JPH08318553A - Injection compression molding method - Google Patents
Injection compression molding methodInfo
- Publication number
- JPH08318553A JPH08318553A JP12779095A JP12779095A JPH08318553A JP H08318553 A JPH08318553 A JP H08318553A JP 12779095 A JP12779095 A JP 12779095A JP 12779095 A JP12779095 A JP 12779095A JP H08318553 A JPH08318553 A JP H08318553A
- Authority
- JP
- Japan
- Prior art keywords
- injection
- mold
- mold clamping
- resin
- screw
- 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
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
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は射出圧縮成形方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection compression molding method.
【０００２】[0002]
【従来の技術】従来、高圧の射出成形機では、図３に示
すように、射出スクリュを前進させスクリュヘッドの前
部に貯留された樹脂をキャビティ内へ射出充填すると、
射出スクリュの前進限の少し手前で余裕をもって一応射
出を完了し、キャビティ内に射出充填された樹脂が冷却
固化する過程で収縮するが、この収縮によりヒケが生じ
ないように射出スクリュを常に前進方向に押圧し樹脂に
一定時間保圧力を付加させた後、シャットオフバルブを
閉にするような充填制御がなされていた。こうした従来
の高圧射出成形方法では、一般的に計量された樹脂量は
充填量より大きいかまたは等しい程度にした状態で射出
が行なわれていた。2. Description of the Related Art Conventionally, in a high-pressure injection molding machine, as shown in FIG. 3, when an injection screw is moved forward and a resin stored in the front part of the screw head is injected and filled into a cavity,
The injection screw is completed slightly before the advance limit of the injection screw, and the resin injected and filled in the cavity shrinks as it cools and solidifies. The filling control was performed such that the shut-off valve was closed after the holding pressure was applied to the resin for a certain period of time by pressing against. In such a conventional high-pressure injection molding method, injection is generally performed in a state where the measured resin amount is larger than or equal to the filling amount.
【０００３】また、従来の低圧による射出圧縮成形方法
では、図４に示すように、可動金型と固定金型に型締力
を付加して両金型を型締めした状態で、金型キャビティ
内へ溶融樹脂を射出充填し、可動金型を圧縮代だけ後退
させた後、射出スクリュの前進限で保圧力を付加させる
とともに、直ちにシャットオフバルブを閉にするような
制御が行なわれていた。こうした、従来の射出圧縮成形
方法では、一般的に計量された樹脂量は充填量とほぼ等
しく、全量を金型キャビティ内に射出充填が行なわれて
いた。Further, in the conventional low-pressure injection compression molding method, as shown in FIG. 4, the mold cavity is clamped by applying a mold clamping force to the movable mold and the fixed mold, and the mold cavity is closed. The molten resin was injected and filled in, the movable mold was retracted by the compression allowance, the holding pressure was applied at the forward limit of the injection screw, and the shutoff valve was immediately closed. . In such a conventional injection compression molding method, generally, the measured resin amount is almost equal to the filling amount, and the entire amount is injected and filled in the mold cavity.
【０００４】[0004]
【発明が解決しようとする課題】ところが、前者の高圧
による射出成形方法では、型締された金型間で形成され
るキャビティ量より大きい容積の計量樹脂量が射出充填
されるため、両金型のパーティングラインからバリやオ
ーバーパックなどの成形不良を発生しやすいといった問
題があった。However, in the former high-pressure injection molding method, since the volume of the measured resin which is larger than the volume of the cavity formed between the clamped molds is injected and filled, both molds are injected. There was a problem that molding defects such as burrs and overpacks were likely to occur from the parting line.
【０００５】ところが、射出圧縮成形による一般的に製
品肉厚の薄い成形品を成形するような成形方法では、前
述したような高圧の射出成形方法と同様な方法で射出側
から金型キャビティ内に射出充填した樹脂に保圧をかけ
ることができず、充填量と等量の計量した全樹脂量を射
出スクリュを前進限まで前進させ、キャビティ内に射出
充填するために樹脂の射出充填量のバラツキが大きくな
り、計量時の樹脂のバラツキがそのまま充填量のバラツ
キに反映され、結果的に成形品の重量にバラツキが生じ
てしまい成形品の歩留まりが低下するといった問題があ
った。However, in a molding method for molding a molded product having a generally thin product thickness by injection compression molding, a method similar to the above-described high-pressure injection molding method is used to insert the molding material into the mold cavity from the injection side. Since the holding pressure cannot be applied to the injection-filled resin, the total amount of resin measured equal to the filling amount is advanced to the limit of the injection screw, and the injection-filling amount of resin varies in order to injection-fill the cavity. However, there is a problem in that the dispersion of the resin at the time of measurement is directly reflected in the dispersion of the filling amount, resulting in the dispersion of the weight of the molded product, which lowers the yield of the molded product.
【０００６】本発明は上記従来の問題点に鑑みてなされ
たもので、金型キャビティ内の射出充填量のバラツキを
なくすようにした射出圧縮成形方法を提供することを目
的とするものである。The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an injection compression molding method which eliminates the variation in the injection filling amount in the mold cavity.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明では、可動金型を固定金型に当接した状態で
溶融樹脂を射出充填し可動金型を所望の圧縮代以上に後
退させた際に、前記可動金型の移動量を位置センサによ
り検知し、射出スクリュの前進により樹脂に付加される
保圧力を型締力より小さくして、型締力を付加させつつ
樹脂を射出スクリュ側へ逆流させ、可動金型が設定され
た位置になった時シャットオフバルブを閉じるようにし
た。In order to achieve the above object, according to the present invention, a molten resin is injected and filled in a state where the movable mold is in contact with a fixed mold so that the movable mold has a desired compression amount or more. When retracted, the amount of movement of the movable mold is detected by the position sensor, and the holding pressure applied to the resin by the forward movement of the injection screw is made smaller than the mold clamping force, and the resin is applied while applying the mold clamping force. The shutoff valve was closed when the movable mold was brought to the set position by backflowing to the injection screw side.
【０００８】[0008]
【作用】射出装置内で溶融された樹脂量の計量が金型キ
ャビティ内へ射出充填される充填量より多いかまたは等
しい条件下で射出充填し、樹脂圧により押圧されて移動
した可動金型の金型離間距離δｎが初期設定された金型
離間距離δ0 より小さいか、または等しくなるように制
御し、δｎ≦δ0 となった時点でシャットオフバルブを
閉じるようにしたことにより、射出充填量のバラツキが
なくなる。The function of the movable mold moved by being pressed by the resin pressure and moved by injection-filling under the condition that the amount of the resin melted in the injection device is greater than or equal to the amount injected and filled in the mold cavity. By controlling the mold separation distance δn to be smaller than or equal to the initially set mold separation distance δ0 and closing the shut-off valve when δn ≦ δ0, the injection filling amount There is no variation.
【０００９】[0009]
【実施例】以下に、本発明に係る射出圧縮成形方法の具
体的実施例を図１ないし図３を用いて詳細に説明する。EXAMPLES Specific examples of the injection compression molding method according to the present invention will be described in detail below with reference to FIGS.
【００１０】図１は本発明の実施例に係る制御概念図、
図２は本発明の実施例に係る射出成形時の制御フロー図
を示す。FIG. 1 is a conceptual diagram of control according to an embodiment of the present invention,
FIG. 2 shows a control flow chart at the time of injection molding according to the embodiment of the present invention.
【００１１】固定金型３は図示しないマシンベースの一
端上に固着された固定盤５に取付けられており、一方マ
シンベースの他端部には前記固定盤５と対向して可動金
型２が可動盤４に取付けられている。The fixed mold 3 is attached to a fixed platen 5 fixed to one end of a machine base (not shown), while the movable mold 2 is provided at the other end of the machine base so as to face the fixed platen 5. It is attached to the movable platen 4.
【００１２】前記可動盤４の背面部には型締シリンダ６
内を前後動するピストン６ａとこのピストン６ａのピス
トンロッド６ｂの先端部に可動盤４が固着され、ピスト
ン６ａの前後に圧油を導入して可動盤４を前後動自在と
する構成となっている。符号３５はキャビティ部を示
す。A mold clamping cylinder 6 is provided on the rear surface of the movable platen 4.
The movable platen 4 is fixed to the piston 6a that moves back and forth inside and the tip of the piston rod 6b of this piston 6a, and the movable platen 4 is movable back and forth by introducing pressure oil before and after the piston 6a. There is. Reference numeral 35 indicates a cavity portion.
【００１３】符号１０は射出装置であって、この射出装
置１０はスクリュ１１、射出シリンダ１２、正逆転用モ
ータ１３、ホッパ１４ａおよびバレル１４から構成され
ている。Reference numeral 10 denotes an injection device, which is composed of a screw 11, an injection cylinder 12, a forward / reverse rotation motor 13, a hopper 14a and a barrel 14.
【００１４】バレル１４内にスクリュ１１が回転自在に
設けられ、ホッパ１４ａ内の樹脂原料が供給ゾーン、圧
縮ゾーンにおいて加熱圧縮され、計量ゾーンにおいて溶
融計量され、そして射出ゾーンを経てノズル１５内へ射
出されるように構成されている。A screw 11 is rotatably provided in a barrel 14, a resin raw material in a hopper 14a is heated and compressed in a supply zone and a compression zone, melt-measured in a measuring zone, and injected into a nozzle 15 through an injection zone. It is configured to be.
【００１５】そして、バレル１４の外周面には樹脂原料
を外部加熱するためのヒータが設けられており、樹脂原
料が溶融されながらスクリュ１１の回転によって前方へ
送られるようになっている。符号１１ａはスクリュヘッ
ドを示す。A heater for externally heating the resin raw material is provided on the outer peripheral surface of the barrel 14, and the resin raw material is sent forward by the rotation of the screw 11 while being melted. Reference numeral 11a indicates a screw head.
【００１６】符号１２は射出シリンダ、１２ａはピスト
ン、１３は正逆転用モータであってスクリュ１１に直結
されており、スクリュ１１を正逆回転するようになって
いる。Reference numeral 12 is an injection cylinder, 12a is a piston, and 13 is a forward / reverse rotation motor, which is directly connected to the screw 11 and rotates the screw 11 forward and backward.
【００１７】１７は制御部を示し、位置センサ７、金型
位置検出部１８、基準点設定部１９、比較制御部２０、
射出制御部２１、射出圧力検出部２２、型締圧力制御部
２３、型締圧検出部２４、入出力インターフェイス２
５、演算処理装置２６、記憶ユニット２７、入力キーボ
ード２８、表示部２９およびシャットオフバルブ制御部
３０から構成されている。Reference numeral 17 denotes a control unit, which is a position sensor 7, a mold position detection unit 18, a reference point setting unit 19, a comparison control unit 20,
Injection control unit 21, injection pressure detection unit 22, mold clamping pressure control unit 23, mold clamping pressure detection unit 24, input / output interface 2
5, an arithmetic processing unit 26, a storage unit 27, an input keyboard 28, a display unit 29, and a shutoff valve control unit 30.
【００１８】位置センサ７は金型位置検出部１８に接続
されている。また位置センサ７により射出充填前の可動
金型２の位置を基準点として設定する基準点設定部１９
と金型位置検出部１８が接続されているとともに、基準
点設定部１９の設定値と位置センサ７により圧縮工程中
の可動金型２の位置の金型位置検出部１８の検出信号を
比較して射出充填量の補正信号を出力する比較制御部２
０が接続され、この比較制御部２０は入出力インターフ
ェイス２５に接続されている。The position sensor 7 is connected to a mold position detector 18. A reference point setting unit 19 that sets the position of the movable mold 2 before injection filling as a reference point by the position sensor 7.
And the mold position detection unit 18 are connected, and the set value of the reference point setting unit 19 and the detection signal of the mold position detection unit 18 at the position of the movable mold 2 during the compression process are compared by the position sensor 7. Comparison control unit 2 for outputting a correction signal for the injection filling amount
0 is connected, and the comparison control unit 20 is connected to the input / output interface 25.
【００１９】また、射出シリンダ１２および正逆転用モ
ータ１３の駆動を制御する油圧制御弁１６と接続されて
いる射出制御部２１と射出シリンダ１２の油圧力を検知
する射出圧力検出部２２はそれぞれの入出力インターフ
ェイス２５に接続されている。The injection control section 21 connected to the hydraulic control valve 16 for controlling the drive of the injection cylinder 12 and the forward / reverse rotation motor 13 and the injection pressure detection section 22 for detecting the oil pressure of the injection cylinder 12 are respectively provided. It is connected to the input / output interface 25.
【００２０】型締圧検出部２４は型締シリンダ６の駆動
を制御する油圧制御弁８に接続され、さらに型締圧力制
御部２３は入出力インターフェイス２５に接続されてい
る。The mold clamping pressure detector 24 is connected to a hydraulic control valve 8 for controlling the drive of the mold clamping cylinder 6, and the mold clamping pressure controller 23 is connected to an input / output interface 25.
【００２１】また、型締シリンダ６の油圧力を検知する
型締圧検出部２４は入出力インターフェイス２５に接続
されている。The mold clamping pressure detector 24 for detecting the hydraulic pressure of the mold clamping cylinder 6 is connected to the input / output interface 25.
【００２２】符号３１は射出開始位置と射出完了位置を
知らせるために設けられたスクリュ位置検出部３１であ
り、このスクリュ位置検出部３１は入出力インターフェ
イス２５に接続されている。Reference numeral 31 is a screw position detection unit 31 provided for notifying the injection start position and the injection completion position, and this screw position detection unit 31 is connected to the input / output interface 25.
【００２３】一方、型締シリンダ６と射出シリンダ１２
およびシャットオフバルブ３２の各駆動部へ出力する制
御記号の入出力を行なう入出力インターフェイス２５と
設定条件を記憶する記憶ユニット２７および設定値と検
出記号を比較演算処理して制御信号を出力する演算処理
装置２６が設けられている。符号２８は入力キーボー
ド、２９は表示部を示す。On the other hand, the mold clamping cylinder 6 and the injection cylinder 12
And an input / output interface 25 for inputting and outputting a control symbol to be output to each drive unit of the shutoff valve 32, a storage unit 27 for storing the setting condition, and a calculation for comparing the set value and the detection symbol and outputting a control signal. A processing device 26 is provided. Reference numeral 28 indicates an input keyboard, and 29 indicates a display unit.
【００２４】なお、記憶ユニット２７には、型圧縮力、
保圧力の入力値を設定値として記憶しておく。The storage unit 27 has a mold compression force,
The holding pressure input value is stored as a set value.
【００２５】以上述べた射出圧縮成形装置を用いた制御
方法を説明する。A control method using the injection compression molding apparatus described above will be described.
【００２６】本実施例では、あらかじめ閉鎖された金型
２、３内に溶融樹脂を充填し、その後型締側で圧縮を行
なう低圧の射出圧縮方法について述べる。In this embodiment, a low-pressure injection compression method will be described in which the molds 2 and 3 which have been closed in advance are filled with a molten resin, and then compression is performed on the mold clamping side.
【００２７】まず、図１および図２に示す実施例１にお
いて型締シリンダ６に圧油を導入して可動金型２を固定
金型３側へ前進移動させる。First, in the first embodiment shown in FIGS. 1 and 2, pressure oil is introduced into the mold clamping cylinder 6 to move the movable mold 2 forward toward the fixed mold 3.
【００２８】可動金型２と固定金型３とがタッチした
後、型締圧検出部２４で検出した油圧値により油圧制御
弁８を制御して型締シリンダ６へ圧油を送油し、初期に
設定された型締力となるように可動金型２を固定金型３
側へ押圧し型締昇圧を行なう。After the movable mold 2 and the fixed mold 3 are touched, the hydraulic pressure control valve 8 is controlled by the hydraulic pressure value detected by the mold clamping pressure detector 24 to send the pressure oil to the mold clamping cylinder 6, The movable mold 2 is fixed to the fixed mold 3 so that the mold clamping force set to the initial value is obtained.
Press to the side to increase the mold clamping pressure.
【００２９】ここで位置センサ７からの検出信号を金型
位置検出部１８で受けて、基準点として基準点設定部１
９へ設定される。この場合の基準点の設定は、型締昇圧
後の可動金型２の所定後退位置としておく。Here, the detection signal from the position sensor 7 is received by the mold position detection unit 18, and the reference point setting unit 1 is used as a reference point.
Set to 9. In this case, the reference point is set at a predetermined retracted position of the movable mold 2 after the mold clamping pressure is increased.
【００３０】一方、スクリュ１１の前後進位置をスクリ
ュ位置検出部３１で検知することにより射出充填量を規
定しておく。そして、型締昇圧が設定値に達した後、射
出圧力検出部２２で油圧値を検出しつつ、射出制御部２
１を介して、油圧制御弁１６を制御して、正逆転用モー
タ１３および射出シリンダ１２のピストンを駆動させ
て、可動金型２および固定金型３とで形成されたキャビ
ティ部３５内へ射出充填を行なう。射出充填に伴い、射
出充填された樹脂圧と型締シリンダ６で付加した型締力
のバランスにより、可動金型２は固定金型３に対して離
間する方向へ移動する（型開挙動）。そして、射出完了
と同時にスクリュ１１の前進限位置を保持させたままキ
ャビティ部３５内に充填された樹脂に保圧力を付加する
のである。On the other hand, the injection filling amount is defined by detecting the forward / backward movement position of the screw 11 by the screw position detection unit 31. Then, after the mold clamping pressure increase reaches the set value, the injection control unit 2 detects the hydraulic pressure value with the injection pressure detection unit 22.
1, the hydraulic control valve 16 is controlled to drive the forward / reverse rotation motor 13 and the piston of the injection cylinder 12 to inject into the cavity portion 35 formed by the movable mold 2 and the fixed mold 3. Fill. Along with the injection filling, the movable mold 2 moves in a direction away from the fixed mold 3 due to the balance between the resin pressure injected and the mold clamping force applied by the mold clamping cylinder 6 (mold opening behavior). Then, at the same time as the injection is completed, the holding pressure is applied to the resin filled in the cavity 35 while keeping the forward limit position of the screw 11.
【００３１】この時、射出シリンダ１２に付加する保圧
力の設定は、型締シリンダ６に付加された型締力の設定
に対して次の式に従うように設定する。At this time, the holding pressure applied to the injection cylinder 12 is set according to the following equation with respect to the setting of the mold clamping force applied to the mold clamping cylinder 6.
【００３２】[0032]
【数１】[Equation 1]
【００３３】ここで、可動金型２が固定金型３に対して
どの程度離間したか、その変化量δｎを位置センサ７で
検出し、金型位置検出部１８でキャビティ部３５内への
射出充填量が適切であったかどうかを判断させるため、
あらかじめ基準点設定部１９に入力した金型離間距離設
定値δ0 との比較演算を比較制御部２０により行なう。The position sensor 7 detects how much the movable mold 2 is separated from the fixed mold 3 by a position sensor 7, and the mold position detector 18 injects it into the cavity 35. In order to judge whether the filling amount was appropriate,
The comparison control unit 20 performs a comparison calculation with the mold separation distance setting value δ0 input to the reference point setting unit 19 in advance.
【００３４】この比較演算の結果δｎ＞δ0 であれば、
射出シリンダ１２への保圧力と型締シリンダ６への型締
力をかけ続け、可動金型２位置を位置センサ７で検出
し、この検出信号を金型位置検出部１８で受け、基準点
設定部１９の設定値と比較してδｎ≦δ0 となるまで比
較演算を繰返す。If the result of this comparison operation is δn> δ0,
The holding pressure to the injection cylinder 12 and the mold clamping force to the mold clamping cylinder 6 are continuously applied, the position of the movable mold 2 is detected by the position sensor 7, and the detection signal is received by the mold position detector 18 to set the reference point. Compared with the set value of the section 19, the comparison operation is repeated until δn ≦ δ0.
【００３５】なお、キャビティ部３５へ射出充填された
溶融樹脂は、前述した式で示されるように設定されてい
るため、ノズル１５を介して射出装置１０側へ押戻され
る。Since the molten resin injected and filled in the cavity 35 is set as shown by the above-mentioned formula, it is pushed back to the injection device 10 side through the nozzle 15.
【００３６】この比較演算の結果、δｎ＞δ0 であれ
ば、型締シリンダ６側の油圧値を若干上昇させるように
型締圧検出部２４で油圧値を検出しつつ型締圧力制御部
２３へ指令を出す。If δn> δ0 as a result of this comparison calculation, the mold clamping pressure detection unit 24 detects the hydraulic pressure value so as to slightly increase the hydraulic pressure value on the mold clamping cylinder 6 side, and then the mold clamping pressure control unit 23 is detected. Issue a command.
【００３７】型締力（型締油圧×型締シリンダ用ピスト
ン投影面積）の増加により可動金型２の後退限が規制さ
れる。こうして後退限を規制された可動金型２位置を再
び位置センサ７で検出し、この検出信号を金型位置検出
部１８で受け、基準点設定部１９の設定値と再度比較し
て可動金型２と固定金型３との離間距離δｎが、δｎ≦
δ0 となるまで繰返し補正される。The increase of the mold clamping force (mold clamping hydraulic pressure × projection area of the piston for the mold clamping cylinder) restricts the retreat limit of the movable mold 2. In this way, the position of the movable mold 2 in which the backward limit is restricted is detected again by the position sensor 7, and the detection signal is received by the mold position detecting unit 18, which is again compared with the set value of the reference point setting unit 19 to move the movable mold. The separation distance δn between 2 and the fixed mold 3 is δn ≦
It is repeatedly corrected until it reaches δ0.
【００３８】なお、キャビティ部３５へ射出充填された
溶融樹脂は、δｎ＜δ0 となるように射出条件を満足す
るまで型締力が増加されるため、一旦キャビティ部３５
へ射出充填された樹脂はノズル１５を介して射出装置１
０側へ押戻される。Since the mold clamping force of the molten resin injected and filled in the cavity 35 is increased until the injection condition is satisfied so that δn <δ0, the cavity 35 is temporarily
The resin injected and filled into the injection device 1 through the nozzle 15
Pushed back to the 0 side.
【００３９】こうして、δｎ≦δ0 の金型離間距離が満
足されてキャビティ部３５内の溶融樹脂が適正になる
と、入出力インターフェイス２５からの指令がシャット
オフバルブ制御部３０へ出され、シャットオフバルブ３
２が９０度回動されキャビティ部３５と射出装置１０側
の樹脂が遮断される。In this way, when the mold separation distance of δn ≦ δ0 is satisfied and the molten resin in the cavity 35 becomes appropriate, a command from the input / output interface 25 is issued to the shutoff valve control unit 30 to shut off the shutoff valve. Three
2 is rotated by 90 degrees, and the cavity 35 and the resin on the injection device 10 side are shut off from each other.
【００４０】この後、射出装置１０側では、図１中のピ
ストン１２ａの左部側に圧油を導入させつつ正逆転用モ
ータ１３を回動させるとスクリュ１１は回動後退し、ス
クリュヘッド１１ａの前方へ溶融樹脂が貯留される。Thereafter, on the injection device 10 side, when the forward / reverse rotation motor 13 is rotated while introducing pressure oil to the left side of the piston 12a in FIG. 1, the screw 11 is rotated and retracted, and the screw head 11a. The molten resin is stored in front of.
【００４１】一方、金型２、３側ではキャビティ部３５
内へ射出充填された樹脂に対しては、型締シリンダ６の
型締圧により可動金型２を固定金型３側へ再び押圧させ
て型締側で圧縮工程を行なう。この場合、型締シリンダ
６で発生させる型締力は、射出充填前に設定した型締力
を持続する。On the other hand, on the molds 2 and 3 side, the cavity 35 is formed.
For the resin injected and filled in, the movable mold 2 is pressed again toward the fixed mold 3 by the mold clamping pressure of the mold clamping cylinder 6, and the compression process is performed on the mold clamping side. In this case, the mold clamping force generated by the mold clamping cylinder 6 continues the mold clamping force set before injection filling.
【００４２】型締側での圧縮工程完了後、油圧制御弁８
を制御して、型締シリンダ６の型締圧を除去して製品取
出しを行なうが、キャビティ部３５に充填された溶融樹
脂が冷却固化されるまで、型締側からの圧縮力が継続さ
れていなければならない。After the completion of the compression process on the mold clamping side, the hydraulic control valve 8
Is controlled to remove the mold clamping pressure of the mold clamping cylinder 6 and take out the product, but the compression force from the mold clamping side is continued until the molten resin filled in the cavity 35 is cooled and solidified. There must be.
【００４３】なお、実施例では可動金型２が射出充填さ
れる樹指圧に押圧され後退する、いわゆる低圧射出圧縮
成形について述べたが、最初から樹脂の圧縮代だけ可動
金型２を後退させた状態で樹脂を射出充填するようにし
た射出プレス成形についても実施可能である。In the embodiment, the so-called low pressure injection compression molding in which the movable mold 2 is pressed and retracted by the pressure applied by the resin is described, but the movable mold 2 was retracted from the beginning by the compression margin of the resin. It is also possible to perform injection press molding in which resin is injection-filled in the state.
【００４４】[0044]
【発明の効果】以上説明したことからも明らかなよう
に、本発明では、可動金型を固定金型に当接した状態で
溶融樹脂を射出充填し可動金型を所望の圧縮代以上に後
退させた際に、前記可動金型の移動量を位置センサによ
り検知し、射出スクリュの前進により樹脂に付加される
保圧力を型締力より小さくして、型締力を付加させつつ
樹脂を射出スクリュ側へ逆流させ、可動金型が設定され
た位置になった時シャットオフバルブを閉じるようにし
たことにより、キャビティ内に射出充填された樹脂量を
制御できるため、射出充填された樹脂のバラツキがなく
なりきわめて高品質の製品を安定して生産することがで
きる。また、射出充填時にキャビティ内容積以上の樹脂
を射出することにより、より低い型締力で金型キャビテ
ィ内に樹脂を充満調整することができ、安定して良品を
供給することができる。As is apparent from the above description, in the present invention, molten resin is injected and filled in a state where the movable mold is in contact with the fixed mold and the movable mold is retracted more than a desired compression margin. At this time, the moving amount of the movable mold is detected by the position sensor, the holding pressure applied to the resin by the advance of the injection screw is made smaller than the mold clamping force, and the resin is injected while applying the mold clamping force. The amount of resin injected into the cavity can be controlled by backflowing to the screw side and closing the shutoff valve when the movable mold reaches the set position. It is possible to stably produce extremely high quality products. Further, by injecting a resin having a volume larger than the cavity volume during injection filling, the resin can be filled and adjusted in the die cavity with a lower mold clamping force, and a good product can be stably supplied.
【図１】本発明の実施例に係る制御概念図である。FIG. 1 is a control conceptual diagram according to an embodiment of the present invention.
【図２】本発明の実施例に係る射出圧縮成形時の制御フ
ロー図である。FIG. 2 is a control flow chart at the time of injection compression molding according to the embodiment of the present invention.
【図３】従来の通常の射出成形方法のフロー図である。FIG. 3 is a flow chart of a conventional normal injection molding method.
【図４】従来の射出圧縮成形方法のフロー図である。FIG. 4 is a flow chart of a conventional injection compression molding method.
２ 可動金型 ３ 固定金型 ４ 可動盤 ５ 固定盤 ６ 型締シリンダ ６ａ ピストン ６ｂ ピストンロッド ７ 位置センサ ８ 油圧制御弁 １０ 射出装置 １１ スクリュ １１ａ スクリュヘッド １２ 射出シリンダ １３ 正逆転用モータ １４ バレル １４ａ ホッパ １５ ノズル １６ 油圧制御弁 １７ 制御部 １８ 金型位置検出部 １９ 基準点設定部 ２０ 比較制御部 ２１ 射出制御部 ２２ 射出圧力検出部 ２３ 型締圧力制御部 ２４ 型締圧検出部 ２５ 入出力インターフェイス ２６ 演算処理装置 ２７ 記憶ユニット ２８ 入力キーボード ２９ 表示部 ３０ シャットオフバルブ制御部 ３１ スクリュ位置検出部 ３２ シャットオフバルブ ３５ キャビティ部 2 movable mold 3 fixed mold 4 movable plate 5 fixed plate 6 mold clamping cylinder 6a piston 6b piston rod 7 position sensor 8 hydraulic control valve 10 injection device 11 screw 11a screw head 12 injection cylinder 13 forward / reverse rotation motor 14 barrel 14a hopper 15 nozzles 16 hydraulic control valve 17 control unit 18 mold position detection unit 19 reference point setting unit 20 comparison control unit 21 injection control unit 22 injection pressure detection unit 23 mold clamping pressure control unit 24 mold clamping pressure detection unit 25 input / output interface 26 Processing unit 27 Storage unit 28 Input keyboard 29 Display unit 30 Shut-off valve control unit 31 Screw position detection unit 32 Shut-off valve 35 Cavity unit
Claims (1)
融樹脂を射出充填し可動金型を所望の圧縮代以上に後退
させた際に、前記可動金型の移動量を位置センサにより
検知し、射出スクリュの前進により樹脂に付加される保
圧力を型締力より小さくして、型締力を付加させつつ樹
脂を射出スクリュ側へ逆流させ、可動金型が設定された
位置になった時シャットオフバルブを閉じるようにした
ことを特徴とする射出圧縮成形方法。1. A position sensor that measures the amount of movement of the movable mold when the movable mold is injected and filled with the movable mold in contact with the fixed mold and the movable mold is retracted beyond a desired compression margin. Detected by, the holding pressure applied to the resin due to the advance of the injection screw is made smaller than the mold clamping force, the resin is made to flow back to the injection screw side while applying the mold clamping force, and the movable mold is set at the set position. The injection compression molding method is characterized in that the shut-off valve is closed when the temperature becomes low.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12779095A JP3232547B2 (en) | 1995-05-26 | 1995-05-26 | Injection compression molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12779095A JP3232547B2 (en) | 1995-05-26 | 1995-05-26 | Injection compression molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08318553A true JPH08318553A (en) | 1996-12-03 |
| JP3232547B2 JP3232547B2 (en) | 2001-11-26 |
Family
ID=14968751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12779095A Expired - Fee Related JP3232547B2 (en) | 1995-05-26 | 1995-05-26 | Injection compression molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3232547B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0867266A3 (en) * | 1997-03-26 | 1999-06-09 | Takata Corporation | Resin bag and manufacturing method thereof |
| CN108015966A (en) * | 2018-02-06 | 2018-05-11 | 唐守林 | A kind of Coinjection molding apparatus |
-
1995
- 1995-05-26 JP JP12779095A patent/JP3232547B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0867266A3 (en) * | 1997-03-26 | 1999-06-09 | Takata Corporation | Resin bag and manufacturing method thereof |
| CN108015966A (en) * | 2018-02-06 | 2018-05-11 | 唐守林 | A kind of Coinjection molding apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3232547B2 (en) | 2001-11-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4208176A (en) | Time independent cycle control for plastic injection molding machines | |
| EP0365684B1 (en) | Molding method and molding apparatus by use of injection-compression molding machine | |
| JPH0825437A (en) | Injection molding method and machine | |
| JP2883140B2 (en) | Injection molding machine filling detection method | |
| JP3232547B2 (en) | Injection compression molding method | |
| KR20170038159A (en) | Injection molding machine | |
| JP2639571B2 (en) | Injection molding method | |
| JP2917089B2 (en) | Control method of injection molding machine | |
| JP3293425B2 (en) | Injection low pressure molding method and apparatus | |
| JP2649111B2 (en) | Injection unit of injection molding machine | |
| JP3293415B2 (en) | How to set the optimal filling resin amount for injection compression molding | |
| JPH04263917A (en) | Measuring method of back-flow rate in injection molding machine | |
| JP3154382B2 (en) | Injection compression molding method and apparatus | |
| JP3232550B2 (en) | Control method of mold clamping pressure in injection compression molding | |
| JP3179305B2 (en) | Injection compression molding method and apparatus | |
| JP5531814B2 (en) | Injection molding method | |
| JP3282433B2 (en) | Injection compression molding method and apparatus having toggle mechanism | |
| JPH08300428A (en) | Injection molding machine | |
| JP3161579B2 (en) | Control method of injection compression molding | |
| JPH079518A (en) | Injection compression molding method in injection molding machine having toggle type mold clamping mechanism | |
| JPH0929805A (en) | Controlling method for mold clamping force in injection compression molding | |
| JPH0939060A (en) | Method of controlling mold clamping pressure in injection molding | |
| JPH0957807A (en) | Controlling method for mold clamping pressure of injection compression molding | |
| JPH0764002B2 (en) | Measuring method of injection molding machine | |
| JPH0976314A (en) | Control method for clamping pressure in injection compression molding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |