JPH11216754A - Injection molding machine for thermosetting resin - Google Patents
Injection molding machine for thermosetting resinInfo
- Publication number
- JPH11216754A JPH11216754A JP21069798A JP21069798A JPH11216754A JP H11216754 A JPH11216754 A JP H11216754A JP 21069798 A JP21069798 A JP 21069798A JP 21069798 A JP21069798 A JP 21069798A JP H11216754 A JPH11216754 A JP H11216754A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- screw
- outer diameter
- molding machine
- injection molding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- 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、熱硬化性樹脂の射
出成形機において、スクリュー先端部及びシリンダー先
端部に逆流防止機構と樹脂圧縮部を有し、この逆流防止
機構によるクッション成形にて安定な連続成形を行うこ
とができ、且つ樹脂圧縮部で樹脂計量時にはせん断発熱
により溶融樹脂温度を上昇させ、射出時にはバックフロ
ーの低減が可能な射出成形機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermosetting resin injection molding machine, which has a backflow prevention mechanism and a resin compression section at a screw tip and a cylinder tip, and is stable by cushion molding by the backflow prevention mechanism. The present invention relates to an injection molding machine capable of performing a continuous molding process, increasing the temperature of a molten resin by shearing heat when measuring a resin in a resin compression section, and reducing a backflow during an injection.
【０００２】本発明において、保圧とは、射出が完了し
金型内に溶融した熱硬化性樹脂成形材料が充填した後、
射出後樹脂圧力を一定時間保持することをいう。保圧の
目的は、金型内で硬化し収縮し始めている成形品をその
ままにしておくと、成形品はヒケや空洞が生じるので、
収縮分を補給して、金型内への樹脂材料の充填を良くす
るためのものであり、成形品の品質に非常に重要な役割
を果たす。保圧の条件は調整できるようになっており、
保圧の圧力と保圧をかける時間が不足すると成形品にヒ
ケを生じ、逆に圧力の高すぎ、時間の長すぎは成形品に
歪みを残したりバリの原因となる。一般に、熱硬化性樹
脂成形材料は金型内で硬化すると収縮するので、樹脂の
硬化収縮が大きいほど、あるいは成形品の肉厚が大きい
ほど、保圧による効果が期待される。In the present invention, the holding pressure means that after injection is completed and a molten thermosetting resin molding material is filled in a mold,
This means that the resin pressure is maintained for a certain time after injection. The purpose of holding pressure is that if the molded product that has been hardening and shrinking in the mold is left as it is, the molded product will have sink marks and cavities,
It is for replenishing the shrinkage and improving the filling of the resin material into the mold, and plays a very important role in the quality of the molded product. The conditions for holding pressure can be adjusted,
If the holding pressure and the time for applying the holding pressure are insufficient, the molded product will have sink marks. Conversely, if the pressure is too high and the time is too long, the molded product may be left with distortion or cause burrs. In general, a thermosetting resin molding material shrinks when cured in a mold. Therefore, as the curing shrinkage of the resin increases or as the thickness of the molded product increases, the effect of holding pressure is expected.
【０００３】クッション成形とは、保圧を十分効果的に
行うために射出終了後にスクリュー先端部に溶融樹脂材
料を少量残しておき、この溶融樹脂により保圧を与える
成形方法であり、安定な成形が可能となる。樹脂材料の
逆流（バックフロー）が大きいと保圧を十分にかける前
にスクリューが最前の位置まで前進してしまい保圧を十
分にかけることができない。[0003] Cushion molding is a molding method in which a small amount of a molten resin material is left at the tip of a screw after the end of injection in order to sufficiently maintain the pressure, and the pressure is maintained by the molten resin. Becomes possible. If the backflow of the resin material is large, the screw moves forward to the foremost position before sufficient dwelling pressure is applied, so that dwelling pressure cannot be applied sufficiently.
【０００４】[0004]
【従来の技術】従来、熱硬化性樹脂用射出成形機のスク
リューは、樹脂材料の溶融時に加熱シリンダー内で樹脂
材料が硬化しないように低圧縮比のフルフライトスクリ
ューが使用されている。フルフライトスクリューは、ス
クリューの外周に等ピッチで溝が設けられているもの
で、射出成形時に樹脂材料の逆流が発生し、クッション
成形が難しく安定な成形が出来ないことが多い。ここ
で、熱硬化性樹脂は、フェノール樹脂、エポキシ樹脂、
メラミン樹脂、不飽和ポリエステル樹脂、ジアクリルフ
タレート樹脂、ユリア樹脂、シリコン樹脂などである。2. Description of the Related Art Conventionally, as a screw of an injection molding machine for thermosetting resin, a full flight screw having a low compression ratio is used so that the resin material is not cured in a heating cylinder when the resin material is melted. Full-flight screws are provided with grooves at equal pitches on the outer periphery of the screw, and a backflow of the resin material occurs at the time of injection molding, so that cushion molding is difficult and stable molding cannot be performed in many cases. Here, the thermosetting resin is a phenol resin, an epoxy resin,
Melamine resin, unsaturated polyester resin, diacryl phthalate resin, urea resin, silicone resin and the like.
【０００５】図１は、現在最も一般的に使用されている
インラインスクリュー式熱硬化性樹脂射出成形機におけ
る加熱シリンダー及びスクリューの概略断面図である。
図１において、ホッパー１４内の樹脂材料はスクリュー
の回転に伴い、フライト１２を持つスクリュー１１に沿
って前方に運ばれ、溶融されて加熱シリンダー１３の先
端部に所定量充填される（溶融樹脂が加熱シリンダー先
端部に所定量充填されることを計量という）。その後、
金型１５内に射出されるが、射出終了までの間にスクリ
ューに逆流防止機構がないためスクリューに沿って充填
され計量された樹脂材料がバックフローして必要な量を
射出することができない。そして、バックフローのた
め、安定した成形に必要な保圧を十分にかけることが難
しい。このため、逆流防止リングやピストン機能を持っ
たスクリューが試みられている。スクリュー先端部にピ
ストン機能を持ったスクリューでは、スリーブ部分にピ
ストンが入るまでは、通常のフルフライトスクリューと
同じであるためバックフローを防止することができな
い。逆流防止リングを持ったスクリューでは、射出時の
バックフローは低減できるが、計量時の樹脂材料の発熱
によりシリンダー内での溶融樹脂の熱安定性が低下し、
硬化又は固化した樹脂の除去等、成形終了時の作業性が
よくない。FIG. 1 is a schematic sectional view of a heating cylinder and a screw in an in-line screw type thermosetting resin injection molding machine most commonly used at present.
In FIG. 1, the resin material in the hopper 14 is carried forward along the screw 11 having the flight 12 with the rotation of the screw, is melted, and is filled in a predetermined amount into the tip of the heating cylinder 13 (the molten resin is filled). Filling the heating cylinder tip with a predetermined amount is called weighing). afterwards,
The resin material is injected into the mold 15, but the screw does not have a backflow prevention mechanism until the end of the injection, so that the resin material filled and measured along the screw is back-flowed and the required amount cannot be injected. And, due to the backflow, it is difficult to sufficiently apply the holding pressure necessary for stable molding. For this reason, a backflow prevention ring and a screw having a piston function have been tried. With a screw having a piston function at the screw tip, backflow cannot be prevented until the piston enters the sleeve because it is the same as a normal full flight screw. With a screw with a backflow prevention ring, the backflow during injection can be reduced, but the heat stability of the resin material during measurement reduces the thermal stability of the molten resin in the cylinder,
Poor workability at the end of molding, such as removal of cured or solidified resin.
【０００６】[0006]
【発明が解決しようとする課題】本発明においては、加
熱シリンダー先端部にスリーブ部分を、スクリュー先端
部にピストン部分と樹脂圧縮部を設け、これらの部分に
より樹脂材料のバックフローの防止と樹脂温度の上昇が
可能となり、計量時、加熱シリンダー先端部に、射出に
必要な一定の樹脂量が確保されるとともに、射出時クッ
ション成形のために必要な樹脂量を残し、保圧が十分に
確保できることにより安定成形が可能となる。そして、
逆流防止リングがないことにより樹脂材料の発熱が抑え
られ加熱シリンダー内での硬化が抑制されるため、熱安
定性が向上し、熱硬化性樹脂のクッション成形を可能に
するものである。In the present invention, a sleeve portion is provided at the tip of the heating cylinder, and a piston portion and a resin compression portion are provided at the tip of the screw. These portions prevent the backflow of the resin material and the resin temperature. As a result, a constant amount of resin required for injection is secured at the tip of the heating cylinder during weighing, and the amount of resin required for cushion molding at the time of injection is left, ensuring sufficient pressure retention. This enables stable molding. And
Without the backflow prevention ring, heat generation of the resin material is suppressed and curing in the heating cylinder is suppressed, so that thermal stability is improved and cushioning of the thermosetting resin can be performed.
【０００７】そして、樹脂圧縮部により、樹脂計量時に
はスクリューに圧縮比がついたものとなり、せん断発熱
により樹脂温度の上昇が可能となり、射出時には、樹脂
圧縮部の逆流防止機能により溶融樹脂のバックフローを
低減する事が可能となる。そして、スクリュー先端部に
ピストン部分と樹脂圧縮部とを形成することにより、樹
脂圧縮部でせん断発熱により樹脂温度が上昇し、樹脂粘
度の低下が可能となり、ピストン部での磨耗が低減され
る。When the resin is measured, the screw has a compression ratio when the resin is metered, and the resin temperature can be raised by shearing heat. At the time of injection, the backflow of the molten resin is prevented by the backflow preventing function of the resin compression unit. Can be reduced. By forming the piston portion and the resin compressing portion at the tip of the screw, the resin temperature rises due to shear heat generated in the resin compressing portion, the resin viscosity can be reduced, and wear at the piston portion is reduced.
【０００８】[0008]
【課題を解決しようとする手段】本発明は、熱硬化性樹
脂の射出成形機において、スクリュー先端部に下記の構
成要件（１）、（２）、（３）及び（４）からなる逆流
防止機構と樹脂圧縮機構とを有することを特徴とする射
出成形機。 （１）スクリュー先端部にスクリュー本体の外径（Ｄ
２）より小さい外径（ｄ２）のピストン部分が設けられ
ていること、（２））シリンダー先端部に加熱シリンダ
ー本体内径より小さい内径のスリーブ部分が設けられて
いること、（３）前記ピストン部分の長さ（ａ）とスリ
ーブ部分の長さ（ｂ）、及びピストン部分とスリーブ部
分とのクリアランス（ｔ）は、樹脂材料を射出した後の
保圧時にスクリュー先端部にクッション成形のため樹脂
材料が残存しうる長さ及びクリアランスであること、及
び（４）ピストン部の後方に、ピストン部外径（ｄ２）
より大きく、スクリュー外径（Ｄ２）より小さい径の樹
脂圧縮部が設けられていること。本発明においては、好
ましくは、樹脂圧縮部８に溝９を形成することにより、
混練度の向上と溶融樹脂の流路が確保できるため樹脂の
熱安定性の向上が可能となる。According to the present invention, there is provided a thermosetting resin injection molding machine, wherein a backflow prevention comprising the following constituent elements (1), (2), (3) and (4) is provided at the tip of a screw. An injection molding machine comprising a mechanism and a resin compression mechanism. (1) The outer diameter of the screw body (D
2) A piston portion having a smaller outer diameter (d2) is provided; (2)) A sleeve portion having an inner diameter smaller than the inner diameter of the heating cylinder body is provided at the tip of the cylinder; The length (a), the length (b) of the sleeve portion, and the clearance (t) between the piston portion and the sleeve portion are determined by the resin material for cushion molding at the tip of the screw when the pressure is maintained after the resin material is injected. Is a length and a clearance that can remain, and (4) a piston portion outer diameter (d2) behind the piston portion.
A resin compression section having a diameter larger than the screw outer diameter (D2) is provided. In the present invention, preferably, the groove 9 is formed in the resin compression section 8 so that
Since the degree of kneading can be improved and the flow path of the molten resin can be secured, the thermal stability of the resin can be improved.
【０００９】熱硬化性樹脂の射出成形機において、通
常、シリンダー内径及びスクリュー外径（Ｄ２）は２０
〜８０ｍｍであり、より一般的には３０〜６５ｍｍであ
る。またスクリュー内径（Ｄ１）とスクリュー外径（Ｄ
２）との比は、通常０．６５〜０．８５で、より一般的
には０．７〜０．８である。そして、本発明において、
好ましくは、ピストン部分の長さ（ａ）及びスリーブ部
分の長さ（ｂ）がともに２ｍｍ以上スクリュー外径（Ｄ
２）以下であること、ピストン部分とスリーブ部分のク
リアランス（ｔ）が０．０５〜３ｍｍであること、ピス
トン部分の外径（ｄ２）とスクリュー部分の外径（Ｄ
２）の比が０．５以上１未満であること、樹脂圧縮部の
長さ（ｌ）が２ｍｍ以上スクリュー部分の外径（Ｄ２）
以下であること、及びピストン部の外径（ｄ２）と樹脂
圧縮部の外径（ｄ１）の比が０．５以上１未満であるこ
との一つ又は二つ以上を構造的特徴とする。また、樹脂
圧縮部の外径（ｄ１）は、通常スクリュー内径（Ｄ１）
以上スクリュー外径（Ｄ２）以下である。In a thermosetting resin injection molding machine, the inner diameter of the cylinder and the outer diameter of the screw (D2) are usually 20.
８０80 mm, more usually 30-65 mm. The screw inner diameter (D1) and the screw outer diameter (D
The ratio to 2) is usually 0.65 to 0.85, more usually 0.7 to 0.8. And in the present invention,
Preferably, the length (a) of the piston portion and the length (b) of the sleeve portion are both 2 mm or more and the screw outer diameter (D
2) the following, clearance (t) between the piston part and the sleeve part is 0.05 to 3 mm, outer diameter (d2) of the piston part and outer diameter (D) of the screw part
The ratio of 2) is 0.5 or more and less than 1, and the length (l) of the resin compressed portion is 2 mm or more and the outer diameter (D2) of the screw portion.
It is a structural feature that one or more of the following is satisfied and the ratio of the outer diameter (d2) of the piston portion to the outer diameter (d1) of the resin compression portion is 0.5 or more and less than 1. In addition, the outer diameter (d1) of the resin compression section is usually the inner diameter (D1) of the screw.
It is not more than the screw outer diameter (D2).
【００１０】[0010]
【発明の実施の形態】以下、図２、図３及び図４によっ
て本発明を詳細に説明する。図２は、本発明の熱硬化性
樹脂の射出成形機（一例）の概略断面図である。この射
出成形機は、スクリュー先端部に設けられたピストン部
分、及び）シリンダー先端部に設けられたスリーブ部分
からなる逆流防止機構と樹脂圧縮機構とを有する射出成
形機である。図２において、ホッパー４に投入された樹
脂材料はスクリューの回転に伴い、フライト２を持つス
クリュー１に沿って運ばれ、溶融され、加熱シリンダー
３の先端部に充填され計量される。その後スクリューを
前進させて樹脂材料が金型５内に射出されるが、ピスト
ン部分６とスリーブ部分７が嵌合した後は、バックフロ
ーを抑え、保圧をかけるのに必要なクッションが得ら
れ、十分な保圧をかけることができるようになる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to FIGS. 2, 3 and 4. FIG. FIG. 2 is a schematic cross-sectional view of a thermosetting resin injection molding machine (one example) of the present invention. This injection molding machine is an injection molding machine having a backflow prevention mechanism including a piston portion provided at a screw tip portion and a sleeve portion provided at a cylinder tip portion, and a resin compression mechanism. In FIG. 2, the resin material charged into the hopper 4 is carried along the screw 1 having the flight 2 with the rotation of the screw, melted, filled into the tip of the heating cylinder 3, and measured. Thereafter, the resin material is injected into the mold 5 by advancing the screw, but after the piston portion 6 and the sleeve portion 7 are fitted, the cushion necessary for suppressing the backflow and applying the pressure is obtained. , Sufficient pressure can be applied.
【００１１】図３は、本発明の射出成形機のスクリュー
及びシリンダー先端部の拡大図である。計量時には、溶
融樹脂は、スクリュー回転に伴いフライト２に沿ってピ
ストン部６へと運ばれるが、スクリュー内径（Ｄ１）よ
り大きい外径（ｄ１）の樹脂圧縮部８でのせん断発熱に
より樹脂温度が上昇し、溶融樹脂粘度の低下が生じシリ
ンダー先端部１０に充填される。射出時には、先端のピ
ストン部分６がスリーブ部分７に嵌合するまでは樹脂圧
縮部８が逆流防止部となり、バックフローを低減させる
が、ピストン部分６がスリーブ部分７に嵌合してからは
ピストン部分が逆流防止部となり、十分に保圧をかける
ことが出来る。さらには、樹脂温度の上昇、混練度の向
上、樹脂粘度の低下によりピストン部分６のスクリュー
磨耗が低減される。FIG. 3 is an enlarged view of the tip of the screw and the cylinder of the injection molding machine of the present invention. At the time of measurement, the molten resin is conveyed to the piston portion 6 along with the flight 2 along with the rotation of the screw. As a result, the viscosity of the molten resin decreases, and the molten resin is filled in the cylinder tip 10. At the time of injection, the resin compression portion 8 functions as a backflow prevention portion until the piston portion 6 at the distal end is fitted to the sleeve portion 7 to reduce the backflow, but after the piston portion 6 is fitted to the sleeve portion 7, The part serves as a backflow prevention part, and a sufficient pressure can be applied. Furthermore, screw abrasion of the piston portion 6 is reduced by increasing the resin temperature, improving the kneading degree, and decreasing the resin viscosity.
【００１２】ピストン部分６の長さ（ａ）及びスリーブ
部分７の長さ（ｂ）は、十分な逆流防止効果を発揮させ
るために、ともに２ｍｍ以上スクリュー外径（Ｄ２）以
下であることが好ましい。２ｍｍ未満の場合では、嵌合
する部分の長さが短いために樹脂材料の射出時に逆流防
止効果が不十分であり、バックフローが発生しクッショ
ン成形を有効に行うことができない。一方、スクリュー
外径（Ｄ２）を越える長さとした場合には、嵌合する部
分が長すぎるためピストン部分とスリーブ部分のかじり
及び破損が発生したり、発熱により溶融樹脂の硬化が生
じる恐れがある。ピストン部分６及びスリーブ部分７の
長さは、逆流防止効果、ピストン部分とスリーブ部分の
嵌合性、加工精度等の理由により５〜１０ｍｍがさらに
好ましい。この長さ（ａ）及び（ｂ）は、溶融樹脂の粘
度が小さいほど長くすることが好ましい。Both the length (a) of the piston portion 6 and the length (b) of the sleeve portion 7 are preferably not less than 2 mm and not more than the screw outer diameter (D2) in order to exert a sufficient backflow preventing effect. . In the case of less than 2 mm, the length of the fitting portion is short, so that the effect of preventing the backflow at the time of injecting the resin material is insufficient, and the backflow occurs, so that the cushion molding cannot be effectively performed. On the other hand, when the length exceeds the screw outer diameter (D2), the fitting portion is too long, so that the piston portion and the sleeve portion may be galled and damaged, or the molten resin may be hardened due to heat generation. . The lengths of the piston portion 6 and the sleeve portion 7 are more preferably 5 to 10 mm from the viewpoints of the backflow preventing effect, the fitting property between the piston portion and the sleeve portion, the processing accuracy, and the like. It is preferable that the lengths (a) and (b) be longer as the viscosity of the molten resin is smaller.
【００１３】更に、ピストン部分６とスリーブ部分７と
の長さの関係については、通常両者ほぼ同じであるが、
一方を他方より２〜５ｍｍ程度長くしてもよい。ピスト
ン部分とスリーブ部分とのクリアランス（ｔ）は、十分
な逆流防止効果を発揮させるために、０．０５〜３ｍｍ
とするのが好ましい。０．０５ｍｍ以下の場合では、ク
リアランスがほとんどないためにピストン部分とスリー
ブ部分にかじりが生じることがあり、このため生産性効
率が低くなり有効ではない。３ｍｍを超えると、クリア
ランスが大きすぎるために逆流防止効果が不完全となり
バックフローが発生しクッション成形を有効に行うこと
ができない。ピストン部分とスリーブ部分とのクリアラ
ンス（ｔ）は、逆流防止効果と前記かじりの防止のため
に、０．１〜２ｍｍがより好ましく、０．１〜０．５ｍ
ｍが一層好ましい。Further, the relationship between the length of the piston portion 6 and the length of the sleeve portion 7 is generally almost the same,
One may be about 2 to 5 mm longer than the other. The clearance (t) between the piston portion and the sleeve portion is 0.05 to 3 mm in order to exhibit a sufficient backflow prevention effect.
It is preferred that When the thickness is less than 0.05 mm, there is almost no clearance, so that the piston portion and the sleeve portion may be galled, which lowers productivity efficiency and is not effective. If it exceeds 3 mm, the backflow prevention effect is incomplete because the clearance is too large, and backflow occurs, so that the cushion molding cannot be performed effectively. The clearance (t) between the piston portion and the sleeve portion is preferably 0.1 to 2 mm, more preferably 0.1 to 0.5 m, in order to prevent backflow and prevent the galling.
m is more preferred.
【００１４】また、ピストン部分の外径（ｄ２）とスク
リュー部分の外径（Ｄ２）との比は、安定なクッション
成形を行うために、０．５以上１未満とすることが好ま
しい。０．５未満の場合では、ピストン部分の外径とス
クリュー部分の外径の違いが大きいため、ピストン部分
で射出圧力が大きく上昇してしまい、過大なバリを発生
したり金型の損傷を引き起こしたりする恐れがあり、更
に、ピストン部分６が細くなるためにスクリューの強度
が不足することがある。ピストン部分６の外径とスクリ
ュー部分１の外径の比は、０．７〜０．９がさらに好ま
しい。本発明において、ピストン部分の外径（ｄ２）
は、通常１０〜７０ｍｍであり、更に好ましくは１５〜
７０ｍｍである。The ratio between the outer diameter (d2) of the piston portion and the outer diameter (D2) of the screw portion is preferably 0.5 or more and less than 1 in order to perform stable cushion molding. If it is less than 0.5, the difference between the outer diameter of the piston part and the outer diameter of the screw part is large, so that the injection pressure at the piston part rises greatly, causing excessive burr and damaging the mold. In addition, the strength of the screw may be insufficient due to the thinning of the piston portion 6. The ratio of the outer diameter of the piston portion 6 to the outer diameter of the screw portion 1 is more preferably 0.7 to 0.9. In the present invention, the outer diameter (d2) of the piston portion
Is usually 10 to 70 mm, more preferably 15 to 70 mm.
70 mm.
【００１５】樹脂圧縮部の長さ（ｌ）は、短すぎると磨
耗が大きく、長すぎると計量のための時間が長くなるた
め３〜１０ｍｍが好ましい。樹脂圧縮部とシリンダーと
のクリアランス（ｓ）は、大きすぎるとせん断発熱によ
る樹脂温度の上昇の効果が小さく、小さすぎると樹脂温
度が上昇しすぎて先端部での硬化が発生するようになる
ため１〜４ｍｍが好ましい。ピストン部の外径（ｄ２）
と樹脂圧縮部の外径（ｄ１）の比は、ピストン部分の外
径（ｄ２）とスクリュー部分の外径（Ｄ２）との比の場
合と同様の理由により、０．５以上１未満が好ましく、
０．７〜０．９がさらに好ましい。以上のような本発明
の射出成形機の形状において、最も好ましい態様は、ス
クリュー外径（Ｄ２）が４０ｍｍである場合、スクリュ
ー内径（Ｄ１）が２７〜３２ｍｍであり、ピストン部分
６の長さ（ａ）及びスリーブ部分７の長さ（ｂ）がとも
に１０〜１５ｍｍ、ピストン部分６の外径（ｄ２）が２
７〜３２ｍｍ、クリアランス（ｔ）が０．２〜０．３ｍ
ｍであり、樹脂圧縮部８の長さ（ｌ）が５〜８ｍｍ、そ
の外径（ｄ１）が３４〜３６ｍｍであり、クリアランス
（ｓ）が２〜３ｍｍである。[0015] The length (l) of the resin compressed portion is preferably 3 to 10 mm because if it is too short, abrasion is large, and if it is too long, the time for measurement becomes long. If the clearance (s) between the resin compression part and the cylinder is too large, the effect of increasing the resin temperature due to shear heat is small, and if it is too small, the resin temperature rises too much and hardening occurs at the tip. 1-4 mm is preferred. Outer diameter of piston part (d2)
The ratio of the outer diameter (d1) of the resin compression portion to the outer diameter (d2) of the piston portion and the outer diameter (D2) of the screw portion is preferably 0.5 or more and less than 1 for the same reason. ,
0.7-0.9 is more preferred. In the shape of the injection molding machine of the present invention as described above, the most preferable aspect is that when the screw outer diameter (D2) is 40 mm, the screw inner diameter (D1) is 27 to 32 mm, and the length of the piston portion 6 ( a) and the length (b) of the sleeve portion 7 are both 10 to 15 mm, and the outer diameter (d2) of the piston portion 6 is 2
7-32mm, clearance (t) 0.2-0.3m
m, the length (l) of the resin compressed portion 8 is 5 to 8 mm, its outer diameter (d1) is 34 to 36 mm, and the clearance (s) is 2 to 3 mm.
【００１６】樹脂圧縮部８の後部は、通常はある傾きで
より小径化する。図４に示したように樹脂圧縮部８に溝
９を形成することにより混練度の向上と溶融樹脂の流路
が確保できるため熱安定性の向上が可能となる。樹脂圧
縮部の溝形状は、幅が広すぎると混練効果があまりな
く、バックフローも大きくなる。狭すぎると混練効果が
強くなりすぎ溶融樹脂の硬化が促進される為、幅２〜２
０ｍｍが好ましい。溝数は、溶融樹脂の熱安定性向上の
ために、溝の幅やヘッド作製時間を考慮して、２〜１２
カ所が好ましいが、特に限定されるものではない。The rear portion of the resin compression section 8 usually has a smaller diameter at a certain inclination. As shown in FIG. 4, by forming the groove 9 in the resin compression section 8, the degree of kneading can be improved and the flow path of the molten resin can be secured, so that the thermal stability can be improved. If the width of the groove of the resin compression portion is too wide, the kneading effect is not so large, and the backflow becomes large. If the width is too small, the kneading effect becomes too strong and the curing of the molten resin is accelerated.
0 mm is preferred. The number of grooves is 2 to 12 in consideration of the width of the grooves and the head manufacturing time in order to improve the thermal stability of the molten resin.
The positions are preferred, but not particularly limited.
【００１７】[0017]
【発明の効果】ピストン部分を有するスクリュー先端部
のピストン部分の後部に樹脂圧縮部を設けることによ
り、樹脂材料の計量時、せん断発熱により樹脂温度を上
昇させ、樹脂粘度の低下、射出時のバックフローの低
減、ピストン部分のスクリュー磨耗の低減が図られる。
射出時の逆流防止機構により樹脂材料はスクリュー後方
にバックフローすることなく金型内に射出充填される。
このため樹脂材料の溶融粘度、射出速度、及び射出圧力
などの成形条件が変動しても、実質的に射出するために
計量された樹脂材料がバックフローすることがない。そ
してこのために、樹脂量が常に一定して金型内に射出充
填されるので、バリの少ない成形が可能となる。また、
クッション成形が可能になり、必要な保圧を確実にかけ
ることが可能になるため、変動の少ない安定した連続成
形を行うことができる。さらに、樹脂圧縮部に溝加工を
施すことにより混練度の向上と樹脂計量時に流路が確保
できるため溶融樹脂材料の熱安定性が向上する。According to the present invention, a resin compression portion is provided at the back of the piston at the tip of the screw having the piston to increase the temperature of the resin due to heat generated by shearing during the measurement of the resin material, to lower the resin viscosity, and to reduce the back pressure during injection. The flow is reduced, and the screw wear of the piston part is reduced.
The resin material is injected and filled into the mold without backflow behind the screw by the backflow prevention mechanism at the time of injection.
For this reason, even if the molding conditions such as the melt viscosity, the injection speed, and the injection pressure of the resin material change, the resin material measured for injection does not substantially flow back. For this reason, the resin is always injected and filled in the mold with a constant amount, so that molding with less burrs is possible. Also,
Cushioning can be performed, and necessary holding pressure can be reliably applied, so that stable continuous molding with little fluctuation can be performed. Further, by performing groove processing on the resin compression section, the degree of kneading can be improved and a flow path can be secured during resin measurement, so that the thermal stability of the molten resin material is improved.
【図１】 従来の熱硬化性樹脂用射出成形機の概略断面
図FIG. 1 is a schematic sectional view of a conventional thermosetting resin injection molding machine.
【図２】 本発明の熱硬化性樹脂用射出成形機（一例）
の概略断面図FIG. 2 shows an injection molding machine for a thermosetting resin of the present invention (one example).
Schematic sectional view of
【図３】 図２のスクリュー及びシリンダー先端部の拡
大図FIG. 3 is an enlarged view of the tip of the screw and the cylinder in FIG. 2;
【図４】 図２のスクリュー及びシリンダー先端部の拡
大図で、樹脂圧縮部に溝加工を施した場合。FIG. 4 is an enlarged view of a tip portion of a screw and a cylinder in FIG. 2 when a groove is formed in a resin compression portion.
１ スクリュー ２ フライト ３ 加熱シリンダー ４ ホッパー ５ 成形金型 ６ ピストン部分 ７ スリーブ部分 ８ 樹脂圧縮部 ９ 溝部分 １０ シリンダー先端部 １１ スクリュー １２ フライト １３ 加熱シリンダー １４ ホッパー １５ 成形金型 DESCRIPTION OF SYMBOLS 1 Screw 2 Flight 3 Heating cylinder 4 Hopper 5 Molding die 6 Piston part 7 Sleeve part 8 Resin compression part 9 Groove part 10 Cylinder tip part 11 Screw 12 Flight 13 Heating cylinder 14 Hopper 15 Molding die
Claims (7)
クリュー先端部に下記の構成要件（１）、（２）、
（３）及び（４）からなる逆流防止機構と樹脂圧縮機構
とを有することを特徴とする射出成形機。 （１）スクリュー先端部にスクリュー本体の外径（Ｄ
２）より小さい外径（ｄ２）のピストン部分が設けられ
ていること、（２）シリンダー先端部に加熱シリンダー
本体内径より小さい内径のスリーブ部分が設けられてい
ること、（３）前記ピストン部分の長さ（ａ）とスリー
ブ部分の長さ（ｂ）、及びピストン部分とスリーブ部分
とのクリアランス（ｔ）は、樹脂材料を射出した後の保
圧時にスクリュー先端部にクッション成形のため樹脂材
料が残存しうる長さ及びクリアランスであること、及び
（４）ピストン部の後方に、ピストン部外径（ｄ２）よ
り大きく、スクリュー外径（Ｄ２）より小さい径の樹脂
圧縮部が設けられていること。1. In a thermosetting resin injection molding machine, the following constituent requirements (1), (2),
An injection molding machine comprising a backflow prevention mechanism comprising (3) and (4) and a resin compression mechanism. (1) The outer diameter of the screw body (D
(2) a piston portion having a smaller outer diameter (d2) is provided; (2) a sleeve portion having an inner diameter smaller than the inner diameter of the heating cylinder main body is provided at the tip of the cylinder; The length (a), the length (b) of the sleeve portion, and the clearance (t) between the piston portion and the sleeve portion are such that the resin material is used to form a cushion at the tip of the screw during the pressure holding after the resin material is injected. (4) A resin compression section having a diameter larger than the piston outer diameter (d2) and smaller than the screw outer diameter (D2) is provided behind the piston section. .
けられている請求項１記載の射出成形機。2. The injection molding machine according to claim 1, wherein a groove through which the molten resin passes is provided in the resin compression section.
部分の長さ（ｂ）がともに２ｍｍ以上スクリュー外径
（Ｄ２）以下である請求項１又は２記載の射出成形機。3. The injection molding machine according to claim 1, wherein the length (a) of the piston portion and the length (b) of the sleeve portion are both 2 mm or more and the screw outer diameter (D2) or less.
ランス（ｔ）が０．０５〜３ｍｍである請求項１、２又
は３記載の射出成形機。4. The injection molding machine according to claim 1, wherein the clearance (t) between the piston portion and the sleeve portion is 0.05 to 3 mm.
ー部分の外径（Ｄ２）の比が０．５以上１未満である請
求項１、２、３又は４記載の射出成形機。5. The injection molding machine according to claim 1, wherein a ratio of an outer diameter (d2) of the piston portion to an outer diameter (D2) of the screw portion is 0.5 or more and less than 1.
クリュー部分の外径（Ｄ２）以下である請求項１、２、
３、４又は５記載の射出成形機。6. The resin compressed part according to claim 1, wherein the length (l) is not less than 2 mm and not more than the outer diameter (D2) of the screw part.
The injection molding machine according to 3, 4, or 5.
の外径（ｄ１）の比が０．５以上１未満であり、樹脂圧
縮部の外径（ｄ１）がスクリュー内径（Ｄ１）以上スク
リュー外径（Ｄ２）以下である請求項１、２、３、４、
５又は６記載の射出成形機。7. The ratio of the outer diameter (d2) of the piston portion to the outer diameter (d1) of the resin compression portion is 0.5 or more and less than 1, and the outer diameter (d1) of the resin compression portion is equal to the screw inner diameter (D1). The screw diameter is not more than the screw outer diameter (D2).
7. The injection molding machine according to 5 or 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21069798A JPH11216754A (en) | 1997-07-25 | 1998-07-27 | Injection molding machine for thermosetting resin |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20052397 | 1997-07-25 | ||
| JP32472497 | 1997-11-26 | ||
| JP9-200523 | 1997-11-26 | ||
| JP9-324724 | 1997-11-26 | ||
| JP21069798A JPH11216754A (en) | 1997-07-25 | 1998-07-27 | Injection molding machine for thermosetting resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11216754A true JPH11216754A (en) | 1999-08-10 |
Family
ID=27327829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21069798A Pending JPH11216754A (en) | 1997-07-25 | 1998-07-27 | Injection molding machine for thermosetting resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11216754A (en) |
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