JP4763081B1 - Injection molding machine having weighing back pressure setting means - Google Patents

Injection molding machine having weighing back pressure setting means Download PDF

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JP4763081B1
JP4763081B1 JP2010042040A JP2010042040A JP4763081B1 JP 4763081 B1 JP4763081 B1 JP 4763081B1 JP 2010042040 A JP2010042040 A JP 2010042040A JP 2010042040 A JP2010042040 A JP 2010042040A JP 4763081 B1 JP4763081 B1 JP 4763081B1
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back pressure
weighing
injection molding
molding machine
resin
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JP2011177928A (en
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修一 分部
晴彦 中尾
彰 品川
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Fanuc Corp
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Fanuc Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76066—Time
    • B29C2945/76076—Time duration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76083—Position
    • B29C2945/7609—End position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/7618—Injection unit
    • B29C2945/76187—Injection unit screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76344—Phase or stage of measurement
    • B29C2945/76367—Metering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76498—Pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76822—Phase or stage of control
    • B29C2945/76846—Metering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76929—Controlling method
    • B29C2945/76936—The operating conditions are corrected in the next phase or cycle

Abstract

【課題】データベースに背圧データが無い場合、樹脂メーカの推奨値が分からない場合などでも、適切な背圧を設定できる計量背圧設定手段を有する射出成形機を提供すること。
【解決手段】背圧の初期値として背圧Ｂｐを設定し（ＳＡ１００）、ノズルが金型から離れた状態で手動計量を開始し、所定時間が経過したか否かを判断し、所定時間が経過すると、スクリュが計量位置まで下がるか否かを判断し（ＳＡ１０１〜ＳＡ１０３）、計量位置まで下がる場合には、背圧Ｂｐにαを加算した値を、新たな背圧Ｂｐとし、シリンダ内の溶融樹脂を排出し、計量位置まで下がらない場合には、成形条件の背圧Ｂｐを設定する（ＳＡ１０４〜ＳＡ１０６）、計量背圧設定手段を備えた射出成形機。
【選択図】図２To provide an injection molding machine having a measuring back pressure setting means capable of setting an appropriate back pressure even when there is no back pressure data in a database or when a recommended value of a resin manufacturer is not known.
SOLUTION: Back pressure Bp is set as an initial value of back pressure (SA100), manual weighing is started in a state where the nozzle is separated from the mold, it is determined whether or not a predetermined time has elapsed, and the predetermined time After the elapse of time, it is determined whether or not the screw is lowered to the measuring position (SA101 to SA103). An injection molding machine provided with a metering back pressure setting means for setting the back pressure Bp of molding conditions when the molten resin is discharged and does not fall to the metering position (SA104 to SA106).
[Selection] Figure 2

Description

本発明は射出成形機に関し、特に、計量背圧設定手段を有する射出成形機に関する。   The present invention relates to an injection molding machine, and more particularly to an injection molding machine having a metering back pressure setting means.

射出成形機は、加熱シリンダ内で加熱され溶融した樹脂を、高い圧力で射出して金型装置内のキャビティ空間に充填し、該キャビティ空間内において冷却して固化させた後、成形品を金型内から取り出すようになっている。   The injection molding machine injects resin melted by heating in a heating cylinder at a high pressure, fills the cavity space in the mold apparatus, and cools and solidifies in the cavity space. Take out from inside the mold.

前記射出成形機は、金型装置、型締装置、および射出装置を備える。前記金型装置は、固定金型及び可動金型を備え、前記型締装置は、固定プラテン及び可動プラテンを備え、型締用モータを駆動することによって可動プラテンを進退させることによって、型閉じ、型締め及び型開きを行う。   The injection molding machine includes a mold device, a mold clamping device, and an injection device. The mold apparatus includes a fixed mold and a movable mold, and the mold clamping apparatus includes a fixed platen and a movable platen, and the mold is closed by advancing and retracting the movable platen by driving a mold clamping motor. Perform mold clamping and mold opening.

前記射出装置は、ホッパから供給された樹脂を加熱して溶融させる前記加熱シリンダ、及び溶融した樹脂を射出する射出ノズルを備え、前記加熱シリンダ内にスクリュが進退自在に、かつ、回転自在に配設される。   The injection device includes the heating cylinder that heats and melts the resin supplied from the hopper, and the injection nozzle that injects the molten resin, and the screw is disposed in the heating cylinder so that the screw can advance and retreat. Established.

計量工程時に、計量用モータを駆動することによってスクリュを回転させると、樹脂が計量され、加熱シリンダ内におけるスクリュによりシリンダの前方に樹脂が溜められ、射出工程時に、射出用モータを駆動することによってスクリュを前進させると、前方に溜められた溶融樹脂が射出ノズルから、型締めが行われた状態の金型装置のキャビティ空間に充填される。   When the screw is rotated by driving the metering motor during the weighing process, the resin is weighed, and the resin is collected in front of the cylinder by the screw in the heating cylinder, and by driving the injection motor during the injection process. When the screw is advanced, the molten resin collected in the front is filled from the injection nozzle into the cavity space of the mold apparatus in a state where the mold clamping is performed.

そして、前記キャビティ空間内の溶融樹脂が冷却された成形品になり、型開きが行われると、エジェクタ装置の突き出し用モータが駆動され、エジェクタピンが前進させられ、前記成形品が突き出され、離型される。   Then, when the molten resin in the cavity space is cooled and the mold is opened, the ejector motor of the ejector device is driven, the ejector pin is advanced, and the molded article is ejected and separated. Typed.

射出成形機を自動運転することによって、連続的に成形品を成形するにあたり、計量工程において樹脂を計量するための背圧などの成形条件の設定、換言すれば、計量設定が行われる。スクリュを回転させると樹脂がシリンダの前方に運ばれる。その結果、スクリュが後方に押され、後ろに下がる。この時、スクリュが後ろに下がらないようにスクリュを前方に押す。この力を背圧という。この背圧が無ければ、シリンダ内の樹脂に空気が混入してしまう。   By automatically operating the injection molding machine, setting of molding conditions such as back pressure for measuring the resin in the measuring step, in other words, setting of the measurement, is performed when continuously molding the molded product. When the screw is rotated, the resin is carried forward of the cylinder. As a result, the screw is pushed backward and lowered backward. At this time, push the screw forward so that the screw does not fall back. This force is called back pressure. Without this back pressure, air would be mixed into the resin in the cylinder.

従来の背圧の設定方法においては、樹脂の種類、樹脂の噛み込み状態に関係なく、作業者の経験、樹脂メーカの推奨値などを元に一律に３Ｍｐａ、５Ｍｐａなどと設定されることが多い。しかし、樹脂の種類や樹脂の噛み込み状態などによって背圧設定の適正値が異なることから、このようにして一律に設定された背圧設定が適切でない場合もある。   In the conventional back pressure setting method, it is often set to 3 Mpa, 5 Mpa, etc. uniformly based on the experience of the operator, the recommended value of the resin manufacturer, etc., regardless of the type of resin and the resin biting state. . However, since the appropriate value of the back pressure setting varies depending on the type of resin, the resin biting state, etc., the back pressure setting uniformly set in this way may not be appropriate.

例えば、背圧設定が低い場合には、シリンダ内の樹脂密度が低くなり、気泡やシルバーの発生を招き、逆に、背圧設定が高い場合にはシリンダ内の樹脂密度が高くなり、せん断発熱による焼けの発生を招くこともあり、適切な背圧設定でないために成形不良を発生することも多い。   For example, if the back pressure setting is low, the resin density in the cylinder will be low, causing bubbles and silver. Conversely, if the back pressure setting is high, the resin density in the cylinder will be high and shear heat will be generated. In some cases, burns due to the occurrence of burns are caused, and molding defects are often caused because the back pressure is not set appropriately.

そして、このような成形不良が発生すると背圧設定を調整して対応していた。このようなことから、適切な背圧設定方法を見出すことが望まれていた。   When such a molding defect occurs, the back pressure setting is adjusted. Therefore, it has been desired to find an appropriate back pressure setting method.

特許文献１には、樹脂の種類に対応した成形条件（背圧、スクリュ回転速度、シリンダ温度など）をデータベースとして記憶しておき、樹脂の種類が指定されたら成形条件を読み出して背圧等を自動設定する技術が開示されている。   In Patent Document 1, molding conditions (back pressure, screw rotation speed, cylinder temperature, etc.) corresponding to the type of resin are stored as a database, and when the type of resin is specified, the molding conditions are read and the back pressure and the like are stored. A technique for automatic setting is disclosed.

特開平２−１４７２２６号公報Japanese Patent Laid-Open No. 2-147226

しかし、特許文献１に開示された技術では、データベースに記憶されていない樹脂の種類には対応できない問題がある。
そこで本発明の目的は、上記従来技術の問題点に鑑み、データベースに背圧データが無い場合、樹脂メーカの推奨値が分からない場合などでも、適切な背圧を設定できる計量背圧設定手段を有する射出成形機を提供することである。 However, the technique disclosed in Patent Document 1 has a problem that it cannot cope with the type of resin not stored in the database.
Therefore, in view of the above-mentioned problems of the prior art, the object of the present invention is to provide a measurement back pressure setting means capable of setting an appropriate back pressure even when there is no back pressure data in the database or when the recommended value of the resin manufacturer is not known. An injection molding machine is provided.

本願の請求項１に係る発明は、射出成形機において、ノズルを開放した状態で設定背圧により計量を行う計量制御手段と、計量を行った際に所定時間内に計量位置まで計量動作が完了するか否かを判別する計量動作完了判別手段と、を備え、設定背圧を第一所定圧として計量を行い、所定時間内に計量位置まで計量動作が完了するか否かを判別し、スクリュが所定時間内に計量位置まで計量動作を完了する場合は設定背圧に第二所定圧を加算して新たな設定背圧として計量を行い、所定時間内に計量位置まで計量動作が完了するか否かを判別することを繰り返し、スクリュが所定時間内に計量位置まで後退しなかった時の設定背圧を計量時の背圧として設定することを特徴とする計量背圧設定手段を有する射出成形機である。   In the invention according to claim 1 of the present application, in the injection molding machine, the weighing control means for measuring by the set back pressure with the nozzle opened, and the measuring operation is completed to the measuring position within a predetermined time when the measurement is performed. Measuring operation completion determining means for determining whether or not to perform measurement, performs measurement with the set back pressure as the first predetermined pressure, determines whether or not the measuring operation is completed up to the measuring position within a predetermined time, and If the weighing operation is completed up to the measuring position within the predetermined time, the second predetermined pressure is added to the set back pressure to measure the new set back pressure, and the weighing operation is completed to the measuring position within the predetermined time. Injecting molding having a weighing back pressure setting means characterized in that the set back pressure when the screw does not move back to the weighing position within a predetermined time is set as the back pressure at the time of weighing. Machine.

本発明により、データベースに背圧データが無い場合、樹脂メーカの推奨値が分からない場合などでも、適切な背圧を設定できる計量背圧設定手段を有する射出成形機を提供できる。   According to the present invention, it is possible to provide an injection molding machine having a weighing back pressure setting means capable of setting an appropriate back pressure even when there is no back pressure data in the database or when a recommended value of a resin manufacturer is not known.

本発明の実施形態である射出成形機の概略図である。It is the schematic of the injection molding machine which is embodiment of this invention. 背圧を設定する本発明のアルゴリズムを示すフローチャートである。It is a flowchart which shows the algorithm of this invention which sets a back pressure.

図１は、本発明の実施形態である射出成形機の概略図である。符号Ｍは射出成形機である。符号Ｍｃは型締部、符号Ｍｉは射出部、符号Ｍｂは機台である。射出成形機Ｍは、機台Ｍｂ上に型締部Ｍｃ、および射出部Ｍｉを備える。 FIG. 1 is a schematic view of an injection molding machine according to an embodiment of the present invention. Reference numeral M denotes an injection molding machine. Reference numeral Mc denotes a mold clamping part, reference numeral Mi denotes an injection part, and reference numeral Mb denotes a machine base. Injection molding machine M is provided with a clamping portion Mc, and injection unit Mi on a machine base Mb.

型締部Ｍｃは、可動プラテン２３を前後進させる可動プラテン前後進モータ２０、リアプラテン２１、成形品を金型から押し出すエジェクタピンを突き出すためのエジェクタ前後進モータ２２、可動プラテン２３、タイバー２４、固定プラテン２５、トグル機構３３、エジェクタ機構３４を備える。リアプラテン２１と固定プラテン２５とは複数のタイバー２４で連結されており、可動プラテン２３はタイバー２４にガイドされるように配置されている。可動プラテン２３に可動側金型，固定プラテン２５に固定側金型の金型３２が取り付けられる。   The mold clamping portion Mc includes a movable platen forward / reverse motor 20 for moving the movable platen 23 back and forth, a rear platen 21, an ejector forward / backward motor 22 for ejecting an ejector pin for pushing a molded product out of the mold, a movable platen 23, a tie bar 24, and a fixed plate. A platen 25, a toggle mechanism 33, and an ejector mechanism 34 are provided. The rear platen 21 and the fixed platen 25 are connected by a plurality of tie bars 24, and the movable platen 23 is disposed so as to be guided by the tie bars 24. A movable mold is attached to the movable platen 23 and a fixed mold 32 is attached to the fixed platen 25.

射出部Ｍｉは、シリンダ２７、シリンダ２７内に樹脂のペレットを供給するホッパ２８、ホッパ２８からシリンダ２７内への樹脂の供給を遮断するホッパシャッタ２９、スクリュ回転モータ３０、スクリュ前後進モータ３１、スクリュ回転モータ３０から伝動機構を介して回転させられるスクリュ２６、を備える。これらの構成は従来からの射出成形機と相違するところはない。   The injection part Mi includes a cylinder 27, a hopper 28 for supplying resin pellets into the cylinder 27, a hopper shutter 29 for blocking the supply of resin from the hopper 28 into the cylinder 27, a screw rotation motor 30, a screw forward / reverse motor 31, A screw 26 that is rotated from the screw rotation motor 30 via a transmission mechanism is provided. These configurations are not different from conventional injection molding machines.

制御装置１は、射出成形機Ｍを制御し成形品の生産を制御する制御装置である。プロセッサ２は、バス３を介してサーボインタフェース４、システムプログラムを記憶するＲＯＭ６、データの一時記憶や各種制御プログラムを記憶するＲＡＭ７、表示装置付入力装置用インタフェース８、表示装置付入力装置９と接続されている。ＲＯＭ６は、本発明に係る計量背圧を設定するための処理プログラムを記憶している。   The control device 1 is a control device that controls the injection molding machine M to control the production of a molded product. The processor 2 is connected via a bus 3 to a servo interface 4, a ROM 6 for storing system programs, a RAM 7 for temporarily storing data and various control programs, an input device interface 8 with a display device, and an input device 9 with a display device. Has been. The ROM 6 stores a processing program for setting the measured back pressure according to the present invention.

サーボインタフェース４にはサーボアンプ５が接続されている。また、表示装置付入力装置用インタフェース８には表示装置付入力装置９が接続されている。表示装置付入力装置９は、タッチパネル式の液晶ディスプレイとキーボードなどで構成されている。表示装置付入力装置９によって各種指令、各種パラメータなどの設定などが可能である。表示装置付入力装置９のタッチパネル式の表示装置の表示画面に各種インタフェース画面を表示することで各種指令、各種パラメータの設定が可能である。   A servo amplifier 5 is connected to the servo interface 4. The input device 9 with a display device is connected to the input device interface 8 with a display device. The input device 9 with a display device includes a touch panel type liquid crystal display and a keyboard. Various commands and various parameters can be set by the input device 9 with a display device. Various commands and parameters can be set by displaying various interface screens on the display screen of the touch panel type display device of the input device 9 with a display device.

プロセッサ２は、射出成形機全体を制御するプロセッサである。サーボアンプ５には、可動プラテン前後進モータ２０、エジェクタ前後進モータ２２、スクリュ回転モータ３０、スクリュ前後進モータ３１が接続される。図ではサーボアンプ５は１つとして図示されているが、前記それぞれのモータに各々サーボアンプが接続されている。また、各サーボモータには図示省略した位置・速度検出器が内蔵され、位置・速度検出信号が制御装置１にフィードバックされる。   The processor 2 is a processor that controls the entire injection molding machine. Connected to the servo amplifier 5 are a movable platen forward / reverse motor 20, an ejector forward / reverse motor 22, a screw rotation motor 30, and a screw forward / backward motor 31. Although the servo amplifier 5 is shown as one in the figure, a servo amplifier is connected to each of the motors. Each servo motor includes a position / speed detector (not shown), and a position / speed detection signal is fed back to the control device 1.

自動運転を行うにあたり、射出成形機Ｍは型閉動作から開始するが、その際においては、手動による計量、すなわち、手動計量が行われる。該手動計量においては、キャビティ空間内に成形された成形品がない状態であり、かつ、加熱シリンダ内に背圧は加えられない。したがって、スクリュの前方に溜められた樹脂は粗の状態になってしまい、その状態で、射出工程において樹脂を射出すると、キャビティ空間内に十分な量の樹脂を充填することができなくなり、成形品にショート等の成形不良が発生してしまう。   In performing the automatic operation, the injection molding machine M starts from a mold closing operation, and at that time, manual weighing, that is, manual weighing is performed. In the manual weighing, there is no molded product formed in the cavity space, and no back pressure is applied to the heating cylinder. Accordingly, the resin stored in front of the screw becomes rough, and if the resin is injected in the injection process in that state, it becomes impossible to fill the cavity space with a sufficient amount of resin, and the molded product. In other words, molding defects such as shorts occur.

そこで、本発明の実施形態においては、表示装置付入力装置９を操作して、自動運転を開始する前に本発明に係る計量背圧設定を行う処理を実行する。本発明における手動計量は、図１に示されるシリンダ２７の先端に取り付けられたノズル３５を金型３２から離した状態で開始される。ノズル３５を金型３２から離して手動計量を行うのは、本発明に係る計量背圧設定の処理工程において、金型のキャビティ内に溶融樹脂が充填されるのを防ぐためである。計量背圧設定においてノズル３５から排出される溶融樹脂は図示しない容器に回収される。   Therefore, in the embodiment of the present invention, the process for performing the measurement back pressure setting according to the present invention is performed before the automatic operation is started by operating the input device 9 with a display device. Manual metering in the present invention is started in a state where the nozzle 35 attached to the tip of the cylinder 27 shown in FIG. The reason why the manual measurement is performed by separating the nozzle 35 from the mold 32 is to prevent the molten resin from being filled in the mold cavity in the measurement back pressure setting process according to the present invention. In the measurement back pressure setting, the molten resin discharged from the nozzle 35 is collected in a container (not shown).

図２は、背圧を設定する本発明のアルゴリズムを示すフローチャートである。以下、各ステップに従って説明する。
●［ステップＳＡ１００］背圧の初期値として背圧Ｂｐを設定する。
●［ステップＳＡ１０１］ノズルが金型から離れた状態で手動計量を開始する。
●［ステップＳＡ１０２］所定時間が経過したか否かを判断し、所定時間が経過すると、ステップＳＡ１０３へ移行する。
●［ステップＳＡ１０３］スクリュが計量位置まで下がるか否か判断し、計量位置まで下がる場合にはステップＳＡ１０４へ移行し、計量位置まで下がらない場合にはステップＳＡ１０６へ移行する。
●［ステップＳＡ１０４］背圧Ｂｐにαを加算した値を、新たな背圧Ｂｐとする。
●［ステップＳＡ１０５］溶融樹脂を排出し、ステップＳＡ１０１へ戻る。
●［ステップＳＡ１０６］成形条件の背圧をＢｐに設定し、射出成形サイクルを開始する。 FIG. 2 is a flowchart showing the algorithm of the present invention for setting the back pressure. Hereinafter, it demonstrates according to each step.
[Step SA100] The back pressure Bp is set as the initial value of the back pressure.
[Step SA101] Manual weighing is started with the nozzle away from the mold.
[Step SA102] It is determined whether or not a predetermined time has passed. When the predetermined time has passed, the process proceeds to Step SA103.
[Step SA103] It is determined whether or not the screw is lowered to the measurement position. If the screw is lowered to the measurement position, the process proceeds to Step SA104. If the screw is not lowered to the measurement position, the process proceeds to Step SA106.
[Step SA104] A value obtained by adding α to the back pressure Bp is set as a new back pressure Bp.
[Step SA105] The molten resin is discharged, and the process returns to Step SA101.
[Step SA106] The back pressure of the molding conditions is set to Bp, and the injection molding cycle is started.

１ 制御装置
２ プロセッサ
３ バス
４ サーボインタフェース
５ サーボアンプ
６ ＲＯＭ
７ ＲＡＭ
８ 表示装置付入力装置用インタフェース
９ 表示装置付入力装置
２０ 可動プラテン前後進モータ
２１ リアプラテン
２２ エジェクタ前後進モータ
２３ 可動プラテン
２４ タイバー
２５ 固定プラテン
２６ スクリュ
２７ シリンダ
２８ ホッパ
２９ ホッパシャッタ
３０ スクリュ回転モータ
３１ スクリュ前後進モータ
３２ 金型
３３ トグル機構
３４ エジェクタ機構
３５ ノズル
Ｍ 射出成形機
Ｍｂ 機台
Ｍｃ 型締部
Ｍｉ 射出部 1 Controller 2 Processor 3 Bus 4 Servo Interface 5 Servo Amplifier 6 ROM
7 RAM
DESCRIPTION OF SYMBOLS 8 Input device interface with a display device 9 Input device with a display device 20 Movable platen forward / reverse motor 21 Rear platen 22 Ejector forward / backward motor 23 Movable platen 24 Tie bar 25 Fixed platen 26 Screw 27 Cylinder 28 Hopper 29 Hopper shutter 30 Screw rotation motor 31 Screw Forward / backward motor 32 Mold 33 Toggle mechanism 34 Ejector mechanism 35 Nozzle M Injection molding machine Mb Machine base Mc Mold clamping part Mi Injection part

Claims (1)

射出成形機において、
ノズルを開放した状態で設定背圧により計量を行う計量制御手段と、
計量を行った際に所定時間内に計量位置まで計量動作が完了するか否かを判別する計量動作完了判別手段と、
を備え、
設定背圧を第一所定圧として計量を行い、所定時間内に計量位置まで計量動作が完了するか否かを判別し、スクリュが所定時間内に計量位置まで計量動作を完了する場合は設定背圧に第二所定圧を加算して新たな設定背圧として計量を行い、所定時間内に計量位置まで計量動作が完了するか否かを判別することを繰り返し、スクリュが所定時間内に計量位置まで後退しなかった時の設定背圧を計量時の背圧として設定することを特徴とする計量背圧設定手段を有する射出成形機。 In injection molding machine,
A weighing control means for weighing with a set back pressure with the nozzle open;
A weighing operation completion judging means for judging whether or not the weighing operation is completed up to the weighing position within a predetermined time when weighing is performed;
With
Weighing with the set back pressure as the first predetermined pressure, determine whether the weighing operation is completed to the weighing position within a predetermined time, and if the screw completes the weighing operation to the weighing position within the predetermined time, The second predetermined pressure is added to the pressure to measure as a new set back pressure, and it is repeatedly determined whether or not the weighing operation is completed up to the measuring position within the predetermined time. An injection molding machine having a measuring back pressure setting means, wherein a set back pressure when not retreating is set as a back pressure during measurement.
JP2010042040A 2010-02-26 2010-02-26 Injection molding machine having weighing back pressure setting means Expired - Fee Related JP4763081B1 (en)

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