JPS6030532B2 - injection mold - Google Patents
injection moldInfo
- Publication number
- JPS6030532B2 JPS6030532B2 JP58043758A JP4375883A JPS6030532B2 JP S6030532 B2 JPS6030532 B2 JP S6030532B2 JP 58043758 A JP58043758 A JP 58043758A JP 4375883 A JP4375883 A JP 4375883A JP S6030532 B2 JPS6030532 B2 JP S6030532B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- gate
- movable
- cavity
- movable piece
- 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
- B29C45/38—Cutting-off equipment for sprues or ingates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3044—Bumpers
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は射出成形用金型、さらに詳しくは、最尺成形品
を合成樹脂の射出成形により得るようにしたものにおい
て使用される射出成形用金型に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection mold, and more particularly, to an injection mold for use in producing the longest molded product by injection molding of synthetic resin.
一般に合成樹脂の射出成形は、固定型と可動型とを閉鎖
して形成されるキャビティ内に加熱溶融状態の樹脂をゲ
ートから射出することによって行なわれ、このゲートは
成形品の形状、大きさ等に応じて円形状、環状、或いは
、扇形状等各種形状のものがあることは周知のとおりで
る。Injection molding of synthetic resins is generally performed by injecting heated molten resin into a cavity formed by closing a fixed mold and a movable mold through a gate. As is well known, there are various shapes such as a circular shape, an annular shape, or a fan shape depending on the situation.
近時、成形品の中には例えば自動車用バンパーのような
大型で最尺のものがあり、かかる大型長尺品を合成樹脂
の射出成形により得ようとすれば、従釆ではキャビティ
の長手方向に複数個のゲートを所定間隔置きに設けて複
数個所から溶融樹脂を射出するようにしていたが、その
ようにすると違うゲートから入った溶融樹脂どうしがキ
ャピティ内で出合って融合した際それが成形品の表面部
分にラインとなって表われるため見栄えが悪くなると同
時に強度が弱くなる等の欠点があった。Nowadays, some of the molded products are large and the longest, such as automobile bumpers, and if such large and long products are to be obtained by injection molding of synthetic resin, the longitudinal direction of the cavity must be In the past, multiple gates were installed at predetermined intervals to inject molten resin from multiple locations, but when the molten resin entered from different gates met and fused in the cavity, it would cause molding. Lines appear on the surface of the product, resulting in poor appearance and weak strength.
その対策としてゲートをキャビティの長手方向に沿う長
孔状に形成してその唯一の最孔状ゲート（フィルムゲー
ト）から溶融樹脂を射出することでラインの発生等をな
くすことも考えられるが、．そのようにすると成形品か
らランナを切除するのが容易ではなくなり作業性が悪く
なる欠点があった。本発明は上述に鑑みてなされたもの
で、ゲートをキャビティの長手方向に沿う最孔状に形成
すると共に、該ゲートを開閉する可動片を設けることに
よって、ランナを切除する必要をなくすると同時に成形
品の仕上、品質の向上を図ろうとするものである。As a countermeasure, it may be possible to eliminate lines by forming the gate in the shape of a long hole along the length of the cavity and injecting molten resin from the only hole-shaped gate (film gate). This has the disadvantage that it is not easy to remove the runner from the molded product, resulting in poor workability. The present invention has been made in view of the above, and by forming the gate in the hole shape along the longitudinal direction of the cavity and providing a movable piece for opening and closing the gate, it is possible to eliminate the need to cut out the runner and simultaneously form the mold. The aim is to improve the finish and quality of products.
以下に本発明の一実施例について図面と共に説明する。An embodiment of the present invention will be described below with reference to the drawings.
図において、１は固定型、２は可動型、３は該固定型１
と可動型２とを閉鎖した状態でそのパーティングライン
に形成されたキャビティであり、該キャビティ３はこの
実施例では自動車用バンパーを形作るべく第１図にはそ
の横断面が表わされる。しかして、本発明ではゲート４
を前記キャビティ３の長手方向に沿う長孔状に形成する
。そして、可動型２の外側面に固着した取付部材５にシ
リンダ６を岡設すると共に、固定型１と面する可動型２
の一部に横方向に摺動自在なる可動片７を設け、該可動
片７にシリンダ６のピストンロッド８を固着し、該ピス
トンロッド８の伸縮動により可動片７が可動型２内を摺
動するようにする。可動片７の固定型１との対向面には
溝状のランナ９が穿設されている。ランナ９はゲート４
を介してキャビティ３と蓮適しているが、可動片７が摺
動すると該可動片７の端縁に位置した弁部ｌｏがゲート
４を開閉できるようにしているＯｉｌはスブル１２から
ランナ９に溶融樹脂を供給するため固定形１中に斜めに
形成された通路で、該通路には熔融樹脂が途中で冷却固
化しないようにバンドヒータ１３が巻回されている。１
４は可動片７に固着したブッシュ１５に進退自在に貫挿
したェジェクトロッドで、該ェジェクトロッドの先端は
ランナ９に臨ましせる。In the figure, 1 is a fixed type, 2 is a movable type, and 3 is the fixed type 1.
A cavity 3 is formed at the parting line of the movable mold 2 in a closed state, and the cavity 3 forms a bumper for an automobile in this embodiment, and its cross section is shown in FIG. However, in the present invention, gate 4
is formed in the shape of a long hole along the longitudinal direction of the cavity 3. Then, a cylinder 6 is mounted on the mounting member 5 fixed to the outer surface of the movable mold 2, and the movable mold 2 faces the fixed mold 1.
A movable piece 7 that can freely slide in the lateral direction is provided in a part of the movable piece 7, and a piston rod 8 of the cylinder 6 is fixed to the movable piece 7, so that the movable piece 7 slides inside the movable mold 2 by the expansion and contraction movement of the piston rod 8. make it move. A groove-shaped runner 9 is bored on the surface of the movable piece 7 facing the fixed mold 1. Runner 9 is gate 4
When the movable piece 7 slides, the valve lo located at the edge of the movable piece 7 can open and close the gate 4. Oil flows from the sublug 12 to the runner 9 through the This is a passage formed diagonally in the fixed mold 1 for supplying molten resin, and a band heater 13 is wound around the passage so that the molten resin does not cool and solidify on the way. 1
Reference numeral 4 denotes an eject rod inserted into a bush 15 fixed to the movable piece 7 so that it can move forward and backward, and the tip of the eject rod faces the runner 9.
このように構成した射出成形用金型では、第１図に示し
たように固定型１と可動型２とを合致させた状態にて加
熱溶融状態の合成樹脂を通路１１からランナ９、ゲート
４を通してキャビティ３に射出する。In the injection mold constructed as described above, the fixed mold 1 and the movable mold 2 are aligned with each other as shown in FIG. Inject into cavity 3 through.
ゲート４は最孔状に形成してあるためにキャビティ３内
にて溶融樹脂は分離することなく流入しキャビティ３内
に速やたに充填される。そしてキャビティ３内の合成樹
脂が半溶融状になったところでシリンダ６を作動させ可
動片７を該シリンダ６方向へ牽引動させ弁部１０により
ゲート４を閉鎖し、キャビティ３内の樹脂とラソナ９内
の樹脂とを切離する。次いで、キャビティ３内の樹脂が
完全に冷却固化してら可動型２を固定型１から離して第
２図に示したように成形品１６を取出す。なおランナ９
内にて硬化した樹脂片１７は磯型時に通路１１の出口部
１１′に位置している半溶融状の樹脂を該樹脂片１７に
一体に伴なつて抽出し、該樹脂片１７に錐状部１７′を
形成して一行程毎に該出口部１１′の樹脂が排除される
ようにして該出口部１１′が詰まるのを防いでいる。そ
して該樹脂片１７はェジェクトロッド１４が離型時に突
き出ることによってランナ９から離脱し取り除かれる。
以上実施例について説明したように本発明の射出成形用
金型は、ゲートがキャビティの長手方向に沿う長孔状に
形成してあるので、長尺成形品を得る場合にも射出され
た樹脂がキャビティ内で分離することなく速やかに充填
できるため成形品の表面に見苦しい樹脂の融合ラインを
生じさせることなく品質、強度の秀れた製品が成形でき
る。Since the gate 4 is formed to have the largest hole, the molten resin flows into the cavity 3 without being separated and is quickly filled into the cavity 3. Then, when the synthetic resin in the cavity 3 becomes semi-molten, the cylinder 6 is actuated, the movable piece 7 is pulled in the direction of the cylinder 6, the gate 4 is closed by the valve part 10, and the resin in the cavity 3 and the lasona 9 Separate the resin inside. Next, after the resin in the cavity 3 is completely cooled and solidified, the movable mold 2 is separated from the fixed mold 1 and the molded product 16 is taken out as shown in FIG. Furthermore, runner 9
When the resin piece 17 is hardened inside, the semi-molten resin located at the outlet 11' of the passage 11 is extracted together with the resin piece 17 during the rock molding, and a conical shape is formed in the resin piece 17. A portion 17' is formed so that the resin in the outlet portion 11' is removed every stroke to prevent the outlet portion 11' from becoming clogged. The resin piece 17 is detached from the runner 9 and removed by the eject rod 14 protruding during demolding.
As explained above in the embodiments, in the injection mold of the present invention, the gate is formed in the shape of a long hole along the longitudinal direction of the cavity, so that even when obtaining a long molded product, the injected resin is Because it can be quickly filled into the cavity without separating, products with excellent quality and strength can be molded without creating unsightly resin fusion lines on the surface of the molded product.
また、ゲートを開閉する可動片を設けて成形時にキャビ
ティ内の樹脂とランナ内の樹脂との切離しができるよう
にしたので、成形後にランナを切除する煩雑な作業を行
なわなくてもよくなり成形作業の効率化が図れる利点を
有するものである。In addition, a movable piece that opens and closes the gate allows the resin in the cavity and the resin in the runner to be separated during molding, eliminating the need for the complicated work of cutting out the runner after molding. This has the advantage of increasing efficiency.
第１図は本発明の一実施例を示した金型の縦断面図、第
２図はその作用状態を示した縦断面図である。
１・・・・・・固定型、２・・…・可動型、３・・・・
・・キャビティ、４・・・・・・ゲート、６・・・・・
・シリンダ、７・・・・・・可動片、８……ピストンロ
ッド、９……ランナ、１０・・・・・・弁部、１４・・
・・・・ェジェクトロッド。
第１図図
Ｎ
船FIG. 1 is a vertical sectional view of a mold showing an embodiment of the present invention, and FIG. 2 is a vertical sectional view showing its operating state. 1... Fixed type, 2... Movable type, 3...
...Cavity, 4...Gate, 6...
・Cylinder, 7...Movable piece, 8...Piston rod, 9...Runner, 10...Valve part, 14...
...Eject rod. Figure 1 Figure N Ship
Claims (1)
溶融状態の合成樹脂をゲートを介して射出し、長尺成形
品を射出成形するものにおいて、前記ゲートをキヤビテ
イの長手方向に沿う長孔状に形成すると共に、固定型と
面する可動型の一部に横方向に摺動自在なる可動片を設
け、該可動片にシリンダのピストンロツドを固着し、該
ピストンロツドの伸縮動により可動片が可動型内を摺動
し前記ゲートを開閉させるように構成したことを特徴と
する射出成形用金型。1 In a device that injects synthetic resin in a heated molten state through a gate into a cavity formed by a fixed mold and a movable mold to form a long molded product, the gate is connected to a long hole along the longitudinal direction of the cavity. A part of the movable mold facing the fixed mold is provided with a movable piece that can be slid laterally, a piston rod of the cylinder is fixed to the movable piece, and the movable piece is movable by the expansion and contraction movement of the piston rod. An injection mold, characterized in that it is configured to slide within the mold to open and close the gate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58043758A JPS6030532B2 (en) | 1983-03-15 | 1983-03-15 | injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58043758A JPS6030532B2 (en) | 1983-03-15 | 1983-03-15 | injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59169828A JPS59169828A (en) | 1984-09-25 |
| JPS6030532B2 true JPS6030532B2 (en) | 1985-07-17 |
Family
ID=12672656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58043758A Expired JPS6030532B2 (en) | 1983-03-15 | 1983-03-15 | injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6030532B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63252711A (en) * | 1987-04-10 | 1988-10-19 | Kobayashi Tekkosho:Kk | Molding method for synthetic resin molded product and its device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5935020U (en) * | 1982-08-27 | 1984-03-05 | 東芝機械株式会社 | Mold with automatic cutting function for film gates |
-
1983
- 1983-03-15 JP JP58043758A patent/JPS6030532B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59169828A (en) | 1984-09-25 |
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