JPH0696257B2 - Injection molding machine that displays weighing and kneading conditions as a graph - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an injection molding machine.
In particular, the present invention relates to a graph display of measurement / kneading conditions in an injection molding machine.

[0002]

2. Description of the Related Art Conventional injection molding machines are mainly those in which conditions for measuring and kneading are set by a switch, and these conditions are displayed by this switch. Further, a display device is used to display various setting conditions of the injection molding machine by numerical values, for example, Japanese Patent Application No. 59-24.
It is developed by No. 7013.

[0003]

SUMMARY OF THE INVENTION The present invention is capable of displaying the set values of the measuring and kneading conditions such as the screw rotation speed, the back pressure and the switching position during the measuring and kneading in a graph.

[0004]

According to the present invention, the number of switching stages in the metering / kneading process, the back pressure of each stage, the screw rotation speed,
Setting means for setting the position of the switching screw, display means, a memory for storing the set value set by the setting means, a graph for displaying the set back pressure, the maximum value of the screw rotation speed and the screw back amount. Scale factor calculating means for calculating the scale factor for each set value corresponding to the maximum length of the vertical axis and the horizontal axis of the above, and the back pressure of each stage, the screw rotation speed, the switching screw position and the above-mentioned respective settings. Based on the scale factor for the value, the display means is provided with a graph display control means for displaying the relationship between the back pressure with respect to the screw position and the screw rotation speed with respect to the screw position in the same graph display area by changing the display type, and the display means is measured.・ A graph of kneading conditions was displayed at the same time.

[0005]

When the setting means sets the number of switching stages at the time of weighing / kneading, the back pressure of each stage, the screw rotation speed, and the position of the switching screw and stores them in the memory, the scale factor calculating means causes the set spin rate to be set. Scale for each stage setting value for scale conversion in correspondence with the maximum value of pressure, screw rotation speed and screw back amount which is the position of the last stage switching screw and the maximum length of the horizontal axis and vertical axis of the graph to be displayed Calculate the factor, the graph display control means calculates the position on the graph from each of the calculated scale factors and each of the set values, and changes the display type on the display means to change the screw position and each step. Display control of back pressure and screw speed graph.

[0006]

FIG. 1 is a block diagram of an embodiment of the present invention.
1 is a screw in an injection molding machine, 2 is a heating cylinder, 3 is a screw shaft connected to the screw 1,
4 is a screw rotation mechanism driven by a servo motor 6 to rotate the screw 1. 5 is an injection drive mechanism driven by the servo motor 8 to drive the screw 1 in the axial direction to cause injection. The servo circuit receives a signal from the rotary encoder 7 and controls the speed of the servo motor 6 based on a command from the control device 13. Reference numeral 11 is also a servo circuit, which controls the servo motor 8 and receives a command from the controller 13 to control the rotation speed and position of the servo motor 8 to control the injection speed and position of the screw 1.
Reference numeral 9 is an incremental encoder, which is input to the servo circuit 11 and also to the counter 17 from the control circuit 13, and the counter 17 detects the current position of the screw 1.

An analog-digital converter (hereinafter referred to as an A / D converter) 12 receives a signal from a current detector for detecting a drive current of the servo motor 8 in the servo circuit 11, converts the signal into a digital signal, and controls the control circuit. It is input to 13. The back pressure applied to the screw 1 at the time of measuring and kneading is controlled by the drive current value of the servo motor 8.

Reference numeral 13 denotes a control device, which is composed of a numerical control device having a built-in microcomputer. Reference numeral 14 is a microcomputer (hereinafter referred to as CPU) in the control device, and 16 is an input / output circuit, which outputs signals to the servo circuits 10 and 11 as well as signals from the A / D converter 12. A counter 17 counts the signals from the encoder 9 provided in the servo motor 8 to detect the position of the screw 1. Reference numeral 15 denotes a memory, which includes a ROM for storing a control program for controlling the injection molding machine, a RAM for temporarily storing data, and a non-volatile memory for storing set values of various conditions at the time of weighing and kneading. ing. 19 is a control panel with a display (hereinafter referred to as MDi &
CRT), various commands are input from the keyboard 21 on the MDi & CRT 19, and soft keys 22
Is used to display various condition setting screens on the CRT screen 20, and the keyboard 21 is used to set various conditions.

FIG. 2 shows an embodiment in which a soft key 22 is operated on the CRT screen 20 to display a setting screen for weighing / kneading conditions. When setting the weighing / kneading conditions, this screen is displayed. The number of switching stages, back pressures P1 to Pn under kneading conditions at each stage 1 to n, and screw rotation speeds V1 to Vn
The positions L1 to Ln of the screw 1 which are the switching points are set by the keyboard 21, and the screw back amount Ln, the suck back amount Ls and the cooling time Tr which are the final switching points are also set. In addition, L0, V0, P0, T0 are the screw position currently in operation, screw rotation speed, back pressure,
It represents the kneading time. When the number of switching stages, the back pressure of each stage, the number of rotations, and the switching point are set, a graph G1 showing the screw position L on the horizontal axis, the back pressure P on the vertical axis, the screw position L on the horizontal axis, and the rotation on the vertical axis. A graph G2 showing the number V is displayed.

Next, the operation of this embodiment will be described with reference to the operation flowcharts of FIGS. First,
The operator operates the soft key 22 to select the weighing / kneading condition setting screen. Then, when the number of switching steps, the back pressure of each step, the screw rotation speed, and the screw position which is the switching point are stored in the setting memory 15 using a cursor or the like, C
The PU 14 starts drawing the graphs G1 and G2 in FIG. In this process, first, when the screw back amount Ln (n stages is set) which is the switching point of the final stage of the set number of stages is set, in the example of the graphs G1 and G2 shown in FIG. Is "0" (step S1), that is, the screw back amount Ln, which is the final switching point, is "0".
Since that means that it is not set, the graph display operation is not performed in this case.

If the screw back amount Ln is not "0", the index i is set to "1" (step S2), and the back pressure P1 of the first stage set in the register R (P) is set (step S3). ), The value of the register R (P) is compared with the set i-th stage back pressure Pi (step S4). When the back pressure setting value Pi is greater than or equal to the value of the register R (P), the set back pressure value Pi is set in the register R (P) (step S5) (note that i is initially
Since P1 is set in the register R (P) when = 1, the back pressure set value Pi = P1 compared with the register R (P) is equal, so P1 is set in the register R (P) as it is. If the value of the register R (P) is larger than the i-th stage back pressure setting value Pi, the value of the register R (P) is not changed and the process directly proceeds to step S6. Step S6
Then, the index i is incremented by "1", and it is judged whether or not the index i has exceeded the set stage number n (step S7), and the processes of steps S4 to S7 are repeated until the index i is exceeded. When the index i exceeds the set stage number n, the register R (P) stores the highest back pressure at each stage set.

Next, a graph G on the CRT screen shown in FIG.
The maximum length Xn of the horizontal axis of 1 is divided by the set screw back amount Ln to calculate the scale factor Xc of the X axis (step S8). That is, the position of the final switching point Ln, which is the screw back amount, is made to coincide with the maximum point Xn on the horizontal axis of the graph G1, and the position of the screw 1 is converted to the position on the horizontal axis on the graph G1. The scale factor Xc is obtained. Next, register R (P)
Is "0" (step S9), the register R
(P) is the back pressure P set in the processing of steps S4 to S7.
Since the maximum value of 1 to Pn is stored, it means that the value of the register R (P) is "0" means the back pressures P1 to Pn.
Are all "0", and in this case, the scale factor Yc of the Y axis is set to an appropriate value, for example "1" (step S10). If the register R (P) is not "0", the maximum length Ym on the vertical axis of the graph G1 is divided by the value of the register R (P) storing the maximum back pressure to obtain the Y-axis scale factor Yc. (Step S11).

Then, the back pressure P1 of the first step is multiplied by the scale factor Yc of the Y axis to obtain the point of the Y axis on the graph G1 with respect to the set back pressure P1, and the coordinate position (0, Yc x on the graph G1. P1) point a, and then the first stage setting switching point L1 is multiplied by the scale factor Xc of the X axis to obtain the graph G1 corresponding to the position L1 of the screw 1 which means the end of the first stage. The X-axis position of the
From the Y-axis point Yc x P1 on the graph G1 corresponding to the set back pressure P1 of the step, the coordinate position {(Xc x L
1), (Yc × P1)}, the point b is obtained, and the points a and b are connected by a line and displayed (step S12).

Next, the index i is set to "2" (step S1
3) The setting change point Li-1, that is, the setting change point L1 of the first stage is multiplied by the scale factor Xc of the X axis to obtain the X axis coordinate of the end point of the first stage, and the set back pressure Pi-1. That is, the set back pressure P1 of the first stage is multiplied by the scale factor Yc of the Y-axis to obtain the Y-axis coordinate which is the end point of the first stage, and {(X
c.Li-1), (Yc.Pi-1)} = {(Xc.L
1), (Yc · P1)} at the coordinate position b, and then the previously obtained (Xc · Li-1) = (Xc · L1) coordinate position on the X axis and the set back pressure Pi, that is, The set back pressure P2 of the second stage is multiplied by the scale factor Yc to obtain the starting Y-axis coordinate position (Yc.Pi) = (Yc.P2) of the second stage, and {(Xc.Li-1), ( Yc.Pi)} = {(Xc
-L1), (Yc-P2)} is obtained at the coordinate position c, and the previously obtained points b and c are connected by a line and displayed (step S14). Next, the coordinate position of point c {(Xc Li-1
), (Yc · Pi)} = {(Xc · L1), (Yc · P)
2)} and point d, which is the end position of the second stage, are linked and displayed (step S15).

That is, since the point c has been obtained in step S14 and the Y-axis coordinate (Yc.Pi) of the point d has already been obtained, the X-axis coordinate of the point d, that is, the end point X of the second stage. The axis coordinate is obtained by multiplying the setting switching point Li = L2 by the scale factor Xc of the X axis. As a result, the coordinate position of d point {(Xc.Li), (Yc.Pi)} = {(Xc.L
2), (Yc · P2)} and the coordinates of the c point {(X
c.Li-1), (Yc.Pi)} = {(Xc.L1),
(Yc · P2)} is connected by a line and displayed (step S1).
5).

Next, "1" is added to the index i (step S
16), it is determined whether or not the index i has reached the set stage number n (step S17), and the processes of the above steps S14 to S17 are performed until the index i exceeds the set stage number n. That is, the index
When i is "3", the line connecting the points d and e is displayed in step S14, and the line connecting the points e and f is displayed in step S15. Next, when the index i becomes "4", the line connecting the f point and the g point in step S14 and the line connecting the g point and the h point in step S15 are displayed. The example shown in the graph G1 shows an example in which the number of switching steps n is four, and in the graph G1, the back pressure P1 and the switching point L1 of the first step are displayed by points a and b, and the point c The second stage at point d, the third stage at points e and f, g
The back pressure of the 4th step and the switching point are displayed at points and h. Next, when the index i exceeds n (= 4),
Coordinates of h point {(Xc.Ln), (Yc.Pn)} =
{(Xc.L4), (Yc.P4)} and j point coordinates {(Xc.Ln), 0} = {(Xc.L4), 0} are linked and displayed (step S18), and the screw L and the spine are connected. The display of the setting graph G1 of the pressure P is ended.

Next, when the display of the graph G1 is finished, as shown in FIG. 4, the index i is set to "1" again (step S19), and the graph G2 of the relationship between the screw position L and the screw rotation speed is displayed. Display processing starts. First,
The first stage set rotation speed V1 is set in the register R (V), and thereafter, the same processing as that performed in steps S4 to S7 of FIG. 3 is performed to detect the maximum value of the set rotation speed V, and the register R Store in (V).

That is, the value of the register R (V) and the index i
The set speed Vi of the i-th step indicated by is compared (step S2
1) If the i-th stage rotational speed Vi is large, the large rotational speed Vi is stored in the register R (V) (step S22), and the index i is increased by "1" (step S23). The processes of steps S21 to S24 are performed until i reaches the set step number n (= 4) (step S24). Next, the maximum length X'm on the horizontal axis of the graph G2 is set to the switching point Ln (= L) of the final stage n (= 4) which is the screw back amount.
4) to obtain the scale factor Xc of the X axis (step S25), and similarly, the maximum length Y'of the vertical axis of the graph G2 is obtained.
By dividing m by the value of the register R (V) that stores the set maximum rotation speed, the Y-axis scale factor Yc is obtained (step S26), and the scale factors Xc, Yc and the set rotation speeds V1 to Vn (= V4) are obtained. ) And set screw switching point L1
~ Ln (= L4), the same processing step S2 as steps S12 to S18 performed in the graph display processing of the graph G1.
7 to S33 are performed to display the graph G2 as a graph.

That is, the coordinate position {(0, Yc
.V1)} and the coordinate position of b'point {(Xc.L1), (Y
c · V1)} are linked and displayed (step S27), and the screw rotation speed V1 in the first stage and the switching point L1 to the second stage
Is displayed and the index i is set to "2" (step S2
9), coordinate position of b'point {(Xc.Li-1), (Yc.
Vi-1)} = {(Xc.L1), (Yc.V1)}
Coordinate position of c'point {(Xc.Li-1), (Yc.Vi)}
= {(Xc.L1), (Yc.V2)} are connected and displayed (step S29), and the coordinate position of the c'point {(Xc.L.
1), (Yc.V2)} and the coordinate position of the d'point {(Xc.V.
Li), (Yc.Vi)} = {(Xc.L2), (Yc
.V2)} are linked and displayed (step S30), the index i is then increased by "1" and the same processing is performed (step S29,
S30) is performed, and d'point, e'point, f'point, g'point,
The h'points are sequentially connected and displayed, and the index i is the number of steps n (= 4)
(Step S32), the h'point {(Xc.Ln
), (Yc.Vn)} = {(Xc.L4), (Yc.
V4)} and j'point {(Xc.Ln), 0} = {(Xc.
L4), 0} are linked and displayed (step S33), and the display of the graph G2 that displays the relationship between the set screw position and the screw rotation speed is terminated.

As a result, in graph G2, from point a'to b '
The set screw speed of the 1st stage and the position of the switching screw to the 2nd stage are indicated by the points, the 2nd stage by the points c'to d ', the 3rd stage by the points e'to f', and the point g '. From the point h ', the set screw rotation number and the switching screw position of the fourth stage are displayed.

Then, the graphs G1 and G2 are used to graphically display the set number of stages in weighing and kneading, the back pressure of each stage, the screw rotation speed, and the position of the screw for switching to the next stage. It is easy to find mistakes.

In the above embodiment, the graphs G1 and G2 are
Although the display position of was changed and the weighing / kneading setting conditions were displayed,
The back pressure and the screw rotation speed may be displayed at the same position, that is, one graph. In this case, if the back pressure and the screw rotation speed are displayed in different colors by using a color display, the back pressure and the screw rotation speed can be displayed more clearly. it can.

[0023]

As described above, according to the present invention, the number of switching stages in metering and kneading, the back pressure of each stage, the screw rotation speed, and the set value of the switching screw position are displayed in a graph, and the screw rotation speed with respect to the screw position is displayed. Graph and back pressure graph for screw position are displayed in different places by overlapping the display type, so you can easily and easily find any error in the set values during weighing and kneading, and set reliable weighing and kneading conditions. You can

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is an example of a display screen in the embodiment.

FIG. 3 is an operation processing flowchart in the embodiment.

FIG. 4 is a continuation of the flowchart of FIG.

[Explanation of symbols]

 1 Screw 2 Heating Cylinder 6,8 Servo Motor 7,8 Encoder 13 Controller 19 MDi & CRT

Claims (2)

[Claims] 1. Setting means for setting the number of switching stages, back pressure of each stage, screw rotation speed, and switching screw position in the weighing / kneading process, display means, and memory for storing the set values set by the setting means. And a scale factor calculating means for calculating a scale factor for each set value corresponding to the maximum length of the vertical axis and the horizontal axis of the graph displaying the set back pressure, the maximum value of the screw rotation speed and the screw back amount. Based on the set back pressure, screw rotation speed, switching screw position, and scale factor for each set value, the display means displays the relationship between the back pressure for the screw position and the screw rotation speed for the screw position. A graph display control means for changing and displaying both in the same graph display area is provided, and the measuring and kneading conditions are displayed on the display means. An injection molding machine designed to display. 2. The weighing / kneading condition according to claim 1, wherein a graph of the back pressure and the screw rotational speed is displayed by differentiating the colors of the graphs to be displayed from the graphs. Injection molding machine.