JP5351307B1 - Pressure control device for injection molding machine - Google Patents

Pressure control device for injection molding machine Download PDF

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JP5351307B1
JP5351307B1 JP2012131957A JP2012131957A JP5351307B1 JP 5351307 B1 JP5351307 B1 JP 5351307B1 JP 2012131957 A JP2012131957 A JP 2012131957A JP 2012131957 A JP2012131957 A JP 2012131957A JP 5351307 B1 JP5351307 B1 JP 5351307B1
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pressure
screw
injection
resin
pressure control
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JP2013256019A (en
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淳平 丸山
辰宏 内山
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ファナック株式会社
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating
    • B29C45/77Measuring, controlling or regulating of velocity or pressure of moulding material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76003Measured parameter
    • B29C2945/76006Pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76003Measured parameter
    • B29C2945/76013Force
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76177Location of measurement
    • B29C2945/7618Injection unit
    • B29C2945/76187Injection unit screw
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76177Location of measurement
    • B29C2945/7618Injection unit
    • B29C2945/7619Injection unit barrel
    • B29C2945/76193Injection unit barrel barrel-chamber
    • B29C2945/76197Injection unit barrel barrel-chamber screw ante-chamber
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76177Location of measurement
    • B29C2945/7618Injection unit
    • B29C2945/7621Injection unit nozzle
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76177Location of measurement
    • B29C2945/7618Injection unit
    • B29C2945/76214Injection unit drive means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76344Phase or stage of measurement
    • B29C2945/76381Injection
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76344Phase or stage of measurement
    • B29C2945/76384Holding, dwelling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76494Controlled parameter
    • B29C2945/76498Pressure

Abstract

【課題】予備射出工程では樹脂の抵抗による誤差を排除した正確な圧力検出を行うことで高精度な計量を行うことが可能な射出成形機の圧力制御装置を提供すること。
【解決手段】射出工程を実行し(SA01)、保圧工程を、ロードセル検出値に基づいて圧力制御により保圧工程を実行し(SA02)、計量工程を実行し(SA03)、ノズル圧センサー検出値に基づいて圧力制御により予備射出工程を実行し(SA04)、サイクルが終了するまで処理を継続する(SA05)。
【選択図】図3
An object of the present invention is to provide a pressure control device for an injection molding machine capable of performing high-accuracy weighing by performing accurate pressure detection that eliminates an error due to resin resistance in a preliminary injection process.
An injection process is executed (SA01), a pressure holding process is executed by pressure control based on a load cell detection value (SA02), a metering process is executed (SA03), and a nozzle pressure sensor is detected. Based on the value, the preliminary injection process is executed by pressure control (SA04), and the process is continued until the cycle is completed (SA05).
[Selection] Figure 3

Description

本発明は、射出成形機の圧力制御装置に関する。   The present invention relates to a pressure control device for an injection molding machine.
インラインスクリュ式射出成形機では、加熱シリンダ内のスクリュを回転させ樹脂材料を溶融混練し、加熱シリンダの先端部に溶融樹脂を圧送し、これに伴って圧力制御を行いながらスクリュを後退させて、スクリュが設定計量点に到達すると、スクリュの回転を止め、かつスクリュの後退も停止させて樹脂の計量を行っている。そして、この計量後にスクリュを前進させて金型内に溶融樹脂を充填する射出工程と保圧工程を行う。保圧工程では樹脂圧力が所定値となるように圧力制御を行うことによって、成形品の収縮にともなうヒケを補填する。   In an in-line screw type injection molding machine, the screw in the heating cylinder is rotated to melt and knead the resin material, the molten resin is pumped to the tip of the heating cylinder, and the screw is moved backward while performing pressure control. When the screw reaches the set measurement point, the screw is stopped and the backward movement of the screw is stopped to measure the resin. Then, after this measurement, an injection process and a pressure holding process are performed in which the screw is advanced to fill the mold with the molten resin. In the pressure-holding step, pressure control is performed so that the resin pressure becomes a predetermined value, thereby compensating for sink marks due to shrinkage of the molded product.
成形品の品質を安定させるには、成形サイクル毎に金型内に充填される溶融樹脂の充填量のバラツキを少なくする必要がある。スクリュが計量完了位置まで後退し、その後、射出を行うとき、計量した溶融樹脂が毎成形サイクル決まった量だけ金型内に充填されれば、成形品の重量のバラツキはなく、成形品の品質を均一に保つことができる。しかし、計量完了から射出開始時までの間に、溶融樹脂がシリンダの先端部から後方に逆流し、シリンダ先端部の計量樹脂量が変化して樹脂密度が変化すると、射出工程でのスクリュの前進量が毎成形サイクル同じであっても、毎サイクル溶融樹脂量がバラツクという問題がある。   In order to stabilize the quality of the molded product, it is necessary to reduce variations in the filling amount of the molten resin filled in the mold for each molding cycle. When the screw moves back to the weighing completion position and then injects, if the measured amount of molten resin is filled into the mold by the amount determined for each molding cycle, there will be no variation in the weight of the molded product, and the quality of the molded product. Can be kept uniform. However, when the molten resin flows backward from the tip of the cylinder to the rear from the completion of metering to the start of injection, the amount of metering resin at the cylinder tip changes and the resin density changes, the screw advances during the injection process. Even if the amount is the same every molding cycle, there is a problem that the amount of molten resin varies every cycle.
計量工程時には、スクリュの回転に伴って発生した溶融樹脂をシリンダ先端部に供給し、射出工程時には、シリンダ先端部の溶融樹脂が後方に逆流せず、金型内に射出されるようにするために、スクリュの先端には、逆流防止弁、チェックリング等の弁が設けられている。そして、この弁を介して計量完了から射出開始時において、溶融樹脂がスクリュ先端部と後端部間で移動して計量樹脂量が変化することを防止し、正確に計量樹脂量を射出するように構成されている。しかし、この溶融樹脂の逆流を防止する弁などの逆流防止手段の動作遅れに伴って溶融樹脂が逆流し、正確な溶融樹脂量を射出できないという問題がある。この点を改善するための技術が各種提案されている。   In the metering process, the molten resin generated with the rotation of the screw is supplied to the cylinder tip, and in the injection process, the molten resin at the cylinder tip does not flow backward and is injected into the mold. In addition, a valve such as a backflow prevention valve and a check ring is provided at the tip of the screw. Through this valve, when the injection is started after the completion of the measurement, the molten resin is prevented from moving between the screw front end portion and the rear end portion to change the amount of the measured resin, so that the measured resin amount is accurately injected. It is configured. However, there is a problem in that the molten resin flows backward with a delay in the operation of the backflow preventing means such as a valve for preventing the molten resin from flowing back, and an accurate amount of the molten resin cannot be injected. Various techniques for improving this point have been proposed.
例えば特許文献1では、溶融樹脂を可塑化計量した後、射出シリンダの圧力室にキャビティへの前記溶融樹脂の注入圧力より低い圧力を一定時間或いは前記圧力が一定圧力まで上昇する間を維持して予備射出を行うとともに、予備射出時にスクリュを可塑化計量時とは反対方向に回転させ、逆流防止弁の前後に樹脂圧力による差圧を作り前記逆流防止弁を後退させる技術が開示されている。
特許文献2では、計量主処理工程の終了後、前記スクリュを回転自由状態にして前進移動させるとともに、この前進移動時における前記スクリュの回転状態を監視し、前記スクリュの回転が停止状態になったなら前記スクリュを所定の回転量だけ逆回転させる計量後処理工程の技術が開示されている。
For example, in Patent Document 1, after plasticizing and measuring a molten resin, a pressure lower than the injection pressure of the molten resin into the cavity is maintained for a certain period of time or while the pressure rises to a certain pressure in the pressure chamber of the injection cylinder. A technique is disclosed in which a preliminary injection is performed and a screw is rotated in a direction opposite to that during plasticization measurement during the preliminary injection to create a differential pressure due to a resin pressure before and after the backflow prevention valve to retract the backflow prevention valve.
In Patent Document 2, after the measurement main processing step is finished, the screw is moved forward in a rotational free state, the rotational state of the screw during the forward movement is monitored, and the rotation of the screw is stopped. Then, a technique of a post-weighing process that reversely rotates the screw by a predetermined rotation amount is disclosed.
特許文献3では、設定された計量完了位置に達するとスクリュの回転を停止し、射出サーボモータを駆動してスクリュを前進させることで前記背圧P1よりも高い圧力P2を作用させて逆流防止弁を閉鎖し、その後圧力P2を作用させたまま回転サーボモータを駆動してスクリュを一定量逆転させてシリンダ内の溶融樹脂の圧力p1を0または限りなく0に近いp2まで除圧する技術が開示されている。
特許文献4では、スクリュ又はプランジャが計量完了してスクリュ又はプランジャを射出方向とは反対方向に後退させる後退工程の後かつ射出工程の前に、所定の速度で、所定の圧力に達するまで、又は所定の位置に到達するまで、又は所定の時間だけ、射出方向にスクリュ又はプランジャを前進させ、その後スクリュを計量工程とは逆方向に所定の速度で回転させる技術が開示されている。
In Patent Document 3, when the set measurement completion position is reached, the rotation of the screw is stopped, the injection servo motor is driven to advance the screw, and a pressure P2 higher than the back pressure P1 is applied to act as a backflow prevention valve. Is closed, and then the rotary servo motor is driven while the pressure P2 is applied to reverse the screw by a certain amount so that the pressure p1 of the molten resin in the cylinder is reduced to 0 or p2 close to 0 as much as possible. ing.
In Patent Document 4, after the screw or plunger is completely metered and after the retreating process in which the screw or plunger is retracted in the direction opposite to the injection direction and before the injection process, until a predetermined pressure is reached at a predetermined speed, or A technique is disclosed in which a screw or plunger is advanced in the injection direction until a predetermined position is reached or for a predetermined time, and then the screw is rotated at a predetermined speed in a direction opposite to the metering step.
また、ノズル内樹脂圧を検出してフィードバック制御を行う技術が各種提案されている。
特許文献5では、射出工程中は射出速度のフィードバック制御を行い、射出工程から保圧工程への移行時に、ノズル内樹脂圧を検出し、検出されたノズル内樹脂圧に基づいて速度制御からノズル内樹脂圧制御に切り替え、保圧工程及び計量工程中は、ノズル内樹脂圧を検出し、検出されたノズル内樹脂圧のフィードバック制御を行う技術が開示されている。
特許文献6では、計量が終了すると、ノズル開閉用バルブを閉鎖した状態でバルブの内側の樹脂圧を検出し、射出シリンダを制御して予圧を加え、続いてノズル開閉用バルブを開放して射出及び保圧を行う技術が開示されている。
Various techniques for performing feedback control by detecting the resin pressure in the nozzle have been proposed.
In Patent Document 5, the injection speed feedback control is performed during the injection process, the resin pressure in the nozzle is detected at the time of transition from the injection process to the pressure holding process, and the speed control is performed from the speed control based on the detected resin pressure in the nozzle. A technique is disclosed that switches to internal resin pressure control, detects the resin pressure in the nozzle during the pressure holding process and the metering process, and performs feedback control of the detected resin pressure in the nozzle.
In Patent Document 6, when the metering is completed, the resin pressure inside the valve is detected with the nozzle opening / closing valve closed, the injection cylinder is controlled to apply a preload, and then the nozzle opening / closing valve is opened for injection. In addition, a technique for holding pressure is disclosed.
特開昭60−76321号公報JP 60-76321 A 特開2006−327127号公報JP 2006-327127 A 特開2007−253388号公報JP 2007-253388 A 特開2007−253606号公報JP 2007-253606 A 特開平2−112921号公報Japanese Patent Laid-Open No. 2-12921 特開平4−336222号公報JP-A-4-336222
一般に、保圧工程や計量終了後の予備射出工程では、ロードセルなどの力検出手段を用いてスクリュがシリンダ内の圧縮された溶融樹脂から受ける力を検出し、検出した力とスクリュ断面積とに基づいて樹脂圧力を算出し、算出した樹脂圧力が所定値となるように圧力制御を行う方法が知られている。   In general, in the pressure holding process and the preliminary injection process after the completion of measurement, the force received by the screw from the compressed molten resin in the cylinder is detected using force detection means such as a load cell, and the detected force and the cross-sectional area of the screw are calculated. A method is known in which the resin pressure is calculated based on the pressure and pressure control is performed so that the calculated resin pressure becomes a predetermined value.
ところで、スクリュが受ける力は、スクリュ前方の圧縮された溶融樹脂から受ける反力だけでなく、スクリュ根元にある半溶融状態の樹脂による抵抗が含まれる。そのため、ロードセルを用いて検出した圧力(ロードセル検出値)は樹脂の抵抗による誤差を含む。一方、ノズル部に備えた圧力検出器(ノズル圧センサー)は、スクリュ根元にある半溶融樹脂の抵抗による誤差は排除できる。このため、ロードセルを用いて検出した圧力(ロードセル検出値)と実際の樹脂圧力(ノズル圧センサー検出値)と正確に一致しない場合がある(図1参照)。特に計量終了後の予備射出工程においては、樹脂圧力を正確に制御することで樹脂密度を均一にする必要があるため、樹脂圧力を正確に検出することが重要である。   By the way, the force received by the screw includes not only the reaction force received from the compressed molten resin in front of the screw but also the resistance due to the semi-molten resin at the screw base. Therefore, the pressure (load cell detection value) detected using the load cell includes an error due to the resistance of the resin. On the other hand, the pressure detector (nozzle pressure sensor) provided in the nozzle portion can eliminate errors due to the resistance of the semi-molten resin at the screw base. For this reason, the pressure (load cell detection value) detected using the load cell may not exactly match the actual resin pressure (nozzle pressure sensor detection value) (see FIG. 1). In particular, in the preliminary injection process after the completion of measurement, it is necessary to make the resin density uniform by accurately controlling the resin pressure, so it is important to accurately detect the resin pressure.
そこで、本発明は、上述した問題に鑑み、予備射出工程では樹脂の抵抗による誤差を排除した正確な圧力検出を行うことで高精度な計量を行うことが可能な射出成形機の圧力制御装置を提供することを目的とする。   Therefore, in view of the above-described problems, the present invention provides a pressure control device for an injection molding machine capable of performing high-precision weighing by performing accurate pressure detection that eliminates errors due to resin resistance in the preliminary injection process. The purpose is to provide.
本発明は、スクリュ前方の樹脂圧力を検出する樹脂圧力検出器を備え、予備射出工程においては前記樹脂圧力検出部で検出した樹脂圧力に基づいて圧力制御を行い、さらに、スクリュが軸方向に受ける力を検出する力検出器を備え、保圧工程においては、前記力検出器を用いて検出した力検出値に基づいて圧力制御を行うことを特徴とする。
なお、計量工程においては、前記樹脂圧力検出部で検出した樹脂圧力に基づいて圧力制御を行ってもよいし、前記力検出器を用いて検出した力検出値に基づいて圧力制御を行ってもよい。
The present invention includes a resin pressure detector that detects the resin pressure in front of the screw, performs pressure control based on the resin pressure detected by the resin pressure detection unit in the preliminary injection process, and further receives the screw in the axial direction. A force detector for detecting force is provided, and in the pressure holding step, pressure control is performed based on a force detection value detected using the force detector.
In the metering step, pressure control may be performed based on the resin pressure detected by the resin pressure detection unit, or pressure control may be performed based on the force detection value detected using the force detector. Good.
本願の請求項1に係る発明は、スクリュが軸方向に受ける力を検出する力検出部と、スクリュ前方の樹脂圧力を検出する樹脂圧力検出部と、スクリュを前後進させるためのスクリュ前後進駆動部と、スクリュを回転させるためのスクリュ回転駆動部とを備え、射出開始から計量開始までの間においてスクリュを前後進させて圧力制御を行う保圧部と、計量中にはスクリュを順方向に回転させながら、スクリュをあらかじめ設定された計量完了位置まで後退させる計量部と、計量終了後から射出開始までの間においてスクリュを軸方向に移動させて圧力制御を行う予備射出部とを有する射出成形機の圧力制御装置において、前記保圧部は、前記力検出部で検出した力に基づいて圧力制御を行い、前記予備射出部は、前記樹脂圧力検出部で検出した樹脂圧力に基づいて圧力制御を行うことを特徴とする射出成形機の圧力制御装置である。   The invention according to claim 1 of the present application is directed to a force detection unit that detects a force that the screw receives in the axial direction, a resin pressure detection unit that detects a resin pressure in front of the screw, and a screw forward and backward drive for moving the screw back and forth. And a screw rotation drive unit for rotating the screw, a pressure holding unit that performs pressure control by moving the screw back and forth between the start of injection and the start of measurement, and a screw in the forward direction during measurement. Injection molding having a measuring unit that rotates the screw back to a predetermined measurement completion position while rotating, and a preliminary injection unit that controls the pressure by moving the screw in the axial direction between the end of measurement and the start of injection In the pressure control device of the machine, the pressure holding unit performs pressure control based on the force detected by the force detection unit, and the preliminary injection unit is detected by the resin pressure detection unit. A pressure control device for an injection molding machine and performing pressure control based on the resin pressure.
請求項2に係る発明は、前記力検出部は、ロードセルであることを特徴とする請求項1に記載の射出成形機の圧力制御装置である。
請求項3に係る発明は、前記スクリュ前後進駆動部は、油圧駆動システムであり、前記力検出部は前記油圧駆動システムの圧力値に基づいてスクリュが軸方向に受ける力を検出することを特徴とする請求項1に記載の射出成形機の圧力制御装置である。
請求項4に係る発明は、前記樹脂圧力検出部は、ノズル圧センサーであることを特徴とする請求項1に記載の射出成形機の圧力制御装置である。
The invention according to claim 2 is the pressure control device for an injection molding machine according to claim 1, wherein the force detection unit is a load cell.
The invention according to claim 3 is characterized in that the screw forward / reverse drive unit is a hydraulic drive system, and the force detection unit detects a force that the screw receives in the axial direction based on a pressure value of the hydraulic drive system. The pressure control device for an injection molding machine according to claim 1.
The invention according to claim 4 is the pressure control device for an injection molding machine according to claim 1, wherein the resin pressure detection unit is a nozzle pressure sensor.
本発明によれば、予備射出工程においては前記ノズル部に備えた圧力検出器を用いて検出したノズル圧力検出値に基づいて圧力制御を行うため、樹脂の抵抗による誤差を排除した正確な圧力検出による高精度な計量を行うことが可能な射出成形機の圧力制御装置を提供することができる。   According to the present invention, in the preliminary injection step, pressure control is performed based on the nozzle pressure detection value detected using the pressure detector provided in the nozzle portion, so that accurate pressure detection that eliminates errors due to resin resistance is performed. Thus, it is possible to provide a pressure control device for an injection molding machine capable of performing high-precision weighing.
ところで、ノズル部に備えた圧力検出器は、スクリュ根元にある半溶融樹脂の抵抗による誤差は排除できるが、一般に、スクリュ後部に備えたロードセルに比べて信号検出の応答速度が遅いという問題がある。特に射出・保圧工程では、射出で上昇した圧力を保圧工程で減圧するなど、高い応答性で圧力を制御する必要があるため、信号検出の応答速度が速いことが重要である。本発明によれば、射出・保圧工程においては、前記ロードセルを用いて検出したロードセル圧力検出値に基づいて圧力制御を行うため、信号検出の応答速度が遅いという問題を解消し、高応答な圧力制御を行うことができる。   By the way, the pressure detector provided in the nozzle part can eliminate the error due to the resistance of the semi-molten resin at the screw base, but generally has a problem that the response speed of the signal detection is slower than the load cell provided in the rear part of the screw. . In particular, in the injection / holding process, it is necessary to control the pressure with high responsiveness, such as reducing the pressure increased by the injection in the pressure holding process, so it is important that the response speed of signal detection is fast. According to the present invention, in the injection / holding step, pressure control is performed based on the load cell pressure detection value detected using the load cell, so that the problem that the response speed of signal detection is slow is solved, and the response is high. Pressure control can be performed.
圧力検出の誤差要因を説明する図である。It is a figure explaining the error factor of pressure detection. 射出成形機および該射出成形機を制御する制御装置の概略構成図である。It is a schematic block diagram of the injection molding machine and the control apparatus which controls this injection molding machine. 射出成形機の制御装置において実行される処理のフローを説明する図である。It is a figure explaining the flow of the process performed in the control apparatus of an injection molding machine.
以下、本発明の実施形態を図面と共に説明する。
図2は、射出成形機および該射出成形機を制御する制御装置の概略構成図である。射出成形機は一般に機台上に射出装置と型締装置とを備えている。図2では射出装置の概略構成が示されている。制御装置30は射出成形機を全体的に制御する装置である。スクリュ3が挿入されたシリンダ1の先端にはノズル2が装着され、シリンダ1の後端部には樹脂ペレットをシリンダ1に供給するホッパ4が取り付けられている。スクリュ3は、スクリュ3をその軸方向に駆動する駆動手段としての射出用サーボモータM1、伝動機構7及びボールネジ/ナット等の回転運動を直線運動に変換する変換機構8によって軸方向に駆動され、射出及び背圧制御がなされるように構成されている。また、スクリュ3は、スクリュ3を回転させるための回転駆動手段としてのサーボモータM2と、ベルト、プーリ等で構成される伝動機構6により回転駆動されるようになっている。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 2 is a schematic configuration diagram of an injection molding machine and a control device that controls the injection molding machine. An injection molding machine generally includes an injection device and a mold clamping device on a machine base. FIG. 2 shows a schematic configuration of the injection apparatus. The control device 30 is a device that controls the entire injection molding machine. A nozzle 2 is attached to the tip of the cylinder 1 into which the screw 3 is inserted, and a hopper 4 for supplying resin pellets to the cylinder 1 is attached to the rear end of the cylinder 1. The screw 3 is driven in the axial direction by a conversion mechanism 8 that converts a rotary motion of the injection servomotor M1, a transmission mechanism 7, and a ball screw / nut, etc., as a drive means for driving the screw 3 in the axial direction thereof, into a linear motion, Injection and back pressure control are performed. The screw 3 is rotationally driven by a servo motor M2 as a rotational driving means for rotating the screw 3 and a transmission mechanism 6 including a belt, a pulley, and the like.
射出用サーボモータM1、スクリュ回転用サーボモータM2には、それぞれ、その回転位置・速度を検出する位置・速度検出器Penc1、位置・速度検出器Penc2が取り付けられている。これら位置・速度検出器Penc1,Penc2によって、スクリュ3の位置(スクリュ軸方向の位置)、移動速度(射出速度)、スクリュ3の回転速度を検出できる。また、スクリュ3に加わる溶融樹脂からのスクリュ軸方向に受ける力を検出するロードセル等の力検出器5が設けられている。   A position / speed detector Penc1 and a position / speed detector Penc2 for detecting the rotation position / speed are attached to the injection servomotor M1 and the screw rotation servomotor M2, respectively. These position / speed detectors Penc1 and Penc2 can detect the position of the screw 3 (position in the screw axis direction), the moving speed (injection speed), and the rotational speed of the screw 3. Further, a force detector 5 such as a load cell for detecting the force received in the axial direction of the screw from the molten resin applied to the screw 3 is provided.
射出シリンダ1のノズル取り付け部材にノズル圧センサー9が取り付けられている。ノズル圧センサー9により検出されたスクリュ前方の樹脂圧力の検出信号はA/D変換器10によりA/D変換された後、サーボCPU15に入力する。   A nozzle pressure sensor 9 is attached to the nozzle attachment member of the injection cylinder 1. The detection signal of the resin pressure in front of the screw detected by the nozzle pressure sensor 9 is A / D converted by the A / D converter 10 and then input to the servo CPU 15.
PMCCPU17には、射出成形機のシーケンス動作を制御するシーケンスプログラム等を記憶したROM18および演算データの一時記憶等に用いられるRAM19が接続されている。CNCCPU20には、射出成形機を全体的に制御する自動運転プログラム等を記憶したROM21および演算データの一時記憶等に用いられるRAM22が接続されている。   Connected to the PMCCPU 17 are a ROM 18 storing a sequence program for controlling the sequence operation of the injection molding machine and a RAM 19 used for temporary storage of calculation data. Connected to the CNC CPU 20 are a ROM 21 that stores an automatic operation program and the like for overall control of the injection molding machine, and a RAM 22 that is used for temporary storage of calculation data.
サーボCPU15には、位置ループ、速度ループ、電流ループの処理を行うサーボ制御専用の制御プログラムを格納したROM13やデータの一時記憶に用いられるRAM14が接続されている。更に、サーボCPU15には、サーボCPU15からの指令に基づいて、スクリュ回転用サーボモータM2を駆動するサーボアンプ12や、射出用サーボモータM1を駆動するサーボアンプ11が接続されている。   The servo CPU 15 is connected to a ROM 13 that stores a control program dedicated to servo control that performs processing of a position loop, a speed loop, and a current loop, and a RAM 14 that is used for temporary storage of data. Furthermore, the servo CPU 15 is connected to a servo amplifier 12 that drives a screw rotation servomotor M2 and a servo amplifier 11 that drives an injection servomotor M1 based on a command from the servo CPU15.
各サーボモータM1,M2には、前述したように、それぞれ位置・速度検出器Penc1,Penc2が取り付けられている。これら位置・速度検出器Penc1,Penc2からの出力が、サーボCPU15にフィードバックされる。サーボCPU15は、CNCCPU20から指令される各軸(射出用サーボモータM1、または、スクリュ回転用サーボモータM2)への移動指令と位置・速度検出器Penc1、位置・速度検出器Penc2からフィードバックされる検出位置と検出速度に基づいて、位置、速度のフィードバック制御を行うとともに、電流フィードバック制御も実行して、各サーボアンプ11,12を駆動制御する。   As described above, the position / speed detectors Penc1 and Penc2 are attached to the servomotors M1 and M2, respectively. Outputs from these position / velocity detectors Penc 1 and Penc 2 are fed back to the servo CPU 15. The servo CPU 15 receives a movement command to each axis (injection servo motor M1 or screw rotation servo motor M2) commanded from the CNC CPU 20, and detection fed back from the position / speed detector Penc1 and position / speed detector Penc2. Based on the position and detection speed, position and speed feedback control is performed, and current feedback control is also executed to drive-control the servo amplifiers 11 and 12.
また、位置・速度検出器Penc1からの位置フィードバック信号により、スクリュ3の前進位置(軸方向位置)を求める現在位置レジスタが設けられており、該現在位置レジスタによりスクリュ位置を検出できるように構成されている。また、サーボCPU15には、力検出器5での検出信号をA/D変換器16でデジタル信号に変換した樹脂圧力(スクリュにかかる樹脂圧力)が入力されている。   Further, a current position register for obtaining the forward position (axial position) of the screw 3 by a position feedback signal from the position / speed detector Penc1 is provided, and the screw position can be detected by the current position register. ing. Further, the servo CPU 15 receives a resin pressure (resin pressure applied to the screw) obtained by converting the detection signal from the force detector 5 into a digital signal by the A / D converter 16.
液晶表示装置などで構成される表示装置を有する表示装置付き入力装置25は、表示回路24を介してバス26に接続されている。さらに、不揮発性メモリで構成される成形データ保存用RAM23もバス26に接続されている。この成形データ保存用RAM23には射出成形作業に関する成形条件と各種設定値、パラメータ、マクロ変数等を記憶する。   An input device 25 with a display device having a display device composed of a liquid crystal display device or the like is connected to a bus 26 via a display circuit 24. Further, a molding data storage RAM 23 composed of a nonvolatile memory is also connected to the bus 26. The molding data storage RAM 23 stores molding conditions relating to injection molding work, various set values, parameters, macro variables, and the like.
以上の構成により、PMCCPU17が射出成形機全体のシーケンス動作を制御し、CNCCPU20がROM21の運転プログラムや成形データ保存用RAM23に格納された成形条件等に基づいて各軸のサーボモータM1,M2に対して移動指令の分配を行ない、サーボCPU15は、各軸(射出用サーボモータM1やスクリュ回転用サーボモータM2)に対して分配された移動指令と、位置・速度検出器Penc1,Penc2で検出された位置および速度のフィードバック信号等に基づいて、従来と同様に位置ループ制御、速度ループ制御、さらには電流ループ制御のサーボ制御を行い、いわゆるデジタルサーボ処理を実行する。   With the above configuration, the PMC CPU 17 controls the sequence operation of the entire injection molding machine, and the CNC CPU 20 controls the servo motors M1 and M2 for each axis based on the operating conditions stored in the ROM 21 and the molding conditions stored in the molding data storage RAM 23. The servo CPU 15 detects the movement command distributed to each axis (the injection servo motor M1 and the screw rotation servo motor M2) and the position / speed detectors Penc1 and Penc2. Based on the position and velocity feedback signals and the like, servo control of position loop control, velocity loop control, and current loop control is performed in the same manner as in the past, and so-called digital servo processing is executed.
射出成形機における成形動作工程には、大きく分けて、型締装置において金型を閉じ型締めを行う型閉工程、射出装置においてスクリュを前進させて溶融樹脂を金型内に射出し充填させる射出工程、溶融樹脂が金型内に充填された後、金型内の樹脂の圧力を制御する保圧工程、金型内の樹脂を冷却する冷却工程、スクリュに背圧をかけながら回転させて樹脂を溶融させ、該溶融樹脂を計量する計量工程、計量終了後から射出開始までの間においてスクリュ3を軸方向に移動させて圧力制御を行う予備射出工程、型締装置において金型を開く型開工程、金型内から成形品を突き出して取り出す突出工程(エジェクト工程)等がある。そして、一般に、射出成形機の射出保圧の制御方法として、射出開始から所定のスクリュ位置に到達するまではスクリュ位置・速度制御を行い、所定のスクリュ位置(射出保圧切替位置)に到達した後は圧力制御に切替えて、保圧を行う制御方法が広く採用されている。   The molding operation process in the injection molding machine is roughly divided into a mold closing process in which the mold is closed and clamped in the mold clamping apparatus, and an injection in which the molten resin is injected into the mold and filled by advancing the screw in the injection apparatus. After the molten resin is filled in the mold, the pressure holding process for controlling the pressure of the resin in the mold, the cooling process for cooling the resin in the mold, and the resin by rotating while applying back pressure to the screw A measurement process for measuring the molten resin, a preliminary injection process for controlling the pressure by moving the screw 3 in the axial direction between the end of measurement and the start of injection, and opening the mold in the mold clamping device There exist a process, the protrusion process (eject process) etc. which ejects a molded product from the inside of a metal mold | die. In general, as a method for controlling the injection holding pressure of the injection molding machine, the screw position / speed control is performed from the start of injection until the predetermined screw position is reached, and the predetermined screw position (injection holding pressure switching position) is reached. After that, a control method of switching to pressure control and holding pressure is widely adopted.
本発明によれば、射出・保圧工程においては、前記力検出器5を用いて検出した力検出値に基づいて圧力制御を行うため、信号検出の応答速度に遅れを生じること無く、高応答な圧力制御を行うことができる。そして、予備射出工程においては、前記ノズル部に備えたノズル圧センサー9を用いて検出したノズル圧センサー検出値に基いて圧力制御を行うため、スクリュ根元にある半溶融樹脂の抵抗による誤差を排除して樹脂圧力を正確に検出できることから、樹脂圧力を正確に制御することができ樹脂密度を均一にすることができる。   According to the present invention, in the injection / holding step, pressure control is performed based on the force detection value detected using the force detector 5, so that a high response can be achieved without causing a delay in the signal detection response speed. Pressure control can be performed. In the preliminary injection process, since pressure control is performed based on the detected value of the nozzle pressure sensor detected by using the nozzle pressure sensor 9 provided in the nozzle portion, errors due to the resistance of the semi-molten resin at the screw base are eliminated. Since the resin pressure can be accurately detected, the resin pressure can be accurately controlled and the resin density can be made uniform.
ここで、スクリュ3が軸方向に受ける力を検出する力検出部と、スクリュ3の前方の樹脂圧力を検出する樹脂圧力検出部と、圧力制御部について補足して説明する。
<スクリュが軸方向に受ける力を検出する力検出部について>
力検出部は、ロードセルとしてもよい。また、スクリュ前後進駆動部の駆動力をスクリュに伝える部材に歪みゲージを設置して、スクリュが軸方向に受ける力を検出するようにしてもよい。また、スクリュ前後進駆動部は油圧駆動システムであり、力検出部は前記油圧駆動システムの圧力値に基づいてスクリュが軸方向に受ける力を検出するようにしてもよい。また、スクリュ前後進駆動部はサーボモータであり、力検出部はサーボモータの駆動力、またはサーボモータの受ける力に基づいてスクリュが軸方向に受ける力を検出するようにしてもよい。
Here, the force detector that detects the force that the screw 3 receives in the axial direction, the resin pressure detector that detects the resin pressure in front of the screw 3, and the pressure controller will be described supplementarily.
<About the force detection part that detects the force that the screw receives in the axial direction>
The force detection unit may be a load cell. In addition, a strain gauge may be installed on a member that transmits the driving force of the screw forward / reverse drive unit to the screw, and the force that the screw receives in the axial direction may be detected. The screw forward / reverse drive unit may be a hydraulic drive system, and the force detection unit may detect a force that the screw receives in the axial direction based on a pressure value of the hydraulic drive system. The screw forward / reverse drive unit may be a servo motor, and the force detection unit may detect the force that the screw receives in the axial direction based on the driving force of the servo motor or the force received by the servo motor.
<スクリュ前方の樹脂圧力を検出する樹脂圧力検出部について>
樹脂圧力検出部はノズル圧センサーとしてもよい。また、射出シリンダの前方部分やノズル取り付け部材に圧力センサーを備え、スクリュ前方の樹脂圧力を検出するようにしてもよい。ノズル圧センサーはノズル内の樹脂に接触して直接、樹脂圧力を検出するものでも、ノズル部材に取り付けられた歪ゲージによって間接的に樹脂圧力を検出するものでもよい。
<About the resin pressure detector that detects the resin pressure in front of the screw>
The resin pressure detection unit may be a nozzle pressure sensor. Moreover, a pressure sensor may be provided in the front part of the injection cylinder or the nozzle mounting member to detect the resin pressure in front of the screw. The nozzle pressure sensor may be a sensor that directly detects the resin pressure in contact with the resin in the nozzle, or a sensor that indirectly detects the resin pressure using a strain gauge attached to the nozzle member.
<圧力制御部について>
圧力制御部は、検出した圧力が所定値と一致するようにスクリュを前後進するようにしてもよい。また、検出した圧力が所定値と一致するまでスクリュを前進または後退させ、検出した圧力が所定値と一致した時点でスクリュを停止するようにしてもよい。なお、保圧工程における圧力制御の方式と予備射出工程における圧力制御の方式は、同じであってもよいし、異なる方式であってもよい。
<About pressure control unit>
The pressure control unit may move the screw back and forth so that the detected pressure matches a predetermined value. Alternatively, the screw may be moved forward or backward until the detected pressure matches a predetermined value, and the screw may be stopped when the detected pressure matches the predetermined value. The pressure control method in the pressure holding process and the pressure control method in the preliminary injection process may be the same or different.
図3は本発明の実施形態における処理のフローを説明する図である。以下、各ステップに従って説明する。なお、ここでは、射出成形機の型締装置に関連する工程は記載していない。
●[ステップSA01]射出工程を実行する。
●[ステップSA02]保圧工程を実行する。保圧工程ではロードセル検出値に基づいて圧力制御を行う。
●[ステップSA03]計量工程を実行する。
●[ステップSA04]予備射出工程を実行する。予備射出工程では、ノズル圧センサー検出値に基づいて圧力制御を行う。
●[ステップSA05]サイクル終了か否か判断し、サイクル終了でなければステップSA01へ戻り、サイクル終了であれば処理を終了する。
FIG. 3 is a diagram for explaining the flow of processing in the embodiment of the present invention. Hereinafter, it demonstrates according to each step. In addition, the process relevant to the mold clamping apparatus of an injection molding machine is not described here.
[Step SA01] The injection process is executed.
[Step SA02] A pressure holding process is executed. In the pressure holding step, pressure control is performed based on the load cell detection value.
[Step SA03] The weighing process is executed.
[Step SA04] A preliminary injection process is executed. In the preliminary injection process, pressure control is performed based on the detected value of the nozzle pressure sensor.
[Step SA05] It is determined whether or not the cycle is finished. If the cycle is not finished, the process returns to Step SA01, and if the cycle is finished, the process is finished.
1 シリンダ
2 ノズル
3 スクリュ
4 ホッパ
5 力検出器
6,7 伝動機構
8 変換機構
9 ノズル圧センサー
10 A/D変換器
11 サーボアンプ
12 サーボアンプ
13 ROM
14 RAM
15 サーボCPU
16 A/D変換器
17 PMCCPU
18 ROM
19 RAM
20 CNCCPU
21 ROM
22 RAM
23 成形データ保存用RAM
24 表示回路
25 表示装置付き入力装置
26 バス

30 制御装置

Penc1 位置・速度検出器
Penc2 位置・速度検出器
M1 射出用サーボモータ
M2 スクリュ回転用サーボモータ
DESCRIPTION OF SYMBOLS 1 Cylinder 2 Nozzle 3 Screw 4 Hopper 5 Force detector 6, 7 Power transmission mechanism 8 Conversion mechanism 9 Nozzle pressure sensor 10 A / D converter 11 Servo amplifier 12 Servo amplifier 13 ROM
14 RAM
15 Servo CPU
16 A / D converter 17 PMCCPU
18 ROM
19 RAM
20 CNCCPU
21 ROM
22 RAM
23 Molding data storage RAM
24 Display Circuit 25 Input Device with Display Device 26 Bus

30 Control device

Penc1 Position / Speed Detector Penc2 Position / Speed Detector M1 Injection Servo Motor M2 Screw Rotation Servo Motor

Claims (4)

  1. スクリュが軸方向に受ける力を検出する力検出部と、スクリュ前方の樹脂圧力を検出する樹脂圧力検出部と、スクリュを前後進させるためのスクリュ前後進駆動部と、スクリュを回転させるためのスクリュ回転駆動部とを備え、
    射出開始から計量開始までの間においてスクリュを前後進させて圧力制御を行う保圧部と、計量中にはスクリュを順方向に回転させながら、スクリュをあらかじめ設定された計量完了位置まで後退させる計量部と、計量終了後から射出開始までの間においてスクリュを軸方向に移動させて圧力制御を行う予備射出部とを有する射出成形機の圧力制御装置において、
    前記保圧部は、前記力検出部で検出した力に基づいて圧力制御を行い、前記予備射出部は、前記樹脂圧力検出部で検出した樹脂圧力に基づいて圧力制御を行うことを特徴とする射出成形機の圧力制御装置。
    A force detection unit that detects the axial force applied to the screw, a resin pressure detection unit that detects the resin pressure in front of the screw, a screw forward / reverse drive unit for moving the screw back and forth, and a screw for rotating the screw A rotation drive unit,
    A pressure holding part that controls the pressure by moving the screw back and forth between the start of injection and the start of measurement, and a meter that moves the screw back to a preset measurement completion position while rotating the screw in the forward direction during measurement. In a pressure control device of an injection molding machine having a portion and a preliminary injection unit that performs pressure control by moving the screw in the axial direction between the end of measurement and the start of injection,
    The pressure holding unit performs pressure control based on the force detected by the force detection unit, and the preliminary injection unit performs pressure control based on the resin pressure detected by the resin pressure detection unit. Pressure control device for injection molding machines.
  2. 前記力検出部は、ロードセルであることを特徴とする請求項1に記載の射出成形機の圧力制御装置。   The pressure control apparatus for an injection molding machine according to claim 1, wherein the force detection unit is a load cell.
  3. 前記スクリュ前後進駆動部は、油圧駆動システムであり、前記力検出部は前記油圧駆動システムの圧力値に基づいてスクリュが軸方向に受ける力を検出することを特徴とする請求項1に記載の射出成形機の圧力制御装置。   The screw forward / reverse drive unit is a hydraulic drive system, and the force detection unit detects a force that the screw receives in an axial direction based on a pressure value of the hydraulic drive system. Pressure control device for injection molding machines.
  4. 前記樹脂圧力検出部は、ノズル圧センサーであることを特徴とする請求項1に記載の射出成形機の圧力制御装置。   The pressure control apparatus for an injection molding machine according to claim 1, wherein the resin pressure detection unit is a nozzle pressure sensor.
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DE102013009368A1 (en) 2013-12-12

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