JPH03230930A - Fixed volume molding method of injection molding machine - Google Patents
Fixed volume molding method of injection molding machineInfo
- Publication number
- JPH03230930A JPH03230930A JP2556490A JP2556490A JPH03230930A JP H03230930 A JPH03230930 A JP H03230930A JP 2556490 A JP2556490 A JP 2556490A JP 2556490 A JP2556490 A JP 2556490A JP H03230930 A JPH03230930 A JP H03230930A
- Authority
- JP
- Japan
- Prior art keywords
- screw
- injection
- pressure
- resin
- check ring
- 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
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000000465 moulding Methods 0.000 title claims abstract description 8
- 238000001746 injection moulding Methods 0.000 title claims description 7
- 238000002347 injection Methods 0.000 claims abstract description 65
- 239000007924 injection Substances 0.000 claims abstract description 65
- 239000011347 resin Substances 0.000 claims abstract description 38
- 229920005989 resin Polymers 0.000 claims abstract description 38
- 238000007906 compression Methods 0.000 abstract description 8
- 230000006837 decompression Effects 0.000 abstract 1
- 230000006835 compression Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 101100328887 Caenorhabditis elegans col-34 gene Proteins 0.000 description 2
- 238000004018 waxing Methods 0.000 description 2
- 208000036071 Rhinorrhea Diseases 0.000 description 1
- 206010039101 Rhinorrhoea Diseases 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000002265 prevention Effects 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
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
-
- 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
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/52—Non-return devices
-
- 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
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- 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
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C2045/5096—Axially movable screw decompression of the moulding material by retraction or opposite rotation of the screw
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- 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定容量成形方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a constant volume molding method for an injection molding machine.
（従来の技術）
第４図にて従来の射出成形機の成形方法を説明すると、
射出成形はペレットと呼ばれる粒状の樹脂を熔融し、強
大な力で閉塞された金型に、細いノズルを介して射出、
冷却固化させ、所望の形状を有する成形品を得る成形方
法である。(Prior art) The molding method of a conventional injection molding machine is explained with reference to Fig. 4.
Injection molding involves melting granular resin called pellets and injecting it through a thin nozzle into a mold that is closed with great force.
This is a molding method in which a molded product having a desired shape is obtained by cooling and solidifying.
さて射出成形において樹脂を溶融（可ワ化という）し、
閉塞された金型に溶融樹脂を充填する（射出という）工
程を以下に説明する。なお、この例における各動作は、
比例電磁流量制御弁、比例電磁圧力制御弁、又はサーボ
弁等によって制御される油圧駆動方式であるが、これら
は既に一般化された技術であるため、ここではその説明
は省略する。Now, in injection molding, the resin is melted (called waxing),
The process of filling the closed mold with molten resin (referred to as injection) will be described below. In addition, each operation in this example is
The hydraulic drive system is controlled by a proportional electromagnetic flow control valve, a proportional electromagnetic pressure control valve, a servo valve, etc., but since these are already generalized technologies, their explanation will be omitted here.
先ず可ｗ化について説明すると、ホッパ１３内に貯留さ
れた粒状の樹脂（ペレット）は、油圧モータ１２で回転
駆動されるスクリュ１の剪断発熱、及びシリンダ２の周
囲に装着されたヒータ６により加熱溶融され、この溶融
樹脂はスクリュ１のねし作用により送られてシリンダ２
先端部の空間部１０に貯留される。First of all, to explain the process of making the resin into wt. The molten resin is sent to the cylinder 2 by the screw action of the screw 1.
It is stored in the space 10 at the tip.
また可塑化する量は、一般に以下のようにして決められ
る。先ずスクリュ１の位置は、ポテンショメータ、エン
コーダ、リミットスイソチ等の位置検出器１５により検
出される。一般にスクリュ位置の原点、即ち零位置には
スクリュ最前進位置がとられ、この零位置からのストロ
ーク量で可塑化量（これを計量完了位置という）が設定
される。Moreover, the amount of plasticization is generally determined as follows. First, the position of the screw 1 is detected by a position detector 15 such as a potentiometer, encoder, or limit switch. Generally, the most forward position of the screw is set at the origin of the screw position, that is, the zero position, and the amount of plasticization (this is referred to as the metering completion position) is set by the stroke amount from this zero position.
ここで制御装置２１内の計量完了位置設定器Ｓ１に設定
された設定値と、位置検出器１５で検出されるスクリュ
位置が比較器２０で比較され、スクリュ位置が設定値に
到達すると、油圧モータ１２を回転駆動する比例制御弁
３１．３２及び、及び電磁切換弁３４をオフにして油圧
ポンプ３０からの圧油の供給を止め、油圧モータ１２及
びスクリュ１の回転を止めて可塑化を終了する。Here, the comparator 20 compares the set value set in the metering completion position setter S1 in the control device 21 and the screw position detected by the position detector 15, and when the screw position reaches the set value, the hydraulic motor The proportional control valves 31, 32 and the electromagnetic switching valve 34 that rotationally drive the hydraulic motor 12 are turned off to stop the supply of pressure oil from the hydraulic pump 30, and the rotation of the hydraulic motor 12 and the screw 1 is stopped to complete plasticization. .
次に射出について説明する。Next, injection will be explained.
金型８が図示しない型締装置によって強大な力で閉塞さ
れると、ソレノイドバルブ３３のソレノイドｂが励磁さ
れ、油圧ポンプ３０の圧油が、比例電磁流量制御弁３１
及び比例電磁圧力制御弁３２により制御されて射出シリ
ンダ５の油室Ａに供給され、射出ラム４と出力軸７を介
してスクリュｌを前進させることにより射出動作に入る
。When the mold 8 is closed with great force by a mold clamping device (not shown), the solenoid b of the solenoid valve 33 is energized, and the pressure oil of the hydraulic pump 30 is transferred to the proportional electromagnetic flow control valve 31.
The oil is supplied to the oil chamber A of the injection cylinder 5 under the control of the proportional electromagnetic pressure control valve 32 and advances the screw l via the injection ram 4 and the output shaft 7, thereby starting an injection operation.
そして成形品に応じた射出速度及び射出圧力のパターン
が、スクリュ位置に対応して制御装置２１内のスクリュ
位置設定器８２〜Ｓ４、射出速度設定器ｖ１〜ｖ４、射
出圧力設定器ＰＩ、 Ｐ２で設定される。The pattern of injection speed and injection pressure according to the molded product is determined by the screw position setters 82 to S4, injection speed setters v1 to v4, and injection pressure setters PI and P2 in the control device 21 in accordance with the screw position. Set.
また前記スクリュ位置は、既に述べたようにスクリュ最
前進位置を基準にして、そこからの距離を設定する。例
えば、第４図において、Ｓ１＝１００ｍｍ、 Ｓ２＝５
０ｍｍ、 Ｓ３＝２０ｍｍ、、Ｓ４＝１５ｍｍＶ１＝１
０％、Ｖ２ ＝ ６０％、Ｖ３ ＝ ２０％、Ｖ４＝１
０％ＰＬ＝９０％、Ｐ２ ＝ ６０％
となるように設定すると、以下のような動作となる。Further, as described above, the screw position is set as a distance from the most advanced position of the screw as a reference. For example, in Fig. 4, S1=100mm, S2=5
0mm, S3=20mm,,S4=15mmV1=1
0%, V2 = 60%, V3 = 20%, V4 = 1
If settings are made such that 0% PL = 90% and P2 = 60%, the following operation will occur.
なお、この時スクリュ１は可塑化が終了して既にＳｌの
位置に到達しているが、実際にはスクリュ１を瞬時に停
止させることができないことや、樹脂の膨張等により、
Ｓｌの設定位置１００ｍｍより大きな数値の位置にある
。この位置をＳＬ’−１０５ｍｍとすると、ＳＬ’ ＝
１０５ｍｍから３２＝５０ｍｍの区間は、射出速度がｖ
ｌ−１０％の速度に対応する流量を射出シリンダ５に供
給するように、制御装置２１から電圧又は電流信号が比
例電磁流量制御弁３１に与えられ、この信号によって油
圧ポンプ３０からの圧油を、必要な流量に比例電磁流量
制御弁３１がコントロールする。At this time, the screw 1 has finished plasticizing and has already reached the Sl position, but in reality, it is not possible to stop the screw 1 instantly, and due to expansion of the resin, etc.
It is located at a numerical value greater than the set position of 100 mm for Sl. If this position is SL'-105mm, SL' =
In the section from 105mm to 32=50mm, the injection speed is v
A voltage or current signal is given from the control device 21 to the proportional electromagnetic flow control valve 31 so as to supply the injection cylinder 5 with a flow rate corresponding to a speed of l-10%, and this signal causes the pressure oil from the hydraulic pump 30 to be supplied to the injection cylinder 5. , a proportional electromagnetic flow control valve 31 controls the required flow rate.
また本領域は速度制御区間であり、Ｐｌ＝９０％の射出
圧力に対応する油圧以上に圧力が上昇しないよう、リミ
ッタをかけている。これは制御装置２１から、Ｐ１＝９
０％の射出圧力に対応する油圧に相当する電圧又は電流
信号を比例電磁圧力制御弁３２に加え、この圧力以上に
射出シリンダ５の油室Ａに供給される油圧が上昇しない
ように制御している。同様に設定器Ｓ２からＳ３、Ｓ３
からＳ４の区間は、射出圧力ＰＩ ＝ ９０％以上にな
らないように、また射出速度は各々Ｖ２ ＝ ６０％、
Ｖ３−２０％の速度に制御される。なお、Ｓ４からの区
間は、シリンダ２の先端にあるノズルからスクリュ１に
よって射出された樹脂が、金型８のキャビティ９内に充
満し、樹脂を圧縮する圧力を制御する、所謂保持圧と呼
ばれる区間であり、図示しないタイマにより圧力制御を
行う時間が設定される。Further, this region is a speed control section, and a limiter is applied so that the pressure does not rise above the hydraulic pressure corresponding to the injection pressure of Pl=90%. This is from the control device 21, P1=9
A voltage or current signal corresponding to the oil pressure corresponding to 0% injection pressure is applied to the proportional electromagnetic pressure control valve 32, and the oil pressure supplied to the oil chamber A of the injection cylinder 5 is controlled so as not to rise above this pressure. There is. Similarly, setting devices S2 to S3, S3
In the section from S4 to S4, the injection pressure should not exceed PI = 90%, and the injection speed should be V2 = 60%, respectively.
The speed is controlled to V3-20%. In addition, the section from S4 is called a holding pressure where the resin injected by the screw 1 from the nozzle at the tip of the cylinder 2 fills the cavity 9 of the mold 8 and controls the pressure to compress the resin. This is an interval, and the time for pressure control is set by a timer (not shown).
スクリュ位置が３４＝５ｍｍに到達すると、射出速度は
Ｖ４＝１０％、射出圧力はＰ２ ＝ ６０％の設定とな
る。またキャビティ９内の樹脂圧が高まってＰ２ ＝
６０％相当の圧力に達すると、比例電磁圧力制御弁３２
によりＰ２ ＝ ６０％に相当する圧力の油圧が射出・
シリンダ５の油室Ａに供給されて、圧力制御される。次
に前記タイマがタイムアウトすると、スクリュｌは再び
可塑化動作に入り、次いで冷却を終了すると、図示しな
い型締装置により金型８は開かれ、キャビティ９内の成
形品は取り出される。なお、第４図では図示していない
が、スクリュ１の頭部には、射出動作の際空間部１０の
溶融樹脂が射出圧力により逆流しない様に、チエツクリ
ングが配設されているのが通例である。When the screw position reaches 34=5 mm, the injection speed is set to V4=10% and the injection pressure is set to P2=60%. Also, the resin pressure inside the cavity 9 increases and P2 =
When the pressure reaches 60%, the proportional solenoid pressure control valve 32
Therefore, the hydraulic pressure corresponding to P2 = 60% is injected.
It is supplied to the oil chamber A of the cylinder 5 and the pressure is controlled. Next, when the timer times out, the screw I enters the plasticizing operation again, and then, when cooling is finished, the mold 8 is opened by a mold clamping device (not shown), and the molded product in the cavity 9 is taken out. Although not shown in FIG. 4, a check ring is usually provided at the head of the screw 1 to prevent the molten resin in the space 10 from flowing back due to the injection pressure during the injection operation. It is.
（発明が解決しようとする課題）
しかし前記従来の射出成形方法では、スクリュ頭部のチ
エツクリングと、シート部間のシールにバラツキがあっ
て成形品重量が安定しない欠点があり、また計量完了位
置を正確に制御することは、困難であり、結果として成
形品重量が安定しない等の問題があった。(Problems to be Solved by the Invention) However, the conventional injection molding method described above has the drawback that the weight of the molded product is not stable due to variations in the check ring at the screw head and the seal between the seat parts, and the problem is that the weight of the molded product is not stable. It is difficult to control accurately, and as a result, there are problems such as unstable weight of the molded product.
本発明は前記従来の課題を解決しようとするものである
。The present invention aims to solve the above-mentioned conventional problems.
（課題を解決するための手段）
このため本発明は、可塑化計量工程完了後、射出シリン
ダ先端部の溶融樹脂を一定圧力に加圧すると共に、射出
スクリュ頭部の逆流防止弁を閉に保ちつつ、同射出スク
リュを僅かに後退させて前記樹脂圧力を大気圧とほぼ等
しくした後、前記溶融樹脂を一定圧力に加圧した時の前
記射出スクリュの位置を基準位置として射出工程を行う
構成を備え、これを課題解決のための手段とするもので
ある。(Means for Solving the Problems) For this reason, the present invention pressurizes the molten resin at the tip of the injection cylinder to a constant pressure after the plasticization metering process is completed, and at the same time keeps the backflow prevention valve at the injection screw head closed. , the injection screw is slightly retracted to make the resin pressure almost equal to atmospheric pressure, and then the injection step is performed using the position of the injection screw when the molten resin is pressurized to a constant pressure as a reference position. , this is a means to solve problems.
（作用）
可塑化完了後、スクリュ先端溶融樹脂を一定樹脂圧まで
圧縮し、一定樹脂圧状態でのスクリュ位置を射出開始原
点とし、その後スクリュを押す力を零にしてスクリュ先
端部チエツクリングが閉の状態のまま、スクリュ先端部
の樹脂圧をほぼ零にし、射出工程では、前記射出開始原
点を基準位置（零位置）として、成形品に必要な射出速
度、圧カバターンで射出動作を行う。このようにスクリ
ュ先端部チエツクリング閉状態のまま、スクリュ先端樹
脂圧をほぼ零まで減圧することにより、正確な射出容量
が実現でき、糸引き等の不具合をシャットオフバルブを
用いることなく防止できる。(Function) After plasticization is completed, the molten resin at the screw tip is compressed to a constant resin pressure, the screw position at constant resin pressure is set as the injection start origin, and then the force pushing the screw is reduced to zero, and the check ring at the screw tip is closed. While in this state, the resin pressure at the tip of the screw is reduced to almost zero, and in the injection process, the injection start origin is set as the reference position (zero position), and the injection operation is performed at the injection speed and pressure cover turn necessary for the molded product. In this way, by reducing the resin pressure at the screw tip to almost zero while the screw tip check ring remains closed, accurate injection volume can be achieved and problems such as stringiness can be prevented without using a shutoff valve.
（実施例）
以下本発明を図面の実施例について説明すると、第１図
（ａ）（ｂ）（Ｃ） （ｄ）（ｅ）は本発明の実施例を
示す。(Embodiments) The present invention will be described below with reference to embodiments of the drawings. FIGS. 1(a), (b), (C), (d), and (e) show embodiments of the present invention.
ところで本発明は従来と同様に可塑化動作終了後、スク
リュ１に前進圧力をかけてスクリュ先端樹脂圧をある一
定値まで上昇させ、チエツクリングを完全に閉じる予備
圧縮工程を設け、この圧縮工程終了時のスクリュ位置を
原点として記憶する。更に鼻たれ、糸引き防止のために
、スクリュを前進させる力を零とし、スクリュ先端樹脂
圧でチエツクリングを完全に閉したままスクリュが後退
する減圧工程を設け、その後前記原点を基準にして射出
工程を行う定容量成形方法である。以下にその詳細を説
明する。By the way, in the present invention, as in the conventional case, after the plasticizing operation is completed, a forward pressure is applied to the screw 1 to increase the resin pressure at the tip of the screw to a certain value, and a preliminary compression step is provided in which the check ring is completely closed, and this compression step is completed. The screw position at the time is memorized as the origin. Furthermore, in order to prevent runny nose and stringiness, a depressurization process is provided in which the force for advancing the screw is reduced to zero, and the screw retreats while the check ring is completely closed by the pressure of resin at the tip of the screw, and then injection is performed based on the origin. It is a constant volume molding method that performs the process. The details will be explained below.
先ず可塑化は従来例（第４図）と全く同様であるので、
第４図を用いて説明するが、可塑化量（計量完了位置）
は、スクリュ最前進位置を原点、即ち零とし、零からの
ストローク量で設定器Ｓ１に設定される。First, since plasticization is exactly the same as in the conventional example (Fig. 4),
As will be explained using Fig. 4, the amount of plasticization (measurement completion position)
The maximum forward position of the screw is set as the origin, that is, zero, and the stroke amount from zero is set in the setting device S1.
第１１１ｍ（ａ）において、可塑化中はチエツクリング
１ａば、左端、即ちスクリュ１のトーピード１ｂの端面
に当接している。次いで可ワ化が完了する、即ちスクリ
ュ位置が設定器Ｓ１で設定された位置に到達すると、第
４図で説明したように、スクリュ１の回転は停止する。At No. 111m(a), the check ring 1a is in contact with the left end, that is, the end face of the torpedo 1b of the screw 1, during plasticization. Next, when the waxing is completed, that is, the screw position reaches the position set by the setting device S1, the rotation of the screw 1 is stopped, as explained in FIG. 4.
しかしスクリュ位置のオーバラン及び樹脂の膨張等によ
り、スクリュ１はＳｌより若干量後退した位置ＳＩＢに
あり（第２図）、またチエツクリング１ａはトービーＦ
’ １ ｂの端面にも、シート部ＩＣにも当接しない中
途半端な位置にある（第１図（ｂ）の状態）。However, due to overrun in the screw position and expansion of the resin, screw 1 is at position SIB, which is slightly retracted from Sl (Fig. 2), and check ring 1a is
It is in a halfway position where it does not come into contact with either the end face of '1b or the seat IC (the state shown in FIG. 1(b)).
次に予備圧縮工程について説明する。Next, the preliminary compression process will be explained.
スクリュ１の回転が停止すると、予備圧縮動作を行う。When the screw 1 stops rotating, a preliminary compression operation is performed.
これはチエツクリング１ａを第１図（Ｃ）に示すように
シート部１ｃに完全に当接させてシルを確実にすると共
に、シリンダ２先端の空間部１０の樹脂圧力が、一定値
Ｐｒ状態でのスクリュ位置を制御装置に記憶するもので
ある。次いでスクリュ１が停止すると、ソレノイドバル
ブ３３（第４図）のソレノイドｂを励磁し、比例電磁圧
力制御弁３２で所望の一部油圧Ｐ、に制御された圧油が
、シリンダ５の油室Ａに供給される。これは前記一定値
Ｐｒに相当する油圧で、スクリュ１の断面積と射出ラム
４の面積比となる。This ensures that the check ring 1a is in complete contact with the seat portion 1c as shown in FIG. The screw position is stored in the control device. Next, when the screw 1 stops, the solenoid b of the solenoid valve 33 (FIG. 4) is energized, and the pressure oil, which is controlled to a desired partial oil pressure P by the proportional electromagnetic pressure control valve 32, flows into the oil chamber A of the cylinder 5. is supplied to This is the oil pressure corresponding to the constant value Pr, and is the ratio of the cross-sectional area of the screw 1 to the area of the injection ram 4.
次に第２図において、可塑化完了後で、ｔＡタイマ（こ
れはスクリュ回転数が零になる時間より若干大きく設定
される）のクイ１、アップ後に予備圧縮動作に入る。更
にｔＢタイマのタイムアツブで、その時のスクリュ位置
ＳＩＡを制御装置２１に記憶する。ｔＢクイマは、スク
リュ先端樹脂圧が一部値Ｐ、で安定する時間より若干長
く設定される。こうすることにより、チエツクリング１
ａが完全に閉塞（シート部１ｃに当接した状態）し、シ
リンダ２の空間部１０の樹脂圧が一定での可塑化樹脂量
を決定できる。Next, in FIG. 2, after the plasticization is completed and the tA timer (this is set slightly longer than the time when the screw rotation speed becomes zero) is turned up, a preliminary compression operation is started. Further, the screw position SIA at that time is stored in the control device 21 at the time of the tB timer. tB time is set to be slightly longer than the time during which the screw tip resin pressure stabilizes at a partial value P. By doing this, check ring 1
The amount of plasticized resin can be determined when the cylinder a is completely closed (in contact with the seat portion 1c) and the resin pressure in the space 10 of the cylinder 2 is constant.
次に減圧について説明する。Next, pressure reduction will be explained.
この減圧は糸引き、鼻たれ等を防止するため、再びスク
リュ先端樹脂を減圧する工程であるが、チエツクリング
１ａを前記予備工程と同じく閉塞した状態を維持する必
要がある。第１図（ａ）のように、スクリュ１の基部１
ｄは、回転は出力軸７とキー１ｅにより拘束されている
が、軸方向には摺動自在に装着され、第１図（ｅ）のよ
うにその隙間ｌ（摺動可能距離）は１０肛内外に設ける
。This pressure reduction is a step in which the screw tip resin is again reduced in pressure in order to prevent stringiness, nasal drip, etc., but it is necessary to maintain the check ring 1a in the same closed state as in the preliminary step. As shown in FIG. 1(a), the base 1 of the screw 1
d is restrained in rotation by the output shaft 7 and key 1e, but is slidably mounted in the axial direction, and the gap l (slidable distance) is 10 holes as shown in Fig. 1(e). Provided inside and outside.
次に第１図（ｄ）に示すように減圧工程に入ると、第４
図に示すソレノイドバルブ３３のソレノイドａが励磁さ
れ、比例電磁流量制御弁３１、比例電磁圧力制御弁３２
によって制御された油圧ポンプ■
３０の圧油が、シリンダ５の油室Ｂに供給され、出力軸
７は後退（図面右方向に移動）する。しかしこの後退量
はほぼ５〜７ｍｍ程度であり、出力軸７とスク、リュ１
の基部１ｄは摺動自在に固定のため、スクリュ１を残し
たまま出力軸７のみが後退する。次にシリンダ２空間部
１０の樹脂圧により、スクリュは後退するが、樹脂圧に
よる後退のため、チエツクリング１ａは閉塞状態を維持
し、スクリュ先端樹脂圧がほぼ零になるまでスクリュは
後退する。Next, as shown in FIG. 1(d), when the pressure reduction step begins, the fourth
The solenoid a of the solenoid valve 33 shown in the figure is energized, and the proportional electromagnetic flow control valve 31 and the proportional electromagnetic pressure control valve 32 are energized.
Pressure oil from the hydraulic pump 30 controlled by the pump 1 is supplied to the oil chamber B of the cylinder 5, and the output shaft 7 moves backward (moves to the right in the drawing). However, this retraction amount is approximately 5 to 7 mm, and the output shaft 7, screw, and screw 1
Since the base 1d is slidably fixed, only the output shaft 7 retreats while leaving the screw 1. Next, the screw retreats due to the resin pressure in the cylinder 2 space 10, but the check ring 1a maintains the closed state due to the retreat due to the resin pressure, and the screw retreats until the screw tip resin pressure becomes approximately zero.
次に射出工程（第１図（ｅ））について説明する。Next, the injection process (FIG. 1(e)) will be explained.
減圧工程が終了、かつ冷却完了で型が開かれ、成形品が
取り出された後、型が閉じられて射出工程に入る。なお
、射出工程の油圧回路上の動きは、従来例と全く同一の
ため、ここではその説明は省略する。次に第２図及び第
３回によりこれを説明する。After the depressurization process is completed and cooling is complete, the mold is opened and the molded product is taken out, after which the mold is closed and the injection process begins. The movement on the hydraulic circuit during the injection process is exactly the same as that of the conventional example, so a description thereof will be omitted here. Next, this will be explained with reference to FIG. 2 and Part 3.
射出工程は成形品に応じた射出速度及び射出圧力のパタ
ーンが、スクリュ１の位置に対応して設定される。本発
明は前記予備圧縮された状態でのスクリュ１の位置ＳＩ
Ａ （これは前記のように、既に制御装置２１に記憶さ
れている）を原点として、同ＳＩＡからのストローク量
に対応して射出速度、射出圧力が設定される。In the injection process, patterns of injection speed and injection pressure depending on the molded product are set corresponding to the position of the screw 1. The present invention provides a position SI of the screw 1 in the pre-compressed state.
With A (as described above, this is already stored in the control device 21) as the origin, the injection speed and injection pressure are set in accordance with the stroke amount from the SIA.
例えば第４図において、
Ｓ１＝１００ｍｍＸＳ２＝５０ｍｍ、 Ｓ３＝８０ｍｍ
、 ５４＝８５＋ｎｍ、Ｖｌ ＝ １０％、Ｖ２ ＝
６０％、Ｖ３ ＝ ２０％、Ｖ４＝１０％、ＰＬ ＝
９０％、Ｐ２ ＝ ６０％
となるように設定され、前記スクリュの位置Ｓ１八がス
クリュ最前進位置を零として、９５ｍｍで記憶され、射
出開始直前のスクリュ位置をスクリュ最前進位置を零と
して！ｌｉ１’ −１０５［１［１１とすると、スクリ
ュ１は射出開始直前ＳＬ’ −１０５ｍｍの位置にある
。For example, in Fig. 4, S1=100mmXS2=50mm, S3=80mm
, 54=85+nm, Vl = 10%, V2 =
60%, V3 = 20%, V4 = 10%, PL =
90%, P2 = 60%, and the screw position S18 is stored as 95mm with the screw most advanced position as zero, and the screw position immediately before the start of injection is set as zero as the screw most advanced position! When li1' -105[1[11], the screw 1 is at a position of SL' -105 mm immediately before the start of injection.
また設定器Ｓ２． Ｓ３． Ｓ４は、スクリュの位置Ｓ
ＩＡからのストローク量で設定されており、射出第１遠
目は以下のようになる。スクリュ最前進位置を零として
、Ｓｌ’ −１０５，ｍｍから４５ｍｍ＝ＳＩＡ−５２
設定値＝ ９５−５０の区間は、射出速度はＶｌ ＝
１０％、射出圧力はＰ１＝９０％のリミッタがかけられ
てい３
る。Also, the setting device S2. S3. S4 is the screw position S
It is set by the stroke amount from IA, and the first distance of injection is as follows. Taking the screw most advanced position as zero, 45mm from Sl' -105,mm = SIA-52
In the section of set value = 95-50, the injection speed is Vl =
10%, and the injection pressure is limited by P1 = 90%.
同様にスクリュ最前進位置を零として、射出第２遠目は
、 （ＳＩＡ−３２設定値）−４５＋ｎｍから（ＳＩＡ
−３３設定値） −１５ｍｍの区間は、Ｖ２ ＝ ６０
％、Ｐｌ−９０％に制御される。射出第３速目は、（Ｓ
ＩＡ−３３設定値）−１５ｍｍから（ＳＩＡ−３４設定
値）−１０ｍｍの区間は、Ｖ３ ＝ ２０％、Ｐｌ＝９
０％に制御される。また射出第４速目は従来例と同様に
保持圧区間であり、タイマにより圧力制御を行う時間が
設定される。スクリュ位置が（ＳＩＡ −３４設定値）
−１０ｍｍを超えると、Ｖ４ ＝ １０％、Ｐ２ ＝
６０％の設定となる。Similarly, assuming the screw most advanced position to be zero, the second far end of injection is from (SIA-32 setting value) -45+nm to (SIA
-33 setting value) -15mm section is V2 = 60
%, Pl-90%. The third injection speed is (S
In the section from (IA-33 setting value) -15mm to (SIA-34 setting value) -10mm, V3 = 20%, Pl = 9
Controlled to 0%. Further, the fourth injection speed is a holding pressure section as in the conventional example, and a timer sets a time for pressure control. The screw position is (SIA-34 setting value)
- Beyond 10mm, V4 = 10%, P2 =
The setting is 60%.
またキャビティ９内の樹脂圧が高まり、Ｐ２ ＝ ６０
％相当の圧力に到達すると、その圧力で保持される。In addition, the resin pressure inside the cavity 9 increases, and P2 = 60
%, the pressure is maintained at that pressure.
（発明の効果）
以上詳細に説明した如く本発明は構成されているため、
一定スクリュ先端樹脂圧でのスクリュ位置を射出原点と
しく予備圧縮工程）、チエツクリングとシート部が閉塞
状態のまま、スクリュ先端樹脂圧を零にする減圧工程が
行われるこ４
とになり、一定容量の射出が容易に実現できると共に、
シャツ［オフバルブ等の手段を用いるごとなく、鼻たれ
、糸引き等の欠点を防止できる。(Effects of the Invention) Since the present invention is configured as explained in detail above,
The pre-compression step is performed with the screw position at a constant screw tip resin pressure as the injection origin), and a depressurization step is performed to reduce the screw tip resin pressure to zero while the check ring and seat remain closed. Capacity injection can be easily achieved, and
Shirts [It is possible to prevent defects such as nasal dripping and stringiness without using measures such as an off-valve.
第１図は本発明の実施例に係る定容量成形方法を説明す
るスクリュ頭部及び基部の断面図、第２図は本発明にお
ける可塑化、射出の動作を説明する線図、第３図は本発
明における可塑化、射出パターン設定の説明図、第４図
は従来の射出装置におりる制御工程を説明する系統図で
ある。
図の主要部分の説明
スクリュ
１−一ビード
キー
シリンダ
出力軸
位置検出器
制御装置
１ａ−チェンクリング
１ｄ−−スクリュの基部
Ｌ
し
−」FIG. 1 is a cross-sectional view of the screw head and base explaining the constant volume molding method according to the embodiment of the present invention, FIG. 2 is a diagram explaining the plasticizing and injection operations in the present invention, and FIG. FIG. 4, which is an explanatory diagram of plasticization and injection pattern setting in the present invention, is a system diagram explaining the control process in a conventional injection device. Description of main parts of the figure Screw 1--Bead key cylinder output shaft position detector control device 1a-Chank ring 1d--Base L of screw
Claims (1)
を一定圧力に加圧すると共に、射出スクリュ頭部の逆流
防止弁を閉に保ちつつ、同射出スクリュを僅かに後退さ
せて前記樹脂圧力を大気圧とほぼ等しくした後、前記溶
融樹脂を一定圧力に加圧した時の前記射出スクリュの位
置を基準位置として射出工程を行うことを特徴とする射
出成形機の定容量成形方法。After the plasticization metering process is completed, the molten resin at the tip of the injection cylinder is pressurized to a constant pressure, and the injection screw is slightly retracted to increase the resin pressure while keeping the check valve at the injection screw head closed. A constant volume molding method for an injection molding machine, characterized in that after the pressure is made substantially equal to the atmospheric pressure, an injection step is performed using the position of the injection screw when the molten resin is pressurized to a constant pressure as a reference position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2556490A JPH03230930A (en) | 1990-02-05 | 1990-02-05 | Fixed volume molding method of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2556490A JPH03230930A (en) | 1990-02-05 | 1990-02-05 | Fixed volume molding method of injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03230930A true JPH03230930A (en) | 1991-10-14 |
Family
ID=12169427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2556490A Pending JPH03230930A (en) | 1990-02-05 | 1990-02-05 | Fixed volume molding method of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03230930A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0489363A1 (en) * | 1990-12-01 | 1992-06-10 | Battenfeld Kunststoffmaschinen Ges.m.b.H. | Method for injecting items of mouldable plastic and apparatus for carrying out this method |
| WO2003106136A1 (en) * | 2002-06-14 | 2003-12-24 | Netstal-Maschinen Ag | Method for injection-molding weight-accurate parts and corresponding injection molding machine |
| JP2007237498A (en) * | 2006-03-07 | 2007-09-20 | Nissei Plastics Ind Co | Error-monitoring method of injection molding machine |
| JP2013059891A (en) * | 2011-09-13 | 2013-04-04 | Meiki Co Ltd | Injection molding machine and method of operating injection molding machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5795427A (en) * | 1980-12-04 | 1982-06-14 | Toshiba Mach Co Ltd | Injection molding |
| JPS6022526A (en) * | 1983-07-09 | 1985-02-05 | Daikiyoo Bebasuto Kk | Tilt type opened roof for vehicle |
| JPS6220010A (en) * | 1985-07-19 | 1987-01-28 | Matsushita Electric Ind Co Ltd | Electric heating carpet |
-
1990
- 1990-02-05 JP JP2556490A patent/JPH03230930A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5795427A (en) * | 1980-12-04 | 1982-06-14 | Toshiba Mach Co Ltd | Injection molding |
| JPS6022526A (en) * | 1983-07-09 | 1985-02-05 | Daikiyoo Bebasuto Kk | Tilt type opened roof for vehicle |
| JPS6220010A (en) * | 1985-07-19 | 1987-01-28 | Matsushita Electric Ind Co Ltd | Electric heating carpet |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0489363A1 (en) * | 1990-12-01 | 1992-06-10 | Battenfeld Kunststoffmaschinen Ges.m.b.H. | Method for injecting items of mouldable plastic and apparatus for carrying out this method |
| WO2003106136A1 (en) * | 2002-06-14 | 2003-12-24 | Netstal-Maschinen Ag | Method for injection-molding weight-accurate parts and corresponding injection molding machine |
| JP2007237498A (en) * | 2006-03-07 | 2007-09-20 | Nissei Plastics Ind Co | Error-monitoring method of injection molding machine |
| JP4515401B2 (en) * | 2006-03-07 | 2010-07-28 | 日精樹脂工業株式会社 | Error monitoring method for injection molding machine |
| JP2013059891A (en) * | 2011-09-13 | 2013-04-04 | Meiki Co Ltd | Injection molding machine and method of operating injection molding machine |
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