JP2001088179A - Screw head device of injection molding machine - Google Patents
Screw head device of injection molding machineInfo
- Publication number
- JP2001088179A JP2001088179A JP27068599A JP27068599A JP2001088179A JP 2001088179 A JP2001088179 A JP 2001088179A JP 27068599 A JP27068599 A JP 27068599A JP 27068599 A JP27068599 A JP 27068599A JP 2001088179 A JP2001088179 A JP 2001088179A
- Authority
- JP
- Japan
- Prior art keywords
- screw head
- ring
- injection molding
- molding machine
- spacer
- 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.)
- Granted
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)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は樹脂の逆流防止機構
を備える射出成形機のスクリュヘッド装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw head device for an injection molding machine having a resin backflow prevention mechanism.
【０００２】[0002]
【従来の技術】従来、スクリュヘッド軸部に、リングバ
ルブを前後にスライド自在に装填した樹脂の逆流防止機
構を備える射出成形機のスクリュヘッド装置は知られて
いる。この種のスクリュヘッド装置は、計量時にリング
バルブが前方に変位し、スクリュにより可塑化された樹
脂が、リングバルブの内周面とスクリュヘッド軸部間に
設けられた樹脂通路を通ってスクリュヘッド頭部の前方
に移動して計量が行われるとともに、射出時にはリング
バルブが後方に変位し、スクリュヘッド頭部の前方に計
量された樹脂が後方に逆流するのを防止する機能を有す
る。2. Description of the Related Art Conventionally, there has been known a screw head device of an injection molding machine having a resin backflow prevention mechanism in which a ring valve is slidably mounted in a screw head shaft portion so as to be slidable back and forth. In this type of screw head device, the ring valve is displaced forward during metering, and the resin plasticized by the screw passes through a resin passage provided between the inner peripheral surface of the ring valve and the screw head shaft. It has the function of moving forward of the head and performing metering, and displacing the ring valve rearward during injection, thereby preventing the resin metered in front of the screw head from backflowing backward.
【０００３】ところで、このようなスクリュヘッド装置
では、リングバルブの内周面とスクリュヘッド軸部間
に、樹脂通路（後側樹脂通路）を確保することから、こ
の後側樹脂通路からスクリュヘッド頭部の前端に至る前
側樹脂通路を設ける必要がある。このため、例えば、実
開平３−８４１２５号公報等では、前側樹脂通路をリン
グバルブに形成したタイプが開示されている。しかし、
このタイプは、リングバルブに前側樹脂通路となる孔部
又は凹凸部を形成する必要があり、しかも、これらの孔
部又は凹凸部は軸方向直角に設けるため、孔部又は凹凸
部を設ける部位は薄肉形成する必要があるなど、リング
バルブの前部に強度的に弱い部分が生ずるとともに、形
状が複雑となり加工性に劣る欠点があった。By the way, in such a screw head device, a resin passage (rear resin passage) is secured between the inner peripheral surface of the ring valve and the screw head shaft portion. It is necessary to provide a front resin passage leading to the front end of the part. For this reason, for example, Japanese Utility Model Laid-Open No. 3-84125 discloses a type in which a front resin passage is formed in a ring valve. But,
In this type, it is necessary to form a hole or an uneven portion serving as a front resin passage in the ring valve, and since these holes or the uneven portion are provided at a right angle in the axial direction, the portion where the hole or the uneven portion is provided is In addition to the need to form a thin wall, a weak portion is formed at the front of the ring valve, and the shape is complicated, resulting in poor workability.
【０００４】一方、このような欠点の無いタイプとし
て、スクリュヘッド頭部に、軸方向の前側樹脂通路を設
けたタイプも、例えば、特公平３−１２５３１号公報等
で開示されている。[0004] On the other hand, as a type free from such defects, a type in which an axial front resin passage is provided in a screw head is disclosed in, for example, Japanese Patent Publication No. 3-12531.
【０００５】[0005]
【発明が解決しようとする課題】しかし、スクリュヘッ
ドに前側樹脂通路を設けるタイプでは、リングバルブに
対する加工は不要になるものの、スクリュヘッド頭部に
形成した前側樹脂通路によってスクリュヘッド頭部の後
端に凹凸が生じ、計量時にこの凹凸がリングバルブに圧
接しつつ回転することから、リングバルブの端面が凹凸
の摺接によって減耗し、リングバルブの耐久性が損なわ
れる問題があった。However, in the type in which the front resin passage is provided in the screw head, the processing for the ring valve becomes unnecessary, but the rear end of the screw head head is formed by the front resin passage formed in the screw head head. As a result, there is a problem that the end face of the ring valve is worn out due to the sliding contact of the unevenness, and the durability of the ring valve is impaired.
【０００６】本発明はこのような従来の技術に存在する
課題を解決したものであり、スクリュヘッドに前側樹脂
通路を設けるタイプにおけるリングバルブの減耗を確実
に防止し、リングバルブの耐久性を高めることができる
射出成形機のスクリュヘッド装置の提供を目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the problems existing in the prior art, and reliably prevents the wear of a ring valve in a type in which a front resin passage is provided in a screw head and increases the durability of the ring valve. It is an object of the present invention to provide a screw head device of an injection molding machine capable of performing the above.
【０００７】[0007]
【課題を解決するための手段及び実施の形態】本発明は
スクリュヘッド軸部２に、リングバルブ３を前後にスラ
イド自在に装填し、かつリングバルブ３の内周面とスク
リュヘッド軸部２間に後側樹脂通路Ｒｒを確保するとと
もに、スクリュヘッド頭部４に、後側樹脂通路Ｒｒに連
通する前側樹脂通路Ｒｆを軸方向に形成し、かつリング
バルブ３の後方におけるスクリュ本体Ｓｍの前端を弁座
に形成した樹脂の逆流防止機構５を備える射出成形機の
スクリュヘッド装置１を構成するに際して、スクリュヘ
ッド頭部４の後部に、リングバルブ３の前方に位置して
当該リングバルブ３の減耗を防止するボロン合金素材で
一体成形した前リングスペーサ７を回動自在に装填する
とともに、当該前リングスペーサ７を装填するスクリュ
ヘッド頭部４の後部に、外郭面６ｓが、当該スクリュヘ
ッド頭部４の外郭部４ｓと前側樹脂通路Ｒｆの底部Ｒｆ
ｄの中間に位置し、前リングスペーサ７が最後方位置ま
で変位しても外れない長さに選定したスペーサガイド部
６を設けてなることを特徴とする。According to the present invention, a ring valve 3 is mounted on a screw head shaft 2 so as to be slidable back and forth, and a space between an inner peripheral surface of the ring valve 3 and the screw head shaft 2 is provided. A front resin passage Rf communicating with the rear resin passage Rr is formed in the screw head 4 in the axial direction, and a front end of the screw main body Sm behind the ring valve 3 is formed. When configuring the screw head device 1 of the injection molding machine including the resin backflow prevention mechanism 5 formed on the valve seat, the wear of the ring valve 3 is located at the rear of the screw head head 4 in front of the ring valve 3. A front ring spacer 7 integrally formed of a boron alloy material for preventing the rotation is loaded rotatably, and a screw head head 4 for loading the front ring spacer 7 is provided. , The outer surface 6s is, bottom Rf of the outer portion 4s and the front resin passage Rf of the screw head head 4
The spacer guide portion 6 which is located in the middle of the position d and has a length selected so as not to come off even when the front ring spacer 7 is displaced to the rearmost position is provided.
【０００８】この場合、好適な実施の形態により、ボロ
ン合金素材は鉄基複硼化物系焼結合金を用いることが望
ましい。一方、リングバルブ３も、ボロン合金素材、望
ましくは鉄基複硼化物系焼結合金を用いて一体成形でき
るとともに、スクリュヘッド頭部４とスクリュヘッド軸
部２も、ボロン合金素材、望ましくは鉄基複硼化物系焼
結合金を用いて一体成形できる。さらに、スクリュ本体
Ｓｍの前端には、前後端面８ｆ，８ｒを平面形成し、か
つボロン合金素材、望ましくは鉄基複硼化物系焼結合金
で一体成形した後リングスペーサ８を取付けることがで
きる。In this case, according to a preferred embodiment, it is desirable to use an iron-based double boride-based sintered alloy as the boron alloy material. On the other hand, the ring valve 3 can be integrally formed using a boron alloy material, preferably an iron-based double boride-based sintered alloy, and the screw head head 4 and the screw head shaft 2 are also formed of a boron alloy material, preferably iron. It can be integrally formed using a base double boride-based sintered alloy. Further, the ring spacer 8 can be attached to the front end of the screw body Sm after the front and rear end faces 8f and 8r are formed in a plane and formed integrally with a boron alloy material, preferably an iron-based double boride-based sintered alloy.
【０００９】これにより、計量時には、スクリュ本体Ｓ
ｍの回転により樹脂が可塑化される。また、可塑化され
た樹脂は、前方に移動するため、リングバルブ３を前方
へ変位させる。これにより、リングバルブ３は弁座とな
るスクリュ本体Ｓｍの前端から離間し、リングバルブ３
の内周面とスクリュヘッド軸部２間に設けられた後側樹
脂通路Ｒｒは開放される。この結果、樹脂は後側樹脂通
路Ｒｒ及び前側樹脂通路Ｒｆを通ってスクリュヘッド頭
部４の前方に移動し、計量が行われる。この際、スクリ
ュヘッド頭部４は回転するも、スクリュヘッド頭部４と
リングバルブ３間には、硬質素材であるボロン合金素材
で一体成形した前リングスペーサ７が介在するため、ス
クリュヘッドに前側樹脂通路Ｒｆを設けるタイプであっ
ても、リングバルブ３がスクリュヘッド頭部４の凹凸に
よって減耗することはない。一方、射出時には、スクリ
ュ本体Ｓｍが前進し、スクリュヘッド頭部４の前方に計
量された樹脂が金型に射出充填される。この際、リング
バルブ３は計量された樹脂によって後方に変位せしめら
れ、リングバルブ３の後端がスクリュ本体Ｓｍの前端
（弁座）に当接し、後側樹脂通路Ｒｒが遮断されること
により、後方への樹脂の逆流が阻止される。Thus, at the time of weighing, the screw body S
The resin is plasticized by the rotation of m. Further, the plasticized resin moves forward, so that the ring valve 3 is displaced forward. As a result, the ring valve 3 is separated from the front end of the screw body Sm serving as a valve seat, and the ring valve 3
The rear resin passage Rr provided between the inner circumferential surface of the screw head 2 and the screw head shaft 2 is opened. As a result, the resin moves to the front of the screw head 4 through the rear resin passage Rr and the front resin passage Rf, and is measured. At this time, although the screw head 4 rotates, a front ring spacer 7 integrally formed of a boron alloy material, which is a hard material, is interposed between the screw head 4 and the ring valve 3. Even in the type in which the resin passage Rf is provided, the ring valve 3 does not wear due to the unevenness of the screw head 4. On the other hand, at the time of injection, the screw body Sm moves forward, and the resin measured in front of the screw head head 4 is injected and filled in the mold. At this time, the ring valve 3 is displaced rearward by the measured resin, the rear end of the ring valve 3 abuts on the front end (valve seat) of the screw body Sm, and the rear resin passage Rr is shut off. Backflow of the resin backward is prevented.
【００１０】[0010]
【実施例】次に、本発明に係る好適な実施例を挙げ、図
面に基づき詳細に説明する。Next, preferred embodiments according to the present invention will be described in detail with reference to the drawings.
【００１１】まず、本実施例に係る射出成形機のスクリ
ュヘッド装置１の構成について、図１〜図６を参照して
説明する。First, the configuration of a screw head device 1 of an injection molding machine according to the present embodiment will be described with reference to FIGS.
【００１２】図１において、Ｓは射出成形機における加
熱筒１１の内部に挿入したスクリュを示す。スクリュＳ
はスクリュ本体Ｓｍを備え、このスクリュ本体Ｓｍの前
端に本実施例に係るスクリュヘッド装置１を備える。ス
クリュヘッド装置１は、スクリュヘッドＳｈ、リングバ
ルブ３、前リングスペーサ７及び後リングスペーサ８に
より構成する。In FIG. 1, S indicates a screw inserted into a heating cylinder 11 in an injection molding machine. Screw S
Includes a screw body Sm, and a screw head device 1 according to the present embodiment at a front end of the screw body Sm. The screw head device 1 includes a screw head Sh, a ring valve 3, a front ring spacer 7, and a rear ring spacer 8.
【００１３】スクリュヘッドＳｈは、スクリュヘッド軸
部２とこのスクリュヘッド軸部２の前部に一体形成した
スクリュヘッド頭部４からなり、スクリュヘッドＳｈ
（スクリュヘッド頭部４及びスクリュヘッド軸部２）
は、セラミック素材（Ｓｉ3Ｎ4等）よりも欠けにくい性
質、即ち、靭性を有するボロン合金素材により一体成形
する。ボロン合金素材としては、特に、鉄基複硼化物系
焼結合金が望ましい。鉄基複硼化物系焼結合金は、鉄を
基礎とし、Ｃｒ，Ｍｏ，Ｎｉ，Ｗ等の合金成分を含む硬
質焼結合金であり、高い強度と、耐摩耗性，耐食性，耐
高温酸化性を示す。また、スクリュヘッド頭部４の外周
面には図１及び図２に示す四つの凹溝状の前側樹脂通路
Ｒｆ…を形成する。この場合、各前側樹脂通路Ｒｆ…は
軸方向に平行となり、かつ周方向に等間隔に設けられ
る。また、スクリュヘッド頭部４の後部には、外郭面６
ｓが、スクリュヘッド頭部４の外郭部４ｓよりも内側に
位置し、かつ前側樹脂通路Ｒｆの底部Ｒｆｄよりも外側
に位置するスペーサガイド部６を一体に形成する。この
際、スペーサガイド部６は、前リングスペーサ７が最後
方位置まで変位しても、前リングスペーサ７が外れない
長さに選定する。The screw head Sh is composed of a screw head shaft 2 and a screw head 4 integrally formed at the front of the screw head shaft 2.
(Screw head head 4 and screw head shaft 2)
Is integrally formed from a boron alloy material having a property that is less likely to be chipped than a ceramic material (such as Si 3 N 4 ), that is, a toughness. As the boron alloy material, an iron-based double boride-based sintered alloy is particularly desirable. The iron-based double boride-based sintered alloy is a hard sintered alloy based on iron and containing alloy components such as Cr, Mo, Ni, and W, and has high strength, wear resistance, corrosion resistance, and high-temperature oxidation resistance. Is shown. On the outer peripheral surface of the screw head 4, four concave groove-shaped front resin passages Rf shown in FIGS. 1 and 2 are formed. In this case, the front resin passages Rf are parallel to the axial direction and are provided at equal intervals in the circumferential direction. In addition, the rear surface of the screw head 4 has an outer surface 6.
s is integrally formed with the spacer guide portion 6 located inside the outer shell portion 4s of the screw head head 4 and outside the bottom portion Rfd of the front resin passage Rf. At this time, the spacer guide portion 6 is selected to have such a length that the front ring spacer 7 does not come off even if the front ring spacer 7 is displaced to the rearmost position.
【００１４】一方、リングバルブ３は図１及び図４に示
すように、ボロン合金素材、望ましくは上述した鉄基複
硼化物系焼結合金によりリング状（筒状）に一体成形す
る。この場合、リングバルブ３は、加熱筒１１の内部に
収容した際に、当該リングバルブ３の内周面とスクリュ
ヘッド軸部２間に後側樹脂通路Ｒｒが確保されるよう
に、内外径寸法を選定する。また、リングバルブ３は外
周面に段差部１２を設け、スクリュヘッド頭部４側を小
径にする。なお、リングバルブ３の外周面は全て同径に
形成し、段差部１２を設けなくてもよい。On the other hand, as shown in FIGS. 1 and 4, the ring valve 3 is integrally formed in a ring shape (cylindrical shape) from a boron alloy material, preferably the above-mentioned iron-based double boride-based sintered alloy. In this case, the ring valve 3 has inner and outer diameters such that a rear resin passage Rr is secured between the inner peripheral surface of the ring valve 3 and the screw head shaft portion 2 when housed inside the heating cylinder 11. Is selected. Further, the ring valve 3 is provided with a step portion 12 on the outer peripheral surface to reduce the diameter of the screw head head 4 side. The entire outer peripheral surface of the ring valve 3 may be formed to have the same diameter, and the step 12 may not be provided.
【００１５】他方、前リングスペーサ７は図１〜図３に
示すように、前後端面７ｆ，７ｒを平面形成した単純な
リング状（筒状）に形成する。この場合、前リングスペ
ーサ７は、全体を、ボロン合金素材、望ましくは上述し
た鉄基複硼化物系焼結合金により一体成形する。On the other hand, as shown in FIGS. 1 to 3, the front ring spacer 7 is formed in a simple ring shape (tubular shape) having front and rear end surfaces 7f and 7r formed in a plane. In this case, the entire front ring spacer 7 is integrally formed of a boron alloy material, preferably, the above-mentioned iron-based double boride-based sintered alloy.
【００１６】また、後リングスペーサ８は図１及び図５
に示すように、前後端面８ｆ，８ｒを平面形成した単純
なリング状に形成する。この場合、後リングスペーサ８
も前リングスペーサ７と同様に、全体を、ボロン合金素
材、望ましくは上述した鉄基複硼化物系焼結合金により
一体成形する。The rear ring spacer 8 is shown in FIGS.
As shown in the figure, the front and rear end faces 8f and 8r are formed in a simple ring shape with a flat surface. In this case, the rear ring spacer 8
Similarly to the front ring spacer 7, the whole is integrally formed of a boron alloy material, preferably, the above-mentioned iron-based double boride-based sintered alloy.
【００１７】よって、図１に示すように、前リングスペ
ーサ７，リングバルブ３及び後リングスペーサ８に、ス
クリュヘッド軸部２を挿通し、スクリュヘッド軸部２の
後部をスクリュ本体Ｓｍの前端に装着すれば、後リング
スペーサ８はスクリュヘッド軸部２の段差部２ｓにより
スクリュ本体Ｓｍの前端に固定される。また、リングバ
ルブ３は前後にスライド自在に装填されるとともに、リ
ングバルブ３の内周面とスクリュヘッド軸部２間には後
側樹脂通路Ｒｒが確保される。さらにまた、スペーサガ
イド部６に前リングスペーサ７が装填される。これによ
り、逆流防止機構５を備えるスクリュヘッド装置１が構
成される。Therefore, as shown in FIG. 1, the screw head shaft portion 2 is inserted into the front ring spacer 7, the ring valve 3, and the rear ring spacer 8, and the rear portion of the screw head shaft portion 2 is placed at the front end of the screw body Sm. When mounted, the rear ring spacer 8 is fixed to the front end of the screw body Sm by the step 2s of the screw head shaft 2. The ring valve 3 is slidably mounted back and forth, and a rear resin passage Rr is secured between the inner peripheral surface of the ring valve 3 and the screw head shaft 2. Furthermore, the front ring spacer 7 is loaded in the spacer guide portion 6. Thus, the screw head device 1 including the backflow prevention mechanism 5 is configured.
【００１８】次に、本実施例に係るスクリュヘッド装置
１の機能について、図１及び図６を参照して説明する。Next, the function of the screw head device 1 according to the present embodiment will be described with reference to FIGS.
【００１９】まず、計量時には、スクリュ本体Ｓｍの回
転により樹脂が可塑化されるため、可塑化された樹脂は
前方に移動し、図１に示すように、リングバルブ３を前
方へ変位させる。これにより、リングバルブ３は、弁座
となる後リングスペーサ８から離間し、後側樹脂通路Ｒ
ｒが開放される。よって、樹脂は矢印Ｗで示すように、
後側樹脂通路Ｒｒ及び前側樹脂通路Ｒｆを通ってスクリ
ュヘッド頭部４の前方に移動し、計量が行われる。First, at the time of measurement, the resin is plasticized by the rotation of the screw main body Sm, so that the plasticized resin moves forward and displaces the ring valve 3 forward as shown in FIG. As a result, the ring valve 3 is separated from the rear ring spacer 8 serving as a valve seat, and the rear resin passage R is formed.
r is released. Therefore, as indicated by arrow W,
It moves to the front of the screw head head 4 through the rear resin passage Rr and the front resin passage Rf, and is weighed.
【００２０】この際、スクリュヘッド頭部４は回転する
も、スクリュヘッド頭部４，スクリュヘッド軸部２，リ
ングバルブ３，前リングスペーサ７，後リングスペーサ
８は、それぞれ硬質素材であるボロン合金素材（鉄基複
硼化物系焼結合金）により一体成形するため、スクリュ
ヘッドに前側樹脂通路Ｒｆを設けるタイプであっても、
リングバルブ３をはじめ、樹脂通路を形成する重要構成
部品における各接触部分の減耗が有効に回避される。At this time, the screw head 4 rotates, but the screw head 4, screw shaft 2, ring valve 3, front ring spacer 7, and rear ring spacer 8 are each made of a hard material such as boron alloy. Since it is integrally formed from a material (iron-based double boride-based sintered alloy), even if a screw head is provided with a front resin passage Rf,
The wear of each contact portion of the ring valve 3 and other important components forming the resin passage is effectively avoided.
【００２１】一方、射出時には、スクリュ本体Ｓｍが前
進し、スクリュヘッド頭部４の前方に計量された樹脂が
金型に射出充填される。この際、図６に示すように、リ
ングバルブ３は計量された樹脂によって後方に変位せし
められ、リングバルブ３の後端が弁座として機能する後
リングスペーサ８の前端面８ｆに当接し、後側樹脂通路
Ｒｒが遮断される。これにより、後方への樹脂の逆流が
阻止される。On the other hand, at the time of injection, the screw main body Sm advances, and the resin measured in front of the screw head head 4 is injected and filled in the mold. At this time, as shown in FIG. 6, the ring valve 3 is displaced rearward by the measured resin, and the rear end of the ring valve 3 contacts the front end face 8f of the rear ring spacer 8 functioning as a valve seat. The side resin passage Rr is shut off. As a result, backflow of the resin backward is prevented.
【００２２】以上、実施例について詳細に説明したが、
本発明はこのような実施例に限定されるものではない。
例えば、後リングスペーサは必要により設けることがで
きるものであり、必ずしも設けることを要しない。その
他、細部の構成、形状、素材、数量等において、本発明
の要旨を逸脱しない範囲で任意に変更できる。The embodiment has been described in detail above.
The present invention is not limited to such an embodiment.
For example, the rear ring spacer can be provided as needed, and is not necessarily provided. In addition, the configuration, shape, material, quantity, and the like of the details can be arbitrarily changed without departing from the gist of the present invention.
【００２３】[0023]
【発明の効果】このように、本発明に係る射出成形機の
スクリュヘッド装置は、スクリュヘッド頭部の後部に、
リングバルブの前方に位置して当該リングバルブの減耗
を防止するボロン合金素材で一体成形した前リングスペ
ーサを回動自在に装填するとともに、当該前リングスペ
ーサを装填するスクリュヘッド頭部の後部に、外郭面
が、当該スクリュヘッド頭部の外郭部と前側樹脂通路の
底部の中間に位置し、前リングスペーサが最後方位置ま
で変位しても外れない長さに選定したスペーサガイド部
を設けてなるため、次のような顕著な効果を奏する。As described above, the screw head device of the injection molding machine according to the present invention has
A front ring spacer integrally formed of a boron alloy material which is located in front of the ring valve and prevents wear of the ring valve is rotatably loaded, and at the rear of a screw head head for loading the front ring spacer, The outer shell surface is located between the outer shell portion of the screw head and the bottom of the front resin passage, and a spacer guide portion selected to have a length that does not come off even if the front ring spacer is displaced to the rearmost position is provided. Therefore, the following remarkable effects are obtained.
【００２４】 スクリュヘッドに前側樹脂通路を設け
るタイプにおけるリングバルブの減耗を確実に防止し、
もって、リングバルブの耐久性を飛躍的に高めることが
できる。特に、前リングスペーサは、全体を、セラミッ
ク素材よりも欠けにくい、即ち、靭性を有するボロン合
金素材，望ましくは鉄基複硼化物系焼結合金により一体
成形するため、本発明構造においてリングバルブの減耗
を防止する素材として最適である。In a type in which a front resin passage is provided in a screw head, wear of a ring valve is reliably prevented,
Thus, the durability of the ring valve can be dramatically improved. In particular, the entire front ring spacer is less likely to be chipped than the ceramic material, that is, is integrally formed of a tough boron alloy material, preferably an iron-based double boride-based sintered alloy. Ideal as a material to prevent wear.
【００２５】 好適な実施の形態により、さらに、ス
クリュヘッド頭部及びスクリュヘッド軸部，リングバル
ブ，後リングスペーサの一又は二以上を、ボロン合金素
材，望ましくは鉄基複硼化物系焼結合金によりそれぞれ
一体成形すれば、リングバルブのみならず、樹脂通路を
形成する重要構成部品における各摺接部分の減耗が有効
に回避される。According to a preferred embodiment, one or more screw heads and screw head shafts, ring valves, and rear ring spacers are further formed of a boron alloy material, preferably an iron-based double boride-based sintered alloy. Therefore, the wear of not only the ring valve but also the sliding parts of the important components forming the resin passage can be effectively avoided.
【図１】本発明に係るスクリュヘッド装置のリングバル
ブが前方に変位した状態における断面側面図、FIG. 1 is a sectional side view of a screw head device according to the present invention in a state where a ring valve is displaced forward;
【図２】図６中Ａ−Ａ線断面図、FIG. 2 is a sectional view taken along line AA in FIG.
【図３】同スクリュヘッド装置における前リングスペー
サの斜視図、FIG. 3 is a perspective view of a front ring spacer in the screw head device.
【図４】同スクリュヘッド装置におけるリングバルブの
正面図、FIG. 4 is a front view of a ring valve in the screw head device.
【図５】同スクリュヘッド装置における後リングスペー
サの斜視図、FIG. 5 is a perspective view of a rear ring spacer in the screw head device.
【図６】同スクリュヘッド装置のリングバルブが後方に
変位した状態における断面側面図、FIG. 6 is a cross-sectional side view of the screw head device in a state where a ring valve is displaced rearward.
１ スクリュヘッド装置 ２ スクリュヘッド軸部 ３ リングバルブ ４ スクリュヘッド頭部 ４ｓ 外郭部 ５ 逆流防止機構 ６ スペーサガイド部 ６ｓ 外郭面 ７ 前リングスペーサ ８ 後リングスペーサ ８ｆ 前端面 ８ｒ 後端面 Ｒｒ 後側樹脂通路 Ｒｆ 前側樹脂通路 Ｒｆｄ 底部 Ｓｍ スクリュ本体 REFERENCE SIGNS LIST 1 screw head device 2 screw head shaft portion 3 ring valve 4 screw head head 4 s outer surface 5 backflow prevention mechanism 6 spacer guide 6 s outer surface 7 front ring spacer 8 rear ring spacer 8 f front end surface 8 r rear end surface Rr rear resin passage Rf Front resin passage Rfd Bottom Sm Screw body
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宮川 正英 長野県埴科郡坂城町大字南条2110番地 日 精樹脂工業株式会社内 Ｆターム(参考） 4F206 AJ02 JA07 JD03 JL02 JQ14 JQ26 JQ27 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masahide Miyagawa 2110 Nanjo, Najo, Hanashi-gun, Nagano-gun, Japan F-term (reference) in Nissei Jushi Kogyo Co., Ltd. 4F206 AJ02 JA07 JD03 JL02 JQ14 JQ26 JQ27
Claims (8)
前後にスライド自在に装填し、かつリングバルブの内周
面とスクリュヘッド軸部間に後側樹脂通路を確保すると
ともに、スクリュヘッド頭部に、後側樹脂通路に連通す
る前側樹脂通路を軸方向に形成し、かつリングバルブの
後方におけるスクリュ本体の前端を弁座に形成した樹脂
の逆流防止機構を備える射出成形機のスクリュヘッド装
置において、前記スクリュヘッド頭部の後部に、前記リ
ングバルブの前方に位置して当該リングバルブの減耗を
防止するボロン合金素材で一体成形した前リングスペー
サを回動自在に装填するとともに、当該前リングスペー
サを装填する前記スクリュヘッド頭部の後部に、外郭面
が、当該スクリュヘッド頭部の外郭部と前記前側樹脂通
路の底部の中間に位置し、前記前リングスペーサが最後
方位置まで変位しても外れない長さに選定したスペーサ
ガイド部を設けてなることを特徴とする射出成形機のス
クリュヘッド装置。1. A ring valve is slidably mounted on a screw head shaft part back and forth, and a rear resin passage is secured between an inner peripheral surface of the ring valve and the screw head shaft part. A screw head device of an injection molding machine having a resin backflow prevention mechanism in which a front resin passage communicating with a rear resin passage is formed in an axial direction, and a front end of a screw body behind a ring valve is formed in a valve seat. At the rear of the screw head, a front ring spacer integrally formed of a boron alloy material, which is located in front of the ring valve and prevents wear of the ring valve, is rotatably mounted, and the front ring spacer is attached. At the rear of the head of the screw head to be loaded, the outer surface is located between the outer part of the head of the screw head and the bottom of the front resin passage. A screw head device for an injection molding machine, comprising: a spacer guide portion having a length that is set so that the spacer ring does not come off even if the front ring spacer is displaced to the rearmost position.
焼結合金を用いることを特徴とする請求項１記載の射出
成形機のスクリュヘッド装置。2. The screw head device for an injection molding machine according to claim 1, wherein said boron alloy material is an iron-based double boride-based sintered alloy.
一体成形することを特徴とする請求項１記載の射出成形
機のスクリュヘッド装置。3. The screw head device for an injection molding machine according to claim 1, wherein said ring valve is integrally formed of a boron alloy material.
焼結合金を用いることを特徴とする請求項３記載の射出
成形機のスクリュヘッド装置。4. The screw head device for an injection molding machine according to claim 3, wherein said boron alloy material is an iron-based double boride-based sintered alloy.
ヘッド軸部は、ボロン合金素材で一体成形することを特
徴とする請求項１記載の射出成形機のスクリュヘッド装
置。5. A screw head device for an injection molding machine according to claim 1, wherein said screw head head and said screw head shaft are integrally formed of a boron alloy material.
焼結合金を用いることを特徴とする請求項５記載の射出
成形機のスクリュヘッド装置。6. The screw head device for an injection molding machine according to claim 5, wherein said boron alloy material is an iron-based double boride-based sintered alloy.
平面形成し、かつボロン合金素材で一体成形した後リン
グスペーサを取付けてなることを特徴とする請求項１記
載の射出成形機のスクリュヘッド装置。7. A screw head for an injection molding machine according to claim 1, wherein a front and rear end face is formed flat on a front end of said screw main body, and a ring spacer is attached after integrally forming with a boron alloy material. apparatus.
焼結合金を用いることを特徴とする請求項７記載の射出
成形機のスクリュヘッド装置。8. The screw head device for an injection molding machine according to claim 7, wherein said boron alloy material is an iron-based double boride-based sintered alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27068599A JP3786804B2 (en) | 1999-09-24 | 1999-09-24 | Screw head device for injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27068599A JP3786804B2 (en) | 1999-09-24 | 1999-09-24 | Screw head device for injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001088179A true JP2001088179A (en) | 2001-04-03 |
| JP3786804B2 JP3786804B2 (en) | 2006-06-14 |
Family
ID=17489533
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27068599A Expired - Fee Related JP3786804B2 (en) | 1999-09-24 | 1999-09-24 | Screw head device for injection molding machine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10241262A1 (en) * | 2002-09-06 | 2004-03-18 | Dr. Boy Gmbh & Co. Kg | Injection molding machine screw head has non-return valve with movable barrier ring comprising rotatable segments |
| JP2008223907A (en) * | 2007-03-13 | 2008-09-25 | National Institute Of Advanced Industrial & Technology | Back pressure regulating valve |
| CN102729423A (en) * | 2012-06-20 | 2012-10-17 | 无锡天惠塑机有限公司 | Plasticizing part of injection molding machine |
| WO2020238755A1 (en) * | 2019-05-31 | 2020-12-03 | 徐锡东 | Screw check ring mechanism for injection molding machine |
-
1999
- 1999-09-24 JP JP27068599A patent/JP3786804B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10241262A1 (en) * | 2002-09-06 | 2004-03-18 | Dr. Boy Gmbh & Co. Kg | Injection molding machine screw head has non-return valve with movable barrier ring comprising rotatable segments |
| DE10241262B4 (en) * | 2002-09-06 | 2005-11-24 | Dr. Boy Gmbh & Co. Kg | Screw head with backflow stop |
| JP2008223907A (en) * | 2007-03-13 | 2008-09-25 | National Institute Of Advanced Industrial & Technology | Back pressure regulating valve |
| CN102729423A (en) * | 2012-06-20 | 2012-10-17 | 无锡天惠塑机有限公司 | Plasticizing part of injection molding machine |
| WO2020238755A1 (en) * | 2019-05-31 | 2020-12-03 | 徐锡东 | Screw check ring mechanism for injection molding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3786804B2 (en) | 2006-06-14 |
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