JPH05147086A - Method and device for preventing wear of back-flow prevention device in injection molding machine - Google Patents
Method and device for preventing wear of back-flow prevention device in injection molding machineInfo
- Publication number
- JPH05147086A JPH05147086A JP33555791A JP33555791A JPH05147086A JP H05147086 A JPH05147086 A JP H05147086A JP 33555791 A JP33555791 A JP 33555791A JP 33555791 A JP33555791 A JP 33555791A JP H05147086 A JPH05147086 A JP H05147086A
- Authority
- JP
- Japan
- Prior art keywords
- backflow prevention
- screw
- prevention ring
- screw head
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (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、射出成形機の逆流防止
装置に関するもので、インラインスクリュ式射出成形機
において、溶融材料が射出・保圧工程中に逆流するのを
防止する逆流防止装置の耐久性に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backflow prevention device for an injection molding machine, and in an inline screw type injection molding machine, a backflow prevention device for preventing a molten material from backflowing during an injection / holding process. It is about durability.
【０００２】[0002]
【従来の技術】従来の射出成形機の逆流防止装置は、図
３に見られるように、逆流防止リング１３がスクリュヘ
ッド１４の外周に軸方向に移動可能に設けられ、可塑化
工程中においては、溶融材料の押出圧力によって逆流防
止リング１３はスクリュヘッド１４の背面に当たる位置
まで前進してスクリュ１１本体とスクリュヘッド１４の
間に固定された押金１２と逆流防止リング１３との間に
スクリュ１１本体から送られてくる溶融材料の通路を開
き、射出・保圧工程中においては、スクリュヘッド１４
充填部に発生する射出・保圧圧力によって逆流防止リン
グ１３の後端をスクリュ１１本体とスクリュヘッド１４
の間に固定された押金１２に密着する位置まで後退して
樹脂通路を遮断し溶融材料がスクリュ１１本体側に逆流
するのを防止している。そして、スクリュヘッド１４背
面の舌部１４ａと逆流防止リング１３先端の舌部１３ｂ
とが凹凸係合してスクリュヘッド１４の回転とともに回
転する連れ回り式逆流防止装置と、スクリュヘッド１４
背面と逆流防止リング１３先端がスクリユヘッド１４の
回転時に摺接する非連れ回り式逆流防止装置との２種類
が知られている。2. Description of the Related Art In a conventional backflow prevention device for an injection molding machine, as shown in FIG. 3, a backflow prevention ring 13 is provided on the outer periphery of a screw head 14 so as to be movable in the axial direction, and during a plasticizing process. The backflow prevention ring 13 moves forward to a position where it comes into contact with the back surface of the screw head 14 due to the extrusion pressure of the molten material, and the screw 11 main body is provided between the pusher 12 and the backflow prevention ring 13 fixed between the screw 11 main body and the screw head 14. Open the passage of the molten material sent from the screw head 14 during the injection / pressure holding process.
The back end of the backflow prevention ring 13 is moved to the screw 11 main body and the screw head 14 by the injection / holding pressure generated in the filling portion.
It is retracted to a position where it comes into close contact with the pusher 12 fixed between the two, and the resin passage is blocked to prevent the molten material from flowing backward to the screw 11 main body side. Then, the tongue portion 14a on the rear surface of the screw head 14 and the tongue portion 13b on the tip of the backflow prevention ring 13
And a backflow prevention device that rotates together with the rotation of the screw head 14, and
Two types are known: a backside and a backflow prevention ring 13 in which the tip of the backflow prevention ring 13 is in sliding contact when the screw head 14 rotates, and a non-rotating backflow prevention device.
【０００３】[0003]
【発明が解決しようとする課題】しかしながらこのよう
な従来の逆流防止装置の場合、高摩耗性物質を高い割合
で含有する成形材料、たとえば、ガラスやシリカや酸化
鉄などの入った熱可塑性樹脂や熱硬化性樹脂、プラマグ
原料やセラミックス粉末のバインダー調合物、および、
金属粉末のバインダー調合物などを射出成形する際、逆
流防止リングの外周面とシリンダの内面との狭い隙間に
高摩耗性物質が入り込むと高摩耗性物質を介して摺動す
るために摩耗速度が早くなり、また、抵抗増大によりカ
ジリを生じがちであった。本発明はこのような問題点を
解決することを目的としているものであり、シリンダ内
面の摩耗速度の低減およびカジリ防止を目的とするもの
である。However, in the case of such a conventional backflow prevention device, a molding material containing a high proportion of a highly abrasive substance, for example, a thermoplastic resin containing glass, silica, iron oxide or the like, Thermosetting resin, plamag raw material and ceramic powder binder formulation, and
When injection molding a binder mix of metal powder, etc., if a highly abrasive substance enters the narrow gap between the outer surface of the backflow prevention ring and the inner surface of the cylinder, it will slide through the highly abrasive substance and the wear rate will increase. It became faster, and the resistance increased, which tended to cause galling. The present invention is intended to solve such a problem, and is intended to reduce the wear rate of the cylinder inner surface and prevent galling.
【０００４】[0004]
【課題を解決するための手段】本発明は、スクリュ１１
先端部に装着したスクリュヘッド１４と、前記スクリュ
１１と前記スクリュヘッド１４の間に固定された押金１
２と、前記スクリュヘッド１４の外周に軸方向に移動可
能に設けられた逆流防止リング１３とを有し、前記逆流
防止リング１３の後端を前記押金１２に密着させること
により樹脂通路を閉鎖可能な射出成形機の逆流防止装置
において、前記逆流防止リング１３のシリンダ１０内面
と接触する外周面の摺動表面積を小さくしたことを特徴
としており、さらに、前記逆流防止リング１３のシリン
ダ１０内面と接触する外周面に、少なくとも１つの溝１
３ａを設けたことにより、上記問題点を解決する。DISCLOSURE OF THE INVENTION The present invention provides a screw 11
A screw head 14 mounted on the tip portion, and a pusher 1 fixed between the screw 11 and the screw head 14.
2 and a backflow prevention ring 13 provided on the outer circumference of the screw head 14 so as to be movable in the axial direction, and by closing the rear end of the backflow prevention ring 13 to the pusher 12, the resin passage can be closed. In a backflow prevention device of another injection molding machine, the sliding surface area of the outer peripheral surface of the backflow prevention ring 13 that comes into contact with the inner surface of the cylinder 10 is reduced, and further, the backflow prevention ring 13 contacts the inner surface of the cylinder 10 of the backflow prevention ring 13. At least one groove 1 on the outer peripheral surface
By providing 3a, the above problem is solved.
【０００５】[0005]
【作用】逆流防止リングの外周面とシリンダ内面との狭
い隙間に高摩耗性物質が入り込むと高摩耗性物質を介し
て摺動するために摩耗速度が早くなり、また抵抗増大に
よりカジリが発生しやすくなる。 そこで、本発明では
これを防止するため、摺動面の一方である逆流防止リン
グの外周面に溝を設け、摺動部の表面積を小さくするよ
うにした。これによって高摩耗性物質の噛み込み量が少
なくなり、摺動特性が改善され、摩耗速度が著しく減少
した。 また、抵抗も減少し、かじりも起こりにくくな
った。[Function] When a highly abradable substance enters the narrow gap between the outer circumferential surface of the backflow prevention ring and the inner surface of the cylinder, the abradable substance slides through the abradable substance to increase the wear rate and cause galling due to increased resistance. It will be easier. Therefore, in the present invention, in order to prevent this, a groove is provided on the outer peripheral surface of the backflow prevention ring, which is one of the sliding surfaces, to reduce the surface area of the sliding portion. As a result, the amount of highly abradable substances trapped was reduced, the sliding characteristics were improved, and the wear rate was significantly reduced. Also, the resistance was reduced and galling was less likely to occur.
【０００６】[0006]
【実施例】本発明の、実施例を図面と共に詳細に説明す
る。図１は、本発明による逆流防止リングの半断面図
で、図２は、本発明による逆流防止リングを逆流防止装
置に装着した半断面図である。これらの図から明らかな
ように、図２において、シリンダ１０の内部に配設され
たスクリュ１１先端部とスクリュヘッド１４の間に、押
金１２と逆流防止リング１３より構成される逆流防止装
置が配置されている。 押金１２は、ネジで結合された
スクリュ１０とスクリュヘッド１４の間に固定されてい
る。 逆流防止リング１３はスクリュヘッド１４の外周
に軸方向に移動可能に設けられており、スクリュヘッド
１４と一体になって回転する構成になっている。Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a half sectional view of a backflow prevention ring according to the present invention, and FIG. 2 is a half sectional view of the backflow prevention ring according to the present invention mounted on a backflow prevention device. As is clear from these drawings, in FIG. 2, a backflow prevention device including a pusher 12 and a backflow prevention ring 13 is arranged between the screw head 14 and the tip of the screw 11 disposed inside the cylinder 10. Has been done. The pusher plate 12 is fixed between a screw 10 and a screw head 14 which are screwed together. The backflow prevention ring 13 is provided on the outer periphery of the screw head 14 so as to be movable in the axial direction, and is configured to rotate integrally with the screw head 14.
【０００７】逆流防止リング１３の外周面とシリンダ１
０の内面との間には若干の隙間が設けられており、特
に、逆流防止リング１３の外周面の中央部には溝１３ａ
を設けている。 尚、この溝１３ａは、一本でも複数本
でも良く、溝１３ａが一本の場合、図１においては逆流
防止リング１３の突起部１３ｃが前後に２ケ所示されて
いるが１ケ所でも良い。The outer peripheral surface of the backflow prevention ring 13 and the cylinder 1
A slight gap is provided between the inner surface of the backflow prevention ring 13 and the inner surface of the backflow prevention ring 13.
Is provided. The number of the grooves 13a may be one or plural, and when the number of the grooves 13a is one, two protrusions 13c of the backflow prevention ring 13 are shown in the front and rear in FIG. 1, but may be one. ..
【０００８】次にこの実施例の作用について説明する。
可塑化工程中は、スクリュ１１の押出圧力によって逆流
防止リング１３はスクリュヘッド１４の背面に当たる位
置まで前進（図２の右方より左方に進み）し、溶融材料
は逆流防止リング１３の後端と押金１２の前面との隙間
を通り、さらには、逆流防止リング１３の内面とスクリ
ュヘッド１４の外周面との隙間を通って前方に流れる。
可塑化工程中は、逆流防止リング１３とスクリュヘッ
ド１４とは、一体となって回転する。Next, the operation of this embodiment will be described.
During the plasticizing process, the backflow prevention ring 13 is advanced by the extrusion pressure of the screw 11 to a position where it comes into contact with the back surface of the screw head 14 (progress from the right side to the left side in FIG. 2), and the molten material has the rear end of the backflow prevention ring 13. Through the gap between the inner surface of the backflow prevention ring 13 and the outer peripheral surface of the screw head 14, and flows forward.
During the plasticizing process, the backflow prevention ring 13 and the screw head 14 rotate integrally.
【０００９】射出・保圧工程中には、射出・保圧圧力に
よって逆流防止リング１３が後退（図２の左方より右方
に進み）し、逆流防止リング１３後端と押金１２の前面
とが密着し、スクリュ１１前方の溶融材料と、スクリュ
１１構内の材料とが完全に遮断される。During the injection / pressure-holding process, the backflow prevention ring 13 retracts (advance from the left side to the right side in FIG. 2) by the injection / pressure-holding pressure, and the back end of the backflow prevention ring 13 and the front face of the presser plate 12 are pushed. Adhere to each other, and the molten material in front of the screw 11 and the material inside the screw 11 are completely cut off.
【００１０】逆流防止リング１３が作動する過程におい
て、逆流防止リング１３外周面とシリンダ１０内面との
狭い隙間に高摩耗性物質が入り込むと高摩耗性物質を介
して摺動するために摩耗速度が早くなり、また抵抗増大
によりカジリが発生しやすくなるが、本発明ではこれを
防止するため、摺動面の一方である逆流防止リングの外
周面に溝を設け、摺動部の表面積を小さくするようにし
た。 これにより、高摩耗性物質の噛み込み量が少なく
なり摺動特性が改善され摩耗速度が著しく減少する。
また、抵抗も減少し、かじりも起こりにくくなる。 も
ちろん、逆流防止リング本来の役目であるシール性は、
全く損なわれることはない。In the process of operation of the backflow prevention ring 13, if a high wear substance enters into the narrow gap between the outer circumferential surface of the back flow prevention ring 13 and the inner surface of the cylinder 10, the high wear substance slides through the high wear substance, and the wear rate increases. Scratch easily occurs due to the increased resistance and the increased resistance, but in the present invention, in order to prevent this, a groove is provided on the outer peripheral surface of the backflow prevention ring, which is one of the sliding surfaces, to reduce the surface area of the sliding portion. I did it. As a result, the amount of the highly abradable substance trapped is reduced, the sliding characteristics are improved, and the wear rate is significantly reduced.
Also, the resistance is reduced and galling is less likely to occur. Of course, the sealability, which is the original function of the backflow prevention ring,
It is not damaged at all.
【００１１】[0011]
【発明の効果】本発明と従来例との比較試験の結果を示
す。 本発明における、逆流防止リング外周中央部の溝の形状 全長に対して２／３の長さで、１ｍｍの深さ 成形条件 使用機種：１００Ｔｏｎの型締力を有する射出成形機 成形材料：ＳｉＣ／バインダ調合物（ＳｉＣ含有率８０
ｗｔ％） 成形温度：供給部（１３０℃）、圧縮部（１５０℃）、 計量化部（１７０℃）、ノズル部（１７０℃） スクリュ回転数：１００ｒｐｍ 射出圧力：１７８０Ｋｇ／ｃｍ2 保圧力： ７００Ｋｇ／ｃｍ2 上記条件で総量１５０Ｋｇを成形 結果 摩耗量 本発明・・・シリンダ（０．０４５ｍｍ） 逆流防止リング（０．２７ｍｍ） 従来例・・・シリンダ（０．１５ｍｍ） 逆流防止リング（０．２７ｍｍ） カジリの発生は全く無かった。 以上の結果から明らかなように、本発明による逆流防止
装置を用いれば、高摩耗性物質の摺動面への噛み込みが
少なくなるので、シリンダ内面の摩耗速度を大幅に低減
することができ、また、カジリも防止することが出来
た。The results of a comparative test between the present invention and a conventional example are shown. The shape of the groove in the outer peripheral central portion of the backflow prevention ring in the present invention, with a length of 2/3 with respect to the total length and a depth of 1 mm Molding condition Model used: injection molding machine with mold clamping force of 100 Ton Molding material: SiC Binder formulation (SiC content 80
wt%) Molding temperature: supply part (130 ° C.), compression part (150 ° C.), metering part (170 ° C.), nozzle part (170 ° C.) Screw rotation speed: 100 rpm Injection pressure: 1780 Kg / cm 2 Holding pressure: 700 Kg / Cm 2 A total amount of 150 kg is formed under the above conditions Wear amount Present invention: Cylinder (0.045 mm) Backflow prevention ring (0.27 mm) Conventional example: Cylinder (0.15 mm) Backflow prevention ring (0.27 mm) ) No galling occurred at all. As is clear from the above results, if the backflow prevention device according to the present invention is used, biting of the highly abradable substance on the sliding surface is reduced, and thus the wear rate of the cylinder inner surface can be significantly reduced. In addition, it was possible to prevent galling.
【図１】本発明による逆流防止リングの半断面図FIG. 1 is a half sectional view of a backflow prevention ring according to the present invention.
【図２】本発明による逆流防止リングを逆流防止装置に
装着したときの半断面図FIG. 2 is a half sectional view of a backflow prevention ring according to the present invention mounted on a backflow prevention device.
【図３】従来の逆流防止リングを逆流防止装置に装着し
たときの半断面図FIG. 3 is a half cross-sectional view when a conventional backflow prevention ring is attached to a backflow prevention device.
１０・・・・シリンダ １１・・・・スクリュ １２・・・・押金 １３・・・・逆流防止リング １３ａ・・・溝 １３ｂ・・・舌 １３ｃ・・・突起部 １４・・・・スクリュヘッド １４ａ・・・舌 10 ... Cylinder 11 ... Screw 12 ... Pusher 13 ... Backflow prevention ring 13a ... Groove 13b ... Tongue 13c. ···tongue
Claims (2)
リュヘッド（１４）と、前記スクリュ（１１）と前記ス
クリュヘッド（１４）の間に固定された押金（１２）
と、前記スクリュヘッド（１４）の外周に軸方向に移動
可能に設けられた逆流防止リング（１３）とを有し、前
記逆流防止リング（１３）の後端を前記押金（１２）に
密着させることにより樹脂通路を閉鎖可能な射出成形機
の逆流防止装置において、 前記逆流防止リング（１３）のシリンダ（１０）内面と
接触する外周面の摺動表面積を小さくしたことを特徴と
する射出成形機の逆流防止装置摩耗防止方法。1. A screw head (14) mounted on the tip of a screw (11), and a pusher (12) fixed between the screw (11) and the screw head (14).
And a backflow prevention ring (13) provided on the outer periphery of the screw head (14) so as to be movable in the axial direction, and the rear end of the backflow prevention ring (13) is brought into close contact with the pressing metal (12). Thus, in the backflow prevention device of the injection molding machine capable of closing the resin passage, the sliding surface area of the outer peripheral surface of the backflow prevention ring (13) that contacts the inner surface of the cylinder (10) is reduced. Backflow prevention device wear prevention method.
リュヘッド（１４）と、前記スクリュ（１１）と前記ス
クリュヘッド（１４）の間に固定された押金（１２）
と、前記スクリュヘッド（１４）の外周に軸方向に移動
可能に設けられた逆流防止リング（１３）とを有し、前
記逆流防止リング（１３）の後端を前記押金（１２）に
密着させることにより樹脂通路を閉鎖可能な射出成形機
の逆流防止装置において、 前記逆流防止リング（１３）のシリンダ（１０）内面と
接触する外周面に、少なくとも１つの溝（１３ａ）を設
けたことを特徴とする射出成形機の逆流防止装置。2. A screw head (14) mounted on a tip portion of the screw (11), and a pusher (12) fixed between the screw (11) and the screw head (14).
And a backflow prevention ring (13) provided on the outer periphery of the screw head (14) so as to be movable in the axial direction, and the rear end of the backflow prevention ring (13) is brought into close contact with the pressing metal (12). In the backflow prevention device of the injection molding machine capable of closing the resin passage, at least one groove (13a) is provided on the outer peripheral surface of the backflow prevention ring (13) that contacts the inner surface of the cylinder (10). A backflow prevention device for injection molding machines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33555791A JPH05147086A (en) | 1991-11-26 | 1991-11-26 | Method and device for preventing wear of back-flow prevention device in injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33555791A JPH05147086A (en) | 1991-11-26 | 1991-11-26 | Method and device for preventing wear of back-flow prevention device in injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05147086A true JPH05147086A (en) | 1993-06-15 |
Family
ID=18289916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33555791A Pending JPH05147086A (en) | 1991-11-26 | 1991-11-26 | Method and device for preventing wear of back-flow prevention device in injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05147086A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0558251U (en) * | 1992-01-16 | 1993-08-03 | 川口鉄工株式会社 | Backflow prevention ring of injection molding machine |
| SG91887A1 (en) * | 1999-11-12 | 2002-10-15 | Sumitomo Heavy Industries | Back-flow prevention apparatus and method of operating an injection apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5053453A (en) * | 1973-09-12 | 1975-05-12 |
-
1991
- 1991-11-26 JP JP33555791A patent/JPH05147086A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5053453A (en) * | 1973-09-12 | 1975-05-12 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0558251U (en) * | 1992-01-16 | 1993-08-03 | 川口鉄工株式会社 | Backflow prevention ring of injection molding machine |
| SG91887A1 (en) * | 1999-11-12 | 2002-10-15 | Sumitomo Heavy Industries | Back-flow prevention apparatus and method of operating an injection apparatus |
| US6613265B1 (en) | 1999-11-12 | 2003-09-02 | Sumitomo Heavy Industries, Ltd. | Method of operating a back-flow prevention apparatus |
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