JP2006116755A - Screw rotation controlling method for extruder in on-line blend-injection-molding machine, and on-line blend-injection-molding machine having extruder using this method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw rotation number controlling method which does not require hands of a worker, and can change to an arbitrary rotation number in steps, or gradually linearly or in curves, automatically and at an arbitrary time when the screw rotation number of an extruder on an on-line blend-injection-molding machine is started, or is changed during the operation, and to provide the on-line blend-injection-molding machine having the extruder using this method. <P>SOLUTION: In this screw rotation controlling method for the extruder in the on-line blend-injection-molding machine, at the time of starting, the screw rotation number is raised from 0 to a predetermined rotation number in steps within a specified period of time. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an extruder screw control method for an on-line blend injection molding machine and an on-line blend injection molding machine having an extruder using this method.

The online blend injection molding machine has recently been used because it is not necessary to use pelletized resin for the material resin to be supplied, it can be supplied directly from the material resin manufacturing process, and the pellet manufacturing process can be omitted. It is supposed to be. In many cases, the plasticizer used in this online blend injection molding machine is an extruder that has a proven record in producing pellets. The screw rotation speed of this extruder, that is, the extrusion amount Q, and the feeder The amount Ns of resin material supplied from is related by Q / Ns (extrusion amount / screw rotation speed) and is an important item. The reason is that it is necessary to smoothly increase the screw rotation to a predetermined rotational speed when the extruder is started or during operation. The extruder in such an on-line blend injection molding machine can be found in the following patent documents.
JP-A-5-131509 Japanese Patent Laid-Open No. 7-112467

  The screw speed of the extruder in this on-line blend injection molding machine is suddenly increased from 0 to a predetermined speed at start-up, which places a heavy burden on the screw and the gear box that transmits the motor power to the screw. Therefore, normally, the screw rotation speed was gradually increased while reducing the burden safely and manually. The same applies to a case where the number of rotations during operation is increased to a predetermined number of rotations. In addition, since the feeder was also manually operated to gradually increase in accordance with the screw rotation speed, the operator has to perform the troublesome work of gradually changing the amount of resin material supplied to the feeder according to the screw rotation speed. It was forced to.

  The object of the present invention is to change the screw rotation speed of the extruder at the time of start-up or during operation, without having to bother the operator, and at any time automatically. To provide an on-line blend injection molding machine screw control method and an on-line blend injection molding machine having an extruder using the screw control method, which can be changed stepwise or gradually to the rotational speed of the on-line blend injection molding machine. Yes.

  In order to achieve the above object, the present invention firstly plasticizes a resin material supplied from a feeder by heating and melting with an extruder, and supplies the plasticized resin to an injection device via an accumulator. In the screw rotation control method of the extruder of the on-line blend injection molding machine to be performed, when starting up the screw rotation speed of the extruder, it is increased stepwise from 0 to a predetermined rotation speed within a predetermined time. The screw rotation control method of the extruder of the featured online blend injection molding machine was used.

  As a second aspect of the invention, a screw rotation control method for an on-line blend injection molding machine extruder is characterized in that the speed is gradually increased to a predetermined number of revolutions at the time of startup.

  According to a third aspect of the present invention, there is provided an on-line blend injection characterized in that the speed is increased stepwise from a rotation speed during operation of an extruder screw of an on-line blend injection molding machine to a predetermined rotation speed within a predetermined time. An on-line blend injection molding machine characterized in that, in a screw rotation control method of an extruder of a molding machine, the speed is increased stepwise from a certain rotation speed during operation to a predetermined rotation speed within a predetermined time. The screw rotation control method of the extruder was used.

  Further, as a fourth invention, instead of increasing the rotational speed during the screw operation of the extruder of the online blend injection molding machine from the rotational speed to a predetermined rotational speed within a predetermined time, it is determined in advance. The screw rotation control method of the extruder of the on-line blend injection molding machine is characterized by gradually increasing the number of rotations to a higher value.

  Further, as a fifth invention, in the screw rotation control method of the extruder of the online blend injection molding machine, the resin material supply amount from the feeder is set in accordance with a preset value of Q / Ns (extrusion amount / screw rotation number). The screw rotation control method of the extruder of the on-line blend injection molding machine is characterized by being changed.

Furthermore, as a sixth invention, in an on-line blend injection molding machine in which a resin material supplied from a feeder is heated and melted by an extruder to be plasticized, and this plasticized resin is supplied to an injection device via an accumulator to perform injection molding. The on-line blend injection molding machine is characterized by having an extruder that performs the screw rotation control method described above.

  According to the present invention, when the screw rotational speed of the extruder is started or when the screw rotational speed is changed during operation, it is not necessary to bother the operator's hand. It is possible to provide an on-line blend injection molding machine having a screw control method for an extruder of an on-line blend injection molding machine that can be changed stepwise or gradually in number, and an extruder using this method.

  An embodiment of the present invention will be described with reference to FIG. 1 to FIG. 4. 1 is an extruder 4 that is a plasticizing device including a feeder 3 driven by a motor 2 in an on-line blend injection molding machine, and the extruder 4. The accumulator 5 that passes through or temporarily stores the plasticized resin material, and an injection molding machine that injection-molds the plasticized resin sent from the accumulator 5 (only the injection device 6 is shown, and the mold clamping part is not shown) ).

  The rotation of the screw 7 of the extruder 4 is driven by a motor 8 via a gear box 9, and the resin material supplied from the feeder 3 is shearing heat due to the rotation of the screw 7 and a heating device such as a heater (not shown). Is heated and melted to be plasticized to become a plasticized resin, which is stored in the accumulator 5. This plasticized resin is supplied to the injection device 6 during the injection process of the injection molding machine, supplied to the injection device 6, and injected by the plunger 11 by hydraulic pressure.

  The online blend injection molding machine 1 is controlled by a molding machine controller 12 as shown in FIGS. More specifically, the molding machine control device 12 includes a servo CPU 13 that controls the drive motor, a sequence controller CPU 14 that controls the sequence relationship of the entire molding machine, and a main control CPU 15 that controls the process of the entire molding machine. , And external communication, for example, an external communication CPU 16 for an Internet line using an intranet, a telephone or the like, and a common memory 17, a common machine interface 19, a display / An operation panel 20 is provided. These CPUs share common RAM information via the bus 18.

  The relationship between the servo rotation speed of the extruder 4 and the servo CPU 13 for controlling the driving motor related to the feeder 3 will be described. The motor 2 of the feeder 3 and the motor 8 of the extruder 4 are connected to the motor driver 19 and the servo CPU 13 is connected. Is controlled by the control program. Detection data such as the number of revolutions from the motors 2 and 8 is subjected to pulse detection or A / D conversion detection and conversion as necessary, and is guided to the servo CPU 13 via the motor driver 19. As shown in FIG. 4, the data is taken in by the data conversion means 23 in the servo CPU 13 and sequentially stored in the storage unit 24.

The storage unit 24 includes a data setting unit using a keyboard (not shown). For example, a reference for producing a pattern as shown in FIG. Arbitrary time tn, screw Nn, and the like are set.
Accordingly, the operator displays t1, t2, t3... Tn at an arbitrary time tn, and N1, N2, N3... Nn at the corresponding screw rotation speed Nn from the keyboard on the display / operation panel 20. By driving, the comparison calculation means 25 calculates a pattern indicating the relationship between the time and the screw rotation speed as shown in FIG. 4, and the result is stored in the common memory 17 via the bus 18 by the display means 26. Is called from the common memory as necessary by screen selection, etc., and is displayed as a display image on the display / operation panel 20, and a rotation command is sent to the motor 2 and the motor 8. Supply resin material to fit.

  In order to prevent danger, the above-described stepwise increase in the screw rotation speed is performed by pressing both the buttons 28 and 29 by checking the safety after pressing the start button 28 in the molding machine control device 12 and pressing the change button 29. The signal is introduced from the input / output module 30 to the servo CPU 13 so that the motor driver 19 controls the rotation of the motor 2 and the motor 8.

  Further, the increase in the number of screw rotations is not limited to a stepwise pattern, and there is no problem even if the screw rotation speed is gradually increased linearly or curvedly as in the graph A indicated by a dotted line in FIG. Furthermore, you may carry out not only at the time of starting but in driving | operation.

  According to the present invention, the screw rotation speed is gradually increased stepwise, linearly or in a curve. Accordingly, the feeder 3 also supplies the material resin supplied to the extruder at a preset Q / Ns (extrusion amount). / Screw rotation number).

  According to the present invention, when the screw rotation speed of the extruder of the on-line blend injection molding machine is started or during operation, it is not necessary to bother the operator and automatically and arbitrarily. In this time, it can be changed stepwise or gradually to an arbitrary number of revolutions. Therefore, if this invention is used, in an on-line blend injection molding machine, supply of the molten resin to the injection device is suitable, and an on-line blend injection molding machine that is more functionally advanced.

  Although the above explanation has been given for a hydraulic on-line blend injection molding machine, of course, the present invention is not limited to this. It is obvious that there may be.

It is explanatory drawing which shows the outline | summary to which the screw rotation control method of the extruder of the online blend injection molding machine by this invention is applied. It is explanatory drawing which shows the outline | summary of the control apparatus with which the screw rotation control method of the extruder of the online blend injection molding machine by this invention is applied. It is a detailed explanatory view of the servo CPU of the control device to which the screw rotation control method of the extruder of the online blend injection molding machine according to the present invention is applied. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the outline | summary to which the screw rotation control method of the extruder of the online blend injection molding machine by this invention is applied, The rotation speed of a motor is raised to predetermined value stepwise or gradually in arbitrary time It is explanatory drawing which showed the case.

Explanation of symbols

1 Online blend injection molding machine 2 Motor (for feeder)
3 Feeder 4 Extruder 5 Accumulator 6 Injection molding machine (injection device)
7 screw 8 motor (for extruder)
9 Gear box 10 Valve 11 Plunger 12 Molding machine controller 13 Servo CPU
14 CPU for sequence controller
15 CPU for process controller
16 CPU for external communication
17 common memory 18 bus 19 motor driver 20 display / operation panel 24 storage unit 25 comparison calculation means 26 display means 27 output means 28 start button 29 change button 30 input / output module

Claims (6)

  The resin material supplied from the feeder is heated and melted by an extruder to be plasticized, the plasticized resin is supplied to an injection device via an accumulator, and the injection device is used to inject the resin into a mold to form a molded product. In the screw rotation control method of the extruder in the online blend injection molding machine, the screw rotation speed of the extruder is increased stepwise from 0 to a predetermined rotation speed within a predetermined time when starting up. A screw rotation control method for an extruder in an on-line blend injection molding machine.   2. The method according to claim 1, wherein instead of gradually increasing from 0 to a predetermined number of rotations within a predetermined time when starting, the number is gradually increased to a predetermined number of rotations. Screw rotation control method for an extruder in an online blend injection molding machine.   An extruder in an on-line blend injection molding machine characterized in that during a screw operation of an extruder of an on-line blend injection molding machine, the speed is increased stepwise from a certain number of revolutions to a predetermined number of revolutions within a predetermined time. Screw rotation control method.   During the screw operation of the extruder of the online blend injection molding machine, instead of gradually increasing from a certain number of rotations to a predetermined number of rotations within a predetermined time, gradually increase to a predetermined number of rotations. 4. The screw rotation control method for an extruder in an online blend injection molding machine according to claim 3, wherein the screw rotation is increased.   The screw rotation control method of the extruder of the online blend injection molding machine is characterized in that the resin material supply amount from the feeder is changed in accordance with a preset Q / Ns (extrusion amount / screw rotation number) value. The screw rotation control method of the extruder in the on-line blend injection molding machine according to any one of claims 1 to 4. In an on-line blend injection molding machine in which a resin material supplied from a feeder is heated and melted by an extruder to be plasticized, this plasticized resin is supplied to an injection device via an accumulator, and injection molding is performed. An on-line blend injection molding machine comprising an extruder for performing the screw rotation control method according to any one of claims 1 to 5.

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