JP2014226890A - Molding diagnostic device - Google Patents

Molding diagnostic device Download PDF

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Publication number
JP2014226890A
JP2014226890A JP2013110262A JP2013110262A JP2014226890A JP 2014226890 A JP2014226890 A JP 2014226890A JP 2013110262 A JP2013110262 A JP 2013110262A JP 2013110262 A JP2013110262 A JP 2013110262A JP 2014226890 A JP2014226890 A JP 2014226890A
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Japan
Prior art keywords
value
deviation
molding
measurement
unit
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JP2013110262A
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Japanese (ja)
Inventor
慶彦 青山
Norihiko Aoyama
慶彦 青山
Original Assignee
東洋機械金属株式会社
Toyo Mach & Metal Co Ltd
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Priority to JP2013110262A priority Critical patent/JP2014226890A/en
Publication of JP2014226890A publication Critical patent/JP2014226890A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating
    • B29C45/78Measuring, controlling or regulating of temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76003Measured parameter
    • B29C2945/7604Temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76177Location of measurement
    • B29C2945/7618Injection unit
    • B29C2945/7621Injection unit nozzle
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76494Controlled parameter
    • B29C2945/76531Temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76655Location of control
    • B29C2945/76658Injection unit
    • B29C2945/76688Injection unit nozzle
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76929Controlling method
    • B29C2945/76939Using stored or historical data sets

Abstract

PROBLEM TO BE SOLVED: To provide a molding diagnostic device which continuously diagnoses operation stability of a molding machine detected during continuous automatic operation, and notifies an operator of the operation stability by displaying a required message on a display device.SOLUTION: In the molding diagnostic device, nozzle temperature is set as a diagnostic item of operation stability of a molding machine body 10 and the reference value of the deviation of the nozzle temperature is stored as a reference value for diagnostic into a memory part 4. When a determination part 5 determines that the deviation between the maximum value and the minimum value of the nozzle temperatures sampled over the shot number set by a shot number setting part 60 is equal to or more than the reference value of the deviation of the nozzle temperature set at the memory part 4, character data saying "There is variation in the nozzle temperature." showing that the deviation of the nozzle temperature is more than the reference value is displayed at a monitor part 6.

Description

  The present invention relates to a molding diagnostic apparatus provided in a molding machine such as an injection molding machine or a die-casting machine, and more particularly to a machine that diagnoses the stability of operation of a molding machine during continuous automatic operation.

  Molding machines such as injection molding machines and die casting machines are equipped with molding condition setting devices that set molding conditions. Prior to the operation of the molding machine, the molding condition setting device is operated to operate a molded product. It is necessary to input required molding conditions according to the conditions. However, since the molding conditions of the molding machine are diverse, skill is required to set the molding conditions, and it is difficult for an unskilled person to efficiently set all the setting items required. In order to alleviate the difficulty of setting molding conditions like this, conventionally, a device for simplifying the operation when setting the molding conditions and a device for preventing forgetting to change the set value have been added. Various molding condition setting devices have been proposed (see, for example, Patent Documents 1, 2, and 3).

JP-A-5-42571 JP 2008-114403 A Japanese Patent No. 4094194

  However, even with a molding machine equipped with the molding condition setting device described in Patent Documents 1, 2, and 3, it is actually possible to mistakenly set inappropriate molding conditions or forget to set some molding conditions. It can be above. Further, since the setting of the molding conditions is performed by the operator based on his / her own experience, the molding conditions different from the appropriate values recommended by the molding machine may be set in some cases. Even if an inappropriate molding condition is set in the molding condition setting device for such a reason, there is no immediate influence on the machine operation of the molding machine, so the molding machine starts a continuous automatic operation according to an instruction from the operator. However, depending on the molding conditions set in the molding condition setting device, the operation of the molding machine becomes unstable during continuous automatic operation, and a molded product that does not reach the target quality is molded, or the target shot cycle is obtained. Inconveniences such as inability to occur may occur.

  In recent molding machines, various sensors are provided in place, and a display device that displays detection data of each sensor in an appropriate format such as a graph display or a list display is provided. Therefore, the operating state of each part of the molding machine during continuous automatic operation can be confirmed by looking at the data displayed on the display device by the operator, and the operational stability of the molding machine is also calculated for multiple shots (molding cycles). This can be confirmed by looking at the changes. However, since the operator is usually responsible for operating a plurality of molding machines alone, it is necessary to continue to check the data displayed on the display device of each molding machine, and the data change for multiple shots is inappropriate. It is practically difficult to quickly determine whether or not it is a problem.

  The present invention has been made to solve such deficiencies in the prior art, and its purpose is to continuously diagnose the operational stability of the molding machine detected during continuous automatic operation, and to provide a display device. An object of the present invention is to provide a molding diagnostic apparatus for displaying a required message and notifying an operator.

  In order to solve the above-described problems, the present invention includes a mold opening / closing device and an injection device for injecting a molding material into a mold clamped by the opening / closing device, and a predetermined molding including a plurality of steps. A molding machine body that continuously molds a predetermined molded product by repeating a cycle, a molding condition setting means for an operator to set molding conditions for the molding machine body, and a molding condition setting set in the molding condition setting means Control means for controlling the driving of the molding machine main body based on the value, and measuring means provided in a predetermined part of the molding machine main body for measuring and outputting a measurement value according to the operating state of the molding machine main body, Is a molding diagnostic apparatus that determines the operational stability of the molding machine main body during continuous automatic operation and informs the operator, and sets the number of shots that serves as a criterion for determining the operational stability. A shot number setting unit, a measurement value of the measurement unit, an input unit of the shot number set in the shot number setting unit, a reference value for determining the operational stability of the molding machine body, and A storage unit that stores measurement values of the measurement unit, a calculation unit that calculates a deviation of the measurement values for the number of shots stored in the storage unit, and the number of inputs of the measurement values to the input unit Determines whether or not the number of shots set in the shot number setting unit has reached the number of shots and whether or not the deviation of the measured value for the number of shots is equal to or greater than a reference value stored in the storage unit A determination unit; and a monitor unit that displays required data in a required format, wherein the determination unit has a deviation of the measured value for the number of shots equal to or greater than a reference value stored in the storage unit. When the determination is made, the control means And outputs the specific determination display corresponding separately to the monitor unit.

  The diagnostic items of the molding machine main body include at least one item selected from nozzle temperature, primary injection time, mold opening time, mold closing time, and molded product removal time, filling pressure, metering motor torque, and screw during metering. Can be set in the storage unit. In addition, as the reference value, the reference value of the deviation of the nozzle temperature, the reference value of the deviation relating to the primary injection time, the mold opening time, the mold closing time and the removal time of the molded product, depending on the diagnosis item, filling from the start of filling Reference value for deviation of filling pressure for each measurement time until the end, reference value for deviation of weighing motor torque for each measurement time from the start of measurement to the end of measurement, Retreat speed of the screw for each measurement time from the start of measurement to the end of measurement The reference value of the deviation can be stored.

  Diagnosis of the molding machine body can be performed separately for each diagnostic item, and when the diagnosis of the molding machine body is instructed by the operator during continuous automatic operation, all diagnostic items set in the storage unit are automatically It can also be executed automatically.

  In the molding diagnosis apparatus of the present invention, when the determination unit determines that the deviation of the measurement value for the number of shots is equal to or greater than the reference value stored in the storage unit, the control unit displays a specific determination display according to the type of the measurement value Is output to the monitor unit, the operator can reliably recognize the operational stability of the molding machine body. Therefore, it becomes possible for an operator to take an appropriate response quickly, and a good product can be manufactured with high efficiency.

It is a block diagram which shows the structure of the shaping | molding diagnostic apparatus which concerns on embodiment, and the structure of the molding machine with which this is provided. It is a flowchart which shows the operation | movement procedure of the shaping | molding diagnostic apparatus which concerns on embodiment. It is a table | surface figure which shows the diagnostic item, determination criteria, and determination message of the shaping | molding diagnostic apparatus which concern on embodiment. It is a monitor image which shows the measurement data of the primary injection time and mold opening time which are measured with the molding machine which concerns on embodiment. It is a monitor image which shows the measurement data of the filling pressure measured with the molding machine which concerns on embodiment. It is a monitor image which shows the metering motor torque measured with the molding machine which concerns on embodiment, and the screw reverse speed at the time of a measurement process.

  Hereinafter, an embodiment of a molding diagnostic apparatus according to the present invention will be described with reference to the drawings. It should be noted that the gist of the present invention is not limited to the following embodiments, and it is needless to say that the gist of the present invention can be easily applied to molding machines having other configurations without departing from the spirit of the invention.

  As shown in FIG. 1, the molding diagnostic apparatus 1 according to the embodiment includes a molding machine body 10 including a sensor group (measuring unit) 11, a control unit 20, and a molding condition setting unit 30. The operation stability of the molding machine body 10 during continuous automatic operation is diagnosed. The molding diagnostic apparatus 1 includes a start switch 40, an input device 50 for inputting a diagnostic item of the molding machine body 10 and a reference value of operational stability regarding each diagnostic item, and a calculation of the operational stability of the molding machine body 10. A shot number setting unit 60 is provided for setting the number of shots, which is the number of samples of measurement value data output from the sensor group 11.

  The molding machine main body 10 includes a mold opening / closing device and an injection device that injects a molding material into the clamped mold, and includes a metering process, a mold closing process, a mold clamping process, an injection process, a mold opening process, and A predetermined molded product is formed by repeating a predetermined molding cycle including a product removal step and the like. The molding machine body 10 according to the embodiment may be either an injection molding machine that molds plastic products or a die casting machine that molds light metal products. The sensor group 11 is installed in a predetermined part of the opening / closing device and the injection device, and outputs appropriate measurement value data according to the operating state of the molding machine body 10 during continuous automatic operation. The measurement value data output from these sensor groups 11 is input to the molding diagnostic apparatus 1 and the control means 20. A peripheral device (not shown) such as a product take-out device is also arranged around the molding machine body 10 as necessary. The configurations of the molding machine main body 10 and peripheral devices are known matters and are not the gist of the present invention.

  The control means 20 is responsible for overall driving of the molding diagnostic apparatus 1, the molding machine body 10, and peripheral devices, and molding conditions determined by the molding condition setting values set in the molding condition setting means 30 and the specifications of the molding machine body 10. Based on the reference value and the measured value data output from the sensor group 11, the driving of the mold opening / closing device and the injection device is controlled, and the predetermined molding cycle described above is repeatedly executed.

  The molding condition setting means 30 is for the operator to input an appropriate molding condition setting value that matches the characteristics of the molded product to be molded before the molding machine body 10 starts operation. Any molding condition setting device belonging to the public knowledge such as those described in No. 3 can be used. The molding conditions to be set in the molding condition setting device 30 are various. For example, primary pressure setting in the injection process, injection timer setting, pressure holding speed setting, pressure holding time setting, measuring process time in the measuring process, and suckback Examples include low pressure mold clamping, low pressure mold clamping torque, and low pressure mold clamping time in the setting and mold opening / closing process.

  As shown in FIG. 1, the molding diagnostic apparatus 1 is input to the measured value data output from the sensor group 11, the control signal output from the control means 20, the switch signal output from the start switch 40, and the input device 50. The input unit 2 takes in the diagnostic item data, the reference value data, the determination message to be displayed to the operator, and the shot number data set in the shot number setting unit 60. In addition, the molding diagnosis apparatus 1 includes the storage unit 4 that stores the above-described data captured in the input unit, and the maximum value of the measurement value data sampled over the number of shots set in the shot number setting unit 60. It has the calculating part 3 which calculates the deviation of the minimum value. Further, the molding diagnostic apparatus 1 determines whether or not the number of measurement value data input to the input unit 2 has reached the number of shots set in the shot number setting unit 60 and the number of shots determined by the calculation unit 3. The determination unit 5 determines whether or not the deviation of the measured value data is larger than the reference value data stored in the storage unit 4. In addition, the molding diagnosis apparatus 1 includes a monitor unit 6 that displays various data stored in the calculation unit 3 and a required determination message according to the determination result of the determination unit 5 in a predetermined format, and the required data. The monitor driver 7 for outputting to the monitor unit 6 in the form of The molding condition diagnosis apparatus 1 can also be configured integrally with the above-described control unit 20 and molding condition setting unit 30.

  The molding diagnostic apparatus 1 is activated when the operator operates the activation switch 40, and for each diagnostic item stored in the storage unit 4, a deviation of measured value data for a predetermined number of shots is stored in the storage unit 4. It is automatically determined whether or not it is larger than the reference value data, and a molding diagnosis relating to a required diagnosis item is performed. That is, as shown in FIG. 2, the operator sets a molding condition setting value in the molding condition setting unit 30 and activates the control unit 20 to start continuous automatic operation of the molding machine body 10. By operating, the molding diagnostic apparatus 1 can be started at any time. When the molding diagnostic apparatus 1 is activated, the measurement value data is sampled for the number of shots preset in the storage unit 4 in accordance with the operation program stored in the storage unit 4, and based on the sampled measurement value data Thus, a molding diagnosis for a preset diagnostic item is automatically executed by the determination unit 5. A predetermined determination message corresponding to the determination result is read from the storage unit 4, output from the monitor driver 7, and displayed on the monitor unit 6. The operator can confirm the determination message and take necessary countermeasures such as changing the molding condition setting value as necessary.

  When the operator determines that the change of the molding condition setting value or the like is unnecessary regardless of the content of the determination message, the continuous automatic operation can be continued as it is. In addition, the above-described molding diagnosis can be performed continuously for all diagnostic items stored in the storage unit 4 when the molding diagnosis apparatus 1 is activated, or selected by the operator. It is also possible to selectively perform only the molding diagnosis for the diagnosis items.

  As shown in FIG. 3, in the molding diagnostic apparatus 1 of this example, at least one item selected from the nozzle temperature, the primary injection time, the mold opening time, the mold closing time, and the molded product take-out time as diagnostic items, Filling pressure (primary injection pressure), metering motor torque, screw retraction speed during metering, and the like are set in the storage unit 4. In addition, as the reference value, the reference value of the deviation of the nozzle temperature, the reference value of the deviation relating to the primary injection time, the mold opening time, the mold closing time and the removal time of the molded product, depending on the diagnosis item, filling from the start of filling Reference value for deviation of filling pressure for each measurement time until the end, reference value for deviation of weighing motor torque for each measurement time from the start of measurement to the end of measurement, Retreat speed of the screw for each measurement time from the start of measurement to the end of measurement Is stored in the storage unit 4. As is apparent from FIG. 3, an allowable range for manufacturing a non-defective product with high efficiency is set as a reference value for each deviation.

  Hereinafter, a specific example of the molding diagnosis performed by the determination unit 5 will be described for each diagnosis item.

<Nozzle temperature>
Since the injection nozzle provided in the injection device directly contacts the mold during the continuous automatic operation, the temperature variation is most likely to occur. When the nozzle temperature fluctuates, the viscosity of the molding material injected into the mold cavity fluctuates, which may adversely affect the quality of the molded product. PID control is usually used for temperature control of the injection nozzle, and initial tuning is performed in the initial state. However, the state of the injection nozzle can be changed by changing the type of the injection nozzle according to the mold or by screw maintenance. When the value of PID changes, the tuning of PID control may shift. Therefore, in the present embodiment, nozzle temperature data output from the temperature sensor provided in the injection nozzle is continuously taken into the storage unit 4 for a predetermined number of shots (for example, 50 shots or 100 shots). The deviation between the maximum value and the minimum value of the nozzle temperature data is obtained by the calculation unit 3. When the obtained deviation is a reference value of nozzle temperature deviation, for example, 5 ° C. or more, a determination message “nozzle temperature varies” is displayed on the monitor unit 6 as shown in FIG. To do. In addition to this, an explanatory note “auto tuning (nozzle required)” is displayed on the monitor unit 6. As a result, the operator can easily recognize that the nozzle temperature varies more than the reference value and can quickly take an appropriate countermeasure. Accordingly, since the operation of the molding machine main body 10 can be stabilized as a total, a molded product having a target quality can be manufactured in a target shot cycle.

<Primary injection time>
The primary injection time is not affected by the suitability of the molding conditions set in the molding condition setting means 30, and there is an abnormality in various servo motors provided in the molding machine body 10 or the time when the peripheral device operates. Variation occurs when a large variation occurs. Therefore, by calculating the variation of the primary injection time, it is possible to estimate the occurrence of abnormality in various servo motors and peripheral devices. Therefore, in the present embodiment, primary injection time data is continuously taken into the storage unit 4 over a predetermined number of shots (for example, 50 shots or 100 shots), and the maximum value and minimum value of the taken primary injection time data are taken. The value deviation is obtained by the calculation unit 3. When the obtained deviation is a reference value of the deviation of the primary injection time, for example, 0.1 sec or more, as shown in FIG. 3, the monitor unit 6 “varies in the primary injection time” Is displayed. In addition, an explanatory note “Please check the state of the molding machine and peripheral machine” is displayed on the monitor unit 6. As a result, the operator can easily recognize that the primary injection time varies more than the reference value and can quickly take an appropriate countermeasure. Accordingly, since the operation of the molding machine main body 10 can be stabilized as a total, a molded product having a target quality can be manufactured in a target shot cycle. The measurement data of the primary injection time is displayed as a list with numerical values on the monitor unit 6 for each shot, as shown in FIG.

<Mold opening time>
Similarly to the primary injection time, the mold opening time is not affected by the suitability of the molding conditions set in the molding condition setting means 30, and there are abnormalities in various servo motors provided in the molding machine body 10, or peripheral devices Variation occurs when temporal variation occurs in the operation process. Therefore, it is possible to estimate the occurrence of abnormality in various servo motors and peripheral devices by calculating the variation in mold opening time. Therefore, in the present embodiment, the mold opening time data is continuously taken into the storage unit 4 over a predetermined number of shots (for example, 50 shots or 100 shots), and the maximum value and the minimum value of the fetched mold opening time data are set. The deviation is obtained by the calculation unit 3. When the obtained deviation is a reference value of the deviation of the mold opening time, for example, 0.1 sec or more, as shown in FIG. 3, the monitor 6 determines that there is a variation in the mold opening time. Display a message. In addition, an explanatory note “Please check the state of the molding machine and peripheral machine” is displayed on the monitor unit 6. As a result, the operator can easily recognize that the mold opening time is more than the reference value and can quickly take an appropriate countermeasure. Accordingly, since the operation of the molding machine main body 10 can be stabilized as a total, a molded product having a target quality can be manufactured in a target shot cycle. The mold opening time measurement data is displayed as a list with numerical values on the monitor unit 6 for each shot, as shown in FIG. FIG. 4 shows measurement data of the mold opening time at normal time. As is apparent from this figure, the mold opening time is very stable at normal time.

<Mold closing time>
Similarly to the primary injection time, the mold closing time is not affected by the suitability of the molding conditions set in the molding condition setting means 30, and there are abnormalities in various servo motors provided in the molding machine body 10 or when peripheral devices are Variation occurs when temporal variation occurs in the operation process. Therefore, by calculating the variation in mold closing time, it is possible to estimate the occurrence of abnormality in various servo motors and peripheral devices. Therefore, in the present embodiment, the mold closing time data is continuously taken into the storage unit 4 over a predetermined number of shots (for example, 50 shots or 100 shots), and the maximum value and the minimum value of the fetched mold closing time data are set. The deviation is obtained by the calculation unit 3. If the obtained deviation is a reference value of the mold closing time deviation, for example, 0.1 sec or more, as shown in FIG. 3, the monitor unit 6 determines that “the mold closing time varies”. Display a message. In addition, an explanatory note “Please check the state of the molding machine and peripheral machine” is displayed on the monitor unit 6. As a result, the operator can easily recognize that the mold closing time is more than the reference value and can quickly take an appropriate countermeasure. Accordingly, since the operation of the molding machine main body 10 can be stabilized as a total, a molded product having a target quality can be manufactured in a target shot cycle.

<Molded product removal time>
Similarly to the primary injection time, the molded product take-out time is not affected by the suitability of the molding conditions set in the molding condition setting means 30, and there are abnormalities in various servo motors provided in the molding machine body 10, or peripheral devices. Variation occurs when there is a temporal variation in the process of operating. Therefore, it is possible to estimate the occurrence of abnormalities in various servo motors and peripheral devices by calculating the variation in the molded product removal time. Therefore, in the present embodiment, the molded product take-out time data is continuously taken into the storage unit 4 over a predetermined number of shots (for example, 50 shots or 100 shots), and the maximum value and the minimum of the taken-in molded product take-out time data The value deviation is obtained by the calculation unit 3. When the obtained deviation is a reference value of the deviation of the molded article take-out time, for example, 0.1 sec or more, as shown in FIG. Display a judgment message. In addition, an explanatory note “Please check the state of the molding machine and peripheral machine” is displayed on the monitor unit 6. As a result, the operator can easily recognize that the mold closing time is more than the reference value and can quickly take an appropriate countermeasure. Accordingly, since the operation of the molding machine main body 10 can be stabilized as a total, a molded product having a target quality can be manufactured in a target shot cycle.

<Filling pressure (primary pressure)>
Immediately after the start of continuous automatic operation, the mold temperature and molding material temperature are not stable, so there is some variation in the measured data of the filling pressure, but after that, the filling pressure is measured as the number of shots increases. The value data becomes stable. Therefore, for the filling pressure, even if the measured value data varies, it is not appropriate to take immediate measures, and the measured value data varies depending on the mold temperature or molding material temperature immediately after the start of continuous automatic operation. It is necessary to check whether it is based on instability. Therefore, in the present embodiment, filling pressure data for each measurement time from the start of injection to the end of injection is continuously taken into the storage unit 4 over a predetermined number of shots (for example, 50 shots or 100 shots). The filling pressure data taken into the storage unit 4 has a waveform as shown in FIG. 5 when an image is displayed on the monitor unit 5. The computing unit 3 obtains a deviation e between the maximum value and the minimum value of the filling pressure data for each measurement time from the start of injection to the end of injection based on the filling pressure data taken into the storage unit 4. When the obtained deviation is equal to or larger than the reference value of the filling pressure deviation, a determination message “resin pressure state is changing” is displayed on the monitor unit 6 as shown in FIG. In addition to this, an explanatory note “The pressure value is changing and needs to be diagnosed again” is displayed on the monitor unit 6. As a result, the operator can easily recognize that there is a variation in the filling pressure that exceeds the reference value, and the re-diagnosis causes the variation to be instability in the mold temperature and molding material temperature immediately after the start of continuous automatic operation. Since it can be confirmed whether it is based, unnecessary confirmation work and maintenance can be avoided, and the productivity of the molding machine body 10 as a whole can be increased.

<Weighing motor torque>
Immediately after the start of continuous automatic operation, the measured value data of the metering motor torque varies to some extent because the heating cylinder temperature is not stable, but thereafter the measured value data of the metering motor torque as the number of shots increases. Becomes stable. Therefore, as with the filling motor (primary pressure), even if the measured value data varies, it is not appropriate to take a countermeasure immediately, and the measured value data varies continuously and automatically. It is necessary to confirm whether or not this is based on instability of the heating cylinder temperature immediately after the start of the operation. Therefore, in the present embodiment, metering motor torque data for each measurement time from the start of measurement to the end of measurement is continuously taken into the storage unit 4 over a predetermined number of shots (for example, 50 shots or 100 shots). The metering motor torque data taken into the storage unit 4 has a waveform as shown in FIG. 6 when the monitor unit 5 displays an image. The calculation unit 3 obtains a deviation e between the maximum value and the minimum value of the weighing motor torque data for each measurement time from the start of measurement to the end of measurement, based on the measurement motor torque data taken into the storage unit 4. When the obtained deviation is equal to or larger than the reference value of the deviation of the metering motor torque, a determination message “Measuring motor torque is changing” is displayed on the monitor unit 6 as shown in FIG. In addition to this, an explanatory note “Weighing motor torque is fluctuating and needs to be diagnosed again” is displayed on the monitor 6. As a result, the operator can easily recognize that there is a variation exceeding the reference value in the metering motor torque, and whether the variation is based on the instability of the heating cylinder temperature immediately after the start of continuous automatic operation by re-diagnosis. Since it can be confirmed, unnecessary confirmation work and maintenance can be avoided, and the productivity of the molding machine body 10 as a whole can be increased.

<Reverse speed of screw during weighing>
Immediately after the start of continuous automatic operation, the heating cylinder temperature is not stable, so there is some variation in the measured value data of the screw retraction speed during weighing, but after that the screw retreats as the number of shots increases. Speed measurement data becomes stable. Therefore, as with the metering motor torque, even if the measured value data varies, it is not appropriate to take immediate measures for the screw retraction speed, and the measured value data varies immediately after the start of continuous automatic operation. It is necessary to confirm whether or not this is based on the instability of the heating cylinder temperature. Therefore, in the present embodiment, the screw retraction speed data for each measurement time from the start of measurement to the end of measurement is continuously taken into the storage unit 4 over a predetermined number of shots (for example, 50 shots or 100 shots). The screw retraction speed data taken into the storage unit 4 has a waveform as shown in FIG. The calculation unit 3 obtains a deviation e between the maximum value and the minimum value of the screw reverse speed data for each measurement time from the start of measurement to the end of measurement based on the reverse speed data of the screw taken into the storage unit 4. When the obtained deviation is equal to or larger than the reference value of the deviation of the screw reverse speed, a determination message “Screw reverse speed is changing” is displayed on the monitor unit 6 as shown in FIG. . In addition to this, an explanatory note “Screw retraction speed is fluctuating and needs to be diagnosed again” is displayed on the monitor unit 6. As a result, the operator can easily recognize that the screw retraction speed has a variation exceeding the reference value, and the variation is based on the instability of the heating cylinder temperature immediately after the start of continuous automatic operation. Therefore, unnecessary confirmation work and maintenance can be avoided, and the productivity of the molding machine body 10 as a whole can be increased.

  As described above, in the molding diagnostic apparatus 1 according to the embodiment, when the determination unit 5 determines that the deviation of the measurement value for the number of shots is equal to or larger than the reference value stored in the storage unit 4, the control unit 30 performs the measurement. Since a unique determination display corresponding to the type of value is output to the monitor unit 6, the operator can reliably recognize the operational stability of the molding machine body 10. Further, even when the determination unit 5 determines that the variation in the operation of the molding machine main body 10 is larger than the reference value, the operator can quickly take an appropriate response, so that a non-defective product is manufactured with high efficiency. be able to.

  In the above embodiment, as diagnostic items, at least one item selected from the nozzle temperature, the primary injection time, the mold opening time, the mold closing time, and the molded product removal time, the filling pressure (primary pressure), and the measurement Although the motor torque and the retraction speed of the screw at the time of metering are mentioned, the gist of the present invention is not limited to this, and other matters can be diagnosed as appropriate.

DESCRIPTION OF SYMBOLS 1 Molding diagnostic apparatus 2 Input part 3 Comparison part 4 Memory | storage part 5 Judgment part 6 Monitor part 7 Monitor driver 10 Molding machine main body 11 Measuring means (sensor group)
DESCRIPTION OF SYMBOLS 20 Control means 30 Molding condition setting means 40 Start switch 50 Input device 60 Shot number setting part

Claims (7)

  1. A mold opening / closing device and an injection device for injecting a molding material into a mold clamped by the opening / closing device, and continuously performing a predetermined molding cycle by repeating a predetermined molding cycle consisting of a plurality of steps. A molding machine main body to be molded, a molding condition setting means for an operator to set molding conditions for the molding machine main body, and control of driving of the molding machine main body based on a molding condition setting value set in the molding condition setting means Control means, and a measuring means provided in a predetermined part of the molding machine main body, and measuring means for measuring and outputting a measured value according to the operating state of the molding machine main body. A molding diagnostic apparatus that determines the operational stability of the molding machine main body during and notifies the operator of the operation stability,
    A shot number setting unit for setting the number of shots that is a criterion for determining the operational stability, a measurement value of the measurement unit, an input unit for the shot number set in the shot number setting unit, and the molding machine main body A storage unit for storing the reference value for determining the operational stability of the measurement unit and the measurement value of the measurement unit, and a calculation unit for calculating the deviation of the measurement value for the number of shots stored in the storage unit And whether the number of measurement values input to the input unit has reached the number of shots set in the shot number setting unit, and the deviation of the measurement values for the number of shots is stored in the storage unit A determination unit that determines whether or not the calculated reference value is greater than or equal to the reference value, and a monitor unit that displays required data in a required format,
    When the determination unit determines that the deviation of the measurement value for the number of shots is equal to or greater than a reference value stored in the storage unit, the control unit performs a specific determination according to the type of the measurement value. A molding diagnostic apparatus that outputs a display to the monitor unit.
  2.   In the storage unit, a nozzle temperature is set as a diagnostic item of the molding machine main body, a reference value of a deviation of the nozzle temperature is stored as the reference value, and the determination unit is set in the shot number setting unit When it is determined that the deviation between the maximum value and the minimum value of the measured values sampled over the number of shots is equal to or greater than a reference value of the deviation of the nozzle temperature set in the storage unit, the monitor unit The molding diagnosis apparatus according to claim 1, wherein character data indicating that a deviation in nozzle temperature is larger than the reference value is displayed.
  3.   In the storage unit, as a diagnostic item of the molding machine main body, at least one item selected from a primary injection time, a mold opening time, a mold closing time and a molded product take-out time is set, and as the reference value, The reference value of the deviation related to the time listed as the diagnostic item is stored, and the determination unit has a deviation between the maximum value and the minimum value of the measurement value sampled over the number of shots set in the shot number setting unit. Is determined to be greater than or equal to the reference value of the time deviation set in the storage unit, the diagnostic unit determined to be greater than or equal to the reference value of the time deviation to the monitor unit 2. The molding diagnostic apparatus according to claim 1, wherein character data indicating that the deviation is larger than a reference value is displayed.
  4.   In the storage unit, a filling pressure is set as a diagnostic item of the molding machine main body, and a reference value of a deviation of the filling pressure for each measurement time from the start of filling to the end of filling is stored as the reference value. The deviation between the maximum value and the minimum value of the measured values sampled over the number of shots set in the shot number setting unit is equal to or greater than the reference value of the deviation of the filling pressure set in the storage unit. 2. The molding diagnostic apparatus according to claim 1, wherein character data indicating that a deviation of the filling pressure is larger than the reference value is displayed on the monitor unit when the determination is made.
  5.   In the storage unit, a measurement motor torque is set as a diagnostic item of the molding machine body, and a reference value of a deviation of the measurement motor torque for each measurement time from the start of measurement to the end of measurement is stored as the reference value. The deviation between the maximum value and the initial value of the measured value sampled over the number of shots set by the shot number setting unit is a reference value of the deviation of the metering motor torque set in the storage unit 2. The molding diagnostic apparatus according to claim 1, wherein when it is determined as above, character data indicating that the deviation of the metering motor torque is larger than the reference value is displayed on the monitor unit.
  6.   In the storage unit, as a diagnostic item of the molding machine body, the screw retraction speed at the time of measurement is set, and the reference value of the deviation of the screw retraction speed for each measurement time from the start of measurement to the end of measurement is used as the reference value. And the deviation between the maximum value of the measured value and the initial value sampled over the number of shots set in the shot number setting unit is the deviation of the screw set in the storage unit. The character data indicating that the deviation of the backward speed of the screw is larger than the reference value is displayed on the monitor unit when it is determined that the deviation is equal to or larger than the reference value of the deviation of the backward speed. The molding diagnostic apparatus according to 1.
  7.   The determination unit performs sampling of the measured value over the number of shots set in the shot number setting unit when the operation stability diagnosis is instructed by an operator during continuous automatic operation. 8. The determination for all diagnostic items set in the storage unit is automatically executed based on the measurement value and the reference value stored in the storage unit. The molding diagnostic apparatus according to any one of the preceding claims.
JP2013110262A 2013-05-24 2013-05-24 Molding diagnostic device Pending JP2014226890A (en)

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PCT/JP2014/063487 WO2014189083A1 (en) 2013-05-24 2014-05-21 Molding diagnosis device

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN106003589A (en) * 2016-06-29 2016-10-12 苏州天朋精密元器件有限公司 Plastic mold with counting function

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JPH03101914A (en) * 1989-09-18 1991-04-26 Japan Steel Works Ltd:The Predicting method and device for abnormality in injection molding machine
JP2004155089A (en) * 2002-11-07 2004-06-03 Nissei Plastics Ind Co Method for setting discriminating condition of molded product
JP2008506564A (en) * 2004-07-19 2008-03-06 ウーメトリックス アーベー System and method for parametric injection molding
WO2012115105A1 (en) * 2011-02-23 2012-08-30 東洋機械金属株式会社 Molding condition diagnostic device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03101914A (en) * 1989-09-18 1991-04-26 Japan Steel Works Ltd:The Predicting method and device for abnormality in injection molding machine
JP2004155089A (en) * 2002-11-07 2004-06-03 Nissei Plastics Ind Co Method for setting discriminating condition of molded product
JP2008506564A (en) * 2004-07-19 2008-03-06 ウーメトリックス アーベー System and method for parametric injection molding
WO2012115105A1 (en) * 2011-02-23 2012-08-30 東洋機械金属株式会社 Molding condition diagnostic device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106003589A (en) * 2016-06-29 2016-10-12 苏州天朋精密元器件有限公司 Plastic mold with counting function

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WO2014189083A1 (en) 2014-11-27

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