JP2941043B2 - Injection molding machine type change purge method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for purging a mold of an injection molding machine.

[Prior Art] Conventionally, when the injection molding machine is changed, in order to purge the material in the injection device, the metering operation and the injection operation of the injection device are repeated by manual operation.

[Problems to be Solved by the Invention] However, in the related art, the operation of purging the material in the injection device at the time of changing the mold cannot be mechanized, and thus there is a problem that workability at the time of changing the mold is poor.

SUMMARY OF THE INVENTION It is an object of the present invention to mechanize the operation of purging a material in an injection device at the time of a mold change, and to improve workability at the time of a mold change.

Means for Solving the Problems The present invention provides a method for purging a mold of an injection molding machine, which purges a material between injection devices when the molding of the injection molding machine is changed.
The weighing operation and the injection operation of the injection device are performed on condition that the operation mode of the injection molding machine is the remodeling mode, the remodeling purge switch is turned on, and the injection device is at the retreat limit position with respect to the mold. Is repeated with a certain interval.

According to the present invention, when the injection molding machine is in the mold change mode, the mold change purge switch is turned on, and the injection device is at the retreat limit position with respect to the mold, the measuring operation of the injection device and the injection are performed. The operation is repeated, and the material in the injection device is purged. Therefore, the operation of purging the material in the injection device at the time of the mold change can be mechanized, and the workability at the time of the mold change can be improved.

FIG. 1 is a control system diagram showing an injection molding machine to which the present invention is applied, and FIG. 2 is a time diagram showing a measuring operation and an injection operation.

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
Is a supplementary facility of the injection molding machine 10 via the supplementary facility controller 22, a cooling water valve 13V of the heating cylinder 13,
Opening / closing valve 16V for hopper 16, temperature control valve 17V for mold 17,
The operation control of the automatic color changer 23, the molded product unloader 24, and the like is performed.

Further, the main controller 20 determines that the operation mode of the injection molding machine 10 by the molding machine controller 21 is the mold change mode, that the mold change purge switch 25 is on, and that the injection device 11 is retracted with respect to the mold 17. On the condition that the injection device retreat limit detection switch 26 for detecting that the injection device is at the limit position is on, the injection device 11 controls the injection cylinder drive unit 12A and the screw drive unit 14A to perform the type change purge operation. The metering operation and the injection operation are repeated at a certain interval.

In performing the above-described type change purging operation by the main controller 20, the measuring stroke can be a measuring stroke of the product molded immediately before the type change or a measuring stroke for purge different from the immediately preceding measuring stroke. Further, as the injection time, the injection time of the product molded immediately before the mold change or the purge injection time different from the immediately preceding injection time can be adopted.

In the example of the PVC resin, the interval from the measuring operation to the injection operation was 30 seconds, and the interval from the injection operation to the measuring operation was 50 seconds (see FIG. 2). This interval needs to be changed depending on the resin, but is generally 10 to 300 seconds, and the interval from the injection operation to the weighing operation can be set longer than the interval from the weighing operation to the injection operation.

Further, the material purged by the above-described type change purging operation by the main controller 20 is performed during the measuring operation or after the end of the injection,
It is put into a cooling water tank via an unloading conveyor and processed.

In the injection molding machine 10, the hydraulic pump unit 19 includes a hydraulic circuit for the injection cylinder driving section 12A and the mold clamping driving section 1A.
Hydraulic circuits for 7A are made independent from each other, so that the injection device 11 can perform a metering / injection type change purge operation even during the type change operation.

In addition, in the injection molding machine 10, the main controller 20 is capable of automatically opening and closing the cooling water valve 13V of the heating cylinder 13 and the temperature adjusting valve 17V of the mold 17 in conjunction with the turning on of the mold change purge switch 25. .

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

According to the above embodiment, when the injection molding machine 10 is in the mold change mode, the mold change purge switch 25 is turned on, and the injection device 11 is at the retreat limit position with respect to the mold 17, the measurement of the injection device 11 is performed. The operation and the injection operation are repeated, and the material in the injection device 11 is purged. Therefore, the operation of purging the material in the injection device 11 at the time of the mold change can be mechanized, and the workability at the time of the mold change can be improved.

[Effects of the Invention] As described above, according to the present invention, the operation of purging the material in the injection device at the time of model change can be mechanized, and the workability at the time of model change can be improved.

[Brief description of the drawings]

FIG. 1 is a control system diagram showing an injection molding machine to which the present invention is applied, and FIG. 2 is a time diagram showing a measuring operation and an injection operation. 10… Injection molding machine, 11… Injection device, 20… Main control device, 21…
Molding machine controller, 25 ... Model change purge switch, 26 ... Injection device backward limit detection switch.

Claims (1)

(57) [Claims] In a method of purging a mold of an injection molding machine, the material between the injection devices is purged when the molding of the injection molding machine is changed.
The weighing operation and the injection operation of the injection device are performed on condition that the operation mode of the injection molding machine is the change mode, the change purge switch is turned on, and the injection device is at the retreat limit position with respect to the mold. Wherein the method is repeated with a certain interval.