JPH01150516A - Controller for changing over speed/pressure of injection molding machine - Google Patents
Controller for changing over speed/pressure of injection molding machineInfo
- Publication number
- JPH01150516A JPH01150516A JP30873487A JP30873487A JPH01150516A JP H01150516 A JPH01150516 A JP H01150516A JP 30873487 A JP30873487 A JP 30873487A JP 30873487 A JP30873487 A JP 30873487A JP H01150516 A JPH01150516 A JP H01150516A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- injection
- control
- speed
- stroke
- 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.)
- Granted
Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 29
- 239000007924 injection Substances 0.000 claims abstract description 29
- 238000004886 process control Methods 0.000 claims abstract description 8
- 239000011347 resin Substances 0.000 claims description 14
- 229920005989 resin Polymers 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects 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
- B29C45/76—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
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
- B29C2045/776—Measuring, controlling or regulating of velocity or pressure of moulding material determining the switchover point to the holding pressure
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制御ｌｌ装置に関し、特に射出プ
ロセス制御と保圧プロセス制御とを切り換えることので
きる１ｌｌＩｊ′ｎ装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for an injection molding machine, and more particularly to a device capable of switching between injection process control and holding pressure process control.
（従来の技術）
従来、射出成形機の射出成形プロセスにおいて、射出プ
ロセスから保圧プロセスに移行する際、即ち、射出速度
制御ループから圧力制御ループへと制御系を切り換える
際には、スクリューストローク、射出時間、油圧シリン
ダーの油圧、及び全型内樹脂圧力等のいずれか一つの吊
が予め設定された値以上となると、射出速度制御ループ
から圧力制御ループへと制御系を切り換えている。(Prior Art) Conventionally, in the injection molding process of an injection molding machine, when transitioning from the injection process to the pressure holding process, that is, when switching the control system from the injection speed control loop to the pressure control loop, the screw stroke, When any one of the injection time, oil pressure of the hydraulic cylinder, and total mold resin pressure exceeds a preset value, the control system is switched from the injection speed control loop to the pressure control loop.
（発明が解決しようとする問題点）
ところが、従来、予め設定された吊以上となると、制御
系の切り換えを行っているため、射出成形はのスクリュ
ーを操作するためのサーボバルブ等への操作量が不連続
となり、その結果、保圧プロセスへ入る際に、第４図に
示すように金型内樹指圧力に急激な変動（圧ツノの落ち
込みあるいは圧力の行き過ぎ）が生じる。従って、樹脂
の逆流あるいは樹脂の過充填等が発生し、成形品が不良
となるという問題点がある。(Problem to be solved by the invention) However, in the past, when the tension exceeded a preset value, the control system was switched. becomes discontinuous, and as a result, as shown in FIG. 4, when entering the pressure holding process, a sudden fluctuation occurs in the resin pressure within the mold (a drop in the pressure horn or an excessive pressure). Therefore, there is a problem that resin backflow or resin overfilling occurs, resulting in defective molded products.
本光明の目的は制御系の切り換えがスムーズにでき、良
好な成形品を得ることのできる速度−圧力切換え装置を
提供することにある。An object of the present invention is to provide a speed-pressure switching device that allows smooth switching of the control system and that allows good molded products to be obtained.
（問題点を解決するための手段）
本光明によれば、溶融樹脂の射出速度を検出する速度検
出器と、スクリュー位置を検出する位置検出器と、ｔ１
Ｍ脂圧指圧力は油圧シリンダー圧力を検出する圧力検出
器と、検出射出ストロークが予め設定された射出ストロ
ーク以上となり、しかも射出速度制御の操作量と圧力制
御の操作量との差の絶対値が予め設定された値以下とな
ると、射出プロセス制御から保圧プロセス制御へと制御
を切り換える制御手段とを有することを特徴とする速度
−圧力切換え制御ｐ装置が得られる。(Means for Solving the Problems) According to the present invention, a speed detector for detecting the injection speed of molten resin, a position detector for detecting the screw position, and a t1
The M fat pressure finger pressure is determined by a pressure detector that detects the hydraulic cylinder pressure, the detected injection stroke is greater than or equal to a preset injection stroke, and the absolute value of the difference between the manipulated variable for injection speed control and the manipulated variable for pressure control is There is obtained a speed-pressure switching control device characterized in that it has a control means that switches control from injection process control to pressure holding process control when the pressure falls below a preset value.
（実施例） 以下本発明について実施例によって説明する。(Example) The present invention will be explained below with reference to Examples.
まず、第１図を参照して、ホッパー３１８を備える加熱
シリンダー３１ｂ内にはスクリュー３１ｃが前後進可能
に、しかも回転可能に配置されている。スクリュー３１
ｃの後端部にはピストン部材３１ｄが取り付けられてお
り、このピストン部材３１ｄは油圧シリンダー３１ｅ内
に配置されている。そして、この油圧シリンダー３１ｅ
にはサーボ弁を介して油圧ポンプ（図示せず）が連結さ
れている。また、スクリュー３１ｃの後端にはスクリュ
ー３１ｃを回転するための雷動橢３１ｂが備えられてい
る。なお、加熱シリンダー３１ｂの左側には金型（図示
せず）が備えられている。First, referring to FIG. 1, a screw 31c is disposed within a heating cylinder 31b provided with a hopper 318 so as to be movable back and forth and also rotatable. screw 31
A piston member 31d is attached to the rear end of the hydraulic cylinder 31e, and the piston member 31d is disposed within the hydraulic cylinder 31e. And this hydraulic cylinder 31e
is connected to a hydraulic pump (not shown) via a servo valve. Furthermore, a lightning bolt 31b for rotating the screw 31c is provided at the rear end of the screw 31c. Note that a mold (not shown) is provided on the left side of the heating cylinder 31b.
今、電Ｉ！ｌｌぼ３１ｂによってスクリュー３１ｃを回
転すると、ホッパー３１ａから加熱シリンダー３１ｂ内
に材料樹脂が供給され、シリンダー３１ｂ内で溶融され
る。材料樹脂の供給につれて、スクリュー３１ｃは徐々
に後進し、スクリュー３１ｃが所定の後進位置に達する
と、電動１３１ｅが停止され、計量過程が終了する。そ
の後、後述のようにサーボ弁を制御して、油圧シリンダ
ー３１ｅに油圧を送り、スクリュー３１ｃを前進させ、
金型内に溶融樹脂を射出する。Now, Den I! When the screw 31c is rotated by the cylinder 31b, the material resin is supplied from the hopper 31a into the heating cylinder 31b and is melted within the cylinder 31b. As the material resin is supplied, the screw 31c gradually moves backward, and when the screw 31c reaches a predetermined backward movement position, the electric power 131e is stopped and the metering process is completed. Then, as described later, the servo valve is controlled to send hydraulic pressure to the hydraulic cylinder 31e to advance the screw 31c,
Inject molten resin into the mold.
ここで、第２図も参照して、制ｔ１１装置について説明
する。Here, the control t11 device will be explained with reference also to FIG.
制御装置は、スクリュー位置を検出する位置検出器２４
、射出速度を検出する速度検出器２５、金型内樹脂圧力
を検出する圧力検出器２６、油圧シリンダーへの油圧量
を制御するサーボ弁２８、及び射出速度−圧力制御装＠
３０を備えている。The control device includes a position detector 24 that detects the screw position.
, a speed detector 25 that detects the injection speed, a pressure detector 26 that detects the resin pressure in the mold, a servo valve 28 that controls the amount of hydraulic pressure to the hydraulic cylinder, and an injection speed-pressure control device @
It is equipped with 30.
射出速度−圧力制ｍ＋装置３０は、中央処理装置（ｃｐ
ｕ）１８、インターフェース１９、メモリ２０、ＰＧカ
ウンタ２１ 、Ａ／Ｄ変換器２２及び２２′、及びＤ／
Ａ変換器２３を備えており、制御パラメータ入力装置２
９がインターフェース１９を介してｃｐｕｌｓに接続さ
れている。一方、上記の位置検出器２４、速度検出器２
５、及び圧力検出器２６はそれぞれＰＧカウンタ２１、
Ａ／Ｄ変換器２２、及びＡ／Ｄ変換器２２′を介してｃ
ｐｕに接続され、サーボ弁２８は、サーボアンプ２７及
びＤ／Ａ変換器２３を介してｃｐｕ１８に接続されてい
る。The injection speed-pressure control m+ device 30 has a central processing unit (cp
u) 18, interface 19, memory 20, PG counter 21, A/D converters 22 and 22', and D/D converter 22 and 22';
It is equipped with an A converter 23, and a control parameter input device 2.
9 is connected to cpuls via interface 19. On the other hand, the above-mentioned position detector 24 and speed detector 2
5, and the pressure detector 26 are respectively the PG counter 21,
c via the A/D converter 22 and the A/D converter 22'
The servo valve 28 is connected to the CPU 18 via the servo amplifier 27 and the D/A converter 23.
ここで、射出速度−圧力切換え制御について、第３図も
参照して説明する。Here, injection speed/pressure switching control will be explained with reference to FIG. 3 as well.
第３図に示すように、ｃｐｕ１８は速度制御補償部７、
圧力制御補償部８、切換系判断部９、及び制御ループ切
換部１０を備えている。As shown in FIG. 3, the CPU 18 includes a speed control compensator 7,
It includes a pressure control compensation section 8, a switching system determination section 9, and a control loop switching section 10.
まず、オペレータは、キセビティ体積、スクリュー径等
により金型キャビティに溶融樹脂が充填される際のスク
リューストロークＺｓｅｔ［月を予め算出する。さらに
、射出プロセスから保圧プロセス切換えの際の操作ｆｆ
ｌ Ｕ ［１４］が切換えの際連続とみなせるＵ ｓｅ
ｒ［１７］を予め求める。これら設定置Ｚｓｅｔ［月及
び（Ｊｓｅｔ ［１７］を制御パラメータ入力装置２９
からメモリ２０へ格納ヅる。First, the operator calculates in advance the screw stroke Zset [month] when the mold cavity is filled with the molten resin, based on the xeviity volume, screw diameter, etc. Furthermore, the operation ff when switching from the injection process to the pressure holding process
l U [14] can be considered continuous when switching U se
Find r[17] in advance. These settings Zset [month and (Jset [17]) are input to the control parameter input device 29.
It is then stored in the memory 20.
前述のように、射出動作が開始されると、スクリュー速
度検出値５（ｚ）がスクリュー速度指令値２（Ｚｒ）と
比較され、その偏差（速度偏差）が速度制御補償部７で
補償され、操作量１５（υ２）として制御ループ切換部
１０を介してサーボアンプ１１（２７）へ入力される。As mentioned above, when the injection operation is started, the detected screw speed value 5 (z) is compared with the screw speed command value 2 (Zr), and the deviation (speed deviation) is compensated by the speed control compensator 7. It is input to the servo amplifier 11 (27) via the control loop switching unit 10 as the manipulated variable 15 (υ2).
この操作量はこのサーボアンプ１１を介して射出成形ｔ
ｉ１２（即ち、サーボ弁２８）へ入力され、射出成形機
１２の射出速度が速度指令１ｉ１１ｉ２（Ｚｒ）に制御
される。また、速度制御補償部７の出力は切換条件判断
部９へ入力される。This operation amount is transferred to the injection molding t via this servo amplifier 11.
i12 (ie, the servo valve 28), and the injection speed of the injection molding machine 12 is controlled to the speed command 1i11i2 (Zr). Further, the output of the speed control compensating section 7 is input to the switching condition determining section 9.
一方、圧力検出器２５の圧力検出値６（Ｐ）がメモリ２
０に予め設定された圧力指令値３ （Ｐｒ）と比較され
、その圧力偏差が圧力制御補償部８で補償され、圧力操
作ｆｆ１１６（Ｕｐ）として切換条件判断部９へ入力さ
れる。さらに、位置検出器２４からのスクリュー位置検
出値４（ｚ）が直接切換条件判断部９へ入力される。On the other hand, the pressure detection value 6 (P) of the pressure detector 25 is
It is compared with a pressure command value 3 (Pr) set in advance to 0, and the pressure deviation is compensated by the pressure control compensator 8 and inputted to the switching condition determining unit 9 as a pressure operation ff116 (Up). Further, the screw position detection value 4(z) from the position detector 24 is directly input to the switching condition determining section 9.
切換条件判断部９では、スクリュー位置検出値４（ｚ）
と設定スクリューストロークＺｓｅｔ［１］とを比較す
るとともに、操作量１５（ｔＪＺ）と圧力操作ｆｆ１１
６（Ｕｐ）との差の絶対値、即ち、１１ Ｕｚ−Ｕｐ
ｌを求める。そして、■スクリュー位置検出値４（Ｚ）
≧設定スクリューストロークＺｓｅｔ［月、及び■ｌ
Ｉにｌ−１ＪＩ） ｌ≦ｌＪ ５ｅｔ（１７）となると
、切換条件判断部９は制御ループ切換部に切換信号を送
出し、接点へから接点Ｂに切換える。即ち、接続関係を
（Ａ−Ｃ）から（Ｂ−Ｃ）に切り換える。その結果、圧
力操作１１６（Ｕｐ）がサーボアンプ１１へ入力され、
圧力操作量１６（Ｕｐ）により射出成形機１２（即ち、
サーボ弁２８）が制御される。即ち、速度制御ループか
ら保圧（圧力）制御ループへと連続的に切り換わる。In the switching condition determination section 9, the screw position detection value 4 (z)
and the set screw stroke Zset[1], and also compare the operation amount 15 (tJZ) and the pressure operation ff11.
The absolute value of the difference from 6(Up), i.e. 11 Uz-Up
Find l. And ■ Screw position detection value 4 (Z)
≧Setting screw stroke Zset [month, and ■l
When 1≦lJ 5et (17), the switching condition determining section 9 sends a switching signal to the control loop switching section to switch from contact to contact B. That is, the connection relationship is switched from (A-C) to (B-C). As a result, the pressure operation 116 (Up) is input to the servo amplifier 11,
The injection molding machine 12 (i.e.,
A servo valve 28) is controlled. That is, the speed control loop is continuously switched to the holding pressure (pressure) control loop.
なお、上述の実施例では、全型内樹脂圧力を検出してい
るが、油圧シリンダー内圧力を用いて制御してもよい。In the above-described embodiment, the resin pressure within the entire mold is detected, but the pressure within the hydraulic cylinder may be used for control.
（発明の効宋）
以上説明したように、本発明によれば、溶融樹脂が金型
に充填された後、速度操作量と圧力操作量との連続性を
保った状態で射出速度制御ループから圧力制御ループへ
制御系を切り換えることができ、従って、常に良好な成
形品を得ることができる。(Effect of the Invention) As explained above, according to the present invention, after the molten resin is filled into the mold, the injection speed control loop is released while maintaining continuity between the speed control amount and the pressure control amount. The control system can be switched to a pressure control loop, so good molded products can always be obtained.
第１図は射出成形はの射出装置を示す図、第２図はマイ
クロコンピュータを用いた制御ｌ装置の一実施例を示す
図、１３図は本発明による速度−圧力切換え制御を説明
するだめのブロック図、第４図は従来の制御の不連続性
を説明するための図である。
７・・・速度制御補償部、８・・・圧力制御補償部、９
・・・切換条件判断部、１０・・・制御ループ切換部、
１１・・・サーボアンプ、１２・・・射出成形機、２４
・・・位置検出器、２５・・・温度検出器、２６・・・
圧力検出器、２７・・・サーボアンプ、２８・・・サー
ボ弁、２９・・・速度−圧力切換制御！＋１装置、３０
・・・制御パラメータ入力装置。Fig. 1 is a diagram showing an injection device for injection molding, Fig. 2 is a diagram showing an embodiment of a control device using a microcomputer, and Fig. 13 is a diagram for explaining speed-pressure switching control according to the present invention. The block diagram in FIG. 4 is a diagram for explaining discontinuity in conventional control. 7... Speed control compensation section, 8... Pressure control compensation section, 9
... switching condition judgment section, 10... control loop switching section,
11... Servo amplifier, 12... Injection molding machine, 24
...Position detector, 25...Temperature detector, 26...
Pressure detector, 27...Servo amplifier, 28...Servo valve, 29...Speed-pressure switching control! +1 device, 30
...Control parameter input device.
Claims (1)
行う制御装置において、溶融樹脂の射出速度を検出する
速度検出器と、スクリュー位置を検出する位置検出器と
、樹脂圧力または油圧シリンダー圧力を検出する圧力検
出器と、前記位置検出器による検出射出ストロークが予
め設定された射出ストロークとなり、しかも射出速度制
御の操作量と圧力制御の操作量との差の絶対値が予め設
定された値以下となると、前記射出プロセス制御から前
記保圧プロセス制御へ切り換える制御手段とを有するこ
とを特徴とする射出成形機の速度−圧力切換制御装置。A control device that controls the injection process and pressure holding process of an injection molding machine includes a speed detector that detects the injection speed of molten resin, a position detector that detects the screw position, and detects resin pressure or hydraulic cylinder pressure. When the injection stroke detected by the pressure detector and the position detector becomes a preset injection stroke, and the absolute value of the difference between the manipulated variable for injection speed control and the manipulated variable for pressure control becomes less than or equal to the preset value. A speed-pressure switching control device for an injection molding machine, comprising: a control means for switching from the injection process control to the pressure holding process control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30873487A JPH01150516A (en) | 1987-12-08 | 1987-12-08 | Controller for changing over speed/pressure of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30873487A JPH01150516A (en) | 1987-12-08 | 1987-12-08 | Controller for changing over speed/pressure of injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01150516A true JPH01150516A (en) | 1989-06-13 |
| JPH0482098B2 JPH0482098B2 (en) | 1992-12-25 |
Family
ID=17984642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30873487A Granted JPH01150516A (en) | 1987-12-08 | 1987-12-08 | Controller for changing over speed/pressure of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01150516A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8025692B2 (en) | 2001-10-02 | 2011-09-27 | Angiomed Gmbh & Co. Medizintechnik Kg | Stent delivery system |
| US8075606B2 (en) | 2001-07-06 | 2011-12-13 | Angiomed Gmbh & Co. Medizintechnik Kg | Delivery system having a rapid pusher assembly for self-expanding stent, and stent exchange configuration |
-
1987
- 1987-12-08 JP JP30873487A patent/JPH01150516A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8075606B2 (en) | 2001-07-06 | 2011-12-13 | Angiomed Gmbh & Co. Medizintechnik Kg | Delivery system having a rapid pusher assembly for self-expanding stent, and stent exchange configuration |
| US8025692B2 (en) | 2001-10-02 | 2011-09-27 | Angiomed Gmbh & Co. Medizintechnik Kg | Stent delivery system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0482098B2 (en) | 1992-12-25 |
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