JPH08216215A - Monitor display of injection molding machine - Google Patents

Abstract

PURPOSE: To produce a satisfactory molding by displaying the control state of separate steps such as concurrently operating die clamping step and excitation step with an injection step, on the screen of one monitor, and clarifying the interrelative status between these steps to prevent an error in the control of the separate steps from occurring. CONSTITUTION: A reference screw position axis 1 is given as a horizontal axis in the filling stage of the injection step of an injection molding machine with an injection compression function, and a reference time axis 2 is given as a horizontal axis in a pressure retaining step of the machine. On the other hand, injection molding conditional axes 3, 4 in the injection step and a die clamping conditional axis 5 in a die clamping step are given as vertical axes. Thus the variations of injection molding conditional and die clamping conditional wave- forms are displayed on one injection process monitor screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor display method for an injection molding machine, and more particularly to a monitor display method for an injection molding machine or a magnetic field injection molding machine having an injection compression function.

[0002]

2. Description of the Related Art Usually, an injection process comprises a filling process and a pressure-holding process. In the filling process, the injection speed is controlled based on the screw position, and in the pressure-holding process, the injection pressure is controlled based on time. Therefore, in the monitor display method of the injection process, the position reference axis is used in the filling process, the time reference axis is used in the pressure holding process as the horizontal axis, and the injection molding conditions such as injection speed and injection pressure are used as the vertical axis to fill the injection molding conditions. The process is continuously displayed from the pressure-holding process. The switching from the filling process to the pressure holding process is usually performed on the basis of position.

In the monitor display method of the injection process described in Japanese Patent Publication No. 2-49893, as shown in FIG. 3, injection molding conditions such as injection speed (v) and filling force (F) are set. Then, the stroke (position) reference axis and the time reference axis from the switching point from the filling step to the pressure holding step are represented by the time reference axis, and the molding conditions represented by this time reference axis are started from the mechanical limit position 0 of the injection screw. Synthesized display.

As described above, in the conventional monitor display method for the injection process, the injection speed, the injection pressure, etc., which are the injection molding conditions in the injection process, are displayed on the monitor screen.
Another process that is proceeding at the same time as the injection process, for example, the mold clamping condition of the mold clamping process in the injection molding machine having the injection compression function or the excitation condition of the excitation process in the magnetic field injection molding machine is displayed by numerical values.

[0005]

The control of the mold clamping process of the injection molding machine having the injection compression function or the control of the excitation process of the magnetic field injection molding machine described above is performed during the injection process, especially the pressure-holding process control. So, in the conventional numerical display,
The setting of the mold clamping condition or the excitation condition is easily influenced by experience, and it has been extremely difficult to find the optimum condition.

For example, the mold clamping force as the mold clamping condition is conventionally displayed as a numerical value, but it is not possible to accurately display how the mold clamping force is controlled during the injection process. could not. That is, in order to accurately confirm which point in the injection process is the point at which the mold clamping conditions are switched,
The only way to measure it was to connect a measuring device. The same applies to the exciting current and the strength of the magnetic field as the exciting conditions.

As described above, the injection process such as the filling process for injecting the resin melted in the injection cylinder into the mold to solidify it, the pressure holding process, the cooling process and the like are performed simultaneously with the mold clamping process or the excitation process. However, because one is a monitor screen display and the other is a numerical display, it was not possible to perform injection molding work while accurately grasping the mutual relationship.

The present invention has been made in view of the above problems, and an object of the present invention is to control another process such as a mold clamping process and an exciting process which are in progress simultaneously with the injection process. The purpose of this is to display the situation on the same monitor screen, clarify the relationship between the two, prevent the control error of the different process in advance, and mold a good molded product.

[0009]

According to a monitor display method of an injection molding machine according to the present invention, a screw position reference axis is set in a filling step and a time reference axis is set in a pressure holding step in an injection step of an injection molding machine having an injection compression function. With the axis as the axis and the vertical axis as the injection molding condition axis in the injection process and the mold clamping condition axis in the mold clamping process, the changes in the waveforms of the injection molding condition and the mold clamping condition are displayed on the same injection process monitor screen. And

More specifically, the mold clamping condition is a mold clamping force.

According to the monitor display method of the injection molding machine according to the present invention, the screw position reference axis is used in the filling step in the injection step of the magnetic field injection molding machine, and the time reference axis is the horizontal axis in the pressure holding step, and the injection molding condition axis in the injection step is used. Also, with the excitation condition axis of the excitation process as the vertical axis, changes in the waveforms of the injection molding condition and the excitation condition are displayed on the same injection process monitor screen.

More specifically, the exciting condition is an exciting current.

More specifically, the excitation condition is the strength of the magnetic field.

More specifically, the injection molding conditions are screw speed and injection cylinder pressure.

[0015]

[Operation] On the monitor display of the injection molding machine having the injection compression function, the change of the screw speed waveform which is the injection molding condition in the injection process, the injection cylinder pressure waveform, and the mold clamping force waveform which is the compression condition in the mold clamping process. Is displayed on the same process monitor screen. Also, on the monitor display of the magnetic field injection molding machine, changes in the screw speed waveform, which is the injection molding condition in the injection process, the cylinder pressure waveform, and the excitation current and magnetic field strength waveform, which are the excitation conditions in the excitation process, are the same process. Displayed on the monitor screen.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a monitor display method for an injection molding machine according to the present invention will be described below with reference to the drawings. (Embodiment 1) This embodiment relates to a monitor display of injection molding conditions in an injection process of an injection molding machine having an injection compression function and mold clamping conditions in a mold clamping process.

The mold clamping process control is to prevent warpage and sink marks of the molded product by changing the mold clamping conditions during the injection process, especially the pressure holding process. The mold clamping force, which is one of the mold clamping conditions, can be obtained by measuring the stress change of the mold clamping mechanism, measuring the pressure of the mold clamping cylinder, or calculating from the crosshead position.

In FIG. 1, the horizontal axis represents the screw position reference axis 1 indicating the screw position in the filling process of the injection process, where the screw most advanced position is 0, and the screw most advanced position 0.
From the pressure-holding step (including the cooling step) on the same line. The most advanced position 0 of the screw and the holding pressure switching position 9 are shown on the vertical axis.

On the other hand, the vertical axis represents the screw speed axis 3 indicating the screw speed which is the injection molding condition in the injection process, the injection cylinder pressure axis 4 indicating the injection cylinder pressure, and the mold clamping force which represents the mold clamping force which is the mold clamping condition. It is a plurality of axes such as the axis 5. In addition to the above, the injection molding conditions include injection acceleration and molding material temperature. In addition to the above, the mold clamping conditions include the mold clamping cylinder pressure and the like. It should be noted that by displaying the time base axis during the cooling process, changes in the mold clamping force during cooling can also be displayed.

On the injection process monitor screen thus constructed, during the filling process of the injection process, the screw speed waveform 6 which is the injection molding condition, the injection cylinder pressure waveform 7 and the mold clamping force which is the mold clamping condition. The change of the waveform 8 is displayed with respect to the screw position. When the pressure-holding process is started after passing through the pressure-holding switching position 9, changes in the screw speed waveform 10, the injection cylinder pressure waveform 11, and the mold clamping force waveform 12 are displayed with respect to the elapsed time. The monitor screen displays the initial mold clamping force, the mold clamping force switching conditions, the mold clamping set values after the second stage, the pressure holding time, and the like for the mold clamping force waveforms 8 and 12. (Embodiment 2) This embodiment relates to a monitor display of injection molding conditions of an injection process of a magnetic field injection molding machine and excitation conditions of an excitation process.

The magnetic field injection molding machine is equipped with a magnetic field generator by an exciting coil in the mold clamping device in order to injection-mold a mixed material of anisotropic magnetic powder and resin in a magnetic field to mold an anisotropic plastic magnet. It is a thing. The excitation process control is to control the excitation condition during the injection process when the anisotropic plastic magnet is molded to improve the magnetic characteristics of the molded product. The excitation process includes a resting operation and a demagnetizing operation in addition to the magnetizing operation for orienting the resin that constitutes the product.

In FIG. 1, the horizontal axis represents the screw position reference axis 1 indicating the screw position in the filling process of the injection process, where the screw most advanced position is 0, and the screw most advanced position 0.
From the pressure-holding step (including the cooling step) on the same line. The most advanced position 0 of the screw and the holding pressure switching position 9 are shown on the vertical axis.

On the other hand, the vertical axis represents the screw speed axis 3 indicating the screw speed, which is the injection molding condition in the injection process, the injection cylinder pressure axis 4 indicating the injection cylinder pressure, and the exciting current axis, which indicates the exciting coil current value that is the exciting condition. It has multiple axes such as 13. In addition to the above, the injection molding conditions include injection acceleration and the temperature of the molding material. In addition to the above, the excitation conditions include the strength of the magnetic field. The strength of this magnetic field may be the strength of the magnetic field in the cavity of the mold or the strength of the magnetic field on the magnetic path. By displaying the time base axis during the cooling process, it is possible to display changes in the exciting current during cooling.

In the injection process monitor screen thus constructed, during the filling process of the injection process, the screw speed waveform 6 which is the injection molding condition, the injection cylinder pressure waveform 7 and the exciting current waveform 14 which is the exciting condition. The state of change of is displayed for the screw position. When the pressure-holding process is started after passing through the pressure-holding switching position 9, changes in the screw speed waveform 10, the injection cylinder pressure waveform 11, and the exciting current waveform 15 are displayed with respect to the elapsed time. Incidentally, on the monitor screen, regarding the excitation current waveforms 14 and 15, the excitation time, the excitation current value, the rest time, the demagnetization time,
It is also possible to display the demagnetization current value and the like.

[0025]

Since the present invention is constructed as described above, the following effects can be obtained.

On the monitor display of the injection molding machine having the injection compression function, the influence of the mold clamping condition of the mold clamping process on the injection molding condition of the injection process is accurately grasped, and the setting error of the mold clamping condition is prevented. As a result, a good molded product can be molded.

On the monitor display of the magnetic field injection molding machine, the influence of the excitation condition of the excitation process on the injection molding condition of the injection process can be accurately grasped, and the mistaken setting of the excitation condition can be prevented in advance to obtain a good molded product. Can be molded.

[Brief description of drawings]

FIG. 1 is a diagram showing an injection process monitor screen of an injection molding machine having an injection compression function.

FIG. 2 is a diagram showing an injection process monitor screen of the magnetic field injection molding machine.

FIG. 3 is a diagram showing a monitor screen of injection molding conditions of a conventional injection molding machine.

[Explanation of symbols]

 1 Screw position reference axis 2 Time reference axis 3 Screw speed axis (injection molding condition axis) 4 Injection cylinder pressure axis (injection molding condition axis) 5 Mold clamping force axis (mold clamping condition axis) 6,10 Screw speed waveform 7,11 Injection cylinder pressure waveform 8, 12 Mold clamping force waveform 9 Holding pressure switching position 13 Excitation current axis (excitation condition axis) 14, 15 Excitation current waveform

Claims (6)

[Claims] 1. A screw position reference shaft (1) in a filling process in an injection process of an injection molding machine having an injection compression function,
In the pressure holding process, the time reference axis (2) is the horizontal axis, the injection molding condition axis (3, 4) of the injection process and the mold clamping condition axis (5) of the mold clamping process are the vertical axes, and the injection molding condition and the mold clamping are performed. A method for displaying a monitor on an injection molding machine, characterized in that the change in the condition waveform is displayed on the same injection process monitor screen. 2. The monitor display method for an injection molding machine according to claim 1, wherein the mold clamping condition is a mold clamping force. 3. A screw position reference axis (1) in the filling step in the injection step of the magnetic field injection molding machine and a time reference axis (2) in the pressure holding step as the horizontal axis, and injection molding condition axes (3, 4) in the injection step. ) And the excitation condition axis (13) of the excitation process as the vertical axis, the change display of the injection molding condition and the excitation condition is displayed on the same injection process monitor screen. . 4. The monitor display method for an injection molding machine according to claim 3, wherein the excitation condition is an excitation current. 5. The monitor display method for an injection molding machine according to claim 3, wherein the excitation condition is a magnetic field strength. 6. The injection molding condition is screw speed and injection cylinder pressure.
5. The monitor display method of the injection molding machine according to any one of 5 above.