JPH01108018A - Control of injection molding machine - Google Patents
Control of injection molding machineInfo
- Publication number
- JPH01108018A JPH01108018A JP26730687A JP26730687A JPH01108018A JP H01108018 A JPH01108018 A JP H01108018A JP 26730687 A JP26730687 A JP 26730687A JP 26730687 A JP26730687 A JP 26730687A JP H01108018 A JPH01108018 A JP H01108018A
- Authority
- JP
- Japan
- Prior art keywords
- screw
- cylinder
- injection
- nozzle valve
- resin
- 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.)
- Pending
Links
- 238000001746 injection moulding Methods 0.000 title claims description 9
- 239000011347 resin Substances 0.000 claims abstract description 22
- 229920005989 resin Polymers 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 230000001133 acceleration Effects 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 10
- 230000006835 compression Effects 0.000 claims abstract description 9
- 238000007906 compression Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000010720 hydraulic oil Substances 0.000 claims description 9
- 230000000694 effects Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- -1 compression pressure Polymers 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
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改良に関するものである。[Detailed description of the invention] “Industrial fields of application: The present invention relates to improvements in injection molding machines.
従来の技術とその問題点:
本発明の対象とする射出成形機は従来普通に使用されて
いる形式、具体的に述べると第1図に示した形式のもの
の1つである。図中射出シリンダ(1)は作動油源(2
)から供給される作動油により、ピストンロッド(3)
を、図の左方に押圧する。ピストンロッド(3)の左方
先端にスクリュ(4)が同軸に繋がり、スクリュー(4
)は、シリンダ(5)内壁に遊接し、駆動機(6)によ
り、原料ホッパ(7)から供給されるプラスチック粉を
、図の左方に移動させるように回転する。シリンダ(5
)内の材料樹脂は、包囲する加熱器(8)により加熱さ
れて溶融状態になっている。BACKGROUND ART AND PROBLEMS: The injection molding machine to which the present invention is directed is of a conventionally commonly used type, specifically one of the types shown in FIG. In the figure, the injection cylinder (1) is the hydraulic oil source (2
), the piston rod (3)
Press to the left of the figure. A screw (4) is coaxially connected to the left end of the piston rod (3), and the screw (4)
) is in loose contact with the inner wall of the cylinder (5), and is rotated by a driver (6) so as to move the plastic powder supplied from the raw material hopper (7) to the left in the figure. Cylinder (5
) is heated to a molten state by the surrounding heater (8).
ノズルパルプ(9)は、シリンダ(5)と金型(図示せ
ず)との連絡を司るパルプで、これが閉じているかぎり
、溶融樹脂は金型に供給されない。The nozzle pulp (9) is a pulp that controls communication between the cylinder (5) and the mold (not shown), and as long as this is closed, molten resin is not supplied to the mold.
上記した形式の射出成形機で、ノズルバルブ(9)を閉
じたままでスクリュ(4)を回転させると、そのコンベ
ヤ作用で、スクリュ(4)の前方(図上左方)の空所に
溶融プラスチックが溜シ、さらにスクリュ(4)が後退
して、シリンダ(5)内に溶融プラスチックが充填され
ていく。スクリュ(4)の前方に溜まった溶融プラスチ
ックが右方に漏洩しないように、通常、逆止パルプαQ
が設置しである。シリンダ(5)内に必要な溶融樹脂が
溜まると、ノズルバルブ(9)を開いて金型内に溶融樹
脂を押し出す。しかしながら、スクリュ(4)の前方空
所に、溜った樹脂の圧力が充分高くなっていないと、こ
の樹脂が、図の右方スクリュ側に漏出して、樹脂の一部
が、成形型の方へ送出されないことになる。In the injection molding machine of the above type, when the screw (4) is rotated with the nozzle valve (9) closed, the conveyor action causes the molten plastic to melt in the empty space in front of the screw (4) (to the left in the figure). Then, the screw (4) retreats further and the cylinder (5) is filled with molten plastic. To prevent the molten plastic that has accumulated in front of the screw (4) from leaking to the right, check pulp αQ is usually used.
is installed. When the necessary molten resin has accumulated in the cylinder (5), the nozzle valve (9) is opened to push out the molten resin into the mold. However, if the pressure of the resin accumulated in the space in front of the screw (4) is not high enough, this resin will leak to the right side of the screw in the figure, and some of the resin will be directed toward the mold. It will not be sent to.
このことを避けるために、例えば、特開昭52−151
352号公報では、スクリュが右方に後退した位置を基
準位置とせずに、スクリュを左方に移動させ、材料圧が
、所要一定値になったときのスクリュの位置を基準位置
として、射出工程における射出圧や射出スピード等を制
御する方法を提案している。In order to avoid this, for example, JP-A-52-151
In Publication No. 352, instead of using the position where the screw retreated to the right as the reference position, the screw is moved to the left and the position of the screw when the material pressure reaches a required constant value is used as the reference position, and the injection process is started. We are proposing a method to control injection pressure, injection speed, etc.
しかしながら、この方法では、上記材料圧が、所要一定
値になるまでの時間が、樹脂の種類、圧縮する圧力、圧
縮される樹脂容積、温度などにより異なるから、安定し
て停止するまでの時間を設定するタイマーが固定である
場合には、充分長い時間を設定しておく必要がある。そ
れゆえ、圧縮後停止までの時間が短い条件で成形を行う
場合には、無駄時間を生じるため、成形操作のサイクル
が長くなり、生産効率が悪くなる。However, with this method, the time it takes for the material pressure to reach the required constant value varies depending on the type of resin, compression pressure, resin volume to be compressed, temperature, etc., so it takes a long time to stabilize and stop. If the timer to be set is fixed, it is necessary to set a sufficiently long time. Therefore, when molding is performed under conditions where the time from compression to stop is short, wasted time occurs, the molding operation cycle becomes longer, and production efficiency deteriorates.
また、特開昭51−78568号公報の記載の方法では
、樹脂圧縮途中、スクリュが前進している間に、油圧が
所定値に達する場合(たとえば溶融樹脂粘度が高い場合
には、油圧が所定値に達しながらもスクリュが前進する
。)もあり、この状態で′は、溶融樹脂が充分に安定し
て圧縮された状態であるかを知ることは不可能である。Furthermore, in the method described in JP-A-51-78568, if the oil pressure reaches a predetermined value while the screw is moving forward during resin compression (for example, when the viscosity of the molten resin is high), the oil pressure may reach a predetermined value. ), and in this state it is impossible to know whether the molten resin is compressed in a sufficiently stable manner.
問題点を解決する手段:
本発明では、第1図のノズルバルブ(9)を開く前に、
スクリュ(4)を押して、スクリュ先端の溶融樹脂を所
定圧まで予備圧縮する。そして、予備圧縮の際の加速度
を検出して、該加速度が、所定値以下になった時点で、
ノズルバルブを開いて射出を開始する。Means for solving the problem: In the present invention, before opening the nozzle valve (9) in FIG.
Push the screw (4) to pre-compress the molten resin at the tip of the screw to a predetermined pressure. Then, when the acceleration during preliminary compression is detected and the acceleration becomes equal to or less than a predetermined value,
Open the nozzle valve and start injection.
すなわち、本発明は、
先端にノズルバルブ(9)を有するシリンダ(5)と;
シリンダ(5)内で、軸方向移動および軸まわり回転自
在に透液するスクリュ(4)と;材料樹脂を収納し、ス
クリュ(4)により、該材料樹脂をシリンダ(5)内、
スクリュ(4)の前方に輸送可能な位置で、シリンダ(
5)に側設されたホッパ(7)と;スクリュ(4)を、
ノズルバルブ(9)側に押圧前進させ、かつ後退自在の
射出シリンダ(1)と;スクリュ(4)を回転させる駆
動機(6)と;シリンダ(5)を加熱する加熱器(8)
;とを含み、射出シリンダ(1)に作動油源から作動油
を供給して、スクリュ(4)を、シリンダ(5)の軸方
向に駆動する射出成形機において:
スクリュ(4)が、回転しつつ、射出シリンダ(1)側
に後退して、ホッパ(7)から供給された材料樹脂を、
その前端空所に充填した後、ノズルバルブ(1)側に前
進して、材料樹脂を予備圧縮して、射出シリンダ(1)
内の圧力が定圧まで上昇し、スクリュ(4)の前進が減
速し加速度が一定負値になったときに、前記ノズルバル
ブ(9)を開く;
ことを特徴とする射出成形機の制御方法である。That is, the present invention includes: a cylinder (5) having a nozzle valve (9) at its tip;
A screw (4) that allows liquid to pass through the cylinder (5) so as to be able to move in the axial direction and rotate around the axis;
In a transportable position in front of the screw (4), the cylinder (
5) and the screw (4) installed on the side.
An injection cylinder (1) that is pushed forward toward the nozzle valve (9) and can be retracted freely; A driver (6) that rotates the screw (4); A heater (8) that heats the cylinder (5)
; In an injection molding machine that supplies hydraulic oil from a hydraulic oil source to the injection cylinder (1) and drives the screw (4) in the axial direction of the cylinder (5): The screw (4) rotates. At the same time, it retreats to the injection cylinder (1) side, and the material resin supplied from the hopper (7) is
After filling the front end cavity, move forward to the nozzle valve (1) side, pre-compress the material resin, and press the injection cylinder (1).
The nozzle valve (9) is opened when the internal pressure increases to a constant pressure, the forward movement of the screw (4) decelerates, and the acceleration reaches a constant negative value. be.
発明の作用:
第2図において、(イ)図は、横軸に時刻、縦軸に、射
出シリンダー押圧力、(ロ)図は横軸に時刻、縦軸にス
クリュ移動速度、(ハ)図は横軸に時刻、縦軸にスクリ
ュ移動加速度を示したもので、横軸の時刻目盛は、(イ
)、(ロ)、(ハ)図共通とする。Effect of the invention: In Fig. 2, (A) shows time on the horizontal axis, injection cylinder pressing force on the vertical axis, (B) shows time on the horizontal axis, screw movement speed on the vertical axis, and (C) shows time on the horizontal axis. The horizontal axis shows time and the vertical axis shows screw movement acceleration, and the time scale on the horizontal axis is the same in Figures (A), (B), and (C).
射出シリンダに働く作動油の圧力は、スクリュが前方に
移動している間は、作動油のシリンダへの供給が遅れる
ので、この期間のシリンダ内の油圧力は、(イ)図のa
l、b1間のように除徐に増加する。この期間中にスク
リュは、第1図の、左方に若干前進する(予備圧縮期間
という。)。この予備圧縮期間中の、スクリュ(4)が
第1図右側へ後退移動中に、ホッパ(7)からシリンダ
(5)内に供給されていた材料が、圧縮を受けて縮小す
ると同時に昇圧する。同じ期間内の、スクリュの移動速
度は、(ロ)図のようになる。そこで、この期間中のス
クリュ移動の加速度はを9図のようになる。While the screw is moving forward, the supply of hydraulic oil to the cylinder is delayed, so the hydraulic pressure in the cylinder during this period is as shown in (a) a in the figure.
It increases gradually between l and b1. During this period, the screw advances slightly to the left in FIG. 1 (referred to as the pre-compression period). During this pre-compression period, while the screw (4) is moving backward to the right in FIG. 1, the material being supplied from the hopper (7) into the cylinder (5) is compressed and reduced, and at the same time its pressure increases. The moving speed of the screw during the same period is as shown in figure (b). Therefore, the acceleration of screw movement during this period is as shown in Figure 9.
本発明では、(ハ)図めb8点を検知して、点線I−■
の時点でノズル弁を開くのであって、従来法では、点線
1−1と、点線■−■との間隔で示される無駄時間が存
在していたのである。In the present invention, (c) 8 points of figure b are detected, and the dotted line I-■
The nozzle valve is opened at the point in time, and in the conventional method, there was a dead time shown by the interval between the dotted line 1-1 and the dotted line 1-1.
実施例:
第1図において、スクリュ(4)とピストンロッド(3
)とは固着しているので、ピストンロッド(3)の適宜
位置に、ラックギヤ(11a)を具えた突出体αDを固
定し、ラックギヤ(lla)に、ピニオン@を噛合させ
、スクリュ(4)の移動を、ビニオン@の回転に変換す
る。ピニオン(2)の回転を微分器(至)により微分し
て、微分値が一定の負数になったときに、駆動機α→に
より、ノズルパルプ(9)を開くようにすることにより
、第2図(ハ)図のb3位置でノズルパルプを開く条件
が満たされる。Example: In Fig. 1, the screw (4) and the piston rod (3
), so the protruding body αD equipped with the rack gear (11a) is fixed at an appropriate position on the piston rod (3), the pinion @ is engaged with the rack gear (lla), and the screw (4) is fixed. Converts the movement into a rotation of the binion @. The rotation of the pinion (2) is differentiated by a differentiator (to), and when the differential value becomes a constant negative number, the nozzle pulp (9) is opened by the drive device (C) The condition for opening the nozzle pulp is satisfied at position b3 in the figure.
射出が終わると、ノズルパルプ(9)を閉じ、射出シリ
ンダーに働く作動油の圧を解放し、スクリュ(4)を回
転させて、ホッパ(7)から、材料樹脂を、シリンダ(
5)内に、供給する。しかしながら、これらの周知操作
の詳細な説明は省略する。When the injection is finished, the nozzle pulp (9) is closed, the pressure of the hydraulic oil acting on the injection cylinder is released, the screw (4) is rotated, and the material resin is transferred from the hopper (7) into the cylinder (
5) Supply within. However, a detailed explanation of these well-known operations will be omitted.
なお、スクリュ加速度の検出には、ここに挙げた例の他
、加速度計を直接用いることもできる。In addition to the examples given here, an accelerometer can also be used directly to detect the screw acceleration.
発明の効果:
本発明では、スクリュ(4)による予備圧縮の際に、シ
リンダ(5)内の溶融樹脂が充分圧縮され、スクリュ(
4)の前進が、もはや困難となる時点を、作動油に押圧
されるスクリュ(4)の移動加速度の形で把握し、該加
速度が、所定の負値に達すると、ノズルパルプ(9)を
開くように構成されているから、無駄時間をなくするこ
とができ、射出成形機としての生産性を増す。Effects of the invention: In the present invention, during preliminary compression by the screw (4), the molten resin in the cylinder (5) is sufficiently compressed, and the screw (4)
The point at which the advance of step 4) becomes difficult is determined by the movement acceleration of the screw (4) pressed by the hydraulic oil, and when the acceleration reaches a predetermined negative value, the nozzle pulp (9) is moved. Since it is configured to open, it is possible to eliminate wasted time and increase productivity as an injection molding machine.
第1図は、本発明の改良となる射出成形機の1例に、本
発明の制御方法を適用した態様を示す断面説明図である
0
第2図は、(イ)、(ロ)、(ハ)の3図からなり、そ
れぞれ、パワーシリンダ内の作動油圧力の経時質イし、
スクリュ移動速度の経時変化、スクリュ移動加速度の経
時変化を示す。FIG. 1 is a cross-sectional explanatory view showing an embodiment in which the control method of the present invention is applied to an example of an injection molding machine that is an improvement of the present invention. FIG. 2 shows (a), (b), ( It consists of three diagrams (c), each showing the change over time of the hydraulic oil pressure in the power cylinder, and
It shows changes over time in screw movement speed and changes over time in screw movement acceleration.
Claims (1)
と;シリンダ(5)内で、軸方向移動および軸まわり回
転自在に遊接するスクリュ(4)と;材料樹脂を収納し
、スクリュ(4)により、該材料樹脂を、シリダ(5)
内、スクリュ(4)の前方に輸送可能な位置で、シリン
ダ(5)に側設されたホッパ(7)と;スクリュ(4)
を、ノズルバルブ(9)側に押圧前進させ、かつ後退自
在の射出シリンダ(1)と;スクリュ(4)を回転させ
る駆動機(6)と;シリンダ(5)を加熱する加熱器(
8);とを含み、射出シリンダ(1)に作動油源から作
動油を供給して、スクリュ(4)を、シリンダ(5)の
軸方向に駆動する射出成形機において: スクリュ(4)が、回転しつつ、射出シリンダ(1)側
に後退して、ホッパ(7)から供給された樹脂を、その
前端空部に充填した後、ノズルパルプ(9)側に前進し
て、材料樹脂を予備圧縮して、射出シリンダ(1)内の
圧力が定圧まで上昇し、スクリュ(4)の前進が減速し
、加速度が一定負値になつたときに、前記ノズルバルブ
(9)を開く; ことを特徴とする射出成形機の制御方法。[Claims] 1. A cylinder (5) having a nozzle valve (9) at its tip.
and a screw (4) that is in loose contact within the cylinder (5) so as to be able to move in the axial direction and rotate around the axis; and a material resin is stored therein, and the material resin is transferred to the cylinder (5) by the screw (4).
Inside, a hopper (7) installed on the side of the cylinder (5) at a position where it can be transported in front of the screw (4);
an injection cylinder (1) that presses the cylinder forward toward the nozzle valve (9) and is freely retractable; a driver (6) that rotates the screw (4); and a heater (5) that heats the cylinder (5).
8); In an injection molding machine that supplies hydraulic oil from a hydraulic oil source to the injection cylinder (1) and drives the screw (4) in the axial direction of the cylinder (5): the screw (4) is , while rotating, retreats toward the injection cylinder (1) side and fills the front end cavity with the resin supplied from the hopper (7), then advances toward the nozzle pulp (9) side and fills the resin material. Opening the nozzle valve (9) when the pressure in the injection cylinder (1) increases to a constant pressure after pre-compression, the advancement of the screw (4) decelerates, and the acceleration reaches a constant negative value; A control method for an injection molding machine characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26730687A JPH01108018A (en) | 1987-10-21 | 1987-10-21 | Control of injection molding machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26730687A JPH01108018A (en) | 1987-10-21 | 1987-10-21 | Control of injection molding machine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01108018A true JPH01108018A (en) | 1989-04-25 |
Family
ID=17442997
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP26730687A Pending JPH01108018A (en) | 1987-10-21 | 1987-10-21 | Control of injection molding machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01108018A (en) |
-
1987
- 1987-10-21 JP JP26730687A patent/JPH01108018A/en active Pending
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