JPH0310428B2 - - Google Patents
Info
- Publication number
- JPH0310428B2 JPH0310428B2 JP58080530A JP8053083A JPH0310428B2 JP H0310428 B2 JPH0310428 B2 JP H0310428B2 JP 58080530 A JP58080530 A JP 58080530A JP 8053083 A JP8053083 A JP 8053083A JP H0310428 B2 JPH0310428 B2 JP H0310428B2
- Authority
- JP
- Japan
- Prior art keywords
- change
- rate
- speed
- cylinder speed
- 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 - Lifetime
Links
- 238000002347 injection Methods 0.000 claims description 82
- 239000007924 injection Substances 0.000 claims description 82
- 238000001746 injection moulding Methods 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- 230000005856 abnormality Effects 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 description 13
- 239000010720 hydraulic oil Substances 0.000 description 6
- 238000012937 correction Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000009931 harmful 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機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監
視及び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 monitoring and 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. It is something.
［従来の技術］
一般にダイカスト等の射出成形においては、金
型におけるキヤビテイ形状、容積、金型の温度等
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、又、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。[Prior Art] Generally, in injection molding such as die casting, the injection speed, injection pressure, etc. of molten metal must be appropriately determined depending on the cavity shape and volume of the mold, the temperature of the mold, etc. This is because if the injection speed, injection pressure, etc. are inappropriate, the flow of hot water into the cavity is poor, which may cause chips or cavities in the cast product, or may reduce dimensional accuracy and product strength. This is because various harmful effects occur.
ところでシヨツトプランジヤの射出速度Ｖは、
例えば、第１図に示す如く、初期の低速射出速度
V1と後期の高速射出速度VP2との２期に大きく
区分することができる。この初期の低速射出速度
区間は溶湯を射出スリーブ内に充填し、プランジ
ヤチツプにて溶湯をキヤビテイ内へ押出す際に射
出スリーブの溶湯注入口から射出スリーブ外へ溶
湯を逆流噴出させない為、又、溶湯がキヤビテイ
に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噴出し、キヤビテイ
内のガス（空気）が溶湯と混じることを防止する
た為に溶湯を低圧低速で射出するものであり、高
速射出速度区間は溶湯がキヤビテイに到達した
後、一気に溶湯をキヤビテイ内に充満させ、製品
の欠落、及び寸法精度を低下等を防止する為に高
圧高速で溶湯を射出するものである。 By the way, the injection speed V of the shot plunger is
For example, as shown in Figure 1, the initial low injection speed
It can be broadly divided into two periods: V 1 and the latter period of high injection speed VP 2 . This initial low injection speed section is used to fill the injection sleeve with molten metal and prevent the molten metal from backflowing out of the injection sleeve from the molten metal inlet of the injection sleeve when the plunger tip pushes the molten metal into the cavity. When the molten metal reaches the cavity, it is ejected from the runner, which is a narrow gap, into the cavity, which is a relatively wide space, and the molten metal is injected at low pressure and speed to prevent the gas (air) in the cavity from mixing with the molten metal. In the high-speed injection speed section, after the molten metal reaches the cavity, the cavity is filled with molten metal at once, and the molten metal is injected at high pressure and high speed to prevent missing products and decrease in dimensional accuracy. It is.
この低速射出速度V1及び高速射出速度V2を含
め、射出成形装置における溶湯の射出時間は一般
に数秒と短く、特に低速射出速度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為、従来は例えば高速射出
速度区間における所定位置等プランジヤチツプの
移動範囲内の１箇所又は２箇所の特定位置にて射
出速度又は射出圧力を測定、監視し、前記製品の
欠落、巣の発生、精度の低下等を防止する為、作
動油の油圧を修正することが行なわれていた。 Including this low injection speed V 1 and high injection speed V 2 , the injection time of molten metal in an injection molding device is generally as short as several seconds, and especially the rise time from low injection speed V 1 to high injection speed V 2 is several hundredths of a second. Conventionally, injection speed or injection pressure is measured and monitored at one or two specific positions within the movement range of the plunger tip, such as a predetermined position in a high injection speed section. In order to prevent the above-mentioned products from missing, the occurrence of cavities, and a decrease in accuracy, the hydraulic pressure of the hydraulic oil has been corrected.
［発明が解決しようとする課題］
前述の様に、従来は多くの場合にプランジヤチ
ツプの特定点における速度及び射出圧力を測定し
ているも、プランジヤチツプのかじり等により生
じる射出速度の異常変調は一定速度区間の定点測
定では必ずしも異常を正確に感知できず、不充分
な場合が多い欠点があつた。[Problems to be Solved by the Invention] As mentioned above, in the past, the velocity and injection pressure at a specific point of the plunger tip were measured in many cases, but abnormal modulation of the injection velocity caused by galling of the plunger tip, etc. Fixed-point measurements in a constant speed section have the disadvantage that abnormalities cannot always be detected accurately and are often insufficient.
［課題を解決するための手段］
本発明は流量制御弁を用いて低速射出速度V1
及び高速射出速度V2等射出用シリンダ前進速度
即ちプランジヤチツプの前進速度を制御するもの
とし、低速射出速度から高速射出速度への立上り
区間で測定を行なつて変化率を測定し、測定値と
制定値とを比較し、測定値が制定値よりも小さい
とき、測定値と設定値との差が微小な場合は修正
し、差が大きい場合は射出成形を停止させる様に
した射出成形装置のシリンダ射出速度を監視及び
制御する方法である。[Means for Solving the Problems] The present invention uses a flow control valve to control the low injection speed V 1
and high-speed injection speed V. The forward speed of the cylinder for secondary injection, that is, the forward speed of the plunger tip, shall be controlled.Measurement is performed in the rising section from low-speed injection speed to high-speed injection speed, the rate of change is measured, and the measured value and An injection molding machine that compares the measured value with the set value and corrects it if the difference between the measured value and the set value is small, and stops injection molding if the difference is large. A method of monitoring and controlling cylinder injection speed.
［作用］
本発明は低速射出速度から高速射出速度への変
化率を測定し、測定値が設定値と異なる場合に流
量制御弁を調整して高速射出速度への立ち上りを
設定値に合わせる故、常に所定の高速射出速度に
より射出成形を行なうことができる。[Function] The present invention measures the rate of change from low injection speed to high injection speed, and when the measured value differs from the set value, adjusts the flow control valve to match the rise to the high injection speed to the set value. Injection molding can always be performed at a predetermined high injection speed.
［実施例］
本発明の実施例では、第２図に示す如く、射出
プランジヤ１５の先端部のプランジヤチツプ１６
を射出スリーブ中に摺動自在に設け、プランジヤ
チツプ１６を前後進させる射出シリンダ１０に対
し、プランジヤチツプ１６の位置及び速度を検出
すべくシリンダロツド１１の位置検出器２２及び
速度検出器２１を設ける。該位置検出器２２から
発せられる位置検出信号は位置演算器２４へ送ら
れ、該位置演算器２４は該位置検出信号に基いて
射出シリンダ１０のストローク位置を算出すると
共に、位置設定器２３に設定された所定位置にシ
リンダロツド１１が達した時、油圧ポンプ３０か
ら射出シリンダ１０への油圧回路に設けられる流
量制御弁２９の制御装置２７へ立上り信号を送信
する。従つて前記位置設定器２３は溶湯の押出し
速度である低速射出速度V1から高速射出速度V2
への立上り位置を設定するものであり、該位置設
定器２３から発せられる設定位置信号と、前記位
置検出器２２から発せられる位置検出信号に基い
て位置演算器２４内で算出される測定位置信号と
を位置演算器２４内で比較し、位置設定器２３で
設定された位置にシリンダロツド１１が達したと
き、前記の如く位置演算器２４から立上り信号が
発信されるのである。[Embodiment] In an embodiment of the present invention, as shown in FIG.
is slidably provided in an injection sleeve, and an injection cylinder 10 that moves a plunger tip 16 back and forth is provided with a position detector 22 and a speed detector 21 of the cylinder rod 11 to detect the position and speed of the plunger tip 16. The position detection signal emitted from the position detector 22 is sent to the position calculator 24, and the position calculator 24 calculates the stroke position of the injection cylinder 10 based on the position detection signal, and also sets it in the position setting device 23. When the cylinder rod 11 reaches the predetermined position, a rising signal is sent to the control device 27 of the flow control valve 29 provided in the hydraulic circuit from the hydraulic pump 30 to the injection cylinder 10. Therefore, the position setting device 23 changes the extrusion speed of the molten metal from the low injection speed V1 to the high injection speed V2.
The measurement position signal is calculated in the position calculator 24 based on the set position signal emitted from the position setting device 23 and the position detection signal emitted from the position detector 22. When the cylinder rod 11 reaches the position set by the position setting device 23, a rising signal is transmitted from the position calculation device 24 as described above.
この立上り信号を受ける流量制御弁装置２７
は、第３図に示す如く、低速射出速度V1の値、
高速射出速度V2への立上り所要時間tsの値をも
任意に設定し得る制御装置２７であり、前述の立
ち上り信号を受けた場合に制定された立上り所要
時間tsをもつて設定された高速射出速度V2にプ
ランジヤチツプ１６が達する様に流量制御弁２９
の開度と開き速度とを制御する。 Flow control valve device 27 that receives this rising signal
is the value of low injection speed V 1 as shown in Fig. 3,
The control device 27 is capable of arbitrarily setting the value of the required rise time ts to the high-speed injection speed V2 , and the high-speed injection is set with the required rise time ts established when the above-mentioned rise signal is received. Flow control valve 29 so that plunger tip 16 reaches speed V 2
The opening degree and opening speed are controlled.
ここにおいて、流量制御弁２９としては、例え
ば第５図に示す様な、パルスモータ駆動による流
量制御弁を用いる。 Here, as the flow rate control valve 29, for example, a flow rate control valve driven by a pulse motor as shown in FIG. 5 is used.
第５図に示す流量制御弁２９において、４１は
軸線方向からの作動油流入口４２と、軸線と直角
方向への作動油流出口４３とを有するバルブボデ
イ、４４はバルブボデイ４１中を軸線方向へ移動
する弁スプール、４５は弁スプール４４の後部に
一体に連結されているナツト軸、４６はナツト軸
４５の内部軸心部にボールねじ４７によつて螺合
されているねじ軸、４８はねじ軸４６の後部歯車
４９に噛合わされているピニオンギヤ、５０は回
転量を制御可能なパルスモータ、５１はキーであ
り、パルスモータ５０の回転に応じて弁スプール
４４が軸線方向に前後進して、弁の開閉と開度の
調整を瞬時に行ない、圧油等の流量制御を行な
う。この流量制御弁２９は、前記した様に、軸線
方向端面部に作動油流入口４２を備え、側面に作
動油流出口４３を備えたシリンダ状のバルブボデ
イ４１内で、弁スプール４４をパルスモータ５０
の作用によつて軸線方向に駆動して流量制御を行
なうもので、作動油による弁スプール４４軸線方
向推力を弁スプール４４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
高速切換えに必要な駆動力を軽減させ、流動制御
弁２９による流量の高速切換え性能の一層の向上
及び駆動力の軽減を行なえる様にしたものであ
る。 In the flow control valve 29 shown in FIG. 5, 41 is a valve body having a hydraulic oil inlet 42 from the axial direction and a hydraulic oil outlet 43 perpendicular to the axis, and 44 moves in the axial direction in the valve body 41. 45 is a nut shaft integrally connected to the rear part of the valve spool 44; 46 is a screw shaft screwed into the inner shaft center of the nut shaft 45 by a ball screw 47; 48 is a screw shaft 46 is a pinion gear meshed with a rear gear 49; 50 is a pulse motor whose rotation amount can be controlled; 51 is a key; the valve spool 44 moves back and forth in the axial direction in accordance with the rotation of the pulse motor 50, and the valve Instantly open/close and adjust the opening degree to control the flow rate of pressurized oil, etc. As described above, this flow rate control valve 29 has a valve spool 44 connected to a pulse motor 50 within a cylindrical valve body 41 having a hydraulic oil inlet 42 at the end face in the axial direction and a hydraulic oil outlet 43 at the side surface.
This device controls the flow rate by driving the valve spool 44 in the axial direction by the action of This reduces the driving force required for high-speed switching, further improving the performance of high-speed flow rate switching by the flow control valve 29 and reducing the driving force.
この流量制御弁２９では、流量制御弁制御装置
２７からの指令信号により、パルスモータ５０の
開き量が決定され、射出シリンダ１０への流量が
制御され、又、パルスモータ５０の前記回転の際
の回転速度の大小によつて流量の変化率即ち速度
の立上り状態が決まる。 In this flow rate control valve 29, the opening amount of the pulse motor 50 is determined by the command signal from the flow rate control valve control device 27, the flow rate to the injection cylinder 10 is controlled, and the amount of opening of the pulse motor 50 is controlled. The rate of change of the flow rate, that is, the rising state of the speed, is determined by the magnitude of the rotational speed.
尚、この様ない構造と作用とをもたせた流量制
御弁２９では、速度変更の指令を受けて実際に弁
スプール４４が開き始めるまでの時間t1を最大１
ミリ秒以下に押えることができる様になり、従来
の通常の流量制御弁に比べて、応答性が極めて良
く、又、弁開閉等の作動性や操作精度も極めて良
くなつた。 In addition, in the flow control valve 29 having such an unusual structure and operation, the time t 1 from when the valve spool 44 actually starts to open after receiving a command to change the speed can be set to a maximum of 1.
It is now possible to control the flow rate within milliseconds, and compared to conventional ordinary flow control valves, the response is extremely good, and the operability and operational precision of opening and closing the valve are also extremely improved.
尚、ナツト軸４５の表面の一部には永久磁石５
２を固定し、この永久磁石５２と対向ケーシング
５３の一部には、例えばゼロクロスセンサと呼ば
れる磁気作用による位置検出器５４を取付けてい
る。この位置検出器５４は永久磁石５２の移動に
感応する近接スイツチで構成し、ナツト軸４５や
弁スプール４４の軸線方向の移動距離をここで正
確に検知して、制御装置にフイードバツクできる
様にしている。又、弁スプール４４の零位置を永
久磁石５２と位置検出器５４の作用によつて電気
的に検知し、流量制御弁制御装置２７を介してパ
ルスモータ５０をその位置に正確に止めておくこ
とができる様にしている。尚、位置検出器５４と
しては、精度が0.01mmのものを用いる様にした。 In addition, a permanent magnet 5 is attached to a part of the surface of the nut shaft 45.
2 is fixed, and a magnetic position detector 54 called a zero cross sensor is attached to a part of the permanent magnet 52 and the opposing casing 53, for example. This position detector 54 is composed of a proximity switch that is sensitive to the movement of the permanent magnet 52, and is designed to accurately detect the axial movement distance of the nut shaft 45 and valve spool 44 and provide feedback to the control device. There is. Further, the zero position of the valve spool 44 is electrically detected by the action of the permanent magnet 52 and the position detector 54, and the pulse motor 50 is accurately stopped at that position via the flow rate control valve control device 27. I am trying to make it possible. Note that the position detector 54 used has an accuracy of 0.01 mm.
上述の如き構造の流量制御弁２９を用いて射出
シリンダ１０の速度を制御し、他方、溶湯の射出
速度、即ちプランジヤチツプ１６の速度を検出す
べく設けた前記シリンダロツド１１の速度検出器
２１からは速度検出信号が速度演算器２５へ送信
し、該速度演算器２５において速度検出信号に基
いてプランジヤチツプの射出速度を算出し、測定
速度信号として速度比較器２６へ送信する。 The speed of the injection cylinder 10 is controlled using the flow rate control valve 29 having the structure described above, while the speed detector 21 of the cylinder rod 11 is provided to detect the injection speed of the molten metal, that is, the speed of the plunger tip 16. The speed detection signal is sent to the speed calculator 25, which calculates the injection speed of the plunger tip based on the speed detection signal and sends it to the speed comparator 26 as a measured speed signal.
この速度比較器２６へは、該測定速度信号を速
度演算器２５から入力する他、位置演算器２４か
ら制御装置２７に送られる前述の立上り信号、及
び制御装置２７からは制御装置内で設定された立
上り所要時間tsと設定された高速射出速度V2と
の信号を入力する。そして該速度比較器２６は制
御装置２７からの設定高速射出速度信号と速度演
算器２５からの測定速度信号を比較し、プランジ
ヤチツプ１６の射出速度が設定高速射出速度V2
に達する時点を算出すると共に前記位置演算器２
４からの立上り信号受信から該プランジヤチツプ
１６の射出速度が設定高速射出速度V2に達する
迄の所要時間tk（第４図参照）を計測し、この計
測した所要時間tkと制御装置２７から送信された
設定立上り所要時間信号に基く設定立上り所要時
間tsとを比較する。 In addition to inputting the measured speed signal from the speed calculator 25 to the speed comparator 26, the above-mentioned rising signal sent from the position calculator 24 to the control device 27, and the signal set within the control device from the control device 27 are input. Input the signals of the required rise time ts and the set high speed injection speed V2 . The speed comparator 26 compares the set high-speed injection speed signal from the control device 27 with the measured speed signal from the speed calculator 25, and determines whether the injection speed of the plunger tip 16 is the set high-speed injection speed V 2
The position calculator 2 calculates the point in time when the
The time tk (see FIG. 4) required for the injection speed of the plunger tip 16 to reach the set high-speed injection speed V 2 from the reception of the rising signal from the plunger tip 4 is measured, and the measured time tk and the time tk are transmitted from the control device 27. The set rise time ts based on the set rise time required signal is compared.
そして、この速度比較器２６は設定立上り所要
時間tsに対し、測定した時間tkが長い場合には次
回の射出時における流量制御弁２９の開閉速度を
早める様に設定立上り所要時間tsを短く設定修正
する如く流量制御弁制御装置２７へ修正信号を送
信するものであり、又、測定した所要時間tkが設
定立上り所要時間tsち対し長すぎる場合には射出
シリンダ１０の作動を停止させるべく警報装置２
８へ警報信号を送り、該警報装置２８の作動によ
り適宜射出操作を停止させる。 Then, if the measured time tk is longer than the set rise time ts, the speed comparator 26 corrects the set rise time ts to shorten it so as to accelerate the opening/closing speed of the flow control valve 29 during the next injection. If the measured required time tk is too long than the set rising time ts, an alarm device 2 is sent to stop the operation of the injection cylinder 10.
8, and the injection operation is appropriately stopped by activation of the alarm device 28.
尚、流量制御弁２９は第２図に示す如く射出シ
リンダ１０のピストン後室１２への送油回路に設
け、以て送油量を制御する場合に限ることなく、
ピストン前室１３から油槽３１へのドレイン回路
に設け、射出シリンダ１０からの排出湯量を制御
し、以てシリンダロツド１１の速度を制御する場
合もある。 Note that the flow rate control valve 29 is not limited to the case where the oil supply circuit to the piston rear chamber 12 of the injection cylinder 10 is provided as shown in FIG. 2 to control the amount of oil supplied.
In some cases, it is provided in the drain circuit from the piston front chamber 13 to the oil tank 31 to control the amount of hot water discharged from the injection cylinder 10, thereby controlling the speed of the cylinder rod 11.
又、制御弁制御装置２７の設定立上り所要時間
tsに関し、第４図に示す如く、該射出シリンダ１
０における立上り遅れ時間t1及び立上り完了時間
ts諸特性を予め実測し、流量制御弁２９を操作し
た場合のプランジヤチツプ１６の速度即ち溶湯の
射出速度の追従生を適確に把握しておく。これ
は、立上り所要時間tsは一般に数十乃至数百ミリ
秒と極めて短時間であり、この短時間で数十cm／
秒の低速から数ｍ／秒の高速度に急加速する故、
射出シリンダ１０を作動させる油圧の粘性や圧縮
性及び圧油や他の機械的可動部分の慣性等により
立上り遅れ時間が生じ、この立上り遅れ時間t1及
び立上り所要時間ts諸特性は、射出シリンダ１０
の油圧回路系が定まれば一義的に定まるからであ
る。 In addition, the required start-up time of the control valve control device 27
Regarding ts, as shown in Fig. 4, the injection cylinder 1
Rise delay time t 1 and rise completion time at 0
The various ts characteristics are measured in advance, and the velocity of the plunger tip 16, that is, the following behavior of the molten metal injection velocity when the flow rate control valve 29 is operated, is accurately grasped. This is because the rise time ts is generally extremely short, tens to hundreds of milliseconds, and in this short time, tens of cm/
Because it rapidly accelerates from a low speed of seconds to a high speed of several meters/second,
A start-up delay time occurs due to the viscosity and compressibility of the hydraulic pressure that operates the injection cylinder 10 and the inertia of the pressure oil and other mechanically movable parts.
This is because it is uniquely determined once the hydraulic circuit system of is determined.
尚、立上り所要時間tsは、速度V1、V2及び立
上り度合即ち速度変化のパターン、更に好ましく
は作動油の圧力や温度の函数として予め定めてお
くことができる。 Note that the required rise time ts can be predetermined as a function of the speeds V 1 and V 2 and the rise degree, that is, the speed change pattern, and more preferably as a function of the pressure and temperature of the hydraulic oil.
この様にして、予め把握した特性により流量制
御弁制御装置２７に点則射出速度V1、高速射出
速度V2及び立上り所要時間tsを設定し、前述の
如く速度比較器２６にて設定立上り所要時間tsと
測定立上り所要時間tkとを比較すれば、測定立上
り所要時間tkの設定立上り所要時間tsに対する遅
れはプランジヤチツプ１６のかじり等射出プラン
ジヤ１５の異常、又は、射出シリンダ１０の異常
等によるプランジヤチツプの前進即ちシリンダロ
ツド１１の前進に対する抵抗の増大を意味し、射
出成形装置に異常が生じたことを判別し得る。 In this way, the point rule injection speed V 1 , high-speed injection speed V 2 , and required rise time ts are set in the flow rate control valve control device 27 based on the characteristics grasped in advance, and the required rise time ts is set using the speed comparator 26 as described above. Comparing the time ts and the measured rising time tk, the delay in the measured rising time tk with respect to the set rising time ts is due to an abnormality in the injection plunger 15 such as galling of the plunger tip 16, or an abnormality in the injection cylinder 10. This means an increase in resistance to the advancement of the chip, that is, the advancement of the cylinder rod 11, and can be used to determine that an abnormality has occurred in the injection molding apparatus.
尚、前述の設定立上り所要時間tsと測定立上り
所要時間tkの比較は立上り完了時間をもつて比較
したが、必要に応じ立上り遅れ時間t1をも測定値
と設定値とをもつて比較することができる。 Note that the above-mentioned comparison of the set rise time ts and measured rise time tk was based on the rise completion time, but if necessary, the rise delay time t1 may also be compared using the measured value and the set value. Can be done.
そして、測定値と設定値との比較は射出成形装
置の安全率等をも考慮し、例えば、測定値が設定
値に対し100％（一致状態）乃至105％未満の異常
の場合は何ら修正を必要とすることなく、射出成
形を継続して繰り返すこととし、105％乃至120％
未満となる場合には異常は軽微である故、適宜速
度比較器２６から制御弁制御装置２７に対して設
定立上り所要時間tsを短くすべく修正信号を送信
して射出成形を継続するものとし、120％乃至130
％未満の場合には制御弁制御装置２７に修正信号
を送信すると共に警報装置２８へ警報信号を送
り、以て装置の異常を知らせるものとし、測定立
上り所要時間が設定立上り所要時間130％以上の
場合には異常が重大であるとして射出成形装置を
緊急停止させることにより事故を未然に防止する
こともできる。 When comparing the measured value and the set value, take into consideration the safety factor of the injection molding equipment. For example, if the measured value is less than 100% (matching state) or 105% of the set value, no corrections should be made. Injection molding is continuously repeated without the need for 105% to 120%
If it is less than ts, the abnormality is minor, so a correction signal is sent from the speed comparator 26 to the control valve control device 27 to shorten the set rise time ts, and injection molding is continued. 120% to 130
If it is less than %, a correction signal will be sent to the control valve control device 27 and an alarm signal will be sent to the alarm device 28 to notify the device of an abnormality. In some cases, accidents can be prevented by determining that the abnormality is serious and stopping the injection molding apparatus in an emergency.
尚、一般に立上り速度は早ければ早い程良いと
されているので、測定立上り所要時間が設定立上
り所要時間の100％未満である場合は、何ら修正
しなくても良いし、或は、100％になる様に修正
しても良い。 In addition, it is generally said that the faster the rise speed, the better, so if the measured rise time is less than 100% of the set rise time, there is no need to make any corrections, or it may be set to 100%. You can modify it as you see fit.
本実施例は、上述の如くシリンダ１０への供給
液量又はシリンダ１０からの排出液量を流量制御
弁２９にて調整し、シリンダ速度を所望の低速射
出速度V1から所望の高速射出速度V2に変化せし
める場合に、測定立上り所要時間tkとしてシリン
ダ速度の変化率即ち、速度変化のパターンを検知
し、該測定変化率が前記流量制御弁２９とシリン
ダ１０とを含む液圧回路系固有の流量増減特性か
ら換算される設定立上り所要時間tsたるシリンダ
速度の設定変化率と比較し、前記測定変化率に対
して異なる場合をもつて異常と判断することを特
徴とする射出成形装置のシリンダ速度制御監視方
法である。 In this embodiment, as described above, the amount of liquid supplied to the cylinder 10 or the amount of liquid discharged from the cylinder 10 is adjusted by the flow control valve 29, and the cylinder speed is changed from a desired low injection speed V1 to a desired high injection speed V1. 2 , the rate of change in cylinder speed, that is, the pattern of speed change, is detected as the measured rising time tk, and the measured rate of change is determined by the characteristic of the hydraulic circuit system including the flow rate control valve 29 and the cylinder 10. The cylinder speed of an injection molding apparatus is characterized in that the cylinder speed is compared with a set change rate of the cylinder speed which is a set rising time ts converted from flow rate increase/decrease characteristics, and is determined to be abnormal if it differs from the measured change rate. This is a control and monitoring method.
この様に測定変化率が流量増減特性から換算さ
れる設定変化率に対する差異、即ち遅れをもつて
プランジヤチツプ１６等に加わる抵抗増大等の異
常を発見する方法である故、射出装置の異常を容
易に識別し得る。 In this way, the measured rate of change is a difference from the set rate of change converted from the flow rate increase/decrease characteristics, that is, the method detects abnormalities such as an increase in resistance applied to the plunger tip 16 etc. with a delay, so it is easy to detect abnormalities in the injection device. can be identified.
又、測定変化率を設定変化率と比較するに際
し、例えば設定変化率の100％乃至105％未満、
105％乃至120％未満、120％以上に区分する様に
閾値を設け、測定変化率の設定変化率に対する遅
れが零、即ち測定立上り所要時間が設定立上り所
要時間と一致する場合乃至測定変化率の約105％
未満となる場合には、何らの修正をすることなく
射出成形を繰返し、測定変化率が設定変化率の約
105％乃至120％未満となる場合には、流量制御弁
２９の開度変化の度合を調整することにより立上
り所要時間を短く、即ち変化率を大きくする如く
修正することにより所望の射出速度変化を達成
し、射出成形品の欠落、巣の発生、寸法精度の低
下等種々の成品欠陥を効率良く防止し得る方法で
あり、更に測定変化率が設定変化率に対し約120
％以上と大きく遅れる場合には警報を発し、又流
量制御弁２９を閉じ、射出成形装置を停止せしめ
て事故の発生を防止し得る等有用な方法である。 Also, when comparing the measured rate of change with the set rate of change, for example, if the rate of change is less than 100% or 105% of the set rate of change,
A threshold value is set to classify the rate of change from 105% to less than 120% and 120% or more, and if the delay of the measured rate of change with respect to the set rate of change is zero, that is, the time required for the measurement rise matches the set time required for the rise, or the measured rate of change is Approximately 105%
If the rate of change is less than the set rate of change, repeat the injection molding without making any corrections until the measured rate of change is approximately the set rate of change.
If it is less than 105% to 120%, the desired injection speed change can be achieved by adjusting the degree of change in the opening of the flow rate control valve 29 to shorten the required start-up time, that is, to increase the rate of change. It is a method that can efficiently prevent various product defects such as chipping of injection molded products, occurrence of cavities, and decrease in dimensional accuracy.Furthermore, the measured change rate is about 120% of the set change rate.
If there is a significant delay of more than %, this is a useful method that can issue an alarm, close the flow rate control valve 29, and stop the injection molding apparatus to prevent accidents from occurring.
［発明の効果］
本発明は、流量制御弁にて射出シリンダへの液
量を制御し、且つ、低速射出から高速射出への変
化率を検出し、測定変化率と設定変化率とを比較
して流量制御弁を調整し、以て流量制御弁の変化
率を修正する射出成形装置のシリンダ速度監視制
御方法である故、速度射出速度を常に所定とし、
製品における巣の発生や精度の低下等を防止する
ことができる。[Effects of the Invention] The present invention controls the amount of liquid to the injection cylinder using a flow control valve, detects the rate of change from low-speed injection to high-speed injection, and compares the measured rate of change with the set rate of change. Since this is a cylinder speed monitoring and control method for an injection molding apparatus in which the flow rate control valve is adjusted by adjusting the rate of change of the flow rate control valve, the injection speed is always kept at a predetermined value.
It is possible to prevent the occurrence of cavities in the product and a decrease in accuracy.
第１図は射出成形機におけるシリンダの射出速
度の概要を表わす図にして、第２図は本発明に係
る方法を実施するブロツク図、第３図及び第４図
は射出速度の変化を表わす図であり、第５図は本
発明に使用する流量制御弁の一例を示す図であ
る。
１０＝射出シリンダ、１１＝シリンダロツド、
１４＝射出スリーブ、１５＝射出プランジヤ、１
６＝プランジヤチツプ、２１＝速度検出器、２２
＝位置検出器、２３＝位置設定器、２４＝位置演
算器、２５＝速度演算器、２６＝速度比較器、２
７＝流量制御弁制御装置、２８＝警報装置、２９
＝流量制御弁、３０＝油圧ポンプ、５０＝パルス
モータ。
Fig. 1 is a diagram showing an overview of the injection speed of a cylinder in an injection molding machine, Fig. 2 is a block diagram for implementing the method according to the present invention, and Figs. 3 and 4 are diagrams showing changes in the injection speed. FIG. 5 is a diagram showing an example of a flow control valve used in the present invention. 10=injection cylinder, 11=cylinder rod,
14=injection sleeve, 15=injection plunger, 1
6=plunger tip, 21=speed detector, 22
= position detector, 23 = position setter, 24 = position calculator, 25 = speed calculator, 26 = speed comparator, 2
7=Flow control valve control device, 28=Alarm device, 29
=Flow control valve, 30=Hydraulic pump, 50=Pulse motor.
Claims (1)
出液量を流量制御弁にて調整し、スリーブ内に溶
湯を充満させる低速射出時からキヤビテイ内に溶
湯を充填する高速射出速度にシリンダ速度を変化
せしめる際に、シリンダ速度の変化率を検出し、
この検出した測定変化率を前記流量制御弁とシリ
ンダとを含む液圧回路系固有の流量増減特性から
換算されるシリンダ速度の設定変化率と比較し、
前記測定変化率が設定変化率と異なる場合は異常
と判断し、測定変化率が設定変化率よりも小さい
場合には流量制御弁の変化率を大きする様に調整
して次回の射出を行なうことを特徴とする射出成
形装置のシリンダ速度監視制御方法。 ２ 計測したシリンダ速度の変化率と、流量増減
特性から換算されるシリンダ速度変化率との差異
の程度を複数個設けられた閾値に従つて識別する
ことにより、異常の程度を判別することを特徴と
する特許請求の範囲第１項記載の射出成形装置の
シリンダ速度監視制御方法。 ３ 計測したシリンダ速度の変化率と流量増減特
性から換算されるシリンダ速度変化の変化率との
差異の程度が小さい場合には、該流量制御弁の開
度変化率を調整することにより、予め所望してい
たシリンダの速度変化が得られる様に安定化を図
ることを特徴とする特許請求の範囲第１項又は第
２項記載の射出成形装置のシリンダ速度監視制御
方法。 ４ 計測したシリンダ速度の変化率と流量増減特
性から換算されるシリンダ速度変化率との差異が
大きい場合には、該液圧回路系と液圧供給源を緊
急的に断ち、液圧回路系を保護することを特徴と
する特許請求の範囲第１項又は第２項記載の射出
成形装置のシリンダ速度監視制御方法。 ５ 計測したシリンダ速度の変化率が流量増減特
性から換算されるシリンダ速度変化の変化率に対
して120％程度になる様に設定変化率の最大値を
定めておく様にしたことを特徴とする特許請求の
範囲第１項乃至第４項記載の射出成形装置のシリ
ンダ速度監視制御方法。[Claims] 1. Adjusting the amount of liquid supplied to the cylinder or the amount of liquid discharged from the cylinder with a flow control valve, from low-speed injection to fill the sleeve with molten metal to high-speed injection speed to fill the cavity with molten metal. When changing the cylinder speed, the rate of change in cylinder speed is detected,
Comparing the detected measured rate of change with a set rate of change in the cylinder speed, which is calculated from the flow rate increase/decrease characteristics specific to the hydraulic circuit system including the flow control valve and the cylinder,
If the measured rate of change is different from the set rate of change, it is determined that there is an abnormality, and if the measured rate of change is smaller than the set rate of change, the rate of change of the flow control valve is adjusted to be larger and the next injection is performed. A cylinder speed monitoring and control method for an injection molding device, characterized by: 2. The degree of abnormality is determined by identifying the degree of difference between the measured cylinder speed change rate and the cylinder speed change rate converted from the flow rate increase/decrease characteristics according to a plurality of threshold values. A cylinder speed monitoring and control method for an injection molding apparatus according to claim 1. 3. If the difference between the measured rate of change in cylinder speed and the rate of change in cylinder speed converted from the flow rate increase/decrease characteristics is small, adjust the rate of change in the opening degree of the flow control valve to obtain the desired value in advance. 3. A cylinder speed monitoring and control method for an injection molding apparatus according to claim 1 or 2, wherein the cylinder speed monitoring and control method for an injection molding apparatus is performed to stabilize the cylinder speed so that a change in cylinder speed that has been previously observed is stabilized. 4 If the difference between the measured rate of change in cylinder speed and the rate of change in cylinder speed converted from the flow rate increase/decrease characteristics is large, immediately disconnect the hydraulic circuit system and the hydraulic pressure supply source, and disconnect the hydraulic circuit system. A cylinder speed monitoring and control method for an injection molding apparatus according to claim 1 or 2, characterized in that: 5. The maximum value of the set rate of change is determined so that the rate of change of the measured cylinder speed is approximately 120% of the rate of change of the cylinder speed converted from the flow rate increase/decrease characteristics. A cylinder speed monitoring and control method for an injection molding apparatus according to claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8053083A JPS6054262A (en) | 1983-05-09 | 1983-05-09 | Method for controlling and monitoring cylinder speed of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8053083A JPS6054262A (en) | 1983-05-09 | 1983-05-09 | Method for controlling and monitoring cylinder speed of injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6054262A JPS6054262A (en) | 1985-03-28 |
| JPH0310428B2 true JPH0310428B2 (en) | 1991-02-13 |
Family
ID=13720886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8053083A Granted JPS6054262A (en) | 1983-05-09 | 1983-05-09 | Method for controlling and monitoring cylinder speed of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6054262A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3061189B2 (en) * | 1989-12-16 | 2000-07-10 | 東芝機械株式会社 | Die casting product production monitoring method and die casting product production monitoring device |
| JP7309678B2 (en) * | 2020-10-14 | 2023-07-18 | 東洋機械金属株式会社 | die casting machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5550746A (en) * | 1978-10-07 | 1980-04-12 | Honda Motor Co Ltd | Noise reduction unit for automobile audio equipment |
-
1983
- 1983-05-09 JP JP8053083A patent/JPS6054262A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5550746A (en) * | 1978-10-07 | 1980-04-12 | Honda Motor Co Ltd | Noise reduction unit for automobile audio equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6054262A (en) | 1985-03-28 |
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