JP3017329B2 - Ring check valve for injection molding machine - Google Patents
Ring check valve for injection molding machineInfo
- Publication number
- JP3017329B2 JP3017329B2 JP3193014A JP19301491A JP3017329B2 JP 3017329 B2 JP3017329 B2 JP 3017329B2 JP 3193014 A JP3193014 A JP 3193014A JP 19301491 A JP19301491 A JP 19301491A JP 3017329 B2 JP3017329 B2 JP 3017329B2
- Authority
- JP
- Japan
- Prior art keywords
- check valve
- ring
- cylinder
- injection
- screw
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/52—Non-return devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/52—Non-return devices
- B29C2045/524—Flexible valves
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、インラインスクリュー
式射出成形機のスクリューの先端部に取着され射出材料
の逆流を防止するリング状逆止弁に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring check valve which is attached to the tip of a screw of an in-line screw type injection molding machine to prevent backflow of injection material.
【０００２】[0002]
【従来の技術】従来、溶融した合成樹脂などを金型に射
出して合成樹脂などの成形体を製造するスクリュー式射
出成形機が知られている。2. Description of the Related Art Conventionally, there has been known a screw-type injection molding machine for producing a molded body of a synthetic resin or the like by injecting a molten synthetic resin or the like into a mold.
【０００３】図４（ａ）及び図４（ｂ）は、スクリュー
式射出成形機の構成を示す説明的断面図である。図４
（ａ）に示すようにスクリュー式射出成形機は、シリン
ダ４１内で計量された射出材料を、シリンダ４１内を回
転しながら往復運動を行うスクリュー４２により、加
熱、混練、輸送し、シリンダ４１先端に設けられた小孔
４３から金型に射出するものである。FIGS. 4 (a) and 4 (b) are explanatory sectional views showing the configuration of a screw type injection molding machine. FIG.
As shown in (a), the screw-type injection molding machine heats, kneads, and transports the injection material measured in the cylinder 41 by a screw 42 that reciprocates while rotating in the cylinder 41, Is injected into the mold through a small hole 43 provided in the mold.
【０００４】前記スクリュー式射出成形機では、スクリ
ュー４２が前進して射出材料を前記小孔４３から金型内
に射出する際に、射出圧が所定の時間一定に保たれてい
る。このとき、前記射出圧により射出材料が逆流するこ
とを防止するために、前記スクリュー式射出成形機のス
クリュー４２の先端にリング状逆止弁４４が取着されて
いる。In the screw-type injection molding machine, when the screw 42 advances to inject the injection material into the mold through the small hole 43, the injection pressure is kept constant for a predetermined time. At this time, in order to prevent the injection material from flowing backward due to the injection pressure, a ring check valve 44 is attached to the tip of the screw 42 of the screw type injection molding machine.
【０００５】前記リング状逆止弁４４は、射出工程では
スクリュー４２との間に射出材料が流通自在の間隙４５
を有しているが、射出完了時には図４（ｂ）に示すよう
に、射出圧によりリング状逆止弁４４が後退してその後
端面４４ａがスクリュー４２の端面４２ａと接触して前
記間隙４５を閉ざして射出材料が流通できなくなるよう
に構成されている。前記リング状逆止弁４４の先端面４
４ｂ及び外周側の表面４４ｃは平滑であって、外周側の
表面４４ｃとシリンダ４１の内周壁との間隙は数１０〜
数１００μｍに調整されている。前記リング状逆止弁４
４によれば、射出材料が合成樹脂などのように高粘度物
質であるときには十分な効果が得られる。In the injection step, the ring-shaped check valve 44 has a gap 45 through which the injection material can flow between the screw and the screw 42.
When the injection is completed, as shown in FIG. 4B, the ring-shaped check valve 44 is retracted by the injection pressure, and the rear end surface 44a comes into contact with the end surface 42a of the screw 42 to close the gap 45. It is configured such that the injection material is closed and cannot be distributed. Tip surface 4 of the ring check valve 44
4b and the outer peripheral surface 44c are smooth, and the gap between the outer peripheral surface 44c and the inner peripheral wall of the cylinder 41 is several tens.
It is adjusted to several 100 μm. The ring check valve 4
According to 4, a sufficient effect can be obtained when the injection material is a high-viscosity substance such as a synthetic resin.
【０００６】ところで、特公平２−１５６２０号公報に
は、スクリュー式射出成形機を用いて金属マグネシウム
またはマグネシウム合金の一部を溶融して半凝固状態の
スラリーを製造する方法が開示されている。前記公報記
載の製造方法によれば、スクリュー式射出成形機の剪断
作用を利用して、金属マグネシウムまたはマグネシウム
合金をその液相線以下の温度で半凝固状態のスラリーと
することができ、同時に金型に射出できるので、金属マ
グネシウムまたはマグネシウム合金の鋳造成形体を有利
に製造することができるとされている。Japanese Patent Publication No. 15620/1990 discloses a method of producing a semi-solidified slurry by melting a part of magnesium metal or magnesium alloy using a screw type injection molding machine. According to the production method described in the above-mentioned publication, metal magnesium or a magnesium alloy can be converted into a semi-solidified slurry at a temperature below its liquidus line by utilizing the shearing action of a screw injection molding machine, and It is stated that since it can be injected into a mold, a cast formed body of metallic magnesium or a magnesium alloy can be advantageously produced.
【０００７】しかしながら、金属マグネシウムまたはマ
グネシウム合金の半凝固状態のスラリーは、液相と固体
粒子相とからなりその粘度は樹脂の数百分の一乃至数千
分の一と極めて低いので、前記従来のリング状逆止弁４
４では、射出圧によりリング状逆止弁４４とシリンダ４
１の内周壁との間隙から前記半凝固スラリーの主に液相
部分が逆流するとの不都合がある。前記半凝固スラリー
の液相部分が逆流により減少すると、相対的に固体粒子
相が多くなるため、同じ温度では射出できなくなった
り、得られた鋳造成形品に偏析が発生しやすくなる。However, the semi-solidified slurry of magnesium metal or magnesium alloy is composed of a liquid phase and a solid particle phase, and has a very low viscosity of several hundredths to several thousandths of resin. Ring check valve 4
4, the ring-shaped check valve 44 and the cylinder 4
There is an inconvenience that mainly the liquid phase portion of the semi-solidified slurry flows backward from the gap with the inner peripheral wall of No. 1. When the liquid phase portion of the semi-solidified slurry is reduced by the backflow, the solid particle phase relatively increases, so that injection cannot be performed at the same temperature or segregation easily occurs in the obtained cast molded product.
【０００８】前記不都合を解消するために、リング状逆
止弁４４とシリンダ４１の内周壁との間隙をさらに小さ
くすることが考えられるが、前記間隙が減少すると、シ
リンダ４１に対してリング状逆止弁４４を取着したスク
リュー４２が組み込み難くなったり、シリンダ４１内に
おいてリング状逆止弁４２がシリンダ４１の内周壁に接
触して作動性が低下したり、シリンダ４１が損傷したり
することがある。In order to solve the above-mentioned inconvenience, it is conceivable to further reduce the gap between the ring-shaped check valve 44 and the inner peripheral wall of the cylinder 41. The screw 42 to which the stop valve 44 is attached becomes difficult to install, the ring-shaped check valve 42 contacts the inner peripheral wall of the cylinder 41 in the cylinder 41, and the operability is reduced, and the cylinder 41 is damaged. There is.
【０００９】[0009]
【発明が解決しようとする課題】本発明は、かかる不都
合を解消して、装置の作動性低下や損傷をおこすことな
く、低粘度物質の射出成形時の逆流を防止することがで
きる射出成形機のリング状逆止弁を提供することを目的
とする。SUMMARY OF THE INVENTION The present invention is directed to an injection molding machine which eliminates such inconveniences and prevents backflow during injection molding of a low-viscosity substance without lowering the operability or damaging the apparatus. An object of the present invention is to provide a ring check valve.
【００１０】[0010]
【課題を解決するための手段】かかる目的を達成するた
めに、本発明の射出成形機のリング状逆止弁は、スクリ
ュー式射出成形機のシリンダ中に挿着されたスクリュー
の先端部に取着され射出材料の逆流を防止するリング状
逆止弁であって、射出方向側端面に射出時に圧入される
該射出材料により該リング状逆止弁の側面がシリンダ内
面側に向かって拡大される環状溝を設けてなることを特
徴とする。In order to achieve the above object, a ring check valve of an injection molding machine according to the present invention is mounted on a tip of a screw inserted into a cylinder of a screw type injection molding machine. A ring-shaped check valve for preventing backflow of an injection material, wherein a side surface of the ring-shaped check valve is expanded toward an inner surface of a cylinder by the injection material which is press-fitted into an end surface in an injection direction at the time of injection. It is characterized in that an annular groove is provided.
【００１１】また、本発明の射出成形機のリング状逆止
弁は、リング状逆止弁のシリンダと対面する側面に射出
時にシリンダと該側面との間に逆流して侵入する該射出
材料に乱流を起こす溝部を設けてなることを特徴とす
る。Further, the ring check valve of the injection molding machine of the present invention is characterized in that the injection material which flows backward between the cylinder and the side surface at the time of injection into the side surface of the ring check valve which faces the cylinder during injection. A turbulent groove is provided.
【００１２】さらに、本発明の射出成形機のリング状逆
止弁は、リング状逆止弁の射出方向側端面に射出時に圧
入される該射出材料により該リング状逆止弁の側面がシ
リンダ内面側に向かって拡大される環状溝を設け、シリ
ンダと対面する側面に射出時にシリンダと該側面との間
に逆流して侵入する該射出材料に乱流を起こす溝部を設
けてなることを特徴とする。Further, in the ring check valve of the injection molding machine according to the present invention, the side surface of the ring check valve is formed by the injection material press-fitted into the end face of the ring check valve in the injection direction at the time of injection. An annular groove is provided that is enlarged toward the side, and a groove that causes a turbulent flow in the injection material that flows backward between the cylinder and the side surface at the time of injection and enters the injection material is provided on a side surface facing the cylinder. I do.
【００１３】前記溝部は、前記リング状逆止弁のシリン
ダと対面する側面の全周に亘って、複数条設けられてい
ることが好ましい。It is preferable that a plurality of grooves are provided over the entire circumference of the side surface of the ring-shaped check valve facing the cylinder.
【００１４】[0014]
【作用】射出方向側端面に環状溝を設けてなる本発明の
リング状逆止弁によれば、射出時の圧力により射出材料
が前記環状溝に圧入される。すると、前記射出材料の圧
力により、前記リング状逆止弁の側面が全周に亘ってシ
リンダ内面側に向かって拡大され、リング状逆止弁とシ
リンダ壁との間隙が狭められ、前記射出材料の逆流が低
減される。前記リング状逆止弁とシリンダ壁との間隙
は、射出材料がシリンダ先端部で圧縮され圧力が高まっ
たときにだけ狭められ、それ以外のときには適正な間隔
を保っているので、装置の作動性低下や損傷が避けられ
る。According to the ring check valve of the present invention in which an annular groove is provided on the end face on the injection direction side, the injection material is pressed into the annular groove by the pressure at the time of injection. Then, due to the pressure of the injection material, the side surface of the ring-shaped check valve is enlarged toward the inner surface of the cylinder over the entire circumference, the gap between the ring-shaped check valve and the cylinder wall is reduced, and the injection material is reduced. Is reduced. The gap between the ring-shaped check valve and the cylinder wall is narrowed only when the injection material is compressed at the tip of the cylinder and the pressure is increased, and at other times the proper gap is maintained. Degradation and damage are avoided.
【００１５】また、シリンダと対面する側面に溝部を設
けてなる本発明のリング状逆止弁によれば、射出時の圧
力により逆流する射出材料がリング状逆止弁のシリンダ
と対面する側面とシリンダの内周壁との間隙を流動する
際に、前記溝部を横断すると乱流が発生する。乱流が発
生した流体では流路抵抗が大きくなるので、前記射出材
料の逆流が低減される。Further, according to the ring check valve of the present invention in which a groove is provided on the side surface facing the cylinder, the injection material that flows backward due to the pressure at the time of injection has the side surface facing the cylinder of the ring check valve. When flowing through the gap with the inner peripheral wall of the cylinder, turbulent flow occurs when crossing the groove. Since the flow path resistance increases in the fluid in which the turbulent flow occurs, the backflow of the injection material is reduced.
【００１６】[0016]
【実施例】次に、添付の図面を参照しながら本発明の射
出成形機のリング状逆止弁についてさらに詳しく説明す
る。図１は本発明のリング状逆止弁の一実施例を示す説
明的断面図、図２は他の実施例を示す説明的断面図、図
３はさらに他の実施例を示す説明的断面図、図５は図３
のＡ部の拡大正面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a ring check valve of an injection molding machine according to the present invention. FIG. 1 is an explanatory sectional view showing one embodiment of a ring-shaped check valve of the present invention, FIG. 2 is an explanatory sectional view showing another embodiment, and FIG. 3 is an explanatory sectional view showing still another embodiment. FIG. 5 shows FIG.
It is an enlarged front view of the A section of FIG.
【００１７】図１に示すように、本実施例のリング状逆
止弁１１は、仮想線で示すシリンダ１２に挿着されたス
クリュー１３の先端に取着されるものであって、射出方
向側端面１１ａには断面Ｖ字状の環状溝１４が設けられ
ており、リング状逆止弁１１のシリンダ１２と対面する
側面１１ｂには溝部１５が設けられている。溝部１５
は、側面１１ｂの全周に亘って、複数条設けられてい
る。As shown in FIG. 1, the ring check valve 11 of the present embodiment is attached to the tip of a screw 13 inserted into a cylinder 12 indicated by an imaginary line. An annular groove 14 having a V-shaped cross section is provided on the end face 11a, and a groove 15 is provided on a side face 11b of the ring-shaped check valve 11 facing the cylinder 12. Groove 15
Are provided over the entire periphery of the side surface 11b.
【００１８】本実施例のリング状逆止弁１１によれば、
スクリュー１３が前進して射出材料を射出する際に射出
圧がかかると、射出材料が断面Ｖ字状の環状溝１３に圧
入され、側面１１ｂがシリンダ１２の内周壁側に向かっ
て拡大される。この結果、側面１１ｂとシリンダ１２の
内周壁との間隙が狭められ、射出材料の逆流する量が低
減される。According to the ring check valve 11 of the present embodiment,
When the injection pressure is applied when the screw 13 advances to inject the injection material, the injection material is pressed into the annular groove 13 having a V-shaped cross section, and the side surface 11 b is enlarged toward the inner peripheral wall side of the cylinder 12. As a result, the gap between the side surface 11b and the inner peripheral wall of the cylinder 12 is narrowed, and the amount of backflow of the injection material is reduced.
【００１９】前記環状溝１３によって狭められた側面１
１ｂとシリンダ１２の内周壁との間隙を通って逆流する
射出材料は、側面１１ｂの全周に亘って複数条設けられ
ている溝部１５を横断して流動する際に前記射出材料の
流れに乱流が起き、流路抵抗が大きくなるので、射出材
料の逆流する量がさらに低減される。The side surface 1 narrowed by the annular groove 13
The injection material flowing backward through the gap between the inner material 1b and the inner peripheral wall of the cylinder 12 is disturbed by the flow of the injection material when flowing across the grooves 15 provided over the entire circumference of the side surface 11b. Since the flow occurs and the flow resistance increases, the amount of the backflow of the injection material is further reduced.
【００２０】図２は、本発明のリング状逆止弁の他の実
施例を示す説明的断面図である。図２に示すように、本
実施例のリング状逆止弁２１は、仮想線で示すシリンダ
２２に挿着されたスクリュー２３の先端に取着されるも
のであって、射出方向側端面２１ａには断面Ｖ字状の環
状溝２４が設けられている。FIG. 2 is an explanatory sectional view showing another embodiment of the ring check valve of the present invention. As shown in FIG. 2, the ring-shaped check valve 21 of the present embodiment is attached to the tip of a screw 23 inserted into a cylinder 22 indicated by a phantom line. Is provided with an annular groove 24 having a V-shaped cross section.
【００２１】本実施例のリング状逆止弁２１によれば、
スクリュー２３が前進して射出材料を射出する際に射出
圧がかかると、射出材料が断面Ｖ字状の環状溝２４に圧
入され、側面２１ｂがシリンダ２２の内周壁側に向かっ
て拡大される。この結果、側面２１ｂとシリンダ２２の
内周壁との間隙が狭められ、射出材料の逆流する量が低
減される。According to the ring check valve 21 of this embodiment,
When the injection pressure is applied when the screw 23 advances to inject the injection material, the injection material is pressed into the annular groove 24 having a V-shaped cross section, and the side surface 21 b is enlarged toward the inner peripheral wall side of the cylinder 22. As a result, the gap between the side surface 21b and the inner peripheral wall of the cylinder 22 is narrowed, and the amount of backflow of the injection material is reduced.
【００２２】前記いずれかの実施例に記載されたリング
状逆止弁によれば、前記リング状逆止弁１１または２１
とシリンダ１２または２２の内周壁との間隙は、射出材
料がシリンダ先端部で圧縮され圧力が高まったときにだ
け狭められ、それ以外のときには適正な間隔を保ってい
るので、リング状逆止弁の側面１１ｂまたは２１ｂがシ
リンダ１２または２２の内周壁に接触することがない。
従って、射出成形機の作動性が低下することがなく、装
置の損傷も避けることができる。According to the ring check valve described in any one of the above embodiments, the ring check valve 11 or 21 can be used.
The gap between the cylinder and the inner peripheral wall of the cylinder 12 or 22 is narrowed only when the injection material is compressed at the tip of the cylinder and the pressure is increased, and at other times the proper distance is maintained. Side surface 11b or 21b does not contact the inner peripheral wall of the cylinder 12 or 22.
Therefore, the operability of the injection molding machine is not reduced, and damage to the device can be avoided.
【００２３】図３は、本発明のリング状逆止弁のさらに
他の実施例を示す説明的断面図である。図３に示すよう
に、本実施例のリング状逆止弁３１は、仮想線で示すシ
リンダ３２に挿着されたスクリュー３３の先端に取着さ
れるものであって、リング状逆止弁３１のシリンダ３２
と対面する側面３１ａには溝部３４が設けられている。
溝部３４は、側面３１ａの前方と後方との２ヵ所に複数
条ずつ設けられている。各溝部３４は、側面３１ａの全
周に亘って設けられている。FIG. 3 is an explanatory sectional view showing still another embodiment of the ring check valve of the present invention. As shown in FIG. 3, the ring check valve 31 of this embodiment is attached to the tip of a screw 33 inserted into a cylinder 32 indicated by a virtual line. Cylinder 32
A groove 34 is provided on the side surface 31a facing the groove 31.
A plurality of grooves 34 are provided at two positions, that is, at the front and rear of the side surface 31a. Each groove 34 is provided over the entire periphery of the side surface 31a.
【００２４】溝部３４は、図５に示すように、断面が大
略Ｕ字状で幅ｄは１ｍｍになっている。本実施例のリン
グ状逆止弁３１の側面３１ａの前方には、このような溝
部３４が０．２ｍｍ間隔で３条設けられている。As shown in FIG. 5, the groove 34 has a substantially U-shaped cross section and a width d of 1 mm. In front of the side surface 31a of the ring check valve 31 of the present embodiment, three such grooves 34 are provided at intervals of 0.2 mm.
【００２５】本実施例のリング状逆止弁３１によれば、
スクリュー３３が前進して射出材料を射出する際に射出
圧がかかり、射出材料が側面３１ａとシリンダ３２の内
周壁との間隙を通って逆流すると、射出材料が側面３１
ａの全周に亘って複数条設けられている溝部３４を横断
して流動する際に前記射出材料の流れに乱流が起き、流
路抵抗が大きくなるので、射出材料の逆流する量が低減
される。According to the ring check valve 31 of this embodiment,
When the injection pressure is applied when the screw 33 advances and injects the injection material, and the injection material flows backward through the gap between the side surface 31a and the inner peripheral wall of the cylinder 32, the injection material is moved to the side surface 31.
When flowing across the plurality of grooves 34 provided over the entire circumference of a, turbulence occurs in the flow of the injection material and the flow path resistance increases, so that the amount of the backflow of the injection material is reduced. Is done.
【００２６】前記各実施例に記載されたリング状逆止弁
によれば、金属マグネシウムまたはマグネシウム合金の
半凝固状態のスラリーの主に液相部分の逆流する量が低
減されるので、前記半凝固スラリーを一定の粘度で円滑
に射出することができ、偏析のない鋳造成形品を得るこ
とができる。According to the ring check valve described in each of the above embodiments, the amount of backflow mainly in the liquid phase portion of the semi-solidified slurry of metallic magnesium or magnesium alloy is reduced. The slurry can be smoothly injected with a constant viscosity, and a cast product without segregation can be obtained.
【００２７】前記各実施例に記載されたリング状逆止弁
は、金属マグネシウムまたはマグネシウム合金の半凝固
状態のスラリーのような極めて低粘度の射出材料の場合
に特に有利に使用することができるが、合成樹脂など一
般の射出材料に使用してもよい。The ring check valve described in each of the above embodiments can be used particularly advantageously in the case of an injection material having a very low viscosity, such as a semi-solid slurry of metallic magnesium or a magnesium alloy. Or a general injection material such as synthetic resin.
【００２８】[0028]
【発明の効果】以上のことから明らかなように、射出方
向側端面に環状溝を設けてなる本発明のリング状逆止弁
によれば、射出時の圧力により射出材料が前記環状溝に
圧入され、前記リング状逆止弁の側面が全周に亘ってシ
リンダ内面側に向かって拡大されるので、リング状逆止
弁とシリンダ内周壁との間隙が狭められ、前記射出材料
の逆流する量を低減することができる。前記リング状逆
止弁とシリンダ内周壁との間隙は、射出材料がシリンダ
先端部で圧縮され圧力が高まったときにだけ狭められ、
それ以外のときには適正な間隔を保っているので、射出
成形機の作動性を低下させることがなく、装置の損傷も
避けることができる。As is apparent from the above, according to the ring check valve of the present invention in which the annular groove is provided on the end face on the injection direction side, the injection material is pressed into the annular groove by the pressure at the time of injection. Since the side surface of the ring check valve is enlarged toward the inner surface of the cylinder over the entire circumference, the gap between the ring check valve and the inner peripheral wall of the cylinder is narrowed, and the amount of the backflow of the injection material is reduced. Can be reduced. The gap between the ring-shaped check valve and the inner peripheral wall of the cylinder is narrowed only when the injection material is compressed at the cylinder tip and the pressure is increased,
At other times, the proper spacing is maintained, so that the operability of the injection molding machine is not reduced and damage to the apparatus can be avoided.
【００２９】また、シリンダと対面する側面に溝部を設
けてなる本発明のリング状逆止弁によれば、射出時の圧
力により逆流する射出材料がリング状逆止弁のシリンダ
と対面する側面とシリンダの内周壁との間隙を流動する
際に、前記溝部を横断すると乱流が発生して漏れにくく
なり、前記射出材料の逆流する量を低減することができ
る。Further, according to the ring check valve of the present invention, in which a groove is provided on the side surface facing the cylinder, the injection material that flows backward due to the pressure at the time of injection is formed on the side surface facing the cylinder of the ring check valve. When flowing in the gap with the inner peripheral wall of the cylinder, turbulent flow is generated across the groove to make it difficult to leak, thereby reducing the amount of the injection material flowing backward.
【００３０】さらに、射出方向側端面に環状溝を設け、
シリンダと対面する側面に溝部を設けてなる本発明のリ
ング状逆止弁によれば、前記環状溝及び溝部による効果
がともに得られるので、前記射出材料の逆流する量をさ
らに低減することができる。Further, an annular groove is provided on the end face on the injection direction side,
According to the ring-shaped check valve of the present invention in which the groove is provided on the side surface facing the cylinder, the effects of the annular groove and the groove are both obtained, so that the amount of the injection material that flows backward can be further reduced. .
【００３１】本発明のリング状逆止弁は金属マグネシウ
ムまたはマグネシウム合金の半凝固状態のスラリーのよ
うな極めて低粘度の射出材料の場合に特に有利に使用さ
れ、前記半凝固状態のスラリーの主に液相部分の逆流す
る量が低減されるので、前記半凝固スラリーを一定の粘
度で円滑に射出することができ、前記金属または合金か
ら偏析のない優れた品質の鋳造成形品を得ることができ
る。The ring check valve of the present invention is particularly advantageously used for extremely low-viscosity injection materials such as semi-solid slurry of metallic magnesium or a magnesium alloy. Since the amount of backflow of the liquid phase portion is reduced, the semi-solidified slurry can be smoothly injected with a constant viscosity, and a cast molded article of excellent quality without segregation from the metal or alloy can be obtained. .
【図１】本発明のリング状逆止弁の一実施例を示す説明
的断面図。FIG. 1 is an explanatory sectional view showing one embodiment of a ring check valve of the present invention.
【図２】本発明のリング状逆止弁の他の実施例を示す説
明的断面図。FIG. 2 is an explanatory sectional view showing another embodiment of the ring check valve of the present invention.
【図３】本発明のリング状逆止弁のさらに他の実施例を
示す説明的断面図。FIG. 3 is an explanatory sectional view showing still another embodiment of the ring check valve of the present invention.
【図４】スクリュー式射出成形機の構成を示す説明的断
面図。FIG. 4 is an explanatory sectional view showing a configuration of a screw type injection molding machine.
【図５】図３に示すリング状逆止弁のＡ部の拡大正面
図。FIG. 5 is an enlarged front view of a portion A of the ring check valve shown in FIG. 3;
１１、２１、３１、４４…リング状逆止弁、 １２、２２、３２、４１…シリンダ、 １３、２３、３３、４２…スクリュー、 １４、２４…断面Ｖ字状の環状溝、 １５、３４…溝部。 11, 21, 31, 44 ... ring-shaped check valve, 12, 22, 32, 41 ... cylinder, 13, 23, 33, 42 ... screw, 14, 24 ... annular groove having a V-shaped cross section, 15, 34 ... Groove.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 実開 昭51−54170（ＪＰ，Ｕ) 実開 平４−33523（ＪＰ，Ｕ) 実開 平３−103726（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 45/00 - 45/84 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 51-54170 (JP, U) JP-A 4-33523 (JP, U) JP-A 3-103726 (JP, U) (58) Survey Field (Int.Cl. 7 , DB name) B29C 45/00-45/84
Claims (3)
着されたスクリューの先端部に取着され射出材料の逆流
を防止するリング状逆止弁であって、射出方向側端面に
射出時に圧入される該射出材料により該リング状逆止弁
の側面がシリンダ内面側に向かって拡大される環状溝を
設けてなることを特徴とするリング状逆止弁。1. A ring-shaped check valve attached to the tip of a screw inserted into a cylinder of a screw-type injection molding machine to prevent backflow of injection material, and press-fits an injection-direction-side end face at the time of injection. A ring-shaped check valve characterized in that an annular groove is provided in which the side surface of the ring-shaped check valve is enlarged toward the inner surface of the cylinder by the injected material.
着されたスクリューの先端部に取着され射出材料の逆流
を防止するリング状逆止弁であって、シリンダと対面す
る側面に射出時にシリンダと該側面との間に逆流して侵
入する該射出材料に乱流を起こす溝部を設けてなること
を特徴とするリング状逆止弁。2. A ring check valve which is attached to a tip of a screw inserted into a cylinder of a screw type injection molding machine and prevents backflow of an injection material. A ring-shaped check valve characterized in that a groove for causing a turbulent flow is provided between the cylinder and the side surface to cause a turbulent flow in the injected material that flows backward.
着されたスクリューの先端部に取着され射出材料の逆流
を防止するリング状逆止弁であって、射出方向側端面に
射出時に圧入される該射出材料により該リング状逆止弁
の側面がシリンダ内面側に向かって拡大される環状溝を
設け、シリンダと対面する側面に射出時にシリンダと該
側面との間に逆流して侵入する該射出材料に乱流を起こ
す溝部を設けてなることを特徴とするリング状逆止弁。3. A ring-shaped check valve attached to the tip of a screw inserted into a cylinder of a screw-type injection molding machine to prevent backflow of an injection material. The ring-shaped check valve is provided with an annular groove in which the side surface of the ring-shaped check valve is enlarged toward the inner surface of the cylinder by the injected material, and flows back into the side surface facing the cylinder between the cylinder and the side at the time of injection. A ring-shaped check valve characterized in that a turbulent groove is provided in the injection material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3193014A JP3017329B2 (en) | 1991-08-01 | 1991-08-01 | Ring check valve for injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3193014A JP3017329B2 (en) | 1991-08-01 | 1991-08-01 | Ring check valve for injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0531772A JPH0531772A (en) | 1993-02-09 |
| JP3017329B2 true JP3017329B2 (en) | 2000-03-06 |
Family
ID=16300757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3193014A Expired - Fee Related JP3017329B2 (en) | 1991-08-01 | 1991-08-01 | Ring check valve for injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3017329B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7291006B2 (en) * | 2004-06-24 | 2007-11-06 | Husky Injection Molding Systems Ltd. | Check valve lip seal for an injection molding machine |
-
1991
- 1991-08-01 JP JP3193014A patent/JP3017329B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0531772A (en) | 1993-02-09 |
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