JP2862367B2 - Automatic stopping method of injection molding machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for automatically stopping an injection molding machine.

2. Description of the Related Art Conventionally, when the operation of an injection molding machine is controlled by a control device, the control device monitors the operating state of the molding machine and automatically stops the molding machine when an abnormality occurs.

[Problems to be Solved by the Invention] However, in the above-described automatic stop operation by the conventional control device, the molding machine is immediately stopped at the same time as the occurrence of the abnormality, regardless of the content of the abnormality that has occurred.

For this reason, when all the abnormalities occur, a large amount of material remains and solidifies in the heating cylinder of the injection device that has been automatically stopped. Therefore, at the time of re-operation after abnormal repair,
It is necessary to remove the solidified material in the heating cylinder, which involves great difficulty.

SUMMARY OF THE INVENTION It is an object of the present invention to automatically stop a molding machine in a state where restarting is possible as much as possible when an abnormality occurs in the molding machine.

[Means for Solving the Problems] The present invention according to claim 1 is a method for automatically stopping an injection molding machine, the operation of which is controlled by a control device, wherein the control device monitors an operating state of the molding machine, and (A) Immediately stop the molding machine according to the abnormality content classified in advance,
(B) stop the molding machine by injecting only the material being measured;
(C) Three types of automatic stop operations of injecting all the materials in the heating cylinder and stopping the molding machine are performed.

According to a second aspect of the present invention, when the control device performs each of the automatic stop operations, the control device stops the attached equipment of the molding machine.

[Operation] According to the present invention, the following operation is provided.

If the content of the abnormality is urgent or moderate, the molding machine is immediately stopped or the molding machine is stopped by injecting only the material being measured. If it is, stop the molding machine by injecting all the material in the heating cylinder. Therefore, when an abnormality with low urgency occurs, the molding machine can be automatically stopped in a state in which the material in the heating cylinder does not remain and solidify and is easily restarted.

According to the second aspect of the present invention, the following operations are provided.

When an abnormality occurs, not only the molding machine is automatically stopped but also the auxiliary equipment is automatically stopped, so that the molding machine and the auxiliary equipment can be easily restarted.

FIG. 1 is a control system diagram showing an injection molding machine to which the present invention is applied.

The injection molding machine 10 shown in FIG. 1 has a screw-in-line type injection device 11. In FIG. 1, 12 is an injection cylinder, 13 is a heating cylinder, 14 is a screw, 15 is a screw drive gear train, and 16 is a hopper. Reference numeral 17 denotes a mold, and reference numeral 18 denotes a moving cylinder for the injection device 11.

In FIG. 1, reference numeral 12A denotes an injection cylinder driving unit,
4A is a screw drive unit, 17A is a mold clamping drive unit, and each drive unit 12A, 14A, 17A is driven by a hydraulic pump unit 19.

The injection molding machine 10 has a main controller 20. The main controller 20 is connected to the molding machine controller 21 via
The operation of the injection molding machine 10 is controlled. In addition, main controller 20
Via an auxiliary equipment controller 22, a cooling fan 13A of a heating cylinder 13, an opening / closing valve 16V of a hopper 16, a temperature controller 17A of a mold 17, an automatic color changer, which is an auxiliary equipment of the injection molding machine 10, via an auxiliary equipment controller 22.
23. Control the operation of the molded product unloader 24 and the like.

In addition, the main controller 20 monitors an operating state of the injection molding machine 10, monitors molding conditions, or outputs an output signal of a mold open / close detection switch 25 for detecting an open / close state of the mold 17,
The output signal of the injection device retreat limit detection switch 26 indicating that the injection device 11 has retreated with respect to the mold 17 is monitored. In addition, main controller 20 monitors, for example, an answer back signal of cooling fan 13A of heating cylinder 13, an answer back signal of opening / closing valve 16V of hopper 16, and the like in order to monitor the operation state of the auxiliary equipment.

Further, when an abnormality occurs in the injection molding machine 10, the main controller 20 immediately stops the molding machine 10 in accordance with the type of abnormality classified in advance, and (b) injects only the material being measured to form the molding machine 10.
(C) Inject all the materials in the heating cylinder 13 and stop the molding machine 10. Further, main controller 20 also stops the auxiliary equipment of molding machine 10 when performing each automatic stop operation.

The automatic stop operation by the main controller 20 is specifically performed as follows.

(A) Immediately stop when a highly urgent abnormality occurs.

The hydraulic pump unit 19 of the injection molding machine 10 is turned off, and the control circuit is turned off.

Cooling fan 13A until heating cylinder 13 reaches specified temperature
Turn on.

The incidental equipment of the injection molding machine 10 is stopped or closed.

In addition, abnormalities with high urgency include breakage of screw 14,
The product cannot be discharged from the mold 17.

(B) Due to the occurrence of an abnormality that is highly likely to have caused a mechanical trouble, the molding machine 10 is stopped by injecting only the material being measured.

The open / close valve 16V of the hopper 16 is closed.

The molding operation by the injection molding machine 10 is stopped, the injection device 11 is retracted to the retreat limit, only the material being measured in the heating cylinder 13 is injected, the hydraulic pump unit 19 is turned off, and the control circuit is turned off.

 Thereafter, the above (a) is performed.

In addition, abnormalities that are likely to have caused a mechanical trouble include a loss of raw materials, an increase in oil temperature, and the like. Injection machine for all materials
Stop ten.

The open / close valve 16V of the hopper 16 is closed.

The injection device 11 is retracted to the retreat limit, and the measurement / injection of the material in the heating cylinder 13 is repeated, and all the material in the heating cylinder 13 is ejected.

 Thereafter, steps (a) to (a) are performed.

Note that an abnormality that is likely to cause many defects in the molded product is that the temperature of the heating cylinder 13 is overheated or overcooled.

 Next, the operation of the above embodiment will be described.

When the content of the abnormality is very urgent or moderate, the molding machine 10 is immediately stopped or the molding machine 10 is stopped by injecting only the material being measured. If it is low, all the materials in the heating cylinder 13 are injected and the molding machine 10 is stopped. Therefore, when an abnormality with low urgency occurs, the molding machine 10 is kept in a state where the material does not remain in the heating cylinder 13 and is easily restarted.
Can be stopped automatically.

When an abnormality occurs, instead of automatically stopping only the molding machine 10,
Because it automatically stops including incidental equipment, the molding machine
Re-operation of 10 and incidental facilities becomes easy.

[Effects of the Invention] As described above, according to the present invention, when an abnormality occurs in a molding machine, the molding machine can be automatically stopped in a state where restarting is possible as much as possible.

[Brief description of the drawings]

FIG. 1 is a control system diagram showing an injection molding machine to which the present invention is applied. 10 ... injection molding machine, 13 ... heating cylinder, 14 ... screw, 20 ... main controller.

Claims (2)

(57) [Claims] In a method for automatically stopping an injection molding machine, the operation of which is controlled by a control device, the control device monitors an operation state of the molding machine, and when an abnormality occurs, according to a previously classified abnormality content, (a) molding is performed. Three types of automatic stop operations: immediately stop the machine, (b) stop the molding machine by injecting only the material being measured, and (c) stop the molding machine by injecting all the materials in the heating cylinder Automatically stopping the injection molding machine. 2. The automatic stopping method for an injection molding machine according to claim 1, wherein the control device also stops ancillary equipment of the molding machine when performing each automatic stopping operation.