JP3231468B2 - Monitor for injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor for an injection molding machine.

[0002]

2. Description of the Related Art A control device of an injection molding machine has been proposed which samples back pressure and screw rotation speed values which change in a weighing and kneading process in accordance with a screw position and displays a graph of the change curve on a display screen. It is known. However, only by referring to such a change curve, it is only possible to qualitatively know the relationship between the back pressure, the screw rotation speed and the screw position, and it is not possible to obtain exact quantitative data. In addition, even if the values of the back pressure and the screw rotation speed are actually measured based only on the screw position, various data cannot be detected in relation to the time factor. And various data related to the plasticization phenomenon of the resin cannot always be known easily.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art and to more accurately determine the values of various variables related to the plasticization phenomenon of a resin at the time of metering and kneading and the characteristics of the variables. An object of the present invention is to provide a monitoring device of an injection molding machine that can be grasped.

[0004]

According to the present invention, there is provided a monitoring device for an injection molding machine, comprising: a sampling means for detecting and storing a variable which changes in a weighing and kneading process at predetermined intervals;
Graph display means for graphically displaying the transition of the variable obtained by the sampling means on a display screen,
The type of the variable displayed on the display screen is
First input means for inputting, and the first input means specified by the first input means.
Specify either the maximum or minimum value of the
2 input means and for obtaining said maximum or minimum value
Section assigning means for giving the section of the above, said first input means,
Specify based on the second input means and the section providing means
Position on the graph corresponding to the maximum or minimum value
Means for determining the position and the position at the position on the determined graph.
The above object is attained by a configuration characterized by comprising: display control means for numerically displaying the values of one or more variables among the various variables on the display screen.

[0005] Further , the second input means also indicates an average value.
When the average value is designated, the section assigning means
Specified by the first input means in the section given by
Means for obtaining an average value of the variables, wherein the display control means
Is a straight line on the display screen
Is now displayed as a graph.

[0006] In addition, various types of materials that change during the weighing and kneading process.
Sampling method that detects and stores the variable of
And the various types of the various types obtained by the sampling means.
Graph that displays the transition of variables on the display screen
Display means, the display screen displayed on the display screen
First input means for inputting the type of the variable;
Second input means for inputting numerical data for specifying the position
A step, based on the first input means and the second input means;
The group corresponding to the numerical data of the variable
Means for finding a position on the rough, and the position on the found graph
The values of one or more of the various variables in
Display control means for displaying numerical values on the display screen.
And a position corresponding to the input numerical data is determined.
Displays the value of one or more variables corresponding to this position
Caught. Also, a next candidate key is provided, and the next candidate key is operated.
Position on the graph corresponding to the input numerical data
Also asked.

The types of the variables are screw position, weighing
Motor torque, screw rotation speed, motor
Output, screw retreat speed, or back pressure.

[0008] The display control means may include a position on the graph.
By using the cursor on the display screen.
Clearly understand the relationship between the graphical display and the numerical data
I made it possible.

[0009]

The sampling means detects the values of various variables that change in the weighing and kneading process at predetermined intervals, and stores these variables in association with the elapsed time of sampling. The graph display means graphically displays the transition of the variable acquired by the sampling means on the display screen in association with the elapsed time of sampling or the change of the screw position which is a univariate.

[0010] Know the maximum or minimum value of the variable of a specific item
If you want, specify the type of variable and the maximum or minimum value
When the section is designated by the section assigning means, the designated
The maximum or minimum value in a specified interval
The corresponding position is determined, and one of various variables at this position is determined.
Numerical values of more than two kinds of variables are displayed. Also, the position on the graph
Select when numeric data for specifying the position is input
Find the position of the variable on the graph corresponding to the numerical data
Of the various variables at the position on the graph obtained.
The values of one or more variables are displayed on the display screen.
Display value.

[0011] The display control means, and displays the cursor position on the specific and graph, the values of various variables corresponding to the position numerical display on a display screen, also displayed a mean value is designated when the further display the position of the specific average value in a straight line on the display screen.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a main part of an injection molding machine according to one embodiment to which a monitor device of the present invention is applied. Reference numeral 1 denotes an injection cylinder of the injection molding machine, and reference numeral 2 denotes a screw. The screw 2 is driven in the injection axis direction by an injection servomotor M1 via a drive converter 5 for converting the rotation of the drive source shaft into a linear motion in the injection axis direction.
And is rotated by the screw rotation servomotor M2. A pressure detector 4 is provided at the base of the screw 2, and detects a resin pressure acting in the axial direction of the screw 2, that is, an injection holding pressure in the injection holding pressure step and a screw back pressure in the metering and kneading step. The injection servomotor M1 is provided with a pulse coder P1 for detecting the position and moving speed of the screw 2, and the screw rotation servomotor M2 is provided with a pulse coder P2 for detecting the rotation speed of the screw 2.
Has been deployed.

A control device 10 also serving as a monitor device of the injection molding machine includes a CNC which is a microprocessor for numerical control.
CPU 25, a PMC CPU 18 serving as a microprocessor for a programmable machine controller, a servo CPU 20 serving as a servo control microprocessor, and a pressure monitoring CPU 17 for performing a sampling process of an injection holding pressure and a screw back pressure. Bus 22
The information can be transmitted between the microprocessors by selecting mutual input and output via the microprocessor.

The CPU 18 for the PMC is connected to a ROM 13 for storing a sequence program for controlling a sequence operation of the injection molding machine and a RAM 14 for temporarily storing operation data. On the other hand, CNC CPU
The ROM 25 is connected to a ROM 27 storing a program for controlling the entire injection molding machine and the like, and a RAM 28 used for temporarily storing calculation data.

In each of the servo CPU 20 and the pressure monitoring CPU 17, a ROM 21 storing a control program dedicated to servo control, a RAM 19 used for temporarily storing data, and a control program relating to a sampling process of molding data and the like are stored. ROM 11 and a RAM 12 used for temporary storage of data are connected. Further, the servo CPU 20 is connected to a servo amplifier 15 for driving servomotors of respective axes for mold clamping, ejector (not shown), injection, screw rotation, etc., based on instructions from the CPU 20. Each of the outputs from the pulse coder P1 provided for the injection servomotor M1 and the pulse coder P2 provided for the screw rotation servomotor M2 is fed back to the servo CPU 20, and the screw calculated by the servo CPU 20 based on the feedback pulse from the pulse coder P1. 2 and the feedback pulse from the F / V-converted pulse coder P2, that is, the rotation speed of the screw 2, is stored in each of the current position storage register and the current speed storage register of the memory 20.

The non-volatile memory 24 is a memory for storing molding data (injection holding pressure conditions, metering and kneading conditions, etc.) and various set values, parameters, macro variables, etc. relating to the injection molding operation.

The pressure monitor CPU 17 repeatedly executes the sampling process for each of the injection pressure-holding step and the metering and kneading step, and applies the pressure to the screw 2 via the pressure detector 4 and the A / D converter 16 every predetermined sampling period. In addition to detecting the injection holding pressure or screw back pressure that acts, the current position of the screw 2 is read from the current position storage register of the memory 19 to determine the screw position at the time of sampling in the previous cycle and the screw position at the time of sampling in the current cycle. The current injection speed or screw retreat speed (mm / s) is determined based on the current value of the injection holding pressure or the screw back pressure (Kg / cm ² ), the current position of screw 2 (mm), the injection speed or the screw retreat. The current value of the speed, and in the metering kneading process, via a pulse coder P2 or the like Screw rotation speed to be issued (rp
m), the driving torque (Kg · cm) corresponding to the driving current of the screw rotation servomotor M2, and the value of the driving torque (Kg · cm) and the screw rotation speed (rpm) 1.635 × 10 ^−6. × drive torque (Kg · c
m) × The value of the motor output (Kw) of the servomotor M2 for screw rotation obtained by the formula of screw rotation speed (rpm) as a variable, corresponding to the sampling cycle, for each of the injection holding pressure step and the metering and kneading step. The data is updated and stored in the RAM 12.

RAM constituting a part of sampling means
12 is the current value of the injection holding pressure or screw back pressure, screw position, injection speed or screw retreat speed,
A file for writing each variable of the motor output of the screw rotation servomotor M2, the screw rotation speed, and the driving torque of the screw rotation servomotor M2 in time series in synchronization with the sampling cycle; It has a file for storing sampling data of the variables detected in the weighing and kneading process (both refer to FIG. 2), and data can be written up to now every time one injection holding pressure process and weighing and kneading process are completed. A pointer for storing the sampling data is set for the file that has been set, while a pointer for storing the current value is set for the other file,
In the next injection holding pressure step and the weighing and kneading step, variable sampling data is written to the file on which the pointer for storing the current value is set. That is, each time the injection holding pressure step and the metering and kneading step are completed, the sampling data of the variable is alternately written to the two files. Hereinafter, the file on which the sampling data storage pointer is set at that time is called a sampling data storage file, and the file on which the current value storage pointer is set is the current value storage file. Call.

In each file, a storage area for storing the sampling data of the variables in the injection and pressure holding step and a storage area for storing the sampling data of the variables in the weighing and kneading step are, for example, the storage areas for the variables in the weighing and kneading step. The storage area for storing the sampling data is from address 0 to address N0, and the storage area for storing the variable sampling data of the injection and pressure holding process is from address N1 to address N2.
(However, 0 <N0 <N1 <N2), and the address 0 is input when the weighing start signal is input.
The writing of the variable sampling data is started with the storage area at the initial position, and the writing of the variable sampling data with the storage area at the address N1 as the initial position is started when the injection start signal is input. Among them, the sampling data of the variable stored in the storage area from the address N1 to the address N2 is data used in the monitor display process related to the injection pressure-holding process. Has already been proposed by the present applicant, etc., and is not intended by the present invention. Therefore, here, the sampling process and the sampling data in the weighing and kneading process according to the present invention are monitored in the injection holding pressure process. Only the fact that it does not interfere with the display processing and the like will be clarified, and the description of the monitoring processing and the like in other processes will be omitted.

The interface 23 is an input / output interface for receiving signals from limit switches and operation panels provided in various parts of the injection molding machine and transmitting various commands to peripheral devices of the injection molding machine.

Then, the CNC CPU 25 stores the ROM 27
The servo CPU 20 performs pulse distribution for the servomotors of the respective axes based on the control program of the above. The servo CPU 20 performs the pulse-dispersed movement commands for the respective axes and the feedback signal of the position detected by the detector such as the pulse coder P1, P2. Based on the feedback signal of speed and speed, servo control such as position loop control, speed loop control, and current loop control is performed in the same manner as in the related art, and so-called digital servo processing is executed.

The manual data input device 29 with a display, which forms part of the graph display means and the position designation means,
It is connected to the bus 22 via a CRT display circuit 26 which constitutes a part of the display control means, so that a monitor display screen and a function menu can be selected and various data input operations can be performed. Ten keys and various function keys are provided.

FIGS. 3 and 4 show the CMC for the PMC in a state in which the function menu of the monitor display relating to the weighing and kneading process is selected by operating the function keys of the manual data input device 29.
A flowchart showing an outline of the monitor display process performed by the PU 18, and FIGS. 5 to 14 are flowcharts for explaining main processes in the monitor display process. Hereinafter, the present embodiment will be described with reference to these flowcharts. The processing operation of the monitor device in will be described.
At the stage when the function menu of the monitor display is selected, it is assumed that a continuous molding operation for setting conditions or molding a product has already been started.

When the PMC CPU 18 detects the operator's selection operation on the function menu of the monitor display, it first changes the function assignment of the function keys in the manual data input device 29 and displays a guidance message corresponding to the use of each function key. It is displayed in the display area A of the screen (see FIG. 15), and the display of the entire screen except the guidance message and the like is once cleared. It is determined whether or not it is set (step S1).

If the flag F is not set, the elapsed time of sampling is plotted on the horizontal axis, the driving torque T of the screw rotation servomotor M2, the screw rotation speed R, and the output H of the screw rotation servomotor M2. , A screw-backing speed V, a screw back pressure P, and a screw-position S on the vertical axis are displayed in a display area B on the display screen. Further, the screw rotation speed and the screw back pressure as the weighing and kneading conditions are displayed. Only when each set value is set on a time basis, each set state of the screw rotation speed and the screw back pressure is graphically displayed on the display area B in correspondence with the horizontal axis, and each stage of the weighing and kneading is performed. Is displayed numerically in the display area C (step S2, example in FIG. 15). When it is determined that the flag F is set, the screw position is plotted on the horizontal axis, and the driving torque T, rotation speed R, output H, reverse speed V, and back pressure P are plotted on the vertical axis. A display frame is displayed in the display area B, and only when the respective set values of the screw rotation speed and the screw back pressure as the weighing and kneading conditions are set on the basis of the screw position, the screw rotation speed and the screw back pressure are set. The respective setting states are graphically displayed on the display area B corresponding to the horizontal axis, and the switching screw positions of the respective stages of the metering and kneading are numerically displayed on the display area C (step S3).

Next, the PMC CPU 18 determines whether or not the operator has performed a selection operation relating to another function menu, that is, terminates the monitor output in response to the operation of the function key Fa (hereinafter, referred to as a screen switching key). It is determined whether or not a command has been input (step S
4). If no other selection operation has been performed, PMC C
The PU 18 determines whether or not the function key Fb (hereinafter, referred to as a data search key) is operated (step S5), and if the data search key is not operated,
Further, it is determined whether or not a function key Fc (hereinafter, referred to as a horizontal axis switching key) is operated (step S).
11).

When the horizontal axis switching key is operated, the PMC CPU 18 inverts the axis selection state storage flag F (step S12), and repeats the same processing again according to the state of the flag F. , The display frame of the graph and the like are displayed again (steps S1 to S3).

If the horizontal axis switching key has not been operated, a selection operation relating to another function menu is performed, or until the data search key is operated.
The PMC CPU 18 determines in step S4, step S5,
The determination process of step S11 and the normal process shown in step S13 are repeatedly executed.

The normal processing shown in step S13 relates to the detection and display of various variables, and the processing itself is equivalent to the graph display processing conventionally performed only in the injection pressure-holding step. In this embodiment, the CPU for pressure monitoring
Reference numeral 17 denotes a current value of the back pressure acting on the screw 2 (injection holding pressure in the injection holding pressure step), which repeatedly executes the sampling process for each processing loop also in the metering and kneading process.
And the current position of the screw 2 is detected, and the current screw retreat speed (which is the injection speed in the injection pressure-holding step) is obtained from the relationship between the screw position in the previous cycle and the current cycle (the above is substantially the same as in the injection pressure-holding step). Similar to the process), and further detects the screw rotation speed via a pulse coder P2 or the like,
The drive current of the servo motor M2 is detected by detecting the drive current of the servo motor M2 for screw rotation, and the motor output of the servo motor M2 for screw rotation is calculated by the above equation based on the drive torque and the value of the screw rotation speed. (The above is only the weighing and kneading process), and the variables of the driving torque of the screw rotation servomotor M2, the screw rotation speed, and the output of the screw rotation servomotor M2 are changed to the screw retreat speed, the screw back pressure, and the screw position. At the same time, the data is written in the current value storage file of the RAM 12 in correspondence with the sampling period, and the sampling data one molding cycle before is held in the sampling data storage file. Then, the PMC CPU 18 reads the data of the sampling data storage file, and sets the elapsed time of sampling or the screw position on the horizontal axis in accordance with the reset or set state of the axis selection state storage flag F,
Back pressure value corresponding to each sampling cycle, screw position (coincides with the horizontal axis if the screw position is selected on the horizontal axis), screw retreat speed value, output value of servo motor M2, screw rotation speed value, The value of the driving torque of the servo motor M2 is sequentially plotted on a display screen, and a graph is displayed. Regarding the method of displaying graphs, there are cases where the display state of the graph created in the previous molding cycle is retained as it is and a new graph is overlaid, or the graph display is erased every time one molding cycle is completed. In some cases, only the graph of the one-meter kneading process is displayed. However, these processes are the same as the normal function of the conventional high-speed monitor device that performs the graph display in the injection holding pressure process, and thus will not be described.

The operation of the horizontal axis switching key can be performed even while the loop processing consisting of step S4, step S5, and step S13 is repeatedly executed. The display of the graph excluding the guidance message and the like is temporarily cleared, and a new graph display is started in accordance with the state of the axis selection state storage flag F.

When it is necessary to acquire numerical data from the graph while such monitor display is repeatedly executed, for example, the detailed numerical data of the molding conditions determined by setting the conditions is extracted and stored. To check the operation state of the injection molding machine during the continuous operation after the completion of the condition setting, the operator first operates the data search key to operate the PMC CPU 1.
8 starts the processing in the search mode.

The PMC CPU 18 that has detected the operation of the data search key by the determination processing in step S5 holds the value of the sampling data for the one metering kneading process currently stored in the sampling data storage file in the RAM 12 at the present time. Then, the graph display is fixed (step S6).

Then, the PM that has started the search mode processing
The CPU 18 for C determines the value of the axis selection state storage flag F (step S7), and if the elapsed time of sampling is selected as the horizontal axis serving as a reference for graph display, based on the current value of the address search index i. Then, the cursor is moved to and displayed at the position of i · Δt on the horizontal axis (where Δt is a sampling period) (step S8). If the screw position is selected as the horizontal axis, the position of Si on the horizontal axis is changed. Location, ie
The cursor is moved to and displayed at the position of the screw position Si stored at the address i of the sampling data storage file (step S9), and the value of the variable corresponding to the cursor position, that is, the address i of the sampling data storage file, is displayed. The stored drive torque Ti, rotation speed Ri, motor output Hi, screw retreat speed Vi, back pressure Pi, screw position Si, and the elapsed time i · Δt after the start of the weighing and kneading process are numerically displayed in a display area D. (Step S10).

Next, the PMC CPU 18 designates function keys Fe, Ff (hereinafter, cursor right movement keys, Five function keys constituting a first input means for selecting and inputting a search item, that is, a function key Fg (hereinafter referred to as a torque key) for selecting a driving torque as a search item. ),
A function key Fh (hereinafter referred to as a rotation speed key) for selecting a screw rotation speed as a search item,
Function key Fi (hereinafter referred to as motor output key) for selecting a motor output as a search item, function key Fj (hereinafter referred to as a reverse speed key) for selecting a screw retreat speed as a search item, and a screw back as a search item. Function key Fk for selecting pressure (hereinafter referred to as back pressure key), function key F for selecting screw position as a search item
d (hereinafter referred to as a screw position key) or a function key Fl (hereinafter referred to as a search end key) for temporarily terminating a search mode process relating to the extraction of numerical data and returning to a normal sampling and graph display mode. Until one of the keys is operated,
The determination process of steps S14 to S22 is repeatedly executed, and the key operation by the operator is waited.

First, when the cursor rightward movement key for performing a position designation operation by designating an arbitrary position on the graph with the cursor is operated, the PMC CPU 18 which has detected this operation in the determination processing of step S14, The process of SUB1 shown in FIG. 5 is executed in order to move the cursor to the right along the horizontal axis serving as a reference for display and numerically display the variable data corresponding to the current cursor position.

PMC CPU shifted to SUB1 processing
18, first, the value of the address search index i is incremented (step A1), and it is determined whether or not the value of the index i exceeds the last address n of the stored area in the sampling data saving file (step A2). If the value of the index i exceeds the value of n, the value of n is reset to the index i (step A3). If the value of i does not exceed the value of n, the value of the index i is changed. Hold as it is.

Note that the initial value of the index i is 0, but if any processing relating to the cursor movement has already been performed one or more times, the address search index i is executed in the immediately preceding processing.
Is the initial value of the index i in step A1. The final address n is a variable indicating the final address of the sampling data for one weighing and kneading process stored in the sampling data storage file (see FIG. 2), and its magnitude is the time required for the one weighing and kneading process. That is, it depends on the number of times of execution of sampling (however, n ≦ N0, where N0 is set to allow the longest mixing time).

Next, the PMC CPU 18 proceeds to step S.
7, the value of the axis selection state storage flag F is determined, and based on the determination result, the process proceeds to step S
8 or the processing of steps S9 and S10 to move the display position of the cursor, and the data of various variables corresponding to the display position of the cursor, that is, the drive torque Ti stored at the address i of the sampling data storage file. , The rotation speed Ri, the motor output Hi, the screw retreat speed Vi, the back pressure Pi, the screw position Si, and the value of the elapsed time i · Δt after the start of the weighing and kneading process are numerically displayed in the display area D. The process shifts to a process, and waits for an operator's key operation by the determination process in steps S14 to S22. Therefore, if the operator continues to operate the cursor right movement key, the cursor continuously moves from left to right along the horizontal axis, and the display area D for displaying numerical data corresponds to the current cursor position. The value of each variable is updated and displayed successively. Step A in SUB1 as in this embodiment
In the case where the value of i is reset to n in the processing of step 3, the movement stops when the cursor moves to the right end of the graph, but the value of i is initialized to 0 in the processing of step A3. If the cursor is moved to the right end of the graph, the cursor automatically returns to the position of elapsed time 0 or the screw most advanced position again, and moves rightward as it is.

After moving the cursor to a desired position while viewing the graph, the operator stops the movement of the cursor by stopping the operation of the right cursor key, and displays various variable data values corresponding to the current cursor position from the display area D. read. Further, the driving torque Ti, the rotation speed Ri, the motor output Hi, and the screw retreat speed V displayed in the display area D.
Any of i, the back pressure Pi, the screw position Si, and the elapsed time i · Δt after the start of the weighing and kneading process is used as a key for variable data search, and a desired value, for example, a screw position at which the variable data is to be extracted is displayed. At this stage, the value of other variable data corresponding to this may be read.
That is, if any one of the variables of the drive torque, the rotation speed, the motor output, the screw retreat speed, the back pressure, the screw position, and the elapsed time after the start of the weighing and kneading process is known, the operation of only the cursor movement key can be performed. , Can be easily searched for other variables corresponding thereto.

On the other hand, when the cursor left movement key is operated, the PMC CPU 18 detects this operation in the discrimination processing in step S15, and moves the cursor to the left in the SUB2 processing shown in FIG. A process for displaying various variable data values corresponding to the current position in the numerical data display area D is executed. The processing of SUB2 for moving the cursor to the left includes a point at which the value of the address search index i is decremented (step B1) and a point at which the minimum value of the index i is limited to 0 (step B2 to step B).
Except for 3), the process is the same as the process of SUB1, and a detailed description thereof will be omitted.

If the torque key, which is the first input means for selecting a search item, is operated, the process proceeds to step S
The CPU 1 for the PMC that has detected this operation in the discrimination processing of No. 16.
8 sets 1 to the address search index j (step S
23), the process shifts to the process of step S28 shown in FIG. 7, and a guidance message for inputting the lower limit value of the data search is displayed in the display area E of the display screen.
The lower limit and the upper limit described later are set values for specifying the search area with respect to the horizontal axis of the graph display, that is, the elapsed time after the start of the weighing and kneading process or the screw position. It is not set for the search item itself selected by the function keys constituting the input means. The operator who referred to the guidance message for inputting the lower limit value further refers to the graph display in the display area B, and if the horizontal axis is displayed by time, sets the lower limit value of the data search via the numeric keypad of the manual data input device 29. Numerical values are input with the elapsed time after the start of the kneading and kneading process. If the horizontal axis is displayed at the screw position, the numerical lower limit value of the data search is numerically input at the screw position via the numeric keypad of the manual data input device 29. CPU 18 for PMC
Detects each time the operator inputs a numerical value with the numeric keypad (step S29), sequentially reads the input numerical value as a numerical sequence into the buffer of the manual data input device 29, and displays the value of the buffer in the display area E (step S29). Step S
30). When a function key Fm (hereinafter referred to as an input key) for defining data input is operated by the operator (step S31), the CPU for PMC
Numeral 18 stores the numerical value sequence of the buffer as setting data in the lower limit value storage register RB (step S32), and clears the storage content of the buffer of the manual data input device 29 and the display of the display area E (step S33).

Next, the PMC CPU 18 displays a guidance message in the display area E of the display screen to input the upper limit value of the data search (step S3).
4) As described above, the operator who referred to this message searches the data using the numeric keypad of the manual data input device 29 according to whether the graph display of the display area B is performed based on the time or the screw position. The upper limit value is input as the elapsed time after the start of the weighing and kneading process or the screw position. Then, the PMC CPU 18
As described above, every time the operator inputs a numerical value using the numeric keypad, this is detected and sequentially read into the buffer of the manual data input device 29, and this buffer data is displayed in the display area E.
Are sequentially displayed (steps S35 to S36).
Then, when the operator who has finished inputting the data operates the input key, the PMC CPU 18 detects this operation in the determination processing of step S37, and stores the numerical value sequence of the buffer in the upper limit value storage register RT as the setting data (step S38). ), Clear the contents of the buffer of the manual data input device 29 and the display of the display area E (step S3).
9).

Next, the PMC CPU 18 uses the second input means for designating the type of data for which numerical data is to be searched for the search item selected by the function key constituting the first input means, ie, the second input means. , A function key Fn for designating a maximum value (hereinafter, referred to as a maximum value key), a function key Fo for designating a minimum value (hereinafter, referred to as a minimum value key), and a function key Fp for designating an average value. (Hereinafter referred to as an average key) or any of a numeric keypad and an input key for performing a search operation by setting arbitrary numerical data for a search item selected by a function key constituting a first input means. Until that key is operated,
Step S40 to step S43 and step S45
Is repeatedly executed to wait for a key operation by the operator.

Here, when the maximum key is operated, the PMC CPU 18 which has detected this operation in the discriminating process of step S40 outputs the maximum value of the search item selected by the function key constituting the first input means. SUB3 shown in FIG. 9 is executed to search for. SUB
The PMC CPU 18 that has proceeded to the process of FIG. 3 first detects the elapsed time corresponding to the lower limit value and the upper limit value of the data search or the address of the sampling data storage file including the screw position data.
The processing of UB6 is performed. P shifted to SUB6 processing
The MC CPU 18 stores the value of the lower limit value RB set in the processing of step S32 in the comparison value storage register R0, initializes the value of the address search index i to 0 (step D1 to step D2), and selects the axis. The value of the state storage flag F is determined (step D3). If the value of the axis selection state storage flag F is 0 and time is selected as the horizontal axis, the PMC CPU 18 determines the elapsed time i corresponding to the address i of the sampling data storage file.
The value of Δt is obtained and stored in the comparison value storage register R1 (step D4). If the value of the axis selection state storage flag F is 1 and the screw position is selected as the horizontal axis, the PMC CPU 18 Reads the value Si of the screw position stored at the address i of the sampling data storage file, and stores this value in the comparison value storage register R1 (step D7). Next, the PMC CPU 18
Indicates whether the value of the register R1 has reached the value of the register R0, that is, the elapsed time i.multidot..DELTA.t corresponding to the address i of the file for storing sampling data rather than the elapsed time or the lower limit value set by the screw position. Alternatively, it is determined whether or not the screw position Si is larger (step D5). If the value corresponding to the address i of the sampling data storage file is smaller, that is, if the elapsed time of the address i or the screw position is smaller than the set lower limit, the PMC CPU 18 sets the address search index. The value of i is incremented (step D6), and the process returns to step D3.
In the same manner as described above, the processing of step D3 and step D4 or step D7 and step D5 to step D6 is repeatedly executed, and the elapsed time or the screw position R1 corresponding to the address stored in the sampling data storage file starts from the lower limit value. The value of the index i when the value exceeds the value of RB is detected (step D5).

Next, the PMC CPU 18 determines whether the value stored in the comparison target value storage register R0 matches the lower limit value RB, that is, whether the index i detected this time corresponds to the elapsed time or the screw position corresponding to the lower limit value. Is determined (step D8). Then, the value of the register R0 matches the lower limit value RB, and the index i detected this time is
Is determined to have the elapsed time or screw position corresponding to the lower limit, the PMC CPU 1
8 updates and stores the value of the index i indicating the address corresponding to the lower limit value in the lower limit value storage register RB in the register RB (step D9), and stores the value of the upper limit value RT set in the process of step S38 as a comparison value. The value is updated and stored in the register R0, the value of the address search index i is incremented (step D10, step D6), and the process returns to step D3. Thereafter, the same process as described above is repeatedly executed to save the sampling data. The value of the index i when the elapsed time of the application file or the screw position R1 exceeds the value of the upper limit RT for the first time is detected (step D5). Then, the PMC CPU 18 stores the comparison value storage register R0.
Is equal to or lower than the lower limit value RB,
It is determined whether or not the index i detected this time corresponds to the lower limit (step D8). In this case, R0 = R
Since it is T, the determination result in step D8 is false. Therefore, the PMC CPU 18 decrements the value of the index i, obtains the value of the address search index immediately before the elapsed time or screw position stored in the sampling data storage file exceeds the upper limit RT, and sets this value to the upper limit. Is updated and stored in the register RT as an index value indicating an address corresponding to the lower limit value storage register RB (step D11).
Is updated and stored in the address search index i as the initial value of the search start index (step D12).

CPU 1 for PMC after SUB6 processing
8 then returns to the processing of SUB3, stores the value i (= RB) of the address corresponding to the set lower limit of the search as the initial value in the maximum value corresponding address storage register k (step C1), and stores the index i The value of the driving torque Ti is read from the addresses of the i and j spots of the sampling data storage file corresponding to (i = 1 in step S23), and the value of the driving torque Ti is stored as an initial value in the maximum value storage register Rmax. (Step C2). Below, C for PMC
The PU 18 repeatedly executes a normal maximum value detection process as shown in Steps C3 to C7, i = RB to i =
The value k of the address corresponding to the driving torque which is the maximum in the section of RT is obtained, and this value is updated and stored in the address search index i (step C8).

Then, the PMC CPU 18 that has completed the processing of SUB3 proceeds to the processing of step S7, determines the value of the axis selection state storage flag F, and based on the determination result,
In the same manner as described above, the processing of step S8 or step S9 and step S10 is executed to move the cursor display position to the position of the maximum drive torque in the set section, and data of various variables corresponding to the cursor display position, that is, ,
The maximum value Ti of the driving torque and the screw rotation speed R stored at the address i of the sampling data storage file.
i, motor output Hi, screw retreat speed Vi, back pressure P
i, the screw position Si and the value of the elapsed time i · Δt after the start of the weighing and kneading process are numerically displayed in the display area D,
The process shifts again to the process of step S14,
~ Wait for the key operation of the operator by the determination processing of step S22.

When the minimum value key of the second input means for designating the type of data to be searched for numerical data is operated, the PMC CPU 18 detects this in the discrimination processing of step S41, In order to search for the minimum value of the search item selected by the function key constituting the first input means, the processing of SUB4 shown in FIG. 11 is executed. The process of SUB4 is a process for obtaining the address value k corresponding to the minimum drive torque in the section from i = RB to i = RT.
Except for the difference in the direction of the inequality sign in the processing of SUB3 (corresponding to step C5 in SUB3), the processing is exactly the same as the processing in SUB3 described above, and a description thereof will be omitted.

CPU 1 for PMC after SUB4 processing
8 shifts to the process of step S7, determines the value of the axis selection state storage flag F, and executes the process of step S8 or step S9 and step S10 in the same manner as described above, based on the determination result. Is moved to the position of the minimum drive torque in the set section, and the data of various variables corresponding to the cursor display position, that is, the minimum value Ti, of the drive torque stored at the address i of the sampling data storage file. The values of the screw rotation speed Ri, the motor output Hi, the screw retreat speed Vi, the back pressure Pi, the screw position Si, and the elapsed time i · Δt after the start of the weighing and kneading process are numerically displayed in the display area D, and then the process returns to step S14. The process shifts to a process, and waits for an operator's key operation by the determination process in steps S14 to S22.

When the average key of the second input means for designating the type of data to be searched for numerical data is operated, the PMC CPU 18 detects this in the discriminating process of step S42. In order to calculate the average value of the search items selected by the function keys constituting the first input means, the processing of SUB5 shown in FIG. 12 is executed. PMC CPU 18 shifted to SUB5 processing
First, in order to prevent meaningless movement of the cursor, the value of the index i indicating the current cursor position is stored in the register k (step G1), and the SUB6 process is executed similarly to the above to execute the index to be searched. Of the initial value RB and the final value RT of
The initial value RB of the search start is set to the address search index i. Next, the PMC CPU 18 reads the value of the driving torque Ti from the address of the i, j spot of the sampling data storage file corresponding to the index i (Step S).
23, j = 1), and stores this value in the integrated value storage register SUM.
(Step G2), and thereafter, the normal integration processing as shown in Step G3 to Step G5 is repeatedly executed to obtain the integrated value SUM of the driving torque Ti in the section of i = RB to i = RT. Then, this value is represented by i = RB to i =
The average value of the driving torque is obtained by dividing by RT-RB + 1, the number of samples of the data in the RT section, and is adjusted to the scale of the vertical axis of the item j (in this case, the driving torque T). SUM / (RT-
RB + 1) is displayed, the average value of the driving torque in the section of i = RB to i = RT is displayed in a graph, and the value S
UM / (RT-RB + 1) is numerically displayed in the display area E (step G6). Next, the PMC CPU 18 resets the value of the register k to the index i, completes the processing of SUB5 (step G7), shifts to the processing of step S14 again, and determines the key of the operator by the determination processing of steps S14 to S22. Wait for operation. Therefore, the cursor is not moved by operating the average key.

A numeric keypad as data input means for performing a search process by designating a numerical value to be searched for the item specified by the first input means for selecting a search item is operated. Then, the PMC CPU 18 sequentially detects this in the determination processing of step S43, sequentially reads the input numerical values as a numerical sequence into the buffer of the manual data input device 29, and displays the buffer value in the display area E (step S43). S44). Then, when an input key for defining data input is operated by the operator (step S45), the PMC CPU 18 stores the numerical value sequence of the buffer in the input value storage register RC as search target data (step S46). The contents stored in the buffer of the input device 29 are cleared (step S47).

Next, the PMC CPU 18 executes the processing of SUB6 in the same manner as described above to obtain the initial value RB and the final value RT of the index to be searched, and sets the search start initial value RB in the address search index i. . Next, PMC CPU1
8 shifts to the processing of SUB7 shown in FIG. 13, determines whether or not the value of the address search index i has reached the value of the final value RT of the address to be searched (step K1). I, j of data storage file
Drive torque Ti from spot and i + 1, j spot
And the value of Ti + 1 (from step S23, j
= 1), whether the search target data RC is between Ti and Ti + 1, that is, whether the drive torque corresponding to the search target data RC exists between the sampling time of i and the sampling time of i + 1 (Step K
2). If the search target data RC is not between Ti and Ti + 1, the PMC CPU 18 increments the value of the index i (step K3) and returns to step K1.
The process proceeds to the process of
The same processing as described above is repeatedly performed until the value of the address i between the address and Ti + 1 is detected or the value of the address search index i reaches the value of the final value RT of the address to be searched. I do.

If the value of the address i where the search target data RC is between Ti and Ti + 1 is detected, that is, if the result of the determination in step K2 is true, the PMC C
When the elapsed time of sampling is selected as the horizontal axis, the PU 18 moves and displays the cursor at the position of i · Δt on the horizontal axis by the same processing as the processing shown in steps S7 to S10, When the screw position is selected as the horizontal axis, the cursor is moved to and displayed at the position of Si on the horizontal axis, and the position on the graph corresponding to the search target data RC detected in the current process is indicated. Each variable data corresponding to the address i of the data storage file, that is, the drive torque value Ti, screw rotation speed Ri, motor output Hi, corresponding to the search target data RC stored at the address i of the sampling data storage file. Screw retreat speed Vi, back pressure Pi, screw position Si, and elapsed time i after the start of the metering kneading process
Display each value of Δt in the numerical data display area D of the display screen (Step K4 to Step K7).

Next, the PMC CPU 18 operates the search end key or the function key Fq by the operator.
The process enters a standby state waiting for an operation of a next candidate key (step K8 to step K9). The search end key is a function key for terminating the search mode processing and returning to the normal sampling and graph display mode as described above, but its function is redefined in the SUB7 routine. , Acts as a search end key for ending the search for the next candidate.

Here, when the operator operates the next candidate key, the PMC CPU 18 shifts to the process of step K3 and increments the value of the address search index i. The same processing as described above is repeatedly executed until the value of the intervening address i is detected again or until the value of the address search index i reaches RT. Then, the search target data R
When the value of the address i where C is between Ti and Ti + 1 is detected again, the processing of steps K4 to K7 is executed in the same manner as described above, and the newly detected address i
The cursor is moved to a position corresponding to the search target data RC based on the value of, the value of each variable data is displayed as a numerical value, and the standby again waits for the operation of the next candidate key or the search end key for ending the next candidate search. Enter the state. Therefore, even in the case where there are many sampling periods in which the driving torque is RC in the same kneading and kneading process, the operator can detect all of the screw positions or every elapsed time.

By operating the next candidate key, the driving torque becomes R
When the search and display processing of all the sampled data C has been completed and the value of the address search index i has reached the final address RT to be searched, or the sampled data having the drive torque corresponding to RC is stored. If the value of the address search index i is automatically incremented up to RT in the first search processing, the numerical display and the cursor display position on the display screen are not changed, and the operator operates the search end key. S
The process of UB7 is terminated. P that has completed SUB7 processing
The MC CPU 18 again shifts to the processing of step S14, and waits for an operator's key operation by the determination processing of steps S14 to S22.

As described above, taking as an example the case where the torque key is operated as the first input means for selecting a search item (step S16), the second input means for designating the type of data to be searched, that is, The operation of the maximum value key (step S40), the minimum value key (step S41), the average value key (step S42), and the setting of arbitrary numerical data for the selected search item to perform the search operation The operation of the numeric keypad and the input keys (step S43, step S45), which are data input means for inputting numerical data, has been described, but other function keys, which are first input means for selecting a search item, namely, Rotation speed key (Step S17), motor output key (Step S18), reverse speed key (Step S19), back pressure key (Step S17) If 0) is operated also, the function of the numeric keypad with input keys are second input means and numerical data input means are the same. However, since the value set in the address search index j differs depending on the type of the operated first input means (step S23 to step S27), the type of the variable to be searched in each processing routine is different (step C2). C5, C6, steps E2, E5, E6, steps G2, G5, step K2).

When the screw position key, which is the first input means for selecting a search item, is operated, the CPU for CPU 18 which has detected this operation in the discrimination processing of step S21 is designated by numerical data. In order to display various variable data corresponding to the screw position, FIG.
4 is executed. CPU1 for PMC
8, first, Steps S43 to S43 in FIG.
The processing of steps V1 to V5 is executed in the same manner as the processing of step 47, and the value of the screw position numerically input by the operator is used as the search target data as the input value storage register RC.
After that, the value of the address search index i is initialized to 0 (step V6). Next, the PMC CPU 18
It is determined whether or not the value of the address search index i has reached the value of the final storage address n of the sampling data storage file (step V7). If not, the sampling data storage based on the value of the address search index i The values of the screw positions Si and Si + 1 are read from the application file, and whether or not the search target data RC is between Si and Si + 1, that is, between the sampling time of i and the sampling time of i + 1, It is determined whether or not a corresponding screw position exists (step V
8). Then, if the search target data RC is not between Si and Si + 1, the PMC CPU 18 increments the value of the index i (step V9), and shifts to the processing of step V7 again. Is detected between addresses Si and Si + 1, or
Alternatively, the same processing as described above is repeatedly performed until the value of the address search index i reaches the value of the final value n of the address to be searched.

If the value of the address i where the search target data RC is between Si and Si + 1 is detected, that is, if the result of the determination in step V8 is true, the PMC C
When the elapsed time of sampling is selected as the horizontal axis, the PU 18 moves and displays the cursor at the position of i · Δt on the horizontal axis by the same processing as the processing shown in steps S7 to S10, When the screw position is selected as the horizontal axis, the cursor is moved to the position of Si on the horizontal axis and displayed to indicate the position on the graph corresponding to the search target data RC, and the address is set to the address i of the sampling data storage file. Corresponding to each corresponding variable data, that is, the drive torque value Ti, screw rotation speed Ri, motor output Hi, screw retreat speed Vi, back pressure Pi, and search target data RC stored at the address i of the sampling data storage file. The values of the screw position Si and the elapsed time i · Δt after the start of the weighing and kneading process are represented by numerical data on the display screen. Display in display area D (step V
10 to step V13).

If the value of the address i at which the search target data RC is between Si and Si + 1 is not detected even when the value of the address search index i reaches n, the screw position input as the search target data is not detected. In this case, PMC
The CPU 18 displays an alarm message such as "The screw has not retreated to the input position" on the display screen (step V14).

CPU 1 for PMC after SUB8 processing
8 again shifts to the processing of step S14,
By the determination processing of 14 to step S22, the operator waits for the key operation.

Then, the operator who extracts desired numerical data from the graph on the display screen by the position specification by inputting the position of the cursor, the type of data such as the search item and the maximum / minimum, or the input of arbitrary numerical data is pressed by the operator. When the operation is declared to end the search mode, the PMC CPU 18 detects this operation in the determination processing of step S22, exits the standby state waiting for a key operation for selecting a search method, and returns to the determination processing of step S4 again. Thereafter, until the monitor process is stopped by operating the screen switching key, or until the data search key is operated again to declare the start of the search mode, the process of step S13 described above is performed. , And repeatedly execute processing relating to sampling of variable data and graph display.

[0063]

According to the monitoring device of the injection molding machine of the present invention , a graph showing the change of the variable in the weighing and kneading process can be obtained.
When the variable and the maximum or minimum value are specified,
The place of the specified maximum or minimum value in the specified variate
Values of one or more of the variables
Since the display can be performed, the plasticizing phenomenon of the resin during the weighing and kneading and the correspondence between the weighing and kneading conditions and the molded product can be grasped in detail, and the setting operation of the weighing and kneading conditions becomes easy.

Further, since the display control means is provided with means for designating a position by moving a cursor on the graph, the operator can easily designate a desired position on the graph while looking at the graph. it can.

Further, a first input means for inputting items such as a motor torque of the measuring motor, a motor output, a screw rotation speed, a screw retreat speed, etc., and a type of data to be searched for the input item are designated. A second input means for determining the position on the graph by specifying the item and the data type, and automatically specifying the position. Therefore, the maximum value, the minimum value, the average value, and the like of the motor torque are obtained. Even when searching for various variable data corresponding to unknown variables, you can easily check the numerical data of various variables and their corresponding positions on the graph simply by selecting and entering items and data types. .

Further, by moving the cursor to a desired position on the graph based on the input of the univariate numerical data, numerical data of various variables corresponding to the position can be displayed. If it is known, simply performing a numerical data input operation on the known data enables the corresponding position on the graph and all the other variable data to be confirmed accurately and promptly.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main part of a monitor device according to an embodiment of the present invention and an injection molding machine to which the monitor device is attached.

FIG. 2 is a diagram conceptually showing a configuration of a file unit in the monitor device of the embodiment.

FIG. 3 is a flowchart showing an outline of a monitor display process by the monitor device of the embodiment.

FIG. 4 is a continuation of the flowchart showing the outline of the monitor display process.

FIG. 5 is a flowchart showing a part of a monitor display process.

FIG. 6 is a flowchart showing a part of a monitor display process.

FIG. 7 is a flowchart showing a part of a monitor display process.

FIG. 8 is a flowchart showing a part of a monitor display process.

FIG. 9 is a flowchart showing a part of a monitor display process.

FIG. 10 is a flowchart showing a part of a monitor display process.

FIG. 11 is a flowchart showing a part of a monitor display process.

FIG. 12 is a flowchart showing a part of a monitor display process.

FIG. 13 is a flowchart showing a part of a monitor display process.

FIG. 14 is a flowchart showing a part of a monitor display process.

FIG. 15 is a diagram showing a display example of a display screen of the monitor device of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection cylinder 2 Screw 4 Pressure detector 12 RAM 13 ROM 14 RAM 16 A / D converter 17 CPU for pressure monitoring 18 CPU for PMC 22 Bus 24 Nonvolatile memory 26 CRT display circuit 29 Manual data input device with display

Continuation of the front page (72) Inventor Kaoru Hiraga 3580 Kobaba, Oshino, Oshino-mura, Minamitsuru-gun, Yamanashi Prefecture FANUC CORPORATION (56) References JP-A-5-42570 (JP, A) JP-A-2-8025 ( JP, A) JP-A-6-238729 (JP, A) JP-A-3-246468 (JP, A) JP-A-6-8299 (JP, A) JP-A-5-185484 (JP, A) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) B29C 45/00-45/84 G09G 5/00-5/40

Claims (6)

(57) [Claims] 1. A sampling means for detecting and storing, at predetermined intervals, various variables changing in a weighing and kneading process, and a graph for displaying a transition of the various variables acquired by the sampling means on a display screen. Display means; and the change displayed on the display screen.
First input means for inputting the type of quantity;
Either the maximum or minimum value of the variable identified in the column
Second input means for specifying, and the maximum value or the minimum value
A section providing means for providing a section to be obtained;
Input means, the second input means and the section providing means
Group corresponding to the maximum or minimum value specified based on
Means for finding a position on the rough, and the position on the found graph
And a display control means for numerically displaying the values of one or more of the various variables in the above-mentioned various variables on the display screen. 2. Various types of materials that change during the weighing and kneading process.
Sampling means for detecting and storing variables at predetermined intervals
And the various changes obtained by the sampling means.
Graph table to display the change of quantity on the display screen
Indicating means, and the change displayed on the display screen.
First input means for inputting the type of quantity, and a position on the graph
Input means for inputting numerical data for designating
Based on the first input means and the second input means.
Graph corresponding to the numerical data of the variable identified
Means for determining the position on the graph, and
The values of one or more of the various variables in
Display control means for displaying numerical values on the display screen.
Monitor for injection molding machine. 3. The second input means also specifies an average value.
When the average value is designated,
The change specified by the first input means in a given section
Means for obtaining an average value of the amount is provided, and the display control means comprises:
The obtained average value is plotted in a straight line on the display screen.
2. The injection molding machine according to claim 1, wherein the display is rough.
Nita device. 4. A next candidate key, wherein the next candidate key is operated.
Position on the graph corresponding to the input numerical data
3. The monitor of an injection molding machine according to claim 2, wherein: 5. The type of the variable is at least one of a screw position, a motor torque of a weighing motor, a screw rotation speed, a motor output, a screw retreat speed, and a back pressure.
A monitor device for an injection molding machine according to any one of claims 1 to 4 . 6. The monitor of an injection molding machine according to claim 1, wherein said display control means displays a cursor at a position on said graph.