JP2001315164A - Method and apparatus for pre-maintaining injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus capable of monitoring a change state of a detected value of a specific detector of a plurality of detectors provided in an injection molding machine body in a long span of a month unit. SOLUTION: The apparatus for preventively maintaining the injection molding machine comprises a cushion position detector for changing a detected value due to an aging change of a screw head or a heating cylinder needing an alteration of molding conditions or a replacement of a component owing to its wear. A controller 12 samples the detected value of the detector in a period set by a keyboard 13, stores the value in a memory 15, and displays the sampled detected value on a display 14 so as to understand the change state in a span of one month or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an injection molding machine,
In particular, among the plurality of detectors provided in the injection molding machine main body,
The present invention relates to a method and an apparatus for monitoring a change state of a detection value at a specific detector in a long span of a month.

[0002]

2. Description of the Related Art In general, an injection molding machine is provided with a data logging function, and a pressure (for example, a mold clamping pressure, an injection pressure, a holding pressure, a resin pressure in a mold, a resin pressure of a heating cylinder head, etc.). ), Speed (eg, screw speed, mold clamping speed, injection speed, etc.), temperature (eg, heating cylinder temperature, resin temperature in the heating cylinder, resin temperature in the mold, etc.), position (eg, screw position in the heating cylinder, Mold position)
The necessary data can be logged for each shot over a wide variety of fields.

That is, necessary detection values among the above-described various detectors are recorded by a printer as logging data for each shot, or stored in a storage device. FIG. 2 shows an example of recording by a printer.

[0004]

By the way, of the plurality of detectors described above, the detection value of which changes due to a change in molding conditions or a part requiring replacement of parts due to wear with time is detected. There is a vessel. For example, the cushion position changes due to wear of the screw head and the heating cylinder. The cushion position can be known from the value detected by the screw position detector. In any case, the operator changes the molding conditions by ascertaining the state of change in the cushion position, or replaces a component such as a screw head. Data relating to such replacement of parts is also called so-called pre-maintenance data.

[0005] However, the change in the detected value due to wear is as follows.
Since it appears after a long period of one month or two months, to see the range of change, for example, once a week,
The judgment is made by looking at the logging data as shown in FIG. 2, and the workability is very poor.

Accordingly, an object of the present invention is to provide a method for monitoring a change state of a detected value in a specific detector among a plurality of detectors provided in an injection molding machine main body over a long span of a month. And a device.

[0007]

According to the present invention, of a plurality of detectors installed in an injection molding machine, a change in molding conditions due to abrasion or a change with time of a part requiring replacement of a part is caused. Select a detector whose detected value changes by sampling in advance, sample and store the detected value of the selected detector at intervals of several days or more, and change the sampled detected value over a span of one month or more. A pre-maintenance method for an injection molding machine characterized by displaying on a display so that the situation can be understood is obtained.

According to the present invention, at least one detector whose detected value changes due to a change with time in a part requiring change of molding conditions or replacement of parts due to wear, and at least one detector obtained from the detector. A control unit for sampling the detection value at a cycle of several days or more, a storage unit for storing the sampled detection value, a setting unit for setting the sampling cycle, and a display, The unit samples the detected value of the detector at a cycle set by the setting unit and stores the sampled value in the storage unit. , A pre-maintenance device in the injection molding machine is obtained.

The control section may display a warning or notify a warning on the display when the change width of the sampled detection value exceeds a predetermined value.

[0010] Further, by providing a recording means, the control unit may cause the recording means to record the sampled detection value.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a pre-maintenance device according to the present invention can be realized by a well-known configuration provided in an injection molding machine. That is, the injection molding machine usually includes a control device 12 for controlling the molding operation of the injection molding machine main body 11, a keyboard (setting unit) 13 for inputting and changing various set values, and a molding condition and the like. ,
A display 14 for displaying, for example, a pressure waveform, a velocity waveform, and the like in each process during molding based on detection signals from various detectors installed in the injection molding machine main body 11,
A storage device 15 and a printer 16 for printing out logging data are provided.

As described above, in the case of an electric injection molding machine, a pressure detector for detecting a mold clamping pressure or a strain detector, and a detector for detecting an injection pressure and a holding pressure are used. Load cell, resin pressure detector in the mold to detect resin pressure in the mold, resin pressure detector in the cylinder head to detect resin pressure in the heating cylinder head, weighing to detect screw rotation speed Speed detector installed in the motor, speed detector installed in the injection motor to detect the injection speed, temperature detector to detect the heating cylinder temperature, resin to detect the resin temperature in the heating cylinder There are a temperature detector, a position detector for detecting the screw position in the heating cylinder, and the like, all of which are not shown.

In the present embodiment, among the above-mentioned detectors, a screw position detector whose detection value changes due to a temporal change of a screw head or a heating cylinder which requires changing of molding conditions or replacement of parts due to wear. An apparatus for performing pre-maintenance based on the cushion position obtained from the above will be described.

The control device 12 samples the cushion position obtained from the screw position detector at a cycle of several days or more (for example, 7 days), and stores the sampled cushion position in the storage device 15. That is, only one detected value of the cushion position shown in FIG. 2 is sampled for each specific cycle. The specific cycle of the sampling can be arbitrarily set from the keyboard 13. The control device 12 samples the sampled value of the cushion position at a cycle set by the keyboard 13 and stores the sampled value in the storage device 15. The control device 12 also receives an instruction from the operator through the keyboard 13,
The cushion position sampled in the past is displayed on the display 14 in, for example, a line graph format so that the change status can be understood in a span of one month or more.

Thus, the operator can see the change in the cushion position over one month or more by looking at the line graph displayed on the display 14 and, based on the change width, the necessity of replacing the screw head and the heating cylinder. Can be determined.

Of course, without waiting for an instruction from the operator,
If the change width of the sampled cushion position exceeds a predetermined value, the controller 12
Warning display, or alarm notification by an alarm, voice, or the like.

The controller 12 also outputs the sampled cushion position data and the above-mentioned line graph to the printer 1.
5 can be printed out.

As described above, in the pre-maintenance apparatus according to the present embodiment, the sampling timing can be set not by the number of shots but by the period, and the change of the sampling value can be set to one.
The feature is that it can be seen over a long span of more than a month.

Since various kinds of wear can be considered in the case of a mold or an injection molding machine, the data to be sampled determines where the change can be used for monitoring wear. However, the display method and the like are the same no matter where the wear is, so that various changes can be made depending on the usage.

[0020]

According to the present invention, a change state of a detection value of a specific detector among a plurality of detectors provided in an injection molding machine can be monitored over a long span of a month, so that a molding condition changing operation can be performed. Can be easily determined.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a pre-maintenance device according to the present invention.

FIG. 2 is a diagram illustrating a printout example of logging data.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 injection molding machine main body 12 control device 13 keyboard 14 display 15 storage device 16 printer

Claims (4)

[Claims] 1. Among a plurality of detectors installed in an injection molding machine, a detector whose detection value changes due to a change with time in a part requiring change of molding conditions or replacement of parts due to wear is determined in advance. Select and store the detected value of the selected detector at intervals of several days or more,
A pre-maintenance method for an injection molding machine, characterized in that a sampled detection value is displayed on a display so that a change state can be recognized in a span of one month or more. 2. At least one detector whose detection value changes due to a change over time in a part where a change in molding conditions or replacement of a part is required due to wear, and a detection value obtained from the detector is changed for several days. A control unit for sampling at the above cycle, a storage unit for storing the sampled detection value, a setting unit for setting the sampling cycle, and a display, wherein the control unit The detected value of the container is sampled at the cycle set by the setting unit and stored in the storage unit, and the sampled detected value is displayed on the display so that the change status can be understood in a span of one month or more. Pre-maintenance equipment for injection molding machines. 3. The pre-maintenance apparatus according to claim 2, wherein the control unit performs a warning display or a warning notification on the display when a change width of the sampled detection value exceeds a predetermined value. Pre-maintenance equipment in injection molding machines. 4. The pre-maintenance apparatus according to claim 2, further comprising a recording unit, wherein the control unit records the sampled detection value by the recording unit. apparatus.