JPH0263050B2 - - Google Patents
Info
- Publication number
- JPH0263050B2 JPH0263050B2 JP60084758A JP8475885A JPH0263050B2 JP H0263050 B2 JPH0263050 B2 JP H0263050B2 JP 60084758 A JP60084758 A JP 60084758A JP 8475885 A JP8475885 A JP 8475885A JP H0263050 B2 JPH0263050 B2 JP H0263050B2
- Authority
- JP
- Japan
- Prior art keywords
- mold clamping
- pressure
- core
- mold
- molded product
- 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 - Lifetime
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、色彩または材質が異つた複数の樹
脂を、同一金型内に形成されたキヤビテイに順次
射出して、一次成形品と二次成形品とが一体とな
つた多色成形品を成形する方法に関するものであ
る。Detailed Description of the Invention (Field of Industrial Application) This invention involves sequentially injecting a plurality of resins of different colors or materials into cavities formed in the same mold to create a primary molded product and a secondary molded product. This invention relates to a method for molding a multicolored molded product that is integrated with a molded product.
（従来の技術）
一般に、金型キヤビテイ部にコアを進退自在に
設け、そのコアをキヤビテイ内に前進させた状態
にて樹脂の一次射出を行い、の後コアを後退さ
せ、一次成形品とコアとの間に生じたキヤビテイ
に他の樹脂を二次射出して、一次成形品と二次成
形品とが一体となつた成形品を成形する多色成形
方法にあつては、一次射出に要した型締圧力下に
てコアの後退移動を行なつている。(Prior art) Generally, a core is provided in the mold cavity so that it can move forward and backward, and primary injection of resin is carried out with the core advanced into the cavity, and then the core is retreated and the primary molded product and core are In the case of a multi-color molding method in which a molded product in which the primary molded product and the secondary molded product are integrated by secondary injection of another resin into the cavity formed between the The core is moved backward under the mold clamping pressure.
（発明が解決しようとする問題点）
上記従来法では、型締圧力により金型が応力状
態にあるときに、コアの後退動作を行なうため、
コアの摺動抵抗が増大し易く、かじりを生じて摺
動不能なつてしまうことすらあり、コアの寿命が
短かくなるなどの問題点があつた。(Problems to be Solved by the Invention) In the conventional method described above, when the mold is in a stressed state due to mold clamping pressure, the core moves backward;
There are problems in that the sliding resistance of the core tends to increase, galling may occur and the core becomes unable to slide, and the life of the core is shortened.
（問題を解決するための手段）
この発明は上記事情から考えたものであつて、
その目的とするところは、コアの移動に際してか
じり等を生じることなく、スムーズな作動を行な
わせる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 problem) This invention was conceived in view of the above circumstances, and
The purpose is to provide a new multicolor molding method that allows smooth operation without causing galling or the like when moving the core.
上記を目的によるこの発明の特徴は、型締ラム
により直接可動盤を押圧して型締を行なう金型の
キヤビテイ部に、二次成形用のキヤビテイを形成
するコアを進退自在に設け、該コアを前進させた
状態にて一次射出を行ない、次に型締状態にて上
記コアを後退させ、そこに生じたキヤビテイに二
次射出を行なつて、一次成形品と二次成形品とか
らなる多色成形品を成形するにあたり、型締シリ
ンダの型締回路の圧力制御弁に、型締圧力の設定
値を異にする３つの圧力設定器を有し、かつシー
ケンスコントローラからの信号により上記圧力設
定器を選択作動する設定圧力切換器を、増幅器を
介して設け、該設定圧力切換器からの信号により
上記圧力制御弁を操作して、上記コア後退時の型
締圧力を一次型締圧力よりも低い二次型締圧力に
減圧し、しかるのち型締圧力を二次型締圧力より
高い三次型締圧力に増圧して、上記二次射出を行
なうことにある。 A feature of the present invention for the above purpose is that a core forming a cavity for secondary molding is provided in a cavity portion of a mold in which mold clamping is performed by directly pressing a movable platen by a mold clamping ram, and that the core is movably moved forward and backward. Primary injection is performed with the core moved forward, then the core is retreated with the mold clamped, and secondary injection is performed into the cavity created there, resulting in a primary molded product and a secondary molded product. When molding multicolor molded products, the pressure control valve of the clamping circuit of the mold clamping cylinder has three pressure setting devices with different clamping pressure settings, and the above pressure is controlled by a signal from the sequence controller. A setting pressure switching device that selects and operates a setting device is provided via an amplifier, and the pressure control valve is operated by a signal from the setting pressure switching device to adjust the mold clamping pressure at the time of core retraction from the primary mold clamping pressure. The secondary injection is performed by reducing the pressure to a lower secondary mold clamping pressure, and then increasing the mold clamping pressure to a tertiary mold clamping pressure higher than the secondary mold clamping pressure.
（作用）
上記の方法では、型締状態下におけるコアの後
退移動を、型締圧力を減圧して行なうため、コア
の摺動抵抗が減少して、コアの移動がスムーズに
行われる。(Function) In the above method, the core is moved backward under the mold clamping state by reducing the mold clamping pressure, so that the sliding resistance of the core is reduced and the core moves smoothly.
更にこの発明を図示の例により具体的に説明す
る。 Further, the present invention will be specifically explained using illustrated examples.
金型１は固定盤２に取付けた雌型１１と、可能
盤３に取付けた雄型１２とからなり、可能盤３は
他方の固定盤４側に設た型締シリンダ５の型締ピ
ストン６と、型締ラム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。 The mold 1 consists of a female mold 11 attached to a fixed plate 2 and a male die 12 attached to a movable plate 3. are connected via a mold clamping ram 7, and are guided by tie bars 8 to open and close.
上記雄型１２の内部には金型キヤビテイ部を一
次成型用と二次成形用の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の型画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 12, there are two cavities 9, 1 for primary molding and secondary molding.
A hydraulic cylinder 1 that moves the core 13 forward and backward relative to the pattern 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、一次型締圧
力、二次型締圧力、三次型締圧力を設定する３つ
の圧力設定器２１，２２，２３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２４に継げ
て設けられており、更に設定圧力切換器２４から
の信号は増幅器２５を介して型締回路上に設けら
れた圧力制御弁２６に送られるようになつてい
る。 20 is a sequence controller, and three pressure setting devices 21, 22, and 23 for setting primary mold clamping pressure, secondary mold clamping pressure, and tertiary mold clamping pressure sequentially select the set pressures according to signals from the sequence controller 20. The pressure control valve 24 is connected to a set pressure switch 24 that issues a signal, and the signal from the set pressure switch 24 is sent via an amplifier 25 to a pressure control valve 26 provided on the mold clamping circuit. ing.
また、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、型締圧
力は一次側が低く、三次側が高く設定されてお
り、その型締圧力の設定値は下記の式により求め
られる。 In addition, in this embodiment, since the projected area of the cavity 10 for secondary molding is larger than the projected area of the cavity 9 for primary molding, the clamping pressure is set low on the primary side and high on the tertiary side. The set value of the mold clamping pressure is determined by the following formula.
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→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：Kl／cm2、面積：cm2
なお図中２７は方向切換弁、２８は油圧源を示
す。 Mold clamping pressure = Effective injection pressure x Projected area / Pressure receiving area of mold clamping piston → Mold clamping pressure ≧ Effective injection pressure x Projected area / Pressure receiving area of mold clamping piston However, pressure: Kl/cm 2 , area: cm 2 . Inside 27 is a directional control valve, and 28 is a hydraulic power 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
高速移動して直圧により型締したのちに、一次型
締圧力を与て行われる。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
締型後に設定圧力切換器２４が一次型締圧力を選
択し、それによる圧力制御弁２６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 advancing the core 13 by hydraulic pressure, moving the movable platen 3 in the mold open position at high speed, clamping the mold by direct pressure, and then applying primary mold clamping pressure. This set value of the primary mold clamping pressure is obtained from the above formula, and after high-speed clamping, the set pressure switch 24 selects the primary mold clamping pressure and operates the pressure control valve 26 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.
上記一次成形品３０の冷却時間が過ぎると、上
記設定圧力切換器２４が二次型締圧力を選択して
圧力制御弁２６を作動させ、金型１を開くことな
く、そのままの状態で、型締圧力を一次型締圧力
よりも低圧（０Kg／cm2であつてもよい）の二次型
締圧力に減圧する。 When the cooling time of the primary molded product 30 has passed, the set pressure switching device 24 selects the secondary mold clamping pressure and operates the pressure control valve 26, and the mold 1 is left in that state without opening. The clamping pressure is reduced to a secondary clamping pressure that is lower than the primary clamping pressure (which may be 0 kg/cm 2 ).
型締圧力が減圧されると、上記油圧シリンダ１
４が作動してコア１３を後退移動させ、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。コア１３が完全に後退する
と、信号によつて設定圧力切換器２４が、二次型
締圧力より高い三次型締圧力を選択し、圧力制御
弁２６を作動して、型締圧力を増圧させる。 When the mold clamping pressure is reduced, the hydraulic cylinder 1
4 operates to move the core 13 backward, forming a cavity 10 in the center of the primary molded product 30, as shown in FIG. When the core 13 is completely retracted, a signal causes the set pressure switch 24 to select a tertiary mold clamping pressure higher than the secondary mold clamping pressure, and operates the pressure control valve 26 to increase the mold clamping pressure. .
この型締圧力の増圧後に、射出シリンダ１８か
ら上記のキヤビテイ１０に他の樹脂が射出充填さ
れ、更に二次的に冷却によつて、キヤビテイ１０
の樹脂は一次成形品３０の中央部に成形された二
次成形品３１となる。そして冷却時間終了後に、
方向切換弁２７の作動をもつて型締シリンダ５の
油圧を落し、型締力を除いてから第３図に示すよ
うに金型を開くと、多色成形品３２が雄型１２か
ら離型される。 After increasing the mold clamping pressure, another resin is injected and filled into the cavity 10 from the injection cylinder 18, and then secondary cooling is performed to fill the cavity 10.
The resin becomes the secondary molded product 31 molded in the center of the primary molded product 30. And after the cooling time is over,
When the hydraulic pressure of the mold clamping cylinder 5 is reduced by operating the directional control valve 27 to remove the mold clamping force and the mold is opened as shown in FIG. 3, the multicolored molded product 32 is released from the male mold 12. be done.
第４図以下に示す例は、上記雌型１１と雄型１
２とによつて形成された一次成形品のキヤビテイ
９の側部に、上記コア１３によつて二次成形用の
キヤビテイ１０を連続形成した場合に示すもので
あつて、コア１３は金型１のパーテイング面に沿
つて進退自在に設けられ、またコア移動用の油圧
シリンダ１４は、金型１の外側に設けられてい
る。 The example shown in FIG. 4 and below is the female mold 11 and the male mold 1.
This figure shows a case in which a cavity 10 for secondary molding is continuously formed by the core 13 on the side of the cavity 9 of the primary molded product formed by the mold 1. A hydraulic cylinder 14 for moving the core is provided outside the mold 1 so as to be able to move forward and backward along the parting surface of the mold 1 .
なお２９ａはコア後退確認近接スイツチ、２９
ｂはコア前進確認近接スイツチで、それらは油圧
シリンダ１４のピストンに連結した検知ロツド２
９ｃによつて作動する。 In addition, 29a is a core retraction confirmation proximity switch, 29
b is a core advance confirmation proximity switch, which is connected to the detection rod 2 connected to the piston of the hydraulic cylinder 14.
9c.
この実施例においても、コア１３の後退移動時
には、型締圧力は前記実施例の場合と同様に一次
型締圧力よりも減圧され、第５図及び第６図に示
すように、前記実施例と同様な射出工程の下に一
次成形品３０の側部に二次成形品３１を有する多
色成形品３２が成形される。 In this embodiment as well, when the core 13 moves backward, the mold clamping pressure is lower than the primary mold clamping pressure as in the previous embodiment, and as shown in FIGS. A multicolored molded product 32 having a secondary molded product 31 on the side of the primary molded product 30 is molded using a similar injection process.
（発明の効果）
この発明は上述のように、コアを後退移動して
二次成形用のキヤビテイを形成するときに、型締
圧力を減圧して金型内の応力を緩和してからコア
を移動するため、コアの摺動抵抗がきわめて小さ
く、移動スムーズに行われてかじりなどが生じ難
くなり、コア及び金型の寿命が伸びて長期の使用
に耐える。また型締圧力設定値を異にする３つの
圧力設定器をシーケンコントローラからの信号に
より選択作動し、該設定圧力切換器からの信号に
より型締シリンダの型締回路の圧力制御弁を操作
して、型締圧力だけを変化させるだけであるか
ら、型締ラムはそのままであり、再型締に際して
型締ラムを動かす必要もないので、圧力変更の応
答性がよく、コアの移動に要する時間も短縮され
るため、成形時間の短縮をも図ることができるな
どの特長を有する。(Effects of the Invention) As described above, when the core is moved backward to form a cavity for secondary molding, the clamping pressure is reduced to relieve the stress in the mold before moving the core. Because of the movement, the sliding resistance of the core is extremely small, and the movement is smooth and galling is less likely to occur, extending the life of the core and mold, making it durable for long-term use. In addition, three pressure setting devices with different mold clamping pressure settings are selectively activated by a signal from the sequence controller, and a pressure control valve in the mold clamping circuit of the mold clamping cylinder is operated by a signal from the set pressure switching device. Since only the mold clamping pressure is changed, the mold clamping ram remains the same, and there is no need to move the mold clamping ram when re-clamping the mold, so the response to pressure changes is good and the time required to move the core is shortened. Since the molding time is shortened, the molding time can also be shortened.
図面はこの発明に係る多色成形方法を実施し得
る装置を示すもので、第１図は第１実施例の略示
縦断面図、第２図及び第３図はその成形工程を示
す金型部分の縦断正面図、第４図は第２実施例の
略示縦断面図、第５図及び第６図はその成形工程
を示す金型部分の縦断正面図である。
９，１０……キヤビテイ、１１……雌型、１２
……雄型、１３……コア、１４……油圧シリン
ダ、３０……一次成形品、３１……二次成形品、
３２……多色成形品、２１，２２，２３……圧力
設定器、２４……設定圧力切換器、２５……増幅
器、２６……圧力制御弁。
The drawings show an apparatus capable of carrying out the multicolor molding method according to the present invention, and FIG. 1 is a schematic longitudinal sectional view of the first embodiment, and FIGS. 2 and 3 are molds showing the molding process. FIG. 4 is a schematic longitudinal sectional view of the second embodiment, and FIGS. 5 and 6 are longitudinal sectional front views of the mold portion showing the molding process thereof. 9, 10...Cavity, 11...Female type, 12
... Male mold, 13 ... Core, 14 ... Hydraulic cylinder, 30 ... Primary molded product, 31 ... Secondary molded product,
32...Multicolor molded product, 21, 22, 23...Pressure setting device, 24...Pressure setting switch, 25...Amplifier, 26...Pressure control valve.
Claims (1)
れる金型のキヤビテイ部に、二次成形用のキヤビ
テイを形成するコアを進退自在に設け、該コアを
前進させた状態にて一次射出を行ない、次に型締
状態下にて上記コアを後退させ、そこに生じたキ
ヤビテイに二次射出を行なつて、一次成形品と二
次成形品とからなる多色成形品を成形するにあた
り、型締シリンダの型締回路の圧力制御弁に、型
締圧力の設定値を異にする３つの圧力設定器を有
し、かつシーケンスコントローラの信号により上
記圧力設定器を選択作動する設定圧力切換器を、
増幅器を介して設け、該設定圧力切換器からの信
号により上記圧力制御弁を操作して、上記コア後
退時の型締圧力を一次型締圧力よりも低い二次型
締圧力に減圧し、しかるのち型締圧力を二次型締
圧力より高い三次型締圧力に増圧して、上記二次
射出を行なうことを特徴とする多色成形方法。1 A core that forms a cavity for secondary molding is provided in the cavity part of the mold, which is clamped by directly pressing a movable platen by a mold clamping ram, so that it can move forward and backward, and the primary injection is performed with the core advanced. Then, under the mold clamping condition, the above-mentioned core is retreated, and secondary injection is performed into the cavity formed therein to form a multicolored molded product consisting of a primary molded product and a secondary molded product. , the pressure control valve of the mold clamping circuit of the mold clamping cylinder has three pressure setting devices with different set values of the mold clamping pressure, and the pressure setting device is selectively activated by a signal from a sequence controller. the vessel,
Provided via an amplifier, the pressure control valve is operated by a signal from the set pressure switching device to reduce the mold clamping pressure at the time of core retraction to a secondary mold clamping pressure lower than the primary mold clamping pressure, and then A multicolor molding method characterized in that the secondary injection is performed by subsequently increasing the mold clamping pressure to a tertiary mold clamping pressure higher than the secondary mold clamping pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8475885A JPS61242818A (en) | 1985-04-20 | 1985-04-20 | Multi-color molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8475885A JPS61242818A (en) | 1985-04-20 | 1985-04-20 | Multi-color molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61242818A JPS61242818A (en) | 1986-10-29 |
| JPH0263050B2 true JPH0263050B2 (en) | 1990-12-27 |
Family
ID=13839581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8475885A Granted JPS61242818A (en) | 1985-04-20 | 1985-04-20 | Multi-color molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61242818A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0663825U (en) * | 1993-02-12 | 1994-09-09 | 日産ディーゼル工業株式会社 | Engine cylinder block structure |
| JP2004122793A (en) * | 2000-12-18 | 2004-04-22 | Gifu Auto Body Industry Co Ltd | Mold |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62170315A (en) * | 1986-01-24 | 1987-07-27 | Sumitomo Heavy Ind Ltd | Injection molding method |
| JPS63116314U (en) * | 1987-01-21 | 1988-07-27 | ||
| JP2585102B2 (en) * | 1989-07-21 | 1997-02-26 | 松下電工株式会社 | Multicolor molding method in injection molding |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6164416A (en) * | 1984-09-06 | 1986-04-02 | Sony Corp | Injection forming method |
-
1985
- 1985-04-20 JP JP8475885A patent/JPS61242818A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0663825U (en) * | 1993-02-12 | 1994-09-09 | 日産ディーゼル工業株式会社 | Engine cylinder block structure |
| JP2004122793A (en) * | 2000-12-18 | 2004-04-22 | Gifu Auto Body Industry Co Ltd | Mold |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61242818A (en) | 1986-10-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |