JPH0745155B2 - Material injection method in electric injection device - Google Patents

Material injection method in electric injection device

Info

Publication number
JPH0745155B2
JPH0745155B2 JP9668787A JP9668787A JPH0745155B2 JP H0745155 B2 JPH0745155 B2 JP H0745155B2 JP 9668787 A JP9668787 A JP 9668787A JP 9668787 A JP9668787 A JP 9668787A JP H0745155 B2 JPH0745155 B2 JP H0745155B2
Authority
JP
Japan
Prior art keywords
injection
screw
electric
injection device
electric motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP9668787A
Other languages
Japanese (ja)
Other versions
JPS63262219A (en
Inventor
元麿 青木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP9668787A priority Critical patent/JPH0745155B2/en
Publication of JPS63262219A publication Critical patent/JPS63262219A/en
Publication of JPH0745155B2 publication Critical patent/JPH0745155B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/5092—Intrusion moulding, i.e. the screw rotates during injection
    • 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
    • B29C2045/1784—Component parts, details or accessories not otherwise provided for; Auxiliary operations not otherwise provided for
    • B29C2045/1792—Machine parts driven by an electric motor, e.g. electric servomotor

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】 ［産業上の利用分野］ この発明は合成樹脂の成形に用いられる電動式射出装置
における材料射出方法に関するものである。Description: TECHNICAL FIELD The present invention relates to a material injection method in an electric injection device used for molding a synthetic resin.

［従来の技術］ 一般に射出装置にはスクリユの回転を電動モーターによ
り行う電動式射出装置と、油圧モーターにより行う油圧
式射出装置とがある。電動式射出装置は射出シリンダ内
の逆止弁付きスクリユを前進移動させる油圧シリンダ
と、コンバータにより制御可能なスクリユ回転用の電動
モーターとを備えており、電動モーターの回転を減速歯
車により減速してスクリユに伝達している。[Prior Art] Generally, there are two types of injection devices: an electric injection device that rotates a screw using an electric motor and a hydraulic injection device that uses a hydraulic motor. The electric injection device is equipped with a hydraulic cylinder that moves the screw with check valve in the injection cylinder forward, and an electric motor for rotation of the screw that can be controlled by the converter. It is transmitted to Sukuryu.

また油圧式射出装置はスクリユを前進移動する油圧シリ
ンダと、スクリユを回転する油圧モーターとを備え、油
圧モーターの回転を減速することなくスクリユに伝達し
ている。Further, the hydraulic injection device includes a hydraulic cylinder that moves the screw forward and a hydraulic motor that rotates the screw, and transmits the rotation of the hydraulic motor to the screw without decelerating the rotation.

［発明が解決しようとする問題点］ 上記油圧式射出装置では、材料計量後に油圧モーターの
油圧路をバルブ装置により閉鎖して、油圧モーターの回
転を停止するとともに固定し、射出時におけるスクリユ
の回転を防止することができるが、電動式射出装置の場
合には、スクリユと電動モーターの間に減速歯車が介在
しているため、この減速歯車が多少なりとも摩耗してい
ると、射出圧によりスクリユが逆転する。この逆転は僅
かであるけれども計量材料の射出に影響を与え、射出量
のバラツキの原因となり、成形品の精密成形を困難なも
のとなす。[Problems to be Solved by the Invention] In the above hydraulic injection device, after the material is metered, the hydraulic passage of the hydraulic motor is closed by the valve device to stop and fix the rotation of the hydraulic motor, thereby rotating the screw during injection. However, in the case of an electric injection device, a reduction gear is interposed between the screw and the electric motor, so if the reduction gear is worn to some extent, the injection pressure causes the screw to rotate. Is reversed. Although this reversal is slight, it affects the injection of the metering material, causes variations in the injection amount, and makes precision molding of the molded product difficult.

この発明は上記電動式射出装置における問題点を解決す
るために考えられたものであって、その目的は簡単な手
段によってスクリユの逆転を防止することができ、また
逆止弁の摩耗による材料の逆流をも防止することができ
る新たな材料射出方法を提供することにある。The present invention was conceived in order to solve the problems in the above-mentioned electric injection device, and the purpose thereof is to prevent reverse rotation of the screw by simple means, and to prevent the material due to wear of the check valve. It is to provide a new material injection method capable of preventing backflow.

［問題点を解決するための手段］ 上記目的によるこの発明は、射出シリンダ内の逆止弁付
きスクリユを、減速歯車を介して電動モーターにより回
転する射出装置において、材料計量後の射出時に、電動
モーターに微電流を通電し、スクリユを正方向に極微速
回転することによって、上記問題点を解決してなる。[Means for Solving the Problems] The present invention according to the above-mentioned object is an injection device in which a check valve equipped with a check valve in an injection cylinder is rotated by an electric motor through a reduction gear, and when the injection is performed after the material is metered, it is electrically driven. The above problems are solved by supplying a slight current to the motor and rotating the screw in the forward direction at an extremely low speed.

［作用］ 上記方法にあっては、スクリユ前進と同時に生ずるスク
リユの極微速正回転によって、スクリユ周囲の溶融材料
に圧力が発生し、その圧力によって逆止弁が閉鎖する間
の計量材料の逆流が防止される。[Operation] In the method described above, pressure is generated in the molten material around the screw due to the extremely slow forward rotation of the screw that occurs simultaneously with the advance of the screw, and due to the pressure, the reverse flow of the metering material during the closing of the check valve occurs. To be prevented.

［実 施 例］ 成形条件 射出圧力 80Kg/cm2 射出時間 5.5秒 冷却時間 ８〃 型締め圧力 140Kg/cm2 加熱温度 ノズル 170度 加熱筒前部 220度 加熱筒中間 220度 加熱筒後部 180度 成形材料 66ナイロン 使用金型 テスト用スパイラル金型 使用スクリユの状態 スクリユ部分の先端より約1/2の長さのところまで、最
大0.3mm摩耗したスクリユ 電動モーター電流 ０〜100Hz（コンバータ制御） スクリユ回転 60〜120回転／分 射出時の電動モーター電流 0.5Hz スクリユ正方向回転 分速1/10回転 空出し材料の重量 22.88gr スパイラル成形品の重量（スプルを含む） ［発明の効果］ この発明は上述のように、材料計量後の射出時に電動モ
ーターに微電流を通電し、スクリユを正方向に極微速回
転して、計量材料の逆流を防止したことから、材料の射
出量が通常方法による場合よりも多くなり、電動式射出
装置であっても成形品質が優れた成形品を射出成形する
ことができる。また電動モーターに微電流を通電するだ
けでよいので、射出操作が複雑となるようなこともな
く、従来装置にも応用することができるなどの特徴を有
する。[Example] Molding conditions Injection pressure 80Kg / cm 2 Injection time 5.5 seconds Cooling time 8〃 Clamping pressure 140Kg / cm 2 Heating temperature Nozzle 170 degrees Heating cylinder front 220 degrees Heating cylinder middle 220 degrees Heating cylinder rear 180 degrees Molding Material 66 Nylon molds Spiral molds for testing Condition of screws used Screws worn by up to 0.3mm from the tip of the screw part up to 0.3mm Electric motor current 0-100Hz (converter control) screw rotation 60 ~ 120 rpm Electric motor current at injection 0.5 Hz Screw forward rotation in the forward direction 1/10 rpm Speed of empty material 22.88 gr Weight of spiral molded product (including sprue) [Effects of the Invention] As described above, according to the present invention, a small current is passed through the electric motor at the time of injection after the material is metered, and the screw is rotated in the forward direction at an extremely low speed to prevent the backflow of the material. The injection amount of is larger than that in the case of the normal method, and a molded product with excellent molding quality can be injection-molded even with an electric injection device. Further, since it is sufficient to supply a small current to the electric motor, the injection operation does not become complicated, and it can be applied to the conventional apparatus.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】射出シリンダ内の逆止弁付きスクリユを、
減速歯車を介して電動モーターにより回転する射出装置
において、材料計量後の射出時に、電動モーターに微電
流を通電し、スクリユを正方向に極微速回転することを
特徴とする電動式射出装置における材料射出方法。1. A screw with a check valve in an injection cylinder,
In an injection device that is rotated by an electric motor through a reduction gear, a small current is passed through the electric motor during injection after material measurement, and the screw is rotated in the forward direction at an extremely low speed. Injection method.
JP9668787A 1987-04-20 1987-04-20 Material injection method in electric injection device Expired - Lifetime JPH0745155B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9668787A JPH0745155B2 (en) 1987-04-20 1987-04-20 Material injection method in electric injection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9668787A JPH0745155B2 (en) 1987-04-20 1987-04-20 Material injection method in electric injection device

Publications (2)

Publication Number Publication Date
JPS63262219A JPS63262219A (en) 1988-10-28
JPH0745155B2 true JPH0745155B2 (en) 1995-05-17

Family

ID=14171704

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9668787A Expired - Lifetime JPH0745155B2 (en) 1987-04-20 1987-04-20 Material injection method in electric injection device

Country Status (1)

Country Link
JP (1) JPH0745155B2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03213320A (en) * 1990-01-18 1991-09-18 Fanuc Ltd Injection device for motorized injection molding machine
JP3686328B2 (en) * 2000-11-15 2005-08-24 住友重機械工業株式会社 Control method of injection molding machine
JP3848137B2 (en) * 2001-11-26 2006-11-22 住友重機械工業株式会社 Injection control device
JP4724096B2 (en) * 2006-11-21 2011-07-13 日精樹脂工業株式会社 Control method of injection molding machine
WO2016090274A1 (en) 2014-12-04 2016-06-09 Extrude To Fill, LLC Injection molding system and method of fabricating a component
AU2015357574B2 (en) 2014-12-04 2020-10-01 Extrude to Fill, Inc. Injection molding system and method of fabricating a component
AU2016362991B2 (en) * 2015-12-04 2019-07-11 Extrude to Fill, Inc. Method of molding a part

Also Published As

Publication number Publication date
JPS63262219A (en) 1988-10-28

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