JPH0160406B2 - - Google Patents
Info
- Publication number
- JPH0160406B2 JPH0160406B2 JP60087442A JP8744285A JPH0160406B2 JP H0160406 B2 JPH0160406 B2 JP H0160406B2 JP 60087442 A JP60087442 A JP 60087442A JP 8744285 A JP8744285 A JP 8744285A JP H0160406 B2 JPH0160406 B2 JP H0160406B2
- Authority
- JP
- Japan
- Prior art keywords
- backflow prevention
- hardness
- prevention ring
- pusher
- end surface
- 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
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
- B29C2045/526—Abrasion resistant means in the screw head or non-return device
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Producing Shaped Articles From Materials (AREA)
Description
【発明の詳細な説明】
(イ) 産業上の利用分野
本発明は、射出成形機の逆流防止装置、特にセ
ラミツク調合金、プラスチツクマグネツト原料な
どのように摩耗原因となる物質を含有する溶融材
料を射出成形する射出成形機に対して有効な逆流
防止装置、に関するものである。[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a backflow prevention device for an injection molding machine, especially for molten materials containing substances that cause wear, such as ceramic-like alloys and raw materials for plastic magnets. This invention relates to a backflow prevention device that is effective for injection molding machines that injection mold.
(ロ) 従来の技術
従来の射出成形機の逆流防止装置としては、例
えば実公和58−21708号公報に示されるものがあ
る。このような射出成形機の逆流防止装置は、ス
クリユ先端部に取り付けられるスクリユヘツド
と、スクリユヘツドの外周に設けられる逆流防止
リングと、から構成される。逆流防止リングの外
径はシリンダの内径部にはめ合わされており、ま
た逆流防止リングは軸方向に所定距離だけ移動可
能であり、これにより逆流防止リングの一方の端
面をスクリユヘツドに固定された押し金の対応す
る面に接触させ、樹脂通路を閉鎖することができ
る。可塑化中はスクリユの押出し圧力によつて溶
融材料をスクリユヘツド前方へ流すことができ、
また射出・保圧中は逆流防止リングの一方の端面
が押し金と接触してスクリユヘツド前方の溶融材
料が逆流することを防止することができる。(b) Prior Art A conventional backflow prevention device for an injection molding machine is disclosed in, for example, Japanese Utility Model Publication No. 58-21708. Such a backflow prevention device for an injection molding machine is comprised of a screw head attached to the tip of the screw and a backflow prevention ring provided around the outer periphery of the screw head. The outer diameter of the backflow prevention ring is fitted to the inner diameter of the cylinder, and the backflow prevention ring is movable in the axial direction by a predetermined distance, thereby allowing one end surface of the backflow prevention ring to be attached to a pusher fixed to the screw head. The resin passageway can be closed by contacting the corresponding surface of the resin. During plasticization, the extrusion pressure of the screw allows the molten material to flow toward the front of the screw head.
Further, during injection and pressure holding, one end surface of the backflow prevention ring comes into contact with the pusher metal, thereby preventing the molten material in front of the screw head from flowing back.
(ハ) 発明が解決しようとする問題点
しかし、このような従来の射出成形機の逆流防
止装置には、逆流防止リング及び押し金が摩耗、
割れなどを発生し、短期間の内に成形不能となり
やすいという問題点がある。すなわち、射出時及
び保圧時は逆流防止リングは溶融材料圧力によつ
て押し金に押圧され、これらの接触面間に溶融材
料に含まれている非常に固いセラミツク粒子、ガ
ラス繊維などをかみ込み、両接触面に摩耗が発生
する。このため逆流防止リング及び押し金の両方
を早期に交換する必要が発生する。本発明は、上
記のような問題点を解決することを目的としてい
る。(c) Problems to be Solved by the Invention However, in the backflow prevention device of such a conventional injection molding machine, the backflow prevention ring and pusher are worn out,
There is a problem that cracks occur and it tends to become impossible to mold within a short period of time. That is, during injection and pressure holding, the backflow prevention ring is pressed against the presser by the pressure of the molten material, and the extremely hard ceramic particles, glass fibers, etc. contained in the molten material are caught between these contact surfaces. , wear occurs on both contact surfaces. For this reason, it becomes necessary to replace both the backflow prevention ring and the pusher at an early stage. The present invention aims to solve the above problems.
(ニ) 問題点を解決するための手段
本発明は、逆流防止リング及び押し金の母材と
して高硬度合金材料を用いると共に逆流防止リン
グ側の接触端面は押し金の母材よりも硬度を高く
することにより、上記問題点を解決する。すなわ
ち、本発明による射出成形機の逆流防止装置は、
逆流防止リングの母材をHv750以上の硬度（Hv
はビツカース硬さ）を有する高硬度合金材料製と
し、逆流防止リングの押し金と接触する端面を
Hv900〜1500の硬度としてある。押し金もHv750
以上の硬度を有する高硬度合金材料製としてあ
る。ただし、逆流防止リングの接触端面の硬度は
押し金の硬度よりも高くしてある。(d) Means for solving the problems The present invention uses a high-hardness alloy material as the base material of the backflow prevention ring and the pusher metal, and the contact end surface on the backflow prevention ring side has a hardness higher than that of the base material of the pusher metal. By doing so, the above problem is solved. That is, the backflow prevention device for an injection molding machine according to the present invention has the following features:
The base material of the backflow prevention ring has a hardness of Hv750 or higher (Hv
is made of a high-hardness alloy material with a hardness of
It has a hardness of Hv900 to 1500. Push money is also Hv750
It is made of a high-hardness alloy material that has a hardness higher than that. However, the hardness of the contact end surface of the backflow prevention ring is higher than that of the pusher metal.
(ホ) 作用
射出時及び保圧時には、逆流防止リングは溶融
材料の圧力によつて押し金に押し付けられる。逆
流防止リングと押し金との接触面間には溶融材料
中に含まれている非常に固い粒子等がかみ込まれ
るが、逆流防止リングの接触端面は母材である高
硬度合金材料の硬度よりも更に硬度を高くしてあ
る。従つて、逆流防止リングの接触端面は非常に
耐摩耗性に優れており、固い含有粒子などをかみ
込んだとしても摩耗の発生が防止される。また、
接触端面のみを非常に高硬度とし、それ以外の部
分は母材硬度としてあるため、割れが発生しにく
くなつており、大きな力、衝撃力などが作用した
としても、割れを発生することはない。また、押
し金の硬度も逆流防止リングの母材と同程度の硬
度としてある。従つて、押し金も耐摩耗性が向上
している。ただし、逆流防止リングの接触端面の
方が押し金よりも硬度が高いため、逆流防止リン
グの摩耗を防止することとができるのに加えて、
摩耗が発生したとしても必ず押し金側で発生する
ことになるので、押し金のみを交換すればよいこ
とになる。(E) Action During injection and pressure holding, the backflow prevention ring is pressed against the pusher by the pressure of the molten material. Very hard particles contained in the molten material are trapped between the contact surface between the backflow prevention ring and the pusher metal, but the contact end surface of the backflow prevention ring is harder than the base material, which is a high-hardness alloy material. The hardness has also been increased. Therefore, the contact end surface of the backflow prevention ring has excellent wear resistance, and even if hard particles are caught, the occurrence of wear is prevented. Also,
Only the contact end surface has extremely high hardness, and the other parts have the hardness of the base material, making it difficult for cracks to occur, and even if large forces or impact forces are applied, no cracks will occur. . Further, the hardness of the presser metal is set to be about the same as that of the base material of the backflow prevention ring. Therefore, the pusher metal also has improved wear resistance. However, since the contact end surface of the backflow prevention ring is harder than the pusher, it is possible to prevent wear of the backflow prevention ring, and
Even if wear occurs, it will always occur on the pusher side, so it is only necessary to replace the pusher.
(ヘ) 実施例
第１図に本発明の実施例を示す。シリンダ２０
内に配置されるスクリユ２２の先端部にスクリユ
ヘツド２４がねじによつて一体に取り付けられて
いる。また、スクリユ２２とスクリユヘツド２４
との間には両者によつてはさみ付けることにより
押し金２５が固定されている。スクリユヘツド２
４の外周には逆流防止リング２６が設けられてい
る。逆流防止リング２６の外径はシリンダ２０の
内径にはめ合わされている。スクリユヘツド２４
に設けられた切欠き部２４ａに逆流防止リング２
６の前端部２６ａがかみ合つている。従つて、逆
流防止リング２６はスクリユヘツド２４といつし
よに回転する。逆流防止リング２６は所定量だけ
軸方向へ移動可能としてある。すなわち、逆流防
止リング２６の前端部２６ａ側はスクリユヘツド
２４によつて規制され、また後側の端面２６ｂ側
は押し金２５の端面２５ｂによつて規制されてい
る。スクリユヘツド２４は、例えば工具鋼製であ
り、Hv600〜800の硬度を有している。押し金２
５及び逆流防止リング２６は例えば鉄クロムほう
化物、タングステンカーバイド系合金、窒化チタ
ンなどの高硬度合金材料製であり、母材はHv750
以上の硬度を有している。また、押し金２５の端
面２５ｂと接触する逆流防止リング２６の端面２
６ｂは、例えばチタンカーバイドの硬化層を作る
などの表面処理によつて、あるいは鉄クロムほう
化物などの組成を変えることによつて、Hv900〜
1500の硬度の硬化層としてある。硬化層の厚さは
0.01mm〜５mmである。この端面２６ｂの硬度は押
し金２５の端面２５ｂよりもHv150以上高くして
ある。(f) Example FIG. 1 shows an example of the present invention. cylinder 20
A screw head 24 is integrally attached to the tip of a screw 22 disposed inside the screw head 24 with a screw. In addition, the screw 22 and the screw head 24
A presser metal 25 is fixed between the two by being sandwiched between the two. Screw head 2
A backflow prevention ring 26 is provided on the outer periphery of 4. The outer diameter of the backflow prevention ring 26 is fitted to the inner diameter of the cylinder 20. Screw head 24
The backflow prevention ring 2 is inserted into the notch 24a provided in the
The front end portions 26a of 6 are engaged with each other. Therefore, the backflow prevention ring 26 rotates together with the screw head 24. The backflow prevention ring 26 is movable in the axial direction by a predetermined amount. That is, the front end 26a side of the backflow prevention ring 26 is regulated by the screw head 24, and the rear end surface 26b side is regulated by the end surface 25b of the pusher 25. The screw head 24 is made of tool steel, for example, and has a hardness of 600 to 800 Hv. pusher 2
5 and the backflow prevention ring 26 are made of a high hardness alloy material such as iron chromium boride, tungsten carbide alloy, titanium nitride, etc., and the base material is Hv750.
It has a hardness of Also, the end surface 2 of the backflow prevention ring 26 that contacts the end surface 25b of the pusher 25
6b can be heated to Hv900 to
It is a hardened layer with a hardness of 1500. The thickness of the hardened layer is
It is 0.01 mm to 5 mm. The hardness of this end surface 26b is higher than that of the end surface 25b of the pusher 25 by Hv150 or more.
この射出成形機を用いた可塑化中は、スクリユ
２２の押出圧力によつて逆流防止リング２６は前
方（第１図中で左側）に移動し、例えば、溶融し
たセラミツクス調合物は押し金２５の端面２５ｂ
と逆流防止リング２６の端面２６ｂとの間を通つ
てシリンダ２０の先端側へ流れる。また、射出時
及び保圧時は、逆流防止リング２６よりも前方側
の溶融材料圧力によつて逆流防止リング２６は後
退し、押し金２５の端面２５ｂと接触する。第１
図にはこの状態が示してある。この状態では押し
金２５の端面２５ｂと逆流防止リング２６の端面
２６ｂとの間に固いセラミツクス粒子などがかみ
込まれるが、逆流防止リング２６の端面２６ｂは
上述のようにHV900〜1500の硬度を有する硬化
層としてあるため、非常に耐摩耗性が高く、ほと
んど摩耗を発生することがない。また、非常に高
い硬度としてあるのは端面２６ｂだけであり、逆
流防止リング２６の本体は高硬度合金材料の母材
硬度としてあるため、割れに対する抵抗力が強
く、容易に割れを発生することはない。従つて、
逆流防止リング２６は摩耗、割れなどを発生する
ことなく、長期間にわたつて使用することができ
る。また押し金２５も高硬度合金材料製であり、
十分な耐摩耗性を有している。従つて、射出成形
機の逆流防止装置の寿命を大幅に延長させること
ができる。なお、逆流防止リング２６の端面２６
ｂの硬度が押し金２５の端面２５ｂの硬度より高
いため、摩耗が発生するとすれば必ず押し金２５
側に発生する。この場合には形状が小さく簡単な
押し金２５のみを交換すればよく、スクリユヘツ
ド２４又は逆流防止リング２６を交換するよりも
有利である。なお、この実施例は、逆流防止リン
グがスクリユヘツドと一体に回転する形式のもの
について説明したものであり、本発明は逆流防止
リングが回転しない形式のものについても適用可
能である。 During plasticization using this injection molding machine, the extrusion pressure of the screw 22 moves the backflow prevention ring 26 forward (to the left in FIG. End surface 25b
and the end surface 26b of the backflow prevention ring 26 to the distal end side of the cylinder 20. Further, during injection and pressure holding, the backflow prevention ring 26 retreats due to the pressure of the molten material on the front side of the backflow prevention ring 26 and comes into contact with the end surface 25b of the pusher 25. 1st
This situation is shown in the figure. In this state, hard ceramic particles or the like are caught between the end surface 25b of the pusher 25 and the end surface 26b of the backflow prevention ring 26, but the end surface 26b of the backflow prevention ring 26 has a hardness of HV900 to 1500 as described above. Because it is a hardened layer, it has very high wear resistance and almost never wears out. In addition, only the end face 26b has extremely high hardness, and the main body of the backflow prevention ring 26 has a base material hardness of a high-hardness alloy material, so it has strong resistance to cracking and does not easily crack. do not have. Therefore,
The backflow prevention ring 26 can be used for a long period of time without wear or cracking. Further, the pusher 25 is also made of a high hardness alloy material,
Has sufficient wear resistance. Therefore, the life of the backflow prevention device of the injection molding machine can be significantly extended. Note that the end surface 26 of the backflow prevention ring 26
Since the hardness of b is higher than the hardness of the end surface 25b of the pusher 25, if wear occurs, the pusher 25
Occurs on the side. In this case, only the small and simple pusher 25 needs to be replaced, which is more advantageous than replacing the screw head 24 or the backflow prevention ring 26. Note that this embodiment describes a type in which the backflow prevention ring rotates together with the screw head, but the present invention is also applicable to a type in which the backflow prevention ring does not rotate.
(ト) 発明の効果
以上説明してきたように、本発明によると、逆
流防止リング及び押し金はHv750以上の硬度を有
する高硬度合金材料製とし、逆流防止リングの押
し金との接触端面のみの硬度を表面処理などによ
つてHv900〜1500としたので、逆流防止リングの
摩耗、割れなどの発生を防止して耐久性を向上す
ることができる。押し金も上記のように高硬度合
金材料製としてあるが、逆流防止リングの接触端
面は更に硬度が高くしてあるので、摩耗が発生す
るとすれば押し金側である。この場合には、押し
金のみを交換すればよく、表面処理などによつて
比較的価格の高い逆流防止リングは交換する必要
がなく、経済的である。(G) Effects of the Invention As explained above, according to the present invention, the backflow prevention ring and pusher are made of a high-hardness alloy material having a hardness of Hv750 or higher, and only the end surface of the backflow prevention ring that contacts the pusher is Since the hardness is set to Hv900-1500 through surface treatment, it is possible to prevent the backflow prevention ring from abrasion, cracking, etc. and improve its durability. The pusher is also made of a high-hardness alloy material as described above, but since the contact end surface of the backflow prevention ring is made even harder, if any wear occurs, it is on the pusher. In this case, it is only necessary to replace the pusher, and there is no need to replace the backflow prevention ring, which is relatively expensive due to surface treatment, so it is economical.
第１図は本発明の実施例を示す図である。
２２……スクリユ、２４……スクリユヘツド、
２５……押し金、２６……逆流防止リング、２６
ｂ……端面。
FIG. 1 is a diagram showing an embodiment of the present invention. 22...Skuriyu, 24...Skuriyuhead,
25... Push metal, 26... Backflow prevention ring, 26
b...End face.
Claims (1)
ツドと、スクリユとスクリユヘツドとの間に固定
される押し金と、スクリユヘツドの外周に軸方向
に移動可能に設けられる逆流防止リングとを有
し、逆流防止リングの一方の端面を押し金に密着
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、 逆流防止リングの母材をHv750以上の硬度を有
する高硬度合金材料とし、逆流防止リングの押し
金と接触する端面をHv900〜1500の硬度とし、押
し金はHv750以上の硬度を有する高硬度合金材料
製とし、逆流防止リングの上記端面の硬度は押し
金の硬度よりも高くしたことを特徴とする射出成
形機の逆流防止装置。 ２ 逆流防止リングの上記端面の硬度と押し金の
硬度との差をHv150以上とした特許請求の範囲第
１項記載の射出成形機の逆流防止装置。[Scope of Claims] 1. A screw head that is attached to the tip of the screw, a pusher that is fixed between the screw and the screw head, and a backflow prevention ring that is movable in the axial direction on the outer periphery of the screw head, In a backflow prevention device for an injection molding machine that can close the resin passage by bringing one end of the backflow prevention ring into close contact with a pusher metal, the base material of the backflow prevention ring is made of a high-hardness alloy material with a hardness of Hv750 or higher to prevent backflow. The end surface of the prevention ring that comes into contact with the pusher has a hardness of Hv900 to 1500, the pusher is made of a high-hardness alloy material with a hardness of Hv750 or more, and the hardness of the end surface of the backflow prevention ring is higher than the hardness of the pusher. A backflow prevention device for an injection molding machine, which is characterized by: 2. The backflow prevention device for an injection molding machine according to claim 1, wherein the difference in hardness between the end surface of the backflow prevention ring and the hardness of the pusher is Hv150 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8744285A JPS61246031A (en) | 1985-04-25 | 1985-04-25 | Anti-backflow device of injection molder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8744285A JPS61246031A (en) | 1985-04-25 | 1985-04-25 | Anti-backflow device of injection molder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61246031A JPS61246031A (en) | 1986-11-01 |
| JPH0160406B2 true JPH0160406B2 (en) | 1989-12-22 |
Family
ID=13914970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8744285A Granted JPS61246031A (en) | 1985-04-25 | 1985-04-25 | Anti-backflow device of injection molder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61246031A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2718800B1 (en) * | 1994-04-13 | 1996-07-12 | Alain Georges Rene Viron | Self-centering floating pin valve with two support points on flats machined or forged at a given angle. |
| DE19849472C2 (en) * | 1998-10-21 | 2002-11-28 | Demag Ergotech Gmbh | Non-return valve for the plasticizing and injection screw in injection molding machines |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58163221U (en) * | 1982-04-23 | 1983-10-31 | 株式会社日本製鋼所 | Backflow prevention device for injection molding machine |
-
1985
- 1985-04-25 JP JP8744285A patent/JPS61246031A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61246031A (en) | 1986-11-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |