JP5815451B2 - Management device for injection molding machine having frequency characteristic management function - Google Patents

Description

  The present invention relates to an injection molding machine, and more particularly to an apparatus for centrally managing frequency characteristics of an injection molding machine.

  Conventionally, a technique is known in which the frequency characteristics of a movable part of an injection molding machine is measured, the deterioration state of the movable part is estimated by checking the characteristic change of the frequency characteristic and the presence or absence of resonance, or the characteristics of the controlled object are estimated. . However, a technique for centrally managing the frequency characteristics of a plurality of injection molding machines connected via a network using a centralized management device has not been known. Therefore, for example, there has been no means for comparing the frequency characteristics of a plurality of injection molding machines to efficiently grasp the characteristics of the resin obtained based on the frequency characteristics and the characteristics of the movable part of the injection molding machine.

  For example, in patent document 1, the monitor data detected for every predetermined period by the shaping | molding monitor apparatus are memorize | stored for every data classification, the stored monitor data is analyzed for every predetermined period, and the approximation which shows the transition tendency of monitor data Although a technology is disclosed that outputs a maintenance warning when the trend of transition by approximate function reaches a level for determining consumable parts, the frequency characteristics of multiple injection molding machines connected via a network are disclosed. It was not intended to be centrally managed by a centralized management device.

JP 4-110125 A

  In view of the above-described problems of the prior art, the present invention centrally manages the frequency characteristics of a plurality of injection molding machines connected via a network by using a central management device, thereby improving the resin characteristics of the plurality of injection molding machines. It is an object of the present invention to provide an injection molding machine management apparatus having a frequency characteristic management function capable of efficiently grasping the characteristics of a movable part.

The invention according to claim 1 of the present application is a management apparatus for an injection molding machine that centrally manages a plurality of injection molding machines connected by a network, and calculates frequency characteristic data when a movable part of the injection molding machine is driven. A response data acquisition unit for acquiring response data necessary for the plurality of injection molding machines, a frequency characteristic data calculation unit for calculating the frequency characteristic data of the movable part from the acquired response data, and the calculated frequency characteristic data And an average frequency characteristic for calculating average frequency characteristic data from frequency characteristic data of some or all of the plurality of injection molding machines. A deviation calculating unit that calculates a deviation of the frequency characteristic data of each injection molding machine with respect to the average frequency characteristic data; and a deviation of the calculated frequency characteristic data. A management device for an injection molding machine, characterized in that it comprises an alarm output unit for outputting an alarm when it exceeds the value.
The invention according to claim 2 is an injection molding machine management apparatus that centrally manages a plurality of injection molding machines connected by a network, and is necessary for calculating frequency characteristic data when driving a movable part of the injection molding machine. a response data acquisition unit that acquires Do response data from said plurality of injection molding machines, a storage unit for storing the response data to which the acquired for each injection molding machine, the frequency characteristic data of the movable portion from the response data said memory A frequency characteristic calculation unit for calculating, an average frequency characteristic calculation unit for calculating average frequency characteristic data from the frequency characteristic data of some or all of the plurality of injection molding machines, A deviation calculating unit that calculates a deviation of the frequency characteristic of each injection molding machine with respect to the average frequency characteristic data, and an alarm is issued when the calculated deviation of the frequency characteristic exceeds a threshold value. A management device for an injection molding machine, characterized in that it comprises an alarm output unit for.
According to a third aspect of the invention, the frequency characteristic data when the movable part is driven is at least one of position loop frequency characteristic data, velocity loop frequency characteristic data, current loop frequency characteristic data, and pressure loop frequency characteristic data of the movable part. It is one, The management apparatus of the injection molding machine as described in any one of Claim 1 or 2 characterized by the above-mentioned .
The invention according to claim 4 is the operation time of each injection molding machine, the cumulative number of shots of each injection molding machine, the cumulative load of the movable part of each injection molding machine, the start or completion of production of each injection molding machine, and each injection molding machine A measurement command unit for outputting a response data measurement command to an injection molding machine connected to the network based on any of the following conditions: change of molding conditions, elapse of a predetermined maintenance time, and operator instruction to the management device The management apparatus for an injection molding machine according to any one of claims 1 to 3.
The invention according to claim 5 is the management apparatus for an injection molding machine according to any one of claims 1 to 4 , further comprising a display unit that displays the frequency characteristic data .

  According to the present invention, the frequency characteristics of a plurality of injection molding machines connected via a network are centrally managed by a central management device, thereby efficiently grasping the resin characteristics and the movable part characteristics of the plurality of injection molding machines. Therefore, it is possible to provide an injection molding machine management device having a frequency characteristic management function.

It is a figure explaining the system comprised by connecting a centralized management apparatus and several injection molding machines via LAN. It is a figure explaining the frequency characteristic and average frequency characteristic of a some injection molding machine. It is a figure explaining embodiment which acquires response data from a plurality of injection molding machines, calculates frequency characteristic data, and memorizes it. It is a figure explaining embodiment which acquires response data from a some injection molding machine, memorize | stores response data, and calculates frequency characteristic data. It is a figure explaining the process which concerns on this invention corresponding to embodiment using a deviation with an average frequency characteristic. It is a figure explaining the process which concerns on this invention corresponding to embodiment using the deviation with the frequency characteristic used as a reference | standard.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each embodiment, the same reference numerals are used for the same or similar configurations.
FIG. 1 is a diagram for explaining Embodiment 1 of the present invention. A system is constructed by connecting the centralized management apparatus 2 and a plurality of injection molding machines 10 ₁ , 10 ₂ ,..., 10 _N via the LAN 8. The system includes a plurality of injection molding machines 10 ₁ , 10 ₂ , 10 ₃ ,..., 10 _N connected via a network such as LAN 8, each of the injection molding machines 10 ₁ , 10 ₂ , 10 ₃ ,. ... Centrally manages the frequency characteristics of 10 _N movable parts by the centralized management device 2. In addition to the LAN, when connecting to a remote place such as outside the factory, the connection may be made via a network such as the Internet.

The centralized management device 2 is a device having a function of receiving and receiving information with an external device, an arithmetic processing function, a storage function, and a display function, such as a personal computer. The central control device 2, the injection molding machine _{10 1, 10 2, 10 3} , ···, 10 N has a frequency characteristic data acquiring unit 6 to obtain frequency characteristics data of the movable portion of the obtained frequency characteristic data Is stored for each injection molding machine. The frequency characteristics of the movable part include gain characteristics and phase characteristics. FIG. 2 shows gain characteristics (see FIG. 2A) for each of a plurality of injection molding machines 10 ₁ , 10 ₂ ,..., 10 _N stored in the frequency characteristic data storage unit 4 of the centralized management device 2. It is an example of the data of a phase characteristic (refer FIG.2 (b)). The frequency characteristic data in the present invention includes at least gain characteristic data for each frequency or phase characteristic data for each frequency. Further, the acquired frequency characteristic data may be displayed on a display screen of a display device provided in the central management device 2.

  The frequency characteristic of the movable part of the injection molding machine is at least one of a position loop frequency characteristic, a speed loop frequency characteristic, a current loop frequency characteristic, and a pressure loop frequency characteristic. By managing the frequency characteristics of the position loop, the speed loop, and the current loop, it is possible to manage changes in characteristics and deterioration of the drive unit and mechanism unit of the movable unit. Further, when the movable part is a screw shaft, pressure control is performed by moving the movable part forward or backward, so that the frequency characteristic of the pressure loop can be measured in addition to the frequency characteristic of the position loop, speed loop, and current loop. By managing the frequency characteristics of the pressure loop, it is possible to manage changes in characteristics or deterioration of the pressure detector or screw mechanism, or changes in the characteristics of the resin.

  Devices and methods for measuring these frequency characteristics are well known, and each frequency characteristic is measured by sweeping the frequency while superimposing a sinusoidal disturbance signal on the command value of each loop, and then applying the superimposed disturbance. A method for obtaining a response to the above, a method for superposing white noise on a command value of each loop, and a method for obtaining a response to the superimposed white noise are well known.

FIG. 3 is a diagram illustrating Embodiment 2 of the present invention. The central control device 2, the injection molding machine _{10 1, 10 2, 10 3} , ···, 10 N response data required to calculate the frequency characteristic of the movable portion, i.e., superimposed on a command value of each loop A response data acquisition unit 7 for acquiring a sine wave disturbance signal and response data for the superimposed disturbance, or white noise superimposed on a command value of each loop and response data for the superimposed white noise. It has the frequency characteristic calculation part 9 which calculates the frequency characteristic of a movable part from response data, and has the frequency characteristic data storage part 4 which memorize | stores the calculated frequency characteristic data for every injection molding machine.

FIG. 4 is a diagram illustrating Embodiment 3 of the present invention. The central control device 2, the injection molding machine _{10 1, 10 2, 10 3} , ···, 10 N response data required to calculate the frequency characteristic of the movable portion, i.e., superimposed on a command value of each loop A response data acquisition unit 7 for acquiring a sine wave disturbance signal and response data for the superimposed disturbance, or white noise superimposed on a command value of each loop and response data for the superimposed white noise. It has the response data storage part 5 which memorize | stores response data for every injection molding machine, and has the frequency characteristic calculation part 9 which calculates the frequency characteristic of a movable part from the memorize | stored response data.

Here, the movable part of the injection molding machine will be described. The movable parts of each of the injection molding machines 10 ₁ , 10 ₂ , 10 ₃ ,..., 10 _N are an injection shaft, a screw rotation shaft, an ejector shaft, a mold opening / closing shaft, and the like. There is a motor etc. as a drive part of a movable part. Moreover, there are a timing belt, a coupling, a ball screw, a toggle link, a transmission (gear box) and the like as a power transmission device of the movable part. By managing the frequency characteristics of the movable parts of each of the injection molding machines 10 ₁ , 10 ₂ , 10 ₃ ,..., 10 _N , it is possible to detect characteristic changes and deterioration of these movable parts. Further, when the movable part is an injection shaft, it is possible to detect a change in the characteristics of the pressure detection device and the resin in addition to the power transmission device.

The centralized management device 2 stores frequency characteristic data of a plurality of connected injection molding machines 10 ₁ , 10 ₂ , 10 ₃ ,..., 10 _N of a display device (not shown) provided in the centralized management device 2. to compare with the screen, the injection molding machine 10 _1, 10 _2, 10 _3, ..., 10 the maximum value of the frequency characteristic data of the _N, minimum, average, by calculating the standard deviation, etc. value by comparison, injection molding machine 10 _1, 10 _2, 10 _3, ..., it is possible to efficiently analyze the differences in characteristics between 10 _N.

Also, the central control device 2, the injection molding machine 10 _1, 10 _2, 10 _3, ..., the frequency characteristic data of 10 _N, and calculates an average frequency characteristic of the plurality of injection molding machines, the average The frequency characteristic deviation of each injection molding machine 10 ₁ , 10 ₂ , 10 ₃ ,..., 10 _N is calculated for a specific frequency characteristic, and an alarm is output when the deviation exceeds a threshold value. Good. The average frequency characteristic is obtained by calculating an average value of gain values and phase values of a plurality of injection molding machines 10 ₁ , 10 ₂ , 10 ₃ ,..., 10 _N for each frequency. (See FIG. 2). The average frequency characteristic is calculated using the frequency characteristic data of some or all of the injection molding machines 10 ₁ , 10 ₂ , 10 ₃ ,..., 10 _N.

  For example, if the gain characteristic in the position control band of a certain injection molding machine is lower than the average gain characteristic or the phase characteristic is delayed from the average phase characteristic, the position loop control characteristic may be degraded. Therefore, an alarm may be generated to prompt maintenance. Also, if the gain characteristic near the natural frequency of the movable part of an injection molding machine is higher than the average gain characteristic, resonance may have occurred near the natural frequency of the movable part. It may occur and prompt maintenance.

As for the calculation of the average frequency characteristic, for example, the average frequency characteristic of all injection molding machines 10 ₁ , 10 ₂ , 10 ₃ ,..., 10 _N connected to a network such as LAN 8 is calculated. Alternatively, all the injection molding machines connected to the network may be classified by model, and an average frequency characteristic for each model may be calculated. The alarm may be displayed on the screen on the display device of the centralized management device 2 so that it can be known which of the connected injection molding machines has an abnormality in the frequency characteristics. An abnormality has occurred in the output device such as a screen of a display device (not shown) or an alarm lamp provided in the injection molding machine in which the abnormality has occurred. You may make it understand. Further, the alarm may be notified from the centralized management apparatus 2 to an operator or an administrator by communication means such as mail.

FIG. 5 is a diagram for explaining processing according to the present invention corresponding to an embodiment using an average frequency characteristic. Hereinafter, it demonstrates according to each step.
[Step SA01] Obtain frequency characteristic data (gain characteristic and phase characteristic) of N injection molding machines connected to the network.
[Step SA02] Average frequency characteristics (gain characteristics and phase characteristics) of N injection molding machines are calculated.
[Step SA03] i is initialized to 1.
[Step SA04] A deviation (gain characteristic deviation: Gerr, phase characteristic deviation: Perr) between the frequency characteristic and the average frequency characteristic of the i-th injection molding machine is calculated.
[Step SA05] It is determined whether | Gerr | is greater than the gain threshold value. If it is larger, the process proceeds to Step SA07, and if not greater, the process proceeds to Step SA06.
[Step SA06] It is determined whether or not | Perr | is larger than the phase threshold value. If it is larger, the process proceeds to Step SA07, and if not larger, the process proceeds to Step SA08.
[Step SA07] An alarm is output to the i-th injection molding machine, and the process proceeds to Step SA08.
[Step SA08] A value obtained by adding 1 to i is newly set as i.
[Step SA09] It is determined whether i is larger than N. If i is larger, the process ends. If not larger, the process returns to step SA04 to continue the process.

In the above embodiment, the abnormality is determined based on the deviation from the average frequency characteristic of the plurality of injection molding machines 10 ₁ , 10 ₂ , 10 ₃ ,..., 10 _N. 10 ₁ , 10 ₂ , 10 ₃ ,..., 10 _N as reference frequency characteristics are acquired, then the current frequency characteristics are measured, and the deviation of the current frequency characteristics from the reference frequency characteristics is determined. An embodiment may be employed in which an alarm is output when the deviation exceeds a threshold value.

In this case, the frequency characteristic as a reference, each injection molding machine 10 ₁ at a certain point in time, 10 _2, 10 _3, ..., to store in the central control device 2 as a frequency characteristic as a reference frequency characteristics of 10 _N it may be, each injection molding machine 10 _1, 10 _2, 10 _3, · · ·, 10 _N of the storage unit (not shown) each injection molding machine 10 ₁ frequency characteristic serving as a reference which is stored in the , 10 ₂ , 10 ₃ ,..., 10 _N.

FIG. 6 is a diagram for explaining processing according to the present invention corresponding to an embodiment using a deviation from a reference frequency characteristic. Hereinafter, it demonstrates according to each step.
[Step SB01] Reference frequency characteristic data (gain characteristic, phase characteristic) is acquired for each of the N injection molding machines connected to the network.
[Step SB02] i is initialized to 1.
[Step SB03] The deviation (gain characteristic deviation: Gerr, phase characteristic deviation: Perr) between the frequency characteristic of the i-th injection molding machine and the reference frequency characteristic is calculated.
[Step SB04] It is determined whether or not | Gerr | is larger than the gain threshold value. If it is larger, the process proceeds to Step SB06, and if not larger, the process proceeds to Step SB05.
[Step SB05] It is determined whether or not | Perr | is greater than the phase threshold. If it is larger, the process proceeds to Step SB06, and if not greater, the process proceeds to Step SB07.
[Step SB06] An alarm is output to the i-th injection molding machine.
[Step SB07] Add 1 to i to newly set i.
[Step SB08] It is determined whether i is larger than N. If i is larger, the process ends. If not larger, the process returns to step SB03 to continue the process.

  Step SA01 and step SB01 described above are described in the case of the first embodiment, but in the case of the second embodiment, frequency characteristics are calculated from response data acquired from N injection molding machines connected to the network. In the case of the third embodiment, frequency characteristics are calculated from response data acquired and stored from N injection molding machines connected to the network.

  Further, as an embodiment of the present invention, the centralized management device 2 has a measurement command unit that commands the measurement of frequency characteristic data to an injection molding machine connected to the network, and the measurement command unit is an operation time of each injection molding machine, Cumulative number of shots of each injection molding machine, start or completion of production of each injection molding machine, change of molding conditions of each injection molding machine, elapse of a predetermined maintenance time in the centralized management device 2, and any operator instruction to the centralized management device 2 Based on these conditions, a frequency characteristic data measurement command may be output to an injection molding machine connected to the network.

  For example, when managing a movable part whose characteristics change according to the operating time of the injection molding machine or the cumulative number of shots, the operating time of each injection molding machine or the cumulative number of shots or the cumulative value of the load of the movable part is a predetermined value. When the frequency reaches the value, a measurement command for frequency characteristic data may be output. Alternatively, the injection molding machine determines whether the operating time of the injection molding machine, the cumulative number of shots, or the cumulative value of the load of the moving part has reached a predetermined value, and the injection molding machine measures the frequency characteristics and measures The frequency characteristic data may be output from the injection molding machine to the central control device. Here, the load of the movable part may be, for example, a time integral value of the driving force of the movable part, or an integral value of the position of the movable part of the driving force of the movable part, or a time integral value of the force received by the movable part, Or it is good also as an integral value regarding the position of the movable part of the force which a movable part receives. When managing frequency characteristic data according to the molded product and molding conditions of each injection molding machine, a measurement command for frequency characteristic data may be output when production is started or completed, or when molding conditions are changed. At this time, the operation time of the injection molding machine, the cumulative number of shots, the production start or completion signal, the molding condition change signal, and the like are acquired from each injection molding machine. Further, when the frequency characteristic data is managed in a predetermined cycle collectively in the entire injection molding machine factory, a frequency characteristic data measurement command may be output when a predetermined maintenance time elapses in the management device.

As described above, the embodiment of the present invention concentrates the frequency characteristics of the plurality of injection molding machines 10 ₁ , 10 ₂ ,..., 10 _N connected via a network such as the LAN 8 by the centralized management device 2. By managing it, it is possible to efficiently grasp the characteristics of the resin and the moving parts of the plurality of injection molding machines 10 ₁ , 10 ₂ ,..., 10 _N , and centralize management when abnormalities are found in the characteristics. The apparatus 2 can easily confirm the abnormality.

2 Centralized management device 4 Frequency characteristic data storage unit 5 Response data storage unit 6 Frequency characteristic data acquisition unit 7 Response data acquisition unit 8 LAN
9 Frequency characteristic calculator 10 ₁ 1st injection molding machine 10 ₂ 2nd injection molding machine 10 ₃ 3rd injection molding machine 10 _N Nth injection molding machine

Claims (5)

An injection molding machine management device that centrally manages a plurality of injection molding machines connected by a network,
A response data acquisition unit for acquiring response data required for calculation of frequency characteristic data when driving the movable part of the injection molding machine from the plurality of injection molding machines ;
A frequency characteristic data calculation unit for calculating the frequency characteristic data of the movable part from the acquired response data;
A storage unit for storing the calculated frequency characteristic data for each injection molding machine;
Have
Among the plurality of injection molding machines, an average frequency characteristic calculation unit that calculates average frequency characteristic data from the frequency characteristic data of some or all of the injection molding machines,
A deviation calculating unit that calculates a deviation of the frequency characteristic data of each injection molding machine with respect to the average frequency characteristic data, and an alarm output unit that outputs an alarm when the calculated deviation of the frequency characteristic data exceeds a threshold value And a control device for an injection molding machine. An injection molding machine management device that centrally manages a plurality of injection molding machines connected by a network,
A response data acquisition unit for acquiring response data required for calculation of frequency characteristic data when driving the movable part of the injection molding machine from the plurality of injection molding machines;
A storage unit for storing the acquired response data for each injection molding machine;
A frequency characteristic calculation section for calculating the frequency characteristic data of the movable portion from the response data said memory,
Have
Among the plurality of injection molding machines, an average frequency characteristic calculation unit that calculates average frequency characteristic data from the frequency characteristic data of some or all of the injection molding machines,
A deviation calculating unit that calculates a deviation of the frequency characteristic of each injection molding machine with respect to the average frequency characteristic data, and an alarm output unit that outputs an alarm when the calculated frequency characteristic deviation exceeds a threshold value A management apparatus for an injection molding machine, comprising: The frequency characteristic data when the movable part is driven is at least one of position loop frequency characteristic data, speed loop frequency characteristic data, current loop frequency characteristic data, and pressure loop frequency characteristic data of the movable part. The management apparatus of the injection molding machine as described in any one of Claim 1 or 2 . Operating time of each injection molding machine, cumulative number of shots of each injection molding machine, cumulative load of movable parts of each injection molding machine, start or completion of production of each injection molding machine, change of molding conditions of each injection molding machine, predetermined maintenance 2. A measurement command unit that outputs a measurement command of response data to an injection molding machine connected to a network based on any condition of time elapse and an operator's instruction to the management device . The management apparatus for an injection molding machine according to any one of 3. The management apparatus for an injection molding machine according to any one of claims 1 to 4 , further comprising a display unit that displays the frequency characteristic data .

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