JPH0270417A - Injection molding machine - Google Patents
Injection molding machineInfo
- Publication number
- JPH0270417A JPH0270417A JP17869687A JP17869687A JPH0270417A JP H0270417 A JPH0270417 A JP H0270417A JP 17869687 A JP17869687 A JP 17869687A JP 17869687 A JP17869687 A JP 17869687A JP H0270417 A JPH0270417 A JP H0270417A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- injection
- mold
- hydraulic pressure
- 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
- 238000001746 injection moulding Methods 0.000 title claims description 6
- 238000002347 injection Methods 0.000 claims abstract description 55
- 239000007924 injection Substances 0.000 claims abstract description 55
- 239000011347 resin Substances 0.000 abstract description 29
- 229920005989 resin Polymers 0.000 abstract description 29
- 238000000034 method Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002002 slurry 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)
Abstract
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の
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、金型内に
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
によっ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た圧力に達す
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。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. In this method, a pressure sensor is inserted into 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, there is a method of detecting the injection oil pressure and switching the injection oil pressure from high pressure to low pressure when this pressure reaches a preset pressure, but in this case.
金型内に溶融樹脂を高速で充填する過程で、金型内の樹
脂の流動抵抗によっ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。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 (second
Point A in the figure) Since the injection hydraulic pressure switches 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、スクリュス
トロークの範囲を設定できるようにしスクリュストロー
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
御しつる射出成形機に係り、射出油圧によυ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υ金型内の圧
力をコントロールする時て、スクリュがあらかじめ設定
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。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. The screw stroke range can be set to prevent the injection oil pressure from switching from high pressure to low pressure even if the injection oil pressure reaches the set value while filling the mold with molten resin at high speed. Controls the injection pressure so that it switches from high pressure to holding pressure when the oil pressure reaches a set value.Related to an injection molding machine, the resin pressure inside the υ 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, it is possible to ensure that the screw reaches the preset position and the injection hydraulic pressure reaches the set value. By changing the injection hydraulic pressure from high pressure to low pressure when
金型内に樹脂が充満していない状態での高速射出時に樹
脂の流動抵抗によっ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。This eliminates the problem that during high-speed injection when the mold is not filled with resin, the injection oil pressure reaches a set value and switches to a low pressure due to resin flow resistance.
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はスクリュで、ホッパ
２から供給された原料を溶融してその先端に貯溜する。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 a hopper 2 and stores it at its tip.
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、スクリュ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。3 is an injection cylinder, and a pump 4 is installed in chamber a on the right side in Fig. 1.
The oil from the screw 1 is sent forward, and the molten resin stored at the tip is injected into the mold 5 by moving the screw 1 forward.
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９両者の組合せで射出油圧を電気信号に変換す
る。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 a pressure sensor and a pressure transducer, and the combination of these two converts the injection hydraulic pressure into an electrical signal.
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。１２は油圧の比較器で、圧力設定器１
１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はポテンショメータで、スクリ
１１の位置を検出する。１４はスクリュ１の位置を設定
する設定器である。１５は位置の比較器で、ポテンショ
メータ１６からの実際のスクリュ１の位置と設定器１４
の設定値を比較してスクリュ１の位置が設定した位置に
達すると信号をコントローラ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１５０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
送って油圧を高圧から低圧に切換える。Reference numeral 11 is a pressure setting device for setting the pressure for switching the injection hydraulic pressure from high pressure to low pressure. 12 is a hydraulic pressure comparator, and pressure setting device 1
1 and the actual oil pressure from the pressure transducer 10, and when the oil pressure reaches the set value, a signal is sent to the sequence controller 13. A potentiometer 16 detects the position of the screen 11. 14 is a setting device for setting the position of the screw 1. 15 is a position comparator, which compares the actual position of the screw 1 from the potentiometer 16 with the setting device 14.
When the position of the screw 1 reaches the set position, a signal is sent to the controller 13. When the sequence controller 13 receives signals from both the comparator 12 and the comparator 150 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.
スラリー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−
例を第２図に示す。The mold 5 is filled with the molten resin stored at the tip of the slurry 1. The hydraulic pressure of the injection cylinder 3 during the injection process is controlled by the mold 5.
It is determined by the shape of the resin, the viscosity of the resin, and the filling speed.
An example is shown in FIG.
第２図において、■は射出油圧、ＯはスフＩＪ。In Fig. 2, ■ is the injection oil pressure, and O is the Sufu IJ.
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。スクリュ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、射出油圧も増大する。スクリュ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、スクリュ１の位置が設定器１
４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。更にスクリュ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１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ュ
１の前進速度を低速に切換える。スクリュ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、スクリュ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っていないた
め、比較器１２からの信号がシーケンスコントローラ１
３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
って圧力の設定は高圧の−１まである。更にスクリュ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１３に
送られる。Shows the pattern of forward speed. 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 mold is filled with molten resin at the tip, the flow resistance increases, and therefore the injection oil pressure also increases. Screw 1 is the second
When reaching point A in the figure, the injection oil pressure becomes the oil pressure Pc set by the setting device 11, and a signal is sent from the comparator 12 to the sequence controller 13.
If the position C set in step 4 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 electromagnetic proportional pressure valve Setting 8 remains at high pressure. When the screw 1 further advances and reaches point B, which is 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. By reducing the forward speed of the screw 1, 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 moves forward 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. Therefore, the signal from the comparator 12 is sent to the sequence controller 1.
3, the sequence controller 13 does not issue a signal to operate the electromagnetic proportional pressure valve 8. Therefore, the pressure settings range from high pressure to -1. Furthermore, screw 1
When the mold 5 advances and the resin fills the mold 5, the mold 5
Since the resin fed into the mold 5 compresses the resin inside the mold 5, 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,
A signal from comparator 12 is sent to sequence controller 13.
この時スクリュ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。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 sequence controller 13 sends a signal to the electromagnetic proportional pressure valve 8.
電磁比例圧力弁８の設定圧力が低圧Ｐｋに切換えられ、
射出油圧も株に切換る。これ以後も射出シリンダ３の室
ａにはへの圧力の油が送り込まれるのでスクリュ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
によっ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によっ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９．射出シリンダ３．室ａの圧力はＯ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 set pressure of the electromagnetic proportional pressure valve 8 is switched to low pressure Pk,
Injection hydraulic pressure is also switched to stock. After this, oil at a pressure of 1 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 is slightly pumped to compensate for the shrinkage caused by cooling. Move forward at low speed. When the time set in advance by the sequence controller 13 has elapsed, the electromagnetic proportional flow valve 7 is switched, and the supply of oil to the injection cylinder 3 is stopped, and at the same time, the electromagnetic proportional pressure valve 8 is also switched 9. Injection cylinder 3. The pressure in chamber a becomes O, and the injection process ends. Point E indicates the end point of this injection stroke.
従って、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。Therefore, according to this device, the resin pressure within the mold 5 is controlled by the injection hydraulic pressure.
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
クリュ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
っ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。It is no longer necessary to install a pressure sensor in each mold 5, and when the pressure inside the mold 5 is controlled by injection hydraulic pressure, injection is performed when the screw 1 reaches a preset position and the injection hydraulic pressure reaches the set value. By switching the oil pressure from high pressure to low pressure, we have solved the problem that during high-speed injection when the mold 5 is not filled with resin, the injection oil pressure reaches the set value due to resin flow resistance and switches to low pressure. It can be resolved.
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１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ュ位置、射出油圧と
スクリュ前進速度の関係を示すグラフである。
１・・・スクリュ、２・・・ホッパ、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・・
・ポテンショメータ、ａ・・・室。
図面の浄ａ
手
続
補
正
書（方式）
昭和６３年に月３７日
１、事件の表示
昭和６２年
特
許
願第
号
２、発明の名称
射出成形機
補正をする者
事件との関係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 device shown in FIG. 1. 1...screw, 2...hopper, 3...injection cylinder. 4... Pump, 5... Mold, 7... Solenoid proportional flow valve. 8... Solenoid proportional pressure valve, 9... Pressure sensor 10.
...Pressure converter, 11...Pressure setting device, 12...Hydraulic pressure comparator, 13...Sequence controller. 14... Setting device, 15... Position comparator, 16...
・Potentiometer, a...chamber. Purification of drawings a Procedural amendment (method) Date of May 37, 1988 1, Indication of the case 1988 Patent Application No. 2, Relationship with the case of the person who amends the name of the invention Injection molding machine
Claims (1)
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、スクリュの位置を検出する検出器と、
スクリュの位置設定器と、同位置設定器及び該検出器の
両出力信号を受けスクリュ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。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, and a detector that detects the position of the screw.
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 a set position, and a pressure sensor provided facing the injection cylinder. , a pressure setting device that sets the switching pressure of the injection hydraulic pressure, a hydraulic pressure comparator that receives both output signals from the pressure setting device and the pressure sensor, and emits a signal when the injection hydraulic pressure reaches a set value, and An injection molding machine comprising: a sequence controller that receives a signal and outputs a signal to the electromagnetic proportional pressure valve.
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 true JPH0270417A (en) | 1990-03-09 |
| JPH0367854B2 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 |
|---|---|
| JPH0367854B2 (en) | 1991-10-24 |
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