JPH0698659B2 - Judgment method of plasticization status in injection molding machine - Google Patents
Judgment method of plasticization status in injection molding machineInfo
- Publication number
- JPH0698659B2 JPH0698659B2 JP3134469A JP13446991A JPH0698659B2 JP H0698659 B2 JPH0698659 B2 JP H0698659B2 JP 3134469 A JP3134469 A JP 3134469A JP 13446991 A JP13446991 A JP 13446991A JP H0698659 B2 JPH0698659 B2 JP H0698659B2
- Authority
- JP
- Japan
- Prior art keywords
- injection screw
- plasticization
- resin
- molding machine
- total number
- 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 - Fee Related
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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Testing And Monitoring For Control Systems (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、射出成形機の加熱筒に
おいて樹脂が適正に可塑化されたか否かを判断する可塑
化状況の判断方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of judging the plasticization status for judging whether or not a resin is properly plasticized in a heating cylinder of an injection molding machine.
【0002】[0002]
【従来の技術】加熱筒に周方向に回転自在にかつ軸方向
に移動自在に挿入された射出スクリュを、回転駆動装置
で周方向に回転させながら樹脂圧で後退させることによ
り、樹脂を可塑化して射出スクリュの前に所定量計量す
る構成とされた射出成形機においては、従来、計量時の
射出スクリュの回転数(rpm)と背圧、及び時間を測
定して樹脂の可塑化状況を知るようにしている。2. Description of the Related Art An injection screw, which is inserted into a heating cylinder so as to be rotatable in the circumferential direction and movable in the axial direction, is retracted by resin pressure while being rotated in the circumferential direction by a rotary drive device to plasticize the resin. In a conventional injection molding machine configured to measure a predetermined amount before the injection screw, the number of revolutions (rpm) and back pressure of the injection screw at the time of measurement and the time are measured to know the plasticization status of the resin. I am trying.
【0003】[0003]
【発明が解決しようとする課題】しかし、射出スクリュ
を回転させる回転駆動装置を所定の回転数に設定して
も、負荷の変動によって回転数が刻々と変わるため、表
示装置で回転数を知ってもその時の一瞬の回転数しか分
からず、回転の実体を全体的に把握することができな
い。フィードバック制御で射出スクリュの回転変動幅を
小さくすることも考えられているが、一瞬の回転数しか
分からないことは上記と同じである。However, even if the rotation driving device for rotating the injection screw is set to a predetermined rotation speed, the rotation speed changes every moment due to the fluctuation of the load, so that the display device knows the rotation speed. However, only the instantaneous number of revolutions at that time is known, and the substance of the revolution cannot be grasped as a whole. Although it has been considered to reduce the rotation fluctuation range of the injection screw by feedback control, it is the same as the above that only the instantaneous rotation speed is known.
【0004】また、計量時間も背圧の設定値や背圧の変
動によって変化する。したがって、射出スクリュの回転
数と背圧、及び計量時間を測定しただけでは、可塑化状
況を正しく把握して適正か否かを適確に判断することは
できない。Further, the measuring time also changes depending on the set value of the back pressure and the fluctuation of the back pressure. Therefore, it is not possible to accurately grasp the plasticization situation and accurately determine whether or not it is proper only by measuring the rotation speed and back pressure of the injection screw and the measuring time.
【0005】本発明は、加熱筒内の樹脂の可塑化状況を
正しく把握して適正か否かを適確に判断することができ
る射出成形機における可塑化状況の判断方法を提供する
ことを目的とする。An object of the present invention is to provide a method for judging the plasticization status in an injection molding machine, which can accurately grasp the plasticization status of the resin in the heating cylinder and judge whether or not it is appropriate. And
【0006】[0006]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明は、加熱筒に周方向に回転自在にかつ軸方
向に移動自在に挿入された射出スクリュを、回転駆動装
置で周方向に回転させながら樹脂圧で後退させることに
より、樹脂を可塑化して射出スクリュの前に所定量計量
する射出成形機において、樹脂の計量開始から終了まで
の射出スクリュの回転総数を検出し、該射出スクリュの
回転総数を基準値と比較して樹脂の可塑化状況を判断す
る構成とした。In order to achieve the above object, the present invention relates to an injection screw, which is inserted into a heating cylinder rotatably in the circumferential direction and axially movably, by a rotary drive device. In an injection molding machine that plasticizes the resin and measures a predetermined amount before the injection screw by rotating the resin backward while rotating in the direction, the total number of rotations of the injection screw from the start to the end of the measurement of the resin is detected. The total number of rotations of the injection screw is compared with a reference value to determine the plasticization status of the resin.
【0007】[0007]
【作用】計量開始から終了までの、樹脂の可塑化に実際
に働いた射出スクリュの回転総数を測定して基準値と比
較するものであるから、回転数が刻々と変化するような
ことがあっても、そのような変動に係わりなく、可塑化
状況を全体的に正確に知り、その適否を適確に判断する
ことができる。[Function] Since the total number of revolutions of the injection screw that actually worked for plasticizing the resin from the start to the end of measurement is measured and compared with the reference value, the revolution speed may change momentarily. However, regardless of such a change, it is possible to know the plasticization situation as a whole accurately and to judge its suitability appropriately.
【0008】[0008]
【実施例】図1は本発明が適用される射出成形機の主要
部を示すもので、符号1は加熱筒である。加熱筒1の図
1で右側の端部にはホッパ2が設けられ、また内部に射
出スクリュ3が挿入されている。射出スクリュ3は、オ
イルモータ等の回転駆動装置4によって周方向に回転さ
せられ、射出シリンダ5によって軸方向に動かされる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a main part of an injection molding machine to which the present invention is applied, and reference numeral 1 is a heating cylinder. A hopper 2 is provided at the right end of the heating cylinder 1 in FIG. 1, and an injection screw 3 is inserted inside. The injection screw 3 is rotated in the circumferential direction by a rotation drive device 4 such as an oil motor, and is moved in the axial direction by an injection cylinder 5.
【0009】射出スクリュ3には回転検出器6が付設さ
れている。回転検出器6は、突片7とセンサ8とから成
る。突片7は、射出スクリュ3にカップリング9で連結
された、回転駆動装置4の出力軸4aに該出力軸4aの
半径方向に突き出して取り付けられている。センサ8は
回転駆動装置4のケーシング4bに固定されており、出
力軸4a、つまり射出スクリュ3の回転に伴う突片7の
通過を検出する。この回転検出器6の他の例は後で述べ
る。A rotation detector 6 is attached to the injection screw 3. The rotation detector 6 includes a protrusion 7 and a sensor 8. The projecting piece 7 is attached to the output shaft 4a of the rotary drive device 4 connected to the injection screw 3 by the coupling 9 so as to project in the radial direction of the output shaft 4a. The sensor 8 is fixed to the casing 4b of the rotary drive device 4 and detects passage of the output shaft 4a, that is, the protruding piece 7 accompanying the rotation of the injection screw 3. Another example of the rotation detector 6 will be described later.
【0010】図3は本発明を実施する電気回路のブロッ
ク図であり、回転検出器6は、カウンタ11に接続され
ている。カウンタ11は、射出スクリュ3が1回転する
ごとに回転検出器6のセンサ8から出力される信号を受
けて射出スクリュ3の回転数を積算し、回転回数(最終
的には回転総数)として表示する。カウンタ11には設
定比較部12とコントローラ13が接続されている。設
定比較部12には、射出スクリュ3が計量開始から終了
までに回転する回転総数の上限値と下限値が基準値とし
て設定される。カウンタ11で得られた射出スクリュ3
の回転総数は設定比較部12とコントローラ13に出力
される。FIG. 3 is a block diagram of an electric circuit embodying the present invention. The rotation detector 6 is connected to a counter 11. The counter 11 receives the signal output from the sensor 8 of the rotation detector 6 every time the injection screw 3 makes one revolution, integrates the number of revolutions of the injection screw 3, and displays it as the number of revolutions (finally the total number of revolutions). To do. The setting comparison unit 12 and the controller 13 are connected to the counter 11. In the setting comparison unit 12, the upper limit value and the lower limit value of the total number of rotations of the injection screw 3 from the start of measurement to the end thereof are set as reference values. Injection screw 3 obtained by counter 11
The total number of rotations is output to the setting comparison unit 12 and the controller 13.
【0011】設定比較部12は、カウンタ11の出力信
号を受けて射出スクリュ3の回転総数を上限値及び下限
値と比較し、射出スクリュ3の回転総数が上限値と下限
値の範囲から外れた場合に警報装置14を作動させると
ともに、停止信号を射出成形機のシーケンス回路15に
出力して射出成形機の作動を停止させる。警報装置14
は、ブザーやランプ等で構成される。The setting comparator 12 receives the output signal of the counter 11 and compares the total number of revolutions of the injection screw 3 with the upper limit value and the lower limit value, and the total number of revolutions of the injection screw 3 is out of the range between the upper limit value and the lower limit value. In this case, the alarm device 14 is operated and a stop signal is output to the sequence circuit 15 of the injection molding machine to stop the operation of the injection molding machine. Alarm device 14
Is composed of a buzzer, a lamp, and the like.
【0012】設定比較部12の比較結果もコントローラ
13に出力される。コントローラ13は、カウンタ11
から入力された回転総数と設定比較部12の比較結果を
記憶部13aに記憶し、そのまま、或いは指令によって
記憶内容をプリンタ16でプリントし、またディスプレ
イ17に表示する。The comparison result of the setting comparison unit 12 is also output to the controller 13. The controller 13 uses the counter 11
The total number of revolutions input from the and the comparison result of the setting comparison unit 12 are stored in the storage unit 13a, and the stored contents are printed by the printer 16 as they are or in response to a command and displayed on the display 17.
【0013】次に、本発明に係る可塑化状況の判断方法
の一実施例を図4と図5のフローチャートにしたがって
説明する。運転を開始し、計量開始から終了するまでに
必要な射出スクリュ3の回転総数の上限値と下限値を設
定比較部12に設定する(ステップS1)。Next, one embodiment of the method for determining the plasticization status according to the present invention will be described with reference to the flow charts of FIGS. The upper limit and the lower limit of the total number of revolutions of the injection screw 3 required from the start of operation to the end of measurement are set in the setting comparison unit 12 (step S1).
【0014】成形作業に入るとステップ2において計量
(供給)中であるかどうか判断され、計量中である時
は、カウンタ11がセンサ8からの入力を読み取り(ス
テップS3)、射出スクリュ3のそれまでの回転回数を
割り出すとともに(ステップS4)、その回転回数を現
在値として表示する(ステップS5)。ステップS6で
再び計量中か否かが判断され、計量が終了するまで射出
スクリュ3の回転が計測される。When the molding operation is started, it is judged in step 2 whether or not the metering (supply) is being performed. When the metering is being carried out, the counter 11 reads the input from the sensor 8 (step S3), and the value of the injection screw 3 is changed. The number of rotations up to is calculated (step S4), and the number of rotations is displayed as a current value (step S5). In step S6, it is determined again whether or not the measurement is being performed, and the rotation of the injection screw 3 is measured until the measurement is completed.
【0015】計量が終了して射出スクリュ3が停止する
と、それまでの回転回数が回転総数としてラッチされる
(ステップS7)。上記の回転総数は、設定比較部12
に設定された上限値とステップS8で比較され、上限値
よりも小さい時はステップS9に移り、下限値と比較さ
れる。回転総数が下限値よりも大きい場合はコントロー
ラ13の記憶部13aに記憶され(ステップS12)、
ステップS13でプリンタ16に出力されるとともにデ
ィスプレイ17に表示されて終了する。When the measurement is completed and the injection screw 3 is stopped, the number of rotations up to that point is latched as the total number of rotations (step S7). The above total number of rotations is determined by the setting comparison unit 12
Is compared with the upper limit set in step S8, and when it is smaller than the upper limit, the process proceeds to step S9 and is compared with the lower limit. If the total number of rotations is larger than the lower limit value, it is stored in the storage unit 13a of the controller 13 (step S12),
In step S13, the data is output to the printer 16 and displayed on the display 17, and the process ends.
【0016】また、射出スクリュ3の回転総数がステッ
プS8において上限値以上と判断されるか、或いはステ
ップS9で下限値以下と判断された場合は、警報装置1
4が作動し(ステップS10)、機械が停止する(ステ
ップS11)。警報装置14の作動と機械の停止も記憶
部13aに記憶され、プリンタ16に出力されるととも
にディスプレイ17に表示されて(ステップS12,1
3)終了する。なお、ステップS2で計量中でないと判
断された場合はそのまま終了する。If it is determined in step S8 that the total number of rotations of the injection screw 3 is greater than or equal to the upper limit value, or in step S9 that it is less than or equal to the lower limit value, the alarm device 1 is used.
4 operates (step S10), and the machine stops (step S11). The operation of the alarm device 14 and the stoppage of the machine are also stored in the storage unit 13a, output to the printer 16 and displayed on the display 17 (steps S12, 1).
3) Finish. If it is determined in step S2 that weighing is not in progress, the process ends.
【0017】樹脂の種類や成形品によっては、射出スク
リュ3の回転総数の他に、背圧や計量時間等を加えて可
塑化状況の適否を判断することもある。Depending on the type of resin and the molded product, in addition to the total number of revolutions of the injection screw 3, back pressure, measuring time, etc. may be added to judge the suitability of the plasticization situation.
【0018】図6は回転検出器6の突片7の他の例を示
す。図6の突片7は歯車状に所定のピッチで多数形成さ
れている。このように構成した場合においては、射出ス
クリュ3の回転角まで精度よく知ることができる。セン
サ8には、通常、フォトセンサや近接スイッチ、マイク
ロスイッチ等のON,OFF信号を発するものが用いら
れる。FIG. 6 shows another example of the protrusion 7 of the rotation detector 6. A large number of protrusions 7 in FIG. 6 are formed in a gear shape at a predetermined pitch. In the case of such a configuration, the rotation angle of the injection screw 3 can be accurately known. As the sensor 8, a sensor such as a photo sensor, a proximity switch, or a micro switch that emits ON / OFF signals is usually used.
【0019】図7は他の回転検出器6の例を示す。この
回転検出器6は、エンコーダ18と、該エンコーダ18
と出力軸4aに取り付けられたプーリ19,20、及び
プーリ19,20間に巻き掛けたベルト21とから成
る。この場合は、射出スクリュ3と同期して回転するエ
ンコーダ18のパルスを積算計測して回転回数(総数)
を割り出す。なお、本発明において回転検出器6の構造
や種類は上記に限らず任意である。FIG. 7 shows another example of the rotation detector 6. The rotation detector 6 includes an encoder 18 and an encoder 18
And pulleys 19 and 20 attached to the output shaft 4a, and a belt 21 wound between the pulleys 19 and 20. In this case, the number of rotations (total number) is measured by integrating and measuring the pulses of the encoder 18 that rotates in synchronization with the injection screw 3.
Figure out. In the present invention, the structure and type of the rotation detector 6 are not limited to the above and are arbitrary.
【0020】[0020]
【発明の効果】以上説明したように、本発明の射出成形
機における可塑化状況の判断方法は、加熱筒に周方向に
回転自在にかつ軸方向に移動自在に挿入された射出スク
リュを、回転駆動装置で周方向に回転させながら樹脂圧
で後退させることにより、樹脂を可塑化して射出スクリ
ュの前に所定量計量する射出成形機において、樹脂の計
量開始から終了までの射出スクリュの回転総数を検出
し、該射出スクリュの回転総数を基準値と比較して樹脂
の可塑化状況を判断する構成とされているので、樹脂の
可塑化状況を正しく把握して可塑化が適正に行われたか
どうかを適確に判断することができる。As described above, according to the method of judging the plasticization state in the injection molding machine of the present invention, the injection screw inserted into the heating cylinder so as to be rotatable in the circumferential direction and axially movable, is rotated. In an injection molding machine that plasticizes the resin and measures a specified amount before the injection screw by rotating the drive device in the circumferential direction and retracting with the resin pressure, the total number of rotations of the injection screw from the start to the end of the measurement of the resin Since it is configured to detect and plasticize the resin by comparing the total number of rotations of the injection screw with a reference value, it is determined whether the plasticization of the resin is correctly grasped and whether the plasticization is properly performed. Can be accurately determined.
【0021】また、回転総数が各成形製品において正確
かつ直接的に計測されるため、回転総数のばらつき等か
ら成形条件の変動、つまり成形品質を総合的にチェック
することができる。Further, since the total number of rotations is accurately and directly measured in each molded product, it is possible to comprehensively check the variation of the molding conditions, that is, the molding quality, from the variation of the total number of rotations.
【図1】 本発明が適用される射出成形機の一部を破断
した主要部の正面図である。FIG. 1 is a front view of a main part with a part broken away of an injection molding machine to which the present invention is applied.
【図2】 回転検出器の一例を示す正面図である。FIG. 2 is a front view showing an example of a rotation detector.
【図3】 本発明を実施する電気回路のブロック図であ
る。FIG. 3 is a block diagram of an electrical circuit embodying the present invention.
【図4】 本発明の一実施例を示すフローチャートの前
段部である。FIG. 4 is a front part of a flowchart showing an embodiment of the present invention.
【図5】 本発明の一実施例を示すフローチャートの後
段部である。FIG. 5 is a latter part of a flowchart showing an embodiment of the present invention.
【図6】 回転検出器の突片の他の例を示す正面図であ
る。FIG. 6 is a front view showing another example of the protrusion of the rotation detector.
【図7】 回転検出器の他の例を示す正面図である。FIG. 7 is a front view showing another example of the rotation detector.
1 加熱筒 3 射出スクリュ 4 回転駆動装置 6 回転検出器 1 heating cylinder 3 injection screw 4 rotation drive device 6 rotation detector
Claims (1)
に移動自在に挿入された射出スクリュを、回転駆動装置
で周方向に回転させながら樹脂圧で後退させることによ
り、樹脂を可塑化して射出スクリュの前に所定量計量す
る射出成形機において、樹脂の計量開始から終了までの
射出スクリュの回転総数を検出し、該射出スクリュの回
転総数を基準値と比較して樹脂の可塑化状況を判断する
ことを特徴とする射出成形機における可塑化状況の判断
方法。1. A resin is plasticized by retracting an injection screw inserted into a heating cylinder so as to be rotatable in the circumferential direction and movably in the axial direction by a resin pressure while being rotated in the circumferential direction by a rotation drive device. In an injection molding machine that measures a predetermined amount before the injection screw, the total number of rotations of the injection screw from the start to the end of resin measurement is detected, and the total number of rotations of the injection screw is compared with a reference value to determine the plasticization status of the resin. A method for determining the plasticization status in an injection molding machine, which comprises:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3134469A JPH0698659B2 (en) | 1991-06-05 | 1991-06-05 | Judgment method of plasticization status in injection molding machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3134469A JPH0698659B2 (en) | 1991-06-05 | 1991-06-05 | Judgment method of plasticization status in injection molding machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0577295A JPH0577295A (en) | 1993-03-30 |
JPH0698659B2 true JPH0698659B2 (en) | 1994-12-07 |
Family
ID=15129051
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3134469A Expired - Fee Related JPH0698659B2 (en) | 1991-06-05 | 1991-06-05 | Judgment method of plasticization status in injection molding machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0698659B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW542778B (en) * | 2001-09-14 | 2003-07-21 | Sumitomo Heavy Industries | Injection apparatus |
JP4945662B2 (en) * | 2010-06-21 | 2012-06-06 | ファナック株式会社 | Injection molding machine having resin supply amount adjusting means |
-
1991
- 1991-06-05 JP JP3134469A patent/JPH0698659B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH0577295A (en) | 1993-03-30 |
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