JPH0464497B2 - - Google Patents
Info
- Publication number
- JPH0464497B2 JPH0464497B2 JP7994388A JP7994388A JPH0464497B2 JP H0464497 B2 JPH0464497 B2 JP H0464497B2 JP 7994388 A JP7994388 A JP 7994388A JP 7994388 A JP7994388 A JP 7994388A JP H0464497 B2 JPH0464497 B2 JP H0464497B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- injection
- molding machine
- injection molding
- controlling
- 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 55
- 239000007924 injection Substances 0.000 claims description 55
- 238000000034 method Methods 0.000 claims description 34
- 238000001746 injection moulding Methods 0.000 claims description 25
- 238000000465 moulding Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 239000012778 molding material Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 10
- 238000001514 detection method Methods 0.000 description 9
- 239000011347 resin Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000113 methacrylic resin Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は射出成形機の制御方法、特にスクリユ
の制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of controlling an injection molding machine, and particularly to a method of controlling a screw.
一般に、インラインスクリユ式射出成形機は、
後部に成形材料を供給するホツパを配した加熱筒
を備え、この加熱筒に進退及び回転が制御される
スクリユを内挿して構成する。そして、計量工程
ではスクリユを回転させてスクリユ前方に溶融樹
脂材料を蓄積するとともに、射出工程ではスクリ
ユを前進させて金型への射出充填を行う。このた
め、射出速度や射出圧力（保圧圧力）等を正確に
制御することは、高精度、高品質、かつ安定した
成形品を確保する上で極めて重要となる。
In general, in-line screw injection molding machines are
A heating cylinder is provided with a hopper for supplying molding material at the rear, and a screw whose advance/retreat and rotation is controlled is inserted into the heating cylinder. In the metering step, the screw is rotated to accumulate molten resin material in front of the screw, and in the injection step, the screw is moved forward to inject and fill the mold. Therefore, accurately controlling the injection speed, injection pressure (holding pressure), etc. is extremely important to ensure high precision, high quality, and stable molded products.
〔発明が解決しようとする問題点〕
ところで、このようなインラインスクリユ式射
出成形機は次のような問題点がある。[Problems to be Solved by the Invention] Incidentally, such an in-line screw type injection molding machine has the following problems.
まず、成形材料に起因する問題である。 First, there is a problem caused by the molding material.
第４図に示すように、スクリユ６１を内挿した
加熱筒６２には、スクリユ６１の軸方向に対し垂
直方向に形成した材料供給路（ホツパ）６３から
成形材料Ｗが供給される。この場合、成形材料Ｗ
として固定材料（ペレツト）、特にアクリル樹脂、
ポリカーボネイト樹脂、ガラス入り樹脂等のよう
に硬質材料であつて、しかも、スクリユ６１の溝
部６１ｄの深さが成形材料Ｗの大きさに比べて浅
い場合には、スクリユ６１の前進時（矢印Ａ方
向）に、材料供給路６３の下端エツジ６４とスク
リユ６１の山部６１ｈによつて溝部６１ｄに存在
する固形材料が剪断され、スクリユ６１に対して
抵抗力が発生する。 As shown in FIG. 4, molding material W is supplied to the heating cylinder 62 into which the screw 61 is inserted from a material supply path (hopper) 63 formed perpendicularly to the axial direction of the screw 61. In this case, the molding material W
As fixed materials (pellets), especially acrylic resins,
When the screw 61 is made of a hard material such as polycarbonate resin or glass-filled resin, and the depth of the groove 61d of the screw 61 is shallow compared to the size of the molding material W, when the screw 61 moves forward (in the direction of arrow A), ), the solid material present in the groove 61d is sheared by the lower edge 64 of the material supply path 63 and the peak 61h of the screw 61, and a resistance force is generated against the screw 61.
また、計量終了後のスクリユ回転方向の停止位
置、即ち、射出開始位置は成形サイクル毎にも異
なるため、結局、この場合にも成形材料Ｗの配列
状態、密度、数量等に違いを生じ、スクリユ６１
に対する抵抗力発生位置がシヨツト毎にバラつい
てしまう。この状態を第３図及び第５図を用いて
説明する。第３図中Ｒ１，Ｒ２，Ｒ３で示す点線
は、従来の射出成形機における射出工程の時間対
射出圧力の代表的実測値を三回分示したものであ
る。これにより明らかなように、射出圧力の波形
は三回とも大きくバラついている。なお、このと
きの条件は直径19mmのスクリユによりPMMA樹
脂（メタクリル樹脂）を成形した。一方、第５図
は一定の射出速度でパージング射出、即ち、ノズ
ルタツチ後に計量し、この後射出ノズルを後退さ
せて射出するいわゆる空打ちを行つたときの射出
圧力の連続する三回分の実測値を示す。これより
明らかなように、空打ち時には各シヨツト毎に数
回の山形波形が記録されるが、山と山の間隔はほ
ぼ等しく規則的である。即ち、S1a≒S1b≒S2a
≒S2b≒S3aとなる。山形波形から算出される圧
力を射出圧力へ換算すれば50〜200Kgにも達し、
射出力が３トン以下の小型射出成形機では無視で
きない大きな値となる。 Furthermore, since the stop position in the direction of screw rotation after measurement, that is, the injection start position, differs for each molding cycle, this also results in differences in the arrangement, density, quantity, etc. of the molding material W, and the screw 61
The position where the resistance force is generated varies from shot to shot. This state will be explained using FIGS. 3 and 5. The dotted lines indicated by R1, R2, and R3 in FIG. 3 indicate three representative actual measured values of injection pressure versus time during the injection process in a conventional injection molding machine. As is clear from this, the waveforms of the injection pressure varied greatly in all three cases. Note that the conditions at this time were that PMMA resin (methacrylic resin) was molded using a screw having a diameter of 19 mm. On the other hand, Figure 5 shows the actual measured values of the injection pressure for three successive times when purging injection is performed at a constant injection speed, that is, when the nozzle is measured after touching it and then the injection nozzle is moved back to perform injection. show. As is clear from this, several chevron-shaped waveforms are recorded for each shot during dry firing, but the intervals between the crests are almost equal and regular. That is, S1a≒S1b≒S2a
≒S2b≒S3a. If the pressure calculated from the chevron waveform is converted to injection pressure, it can reach 50 to 200 kg,
For a small injection molding machine with an injection force of 3 tons or less, this is a large value that cannot be ignored.
一方、射出成形機側に起因する問題がある。即
ち、金型キヤビテイ内部における樹脂圧力を直接
検出できれば理想的であるが、現実には技術的に
も困難を伴うため、通常は圧力センサを駆動部側
に配設している。例えば、油圧式射出成形機の場
合には、射出シリンダ内の油圧を液圧センサ等の
圧力センサにより検出し、また、電動式射出成形
機の場合には、スクリユの反力をロードセル等の
圧力センサによつて検出している。そして、圧力
センサからの検出信号（検出値）と射出圧力（保
圧圧力）の設定値が一致するようにクローズドル
ープによる制御を行つている。 On the other hand, there are problems caused by the injection molding machine. That is, it would be ideal if the resin pressure inside the mold cavity could be directly detected, but in reality this is technically difficult, so the pressure sensor is usually disposed on the drive section side. For example, in the case of a hydraulic injection molding machine, the hydraulic pressure in the injection cylinder is detected by a pressure sensor such as a hydraulic pressure sensor, and in the case of an electric injection molding machine, the reaction force of the screw is detected by the pressure of a load cell, etc. Detected by a sensor. Then, closed-loop control is performed so that the detection signal (detection value) from the pressure sensor matches the set value of the injection pressure (holding pressure).
しかし、このような圧力検出方法ではスクリユ
６１の前方に存在する溶融樹脂材料の圧力に加
え、前述した材料供給路６３付近の成形材料Ｗに
基づく抵抗をも検出してしまう。結局、当該抵抗
のバラつきは直接的に圧力センサの検出値に影響
し、クローズドループ制御にも拘わらず、本来検
出すべき溶融樹脂の圧力を正確に検出できず、高
品質で高精度、かつ安定した成形品を得ることが
できない問題があつた。 However, in such a pressure detection method, in addition to the pressure of the molten resin material existing in front of the screw 61, the resistance based on the molding material W near the material supply path 63 described above is also detected. In the end, the variation in resistance directly affects the detection value of the pressure sensor, and despite closed-loop control, the pressure of the molten resin that should be detected cannot be accurately detected, resulting in high quality, high precision, and stable There was a problem that it was not possible to obtain a molded product.
本発明は上述した問題点を解決した射出成形機
の制御方法の提供を目的とするもので、以下に示
す制御方法によつて達成される。
The present invention aims to provide a control method for an injection molding machine that solves the above-mentioned problems, and is achieved by the control method described below.
即ち、本発明に係る射出成形機の制御方法は、
特に、インラインスクリユ式射出成形機に適用
し、射出開始位置におけるスクリユ２の山部（溝
部）の位置（回転方向位置）Ｍを加熱筒３に対し
同一位置となるように成形サイクル毎に制御する
ことを特徴としている。この場合、計量終了時
に、スクリユ２を進退方向に固定するとともに、
スクリユ２を計量時の回転方向に対し逆方向へ回
転させ、スクリユ２の回転角度の実測値と予め設
計した設定値を一致させるように制御するか又
は、計量工程中にスクリユが進退方向の所定位置
に達し、かつスクリユ回転角度の実測値が設定値
に達したらスクリユの回転を停止して計量工程を
終了するように制御する。また、必要により、射
出時においてスクリユ２を、計量時の回転方向に
対し逆方向へ所定速度で回転させる制御を併用す
ることができる。 That is, the method for controlling an injection molding machine according to the present invention is as follows:
In particular, it is applied to an in-line screw type injection molding machine, and the position (rotational direction position) M of the crest (groove) of the screw 2 at the injection start position is controlled in each molding cycle so that it is at the same position with respect to the heating cylinder 3. It is characterized by In this case, at the end of the measurement, the screw 2 is fixed in the forward and backward directions, and
Either the screw 2 is rotated in the opposite direction to the rotation direction during weighing and controlled so that the actual measured value of the rotation angle of the screw 2 matches a pre-designed set value, or the screw is rotated in a predetermined forward/backward direction during the weighing process. When the position is reached and the actual value of the screw rotation angle reaches the set value, the screw rotation is stopped and the measuring process is controlled to end. Furthermore, if necessary, control may be used to rotate the screw 2 at a predetermined speed in a direction opposite to the direction of rotation during metering during injection.
次に、本発明の作用について説明する。 Next, the operation of the present invention will be explained.
本発明に係る制御方法は、射出開始位置におけ
るスクリユ２の山部の位置Ｍが成形サイクル毎に
同一となるため、射出工程における射出圧力の波
形パターンが各成形サイクル毎にほぼ同じとな
る。よつて、成形材料がスクリユ２の前進に伴つ
て剪断される際の抵抗は、各成形サイクル毎にバ
ラつきがなくなり、成形の均一化が図れる。 In the control method according to the present invention, since the position M of the peak of the screw 2 at the injection start position is the same for each molding cycle, the waveform pattern of the injection pressure in the injection process is almost the same for each molding cycle. Therefore, the resistance when the molding material is sheared as the screw 2 advances does not vary from molding cycle to molding cycle, and uniform molding can be achieved.
以下には本発明に係る好適な実施例を図面に基
づき詳細に説明する。
Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.
まず、本発明方法を実施できるインラインスク
リユ式射出成形機の原理構成について第１図を参
照して説明する。同図は射出成形機における射出
装置の模式的ブロツク回路図を示す。 First, the principle structure of an in-line screw injection molding machine capable of carrying out the method of the present invention will be explained with reference to FIG. This figure shows a schematic block circuit diagram of an injection device in an injection molding machine.
３は加熱筒であり、前端に射出ノズル１２を備
えるとともに、後部上端に成形材料を加熱筒３内
へ供給するホツパ１３を備える。加熱筒３にはス
クリユ２を内挿する。スクリユ２の後端はスクリ
ユ回転軸１４に結合し、さらにスクリユ回転軸１
４はベースブロツク１５の前端に回転自在連結す
る。また、ベースブロツク１５とスクリユ回転軸
１４間には射出圧力を検出するロードセル１６を
介設する。そして、ロードセル１６の検出情報は
中央制御部２２へ付与する。なお、中央制御部２
２はCPU、RAM、ROM等から構成するマイク
ロコンピユータ機能を備える制御装置である。一
方、スクリユ回転軸１４には被動ギア１７を設
け、タイミングベルト１８を介して計量用サーボ
モータ１９のシヤフトに設けた駆動ギア２０に接
続する。中央制御部２２にはモータ制御部２１を
介して当該サーボモータ１９を駆動制御する。ま
た、サーボモータ１９にはタコメータジエネレー
タ２３を付設し、同モータ１９の回転速度を検出
することによつてクローズドループによる速度制
御を行う。さらにまた、スクリユ回転軸１４には
回転軸ギア２４を設け、このギア２４はタイミン
グベルト２７を介してスクリユ回転角度を検出す
るアブソリユートエンコーダ２５のシヤフトに設
けたエンコーダギア２６に接続する。そして、同
エンコーダ２５の検出情報は比較器２８に付与
し、スクリユ回転角度設定器２９において予め設
定された回転角度の設定値と比較し、そのエラー
情報を中央制御部２２に付与する。 3 is a heating cylinder, which is equipped with an injection nozzle 12 at its front end and a hopper 13 for supplying molding material into the heating cylinder 3 at its rear upper end. A screw 2 is inserted into the heating cylinder 3. The rear end of the screw 2 is connected to the screw rotation shaft 14, and the rear end of the screw 2 is connected to the screw rotation shaft 14.
4 is rotatably connected to the front end of the base block 15. Further, a load cell 16 for detecting injection pressure is interposed between the base block 15 and the screw rotating shaft 14. Then, the detection information of the load cell 16 is given to the central control section 22. In addition, the central control unit 2
2 is a control device equipped with a microcomputer function consisting of a CPU, RAM, ROM, etc. On the other hand, a driven gear 17 is provided on the screw rotation shaft 14, and is connected via a timing belt 18 to a drive gear 20 provided on the shaft of a metering servo motor 19. The central control section 22 drives and controls the servo motor 19 via the motor control section 21 . Further, a tachometer generator 23 is attached to the servo motor 19, and by detecting the rotational speed of the motor 19, closed loop speed control is performed. Furthermore, the screw rotation shaft 14 is provided with a rotation shaft gear 24, and this gear 24 is connected via a timing belt 27 to an encoder gear 26 provided on the shaft of an absolute encoder 25 that detects the screw rotation angle. Then, the detection information of the encoder 25 is provided to a comparator 28 and compared with a preset rotation angle setting value in a screw rotation angle setting device 29, and the error information is provided to the central control section 22.
他方、ベースブロツク１５の後端にはボールネ
ジ機構３０を介して進退駆動軸３１を連結する。
進退駆動軸３１は正逆回転により、ベースブロツ
ク１５を軸方向へ進退移動できる。進退駆動軸３
１の後端には被動ギア３２を設け、タイミングベ
ルト３３を介して射出用サーボモータ３４のシヤ
フトに設けた駆動ギア３５接続する。中央制御部
２２はモータ制御部３６を介してサーボモータ３
４を駆動制御する。また、サーボモータ３４には
パルスエンコーダ３７を付設し、スクリユ位置及
び射出速度の検出情報を中央制御部２２へ付与す
る。 On the other hand, a forward and backward drive shaft 31 is connected to the rear end of the base block 15 via a ball screw mechanism 30.
The forward and backward drive shaft 31 can move the base block 15 forward and backward in the axial direction by rotating forward and backward. Advance/retreat drive shaft 3
1 is provided with a driven gear 32 at the rear end thereof, and is connected to a drive gear 35 provided to the shaft of an injection servo motor 34 via a timing belt 33. The central control unit 22 controls the servo motor 3 via the motor control unit 36.
4 is driven and controlled. Further, a pulse encoder 37 is attached to the servo motor 34 to provide detected information on the screw position and injection speed to the central control unit 22.
次に、本発明に係る射出成形機の制御方法を含
む成形工程について説明する。 Next, a molding process including a method for controlling an injection molding machine according to the present invention will be explained.
まず、計量工程では中央制御部２２から計量指
令信号及び計量値信号をモータ制御回路２１へ付
与し、計量用サーボモータ１９を正回転駆動して
計量を行う。 First, in the weighing process, a weighing command signal and a weighing value signal are applied from the central control unit 22 to the motor control circuit 21, and the weighing servo motor 19 is driven to rotate in the forward direction to perform weighing.
計量が終了すると、中央制御部２２は射出用サ
ーボモータ３４にロツク指令を付与し、スクリユ
２を進退方向に固定する。一方、アブソリユート
エンコーダ２５からはスクリユ２の回転角度が検
出される。検出された実測値は比較器２８に付与
され、スクリユ回転角設定器２９の設定値と比較
してそのエラー情報が中央制御部２２に付与され
る。この結果、中央制御部２２はモータ制御回路
２１に計量時の回転方向に対し逆方向に回転指令
を与え、当該エラー情報が零になるまで計量用サ
ーボモータ１９を駆動制御する。以上の制御は成
形サイクル毎に行う。よつて、射出開始位置にお
けるスクリユ２の山部（溝部）の位置（回転方向
位置）を加熱筒３に対して同一とすることがで
き、成形サイクル毎に一致させることができる。
即ち、第２図のように、ホツパ１３と平面から見
た場合、ホツパ１３に現れるスクリユ２の山部２
ｈの位置Ｍが少なくとも加熱筒３の前後方向所定
位置Ｈに対して一致するように制御する。なお、
仮想線２ｓは山部２ｈが本来の制御すべき位置か
らズレている場合を示している。 When the measurement is completed, the central control section 22 gives a lock command to the injection servo motor 34 to fix the screw 2 in the forward and backward directions. On the other hand, the absolute encoder 25 detects the rotation angle of the screw 2. The detected actual measurement value is provided to a comparator 28, compared with the set value of the screw rotation angle setting device 29, and error information thereof is provided to the central control section 22. As a result, the central control unit 22 gives a rotation command to the motor control circuit 21 in the opposite direction to the rotation direction during metering, and drives and controls the metering servo motor 19 until the error information becomes zero. The above control is performed for each molding cycle. Therefore, the position (rotational direction position) of the crest (groove) of the screw 2 at the injection start position can be made the same with respect to the heating cylinder 3, and can be made the same for each molding cycle.
That is, as shown in FIG.
Control is performed so that the position M of h corresponds at least to a predetermined position H of the heating cylinder 3 in the longitudinal direction. In addition,
A virtual line 2s indicates a case where the peak portion 2h is deviated from the original position to be controlled.
一方、同様の制御を計量中に行うこともでき
る。即ち、計量工程において、スクリユ２の位置
が計量設定値になつたら、スクリユ２の回転速度
を低速に制御し、この後、スクリユ回転角度の実
測値が設定値に一致したなら、スクリユ２の回転
を停止して計量工程を終了させればよい。この場
合、スクリユ回転角度を一致させる都合上計量終
了時のスクリユ位置にわずかではあるがバラツキ
を生じる。しかし、これは保圧切換をスクリユ位
置によつて行なう射出制御方法の場合には計量終
了後のスクリユ位置を検出し、この検出結果によ
つて計量誤差の補正値を演算することにより、保
圧切換位置の設定値を自動補正すればよい。 On the other hand, similar control can also be performed during measurement. That is, in the weighing process, when the position of the screw 2 reaches the measurement setting value, the rotation speed of the screw 2 is controlled to a low speed, and after that, when the actual value of the screw rotation angle matches the set value, the rotation of the screw 2 is controlled to a low speed. It is sufficient to stop the metering process to complete the weighing process. In this case, in order to match the screw rotation angles, there will be slight variations in the screw position at the end of measurement. However, in the case of an injection control method in which the holding pressure is switched by the screw position, the holding pressure is changed by detecting the screw position after metering is completed and calculating a correction value for the metering error based on this detection result. What is necessary is to automatically correct the set value of the switching position.
また、スクリユ回転角度の設定値は射出ストロ
ークエンド或はその近傍において成形材料がスク
リユ２の山部と材料供給路の下端エツジとの間に
挟まれない値がより望ましい。このため、材料供
給路に近接スイツチ等を配設し、射出ストローク
エンド時にスクリユ２の山部の位置を検出すると
ともに、スクリユ２のピツチから自動演算してス
クリユ回転角度の設定値を与えればよい。 Further, it is preferable that the setting value of the screw rotation angle is such that the molding material is not caught between the peak of the screw 2 and the lower edge of the material supply path at or near the end of the injection stroke. For this reason, a proximity switch or the like may be installed in the material supply path to detect the position of the peak of the screw 2 at the end of the injection stroke, and to automatically calculate the screw rotation angle setting value based on the pitch of the screw 2. .
一方、以上の工程が終了すると射出工程へ移行
する。射出工程においては金型（不図示）の型閉
終了に基づいて中央制御部２２から射出指令信号
及ひ射出速度指令信号をモータ制御回路３６へ付
与する。これにより、射出用サーボモータ３４が
回転しスクリユ２を前進せしめ、射出充填が行わ
れる。 On the other hand, when the above steps are completed, the process moves to the injection step. In the injection process, an injection command signal and an injection speed command signal are applied from the central control unit 22 to the motor control circuit 36 based on the completion of closing of a mold (not shown). As a result, the injection servo motor 34 rotates to move the screw 2 forward, and injection filling is performed.
なお、この際、中央制御部２２は計量用サーボ
モータ１９を駆動し、スクリユ２を計量時の回転
方向に対し逆方向へ回転させることが望ましい。
これにより、射出工程でのスクリユ２は設定速度
で前進すると同時に、設定された所定速度で逆回
転する。この場合、スクリユ回転角度を常に設定
値に一致させるように制御すれば、スクリユ２の
前進に対してスクリユ２の山部の軸方向における
見掛上の移動を停止（又は著しく小さくすること
が）できる。 At this time, it is preferable that the central control unit 22 drives the metering servo motor 19 to rotate the screw 2 in a direction opposite to the direction of rotation during metering.
Thereby, the screw 2 in the injection process moves forward at a set speed and at the same time rotates backward at a set predetermined speed. In this case, if the screw rotation angle is controlled to always match the set value, the apparent movement of the crest of the screw 2 in the axial direction can be stopped (or significantly reduced) with respect to the forward movement of the screw 2. can.
一方、スクリユ２が保圧切換位置まで移動する
と保圧制御が行われ、所定時間が経過すると、各
サーボモータ１９，３４の各制御信号がOFFと
なり、射出工程は全て終了する。 On the other hand, when the screw 2 moves to the pressure holding switching position, pressure holding control is performed, and after a predetermined time has elapsed, each control signal for each servo motor 19, 34 is turned OFF, and the entire injection process is completed.
第３図中Ｐ１，Ｐ２，Ｐ３で示す実線は本発明
に係る制御方法を用いた射出工程における時間対
射出圧力の実測値を示す。前述した従来例の実測
値を示すR1〜R3の対比から明らかなように、バ
ラつきはほとんどなく、また、射出圧力の絶対値
が全体に減少し、大幅な改善効果を得た。 In FIG. 3, solid lines indicated by P1, P2, and P3 indicate actual measured values of injection pressure versus time in the injection process using the control method according to the present invention. As is clear from the comparison of R1 to R3 showing the actual measured values of the conventional example mentioned above, there was almost no variation, and the absolute value of the injection pressure decreased overall, resulting in a significant improvement effect.
以上、実施例について詳細に説明したが、本発
明はこのような実施例に限定されるものでない。
例えば、実施例ではスクリユ回転角度を検出する
手段としてアブソリユートエンコーダを利用した
が、その他、リミツトスイツチ、近接スイツチ、
インクリメンタルエンコーダ等を利用してもよ
い。また、電動式射出成形機の場合を示したが、
射出圧力の検出を射出シリンダ内の油圧を油圧セ
ンサにより検出して制御が行われる油圧式射出成
形機であつても勿論よい。その他、構成、手法等
において、本発明の要旨を逸脱しない範囲で任意
に変更実施できる。 Although the embodiments have been described in detail above, the present invention is not limited to these embodiments.
For example, in the embodiment, an absolute encoder was used as a means for detecting the screw rotation angle, but other means such as a limit switch, a proximity switch,
An incremental encoder or the like may also be used. In addition, although the case of an electric injection molding machine was shown,
Of course, it is also possible to use a hydraulic injection molding machine which is controlled by detecting the injection pressure by detecting the oil pressure in the injection cylinder using a hydraulic pressure sensor. Other changes may be made in the configuration, method, etc., without departing from the gist of the present invention.
このように、本発明に係る射出成形機の制御方
法は、射出開始位置におけるスクリユの山部（溝
部）の位置を加熱筒に対し同一位置となるように
成形サイクル毎に制御するようにしたため、次の
ような効果を得る。
As described above, in the injection molding machine control method according to the present invention, the position of the crest (groove) of the screw at the injection start position is controlled at the same position with respect to the heating cylinder for each molding cycle. Obtain the following effects.
成形材料がスクリユと材料供給路（ホツパ）
に挟まれて剪断される影響が各サイクル毎に同
じとなり、成形品質の均一化と安定化を図れ
る。また射出保圧制御を高精度に行えるため、
高品質の成形品を得ることができる。 The molding material is passed through the screw and material supply path (hopper).
The effect of being sheared by being sandwiched between them is the same for each cycle, making it possible to make the molding quality uniform and stable. In addition, injection holding pressure control can be performed with high precision.
High quality molded products can be obtained.
成形材料に基づくスクリユと加熱筒内壁間の
抵抗に対し、成形サイクル毎のバラつきを小さ
くできるため、油圧センサあるいはロードセル
による間接的圧力検出方法でも、キヤビテイ内
部の樹脂圧力と略一致する正確で高精度の圧力
検出を行うことができる。 Due to the resistance between the screw and the inner wall of the heating cylinder, which is based on the molding material, variations in each molding cycle can be reduced, so even indirect pressure detection using a hydraulic sensor or load cell can be accurate and highly accurate, almost matching the resin pressure inside the cavity. can perform pressure detection.
射出時において、スクリユを逆転させる制御
を併用すれば、理想的な超精密成形、超高品質
成形を行うことができる。 If control is also used to reverse the screw during injection, ideal ultra-precision molding and ultra-high quality molding can be achieved.
第１図：本発明に係る制御方法を実施できる射
出成形機における射出装置の模式的ブロツク回路
図、第２図：同射出装置におけるホツパ付近を模
式的に示す平面図、第３図：本発明方法によつて
制御した射出工程における時間対射出圧力の実測
図、第４図：背景技術の問題点を説明する射出装
置におけるホツパ付近の縦断面図、第５図：背景
技術の問題点説明用の射出装置を空打ちした際の
射出圧力の実測図。
尚図面中、２：スクリユ、３：加熱筒、Ｈ：加
熱筒の所定位置、Ｍ：山部の位置。
Figure 1: A schematic block circuit diagram of an injection device in an injection molding machine that can implement the control method according to the present invention, Figure 2: A plan view schematically showing the vicinity of the hopper in the injection machine, Figure 3: The present invention Fig. 4: A longitudinal cross-sectional view of the vicinity of the hopper in an injection device for explaining the problems of the background art; Fig. 5: For explaining the problems of the background art. Fig. 3 is an actual measurement diagram of the injection pressure when the injection device is blankly fired. In the drawings, 2: screw, 3: heating cylinder, H: predetermined position of heating cylinder, M: position of peak.
Claims (1)
において、射出開始位置におけるスクリユの山部
（溝部）の位置（回転方向位置）を加熱筒に対し
同一位置となるように成形サイクル毎に制御する
ことを特徴とする射出成形機の制御方法。 ２ 計量終了後に、スクリユを進退方向に固定す
るとともに、スクリユを計量時の回転方向に対し
逆方向へ回転させ、スクリユの回転角度の実測値
と予め設定した設定値を一致させるように制御す
ることを特徴とする請求項１記載の射出成形機の
制御方法。 ３ 計量工程中に、スクリユが所定位置に達し、
かつスクリユの回転角度の実測値が予め設定した
設定値に達したらスクリユの回転を停止して計量
工程を終了するように制御することを特徴とする
請求項１記載の射出成形機の制御方法。 ４ インラインスクリユ式射出成形機の制御方法
において、射出開始位置におけるスクリユの山部
（溝部）の位置（回転方向位置）を加熱筒に対し
同一位置となるように成形サイクル毎に制御する
とともに、射出時に、スクリユを計量時の回転方
向に対し逆方向へ所定速度で回転させることを特
徴とする射出成形機の制御方法。[Claims] 1. In a method for controlling an in-line screw type injection molding machine, the molding cycle is performed so that the position (rotational direction position) of the crest (groove) of the screw at the injection start position is the same with respect to the heating cylinder. A method for controlling an injection molding machine, characterized by controlling the injection molding machine at each time. 2. After the measurement is completed, the screw is fixed in the advancing and retracting direction, and the screw is rotated in the opposite direction to the rotation direction at the time of measurement, and the screw is controlled so that the actual value of the rotation angle of the screw coincides with the preset setting value. The method for controlling an injection molding machine according to claim 1, characterized in that: 3 During the weighing process, when the screw reaches the specified position,
2. The method of controlling an injection molding machine according to claim 1, further comprising the step of controlling the rotation of the screw to be stopped and the measuring step to be completed when the actual value of the rotation angle of the screw reaches a preset value. 4. In a control method for an in-line screw type injection molding machine, the position (rotational direction position) of the crest (groove) of the screw at the injection start position is controlled at the same position with respect to the heating cylinder for each molding cycle, and A method for controlling an injection molding machine, which comprises rotating a screw at a predetermined speed in a direction opposite to the direction of rotation during metering during injection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7994388A JPH01249420A (en) | 1988-03-31 | 1988-03-31 | Method for controlling injection molder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7994388A JPH01249420A (en) | 1988-03-31 | 1988-03-31 | Method for controlling injection molder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01249420A JPH01249420A (en) | 1989-10-04 |
| JPH0464497B2 true JPH0464497B2 (en) | 1992-10-15 |
Family
ID=13704394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7994388A Granted JPH01249420A (en) | 1988-03-31 | 1988-03-31 | Method for controlling injection molder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01249420A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4658908B2 (en) * | 2006-11-29 | 2011-03-23 | 日精樹脂工業株式会社 | Control method of injection molding machine |
| JP4704321B2 (en) * | 2006-11-29 | 2011-06-15 | 日精樹脂工業株式会社 | Screw angle setting method for injection molding machine |
| JP2008143022A (en) * | 2006-12-11 | 2008-06-26 | Meiki Co Ltd | Injection device and operating method thereof |
| JP5466486B2 (en) * | 2009-11-13 | 2014-04-09 | 日精樹脂工業株式会社 | Molding method for injection molding machine |
-
1988
- 1988-03-31 JP JP7994388A patent/JPH01249420A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01249420A (en) | 1989-10-04 |
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