JP3160708B2 - Mold clamping force control method for electric injection molding machine - Google Patents
Mold clamping force control method for electric injection molding machineInfo
- Publication number
- JP3160708B2 JP3160708B2 JP06991096A JP6991096A JP3160708B2 JP 3160708 B2 JP3160708 B2 JP 3160708B2 JP 06991096 A JP06991096 A JP 06991096A JP 6991096 A JP6991096 A JP 6991096A JP 3160708 B2 JP3160708 B2 JP 3160708B2
- Authority
- JP
- Japan
- Prior art keywords
- clamping force
- mold clamping
- maximum
- molding machine
- injection molding
- 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
Description
【０００１】[0001]
【発明の属する技術分野】本発明はサーボモータによる
型締装置を用いた電動射出成形機の型締力制御方式に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a mold clamping force of an electric injection molding machine using a mold clamping device using a servomotor.
【０００２】[0002]
【従来の技術】サーボモータを用いた型締装置では、射
出開始から保圧・冷却工程が終了するまでの全型締時間
中の間、型締力が所定の変化パターンを呈するようにサ
ーボモータのトルクが制御される。したがって、型締力
を所定の値に保持する保持トルクを得るためにはサーボ
モータには必要な電流を供給し続ける必要がある。2. Description of the Related Art In a mold clamping apparatus using a servomotor, the torque of the servomotor is controlled so that the mold clamping force exhibits a predetermined change pattern during the entire mold clamping time from the start of injection to the end of the pressure-holding / cooling process. Is controlled. Therefore, in order to obtain a holding torque for holding the mold clamping force at a predetermined value, it is necessary to continuously supply a necessary current to the servomotor.
【０００３】この型締力の保持時間は、成形品（例えば
レンズ）によっては１時間になるような場合もある。そ
こで、従来の型締装置では、最大型締力を考慮し、この
最大型締力を発生するためのトルクを定格トルクとして
有するサーボモータを用いるようにしている。The holding time of the mold clamping force may be as long as one hour depending on the molded product (for example, a lens). Therefore, in the conventional mold clamping device, a servomotor having a torque for generating the maximum mold clamping force as a rated torque is used in consideration of the maximum mold clamping force.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、型締力
の変化パターンは、最大型締力の状態が長時間続くわけ
ではなく、全型締時間中に占める最大型締力の必要な時
間帯の割合は小さい。However, the change pattern of the mold clamping force does not mean that the state of the maximum mold clamping force lasts for a long time, and that the change pattern of the time during which the maximum mold clamping force occupies the entire mold clamping time is required. The proportion is small.
【０００５】そこで、本発明の課題は、小さな定格のサ
ーボモータによる型締装置を用いて定格以上の型締力を
得ることのできる電動射出成形機の型締力制御方式を提
供することにある。An object of the present invention is to provide a mold clamping force control method for an electric injection molding machine, which can obtain a mold clamping force exceeding the rating by using a mold clamping device using a servo motor with a small rating. .
【０００６】[0006]
【課題を解決するための手段】本発明によれば、サーボ
モータによる型締装置を用いた電動射出成形機におい
て、前記サーボモータに対する設定値を、あらかじめ定
めた型締力設定パターンにもとづいて与えるようにし、
前記型締力設定パターンは、前記サーボモータの持つ定
格トルクで規定される型締力より大きな最大型締力を持
つように設定され、前記最大型締力は前記型締力設定パ
ターンにおいて射出工程から保圧工程への切替え時点近
傍の所定時間だけ必要とされる型締力であることを特徴
とする電動射出成形機の型締力制御方式が得られる。According to the present invention, in an electric injection molding machine using a mold clamping device using a servomotor, a set value for the servomotor is given based on a predetermined mold clamping force setting pattern. So that
The pattern for setting the mold clamping force is a constant of the servomotor.
Has a maximum clamping force greater than the clamping force specified by the rated torque.
And the maximum mold clamping force is set to the mold clamping force setting parameter.
In the turn, near the point of switching from the injection process to the holding pressure process
A mold clamping force control method for an electric injection molding machine, characterized in that the mold clamping force is required only for a predetermined time nearby .
【０００７】なお、前記型締力設定パターンは、射出を
開始してからの経過時間と前記最大型締力を１として必
要な型締力に応じて決められた０〜１の間の数値とが１
対１の対応関係のテーブルに記憶されている。[0007] The mold clamping force setting pattern is a numerical value between 0 and 1 determined according to the required mold clamping force with the maximum mold clamping force being 1 with the elapsed time from the start of injection. Is 1
It is stored in a table of one-to-one correspondence.
【０００８】[0008]
【発明の実施の形態】図１、図２を参照して、本発明の
好ましい実施の形態について説明する。本発明が適用さ
れる型締装置は、サーボモータを用いた周知のタイプと
同じタイプであるので特に図示しないが、従来、例えば
５０（ｔ）の最大型締力を発生するサーボモータを用い
た型締装置を、５０（ｔ）を越える最大型締力を得るこ
とのできる型締装置として使用することができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described with reference to FIGS. The mold clamping device to which the present invention is applied is the same type as a well-known type using a servomotor, and is not particularly shown. The mold clamping device can be used as a mold clamping device capable of obtaining a maximum clamping force exceeding 50 (t).
【０００９】図１は型締装置におけるサーボモータに対
してドライバを通して設定値として与えるための型締力
設定パターンの一例を示す。この図から明らかなよう
に、通常、型締力は射出開始後、一定時間経過すると加
えられて急激に増加し、射出工程から保圧工程への切替
え時点直後にピークの設定型締力Ｆ0 に達して、そこか
ら漸減するという変化を呈する。そして、型締力が加え
られている全時間中に占める最大型締力の時間帯Ｔp は
非常に小さい。FIG. 1 shows an example of a mold clamping force setting pattern for giving a servo motor in a mold clamping device as a set value through a driver. As is apparent from this figure, usually, the mold clamping force is applied and abruptly increases after a lapse of a predetermined time after the start of injection, and the peak set mold clamping force F 0 immediately after switching from the injection process to the pressure holding process. , And changes gradually from there. Then, the time zone T p of the maximum clamping force in the total time the mold clamping force is added is very small.
【００１０】そこで、仮りに最大型締力が５０（ｔ）の
定格のサーボモータを用いた型締装置であっても、全型
締力保持時間中に占める最大型締力保持時間が図１に示
すように短時間であれば７０（ｔ）程度の最大型締力を
取り出すようにしても何ら問題は無い。Therefore, even if a mold clamping apparatus using a servo motor rated at a maximum mold clamping force of 50 (t), the maximum mold clamping force holding time occupying the entire mold clamping force holding time is shown in FIG. As shown in the figure, there is no problem even if the maximum mold clamping force of about 70 (t) is taken out for a short time.
【００１１】本発明はこのような原理にもとづいて、小
さな定格のサーボモータを用いた型締装置であっても定
格以上の最大型締力を得ることができるようにしてい
る。The present invention is based on such a principle, so that even a mold clamping device using a servo motor with a small rating can obtain a maximum clamping force exceeding the rating.
【００１２】図１の型締力設定パターンは、記憶装置を
用いて図２に示すようなテーブル形式で記憶される。図
２において、ｘは射出を開始してからの時間経過を示す
テーブル番号でｎは通常、１００〜１０００の間の数値
が使用される。言い換えれば、ｎ＝１０００で、射出開
始から型締力が０にされるまでの時間がＴw （ｓｅｃ）
であれば、テーブル番号はＴw ／１０００（ｓｅｃ）毎
に設定される。ｙは設定型締力Ｆ0 を最大型締力１とし
た場合に、各テーブル番号ｘに対応する型締力から換算
したプロフィール値で０〜１の間の数値で与えられる。The mold clamping force setting pattern shown in FIG. 1 is stored in a table format as shown in FIG. 2 using a storage device. In FIG. 2, x is a table number indicating the lapse of time from the start of injection, and n is usually a numerical value between 100 and 1000. In other words, when n = 1000, the time from the start of injection to the time when the mold clamping force is reduced to 0 is Tw (sec).
If, table number is set for each T w / 1000 (sec). y is a profile value converted from the mold clamping force corresponding to each table number x when the set mold clamping force F 0 is set to the maximum mold clamping force 1, and is given as a numerical value between 0 and 1.
【００１３】ここで、射出工程時間をＴi とし、射出を
開始してからの経過時間をｔとすると、図２のテーブル
からプロフィール値ｙを引用するためのテーブル番号ｘ
は、ｘ＝ｋ×ｔ／Ｔi で表わされる。なお、ｋはｔ＝Ｔ
i の時のテーブル番号である。ところで、上記式により
計算されるテーブル番号ｘは小数点の場合があり、この
小数点部分を補間する必要があるので、射出開始からの
任意の時点での型締力設定値Ｆr は、Ｘをｘの小数点を
切り捨てしたものとすると、Ｆr ＝｛［ｙ (Ｘ) −ｙ(
Ｘ−１ )］×（ｘ−Ｘ）＋ｙ( Ｘ−１ )｝×Ｆ0 で与え
られる。Here, assuming that the injection process time is T i and the elapsed time since the start of the injection is t, a table number x for quoting the profile value y from the table of FIG.
Is represented by x = k × t / T i . Note that k is t = T
Table number at the time of i . Incidentally, table number x calculated by the above formula may decimal, it is necessary to interpolate the decimal part, the mold clamping force setting value F r at any time from the start of injection, the X x Assuming that the decimal point is truncated, F r = ｛[y (X) −y (
Given by X-1)] × (x -X) + y (X-1)} × F 0.
【００１４】このような型締力設定パターンと、これを
記憶したテーブルとにより、射出を開始してからの型締
力の設定値が次々にサーボモータに与えられて型締力の
制御が行われる。そして、サーボモータはその定格を越
える最大型締力を短時間Ｔpだけ発生することになる
が、このような短時間のオーバロードはもともとサーボ
モータの設計時に考慮されているので、問題は生じな
い。その結果、本型締装置によれば、サーボモータの定
格により決まる型締力の１．５〜２倍程度の最大型締力
を得ることができる。According to the mold clamping force setting pattern and the table storing the pattern, the set value of the mold clamping force after the start of the injection is sequentially applied to the servomotor to control the mold clamping force. Will be Then, the servo motor is will occur only for a short time T p the maximum clamping force exceeding its rating, since such a short time overload are originally taken into account when designing a servo motor, a problem occurs Absent. As a result, according to the present mold clamping device, it is possible to obtain a maximum mold clamping force of about 1.5 to 2 times the mold clamping force determined by the rating of the servomotor.
【００１５】なお、上記の説明では、射出工程時間Ｔi
と設定型締力Ｆ0 とによりテーブルのプロフィール値ｙ
を算出するようにしているが、射出工程時間Ｔi 以外の
任意の時間を用いても良いし、設定型締力は最大型締力
を用いなくても良い。また、図２のようなテーブルによ
らずに、関数値により型締力を算出するようにしても良
い。In the above description, the injection process time T i
And the set mold clamping force F 0 , the table profile value y
While to calculate the, it may be used any time other than the injection process time T i, set clamping force may not use the maximum clamping force. Further, instead of using the table as shown in FIG. 2, the mold clamping force may be calculated by a function value.
【００１６】[0016]
【発明の効果】以上説明してきたように、本発明によれ
ば型締装置に用いられるサーボモータの定格で決まる型
締力以上の最大型締力を発生することができ、同じ定格
の従来機に比べてより大きな成形品の成形が可能とな
る。As described above, according to the present invention, it is possible to generate a maximum clamping force exceeding the clamping force determined by the rating of the servomotor used in the clamping device, and to provide a conventional machine having the same rating. It is possible to form a larger molded product as compared with.
【図１】本発明において使用される型締力設定パターン
の一例を示した図である。FIG. 1 is a diagram showing an example of a mold clamping force setting pattern used in the present invention.
【図２】図１に示された型締力設定パターンにもとづい
て型締力を算出するために用意される記憶テーブルの一
例を示した図である。FIG. 2 is a diagram showing an example of a storage table prepared for calculating a mold clamping force based on the mold clamping force setting pattern shown in FIG.
ｘ テーブル番号 ｙ テーブルのプロフィール値 x table number y table profile value
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 45/00 - 45/84 B29C 33/20 - 33/28 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) B29C 45/00-45/84 B29C 33/20-33/28
Claims (2)
動射出成形機において、前記サーボモータに対する設定
値を、あらかじめ定めた型締力設定パターンにもとづい
て与えるようにし、前記型締力設定パターンは、前記サ
ーボモータの持つ定格トルクで規定される型締力より大
きな最大型締力を持つように設定され、前記最大型締力
は前記型締力設定パターンにおいて射出工程から保圧工
程への切替え時点近傍の所定時間だけ必要とされる型締
力であることを特徴とする電動射出成形機の型締力制御
方式。1. An electric injection molding machine using a servo motor-based mold clamping device, wherein a set value for the servo motor is given based on a predetermined mold clamping force setting pattern, and the mold clamping force setting pattern is ,
Larger than the clamping force specified by the rated torque of the servo motor.
The maximum clamping force is set to have a maximum clamping force.
In the mold clamping force setting pattern
Required for a predetermined time near the point of switching to
Mold clamping force control method of an electric injection molding machine, which is a force.
て、前記型締力設定パターンは、射出を開始してからの
経過時間と前記最大型締力を１として必要な型締力に応
じて決められた０〜１の間の数値とが１対１の対応関係
のテーブルに記憶されていることを特徴とする電動射出
成形機の型締力制御方式。2. The mold clamping force control system according to claim 1, wherein the mold clamping force setting pattern is based on an elapsed time from the start of injection and the required mold clamping force with the maximum mold clamping force being one. And a numerical value between 0 and 1 determined in advance is stored in a one-to-one correspondence table.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06991096A JP3160708B2 (en) | 1996-03-26 | 1996-03-26 | Mold clamping force control method for electric injection molding machine |
| TW86107950A TW438661B (en) | 1996-03-26 | 1997-06-10 | Control device for motor-driven injection molding machine capable of generating larger clamping force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06991096A JP3160708B2 (en) | 1996-03-26 | 1996-03-26 | Mold clamping force control method for electric injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09254212A JPH09254212A (en) | 1997-09-30 |
| JP3160708B2 true JP3160708B2 (en) | 2001-04-25 |
Family
ID=13416333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06991096A Expired - Fee Related JP3160708B2 (en) | 1996-03-26 | 1996-03-26 | Mold clamping force control method for electric injection molding machine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3160708B2 (en) |
| TW (1) | TW438661B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010012500A (en) * | 2008-07-04 | 2010-01-21 | Toyo Mach & Metal Co Ltd | Die-casting machine |
| JP2010012502A (en) * | 2008-07-04 | 2010-01-21 | Toyo Mach & Metal Co Ltd | Die-casting machine |
-
1996
- 1996-03-26 JP JP06991096A patent/JP3160708B2/en not_active Expired - Fee Related
-
1997
- 1997-06-10 TW TW86107950A patent/TW438661B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| TW438661B (en) | 2001-06-07 |
| JPH09254212A (en) | 1997-09-30 |
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