JPH0716897A - Injection molding machine - Google Patents
Injection molding machineInfo
- Publication number
- JPH0716897A JPH0716897A JP15983393A JP15983393A JPH0716897A JP H0716897 A JPH0716897 A JP H0716897A JP 15983393 A JP15983393 A JP 15983393A JP 15983393 A JP15983393 A JP 15983393A JP H0716897 A JPH0716897 A JP H0716897A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- cavity
- mold clamping
- pressure
- plate
- 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.)
- Withdrawn
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は溶融した樹脂を金型内の
キャビティに加圧注入せしめて所要形状の樹脂成形品を
形成する射出成形機の構成に係り、特にエアベントを設
けたり樹脂注入圧力を変えることなくキャビティの隅々
まで確実に樹脂を充填せしめて成形不良品を削減し生産
性の向上を図った射出成形機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an injection molding machine for forming a resin molded product having a required shape by injecting a molten resin under pressure into a cavity in a mold, and in particular, providing an air vent or resin injection pressure. The present invention relates to an injection molding machine in which resin is reliably filled in every corner of a cavity without changing the number of defective moldings to reduce defective products and improve productivity.
【０００２】通常かかる射出成形機における型締機構で
は、成形サイクルを縮めるために金型の速やかな開閉が
要求されると共に射出時の樹脂圧力に対抗して金型を閉
じておくための充分な型締力が要求されるので、一般に
油圧シリンダとラムによる油圧方式を駆動源とし種々の
増圧機構や高速化機構が考案されている。In the mold clamping mechanism of such an injection molding machine, it is usually necessary to quickly open and close the mold in order to shorten the molding cycle, and it is sufficient to keep the mold closed against the resin pressure at the time of injection. Since mold clamping force is required, various pressure increasing mechanisms and speed-up mechanisms have been generally devised by using a hydraulic system of a hydraulic cylinder and a ram as a drive source.
【０００３】[0003]
【従来の技術】中心軸を通る面で断面視した図４は従来
の射出成形機の本発明に係わる主要部を説明する原理図
であり、(4-1) は成形前の型開離状態を, (4-2) は雄型
・雌型を閉じたときの状態をまた (4-3)は更に型締力を
付与させたときの状態をそれぞれ示したものである。2. Description of the Related Art FIG. 4, which is a cross-sectional view taken along a plane passing through a central axis, is a principle view for explaining a main part of a conventional injection molding machine according to the present invention, and (4-1) is a mold release state before molding. (4-2) shows the state when the male and female molds are closed, and (4-3) shows the state when the mold clamping force is further applied.
【０００４】なお図ではキャビティを形成する雄型・雌
型を開閉せしめる機構と型締力を付与する機構とを含む
二重ラム式型締装置を具えた射出成形機の場合を例とし
て説明する。In the drawings, the case of an injection molding machine having a double ram type mold clamping device including a mechanism for opening and closing a male mold and a female mold forming a cavity and a mechanism for applying a mold clamping force will be described as an example. .
【０００５】また図５は成形不良の発生要因を説明する
図、図６は図５の不良発生を抑制する手段の一例を示す
図、図７は他の不良発生抑制手段を説明する図である。
被成形体形状が例えば情報入出力用キーボードの丸型キ
ートップの如き鍋状体である場合を例とする図４の(4-
1) で、射出成形機の主要部１は樹脂注入ノズル10に繋
がる固定された型置板11と、それに一体化して立てた複
数のタイバー13の他端側に固定された型締部16、および
上記タイバー13をガイドとして上記型置板12と該型締部
16との間を往復動し得る型駆動板14とで構成されてい
る。FIG. 5 is a diagram for explaining a cause of defective molding, FIG. 6 is a diagram showing an example of means for suppressing defective occurrence in FIG. 5, and FIG. 7 is a diagram for explaining other defective occurrence suppressing means. .
For example, the shape of the molded body is a pan-like body such as a round key top of an information input / output keyboard ((4-) in FIG.
1), the main part 1 of the injection molding machine is a fixed mold plate 11 connected to the resin injection nozzle 10, and a mold clamping part 16 fixed to the other end side of a plurality of tie bars 13 which are integrally formed with it. And the mold placing plate 12 and the mold clamping portion using the tie bar 13 as a guide.
16 and a mold drive plate 14 which can reciprocate between 16 and.
【０００６】そして上記型置板11と型締板14それぞれの
対向面11a,14a には、上記樹脂注入ノズル10に繋がって
被成形体の外形を成形する雌型12と該被成形体の内形を
成形する雄型15とが位置決めされた状態で装着されてお
り、該各型15,16 を閉じたときに該被成形体用のキャビ
ティが形成されるようになっている。On the facing surfaces 11a and 14a of the mold placing plate 11 and the mold clamping plate 14, respectively, a female mold 12 connected to the resin injection nozzle 10 for molding the outer shape of the molded body and the inside of the molded body are formed. A male mold 15 for molding a shape is mounted in a positioned state, and a cavity for the molded body is formed when the respective molds 15, 16 are closed.
【０００７】また上記型締部16は、その固定された位置
から軸方向に往復動する型締シリンダ17と該型締シリン
ダ17に対して更に軸方向に往復動し得るようにその内側
に装着されたストロークシリンダ18および上記型締シリ
ンダ17の型置板側端面に該ストロークシリンダ18をその
外周でロックし得るように装着されたチャック19を少な
くとも具えて構成されているものであり、ストロークシ
リンダ18の型置板側の端面18a は上述した型駆動板14の
裏面14b に固定されている。The mold clamping portion 16 is mounted inside the mold clamping cylinder 17 that reciprocates in the axial direction from its fixed position, and the cylinder clamping cylinder 17 so that it can further reciprocate in the axial direction with respect to the mold clamping cylinder 17. The stroke cylinder 18 and the chuck 19 mounted on the end surface of the mold clamping cylinder 17 on the mold plate side so as to lock the stroke cylinder 18 at the outer periphery thereof. An end surface 18a of the mold mounting plate side of 18 is fixed to the back surface 14b of the mold driving plate 14 described above.
【０００８】このことは型駆動板14は、図示されない機
構部と係合して軸方向に往復動する型締シリンダ17と共
に移動し得ると共に該型締シリンダ17に対して更に往復
動するストロークシリンダ18にも伴って移動し得ること
を意味する。This means that the mold drive plate 14 can move with the mold clamping cylinder 17 that reciprocates in the axial direction by engaging with a mechanism portion (not shown), and the stroke cylinder that further reciprocates with respect to the mold clamping cylinder 17. It means that you can move with 18.
【０００９】そこで型締シリンダ17を動作させない状態
で、先ず図示されない機構部でストロークシリンダ18ひ
いては型駆動板14を雌型12の方向（図では右方向）に移
動させて該雌型12と雄型15とを当接せしめて閉じた後上
記チャック19を動作させてストロークシリンダ18をその
外周でロックすると、該各型間に所要のキャビティＡが
形成された(4-2) の状態にすることができる。Therefore, in a state in which the mold clamping cylinder 17 is not operated, first, the stroke cylinder 18 and then the mold drive plate 14 are moved in the direction of the female mold 12 (rightward in the drawing) by a mechanism not shown to move the female mold 12 and the male mold 12 together. After the mold 15 is brought into contact with the mold and closed, the chuck 19 is operated to lock the stroke cylinder 18 at its outer periphery, whereby the required cavity A is formed between the molds to obtain the state (4-2). be able to.
【００１０】なおこの時点では、ストロークシリンダ18
と上述した型締シリンダ17とはチャック19を介して一体
化されているので、図示されない機構部で該型締シリン
ダ17を雌型12の方向（図では右方向）に移動させると、
該型締シリンダ17と共にストロークシリンダ18ひいては
型駆動板14が雌型12の方向（図では右方向）への押圧力
を受けることになって両金型12,15 間に型締力を付与さ
せることができる。At this point, the stroke cylinder 18
Since the mold clamping cylinder 17 and the above-described mold clamping cylinder 17 are integrated via the chuck 19, when the mold clamping cylinder 17 is moved in the direction of the female mold 12 (rightward in the drawing) by a mechanism unit (not shown),
The stroke cylinder 18 and the die drive plate 14 together with the die clamping cylinder 17 receive a pressing force in the direction of the female die 12 (rightward in the figure) to apply a die clamping force between the two dies 12, 15. be able to.
【００１１】(4-3) はこのときの状態を示したものであ
る。そして、この時点で上述した樹脂注入ノズル10から
溶融した樹脂を加圧注入することで被成形体が形成され
るので、以後上記型締シリンダ17とストロークシリンダ
18を逆方向に移動させて(4-1) に示す初期状態に戻し所
要の被成形体を得ることができる。(4-3) shows the state at this time. Then, at this time, the molded object is formed by pressurizing and injecting the molten resin from the resin injecting nozzle 10 described above.
18 can be moved in the opposite direction to return to the initial state shown in (4-1), and the desired molded body can be obtained.
【００１２】かかる射出成形機では、型締力の付与機構
と金型の開閉機構とが別であるため金型開閉用のストロ
ークシリンダ18の動作速度を上げることで成形サイクル
が縮められると共に充分な型締力が付与できるので、単
一の駆動源で動作する射出成形機よりも効率と質的に良
い成形作業が行なえるメリットがある。In such an injection molding machine, since the mechanism for applying the mold clamping force and the opening / closing mechanism for the mold are different from each other, increasing the operating speed of the stroke cylinder 18 for opening / closing the mold shortens the molding cycle and is sufficient. Since the mold clamping force can be applied, there is a merit that the molding work can be performed with better efficiency and quality than the injection molding machine which operates with a single drive source.
【００１３】[0013]
【発明が解決しようとする課題】しかしキャビティに射
出される樹脂が該キャビティの隅々まで充填されないこ
とによる成形不良が発生することがある。However, the resin injected into the cavity may not be filled in every corner of the cavity, resulting in defective molding.
【００１４】例えば図４のキャビティ部分を抽出して拡
大した図５で、(1) は樹脂射出の初期状態を, また(2)
はその終了間近の状態を, また(3) は終了後の状態をそ
れぞれ示したものである。For example, in FIG. 5 in which the cavity portion of FIG. 4 is extracted and enlarged, (1) shows the initial state of resin injection, and (2)
Shows the state near the end, and (3) shows the state after the end.
【００１５】すなわち、12,15 を図４で説明した雌型，
雄型としまた12a を前述した樹脂注入ノズル10に繋がる
ランナとした(1) で、該ランナ12a から射出する樹脂は
そのままキャビティに沿って流れ徐々に充填するが、
(2) に示すように残余空間域Ｂが小さくなるにつれて該
域内の圧力が高くなると共にその温度が高くなり、該空
間域Ｂがキャビティ内に閉じ込められることから結果的
に(3) のＣで示すような充填不足や表面の凹みすなわち
引けまたは温度上昇に伴う変色等の成形不良を発生させ
ることとなる。That is, 12 and 15 are the female molds described in FIG.
With the male type and the runner 12a connected to the resin injection nozzle 10 described above (1), the resin injected from the runner 12a flows along the cavity as it is and is gradually filled.
As shown in (2), as the residual space area B becomes smaller, the pressure in that area becomes higher and its temperature becomes higher, and the space area B is confined in the cavity. As shown, molding defects such as insufficient filling, dents on the surface, that is, shrinkage or discoloration due to temperature rise will occur.
【００１６】かかる成形不良を抑制するための一手段を
示した図６で、雌型12′は図４で説明した雌型12の雄型
15との当接面12a にキャビティに繋がるエアベント12b
を追加して形成したものである。In FIG. 6 showing one means for suppressing such defective molding, a female die 12 'is a male die of the female die 12 described in FIG.
Air vent 12b connected to the cavity on the contact surface 12a with 15
Is formed by adding.
【００１７】かかる雌型12′を図４の雄型15と組み合わ
せて所要のキャビティを形成すると、図に示す如く射出
した樹脂でキャビティ内に閉じ込められた残留エアが該
エアベント12b の領域に集められるので、被成形品用の
キャビティ域には該樹脂が充填されることになって上述
した充填不足や引けまたは温度上昇に伴う変色等のない
被成形品を形成することができる。When the female mold 12 'is combined with the male mold 15 shown in FIG. 4 to form a required cavity, residual air trapped in the cavity by the injected resin is collected in the area of the air vent 12b. Therefore, the resin is filled in the cavity region for the molded product, so that the molded product without the above-mentioned insufficient filling, shrinkage, or discoloration due to temperature rise can be formed.
【００１８】また他の成形不良抑制手段を示す図７は、
キャビティの内圧を段階的に低下させることで上述した
残余空間域Ｂの圧力低下を図ることに着目して実施され
ているものであり、の型締力，の樹脂射出圧力，
のキャビティ内圧をいずれも横軸Ｘを成形時間ｔとし縦
軸Ｙを圧力ｐとして表わしたものである。FIG. 7 showing another molding failure suppressing means is shown in FIG.
This is carried out paying attention to reducing the pressure in the residual space B described above by gradually decreasing the internal pressure of the cavity.
In each of the cavity internal pressures, the horizontal axis X is the molding time t and the vertical axis Y is the pressure p.
【００１９】すなわち、の型締力は１成形サイクルt1
〜t2の間中一定としたままの樹脂射出圧力を従来の一
点鎖線′で示す一定値から図示の如く段階的に低下す
るように変えると、キャビティ内圧をで示す如くほぼ
該樹脂射出圧力に比例して段階的に低下させられるの
で、上述した残余空間域Ｂの圧力を下げることができて
成形不良の発生を減少することができる。That is, the mold clamping force of is 1 molding cycle t 1
When the resin injection pressure that is kept constant for a period of time from ~ t 2 is changed so as to gradually decrease from the constant value shown by the conventional one-dot chain line 'as shown in the figure, the cavity internal pressure becomes approximately the resin injection pressure as shown by. Since the pressure is proportionally and stepwise reduced, the pressure in the above-described residual space region B can be reduced, and the occurrence of defective molding can be reduced.
【００２０】しかし、前者（図６）の場合にはエアベン
トの設置位置や大きさの設定に特別な技術が必要である
と共に成形品の該エアベント域に突出したバリを除去す
る工程を追加しなければならず生産性の向上を期待する
ことができないと言う問題があり、また後者（図７）の
場合には樹脂射出圧力が速度, 時間, 温度等成形条件に
直接関与するためにその設定に経験等特別な熟練した技
術が必要となり決定的な対策にはなり得ないと言う問題
があった。However, in the case of the former (FIG. 6), a special technique is required for setting the installation position and size of the air vent, and a step for removing burrs protruding in the air vent region of the molded product must be added. However, there is a problem that productivity cannot be expected to improve, and in the latter case (Fig. 7), the resin injection pressure is directly related to molding conditions such as speed, time, temperature, etc. There is a problem that special skill such as experience is required and it cannot be a decisive countermeasure.
【００２１】[0021]
【課題を解決するための手段】上記課題は、片面で樹脂
注入ノズルに繋がり他面に被成形品用キャビティの一部
を形成する雌型または雄型が装着された固定した型置板
と、該型置板の上記他面と平行して対向する面の該雌型
または雄型と対応する位置に上記被成形品用キャビティ
の残部を形成する雄型または雌型が装着されたまま上記
雌型または雄型と当接して上記被成形品用キャビティが
形成し得るように該型置板に対して往復動する型駆動板
とを少なくとも具えた射出成形機であって、型置板が、
前記他面の金型装着域を除く型駆動板と対面する領域内
の複数箇所に、対応する雌型と雄型を当接せしめたとき
の該型駆動板を型開離方向に加圧し得る圧力調整自在な
型締力調整シリンダを具えて構成されている射出成形機
によって解決される。SUMMARY OF THE INVENTION The above object is to provide a fixed mold plate to which a female mold or a male mold is attached, which is connected to a resin injection nozzle on one side and forms a part of a cavity for a molded product on the other side, The female mold with the male mold or the female mold forming the remainder of the cavity for the molded product at a position corresponding to the female mold or the male mold on a surface facing in parallel with the other surface of the mold plate is attached to the female mold. An injection molding machine comprising at least a mold driving plate that reciprocates with respect to the mold placing plate so that the mold cavity may be formed by contacting the mold or the male mold.
The die drive plate when the corresponding female die and male die are brought into contact with each other at a plurality of positions in the area facing the die drive plate except the die mounting area on the other surface can be pressed in the die opening direction. This is solved by an injection molding machine configured with a mold clamping force adjusting cylinder whose pressure is adjustable.
【００２２】[0022]
【作用】キャビティが樹脂で充填されるまでは該キャビ
ティ内のエアが排出され且つほぼ充填が終了した時点で
所定の型締力が付与されるように射出成形機を構成する
と、キャビティ内の残留エアによる充填不足や引けまた
は温度上昇に伴う変色等の成形不良を抑制することがで
きる。When the injection molding machine is constructed so that the air in the cavity is discharged until the cavity is filled with the resin and a predetermined mold clamping force is applied at the time when the cavity is almost completely filled, the cavity remains. Molding defects such as insufficient filling with air, shrinkage, or discoloration due to temperature rise can be suppressed.
【００２３】そこで本発明では、固定された型置板と移
動する型駆動板との間に型締力調整シリンダを配設し、
型締力が所定値より小さい値と所定値との二段階に変え
られるように射出成形機を構成している。Therefore, in the present invention, a mold clamping force adjusting cylinder is provided between the fixed mold placing plate and the moving mold driving plate,
The injection molding machine is configured so that the mold clamping force can be changed in two steps of a value smaller than a predetermined value and a predetermined value.
【００２４】このことは、キャビティが樹脂で充填され
るまでは型締力を所定値より小さくすることで該キャビ
ティ内の残留エアの排出の容易化を図ると共に、キャビ
ティが樹脂で充填される時点で該型締力を所定値にする
ことで型間に生ずるバリがなくせることを示している。This means that the mold clamping force is made smaller than a predetermined value until the cavity is filled with the resin, so that the residual air in the cavity is easily discharged, and at the time when the cavity is filled with the resin. Shows that by setting the mold clamping force to a predetermined value, burrs generated between the molds can be eliminated.
【００２５】従って、上述したような成形不良品の発生
を抑制することができて従来より生産性のよい射出成形
機を構成することができる。Therefore, it is possible to suppress the occurrence of defective molding as described above and to construct an injection molding machine having higher productivity than before.
【００２６】[0026]
【実施例】図１は本発明になる射出成形機の構成例を説
明する図であり、図２は型締力調整シリンダの効果を不
良抑制手段と共に説明する図、図３は型締力調整シリン
ダの配設位置をブロック的に表示した図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining a configuration example of an injection molding machine according to the present invention, FIG. 2 is a diagram for explaining the effect of a mold clamping force adjusting cylinder together with defect suppressing means, and FIG. 3 is a mold clamping force adjusting. It is the figure which displayed the arrangement position of the cylinder like a block.
【００２７】なお図では理解し易くするため、いずれも
図４で説明した射出成形機に適用させる場合を例として
いるので、図４と同じ対象部材・部位には同一の記号を
付していると共に重複する説明についてはそれを省略す
る。For the sake of easy understanding in the drawing, the case where each of them is applied to the injection molding machine described in FIG. 4 is taken as an example, and therefore, the same target members and parts as those in FIG. 4 are denoted by the same symbols. A duplicate description will be omitted.
【００２８】外観を斜視図で表わした図１で本発明にな
る射出成形機の主要部２は、図４で説明した射出成形機
主要部１の固定された型置板11に、例えば圧力調整弁に
よって任意に圧力が設定できる型締力調整シリンダ21を
雄型側に向かって往復動するように配設して構成したも
のであり、該型締力調整シリンダ21の往復動する端面21
a は型駆動板14の型置板との対抗面14a と当接するよう
な位置の複数箇所（図では雌型12を挟む対象位置２箇
所）に配設されている。The main part 2 of the injection molding machine according to the present invention shown in FIG. 1, which is a perspective view of the external appearance, is mounted on the fixed mounting plate 11 of the main part 1 of the injection molding machine described in FIG. A mold clamping force adjusting cylinder 21 whose pressure can be arbitrarily set by a valve is arranged so as to reciprocate toward a male mold side, and the reciprocating end face 21 of the mold clamping force adjusting cylinder 21 is arranged.
a is arranged at a plurality of positions (two target positions sandwiching the female mold 12 in the figure) such that a is brought into contact with the surface 14a of the mold driving plate 14 which faces the mold mounting plate.
【００２９】そして図示されない制御部からの信号で動
作するこの場合の該型締力調整シリンダ21の型駆動板14
に対する押圧力とその端面21a の位置は、図４で説明し
た型締シリンダ17による型締力が付与されている状態の
元で、キャビティへの樹脂射出に伴って発生する該キャ
ビティ内残余空間域Ｂでのエア圧力が所定値まで上昇し
たとき，例えばキャビティが樹脂で満たされる直前, に
のみ該型駆動板14が型締力に抗して僅かに後退し得るよ
うに設定されている。Then, the mold driving plate 14 of the mold clamping force adjusting cylinder 21 in this case, which operates by a signal from a control unit (not shown)
The pressing force against and the position of the end face 21a are the residual space in the cavity generated by the resin injection into the cavity under the condition that the mold clamping force by the mold clamping cylinder 17 described in FIG. 4 is applied. It is set so that the mold drive plate 14 can be slightly retracted against the mold clamping force only when the air pressure at B rises to a predetermined value, for example, just before the cavity is filled with resin.
【００３０】このことは換言すれば、該型締力調整シリ
ンダ21の押圧力をF1，上記型締シリンダ17による型締力
をF2, キャビティ内のエア圧力の所定値をP1としたとき
に、“F2＞F1＞F2−P1”が成立するように該型締力調整
シリンダ21の押圧力F1を設定することを意味する。In other words, the pressing force of the mold clamping force adjusting cylinder 21 is F 1 , the mold clamping force by the mold clamping cylinder 17 is F 2 , and the predetermined value of the air pressure in the cavity is P 1 . when the, "F 2> F 1> F 2 -P 1" means to set the pressing force F 1 of the mold clamping force adjusting cylinder 21 to stand.
【００３１】なおこの場合のキャビティ内エア圧力の所
定値P1は、例えばキャビティのエアベント形成域に圧力
センサを配置した状態で試験的に樹脂を射出させ、その
ときの時間的な圧力変化を予め検知しておくことで容易
に設定することができる。The predetermined value P 1 of the air pressure in the cavity in this case is determined by, for example, injecting resin on a trial basis with a pressure sensor arranged in the air vent forming region of the cavity, and measuring the temporal pressure change at that time. It can be easily set by detecting it.
【００３２】従って、キャビティが樹脂で満たされる前
に雌型12と雄型15の間が僅かに開離して該キャビティ内
に閉じ込められたエアが排出されると共に、該キャビテ
ィ内のエア圧力がなくなった時点で上記型締力によって
金型間が閉じるので、上述したエアベントを設けたり樹
脂射出圧力を変えたりすることなくキャビティの隅々ま
で樹脂が充填させられると共にバリ等の発生を抑制する
ことができる。Therefore, before the cavity is filled with the resin, the space between the female mold 12 and the male mold 15 is slightly separated to discharge the air trapped in the cavity, and the air pressure in the cavity disappears. At that time, the molds are closed by the mold clamping force, so that it is possible to fill the resin in every corner of the cavity and suppress the occurrence of burrs etc. without providing the above-mentioned air vent or changing the resin injection pressure. it can.
【００３３】かかる型締力調整シリンダ21を具えた射出
成形機では、型締力の付与機構と金型の開閉機構とが別
であるため上述した従来の射出成形機と同様に成形サイ
クルの短縮化と充分な型締力付与とが実現できると共に
成形時にキャビティ内に閉じ込められるエアが排出され
るので、充填不足や引けまたは温度上昇に伴う変色等の
ない成形品を形成することができて生産性の向上を期待
することができる。In an injection molding machine equipped with such a mold clamping force adjusting cylinder 21, the mold clamping force applying mechanism and the mold opening / closing mechanism are different, so that the molding cycle is shortened as in the conventional injection molding machine described above. Can be realized and sufficient mold clamping force can be realized, and the air trapped in the cavity during molding is discharged, so it is possible to form molded products without discoloration due to insufficient filling, shrinkage or temperature rise. It can be expected to improve the sex.
【００３４】図７同様に横軸Ｘを成形時間ｔとし縦軸Ｙ
を圧力ｐとしてグラフ化した図２で、は本発明に係わ
る型締力調整シリンダの作用を含めた型締力の変化状態
を示したものであり、の樹脂射出圧力とのキャビテ
ィ内圧はいずれも図７で説明したものである。As in FIG. 7, the horizontal axis X is the molding time t and the vertical axis Y is
2 is a graph showing pressure as p, and FIG. 2 shows a change state of the mold clamping force including the action of the mold clamping force adjusting cylinder according to the present invention, and both the resin injection pressure and the cavity internal pressure are This has been described with reference to FIG.
【００３５】すなわちで示す型締力は、１成形サイク
ルt1〜t2間の内の少なく共におけるキャビティ内圧の
上述した所定値P1を超える領域では図１で説明した型締
力調整シリンダ21の作用によってその型締力が該キャビ
ティ内圧P1によって金型間が僅かに開離し得る型締力
ｐ′になるように設定されている。That is, in the region where the mold clamping force indicated by is more than the above-mentioned predetermined value P 1 of the cavity internal pressure at least in one molding cycle t 1 to t 2, the mold clamping force adjusting cylinder 21 explained in FIG. By the action of, the mold clamping force is set to be a mold clamping force p'which allows the dies to be slightly separated by the cavity internal pressure P 1 .
【００３６】従って、成形開始と同時にキャビティ端部
に閉じ込められるエアは型締力ｐ′の時間t3内に金型間
の開離隙間から排出されるので、以後図７で説明したよ
うに樹脂射出圧力を段階的に低下させることでキャビテ
ィの隅々まで確実に樹脂を充填せしめることができる。Therefore, since the air trapped in the cavity end portion at the same time as the start of molding is discharged from the opening gap between the molds within the time t 3 of the mold clamping force p ', the resin as described later with reference to FIG. By gradually reducing the injection pressure, it is possible to reliably fill the resin in every corner of the cavity.
【００３７】また、型締力ｐ′の時間t3を経過した後は
初期の型締力ｐ″で金型間が閉じているのでバリの発生
も抑制することができる。なお、上記型締力ｐ′が初期
型締力ｐ″の50％程度になるように型締力調整シリンダ
の圧力を圧力調整弁で調整した状態で成形開始からキャ
ビティ内圧が最高になるまでの時間t4が 0.3秒程度の被
成形品を成形する場合では、上述した型締力ｐ′の時間
t3を数μ秒程度に設定することで良好な成形品が得られ
ることを実験的に確認している。After the time t 3 of the mold clamping force p ′ has passed, the molds are closed by the initial mold clamping force p ″, so that the occurrence of burrs can be suppressed. time t 4 from the force p 'is molded started in a state adjusted by the pressure regulating valve the pressure of the mold clamping force adjusting cylinder so that about 50% of the initial clamping force p "until the cavity pressure is highest 0.3 In the case of molding a molded product for about 2 seconds, the time of the mold clamping force p'mentioned above
It has been experimentally confirmed that a good molded product can be obtained by setting t 3 to about several microseconds.
【００３８】型締力調整シリンダの配設位置をブロック
的に示した図３で、該型締力調整シリンダ21は射出成形
機30を制御する制御部31からの樹脂射出信号にタイマ32
を介して繋がる油圧バルブ33によって制御されるが、こ
の場合の該油圧バルブ33は射出成形機の作動ポンプ34に
繋がる圧力調整弁35によってその圧力が自在に調整し得
るようになっている。In FIG. 3 in which the positions of the mold clamping force adjusting cylinders are shown in a block diagram, the mold clamping force adjusting cylinder 21 receives a resin injection signal from a control unit 31 which controls the injection molding machine 30, and a timer 32.
The pressure of the hydraulic valve 33 in this case can be freely adjusted by the pressure adjusting valve 35 connected to the working pump 34 of the injection molding machine.
【００３９】そこで、被成形品の形状や大きさによって
異なるキャビティ内圧最高値を図１で説明した手段で予
め検知し、その値から設定する上記内圧所定値p1に合う
ように射出成形機としての型締力ｐ″をベースとして上
記圧力調整弁35を調整することで、所要の型締力ｐ′を
実現することができる。Therefore, the maximum value of the cavity internal pressure, which varies depending on the shape and size of the molded product, is detected in advance by the means described in FIG. 1, and the injection molding machine is used so as to meet the above-mentioned internal pressure predetermined value p 1 set from the value. The required mold clamping force p ′ can be realized by adjusting the pressure adjusting valve 35 based on the mold clamping force p ″.
【００４０】従って上記タイマ32を成形機の射出信号と
マッチングさせてセットすることで、上記型締力調整シ
リンダ21を図２で説明したように作動させることができ
るので生産性のよい射出成形機を構成することができ
る。Therefore, by setting the timer 32 so as to match the injection signal of the molding machine, the mold clamping force adjusting cylinder 21 can be operated as described with reference to FIG. Can be configured.
【００４１】[0041]
【発明の効果】上述の如く本発明により、エアベントを
設けたり樹脂注入圧力を変えることなくキャビティの隅
々まで確実に樹脂を充填せしめて成形不良品を削減し生
産性の向上を図った射出成形機を提供することができ
る。INDUSTRIAL APPLICABILITY As described above, according to the present invention, the injection molding is performed by surely filling the resin in every corner of the cavity without providing the air vent or changing the resin injection pressure to reduce defective products and improve the productivity. Machine can be provided.
【００４２】なお本発明の説明では樹脂注入ノズルに繋
がる金型が雌型である場合を例としているがそれを雄型
に代えても同等の効果が得られることは明らかである。In the description of the present invention, the case where the mold connected to the resin injection nozzle is the female mold is taken as an example, but it is clear that the same effect can be obtained even if the mold is replaced with the male mold.
【図１】 本発明になる射出成形機の構成例を説明する
図。FIG. 1 is a diagram illustrating a configuration example of an injection molding machine according to the present invention.
【図２】 型締力調整シリンダの効果を不良抑制手段と
共に説明する図。FIG. 2 is a diagram illustrating an effect of a mold clamping force adjusting cylinder together with a defect suppressing unit.
【図３】 型締力調整シリンダの配設位置をブロック的
に表示した図。FIG. 3 is a block diagram showing an arrangement position of a mold clamping force adjusting cylinder.
【図４】 従来の射出成形機の本発明に係わる主要部を
説明する原理図。FIG. 4 is a principle diagram illustrating a main part of a conventional injection molding machine according to the present invention.
【図５】 成形不良の発生要因を説明する図。FIG. 5 is a diagram illustrating a cause of a molding defect.
【図６】 図５の不良発生を抑制する手段の一例を示す
図。FIG. 6 is a diagram showing an example of means for suppressing the occurrence of defects in FIG.
【図７】 他の不良発生抑制手段を説明する図。FIG. 7 is a diagram illustrating another defect occurrence suppressing unit.
10 樹脂注入ノズル 11 型置板 12,15 雌型, 雄型 13 タイバー 14 型駆動板 16 型駆動部 17 型締シリンダ 18 ストロークシリンダ 19 チャック 21 型締力調整シリンダ 21a 端面 30 射出成形機 31 制御部 32 タイマ 33 油圧バルブ 34 作動ポ
ンプ 35 圧力調整弁10 Resin injection nozzle 11 Mold placement plate 12,15 Female type, Male type 13 Tie bar 14 Type drive plate 16 Type drive section 17 Mold clamping cylinder 18 Stroke cylinder 19 Chuck 21 Mold clamping force adjusting cylinder 21a End face 30 Injection molding machine 31 Control section 32 Timer 33 Hydraulic valve 34 Actuating pump 35 Pressure adjusting valve
Claims (1)
に被成形品用キャビティの一部を形成する雌型(12)また
は雄型が装着された固定した型置板(11)と、該型置板(1
1)の上記他面と平行して対向する面の該雌型(12)または
雄型と対応する位置に上記被成形品用キャビティの残部
を形成する雄型(15)または雌型が装着されたまま上記雌
型(12)または雄型と当接して上記被成形品用キャビティ
が形成し得るように該型置板(11)に対して往復動する型
駆動板(14)とを少なくとも具えた射出成形機であって、 型置板(11)が、前記他面の金型装着域を除く型駆動板(1
4)と対面する領域内の複数箇所に、対応する雌型(12)と
雄型(15)を当接せしめたときの該型駆動板(14)を型開離
方向に加圧し得る圧力調整自在な型締力調整シリンダ(2
1)を具えて構成されていることを特徴とした射出成形
機。1. A fixed mold plate (11) on which a female mold (12) or a male mold is attached, which is connected to a resin injection nozzle (10) on one side and forms a part of a cavity for a molded product on the other side. , The template plate (1
The male mold (15) or the female mold for forming the remaining part of the cavity for the molded product is mounted at a position corresponding to the female mold (12) or the male mold on the surface facing in parallel with the other surface of 1). At least a mold drive plate (14) that reciprocates with respect to the mold placing plate (11) so that the mold cavity can be formed by contacting the female mold (12) or the male mold as it is. In the injection molding machine, the mold plate (11) is a mold drive plate (1) excluding the mold mounting area on the other surface.
4) Pressure adjustment that can press the mold drive plate (14) in the mold separating direction when the corresponding female mold (12) and male mold (15) are brought into contact with each other at a plurality of positions in the area facing Flexible mold clamping force adjusting cylinder (2
An injection molding machine characterized by comprising 1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15983393A JPH0716897A (en) | 1993-06-30 | 1993-06-30 | Injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15983393A JPH0716897A (en) | 1993-06-30 | 1993-06-30 | Injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0716897A true JPH0716897A (en) | 1995-01-20 |
Family
ID=15702247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15983393A Withdrawn JPH0716897A (en) | 1993-06-30 | 1993-06-30 | Injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0716897A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012157979A (en) * | 2011-01-28 | 2012-08-23 | Canon Electronics Inc | Mold clamping device, method for controlling the same, and injection molding machine |
-
1993
- 1993-06-30 JP JP15983393A patent/JPH0716897A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012157979A (en) * | 2011-01-28 | 2012-08-23 | Canon Electronics Inc | Mold clamping device, method for controlling the same, and injection molding machine |
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| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000905 |