JPH0446212B2 - - Google Patents

Info

Publication number
JPH0446212B2
JPH0446212B2 JP152485A JP152485A JPH0446212B2 JP H0446212 B2 JPH0446212 B2 JP H0446212B2 JP 152485 A JP152485 A JP 152485A JP 152485 A JP152485 A JP 152485A JP H0446212 B2 JPH0446212 B2 JP H0446212B2
Authority
JP
Japan
Prior art keywords
switching
injection
point
time
injection pressure
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
Application number
JP152485A
Other languages
Japanese (ja)
Other versions
JPS61160218A (en
Inventor
Hiromasa Ootake
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fanuc Corp
Original Assignee
Fanuc Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fanuc Corp filed Critical Fanuc Corp
Priority to JP152485A priority Critical patent/JPS61160218A/en
Publication of JPS61160218A publication Critical patent/JPS61160218A/en
Publication of JPH0446212B2 publication Critical patent/JPH0446212B2/ja
Granted legal-status Critical Current

Links

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)

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に関し、特に射出速度制御
から射出圧制御の切換及び射出圧力の切換の制御
に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an injection molding machine, and more particularly to switching from injection speed control to injection pressure control and control of injection pressure switching.

従来の技術 従来の射出成形機は射出速度や射出圧力の制御
を油圧をもつて行つており、この射出速度や射出
圧力の切換点を正確に制御することが難しかつ
た。射出機構の遅れや慣性により切換点を設定し
ても、この設定点どおりには切換られず、その制
御が難しかつた。また、射出機構をサーボモータ
で駆動し、上記射出速度や射出圧力を制御する場
合も同様であつた。Prior Art Conventional injection molding machines use hydraulic pressure to control injection speed and injection pressure, making it difficult to accurately control switching points of injection speed and injection pressure. Even if a switching point is set due to the delay or inertia of the injection mechanism, the switching is not performed according to this set point, making it difficult to control. The same applies to the case where the injection mechanism is driven by a servo motor and the injection speed and injection pressure are controlled.

第３図は、サーボモータを射出機構の駆動源と
して使用し、本発明の採用前の速度トルクとスク
リユー位置及び射出圧力制御時間の関係を示した
もので、スクリユー位置がｌ点まで速度制御（射
出速度Ｖ）を行い、ｌ点に達した以後は経過時間
がt1、t2、t3になるまでトルクをT1、T2、T3に
なるよう、サーボモータを制御して射出圧力（保
圧）の制御を行うよう設定した場合、制御系の処
理時間や出力信号の遅れ時間によつて、サーボモ
ータが切換る時点は遅れて第３図に示すように
l′、t1′、t2′、t3′点に変つてしまい、正確な射出
速
度、射出圧力（保圧）の制御が行えないという欠
点があつた。 FIG. 3 shows the relationship between speed torque, screw position, and injection pressure control time before the adoption of the present invention when a servo motor is used as the drive source of the injection mechanism. After reaching point l, the servo motor is controlled so that the torque becomes T1, T2, and T3 until the elapsed time reaches t 1 , t 2 , and t 3 to maintain the injection pressure (holding pressure). ), depending on the processing time of the control system and the delay time of the output signal, the point at which the servo motor switches will be delayed as shown in Figure 3.
l′, t 1 ′, t 2 ′, and t 3 ′ points, and there was a drawback that accurate control of injection speed and injection pressure (holding pressure) could not be performed.

発明が解決しようとする問題点 本発明は上記従来技術の問題点を解決し、サー
ボモータの動作時点の遅れを補償することによつ
て、速度制御から圧力制御（保圧制御）への切換
地点及び射出圧力（保圧）の切換点を設定値どお
りに制御できるようにしたものである。Problems to be Solved by the Invention The present invention solves the problems of the prior art described above, and compensates for the delay in the operating point of the servo motor, thereby changing the switching point from speed control to pressure control (pressure holding control). And the switching point of injection pressure (holding pressure) can be controlled according to the set value.

問題点を解決するための手段 第１図は、上記問題点を解決するために本発明
が採用した手段の要部ブロツク図で、本発明は、
射出速度制御から射出圧力制御へ切換えるスクリ
ユーの切換地点、射出圧力の切換時間及び補正用
パラメータを設定する設定手段Ａと、該設定手段
Ａで設定された切換地点、切換時間及びパラメー
タから上記設定切換地点及び設定切換時間に対応
する切換指令地点及び切換指令時間を決定する切
換点決定手段Ｂと、該切換点決定手段で決定され
た切換指令地点及び切換指令時間を記憶する記憶
手段Ｃとを設けることによつて上記問題点を解決
した。Means for Solving the Problems FIG. 1 is a block diagram of the main part of the means adopted by the present invention to solve the above problems.
Setting means A for setting the screw switching point for switching from injection speed control to injection pressure control, injection pressure switching time and correction parameters, and the above setting switching from the switching point, switching time and parameters set by the setting means A. Switching point determining means B for determining the switching command point and switching command time corresponding to the switching point and setting switching time, and storage means C for storing the switching command point and switching command time determined by the switching point determining means are provided. This has solved the above problems.

作 用 第２図は本発明の動作を説明する図であるが、
射出速度（Ｖ）制御から射出圧力（T1〜T3）制
御へ切換えるスクリユーの切換地点ｌ及び射出圧
力の切換時間t1、t2、t3を上記設定手段Ａから設
定すると共に、射出速度制御から射出圧力制御に
切換えるときの処理時間と出力信号の遅れ時間を
加えた時間をパラメータP1として、また射出圧
力の切換時における処理時間及び出力信号の遅れ
時間を加えた時間をパラメータP2として上記設
定手段Ａから設定し、上記切換点決定手段Ｂは、
該設定手段Ａから設定された切換地点ｌ、切換時
間tn（t1、t2、t3）とパラメータP1、P2及び射出
圧力制御へ切換える前の射出速度Ｖから次の第１
式、第２式で示す演算を行い、切換指令地点l″、
切換指令時間t″（t1″、t2″、t3″）を決定する。Operation FIG. 2 is a diagram explaining the operation of the present invention.
The screw switching point 1 for switching from injection speed (V) control to injection pressure (T1 to T3) control and the injection pressure switching times t 1 , t 2 , t 3 are set from the setting means A, and at the same time, from the injection speed control The above setting means sets the processing time when switching to injection pressure control plus output signal delay time as parameter P1, and the processing time when switching injection pressure and output signal delay time as parameter P2. Setting from A, the switching point determining means B,
From the switching point l set by the setting means A, the switching time tn (t 1 , t 2 , t 3 ), the parameters P1, P2, and the injection speed V before switching to injection pressure control, the following first
By performing the calculation shown in the formula and the second formula, the switching command point l″,
Determine the switching command time t″ (t 1 ″, t 2 ″, t 3 ″).

l″＝ｌ−Ｖ×P1 …(1) tn″＝tn−P2 …(2) 上記切換点決定手段Ｂで決定した上記初換指令
地点l″、切換指令時間t″（t1″、t2″、t3″）は上記
記
憶手段に記憶し、射出動作を行うときは上記記憶
手段に記憶された切換指令地点l″、切換指令時間
t″（t1″、t2″、t3″）によつて射出機構の駆動源が
制
御されるから第４図に示すように設定切換地点ｌ
及び設定切換時間t1、t2、t3で各々射出速度制御
から射出圧制御への切換、射出圧力の切換が行わ
れることとなる。 l″=l−V×P1…(1) tn″=tn−P2…(2) The initial switching command point l″ determined by the switching point determining means B, the switching command time t″ (t 1 ″, t 2 '', t3 '') are stored in the storage means, and when performing an injection operation, the switching command point l'' and switching command time stored in the storage means are stored.
Since the drive source of the injection mechanism is controlled by t'' (t 1 '', t 2 '', t 3 ''), the setting switching point l is reached as shown in Fig. 4.
At setting switching times t 1 , t 2 , and t 3 , switching from injection speed control to injection pressure control and switching of injection pressure are performed, respectively.

実施例 第４図は本発明を実施する一実施例の要部ブロ
ツク図で、１はNC制御装置で、２は射出成形機
のスクリユーを軸方向に駆動するサーボモータ、
３は位置検出器である。４は中央処理装置（以下
CPUという）で、５は射出成形機を制御するた
めの制御プログラムを制御するROM、６はデー
タの一時記憶等のために使用されるRAM、７は
速度制御から保圧制御への保圧切換点や保圧にお
ける射出圧力切換点等の設定値及び後述する上記
設定値から換算された上記各切換指令点のデータ
等を記憶するデータメモリで不揮発性のメモリで
構成されている。８は手操作入力装置で、上記各
切換点の設定データ等を入力するものである。９
は表示装置、１０は上記サーボモータを制御する
軸送り制御回路である。Embodiment FIG. 4 is a block diagram of essential parts of an embodiment of the present invention, in which 1 is an NC control device, 2 is a servo motor that drives the screw of an injection molding machine in the axial direction,
3 is a position detector. 4 is the central processing unit (hereinafter referred to as
5 is a ROM that controls the control program for controlling the injection molding machine, 6 is a RAM used for temporary storage of data, etc., and 7 is a holding pressure switch from speed control to holding pressure control. The data memory is a non-volatile memory that stores set values such as injection pressure switching points in injection pressure switching points and holding pressures, and data of each switching command point converted from the set values described later. Reference numeral 8 denotes a manual input device for inputting setting data, etc. of each of the above-mentioned switching points. 9
1 is a display device, and 10 is an axis feed control circuit that controls the servo motor.

次に、本実施例の動作を第５図の動作フローと
共に説明する。 Next, the operation of this embodiment will be explained with reference to the operation flow shown in FIG.

まず、上記手操作入力装置８から射出速度制御
から射出圧制御へ切換るスクリユーの切換地点ｌ
（第２図参照）及び射出圧の切換時間tn（t1、t2、
t3…）を設定し、さらに射出速度制御から射出圧
制御へ切換わるときの処理時間と出力信号の遅れ
時間とを加えた値P1及び射出圧切換時の処理時
間と出力信号の遅れ時間とを加えた値P2をパラ
メータとして設定し、データメモリ７へ記憶させ
る。そして、設定入力指令を入力するとCPU４
は、データメモリ７から切換地点ｌとパラメータ
P1を読出すと共にすでに設定されている射出圧
制御へ切換る前の射出速度Ｖを読出し（ステツプ
S1）、第１式で示した演算（l″＝ｌ−Ｖ×P1）を
行う（ステツプS2）。 First, from the manual input device 8, the screw switching point l is used to switch from injection speed control to injection pressure control.
(see Figure 2) and injection pressure switching time tn (t 1 , t 2 ,
t 3 ...), and then set the value P1, which is the sum of the processing time and output signal delay time when switching from injection speed control to injection pressure control, and the processing time and output signal delay time when switching injection pressure. The value P2 obtained by adding the value P2 is set as a parameter and stored in the data memory 7. Then, when a setting input command is input, CPU4
is the switching point l and parameters from data memory 7.
P1 is read out, and the injection speed V before switching to the injection pressure control that has already been set is read out (step
S1), and the calculation (l''=l-V×P1) shown in the first equation is performed (step S2).

即ち、パラメータP1の値は射出速度制御から
射出圧力制御への切換指令によりサーボモータ２
が切換わるまでの遅れ時間を意味するから、この
パラメータP1にその時の射出速度Ｖを乗算すれ
ば遅れ時間によりスクリユーが移動する距離が算
出される。その結果、切換地点ｌよりもこの算出
された距離（Ｖ×P1）だけ前の位置、即ちl″で切
換指令を出せば、上記遅れが補償され設定切換位
置で射出速度制御から射出圧力制御へと切換えら
れることを意味する。そこで、この値l″で切換指
令位置としてデータメモリ７へ記憶させる（ステ
ツプS3）。次に、指標ｎを「１」にセツトし（ス
テツプS4）、データメモリ７からパラメータP2を
読出し（ステツプS5）、指標ｎの値に対応する切
換時間tnを読出し（ステツプS6）、第２式の演算
（tn″＝tn−P2）を行う。即ち、切換指令から実際
に射出圧力が切換るまでの遅れ時間P2を補償し、
切換時間tnよりも遅れ時間P2だけ早い時間tn″で
切換指令を出せば、結果的に設定切換時間tnで実
際に射出圧が切換わることとなる。そこでこの値
tn″を切換指令時間としてデータメモリ７に記憶
させ（ステツプS8）、指標ｎに「１」加え（ステ
ツプS9）、指標ｎの値が射出圧力切換の数Ｍ（第
２図においてはＭ＝３）に達したか否か判断し
（ステツプS10）、達していなければ再びステツプ
S6以下の処理を繰り返してすべての射出圧力の
設定切換点tnに対応する射出指令時間tn″をデー
タメモリ７に記憶させ、指標ｎが射出圧力切換の
数Ｍに達すると、切換地点、切換時間の設定入力
処理は終了する。 In other words, the value of parameter P1 is changed to servo motor 2 by the switching command from injection speed control to injection pressure control.
This means the delay time until switching, so by multiplying this parameter P1 by the injection speed V at that time, the distance the screw moves will be calculated from the delay time. As a result, if the switching command is issued at a position before the switching point l by this calculated distance (V x P1), that is, l'', the above delay will be compensated and the injection speed control will switch from injection pressure control at the set switching position. Therefore, this value l'' is stored in the data memory 7 as the switching command position (step S3). Next, the index n is set to "1" (step S4), the parameter P2 is read from the data memory 7 (step S5), the switching time tn corresponding to the value of the index n is read (step S6), and the second equation The calculation (tn''=tn-P2) is performed.In other words, the delay time P2 from the switching command to the actual switching of the injection pressure is compensated,
If the switching command is issued at a time tn'' which is earlier than the switching time tn by the delay time P2, the injection pressure will actually be switched at the set switching time tn.Therefore, this value
tn'' is stored in the data memory 7 as the switching command time (step S8), and "1" is added to the index n (step S9), so that the value of the index n becomes the number M of injection pressure switching (M=3 in Fig. 2). ) is reached (step S10), and if it has not been reached, the step is repeated.
Repeat the process from S6 onwards to store the injection command time tn'' corresponding to all the injection pressure setting switching points tn in the data memory 7, and when the index n reaches the number M of injection pressure switching, the switching point and switching time The setting input process ends.

そして、射出成形機が射出動作を行うときは、
このデータメモリ７に記憶された切換指令地点
l″、切換指令時間tn″に従つて射出速度制御から
射出圧制御への切換及び射出圧の切換指令が出さ
れるから、第２図に示すように切換設定値に合致
した地点及び時間に射出速度制御から射出圧制御
への切換、射出圧の切換が行われることとなる。 When the injection molding machine performs the injection operation,
Switching command point stored in this data memory 7
l'', switching command time tn'', switching from injection speed control to injection pressure control and injection pressure switching command are issued, so injection is performed at the point and time that match the switching setting value as shown in Figure 2. Switching from speed control to injection pressure control and switching of injection pressure will be performed.

発明の効果 本発明は切換のための処理時間と出力信号の遅
れ時間を補償して射出速度制御から射出圧制御へ
の切換及び射出圧の切換の指令を出せるようにし
たから遅れがなく設定値どおり正確に切換るから
品質のよい成形品を製造することができる。Effects of the Invention The present invention compensates for the processing time for switching and the delay time of the output signal so that commands for switching from injection speed control to injection pressure control and injection pressure switching can be issued, so there is no delay and the set value Since the switching is performed accurately, high-quality molded products can be manufactured.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明による従来技術の問題点を解決
するための手段の要部ブロツク図、第２図は本発
明による射出成形機の動作を説明する図、第３図
は従来の射出成形機の動作を説明する図、第４図
は本発明の一実施例の要部ブロツク図、第５図は
同実施例の動作フローである。 １……NC制御装置。 Fig. 1 is a block diagram of a main part of a means for solving the problems of the prior art according to the present invention, Fig. 2 is a diagram explaining the operation of an injection molding machine according to the present invention, and Fig. 3 is a diagram of a conventional injection molding machine. FIG. 4 is a block diagram of a main part of an embodiment of the present invention, and FIG. 5 is a flowchart of the operation of the embodiment. 1...NC control device.

Claims (1)

【特許請求の範囲】[Claims] １ 射出成形機において、射出速度制御から射出
圧力制御へ切換えるスクリユーの切換地点、射出
圧力の切換時間及び補正用パラメータを設定する
設定手段と、該設定手段で設定された切換地点、
切換時間及びパラメータから上記設定切換地点及
び設定切換時間に対応する切換指令地点及び切換
指令時間を決定する切換点決定手段と、該切換点
決定手段で決定された切換指令地点及び切換指令
時間を記憶する記憶手段とを有し、該記憶手段に
記憶された切換指令地点及び切換指令時間に基づ
いて射出機構の駆動源を切換え制御することを特
徴とする射出成形機。1. In an injection molding machine, a setting means for setting a screw switching point for switching from injection speed control to injection pressure control, an injection pressure switching time and correction parameters, and a switching point set by the setting means;
Switching point determining means for determining a switching command point and switching command time corresponding to the set switching point and set switching time from the switching time and parameters, and storing the switching command point and switching command time determined by the switching point determining means. 1. An injection molding machine, comprising: a storage means for controlling a drive source of an injection mechanism based on a switching command point and a switching command time stored in the storage means.
JP152485A 1985-01-10 1985-01-10 Injection molding machine Granted JPS61160218A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP152485A JPS61160218A (en) 1985-01-10 1985-01-10 Injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP152485A JPS61160218A (en) 1985-01-10 1985-01-10 Injection molding machine

Publications (2)

Publication Number Publication Date
JPS61160218A JPS61160218A (en) 1986-07-19
JPH0446212B2 true JPH0446212B2 (en) 1992-07-29

Family

ID=11503895

Family Applications (1)

Application Number Title Priority Date Filing Date
JP152485A Granted JPS61160218A (en) 1985-01-10 1985-01-10 Injection molding machine

Country Status (1)

Country Link
JP (1) JPS61160218A (en)

Also Published As

Publication number Publication date
JPS61160218A (en) 1986-07-19

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