CN103402732B - Condition of molding diagnostic device - Google Patents

Abstract

Provided is a molding condition diagnostic device capable of diagnosing whether or not preset molding conditions are appropriate based on measured values detected during continuous automatic operation, and notifying an operator. The molding machine is equipped with a molding condition diagnosis device (1) that judges whether the molding condition setting value is appropriate and notifies the operator. The molding condition diagnosis device (1) has: an input unit (2) for the measurement value output from the measurement unit (11) and the molding condition setting value set in the molding condition setting unit (30); ) comparison unit (3) for the input measured value and molding condition setting value; storage unit (4) for storing judgment criteria for judging that the molding condition setting value is inappropriate; whether the comparison result of the comparison unit (3) satisfies The judging unit (5) of the judging criteria stored in the storage unit (4), when the judging unit (5) judges that the comparison result of the comparing unit (3) meets the judging criteria stored in the The unique judgment display corresponding to the measured value and the setting value of the molding condition is output to the monitoring part (6).

Description

Molding Condition Diagnosis Device

technical field

The present invention relates to a molding condition diagnostic device provided in molding machines such as injection molding machines and die-casting machines, and more particularly to a technology for diagnosing whether preset molding conditions are appropriate based on measured values detected during continuous automatic operation.

Background technique

A molding condition setting device for setting molding conditions is attached to a molding machine such as an injection molding machine or a die-casting machine. It is necessary to operate the molding condition setting device and input the required molding conditions corresponding to the molded product before the molding machine is operated. However, since the molding conditions of the molding machine are diverse, skillful setting of the molding conditions is required, and it is difficult for an inexperienced person to efficiently set all the necessary setting items. In order to alleviate the difficulty of such molding condition setting operations, various molding condition setting devices are currently provided (for example, refer to Patent Documents 1, 2, 3) which incorporate ideas and methods for simplifying operations when setting molding conditions Idea to prevent forgetting to change the set value.

prior art literature

patent documents

Patent Document 1: JP-A-5-42571

Patent Document 2: JP-A-2008-114403

Patent Document 3: Patent No. 4094194

Contents of the invention

The problem to be solved by the invention

However, the existing molding machine does not have a unit for diagnosing whether the molding conditions (setting values of each item) input by operating the molding condition setting device are appropriate after the continuous automatic operation starts, and it is impossible to prevent inappropriate Continuous automatic operation is carried out under certain molding conditions, so there is still room for improvement in efficiently producing high-quality molded products.

That is, the basic items of molding conditions do not differ much between factories, but there are some differences in functionality including names and layouts, so it is possible to set inappropriate molding conditions by mistake or forget to set them. Set several molding conditions. Moreover, the setting of molding conditions is carried out by the operator based on his own experience, so it may be possible to input inappropriate molding conditions depending on the situation. If inappropriate molding conditions are set in this way, there will be no direct influence on the mechanical operation of the molding machine, so continuous automatic operation will continue, resulting in the formation of molded products that do not reach the target quality, or failure to obtain the target injection cycle, etc. .

The present invention is proposed to solve the above-mentioned deficiencies in the prior art, and its purpose is to provide a molding condition diagnosis device, which can diagnose whether the preset molding conditions are appropriate based on the measured values detected during continuous automatic operation, and notify the operator.

means to solve the problem

In order to solve the above-mentioned problems, the present invention firstly provides a molding condition diagnostic device, which is provided in a molding machine to determine whether the molding condition setting value is appropriate and notifies the operator. The molding machine has: a mold The opening and closing device of the molding machine and the injection molding device that injects the molding material into the mold of the closed mold repeat the predetermined molding cycle composed of a plurality of processes to form the molding machine body of the predetermined molded product; the operator performs the molding machine body a molding condition setting unit for setting molding conditions; controlling the A control unit for driving the molding machine body; and a measurement unit provided at a predetermined location of the molding machine body, which measures and outputs a predetermined physical quantity at a location provided with the measurement unit, and the molding condition diagnostic device is characterized by having: An input unit for the measurement value output from the measurement unit and the molding condition setting value set in the molding condition setting unit; the measurement value and the molding condition setting value input in the input unit a comparison unit; a storage unit that stores a judgment criterion for judging that the molding condition setting value is inappropriate; a judgment unit that judges whether the comparison result of the comparison unit satisfies the judgment criterion stored in the storage unit, in the When the determination unit determines that the comparison result of the comparison unit satisfies the determination criteria stored in the storage unit, it outputs a unique determination display corresponding to the compared measurement value and the molding condition setting value to the monitor. department.

As mentioned above, when a molding machine such as an injection molding machine or a die-casting machine is in operation, it is required to set the required molding condition setting value corresponding to the molded product on the molding condition setting device attached to the molding machine. Reason: If inappropriate molding condition setting values are set in the molding condition setting device for the molding of the molded product, the molding machine will not stop immediately, but will continue to run continuously and automatically, so the quality of the molded product will suffer. Bad situation in production efficiency. On the other hand, it can be determined whether the measured value output by the measuring unit provided in each part of the molding machine body has a specific relationship with the molding conditions set in the molding condition setting device. Whether the set value of the given molding conditions is inappropriate, the specific relationship can be obtained through experiments and simulations. Therefore, a molding condition diagnostic device having the necessary input unit, comparison unit, storage unit, and determination unit is attached to the molding machine body, and when the determination unit judges that the comparison result of the comparison unit satisfies the judgment criteria stored in the storage unit , the unique judgment display corresponding to the compared measured value and molding condition setting value is output to the monitoring part. Corresponding coping strategies, so that high-quality molded products can be efficiently formed. In addition, depending on the type of molded product, different molding condition setting values are intentionally set from the molding condition setting values when forming a normal molded product. Therefore, no special countermeasures are required at this time.

In order to solve the above-mentioned problems, the present invention secondly provides a molding condition diagnostic device, which is provided in a molding machine, determines whether the molding condition setting value is appropriate and notifies the operator, and the molding machine has: The opening and closing device of the mold and the injection molding device that injects the molding material into the mold of the closed mold, and the molding machine body that repeats a predetermined molding cycle composed of a plurality of processes to mold a predetermined molded product; the operator controls the molding machine body A molding condition setting unit that sets molding conditions; controls the molding conditions based on the molding condition reference value determined by the specifications of the molding machine body and the molding condition setting value set in the molding condition setting unit. A control unit for driving the molding machine main body; and a measurement unit provided at a predetermined position of the molding machine main body, which measures and outputs a predetermined physical quantity at a position provided with the measurement unit, and the molding condition diagnosis device is characterized by having : an input unit for a measurement value output from the measurement unit and the molding condition reference value stored in the control unit; a comparison unit for the measurement value input to the input unit and the molding condition reference value; a storage unit for storing a judgment standard for judging that the molding condition setting value is inappropriate; When the comparison result of the comparison unit satisfies the judgment standard stored in the storage unit, a unique judgment display corresponding to the compared measurement value and the molding condition reference value is output to the monitoring unit.

The second molding condition diagnostic device is configured to compare the measured value output from the measurement unit with the molding condition set value set in the molding condition setting unit through the comparison unit, and the comparison unit compares the first molding condition diagnosis device. The structure of the measurement value output from the measurement unit and the known molding condition reference value determined according to the specifications of the molding machine body. When the molding condition setting value set in the molding condition setting unit is inappropriate, the measured value becomes inconsistent with the molding condition reference value, so by comparing the measurement value with the molding condition reference value, it can be judged that the molding condition setting value is appropriate or inappropriate. Therefore, when the judging section judges that the comparison result of the comparing section satisfies the judging criteria stored in the storage section, by outputting a unique judging display corresponding to the compared measurement value and the molding condition reference value to the monitoring section, it is possible to play the same role as the first. 1 Molding condition diagnosis device has the same effect.

In addition, in the molding condition diagnosing device of the first and second configurations of the present invention, the control unit performs the measurement for a preset number of injections when the operator instructs to diagnose the molding conditions during continuous automatic operation. Next, based on the sampled measurement value, the determination by the determination unit is automatically performed for all the diagnostic items set in advance.

According to this structure, it is possible to diagnose whether the molding condition setting value is appropriate at any time during the continuous automatic operation, so that the continuous automatic operation is not continued for a long time based on an inappropriate molding condition setting value, and high-quality molded products can be efficiently produced. In addition, since the diagnosis of molding conditions is performed during continuous automatic operation, it does not require time for only diagnosis of molding conditions, and the same productivity as conventional molding machines that do not perform diagnosis of molding conditions can be maintained.

In addition, in the molding condition diagnosis device of the present invention, as the diagnosis items, at least one pressure setting, injection timer setting, and pressure holding speed setting in the injection molding process are set in advance in the control unit. ; measurement process time in the measurement process; low pressure mold clamping, low pressure mold clamping torque, and low pressure mold clamping time in the mold opening and closing process, the control unit automatically executes the determination of the determination unit for each of these diagnostic items.

Regarding each diagnostic item mentioned above, whether or not the molding condition setting value is appropriate is determined by comparing the molding condition setting value set in the molding condition setting unit with the measured value output from the measuring unit.

In addition, in the molding condition diagnosis device of the present invention, as the diagnosis items, at least the dwell time setting in the injection molding process, the injection load torque, and the filling rate in the measurement process are preset in the control unit; Suckback setting and measured load torque; and the energization rate to the heating cartridge heater in the temperature control process, the control unit automatically executes the determination of the determination unit for each of these diagnostic items.

Each of the diagnostic items mentioned above judges whether the molding condition set value is appropriate by comparing the molding condition reference value determined according to the specifications of the molding machine body and the measured value output from the measuring unit.

The effect of the invention

The molding condition diagnosis device of the present invention diagnoses whether the molding condition setting value set in the molding condition setting unit is appropriate, so it is possible to prevent continuous automatic operation based on an inappropriate molding condition setting value, and it is possible to efficiently manufacture high-quality products. Quality moldings.

Description of drawings

FIG. 1 is a block diagram showing a configuration of a molding condition diagnostic device according to an embodiment and a configuration of a molding machine provided with the molding condition diagnostic device.

Fig. 2 is a flowchart showing the operation procedure of the molding condition diagnosis device according to the embodiment.

3 is a table view showing diagnostic items, judgment criteria, and judgment messages of the molding condition diagnostic device according to the embodiment.

Fig. 4 is a monitor image related to primary pressure setting of the molding condition diagnosis device according to the embodiment.

FIG. 5 is a monitor image of a single injection timer of the molding condition diagnosis device according to the embodiment.

Fig. 6 is a monitoring image of the dwell speed of the molding condition diagnosis device according to the embodiment.

Fig. 7 is a monitoring image of the dwell time of the molding condition diagnosis device according to the embodiment.

FIG. 8 is a monitor image of the filling rate of the molding condition diagnosis device according to the embodiment.

FIG. 9 is a monitoring image of the measurement time of the molding condition diagnosis device according to the embodiment.

Fig. 10 is a monitor image related to the suckback setting of the molding condition diagnosis device according to the embodiment.

Fig. 11 is a monitor image of low-pressure mold clamping in the molding condition diagnosis device according to the embodiment.

Fig. 12 is a monitor image of low-pressure mold clamping torque in the molding condition diagnosis device according to the embodiment.

Fig. 13 is a monitor image of low-pressure mold clamping time related to the molding condition diagnosis device of the embodiment.

14 is a monitoring image of the energization rate of the molding condition diagnosis device according to the embodiment.

Detailed ways

Embodiments of the molding condition diagnosis device of the present invention will be described below with reference to the drawings. As shown in FIG. 1 , the molding condition diagnosis device 1 of the embodiment is attached to a molding machine composed of a molding machine body 10 , a control unit 20 and a molding condition setting unit 30 , and diagnoses the molding conditions set in the molding condition setting unit 30 Whether the set value is appropriate.

The molding machine body 10 is equipped with a mold opening and closing device and an injection device that injects molding materials into the closed mold, and repeats the molding cycle consisting of the measurement process, mold closing process, injection molding process, mold opening process, and product removal process. To mold a predetermined molded product, it may be any one of an injection molding machine for molding plastic products or a die-casting machine for molding light metal products. A measurement unit (sensor group) 11 that measures and outputs a predetermined physical quantity is provided at a predetermined position of the opening and closing device and the injection molding device. In addition, since the structure of the molding machine main body 10 is a well-known matter and is not the gist of the present invention, description thereof will be omitted.

The control unit 20 is in charge of the overall drive of the molding machine body 10, so the output from the sensor group 11 is based on the molding condition set value set in the molding condition setting unit, the molding condition reference value determined according to the specifications of the molding machine body 10, The measured value data is used to control the opening and closing device of the mold and the drive of the injection molding device, and execute the above-mentioned predetermined molding cycle.

In the molding condition setting unit 30, before the operation of the molding machine body 10 is started, the operator inputs an appropriate molding condition setting value consistent with the characteristics of the molded product to be molded. Any well-known molding condition setting device such as a device. The molding conditions that should be set in the molding condition setting device involve a wide range, for example, primary pressure setting, injection timer setting, pressure holding speed setting, and pressure holding time setting in the injection molding process can be listed; Measurement process time and suckback setting in the measurement process; low pressure mold closing, low pressure mold closing torque and low pressure mold closing time in the mold opening and closing process.

As shown in FIG. 1 , the molding condition diagnosis device 1 has an input unit 2 that acquires measurement value data output from a sensor group 11 and a molding condition setting value set in a molding condition setting unit 30; a comparison unit 3 that performs The comparison between these measured value data and the molding condition setting value; the storage unit 4, which stores the operation program of the molding condition diagnosis device 1, the diagnostic items, the judgment criteria for judging that the molding condition setting value is inappropriate, and the display to the operator. Judgment message etc.; Judging section 5, it judges whether the comparison result of comparing section 3 satisfies the judging criteria stored in storage section 4; Monitoring section 6, its image display judging message; Monitor driver 7, it outputs judging message to monitor unit 6 ; an activation signal output unit 8 that supplies an activation signal of the molding condition diagnosis device 1 to the input unit 2 . In addition, the molding condition diagnosis device 1 may be integrated with the control unit 20 and the molding condition setting unit 30 .

As shown in Figure 2, the operator sets the molding condition setting value in the molding condition setting unit 30, and starts the control unit 20 to start the continuous automatic operation of the molding machine body 10, and then the molding can be started at any time by operating the starting signal output part 8 Condition diagnostic device 1. When the molding condition diagnosis device 1 is activated, the measured value data is sampled for the number of injections preset in the storage unit 4 according to the operation program stored in the storage unit 4, and then the judgment 5 is automatically executed based on the sampled measured value data. Regarding the molding condition diagnosis of all the diagnosis items set in advance, a predetermined judgment message corresponding to the judgment result is output from the output unit 7 and displayed on the monitor unit 6 . The operator can confirm the judgment message, and change the molding condition setting value as necessary. In addition, when the operator judges that there is no need to change the molding condition set value irrespective of the content of the judgment message, the continuous automatic operation can be continued as it is.

As shown in FIG. 3 , in the molding condition diagnostic device 1 of this example, as diagnostic items, the storage unit 4 stores one dwell pressure setting, one injection timer setting, and pressure dwell speed setting in the injection molding process. , holding pressure time setting, injection molding load torque and filling rate; measuring process time, suction setting and measuring load torque in the measuring process; low pressure mold closing, low pressure mold closing torque and low pressure mold opening and closing process The mold clamping time, the energization rate in the temperature control process, and the judgment criteria and judgment messages corresponding to the respective diagnostic items are also stored in the storage unit 4 .

Hereinafter, the meaning and method of the molding condition diagnosis performed by the determination unit 5 will be described for each diagnosis item.

<Primary pressure setting>

The primary pressure setting of the injection molding machine has the meaning of monitoring the pressure, and setting the pressure value (maximum injection pressure) in the speed control so as not to rise above the set value. When the primary pressure is set properly, the control of the maximum injection pressure is speed priority control. As shown in Figure 4(a), the measured value of the maximum injection pressure is always lower than the set value, and the filling speed acts like the set value. In this regard, when the primary pressure setting is too low, the control of the maximum injection pressure becomes pressure priority control when the measured value is about to exceed the set value. As shown in Figure 4(b), the filling speed becomes faster than the set value. slow and cause resin clogging. Therefore, in this example, as shown in the first column of Fig. 3, "the measured value of the maximum injection pressure is greater than or equal to the set value (measured value ≥ set Value)" is stored in the storage unit 4, and as shown in the column, when the measured value exceeds the set value, a judgment message of "becoming pressure control during injection molding" is output to the monitoring unit 6. When the operator corrects the molding conditions based on the judgment message, he can increase the set value of the primary pressure, reduce the injection speed, and increase the resin temperature. When the pressure control is consciously performed by the operator's judgment, it is not necessary to correct the molding conditions based on the judgment message.

<1 injection timer setting>

The one shot timer has the meaning of being a backup timer for one shot time, and when the one shot time during molding exceeds the set time of one shot timer, it is set as one shot abnormality by the control unit 20 The molding machine main body 10 is automatically stopped. Therefore, if the one-time injection timer is set to an inappropriately long time for one injection, even if an abnormality occurs in one injection, the molding machine body 10 will not automatically stop, and problems such as nozzle clogging will occur. For example, as shown in FIG. 5 , regardless of the measured value of 1 injection time being 1.94 sec, when 15 sec is set as the 1 injection timer setting time, such a defect is likely to occur. Therefore, in this example, as shown in the second column of Fig. 3, as the criterion for judging that the setting value of the molding condition is inappropriate, "the set value is the measured value of the injection time + 2 sec or more (the set value ≥ measured value+2sec)" is stored in the storage unit 4, as shown in the column, when the set value exceeds this value, a judgment message of "the injection timer is set too high" is output to the monitoring unit 6. When correcting the molding conditions based on the judgment message, the operator corrects the one-time injection timer to a value about 0.5 sec to 1.0 sec larger than the measured value. When the timer switching method is set to the VP switching method, it is not necessary to correct the molding conditions based on the judgment message.

<Pressure holding speed setting>

The holding speed setting is set to prevent excessive speed during the holding process, burrs and other defects in the molded product, and to limit the maximum speed during the holding process. That is, as shown in Figure 6, the pressure can be suppressed by limiting the speed during the holding pressure. When the holding speed is set properly, a good product can be formed, but when the holding speed is set too high, the molded product will have poor appearance such as burrs . Therefore, in this example, as shown in the third column of Fig. 3, as the criterion for judging that the setting value of the molding condition is not appropriate, the "measured value of the maximum speed of holding pressure is greater than or equal to the set value (measured value ≥ set value) value)" is stored in the storage unit 4, and as shown in the column, when the measured value reaches the set value, a judgment message of "speed control during pressure holding" is output to the monitoring unit 6. When the operator corrects the molding conditions based on the judgment message, the operator performs measures such as lowering the set holding pressure, increasing the setting of the holding pressure speed, and changing the VP switching position. The pressure holding speed setting is mostly used by the operator to control the speed intentionally, and the situations that need to be changed are limited to the cases where the target pressure is not reached due to too low and the excessive speed is generated due to too high.

<Pressure holding time setting>

The dwell time setting is an item to set the time (gate sealing time) for the gate part to solidify and be able to take out the sprue. The gate sealing time is determined according to the specifications of the molding machine body 10 including the mold. In this specification, the value determined according to the specification of the molding machine main body 10 is referred to as a molding condition reference value or simply as a reference value. As shown in Figure 7, at the end of the pressure-holding process, the gate may not be solidified while the screw continues to advance. When the pressure-holding time is set during the period when the screw continues to advance, the molded product cannot be molded well. take out. Therefore, in this example, as shown in the fourth column of Fig. 3, as the criterion for judging that the setting value of the molding condition is not appropriate, "the measured value of the speed at the completion of the holding pressure is 1mm/sec (reference value) or more " is stored in the storage unit 4, and as shown in the column, when the measured value exceeds the reference value, a determination message of "insufficient pressure holding time" is output to the monitoring unit 6. When correcting the molding conditions according to the judgment message, the operator can extend the dwell pressure setting time.

<Injection load torque>

Injection load torque is the torque accumulated in the injection motor when the load is left for the next cycle. When the molding conditions are appropriate, the use time of the injection motor in one cycle is short, so the recovery time of the injection motor is sufficient. There is no accumulation of execution torque in the injection motor, but in the case of extremely short cooling time for injection and holding time, etc. , In each cycle, the injection motor does not recover and the execution torque is accumulated in the injection motor, which eventually produces an overload. This injection load torque is also a reference value determined according to the specifications of the molding machine 10 . Therefore, in this example, as shown in the fifth column of Fig. 3, "the measured value of the injection execution torque is 0% (reference value) or more" is used as the criterion for judging that the setting value of the molding condition is not appropriate. Stored in the storage unit 4 , as shown in the column, when the measured value exceeds the reference value, a determination message of “injection motor generating load” is output to the monitoring unit 6 . When correcting the molding conditions according to the judgment message, the operator can use methods such as prolonging the cooling time and reducing the injection pressure.

<fill rate>

The filling rate is the ratio of the filling amount of one injection molding to the entire product. Considered by the stroke in the molding machine, it is often calculated by the value of the maximum stroke of one injection stroke in one injection. In the case of an electric injection molding machine, as shown in Fig. 8, 90% or more of the filling is performed in one injection, which is effective in adjusting various conditions, and the consideration of the filling rate is one of the factors that determine the VP switching position. a major factor. This filling rate is also a reference value determined according to the specifications of the molding machine main body 10 . In this example, as shown in the sixth column of Fig. 3, the measured value (calculated value) of "fill rate (stroke of one shot/maximum stroke) 90% (reference value) or less" is stored in the storage unit 4, and as shown in the column, when the measured value is less than the reference value, a determination message of "the filling amount is small" is output to the monitoring unit 6. The operator can change the VP switching position when correcting the molding conditions based on the judgment message.

<Measurement process time>

The measurement process time is set as the total time of the measurement delay time, measurement time, and suckback time. In the general molding process, as shown in Figure 9, it is assumed that the measurement process (plasticization process: 19.64 sec) is completed within the cooling set time (20.00 sec). However, the measurement time varies due to various factors, so sometimes The actual measurement process time will exceed the cooling set time. In this way, when the actual measurement process time exceeds the cooling set time, it becomes a factor that the cycle time fluctuates and the production efficiency of molded products decreases. Therefore, in this example, as shown in the seventh column of FIG. 3 , as a judgment criterion for judging that the molding condition setting value is inappropriate, "the measured value of the measurement process is longer than the cooling time" is stored in the storage unit 4, As shown in the column, when the measured value exceeds the cooling time, a determination message that "the measurement process time exceeds the cooling time" is output to the monitoring unit 6 . When correcting the molding conditions based on the judgment message, the operator can shorten the measurement time by increasing the rotational speed of the measurement motor for the measurement conditions, for example.

<Suck back setting>

Suck back setting is to prevent the measuring resin under the back pressure from flowing down from the front end of the nozzle. Basically, it is performed by setting the amount and speed of the screw retreating. However, in the electric molding machine, after the screw Since the end portion is provided with a load cell, as shown in Fig. 10, the injection residual pressure at the time of measurement completion detected by the load cell can be set as a target. The injection residual pressure when the measurement is completed does not necessarily have to be 0, and it is set empirically within the range where the molding material does not flow down from the tip of the nozzle. The injection residual pressure when the measurement is completed without molding material flowing down from the tip of the nozzle is determined according to the specifications of the molding machine main body 10 . Therefore, in this example, as shown in the eighth column of Fig. 3, "the injection residual pressure at the time of completion of the measurement is 1 MPa (reference value) or more" is stored as the criterion for judging that the setting value of the molding condition is not appropriate. In the storage unit 4, as shown in the column, when the injection residual pressure at the time of completion of the measurement is equal to or higher than the reference value, a determination message of “insufficient suction amount” is output to the monitoring unit 6. When correcting the molding conditions according to the judgment message, the operator can increase the amount of suction and reduce the residual injection pressure when the measurement is completed.

<Measurement of load torque>

The measured load torque is the torque accumulated in the measured motor when the motor load is high and left until the next cycle. When the molding conditions are appropriate, the service time of the measuring motor is about half of the 1 cycle time, and the recovery time of the measuring motor is sufficient, so there is no accumulation of execution torque in the measuring motor, but when the motor torque is high and the recovery time is short , in each cycle the motor does not recover the torque accumulated in the measured motor, eventually generating an overload. This measured load torque is also a reference value determined according to the specifications of the molding machine main body 10 . Therefore, in this example, as shown in the ninth column of Fig. 3, "the measured value of the measurement execution torque is 0% (reference value) or more" is stored as the criterion for judging that the setting value of the molding condition is inappropriate. In the storage unit 4 , as shown in the column, when the measured value exceeds the reference value, a determination message of “measurement of motor generated load” is output to the monitoring unit 6 . When correcting the molding conditions based on the judgment message, the operator can use methods such as extending the cycle time.

<Low pressure clamping>

Low-voltage mold clamping is set to measure the motor load torque when the mold of the molding machine is opened and closed, and to detect the rise of the motor load torque when a product or foreign object is caught between the molds, and to prevent mold damage. The molding machine has various functions for ensuring safety and preventing damage, and the low-pressure mold clamping can be set by the operator by operating the molding condition setting unit 30 as shown in FIG. 11 . However, since the low-pressure mold clamping function is highly important for preventing mold damage, it is necessary to notify the operator when the low-pressure mold clamping function is not set to reliably prevent mold damage. Therefore, in this example, as shown in the tenth column of FIG. 3 , as a criterion for judging that the setting value of the molding condition is inappropriate, "the low-pressure mold clamping monitoring device is off" is stored in the storage unit 4, as shown in the column As shown, when the low-voltage mold clamping monitoring device is turned off, a determination message "low-voltage mold closing monitoring device is turned off" is output to the monitoring unit 6. When correcting the molding conditions according to the judgment message, the operator can turn on the low-pressure mold clamping monitoring device.

<Low pressure clamping torque>

As shown in Figure 12, the setting of the low-pressure mold clamping mechanism is based on the torque and time. However, when the set torque is too large relative to the actual torque monitoring, the detection of torque rise is delayed, and the mold Damage Damage spreads. The low-pressure mold clamping torque is set for this purpose, but it is often re-set after the molding state is stabilized, and it can be kept as it is without proper setting at the initial stage. Therefore, when the low-pressure mold clamping torque set by monitoring during continuous operation is inappropriate, it is necessary to remind the operator to pay attention to prevent forgetting to reset. Therefore, in this example, as shown in the 11th column of Fig. 3, as the criterion for judging that the setting value of the molding condition is not appropriate, "the setting value is the measured value of the low-pressure mold clamping torque + 20% or more ( Set value ≥ measured value + 20%)" is stored in the storage part 4, as shown in the column, when the low-pressure mold clamping torque is too large, the monitoring part 6 will output the "low-pressure mold clamping torque setting is too large" Judgment message. When the operator corrects the molding conditions based on the judgment message, as the set value of the low-pressure mold clamping torque, a value higher than about 5 to 10% of the measured value can be set again.

<Low pressure clamping time>

As mentioned above, the setting of the low-pressure mold clamping structure is based on the torque and time, but similar to the case where the torque is not suitable, if the setting time is too long, the detection of the torque rise will be delayed, and the damage of the mold will expand. Therefore, as shown in FIG. 13 , the operator performs setting by operating the molding condition setting unit 30 . Therefore, when the setting of the low-pressure mold closing time is not appropriate, it is necessary to remind the operator to pay attention to optimize the setting. Therefore, in this example, as shown in the twelfth column of Fig. 3, as a criterion for judging that the setting value of the molding condition is inappropriate, the "measured value of the low-pressure mold clamping time is set value + 2 sec or more (measured value ≥set value+2sec)" is stored in the storage unit 4, as shown in the column, when the measured value of the low pressure mold clamping time is too large relative to the set value, the monitoring unit 6 will output "the low pressure mold clamping time is set too Long" judgment message. When correcting the molding conditions based on the judgment message, the operator can set a time as long as about 0.5 to 1 sec of the measured value as the set value of the low-pressure mold clamping time.

<Electricity rate>

The energization rate shows the energization ratio of the plurality of cartridge heaters that are on/off controlled, and as shown in FIG. 14 , a numerical value corresponding to each cartridge heater is displayed. In addition, in FIG. 14, "hopper 2.8" shows the water flow rate related to the cooling under the hopper. When the setting temperature of each heating cartridge heater is inappropriate, the molding material is not properly plasticized, and it is difficult to stably form an excellent product. Therefore, when the set temperature of the heating cartridge heater is inappropriate, it is necessary to remind the operator to optimize the setting. Furthermore, when the set temperature of the heating cylinder heater is not appropriate, the energization rate shows an extreme value, and when a reference value determined according to the specifications of the molding machine body 10 such as 0% and 100% is measured, it can be judged as abnormal. Therefore, in this example, as shown in the 13th column of Fig. 3, "the measured value of the conduction rate is 0% or 100% (reference value)" is stored as a criterion for judging that the setting value of the molding condition is inappropriate. In the storage unit 4 , as shown in the column, when the measured value of the energization rate is the reference value, a determination message of “abnormal energization state” is output to the monitoring unit 6 . When correcting the molding conditions based on the judgment message, the operator can reset the temperature and change the measurement conditions.

As described above, the molding condition diagnosis device 1 of the embodiment can diagnose whether the molding condition setting value set in the molding condition setting unit 30 is appropriate, so that continuous automatic operation can be prevented from being continued based on an inappropriate molding condition setting value. In some cases, high-quality molded products can be efficiently produced.

In addition, in the above-mentioned embodiment, only one pressure setting, one injection timer setting, pressure dwell speed setting, pressure dwell time setting, injection load torque, filling rate, and measurement process are listed as diagnostic items. Time, suction setting, measurement of load torque, low pressure mold clamping, low pressure mold clamping torque, low pressure mold clamping time, and energization rate, but the gist of the present invention is not limited to this, and the presence or absence of suitable abnormalities can be diagnosed for other items .

Explanation of symbols

1 Molding condition diagnosis device

2 input section

3 comparison department

4 storage department

5 Judgment Department

6 Monitoring Department

7 monitor driver

8 Start signal output section

10 Forming machine body

11 Measuring unit (sensor group)

20 control unit

30 Molding condition setting unit

Claims (5)

1. A molding condition diagnosis device provided in a molding machine, which judges whether a molding condition setting value is appropriate and notifies an operator, the molding machine having: a mold opening and closing device and a molding material The injection molding device that injects into the mold of the closed mold, and repeats the predetermined molding cycle consisting of a plurality of processes to form the molding machine body of the predetermined molded product; a molding condition setting unit for the operator to set the molding conditions for the molding machine body; a control unit for controlling the driving of the molding machine body based on the molding condition reference value determined by the specification of the molding machine body and the molding condition setting value set in the molding condition setting unit; and a measurement unit provided at a predetermined location of the molding machine body, which measures and outputs a predetermined physical quantity at a location provided with the measurement unit, The molding condition diagnosis device is characterized by having: an input unit for the measurement value output from the measurement unit and the molding condition setting value set in the molding condition setting unit; a comparison unit for the measured value inputted in the input unit and the molding condition set value; a storage unit for storing a judgment criterion for judging that the molding condition set value is inappropriate; a determination unit that determines whether the comparison result of the comparison unit satisfies a determination criterion stored in the storage unit, When the determination unit determines that the comparison result of the comparison unit satisfies the determination criteria stored in the storage unit, a unique determination display corresponding to the compared measurement value and the molding condition setting value is output. to the Surveillance Department. 2. A molding condition diagnosis device provided in a molding machine, which judges whether a molding condition setting value is appropriate and notifies an operator, the molding machine having: a mold opening and closing device and a molding material The injection molding device that injects into the mold of the closed mold, and repeats the predetermined molding cycle consisting of a plurality of processes to form the molding machine body of the predetermined molded product; a molding condition setting unit for setting molding conditions for the molding machine body by the operator; a control unit for controlling the driving of the molding machine body based on the molding condition reference value determined by the specification of the molding machine body and the molding condition setting value set in the molding condition setting unit; and a measurement unit provided at a predetermined location of the molding machine body, which measures and outputs a predetermined physical quantity at a location provided with the measurement unit, The molding condition diagnosis device is characterized in that it has: an input unit for the measurement value output from the measurement unit and the molding condition reference value stored in the control unit; a comparison unit between the measured value inputted in the input unit and the molding condition reference value; a storage unit for storing a judgment criterion for judging that the molding condition set value is inappropriate; a judging unit that judges whether the comparison result of the comparing unit satisfies a judging criterion stored in the storage unit, When the judging unit judges that the comparison result of the comparing unit satisfies the judging criteria stored in the storage unit, a unique judging display corresponding to the compared measured value and the molding condition reference value is output to the monitor. department. 3. The molding condition diagnosis device according to any one of claims 1 and 2, wherein: When the operator instructs to diagnose the molding conditions during the continuous automatic operation, the control unit samples the measurement value for the preset number of injections, and then, according to the sampled measurement value, samples the preset All diagnostic items are automatically judged by the judgment unit. 4. The molding condition diagnosis device according to claim 3, wherein: As the diagnosis items, at least one pressure setting, injection timer setting, and pressure holding speed setting in the injection molding process; measurement process time in the measurement process; The control unit automatically executes the determination of the determination unit for each of the diagnostic items such as the opening and closing of the low-pressure mold clamping monitoring device, the low-pressure mold clamping torque, and the low-pressure mold clamping time. 5. The molding condition diagnosis device according to claim 3, wherein: As the diagnosis items, at least the dwell time setting, injection load torque, and filling rate in the injection molding process; the suckback setting and measurement load torque in the measurement process; the temperature control process are preset in the control unit. The control unit automatically executes the determination of the determination unit for each of the diagnosis items.