, an example of monitoring the inflow timing of the resin material into each cavity C will be described.

First, the determination based on the elapsed time management of the inflow timing will be described with reference to FIGS. 5A and 5B.
5A and 5B show waveforms of detection signals of sensors provided in the respective cavities C. FIG. The vertical axis represents the detection value (Ddet), and the horizontal axis represents time. Here, it is assumed that four cavities C are provided in the mold 10, and four waveforms, for example, detection signal waveforms of the pressure sensor are shown as detection values of the in-mold sensor 31 attached to each cavity C. . For example, it is a detection signal waveform in one molding cycle corresponding to one shot of resin injection.

It is empirically known that when the molded product becomes a non-defective product, the inflow timing into each cavity C is substantially the same. Therefore, if the inflow timing into each cavity C is detected from each detection signal, the non-defective product / defective product can be determined based on the result.
The detection value of the pressure sensor arranged in the cavity C is substantially zero during the period when the resin is flowing in, but rapidly increases immediately after the resin is filled into the cavity C. This is because the resin is injected in the filled state and the resin is compressed in the cavity C at once.
Then, the rising timing of the detection signal waveform is the timing immediately after the resin is filled, and corresponds to the elapsed time from the start of filling to the filling.
Since the elapsed time until the resin material is filled is substantially equivalent to the inflow timing, if the elapsed time until the rising edge of the detection signal waveform is substantially equal in each cavity C, it can be evaluated that the inflow timing is aligned. .

In order to detect the rising timing, a threshold thDH is set. Further, the elapsed times Ts and Te are set as a range that is an appropriate elapsed time as the rising timing.
5A and 5B illustrate the threshold value thDH and the elapsed times Ts and Te. The elapsed times Ts and Te are the shortest and longest values allowable as the elapsed time from the injection start time T0 to the rising timing. For example, if Ts = 1 second and Te = 2 seconds, it is sufficient that the resin is filled between the lapse of 1 second and the lapse of 2 seconds from the start of injection.
The threshold value thDH is a setting value for detecting the rising timing, and the time when the detected value Ddet is equal to or higher than the threshold value thDH is set as the rising timing.
The threshold thDH and the elapsed times Ts and Te are input by the operator on the computer device 4 by an operation using the management screen 90 as shown in FIG. 3, for example, and the calculation unit 20 sets them as processing set values. Receive and get.

FIG. 5A shows an example in which a molded product is determined to be a non-defective product.
In each detection signal waveform, the timing at which the detection value Ddet is equal to or greater than the threshold thDH is all within the range from the elapsed time Ts to Te. In this case, it is evaluated that the inflow timing into each cavity C is substantially the same, and the molded product is determined to be a non-defective product.
On the other hand, FIG. 5B shows a state in which the rising timing of each detection signal waveform is greatly shifted. In some waveforms, the timing at which the detection value Ddet is greater than or equal to the threshold thDH is in the range from the elapsed time Ts to Te, but in other waveforms, the timing is outside the range from the elapsed time Ts to Te. .
In this case, the inflow timing to each cavity C is not uniform, and it is determined that a molding defect has occurred.

As described above, it is possible to make an appropriate quality determination by monitoring the balance of the inflow timing based on whether or not the resin filling of each cavity C is achieved within a predetermined elapsed time. In particular, by managing the elapsed time from the start of resin injection, even if the balance is balanced, it is possible to monitor the state where the resin injection is too fast or too slow, and this is also reflected in the control of the injection rate, etc. Can do. That is, this method is suitable when it is desired to strictly control the inflow velocity.
In addition, although it demonstrated by the example of the inflow timing to the multicavity C, monitoring of the inflow timing in each gate G of a multigate metal mold | die is also possible in the same way.

Next, determination by relative time management of the inflow timing will be described with reference to FIGS. 5C and 5D.
In FIGS. 5A and 5B, the elapsed times Ts and Te are set as the absolute elapsed time reference. However, it is relatively difficult to set the elapsed times Ts and Te.
For example, the optimal inflow timing range is delicately determined depending on various conditions such as changes in manufacturing lots, changes over time of the mold 10 and the injection unit 11, mold temperature, material temperature, and temperature in the room where the injection molding apparatus 2 is disposed. fluctuate. That is, the elapsed times Ts and Te need to be adjusted according to each condition. If the elapsed times Ts and Te are not set appropriately, there may be a situation in which it is determined that the molded product is defective even though the molded product is non-defective.
Of course, more accurate determination is possible by adjusting the settings of the elapsed times Ts and Te. However, in some cases, the elapsed time is not strictly controlled and the inflow timing to each cavity C is aligned. Sometimes it is good.
Therefore, relative time management of the inflow timing can be performed with reference to FIGS. 5C and 5D.

Also in this case, the threshold thDH is set to detect the rising timing. In addition, an allowable rise timing deviation width ΔTH is set for determination of relative balance. The threshold value thDH and the allowable deviation width ΔTH are input by the operator on the computer device 4 through an operation using the management screen 90 as shown in FIG. 3, and the calculation unit 20 receives and acquires them as processing set values. .
5C and 5D show the waveforms of the detection signals of the sensors provided in the cavities C as in FIGS. 5A and 5B.

When the molded product is a non-defective product, the inflow timing into each cavity C is substantially the same, so whether or not the rising timing for each cavity C is relatively aligned is monitored.
FIG. 5C shows an example in which a molded product is determined to be a non-defective product.
In each detection signal waveform, the timing at which the detection value Ddet is equal to or greater than the threshold thDH is relatively concentrated, and the rising timing deviation width ΔTdH from the waveform having the fastest rising timing to the slowest waveform is the allowable deviation width ΔTH. Narrower. In this case, it is evaluated that the inflow timing into each cavity C is substantially the same, and the molded product is determined to be a non-defective product.
On the other hand, FIG. 5D shows a state in which the rising timing of each detection signal waveform is relatively large. As a result, the rising timing deviation width ΔTdH from the waveform having the fastest rising timing to the slowest waveform is wider than the allowable deviation width ΔTH. In this case, the inflow timing to each cavity C is not uniform, and it is determined that a molding defect has occurred.

As described above, by monitoring the balance of the inflow timing based on whether or not the resin filling in the cavities C is relatively aligned, it is possible to make an appropriate quality determination with a simple method.
This example is also applicable to monitoring the inflow timing at each gate G of the multi-gate mold.

As the determination by monitoring the rising timing, the determination method in FIGS. 5A and 5B is referred to as “elapsed time determination”, and the determination method in FIGS. 5C and 5D is referred to as “relative determination”.
In both cases of elapsed time determination and relative determination, the measuring apparatus 1 can perform these determinations in real time while logging the detection value Ddet during execution of one molding cycle, or at the time when one cycle is completed or further Log data can also be acquired at the time of the above.
That is, during the execution of one molding cycle, the detection values Ddet 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, elapsed time determination and relative determination can be performed at various timings.

Next, an example in which the falling timing is monitored will be described with reference to FIGS. 6A and 6B. For example, FIG. 6A shows a waveform P1, P2, P3 of three waveforms among detection signal waveforms (for example, waveforms of a pressure sensor and a temperature sensor) at a plurality of molding cycles in a cavity C of a certain mold 10. As shown.
In the case of a pressure sensor, after reaching a peak value in the molding cycle, the pressure decreases due to material shrinkage over time.
Also in the case of the temperature sensor, after the peak value is reached in the molding cycle, the cooling of the material over time is observed.
Whether the contraction process or the cooling process draws the same profile every time is used for quality determination. For this reason, a certain threshold thDL is set, and the timing when the detection value Ddet becomes equal to or less than the threshold thDL is set as the falling timing, and whether or not the falling timing is within an appropriate elapsed time range from the injection start time T0. Monitor.
The elapsed times Ts1 and Te1 are the shortest and longest values that can be accepted as the elapsed time from the injection start time T0 to the falling timing.
Also in this case, the threshold value thDL and the elapsed times Ts1 and Te1 are input by the operator on the computer device 4 by an operation using the management screen 90 as shown in FIG. Receive and get as value.

In the example of FIG. 6A, the falling timing of the waveform P2 is observed within an appropriate elapsed time range set by the elapsed times Ts1 and Te1. On the other hand, in the waveforms P1 and P3, the falling timing is a timing deviating from the allowable elapsed time range.
In this case, the molded product when the waveform P2 is observed is determined as a non-defective product, and the molded product when the waveforms P1 and P3 are observed is determined as defective.
Such a determination can be used to determine pass / fail for each molding cycle when a single cavity mold 10 is used. Of course, it can also be used for pass / fail judgment for each of the cavities C of the multi-cavity mold 10.

FIG. 6B is an example of monitoring the balance of the falling timing in the multi-cavity type or multi-gate type mold 10.
That is, for example, the quality of a molded product can be determined by monitoring the balance between resin shrinkage and temperature drop in each cavity C.

For example, similarly to FIG. 5A and the like, the waveform of the detection signal for each cavity C is shown.
Whether or not each detection signal waveform falls, that is, whether or not the detection value Ddet is equal to or less than the threshold thDL can be determined to be good or bad.
For example, the above-described concept of elapsed time determination is applied, and the elapsed times Ts2 and Te2 are set as shown in FIG. 6B as the allowable elapsed time of the fall timing. The quality of the molded product can be determined by whether or not the falling timings of the detection signal waveforms for all the cavities C are within the range of the elapsed times Ts and Te from the injection start time T0.

  Alternatively, the allowable deviation width ΔTL is set by applying the above-described concept of relative determination. Then, as shown in FIG. 6B, a fall timing shift width ΔTdL from the waveform having the fastest fall timing to the slowest waveform is measured. The quality of the molded product can be determined based on whether or not the deviation width ΔTdL is narrower than the set allowable deviation width ΔTL.

Although various determination processing examples have been described above, specific processing examples of the arithmetic unit 20 (the data log processing unit 20a and the determination processing unit 20b) that execute these processes will be described below.
The following processing is an example in which various determinations are made in real time during execution of one cycle of resin molding, for example. A case where it is performed immediately after completion of one cycle or at a later time will be described later.
In the following processing example, the calculation unit 20 of the measuring device 1 selects the elapsed time determination in FIGS. 5A and 5B, the relative determination in FIGS. 5C and 5D, and the fall timing determination in FIG. An example of executing it accordingly.

Examples of processing of the arithmetic unit 20 are shown in FIGS. 7, 8, 9, and 10. FIG.
First, the calculation unit 20 performs mode setting in step S101 of FIG. This is a process of recognizing the determination process mode selected by the operator and setting it as a process to be executed. In this example, any one of the elapsed time determination mode, the relative determination mode, and the falling timing determination mode is selected.

In step S102, the calculation unit 20 acquires a set value corresponding to the mode to be executed.
In the elapsed time determination mode, the threshold value thDH and the elapsed time Ts and Te are acquired as set values (see FIGS. 5A and 5B).
In the relative determination mode, each value of the threshold thDH and the allowable deviation width ΔTH is acquired as a set value (see FIGS. 5C and 5D).
In the fall timing determination mode, each value of the threshold thDL and the elapsed times Ts1, Te1 is acquired as a set value (see FIG. 6A).
In steps S <b> 101 and S <b> 102 described above, the calculation unit 20 recognizes and acquires the selected mode and setting value through communication with the computer apparatus 4.

When the preparation for the determination process is completed in steps S101 and S102, the calculation unit 20 waits for the start timing in step S103. For example, the molding timing signal STM from the molding control unit 12 is monitored to detect the start of one cycle of the injection molding operation.
When the start timing (that is, time T0) of one cycle of the injection molding operation is recognized by the molding timing signal STM, the arithmetic unit 20 proceeds to step S104 and starts the logging process by the data log processing unit 20a. That is, storage of the detection value Ddet obtained at each sample timing for each channel is started.
This logging process is continued until the end timing is detected in step S105. In step S105, the arithmetic unit 20 monitors, for example, the end timing of one cycle based on the molding timing signal STM. Note that the end timing may be managed by the calculation unit 20 using an internal count as the time when a predetermined time has elapsed from the start timing.
When detecting the end timing, the arithmetic unit 20 proceeds from step S105 to S106, and ends the logging process.

When the logging process is finished at the end timing, the arithmetic unit 20 confirms whether or not the monitoring is finished in step S107. If the monitoring is continued, the operation unit 20 waits for the start timing in step S103. Even during standby of the start timing, the calculation unit 20 confirms whether the monitoring is finished or continued in step S107.
The arithmetic unit 20 detects an instruction to end monitoring by an operation of the operator using the computer device 4, an end of a specified number of monitoring operations, or an end of injection molding by communication from the injection molding device 2. In step S107, it is determined that the monitoring is finished. In that case, the arithmetic unit 20 ends the process of FIG.
As can be understood from the above description, the logging process is performed for each cycle of injection molding. Therefore, detection signals of various sensors are stored as log data for each cycle. By using this log data, it is possible to evaluate the operation of the injection molding apparatus 2 and verify the molded product.

In parallel with performing logging for each molding cycle as described above, the arithmetic unit 20 performs determination processing for the selected mode.
That is, during the period from when the start timing is recognized in step S103 until the end timing is determined in step S105, the processing of the calculation unit 20 is branched in steps S120, S140, and S160 according to the selected mode. .

  When the processing of the calculation unit 20 is set to the elapsed time determination mode, the processing loops in the order of step S105 → S120 → processing in FIG. 8 → step S105. That is, determination processing as the elapsed time determination mode is performed in steps S121 to S130 of FIG.

In step S121 of FIG. 8, the arithmetic unit 20 acquires a detection value Ddet of a certain input channel I (x) and a time value Tdet as a sample timing. The time value Tdet is, for example, an elapsed time starting from the start timing of one cycle (= resin injection start time T0). The input channel I (x) indicates any of the input channels I1 to I8 (x = 1 to 8).
For example, the arithmetic unit 20 sequentially acquires the detection values of each channel at each time point sequentially transferred via the buffer and IF unit 23 in step S121, and executes the processing of FIG. 8 for each of the acquired detection values. To do. In other words, every time the detection value Ddet to be logged is acquired, the process of FIG. 8 is performed using the detection value Ddet and the time value Tdet.

In step S122, the arithmetic unit 20 is a channel in which the input channel I (x) of the acquired detection value Ddet is the input channel of the detection signal to be monitored for the rising timing, and the rising timing has already been detected in the current cycle. It is determined whether or not there is. That is, it is a determination as to whether or not the channel has already had the detection value Ddet equal to or greater than the threshold thDH at the time before one sample.
If it is a channel whose rise timing has already been detected, the processing in FIG. 8 is terminated, and the process returns to step S105 in FIG.

If the input channel I (x) is a channel whose rise timing is not detected, the calculation unit 20 proceeds from step S122 to S123, and determines whether or not this time is the rise timing. That is, the detection value Ddet is compared with the threshold thDH to confirm whether Ddet ≧ thDH.
If Ddet ≧ thDH, the processing in FIG.
If Ddet ≧ thDH, the current time value Tdet is the rising timing. Accordingly, the arithmetic unit 20 proceeds to step S124, and stores the time value Tdet as a value of the rising timing of the input channel I (x), for example, in a predetermined area of the memory unit 24. For example, it is stored as one of log data.

Subsequently, the calculation unit 20 compares the time value Tdet with the elapsed times Ts and Te in steps S125 and S126.
That is, in step S125, it is determined whether Tdet ≧ Ts.
In step S126, it is determined whether Tdet ≦ Te.
If an affirmative result is obtained in both steps S125 and S126, the rising timing detected this time is within an appropriate elapsed time range, so in step S127, the OK determination result for the detection signal of input channel I (x) is stored in the memory unit. Store in 24 predetermined areas.

  On the other hand, if a negative result is obtained in either step S125 or S126, the detected rising timing is not within the appropriate elapsed time range, and therefore the input channel I (x) is detected in step S128. The error determination result for the signal is stored in a predetermined area of the memory unit 24.

  In step S129, the arithmetic unit 20 confirms whether or not the rising timing has been detected for all the channels that are the rising timing monitoring targets. If there is an input channel whose rise timing has not yet been detected, the processing of FIG.

8 is performed every time the detection value Ddet is acquired, the rising timing has been detected for all the channels in step S129 at a certain point in time. In that case, the arithmetic unit 20 proceeds to step S130 and outputs a determination result.
That is, if OK determination results are stored for all channels, a determination OK notification signal SI is transmitted to the molding control unit 12 and the computer apparatus 4 is notified of the determination OK.
On the other hand, if an error determination result is stored in one channel, a determination error, that is, a failure determination notification signal SI is transmitted to the molding control unit 12 as an alarm, and the computer device 4 is notified of the failure determination.

8 is performed every acquisition of each detection value Ddet, the rising timing of each input channel is detected, and the elapsed time is determined.
The notification of the determination error may be performed immediately when the error is determined in step S128.

  When the process of the arithmetic unit 20 is set to the relative determination mode, the process loops in the order of step S105 → S120 → S140 → process in FIG. 9 → step S105 in FIG. That is, determination processing as the relative determination mode is performed in steps S141 to S151 in FIG.

In step S141 in FIG. 9, the calculation unit 20 acquires a detection value Ddet of a certain input channel I (x) and a time value Tdet as a sample timing.
In step S142, the arithmetic unit 20 is a channel in which the input channel I (x) of the acquired detection value Ddet is the input channel of the detection signal to be monitored for the rising timing, and the rising timing has already been detected in this cycle. It is determined whether or not there is. If it is a channel whose rise timing has already been detected, the processing in FIG. 9 is terminated and the processing returns to step S105 in FIG.
If the input channel I (x) is a channel whose rise timing is not detected, the calculation unit 20 proceeds to step S143, and determines whether or not this time is the rise timing (Ddet ≧ thDH). If Ddet ≧ thDH, the processing of FIG. 9 is terminated.
If Ddet ≧ thDH, since the current time value Tdet is the rising timing, the calculation unit 20 proceeds to step S144 and stores the time value Tdet as the value of the rising timing of the input channel I (x).
The above steps S141 to S144 are the same as steps S121 to S124 in FIG.

  In step S145, the arithmetic unit 20 confirms whether or not the rising timing has been detected for all the channels that are the rising timing monitoring targets. If there is an input channel whose rise timing has not yet been detected, the processing of FIG.

If it is determined in step S145 at a certain point in time that the rising timing has been detected for all channels that are to be monitored for rising timing, the arithmetic unit 20 proceeds to step S146, and sets the maximum value and the minimum value among the rising timings of each channel. judge.
Assume that the channels to be monitored for rising timing are the input channels I1 to I (m), and the rising timing (time value) detected for each channel is Tdet (1) to Tdet (m). The arithmetic unit 20 sets the maximum value as TdetMAX and the minimum value as TdetMIN among the time values Tdet (1) to Tdet (m) as the rising timing.
In step S147, the arithmetic unit 20 sets the rising timing deviation width ΔTdH to ΔTdH = TdetMAX−TdetMIN.
Asking.

When calculating the deviation width ΔTdH, the arithmetic unit 20 compares it with the allowable deviation width ΔTH in step S148.
If ΔTdH ≦ ΔTH, it is determined that the rising timing deviation width is within the allowable range, and an OK determination is made in step S 149. The determination result is stored in a predetermined area of the memory unit 24.
If ΔTdH ≦ ΔTH is not satisfied, an error determination is made in step S150 because the rise timing deviation is not within the allowable range, and the determination result is stored in a predetermined area of the memory unit 24.
In step S151, the calculation unit 20 transmits a determination result notification signal SI to the molding control unit 12, and notifies the computer apparatus 4 of the determination result.
That is, if an OK determination result is stored in the process of step S149, a determination OK notification signal SI is transmitted to the molding control unit 12, and the computer apparatus 4 is notified of the determination OK.
On the other hand, if an error determination result is stored in the process of step S150, a determination error, that is, a failure determination notification signal SI is transmitted to the molding control unit 12 as an alarm, and the computer device 4 is notified of the failure determination.
9 is performed every time each detection value Ddet is acquired, the rising timing of each input channel is detected and relative determination is performed.

  When the processing of the arithmetic unit 20 is set to the fall timing determination mode, the processing loops in the order of steps S105 → S120 → S140 → S160 → processing in FIG. 10 → step S105 in FIG. That is, determination processing in the fall timing determination mode is performed in steps S161 to S169 in FIG.

In step S161 in FIG. 10, the arithmetic unit 20 acquires a detection value Ddet of a certain input channel I (x) and a time value Tdet as a sample timing.
In this mode, the number of input channels to be determined may be one or plural.

In step S162, the calculation unit 20 determines that the input channel I (x) of the acquired detection value Ddet is
Of the input channels of the detection signal to be monitored for the fall timing, it is determined whether or not the rise has already been detected and the fall timing is not detected thereafter. If not applicable, the process in FIG. 10 is terminated, and the process returns to step S105 in FIG.

If the input channel I (x) is an input channel for the detection signal to be monitored and the channel does not detect the falling timing, the calculation unit 20 proceeds to step S163 and determines whether or not this time is the falling timing. judge. That is, the detection value Ddet is compared with the threshold thDL, and it is confirmed whether or not Ddet ≦ thDL.
If Ddet ≦ thDL is not satisfied, the processing in FIG. 10 ends.
If Ddet ≦ thDL, the current time value Tdet is the falling timing. Therefore, the arithmetic unit 20 proceeds to step S164, and stores the time value Tdet as a value of the falling timing of the input channel I (x), for example, in a predetermined area of the memory unit 24.

Subsequently, the calculation unit 20 compares the time value Tdet with the elapsed times Ts1 and Te1 in steps S165 and S166.
That is, it is determined in step S165 whether Tdet ≧ Ts1.
In step S166, it is determined whether Tdet ≦ Te1.
If an affirmative result is obtained in both steps S165 and S166, the falling timing detected this time is within an appropriate elapsed time range, so in step S167 the OK determination result is stored in memory for the detection signal of input channel I (x). The data is stored in a predetermined area of the unit 24.

  On the other hand, if a negative result is obtained in any of steps S165 and S166, the falling timing detected this time is not within the appropriate elapsed time range, so in step S168, the input channel I (x) The error determination result for the detection signal is stored in a predetermined area of the memory unit 24.

In step S169, the calculation unit 20 transmits a determination result notification signal SI to the molding control unit 12, and notifies the computer apparatus 4 of the determination result.
That is, if an OK determination result is stored in the process of step S167, a determination OK notification signal SI is transmitted to the molding control unit 12, and the computer apparatus 4 is notified of the determination OK.
On the other hand, if an error determination result is stored in the process of step S168, a determination error, that is, a failure determination notification signal SI is transmitted to the molding control unit 12 as an alarm, and the computer device 4 is notified of the failure determination.
10 is performed every acquisition of each detection value Ddet, the falling timing of one or more target input channels is detected, and the quality is determined.

As described above, FIGS. 7, 8, 9, and 10 show an example of the processing of the calculation unit 20. FIG. In this example, the elapsed time determination, the relative determination, and the falling timing determination are performed in real time during execution of one cycle of resin molding, but the present invention is not limited thereto.
When it is performed immediately after the completion of one cycle or at a later time, log data of the detection value Ddet and the time value Tdet for the input channel to be monitored is sequentially acquired from the memory unit 24 while FIG. Ten processes may be performed.

Further, although the process of determining the substantially coincidence of the falling timings of the respective detection information waveforms as described with reference to FIG. 6B is not shown, the threshold thDL is used as a necessary part of the process of FIG. 8 as shown in FIG. Needless to say, it is possible to change to the determination using the fall timing detection and the elapsed times Ts2, Te2.

<Timing detection signal output processing>
By the way, the measuring device 1 can notify the forming control unit 12 of the rising timing and the falling timing as the notification signal SI. A processing example for this is shown in FIG.
In FIG. 11, steps S101 to S107 are the same as those in FIG. However, in the mode setting in step S101, the timing notification mode is selected.
In step S102, a threshold thDH and a threshold thDL are acquired.

In the processing example of FIG. 11, monitoring of steps S180 and S190 is performed in a period from the start to the end of one cycle of molding.
In step S180, it is determined whether or not the detection value Ddet is equal to or greater than a threshold thDH. When the detection value Ddet is equal to or greater than the threshold thDH, that is, when the rising timing is detected, the calculation unit 20 proceeds to step S181 and outputs a notification signal SI as a rising timing detection signal. Further, the time value Tdet is stored as the rise timing detected in step S182.

FIG. 12A shows the rising timing notification signal SI.
As described above, considering the detection signal of the pressure sensor, for example, the rising timing is the timing immediately after the cavity is filled with the resin material.
For example, the molding control unit 12 controls the speed of the injected resin until the resin fills the cavity, and performs control to switch to pressure control after the filling. For that purpose, it is necessary to detect the full timing, but this timing can be known from this notification signal SI. Therefore, the molding control unit 12 can perform switching from speed control to pressure control at an appropriate timing.

In step S190 of FIG. 11, it is determined whether or not the detection value Ddet has become equal to or less than the threshold thDL after the rise has already been observed.
When the detection value Ddet is equal to or less than the threshold thDL, that is, when the falling timing is detected, the arithmetic unit 20 proceeds to step S191 and outputs the notification signal SI as the falling timing detection signal. Further, the time value Tdet is stored as the fall timing detected in step S192.

FIG. 12B shows the notification signal SI of the falling timing.
The fall timing represents a temperature drop or shrinkage of the molding material. The removal of the molded product from the mold 10 is performed when the temperature and pressure are lowered to some extent. Then, the falling timing detected using a certain threshold thDL may be a timing suitable for the removal of the molded product. it can.
Therefore, for example, the molding control unit 12 controls the opening / closing mechanism of the mold 10 according to the notification signal SI of the falling timing, and opens the mold 10 to take out the molded product.
In this way, the molded product can be taken out at an optimal timing.
That is, it is possible to prevent the take-out from being too fast and causing molding defects, and the take-out from being too slow to cause a long process cycle.
Therefore, it is possible to improve yield and improve manufacturing efficiency by reducing one cycle time of the process.

In the processing example of FIG. 11, both the rise timing notification and the fall timing notification are performed, but either may be selectively executed by mode selection.
In addition to the determination processing described with reference to FIG. 7, or alternatively, processing of rising timing notification or falling timing notification may be performed.

<Summary and modification>
Measuring device 1 of the above embodiment has a plurality of input channels I1-In, and inputs simultaneously a detection signal of a plurality of sensors arranged in injection molding device 2 which has injection part 11 and metallic mold 10. The input unit 21 can be used. In addition, the data log processing unit 20a that stores the detection value Ddet at each time point Tdet input to each input channel as log data, and a specific timing is detected for the detection signal of one or a plurality of input channels. And a determination processing unit 20b that obtains the determination result of the injection molding situation by processing using the above.
That is, the measuring apparatus 1 functions as a data logger for detection signal values of various sensors (31, 32) provided in the injection molding apparatus 2 (mold 10 and injection unit 11), for example, a pressure sensor and a temperature sensor. In addition, it is possible to determine events in various molding processes and to determine whether a molded product is non-defective or defective. In particular, it is possible to input detection signals for a plurality of channels, and to perform determination using not only the specific timing of the detection signal for one channel but also the specific timing of the detection signal for each of the plurality of channels.
For example, in the injection molding apparatus 2 using the multi-cavity mold 10 and the multi-gate mold 10, the temperature, pressure, and other various conditions in each cavity / gate, especially the deviation in specific timing of these detection signals, are molded. Affects product quality. Further, the variation in the temperature and pressure drop profile in the mold 10 depends on the quality of the molded product. Therefore, by comparing them with each other or by comparing whether or not they are within a predetermined time axis range, it is possible to efficiently and accurately determine the quality of the molded product.
Especially in the injection molding of thermoplastic resin, multi-cavity molds are suitable for improving mass production efficiency, and multi-gate type (multi-point gate) molds improve the filling efficiency of resin materials. Suitable for In these cases, there is a case where molding defects occur when the inflow balance in each cavity or each gate is lost. Therefore, the ability to detect and manage these imbalances by evaluating specific timing is very effective for production management by injection molding.

  In addition, the process which detects a specific timing about the detection signal of one or several input channels, and calculates | requires the determination result of an injection molding condition by the process using the detected specific timing may be performed in real time according to an injection molding cycle. Yes, it can be done later using log data. Therefore, it may be used for real-time monitoring in the molding process or for the purpose of ex-post process analysis.

In addition, the measuring device 1 according to the embodiment detects the rising timing (first timing) at which the detection value Ddet is greater than or equal to the threshold thDH for the detection signals of a plurality of input channels as the elapsed time determination, It is determined whether or not the timing is between a predetermined first time point and a second time point (between elapsed times Ts and Te) (see FIG. 8).
For example, considering that detection signals of n parts where resin inflow is simultaneously performed in the injection molding apparatus are input from the first input channel to the nth input channel, the detection signals are essentially substantially simultaneous. A significant change, for example, a rising edge of the detected signal value waveform should be observed. This rising timing is detected as a first timing at which the detection signal is equal to or higher than the first threshold. There are various factors that cause the rise timing to deviate, but the timing deviation is an index for determining the quality of a molded product. If the first timings (rising timings) of the detection signals of the plurality of input channels are all between the first time point (Ts) and the second time point (Te), the rising timings of the input channels are aligned and specified. It is shown that it has risen within the elapsed time range. In other words, the rising edges of the detection signals are relatively uniform and are within a good range in elapsed time. Thereby, the balance of the situation in each cavity and each gate can be monitored, and a comparatively strict evaluation can be performed for each molded product.

In addition, as a relative determination, the measurement apparatus 1 according to the embodiment detects a rising timing (first timing) at which the detection value Ddet is equal to or greater than the threshold thDH for detection signals of a plurality of input channels, and each rising timing of each of the plurality of channels. It is determined whether or not the deviation width ΔTdH is within a predetermined time width (allowable deviation width ΔTH) (see FIG. 9).
For example, if the deviation of the first timing (rise timing) is within a predetermined time width for the detection signals of a plurality of input channels without determining the elapsed time from the start of resin injection, etc., each detection of each input channel Evaluate that the rise of the signal waveform is relatively aligned. Thereby, the balance of the situation in each cavity and each gate can be monitored.
Here, for example, the elapsed time from the start of resin injection may deviate due to various circumstances. Then, since the point of elapsed time is reflected in the determination, it may be determined that the product is defective although it is a non-defective product. Therefore, when the elapsed time does not affect the molded product, the relative coincidence of the rising edges of the detection signals is monitored. As a result, it is possible to make a highly accurate determination suitable for the aging situation and the environment.

The measuring apparatus 1 according to the embodiment detects a falling timing (second timing) when the input detection value Ddet is equal to or less than a threshold thDL, and the falling timing is between a predetermined first time point and a second time point (Ts1). To Te1) (see FIG. 10).
For example, whether the fall timing of the pressure or temperature detection signal is within a predetermined elapsed time range is determined by whether the resin material cooling process, shrinkage process, etc. are detected with an appropriate detection signal profile To do. If the falling timing is within an appropriate elapsed time range, it can be evaluated that the cooling process, the shrinking process, etc. of the resin material of the molded product are in an appropriate state, thereby making it possible to make an appropriate quality determination.
Such fall timing monitoring is effective as a cycle-by-cycle profile monitoring for one channel, and also effective for monitoring the balance of multiple channels for multi-cavity type and multi-gate type molds. .

The measuring apparatus 1 according to the embodiment performs a process of outputting the notification signal SI in response to detecting the rising timing (first timing) or the falling timing (second timing) (FIGS. 11 and 11). 12).
The rise timing and fall timing of detection signals from pressure sensors, temperature sensors, etc. can be used for operation control of the injection molding apparatus 1. Therefore, the molding control unit 12 can execute efficient operation control by outputting the notification signal SI of the rising timing or the falling timing.

Although the embodiments according to the present invention have been described above, the present invention should not be limited to the specific examples described above, and various modifications can be considered.
Various configurations of the injection molding apparatus 2 are conceivable. The configuration of the measuring device 1 is the same.
The processing unit 20 of the measuring apparatus 1 shown in FIGS. 7 to 11 is only an example of processing, and various specific processing examples can be considered.
Various sensors (in-mold sensor 31 and in-injection sensor 32) mounted on the injection molding apparatus 2 can be considered. In other words, the measuring device 1 uses various pressures of detection signals in addition to 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 rate measurement of molding material based on detection signal of optical sensor, flow front measurement based on detection signal of infrared sensor, etc. (for example, measurement of time until molding resin reaches predetermined position in cavity), position sensor, etc. The present invention can also be suitably applied to other measurements related to injection molding, such as measurement of the amount of misalignment between molds when the mold is closed based on the detection signal (measurement of mold opening amount).

<Program and storage medium>
The program according to the embodiment of the present invention is a program that causes the calculation unit 20 (an arithmetic processing device such as a microcomputer) in the measurement apparatus 1 to execute a function as the determination processing unit 20b.

  The program according to the embodiment specifies, for example, the detection signals of one or more sensors (31, 32) arranged in the injection molding apparatus 2 that are input to all or part of the plurality of input channels of the measuring apparatus 1. This is a program for causing an arithmetic processing unit to execute a timing detection step for detecting timing and a determination step for obtaining a determination result of an injection molding situation by processing using the detected specific timing. That is, it is a program for executing the processes of FIGS. 7, 8, 9, and 10.

Such a program facilitates the manufacture of the measuring apparatus 1 of the present embodiment.
Such a program can be stored in advance in a storage medium built in a device such as a computer device or a ROM in a microcomputer having a CPU. Alternatively, it can be stored (stored) temporarily or permanently in a removable storage medium such as a semiconductor memory, memory card, optical disk, magneto-optical disk, or magnetic disk. Such a removable storage medium 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, or can be downloaded from a download site via a network such as a LAN or the Internet.

Moreover, the computer apparatus 4 can also be provided with the function of the measuring device 1 by installing the program of such embodiment in the computer apparatus 4. FIG.
For example, the dedicated amplifier 3 and the computer device 4 are directly connected by a connector. The computer apparatus 4 is supplied with detection signals of a plurality of input channels simultaneously via the dedicated amplifier 3. Then, when the software including the program is started in the computer apparatus 4, the processing of FIGS. 7, 8, 9, and 10 is executed by the computer apparatus 4. That is, a specific timing is detected for detection signals of one or a plurality of sensors (31, 32) input to all or a part of a plurality of input channels, and the injection molding situation is determined by processing using the detected specific timing. Processing to obtain the result is performed. Thereby, the measuring apparatus 1 is realizable using computer apparatuses 4, such as a personal computer.

DESCRIPTION OF SYMBOLS 1 ... Measuring apparatus, 2 ... Injection molding apparatus, 3 ... Dedicated amplifier, 4 ... Computer apparatus, 10 ... Mold, 11 ... Injection | emission part, 12 ... Molding control part, 20 ... Operation part, 20a ... Data log process part, 20b Reference processing unit, 21 input unit, 22 A / D converter, 23 buffer and IF unit, 24 memory unit, 31 in-mold sensor, 32 in injection sensor, 33 sensor amplifier, 100 ... Measurement system

Claims (8)

An input unit having a plurality of input channels and capable of simultaneously inputting detection signals of a plurality of sensors arranged in the injection molding apparatus;
A data log processing unit for storing the detection signal value at each time point input to each input channel of the input unit as log data;
The detection signal of one or more input channels, and detecting a specific timing, e Bei and a determination processing unit for determining the determination result of the injection molding conditions by treatment with the specific timing detected,
The determination processing unit
For detection signals of a plurality of input channels, a first timing at which the detection signal is equal to or higher than a first threshold is detected as the specific timing,
A measurement device that determines whether or not the first timing of each of a plurality of channels is between a predetermined first time point and a second time point . An input unit having a plurality of input channels and capable of simultaneously inputting detection signals of a plurality of sensors arranged in the injection molding apparatus;
  A data log processing unit for storing the detection signal value at each time point input to each input channel of the input unit as log data;
  A detection processing unit that detects a specific timing for a detection signal of one or a plurality of input channels and obtains a determination result of an injection molding situation by processing using the detected specific timing;
The determination processing unit
  For detection signals of a plurality of input channels, a first timing at which the detection signal is equal to or higher than a first threshold is detected as the specific timing,
  It is determined whether or not the shift of the first timing of each of a plurality of channels is within a predetermined time width.
Measuring device. The determination processing unit
As the specific timing, a second timing at which a detection signal input to the input unit is equal to or lower than a second threshold is detected.
The measuring apparatus according to claim 1, wherein it is determined whether or not the second timing is between a predetermined first time point and a second time point. The determination processing unit detects the first timing when the detection signal of the input channel is equal to or higher than the first threshold, or the second timing when the detection signal is equal to or lower than the second threshold. Alternatively, the measurement apparatus according to claim 1, wherein a process for outputting a notification signal at the second timing is performed. A timing detection step of detecting a specific timing with respect to detection signals of one or a plurality of sensors arranged in the injection molding apparatus, which are input to all or a part of a plurality of input channels of the measuring apparatus;
Bei example a determination step by treatment with a specific timing of detection obtains the determination result of the injection molding conditions, a
In the determination step, for the detection signals of a plurality of input channels, a first timing at which the detection signal is equal to or higher than a first threshold is detected as the specific timing, and the first timing of each of the plurality of channels is determined from a predetermined first time point. A measurement method of a measurement device that determines whether or not it is between the second time points . A timing detection step of detecting a specific timing with respect to detection signals of one or more sensors arranged in the injection molding apparatus, which are input to all or a part of the plurality of input channels;
A determination step for obtaining a determination result of an injection molding situation by a process using the detected specific timing ,
In the determination step, for the detection signals of a plurality of input channels, a first timing at which the detection signal is equal to or higher than a first threshold is detected as the specific timing, and the first timing of each of the plurality of channels is determined from a predetermined first time point. A program that causes an arithmetic processing unit to execute a process of determining whether or not it is between second time points . A timing detection step of detecting a specific timing with respect to detection signals of one or a plurality of sensors arranged in the injection molding apparatus, which are input to all or a part of a plurality of input channels of the measuring apparatus;
Bei example a determination step by treatment with a specific timing of detection obtains the determination result of the injection molding conditions, a
In the determination step, for the detection signals of a plurality of input channels, a first timing at which the detection signal is equal to or higher than a first threshold is detected as the specific timing, and a shift in the first timing of each of the plurality of channels is a predetermined time width. A measurement method of a measurement device that determines whether or not the value is within the range . A timing detection step of detecting a specific timing with respect to detection signals of one or more sensors arranged in the injection molding apparatus, which are input to all or a part of the plurality of input channels;
A determination step for obtaining a determination result of an injection molding situation by a process using the detected specific timing ,
In the determination step, for the detection signals of a plurality of input channels, a first timing at which the detection signal is equal to or higher than a first threshold is detected as the specific timing, and a shift in the first timing of each of the plurality of channels is a predetermined time width. A program for causing an arithmetic processing unit to execute a process for determining whether or not the number is within a range.

Images