JPH0482722A - Monitor apparatus of injection molding machine - Google Patents

Abstract

PURPOSE:To accurately monitor the state of a molding machine and to rapidly perform correction such as the conversion of a molding condition by detecting the temp. of respective temp. control points to display the same and displaying not only the ON/OFF state of a heater but also the operation state of an injection molding machine. CONSTITUTION:A temp. detection means detects the temps. detected at every predetermined cycle by temp. sensors S1-Sn. A means converting the detected temps. to data for graph display converts the detected temps. to the data for graph display. An operation detection means detects the operation states of respective heaters and the operation state of an injection molding machine at every predetermined cycle. The means converting the detected temps. to the data for graph display converts the detected operation states to data for displaying the operation states of the heater and the injection molding machine. A display means displays the temps. of respective temp. control points and the operation state of the injection molding machine on the basis of the converted data using a time as a function.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a monitoring device for monitoring the operating status of an injection molding machine, particularly the temperature at each temperature control point.

In conventional injection molding machines, the temperature of temperature control points such as the nozzle, cylinder, mold, resin supply port, etc. is detected using a temperature sensor, etc.
Generally, a method is adopted in which the temperatures at these temperature control points are feedback-controlled by turning on and off heaters so that the temperatures at these temperature control points reach set temperatures.

In addition, there is also a device that displays the temperature of each control point detected by each of the temperature sensors on a display screen such as a CRT display device so that the temperature of each control point can be monitored. 63-17018).

Problems to be Solved by the Invention It is insufficient as a monitor device to display only the current values of each temperature control point of the nozzle, cylinder, mold, resin supply port, etc. of an injection molding machine on a display device. Monitoring the temperature at each temperature control point allows operators, etc. to visually check whether the temperature at each control point is appropriate, making it easier to discover abnormalities, and using it to determine whether to modify molding conditions. Therefore, simply displaying the current temperature of each temperature control point is insufficient and too small as data to be referred to when making the various judgments described above.

Therefore, an object of the present invention is to, together with the temperature of each temperature control point,
An object of the present invention is to provide a monitor device for an injection molding machine that can also display the operating status of the injection molding machine.

Means for Solving the Problems The present invention provides a temperature detection means for detecting the temperature detected by a temperature sensor at a temperature control point at a predetermined period, an operating state of a heater at each temperature control point at a predetermined period, When the injection molding machine is stopped, running, or injecting.

an operation detection means for detecting operating conditions such as during pressure holding and metering; and means for converting the temperature detected by the temperature detection means and the state detected by the operation detection means into data for displaying a graph; By providing a display means that sequentially displays the data converted to data for each graph display as a function of time, the history of temperature changes at each temperature control point, the on/off state of the heater at each temperature control point, and injection The history of the operating status of the molding machine is simultaneously displayed in the form of a graph on the display device.

Also, when displaying a graph on a display device, the display area is divided into multiple areas, and when the graph to be displayed enters the divided area, the graph that was already displayed in that area is erased. The temperature change state of each temperature control point, the on/off state of the heater, and the operating state of the injection molding machine are displayed in the past for a certain period of time compared to the current time.

The operating temperature detection means detects the temperature detected by the temperature sensor at a predetermined period, and the means for converting the detected temperature into data for graph display based on the detected temperature converts the detected temperature into data for graph display. Convert to data for Further, the operation detection means detects the operation state of each of the heaters and the operation operation state of the injection molding machine at the predetermined period, and the means for converting the detected heater and operation state into data for graph display. Convert data for display. Based on the data thus transformed, the display means displays the temperature and heater of each temperature control point as a function of time.

Synchronize and display the operating status of injection molding machines.

Embodiment FIG. 2 is a block diagram of essential parts of an injection molding machine according to an embodiment of the present invention.

In Fig. 2, 1 is a screw, 2 is a heating cylinder,
3 is a servo motor that drives the injection screw 1 in the axial direction, and 4 is a pulse coder that detects the rotation of the servo motor 3 and the position of the screw. The heating cylinder 2 is divided into a plurality of heating zones, and each heating zone is equipped with band heaters B1 to Bn.
n is connected to the power supply 6 via switches 7-1 to 7-n,
The heating cylinder 2 is heated. Further, temperature sensor sections S1 to Sn of the temperature converter 5 are arranged in each heating zone to detect the temperature of each heating zone.

Reference numeral 20 denotes a numerical control device (hereinafter referred to as an NC device) as a control device for controlling the injection molding machine, and the NC device 2
0 is an NC microprocessor (hereinafter referred to as CPU) 21 and a programmable machine controller (hereinafter referred to as P
It has a CPU 22 for MC), and a CPU 22 for PMC.
Connected to the PU 22 are a ROM 23 that stores sequence programs and the like for controlling sequence operations of the injection molding machine, and a RAM 24 that is used for temporary storage of data.

The NC CPU 21 has a ROM 25 that stores a management program that controls the entire injection molding machine, and a servo interface 26 that has a servo circuit that drives and controls the servo motors of each axis for injection, clamping, screw rotation, ejector, etc. connected via. In addition, in FIG. 2, the injection servo motor 3. Only the servo circuit 27 of the servo motor 3 is shown. In addition, 29 is a non-volatile shared RAM consisting of bubble memory and CMOS memory.
It has a memory section that stores NC programs etc. that control each operation of the injection molding machine, and a setting memory section that stores various setting values, parameters, and macro variables.

30 is a bus arbiter controller (hereinafter referred to as BAC), and the BAC 30 includes an NC CPU 21 and a PMC CPU 22 . Shared RAM29. Input circuit 31. Each bus of the output circuit 32 is connected, and the bus to be used is controlled by the BAC 30. Further, 34 is a manual data input device (hereinafter referred to as a CR7 display device) connected to the BAC 30 via the operator panel controller 33.
It is called a CRT/MDI), and various commands and setting data can be input by operating various operation keys such as soft keys and numeric keys. In addition, 2
A RAM 8 is connected to the NC CPU 21 by bus and is used for temporary storage of data.

The a circuit 32 is connected to the servo circuit 27, and outputs a torque limit value that limits the 8 torques of the injection servo motor 3.
n to turn the switches 7-1 to 7-n on and off, and connect the power supply 6 to the band heaters B1 to Bn to turn them on.
It is supposed to be controlled off. It is also connected to the temperature converter 5, which specifies the channel (temperature sensor section), converts the detected temperature of the channel into a digital signal, and converts the detected temperature of the channel into a digital signal.
The signal is output to an input circuit 31 of the device 20.

Although not shown in FIG. 2, a heater and a temperature sensor section of the temperature converter 5 may also be provided at the resin supply port.
When a mold is heated by a heater and the mold temperature is detected by a temperature sensor and controlled by on/off control of the mold temperature heater, these heaters are also connected to the switch, and these temperature The sensor section is also connected to the temperature converter 5.

In the above configuration, the NC device 20
NC that controls each operation of the injection molding machine stored in M29
While the PMC CPU 22 performs sequence control based on the programs and parameters such as various molding conditions stored in the setting memory section and the sequence program stored in the ROM 23, the NC CPU 21 controls the servo circuits for each axis of the injection molding machine. The injection molding machine is controlled by distributing pulses to the injection molding machine via the servo interface 26.

Figure 3 shows an example of the CRT screen display when the CRT/MD I 34 is switched to the temperature monitor screen. It shows. That is, the number of sensors and switches in Fig. 2 is 4, and Sn is S4.7-n is 7-4.
This is an example of the case where

In FIG. 3, TSLI is a line showing the set temperature for the nozzle section, and T1 is a graph showing changes in the temperature of the nozzle section. Further, Hl is a graph representing the on/off state of the heater of the nozzle portion, that is, the switch 7-1. Also, TSL2°TSL3. TSL4 is a line indicating each set temperature of heating zones 1 and 2°3 of the cylinder, and T2. T
3. T4 is heating zone 1. 2. It is a graph showing the temperature change of No. 3. Furthermore, H2, H3, H4 are band heaters B2. B3. It is a graph which shows the on/off state of B4 (-Bn). Also, OPL, IJL
, PKL, and EXL are lines indicating whether the injection molding machine is in operation, injecting, holding pressure, and measuring.

In FIG. 3, the horizontal axis (X-axis) is a time axis, and the vertical axis (Y-axis) is an axis showing changes in temperature or operation.

FIG. 4 is an explanatory diagram of set values of coordinate values on the screen for displaying each graph on the CRT screen.

The coordinate origin (XO,
TOI), the origin (XO, HIA) that displays the on state of the bunt heater of the nozzle part, the origin (XO, HIB) that displays the off state, and the heating zone 1. 2. 3 set temperature TS2. TS3. The origin (XO
, TO2), (XO.

TO3), (XO, TO4), heating zone 1. 2. The origin (XO,
H2A), (XO, H3A), (XO.

H4A), the origin (XO, H2B) indicating the state in which the band heaters of heating zones 1, 2.3 are off.

(XO, H3B), (XO, 84B), coordinate origin (XO, 0PA) indicating that the injection molding machine is in operation, coordinate origin (XO, 0PB) indicating that the injection molding machine is stopped, coordinate origin (XO, I JA), coordinate origin (XO, IJB) representing the state not injecting, coordinate origin (XO, IJB) representing the state during holding pressure
PKA), the coordinate origin (XO
, PKB), coordinate origin (XO9EXA) indicating that weighing is in progress
, the coordinate origin (XO, EXB) that indicates the state of not being weighed.
are set in advance in the shared RAM 29, respectively. Also, when the CRT screen is switched to the temperature monitor screen, the coordinate origin (XO,' TOI), (XO,
Setting lines TSLI, TSL2. TSL3. It is set so that TSL4 is drawn.

Next, regarding the temperature monitor operation display processing, Fig. 1(a),
This will be explained with reference to the flowcharts shown in (b), (c), and (d).

When a temperature monitor command is input from the CRT/MDI 34, the PMC CPU 22 switches the CRT screen to the temperature monitor display screen, and displays the title of the graph to be displayed and each set temperature display coordinate, as shown in Figure 3. Temperature setting lines TSLI to TSL4 are drawn from the origin, and the process shown in FIG. 1 is started every predetermined period.

First, the counter C is incremented by "1".The counter C is initially set to "0". ), add the value obtained by multiplying the value of counter C by the predetermined pitch α set to the coordinate value XO of the X-axis (horizontal axis) of the coordinate origin to be displayed in the graph, and calculate the X-axis position to be displayed in the graph in the corresponding period. , set the index i to "1" (steps 81 to S3
).

Then, the PMC CPU 22 is a BAC 30, an output circuit 3
2 to input the detected temperature from the temperature sensor section S1 indicated by the index i into the input circuit 31, and input the detected temperature T from the temperature sensor section Sj to the input circuit 31.
Ai is read (step S4). Next, the set temperature TSt indicated by index i is subtracted from this detected temperature TAi to obtain a coefficient β
Multiply by i and add the coordinate origin TO1 of index i in the vertical axis (Y axis) direction to this value to obtain the display coordinate value of the vertical axis and register Y
Ai (step S5). Next, it is determined whether the value of counter C is "1" (at first it is 1) (step S6)
, “1”, the process moves to step S8 and the register Y
The value stored in Ai is stored in register YBi.

Then, it is determined whether the band heater i is on or not based on whether or not an on command is currently being output to the switch 7-1 indicated by the index i, and if it is on, the Y-axis coordinate value indicating on is set in the register YCi. If HiA is off, the Y-axis coordinate value Hi indicates off.
B is stored (steps 89 to 511), and the counter C is stored again.
In step 512), it is determined whether the value of rlJ is "1" or not.
Then, the value to be stored in register YCi is set to register YDi.
, increment the index i by "1", and store the index 1
is the number of temperature control points N (N = 4 in the examples of Figures 3 and 4)
It is determined whether or not the value exceeds (steps 814 to 816).

If index i does not exceed N (=4), return to step S4 and repeat steps 84 to 816, and if index i exceeds N, step S16 to step S17
to move to.

In step S17, it is determined whether or not the injection molding machine is currently in operation, and if it is in operation, the Y-axis coordinate value OPA indicating that it is in operation, and if it is stopped, the Y-axis coordinate value OPB indicating that it is stopped is stored in the register YE.
(Step S18゜519). Next, it is determined whether the counter C is "1" (Step 520)) If rlJ, the stored value of the register YE is stored in the register YF (Step 522). Next, it is determined whether or not injection is in progress. If the Y-axis coordinate value IJA indicating the inside is not being injected,
The Y-axis coordinate value IJB indicating that injection is not in progress is stored in register Y.
If counter C is "1", the value to be stored in register YG is stored in register YH (steps S23 to S26, 528).

Next, similarly determine whether pressure is being held or not, and if it is holding pressure, register the Y-axis pressure mark value PKA, which indicates that ash is being held, and if it is not holding pressure, register the Y-axis coordinate value PKB, which indicates that it is not holding pressure. If the counter C is "1", the stored value of this register YI is stored in the register YJ.

Furthermore, it is determined whether or not weighing is in progress, and if it is in progress, the Y-axis coordinate value EXA indicating that measurement is in progress is stored in register YK, and if it is not in measurement, Y-axis coordinate value EXE indicative of not in progress is stored in register YK. ”, then store the memory location of this register YK in register YL (steps S29 to S32, S3
4-S38.540).

Next, it is determined whether the flag F1 is "1" or not, and if it is not "1" (the flag F1- is initially set to "0"), It is necessary to judge whether or not X is 1/2 or more of the maximum value MX on the X axis of the display area (steps 841, 542), but since it is initially smaller than XM/2 (step S), the process moves to step 346 and flag F2 is set.
Determine whether or not is "]". Note that this flag F2 is also initially set to 10. Then, if the flag F2 is "0", the processing of the corresponding cycle is ended.

In this way, in the first processing cycle in which the monitor command is input (counter C is "1"), the Y-axis temperature display data corresponding to the temperature of each temperature control point detected at the time of the relevant cycle is stored in the register YBi. , the heater at each temperature control point is turned on,
When it is detected that it is off, the Y-axis coordinate data indicating whether it is on or off is stored in the register YDi, and whether it is in operation or not, whether it is injecting or not, whether it is holding pressure or not, and whether it is measuring or not. The display data indicating each state according to the detection state of the register YF
, YH, YJ, and YL.

Then, in the next processing cycle, steps 81 to S described above are performed.
After performing the process in step S6, the counter C becomes "1".
Since this is not the case, the process moves from step S6 to step S7.
The coordinate point (X-α, YB
From i), a line is drawn between the coordinate point (X, YAi) determined by the X-axis pressure gauge value X of the period and the Y-axis coordinate value corresponding to the temperature detected in the period stored in the register YAi (step S7 ). Then, the processes from step 88 to step S12 described above are performed, and in step S12, the counter C is
1", the point (X-a) determined by the X-axis coordinate value (X-α) of the previous cycle and the Y-axis coordinate value indicating ON/OFF of the heater in the previous cycle stored in the register YDi , YDi) and the turn-on of the heater in the corresponding period.

A line is drawn between the coordinate points (X, YCi) indicating OFF (step 513). Then, the processes of steps 314 to S16 are performed once, and the processes of steps 84 to 816 are performed until the index i exceeds the number N (=4) of temperature control points, and the detected temperature of each temperature control point is determined, and the heater is turned on and off. Show status. When the index i exceeds N, the processes of steps 817 to S20 are performed, and since the counter is not "1", the point (X-α, YE) indicating the operating state of the previous cycle and the operating state of the current cycle are similarly indicated. Draw a line between points (X, YE) (step 52)
1).

Next, steps 822 to S26 are performed, and the process moves from step S6 to step S27, from the point (X-α, YH) indicating the injection state of the previous cycle to the point (X, YG) indicating the injection state of the current cycle. Draw a line between them. Then step 834
- Processing of step S32 is performed, and since the counter C is not "1", the process moves to step 833, and the point (X-α, YJ) indicating the pressure holding state of the previous cycle is changed from the point (X-α, YJ) indicating the pressure holding state of the current cycle. , YI). Furthermore, step 8
Steps 34 to S38 are performed, and the process moves from step 338 to step S39, where the point (X-α, YL) indicating the measurement state of the previous cycle is changed from the point (X-α, YL) indicating the measurement state of the current cycle.
, YK). If the current X-axis pressure index value X is not 1/2 or more of the X-axis maximum value XM of the drawing area, steps S40 to S42. The process of S46 is performed and the process of the corresponding cycle is ended. The process described above is repeated for each cycle, and the temperature change state of each temperature control point, the heater on/off state, and the operating state (during operation, injection, holding pressure, and metering) are as shown in Figure 3. Display as shown.

In this way, the display is sequentially displayed, and when it is detected in step S42 that the X-axis coordinate value X of the display point has become 1/2 or more of the X-axis innermost coordinate value XM of the display area, the display screen that has already been displayed is Erase the graph display on the right half of (Step 5)
43). In this embodiment, it is assumed that the graph is displayed from left to right on the display screen as time passes. Then, set flags Fl and F2 to "1".

Steps 844 and 545) and steps 846 and 847 are performed to complete the processing of the cycle. From the next cycle, steps S1 to S41 are performed and flags Fl and F2 are set to "1", so step S41. Proceed to S46, S47, and step S
In step 47, it is determined whether the X-axis coordinate value X has become equal to or greater than the display area maximum X-axis maximum value XM, and if it has not, the processing for the cycle is ended. After that, display the graph for each period and
When the axis coordinate value exceeds the X-axis maximum value XM, step S
47 to step 848, the graphs already drawn on the left half of the display screen are erased, and graphs Fl and F2 are displayed.
Set to "0" and counter C to "10" (
Steps 349 to 551), the processing of the corresponding processing cycle is ended.

From the next cycle, a graph will be drawn from the starting point of the display area as a continuation of the graph drawn in the right half of the display area.

In the above example, the graph display area is divided into two, and when the graph display progresses in one area, the graph that was previously drawn in this one area is erased and a new graph is displayed. However, when the graph display area is divided into two or more multiple areas and the graph display invades one divided area, even if you erase the previous graph displayed in this area. good. In this case, if the progress direction of the graph display is from left to right, the graph display is displayed at the left end of the area to the right next to the area where it was erased, or from the oldest data to the right end. From the left end to the point currently drawn, the temperature, etc. of each temperature control point is displayed according to the direction of time.

Also, if you display a graph in the entire graph display area without dividing the graph display area, when displaying the next data, erase the graph in the entire area that was being displayed and display the graph again from the starting point. You can do it like this.

Furthermore, the graph can be displayed in the entire graph display area,
Next, when displaying from the starting point, the graph may be displayed by changing the display color, and after displaying the graph in multiple colors, the oldest graph display may be deleted.

Effects of the Invention In the present invention, the temperature at each temperature control point is detected at predetermined intervals, this temperature is displayed as a graph as a function of time, and the heaters at each temperature control point are turned on and off in synchronization with this temperature display. In addition to displaying a graph indicating the off state, graphs indicating the operating status of the injection molding machine (running, injecting, holding pressure, weighing, etc.) are also displayed synchronously, so the monitor screen Reference information for monitoring is displayed at the same time, allowing you to monitor the temperature change status of each temperature control point of the cylinder, the plasticization status, and the resin status inside the cylinder, as well as turning the heater on and off. It is possible to accurately monitor the condition of the molding machine by relating it to the operating condition of the injection molding machine and the operation condition of the injection molding machine. For example, if the temperature at the temperature control point does not reach the set value even though the heater is often turned on,
This means that heat radiation is large or heat absorption into the resin is large, and when such a state is detected, corrections such as changing molding conditions can be quickly made.

[Brief explanation of the drawing]

FIGS. 1(a), (b), (c), and (d) are flowcharts of temperature monitor display processing in one embodiment of the present invention, and FIG. 2 is a flowchart of the main parts of an injection molding machine in the same embodiment. The block diagram, FIG. 3, is a diagram showing an example of the display on the monitor screen in the same embodiment, and FIG. 4 is the setting values of the coordinate values on the screen for displaying each graph on the CRT screen in the same example. FIG. DESCRIPTION OF SYMBOLS 1... Screw, 2... Heating cylinder, End... Temperature converter, 7-1 to 7-n... Switch, 20... Numerical control device, S1 to Sn... Temperature sensor B1 ~Bn・
・Band heater. Patent applicant: FANUC Co., Ltd.

Claims (2)

[Claims] (1) Temperature control In an injection molding machine where a temperature sensor is provided at each point and the temperature is controlled by turning on/off the heater based on the temperature detected by the temperature sensor, the temperature is detected by the temperature sensor at a predetermined period. temperature detection means for detecting temperature; operation detection means for detecting the operating state of each of the heaters and the operating state of the injection molding machine at the predetermined period; and the temperature detected by the temperature detection means and the operation detection means. It is characterized by comprising means for converting the detected state into data for graph display, and display means for sequentially displaying the data converted by the above-mentioned means for converting into data for graph display as a function of time. Monitoring device for injection molding machines. (2) The injection molding according to claim 1, wherein the display means divides the graph display area of the display screen into a plurality of areas, and when the graph to be displayed enters the divided area, erases the graph already displayed in the area. Machine monitor device.