JP2948620B2 - Metering control method for pre-plastic injection molding machine - Google Patents
Metering control method for pre-plastic injection molding machineInfo
- Publication number
- JP2948620B2 JP2948620B2 JP2128450A JP12845090A JP2948620B2 JP 2948620 B2 JP2948620 B2 JP 2948620B2 JP 2128450 A JP2128450 A JP 2128450A JP 12845090 A JP12845090 A JP 12845090A JP 2948620 B2 JP2948620 B2 JP 2948620B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- pressure
- storage space
- plunger
- injection
- 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 - Fee Related
Links
- 238000000034 method Methods 0.000 title claims description 20
- 238000001746 injection moulding Methods 0.000 title claims description 19
- 239000011347 resin Substances 0.000 claims description 62
- 229920005989 resin Polymers 0.000 claims description 62
- 238000002347 injection Methods 0.000 claims description 33
- 239000007924 injection Substances 0.000 claims description 33
- 238000005303 weighing Methods 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
- B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
- B29C45/544—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw the plasticising unit being connected to a transfer chamber in the injection unit at the upstream side of the injection piston
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- 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、予め可塑化した樹脂をプランジャーで金型
内に注入するプリプラ式射出成形機における計量制御方
法に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metering control method in a pre-plastic injection molding machine in which a plasticized resin is injected into a mold with a plunger.
従来の技術 従来のプリプラ式射出成形機における計量制御方法の
例を第５図及び第６図によって説明する。2. Description of the Related Art An example of a metering control method in a conventional pre-plastic injection molding machine will be described with reference to FIGS.
第５図は射出成形機のシリンダ部の断面図である。射
出成形機の全体図は省略したが、射出シリンダ内でプラ
ンジャーと係合した逆流防止弁により貯溜空間を（ａ）
と（ｂ）とし、可塑化した樹脂をスクリューにより前記
貯溜空間（ａ）に注入し、プランジャーで前記貯溜空間
（ｂ）内の樹脂を金型内に注入して射出成形する。従来
例では（イ）に示すように射出工程でシリンダ24内のプ
ランジャー25をモータによりＡ方向に移動させ、それに
より樹脂貯溜空間（ａ）26の樹脂圧力P1が、樹脂貯溜空
間（ｂ）27の樹脂圧力P2より高くなり、この圧力差によ
り逆流防止弁28は、射出プランジャー25に密着し、圧力
P1を高めることにより金型内に樹脂を注入する。そし
て、保圧工程においては金型に注入された樹脂を一定圧
力で押し続ける。その後、射出プランジャー25の押圧力
を０にし、樹脂圧力P1を下げる。そして、可塑化スクリ
ュー（図示していない）を回転させ、スクリュー先端か
ら樹脂をシリンダ24内の貯溜空間（ｂ）27に送り込み、
樹脂圧力P2を高め、逆流防止弁25を貯溜空間（ａ）26側
に押しやり、これにより発生した間隙を通して貯溜空間
（ａ）26側に樹脂を送り込む。この時（ロ）に示すよう
に樹脂圧力P1が一定の圧力になるように射出プランジャ
ー25をＢの方向に移動させて、貯溜空間（ｂ）27に樹脂
を送り込んでいる。FIG. 5 is a sectional view of a cylinder portion of the injection molding machine. Although the overall view of the injection molding machine is omitted, the storage space is defined by a check valve which is engaged with the plunger in the injection cylinder to form the storage space (a).
And (b), the plasticized resin is injected into the storage space (a) by a screw, and the resin in the storage space (b) is injected into a mold with a plunger to perform injection molding. In the prior art moves the plunger 25 in the cylinder 24 in the A direction by the motor in the injection step, as shown in (b), whereby the resin pressure P 1 of the resin reservoir space (a) 26 is a resin reservoir space (b ) The resin pressure P 2 becomes higher than 27, and this pressure difference causes the check valve 28 to come into close contact with the injection plunger 25,
Injecting a resin into the mold by increasing the P 1. Then, in the pressure-holding step, the resin injected into the mold is kept pressed at a constant pressure. Thereafter, the pressing force of the injection plunger 25 to 0, reducing the resin pressure P 1. Then, a plasticizing screw (not shown) is rotated, and the resin is fed into the storage space (b) 27 in the cylinder 24 from the screw tip,
Increasing the resin pressure P 2, the check valve 25 pushes the reservoir space (a) 26 side, feeding the resin to the reservoir space (a) 26 side through the gap generated thereby. At this time, the injection plunger 25 so that the resin pressure P 1 is kept constant pressure by moving in the direction of B as shown in (b), which is fed into the resin reservoir space (b) 27.
発明が解決しようとする課題 しかし、上記のような従来例では射出工程において、
プランジャー25の移動により樹脂圧力P2が0kg/cm2より
小さくなり、スクリュー先端部の樹脂を巻き込むため、
計量が不安定になったり、シリンダ24と射出プランジャ
ー25との間隙から空気を巻き込むことにより成形品に気
泡が発生する原因となる。However, in the above conventional example, in the injection process,
The movement of the plunger 25 resin pressure P 2 is smaller than 0 kg / cm 2, for involving the resin at the tip of the screw,
The measurement becomes unstable, and air is generated from the gap between the cylinder 24 and the injection plunger 25, which causes air bubbles in the molded product.
また、第６図（イ）（ロ）（ハ）（ニ）に示すように
射出工程（ｉ）、保圧工程（Ｐ）、計量工程（Ｍ）を順
次行うため、成形サイクルが長くなるという問題点があ
った。Also, as shown in FIGS. 6 (a), (b), (c), and (d), the injection step (i), the pressure-holding step (P), and the measuring step (M) are sequentially performed, so that the molding cycle becomes longer. There was a problem.
本発明の目的は上記のような従来の問題点に鑑み、射
出工程内の可塑化スクリューからの樹脂の巻き込みや、
シリンダとプランジャーとの間隙からの空気の巻き込み
がなく、成形サイクルの短縮が実現できる計量制御方法
を提供しようとするものである。The object of the present invention, in view of the conventional problems as described above, and the winding of resin from the plasticizing screw in the injection process,
It is an object of the present invention to provide a metering control method that does not involve air from a gap between a cylinder and a plunger and can shorten a molding cycle.
課題を解決するための手段 本発明は上記目的を達成するため、第１の発明では、
射出シリンダ内でプランジャーと係合した逆流防止弁に
より貯溜空間を（ａ）と（ｂ）とし、予め可塑化した樹
脂をスクリューにより前記貯溜空間（ｂ）に注入し、プ
ランジャーで前記貯溜空間（ａ）内の樹脂を金型内に射
出するプリプラ式射出成形機において、樹脂を金型内に
注入する射出工程では射出速度に比例した回転数により
計量し、さらに注入された樹脂を一定の圧力で押圧する
保圧工程では一定の回転数で計量することにより、射出
工程と保圧工程とを通して樹脂の計量を同時に行うよう
制御したプリプラ式射出成形機の計量制御方法とし、第
２の発明では、射出シリンダ内でプランジャーと係合し
た逆流防止弁により貯溜空間を（ａ）と（ｂ）とし、予
め可塑化した樹脂をスクリューにより前記貯溜空間
（ｂ）に注入し、プランジャーで前記貯溜空間（ａ）内
の樹脂を金型内に射出するプリプラ式射出成形機におい
て、前記貯溜空間の（ａ）と（ｂ）間の圧力差を可塑化
スクリューの回転数にフィードバックし、前記圧力差が
常に一定になるように制御して計量を行うプリプラ式射
出成形機の計量制御方法とした。Means for Solving the Problems In order to achieve the above object, the present invention provides, in the first invention,
The storage space is set to (a) and (b) by a check valve engaged with the plunger in the injection cylinder, and a pre-plasticized resin is injected into the storage space (b) by a screw, and the storage space is set by the plunger. (A) In a pre-plasticization type injection molding machine for injecting the resin into a mold, in an injection step of injecting the resin into the mold, the resin is measured by a rotation speed proportional to the injection speed, and the injected resin is further fixed. In a pressure-holding step in which pressure is applied, a metering control method for a pre-plastic injection molding machine is provided in which the resin is metered simultaneously through the injection step and the pressure-holding step by measuring at a constant number of revolutions. Then, the storage space is changed to (a) and (b) by a check valve engaged with a plunger in the injection cylinder, and a resin plasticized in advance is injected into the storage space (b) by a screw. In a pre-plastic injection molding machine in which the resin in the storage space (a) is injected into a mold by a jar, the pressure difference between (a) and (b) in the storage space is fed back to the rotation speed of the plasticizing screw. A weighing control method for a pre-plastic injection molding machine that performs weighing by controlling the pressure difference to be always constant.
作用 本発明は上記のような構成をとったので、第１発明で
は射出工程中及び保圧工程中にも可塑化スクリューによ
って樹脂を注入し続けているので、シリンダの貯溜空間
内の樹脂圧力P2を0kg/cm2以上の圧力に保つことがで
き、可塑化スクリュー先端からの樹脂の巻き込みを防止
し、また、シリンダとプランジャーとの間隙からの空気
の巻き込みを防止でき、射出工程と保圧工程とを通して
樹脂をシリンダ内に供給しているため、常に計量すると
共に計量工程における樹脂の供給量を減少させることが
できる。Operation Since the present invention has the above configuration, in the first invention, the resin is continuously injected by the plasticizing screw during the injection step and the pressure-holding step, so that the resin pressure P in the storage space of the cylinder is maintained. 2 can be maintained at a pressure of 0 kg / cm 2 or more, preventing the resin from getting in from the tip of the plasticizing screw and preventing the air from getting in from the gap between the cylinder and the plunger. Since the resin is supplied into the cylinder through the pressure step, it is possible to constantly measure and reduce the supply amount of the resin in the measuring step.
また、第２発明では射出工程及び保圧工程中に逆流防
止弁を境とした貯溜空間（ａ）（ｂ）間の圧力差を可塑
化スクリューの回転速度にフィードバックして、圧力差
を一定に保つようになっている。In the second invention, the pressure difference between the storage spaces (a) and (b) bordering on the check valve is fed back to the rotation speed of the plasticizing screw during the injection step and the pressure-holding step, thereby keeping the pressure difference constant. To keep it.
実施例 以下、本発明の一実施例であるプリプラ式射出成形機
の計量制御方法を図面に基づいて説明する。Hereinafter, a weighing control method for a prepra-type injection molding machine according to an embodiment of the present invention will be described with reference to the drawings.
第１図において、１はプリプラ式射出成形機のシリン
ダで、その内部に前後動可能なプランジャー２が配設さ
れている。このプランジャー２の後部には、連結部材３
を介してボールネジナット４が固定されている。このボ
ールネジナット４はガイド５により回転しないようにガ
イドされる。６はサーボモータで、回転駆動可能なボー
ルネジ７が前記ボールネジナット４に螺合している。プ
ランジャー２の先端部には、円錐体状のプランジャーヘ
ッド８が設けられ、その後部に前後動可能な逆流防止弁
９が配置され、シリンダ１内を前方の貯溜空間（ａ）10
と後方の貯溜空間（ｂ）12に分けている。貯溜空間10の
前部には金型内のキャビティに樹脂を注入するノズル11
が形成されている。13は可塑化シリンダで、その内部に
回転可能な可塑化スクリュー14が配設され、シリンダ１
内への樹脂供給口15を有している。16はヒータで、可塑
化シリンダ13及びシリンダ１の外周部に配置されてい
る。可塑化スクリュー14の後部には、サーボモータ17が
接続され、ホッパー18から樹脂材料が供給されるように
なっている。サーボモータ17の回転により、可塑化スク
リュー14が回転し、樹脂材料は可塑化スクリュー14の回
転によるセン断熱及びヒータ16から供給された熱により
可塑化され、樹脂供給口15に送られてシリンダ１内部の
貯溜空間（ｂ）12へ供給される。In FIG. 1, reference numeral 1 denotes a cylinder of a pre-plastic injection molding machine, in which a plunger 2 which can move back and forth is disposed. At the rear of the plunger 2, a connecting member 3
, The ball screw nut 4 is fixed. The ball screw nut 4 is guided by a guide 5 so as not to rotate. Reference numeral 6 denotes a servo motor, and a ball screw 7 that can be driven to rotate is screwed to the ball screw nut 4. A conical plunger head 8 is provided at the tip of the plunger 2, and a check valve 9, which can move back and forth, is disposed at the rear of the plunger head 8.
And a rear storage space (b) 12. A nozzle 11 for injecting resin into a cavity in a mold is provided at a front portion of the storage space 10.
Are formed. Reference numeral 13 denotes a plasticizing cylinder in which a rotatable plasticizing screw 14 is disposed.
It has a resin supply port 15 to the inside. Numeral 16 denotes a heater, which is arranged on the outer periphery of the plasticizing cylinder 13 and the cylinder 1. A servomotor 17 is connected to the rear of the plasticizing screw 14 so that a resin material is supplied from a hopper 18. The rotation of the servo motor 17 rotates the plasticizing screw 14, and the resin material is plasticized by the heat insulation supplied by the rotation of the plasticizing screw 14 and the heat supplied from the heater 16, sent to the resin supply port 15, and fed to the cylinder 1. It is supplied to the internal storage space (b) 12.
19は制御装置で、前記サーボモータ６及びサーボモー
タ17の回転を制御するもので、サーボモータ６の回転軸
に結合されたエンコーダ20及びサーボモータ17の回転軸
に結合されたエンコーダ21からの信号を入力すると共に
シリンダ１の貯溜空間10に配設された樹脂圧力センサ22
及び貯溜空間12に配設された樹脂圧力センサ23からの信
号が入力されるようになっている。Reference numeral 19 denotes a control device for controlling the rotation of the servo motor 6 and the servo motor 17. Signals from an encoder 20 coupled to the rotation axis of the servo motor 6 and an encoder 21 coupled to the rotation axis of the servo motor 17 are provided. And a resin pressure sensor 22 disposed in the storage space 10 of the cylinder 1.
And a signal from a resin pressure sensor 23 disposed in the storage space 12 is input.
この制御装置19は、サーボモータ６自体の出力トル
ク、エンコーダ20により検出される位置信号から演算さ
れるプランジャー２の位置及び移動速度、圧力センサ22
により検出される貯溜空間10の樹脂圧力差が所定値とな
るようにサーボモータ６を駆動制御すると共に、サーボ
モータ17のエンコーダ21より検出される位置信号から演
算される可塑化スクリュー14の回転数あるいは圧力セン
サ22から検出される貯溜空間10の樹脂圧力P1と圧力セン
サ23から検出される貯溜空間12の樹脂圧力P2との差等
が、所定値となるようにサーボモータ17を駆動制御する
ようになっている。The control device 19 controls the output torque of the servo motor 6 itself, the position and the moving speed of the plunger 2 calculated from the position signal detected by the encoder 20, and the pressure sensor 22.
The servo motor 6 is driven and controlled so that the resin pressure difference in the storage space 10 detected by the servo motor 17 becomes a predetermined value, and the rotational speed of the plasticizing screw 14 calculated from the position signal detected by the encoder 21 of the servo motor 17 or differentially between the resin pressure P 2 of the reservoir space 12, which is detected from the resin pressure P 1 and the pressure sensor 23 of the reservoir space 10 is detected from the pressure sensor 22, drives and controls the servo motor 17 to a predetermined value It is supposed to.
次に本発明の第１の実施例の制御方法について第１図
及び第２図に基づいて説明する。射出工程（ｉ）中、複
数多段に設定された射出速度Vi1、Vi2、Vi3に対し、シ
リンダ１内の貯溜空間12の樹脂圧力P2がP2＞０となるよ
うな射出速度に比例した計量回転数Ni1、Ni2、Ni3で、
可塑化スクリュー（図示なし）を回転することにより、
射出工程中に計量（Ｍ）を行う。次に保圧工程（Ｐ）中
では、保圧終了時に貯溜空間10の樹脂圧力P1と貯溜空間
12の樹脂圧力P2との関係をP2≧P1にならないような低い
一定の回転数により可塑化スクリューを回転し、保圧工
程中にも計量（Ｍ）を行うようにした。Next, a control method according to a first embodiment of the present invention will be described with reference to FIGS. During the injection process (i), the plurality multistage injection speed is set to V i1, V i2, V i3 , the injection rate such that the resin pressure P 2 of the reservoir space 12 in the cylinder 1 is P 2> 0 With proportional metering speeds Ni1 , Ni2 , Ni3 ,
By rotating the plasticizing screw (not shown),
Metering (M) is performed during the injection process. Next, during the pressure-holding step (P), the resin pressure P 1 in the storage space 10 and the storage space
The relationship between the resin pressure P 2 of 12 plasticized screw rotated by P 2 ≧ P low, constant rotational speed, such as not to 1, even during the pressure-holding step was to perform metering (M).
保圧工程終了後、所定の回転NM1で可塑化スクリュー
を回転させ計量を行うことにより、貯溜空間10の樹脂圧
力P1が所定の圧力を保つようにプランジャー２を移動さ
せ、プランジャー２が所定の位置xMiに達すると計量回
転数（Ｎ）をNM2に切換える。そして、圧力P1を所定圧
力PM2に保つように所定の回転数NM2で可塑化スクリュー
を回転させ、プランジャー２が所定の位置x0に達すると
計量を終了する。After completion of the pressure holding process, by performing the metering rotating the plasticizing screw at a predetermined rotation N M1, the resin pressure P 1 of the reservoir space 10 moves the plunger 2 so as to maintain a predetermined pressure, the plunger 2 There switched and reaches a predetermined position x Mi metering rotational speed (N) in N M2. Then, by rotating a plasticizing screw at a predetermined rotational speed N M2 to maintain the pressure P 1 to a predetermined pressure P M2, the plunger 2 has finished measuring and reaches a predetermined position x 0.
次に本発明の第２の実施例の制御方法について、第１
図、第３図及び第４図に基づいて説明する。Next, the control method according to the second embodiment of the present invention
Explanation will be made based on FIG. 3, FIG. 3 and FIG.
射出工程（ｉ）中において、第３図（ホ）に示すよう
に圧力P1とP2との差（P1−P2）が常に一定となるように
第４図に示すような制御方式により可塑化スクリューの
回転数を制御する。すなわち、圧力P1とP2の差と、圧力
P1-2との差の比例値及び積分値の和をサーボモータ17の
回転数指令としてモータドライバに与え、サーボモータ
17の回転数を制御する。第４図に示した符号KP1は、圧
力センサーから検出された圧力P1、P2の差を制御系のト
ルク値に換算する係数であり、KP2は制御系の圧力指令
をトルク値に換算する係数である。During the injection process (i), the third diagram difference between the pressure P 1 and P 2 as shown in (e) (P 1 -P 2) is always controlled system as shown in FIG. 4 to be constant Controls the rotation speed of the plasticizing screw. That is, the difference between the pressure P 1 and P 2, the pressure
The sum of the proportional value and the integral value of the difference from P 1-2 is given to the motor driver as the rotation speed command of the servo motor 17, and the servo motor
17 rotations are controlled. Code KP1 shown in FIG. 4 is a coefficient for converting the difference between the pressure P 1, P 2 detected from the pressure sensor to a torque value of the control system, KP2 is converted to pressure command of the control system to the torque value It is a coefficient.
第５図の逆流防止弁９の前部の樹脂圧力P1と逆流防止
弁９の後部の樹脂圧力P2の差の指令値のKP2倍の値と、
実際のP1とP2の値の差のKP1の値との差、のKP倍の値及
び差の積分値のKI倍の値の和をサーボドライバの速度指
令に入力する。And KP2 times the command value for the front of the rear differential of the resin pressure P 2 of the resin pressure P 1 and the backflow prevention valve 9 of FIG. 5 of the check valve 9,
The actual difference between the value of KP1 of the difference between the values of P 1 and P 2, and inputs the sum of KI times the value of KP times the value and the difference between the integrated value of the speed command of the servo driver.
上記実施例１及び２によると、射出工程中及び保圧工
程中にも樹脂圧力P2を0kg/cm2以上の圧力に保つことが
でき、可塑化スクリュー14の先端からの樹脂の巻き込
み、またシリンダ１とプランジャー２との間隙からの空
気の巻き込みを防止できるとともに、射出工程中及び保
圧工程中においても樹脂をシリンダ１内に供給している
ため、計量工程における樹脂の供給量を減少させること
ができ、計量時間の短縮が図れ、高速成形サイクルが実
現できる。According to the above Examples 1 and 2, the resin pressure P 2 can be maintained at a pressure of 0 kg / cm 2 or more even during the injection step and the pressure holding step, and the resin is wound from the tip of the plasticizing screw 14, and Air can be prevented from being trapped in the gap between the cylinder 1 and the plunger 2, and the resin is supplied into the cylinder 1 during the injection step and the pressure-holding step. Weighing time can be reduced, and a high-speed molding cycle can be realized.
発明の効果 本発明のプリプラ式射出成形機の計量制御方法によれ
ば、上記のように第１発明及び第２発明共に射出工程中
及び保圧工程中にシリンダとプランジャーとの間隙から
の空気の巻き込みが防止でき、成形品への気泡発生の要
因が減少すると共に、可塑化スクリュー先端からの樹脂
の巻き込みも防止でき、計量の安定性が向上し、成形品
の密度が高く、重量及び寸法バラツキも少なくなる。さ
らに射出工程中及び保圧工程中においても樹脂をシリン
ダ内に供給しているため、計量工程における樹脂の供給
量を減少させることができるので、樹脂の可塑化能力の
向上がはかれ、高速成形サイクルが実現できる等優れた
効果がある。According to the metering control method for the pre-plastic injection molding machine of the present invention, as described above, air from the gap between the cylinder and the plunger during both the injection step and the pressure-holding step in both the first invention and the second invention. Can be prevented, the cause of air bubble generation in the molded product can be reduced, and the resin can be prevented from being entangled from the tip of the plasticizing screw, the measurement stability is improved, the density of the molded product is high, and the weight and dimensions are high. Variations are reduced. Further, since the resin is supplied into the cylinder also during the injection step and the pressure holding step, the amount of the resin supplied in the measuring step can be reduced, so that the plasticizing ability of the resin is improved and the high-speed molding is performed. There are excellent effects such as realization of a cycle.
第１図は本発明の実プリプラ式射出成形機の要部断面
図、第２図（イ）（ロ）（ハ）（ニ）（ホ）は、第１の
実施例における射出工程、保圧工程及び計量のタイミン
グチャート図、第３図（イ）（ロ）（ハ）（ニ）（ホ）
（ヘ）は第２の実施例を示す工程と計量のタイミングチ
ャート図、第４図は第２の実施例の制御ブロック図、第
５図（イ）（ロ）は従来例のプリプラ式射出成形機のシ
リンダ部の断面図、第６図は従来例の射出工程、保圧工
程及び計量のタイミングチャート図である。 １…射出シリンダ、２…プランジャー ９…逆流防止弁、10…貯溜空間（ａ） 12…貯溜空間（ｂ）、14…スクリュー 19…制御装置FIG. 1 is a sectional view of an essential part of an actual pre-plastic injection molding machine of the present invention, and FIGS. 2 (a), (b), (c), (d), and (e) show an injection process and a dwell in the first embodiment. Timing chart of process and measurement, Fig. 3 (a) (b) (c) (d) (e)
(F) is a timing chart of the steps and the weighing showing the second embodiment, FIG. 4 is a control block diagram of the second embodiment, and FIGS. 5 (a) and (b) are conventional plastic injection moldings. FIG. 6 is a sectional view of a cylinder portion of the machine, and FIG. 6 is a timing chart of an injection step, a pressure-holding step, and a measurement of a conventional example. DESCRIPTION OF SYMBOLS 1 ... Injection cylinder, 2 ... Plunger 9 ... Check valve, 10 ... Storage space (a) 12 ... Storage space (b), 14 ... Screw 19 ... Control device
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 45/00 - 45/84 Continuation of front page (58) Field surveyed (Int.Cl. 6 , DB name) B29C 45/00-45/84
Claims (2)
逆流防止弁により貯溜空間を（ａ）と（ｂ）とし、予め
可塑化した樹脂をスクリューにより前記貯溜空間（ｂ）
に注入し、プランジャーで前記貯溜空間（ａ）内の樹脂
を金型内に射出するプリプラ式射出成形機において、樹
脂を金型内に注入する射出工程では射出速度に比例した
回転数により計量し、さらに注入された樹脂を一定の圧
力で押圧する保圧工程では一定の回転数で計量すること
により、射出工程と保圧工程とを通して樹脂の計量を同
時に行うよう制御したことを特徴とするプリプラ式射出
成形機の計量制御方法。1. A storage space is defined as (a) and (b) by a check valve engaged with a plunger in an injection cylinder, and a pre-plasticized resin is screwed into the storage space (b).
In a prepra-type injection molding machine in which the resin in the storage space (a) is injected into the mold by a plunger, in the injection step of injecting the resin into the mold, the resin is measured by a rotation speed proportional to the injection speed. Further, in the pressure-holding step of pressing the injected resin at a constant pressure, by measuring at a constant rotation speed, the resin is controlled to be simultaneously measured through the injection step and the pressure-holding step. Metering control method for pre-plastic injection molding machines.
逆流防止弁により貯溜空間を（ａ）と（ｂ）とし、予め
可塑化した樹脂をスクリューにより前記貯溜空間（ｂ）
に注入し、プランジャーで前記貯溜空間（ａ）内の樹脂
を金型内に射出するプリプラ式射出成形機において、前
記貯溜空間の（ａ）と（ｂ）間の圧力差を可塑化スクリ
ューの回転数にフィードバックし、前記圧力差が常に一
定になるように制御して計量を行うことを特徴とするプ
リプラ式射出成形機の計量制御方法。2. The storage space is defined as (a) and (b) by a check valve which is engaged with a plunger in the injection cylinder, and the storage space (b) is formed by pre-plasticized resin by a screw.
And a plunger is used to inject the resin in the storage space (a) into the mold using a plunger. In the pre-plastic injection molding machine, the pressure difference between (a) and (b) in the storage space is reduced by the plasticizing screw. A weighing control method for a pre-plastic injection molding machine, wherein the weighing is performed by feeding back to a rotation speed and controlling the pressure difference to be always constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2128450A JP2948620B2 (en) | 1990-05-17 | 1990-05-17 | Metering control method for pre-plastic injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2128450A JP2948620B2 (en) | 1990-05-17 | 1990-05-17 | Metering control method for pre-plastic injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0422613A JPH0422613A (en) | 1992-01-27 |
| JP2948620B2 true JP2948620B2 (en) | 1999-09-13 |
Family
ID=14985015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2128450A Expired - Fee Related JP2948620B2 (en) | 1990-05-17 | 1990-05-17 | Metering control method for pre-plastic injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2948620B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230182393A1 (en) * | 2021-12-13 | 2023-06-15 | Seiko Epson Corporation | Material Feeding Device, Three-Dimensional Shaping Device, And Injection Molding Device |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3457716B2 (en) * | 1993-10-15 | 2003-10-20 | 三菱重工業株式会社 | Tandem injection molding machine |
| JPH07125025A (en) * | 1993-10-29 | 1995-05-16 | Yanagimoto Hoso Sangyo Kk | Plunger type resin injection device |
| KR100293498B1 (en) * | 1996-05-13 | 2001-09-17 | 모리시타 요이찌 | Injection device |
| KR100436963B1 (en) | 1998-06-17 | 2004-06-23 | 스미도모쥬기가이고교 가부시키가이샤 | Method For Controlling Drive Of Screw In Injection Molding Machine |
| DE10018542A1 (en) * | 2000-04-14 | 2001-10-18 | Krauss Maffei Kunststofftech | Injection machine for molding plastics or metals has a screw plasticizing unit which moves axially in the injection piston |
| DE102004051105A1 (en) | 2004-10-19 | 2006-04-27 | Billion S.A. | Plasticizing and injection device |
-
1990
- 1990-05-17 JP JP2128450A patent/JP2948620B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230182393A1 (en) * | 2021-12-13 | 2023-06-15 | Seiko Epson Corporation | Material Feeding Device, Three-Dimensional Shaping Device, And Injection Molding Device |
| US12064920B2 (en) * | 2021-12-13 | 2024-08-20 | Seiko Epson Corporation | Material feeding device, three-dimensional shaping device, and injection molding device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0422613A (en) | 1992-01-27 |
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