JPH0528970B2 - - Google Patents
Info
- Publication number
- JPH0528970B2 JPH0528970B2 JP62331705A JP33170587A JPH0528970B2 JP H0528970 B2 JPH0528970 B2 JP H0528970B2 JP 62331705 A JP62331705 A JP 62331705A JP 33170587 A JP33170587 A JP 33170587A JP H0528970 B2 JPH0528970 B2 JP H0528970B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- speed
- closing
- deceleration
- completion position
- 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 - Lifetime
Links
- 238000001746 injection moulding Methods 0.000 claims description 14
- 238000001514 detection method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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型開閉制御装置に係わる
り、特に型閉め時あるいは型開き時に移動金型を
移動する際の低速走行の距離の設定を容易にした
射出成形機の型開閉制御装置に関する。Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a mold opening/closing control device for an injection molding machine, and in particular to a device for controlling the opening and closing of a mold in an injection molding machine. This invention relates to a mold opening/closing control device for an injection molding machine that is easy to set up.
（従来技術）
第４図は射出成形機の型開閉制御装置の概略図
を示すものであり固定金型Ｆ、移動金型Ｍ、型開
閉ピストン６、型開閉シリンダ５、制御装置１、
油圧ユニツト２、ポンプ３、油圧タンク４、位置
スケール７、位置検出ヘツド８から構成されてい
る。制御装置１には型開閉動作に必要なパラメー
タを入力するパラメータ入力部１−１と入力した
パラメータや機械の状態を表示する表示部１−２
がある。金型（移動金型Ｍ）の開閉動作は、制御
装置１からの型開閉指令信号、パラメータ入力部
１−１で設定された設定値に基づく速度指令信号
を油圧ユニツト２に入力することにより型開閉シ
リンダ５の油室５−１，５−２に流入、流出させ
る油の流入、流出の方向並びに油量を変化させる
ことにより型開閉ピストン６に加える圧力の方
向、大きさを変化させて行われる。移動金型Ｍの
位置は型閉完了点を原点として位置スケール７に
そつて、移動金型Ｍにアームを介して取り付けた
位置検出ヘツド８を移動させることにより位置パ
ルスＰを発生させ原点からのパルス数をカウント
する事により原点からの現在位置が表示部１−２
に表示されるようになつている。第５図に型開閉
動作時の移動金型Ｍの位置と速度の関係を示す。
同図で点Ｂは型閉め完了位置を、点Ａは型開き完
了位置をあらわし距離ABが型開閉ストロークＬ
である。Vcは型閉の際の位置と速度の関係を示
すものであり、型開き完了位置Ａで起動された
後、高速型閉め速度まで増速され高速型閉め速度
で減速開始位置B1まで移動した後、減速が開始
され低速型閉じ速度の許される最大速度である低
速型閉じ許容MAX速度（減速完了位置B2の速
度）以下に減速された後、固定金型Ｆと接触する
ようになつている。同様にVoは型開きの際の移
動金型Ｍの位置と速度の関係を示すものであり型
閉め完了点Ｂで起動され高速型開き速度まで増速
され高速型開き速度で低速型開き開始位置A1ま
で移動した後、減速が開始され型開き完了位置で
停止するようになつている。型開閉動作をさせる
に際して移動金型Ｍに以上にのべるような動きを
させるには射出成形機に金型を取り付けた後、制
御装置１のパラメータ入力部１−１からストロー
クＬ、高速型閉め速度、減速開始位置B1、高速
型開き速度、低速型開き開始位置A1、型開き完
了位置Ａをパラメータとして入力しなければなら
ない。(Prior art) Fig. 4 shows a schematic diagram of a mold opening/closing control device of an injection molding machine, and includes a fixed mold F, a movable mold M, a mold opening/closing piston 6, a mold opening/closing cylinder 5, a control device 1,
It is composed of a hydraulic unit 2, a pump 3, a hydraulic tank 4, a position scale 7, and a position detection head 8. The control device 1 includes a parameter input section 1-1 for inputting parameters necessary for mold opening/closing operations, and a display section 1-2 for displaying input parameters and machine status.
There is. The opening/closing operation of the mold (moving mold M) is performed by inputting a mold opening/closing command signal from the control device 1 and a speed command signal based on the set value set in the parameter input section 1-1 to the hydraulic unit 2. This is done by changing the direction and magnitude of the pressure applied to the mold opening/closing piston 6 by changing the direction and amount of oil flowing into and out of the oil chambers 5-1, 5-2 of the opening/closing cylinder 5. be exposed. The position of the movable mold M is determined by moving the position detection head 8 attached to the movable mold M via an arm along the position scale 7 with the mold closing completion point as the origin, thereby generating a position pulse P and moving it from the origin. By counting the number of pulses, the current position from the origin is displayed on display section 1-2.
It is now displayed in FIG. 5 shows the relationship between the position and speed of the movable mold M during mold opening/closing operations.
In the figure, point B represents the mold closing completion position, point A represents the mold opening completion position, and the distance AB is the mold opening/closing stroke L.
It is. Vc indicates the relationship between the position and speed when closing the mold, and after being started at the mold opening completion position A, the speed was increased to a high mold closing speed and moved to the deceleration start position B 1 at the high mold closing speed. After that, deceleration is started and the speed is reduced to below the maximum permissible low speed mold closing speed (speed at deceleration completion position B 2 ), which is the maximum speed allowed for the low speed mold closing speed, and then it comes into contact with the fixed mold F. There is. Similarly, Vo indicates the relationship between the position and speed of the moving mold M when opening the mold, and it is started at the mold closing completion point B, increases to the high mold opening speed, and then reaches the low speed mold opening starting position at the high mold opening speed. After moving to A 1 , deceleration starts and stops at the mold opening completion position. In order to make the movable mold M move more smoothly when opening and closing the mold, after installing the mold in the injection molding machine, set the stroke L and high-speed mold closing speed from the parameter input section 1-1 of the control device 1. , deceleration start position B 1 , high speed mold opening speed, low speed mold opening start position A 1 , and mold opening completion position A must be input as parameters.
（発明が解決しようとする問題点）
以上のパラメータの設定に際して減速開始位置
B1の設定は移動速度が低速型閉じ許容MAX速度
以下になつてからの移動距離（減速完了位置B2
から型閉め完了位置Ｂまでの距離）が出来るだけ
短くなるように設定することが望ましい。何故な
ら低速域が長いことはサイクルタイムを長くする
事により生産性を低下させる原因になるからであ
る。しかし低速型閉め位置B1を型閉め完了位置
Ｂに近付けすぎると移動速度が低速型閉じ許容
MAX速度以下に減少しないうちに固定金具Ｆと
衝突する事になり金型破損の原因になる。従来減
速開始位置B1の設定は、パラメータ設定作業の
始めにBB1の距離を安全側に十分長くとり、型開
閉動作の状態をオペレータが目で観察しながら
徐々に短くしていくことにより行い、これはオペ
レータにとつて比較的面倒な注意を必要とする作
業であつた。(Problem to be solved by the invention) When setting the above parameters, the deceleration start position
The B 1 setting is the travel distance after the travel speed becomes less than the low-speed mold closing allowable MAX speed (deceleration completion position B 2
It is desirable to set the distance (distance from to the mold closing completion position B) to be as short as possible. This is because a long low speed range lengthens the cycle time and causes a decrease in productivity. However, if the low-speed mold closing position B 1 is brought too close to the mold closing completion position B, the moving speed will be lower than the allowable low-speed mold closing position.
Before the speed decreases below the MAX speed, it will collide with the fixture F, causing mold damage. Conventionally, the deceleration start position B 1 is set by setting the distance of BB 1 sufficiently long on the safe side at the beginning of the parameter setting work, and gradually shortening it while the operator visually observes the state of the mold opening/closing operation. This was a task that required relatively troublesome attention from the operator.
（発明の目的）
本発明は、上記の問題を解決するために成され
たものであり、本発明の目的は移動金型の低速走
行の距離の設定を容易にした射出成形機の型開閉
制御装置を提供するにある。(Object of the Invention) The present invention has been made to solve the above problems, and the purpose of the present invention is to provide mold opening/closing control for an injection molding machine that facilitates setting of the low-speed traveling distance of a moving mold. We are in the process of providing equipment.
（発明の概要）
本発明の射出成形機の型開閉制御装置は、金型
が開いた状態から移動金型を高速で型閉め位置近
くまで送り、型閉め位置手前で所定の速度（低速
型閉じ速度）に減速し、この低速型閉じ速度で固
定金型と接触させる射出成形機の型閉制御装置に
おいて、送り速度が前記低速型閉じ速度の許され
る最大速度である低速型閉じ許容MAX速度に減
速される位置（減速完了位置）を検出する手段
と、前記検出した減速完了位置から型閉め完了位
置までの距離を測定する手段と、前記測定した距
離を表示する手段と、を備えたことを特徴とす
る。(Summary of the Invention) The mold opening/closing control device of the injection molding machine of the present invention transports the movable mold at high speed from the mold open state to near the mold closing position, and returns the movable mold at a predetermined speed (low speed mold closing) before the mold closing position. In the mold closing control device of an injection molding machine, the feed speed is reduced to a maximum permissible low mold closing speed, which is the maximum allowable speed of the low mold closing speed. The present invention comprises means for detecting a deceleration position (deceleration completion position), means for measuring a distance from the detected deceleration completion position to a mold closing completion position, and means for displaying the measured distance. Features.
（発明の実施例）
以下に本発明の実施例について説明する。本発
明は以下のブロツク図で示す部分を新たに制御装
置１に付加することにより実現される。第１図に
おいて設定部１０には低速型閉じ閉じ許容MAX
速度が単位時間当たりの移動距離あるいは高速型
閉め速度に対するパーセントで設定される。カウ
ント部１４では移動金型Ｍが移動中、位置検出機
８から出力される位置パルスを一定時間間隔（周
期）ごとにカウントしカウント値を比較部１６に
出力する。パルス数換算部１２では設定部１０で
設定した速度をカウント部１４のカウント周期当
たりの移動距離に対応した位置パルス数に換算す
る。比較部１６ではパルス数換算部１２で求めた
値とカウント部１４でカウントした値を比較し一
致したとき位置検出部１８に一致信号を出力す
る。位置検出部１８では設定した原点Ｂから移動
金型Ｍの現在位置までの距離が位置検出機からの
出力信号パルスＰをアツプカウントあるいはダウ
ンカウントして得られるようになつており比較部
１６からの一致信号が入力された時その時点のカ
ウント値が低速型閉じ許容MAX速度に減速され
た位置（減速完了位置B2を）示す値として記憶
され長さの単位に換算してB2位置表示部２０に
送られ表示される。オペレータは表示されたB2
の位置（原点から減速完了位置B2間での距離）
をみて減速開始位置B1の位置をパラメータ設定
部１−１で設定し直す。(Examples of the invention) Examples of the invention will be described below. The present invention is realized by newly adding the parts shown in the block diagram below to the control device 1. In Fig. 1, the setting unit 10 has a low speed mold closing tolerance MAX.
The speed is set as a percentage of the moving distance per unit time or the high speed mold closing speed. The counting section 14 counts the position pulses output from the position detector 8 at regular time intervals (periods) while the movable mold M is moving, and outputs the count value to the comparison section 16. The pulse number conversion unit 12 converts the speed set by the setting unit 10 into the number of position pulses corresponding to the moving distance per counting period of the counting unit 14. The comparison section 16 compares the value obtained by the pulse number conversion section 12 and the value counted by the counting section 14, and outputs a coincidence signal to the position detection section 18 when they match. In the position detecting section 18, the distance from the set origin B to the current position of the movable mold M can be obtained by up-counting or down-counting the output signal pulse P from the position detecting device. When a coincidence signal is input, the count value at that time is stored as a value indicating the position (deceleration completion position B2 ) at which the speed has been decelerated to the maximum permissible low speed mold closing speed, and is converted into a length unit and displayed on the B2 position display. 20 and displayed. Operator displayed B 2
position (distance from the origin to the deceleration completion position B 2 )
Checking this, reset the deceleration start position B1 using the parameter setting section 1-1.
第２図は本発明の２番目の実施例を示すブロツ
ク図である。同図では減速完了位置B2位置を表
示するに際し複数回の型開閉動作を行い、複数回
検出したB2の位置の平均をB2位置表示部には表
示するようになつている。設定部１０では低速型
閉じ許容MAX速度と共に測定回数を設定し、位
置検出部１８では検出した結果を設定した回数だ
け記憶部２２に記憶し、演算部２４で平均した後
B2位置表示部２０に表示する。オペレータは表
示されたB2の位置（原点から減速完了位置B2ま
での距離）をみて減速開始位置B1の位置をパラ
メータ設定部１−１で設定し直す。 FIG. 2 is a block diagram showing a second embodiment of the invention. In the figure, when displaying the deceleration completion position B2 position, the mold opening/closing operation is performed multiple times, and the average of the B2 positions detected multiple times is displayed on the B2 position display section. In the setting section 10, the number of measurements is set together with the maximum allowable low-speed mold closing speed, and in the position detection section 18, the detected results are stored in the storage section 22 for the set number of times, and after being averaged in the calculation section 24.
B 2 Displayed on the position display section 20. The operator looks at the displayed position B2 (distance from the origin to the deceleration completion position B2 ) and resets the deceleration start position B1 using the parameter setting section 1-1.
第３図は本発明の３番目の実施例を示すブロツ
ク図である。同図では検出した減速完了位置B2
の位置（原点からの距離１）に基づいてパラメー
タ設定部１−１で設定した減速開始位置B1（原点
からの距離１B1）を自動的に修正するようになつ
ている。設定部１０では低速型閉じ許容MAX速
度、測定回数のほか指定したい減速完了位置B2
（原点Ｂから減速完了位置B2までの距離ｓが入力
される。演算部２４では測定して得られた減速完
了位置B2の位置から設定したB2の位置を引き算
（１−ｓ）しその結果をB1位置設定部２６に送り
B1位置設定部２６では送られた値だけB1位置を
原点に近付けるようにB1位置を1B1−（１−ｓ）に
修正する。 FIG. 3 is a block diagram showing a third embodiment of the present invention. In the figure, the detected deceleration completion position B 2
The deceleration start position B 1 (distance 1 B1 from the origin) set in the parameter setting section 1-1 is automatically corrected based on the position (distance 1 from the origin). In the setting section 10, you can specify the maximum allowable low speed mold closing speed, the number of measurements, and the desired deceleration completion position B 2
(The distance s from the origin B to the deceleration completion position B2 is input. The calculation unit 24 subtracts (1-s) the set position of B2 from the measured deceleration completion position B2 . Send the result to the B1 position setting section 26
The B1 position setting unit 26 corrects the B1 position to 1 B1 -(1-s) so as to move the B1 position closer to the origin by the sent value.
以上の説明では型閉め動作時の低速走行の距離
の検出についてのみ説明したが型開き動作時の低
速走行の距離も同様にして検出できることは勿論
である。 In the above explanation, only the detection of the distance traveled at low speed during the mold closing operation has been described, but it goes without saying that the distance traveled at low speed during the mold opening operation can also be detected in the same manner.
（発明の効果）
以上にのべたように本発明によれば型開閉動作
における低速走行の距離を簡単に設定できるの
で、パラメータ設定に要する時間を短くすること
が可能になり、生産性を向上させる射出成形機の
型閉制御装置を提供することができる。(Effects of the Invention) As described above, according to the present invention, it is possible to easily set the distance of low-speed travel during the mold opening/closing operation, which makes it possible to shorten the time required for parameter setting, thereby improving productivity. A mold closing control device for an injection molding machine can be provided.
第１図は本発明の第１の実施例を示すブロツク
図、第２図は本発明の第２の実施例を示すブロツ
ク図、第３図は本発明の第３の実施例を示すブロ
ツク図、第４図は射出成形機の型開閉制御装置の
概略図、第５図は型開閉動作時の移動金型の位置
と速度の関係を示す図である。
FIG. 1 is a block diagram showing a first embodiment of the invention, FIG. 2 is a block diagram showing a second embodiment of the invention, and FIG. 3 is a block diagram showing a third embodiment of the invention. , FIG. 4 is a schematic diagram of a mold opening/closing control device of an injection molding machine, and FIG. 5 is a diagram showing the relationship between the position and speed of a movable mold during mold opening/closing operations.
１ 固定盤２と支持盤３の間に渡された複数のタ
イバー４に移動盤５が移動自在に設けられ、この
移動盤５は前記支持盤３を支点にして伸縮するト
グルリンク６により移動駆動され、前記支持盤３
は前記タイバー４の端部に形成されたねじ部４ａ
に螺合されて同期回転する雌ねじ部材８によつて
前記固定盤２に離接方向に移動駆動され、前記雌
ねじ部材８は回転駆動機構９，１１により回転駆
動されるトグル式型締装置の型厚調整装置におい
て、
前記回転駆動機構９，１１に連結されて回転し
前記支持盤３の移動量を検出する位置検出センサ
１５と、該位置検出センサ１５の出力信号を受け
前記トグルリンク６を伸ばした状態の移動盤５と
固定盤２との間の型厚寸法の現在値Kaに、支持
盤３が移動された際に、前記位置検出センサ１５
で検出された移動量を加減して、加減された後の
現在値Kaを保持する現在値保持回路２０と、所
定の金型に対して所定の型締力が生じるような型
締型厚寸法の設定値Ｋを入力する型厚設定部２２
と、前記現在値保持回路２０で保持された現在値
Kaと前記型厚設定部２２の設定値Ｋとを比較し
て支持盤３の移動方向を判断する型厚比較回路２
３と、該型厚比較回路２３で判断された支持盤３
の今回の移動方向と支持盤３の前回の移動方向と
1 A movable plate 5 is movably provided on a plurality of tie bars 4 passed between the fixed plate 2 and the support plate 3, and the movable plate 5 is movably driven by a toggle link 6 that expands and contracts with the support plate 3 as a fulcrum. and the support plate 3
is a threaded portion 4a formed at the end of the tie bar 4.
The mold of the toggle type mold clamping device is driven to move toward and away from the stationary plate 2 by a female threaded member 8 that is screwed together and rotates synchronously with the fixed platen. The thickness adjustment device includes a position detection sensor 15 connected to the rotary drive mechanisms 9 and 11 to rotate and detect the amount of movement of the support plate 3, and a position detection sensor 15 that extends the toggle link 6 upon receiving an output signal from the position detection sensor 15. When the support plate 3 is moved to the current value Ka of the mold thickness dimension between the movable plate 5 and the fixed plate 2 in the state where the position detection sensor 15
A current value holding circuit 20 that adjusts the amount of movement detected by and holds the adjusted current value Ka, and a clamping mold thickness dimension that generates a predetermined clamping force for a predetermined mold. Mold thickness setting section 22 for inputting the set value K of
and the current value held by the current value holding circuit 20.
A mold thickness comparison circuit 2 that compares Ka with the set value K of the mold thickness setting section 22 to determine the moving direction of the support plate 3.
3, and the support plate 3 determined by the mold thickness comparison circuit 23.
The current movement direction of support plate 3 and the previous movement direction of support plate 3.
Claims (1)
度（低速型閉じ速度）に減速し、この低速型閉じ
速度で固定金型と接触させる射出成形機の型開閉
制御装置において、 送り速度が前記低速型閉じ速度の許される最大
速度である低速型閉じ許容MAX速度に減速され
る位置（減速完了位置）を検出する手段と、前記
検出した減速完了位置から型閉め完了位置までの
距離を測定する手段と、前記測定した距離に基づ
いて減速開始位置をシフトさせる手段と、を有す
ることを特徴とした射出成形機の型開閉制御装
置。 ４ シフトさせる手段が、測定した減速完了位置
から型閉め完了位置までの距離１の測定結果に基
づいて、減速開始位置Ｂ１を、減速完了位置から
型閉め完了位置までの距離がゼロあるいは事前に
設定した最小距離ｓになるようにシフトさせるこ
とを特徴とした特許請求の範囲第３項記載の射出
成形機の型開閉制御装置。In a mold opening/closing control device for an injection molding machine, the feed speed is reduced to a predetermined speed (low mold closing speed) before the mold closing position, and the mold is brought into contact with a fixed mold at this low mold closing speed. A means for detecting a position (deceleration completion position) at which the speed is decelerated to the maximum permissible slow mold closing speed, which is the maximum allowable low mold closing speed, and a distance from the detected deceleration completion position to the mold closing completion position. A mold opening/closing control device for an injection molding machine, comprising: means for shifting a deceleration start position based on the measured distance. 4 The shifting means sets the deceleration start position B1 based on the measured distance 1 from the deceleration completion position to the mold closing completion position when the distance from the deceleration completion position to the mold closing completion position is zero or is set in advance. 4. The mold opening/closing control device for an injection molding machine according to claim 3, wherein the mold opening/closing control device for an injection molding machine is shifted to a minimum distance s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33170587A JPH01171828A (en) | 1987-12-25 | 1987-12-25 | Mold opening and closing control device of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33170587A JPH01171828A (en) | 1987-12-25 | 1987-12-25 | Mold opening and closing control device of injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01171828A JPH01171828A (en) | 1989-07-06 |
| JPH0528970B2 true JPH0528970B2 (en) | 1993-04-28 |
Family
ID=18246667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33170587A Granted JPH01171828A (en) | 1987-12-25 | 1987-12-25 | Mold opening and closing control device of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01171828A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2508537Y2 (en) * | 1990-11-06 | 1996-08-28 | 三菱重工業株式会社 | Clamping device for injection molding machine |
| JP2887118B2 (en) * | 1996-09-27 | 1999-04-26 | 株式会社名機製作所 | Control method of mold opening / closing speed of injection molding machine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4959160A (en) * | 1972-10-07 | 1974-06-08 | ||
| JPS5872431A (en) * | 1981-10-28 | 1983-04-30 | Toshiba Mach Co Ltd | Brake gear for injection molding machine |
| JPS58194524A (en) * | 1982-05-10 | 1983-11-12 | Tekunopurasu:Kk | Controlling method of operations of opening and closing mold in straight hydraulic mold clamping apparatus |
| JPS61114833A (en) * | 1984-11-09 | 1986-06-02 | Fanuc Ltd | System of displaying graphical state of operation of injection molding machine |
| JPS61197214A (en) * | 1985-02-27 | 1986-09-01 | Okuma Mach Works Ltd | Monitoring method for actuation of injection molding machine |
-
1987
- 1987-12-25 JP JP33170587A patent/JPH01171828A/en active Granted
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4959160A (en) * | 1972-10-07 | 1974-06-08 | ||
| JPS5872431A (en) * | 1981-10-28 | 1983-04-30 | Toshiba Mach Co Ltd | Brake gear for injection molding machine |
| JPS58194524A (en) * | 1982-05-10 | 1983-11-12 | Tekunopurasu:Kk | Controlling method of operations of opening and closing mold in straight hydraulic mold clamping apparatus |
| JPS61114833A (en) * | 1984-11-09 | 1986-06-02 | Fanuc Ltd | System of displaying graphical state of operation of injection molding machine |
| JPS61197214A (en) * | 1985-02-27 | 1986-09-01 | Okuma Mach Works Ltd | Monitoring method for actuation of injection molding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01171828A (en) | 1989-07-06 |
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