JPH09207184A - Mold clamping method of injection molding machine - Google Patents
Mold clamping method of injection molding machineInfo
- Publication number
- JPH09207184A JPH09207184A JP1604996A JP1604996A JPH09207184A JP H09207184 A JPH09207184 A JP H09207184A JP 1604996 A JP1604996 A JP 1604996A JP 1604996 A JP1604996 A JP 1604996A JP H09207184 A JPH09207184 A JP H09207184A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- difference
- clamping force
- model
- 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.)
- Granted
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、射出成形機の型締
め方法に関するものであり、特に、使用金型に好適な型
締力を付与するための条件設定方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping method for an injection molding machine, and more particularly to a condition setting method for applying a suitable mold clamping force to a mold used.
【0002】[0002]
【従来の技術】一般に射出成形を行う際には、射出成形
機の対向する型盤の間に金型を挟持した後に、更に増締
めを行い、型締力を付与する。この増締めを行う機構と
して種々な方式が知られているが、多くの射出成形機
は、いわゆる「トグル式増締機構」を用いている。この
トグル式増締機構を有する射出成形機の一例を図2に示
す。2. Description of the Related Art Generally, in injection molding, a mold is clamped between opposing mold plates of an injection molding machine, and then the mold is further tightened to apply a mold clamping force. Although various methods are known as a mechanism for performing this tightening, many injection molding machines use a so-called "toggle type tightening mechanism". An example of an injection molding machine having this toggle type tightening mechanism is shown in FIG.
【0003】図2において、符号1は射出成形機の基台
であり、この基台1の上に固定型盤2が固定されてい
る。この固定型盤2の複数の隅部に、タイバー4が垂直
に取り付けられ、このタイバー4には、固定型盤2と対
向するエンドプレート3が装着されている。このエンド
プレート3には、アジャストナット5が取り付けられ、
このアジャストナット5はタイバー4の先端部に形成さ
れたネジ4aと螺合されていて、このアジャストナット
5を回転させることによって、エンドプレート3は、固
定型盤2に対して平行を保ったまま前後に移動できるよ
うになっている。In FIG. 2, reference numeral 1 is a base of an injection molding machine, and a fixed mold plate 2 is fixed on the base 1. Tie bars 4 are vertically attached to a plurality of corners of the fixed mold board 2, and end plates 3 facing the fixed mold board 2 are attached to the tie bars 4. An adjustment nut 5 is attached to the end plate 3,
The adjusting nut 5 is screwed with a screw 4a formed at the tip of the tie bar 4, and by rotating the adjusting nut 5, the end plate 3 is kept parallel to the fixed die plate 2. It can be moved back and forth.
【0004】固定型盤2とエンドプレート3との間に
は、固定型盤2と対向する可動型盤6が上記タイバー4
に支持されて装着されている。この可動型盤6は、エン
ドプレート3に取り付けられた型締用油圧シリンダ(ア
クチュエータ)7によりロッド7aを介して作動される
トグル機構8によって、エンドプレート3に対して平行
を保ったまま前後に移動することができるようになって
いる。このトグル機構8は、型締用油圧シリンダ7を作
動してロッド7aを伸長させたときはエンドプレート3
と可動型盤6との距離を最大値に固定し、ロッド7aを
短縮させたときはそれを縮小させることができる。Between the fixed mold plate 2 and the end plate 3, a movable mold plate 6 facing the fixed mold plate 2 is provided.
It is supported and attached to. This movable mold plate 6 is moved back and forth while keeping parallel to the end plate 3 by a toggle mechanism 8 operated by a mold clamping hydraulic cylinder (actuator) 7 attached to the end plate 3 via a rod 7a. It is possible to move. The toggle mechanism 8 operates when the mold clamping hydraulic cylinder 7 is operated to extend the rod 7a.
When the rod 7a is shortened by fixing the distance between the movable mold plate 6 and the movable mold plate 6 to the maximum value, it can be reduced.
【0005】エンドプレート3にはリングギヤ11が取
り付けられ、各アジャストナット5の外周に設けられた
ギヤとエンドプレート3に固定された油圧モータ12の
駆動ギヤ13とに噛み合わされ、この油圧モータ12
が、駆動ギヤ13とリングギヤ11とを介して各アジャ
ストナット5を同期して回転させるようになっている。A ring gear 11 is attached to the end plate 3, and meshes with a gear provided on the outer periphery of each adjustment nut 5 and a drive gear 13 of a hydraulic motor 12 fixed to the end plate 3.
However, the adjustment nuts 5 are synchronously rotated via the drive gear 13 and the ring gear 11.
【0006】この射出成形機を用いて射出成形を行うに
先だって、予め金型セット(以下、単に「金型」とい
う)9,10の厚みに対応してそれらの当接位置を決め
る「型厚調整」と、金型9,10に対して型締力を付与
するための増締量を決める「型締力調整」とが行われ
る。Prior to performing injection molding using this injection molding machine, the "mold thickness" is determined in advance corresponding to the thickness of the mold sets (hereinafter simply referred to as "mold") 9 and 10. Adjustment "and" adjustment of mold clamping force "for determining the tightening amount for applying the mold clamping force to the molds 9 and 10.
【0007】型厚調整は、トグル機構8を伸長させた状
態で、アジャストナット5を回転してエンドプレート3
を可動型盤6と一緒に固定型盤2の方向に、固定型盤2
側の金型9と可動型盤6側の金型10とが当接する型厚
位置まで移動させ、その位置を記憶させる。To adjust the mold thickness, the adjust nut 5 is rotated while the toggle mechanism 8 is extended, and the end plate 3 is rotated.
Together with the movable mold plate 6 in the direction of the fixed mold plate 2 and the fixed mold plate 2
The die 9 on the side and the die 10 on the movable die plate 6 side are moved to a die thickness position where they abut, and the position is stored.
【0008】次に型締力調整を行う。これは、エンドプ
レート3を型厚位置にセットした状態でトグル機構8を
縮小させ、アジャストナット5を更に回転してエンドプ
レート3を固定型盤2の方向に二次的に移動させる。こ
の二次移動量が、次にトグル機構8を伸長させたときに
型締力を付与することになる増締量に相当する。従って
この二次移動量を所望の型締力に対応して調整し記憶さ
せるのが型締力調整である。この二次移動量は、センサ
で測定する場合、パルス数で代用される。従って以後、
二次移動量を単に「パルス数」という。Next, the mold clamping force is adjusted. This causes the toggle mechanism 8 to shrink while the end plate 3 is set at the die thickness position, and the adjustment nut 5 is further rotated to move the end plate 3 in the direction of the fixed die plate 2 secondarily. This secondary movement amount corresponds to the tightening amount that will apply the mold clamping force when the toggle mechanism 8 is extended next time. Therefore, it is the mold clamping force adjustment that adjusts and stores this secondary movement amount corresponding to the desired mold clamping force. When the sensor measures the secondary movement amount, the number of pulses is substituted. Therefore,
The secondary movement amount is simply referred to as "pulse number".
【0009】一般に、金型の型締めに際しては、増締量
(上記の二次移動量)を増大するとそれに比例して型締
力が増大する。しかし、金型の厚さ(型厚)が変わる
と、増締量と型締力との比例関係における比例定数は変
化する。すなわち、限度内で金型の厚さ(型厚)が厚い
場合に比べ、型厚が薄いほど、一定の増締量(パルス
数)に対する型締力は増大する。そこで、従来から射出
成形の作業現場においては、射出成形機にセットする金
型の厚みが変わっても所定の型締力が得られるように、
型厚と増締量(パルス数)との関係(比例定数)を、予
め厚みの異なる2個以上のモデル金型による実験により
求め、実際に使用する金型(以下、「実使用金型」とい
う)の厚みと上記モデル金型の厚みとの比例配分により
使用金型の前記比例定数を求め、この比例定数から増締
量(パルス数)を設定する型締力調整が行われている。Generally, when the mold is clamped, the mold clamping force increases in proportion to the increase of the tightening amount (the above-mentioned secondary movement amount). However, when the die thickness (die thickness) changes, the proportional constant in the proportional relationship between the tightening amount and the die clamping force changes. That is, as compared with the case where the thickness of the die (thickness of the die) is thick within the limit, the thinner the die thickness, the greater the die clamping force for a given amount of tightening (pulse number). Therefore, in the conventional injection molding work site, in order to obtain a predetermined mold clamping force even if the thickness of the mold set in the injection molding machine changes,
The relationship (proportional constant) between the mold thickness and the tightening amount (pulse number) was obtained in advance by an experiment using two or more model molds with different thicknesses, and the mold actually used (hereinafter, “actual mold”). That is, the proportional constant of the used mold is obtained by proportional distribution of the thickness of the model mold and the thickness of the model mold, and the mold clamping force is adjusted by setting the tightening amount (pulse number) from the proportional constant.
【0010】[0010]
【発明が解決しようとする課題】上記のように、従来の
型締力調整においては、所定の型締力を得るために型厚
に応じて増締量を補正する方法が採用されているが、こ
の方法によると、型厚と増締量とによって設定した型締
力の期待値と、実際にその条件で実使用金型を用いて実
測した型締力とが異なる場合があることがわかった。そ
の結果、以下のような問題が発生する。 射出成形機の仕様型締力の最大の設定付近に対して上
記の計算に従って増締量を設定すると、実際にはトグル
機構8を伸長させようとしても型締用油圧シリンダの力
が不足し、トグル機構8が完全に伸長することができ
ず、目標とする型締力が発生せず、型締めできない場合
が生じる。 設定値より実際の型締力が大となって、型内に発生す
るガスの逃げ不良、金型の破損などが起こり、またトグ
ル機構8のブッシュが摩耗して射出成形機の寿命を短縮
させる場合もある。 設定値より実際の型締力が小さくなって、バリの発
生、成形物の寸法不良などを起こす場合がある。As described above, in the conventional mold clamping force adjustment, a method of correcting the tightening amount according to the mold thickness is adopted in order to obtain a predetermined mold clamping force. According to this method, it can be seen that the expected value of the mold clamping force set by the mold thickness and the tightening amount may differ from the mold clamping force actually measured using the actual mold under the conditions. It was As a result, the following problems occur. When the tightening amount is set according to the above calculation in the vicinity of the maximum setting of the mold clamping force of the injection molding machine, the force of the mold clamping hydraulic cylinder becomes insufficient even if the toggle mechanism 8 is actually extended. In some cases, the toggle mechanism 8 cannot be fully extended, the target mold clamping force is not generated, and the mold cannot be clamped. If the actual mold clamping force becomes larger than the set value, the escape of gas generated in the mold may occur, the mold may be damaged, and the bushing of the toggle mechanism 8 may wear to shorten the life of the injection molding machine. In some cases. The actual mold clamping force may become smaller than the set value, and burrs may occur, and the dimension of the molded product may become defective.
【0011】上記の問題が発生する原因について研究の
結果、本発明者らは、上記の増締量と型締力との比例定
数が型厚のみに依存するものではなく、金型とそれを挟
む型盤との接触面積や金型の強度などにも依存するもの
であることを見いだし、本発明に到達した。従って本発
明の目的は、射出成形機において、実使用金型が変わっ
ても、型締力が期待値から外れない増締量を設定できる
射出成形機の型締め方法を提供することにある。As a result of research on the cause of the above problem, the present inventors found that the proportional constant between the tightening amount and the mold clamping force does not depend only on the mold thickness, but the mold and the mold. The inventors have found that it also depends on the contact area with the sandwiching mold plate, the strength of the mold, and the like, and reached the present invention. Therefore, an object of the present invention is to provide a mold clamping method for an injection molding machine, which can set a tightening amount in which the mold clamping force does not deviate from an expected value even when the actually used mold is changed.
【0012】[0012]
【課題を解決するための手段】上記の課題は、射出成形
機に装着した実使用金型に所定の型締力を付与するに要
する増締量を決定するに際して、標準となるモデル金型
について増締量と型締力との関係を実測により求め、こ
の実測値に、上記モデル金型と実使用金型との剛性値の
差に基づく補正を加える射出成形機の型締め方法を提供
することによって解決できる。[Means for Solving the Problems] The above-mentioned problems are related to a standard model mold when determining the amount of tightening required to apply a predetermined mold clamping force to an actually used mold mounted on an injection molding machine. A mold clamping method for an injection molding machine is provided in which the relationship between the tightening amount and the mold clamping force is obtained by actual measurement, and the measured value is corrected based on the difference in rigidity value between the model mold and the actually used mold. It can be solved by
【0013】上記の剛性値差は、モデル金型と実使用金
型との、射出成形機の金型を挟む型盤に対する接触面積
の差、ヤング率の差または構造に由来する剛性値の差の
いずれか1以上を含むものであることが好ましい。The difference in the above-mentioned rigidity values is the difference in the contact area between the model mold and the actually used mold with respect to the mold plate sandwiching the mold of the injection molding machine, the difference in Young's modulus or the difference in rigidity value derived from the structure. It is preferable to include any one or more of the above.
【0014】上記の剛性値差に基づく補正値は、剛性値
に差があって厚みに差がない少なくとも2個のモデル金
型のそれぞれについて増締量に対する型締力の比例定数
を実測により求め、これらの比例定数の差と、上記モデ
ル金型と実使用金型との剛性値差とから算出された補正
値によりなされたものであることが好ましい。The correction value based on the difference in rigidity value is obtained by actually measuring the proportional constant of the mold clamping force with respect to the tightening amount for each of at least two model molds having different rigidity values and no difference in thickness. It is preferable that the correction value is calculated from the difference between these proportional constants and the difference in rigidity between the model die and the actually used die.
【0015】[0015]
【発明の実施の形態】以下、本発明の実施の形態につい
て、図2に示したトグル式増締機構を有する射出成形機
を用いた実施例により説明する。この実施例において
は、基準となるモデル金型と実使用金型との剛性値差と
して、金型とこれを挟む射出成形機の型盤との接触面積
の差(以下、単に「面積差」という)のみを用いる方法
を示す。以下の説明において、従来の技術として説明し
た上記射出成形機の構成要素およびその作用に関する事
項は、説明を省略または簡略化する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described with reference to an embodiment using an injection molding machine having a toggle type tightening mechanism shown in FIG. In this embodiment, the difference in the rigidity value between the reference model mold and the actual mold is the difference in the contact area between the mold and the mold plate of the injection molding machine that sandwiches it (hereinafter, simply "area difference"). The method of using only) is shown. In the following description, the description of the components of the injection molding machine and the operations thereof described as the conventional technique will be omitted or simplified.
【0016】この実施例では、実使用金型Xおよび3個
のモデル金型G,H,Iを用いる。これらの金型はいず
れも全体として直方体をなすものであって、図2に示す
射出成形機の固定型盤2と可動型盤6との間にセットす
ることができる。セットされた状態において、これらの
型盤2,6と金型とはそれぞれ長方形の接触面で接触す
ることになる。これらの金型の諸元を以下に示す。In this embodiment, an actually used mold X and three model molds G, H and I are used. All of these molds form a rectangular parallelepiped as a whole, and can be set between the fixed mold plate 2 and the movable mold plate 6 of the injection molding machine shown in FIG. In the set state, the mold plates 2 and 6 and the mold are brought into contact with each other through rectangular contact surfaces. The specifications of these molds are shown below.
【0017】 接触面寸法mm 接触面積Scm2 厚みTmm 実使用金型X: 500×400 2000 300 モデル金型G: 400×305 1220 250 モデル金型H: 400×305 1220 400 モデル金型I: 580×400 2320 250 Contact surface dimensions mm Contact area Scm 2 Thickness Tmm Actual mold X: 500 × 400 2000 300 Model mold G: 400 × 305 1220 250 Model mold H: 400 × 305 1220 400 Model mold I: 580 × 400 2320 250
【0018】本実施例は、実使用金型Xを上記射出成形
機にセットして使用する場合に、任意の型締力Fを付与
するに要する増締量Pを、この実使用金型Xについて実
測することなく決定することを目的とするものである。In this embodiment, when the actually used mold X is set in the injection molding machine and used, the tightening amount P required to apply an arbitrary mold clamping force F is set to the actually used mold X. The purpose is to make a decision without actually measuring.
【0019】それぞれの金型について、上記射出成形機
を用いた増締めは、以下のように行った。先ず固定型盤
2と可動型盤6との間に金型をセットし、トグル機構8
を伸長させた状態で、アジャストナット5を回転してエ
ンドプレート3を可動型盤6と一緒に固定型盤2の方向
に、固定型盤2側の金型9と可動型盤6側の金型10と
が当接する位置まで移動し、その位置を記憶させ、型厚
調整を行う。次に、エンドプレート3を型厚位置にセッ
トした状態でトグル機構8を縮小させ、アジャストナッ
ト5を更に、付与すべき増締量Pに相当するパルス数だ
け回転させ、エンドプレート3を固定型盤2の方向に移
動させる。この状態で、トグル機構8を伸長すると金型
に型締力が作用する。Reinforcement of each mold using the above injection molding machine was carried out as follows. First, a mold is set between the fixed mold platen 2 and the movable mold platen 6, and the toggle mechanism 8
In a state in which is extended, the adjusting nut 5 is rotated to move the end plate 3 together with the movable mold plate 6 toward the fixed mold plate 2 toward the fixed mold plate 2 side mold 9 and the movable mold plate 6 side mold. The mold 10 is moved to the position where it abuts, the position is stored, and the mold thickness is adjusted. Next, with the end plate 3 set in the mold thickness position, the toggle mechanism 8 is contracted, and the adjusting nut 5 is further rotated by the number of pulses corresponding to the tightening amount P to be applied to fix the end plate 3 to the fixed mold. Move in the direction of board 2. When the toggle mechanism 8 is extended in this state, the mold clamping force acts on the mold.
【0020】モデル金型の増締めに際しては、4本のタ
イバー4の両端にそれぞれ1個当て(合計8個)のダイ
ヤルゲージ(図示せず)を装着し、増締めによって発生
するタイバー4の伸びを測定し、この伸び量から型締力
F(tf)を求めた。When tightening the model die, one dial gauge (not shown) is attached to each end of each of the four tie bars 4 (eight in total), and the tie bars 4 are stretched by the tightening. Was measured, and the mold clamping force F (tf) was determined from this elongation amount.
【0021】本実施例による実使用金型Xの増締量Pの
決定は、以下の手順により行われる。手順1 :先ず標準となるモデル金型について増締量と型
締力との関係を求める。 上記のモデル金型Gを標準金
型と定め、この標準金型Gについて、前記の増締め方法
によって、増締量Pを種々に変化させたときに得られる
型締力Fを測定し、増締量Pと型締力Fとの関係を一次
の最小自乗法により求めた。増締量Pと型締力Fとの関
係は比例関係であって、下記の式(1)で表されるもの
であった。 標準金型G: F=kG P=1.010P …(1) (ここで、kG は標準金型Gに関する増締量Pと型締力
Fとの関係式における比例定数である。) 図1に、上記式(1)のグラフを直線Gとして示す。The tightening amount P of the actually used mold X according to this embodiment is determined by the following procedure. Step 1 : First, find the relationship between the tightening amount and the mold clamping force for a standard model mold. The model mold G described above is defined as a standard mold, and the mold clamping force F obtained when the tightening amount P is variously changed by the above-described tightening method is measured for this standard mold G, and The relationship between the clamping amount P and the mold clamping force F was obtained by the first least square method. The relationship between the tightening amount P and the mold clamping force F is a proportional relationship and is represented by the following formula (1). Standard mold G: F = k G P = 1.010P (1) (where k G is a proportional constant in the relational expression between the tightening amount P and the mold clamping force F for the standard mold G). FIG. 1 shows the graph of the above formula (1) as a straight line G.
【0022】手順2:ここでは実使用金型Xと標準金型
Gとに厚み差があるので、この厚み差に基づく比例定数
の補正値ΔTを求める。標準金型Gと厚み差があって面
積差がないモデル金型Hを参照金型として用い、このモ
デル金型Hについて、標準金型Gの場合と同様にして増
締量Pを種々に変化させたときに得られる型締力Fを測
定し、増締量Pと型締力Fとの関係を一次の最小自乗法
により求める。増締量Pと型締力Fとの関係は比例関係
であって、下記の式(2)で表されるものであった。 モデル金型H: F=kH P=0.908P …(2) (ここで、kH はモデル金型Hに関する増締量Pと型締
力Fとの関係式における比例定数である。) 図1に、上記式(2)のグラフを直線Hとして示す。 Step 2 : Since there is a thickness difference between the actually used mold X and the standard mold G, the correction value ΔT of the proportional constant based on this thickness difference is obtained. A model die H having a thickness difference from the standard die G and no area difference is used as a reference die, and the tightening amount P is variously changed for this model die H in the same manner as in the case of the standard die G. The mold clamping force F obtained at this time is measured, and the relationship between the tightening amount P and the mold clamping force F is obtained by the first least square method. The relationship between the tightening amount P and the mold clamping force F is a proportional relationship and is represented by the following formula (2). Model Mold H: F = k H P = 0.908P ... (2) ( where, k H is a proportionality constant in relation to the Zoshime amount P and the mold clamping force F about the model die H.) In FIG. 1, the graph of the above formula (2) is shown as a straight line H.
【0023】手順3:上記のデータから、標準金型Gと
実使用金型Xとの厚み差に基づく比例定数の補正値ΔT
を算出する。これは、標準金型Gとモデル金型Hの厚み
差とそれぞれの上記比例定数kG ,kH の値から比例配
分によって、式(3)として求めることができる。 ΔT=(kH −kG )(TX −TG )/(TH −TG ) …(3) (ここでTX ,TG ,TH は、それぞれ実使用金型X,
標準金型G,モデル金型Hの厚みである。) Step 3 : From the above data, the correction value ΔT of the proportional constant based on the thickness difference between the standard mold G and the actual mold X
Is calculated. This can be obtained as the equation (3) by proportional distribution from the thickness difference between the standard mold G and the model mold H and the values of the proportional constants k G and k H. ΔT = (k H −k G ) (T X −T G ) / (T H −T G ) ... (3) (where T X , T G , and T H are the actual use mold X,
It is the thickness of the standard mold G and the model mold H. )
【0024】実使用金型Xにこの厚み差の補正を施すに
は、標準金型Gの比例定数kG に厚み差補正値ΔTを加
算すればよい。すなわち、厚み差の補正のみを施したと
きの実使用金型Xの増締量Pと型締力Fとの関係は式
(4)で表される。 実使用金型Xの厚み補正式: F=kXTP=(kG +ΔT)P …(4) (ここでkXTは実使用金型Xの厚み補正後の増締量Pと
型締力Fとの関係式における比例定数である。) 比例定数kXTは式(3)から、式(5)として求められ
る。 kXT=kG +(kH −kG )(TX −TG )/(TH −TG ) …(5) 式(5)に実数を入れて式(4)を求めると、実使用金
型Xの厚み補正後の比例関係は 実使用金型Xの厚み補正後: F=0.976P …(6) となる。図1に、上記式(6)のグラフを直線XT とし
て示す。To correct the thickness difference in the actually used mold X, the thickness difference correction value ΔT may be added to the proportional constant k G of the standard mold G. That is, the relationship between the tightening amount P and the mold clamping force F of the actually used mold X when only the thickness difference is corrected is expressed by the formula (4). Thickness correction formula of the actually used mold X: F = k XT P = (k G + ΔT) P (4) (where k XT is the tightening amount P and mold clamping force after the thickness correction of the actually used mold X) It is a constant of proportionality in the relational expression with F.) The constant of proportionality k XT is obtained from formula (3) as formula (5). k XT = k G + (k H −k G ) (T X −T G ) / (T H −T G ) ... (5) When a real number is added to the formula (5) to obtain the formula (4), After the thickness correction of the used mold X, the proportional relationship is as follows after the thickness correction of the actually used mold X: F = 0.976P (6). FIG. 1 shows the graph of the above formula (6) as a straight line X T.
【0025】手順4:標準金型Gと実使用金型Xとの面
積差に基づく補正を行う。上記のモデル金型Gを標準金
型と定め、参照金型として、標準金型Gと面積差があっ
て厚み差がないモデル金型Iを用いた。モデル金型Iに
ついて、標準金型Gの場合と同様にして増締量Pと型締
力Fとの関係を一次の最小自乗法により求めた。増締量
Pと型締力Fとの関係は比例関係であって、下記の式
(7)で表されるものであった。 モデル金型I: F=kI P=1.164P …(7) (ここで、kI はモデル金型Iに関する増締量Pと型締
力Fとの関係式における比例定数である。) 図1に、上記関係式(7)のグラフを直線Iとして示
す。 Step 4 : Correction is performed based on the area difference between the standard mold G and the actually used mold X. The above model mold G was defined as a standard mold, and as the reference mold, a model mold I having an area difference from the standard mold G and no thickness difference was used. For the model mold I, the relationship between the tightening amount P and the mold clamping force F was obtained by the first-order least squares method in the same manner as the standard mold G. The relationship between the tightening amount P and the mold clamping force F is a proportional relationship and is represented by the following formula (7). Model mold I: F = k I P = 1.164P (7) (where k I is a proportional constant in the relational expression between the tightening amount P and the mold clamping force F for the model mold I.) In FIG. 1, the graph of the relational expression (7) is shown as a straight line I.
【0026】手順5:標準金型Gと実使用金型Xとの面
積差に基づく補正は、以下のようにして行うことができ
る。標準金型Gと実使用金型Xとの面積差に基づく比例
定数の補正値ΔSを、標準金型Gとモデル金型Iの面積
差とそれぞれの上記比例定数kG ,kI の値から比例配
分によって、式(8)として求める ΔS=(kI −kG )(SX −SG )/(SI −SG ) …(8) (ここで、SX ,SG ,SI は、それぞれ実使用金型
X,標準金型G,モデル金型Iの型盤との接触面積であ
る。) Step 5 : The correction based on the area difference between the standard mold G and the actually used mold X can be performed as follows. The correction value ΔS of the proportional constant based on the area difference between the standard mold G and the actually used mold X is calculated from the area difference between the standard mold G and the model mold I and the respective proportional constants k G and k I. ΔS = (k I −k G ) (S X −S G ) / (S I −S G ) ... (8) (where S X , S G , S I Are contact areas with the mold plates of the actually used mold X, the standard mold G, and the model mold I, respectively.)
【0027】実使用金型Xにこの面積差補正を施すに
は、標準金型Gの比例定数kG に厚み差補正値ΔTを加
算したものに更に面積差補正値ΔSを加算すればよい。
すなわち、厚み差補正と面積差補正を施したときの実使
用金型Xの増締量Pと型締力Fとの関係は式(9)で表
される。 実使用金型X: F=kXP=(kG +ΔT+ΔS)P …(9) (ここで、kXは実使用金型Xの厚み差と面積差とを補
正後の増締量Pと型締力Fとの関係式における比例定数
である。) kG +ΔTは式(5)のkXTであるから、比例定数kX
は、式(10)により求められる。 kX=kXT+(kI −kG )(SX −SG )/(SI −SG ) …(10) すなわち、式(10)に実数を入れて式(9)を求める
と、実使用金型Xの厚み差と面積差とを補正後の比例関
係は 実使用金型X: F=1.085P …(11) となる。図1に、上記関係式(11)のグラフを直線X
として示す。In order to perform this area difference correction on the actually used mold X, the area difference correction value ΔS may be further added to the proportional constant k G of the standard mold G to which the thickness difference correction value ΔT is added.
That is, the relationship between the tightening amount P of the actually used mold X and the mold clamping force F when the thickness difference correction and the area difference correction are performed is expressed by the equation (9). Actual mold X: F = k X P = (k G + ΔT + ΔS) P (9) (where, k X is the tightening amount P after correction of the thickness difference and the area difference of the actual mold X. It is a proportional constant in the relational expression with the mold clamping force F.) Since k G + ΔT is k XT in the equation (5), the proportional constant k X
Is calculated by the equation (10). k X = k XT + (k I −k G ) (S X −S G ) / (S I −S G ) ... (10) That is, when a real number is inserted into the formula (10) to obtain the formula (9). The proportional relationship after correcting the thickness difference and the area difference of the actually used mold X is the actually used mold X: F = 1.085P (11). In FIG. 1, the graph of the relational expression (11) is shown by a straight line X.
As shown.
【0028】上記の式11、または図1の直線Xを用い
れば、実使用金型Xに付与したい任意の型締力Fに対応
する増締量Pを直ちに求めることができる。例えば、実
使用金型Xについて、80tfの型締力を負荷したい場
合には、式(11)、または図1の直線Xから73.7
3パルスの増締量を与えればよいことがわかる。試験の
ため、図2に示す射出成形機に実使用金型Xをセット
し、タイバー4にダイヤルゲージを装着した状態で増締
量Pを変化させたときに得られる型締力Fを実測する
と、その実測値は式(11)、または図1の直線Xとよ
い一致を示した。By using the above formula 11 or the straight line X in FIG. 1, the tightening amount P corresponding to an arbitrary mold clamping force F desired to be applied to the actually used mold X can be immediately obtained. For example, when it is desired to apply a mold clamping force of 80 tf to the actually used mold X, the formula (11) or the straight line X in FIG.
It is understood that the tightening amount of 3 pulses should be given. For the test, when the actually used mold X is set in the injection molding machine shown in FIG. 2 and the mold clamping force F obtained when the tightening amount P is changed with the dial gauge attached to the tie bar 4 is actually measured. The measured value showed good agreement with the equation (11) or the straight line X in FIG.
【0029】これに対して、従来の増締量決定方法は、
金型の厚みTに関する補正のみを行っていたものである
から、その補正は式(6)または図1の直線XT に相当
するものであり、接触面積が標準モデル金型と異なる実
使用金型については、実測値と計算値との誤差が大きい
ことがわかる。On the other hand, the conventional method for determining the tightening amount is
Since it is what was done only correction for the thickness T of the mold, the correction is equivalent to a straight line X T of formula (6) or Figure 1, the actual use gold contact area is different from the standard model mold As for the mold, it can be seen that there is a large error between the measured value and the calculated value.
【0030】上記の実施例の方法を用いれば、標準金型
に対して厚みTおよび/または接触面積Sが異なる任意
の実使用金型における増締量Pと型締力Fとの関係が、
その3元寸法を測定して式(11)に導入するか、また
は作図するだけで直ちに得られ、金型を変更する際の増
締量の決定を正確かつ迅速に行うことができる。By using the method of the above embodiment, the relationship between the tightening amount P and the mold clamping force F in an arbitrary actually used mold having a thickness T and / or a contact area S different from that of the standard mold is as follows.
The three-dimensional size is measured and introduced into the formula (11), or it is obtained immediately by drawing, and the amount of tightening when changing the mold can be accurately and quickly determined.
【0031】上記の実施例は、剛性値差として接触面積
の差のみを用いたが、一般に、剛性値差としては例えば
ヤング率の差または構造に由来する剛性値の差なども、
必要に応じて補正に用いることができる。例えば、用い
た標準モデル金型と実使用金型とのヤング率の差が無視
できない場合には、標準モデル金型(例えばG)と他の
条件が同じでヤング率のみが異なる参照用モデル金型J
を用意し、それぞれについて型締力Fと増締量Pとの関
係を求め、それぞれの比例定数kG ,kJ と、それぞれ
の金型のヤング率YG ,YJ と、実使用金型Xのヤング
率YX とから、ヤング率差による補正値ΔYを式(1
2)により求め、 ΔY=(kJ −kG )(YX −YG )/(YJ −YG ) …(12) この補正値を比例定数に加算して、式(13)を作成す
ればよい。 実使用金型X: F=kXP=(kG +ΔT+ΔS+ΔY)P …(13) (ここで、kXは実使用金型Xの厚み差と面積差とヤン
グ率差とを補正後の増締量Pと型締力Fとの関係式にお
ける比例定数である。)In the above embodiments, only the difference in contact area is used as the difference in rigidity value, but in general, the difference in rigidity value is, for example, the difference in Young's modulus or the difference in rigidity value derived from the structure.
It can be used for correction if necessary. For example, if the difference in Young's modulus between the used standard model mold and the actual mold is not negligible, the reference model mold has the same other conditions as the standard model mold (for example, G) but only the Young's modulus is different. Type J
, And the relationship between the mold clamping force F and the tightening amount P is calculated for each, and the proportional constants k G and k J , the Young's modulus Y G and Y J of each mold, and the actual mold used. From the Young's modulus Y X of X , the correction value ΔY due to the Young's modulus difference is calculated by the formula (1
2), ΔY = (k J −k G ) (Y X −Y G ) / (Y J −Y G ) ... (12) This correction value is added to the proportional constant to create the equation (13). do it. Actual use mold X: F = k X P = (k G + ΔT + ΔS + ΔY) P (13) (where, k X is an increase after the thickness difference, area difference and Young's modulus difference of the actual use mold X are corrected. It is a proportional constant in the relational expression between the clamping amount P and the mold clamping force F.)
【0032】同様に、例えば金型のプレート数、各プレ
ートの厚みなど、用いた標準モデル金型と実使用金型と
の構造値の差が無視できない場合には、標準モデル金型
(例えばG)と他の条件が同じで構造値のみが異なる参
照用モデル金型Kを用意し、それぞれについて型締力F
と増締量Pとの関係を求め、それぞれの比例定数kG,
kK と、それぞれの金型の構造値MG ,MK と、実使用
金型Xの構造値MX とから、構造値差による補正値ΔM
を求め、式(14) 実使用金型X:F=kXP=(kG +ΔT+ΔS+ΔY
+ΔM)P …(14)(ここで、kXは実使用金型X
の厚み差と面積差とヤング率差と構造差とを補正後の増
締量Pと型締力Fとの関係式における比例定数であ
る。) により、実使用金型Xに付与したい任意の型締力Fに対
応する増締量Pを直ちに求めることができる。Similarly, if the difference in the structural values between the used standard model mold and the actually used mold, such as the number of mold plates and the thickness of each plate, cannot be ignored, the standard model mold (for example, G ) And other conditions are the same, and only the structural values are different, a reference model mold K is prepared, and the clamping force F
And the tightening amount P, the proportional constants k G ,
from the k K, structure value M G of each of the mold, and M K, a structure value M X of actually used die X, the correction value ΔM by structure value differences
Equation (14) Actual mold X: F = k X P = (k G + ΔT + ΔS + ΔY
+ ΔM) P (14) (where k X is the actual mold X
Is a proportional constant in the relational expression of the tightening amount P and the mold clamping force F after correction of the thickness difference, the area difference, the Young's modulus difference, and the structural difference. ), The tightening amount P corresponding to an arbitrary mold clamping force F desired to be applied to the actually used mold X can be immediately obtained.
【0033】本発明の射出成形機の型締め方法におい
て、上記の厚み補正、面積補正、ヤング率補正、構造値
補正などは、実使用金型の厚み、接触面積、ヤング率、
または構造値などのいずれかが標準となるモデル金型の
それら項目と同等または近似する場合には、対応する補
正が不要となることはいうまでもない。例えば実使用金
型の厚みが標準モデル金型と同等であって、接触面積の
みが異なる場合は、式(3)における厚み補正値ΔTは
ゼロとなるので、面積補正のみを行えばよい。従って厚
み補正を不要とする補正方法も本発明に含まれるもので
ある。In the mold clamping method for the injection molding machine of the present invention, the thickness correction, the area correction, the Young's modulus correction, the structural value correction, etc. are performed by the thickness of the actually used mold, the contact area, the Young's modulus,
Needless to say, if any of the structural values or the like is equal to or close to those items of the standard model mold, the corresponding correction is unnecessary. For example, when the thickness of the actually used die is the same as that of the standard model die and only the contact area is different, the thickness correction value ΔT in the equation (3) becomes zero, so only the area correction needs to be performed. Therefore, a correction method that does not require the thickness correction is also included in the present invention.
【0034】[0034]
【発明の効果】本発明の射出成形機の型締め方法は、射
出成形機に装着した実使用金型に所定の型締力を付与す
るに要する増締量を決定するに際して、標準となるモデ
ル金型について増締量と型締力との関係を実測により求
め、この実測値に、上記モデル金型と実使用金型との厚
みの差に基づく補正とともに剛性値差に基づく補正を加
えるものであるので、実使用金型の剛性値が標準モデル
金型の剛性値と異なる場合も、所定の型締力を付与する
に要する増締量が正確かつ容易に得られる。The mold clamping method for an injection molding machine of the present invention is a standard model for determining the amount of tightening required to apply a predetermined mold clamping force to an actually used mold mounted on the injection molding machine. The relationship between the tightening amount and the mold clamping force of the mold is determined by actual measurement, and the measured value is corrected based on the difference in the thickness between the model mold and the actual mold and the difference based on the rigidity value. Therefore, even if the rigidity value of the actually used mold is different from the rigidity value of the standard model mold, the tightening amount required to apply the predetermined mold clamping force can be accurately and easily obtained.
【図1】 金型の増締量Pと型締力Fとの関係を示すグ
ラフ。FIG. 1 is a graph showing a relationship between a mold tightening amount P and a mold clamping force F.
【図2】 射出成形機の一例の構成を示す側面図。FIG. 2 is a side view showing the configuration of an example of an injection molding machine.
X…実使用金型 G…標準モデル金型 H…参照モデル金型 I…参照モデル金型 ΔT…厚み補正値 ΔS…面積補正値 X ... Actual use mold G ... Standard model mold H ... Reference model mold I ... Reference model mold ΔT ... Thickness correction value ΔS ... Area correction value
Claims (3)
の型締力を付与するに要する増締量を決定するに際し
て、標準となるモデル金型について増締量と型締力との
関係を実測により求め、この実測値に、上記モデル金型
と実使用金型との剛性値の差に基づく補正を加えること
を特徴とする射出成形機の型締め方法。1. When determining the tightening amount required to apply a predetermined mold clamping force to an actually used mold mounted on an injection molding machine, the tightening amount and the mold clamping force of a standard model mold are determined. A mold clamping method for an injection molding machine, characterized in that a relationship is found by actual measurement, and the measured value is corrected based on a difference in rigidity value between the model mold and the actually used mold.
の、射出成形機の金型を挟む型盤に対する接触面積の
差、ヤング率の差または構造に由来する剛性値の差のい
ずれか1以上を含むものであることを特徴とする請求項
1に記載の射出成形機の型締め方法。2. The difference in rigidity value is the difference in the contact area between the model mold and the actually used mold with respect to the mold plate sandwiching the mold of the injection molding machine, the difference in Young's modulus, or the difference in rigidity value derived from the structure. The mold clamping method for an injection molding machine according to claim 1, wherein the mold clamping method includes any one or more of the above.
あって厚みに差がない少なくとも2個のモデル金型のそ
れぞれについて増締量に対する型締力の比例定数を実測
により求め、これらの比例定数の差と、上記モデル金型
と実使用金型との剛性値差とから算出された補正値によ
りなされたものであることを特徴とする請求項1に記載
の射出成形機の型締め方法。3. The correction based on the difference in rigidity value is obtained by actually measuring a proportional constant of the mold clamping force with respect to the tightening amount for each of at least two model molds having different rigidity values and no difference in thickness. The injection molding machine according to claim 1, characterized in that it is made by a correction value calculated from a difference between these proportional constants and a rigidity value difference between the model mold and the actually used mold. Mold clamping method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP01604996A JP3159028B2 (en) | 1996-01-31 | 1996-01-31 | Mold clamping method of injection molding machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP01604996A JP3159028B2 (en) | 1996-01-31 | 1996-01-31 | Mold clamping method of injection molding machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09207184A true JPH09207184A (en) | 1997-08-12 |
JP3159028B2 JP3159028B2 (en) | 2001-04-23 |
Family
ID=11905731
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Application Number | Title | Priority Date | Filing Date |
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JP01604996A Expired - Fee Related JP3159028B2 (en) | 1996-01-31 | 1996-01-31 | Mold clamping method of injection molding machine |
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JP (1) | JP3159028B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006098321A1 (en) * | 2005-03-16 | 2006-09-21 | Sumitomo Heavy Industries, Ltd. | Molding condition setting method and method of controlling injection molding machine |
JP2007261059A (en) * | 2006-03-28 | 2007-10-11 | Sumitomo Heavy Ind Ltd | Controlling method of mold clamping force |
-
1996
- 1996-01-31 JP JP01604996A patent/JP3159028B2/en not_active Expired - Fee Related
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006098321A1 (en) * | 2005-03-16 | 2006-09-21 | Sumitomo Heavy Industries, Ltd. | Molding condition setting method and method of controlling injection molding machine |
JPWO2006098321A1 (en) * | 2005-03-16 | 2008-08-21 | 住友重機械工業株式会社 | Molding condition setting method and injection molding machine control method |
JP2010274661A (en) * | 2005-03-16 | 2010-12-09 | Sumitomo Heavy Ind Ltd | Method of controlling injection molding machine |
JP4668261B2 (en) * | 2005-03-16 | 2011-04-13 | 住友重機械工業株式会社 | Molding condition setting method and injection molding machine control method |
JP2011073454A (en) * | 2005-03-16 | 2011-04-14 | Sumitomo Heavy Ind Ltd | Molding condition setting method |
JP2007261059A (en) * | 2006-03-28 | 2007-10-11 | Sumitomo Heavy Ind Ltd | Controlling method of mold clamping force |
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