JPH01146719A - Dwell pressure controlling method for injection molding and injection molding machine - Google Patents
Dwell pressure controlling method for injection molding and injection molding machineInfo
- Publication number
- JPH01146719A JPH01146719A JP30444087A JP30444087A JPH01146719A JP H01146719 A JPH01146719 A JP H01146719A JP 30444087 A JP30444087 A JP 30444087A JP 30444087 A JP30444087 A JP 30444087A JP H01146719 A JPH01146719 A JP H01146719A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- temperature
- holding pressure
- holding
- pressure control
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000001746 injection moulding Methods 0.000 title claims description 19
- 239000011347 resin Substances 0.000 claims abstract description 54
- 229920005989 resin Polymers 0.000 claims abstract description 54
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 230000000717 retained effect Effects 0.000 abstract 3
- 230000003321 amplification Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000035922 thirst Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 240000001980 Cucurbita pepo Species 0.000 description 1
- 235000009852 Cucurbita pepo Nutrition 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
-
- 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
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- 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
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
- B29C2045/773—Zero point correction
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は射出成形の保圧工程の保圧圧力制御に関し、さ
らに詳しくは、保圧工程すなわち射出二次圧力を加える
工程を終了する時点を金型に取付けた温度センサで検出
した樹脂温度または金型温度の変化を優先して決定する
よう制御して適切な時点で保圧工程を終了し充填が完了
したキャビティに必要以上の圧力を負荷することなく安
定した成形の実現を図る射出成形の保圧圧力制御に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to holding pressure control in the holding process of injection molding, and more specifically, to controlling the holding pressure at the end of the holding process, that is, the process of applying secondary injection pressure. The system prioritizes and determines the resin temperature or mold temperature change detected by a temperature sensor attached to the mold, ends the pressure holding process at an appropriate point, and applies more pressure than necessary to the filled cavity. This paper relates to holding pressure control for injection molding, which aims to achieve stable molding without causing any damage.
射出成形における主ヤビティ内への樹脂の充填完了後の
保圧工程の制御は成形品に不良現象が発生するか否かに
重要な影響を与えるため保圧工程制御には種々の工夫が
凝らされ、例えば保圧工程を多数の時間区間もしくは位
置区間に区分しそれぞれに対応Ｊる保圧区間を設定して
圧力制御を行うことにより薄肉から厚肉までの幅広い成
形品の成形を良好に行うことができることが知られてい
る。保圧工程を多段の保圧区間に区分して行う圧力制御
は通常は時間区間に対応して設定した一連の保圧圧力を
時間の進行と共にタイマにより次々と切換えて保圧圧力
を変化させるプログラムを用いるため充填工程完了から
経過した時間によりその時点の保圧圧力が規定され、同
じく充填工程完了から経過した時間により保圧圧力制御
が終了する時点が規定される。In injection molding, the control of the pressure holding process after filling the main cavity with resin has an important effect on whether or not defects occur in the molded product, so various measures have been taken to control the pressure holding process. For example, by dividing the pressure holding process into a large number of time sections or position sections, setting corresponding pressure holding sections for each, and controlling the pressure, it is possible to successfully mold a wide range of molded products from thin to thick walls. is known to be possible. Pressure control that divides the pressure holding process into multiple holding pressure intervals is usually a program that changes the holding pressure by switching a series of holding pressures set corresponding to time intervals one after another using a timer as time progresses. Since this is used, the time elapsed from the completion of the filling process defines the holding pressure at that point in time, and the time elapsed from the completion of the filling process similarly defines the time point at which the holding pressure control ends.
一般に、射出成形に使用する樹脂が異なれば溶融状態か
ら凝固に至るまでの樹脂温度やその過程での樹脂の状態
により適切な保圧１ｔｉｌＪ御の態様が賃なり、また使
用する樹脂の’６ｆｆｉや金型音調装置の作動状態等の
樹脂の物性以外の因子により樹脂が凝固するまでの時間
が異なるため、保圧工程における圧力制御時間をどのく
らいに定めればよいか判断するには相当な経験を要する
のが常である。特に、すでに樹脂が固化してしまった状
態で保圧（射出二次圧）をかけたままにしておくと成形
品に内部ひずみが生じるため成形品の強度が低下し外観
に欠陥が生ずる恐れがある。この内部ひずみは成形品の
物性を変化させ、例えば光学系の部品、レンズ、光学式
ディスク等では光の透過性が変化し大きな問題となる。In general, if the resin used for injection molding is different, the appropriate mode of holding pressure 1tilJ will be determined depending on the temperature of the resin from melting to solidification and the state of the resin during that process. Since the time it takes for the resin to solidify varies depending on factors other than the physical properties of the resin, such as the operating status of the mold tone adjustment device, it takes considerable experience to determine how long the pressure control time in the pressure holding process should be set. It is always necessary. In particular, if holding pressure (secondary injection pressure) is left applied when the resin has already solidified, internal distortion will occur in the molded product, which may reduce its strength and cause defects in appearance. be. This internal strain changes the physical properties of the molded product, such as optical system parts, lenses, optical discs, etc., and causes a change in light transmittance, which poses a major problem.
従来の区間設定による保圧圧力制御では樹脂の特性に合
致した例えば時間により進行する圧力制御プログラムを
設定するのが困難であったばかりか、特に樹脂が凝固を
終了して保圧工程を終了すべき時点が樹脂の容はヤ金型
音調装置の作動状態等の樹脂特性以外の外的な温度要因
により変動り゛るため樹脂の溶融−凝固状態と保圧工程
終了の時点とを完全に相関させることができず凝固した
樹脂に過剰な圧力を加え成形不良を招く事態を生じこの
解決が望まれていた。With conventional holding pressure control using interval settings, it is not only difficult to set a pressure control program that matches the characteristics of the resin, such as one that progresses over time. Since the resin volume at the time varies due to external temperature factors other than the resin characteristics such as the operating status of the mold tone adjustment device, it is necessary to completely correlate the melting/solidifying state of the resin with the end of the holding pressure process. A situation in which excessive pressure is applied to the solidified resin resulting in defective molding has been desired, and a solution to this problem has been desired.
本発明は保圧工程の圧力制御プログラムの進行に係りな
く樹脂温度があらかじめ設定した保圧終了温度に達した
ら保圧圧力をＵ口とし保圧工程を終了するよう制御する
保圧圧力制御を実現することを目的どする。The present invention realizes pressure holding pressure control that controls the holding pressure to be set to the U port and ends the holding process when the resin temperature reaches a preset holding pressure end temperature regardless of the progress of the pressure control program in the holding process. What is the purpose of doing?
本発明によれば、射出成形の保圧工程の保圧圧力を射出
シリンダ内の油圧調節により制御する圧力制御バルブの
開閉ｔ■をバルブ開閉量を指示する電気信号により制御
し、一方であらかじめ設定した一連の保圧区間にそれぞ
れ対応させて設定した一連の保圧圧力設定値をバルブ開
閉量を指示する一連の電気信号に変換し保圧区間を順次
１つずつ切換える毎にバルブ開閉量を指示する電気信号
を順次１つずつ切換えて圧力制御バルブの開閉量を変え
保圧圧力を変化させ、かつ他方で樹脂温度または金型温
度を温度センサで検出して変換した電気信号とあらかじ
め設定した保圧終了温度設定値に対応する電気信号とが
比較演算の結果一致すると保圧終了信号を出力し保圧圧
力をゼロとするよう制御することを特徴とする射出成形
の保圧圧力制御方法が提供される。According to the present invention, the opening/closing of the pressure control valve, which controls the holding pressure in the holding pressure process of injection molding by adjusting the hydraulic pressure in the injection cylinder, is controlled by an electric signal instructing the valve opening/closing amount, and is set in advance. A series of holding pressure setting values set corresponding to a series of holding pressure sections are converted into a series of electrical signals that instruct the valve opening/closing amount, and the valve opening/closing amount is instructed each time the holding pressure sections are changed one by one. The holding pressure is changed by changing the opening/closing amount of the pressure control valve one by one, and on the other hand, the resin temperature or mold temperature is detected by a temperature sensor and the converted electric signal and the preset holding pressure are switched one by one. Provided is a holding pressure control method for injection molding, characterized in that when an electric signal corresponding to a pressure end temperature set value matches as a result of a comparison calculation, a holding pressure end signal is output and the holding pressure is controlled to be zero. be done.
樹脂温面または金型混成を超音波を用いる温度センサで
検出すればキレビテイ内の樹脂に直接触れることなく正
確に樹脂温度または金型温度を検出することができ好適
である。It is preferable to detect the resin temperature surface or mold mixture with a temperature sensor using ultrasonic waves, since the resin temperature or mold temperature can be accurately detected without directly touching the resin in the mold.
さらに本発明によれば、射出成形機の射出シリンダ内の
保圧圧力を電気信号で指示されるバルブ開閉量により油
圧を調節して制御する圧力制御バルブと、一連の保圧区
間にそれぞれ対応させて設定した一連の保圧圧力設定値
をバルブ開閉量を指示する一連の電気信号に変換する区
間設定部および圧力設定部と、一方で保圧区間を順次１
つずつ切換える毎にバルブ開閉量を指示する電気信号を
順次１つずつ切換えかつ他方で保圧終了信号が入力する
と保圧圧力をゼロとする電気信号を出力する圧力制御部
と、樹脂温度または金型温度を検出する温度センサと、
検出した樹脂４Ｕまたは金型温度を電気信号に変換して
増幅する増幅器または検出した樹脂温度または金型温度
を電気信号に変換する変換器と、保圧終了温度設定値に
対応する電気部ｇを設定゛りる設定器と、樹脂温度また
は金型温度を変換した電気信号と保圧終了温度に対応す
る電気信号とを比較演ｔ１する比較演算部と、比較演算
の結果樹脂温度または金型温度を変換した電気信号と保
圧終了温度に対応する電気信号とが一致すると保圧終了
信号を出力する保圧終了信号出力部とから構成すること
を特徴とする保圧圧力制御ＩＩａ構を備える射出成形機
が提供される。Further, according to the present invention, a pressure control valve that controls the holding pressure in the injection cylinder of an injection molding machine by adjusting the hydraulic pressure according to the valve opening/closing amount instructed by an electric signal, and a series of holding pressure sections are respectively provided. an interval setting section and a pressure setting section that convert a series of holding pressure setting values set by
There is a pressure control section that sequentially switches the electrical signals that instruct the valve opening/closing amount one by one at each switching, and outputs an electrical signal that sets the holding pressure to zero when the holding pressure end signal is input. A temperature sensor that detects mold temperature;
An amplifier that converts the detected resin 4U or mold temperature into an electric signal and amplifies it, or a converter that converts the detected resin temperature or mold temperature into an electric signal, and an electric part G corresponding to the pressure-holding end temperature setting value. A setting device that performs setting, a comparison calculation unit that compares and performs a comparison t1 of an electric signal obtained by converting the resin temperature or mold temperature with an electric signal corresponding to the holding pressure end temperature, and a comparison calculation unit that compares and calculates the resin temperature or mold temperature as a result of the comparison calculation. and a pressure-holding end signal output section that outputs a pressure-holding end signal when the electrical signal converted from the pressure-holding end temperature matches the electrical signal corresponding to the end-of-holding temperature. A molding machine is provided.
射出成形の保圧工程は、−旦キャビティを充填し終った
後依然として高温溶融状態にある樹脂が冷却の進行によ
り体積の収縮を始めるのに対応して引き続き射出圧を保
持しスクリュあるいはプランジャの先端にまだ残ってい
る少♀の溶融樹脂（クツション母）をキャビティに送り
込み冷却にＪ：る収縮に見合う吊の樹脂を補給して成形
品の寸法不良や変形不 （良等の不良現象発生の抑制を
図るものであるが、保圧を終了すべき時点に近づくと樹
脂は溶融状態と凝固状態の中間の半流動状態あるいは半
凝固状態となっているため流動性は低下し特にプラスチ
ックレンズやオプチカルディスク簀の光学系の部品では
少量のクツション吊の樹脂を継続して充填するのに必要
な保圧圧力は相当強くする必要がある。このため適切な
時点で保圧を終了しないと成形品に必要以上の圧力がか
かり、過剰圧力ににる不良成形が発生する。保圧工程終
了時点を時間設定等のプログラムのみにより制御する従
来の保圧圧力制御と異なり、本発明の保圧圧力制御によ
れば保圧工程を終了すべき時点の樹脂の状態を適切に反
映する樹脂の温度を検出し樹脂本来の特性から客観的に
推考して設定できる保圧終了温度設定値と比較し両者が
一致するとプログラムの進行に優先して保圧工程を終了
させることができる。In the pressure holding process of injection molding, once the cavity has been filled, the resin, which is still in a high temperature molten state, begins to shrink in volume as it cools down, and the injection pressure is maintained at the tip of the screw or plunger. The small amount of molten resin (cushion base) still remaining in the mold is sent into the cavity for cooling, and the suspension resin is supplied to compensate for the shrinkage. However, as the holding pressure approaches the point at which the holding pressure should end, the resin enters a semi-fluid or semi-solidified state between the molten state and the solidified state, so the fluidity decreases, especially for plastic lenses and optical discs. In the optical system parts of the screen, the holding pressure required to continuously fill a small amount of cushion suspension resin must be quite strong.For this reason, if holding pressure is not stopped at an appropriate point, the molded product will not be able to hold the pressure. The above pressure is applied, resulting in defective molding due to excessive pressure.Unlike conventional packing pressure control in which the end point of the packing process is controlled only by programs such as time settings, the packing pressure control of the present invention For example, the temperature of the resin that appropriately reflects the state of the resin at the time when the pressure holding process should be ended is detected, and compared with the pressure holding end temperature setting value that can be set by objectively estimating from the resin's original characteristics, and if the two match. It is possible to finish the pressure holding process in priority to the progress of the program.
：実施例〕
以下に添付図面により本発明の具体的構成例についＣさ
らに詳細に説明するが、本発明は以下の実施例にのみ限
定されるものではない。:Examples] Specific configuration examples of the present invention will be described in more detail below with reference to the accompanying drawings, but the present invention is not limited only to the following examples.
第１図は本発明により構成した射出成形機の保圧圧力制
御系のブ１］ツク図、第２図は本発明の保圧圧力制御系
を備える射出成形機の要部断面図、第３図は本発明の保
圧圧力制御系の動作説明図である。FIG. 1 is a block diagram of the holding pressure control system of an injection molding machine constructed according to the present invention, FIG. The figure is an explanatory diagram of the operation of the holding pressure control system of the present invention.
まず、保圧工程仝休を３つの保圧区間に区分しそれぞれ
の保圧圧力設定値をＰｏ、Ｐｌ。First, the holding pressure process pause is divided into three holding pressure sections, and the holding pressure setting values for each are set as Po and Pl.
Ｐ２とし保圧圧力切換時点を充填完了からの時間により
ｔｌ 、ｔ２とし保圧終了時点を１３として第１図に示
す区間設定部−圧力設定部１により時間進行によるプロ
グラムを設定する。保圧終了温度設定値をＴとし成形に
使用する樹脂特性に合わＵ“て例えばＮｏ−ＦＬＯＷ渇
磨以不磨以下は固化温度となるよう設定器２により設定
する。Setting the holding pressure switching point to P2 as tl according to the time from the completion of filling, setting t2 as the holding pressure end point to 13, a time progression program is set by the interval setting section-pressure setting section 1 shown in FIG. The holding pressure end temperature set value is T, and is set by the setter 2 so that the solidification temperature is set for, for example, No-FLOW, from dry to dry, and below, according to the characteristics of the resin used for molding.
第２図に示すようにホッパ１０から自重により加熱シリ
ンダ１２内に落下した成形材料（樹脂）はバンドヒータ
１４による加熱を受【ノスクリュ１６の回転で混練され
ながら加熱シリンダ先端部へ送られるが、その過程で樹
脂は溶融状態となる。加熱シリンダ先端部に溶融樹脂が
貯えられるにつれスクリュは後退しｌ）Ｊ出シリンダ１
８内へは油タンクに接続した後退用ボート２０から油が
流入し、所定の位置でスクリュの回転が停止すると油の
流入が停止すると共に加熱シリンダ先端部には１回分の
射出最に相当する所定ωの溶融樹脂が充填される。前進
用ボート２２に接続した圧力制御バルブ（第２図には図
示せず）を調節して高圧油を送り込むとスクリュ１６は
高速で前進し金型２４により形成したキャビティ２６内
に溶融樹脂が射出され射出成形が進行する。As shown in FIG. 2, the molding material (resin) that falls from the hopper 10 into the heating cylinder 12 due to its own weight is heated by the band heater 14 [and is sent to the tip of the heating cylinder while being kneaded by the rotation of the nozzle screw 16]. During this process, the resin becomes molten. As the molten resin is stored at the tip of the heating cylinder, the screw retreats l) J-out cylinder 1
Oil flows into the tank 8 from the retreating boat 20 connected to the oil tank, and when the screw stops rotating at a predetermined position, the oil stops flowing and the tip of the heating cylinder is filled with one injection volume. A predetermined amount of molten resin is filled. When the pressure control valve (not shown in FIG. 2) connected to the forwarding boat 22 is adjusted to send high-pressure oil, the screw 16 moves forward at high speed and molten resin is injected into the cavity 26 formed by the mold 24. and injection molding proceeds.
割出充填完了後に保圧工程を開始するが、保圧工程初期
では樹脂温度は］−分高いため工程は時間により設定し
たプログラムにＪ：り第１図に示す圧力制御部３が圧力
−制御バルブ４の開閉岳を制御しつつ進行し、保圧圧力
は第３図に示すように初発保圧圧力Ｐｏから時間ｔ１の
時点でＰｌに切換わり時間ｔ２の時点でＰ２に切換わる
よう変化する。After index filling is completed, the pressure holding process is started, but at the beginning of the pressure holding process, the resin temperature is - minutes high, so the process follows the program set according to the time, and the pressure control unit 3 shown in Fig. 1 performs pressure control. The process proceeds while controlling the opening and closing of the valve 4, and the holding pressure changes from the initial holding pressure Po to Pl at time t1 and to P2 at time t2, as shown in Fig. 3. .
プログラムの進行とは別に樹脂温度または金型温度（樹
脂温度を反映する）を温度センサにより検出する。温度
センサは第２図に示づように例えば熱電対を用いる渇痕
センサあるいは赤外線検知式の温度センサのような一般
型渇度センサ２８を金型内に樹脂に直接触れるよう設置
する。一般型温度センサは樹脂のなるべく厚肉部を選ん
で設置すると効果的である。成形品の外観にレンリの痕
跡が残るのを嫌う場合は、超音波応用型温度センサ３０
を樹脂に直接触れないよう設置する。超音波応用型温度
センサ３０は金型外側から樹脂温度を直接測定すること
ができる。センサ設置位置は特にゲートあるいはゲート
付近のランナ部、キャビティ内がよい。Separately from the progress of the program, the resin temperature or mold temperature (reflecting the resin temperature) is detected by a temperature sensor. As a temperature sensor, as shown in FIG. 2, a general type thirst sensor 28, such as a thirst sensor using a thermocouple or an infrared detection type temperature sensor, is installed in the mold so as to be in direct contact with the resin. It is effective to install a general temperature sensor in the thickest part of the resin. If you do not want traces of moisture remaining on the exterior of the molded product, use the ultrasonic temperature sensor 30.
Install it so that it does not come into direct contact with the resin. The ultrasonic temperature sensor 30 can directly measure the resin temperature from outside the mold. The sensor installation location is particularly good at the gate, the runner near the gate, or inside the cavity.
時間の進行と共にキャビティ内の樹脂温度は次第に低下
するが、第１図に示すように温度センサ５で検出した温
度を増幅器または変換器６で増幅または変換した電気信
号とあらかじめ設定器２により設定した保圧終了温度設
定値（Ｔ）に対応する電気信号とが比較演算部７での比
較鋳口の結果一致すると保圧終了信号出力部８により保
圧終了信号９が出力され、圧力制御部３が圧力制御バル
ブ４を制御し第３図に示すように保圧圧力はプログラム
の進行に係りなくゼロとなる。As time progresses, the resin temperature inside the cavity gradually decreases, but as shown in FIG. When the electrical signal corresponding to the pressure-holding end temperature setting value (T) matches the result of the comparison gutter in the comparison calculation section 7, the pressure-holding end signal output section 8 outputs the pressure-holding end signal 9, and the pressure control section 3 controls the pressure control valve 4, and as shown in FIG. 3, the holding pressure becomes zero regardless of the progress of the program.
保圧圧力をゼロとし保圧工程を終了する時点を金型に取
付けた温度センサで検出した温度とあらかじめ設定した
保圧終了温度設定値とが一致した時点とすることににす
、保圧工程の終了を樹脂の状態を適切に反映する樹脂温
度に相関させて規定するととができるため、成形品に必
要以上の保圧が印加されず内部ひずみを低く抑えること
が可能となる。これにより内部ひずみに起因するそりや
光学系部品の光の透過率に影響を与える不良を解消でき
る。The holding pressure is set to zero and the holding process ends when the temperature detected by the temperature sensor attached to the mold matches the preset holding pressure end temperature setting. Since the end of molding can be defined in relation to the resin temperature that appropriately reflects the state of the resin, it is possible to prevent internal strain from being applied to the molded product without applying more holding pressure than necessary. This makes it possible to eliminate warpage caused by internal strain and defects that affect the light transmittance of optical system components.
第１図は本発明により構成した射出成形１尺の保圧圧力
制御系のブロック図、第２図は本発明の保圧圧力制御系
を備えるｑ１出成形機の要部断面図、第３図は本発明の
保圧圧力制御系の動作説明図である。
１・・・区間設定部−圧力設定部
２・・・設定器 ３・・・圧力制御部４・・
・圧力制御バルブ ５・・・温度センサ６・・・Ｊｊ
ｌＪ幅器または変１り器
７・・・比較演算部
８・・・保圧終了信号出力部
９・・・保圧終了信号 １０・・・ホッパ１２・・
・加熱シリンダ １４・・・バンドヒータ１６１１
．スクリュ １８・・・射出シリンダ２０・・
・後退用ボート ２２・・・前進用ボート２４・・
・金型 ２Ｇ・・・キャビティ２８・・・
一般望温瓜しン号Fig. 1 is a block diagram of a holding pressure control system for injection molding of 1 inch constructed according to the present invention, Fig. 2 is a sectional view of essential parts of a Q1 injection molding machine equipped with the holding pressure control system of the present invention, and Fig. 3 FIG. 2 is an explanatory diagram of the operation of the holding pressure control system of the present invention. 1... Section setting section - Pressure setting section 2... Setting device 3... Pressure control section 4...
・Pressure control valve 5...Temperature sensor 6...Jj
lJ width gauge or variable scale unit 7... Comparison calculation unit 8... Holding pressure end signal output unit 9... Holding pressure end signal 10... Hopper 12...
・Heating cylinder 14...Band heater 1611
．． Screw 18... Injection cylinder 20...
・Backward boat 22...Forward boat 24...
・Mold 2G...Cavity 28...
General Destiny Gourd Train
Claims (3)
の油圧調節により制御する圧力制御バルブの開閉量をバ
ルブ開閉量を指示する電気信号により制御し、一方であ
らかじめ設定した一連の保圧区間にそれぞれ対応させて
設定した一連の保圧圧力設定値をバルブ開閉量を指示す
る一連の電気信号に変換し保圧区間を順次１つずつ切換
える毎にバルブ開閉量を指示する電気信号を順次１つず
つ切換えて圧力制御バルブの開閉量を変え保圧圧力を変
化させ、かつ他方で樹脂温度または金型温度を温度セン
サで検出して変換した電気信号とあらかじめ設定した保
圧終了温度設定値に対応する電気信号とが比較演算の結
果一致すると保圧終了信号を出力し保圧圧力をゼロとす
るよう制御することを特徴とする射出成形の保圧圧力制
御方法。(1) The opening/closing amount of the pressure control valve, which controls the holding pressure in the holding pressure process of injection molding by adjusting the hydraulic pressure inside the injection cylinder, is controlled by an electric signal that instructs the opening/closing amount of the valve. A series of holding pressure setting values set corresponding to each pressure section is converted into a series of electrical signals that instruct the valve opening/closing amount, and an electric signal indicating the valve opening/closing amount is sent each time the holding pressure section is changed one by one. The holding pressure is changed by changing the opening/closing amount of the pressure control valve one by one, and on the other hand, the resin temperature or mold temperature is detected by a temperature sensor and converted into an electric signal and a preset holding pressure end temperature setting. A holding pressure control method for injection molding, characterized in that when the electric signal corresponding to the value matches as a result of comparison calculation, a holding pressure end signal is output and the holding pressure is controlled to be zero.
ンサで検出する特許請求の範囲第１項記載の射出成形の
保圧圧力制御方法。(2) The holding pressure control method for injection molding according to claim 1, wherein the resin temperature or the mold temperature is detected by a temperature sensor using ultrasonic waves.
号で指示されるバルブ開閉量により油圧を調節して制御
する圧力制御バルブと、一連の保圧区間にそれぞれ対応
させて設定した一連の保圧圧力設定値をバルブ開閉量を
指示する一連の電気信号に変換する区間設定部および圧
力設定部と、一方で保圧区間を順次１つずつ切換える毎
にバルブ開閉量を指示する電気信号を順次１つずつ切換
えかつ他方で保圧終了信号が入力すると保圧圧力をゼロ
とする電気信号を出力する圧力制御部と、樹脂温度また
は金型温度を検出する温度センサと、検出した樹脂温度
または金型温度を電気信号に変換して増幅する増幅器ま
たは検出した樹脂温度または金型温度を電気信号に変換
する変換器と、保圧終了温度設定値に対応する電気信号
を設定する設定器と、樹脂温度または金型温度を変換し
た電気信号と保圧終了温度に対応する電気信号とを比較
演算する比較演算部と、比較演算の結果樹脂温度または
金型温度を変換した電気信号と保圧終了温度に対応する
電気信号とが一致すると保圧終了信号を出力する保圧終
了信号出力部とから構成することを特徴とする保圧圧力
制御機構を備える射出成形機。(3) A pressure control valve that controls the holding pressure in the injection cylinder of the injection molding machine by adjusting the hydraulic pressure according to the valve opening/closing amount instructed by an electric signal, and a series of pressure control valves that are set corresponding to a series of holding pressure intervals. an interval setting section and a pressure setting section that convert the holding pressure setting value into a series of electrical signals that instruct the valve opening/closing amount, and an electric signal that instructs the valve opening/closing amount each time the holding pressure section is sequentially switched one by one. a pressure control unit that outputs an electric signal that sets the holding pressure to zero when a holding pressure end signal is input, a temperature sensor that detects the resin temperature or mold temperature, and a temperature sensor that detects the resin temperature or mold temperature. or an amplifier that converts the mold temperature into an electrical signal and amplifies it, or a converter that converts the detected resin temperature or mold temperature into an electrical signal, and a setting device that sets the electrical signal corresponding to the holding pressure end temperature set value. , a comparison calculation section that compares and calculates an electrical signal obtained by converting the resin temperature or mold temperature with an electrical signal corresponding to the pressure-holding end temperature, and a comparison calculation unit that compares and calculates the electric signal corresponding to the resin temperature or mold temperature converted and the holding pressure. An injection molding machine equipped with a holding pressure control mechanism, comprising a holding pressure end signal output section that outputs a holding pressure end signal when an electric signal corresponding to an end temperature matches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30444087A JPH01146719A (en) | 1987-12-03 | 1987-12-03 | Dwell pressure controlling method for injection molding and injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30444087A JPH01146719A (en) | 1987-12-03 | 1987-12-03 | Dwell pressure controlling method for injection molding and injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01146719A true JPH01146719A (en) | 1989-06-08 |
| JPH053973B2 JPH053973B2 (en) | 1993-01-19 |
Family
ID=17933034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30444087A Granted JPH01146719A (en) | 1987-12-03 | 1987-12-03 | Dwell pressure controlling method for injection molding and injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01146719A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006080125A1 (en) * | 2005-01-26 | 2006-08-03 | Michio Komatsu | Process for production of heat-resistant hollow articles made of polylactic acid-containing resin |
| US8309010B2 (en) | 2005-01-26 | 2012-11-13 | Michio Komatsu | Process for production of heat-resistant hollow article made of polylactic acid containing resin |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61255825A (en) * | 1985-05-08 | 1986-11-13 | Mitsubishi Heavy Ind Ltd | Method for changing over multistage injection pressure holding |
-
1987
- 1987-12-03 JP JP30444087A patent/JPH01146719A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61255825A (en) * | 1985-05-08 | 1986-11-13 | Mitsubishi Heavy Ind Ltd | Method for changing over multistage injection pressure holding |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006080125A1 (en) * | 2005-01-26 | 2006-08-03 | Michio Komatsu | Process for production of heat-resistant hollow articles made of polylactic acid-containing resin |
| JP2006205408A (en) * | 2005-01-26 | 2006-08-10 | Michio Komatsu | Manufacturing method of heat-resistant hollow body made of polylactic acid-containing resin |
| EP1849577A1 (en) * | 2005-01-26 | 2007-10-31 | Toshitaka Matsuoka | Process for production of heat-resistant hollow articles made of polylactic acid-containing resin |
| JP4511959B2 (en) * | 2005-01-26 | 2010-07-28 | 道男 小松 | Method for producing heat-resistant hollow body made of polylactic acid-containing resin |
| EP1849577A4 (en) * | 2005-01-26 | 2011-01-26 | Toshitaka Matsuoka | Process for production of heat-resistant hollow articles made of polylactic acid-containing resin |
| US8309010B2 (en) | 2005-01-26 | 2012-11-13 | Michio Komatsu | Process for production of heat-resistant hollow article made of polylactic acid containing resin |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH053973B2 (en) | 1993-01-19 |
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