JPH0261347B2 - - Google Patents
Info
- Publication number
- JPH0261347B2 JPH0261347B2 JP58085257A JP8525783A JPH0261347B2 JP H0261347 B2 JPH0261347 B2 JP H0261347B2 JP 58085257 A JP58085257 A JP 58085257A JP 8525783 A JP8525783 A JP 8525783A JP H0261347 B2 JPH0261347 B2 JP H0261347B2
- Authority
- JP
- Japan
- Prior art keywords
- speed
- injection
- cylinder
- control valve
- change
- 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 - Lifetime
Links
- 238000002347 injection Methods 0.000 claims description 128
- 239000007924 injection Substances 0.000 claims description 128
- 230000008859 change Effects 0.000 claims description 43
- 239000010720 hydraulic oil Substances 0.000 claims description 20
- 238000001746 injection moulding Methods 0.000 claims description 14
- 230000001133 acceleration Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 230000004044 response Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 description 27
- 238000010586 diagram Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004512 die casting Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
Landscapes
- Engineering & Computer Science (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〕
本発明はダイカストマシンや射出成形機等の射
出成形装置におけるシヨツトプランジヤのプラン
ジヤチツプを前進させる射出シリンダの射出速度
を制御する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 method for controlling the injection speed of an injection cylinder that advances a plunger tip of a shot plunger in an injection molding apparatus such as a die casting machine or an injection molding machine. be.
一般にダイカストマシン等の射出成形において
は、金型におけるキヤビテイの形状及び容積、又
は金型の温度に応じ、溶湯の射出速度及び射出圧
力等を適正に定めなければならない。これは射出
速度、射出圧力等が不適当であるとキヤビテイ内
への湯回りが悪く、欠落が生じる場合や、鋳造品
内に巣が発生する場合、更に、寸法精度や製品強
度が低下する場合等、種々の弊害が生じるからで
ある。
Generally, in injection molding using a die casting machine or the like, the injection speed and injection pressure of the molten metal must be appropriately determined depending on the shape and volume of the cavity in the mold, or the temperature of the mold. This is because if the injection speed, injection pressure, etc. are inappropriate, the flow of the metal into the cavity will be poor, which may cause chips to occur, cavities may occur in the cast product, and furthermore, dimensional accuracy and product strength may decrease. This is because various adverse effects such as these may occur.
従つて、溶湯の射出速度、射出圧力を適正にす
る為、射出シリンダへの油圧回路に流量制御弁を
用いて射出シリンダへの送油量を制御することに
より、又は低速射出用の油圧回路と高速射出用の
油圧回路とを設けることにより、プランジヤチツ
プの前進速度、即ち溶湯の射出速度に低速射出速
度と高速射出速度とを設け、射出スリーブ１５内
に充填した溶湯をキヤビテイに到達させる低速射
出速度V1と、キヤビテイに到達した溶湯をもつ
てキヤビテイを充填する高速射出速度V2との２
段階の射出をもつて射出成形を行ない、略一定の
低速射出速度V1及び低速射出速度とは異なる一
定の高速射出速度V2を設定して制御していた。 Therefore, in order to make the injection speed and injection pressure of molten metal appropriate, a flow control valve is used in the hydraulic circuit to the injection cylinder to control the amount of oil sent to the injection cylinder, or a hydraulic circuit for low-speed injection is used. By providing a hydraulic circuit for high-speed injection, a low-speed injection speed and a high-speed injection speed are provided for the forward speed of the plunger tip, that is, the injection speed of the molten metal, and the low-speed injection allows the molten metal filled in the injection sleeve 15 to reach the cavity. speed V 1 and high injection speed V 2 to fill the cavity with the molten metal that has reached the cavity.
Injection molding was performed with stepwise injection and controlled by setting a substantially constant low injection speed V 1 and a constant high injection speed V 2 different from the low injection speed.
そしてこの射出速度の制御に関し、従来はプラ
ンジヤチツプの移動範囲内において、１箇所又は
２箇所等の特定位置にて射出速度を測定監視し、
製品の欠落、巣の発生等を防止すべく作動油の油
圧を修正していたにすぎない。 Regarding the control of this injection speed, conventionally the injection speed is measured and monitored at one or two specific positions within the movement range of the plunger tip.
The hydraulic pressure of the hydraulic oil was simply adjusted to prevent products from missing or cavities from forming.
上述の様に、射出成形に際してはその射出速度
を検出しつつ制御しているも、溶湯の射出時間は
一般に数秒と短く、低速射出速度V1から高速射
出速度V2への立上り時間は百分の数秒乃至百分
の数十秒と極めて短い時間である故、この立上り
時間を制御することは極めて困難とされていた。
As mentioned above, during injection molding, the injection speed is detected and controlled, but the injection time of molten metal is generally short, a few seconds, and the rise time from low injection speed V 1 to high injection speed V 2 is 100 minutes. It has been extremely difficult to control this rise time because it is an extremely short time of several seconds to several tens of hundredths of a second.
本発明は、極めて高速で応答し得る流量制御弁
を用い、射出成形装置等のシリンダへの作動油の
供給液量又はシリンダからの排出液量を前記流量
制御弁で調整してシリンダ速度を所望の値に設定
及び変更することにより所定の最終高速射出速度
に至らしめることとし、且つ、低速射出速度から
高速射出速度への増速変化率を検出し、予め定め
られた流量制御弁の開度変化の加減速特性では、
速度の変化に要する所望の時間内若しくは所望の
シリンダ移動ストローク量の範囲内で、所望の速
度変更が達成できないと判断された場合、直ちに
前記流量制御弁の開度変化の加減速特性を変更し
てシリンダ速度を所望値まで到達させる様にす
る。
The present invention uses a flow control valve that can respond at extremely high speed, and adjusts the amount of hydraulic oil supplied to or discharged from the cylinder of an injection molding device or the like to achieve a desired cylinder speed. A predetermined final high-speed injection speed is reached by setting and changing the value of In the acceleration/deceleration characteristics of change,
If it is determined that the desired speed change cannot be achieved within the desired time required for the speed change or within the desired cylinder movement stroke amount, the acceleration/deceleration characteristics of the opening degree change of the flow control valve are immediately changed. so that the cylinder speed reaches the desired value.
本発明は、極めて高速で応答し得る流量制御弁
を用いる故、低速射出速度や高速射出速度等の一
定速度は勿論、低速射出速度から高速射出速度へ
の速度変化特性をも制御することができる。
Since the present invention uses a flow control valve that can respond at extremely high speed, it is possible to control not only constant speeds such as low injection speed and high injection speed, but also speed change characteristics from low injection speed to high injection speed. .
又、低速射出速度から高速射出速度への増速変
化率を検出し、設定変化率との誤差により所望の
速度変更が達成できないときは、直ちに流量制御
弁の開度変化特性を変更する修正を行なう故、常
に所望の最終速度を得ることができる。 Also, detect the rate of change in speed increase from low injection speed to high injection speed, and if the desired speed change cannot be achieved due to an error with the set rate of change, immediately make corrections to change the opening change characteristics of the flow control valve. Therefore, the desired final velocity can always be obtained.
本発明の実施例は、本件出願の出願人会社が新
たに開発したパルスモータを使用することにより
極めて高速且つ正確に作動油を制御し得る流量制
御弁を用いて射出シリンダの油圧を制御すること
とし、以て射出速度を正確に制御することを可能
とするものである。
An embodiment of the present invention is to control the oil pressure of an injection cylinder using a flow control valve that can control hydraulic oil extremely quickly and accurately by using a pulse motor newly developed by the applicant company of the present application. This makes it possible to accurately control the injection speed.
この流量制御弁３０は、第１図に示す如く、軸
線方向から作動油流入口３１と軸線に対し直角方
向への作動流出口３２とを有するバルブボデイ３
３内に、軸線方向へ移動する弁スプール３４を設
けている。更に弁スプール３４の後部には一体的
にナツト軸３５を連続させ、該ナツト軸３５の内
部軸心部にねじ軸３６をボールねじ３７によつて
螺合している。このねじ軸３６は後端に後部歯車
３８を有し、該後部歯車３８には回転量を制御可
能なパルスモータ４１にて回転するピニオンギヤ
３９が咬合している。尚、４５はナツト軸の回転
を防止するキーであり、ナツト軸３５の表面の一
部には永久磁石４６を固定し、この永久磁石４６
と対抗ケーシング４７の一部には例えばゼロツク
スセンサと呼ばれる磁石作用による位置検出器４
８を取り付けている。該位置検出器４８は永久磁
石４６の移動に感応する近接スイツチで構成し、
ナツト軸３５や弁スプール３４の軸線方向の移動
距離を正確に検知し、制御装置にフイードバツク
できる様にしている。又、弁ルプール３４の零位
置を永久磁石４６と位置検出器４８との作用によ
つて電気的に検知し、制御装置を介してパルスモ
ータ４１をその位置で正確に止めておくことがで
きるものであり、この位置検出器４８は精度が
0.01mmのものを用いている。 As shown in FIG. 1, this flow rate control valve 30 has a valve body 3 having a hydraulic oil inlet 31 from the axial direction and a hydraulic oil outlet 32 from the axis at right angles.
3 is provided with an axially moving valve spool 34. Furthermore, a nut shaft 35 is integrally connected to the rear portion of the valve spool 34, and a threaded shaft 36 is screwed into the inner shaft center portion of the nut shaft 35 by a ball screw 37. This screw shaft 36 has a rear gear 38 at its rear end, and a pinion gear 39 that is rotated by a pulse motor 41 whose rotation amount can be controlled is engaged with the rear gear 38. Note that 45 is a key for preventing rotation of the nut shaft, and a permanent magnet 46 is fixed to a part of the surface of the nut shaft 35.
A part of the opposing casing 47 is equipped with a magnetic position detector 4 called a xerox sensor, for example.
8 is installed. The position detector 48 comprises a proximity switch sensitive to the movement of the permanent magnet 46;
The moving distance of the nut shaft 35 and valve spool 34 in the axial direction can be accurately detected and fed back to the control device. Further, the zero position of the valve pool 34 can be electrically detected by the action of the permanent magnet 46 and the position detector 48, and the pulse motor 41 can be accurately stopped at that position via the control device. The accuracy of this position detector 48 is
A 0.01mm one is used.
この流量制御弁３０はパルスモータ４１の回転
に応じてボールねじ３６、ナツト軸３６を介して
弁スプール３４が軸線方向へ前後進して弁の開閉
と開度とを瞬時に調整し、作動油の流量制御を行
なうものである。 In this flow control valve 30, a valve spool 34 moves back and forth in the axial direction via a ball screw 36 and a nut shaft 36 in response to the rotation of a pulse motor 41, instantly adjusting the opening/closing and opening degree of the valve. This is to control the flow rate.
そしてこの流量制御弁３０は、前述の様に軸線
方向の端面部に作動油流入口３１を、且つ、側面
に作動油流出口３２を備えたシリンダ状のバルブ
ボデイ３３内で、弁スプール３４をパルスモータ
４１の作動により軸線方向に駆動して流量制御を
行なうものであり、作動油による弁スプール３４
の軸線方向推力を弁スプール３４の開き量及び移
動速度の増加に応じて急激に低下させることによ
り流量の高速切換に必要な駆動力を軽減させ、流
量制御弁３０による作動油の流量高速切換性能を
一層向上させ、又、駆動力の軽減を行なつてい
る。 As described above, this flow control valve 30 pulses the valve spool 34 within a cylindrical valve body 33 that has a hydraulic oil inlet 31 on the end surface in the axial direction and a hydraulic oil outlet 32 on the side surface. It is driven in the axial direction by the operation of the motor 41 to control the flow rate, and the valve spool 34 is driven by hydraulic oil.
By rapidly reducing the axial thrust of the valve spool 34 in accordance with the opening amount and movement speed of the valve spool 34, the driving force required for high-speed flow rate switching is reduced, and the performance of the hydraulic oil flow rate high-speed switching by the flow rate control valve 30 is improved. This further improves the performance and reduces the driving force.
従つてこの流量制御弁３０では、制御装置から
の指令信号により、パルスモータ３１の回転量、
即ち回転角度により弁スプール３４の開き量が決
まり、射出シリンダ１０への作動油の流量が制御
され、又、パルスモータ３１の回転速度の緩急に
より流量制御弁３０の開度変化の加減速特性が決
まり、作動油流量の変化率、即ち射出シリンダ１
０における射出速度の立上り状態が決まる。そし
てこの様な構造と作用とを有する流量制御弁３０
は、射出速度変更の指令を受けて弁スプール３４
が開き始めるまでの時間遅れを１ミリ秒以下に押
えることができ、通常の流量制御弁に比較し、応
答性が極めて良好であり、又、弁開閉等の作動性
や操作精度が極めて高くなつた。 Therefore, in this flow control valve 30, the rotation amount of the pulse motor 31,
That is, the opening amount of the valve spool 34 is determined by the rotation angle, and the flow rate of hydraulic oil to the injection cylinder 10 is controlled, and the acceleration/deceleration characteristics of the opening degree change of the flow rate control valve 30 are controlled by the speed of rotation of the pulse motor 31. determined, the rate of change of hydraulic oil flow rate, i.e. injection cylinder 1
The rising state of the injection speed at 0 is determined. And a flow control valve 30 having such a structure and operation
The valve spool 34 receives a command to change the injection speed.
The time delay until the valve starts to open can be kept to less than 1 millisecond, and compared to ordinary flow control valves, the response is extremely good, and the operability and operational accuracy of valve opening and closing are extremely high. Ta.
この様に極めて高速且つ正確に作動油の制御が
可能であり、又、作動油の流量制御に際し、その
変化率をも制御し得る流量制御弁３０を用いるこ
とにより溶湯の射出速度を一層正確に制御し得る
こととなつた。 In this way, it is possible to control the hydraulic oil extremely quickly and accurately, and by using the flow control valve 30 that can also control the rate of change when controlling the flow rate of the hydraulic oil, the injection speed of the molten metal can be controlled even more accurately. It became possible to control it.
この流量制御弁３０を用いて射出速度の制御を
行なうには、第２図に示す如く射出スリーブ１５
中を摺動自在に移動するプランジヤチツプ１７を
前後進させる射出シリンダ１０に対し、該射出シ
リンダ１０のシリンダロツド１１にストライカ１
２を設け、位置検出用リミツトスイツチ１３ａ，
１３ｂ……によりシリンダロツド１１の位置、即
ちプランジヤチツプ１７の位置を検出し、位置演
算器２１は位置検出用リミツトスイツチ１３ａ，
１３ｂ等から送られる位置検出信号と位置設定器
２２により定められた設定位置信号とを比較し、
プランジヤチツプ１７が所定位置に達したとき流
量制御弁制御装置２５へ位置信号を送信する様に
する。更に該流量制御弁制御装置２５は前記位置
演算器２１から位置信号を受信し、且つ、立上り
時間設定器２６から設定立上り時間信号を受け、
プランジヤチツプ１７の前進速度、即ち溶湯の射
出速度を第３図に示す如く制御すべく前述の如き
パルスモータ駆動の流量制御弁３０へ制御信号を
送る。尚、前記流量制御弁制御装置２５には、液
圧が変動した場合に流量制御弁３０の開度変化の
加減速特性を補償する機能も持たせておくとよ
い。 In order to control the injection speed using this flow rate control valve 30, the injection sleeve 15 is
A striker 1 is attached to the cylinder rod 11 of the injection cylinder 10 for moving back and forth a plunger tip 17 which is slidably moved inside the injection cylinder 10.
2, position detection limit switches 13a,
13b... detects the position of the cylinder rod 11, that is, the position of the plunger tip 17, and the position calculator 21 detects the position detection limit switch 13a,
Compare the position detection signal sent from 13b etc. with the set position signal determined by the position setting device 22,
When the plunger tip 17 reaches a predetermined position, a position signal is sent to the flow rate control valve controller 25. Further, the flow rate control valve control device 25 receives a position signal from the position calculator 21 and a set rise time signal from the rise time setter 26,
In order to control the forward speed of the plunger tip 17, ie, the injection speed of the molten metal, as shown in FIG. 3, a control signal is sent to the flow rate control valve 30 driven by the pulse motor as described above. The flow rate control valve control device 25 may also have a function of compensating the acceleration/deceleration characteristics of the opening degree change of the flow rate control valve 30 when the hydraulic pressure fluctuates.
この様にして制御する溶湯の射出速度として
は、前半を低速射出速度T1区間とし、射出スリ
ーブ内に充填した溶湯を低速射出速度V1でキヤ
ビテイへ押出す区間であり、該低速射出区間T1
の初期T5は徐々に低速射出速度V1へ増速するこ
とにより射出スリーブ内に充填した溶湯が射出ス
リーブの湯注入口から射出スリーブ外へ逆流噴出
することを防止する。そして、低速射出速度区間
T1の終期T6において射出速度V1を一度減速し、
キヤビテイに溶湯が到達したとき、狭い間隙であ
る湯道から比較的広い空間であるキヤビテイ内へ
溶湯が噴出し、キヤビテイ内のガス（空気）と溶
湯とが混合することを防止し、製品中に巣を発生
させる虞れを無くす。 The injection speed of the molten metal controlled in this way is such that the first half is a low injection speed T 1 section, and the molten metal filled in the injection sleeve is extruded into the cavity at a low injection speed V 1 , and the low injection speed T 1
The initial speed T 5 is gradually increased to a low injection speed V 1 to prevent the molten metal filled in the injection sleeve from backflowing out of the injection sleeve from the molten metal inlet of the injection sleeve. And low injection speed section
At the end of T 1, T 6 , the injection speed V 1 is decelerated once,
When the molten metal reaches the cavity, the molten metal gushes out from the narrow runner into the relatively wide cavity, preventing the gas (air) in the cavity from mixing with the molten metal, and preventing the molten metal from forming in the product. Eliminates the risk of nest formation.
そして溶湯がキヤビテイ内に少し入つた後はキ
ヤビテイ充填区間T2として高速で段階的又は一
気に溶湯をキヤビテイ内に充満させ、製品の欠落
及び寸法精度の低下等を防止する。この高速射出
を行なうキヤビテイ充填区間の最終射出速度V3
及び速度増加特性はキヤビテイの大きさや形状等
により決定する。 After the molten metal has entered the cavity a little, the molten metal is filled into the cavity at high speed in stages or all at once as a cavity filling section T2 , thereby preventing missing products and deterioration of dimensional accuracy. Final injection speed V 3 of the cavity filling section where this high-speed injection is performed
The speed increase characteristics are determined by the size and shape of the cavity.
尚、プランジヤチツプ１７７の位置検出には前
述の如くストライカ１２とリミツトスイツチ１３
とを用いる場合に限ることなく、マグネツトスケ
ール等適宜の位置検出器の置換えることができる
ことはいうまでもない。 As mentioned above, the striker 12 and limit switch 13 are used to detect the position of the plunger tip 177.
It goes without saying that the present invention is not limited to the use of a magnetic scale, and may be replaced with an appropriate position detector such as a magnetic scale.
更に速度検出器をも適宜に設け、射出開始から
射出終了に至る射出速度を検出することもでき
る。 Furthermore, a speed detector can also be appropriately provided to detect the injection speed from the start of injection to the end of injection.
ところで千分の１秒単位で応答する流量制御弁
３０を用いても作動油の粘性や圧縮性及び作動油
や他の機械的可動部分の慣性等により射出速度の
変化は数十乃至数百ミリ秒の遅れが生ずることが
ある。 By the way, even if a flow control valve 30 that responds in units of one-thousandth of a second is used, the injection speed will vary by several tens to hundreds of millimeters due to the viscosity and compressibility of the hydraulic oil and the inertia of the hydraulic oil and other mechanically moving parts. A delay of seconds may occur.
この制御信号に対する射出速度の遅れにより小
さな製品を射出成形にて鋳造する場合、充填時間
が短く、充填区間T2中において射出速度を変更
すると、射出終了時の射出速度が設定された最終
射出速度V3に達しないままキヤビテイへの充填
が完了する虞れがある。 When casting small products by injection molding due to a delay in the injection speed with respect to this control signal, the filling time is short and if the injection speed is changed during the filling section T2 , the injection speed at the end of injection will be the set final injection speed. There is a possibility that the filling of the cavity may be completed before reaching V 3 .
本発明は上述の如き欠点をも排する為、作動油
の回路系による遅れをも考慮し、この遅れは油圧
回路系が定まれば一意的に定まるものである故、
予め実測し、又、作動油の圧力や温度の関数とし
て定めておき、更に以下に述べる如く流量制御弁
３０の開度変化の加減速特性を設定制御すること
により所望の射出速度変化を達成させて高品質の
射出成形品を得るものである。 In order to eliminate the above-mentioned drawbacks, the present invention also takes into account the delay caused by the hydraulic oil circuit system, and since this delay is uniquely determined once the hydraulic circuit system is determined,
The desired injection speed change can be achieved by actually measuring in advance and determining it as a function of the pressure and temperature of the hydraulic oil, and further by setting and controlling the acceleration/deceleration characteristics of the opening degree change of the flow rate control valve 30 as described below. This method produces high-quality injection molded products.
即ち、本発明に用いる流量制御弁３０はパルス
モータ４１で駆動され弁スプール３４を移動させ
て作動油の流量を制御する故、流量制御弁３０の
制御信号として第４図に示す如き略台形の周波数
特性を有する制御信号を用い、第５図及び第６図
に示す如く種々の変化特性を有する制御信号を定
めておく。 That is, since the flow rate control valve 30 used in the present invention is driven by a pulse motor 41 and moves the valve spool 34 to control the flow rate of the hydraulic oil, the control signal for the flow rate control valve 30 has a substantially trapezoidal shape as shown in FIG. Using control signals having frequency characteristics, control signals having various change characteristics as shown in FIGS. 5 and 6 are determined in advance.
この様に周波数特性を略台形とするのは、パル
スモータ４１の起動周波数を順次増加させること
によりパルスモータが制御信号から脱調すること
をを防止する為であり、然る後、一定周波数f1に
よりパルスモータを定速駆動し、弁スプールの移
動速度を一定として溶湯の射出速度を直線的に増
加させる。その後制御信号の周波数を順次減少さ
せ、パルスモータを脱調させることなく減速し、
パルスモータを停止させて一定の射出速度を維持
する。尚、第４図において、線図で囲まれた部分
の面積は出力したパルス数、従つて、流量制御弁
３０の開度変化量を表わす。 The reason why the frequency characteristic is approximately trapezoidal in this way is to prevent the pulse motor from stepping out of control signal by increasing the starting frequency of the pulse motor 41 sequentially. 1 , the pulse motor is driven at a constant speed to linearly increase the injection speed of the molten metal while keeping the moving speed of the valve spool constant. After that, the frequency of the control signal is sequentially decreased to decelerate the pulse motor without causing it to step out.
Stop the pulse motor to maintain a constant injection speed. In FIG. 4, the area surrounded by the line represents the number of output pulses, and therefore the amount of change in the opening of the flow rate control valve 30.
本発明の実施例では、流量制御弁３０の開度変
化量、即ち、出力パルス数を一定として、例え
ば、第５図においてt6で示す様な一定的時間内に
到達する周波数を変化させ、以て速度変更に要す
る時間即ち速度変更に伴なう立上り時間Δtを任
意に調整し得る様にした。この様に各周波数特性
の最高一定周波数1，2，3……を変化させて
も、制御信号の全区間であるt0からt1、t0からt2、
t0からt3、……の間の周波数の総数、即ち、各制
御信号において積分した周波数が一定であれば、
第７図に示す如く、各周波数の最高値1、2、3
……に応じて射出速度の変化率即ち速度立上りの
パターンが異なるのみで到達する射出速度V2は
常に一定となる。尚、流量制御弁３０の開度量を
同じにして、第５図に示す様に、一定時間t6内に
到達する周波数を上げれば、必然的に、増加速特
性、減加速特性の立上り、立下りの傾斜は鋭くな
り、同一開度量まで流量制御弁３０が開く時間
は、t1、t2，……t5の順で短くなり、前記立上り
時間の調整が可能となる。 In the embodiment of the present invention, while the amount of change in the opening degree of the flow control valve 30, that is, the number of output pulses is kept constant, for example, the frequency that is reached within a fixed time as shown by t6 in FIG. 5 is changed, This makes it possible to arbitrarily adjust the time required to change the speed, that is, the rise time Δt associated with the speed change. In this way, even if the highest constant frequencies 1 , 2 , 3 ... of each frequency characteristic are changed, the entire control signal interval from t0 to t1 , from t0 to t2 ,
If the total number of frequencies between t 0 and t 3 , ..., that is, the frequency integrated in each control signal, is constant,
As shown in Figure 7, the highest values of each frequency are 1 , 2 , and 3.
The injection speed V 2 that is reached is always constant, only the rate of change in the injection speed, that is, the pattern of speed rise, differs depending on... Incidentally, if the opening amount of the flow rate control valve 30 is kept the same and the frequency reached within a certain time t6 is increased, as shown in FIG. The downward slope becomes sharper, and the time for the flow rate control valve 30 to open to the same opening amount becomes shorter in the order of t 1 , t 2 , . . . t 5 , making it possible to adjust the rise time.
又、第６図に示す如く制御信号の最高周波数が
一定であつても制御信号の所要時間を変化させた
場合には、溶湯の射出速度は第８図に示す如く一
定の最高周波数により一定の変化率、即ち直線的
な射出速度の増加を示すものであつて、所要時間
又は所要時間内の周波数積分値に応じて到達する
射出速度も順次高くなる。 Furthermore, even if the maximum frequency of the control signal is constant as shown in Fig. 6, if the required time of the control signal is changed, the injection speed of the molten metal will be constant due to the constant maximum frequency as shown in Fig. 8. It shows a rate of change, that is, a linear increase in the injection speed, and the injection speed reached increases sequentially according to the required time or the frequency integral value within the required time.
この様に制御信号の最高周波数1，2，3……
により溶湯射出速度の変化率が対応し、又、周波
数の積分値が射出速度の変化量に対応する故、
種々の射出速度変化、即ち、種々の変化率及び変
化量を定めることが容易であり、又、射出シリン
ダ１０が射出速度を設定する制御信号に追従しな
い場合においても、容易に積分値が一定にして最
高周波数が異なる周波数特性の制御信号に切り替
えることにより、射出速度の変化を所望の変化と
することができる。 In this way, the highest frequency of the control signal 1 , 2 , 3 ...
Since the rate of change in the molten metal injection speed corresponds to the amount of change in the injection speed, and the integral value of the frequency corresponds to the amount of change in the injection speed,
It is easy to determine various injection speed changes, that is, various rates and amounts of change, and even when the injection cylinder 10 does not follow the control signal that sets the injection speed, it is easy to keep the integral value constant. By switching to control signals having frequency characteristics having different maximum frequencies, the injection speed can be changed as desired.
尚、第７，８図に示した様な速度変更のパター
ンＰは、変更前の速度をV1、変更後の速度をV2、
更に立上り時間をΔtとした場合、V1，V2，Δtの
関数Ｐ＝（V1，V2，Δt）として現される。従
つて、制御速度領域のいろいろのV1，V2につい
ていろいろの立上り時間Δtを実測しておいて関
数化しておけば、上式に従つて必要なパターンＰ
が得られる。即ち、V1，V2，Δtを入力すれば自
動的に演算され、それに応じたパターンＰが作成
される。そして、このパターンＰは無限に、乃至
は無段階的に選ぶことができる。 Incidentally, the speed change pattern P as shown in FIGS. 7 and 8 is such that the speed before the change is V 1 , the speed after the change is V 2 ,
Further, when the rise time is Δt, it is expressed as a function P=(V 1 , V 2 , Δt) of V 1 , V 2 , and Δt. Therefore, by actually measuring various rise times Δt for various V 1 and V 2 in the control speed region and converting them into functions, the necessary pattern P can be obtained according to the above formula.
is obtained. That is, if V 1 , V 2 , and Δt are input, they are automatically calculated, and a pattern P corresponding to them is created. This pattern P can be selected infinitely or steplessly.
そして、前記立上り時間Δtの代りに、速度変
更の時間内に前進する射出シリンダのストローク
Stを用いることもできる。 Then, instead of the rise time Δt, the stroke of the injection cylinder that moves forward within the time of speed change
St can also be used.
又、例えば、射出途中において意図的に射出シ
リンダを止める場合などの様に、前記立上り時間
Δtを最短にしたい場合に、所望の立上り時間Δt
が短すぎて、所望の速度V2まで上昇させ得ない
場合は、前記関数にV2よりも大きいV3に自動的
に変更した値をV2の代りに入力して、所望のパ
ターンＰを得、その一部を用いることもできる。 Also, if you want to minimize the rise time Δt, such as when you intentionally stop the injection cylinder during injection, the desired rise time Δt
is too short and cannot be increased to the desired speed V 2 , input the value automatically changed to V 3 , which is larger than V 2 , into the function in place of V 2 to create the desired pattern P. You can also use a part of it.
この様に本発明の実施例は、射出成形装置等の
射出シリンダ１０の速度制御を行なう場合におい
て、該射出シリンダ１０への作動油の供給液量又
は射出シリンダ１０からの排出液量を流量制御弁
３０にて調整するに際し、パルスモータ４１によ
り駆動される流量制御弁３０を用い、溶湯の射出
速度の変化を検出しつつ射出速度と射出速度の変
化率とを制御し、射出シリンダ１０による溶湯の
射出速度が設定値に対して遅れる場合には、当該
射出中に適正な射出速度の変化率へ修正し、単に
所望時間内若しくは射出シリンダの移動ストロー
ク範囲内にシリンダ速度を所望値に到達せしめる
様に修正する射出成形装置等のシリンダ速度制御
方法である。 As described above, in the case of controlling the speed of the injection cylinder 10 of an injection molding apparatus or the like, the embodiment of the present invention controls the flow rate of the amount of hydraulic oil supplied to the injection cylinder 10 or the amount of liquid discharged from the injection cylinder 10. When adjusting with the valve 30, the flow control valve 30 driven by the pulse motor 41 is used to control the injection speed and the rate of change of the injection speed while detecting the change in the injection speed of the molten metal. If the injection speed of the cylinder lags behind the set value, the rate of change of the injection speed is corrected during the injection, and the cylinder speed is simply made to reach the desired value within the desired time or within the travel stroke range of the injection cylinder. This is a cylinder speed control method for injection molding equipment, etc.
そして、本実施例によるシリンダの制御領域
を、主として射出シリンダ１０の一射出工程であ
る溶融物質のキヤビテイ充填領域に適用した場合
には、特に効果を発揮させることができる。 When the cylinder control area according to this embodiment is applied mainly to the cavity filling area of the molten material, which is one injection process of the injection cylinder 10, it can be particularly effective.
即ち、本実施例はパルスモータ駆動による極め
て応答性の高い流量制御弁３０を用い、射出速度
及び射出速度の変化率を制御し、射出成形品の形
状に適した射出速度により射出成形を行なうこと
ができ、特に充填区間T2の射出速度を検出する
ことにより設定した射出速度及び射出変化率との
誤差を修正して充填区間の射出速度及び加速状態
を制御し、以て最終射出速度V3を所望の値とす
ることができるものであつて、例えば厚肉にして
深物となる成形品の場合には、第３図に示す如く
充填区間の後半において増進し、最終射出速度
V3を高めることにより溶湯への圧力伝播を増大
させて寸法精度の向上、所要の製品強度を得るこ
とができ、又、薄物の製品を成形する場合には、
一旦、充填区間で増進した後、充填区間の後半に
おいて減速し、最終射出速度を低く押えることに
より溶湯のバリ吹きを押え以て事後処理を簡素化
することができる等、所望の射出速度により品質
の高い射出成形品を得ることができる利点があ
る。 That is, in this embodiment, the injection speed and the rate of change of the injection speed are controlled by using the extremely responsive flow control valve 30 driven by a pulse motor, and injection molding is performed at an injection speed suitable for the shape of the injection molded product. In particular, by detecting the injection speed in the filling section T2 , the error with the set injection speed and injection change rate is corrected, and the injection speed and acceleration state in the filling section are controlled, thereby achieving the final injection speed V3 . For example, in the case of thick-walled and deep molded products, the final injection speed increases in the latter half of the filling section as shown in Figure 3.
By increasing V3 , it is possible to increase the pressure propagation to the molten metal, improve dimensional accuracy, and obtain the required product strength.In addition, when molding thin products,
Once the injection speed is increased in the filling section, it is decelerated in the second half of the filling section, and by keeping the final injection speed low, it is possible to suppress the burr blowing of the molten metal and simplify post-processing. It has the advantage of being able to obtain injection molded products with high quality.
本発明は、前述の如く千分の１秒単位で応答す
る流量制御弁３０を用いることにより溶湯を射出
スリーブからキヤビテイへ押出す低速射出区間
T1は勿論、キヤビテイ内へ溶湯を充満させる充
填区間T2の高速射出速度及び射出速度の増減特
性をも制御し得ることとなり、本発明はこの様な
高速且つ正確な流量制御弁３０を用いる射出成形
に際し、射出速度をキヤビテイの形状に合せて制
御し、且つ、高速射出速度への速度変化特性を検
出して所望の速度変更が達成できないと判断され
るときは直ちに流量制御弁の制御に修正を加える
故、キヤビテイの形状、大きさに適した射出成形
を常に行ない、製品の精度、強度を高く維持し、
高品質の射出成形品を継続的に製造し得る方法で
ある。
As described above, the present invention utilizes a low-speed injection section in which molten metal is pushed from an injection sleeve into a cavity by using a flow control valve 30 that responds in units of one-thousandth of a second.
It is possible to control not only T 1 but also the high-speed injection speed and the increase/decrease characteristics of the injection speed of the filling section T 2 for filling the cavity with molten metal, and the present invention uses such a high-speed and accurate flow rate control valve 30. During injection molding, the injection speed is controlled according to the shape of the cavity, and when the speed change characteristics to a high injection speed are detected and it is determined that the desired speed change cannot be achieved, the flow rate control valve is immediately controlled. Since we make modifications, we always perform injection molding that is suitable for the shape and size of the cavity, maintaining high precision and strength of the product.
This method allows continuous production of high-quality injection molded products.
第１図は本発明に使用するパルスモータ駆動に
よる高速応答の流量制御弁の一例を示す縦断面
図、第２図は本発明の方法を実施するブロツク
図、第３図は全射出区間の射出速度変化を表わす
線図、第４図乃至第６図はそれぞれ流量制御弁の
制御信号における異なる波形を表わす線図、第７
図及び第８図はそれぞれ流量制御弁による射出速
度の変化を表わす線図である。
１０……射出シリンダ、１１……シリンダロツ
ド、１２……ストライカ、１３……リミツトスイ
ツチ、１５……射出スリーブ、１７……プランジ
ヤチツプ、２１……位置演算器、２２……位置設
定器、２５……制御弁制御装置、２６……立上り
時間設定器、３０……流量制御弁。
Fig. 1 is a longitudinal sectional view showing an example of a high-speed response flow rate control valve driven by a pulse motor used in the present invention, Fig. 2 is a block diagram for implementing the method of the present invention, and Fig. 3 is a diagram showing injection of all injection sections. Diagrams representing speed changes, Figures 4 to 6 are diagrams representing different waveforms in the control signal of the flow control valve, respectively.
8 and 8 are diagrams each showing changes in injection speed due to the flow rate control valve. 10... Injection cylinder, 11... Cylinder rod, 12... Striker, 13... Limit switch, 15... Injection sleeve, 17... Plunger tip, 21... Position calculator, 22... Position setter, 25... Control valve control device, 26... rise time setting device, 30... flow rate control valve.
Claims (1)
液量又はシリンダからの排出液量を高速応答性を
有する流量制御弁で調整してシリンダ速度を所望
の値に設定及び変更することにより所定の最終高
速射出速度に至らしめることとし、低速射出速度
から高速射出速度への速度変化率を検出し、予め
定められた流量制御弁の開度変化の加減速特性で
は、速度の変化に要する所望の時間内もしくは所
望のシリンダ移動におけるストローク量の範囲内
で、所望の速度変更が達成できないと判断された
場合には、直ちに前記流量制御弁の開度変化の加
減速特性を変更してシリンダ速度を所望値まで到
達させる様にした射出成形装置等のシリンダ速度
制御方法。1 By adjusting the amount of hydraulic oil supplied to the cylinder of injection molding equipment, etc. or the amount of liquid discharged from the cylinder using a flow control valve with high-speed response, and setting and changing the cylinder speed to a desired value, a predetermined value can be achieved. The speed change rate from the low injection speed to the high injection speed is detected, and the predetermined acceleration/deceleration characteristics of the opening degree change of the flow rate control valve are determined to reach the final high injection speed. If it is determined that the desired speed change cannot be achieved within the time or stroke amount range of the desired cylinder movement, the cylinder speed is changed by immediately changing the acceleration/deceleration characteristics of the opening degree change of the flow control valve. A cylinder speed control method for injection molding equipment, etc. that allows the speed to reach a desired value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8525783A JPS59229271A (en) | 1983-05-16 | 1983-05-16 | Method for controlling cylinder speed of injection molding device or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8525783A JPS59229271A (en) | 1983-05-16 | 1983-05-16 | Method for controlling cylinder speed of injection molding device or the like |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59229271A JPS59229271A (en) | 1984-12-22 |
| JPH0261347B2 true JPH0261347B2 (en) | 1990-12-19 |
Family
ID=13853513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8525783A Granted JPS59229271A (en) | 1983-05-16 | 1983-05-16 | Method for controlling cylinder speed of injection molding device or the like |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59229271A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6167558A (en) * | 1984-09-10 | 1986-04-07 | Toshiba Mach Co Ltd | Method for setting injection speed of die casting machine |
| JPS6228221A (en) * | 1985-07-30 | 1987-02-06 | Niigata Eng Co Ltd | Controlling device in injection molder |
| JP2597913B2 (en) * | 1989-10-04 | 1997-04-09 | ファナック株式会社 | Injection speed control method for electric injection molding machine |
| JP5673482B2 (en) * | 2011-10-19 | 2015-02-18 | 株式会社豊田自動織機 | Injection device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56131062A (en) * | 1980-03-19 | 1981-10-14 | Hitachi Ltd | Shot plunger speed controlling method of die-casting machine |
-
1983
- 1983-05-16 JP JP8525783A patent/JPS59229271A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56131062A (en) * | 1980-03-19 | 1981-10-14 | Hitachi Ltd | Shot plunger speed controlling method of die-casting machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59229271A (en) | 1984-12-22 |
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