JPH03114647A - Monitor display method for injection characteristic - Google Patents

Abstract

PURPOSE:To improve the working efficiency and to acquire the working of high accuracy by displaying the completely filling position for injection and shifting the unit indication of time being the reference axis to indicate the route with this position as reference or changeover displaying an other function from the function one of the injection system parameter. CONSTITUTION:The molten aluminium 15 is pushed in the cavity 11 following to the advancing the plunger tip 9 and by shutting the gas vent valve 21 to report that the injecting and filling in the cavity 11 of the molten aluminium 15 is completed, this operation signal (a) is inputted in the monitor device and the line is displayed. The position of this line is the position to shut the gas vent valve 21, and is also the position to indicate that this is the position near the limit of advancing of the plunger tip 9 of the side axis to be reference axis. Therefore, the shutting position of gas vent valve 21 is always displayed accurately. Therefore, when the shifting of the indicating unit system of the axis of abscissa to be the reference axis of the locus display or the shifting of the time unit are executed, the comparing is freely executed and the study work is efficiently executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of monitoring injection characteristics of a die-casting machine and a method of displaying the monitored data.

[Conventional technology] When displaying injection system parameters that determine the quality of a molded product, such as pressure, The display was switching between a position function and a time function.

[Problems to be Solved by the Invention] FIG. 5 shows the injection speed characteristics and injection pressure characteristics of a die-casting machine as a function of time with the horizontal axis serving as a reference axis.

In FIG. 5, ■ is the moving speed of the injection cylinder, and P is the oil pressure applied to the head side of the injection cylinder, which is used as the injection pressure.

FIG. 6 shows the injection speed characteristics and injection pressure characteristics shown in FIG. 5 as a function of the position of the cylinder with the horizontal axis serving as the reference axis.

The display method shown in Figure 5 matches human sensation, but the length of the horizontal axis, which is the reference axis, is directly affected by the magnitude of the injection speed, and display media such as CRTs have a certain length. When displaying in

Therefore, resolution is generally secured by partial enlargement and partial reduction functions.

However, the display method using partial enlargement and partial reduction functions not only inefficiently displays and examines work, but also displays two or more injection characteristics (injection characteristics of two or more different jets) at the same time for comparative analysis. There is a problem in that the work becomes extremely difficult.

In addition, in the display method shown in Fig. 6, unlike the display method shown in Fig. 5, the height of the injection speed does not affect the length of the horizontal axis, which is the reference axis. This is good for displaying speed characteristics, but if you focus on the injection pressure characteristics P shown in Figure 5, when the injection cylinder has hardly moved, it will be difficult to display the injection pressure characteristics from the latter half of Figure 5 onwards. can no longer be displayed.

In order to compensate for these drawbacks, the display method shown in Figure 7 generally displays the time function from the point when the injection cylinder hardly moves, that is, after the line 40 in Figure 7. ing.

In this method of displaying the horizontal axis, which is the reference axis, using the function of the cylinder position and the function of time, as shown in Fig. 7, it is difficult to determine the switching point between the function of the cylinder position and the function of time. This method has the disadvantage that it greatly affects the function of the monitor and the efficiency of examination work using the monitor.

[Means for Solving the Problems] In order to solve these problems, in the present invention, the parameters of the injection system that determine the quality of the molded product, such as pressure, temperature, and speed, are changed as a function of time and the injection system. In a monitor device that displays the injection filling completion position as a function of a parameter or as a function of time by switching from a function of one of the parameters of the injection system to a function of time, the injection filling completion position is displayed and the trajectory is displayed using this position as a reference. The unit display of time, which is the reference axis of the injection system, was changed, or the injection system parameters were switched from one function to another.

[Function] In the monitor display method according to the present invention, it is possible to improve work efficiency and precision.

[Example] Figs. 1 to 3 show an embodiment of the injection characteristic monitor according to the present invention. Fig. 1 is a system diagram for explaining an embodiment of the injection characteristic monitoring device, and Fig. An explanatory diagram of the injection process in the aluminum casting process using a die-casting machine. Figure 3 is an example of the injection characteristics shown in a system diagram to explain the embodiment shown in Figure 1. Figure 4 shows the gas used in Figure 1. It is a longitudinal cross-sectional view showing an example of a vent valve.

FIG. 1 is a system diagram for explaining an embodiment of an injection characteristic monitoring device according to the present invention.

In Fig. 1, 1 is an injection cylinder, 2 is a piston,
3 is a coupling, 4 is a plunger, 5 is a striker,
6 is a position detection sensor, 7 is a ladle, 8 is a spout, 9 is a plunger tip, 10 is an injection sleeve, 11 is a cavity, 12.13 is a mold, 14 is a pressure liquid supply port, 15 is molten aluminum, 16 is A pressure sensor, 20 a monitor device, and 21 a gas vent valve.

A plunger 4 is connected to the piston 2 of the injection cylinder 1 via a coupling 3, and a plunger tip 9 is attached to the tip thereof. Also, a striker 5 for detecting the position of the piston 2 via the coupling 3 is assembled.

The piston 2 moves to the left in FIG. 1 by being supplied with pressure fluid from a pressure supply source (not shown) through the pressure fluid supply port 14 of the injection cylinder 1.

Molten aluminum 15, which is a molding material, is poured into the pouring port 8 of the injection sleeve 10 using a ladle 7, and as the piston 2 moves, the molten aluminum 15 is poured into the cavity 11 formed by the molds 12 and 13 through the plunger tip 9. It is pressed and molded.

In FIG. 1, a gas vent valve (GF valve) 21 is installed in the upper part of the molds 12 and 13. The gas vent valve 21 is a valve designed to automatically close the aluminum flow path due to the inertia of the molten aluminum.

The injection process, injection speed, and injection pressure in aluminum casting using the die cast 11 will be explained with reference to FIG.

FIG. 2(a) shows the initial state of the molding process,
This shows a state in which molten aluminum 15 is being poured from the pouring port 8. When the pouring shown in FIG. 2(a) is completed, the machine control device (not shown) enters an injection start operation and sends the pressurized liquid to the pressurized liquid supply port 14 of the injection cylinder 1.

Next, as shown in FIG. 2(b), as a result of the pressure liquid being fed into the pressure liquid supply port 14 of the injection cylinder 1, the piston 2 moves to the left in the figure, and as a result, the molten aluminum 15 is injected. It moves towards the left side of the sleeve 10, ie towards the mold 12.13, and fills the injection sleeve 10. In addition, the completion of this sleeve filling is detected by a striker 5 and a position detection sensor 6 attached via a coupling 3, and a pressure sensor 16 attached to measure the oil pressure acting on the injection cylinder 1. However, it is detected and sent to a machine control device (not shown). Note that the above-mentioned detection of the sleeve filling completion position depends on the shape of the injection sleeve 10 and the mold 12, 13 and the molten aluminum 1.
The position detection sensor 6, which is determined at the front of the vehicle by the quantity 5, is installed according to the position.

Next, as shown in FIG. 2(C), after filling the sleeve in FIG. 2(b), the pressure liquid supply port 14 of the injection cylinder 1 is
As a result of the pressure fluid being fed into the piston 2, the piston 2 further moves to the left, and the molten aluminum 15 is filled into the cavity 11 formed by the mold 12.13. In this way, the completion of injection filling can be known by the closing of the gas vent valve 21, as in FIG. 2(b).

FIG. 4 shows an example of the gas vent valve 21 in Utility Application No. 61-1.
16775 is a longitudinal cross-sectional view showing what is described in No. 16775.

In FIG. 4, 30 is a fixed mold, 31 is a discharge port, and 32
33 is a gas vent groove, 34 is a valve body, and 35 is a port. In this gas vent valve, the gas from the gas vent groove 33 is discharged from the exhaust port 31;
The molten metal from 3 is blocked by the valve body 34 and is not discharged.

That is, as the molten metal rises from the gas vent groove 33, the valve rod 32 rises. Therefore, by detecting the rise of the valve stem 32, completion of injection filling can be detected. As an example of a method for detecting the valve stem 32,
1-116775, port 3
5 and a pressure supply source (not shown) are connected by piping, and the valve stem 32
There is a method of detecting the pressure in the port 35 that changes due to the rise in the pressure and extracting this as an electrical signal. Another method is to detect the rise of the valve stem 32 using an electric switch (not shown). In any case, it is sufficient if the change in the valve stem 32 can be extracted as an electrical signal.

As described above, the molten aluminum 15 filled in the cavity 11 is cooled under pressure by the force of the pressure fluid applied to the piston 2, and the molding is completed.

In order to monitor the injection characteristics described above, the actuation signal a of the gas vent valve 21 is set as shown in FIG.

Signal from position detection sensor 6 and pressure sensor 1
The signal C from 6 can be taken into the monitor device 20.

FIG. 3 is a locus diagram when the injection pressure P and injection speed V in aluminum casting by a die-casting machine are displayed using the monitor device for displaying injection characteristics shown in FIG.

In the trajectory diagram of FIG. 2, a line 50 perpendicular to the horizontal axis, which is the reference axis, is connected to the input signal of the closing signal a from the gas vent valve 21.
By displaying , you can easily determine that a parameter has been switched.

That is, as the plunger tip 9 moves forward, the molten aluminum 15 is pushed into the cavity 11, and as described above, the degassing valve 21, which signals the completion of injection and filling of the molten aluminum 15 into the cavity 11, is closed, and this actuation signal is activated. a is taken into the monitor device and a line 50 is displayed. The position of this line 50 is the position where the gas vent valve 21 is closed, and is also the position indicating that the plunger tip 9 is near the forward limit position on the horizontal axis, which is the reference axis in FIG.

In this way, when manufacturing a large quantity of the same molded product using a die-casting machine, the position where the gas vent valve 21 closes, that is, the line 50, can be constantly and accurately displayed.

Therefore, even if you change the display unit system of the horizontal axis, which is the reference axis in the desired locus display, or change the unit time, the line 5
Comparisons can be made freely using 0 as a reference, and examination work can be carried out efficiently.

[Effects of the Invention] As explained above, in the past, it was not possible to accurately determine when filling a cavity with molten aluminum or the like was completed, but in the present invention, the completion of filling a cavity can be accurately detected by using a gas vent valve. By using it to switch the display unit system of the horizontal axis, which is the reference axis in trajectory display, and to switch the unit time, it greatly helps to improve the efficiency of comparing and examining factors that affect the manufacturing conditions of the desired molded product. A good study can be carried out.

[Brief explanation of drawings]

1 to 3 show an embodiment of the injection characteristic monitor according to the present invention, FIG. 1 is a system diagram for explaining an embodiment of the injection characteristic monitoring device, and FIGS. An explanatory diagram of the injection process in the aluminum casting process. Figure 3 is an example of the injection characteristics shown in a system diagram to explain the embodiment shown in Figure 1. Figure 4 is an illustration of the gas vent valve used in Figure 1. It is a longitudinal cross-sectional view showing an example. 5 to 7 show other embodiments similar to the present invention, FIG. 5 is an example in which injection characteristics in a die-casting machine are displayed as a time parameter, which is a conventional technique, and FIG. An example of the trajectory diagram shown in Figure 7 in which the horizontal axis, which is the reference axis, is displayed as a parameter for the cylinder position. An example is shown in which the horizontal axis is switched from the cylinder position parameter to the time parameter. 50...Switching line, a, b, c...signal.

Claims (1)

[Claims] (1) Injection system parameters that determine the quality of molded products, such as pressure, temperature, and speed, as a function of time or as a function of one of the injection system parameters, or as a function of time from one function of the injection system parameters On a monitor device that displays the trajectory in the form of a track, display the injection filling completion position and change the time unit display, which is the reference axis of the trajectory display, based on this injection filling completion position, or change the injection system. 1. A monitor display method for injection characteristics, characterized in that the display is switched from one function of a parameter to another function.