JPH02169219A - Injection molding shut-off valve - Google Patents
Injection molding shut-off valveInfo
- Publication number
- JPH02169219A JPH02169219A JP32514088A JP32514088A JPH02169219A JP H02169219 A JPH02169219 A JP H02169219A JP 32514088 A JP32514088 A JP 32514088A JP 32514088 A JP32514088 A JP 32514088A JP H02169219 A JPH02169219 A JP H02169219A
- Authority
- JP
- Japan
- Prior art keywords
- injection
- raw material
- plunger
- pressure
- mold
- 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
- 238000001746 injection moulding Methods 0.000 title claims description 13
- 238000002347 injection Methods 0.000 claims abstract description 69
- 239000007924 injection Substances 0.000 claims abstract description 69
- 239000002994 raw material Substances 0.000 claims abstract description 55
- 238000001816 cooling Methods 0.000 abstract description 12
- 239000012768 molten material Substances 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 238000007711 solidification Methods 0.000 description 7
- 230000008023 solidification Effects 0.000 description 7
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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
- B29C45/20—Injection nozzles
- B29C45/23—Feed stopping equipment
- B29C45/231—Needle valve systems therefor
-
- 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
- B29C45/57—Exerting after-pressure on the moulding material
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は射出成形において用いられる射出成形用遮断
弁に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to an injection molding shutoff valve used in injection molding.
（従来の技術）
従来、熱可塑性樹脂を原料とする射出成形は、溶融した
原料の計量、溶融原料の射出、射出圧力の保持下で製品
の冷却固化、成形製品の取出しの工程が繰り返し行なわ
れ、製品が連続的に製造されている。このような成形を
行う射出成形機は成形型と射出機構部をつなぐ溶融原料
の注入通路に射出ノズルと、注入通路を遮断する為の遮
断弁を設けた構造が一般的となっている。(Prior art) Conventionally, injection molding using thermoplastic resin as a raw material involves repeating the steps of measuring the molten raw material, injecting the molten raw material, cooling and solidifying the product while maintaining the injection pressure, and removing the molded product. , the product is manufactured continuously. Injection molding machines that perform such molding generally have a structure in which an injection nozzle and a shutoff valve for shutting off the injection passage are provided in the injection passage for molten raw material that connects the mold and the injection mechanism.
前記遮断弁は、射出圧力の保持の工程が完了して、次の
サイクルの原料の計量および前のサイクルの製品の取出
し時に閉じるようにしており、注入した原料の冷却同化
時には開として射出機構部側からの圧力を成形型内に加
えられるようにしている。The shutoff valve is closed when the process of maintaining the injection pressure is completed and the next cycle's raw material is measured and the product of the previous cycle is taken out, and is opened when the injected raw material is cooled and assimilated to close the injection mechanism. This allows pressure to be applied from the side into the mold.
（発明が解決しようとする課題）
１サイクルの射出成形時間を短縮する為に、前記遮断弁
を溶融原料の射出後直ちに閉じて、次サイクルの為の溶
融原料の計量を開始すると、成形型内で冷却固化中の製
品は射出圧力の保持がされないので、原料の冷却同化に
よる収縮で製品の寸法や形状が不安定となったり、いわ
ゆる「ヒケＪが発生する問題があり、この為、製造能率
の向上が難しかった。(Problem to be Solved by the Invention) In order to shorten the injection molding time for one cycle, when the shutoff valve is closed immediately after the injection of the molten raw material and the measurement of the molten raw material for the next cycle is started, the inside of the mold is Since the injection pressure of the product is not maintained during cooling and solidification, the dimensions and shape of the product may become unstable due to shrinkage due to cooling and assimilation of the raw material, and so-called "sink marks" may occur, resulting in a reduction in manufacturing efficiency. It was difficult to improve.
（課題を解決する為の手段）
そこでこの発明は、前記冷却固化の工程において、溶融
原料の注入通路を遮断し、かつ注入した溶融原料の圧力
保持ができるようにして、いわゆる「ヒケ」の発生を防
止すると共に、寸法や形状を一定にできるようにしたの
である。(Means for Solving the Problems) Therefore, the present invention is designed to block the injection path for the molten raw material in the cooling and solidification process, and to maintain the pressure of the injected molten raw material, thereby preventing the occurrence of so-called "sink marks". In addition to preventing this, it also made it possible to keep the dimensions and shape constant.
即ち、この発明の射出成形用遮断弁は、射出機構部より
成形型内製品部分に至る溶融原料の注入通路に介装され
た遮断弁であって、溶融原料の注入通路を遮断する為の
プランジャーが注入通路内に進退可能に設けてあり、該
プランジャーの前進方向通路内にはプランジャーと密嵌
する圧力室が形成してあることを特徴としている。That is, the injection molding shutoff valve of the present invention is a shutoff valve that is interposed in the injection passage for molten raw material from the injection mechanism section to the product part in the mold, and has a plan for shutting off the injection passage for the molten raw material. A plunger is provided in the injection passage so as to be movable back and forth, and a pressure chamber is formed in the passage in the forward direction of the plunger, which tightly fits the plunger.
前記射出機構部は、計量供給された熱可塑性樹脂でなる
原料を、加熱によって可塑化すると共に、ノズルを通し
て成形型へ射出する部分であって、加熱筒内に射出スク
リューや射出プランジャーを内装した構造である。The injection mechanism part is a part that plasticizes the metered and supplied raw material made of thermoplastic resin by heating and injects it into the mold through a nozzle, and has an injection screw and an injection plunger inside the heating cylinder. It is a structure.
一方、前記圧力室は、溶融原料の遮断の為に設けたプラ
ンジャーの後退時に、該プランジャーの前方に真空部が
形成されないようにする為、内側壁に原料溜用シリンダ
ーを設けるのが望ましい。On the other hand, in order to prevent a vacuum from being formed in front of the plunger provided to shut off the molten raw material when the plunger is retracted, it is preferable that the pressure chamber is provided with a raw material reservoir cylinder on the inner wall thereof. .
（作 用）
この発明の射出成形用遮断弁によれば、プランジャーを
前進させて圧力室に嵌入させることによって、溶融原料
の注入通路の遮断ができると共に、成形型に注入した溶
融原料の注入圧力を保持することができる。(Function) According to the injection molding shutoff valve of the present invention, by advancing the plunger and fitting it into the pressure chamber, it is possible to shut off the injection passage for the molten raw material, and also to inject the molten raw material injected into the mold. Can hold pressure.
（実施例）
以下、この発明の実施例について図面を参照して説明す
る。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
第１図は熱可塑性樹脂を溶融する加熱筒に実施した例を
表わしたもので、１が加圧筒でありで、前端部（図中左
側）に射出ノズル２が形成されていると共に、後端部に
射出機構部を構成する射出スクリュー３が内装されてい
る。Figure 1 shows an example of a heating cylinder for melting thermoplastic resin, in which numeral 1 is a pressurizing cylinder, an injection nozzle 2 is formed at the front end (left side in the figure), and an injection nozzle 2 is formed at the rear end. An injection screw 3 constituting an injection mechanism section is installed at the end.
前記射出ノズルと射出スクリュー３の間にはトービド４
が配置され、該トービド４の外壁と加熱筒１の内壁の間
を溶融原料の注入通路５としである。そして、前記トー
ビド４の前端側にプランジャー６が摺動自在に設置しで
あると共に、トービド４の前方には、前記プランジャー
６と密嵌する圧力室７が形成しである。A tovide 4 is provided between the injection nozzle and the injection screw 3.
is arranged between the outer wall of the tovide 4 and the inner wall of the heating cylinder 1 as an injection passage 5 for the molten raw material. A plunger 6 is slidably installed on the front end side of the tovide 4, and a pressure chamber 7 that fits tightly into the plunger 6 is formed in front of the tovide 4.
前記プランジャー６の摺動は、該プランジャー６の後端
に連設したピストン８とトービド４内に形成した空洞９
で流体圧シリンダーを構成し、ピストン８の前方および
後方へ加圧油又は加圧空気を給排させて行うようになっ
ており、プランジャー６を射出ノズル２側へ前進させた
り、或いは後退できるようになっている。尚、この摺動
の為の機構は機械的な構造としても良いし、又、加熱筒
１の外部に設けて、プランジャー６とリンク機構などに
より連結するようにしても良い。The sliding movement of the plunger 6 is caused by a piston 8 connected to the rear end of the plunger 6 and a cavity 9 formed in the tovide 4.
This constitutes a fluid pressure cylinder, and pressurized oil or pressurized air is supplied and discharged to the front and rear of the piston 8, and the plunger 6 can be advanced toward the injection nozzle 2 or retreated. It looks like this. The sliding mechanism may be a mechanical structure, or may be provided outside the heating cylinder 1 and connected to the plunger 6 by a link mechanism or the like.
圧力室７の内側壁には、放射方向に複数の穴による原料
溜用シリンダー１０．１０が形成してあり、該シリンダ
ー１０，１０にピストン１１．１１が摺動可能に嵌装さ
れている。ピストン１１に連結したピストンロッド１２
は圧力室７の側壁を貫通して外部に突出させてあり、ス
プリング（図示していない）などの調整手段に連結され
て、圧力室７内が陽圧の際にはピストン１１が後退（外
方に移動）し、負圧の際にはピストン１１が圧力室７側
へ前進できるようになっている。前記加熱筒１の周囲に
はヒータ１３．１３が装着されている。In the inner wall of the pressure chamber 7, a raw material reservoir cylinder 10.10 is formed with a plurality of holes in the radial direction, into which a piston 11.11 is slidably fitted. Piston rod 12 connected to piston 11
penetrates the side wall of the pressure chamber 7 and protrudes to the outside, and is connected to an adjusting means such as a spring (not shown), so that when the pressure chamber 7 is under positive pressure, the piston 11 is moved back (outward). When the pressure is negative, the piston 11 can move forward toward the pressure chamber 7. A heater 13.13 is installed around the heating cylinder 1.
上記実施例の射出成形用遮断弁を使用した射出成形の工
程を説明すると次の通りである。The injection molding process using the injection molding shutoff valve of the above embodiment will be explained as follows.
射出スクリュー３は、矢示１４の方向へ前進させると、
溶融原料溜１５に計量された溶融原料がノズル２を通し
て射出される一方、射出スクリュー３を回転させなから
矢示１４と逆の方向へ後退させると、加熱筒１内後方（
図中右方）で溶融した原料が計量されて溶融原料溜１５
へ供給されるようになっている。When the injection screw 3 is advanced in the direction of arrow 14,
While the molten raw material metered into the molten raw material reservoir 15 is injected through the nozzle 2, when the injection screw 3 is moved back in the direction opposite to the arrow 14 without rotating, the molten raw material is injected into the heating cylinder 1 at the rear (
The melted raw material is measured in the molten raw material reservoir 15 (on the right side of the figure).
It is designed to be supplied to
然して、計量された所定量の溶融原料が溶融原料溜１５
内へ供給されたならば、射出スクリュー３を矢示１４の
方向へ前進させる。これによって溶融した原料が注入通
路５、圧力室７を通して射出ノズル２より成形型（図示
していない）へ射出される。Thus, a predetermined amount of the measured molten raw material is transferred to the molten raw material reservoir 15.
Once the injection screw 3 is supplied inside, the injection screw 3 is advanced in the direction of the arrow 14. As a result, the molten raw material is injected from the injection nozzle 2 through the injection passage 5 and the pressure chamber 7 into a mold (not shown).
所定量の原料の射出が完了したら、前記プランジャー６
を射出ノズル２側へ前進させて、該プランジャー６を圧
力室７内へ嵌入させることにより、注入通路５を遮断し
、成形型内の原料が冷却固化するのに必要な時間光、こ
の状態を維持する。プランジャー６は前進方向へ圧力を
かけて、注入した溶融原料の圧力を保持し、冷却固化時
の収縮を補うようにする。尚、プランジャー６による加
圧は、注入圧力の保持にとどまることなく、注入圧力以
上の圧力とすることもできる。When the injection of a predetermined amount of raw material is completed, the plunger 6
By advancing the plunger 6 toward the injection nozzle 2 side and fitting the plunger 6 into the pressure chamber 7, the injection passage 5 is blocked and the light is kept in this state for a period of time necessary for the raw material in the mold to cool and solidify. maintain. The plunger 6 applies pressure in the forward direction to maintain the pressure of the injected molten raw material and compensate for shrinkage during cooling and solidification. Note that the pressurization by the plunger 6 is not limited to maintaining the injection pressure, but can also be applied to a pressure higher than the injection pressure.
一方、プランジャー６の前進によって、注入通路５を遮
断したならば、射出スクリュー３を回転させながら後退
させて、次の射出に必要な溶融原料の計量供給を開始し
、次のサイクルの準備をする。On the other hand, once the injection passage 5 is blocked by advancing the plunger 6, the injection screw 3 is rotated and retreated to start metering and supplying the molten raw material necessary for the next injection, and prepare for the next cycle. do.
成形型内における冷却固化が完了したならば、成形品の
取出しを行うと共に、プランジャー６を後退させて、圧
力保持を解くと共に、遮断した注入通路５を連通させる
。When cooling and solidification in the mold is completed, the molded product is taken out, the plunger 6 is moved back, the pressure is released, and the blocked injection passage 5 is opened.
以下、前記射出スクリュー３の前進による溶融原料の射
出へと移行し、同一工程を繰り返す。Thereafter, the injection screw 3 moves forward to inject the molten raw material, and the same process is repeated.
尚、プランジャー６の後退時に、圧力室７内が負圧とな
る場合がある。この場合には、側壁に設けた原料溜用シ
リンダー１０．１０内のピストン１１．１１が圧力室７
側へ前進して、原料溜用シリンダー１０内の原料を圧力
室７側へ戻して、プランジャー６の前方に真空部分が形
成されないようにすることができる。Note that when the plunger 6 retreats, the pressure inside the pressure chamber 7 may become negative. In this case, the piston 11.11 in the raw material reservoir cylinder 10.10 provided on the side wall is connected to the pressure chamber 7.
By moving forward to the side, the raw material in the raw material reservoir cylinder 10 can be returned to the pressure chamber 7 side, so that a vacuum portion can be prevented from being formed in front of the plunger 6.
第２図は成形型の内部に実施した例を表わすもので、加
熱筒１は従来型としである。FIG. 2 shows an example in which the heating cylinder 1 is of a conventional type.
成形型１６は対向する二つの型１６ａ、１６ｂで構成さ
れ、対向部に製品部分１７が形成されていると共に、一
方の型１６ｂ内には加熱筒１の射出ノズル２と製品部分
を連通ずる、溶融原料の注入通路１８が設けられている
。The mold 16 is composed of two opposing molds 16a and 16b, and a product portion 17 is formed in the opposing portion, and in one mold 16b, the injection nozzle 2 of the heating cylinder 1 and the product portion are communicated. An injection passage 18 for molten raw material is provided.
前記注入通路１８において、その−側に前記実施例と同
様のプランジャー６が進退可能に設けてあり、プランジ
ャー６の前進方向に、プランジャー６が密嵌する圧力室
７が設けてある。プランジャー６の前進および後退させ
る為のピストンロッド８および空洞９も前記実施例と同
様の構造で設けられている。In the injection passage 18, a plunger 6 similar to that of the embodiment described above is provided on the negative side thereof so as to be movable back and forth, and a pressure chamber 7 in which the plunger 6 is tightly fitted is provided in the forward direction of the plunger 6. A piston rod 8 and a cavity 9 for advancing and retracting the plunger 6 are also provided with the same structure as in the previous embodiment.
この実施例においても、射出スクリュー３の前進によっ
て溶融原料を成形型１６の製品部分１７へ射出した後、
プランジャー６を前進させて圧力室７へ密嵌させると注
入通路１８を遮断すると共に、前記製品部分１７へ注入
した溶融原料の注入圧力を保持することができる。一方
、プランジャー６を前進させて注入通路１８を遮断した
後は、射出スクリュー３の回転および後退により、次サ
イクルの溶融原料の計量を開始することができる。In this embodiment as well, after injecting the molten raw material into the product part 17 of the mold 16 by advancing the injection screw 3,
When the plunger 6 is advanced and tightly fitted into the pressure chamber 7, the injection passage 18 is blocked, and the injection pressure of the molten raw material injected into the product portion 17 can be maintained. On the other hand, after the plunger 6 is advanced to block the injection passage 18, the injection screw 3 is rotated and retreated to start metering the molten raw material for the next cycle.
前記において射出工程に１０秒、射出圧力保持による冷
却固化の工程に５秒、原料の計量に１０秒、製品の取出
しに２秒の時間を要するとすると、−サイクルに２７秒
の時間が必要となるが、冷却固化工程では次のサイクル
の原料の計量を開始できることから、冷却固化工程に必
要な時間５秒を各サイクルにおいて短縮することができ
、約２０％の能率向上を図ることができる。In the above, if the injection process takes 10 seconds, the cooling and solidification process by maintaining the injection pressure takes 5 seconds, the weighing of the raw material takes 10 seconds, and the product take-out takes 2 seconds, the -cycle requires 27 seconds. However, in the cooling solidification process, the measurement of the raw material for the next cycle can be started, so the time required for the cooling solidification process can be shortened by 5 seconds in each cycle, and efficiency can be improved by about 20%.
又、成形型に射出した原料はプランジャー６を介して圧
力保持された状態で冷却固化されるので、収縮による、
いわゆる「ヒケ」の発生を防止することができると共に
、製品の寸法や形状も一定に保つことができる。In addition, since the raw material injected into the mold is cooled and solidified while being kept under pressure via the plunger 6, shrinkage causes
The occurrence of so-called "sink marks" can be prevented, and the dimensions and shape of the product can also be kept constant.
（発明の効果）
以上に説明したように、この発明によれば、射出機構部
より成形型内製品部分に至る溶融原料の注入通路を遮断
すると共に、成形型に注入した溶融原料の圧力を保持で
きるようにしたので、射出した原料の冷却固化を待つこ
となく、次のサイクルの動作を開始でき、製造能率を向
上できる効果がある。又、収縮による「ヒケ」を発生さ
せることなく、一定の寸法および形状で成形を繰り返し
得るので品質を向上できる効果がある。(Effects of the Invention) As explained above, according to the present invention, the injection passage of the molten raw material from the injection mechanism to the product part in the mold is blocked, and the pressure of the molten raw material injected into the mold is maintained. This makes it possible to start the next cycle without waiting for the injected raw material to cool and solidify, which has the effect of improving manufacturing efficiency. Furthermore, since molding can be repeated with a constant size and shape without causing "sink marks" due to shrinkage, quality can be improved.
第１図はこの発明を加熱筒内で実施した例の断面図、第
２図はこの発明を成形型内で実施した例の断面図である
。
１・・・加熱筒 ２・・・射出ノズル３・・
・射出スクリュー ５．１８・・・注入通路６・・・
プランジャー ７・・・圧力室１０・・・原料溜用
シリンダーFIG. 1 is a sectional view of an example in which the invention is implemented within a heating cylinder, and FIG. 2 is a sectional view of an example in which the invention is implemented in a mold. 1... Heating cylinder 2... Injection nozzle 3...
・Injection screw 5.18...Injection passage 6...
Plunger 7...Pressure chamber 10...Cylinder for raw material reservoir
Claims (1)
注入通路に介装された遮断弁であって、溶融原料の注入
通路を遮断する為のプランジャーが注入通路内に進退可
能に設けてあり、該プランジャーの前進方向通路内には
プランジャーと密嵌する圧力室が形成してあることを特
徴とした射出成形用遮断弁 ２ 圧力室は、内側壁に原料溜用シリンダーが設けてあ
る請求項１記載の射出成形用遮断弁[Scope of Claims] 1. A shutoff valve installed in an injection passage for molten raw material leading from an injection mechanism to a product part in a mold, wherein a plunger for shutting off the injection passage for molten raw material is located in the injection passage. A shutoff valve for injection molding 2, characterized in that the injection molding shutoff valve is provided so as to be movable forward and backward, and a pressure chamber is formed in the passage in the forward direction of the plunger to tightly fit the plunger. The injection molding shutoff valve according to claim 1, further comprising a reservoir cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32514088A JPH02169219A (en) | 1988-12-23 | 1988-12-23 | Injection molding shut-off valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32514088A JPH02169219A (en) | 1988-12-23 | 1988-12-23 | Injection molding shut-off valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02169219A true JPH02169219A (en) | 1990-06-29 |
Family
ID=18173505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32514088A Pending JPH02169219A (en) | 1988-12-23 | 1988-12-23 | Injection molding shut-off valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02169219A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002074517A1 (en) * | 2001-03-20 | 2002-09-26 | Karl Hehl | Closable nozzle body and method for closing the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5567434A (en) * | 1978-11-15 | 1980-05-21 | Toshiba Mach Co Ltd | Constant pressure controlling device |
-
1988
- 1988-12-23 JP JP32514088A patent/JPH02169219A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5567434A (en) * | 1978-11-15 | 1980-05-21 | Toshiba Mach Co Ltd | Constant pressure controlling device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002074517A1 (en) * | 2001-03-20 | 2002-09-26 | Karl Hehl | Closable nozzle body and method for closing the same |
| US7040887B2 (en) | 2001-03-20 | 2006-05-09 | Karl Hehl | Closable nozzle body |
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