JPH0367854B2 - - Google Patents
Info
- Publication number
- JPH0367854B2 JPH0367854B2 JP17869687A JP17869687A JPH0367854B2 JP H0367854 B2 JPH0367854 B2 JP H0367854B2 JP 17869687 A JP17869687 A JP 17869687A JP 17869687 A JP17869687 A JP 17869687A JP H0367854 B2 JPH0367854 B2 JP H0367854B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- injection
- screw
- mold
- setting device
- 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
Links
- 238000002347 injection Methods 0.000 claims description 48
- 239000007924 injection Substances 0.000 claims description 48
- 238000001746 injection moulding Methods 0.000 claims description 4
- 239000011347 resin Substances 0.000 description 24
- 229920005989 resin Polymers 0.000 description 24
- 238000000034 method Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002994 raw material 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
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
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】 本発明は射出成形機に関する。[Detailed description of the invention] The present invention relates to an injection molding machine.
射出成形機において、金型内の樹脂圧力は成形
品品質と相関関係が大きいので、成形品品質を向
上または品質おバラツキを少くするために金型内
の樹脂圧力をコントロールすることが考えられ
る。この方法として、金型内の圧力センサーを挿
入して、金型内の樹脂圧力を直接検出し、この圧
力があらかじめ設定した圧力に達すると、射出油
圧を高圧から低圧に切換えて金型内の最高樹脂圧
力が一定になるようにコントロールし、成形品品
質のバラツキを少くする方法がある。この方法で
は、金型毎に圧力センサーを取付るための加工が
必要なこと、また金型によつては取付けのための
加工ができないものがあるという欠点がある。こ
の欠点をなくするために、射出油圧を検出して、
この圧力をあらかじめ設定して圧力に達すると、
射出油圧を高圧から低圧に切換える方法がある
が、この場合、金型内の溶融樹脂を高速で充填す
る過程で、金型内の樹脂の流動抵抗によつて射出
油圧が設定値に達し、（第２図Ａ点）金型内に樹
脂が未充填の状態で射出油圧が高圧から低圧に切
換わるため完全な成形品が得られないという不具
合が発生することがある。 In an injection molding machine, the resin pressure within the mold has a strong correlation with the quality of the molded product, so it is conceivable to control the resin pressure within the mold in order to improve the quality of the molded product or reduce quality variations. This method involves inserting a pressure sensor inside the mold to directly detect the resin pressure inside the mold, and when this pressure reaches a preset pressure, the injection hydraulic pressure is switched from high pressure to low pressure. There is a way to control the maximum resin pressure to be constant and reduce variations in molded product quality. This method has the disadvantage that processing is required to attach the pressure sensor to each mold, and some molds cannot be processed for attachment. In order to eliminate this drawback, the injection oil pressure can be detected and
Set this pressure in advance and once the pressure is reached,
There is a method of switching the injection oil pressure from high pressure to low pressure, but in this case, during the process of filling the mold with molten resin at high speed, the injection oil pressure reaches the set value due to the flow resistance of the resin in the mold, and ( (Point A in Figure 2) Since the injection hydraulic pressure is switched from high pressure to low pressure when the mold is not filled with resin, a problem may occur in which a perfect molded product cannot be obtained.
そこで本発明は上述の欠点を除くことを目的と
し、金型内の樹脂の圧力をコントロールするため
に、射出油圧があらかじめ設定した油圧に達した
時に、射出油圧を高圧から低圧に切換える方法に
おいて、金型内に溶融樹脂を高速で充填する間に
射出油圧が設定値に達しても、射出油圧が高圧か
ら低圧に切換わらないように、スクリユストロー
クの範囲を設定できるようにし、スクリユストロ
ークがその範囲内にあり、なおかつ油圧が設定値
に達していると高圧から保持圧に切換わるように
射出圧力を制御しうる射出成形機に係り、射出油
圧により金型内の樹脂圧力をコントロールするの
で金型毎に圧力センサーを取付る必要がなくな
り、又、射出油圧により金型内の圧力をコントロ
ールする時に、スクリユがあらかじめ設定した位
置に到達し、なおかつ射出油圧が設定値に達した
時に射出油圧を高圧から低圧に切換えるようにし
たことにより、金型内の樹脂が充満していない状
態での高速射出時に樹脂の流動抵抗によつて射出
油圧が設定値に達して低圧に切換わるという不具
合を解消することができるものである。 Therefore, the present invention aims to eliminate the above-mentioned drawbacks, and provides a method of switching the injection oil pressure from high pressure to low pressure when the injection oil pressure reaches a preset oil pressure in order to control the pressure of the resin in the mold. Even if the injection oil pressure reaches a set value while filling the mold with molten resin at high speed, the screw stroke range can be set so that the injection oil pressure does not switch from high pressure to low pressure. This relates to an injection molding machine that can control the injection pressure so that it switches from high pressure to holding pressure when the oil pressure is within this range and the oil pressure reaches a set value, and the resin pressure in the mold is controlled by the injection oil pressure. This eliminates the need to install a pressure sensor in each mold, and when controlling the pressure inside the mold using injection hydraulic pressure, injection is performed when the screw reaches a preset position and the injection hydraulic pressure reaches the set value. By switching the hydraulic pressure from high pressure to low pressure, during high-speed injection when the mold is not filled with resin, the injection hydraulic pressure reaches the set value due to resin flow resistance and switches to low pressure. It is possible to eliminate this problem.
次に本発明を第１図に示す１実施態様例に基づ
いて具体的に説明する。第１図において１はスク
リユで、ホツパ２から供給された原料を溶融して
その先端に貯溜する。３は射出シリンダで、第１
図中の右側の室ａにポンプ４からの油が送り込ま
れ、スクリユ１を前進させて、先端に貯溜された
溶融樹脂を金型５内に射出する。７はポンプ４か
らの油の流れの方向および流量をコントロールす
る電磁比例流量弁である。８は射出油圧をコント
ロールするためにリリーフ弁と電磁比例圧力弁を
組合せたものである。９，１０は圧力センサー、
および圧力変換器で、両者の組合せで射出油圧を
電気信号に変換する。１１は圧力設定器で射出油
圧を高圧から低圧に切換える圧力を設定する。１
２は油圧の比較器で、圧力設定器１１の設定値と
圧力変換器１０からの実際の油圧とを比較して、
油圧が設定値に達すると信号をシーケンスコント
ローラ１３に送る。１６はポテンシヨメータで、
スクリユ１の位置を検出する。１４はスクリユ１
の位置を設定する設定器である。１５は位置の比
較器で、ポテンシヨメータ１６からの実際のスク
リユ１の位置と設定器１４の設定値を比較してス
クリユ１の位置が設定した位置に達すると信号を
コントロール１３に送る。シーケンスコントロー
ラ１３は比較器１２と比較器１５の両方から同時
に信号が与えられた時に、電磁比例圧力弁８に信
号を送つて油圧を高圧から低圧に切換える。 Next, the present invention will be specifically explained based on one embodiment shown in FIG. In FIG. 1, 1 is a screw, which melts the raw material supplied from the hopper 2 and stores it at its tip. 3 is the injection cylinder, the first
Oil from the pump 4 is sent into the chamber a on the right side of the figure, and the screw 1 is advanced to inject the molten resin stored at the tip into the mold 5. 7 is an electromagnetic proportional flow valve that controls the direction and flow rate of oil flow from the pump 4. 8 is a combination of a relief valve and an electromagnetic proportional pressure valve to control the injection hydraulic pressure. 9 and 10 are pressure sensors,
and a pressure transducer, the combination of which converts the injection hydraulic pressure into an electrical signal. Reference numeral 11 is a pressure setting device for setting the pressure for switching the injection hydraulic pressure from high pressure to low pressure. 1
2 is an oil pressure comparator that compares the set value of the pressure setting device 11 with the actual oil pressure from the pressure converter 10,
When the oil pressure reaches the set value, a signal is sent to the sequence controller 13. 16 is a potentiometer,
The position of the screw 1 is detected. 14 is Skrill 1
This is a setting device to set the position of. A position comparator 15 compares the actual position of the screw 1 from the potentiometer 16 with the set value of the setter 14, and sends a signal to the control 13 when the position of the screw 1 reaches the set position. When the sequence controller 13 receives signals from both the comparators 12 and 15 at the same time, it sends a signal to the electromagnetic proportional pressure valve 8 to switch the hydraulic pressure from high pressure to low pressure.
以上述べた装置の作動を説明する。 The operation of the device described above will be explained.
スクリユ１先端に貯溜された溶融樹脂を金型５
内に充填する。射出過程における射出シリンダ３
の油圧は金型５の形状、樹脂の粘度、充填速度に
より決まるが、その一例を第２図に示す。第２図
において、○イは射出油圧、○ロはスクリユ前進速度
のパターンを示す。第２図のパターンで動作した
場合を説明する。スクリユ１はまず高速で前進
し、先端の溶融樹脂を金型内に充填するにしたが
い流動抵抗が増大するので、射出油圧を増大す
る。スクリユ１が第２図のＡ点に達すると射出油
圧が設定器１１で設定した油圧Pcとなり、比較
器１２から信号がシーケンスコントローラ１３に
送られるが、スクリユ１の位置が設定器１４で設
定した位置Ｃに達していなければ比較器１５から
の信号がシーケンスコントローラ１３に送られて
いないので、シーケンスコントローラ１３から電
磁比例圧力弁８に信号が送られることはなく、電
磁比例圧力弁８の設定は高圧のままである。更に
スクリユ１が前進して図示しない位置設定器によ
りあらかじめ設定されたＢ点に達すると、図示し
ない速度コントロール装置からの信号がシーケン
スコントローラ１３に送られ、シーケンスコント
ローラ１３は電磁比例流量弁７を作動させてスク
リユ１の前進速度を低速に切換える。スクリユ１
の前進速度の減少により、金型内５の樹脂の流動
抵抗が減少し、射出油圧も減少する。更に、スク
リユ１が前進して設定器１４により設定された位
置Ｃに達すると比較器１５から信号がシーケンス
コントローラ１３に送られるが、射出油圧はまだ
設定器１１で設定された値になつていないため、
比較器１２からの信号がシーケンスコントローラ
１３に送られないので、シーケンスコントローラ
１３から電磁比例圧力弁８を作動させる信号は発
せられない。従つて圧力の設定は高圧のままであ
る。更にスクリユ１が前進し金型５内に樹脂が充
満すると、それ以後金型５内に送り込まれる樹脂
は金型５内の樹脂を圧縮することになるので、射
出油圧は急激に上昇する。Ｄ点において射出油圧
が設定器１１で設定した油圧Pcに達すると、比
較器１２からの信号がシーケンスコントローラ１
３に送られる。この時スクリユ１はすでにＤ点に
達しているので比較器１５からの信号もシーケン
スコントローラ１３に送られており、シーケンス
コントローラ１３から電磁比例圧力弁８に信号が
送られ、電磁比例圧力弁８の設定圧力が低圧Pk
に切換えられ、射出油圧もPkに切換る。これ以
後も射出シリンダ３の室ａにはPkの圧力の油が
送り込まれるのでスクリユ１は前方に押される
が、圧力が低いので金型５内の樹脂が冷却によつ
て収縮する分を補うように微低速で前進する。シ
ーケンスコントローラ１３によつてあらかじめ設
定された時間が経過すると、電磁比例流量弁７が
切換り、射出シリンダ３への油の供給が停止され
ると同時に電磁比例圧力弁８も切換り、射出シリ
ンダ３、室ａの圧力は０になり、射出の行程が終
る。Ｅ点はこの射出行程の終了点を示す。 The molten resin stored at the tip of the screw 1 is transferred to the mold 5.
Fill inside. Injection cylinder 3 in the injection process
The oil pressure is determined by the shape of the mold 5, the viscosity of the resin, and the filling speed, an example of which is shown in FIG. In Fig. 2, ○A shows the injection hydraulic pressure, and ○B shows the screw advance speed pattern. The case where the operation is performed according to the pattern shown in FIG. 2 will be explained. The screw 1 first moves forward at high speed, and as the molten resin at the tip is filled into the mold, the flow resistance increases, so the injection oil pressure is increased. When the screw 1 reaches point A in FIG. If position C has not been reached, the signal from the comparator 15 is not sent to the sequence controller 13, so no signal is sent from the sequence controller 13 to the electromagnetic proportional pressure valve 8, and the setting of the electromagnetic proportional pressure valve 8 is The pressure remains high. When the screw 1 advances further and reaches point B preset by a position setting device (not shown), a signal from a speed control device (not shown) is sent to the sequence controller 13, and the sequence controller 13 operates the electromagnetic proportional flow valve 7. Then, the forward speed of the screw 1 is changed to low speed. Skrillyu 1
Due to the reduction in the forward speed of the resin, the flow resistance of the resin in the mold 5 is reduced, and the injection oil pressure is also reduced. Further, when the screw 1 advances and reaches the position C set by the setting device 14, a signal is sent from the comparator 15 to the sequence controller 13, but the injection oil pressure has not yet reached the value set by the setting device 11. For,
Since the signal from the comparator 12 is not sent to the sequence controller 13, the sequence controller 13 does not issue a signal to operate the electromagnetic proportional pressure valve 8. Therefore, the pressure setting remains high. When the screw 1 further advances and the mold 5 is filled with resin, the resin that is subsequently fed into the mold 5 compresses the resin in the mold 5, so that the injection oil pressure increases rapidly. When the injection oil pressure reaches the oil pressure Pc set by the setting device 11 at point D, the signal from the comparator 12 is output to the sequence controller 1.
Sent to 3. At this time, since the screw 1 has already reached point D, the signal from the comparator 15 is also sent to the sequence controller 13, and the signal is sent from the sequence controller 13 to the electromagnetic proportional pressure valve 8. Set pressure is low pressure Pk
The injection hydraulic pressure is also switched to Pk. After this, oil with a pressure of Pk is fed into the chamber a of the injection cylinder 3, so the screw 1 is pushed forward, but since the pressure is low, the resin in the mold 5 has to compensate for the shrinkage due to cooling. Move forward at very low speed. When the time set in advance by the sequence controller 13 has elapsed, the electromagnetic proportional flow valve 7 switches to stop the supply of oil to the injection cylinder 3. At the same time, the electromagnetic proportional pressure valve 8 also switches to stop the supply of oil to the injection cylinder 3. , the pressure in chamber a becomes 0, and the injection process ends. Point E indicates the end point of this injection stroke.
従つて、この装置によれば、射出油圧により金
型５内の樹脂圧力をコントロールするので、金型
５毎に圧力センサーを取付る必要がなくなり、射
出油圧により金型５内の圧力をコントロールする
時に、スクリユ１があらかじめ設定した位置に到
達し、なおかつ射出油圧が設定値に達した時に射
出油圧を高圧から低圧に切換えるようにしたこと
により、金型５内に樹脂が充満していない状態で
の高速射出時に樹脂の流動抵抗によつて射出油圧
が設定値に達して低圧に切換わるという不具合を
解消することができる。 Therefore, according to this device, since the resin pressure in the mold 5 is controlled by the injection hydraulic pressure, there is no need to install a pressure sensor for each mold 5, and the pressure in the mold 5 is controlled by the injection hydraulic pressure. By switching the injection hydraulic pressure from high pressure to low pressure when the screw 1 reaches a preset position and the injection hydraulic pressure reaches the set value, the injection pressure can be changed from high pressure to low pressure. It is possible to eliminate the problem of the injection oil pressure reaching a set value and switching to a low pressure due to flow resistance of the resin during high-speed injection.
以上本発明を第１図に示す１実施態様例に基づ
いて具体的に説明したが、本発明はこの例だけに
限定されるものではない。 Although the present invention has been specifically described above based on one embodiment shown in FIG. 1, the present invention is not limited to this example.
第１図は本発明を実施する１態様例を示す図で
あり、第２図は第１図に示した装置のスクリユ位
置、射出油圧とスクリユ前進速度の関係を示すグ
ラフである。
１……スクリユ、２……ホツパ、３……射出シ
リンダ、４……ポンプ、５……金型、７……電磁
比例流量弁、８……電磁比例圧力弁、９……圧力
センサー、１０……圧力変換器、１１……圧力設
定器、１２……油圧の比較器、１３……シーケン
スコントローラ、１４……設定器、１５……位置
の比較器、１６……ポテンシヨメータ、ａ……
室。
FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is a graph showing the relationship between the screw position, injection oil pressure, and screw forward speed of the apparatus shown in FIG. 1. 1... Screw, 2... Hopper, 3... Injection cylinder, 4... Pump, 5... Mold, 7... Electromagnetic proportional flow valve, 8... Electromagnetic proportional pressure valve, 9... Pressure sensor, 10 ... Pressure transducer, 11 ... Pressure setting device, 12 ... Hydraulic pressure comparator, 13 ... Sequence controller, 14 ... Setting device, 15 ... Position comparator, 16 ... Potentiometer, a ... …
Room.
Claims (1)
比例流量弁と、同流量弁と並設した射出油圧をコ
ントロールする電磁比例圧力弁と、スクリユの位
置を検出する検出器と、スクリユの位置設定器
と、同位置設定器及び該検出器の両出力信号を受
けスクリユの位置が設定位置に達すると信号を発
する位置の比較器と、上記射出シリンダに臨んで
設けた圧力センサーと、射出油圧の切換え圧力を
設定する圧力設定器と、同圧力設定器と圧力セン
サーからの両出力信号を受け射出油圧が設定値に
達すると信号を発する油圧の比較器と、該両比較
器の信号を受け上記電磁比例圧力弁に信号を出力
するシーケンスコントローラとを有しておること
を特徴とする射出成形機。1. An electromagnetic proportional flow valve that controls the flow rate of the injection cylinder, an electromagnetic proportional pressure valve that controls the injection hydraulic pressure installed in parallel with the flow valve, a detector that detects the position of the screw, and a screw position setting device. A comparator located at a position that receives output signals from both the position setting device and the detector and emits a signal when the screw position reaches the set position, a pressure sensor provided facing the injection cylinder, and setting the switching pressure of the injection hydraulic pressure. a pressure setting device that receives both output signals from the pressure setting device and the pressure sensor, and a hydraulic pressure comparator that issues a signal when the injection hydraulic pressure reaches a set value; An injection molding machine characterized by having a sequence controller that outputs a signal to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17869687A JPH0270417A (en) | 1987-07-17 | 1987-07-17 | Injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17869687A JPH0270417A (en) | 1987-07-17 | 1987-07-17 | Injection molding machine |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12092476A Division JPS5346360A (en) | 1976-10-08 | 1976-10-08 | Method of controlling injection pressure of injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0270417A JPH0270417A (en) | 1990-03-09 |
| JPH0367854B2 true JPH0367854B2 (en) | 1991-10-24 |
Family
ID=16052953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17869687A Granted JPH0270417A (en) | 1987-07-17 | 1987-07-17 | Injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0270417A (en) |
-
1987
- 1987-07-17 JP JP17869687A patent/JPH0270417A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0270417A (en) | 1990-03-09 |
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