JPH0698650B2 - Injection molding machine injection characteristic display method - Google Patents

Description

The present invention relates to an injection characteristic display method for an injection molding machine, and more particularly to a color graphic display method.

[Conventional technology]

In the injection process, when the molten molding material injected from the nozzle passes through the runners and gates and is filled in the cavity, the flow of the molding material becomes the most suitable state in each process. Thus, the injection speed of the screen is controlled in multiple stages.

Also, burrs, sledges, sinkers, shots,
In order to prevent mold release defects and the like, pressure control such as secondary holding pressure and tertiary holding pressure is performed in the pressure holding step.

[Problems to be Solved by the Invention]

Conventionally, the data actually measured in such an injection step and the subsequent pressure holding step have been signal-processed and displayed as numerical values on the display panel. The operator judges whether the operating condition of the injection molding machine is good or bad by comparing this numerical value with a preset target value.

However, with this method, it is not possible to accurately grasp the variation in injection speed and injection pressure for each shot.
There is a problem that it is not easy to confirm whether the injection pressure setting and the holding pressure switching setting are correct.

An object of the present invention is to eliminate such drawbacks of the prior art by using a microcomputer type control device that automatically controls each operation of the injection molding machine, and to ensure that the injection speed and the injection pressure vary from shot to shot. It is an object of the present invention to provide a method of displaying injection characteristics of an injection molding machine, which enables easy and reliable confirmation of whether each setting is good or bad.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention sets a holding pressure switching point at approximately the center of the X-axis of a display screen, and based on the holding pressure switching point, an injection stroke scale is set on one side and a holding pressure is set on the other side. Display a graphic screen in which a time scale is provided, a velocity scale is provided in the Y-axis direction orthogonal to the injection stroke scale, and a pressure scale is provided in the Y-axis direction orthogonal to the pressure holding time scale, and the graphic screen is displayed on the graphic screen. , Draw a preset injection speed setting pattern and holding pressure setting pattern, and use the injection speed setting pattern and the holding pattern as the measured pattern based on the injection speed data and the injection pressure data measured in the injection process and the pressure holding process. A line is drawn on the pressure setting pattern, and the actual measurement pattern based on the injection speed data and injection pressure data measured in the next shot is further displayed on the screen. The latest actual measurement pattern is displayed by overwriting, and the color of the immediately previous actual measurement pattern is automatically changed to the color of the accumulated actual measurement pattern. The accumulated actual measurement pattern of 1 is displayed in different colors.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are a front view and a plan view of an injection molding machine according to an embodiment of the present invention, FIG. 3 is a block diagram of a graphic display device mounted on the injection molding machine, and FIG. It is an enlarged plan view of a panel.

First, the schematic configuration of the injection molding machine will be described with reference to FIGS. 1 and 2. The injection molding machine 1 includes a mold clamping device 2 having a toggle-type mold clamping mechanism, a heating cylinder 3 for injecting a molten resin into a cavity, a hopper 4 for supplying resin pellets to the heating cylinder 3, and a heating cylinder. Three
It is mainly composed of a drive control section 5, an operation panel 6 and a display panel 7 for rotating and moving back and forth the internal screw.

The operation panel 6 for setting each injection molding condition is
Off key 8 to stop all controls, as shown
Heat up key 9 to select the mode to raise the oil temperature to a certain temperature, die thickness / screw removal key 10 to select the die thickness / screw removal mode, check key 11 to select the check mode, data memory Mode keys such as a data memory key 12 for selecting a mode and a start key 13 for setting a start mode are provided.

Also, as the display key for setting the screen and displaying the panel to set the injection conditions, the injection key 14, the mold opening / closing key
15, a counter / printer key 16, a charge key 17, a monitor key 18, a temperature key 19, a check key 20, an option key 21, a die thickness key 22 and the like.

Load key 23 and store key 24 as data memory keys
Also, a print key 25 and the like are provided.

Further, an on-key 26, an off-key 27, a scroll key 28, a ten-key 29, a reset key 30, an entry key 31, a cursor key 32, etc. are installed at predetermined positions.

Next, the schematic configuration of the graphic display device will be described with reference to FIG. As shown in the figure, the graphic display device includes a central processing unit (CPU) 33, a display data channel 34, a display buffer 35, a display controller 36, and a screen 37 such as a CRT.
It is mainly configured by and and is connected to the operation panel 6 described above.

The forward stroke (injection stroke) and the injection speed of the screw at the time of injection molding are not shown, but a rack attached to the screw, a pinion that meshes with the rack, a pulse encoder that detects the rotation angle of the pinion, and its pulse A pulse counter for counting the pulse signals output from the encoder, a clocking means for outputting a reference clock, and an arithmetic means detect and perform arithmetic processing. The injection pressure can be detected by a pressure sensor such as an oil pressure measuring head attached to the injection cylinder. The data of the detected injection speed and injection pressure are stored in a predetermined RAM address of the control unit.

Next, the operation of the color graph display will be described with reference to FIGS.

When the injection key 14 shown in FIG. 4 is pressed to display the injection screen on the display panel 7 and the scroll key 28 is pressed, the graph initial screen shown in FIG. 5 is displayed. A holding pressure switching point 38 is set at the center position of the X axis (horizontal axis) of this display screen, and that point is used as a reference point (0 point).

An injection stroke scale 39 is set in [mm] units on the right side of the screen based on the holding pressure switching point 38 (0 point), and a holding pressure time scale 40 is set in [second] units on the opposite left side. Has been done. As shown in the figure, in the injection stroke scale 39, the numerical value increases in the direction away from the holding pressure switching point 38 (0 point), and accordingly, the holding pressure switching point 38 (0 point) is set. It is displayed as a relative value based on the standard.

In addition, a speed scale 41 is set in the unit of [mm / sec] in the Y-axis direction (vertical axis direction) orthogonal to the injection stroke scale 39, and “setting value green, measured value purple” is set near the speed scale 41. Is displayed. On the other hand, a pressure scale 42 is set in the unit of [kgf / cm ² ] in the Y-axis direction (vertical axis direction) orthogonal to the pressure-holding time scale 40. “Measured value red” is displayed.

Therefore, on this screen, the speed and pressure data during the injection process are displayed in the right half screen area centering on the holding pressure switching point 38, and the pressure holding process is displayed in the left half screen area centering on the holding pressure switching point 38. Medium velocity and pressure data will be displayed.

As shown in FIG. 6, the injection speed setting pattern 43 and the holding pressure setting pattern 44 are drawn on the graphic screen having such a structure. This injection speed setting pattern
43 and the holding pressure setting pattern 44 are the same as those on the operation panel 6 described above.
It is preset by the key operation in
In the case of this embodiment, the injection speed setting pattern 43 is a two-stage gear shift. The injection speed setting pattern 43 is drawn in green on the actual screen, the holding pressure setting pattern 44 is drawn in yellow, and both setting patterns 43 and 44 are scaled so as to be appropriately separated on the screen. ing.

Next, as shown in Fig. 7, RA is measured by the current shot.
The injection speed and injection pressure data stored in M are drawn on the screen. The actual measurement value of the injection speed from the start of injection is written in purple as the actual speed pattern 45. On the other hand, the measured values of the injection pressure up to the time when the holding pressure is completed are written as the measured pressure pattern 46 in red. According to the progress of the actually measured speed pattern 45 and the actually measured pressure pattern 46, which are overwritten on the injection speed setting pattern 43 and the pressure holding setting pattern 44, the measured speed in the injection process and the pressure maintaining process is measured for the newly completed shot. And the measured pressure can be observed. It takes a few seconds to write all the lines, but it is finished by the start of injection in the next cycle.

The data measured in the next shot is overwritten as the measured speed pattern 45 and the measured pressure pattern 46 in the same manner as described above, but as shown in FIG. 8, the measured speed pattern 45 up to the previous shot is Accumulated measured speed pattern 45
The color of the line is automatically changed to white as b, the newest measured speed pattern 45 is drawn in purple as the new measured speed pattern 45a, and is color-coded as the accumulated measured pattern 45b.
Similarly to the measured pressure pattern 46, the measured pressure pattern 46 up to the previous shot is automatically changed to white as the accumulated measured pressure pattern 46b.
Is drawn in red as a new actually measured pressure pattern 46a and is color-coded as the accumulated actually measured pressure pattern 46b. In the next shot, the new actually measured speed pattern 45a becomes the accumulated actually measured speed pattern 45b, the new actually measured speed pattern 46a becomes the accumulated actually measured speed pattern 46, and the newly incorporated data is the new actually measured speed pattern 45a and the newly measured pressure. Pattern 46a
Written as

In this way, the data of each shot is sequentially overwritten on the screen, but at that time, only the new measured speed pattern 45a and the new measured pressure pattern 46a are displayed in purple and red, and the accumulated actual speed pattern 45b and accumulated Measured pressure pattern 46b
Are all white with the same color.

In this way, the injection speed setting speed pattern 43 and the holding pressure setting pattern 44, the new actually measured speed pattern 45a and the new actually measured pressure pattern 46a, the accumulated actually measured speed pattern 45b and the accumulated actually measured pressure pattern 46b have a total of five colors (accumulated actually measured). Since the speed pattern 45b and the accumulated measured pressure pattern 46b are both overwritten in a color-coded white),
As shown in black in the figure, the variation (variation) of the measured speed pattern 45 and the measured pressure pattern 46 for each shot can be clearly seen. The color of each pattern can be changed on the check mode screen.

Figures 10 and 11 show the first part of this graphic screen.
It is a figure for explaining an example of utilization. Conventionally, the peak value of the injection primary pressure was measured using a pressure gauge, and a value higher by about 15 to 20 kgf / cm ² than the peak value was set as the injection primary pressure. However, reading the peak value of the primary injection pressure with a pressure gauge requires skill, and a measuring instrument such as an oscilloscope must be separately prepared for accurate measurement.

By using the graphic screen of the present invention, it is possible to confirm at a glance whether or not the setting of the injection primary pressure is appropriate. That is, as shown in FIG. 10, the preset injection speed setting pattern 43 is compared with the actually measured speed pattern 45, and if the difference is large, the actually measured value does not come out as the set value,
The cause is that the setting of the injection primary pressure is too low.
Therefore, in this case, if the injection primary pressure is increased, the measured speed pattern 45 becomes the injection speed setting pattern 43 as shown in FIG.
It can be confirmed that it is operating normally.

12 to 14 are views for explaining the second application example of this graphics screen. Conventionally, since the holding pressure switching point is set by the skill of the operator, the set value varies and there is a problem in molding quality. By utilizing the graphic screen of the present invention, it is possible to judge whether or not the setting of the holding pressure switching point 38 is proper from the relationship between the set holding pressure switching point 38 and the measured pressure pattern 46.

That is, the example of FIG. 12 shows that the measured pressure pattern 46 is slowly dropped near the holding pressure switching point 38, and the holding pressure switching is fast. The example of FIG. 13 shows that the drop of the measured pressure pattern 46 near the holding pressure switching point 38 is sharp, and the holding pressure switching is appropriate. On the other hand, the example in FIG. 14 shows that the pressure temporarily rises before switching the holding pressure, and thus the switching of the holding pressure is slow. In this way, from the state of the holding pressure switching point 38 and the measured pressure pattern 46, the holding pressure switching point 38
You can check whether the settings are correct.

FIG. 15 is a diagram for explaining a third application example of the graphics screen according to the present invention. Conventionally, while measuring the weight of a molded product, the cooling time is extended until the time when there is almost no variation in weight, thereby indirectly recognizing the gate sealing time. Therefore, the completion of the gate seal could not be grasped accurately, and the holding pressure was set to a slightly longer time, resulting in a time loss during the molding cycle.

When this graph screen is used, as shown in FIG. 15, the injection speed of the measured speed pattern 45 is 0 after switching the holding pressure.
By reading the time up to the point (gate seal point 47), the gate seal time can be grasped directly and accurately. In the example of Fig. 15, the gate seal is completed 3.1 seconds after switching the holding pressure, so no matter how much the holding pressure is applied thereafter, the suriyu does not advance. Therefore, the holding time is 4
It can be seen that about a second is enough, and even if the holding time is further lengthened, there will be a time loss. In this way, the holding pressure is perfect, and it helps to shorten the molding cycle as much as possible.

〔The invention's effect〕

As described above, according to the present invention, the reference set pattern, the latest actual measurement pattern, and the accumulated actual measurement pattern formed by overwriting the previous actual measurement patterns are displayed in different colors. The position (state) of the actually measured pattern with respect to the setting pattern can be visually grasped clearly.

In addition, when the latest measured pattern is displayed, the color of the immediately preceding measured pattern is automatically changed to the color of the accumulated measured pattern. It is possible to know the directionality of the variation (variation) of the injection characteristic and the pressure holding characteristic from the change in the color region of the actually measured pattern, and it is possible to prepare in advance a countermeasure for the characteristic change.

Furthermore, by making the color of the latest measured pattern different from the color of the accumulated measured pattern, it is possible to visually clarify where in the range of variation (variation) of the injection characteristic and the holding pressure characteristic. The narrowed color area (variation range) and the fact that the latest measured pattern is within the color area of the accumulated measured pattern means that the molded state is stable. It can be easily and accurately determined whether or not it is stable.

In addition, by setting a holding pressure switching point at approximately the center of the X axis on the display screen and writing the measured speed pattern and measured pressure pattern on the screen, it is possible to check whether the injection primary pressure is set properly or not. Whether or not the setting of the pressure switching point is proper or the pressure holding time can be confirmed, and the operation of the injection molding machine can be simplified.

[Brief description of drawings]

The drawings are all for explaining the display method of the injection molding machine according to the embodiment of the present invention. FIGS. 1 and 2 are a front view and a plan view of the injection molding machine, and FIG. 3 is a graph display device. Block diagrams and FIG. 4 are enlarged plan views of the operation panel, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9, and FIG.
FIG. 11, FIG. 12, FIG. 12, FIG. 13, FIG. 14 and FIG. 15 are views for explaining the display of the graphic screen. 1 ... Injection molding machine, 6 ... Operation panel, 7 ... Display panel, 36 ... Display controller, 37 ... Screen, 38 ... Holding pressure switching point, 39 ... Injection stroke scale, 40 ... Holding pressure Time scale, 41 …… Speed scale, 42 …… Pressure scale, 43 …… Injection speed setting pattern, 44 …… Holding pressure setting pattern, 45 …… Measured speed pattern, 45a …… New measured speed pattern, 45b …… Stored Measured speed pattern, 46 …… Measured pressure pattern, 46a …… New measured pressure pattern, 46b …… Accumulated measured pressure pattern.

Claims (1)

[Claims] 1. A holding pressure switching point is set substantially at the center of the X axis of the display screen, and an injection stroke scale is provided on one side and a holding pressure time scale is provided on the other side based on the holding pressure switching point. A graphic screen provided with a velocity scale in the Y-axis direction orthogonal to the injection stroke scale and a pressure scale in the Y-axis direction orthogonal to the pressure holding time scale is displayed, and a preset injection is displayed on the graphic screen. Draw a speed setting pattern and a holding pressure setting pattern, and calculate the measured speed pattern and the measured pressure pattern based on the injection speed data and the injection pressure data measured in the injection process and the pressure holding process, respectively. Draw a line over the pressure setting pattern and display the measured speed pattern and measured pressure pattern on the screen using the following shots. The latest actual measurement pattern is displayed by overwriting, and the color of the immediately previous actual measurement pattern is automatically changed to the color of the accumulated actual measurement pattern. The accumulated actual measurement pattern that is an overwriting of the actual measurement pattern of
An injection characteristic display method for an injection molding machine, characterized in that each color is displayed separately.