JPH0515532B2 - - Google Patents
Info
- Publication number
- JPH0515532B2 JPH0515532B2 JP60083669A JP8366985A JPH0515532B2 JP H0515532 B2 JPH0515532 B2 JP H0515532B2 JP 60083669 A JP60083669 A JP 60083669A JP 8366985 A JP8366985 A JP 8366985A JP H0515532 B2 JPH0515532 B2 JP H0515532B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- pressure
- molding
- cavity
- mold clamping
- 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 - Fee Related
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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
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)
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は２色または２種の樹脂を同一金型内
に順次射出して成形を行う多色成形方法に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a multicolor molding method in which two colors or two types of resins are sequentially injected into the same mold.
（従来の技術）
この種の成形方法では、金型キヤビテイ部に進
退自在なコアを設け、そのコアを前進させた状態
にて形成されるキヤビテイに１つの樹脂を一次的
に射出充填したのち、コアを後退させて、一次成
形品とコアとの間にキヤビテイを形成し、そのキ
ヤビテイに他の樹脂を同一型締力の下に二次的に
射出充填しており、これにより一次成形品と二次
成形品とが一体となつた多色成形品を得ている。(Prior art) In this type of molding method, a core that can move forward and backward is provided in the mold cavity, and a single resin is primarily injected and filled into the cavity formed by moving the core forward. The core is moved back to form a cavity between the primary molded product and the core, and another resin is secondarily injected into the cavity under the same mold clamping force. A multicolored molded product that is integrated with the secondary molded product is obtained.
（発明が解決しようとする問題点）
上記従来法にあつては、投影面積の小さいキヤ
ビテイへの樹脂の充填においても、投影面積の大
きな方のキヤビテイへの樹脂の充填に際して設定
された型締圧力を用いているため、金型は必要以
上の応力を受け、特に一次成形に用いられるキヤ
ビテイの投影面積が小さいときには、金型相互の
接触面の面圧が高くなつて、金型に変形が生じ、
コアにかじりが生じたりして金型の寿命が短かく
なるばかりか、型締時に必要以上の型締力を発生
させるため、エネルギーの浪費ともなるなどの問
題があつた。(Problems to be Solved by the Invention) In the above conventional method, even when filling a cavity with a small projected area with resin, the mold clamping pressure set when filling the resin into a cavity with a large projected area is As a result, the mold is subjected to more stress than necessary, and especially when the projected area of the cavity used for primary forming is small, the surface pressure of the contact surfaces between the molds increases, causing deformation of the mold. ,
This not only shortens the life of the mold due to galling of the core, but also causes problems such as a waste of energy as more mold clamping force is generated than necessary during mold clamping.
（問題点を解決するための手段）
この発明は上記事情から考えられたものであつ
て、その目的とするところは、金型に必要以上の
型締圧力を与えず、かつエネルギーの浪費をも防
ぐことのできる新たな多色成形方法を提供するこ
とにある。(Means for Solving the Problems) This invention was conceived in view of the above circumstances, and its purpose is to prevent unnecessary mold clamping pressure from being applied to the mold and to avoid wasting energy. The purpose is to provide a new multicolor molding method that can prevent the above problems.
上記目的による本発明の特徴は、金型キヤビテ
イ部に進退自在なコアを設け、該コアの進退移動
をもつて、同一金型内に投影面積が異なる２つの
キヤビテイを形成し、その各キヤビテイに２色ま
たは２種の樹脂を一次と二次とに分けて順次充填
する多色成形方法において、一次成形時と二次成
形時の型締圧力を、上記各キヤビテイの投影面積
と有効射出力に見合つた圧力に設定し、その型締
圧力の下にそれぞれの成形を行うことにある。 The feature of the present invention according to the above object is that a core that can move forward and backward is provided in the mold cavity, and by moving the core forward and backward, two cavities with different projected areas are formed in the same mold, and each cavity is provided with a core that can move forward and backward. In a multicolor molding method in which two colors or two types of resin are divided into primary and secondary parts and filled sequentially, the mold clamping pressure during primary molding and secondary molding is adjusted to the projected area and effective injection force of each cavity above. The purpose is to set the appropriate pressure and perform each molding under that mold clamping pressure.
（作用）
上記多色成形方法では、同一金型内にて行なわ
れる樹脂の射出充填を、別個の成形として区別
し、各キヤビテイの投影面積と有効射出圧力に見
合つた型締圧力の下に射出充填を行うことから、
金型に対する型締圧力の影響は小さく、金型の変
形及びコアのかじりなどが生じ難くなり、消費エ
ネルギーも節減される。(Function) In the multicolor molding method described above, resin injection filling performed in the same mold is distinguished as separate molding, and injection is performed under mold clamping pressure commensurate with the projected area and effective injection pressure of each cavity. From filling,
The influence of mold clamping pressure on the mold is small, making it difficult for mold deformation and core galling to occur, and energy consumption is also reduced.
更にこの発明を図示の例により詳説する。 Further, the present invention will be explained in detail with reference to illustrated examples.
（実施例）
金型１は、固定盤２に取付けた雌型１１と、可
動盤３に取付けた雄型１２とからなり、可動盤３
は、他方の固定盤４側に設けた型締シリンダ５の
型締ピストン６と、型締ロツド７を介して連結さ
れ、タイバー８に案内されて開閉移動する。(Example) The mold 1 consists of a female mold 11 attached to a fixed platen 2 and a male mold 12 attached to a movable platen 3.
is connected to a mold clamping piston 6 of a mold clamping cylinder 5 provided on the other fixed platen 4 side via a mold clamping rod 7, and is guided by tie bars 8 to open and close.
上記雄型１１の内部には金型キヤビテイ部を一
次成形用と二次成形用の２つのキヤビテイ９，１
０に順次区画するコア１３と、該コア１３を雌型
１１の型面に対し進退移動させる油圧シリンダ１
４とが設けてある。 Inside the male mold 11, there are two cavities 9, 1 for primary molding and secondary molding.
A hydraulic cylinder 1 that moves the core 13 forward and backward with respect to the mold surface of the female mold 11.
4 is provided.
また上記キヤビテイ９，１０には、注入路１
５，１６がそれぞれ設けてあり、その注入路１
５，１６のゲートに固定盤２を通して位置させた
２つの射出シリンダ１７，１８の各々がノズルタ
ツチさせてある。 In addition, the cavities 9 and 10 include an injection path 1.
5 and 16 are respectively provided, and the injection path 1
Two injection cylinders 17 and 18, which are positioned through the fixed platen 2 through the gates 5 and 16, have nozzles touching each other.
２０はシーケンスコントローラで、一次成形品
を成形するときの一次型締圧力、二次成形品を成
形するときの二次型締圧力を設定する２つの圧力
設定器２１，２２がシーケンスコントローラ２０
からの信号によつて該設定圧力を順次選択し信号
を発する設定圧力切換器２３に継げて設けられて
おり、更に設定圧力切換器２３からの信号は増幅
器２４を介して型締回路上に設けられた圧力制御
弁２５に送られるようになつている。本実施例で
は、二次成形用のキヤビテイ１０の投影面積が、
一次成形用のキヤビテイ９の投影面積より大きい
場合を例とするので、一次型締圧力は低く、二次
型締圧力は高く設定されており、その型締圧力の
設定値は下記の式により求められる。 20 is a sequence controller, and the sequence controller 20 includes two pressure setting devices 21 and 22 that set the primary mold clamping pressure when molding the primary molded product and the secondary mold clamping pressure when molding the secondary molded product.
The set pressure switch 23 is connected to a set pressure switch 23 that sequentially selects the set pressure and issues a signal based on the signal from the set pressure switch 23, and furthermore, the signal from the set pressure switch 23 is connected to the mold clamping circuit via an amplifier 24. The pressure control valve 25 is supplied with the pressure control valve 25. In this embodiment, the projected area of the cavity 10 for secondary molding is
As an example, the case is larger than the projected area of the cavity 9 for primary molding, so the primary mold clamping pressure is set low and the secondary mold clamping pressure is set high.The set value of the mold clamping pressure is calculated using the following formula. It will be done.
型締圧力≧有効射出圧力×投影面積／型締ピストンの
受圧面積
但し、圧力：Kg／cm2 面積：cm2
なお、有効射出圧力とは、実際にキヤビテイに
かかる射出圧力をいう。また、図中２６は方向切
換弁、２７は油圧源を示す。 Mold clamping pressure ≧ Effective injection pressure × Projected area / Pressure-receiving area of mold clamping piston However, pressure: Kg/cm 2 Area: cm 2 Note that effective injection pressure refers to the injection pressure actually applied to the cavity. Further, in the figure, 26 indicates a directional switching valve, and 27 indicates a hydraulic pressure source.
上記装置による多色成形は、コア１３を油圧に
より前進させ、また型開位置にあつた可動盤３を
高速移動して型締したのちに、一次型締圧力を与
えて行われる。この一次型締圧力の設定値は、上
記式から求められたものであつて、高速型締後に
設定圧力切換器２３が一次型締圧力を選択し、そ
れにより圧力制御弁２５を作動させることにより
生ずる。 Multicolor molding by the above-mentioned apparatus is carried out by moving the core 13 forward by hydraulic pressure, moving the movable platen 3 in the mold open position at high speed to clamp the mold, and then applying primary mold clamping pressure. The set value of the primary mold clamping pressure is obtained from the above formula, and after high-speed mold clamping, the set pressure switch 23 selects the primary mold clamping pressure, and the pressure control valve 25 is actuated accordingly. arise.
上記型締シリンダ５によつて、金型１に一次型
締圧力が与えられると、射出シリンダ１７からキ
ヤビテイ９に樹脂が射出充填され、更に一次的な
冷却によつて樹脂は、第２図に示す形状の一次成
形品３０となる。 When primary mold clamping pressure is applied to the mold 1 by the mold clamping cylinder 5, resin is injected and filled into the cavity 9 from the injection cylinder 17, and by further primary cooling, the resin is deposited as shown in FIG. A primary molded product 30 having the shape shown is obtained.
上記一次冷却時間終了後に、油圧シリンダ１４
を作動してコア１３を後退させ、第２図に示すよ
うに、一次成形品３０の中央部にキヤビテイ１０
を形成すると、信号によつて設定圧力切換器２３
が、型締圧力を二次型締圧力に切換え、圧力制御
弁２５が作動して、上記式により求められた設定
値による二次型締圧力に増圧される。 After the above primary cooling time is over, the hydraulic cylinder 14
The core 13 is moved backward, and the cavity 10 is placed in the center of the primary molded product 30 as shown in FIG.
is formed, the set pressure switch 23 is activated by a signal.
However, the mold clamping pressure is switched to the secondary mold clamping pressure, the pressure control valve 25 is operated, and the pressure is increased to the secondary mold clamping pressure according to the set value determined by the above formula.
上記増圧の後に、射出シリンダ１８から上記キ
ヤビテイ１０に他種の樹脂が射出充填され、更に
二次的な冷却によつて、キヤビテイ１０の樹脂
は、一次成形品３０の中央部に形成された二次成
形品３１となる。 After the pressure increase, another type of resin was injected and filled into the cavity 10 from the injection cylinder 18, and through secondary cooling, the resin in the cavity 10 was formed in the center of the primary molded product 30. A secondary molded product 31 is obtained.
そして冷却時間終了後に、第３図に示すように
金型１を開くと、一次成形品３０と二次成形品３
１とが一体となつた多色成形品３２が、雄型１２
から離型される。 After the cooling time is over, as shown in FIG. 3, when the mold 1 is opened, the primary molded product 30 and the secondary molded product 3 are removed.
1 is integrated with the male mold 12.
It is released from the mold.
（発明の効果）
この発明は上述のように、一次成形時と二次成
形時の型締圧力を、金型内に形成される２つのキ
ヤビテイの投影面積と有効射出力に見合つた圧力
に設定し、その型締圧力の下にそれぞれの成形を
行うことから、金型の受ける不当な応力を減少す
ることができ、これにより金型の変形やコアのか
じりなどが防止され、金型の寿命が長くなるばか
りか、型締に要するエネルギーの消費を節減する
こともできるなどの利点を有する。(Effect of the invention) As described above, this invention sets the mold clamping pressure during primary molding and secondary molding to a pressure commensurate with the projected area of the two cavities formed in the mold and the effective injection force. Since each molding is performed under the mold clamping pressure, it is possible to reduce undue stress on the mold, which prevents deformation of the mold and galling of the core, and extends the life of the mold. This has the advantage of not only increasing the length of the mold, but also reducing energy consumption required for mold clamping.
図面はこの発明に係る多色成形方法を実施する
場合に用いられる装置の１例を略示するもので、
第１図は一部縦断正面図、第２図は一次成形時の
金型の縦断面図、第３図は多色成形品を離型した
際の金型の縦断面図である。
１……金型、９……一次成形用のキヤビテイ、
１０……二次成形用のキヤビテイ、１１……雌
型、１２……雄型、１３……コア、１４……油圧
シリンダ。
The drawing schematically shows an example of an apparatus used when carrying out the multicolor molding method according to the present invention.
FIG. 1 is a partially longitudinal sectional front view, FIG. 2 is a vertical sectional view of the mold during primary molding, and FIG. 3 is a longitudinal sectional view of the mold when the multicolored molded product is released from the mold. 1... Mold, 9... Cavity for primary molding,
10... Cavity for secondary molding, 11... Female mold, 12... Male mold, 13... Core, 14... Hydraulic cylinder.
Claims (1)
該コアの進退移動をもつて、同一金型内に投影面
積が異なる２つのキヤビテイを形成し、その各キ
ヤビテイに２色または２種の樹脂を一次と二次と
に分けて順次充填する多色成形方法において、一
次成形時と二次成形時の型締圧力を、上記各キヤ
ビテイの投影面積と有効射出力に見合つた圧力に
設定し、その型締圧力の下にそれぞれの成形を行
うことを特徴とする多色成形方法。1 A core that can move forward and backward is provided in the mold cavity,
The core moves forward and backward to form two cavities with different projected areas in the same mold, and each cavity is sequentially filled with two colors or two types of resin as primary and secondary. In the molding method, the mold clamping pressure during primary molding and secondary molding is set to a pressure commensurate with the projected area and effective injection force of each cavity mentioned above, and each molding is performed under that mold clamping pressure. Characteristic multicolor molding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8366985A JPS61241110A (en) | 1985-04-19 | 1985-04-19 | Multi-color molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8366985A JPS61241110A (en) | 1985-04-19 | 1985-04-19 | Multi-color molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61241110A JPS61241110A (en) | 1986-10-27 |
| JPH0515532B2 true JPH0515532B2 (en) | 1993-03-01 |
Family
ID=13808877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8366985A Granted JPS61241110A (en) | 1985-04-19 | 1985-04-19 | Multi-color molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61241110A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63265611A (en) * | 1987-04-23 | 1988-11-02 | Toshiba Mach Co Ltd | Injection molding and mold apparatus therefor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS544957A (en) * | 1977-06-14 | 1979-01-16 | Japan Steel Works Ltd | Manufacture of multiicolor and multiimaterial resin moldings |
| JPS55166628U (en) * | 1979-05-19 | 1980-12-01 |
-
1985
- 1985-04-19 JP JP8366985A patent/JPS61241110A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61241110A (en) | 1986-10-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |