JPH0423612B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an operation termination control device for an injection molding machine.

Conventional technology When a set number of products have been produced and the operation of the injection molding machine is finished or the day's operation is finished, the injection unit is moved back to remove the nozzle from the mold and the material is supplied from the hopper. Stop the screw, move the screw forward to discharge the molding material from the heating cylinder, then move the screw back, rotate the screw for a certain period of time, and move the screw forward again.
It is necessary to complete the operation by repeating the reversing and rotating operations several times, which is called purging. In conventional injection molding machines, such operations were performed manually by an operator.

Problems to be Solved by the Invention The present invention solves the following problems when terminating the operation of an injection molding machine:
The injection molding machine is configured to automatically perform the work associated with the end and stop the injection molding machine.

Means for Solving the Problems FIG. 1 is a diagram showing the configuration of the present invention.
In an injection molding machine having a screw rotation driving means B for rotating the screw, an injection driving means C for moving the screw in the axial direction to perform injection, and an injection unit moving means A for moving the injection unit in the screw axial direction, An injection unit retraction control means E that drives the injection unit moving means A by a termination command to move the injection unit backward by a certain amount to remove the nozzle from the mold, and a material supply stop that closes the hopper opening and stops the supply of molding material according to an operation termination command. Means D and the retraction of the injection unit drive the injection driving means C to retract the screw after injection, and then drive the screw rotation driving means B to rotate the screw for a certain period of time. Injection and screw rotation are alternately repeated. Purging control means F
and a purging number control means G that counts the number of injections by the purging control means F and stops the operation of the purging control means when a set number of injections is reached.
The injection molding machine is configured to automatically perform operation termination processing.

Operation When the operation end command is input, the injection unit retraction control means E drives the injection unit moving means to retreat by a certain amount, and also operates the material supply stop means D to stop the material supply from the hopper to the heating cylinder. The material supply is stopped, and then the purging control means F drives the injection drive means C to perform injection and discharge the molten material in the heating cylinder, and then the screw is retracted, and the screw rotation drive manual means B The purging process in which the screw is rotated for a certain period of time is repeatedly performed, and when purging has been performed a set number of times, the purging number control means G stops the operation of the purging control means F to complete the operation termination process.

Embodiment FIG. 2 is a block diagram of an embodiment of the present invention.
1 is an injection unit, 2 is a heating cylinder, 3 is a screw, 4 is a nozzle, 5 is a hopper for supplying molding material, SOL is a solenoid for opening and closing the material supply port of the hopper 5, 6 is a screw shaft,
Reference numeral 7 denotes a screw rotation mechanism in the screw rotation drive means for rotating the screw 3, which includes a gear having a spline groove that engages with a spline shaft provided on the screw shaft 6, and a screw rotation motor that drives the gear. It consists of gears etc. connected to M1. Reference numeral 8 denotes an injection mechanism in an injection drive means for advancing the screw 3 in the axial direction to perform injection, and the injection mechanism 8 is driven by an injection servo motor M2. In this embodiment, the injection mechanism 8 includes a pressure plate 9 that presses the screw shaft 6, and a ball nut fixed to the pressure plate 9, which screws together to push the pressure plate 9 onto the screw 3. Ball screws 10a and 10b are moved in the axial direction, and a timing pulley 11 is rotated via a timing belt 12 by a timing pulley 12a fixed to the ball screws 10a and 10b and rotated by the drive of an injection servo motor M2.
It consists of a and 11b. PC is a pulse coder provided on a servo motor M2, and 13 is a slide base on which the injection unit 1 is slidably mounted. M3 is a motor in the injection unit moving means that slides the injection unit 1, LS is a limit switch that detects when the injection unit is moved backward by the motor M3 and has retreated by a certain amount, and 14 is a control device. , a central processing unit (hereinafter referred to as CPU) 15 that controls the entire injection molding machine, and stores a control program for controlling the injection molding machine;
It also includes a memory 16 for arithmetic processing, an output circuit 17, an input circuit 18, and a manual input device 19 provided on an operation panel or the like for manually issuing various commands to the injection molding machine. 20 is a reversible counter that counts forward and reverse pulses from the pulse coder, and 21, 22, and 23 are motor drive control devices for driving and controlling the motor M1, servo motor M2, and motor M3, respectively.

Next, the operation of this embodiment will be explained along with the operation processing flow shown in FIG.

When the set planned quantity of products has been manufactured or when the operator inputs an operation end command from the manual input device 19, the CPU 15 first controls the motor M.
3 to move the injection unit 1 to the slide base 1.
3 to remove the nozzle 4 from the mold (right side in Figure 2) (step S1). and,
It is determined whether the limit switch LS is turned on (step S2), and if it is turned on, the motor M3
Stop driving the solenoid (step S3) and
Turn SOL OFF, close the material supply port of the hopper 5, stop the supply of molding material from the hopper 5 into the heating cylinder 2 (step S4), and register R
Clear (step S5). Next, the injection servo motor M2 is driven to advance the screw 3 to discharge the molding material remaining in the heating cylinder 2, and the value of the reversible counter 20 that counts the pulses from the pulse coder PC indicates the advance of the screw 3. Servo motor M for injection until the value L1 reaches the limit position.
2, and when that value is reached, the driving of the injection servo motor M2 is stopped and "1" is added to the register R (steps S6, S7, S8). Next, it is determined whether the value of the register R has reached the purging circuit value RO set from the manual input device 19 (step S9), and if it has not reached it, the injection servo motor M2 is reversed to keep it constant. The screw is retracted (step S10), and it is determined whether the value on the counter 20 has reached the value L2 when the screw 3 is retracted by a certain amount (step S11). The motor M2 is stopped (step S12), the timer T is reset and started (step 13), and the motor M1 is driven to rotate the screw 3 (step S14).
Then, when the timer T reaches a certain value T0, that is, when the screw 3 is rotated for a certain period of time, the motor M1 is stopped (steps S15 and S16), and the process from step S6 onwards is repeated again, so that the value of the register R becomes the set value. When R0 is reached, that is, after purging has been performed a set number of times (step S9), the mold is closed and the injection molding machine is turned off (step S9).
S20), the operation of the injection molding machine ends.

In this embodiment, the solenoid SOL was driven after the injection unit retreated, but at the same time as the operation end command is input, step S1 in FIG.
You can go there. Further, if the motor M3 of the injection unit moving means is a servo motor, the limit switch LS is not necessary.

Effects of the Invention As described above, when an operation termination command is input, the injection molding machine automatically turns off the power and stops after performing termination processing such as purging, so there is no need to terminate operation. There is no need for the operator to perform the work associated with this process, and since parsing is performed the number of times set according to the molding material, it is safe and prevents erroneous operations.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of the present invention, and FIG. 2 is a diagram showing the configuration of the present invention.
FIG. 3, a block diagram of an embodiment of the present invention, is an operational processing flow of the embodiment. 1... Injection unit, 2... Heating cylinder, 3
... Screw, 4 ... Nozzle, 5 ... Hopper, 7 ... Screw rotation mechanism, 8 ... Injection mechanism, 14 ... Control device, LS ... Limit switch, SOL ... Solenoid, M1, M3 ... Motor, M2...Servo motor.

Claims (1)

[Claims] 1. In an injection molding machine having a screw rotation drive means for rotating the screw, an injection drive means for moving the screw in the axial direction to perform injection, and an injection unit moving means for moving the injection unit in the screw axial direction, an operation end command is issued. an injection unit retraction control means for driving the injection unit moving means by a certain amount to cause the nozzle to separate from the mold; and a material supply stop means for closing the hopper port and stopping the supply of molding material in response to an operation end command.
a purging control means that alternately repeats injection and screw rotation in which the injection drive means is driven by the retraction of the injection unit, and after the screw is retracted after injection, the screw rotation drive means is driven to rotate the screw for a certain period of time; An automatic operation termination control device for an injection molding machine, comprising a purging number control means that counts the number of injections performed by the purging control means and stops the operation of the purging control means when a set number of injections is reached.