JPH01114410A - Method for controlling back pressure of injection molder - Google Patents
Method for controlling back pressure of injection molderInfo
- Publication number
- JPH01114410A JPH01114410A JP27266087A JP27266087A JPH01114410A JP H01114410 A JPH01114410 A JP H01114410A JP 27266087 A JP27266087 A JP 27266087A JP 27266087 A JP27266087 A JP 27266087A JP H01114410 A JPH01114410 A JP H01114410A
- Authority
- JP
- Japan
- Prior art keywords
- back pressure
- nozzle
- mold
- contact
- cylinder
- 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 19
- 238000002347 injection Methods 0.000 title abstract description 6
- 239000007924 injection Substances 0.000 title abstract description 6
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 238000001746 injection moulding Methods 0.000 claims description 9
- 239000011347 resin Substances 0.000 abstract description 12
- 229920005989 resin Polymers 0.000 abstract description 12
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 230000000630 rising effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
く産業上の利用分野〉
本発明は，射出成形機の背圧制御に係シ，特に成形運転
の開始に際し，ノズルが金型に接してない時における最
初の計量工程の背圧制御方法に関する。[Detailed description of the invention] Industrial application field> The present invention relates to back pressure control of an injection molding machine, and in particular, to the control of back pressure in an injection molding machine, and in particular to the control of the first metering process when the nozzle is not in contact with the mold at the start of a molding operation. This invention relates to a back pressure control method.
く従来の技術〉
計量工程について説明すると，充填，保圧から成る射出
工程が了ると，火成形サイクルの充填に備え，ノズルを
金型に接触させた状態でスクリュを前進限位置で回転さ
せ，スクリュ元部から供給された樹脂材料を加熱部から
の加熱により溶融混練しながらスクリュ元部から先端方
向に移送し。To explain the metering process, once the injection process consisting of filling and holding pressure is completed, the screw is rotated at the forward limit position with the nozzle in contact with the mold in preparation for filling in the fire forming cycle. The resin material supplied from the screw base is melted and kneaded by heating from the heating section and transferred from the screw base toward the tip.
スクリュ先端部にあるバレルの空隙部へ蓄積し。It accumulates in the cavity of the barrel at the tip of the screw.
一定量の溶融樹脂をスクリュの前方へ計量する工程であ
る。この際スクリユは樹脂材料を前方へ送ると同時に、
スクリユ前方に蓄積された樹脂材料の圧力により予め定
められた後退限まで後退する。This is the process of metering a certain amount of molten resin to the front of the screw. At this time, the screw sends the resin material forward and at the same time
The screw is retracted to a predetermined retraction limit due to the pressure of the resin material accumulated in front of the screw.
このスクリュの後退に際し、樹脂材料の練シを良くシ、
均一化した成形品となるようにスクリュの後端から絶え
づ圧力背荷している。When retracting this screw, thoroughly knead the resin material.
Pressure is constantly applied from the rear end of the screw to ensure a uniform molded product.
スクリユの後退が了り、計量が了ると、型開きのために
ノズルは金型から離れ、計量された樹脂材料が開いたノ
ズル孔から流れ出る（鼻たれ現象という）のを防ぐため
、後退位置にあるスクリユを少し、後退させ（サックバ
ックという）負圧とし計量された樹脂材料の圧力を抜く
ようにしている。When the screw has retreated and the measurement has been completed, the nozzle is moved away from the mold to open the mold, and the nozzle is moved to the retracted position to prevent the measured resin material from flowing out from the open nozzle hole (referred to as the dripping phenomenon). The screw is moved back a little (called suckback) to create a negative pressure and release the pressure of the weighed resin material.
く問題を解決しようとする問題点〉
前述のように成形運転に入ってしまえば、計量時はノズ
ルが金型に接した状態で行われるため。Problems that we are trying to solve> As mentioned above, once the molding operation begins, the nozzle is in contact with the mold during metering.
問題はないが、成形運転に際し、一番最初の計量を行う
際には、ノズル孔は塞がってなく、計量の為にスクリュ
を回転させると、溶融樹脂はスクリユの前方の空隙部へ
計量されず、ノズル孔よシ出てしまい、スクリュは後退
が出来ない、これは背圧が高いために起きる現象である
。There is no problem, but when performing the first metering during molding operation, the nozzle hole was not blocked, and when the screw was rotated for metering, the molten resin was not metered into the gap in front of the screw. , the screw protrudes from the nozzle hole and cannot be retracted. This is a phenomenon caused by high back pressure.
本発明の目的は前述のような欠点を取除き、成形運転に
際し立上シ時の最初の計量も上手く出来るようにした背
圧制御方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a backpressure control method that eliminates the above-mentioned drawbacks and allows for efficient initial metering during start-up during a molding operation.
く問題を解決するための手段〉
前述の目的を達成するため、射出成形機の背圧制御方法
において、成形運転の立上りに際し、−番最初の計量工
程をノズルが金型に接しているか否を判断し、ノズルが
金型に接してないと判断されたとき、計量開始信号によ
り、背圧を０設定。In order to achieve the above-mentioned purpose, in a back pressure control method for an injection molding machine, at the start of a molding operation, the first metering process is performed by checking whether or not the nozzle is in contact with the mold. When it is determined that the nozzle is not in contact with the mold, the back pressure is set to 0 by the measurement start signal.
或いは背圧を抜くための回路を構成することを特徴とす
る射出成形機の計量工程制御方法とした。Alternatively, there is provided a metering process control method for an injection molding machine, characterized by configuring a circuit for releasing back pressure.
く作 用〉
成形運転に際し、立上り時の最初の計量において、ノズ
ルが金型に接していない場合、背圧が負荷されてい表い
。〉 During molding operation, if the nozzle is not in contact with the mold during the initial measurement at startup, back pressure is being applied.
〈実施例〉
次に本発明の１実施例を第１図および第２図により説明
する。１１は固定金型で固定板１２に取付られておシ、
型締時には図示してない移動板に取付られた移動金型と
尚接し、キャビティを形成するようになっている。１３
け加熱シリンダで先端に溶融樹脂射出用のノズル１４が
取付である。１５は加熱シリンダ１３の内径部に挿着さ
れたスクリュで、軸方向に射出シリンダ１６に作用する
圧油により所定距離だけ進退するとともに、油圧モータ
１７により回転可能となっている。従ってホッパ１８か
ら供給された樹脂材料はスクリＳ１５の回転により図示
してない加熱シリンダ１３に設けた加熱装置により加熱
されながら溶融し、スクリュ１５の前方に蓄積されるよ
うになっている。１９は固定板１２と加熱シリンダ１３
０間に設けたノズルタッチシリンダで、前記計量された
溶融樹脂をキャビティ内に充填するに際し、ノズル１４
を固定金型】１の金型ゲー） １１ａに接するようにす
るとともに、キャビティ内に形成された製品を取出すた
めの型開きの際には、金型ゲートｌｌａから離すように
するものである。２０は電磁切換弁で前記ノズルタッチ
シリンダ１９の切換制御を行うものである。２１は射出
シリンダ１６を制御する電磁切換弁である。２２は背圧
を設定する電磁比例式ＩＪ ＩＪ−フ弁で、設定した電
圧に比例した背圧を負荷するようになりでいる。従りて
背圧０を設定すれば、それに見合った所定の電圧を設定
すれば良い。２３は背圧切換用の電磁弁で励磁されると
、背圧は抜けるような回路となっている。<Example> Next, an example of the present invention will be described with reference to FIGS. 1 and 2. 11 is a fixed mold that is attached to the fixed plate 12;
When the mold is clamped, it still comes into contact with a movable mold attached to a movable plate (not shown) to form a cavity. 13
A nozzle 14 for injecting molten resin is attached to the tip of the heating cylinder. Reference numeral 15 denotes a screw inserted into the inner diameter portion of the heating cylinder 13, which is moved forward and backward by a predetermined distance by pressure oil acting on the injection cylinder 16 in the axial direction, and is rotatable by a hydraulic motor 17. Therefore, the resin material supplied from the hopper 18 is melted while being heated by the heating device provided in the heating cylinder 13 (not shown) as the screw S15 rotates, and is accumulated in front of the screw 15. 19 is a fixed plate 12 and a heating cylinder 13
When filling the measured molten resin into the cavity with the nozzle touch cylinder provided between the nozzle 14
The fixed mold 11a) is placed in contact with the mold gate 11a, and is separated from the mold gate lla when the mold is opened to take out the product formed in the cavity. Reference numeral 20 denotes an electromagnetic switching valve for controlling switching of the nozzle touch cylinder 19. 21 is an electromagnetic switching valve that controls the injection cylinder 16. Reference numeral 22 is an electromagnetic proportional type IJ valve for setting back pressure, which loads back pressure proportional to the set voltage. Therefore, if the back pressure is set to 0, a predetermined voltage commensurate with the back pressure may be set. Reference numeral 23 is a circuit in which back pressure is released when excited by a solenoid valve for switching back pressure.
２４はリミットスイッチで、ノズル１４が金型１４に接
したか否かを判断するためのもので、第２図のように示
すように、ノズルタッチしてない時の信号Ｓ、と計量開
始信号Ｓが発しられたとき信号Ａが発せられるようにな
っており、前記信号Ａは前記背圧切換用の電磁弁２３の
励磁信号であっても良いし。24 is a limit switch, which is used to judge whether or not the nozzle 14 has touched the mold 14, and as shown in Fig. 2, there is a signal S when the nozzle is not touched, and a measurement start signal. A signal A is emitted when S is emitted, and the signal A may be an excitation signal for the solenoid valve 23 for switching back pressure.
また背圧設定用電磁比例式リリーフ弁２２の０出力信号
であっても良い。Alternatively, it may be a 0 output signal of the electromagnetic proportional relief valve 22 for setting back pressure.
また前記信号Ｓｏは、リミットスイッチ２４の信号に限
らず、仮想線“イ”、′口”で囲ったノズル１４のノズ
ルタッチ位置を検出する位置スイッチ、或いはノズルタ
ッチシリンダ１９の圧力を検出する圧力スイッチの信号
でも良い。Further, the signal So is not limited to the signal of the limit switch 24, but also the position switch that detects the nozzle touch position of the nozzle 14 surrounded by the virtual lines "A" and "'口", or the pressure that detects the pressure of the nozzle touch cylinder 19. It can also be a switch signal.
〈発明の効果〉 前述のようにノズルが金型に接していない時は。<Effect of the invention> As mentioned above, when the nozzle is not in contact with the mold.
背圧はＯか又は背圧が抜けるようになっているので、計
量時に背圧が負荷されないので、轟初に掲げたような欠
点は取除かれる。Since the back pressure is set to O or is released, no back pressure is applied during measurement, so the drawbacks mentioned in Todoroki Hajime are eliminated.
第１図は本発明による１実施例を示す図。第２図は制御
用のロジック回路図。
１１・・・固定金型、１３・・・スクリユ、１４・・・
ノズル、１９・・・ノズルタッチシリンダ、２０・・・
電磁切換弁（ノズルタッチシリンダ用）、２１・・・電
磁切換弁（射出シリンダ用）、２２・・・電磁比例式リ
リーフ弁、２３・・・電磁切換弁（背圧切換用）FIG. 1 is a diagram showing one embodiment according to the present invention. Figure 2 is a control logic circuit diagram. 11... Fixed mold, 13... Screw, 14...
Nozzle, 19... Nozzle touch cylinder, 20...
Solenoid switching valve (for nozzle touch cylinder), 21... Solenoid switching valve (for injection cylinder), 22... Solenoid proportional relief valve, 23... Solenoid switching valve (for back pressure switching)
Claims (1)
上りに際し、一番最初の計量工程をノズルが金型に接し
ているか否かを判断し、ノズルが金型に接していないと
判断されたとき、計量開始信号により背圧を０設定、或
いは背圧を抜くための回路を構成することを特徴とする
射出成形機の計量工程制御方法。 ２）前記ノズルが金型に接しているか否かの判断は、リ
ミットスイッチにより行うことを特徴とする前記特許請
求の範囲第１項記載の射出成形機の背圧制御方法。 ３）前記ノズルが金型に接しているか否かの判断は、ノ
ズルの前進位置を検出する位置スケールにより行うこと
を特徴とする前記特許請求の範囲第１項記載の射出成形
機の背圧制御方法。 ４）前記ノズルが金型に接しているか否かの判断は、ノ
ズルの進退を制御するノズルタッチシリンダにおける圧
力を検知する圧力スイッチにより行うことを特徴とする
前記特許請求の範囲第１項記載の射出成形機の背圧制御
方法。[Claims] 1) In a back pressure control method for an injection molding machine, at the start of a molding operation, the first metering process is performed by determining whether or not the nozzle is in contact with the mold, and determining whether or not the nozzle is in contact with the mold. A method for controlling a metering process for an injection molding machine, characterized in that when it is determined that there is no contact, a circuit is configured to set back pressure to 0 or release the back pressure in response to a metering start signal. 2) The back pressure control method for an injection molding machine according to claim 1, wherein the determination as to whether or not the nozzle is in contact with the mold is made by a limit switch. 3) Back pressure control for an injection molding machine according to claim 1, wherein the determination as to whether or not the nozzle is in contact with the mold is made using a position scale that detects the forward position of the nozzle. Method. 4) The method according to claim 1, wherein the determination as to whether or not the nozzle is in contact with the mold is made by a pressure switch that detects the pressure in a nozzle touch cylinder that controls the advance and retreat of the nozzle. Back pressure control method for injection molding machines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27266087A JPH01114410A (en) | 1987-10-28 | 1987-10-28 | Method for controlling back pressure of injection molder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27266087A JPH01114410A (en) | 1987-10-28 | 1987-10-28 | Method for controlling back pressure of injection molder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01114410A true JPH01114410A (en) | 1989-05-08 |
| JPH0443774B2 JPH0443774B2 (en) | 1992-07-17 |
Family
ID=17517016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27266087A Granted JPH01114410A (en) | 1987-10-28 | 1987-10-28 | Method for controlling back pressure of injection molder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01114410A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012171107A (en) * | 2011-02-17 | 2012-09-10 | Fanuc Ltd | Injection molding machine provided with nozzle sealing plate and molding operation start method of injection molding machine |
-
1987
- 1987-10-28 JP JP27266087A patent/JPH01114410A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012171107A (en) * | 2011-02-17 | 2012-09-10 | Fanuc Ltd | Injection molding machine provided with nozzle sealing plate and molding operation start method of injection molding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0443774B2 (en) | 1992-07-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |