JPS58222829A - Gate cut molding - Google Patents
Gate cut moldingInfo
- Publication number
- JPS58222829A JPS58222829A JP10587482A JP10587482A JPS58222829A JP S58222829 A JPS58222829 A JP S58222829A JP 10587482 A JP10587482 A JP 10587482A JP 10587482 A JP10587482 A JP 10587482A JP S58222829 A JPS58222829 A JP S58222829A
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- gate
- mold
- die
- core
- 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
- 238000000465 moulding Methods 0.000 title claims abstract description 11
- 239000011347 resin Substances 0.000 claims abstract description 15
- 229920005989 resin Polymers 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 abstract description 12
- 239000007924 injection Substances 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 2
- 238000001746 injection moulding Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 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
- B29C45/38—Cutting-off equipment for sprues or ingates
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は溶融樹脂を射、出充填して成形した成形品の
ダートを、ゲート部の移動により切断する成形方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding method in which darts of a molded product formed by injection and injection filling with molten resin are cut by moving a gate portion.
成形品のダートを金型の部分的移動をもって切断する技
術は、特公昭５１−２８６６３号公報や特公昭５３−７
８２号公報などに開示されている。しかしながら前者は
ばね部材により弾圧したキャビティブロックを移動して
切断を行うため、射出圧かばね圧より高いとキャビティ
が開く欠点があり、また後者は圧縮成形を主とする目的
から、金型の閉鎖位置変更を必要とし、圧縮工程に入る
直前にゲート部の移動によ、Ｑｒ−）の切断を行うため
、圧縮工程を不要とする成形には利用し難い欠点があつ
／ζ０また上記従来技術ではキャビティが変化し易く、
または変化するため、いずれも射出充填時のキャビティ
寸法が不安定であり、高精度が要求される精密部品の成
形には適さない欠点もあったっこの発明は上記従来の欠
点を排除し、通常の射出成形と全く同様に射出充填を行
った後においても、ダートの切断が容易にできるように
考えられたものである。The technique of cutting the darts of a molded product by partially moving the mold is disclosed in Japanese Patent Publication No. 51-28663 and Japanese Patent Publication No. 53-7.
This is disclosed in Publication No. 82, etc. However, the former has the disadvantage that the cavity opens when the injection pressure is higher than the spring pressure because the cutting is performed by moving the cavity block that is compressed by a spring member.Also, the latter has the disadvantage that the cavity block opens when the injection pressure is higher than the spring pressure. ζ is easy to change,
In both cases, the dimensions of the cavity during injection and filling are unstable due to changes in the molding process, making them unsuitable for molding precision parts that require high precision.This invention eliminates the above-mentioned drawbacks of the conventional methods, and It was designed so that the darts could be easily cut even after injection filling, just like injection molding.
この発明による方法では、ケゝ−トの切断を射出充填さ
れた樹脂が充分に硬化する以前に、キャビティを形成す
るコア型の一方と、コア型側部のゲート部を反対方向に
押圧して行う。このため切断抵抗は硬化したダートを切
断するときよりも小さ〈なシ、切断に要する押圧力は僅
かでよく、またケ゛−ト断面積を大きく形成しても切断
を円滑になすことができる。この切断面積の拡大は、ケ
ゝ−ト部における異常発熱を防止し、キャビティへの溶
融樹脂の充填を良好となし、更には充分な成形圧力のも
とにて樹脂の成形がなされる結果、成形材料が限定され
ず品質のよい成形品が得られる。In the method according to the present invention, one side of the core mold forming the cavity and the gate portion on the side of the core mold are pressed in opposite directions before the injection-filled resin is sufficiently cured. conduct. Therefore, the cutting resistance is smaller than when cutting hardened dart, and only a small amount of pressing force is required for cutting, and even if the cross-sectional area of the gate is made large, the cutting can be carried out smoothly. This enlargement of the cutting area prevents abnormal heat generation in the housing, improves the filling of the molten resin into the cavity, and allows the resin to be molded under sufficient molding pressure. Good quality molded products can be obtained without any limitations on the molding material.
また強力型締状態下のキャビティは、射出圧力に対して
安定の状態にあり、成形品に適した射出圧のもとに溶融
樹脂の充填が可能となる。このため精密射出成形にも応
用することができる。Furthermore, the cavity under strong mold clamping is in a stable state against injection pressure, and can be filled with molten resin under injection pressure suitable for the molded product. Therefore, it can also be applied to precision injection molding.
更にこの発明を図示の例により詳細に説明する。Further, the present invention will be explained in detail with reference to illustrated examples.
図中１，２はキャビティを形成する一対のコア型、３．
４はコア型側部の一対の可動型でそのバーテング面にケ
゛−ト部５が設けである。In the figure, 1 and 2 are a pair of core molds forming a cavity; 3.
Reference numeral 4 denotes a pair of movable molds on the side portions of the core mold, and a gate portion 5 is provided on the bartending surface thereof.
上記コア型１は、可動盤６に固着した型保持部材７の内
部にある押圧板８と連結し、また一方の可動型３は、型
保持部材７の前面に固定しである。The core mold 1 is connected to a press plate 8 located inside a mold holding member 7 fixed to a movable platen 6, and one movable mold 3 is fixed to the front surface of the mold holding member 7.
上記抑圧板８は型保持部材７の内部に設けた油圧シリン
ダ９のプランジャ１０と連結し、その油圧シリンダ９に
よって上記コア型１を押圧することができるようになっ
ている。The suppressing plate 8 is connected to a plunger 10 of a hydraulic cylinder 9 provided inside the mold holding member 7, so that the hydraulic cylinder 9 can press the core mold 1.
他方のコア型２は、固定盤１１に固着した型保持部材１
２に取付けられ、捷だ他方の可動型４け、型保持部材１
２の内部に設けた油圧シリンダ１３のシランツヤ１４に
連結して、型保持部材１２の前面に位置させである。更
にまた型保持部材１２には、上記ケ。The other core mold 2 has a mold holding member 1 fixed to a fixed platen 11.
2, the other movable mold 4, mold holding member 1
The mold holding member 12 is connected to the cylinder gloss 14 of the hydraulic cylinder 13 provided inside the mold holding member 12 . Furthermore, the mold holding member 12 has the above-mentioned structure.
−ト部５と連通するノズルプッシュ１５が貫設してアリ
、ノズルプッシュ１５にノズルタッチした射出ノズル１
６からの溶融した樹脂が、キャビティ側面のケゝ−ト部
５からキャビティ内に充填されて、成形品１７が成形さ
れるようになっている。- Injection nozzle 1 with a nozzle push 15 penetrating through and communicating with the nozzle push 15, and the nozzle touching the nozzle push 15
The molten resin from 6 is filled into the cavity from the cage part 5 on the side surface of the cavity, so that a molded product 17 is formed.
上記コア型１．２及び可動型３．４の開閉及び強力型締
は、通常構造の型締機構と同様に、可動盤６に連結した
型締ラム１８をもって行う。なお図示の例は可動型３．
４をもってキャビティ側部を形成しているが、ケ゛−ト
部側を除いた他の部分を −コア型相互に嵌合をもっ
て形成してもよい。Opening/closing and strong mold clamping of the core mold 1.2 and the movable mold 3.4 are performed by a mold clamping ram 18 connected to the movable platen 6, similar to a mold clamping mechanism of a normal structure. The illustrated example is a movable type 3.
4 to form the cavity side part, but the other parts except the gate part side may be formed by fitting each other with the core type.
次に上記装置によりこの発明の詳細な説明する０まず第
１図に示すように、型保持部材７．１２の内部にある油
圧シリンダ９．１３のフ０ランジャ１０．１４は後退さ
せて置き、可動盤１６を移動して型閉じを行う。更に型
締ラム１８の出力を上げると、コア型ｌ及び可動型３が
型保持部材７に押圧されて強力型締状錫となる。Next, the present invention will be described in detail using the above-mentioned apparatus. First, as shown in FIG. The movable platen 16 is moved to close the mold. When the output of the mold clamping ram 18 is further increased, the core mold 1 and the movable mold 3 are pressed against the mold holding member 7 to form a strong mold clamp-like tin.
次に射出を行ってキャビティに溶融樹脂が充填されたな
らば、ゲート部５の樹脂が充分に硬化する前に、上記油
圧シリンダ９．１３を加圧する。この加圧に連続して上
記型締ラム１８を油圧シリンダ１３のストロークだけ後
退させる。Next, after injection is performed and the cavity is filled with molten resin, the hydraulic cylinder 9.13 is pressurized before the resin in the gate portion 5 is sufficiently hardened. Following this pressurization, the mold clamping ram 18 is moved back by the stroke of the hydraulic cylinder 13.
この型締ラム１８の後退に伴い、両方の油圧シリンダ９
．１３のグランジャ１０．１４が前進し、第２図に示す
ように、グランジャ１０は抑圧板８を介してコア型１を
コア型２の方に押圧し、またシランジャ１４は可動型３
．４をコア型１の方へ押圧して、上記ストロークに等し
い寸法だけ可動型３．４を移動させる。この結果、成形
品７は加圧され、ダート部５はキャビティからずれてそ
こに切断が生ずる。As the mold clamping ram 18 retreats, both hydraulic cylinders 9
．． 13 granulars 10 and 14 move forward, and as shown in FIG.
．． 4 towards the core mold 1 to move the movable mold 3.4 by a dimension equal to the above-mentioned stroke. As a result, the molded product 7 is pressurized, and the dart portion 5 is displaced from the cavity, causing a cut there.
このケゝ−トの切断に当っては、各油圧シリンダの出力
を下記のように選択または調整するとよい。When cutting this cage, it is preferable to select or adjust the output of each hydraulic cylinder as follows.
即ち、切断時の出力を、油圧シリンダ１３ｒＦＡＪ、油
圧シリンダ９ ｒＦＢＪ、ラム出力ｒ Ｆ Ｃ’Ｊとし
、ダート切断力をｒＦＧＪとすると、
（ＦＡ−ＦＧ ） ＋ＦＢ ＞ＦＣ’
ＦＡ−ＦＧ＜Ｆ’、 ＦＢ ＜ ＦＣ’なる関係であ
り、上記の関係を保つ限り、射出成形後に型締ラム１８
を後退しても、キャビティが変化することなくケ゛−ト
切断と成形品の加圧の両方を行うことができる。That is, if the outputs at the time of cutting are hydraulic cylinder 13rFAJ, hydraulic cylinder 9rFBJ, ram output rFC'J, and dart cutting force is rFGJ, (FA-FG) +FB >FC'FA-FG<F', The relationship is FB <FC', and as long as the above relationship is maintained, the mold clamping ram 18 after injection molding
Even if the molded product is retracted, the cavity can be both cut and the molded product can be pressurized without changing the cavity.
上記のごとくしてダート切断が完了したならば、成形品
７を加圧したまま冷却を行い、完全に硬化させたのち型
締ラム１８を後退移動させて型開きを行う。この型開き
は一対の可動型３．４の間にて生じ、成形品７はキャビ
ティから離型される。When the dart cutting is completed as described above, the molded product 7 is cooled while being pressurized, and after being completely hardened, the mold clamping ram 18 is moved backward to open the mold. This mold opening occurs between the pair of movable molds 3.4, and the molded product 7 is released from the cavity.
また成形品７の肉厚や材料樹脂によって、ケ゛−ト切断
後の圧縮力を高め、冷却を行いたい場合には、ゲート切
断後にラム出力及び油圧７１Ｊンダ９の出力を増加すれ
ばよく、また冷却行程に応じて押圧力を調整したい場合
には、油圧シリンダ９の出力を調整すればよい。Also, depending on the thickness of the molded product 7 and the material resin, if you want to increase the compression force and cool it after cutting the gate, you can increase the ram output and the output of the hydraulic pressure 71J cylinder 9 after cutting the gate. If it is desired to adjust the pressing force according to the cooling stroke, the output of the hydraulic cylinder 9 may be adjusted.
この発明は上述のように、ダート部の樹脂が充分に硬化
する以前に、成形品を加圧状態にしてゲート部の、移動
によシケ゛−ト切断を行うことから、切断抵抗が小さく
、僅かな可動型の移動によってダート切断を確実になす
ことができる。また成形品は加圧されてもキャビティ変
化はないから精度の高い成形品が得られ、また切断後も
加圧を維持できるので、キャビテイ面に施した繊細な模
様等を成形品表面に正確に転写することもできる。更に
またケ８−ト面積を充分にとることができるので、成形
圧力をも充分に伝達でき、成形状態が良好な精密製品を
量産することができるなどの特長を有する。As described above, in this invention, the molded product is pressurized and the gate part is moved to cut the gate part before the resin in the dart part has sufficiently hardened, so the cutting resistance is small and the cutting resistance is small. Dart cutting can be achieved reliably by moving the movable mold. In addition, the cavity of the molded product does not change even when pressurized, so a highly accurate molded product can be obtained. Also, since the pressure can be maintained even after cutting, delicate patterns on the cavity surface can be accurately printed on the surface of the molded product. It can also be transcribed. Furthermore, since a sufficient cage area can be secured, molding pressure can be sufficiently transmitted, and precision products with good molding conditions can be mass-produced.
図面はこの発明に係るケ゛−ト切断成形方法を実施する
場合に使用される装置を例示するもので、第１図は射出
成形時の半部横断平面図、第２図はダート切断時の半部
横断平面図、第３図は金型の正面図である。
１．２・・・コア型、３，４・・・可動型、５・・・・
・・ｒ−）部、９，１３・・・油圧シリンダ０特許出願
人 日精樹脂工業株式会社The drawings illustrate the apparatus used when carrying out the method for cutting and molding darts according to the present invention. FIG. 1 is a cross-sectional plan view of a half part during injection molding, and FIG. 2 is a cross-sectional plan view of a half part during dart cutting. FIG. 3 is a front view of the mold. 1.2...core type, 3,4...movable type, 5...
...r-) part, 9,13...Hydraulic cylinder 0 Patent applicant Nissei Jushi Kogyo Co., Ltd.
Claims (1)
有する可動型を設け、強力型締状態で上記キャビティに
溶融した樹脂を射出充填したのち、上記ケ゛−ト部の樹
脂が充分に硬化する以前に、上記コア型の一方と可動型
のケ゛−ト部とを反対方向に押圧し、成形品加圧状態に
てゲート部の移動によりゲート切断を行い、上記成形品
が充分に硬化したのち型開きを行うことを特徴とするケ
゛−ト切断成形方法。A movable mold having a gate part is provided on the side of a pair of core molds forming a cavity, and after injecting and filling the cavity with molten resin in a strongly clamped state, the resin in the cavity is sufficiently hardened. Previously, one side of the core mold and the gate part of the movable mold were pressed in opposite directions, and the gate was cut by moving the gate part while the molded product was being pressurized. After the molded product had sufficiently hardened, A method of cutting and molding a gate, which is characterized by opening the mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10587482A JPS58222829A (en) | 1982-06-19 | 1982-06-19 | Gate cut molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10587482A JPS58222829A (en) | 1982-06-19 | 1982-06-19 | Gate cut molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58222829A true JPS58222829A (en) | 1983-12-24 |
| JPS6230086B2 JPS6230086B2 (en) | 1987-06-30 |
Family
ID=14419088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10587482A Granted JPS58222829A (en) | 1982-06-19 | 1982-06-19 | Gate cut molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58222829A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62172027U (en) * | 1986-04-21 | 1987-10-31 | ||
| JP2012081725A (en) * | 2010-10-07 | 2012-04-26 | Lg Chem Ltd | Mold assembly for injection compression molding and method of injection compression molding using the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53782A (en) * | 1977-03-28 | 1978-01-06 | Honshu Paper Co Ltd | Carton transferring apparatus |
-
1982
- 1982-06-19 JP JP10587482A patent/JPS58222829A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53782A (en) * | 1977-03-28 | 1978-01-06 | Honshu Paper Co Ltd | Carton transferring apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62172027U (en) * | 1986-04-21 | 1987-10-31 | ||
| JP2012081725A (en) * | 2010-10-07 | 2012-04-26 | Lg Chem Ltd | Mold assembly for injection compression molding and method of injection compression molding using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6230086B2 (en) | 1987-06-30 |
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