JPH0455849B2 - - Google Patents
Info
- Publication number
- JPH0455849B2 JPH0455849B2 JP32950087A JP32950087A JPH0455849B2 JP H0455849 B2 JPH0455849 B2 JP H0455849B2 JP 32950087 A JP32950087 A JP 32950087A JP 32950087 A JP32950087 A JP 32950087A JP H0455849 B2 JPH0455849 B2 JP H0455849B2
- Authority
- JP
- Japan
- Prior art keywords
- material supply
- time
- molding material
- amount
- section
- 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
Links
- 239000000463 material Substances 0.000 claims description 89
- 239000012778 molding material Substances 0.000 claims description 76
- 238000002347 injection Methods 0.000 claims description 58
- 239000007924 injection Substances 0.000 claims description 58
- 238000005259 measurement Methods 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 18
- 238000005303 weighing Methods 0.000 claims description 13
- 238000004898 kneading Methods 0.000 claims description 12
- 230000007423 decrease Effects 0.000 description 9
- 235000003642 hunger Nutrition 0.000 description 8
- 230000037351 starvation Effects 0.000 description 8
- 238000000465 moulding Methods 0.000 description 7
- 239000003365 glass fiber Substances 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 208000015943 Coeliac disease Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Landscapes
- 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〕
この発明は、射出機の射出シリンダに、成形材
料を計量して供給するための材料供給装置を備え
た射出機の材料供給量制御方法及びその装置に関
するものである。Detailed Description of the Invention [Industrial Application Field] The present invention relates to a material supply amount control method for an injection machine equipped with a material supply device for metering and supplying molding material to an injection cylinder of the injection machine; This is related to the device.
従来の通常の射出機に於ける材料供給は、材料
供給部に取付けたホツパに、成形材料を入れて行
われ、その場合の成形材料の計量は、主として射
出スクリユの回転数及び回転時間に依存する。こ
の場合の射出シリンダには、成形材料が充満状態
にある。また、その混練状態は、主として射出ス
クリユの形状、特に圧縮比に依存し、混練状態を
変化させるためには、圧縮比の異なる射出スクリ
ユとの交換を要する。加えて、高粘度の成形材料
を使用する際には、可塑化トルクが定格を超過す
ることがあつた。このような理由から、射出機の
材料供給部に、スクリユフイーダ等の材料供給装
置を備え、成形材料の供給量を制御することによ
り、混練状態の変化或いは可塑化トルクの定格超
え等に対処し、成形品の品質を確保するようにな
つている。
Material feeding in a conventional normal injection machine is carried out by putting the molding material into a hopper attached to the material supply section, and in this case, the measurement of the molding material mainly depends on the rotation speed and rotation time of the injection screw. do. The injection cylinder in this case is filled with molding material. Further, the kneading state mainly depends on the shape of the injection screw, especially the compression ratio, and in order to change the kneading state, it is necessary to replace the injection screw with an injection screw having a different compression ratio. In addition, when using a high viscosity molding material, the plasticizing torque sometimes exceeded the rating. For this reason, by equipping the material supply section of the injection machine with a material supply device such as a screw feeder to control the supply amount of molding material, it is possible to deal with changes in the kneading state or exceeding the plasticizing torque rating. The quality of molded products is now being ensured.
この材料供給装置による成形材料の供給量は、
成形される製品及びスプルー、ランナ、ゲート等
のある金型内の材料分だけ、即ち1シヨツト分の
成形材料を出来るだけ厳密に供給することが望ま
しい。このために、材料供給装置として例えばス
クリユフイーダを備える場合、その供給時間或い
はスクリユの回転数を設定して対処している。 The amount of molding material supplied by this material supply device is
It is desirable to supply molding material as precisely as possible for the product to be molded and the material in the mold containing sprues, runners, gates, etc., that is, for one shot. For this purpose, when a screw feeder is provided as the material supply device, for example, the supply time or the number of revolutions of the screw is set.
しかしながら、かかる従来の射出機の材料供給
装置にあつては、各シヨツト毎の供給量を完全に
一致させることは略不可能であり、その結果、成
形材料の供給量は、各シヨツト毎に相違し、漸増
又は漸減傾向を示す。成形材料が漸増すると、射
出シリンダの成形材料が次第に増大し、最終的に
は成形材料が充満状態となり、前述したホツパに
成形材料を入れる射出機の場合と同様となり、材
料供給装置の存在が無意味となる。また、成形材
料が漸減すると、射出シリンダの成形材料が次第
に減少し、最終的には計量部に於いて計量するた
めの成形材料が確保できなくなり、計量不能の事
態を生じる。
However, in the material supply device of such a conventional injection machine, it is almost impossible to completely match the supply amount for each shot, and as a result, the supply amount of molding material differs for each shot. It shows a tendency to gradually increase or decrease. As the amount of molding material increases gradually, the amount of molding material in the injection cylinder gradually increases until it is finally filled with molding material, which is similar to the case of the injection machine in which the molding material is put into the hopper described above, and there is no need for a material supply device. It becomes meaning. Furthermore, as the molding material gradually decreases, the molding material in the injection cylinder gradually decreases, and eventually the measuring section cannot secure enough molding material to be measured, resulting in a situation in which measurement becomes impossible.
この発明は、かかる従来の問題点に鑑みてなさ
れたものであり、特許請求の範囲第1項に記載し
た発明の構成は、材料供給装置を備えた射出機に
て、材料供給部へ成形材料を供給するに際し、可
塑化工程時の実際の計量時間を計量時間検出器に
て検出し、該計量時間と予め設定した基準計量時
間との差を判定手段にて判定し、その判定結果に
基づいて材料供給装置による材料供給量を制御す
る射出機の材料供給制御方法である。
This invention has been made in view of such conventional problems, and the configuration of the invention described in claim 1 is such that an injection machine equipped with a material supply device supplies molding material to a material supply section. When supplying, a measuring time detector detects the actual measuring time during the plasticizing process, a determining means determines the difference between the measuring time and a preset reference measuring time, and based on the determination result. This is a material supply control method for an injection machine that controls the amount of material supplied by a material supply device.
しかして、材料供給装置から射出機の材料供給
部に供給された成形材料は、混練部にて溶融及び
混練され、計量部へ移送される。その際、計量時
間検出器によつて計量部での成形材料の実際の計
量時間が検出される。この計量時感が適正である
かどうかが、実際の計量時間と予め設定した基準
計量時間との差として判定手段にて判定される。 The molding material supplied from the material supply device to the material supply section of the injection machine is melted and kneaded in the kneading section, and then transferred to the measuring section. In this case, a metering time detector detects the actual metering time of the molding material in the metering section. Whether or not this feeling during measurement is appropriate is determined by the determination means as the difference between the actual measurement time and a preset reference measurement time.
そして、実際の計量時間が適正時間よりも長い
場合には、より多くの成形材料を射出機の材料供
給部に供給する。これに対し、実際の計量時間が
適正時間よりも短い場合には、より少ない成形材
料を射出機の材料供給部に供給する。このよう
に、計量時間を把持して、材料供給装置から供給
される成形材料が適正量に維持される。 If the actual metering time is longer than the appropriate time, more molding material is supplied to the material supply section of the injection machine. On the other hand, if the actual metering time is shorter than the appropriate time, less molding material is supplied to the material supply section of the injection machine. In this way, the amount of molding material supplied from the material supply device is maintained at an appropriate amount by keeping track of the metering time.
また、特許請求の範囲第2項に記載した発明の
構成は、材料供給装置としてのスクリユフイーダ
から材料供給部へ供給された成形材料が、射出ス
クリユにより、混練部にて可塑化され、計量部に
移送後に、ノズルから射出される射出後に於い
て、該計量部での成形材料の実際の計量時間を検
出する計量時間検出器と、成形材料に応じた材料
供給量基本制御値を設定する基本制御値設定手段
と、前記検出された計量時間と予め設定した基準
計量時間との差を判定する判定手段と、該判定手
段の判定結果に修正係数を乗じた絶対値が補正量
とし、基準計量時間よりも計量時間のほうが長い
とき、材料供給量基本制御値に適正量を加算し、
基準計量時間よりも計量時間のほうが短いとき、
材料供給量制御値から補正量を減算して、制御信
号を得る補正手段とを備え、該制御信号に基づい
て前記スクリユフイーダを駆動する射出機の材料
供給制御装置である。 In addition, the configuration of the invention described in claim 2 is such that the molding material supplied from the screw feeder as a material supply device to the material supply section is plasticized in the kneading section by the injection screw, and is transferred to the measuring section. A metering time detector that detects the actual metering time of the molding material in the metering section after injection from the nozzle after transfer, and a basic control that sets the material supply amount basic control value according to the molding material. a value setting means, a determination means for determining the difference between the detected measurement time and a preset reference measurement time, and an absolute value obtained by multiplying the determination result of the determination means by a correction coefficient as a correction amount; When the measuring time is longer than , add the appropriate amount to the material supply amount basic control value,
When the weighing time is shorter than the standard weighing time,
The present invention is a material supply control device for an injection machine, comprising a correction means for obtaining a control signal by subtracting a correction amount from a material supply amount control value, and driving the screw feeder based on the control signal.
しかして、スクリユフイーダから噴出機の材料
供給部に供給された成形材料は、混練部にて溶融
及び混練され、計量部に移送される。その際、計
量時間検出器によつて計量部での成形材料の実際
の計量時間が検出され、この実際の計量時間が適
正であるかどうかが、予め設定した基準計量時間
との差として判定手段にて判定される。この判定
結果である時間差に修正係数を乗じたものの絶対
値として補正量を求め、基準計量時間よりも実際
の計量時間のほうが長いときには、スクリユフイ
ーダから供給される成形材料が不足ぎみであるた
め、基本制御値設定手段にて設定された材料供給
量基本制御値に補正量を加算し、その補正信号に
よつてスクリユフイーダを幾分長目に駆動し、よ
り多くの成形材料を噴出機の材料供給部に供給す
る。これに対し、基準計量時間よりも実際の計量
時間のほうが短いときには、材料供給装置から供
給される成形材料が過剰ぎみであるため、基本制
御値設定手段にて設定された材料供給量基本制御
値から適正量を減算し、その補正信号によつてス
クリユフイーダを幾分短目に駆動し、より少ない
成形材料を射出機の材料供給部に供給する。基準
計量時間と実際の計量時間とが一致するときは、
実際の計量時間が適正時間であり、スクリユフイ
ーダから供給される成形材料が適正量であるた
め、基本制御値設定手段にて設定された材料供給
量基本制御値に零の補正量を加算し、その補正信
号によつて材料供給装置を駆動する。なお、材料
供給装置の駆動が、可塑化工程完了時から次の可
塑化工程直前までの間に行われれば、射出機の各
工程が円滑に実行される。 The molding material supplied from the screw feeder to the material supply section of the jetting machine is melted and kneaded in the kneading section, and then transferred to the measuring section. At this time, the actual measuring time of the molding material in the measuring section is detected by the measuring time detector, and the judgment means determines whether this actual measuring time is appropriate or not as the difference from the preset standard measuring time. Judgment will be made. The correction amount is calculated as the absolute value of the time difference, which is the result of this judgment, multiplied by the correction coefficient. A correction amount is added to the material supply amount basic control value set by the control value setting means, and the screw feeder is driven for a somewhat longer time based on the correction signal, so that more molding material is delivered to the material supply section of the injection machine. supply to. On the other hand, when the actual metering time is shorter than the standard metering time, the molding material supplied from the material supply device is almost excessive, so the material supply amount basic control value set by the basic control value setting means is The correction signal is used to drive the screw feeder somewhat shorter, thereby supplying less molding material to the material supply section of the injection machine. When the standard weighing time and the actual weighing time match,
Since the actual measurement time is the appropriate time and the molding material supplied from the screw feeder is the appropriate amount, a correction amount of zero is added to the material supply amount basic control value set by the basic control value setting means, and the The material supply device is driven by the correction signal. Note that if the material supply device is driven from the time of completion of the plasticizing process to just before the next plasticizing process, each process of the injection machine will be executed smoothly.
以下、この発明の実施例について図面を参照し
て説明する。
Embodiments of the present invention will be described below with reference to the drawings.
第1〜3図は、この発明の1実施例を示す。符
号1は射出機を示し、材料供給部21にはスクリ
ユフイーダからなる材料供給装置2が備えられて
いる。ホツパ31から供給された成形材料は、材
料供給装置2の駆動装置32にて駆動される供給
スクリユ33にて計量されて、射出機の材料供給
部21に供給される。射出機の材料供給部21に
供給された成形材料は、射出シリンダ34と射出
スクリユ35との間の混練部22にて溶融及び混
練され、この可塑化工程中に、計量部23に移送
される。この計量部23には、ノズル24から金
型25に射出される成形材料が計量貯溜される。
計量部23での成形材料の計量に要する時間であ
る計量時間を検出する計量時間検出器3が、例え
ば射出スクリユ35の駆動側に設けられる。しか
して、計量時間検出器3は、計量開始から計量完
了までに要する時間、具体的には、成形材料をノ
ズル24から金型25に射出した後、射出スクリ
ユ35が回転を始めた可塑化工程にて、計量部2
3に成形材料が順次に計量貯溜され、射出スクリ
ユ35が次第に後退し、計量完了のリミツトスイ
ツチ等が作動するまでの時間を検出する検出器で
ある。 Figures 1-3 show one embodiment of the invention. Reference numeral 1 indicates an injection machine, and a material supply section 21 is equipped with a material supply device 2 consisting of a screw feeder. The molding material supplied from the hopper 31 is measured by a supply screw 33 driven by a drive device 32 of the material supply device 2, and is supplied to the material supply section 21 of the injection machine. The molding material supplied to the material supply section 21 of the injection machine is melted and kneaded in the kneading section 22 between the injection cylinder 34 and the injection screw 35, and is transferred to the measuring section 23 during this plasticizing process. . In the measuring section 23, the molding material to be injected from the nozzle 24 into the mold 25 is measured and stored.
A metering time detector 3 for detecting a metering time, which is the time required for metering the molding material in the metering section 23, is provided, for example, on the drive side of the injection screw 35. Therefore, the metering time detector 3 measures the time required from the start of metering to the end of metering, specifically, the plasticizing process in which the injection screw 35 starts rotating after the molding material is injected from the nozzle 24 into the mold 25. At the weighing section 2
This detector detects the time from when the molding material is sequentially measured and stored at 3, the injection screw 35 is gradually retreated, and when a limit switch or the like is activated to complete the measurement.
射出機1の材料供給部21に材料供給装置2を
取付けた場合、射出シリンダ34内の成形材料
は、充満状態にはなく、いわゆる飢餓フイードの
状態にある。この飢餓フイード状態にあつては、
材料供給部21へホツパ31から直接に材料供給
部21に成形材料を供給し、成形材料が射出シリ
ンダ34内に充満状態となつている場合と比較し
て、計量部23での成形材料の計量時間は飢餓フ
イードの状態に応じて異なる。しかして、この飢
餓フイード状態を一定に維持し、成形品の品質を
一定に保つためには、材料供給装置2による成形
材料の供給量を出来るだけ一定にすることが必要
である。ここに本発明者等は、1シヨツトに対応
する一定時間内に、材料供給装置2から材料供給
部21に供給される成形材料が、ノズル24から
射出される1シヨツト分と相違する際に、理想的
な飢餓フイード状態にある時の計量時間を基準と
して、種々の計量時間を検討し、その結果次のこ
とが判明した。すなわち、計量時間が長くなるの
は、シリンダ34内の成形材料が量的に減少した
ためであり、一定時間内に、材料供給装置2から
材料供給部21に供給される成形材料が、常に1
シヨツト分より少ない状態となつており、射出ス
クリユ35の可塑化能力を結果的に低下させた。
一方、計量時間が短くなるのは、シリンダ34内
に貯溜される成形材料の単位時間当たりの量が増
加したためであり、一定時間内に、材料供給装置
2から材料供給部21に供給される成形材料が、
常に1シヨツト分よりも多い状態となつたために
おきる、射出シリンダ34内の成形材料の増大が
原因であつた。 When the material supply device 2 is attached to the material supply section 21 of the injection machine 1, the molding material in the injection cylinder 34 is not in a full state but in a so-called starvation feed state. In this starvation feed state,
Compared to the case where the molding material is directly supplied to the material supply section 21 from the hopper 31 and the injection cylinder 34 is filled with the molding material, the measurement of the molding material in the metering section 23 is faster. The time varies depending on the starvation feed condition. Therefore, in order to maintain this starvation feed state constant and to maintain constant quality of the molded product, it is necessary to keep the amount of molding material supplied by the material supply device 2 as constant as possible. Here, the present inventors explained that when the molding material supplied from the material supply device 2 to the material supply unit 21 is different from the amount of molding material injected from the nozzle 24 for one shot within a certain period of time corresponding to one shot, Various measurement times were investigated based on the measurement time under ideal starvation feed conditions, and the following findings were made as a result. In other words, the measuring time becomes longer because the molding material in the cylinder 34 decreases in quantity, and the molding material supplied from the material supply device 2 to the material supply section 21 within a certain period of time is always 1.
This resulted in a decrease in the plasticizing ability of the injection screw 35.
On the other hand, the reason why the measuring time becomes shorter is because the amount of molding material stored in the cylinder 34 per unit time increases. The material is
The cause was an increase in the amount of molding material in the injection cylinder 34, which was caused by the fact that there was always more than one shot.
これらの事柄から、1シヨツトに適正に対応す
る成形材料を材料供給装置2から材料供給部21
に供給するためには、一定の飢餓フイードの状態
として、計量時間が一定時間となるように管理す
ればよいことが判明した。 Based on these matters, the molding material suitable for one shot is transferred from the material supply device 2 to the material supply unit 21.
It has been found that in order to supply a constant starvation feed, the measurement time can be controlled to be a constant time.
このために、射出スクリユ35の駆動側に設け
た計量所要時間検出器3によつて、計量部23で
の成形材料の実際の計量時間T1を検出し、この
計量時間T1と予め設定した基準計量時間T0とを、
判定手段4によつて比較し、計量時間T1と基準
計量時間T0との差(T1−T0)を求め、計量時間
T1が適正であるかどうかを判定する。その時間
差の判定結果に基づき、補正手段5から制御信号
tを出力する。制御信号tは、基本制御値設定手
段6によつて成形材料に応じて予め設定された材
料供給量基本制御値t0に補正量を演算したもので
ある。制御信号tは、駆動装置32に入力され、
この制御信号tに応じて材料供給装置2が駆動さ
れ、射出機の材料供給部21には適正量の成形材
料が供給されることになる。 For this purpose, the actual measuring time T1 of the molding material in the measuring section 23 is detected by the measuring time detector 3 provided on the driving side of the injection screw 35, and the measuring time T1 is set in advance. The reference weighing time T 0 and
The comparison is made using the determination means 4, and the difference (T 1 − T 0 ) between the measurement time T 1 and the reference measurement time T 0 is obtained, and the measurement time is
Determine whether T 1 is appropriate. Based on the determination result of the time difference, the control signal t is output from the correction means 5. The control signal t is obtained by calculating a correction amount to the material supply amount basic control value t 0 preset according to the molding material by the basic control value setting means 6. The control signal t is input to the drive device 32,
The material supply device 2 is driven in accordance with this control signal t, and an appropriate amount of molding material is supplied to the material supply section 21 of the injection machine.
この判定手段4、補正手段5及び基本制御値設
定手段6は、第2図に示すようにマイクロコンピ
ユータ7にて構成される。第3図にはそのフロー
チヤートを示す。先ず、ステツプ40において実際
の計量時間T1を計量所要時間検出器3によつて
検出し、メモリに予め記憶させておいた基準計量
時間T0を読み出す(ステツプ41)。この基準計量
時間T0は、成形材料の種類に応じて複数個記憶
させておき、手動による操作信号に応じて該当す
る基準計量時間T0を読み出すようにすることも
できる。次に、ステツプ42において、検出した
計量時間T1を判定する。すなわち、判定手段4
において計量時間T1と基準計量時間T0とを比較
し、両者が等しい時間である場合、基本制御値設
定手段6によつて予め設定された材料供給量基本
制御値t0をそのまま、すなわち補正手段5におい
て零の補正量を加算した制御信号tとする(ステ
ツプ43)。実際の計量時間T1が基準計量時間T0よ
りも長い場合には、材料供給量基本制御値t0に補
正値K×(T1−T0)の絶対値を計算し(ステツプ
44)、計量時間T1が基準計量時間T0よりも短い場
合には、材料供給量基本制御値t0から補正値K×
(T1−T0)の絶対値を減算し(ステツプ45)それ
ぞれ制御信号tを得る。ここに、Kは修正係数で
ある。これらの制御信号tは、出力レジスタに移
され(ステツプ46)、駆動装置32に入力される。
かくして、この制御信号tに応じて材料供給装置
2が駆動され、射出成形機の材料供給部21には
所定量の成形材料が供給される。この材料供給部
21に成形材料を供給する時期は、或る可塑化工
程完了時から次の可塑化工程直前までの間とする
ここで、予め設定される基準計量期間T0は、
次のように決定される。第2図において、金型2
5内の成形材料の重量をMgとする。この時、計
量を完了した計量部23内の計量値を(M+α)
gにする。αは、射出後の計量部23での残量を
考慮したものである。また射出シリンダ34と射
出スクリユ35との間の成形材料の重量を(M+
β)gとする。βは、成形材料の溶融粘度、混練
のさせかたによつて異なるが、Mに近い値とす
る。更に、正確に重量測定した成形材料Mgを、
或る可塑化工程完了時から次の可塑化工程直前ま
での間に材料供給部21に供給する。この状態
で、次の可塑化工程に移り、計量部23での計量
がなされる。この時の計量時間を基準計量時間
T0とする。 The determining means 4, the correcting means 5, and the basic control value setting means 6 are constituted by a microcomputer 7, as shown in FIG. FIG. 3 shows the flowchart. First, in step 40, the actual measurement time T1 is detected by the measurement required time detector 3, and the reference measurement time T0 stored in advance in the memory is read out (step 41). A plurality of reference measurement times T 0 may be stored depending on the type of molding material, and the corresponding reference measurement time T 0 may be read out in response to a manual operation signal. Next, in step 42, the detected metering time T1 is determined. That is, the determining means 4
, the measuring time T 1 and the standard measuring time T 0 are compared, and if they are equal, the material supply amount basic control value t 0 set in advance by the basic control value setting means 6 is unchanged, that is, corrected. In the means 5, the control signal t is obtained by adding the zero correction amount (step 43). If the actual weighing time T 1 is longer than the standard weighing time T 0 , the absolute value of the correction value K x (T 1 - T 0 ) is calculated for the material supply amount basic control value t 0 (step 1).
44), if the measuring time T 1 is shorter than the standard measuring time T 0 , the correction value K×
The absolute value of (T 1 -T 0 ) is subtracted (step 45) to obtain the respective control signal t. Here, K is a correction coefficient. These control signals t are transferred to an output register (step 46) and input to the driver 32.
Thus, the material supply device 2 is driven in accordance with this control signal t, and a predetermined amount of molding material is supplied to the material supply section 21 of the injection molding machine. The timing for supplying the molding material to the material supply section 21 is from the completion of a certain plasticizing process to just before the next plasticizing process. Here, the preset reference measurement period T 0 is as follows:
It is determined as follows. In Figure 2, mold 2
The weight of the molding material in 5 is Mg. At this time, the measured value in the measuring section 23 that has completed measurement is (M+α)
Make it g. α takes into consideration the amount remaining in the measuring section 23 after injection. Also, the weight of the molding material between the injection cylinder 34 and the injection screw 35 is (M+
β) Let it be g. β varies depending on the melt viscosity of the molding material and the kneading method, but is set to a value close to M. Furthermore, the molding material Mg whose weight was accurately measured,
The material is supplied to the material supply unit 21 between the time of completion of a certain plasticizing process and just before the next plasticizing process. In this state, the next plasticizing step is carried out, and measurement is performed in the measuring section 23. The measurement time at this time is the reference measurement time.
Let it be T 0 .
予め設定した材料供給量制御値t0は、材料供給
装置2が例えばスクリユフイーダの場合には、ス
クリユ回転数を所定の回転数に固定し、その状態
でMgの成形材料を供給できるスクリユ回転時間
として与えられる。また、修正係数Kは、成形材
料の種類、形状、大きさ、混入物の種類等によつ
て異なるが、主として材料供給量基本制御値T0
と基準計量時間T0との比(t0/T0)を基準とし
て決定する。具体的には、0.1〜5の範囲で可変
設定できるのが好ましいが、0.1〜1の狭い範囲
で可変設定できるものでもよい。 If the material supply device 2 is a screw feeder, for example, the preset material supply amount control value t 0 is the screw rotation time that can fix the screw rotation speed at a predetermined rotation speed and supply Mg molding material in that state. Given. In addition, the correction coefficient K varies depending on the type, shape, size, and type of contaminants of the molding material, but mainly depends on the material supply amount basic control value T 0
and the reference measurement time T 0 (t 0 /T 0 ). Specifically, it is preferable that the value can be set variably within a range of 0.1 to 5, but it may also be variably set within a narrow range of 0.1 to 1.
次にポリプロピレン(pp)の成形を例として
具体的に説明する。 Next, molding of polypropylene (pp) will be specifically explained as an example.
射出機1は、150tの型締力、600Kg/cm2の射出
圧力、230°のシリンダ温度として、1シヨツトに
て72gの成形品を成形した。 Injection machine 1 molded a molded product of 72 g in one shot under a mold clamping force of 150 t, an injection pressure of 600 Kg/cm 2 , and a cylinder temperature of 230°.
この発明によらない場合、即ち、例えばスクリ
ユフイーダを使用し、その駆動時間を固定した場
合には、計量部23での実際の計量時間T1は一
定とならず、漸増又は漸減傾向を示し、漸増傾向
にあつては材料不足を招き、最終的には計量不能
となり、漸減傾向にあつては材料過多を招き、ホ
ツパを射出機の材料供給部21に直接取付けた場
合と同様に、射出シリンダ34が成形材料充満状
態となり、通常成形での計量時間にまで短くなつ
た。この計量時間が短くなつた状態での、スクリ
ユフイーダによる1シヨツトの供給時間は10秒で
あり、計量時間は、成形開始時点に15秒であつた
ものが最終的に12秒に短縮された。その結果、成
形品にソリ、ヒケ等を生じて外観が不均一とな
り、更には、引張、曲げ、衝撃等の成形品物性値
も不均一となつた。 In a case other than the present invention, that is, for example, when a screw feeder is used and its driving time is fixed, the actual measuring time T1 in the measuring section 23 is not constant, but shows a tendency to gradually increase or gradually decrease. If the hopper is attached directly to the material supply section 21 of the injection machine, it will cause a shortage of material and eventually become impossible to measure, and if it tends to gradually decrease, it will cause an excess of material. was filled with molding material, and the measuring time was shortened to the time required for normal molding. With this shortened metering time, the feed time for one shot by the screw feeder was 10 seconds, and the metering time was finally shortened from 15 seconds at the start of molding to 12 seconds. As a result, warpage, sink marks, etc. occurred in the molded product, resulting in non-uniform appearance, and furthermore, physical properties of the molded product, such as tensile strength, bending, impact, etc., also became non-uniform.
そこで、この発明を適用し、基準計量時間T0
を15秒、材料供給基本制御値t0を10秒、修正係数
Kを0.5に設定して、成形を行つた。その結果、
実際の計量時間T1は、14.6〜15.4秒の間で変動し
たのみであり、得あれた成形品の外観及び成形品
の強度等は良好であり、品質は、一定の良好な範
囲内におさまつた。特に、ガラス繊維等を混入し
たポリプロピレンの場合、ガラス繊維等の破損が
少なく、例えば平均ガラス繊維長0.7mmのものを
30重量%混入したポリプロピレンの場合、前記し
た従来のホツパから成形材料を供給すると平均ガ
ラス繊維長が0.4〜0.45mmにまで低下するのに対
し、この発明によれば、平均ガラス繊維長が0.5
〜0.55mmとなり、比較的破損が少なく、強度面の
物性値が結果的に15〜20%向上した。 Therefore, by applying this invention, the reference measurement time T 0
Molding was performed with the material supply basic control value t 0 set to 10 seconds, and the correction coefficient K set to 0.5. the result,
The actual weighing time T1 varied only between 14.6 and 15.4 seconds, and the appearance and strength of the molded product obtained were good, and the quality was within a certain good range. It was sad. In particular, in the case of polypropylene mixed with glass fibers, etc., there is less damage to the glass fibers, etc., and for example, polypropylene with an average glass fiber length of 0.7 mm is used.
In the case of polypropylene mixed with 30% by weight, the average glass fiber length decreases to 0.4 to 0.45 mm when the molding material is fed from the conventional hopper described above, but according to the present invention, the average glass fiber length decreases to 0.5 mm.
~0.55mm, with relatively little damage and physical properties in terms of strength improved by 15-20%.
以上の説明によつて理解されるように、この発
明によれば、下記の効果が得られる。
As understood from the above explanation, according to the present invention, the following effects can be obtained.
(1) 材料供給装置を備え、飢餓フイード状態に成
形する射出機に於いて、成形中の可塑化工程で
の計量時間のバラツキが最小限度に抑制される
ので、成形品の外観、強度等の品質が向上しか
つその均質化が得られる。特に、ガラス繊維、
カーボン繊維等の充填物を含んだ成形材料に於
いて、充填物の破損が軽減するので、成形品の
品質が著しく向上する。(1) In an injection machine that is equipped with a material supply device and molds in a starvation feed state, variations in metering time during the plasticization process during molding are suppressed to a minimum, so the appearance, strength, etc. of the molded product can be improved. The quality is improved and its homogenization is obtained. In particular, glass fiber
In a molding material containing a filler such as carbon fiber, damage to the filler is reduced, so the quality of the molded product is significantly improved.
(2) 構造が簡素であり、材料供給装置を備える通
常の射出機に、容易に適用できる。(2) The structure is simple and can be easily applied to a normal injection machine equipped with a material supply device.
(3) 成形材料の計測値、射出シリンダ内の材料の
量、各シヨツト毎の成形材料供給量が略一定に
なるので、成形材料の熱的履歴が略等しくな
り、熱的に不安定な成形材料の成形にも有効で
ある。(3) Since the measured value of the molding material, the amount of material in the injection cylinder, and the amount of molding material supplied for each shot are approximately constant, the thermal history of the molding material is approximately the same, resulting in thermally unstable molding. It is also effective in molding materials.
(4) 計量時間の設定変更により、成形材料の混練
状態を容易に変えることができる。即ち、計量
時間の設定変更により、射出シリンダ内の材料
の量が変わり、飢餓フイールド状態も変化す
る。これにより、射出スクリユの圧縮比が変化
するので、射出スクリユを変えることなく、異
なつた混練状態が得られる。また、高粘度の成
形材料を用いる際、可塑変トルクの定格越えを
防止できる。(4) By changing the measurement time setting, the kneading state of the molding material can be easily changed. That is, changing the metering time setting changes the amount of material in the injection cylinder and changes the starvation field condition. This changes the compression ratio of the injection screw, so different kneading conditions can be obtained without changing the injection screw. Furthermore, when using a high viscosity molding material, it is possible to prevent the plastic torque from exceeding the rated value.
(5) 成形材料の供給時期は、可塑化工程完了点か
ら次の可塑化工程開始直前までの間とすれば、
良好に上記諸効果が発揮される。また、この間
の任意の時期に成形材料を供給でき、成形工程
の管理が容易である。(5) The timing of supply of molding material is from the completion of the plasticizing process to just before the start of the next plasticizing process.
The above effects are well exhibited. Furthermore, the molding material can be supplied at any time during this period, making it easy to manage the molding process.
第1図は、この発明の1実施例を示すブロツク
図、第2図は、同じく構成要素の配置図、第3図
は、同じくフローチヤートである。
1:射出機、2:材料供給装置、3:計量時間
検出機、4:判定手段、5:補正手段、6:基本
制御値設定手段、21:材料供給部、22:混練
部、23:計量部、24:ノズル、25:金型、
T1:実際の計量時間、T0:基準計量時間、t0:
材料供給量基本制御値、t:制御信号、K:修正
係数。
FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a layout diagram of the constituent elements, and FIG. 3 is a flowchart. 1: Injection machine, 2: Material supply device, 3: Measuring time detector, 4: Judgment means, 5: Correction means, 6: Basic control value setting means, 21: Material supply section, 22: Kneading section, 23: Measurement Part, 24: Nozzle, 25: Mold,
T 1 : Actual weighing time, T 0 : Reference weighing time, t 0 :
Material supply amount basic control value, t: control signal, K: correction coefficient.
Claims (1)
部へ成形材料を供給するに際し、過塑化工程時の
実際の計量時間を計量時間検出器にて検出し、該
計量時間と予め設定した基準計量時間との差を判
定手段にて判定し、その判定結果に基づいて材料
供給装置による材料供給量を制御することを特徴
とする射出機の材料供給量制御方法。 2 材料供給装置としてのスクリユフイーダから
材料供給部へ供給された成形材料が、噴出スクリ
ユにより、混練部にて可塑化され、計量部に移送
後に、ノズルから噴出される射出機に於いて、該
計量部での成形材料の実際の計量時間を検出する
計量時間検出器と、成形材料に応じた材料供給量
基本制御値を設定する基本制御値設定手段と、前
記検出された計量時間と予め設定した基準計量時
間との差を判定する判定手段と、該判定手段の判
定結果に修正係数を乗じた絶対値を補正量とし、
基準計量時間よりも計量時間のほうが長いとき、
材料供給量基本制御値に補正量を加算し、基準計
量時間よりも計量時間のほうが短いとき、材料供
給量基本制御値から補正量を減算して、制御信号
を得る補正手段とを備え、該制御信号に基づいて
前記スクリユフイーダを駆動することを特徴とす
る射出機の材料供給量制御装置。 3 材料供給装置の駆動が、可塑化工程完了時か
ら次の可塑化工程直前までの間に行われる特許請
求の範囲第2項記載の射出機の材料供給量制御装
置。[Claims] 1. In an injection machine equipped with a material supply device, when supplying molding material to the material supply section, the actual measurement time during the overplasticization process is detected by a measurement time detector, and the A method for controlling the amount of material supplied to an injection machine, characterized in that a difference between a metering time and a preset reference metering time is determined by a determining means, and the amount of material supplied by a material supply device is controlled based on the determination result. 2 The molding material supplied from the screw feeder as a material supply device to the material supply section is plasticized in the kneading section by the jetting screw, and after being transferred to the metering section, the injection machine injects it from the nozzle. a metering time detector for detecting the actual metering time of the molding material at the section; a basic control value setting means for setting a material supply amount basic control value according to the molding material; a determination means for determining the difference from the reference measurement time, and an absolute value obtained by multiplying the determination result of the determination means by a correction coefficient as a correction amount;
When the weighing time is longer than the standard weighing time,
and a correction means for obtaining a control signal by adding a correction amount to the material supply amount basic control value and subtracting the correction amount from the material supply amount basic control value when the measurement time is shorter than the reference measurement time. A material supply amount control device for an injection machine, characterized in that the screw feeder is driven based on a control signal. 3. The material supply amount control device for an injection machine according to claim 2, wherein the material supply device is driven from the time of completion of the plasticizing step to just before the next plasticizing step.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32950087A JPH01171830A (en) | 1987-12-28 | 1987-12-28 | Material feed control method for injection machine and its device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32950087A JPH01171830A (en) | 1987-12-28 | 1987-12-28 | Material feed control method for injection machine and its device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01171830A JPH01171830A (en) | 1989-07-06 |
JPH0455849B2 true JPH0455849B2 (en) | 1992-09-04 |
Family
ID=18222066
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP32950087A Granted JPH01171830A (en) | 1987-12-28 | 1987-12-28 | Material feed control method for injection machine and its device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01171830A (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2911560B2 (en) * | 1990-07-24 | 1999-06-23 | 株式会社小松製作所 | Error detection method for injection molding machines |
JP5546123B2 (en) * | 2008-12-25 | 2014-07-09 | 株式会社ソディック | Pre-plastic injection device |
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 |
JP5558313B2 (en) | 2010-10-27 | 2014-07-23 | 住友重機械工業株式会社 | Injection molding machine |
JP5543632B2 (en) | 2012-07-26 | 2014-07-09 | ファナック株式会社 | Injection molding machine having a resin supply amount adjustment unit |
AT525189B1 (en) * | 2021-06-16 | 2023-06-15 | Engel Austria Gmbh | Method and computer program product for improving a cycle time |
CN116100772B (en) * | 2023-02-15 | 2023-08-25 | 浙江博创机械有限公司 | Overheat protection method and overheat protection system for injection molding machine |
-
1987
- 1987-12-28 JP JP32950087A patent/JPH01171830A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH01171830A (en) | 1989-07-06 |
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