JP2010076177A - Device for determining good/bad of injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for determining the good/bad of an injection molding machine, capable of setting, when molding data of a monitoring item is out of a good/bad determination range, different determination modes depending on whether it is above an upper limit value or is below a lower limit value. <P>SOLUTION: As physical quantities affecting the molding good/bad of the injection molding machine, die internal pressure 50, initial pressure 60, measuring time 70, mold temperature 80 and V-P position 90 are selected. A determination mode for upper limit value and a determination mode for lower limit value can be individually set for each physical quantity of the monitoring item, for example, as upper limit value 51, determination mode 52, lower limit value 53, and determination mode 54 are set to the die internal pressure 50. In the die internal pressure 50, the good/bad determination 52 and the good/bad determination 54 are set. In the mold temperature 80, the determination mode is set to cycle stop and good/bad determination. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a quality determination device for an injection molding machine, and more particularly to a quality determination device for an injection molding machine in which a determination mode can be set.

  In order to streamline production, it is an important issue from the viewpoint of production efficiency and economy to automatically determine whether a molded product is non-defective or defective and further reduce the defective product generation rate to improve yield.

  There are many factors that affect the molding quality. In an injection molding machine, molding data that affects the product quality for each shot in the molding cycle, for example, mold pressure, initial pressure of injection, injection speed, peak pressure of injection, metering time, mold temperature, injection holding pressure Measure physical quantities such as switching position (VP position), required injection time, mold clamping force, etc., and check if these values are within the tolerances set for each physical quantity. It is a known technique to determine the quality of a product.

  In Patent Document 1, a second pass / fail judgment range is provided in addition to the normal pass / fail judgment range, and a molded product when the second pass / fail judgment range is exceeded is determined as a defective product and is regarded as a serious abnormality. A technique for outputting a signal indicating an abnormality from the information output unit to the control unit of the molding machine and stopping the operation of the molding machine is disclosed.

  Patent Document 2 discloses a technique for outputting an alarm to notify an operator when the measured value is outside the pass / fail judgment range, or outputting a stop of product discharge or a next shot to the process control unit. . In this document, the output of the alarm and the output of the stop of the product discharge or the stop of the next shot can be set according to the quality determination item, and both the alarm output and the stop output can be set in one item Is also disclosed.

JP 60-24915 A JP-A-9-267163

  As an example, a case where the in-mold pressure is used as a monitoring item for molding quality control as molding data which is a measurement value of injection molding will be described. When the mold internal pressure exceeds the upper limit (when the mold internal pressure rises too much), it is overpacked and the molded product may be clogged. Therefore, alarm output and one cycle stop are performed as alarm discrimination. On the other hand, when the mold internal pressure is too low (below the lower limit), it is a short shot and can continue to be molded even though it is a defective product. In some cases, it is desired to continue molding from the viewpoint of efficiency and economy.

  However, as explained in the background art, in the prior art, the quality judgment of a molded product using the quality judgment range is performed by paying attention to whether the molding data is within the quality judgment range, and molding is performed. No distinction is made as to whether the data is above the upper limit or below the lower limit. FIG. 9 can schematically represent a quality determination method in the prior art. As can be seen from FIG. 9, the pass / fail judgment mode is only a mode for discriminating whether or not it is within the pass / fail judgment range as described above.

  Therefore, even when the molding data exceeds the upper limit value of the pass / fail determination range and falls below the lower limit value, the same determination mode is applied as shown in FIG. In other words, it is not possible to select different discrimination modes when the molding data exceeds the upper limit and when the molding data exceeds the lower limit. Therefore, in the case of the mold internal pressure described above, the cycle stop is performed when the upper limit value is exceeded, and different determinations such as output of a defective product signal cannot be made when the lower limit value is exceeded.

  Accordingly, an object of the present invention is to provide a quality determination device for an injection molding machine capable of setting different determination modes when an upper limit value for quality determination is exceeded and when a lower limit value is exceeded.

  The invention according to claim 1 of the present application is a physical quantity measuring means for measuring physical quantities such as pressure, speed, time, etc. that affect the quality of a molded product of an injection molding machine for each molding cycle, and upper and lower limits for pass / fail judgment. The pass / fail judgment range setting means for setting the physical quantity measured by the physical quantity measuring means and the set upper / lower limit value of the pass / fail judgment are compared, and an upper limit discriminating operation signal is output when the measured physical quantity is greater than the upper limit value. A lower limit value that outputs a lower limit value determination operation signal when the measured physical quantity is smaller than the lower limit value by comparing the upper limit value determination operation means to the physical quantity measured by the physical quantity measuring means and the lower limit value of the set pass / fail judgment And a determination mode setting means for individually setting the determination operations of the upper limit value determination operation means and the lower limit value determination operation means. A quality decision device for an injection molding machine according to.

  The invention according to claim 2 is characterized in that the discrimination mode setting means can set at least one discrimination mode of output of a defective product signal and output of an operation stop signal of an injection molding machine. 1. A quality determination device for an injection molding machine according to 1.

  The invention according to claim 3 is characterized in that the discrimination mode setting means can set and set a combination of discrimination modes in advance, and the quality determination device for an injection molding machine according to any one of claims 1 and 2 It is.

  According to the present invention, when the molding data of the monitoring item is out of the pass / fail judgment range, the pass / fail judgment of the injection molding machine that can set different discrimination modes depending on when it exceeds the upper limit value and below the lower limit value An apparatus can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating selection of a discrimination mode in the embodiment of the present invention. In the embodiment of the present invention, when the measured physical quantity exceeds the upper limit value for pass / fail judgment, (A) upper limit pass / fail judgment mode, (B) upper limit alarm judgment mode, and (C) upper limit cycle stop judgment mode 3 When the measured physical quantity falls below the lower limit value for pass / fail judgment, (D) the lower limit value pass / fail judgment mode, (E) the lower limit alarm judgment mode, (F ) It is possible to select from the three determination modes of the lower limit value cycle stop determination mode.

Here, the discrimination modes (A) to (F) will be described.
(A) Upper limit value pass / fail discrimination mode: This discrimination mode is a mode for outputting a signal indicating that the product is defective when the physical quantity obtained by measurement exceeds the upper limit for pass / fail discrimination.
● (B) Upper limit alarm discrimination mode: This discrimination mode is a mode that outputs an alarm signal when the physical quantity obtained by measurement exceeds the upper limit for pass / fail judgment, and does not command the stop of the injection molding machine. Mode.
(C) Upper limit cycle stop discrimination mode: This discrimination mode is a mode that outputs an alarm signal and an injection molding machine stop signal when the measured physical quantity exceeds the upper limit for pass / fail judgment. It is.
(D) Lower limit value pass / fail judgment mode: This discrimination mode is a mode for outputting a signal indicating that the product is defective when the physical quantity obtained by measurement falls below the lower limit for pass / fail judgment.
● (E) Lower limit alarm judgment mode: This judgment mode is a mode that outputs an alarm signal when the measured physical quantity falls below the lower limit of pass / fail judgment, and does not command the injection molding machine to stop. Mode.
● (F) Lower limit cycle stop discrimination mode: This discrimination mode outputs an alarm signal and an injection molding machine stop signal when the measured physical quantity falls below the lower limit for pass / fail discrimination. It is.

  FIG. 2 is a schematic configuration diagram of an injection molding machine including the quality determination apparatus according to the embodiment of the present invention. Reference numeral 1 denotes an injection cylinder of the injection molding machine, and reference numeral 2 denotes a screw. The screw 2 is driven in the injection axis direction by the injection servo motor M1 through the drive converter 5 for converting the shaft rotation of the drive source into the linear motion in the injection axis direction, and the screw 2 is driven through the gear mechanism 3. The metering rotation is performed by the rotation servo motor M2. A pressure detector 4 is provided at the base of the screw 2 to detect the resin pressure acting in the axial direction of the screw 2, that is, the injection holding pressure in the injection holding process and the screw back pressure in the measuring process. Reference numeral 6 denotes a hopper which is a charging port for supplying a resin material to the injection cylinder 1.

  The injection servo motor M1 is provided with a position / speed detector P1 for detecting the position and movement speed of the screw 2, and the screw rotation servo motor M2 detects the rotation position and rotation speed of the screw 2. A position / speed detector P2 is provided.

  The control device 10 of the injection molding machine includes a CNC CPU 25 which is a numerical control microprocessor, a PMC CPU 18 which is a programmable machine controller microprocessor, a servo CPU 20 which is a servo control microprocessor, and injection holding pressure and screw back pressure. A pressure monitor CPU 17 that performs sampling processing is provided, and information transmission between the microprocessors can be performed by selecting mutual input / output via the bus 22.

  Connected to the PMC CPU 18 are a ROM 13 storing a sequence program for controlling the sequence operation of the injection molding machine, a control program for determining the quality of products, and a RAM 14 used for temporary storage of calculation data. The ROM 13 further stores display data (see FIGS. 3 and 4) related to the setting screen related to the present invention.

Connected to the CNC CPU 25 are a ROM 28 storing a program for overall control of the injection molding machine and a RAM 27 used for temporary storage of calculation data. Connected to the servo CPU 20 are a ROM 21 storing a control program dedicated to servo control and a RAM 19 used for temporary storage of data.
The pressure monitor CPU 17 is connected to a ROM 11 that stores a control program related to a molding data sampling process and the like, and a RAM 12 that is used for temporary storage of data.

  The servo CPU 20 is connected to a servo amplifier 15 for driving a servo motor for each axis such as mold clamping, ejector (not shown), injection, screw rotation, etc. based on a command from the servo CPU 20. The position / speed detector P1 provided in the servo motor M1 and the output from the position / speed detector P2 provided in the screw rotation servomotor M2 are fed back to the servo CPU 20 and the current position storage register prepared in the RAM 19 is provided. And the current speed storage register.

  The molding data storage RAM 24 is a non-volatile memory for molding data storage that stores molding conditions (injection holding pressure conditions, weighing conditions, etc.) related to injection molding operations, various set values, parameters, macro variables, and the like in the conventional manner. Memory. The interface 23 is an input / output interface for receiving signals from limit switches and operation panels arranged in each part of the injection molding machine and transmitting various commands to peripheral devices of the injection molding machine.

  The CNC CPU 25 outputs a movement command to the servo CPU 20 of each axis based on the control program in the ROM 28, and the servo CPU 20 executes servo control based on feedback signals from the position detector and speed detector.

  A manual data input device 29 with a display device is connected to the bus 22 via the LCD display circuit 26, and is used for monitoring various items such as display of setting screens and data input operations, for example, as monitoring items for molding operations shown in FIGS. With the related setting screen displayed, you can select the monitoring items to be monitored with the molding data, input the upper / lower limit values for pass / fail judgment, input operations such as setting the discrimination mode, etc. This is performed by a numeric keypad touch panel or the like.

Next, an example of a display screen displayed on the display device of the quality determination device for an injection molding machine according to the embodiment of the present invention shown in FIG. 2 will be described with reference to FIGS. 3 and 4.
FIG. 3 shows a first example of the display screen, in which a discrimination mode is set for each of the upper limit value and the lower limit value. The setting of the discrimination mode and the input of the upper limit value and the lower limit value can be performed by the method described for the manual data input device with display 29 described above.

FIG. 3 shows that the in-mold pressure, the initial injection pressure, the metering time, the mold temperature, and the VP position are set as the monitoring items for injection molding. For example, the upper limit value, the determination mode, the lower limit value, and the determination mode 4 for the physical quantities of the respective monitoring items, such as the upper limit value 51, the determination mode 52, the lower limit value 53, and the determination mode 54 for the mold internal pressure 50. Set one. The determination mode must be set in two modes: a determination mode 52 for the upper limit value and a determination mode 54 for the lower limit value. In FIG. 3, the determination mode 52 is set to pass / fail determination mode, and the determination mode 54 is set to cycle stop mode.
Also, the determination mode can be set individually for the physical quantities of the monitoring items other than the mold internal pressure 50, and two mode setting operations are required for each.

  FIG. 4 is a second example of the display screen, and is an example in which the determination mode of the upper limit value and the lower limit value for the physical quantity of one monitoring item is set by one setting. In FIG. 4, the discrimination mode is set in one setting operation of the discrimination mode 55 in which the discrimination mode for the upper limit value and the discrimination mode for the lower limit value are set. Compared with the setting method shown in FIG. 3, the setting method shown in FIG. 4 saves the trouble of setting the discrimination mode and can reduce setting mistakes.

In FIG. 4, “good / bad determination mode”, “cycle stop upper limit value”, “cycle stop lower limit value”, and “cycle stop upper limit lower limit value” are prepared.
The “good / bad determination mode” is a patterned determination mode in which the upper limit determination mode is the pass / fail determination mode and the lower limit determination mode is the pass / fail determination mode.
The “cycle stop upper limit mode” is a patterned determination mode in which the upper limit determination mode is a cycle stop mode and the lower limit determination mode is a pass / fail determination mode.
The “cycle stop lower limit mode” is a patterned determination mode in which the upper limit determination mode is a pass / fail determination mode and the lower limit determination mode is a cycle stop mode.
The “cycle stop upper limit lower limit mode” is a patterned determination mode in which the upper limit determination mode is a cycle stop mode and the lower limit determination mode is a cycle stop mode.

Next, with reference to FIG. 5, FIG. 6, and FIG. 7, the algorithm of the discrimination mode setting and discrimination operation processing in the embodiment of the present invention shown in FIG. 2 will be described.
First, the setting of the discrimination mode for setting the discrimination operation in the present invention will be described. FIG. 5 is a flowchart showing an algorithm for setting the discrimination mode in the present invention. This setting method is a method of setting the discrimination mode for the upper limit value and the lower limit value for each physical quantity. The flowchart of FIG. 5 will be described according to each step with reference to the display screen 29a shown in FIG.

[Step SA1] A physical quantity to be set is selected.
[Step SA2] The setting of the upper limit value discrimination mode is read. More specifically, for example, the setting input by the manual data input device 29 with a display device is read. For example, taking in-mold pressure 50, which is a physical quantity of the monitoring item in FIG. 3, for example, the upper limit determination mode is a pass / fail determination mode, and the lower limit determination mode is also a pass / fail determination mode. As described above, it is necessary to perform the setting operation of the upper limit value and the lower limit value twice for physical use of one monitoring item. If the display screen is a touch panel, the input operation can be performed by displaying the discrimination mode cyclically and selecting the set discrimination mode by touching the screen. Also, the numerical values of the upper limit value and the lower limit value may be input together with the determination mode setting, or may be read by reading preset data.
[Step SA3] The determination mode setting read in Step SA2 is stored in the memory.
[Step SA4], [Step SA5] The setting of the lower limit value discrimination mode is read and stored in the memory. The contents of the processing are the same as in steps SA2 and SA3.
[Step SA6] It is determined whether or not the discrimination mode has been set for the physical quantity of the monitored item. If not, the process returns to Step SA1 to perform the discrimination mode setting process for the next physical quantity and is set. If is finished, the determination mode setting process is terminated.

As shown in FIG. 1, the determination modes set in step SA2 and step SA4 include (A) an upper limit value pass / fail determination mode, (B) an upper limit alarm determination mode, (C) an upper limit cycle stop determination mode, ( It is a mode selected and input from D) a lower limit value pass / fail judgment mode, (E) a lower limit alarm judgment mode, (F) a lower limit cycle stop judgment mode, and a judgment mode OFF.
In the flowchart of FIG. 5, the setting of the upper limit value determination mode is read and stored first, but the setting of the lower limit value determination mode may be read and stored first.

  FIG. 6 is a flowchart showing an algorithm for patterning and setting the discrimination mode in the present invention. This setting form is setting means for efficiently performing the discrimination mode setting work. The flowchart of FIG. 6 will be described according to each step with reference to the display screen 29b shown in FIG.

[Step SB1] A physical quantity to be set is selected.
[Step SB2] Read the discrimination mode setting.
[Step SB3] Recall the setting of the patterned discrimination mode corresponding to the read discrimination mode. The patterned discrimination mode is stored in advance in a memory. In FIG. 4 and FIG. 6, “good / bad determination mode”, “cycle stop upper limit value”, “cycle stop lower limit value”, and “cycle stop upper limit lower limit value” are prepared as patterned determination modes. As described above, the meaning of each is the “good / bad determination mode”, which is a patterned determination mode in which the upper limit determination mode is the pass / fail determination mode and the lower limit determination mode is the pass / fail determination mode. The “cycle stop upper limit mode” is a patterned determination mode in which the upper limit determination mode is a cycle stop mode and the lower limit determination mode is a pass / fail determination mode. The “cycle stop lower limit mode” is a patterned determination mode in which the upper limit determination mode is a pass / fail determination mode and the lower limit determination mode is a cycle stop mode. The “cycle stop upper limit lower limit mode” is a patterned determination mode in which the upper limit determination mode is a cycle stop mode and the lower limit determination mode is a cycle stop mode.

Next, the discrimination operation in the present invention will be described. FIG. 7 is a flowchart showing an algorithm of three discrimination modes in the embodiment of the present invention. FIG. 8 is a flowchart showing an algorithm of two discrimination modes in the embodiment of the present invention.
[Step SB4] When the patterned discrimination mode called in step SB3 is the pass / fail discrimination mode, the process proceeds to step SB10, the upper limit discriminating mode is stored in the memory as the pass / fail discrimination mode, and the lower limit discriminating mode is set. The pass / fail judgment mode is stored in the memory, and the process proceeds to step SB9. If it is not the pass / fail judgment mode, the process proceeds to step SB5.
[Step SB5] If the patterned discrimination mode called in Step SB3 is the cycle stop upper limit value mode, the process proceeds to Step SB11, the upper limit discriminating mode is stored in the memory as the cycle stop mode, and the lower limit value discrimination is performed. The mode is stored in the memory as a pass / fail judgment mode, and the process proceeds to step SB9. If it is not the cycle stop upper limit value mode, the process proceeds to step SB6.
[Step SB6] If the patterned discrimination mode called in Step SB3 is the cycle stop lower limit mode, the process proceeds to Step SB12, the upper limit discriminating mode is stored in the memory as the pass / fail discrimination mode, and the lower limit discriminating is performed. The mode is stored in the memory as the cycle stop mode, and the process proceeds to step SB9. If it is not in the cycle stop lower limit mode, the process proceeds to step SB7.
[Step SB7] If the patterned determination mode called in Step SB3 is the cycle stop upper limit lower limit value mode, the process proceeds to Step SB13, where the upper limit determination mode is stored in the memory as the cycle stop mode, and the lower limit is set. The value determination mode is stored in the memory as the cycle stop mode, and the process proceeds to step SB9. If it is not in the cycle stop upper limit lower limit mode, the process proceeds to step SB8.
[Step SB8] If the determination mode read in step SB2 is OFF (off), the process proceeds to step SB14, and the determination mode is stored in the memory as OFF (off).
[Step SB9] It is determined whether or not the discrimination mode setting is completed for the physical quantity of the monitoring item. If is finished, the determination mode setting process is terminated.

  In the flowchart shown in FIG. 6, the determination is made in the order of the pass / fail determination mode, the cycle stop upper limit value, the cycle stop lower limit value, the cycle stop upper limit lower limit value, or the determination mode OFF. Since there is no meaning, it may be a flowchart in which the order is changed.

  Next, the discrimination processing algorithm in the embodiment of the present invention will be described with reference to FIG. In the embodiment shown in FIG. 7, the output of the discrimination operation of the upper limit value pass / fail judgment mode, the lower limit value pass / fail judgment mode, the upper limit alarm judgment mode, the lower limit alarm judgment mode, the upper limit cycle stop mode, and the lower limit cycle stop mode is output. Eggplant. Hereinafter, it demonstrates according to each step. Note that the execution timing of the determination process is the same as that of the conventional quality determination apparatus, and is set so that the determination process is completed at least when the mold opening operation of one molding cycle ends.

[Step SC1] A measurement value that is a physical quantity is acquired. The measured value of the physical quantity is obtained every predetermined sampling period in one molding cycle. Alternatively, for example, it is stored in a memory of a control device of an injection molding machine such as the RAM 12 and the RAM 14 shown in FIG.
[Step SC2] It is determined whether or not the determination mode is OFF. If the determination mode is OFF, the process proceeds to step SC5. If the determination mode is not OFF, the process proceeds to step SC3.
[Step SC3] It is determined whether or not the measured value exceeds the upper limit value. If it exceeds, the process proceeds to Step SC6, and if not, the process proceeds to Step SC4.
[Step SC4] It is determined whether or not the measured value is below the lower limit value. If it is below, the process proceeds to Step SC12, and if not, the process proceeds to Step SC5.
[Step SC5] The measured value, which is the physical quantity acquired in Step SC1, is displayed.

[Step SC6] Since the process has shifted from step SC3, the upper limit value determination mode that has been set and stored is read from the memory, and the process proceeds to step SC7. Note that the setting of the discrimination mode read from the memory is stored in advance by the processing shown in FIGS.
[Step SC7] If the determination mode read in step SC6 is the upper limit value pass / fail determination mode, the process proceeds to step SC8. When it is not the upper limit value pass / fail judgment mode, the routine proceeds to step SC9.
[Step SC8] An upper limit value defective product signal is output, and the process proceeds to Step SC5.
[Step SC9] If the determination mode read in step SC6 is the upper limit alarm determination mode, the process proceeds to step SC10. If it is not the upper limit alarm determination mode, the process proceeds to step SC11.

[Step SC10] An upper limit alarm signal is output, and the process proceeds to Step SC5.
[Step SC11] Since it is the upper limit cycle stop mode, an upper limit alarm signal is output and an upper limit cycle stop signal is output, and the process proceeds to Step SC5.
[Step SC12] Since the process has proceeded from Step SC4, the lower limit value determination mode set and stored is read from the memory, and the process proceeds to Step SC13. Note that the setting of the discrimination mode read from the memory is stored in advance by the processing shown in FIGS.

[Step SC13] If the determination mode read in step SC12 is the lower limit value pass / fail determination mode, the process proceeds to step SC14. If it is not the lower limit value pass / fail discrimination mode, the routine proceeds to step SC15.
[Step SC14] A lower limit value defective product signal is output and the process proceeds to Step SC5.
[Step SC15] If the determination mode read in step SC12 is the lower limit alarm determination mode, the process proceeds to step SC16. If it is not the lower limit alarm determination mode, the process proceeds to step SC17.
[Step SC16] A lower limit alarm signal is output, and the process proceeds to Step SC5.
[Step SC17] Since it is the lower limit cycle stop mode, the lower limit alarm signal is output and the lower limit cycle stop signal is output, and the process proceeds to Step SC5.

  In step SC10 of FIG. 7, the upper limit alarm signal is output, and in step SC16, the lower limit alarm signal is output. However, based on the determination result in step SC3 or step SC4, the upper limit value defective product signal in step SC10, In step SC16, a lower limit value defective product signal may be output together. Similarly, an upper limit value defective product signal may be output in step SC11, and a lower limit value defective product signal may be output in step SC17.

In the embodiment shown in FIG. 8, the upper limit value pass / fail discrimination mode, the lower limit pass / fail discrimination mode, the upper limit cycle stop mode, and the lower limit cycle stop mode are determined. Hereinafter, it demonstrates according to each step.
[Step SD1] A measurement value that is a physical quantity is acquired. The measured value of the physical quantity is obtained every predetermined sampling period in one molding cycle. Alternatively, for example, it is stored in a memory of a control device of an injection molding machine such as the RAM 12 and the RAM 14 shown in FIG.
[Step SD2] It is determined whether or not the determination mode is OFF. If the determination mode is OFF, the process proceeds to step SD5. If the determination mode is not OFF, the process proceeds to step SD3.

[Step SD3] It is determined whether or not the measured value exceeds the upper limit value. If it exceeds, the process proceeds to Step SD6, and if not, the process proceeds to Step SD4.
[Step SD4] It is determined whether or not the measured value is below the lower limit value. If the measured value is below the lower limit value, the process proceeds to Step SD10, and if not, the process proceeds to Step SD5.
[Step SD5] The measured value, which is the physical quantity acquired in Step SD1, is displayed.

[Step SD6] Since the process has shifted from Step SD3, the upper limit value determination mode set and stored is read from the memory, and the process proceeds to Step SD7. Note that the setting of the discrimination mode read from the memory is stored in advance by the processing shown in FIGS.
[Step SD7] When the determination mode read in step SD6 is the upper limit value pass / fail determination mode, the process proceeds to step SD8. When it is not the upper limit value pass / fail judgment mode, the process proceeds to step SD9.
[Step SD8] An upper limit value defective product signal is output, and the process proceeds to Step SD5.

[Step SD9] Since it is the upper limit cycle stop mode, an upper limit alarm signal is output and an upper limit cycle stop signal is output, and the process proceeds to step SD5.
[Step SD10] Since the process has shifted from step SD4, the lower limit value determination mode that has been set and stored is read from the memory, and the process proceeds to step SD11. Note that the setting of the discrimination mode read from the memory is stored in advance by the processing shown in FIGS.

[Step SD11] If the determination mode read in step SD10 is the lower limit value pass / fail determination mode, the process proceeds to step SD12. If it is not the lower limit value pass / fail discrimination mode, the process proceeds to step SD13.
[Step SD12] A lower limit value defective product signal is output and the process proceeds to Step SD5.
[Step SD13] Since it is the lower limit cycle stop mode, a lower limit alarm signal is output and a lower limit cycle stop signal is output, and the process proceeds to Step SD5.

  The upper limit value defective product signal may be output in step SD9 based on the determination result in step SD3, and the lower limit value defective product signal may be output in step SD13 based on the determination result in step SD4.

It is a figure explaining selection of the distinction mode in the embodiment of the present invention. It is a schematic block diagram of the injection molding machine which has the discrimination mode setting function which is embodiment of this invention. It is a 1st example of a display screen. It is a 2nd example of a display screen. It is a flowchart which shows the algorithm which sets the discrimination mode in this invention. It is a flowchart which shows the algorithm which patterns and sets the discrimination mode in this invention. 5 is a flowchart showing an algorithm of processing in an upper limit value pass / fail judgment mode, a lower limit pass pass / fail judgment mode, an upper limit alarm judgment lower limit alarm judgment mode, an upper limit cycle stop mode, and a lower limit cycle stop judgment mode in the embodiment of the present invention. is there. It is a flowchart which shows the algorithm of the process of the discrimination mode of upper limit value quality determination mode, lower limit value quality determination mode, upper limit value cycle stop mode, and lower limit value cycle stop mode in embodiment of this invention. It is a figure explaining discrimination | determination in a prior art.

Explanation of symbols

A Upper limit value pass / fail judgment mode B Upper limit alarm discrimination mode C Upper limit cycle stop judgment mode D Lower limit pass / fail judgment mode E Lower limit alarm judgment mode F Lower limit cycle stop judgment mode

Claims (3)

Physical quantity measuring means for measuring physical quantities such as pressure, speed, time, etc. that affect the quality of the molded product of the injection molding machine for each molding cycle;
Pass / fail judgment range setting means for setting upper and lower limits for pass / fail judgment;
An upper limit value determining operation means for comparing the physical quantity measured by the physical quantity measuring means with the set upper limit value of the pass / fail determination and outputting an upper limit value determining operation signal when the measured physical quantity is larger than the upper limit value;
A lower limit value determining operation means for comparing the physical quantity measured by the physical quantity measuring means and the set lower limit value of the pass / fail determination and outputting a lower limit value determining operation signal when the measured physical quantity is smaller than the lower limit value;
A determination mode setting means for individually setting the determination operations of the upper limit value determination operation means and the lower limit value determination operation means;
A quality determination device for an injection molding machine, comprising:   2. The injection molding machine according to claim 1, wherein the determination mode setting unit can set at least one of a determination mode of an output of a defective product signal and an output of an operation stop signal of the injection molding machine. Pass / fail judgment device.   The quality determination device for an injection molding machine according to any one of claims 1 and 2, wherein the determination mode setting means can set and set a combination of determination modes in advance.

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