JP2002200649A - Method and apparatus for injection molding - Google Patents

Method and apparatus for injection molding

Info

Publication number
JP2002200649A
JP2002200649A JP2000399755A JP2000399755A JP2002200649A JP 2002200649 A JP2002200649 A JP 2002200649A JP 2000399755 A JP2000399755 A JP 2000399755A JP 2000399755 A JP2000399755 A JP 2000399755A JP 2002200649 A JP2002200649 A JP 2002200649A
Authority
JP
Japan
Prior art keywords
resin
cavities
cavity
injection
control device
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
Application number
JP2000399755A
Other languages
Japanese (ja)
Inventor
Tetsuya Takahashi
哲也 高橋
Akihiko Otsuka
明彦 大塚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Isuzu Motors Ltd
Original Assignee
Isuzu Motors Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Isuzu Motors Ltd filed Critical Isuzu Motors Ltd
Priority to JP2000399755A priority Critical patent/JP2002200649A/en
Publication of JP2002200649A publication Critical patent/JP2002200649A/en
Pending legal-status Critical Current

Links

Landscapes

  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To improve a method and an apparatus for simultaneously molding products having different shapes by one mold. SOLUTION: The mold 1 has cavities 10a and 10b having long injection times, cavities 20a and 20b having short injection times, and five resin filling units 50, 50, 70, 80, 80 for supplying resins of a molten state. The resin filling unit 50 having a flow controller 60 of a resin between a hot runner nozzle 52 and a cold runner 54 and the normally open resin filling unit 70 having no flow controller of the resin between a hot runner nozzle 73 and a cold runner 74 are arranged in the cavities 10a and 10b of the long injection times. The resin filling unit 80 having a flow controller 90 between a hot runner nozzle 82 and a cold runner 84 is arranged in the cavities 20a and 20b having short injection times. After a prescribed time is elapsed from a start of molding, the controller 90 is throttled to a half-open state, and hence injecting conditions of both the cavities can be changed.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、合成樹脂を金型内
で射出成形する方法と装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for injection molding a synthetic resin in a mold.

【0002】[0002]

【従来の技術】例えば特開平9−104037号公報
は、並列に配設された形状の異なる複数の金型に樹脂を
射出して、異なる形状の成形品を得る射出成形装置を開
示している。上述した公報にあっては、容積の異なる大
小の金型キャビティへの樹脂の充填開始タイミングに差
をつけて、キャビティ内の充填完了が同時になるように
制御を行っている。この制御では、両方のキャビティへ
の樹脂の充填が行われる時間内にあっては、充填圧力や
速度を含む成形条件が同じとなる。キャビティの容積や
形状によっては、成形条件を変化させることが望ましい
ことがある。
2. Description of the Related Art For example, Japanese Patent Application Laid-Open No. 9-104037 discloses an injection molding apparatus for injecting a resin into a plurality of dies having different shapes arranged in parallel to obtain molded products having different shapes. . In the above-mentioned publication, control is performed such that the filling of the resin into the large and small mold cavities having different volumes is started at different times so that the filling in the cavities is completed at the same time. In this control, the molding conditions including the filling pressure and the speed are the same during the time when both cavities are filled with the resin. Depending on the volume and shape of the cavity, it may be desirable to change the molding conditions.

【0003】[0003]

【発明が解決しようとする課題】上述した制御では、一
方を優先するか、または中間の条件で折り合わせる必要
があり、両方の成形品質を同時に満足することが困難で
あった。そこで本発明は、上述した問題を解決する成形
方法と装置を提供するものである。
In the above-described control, it is necessary to prioritize one of them or perform folding under an intermediate condition, and it is difficult to simultaneously satisfy both molding qualities. Therefore, the present invention provides a molding method and apparatus which solve the above-mentioned problems.

【0004】[0004]

【課題を解決するための手段】本発明の射出成形方法
は、射出時間が異なる複数のキャビティを有する金型を
用い、射出時間が短いキャビティに通ずるコールドラン
ナーの樹脂流量を制御することによって、複数のキャビ
ティの射出成形条件を制御するものである。
The injection molding method of the present invention uses a mold having a plurality of cavities having different injection times, and controls a resin flow rate of a cold runner leading to a cavity having a short injection time. Control the injection molding conditions of the cavity.

【0005】また、本発明の射出成形装置は、射出時間
が異なる複数のキャビティを有する金型と、各キャビテ
ィに連結される樹脂充填装置と、少なくとも射出時間が
短いキャビティ側の樹脂充填装置とキャビティを連結す
るコールドランナーに設けられる樹脂流路面積を制御す
る樹脂流量制御装置を備えるものである。
Further, the injection molding apparatus of the present invention comprises a mold having a plurality of cavities having different injection times, a resin filling apparatus connected to each cavity, and a resin filling apparatus and a cavity at least on the cavity side having a short injection time. And a resin flow control device for controlling the area of the resin flow path provided in the cold runner connecting the two.

【0006】そして、樹脂流量制御装置は、キャビティ
への樹脂射出開始時には、流路を全開とし、一定時間経
過後に流路面積を半開状態に絞り、射出終了まで半開状
態を維持する。具体的には、樹脂流量制御装置は、油圧
ピストンと、油圧ピストンにより作動し、樹脂流路に突
出されるピンを備えるものである。
At the start of resin injection into the cavity, the resin flow control device fully opens the flow path, narrows the flow path area to a half-open state after a certain period of time, and maintains the half-open state until the end of injection. Specifically, the resin flow control device includes a hydraulic piston and a pin that is operated by the hydraulic piston and protrudes into the resin flow path.

【0007】[0007]

【発明の実施の形態】図1は、本発明の成形方法を適用
する金型の概要を示す説明図である。全体を符号1で示
す金型は、射出時間が長いキャビティ10a,10b
と、射出時間が短いキャビティ20a,20bとを有す
る。射出時間が長いキャビティ10a,10bは、同一
の平面形状を有し、例えば車両の左右に取付けられる左
右1対の樹脂製品を成形するためのキャビティである。
射出時間の短いキャビティ20a,20bは、同一の平
面形状を有し、左右1対の樹脂製品を成形するためのキ
ャビティである。
FIG. 1 is an explanatory view showing an outline of a mold to which a molding method of the present invention is applied. The mold shown as a whole by reference numeral 1 has cavities 10a and 10b having a long injection time.
And cavities 20a and 20b having a short injection time. The cavities 10a and 10b having a long injection time have the same plane shape, and are cavities for molding a pair of left and right resin products, for example, attached to the left and right of the vehicle.
The cavities 20a and 20b having a short injection time have the same planar shape, and are cavities for molding a pair of left and right resin products.

【0008】この金型1では、溶融状態の樹脂を供給す
るための5個の樹脂充填装置50,50,70,80,
80を有する。射出時間の長いキャビティ10a,10
bに対しては、ホットランナーノズル52とコールドラ
ンナー54の間に樹脂の流量制御装置60を配設した樹
脂充填装置50と、ホットランナーノズル72とコール
ドランナー74の間に樹脂の流量制御装置を装備しない
常開の樹脂の充填装置70が配設される。
In this mold 1, five resin filling devices 50, 50, 70, 80, and 50 for supplying a molten resin are provided.
80. Cavities 10a, 10 with a long injection time
For b, a resin filling device 50 in which a resin flow control device 60 is disposed between the hot runner nozzle 52 and the cold runner 54, and a resin flow control device between the hot runner nozzle 72 and the cold runner 74. A normally open resin filling device 70 that is not equipped is provided.

【0009】射出時間の短いキャビティ20a,20b
に対しては、ホットランナーノズル82とコールドラン
ナー84の間に樹脂の流量制御装置90を配設した樹脂
の充填装置80がそれぞれ1基づつ配設される。
The cavities 20a, 20b having a short injection time
, One resin filling device 80 in which a resin flow control device 90 is disposed between the hot runner nozzle 82 and the cold runner 84 is provided.

【0010】図2は、射出時間の長いキャビティ10側
に配設される流量制御装置60の構造を示す説明図であ
る。流量制御装置60は、油圧シリンダ62と、油圧シ
リンダ62のロッドに連結されるジョイント64と、ジ
ョイント64に連結されるバルブピン66を有する。そ
して、このバルブピン66は、矢印方向に上下動してコ
ールドランナー52内の流路面積を変化させて、通過す
る樹脂の流量を制御する。
FIG. 2 is an explanatory view showing the structure of the flow control device 60 disposed on the side of the cavity 10 having a long injection time. The flow control device 60 includes a hydraulic cylinder 62, a joint 64 connected to a rod of the hydraulic cylinder 62, and a valve pin 66 connected to the joint 64. The valve pin 66 moves up and down in the direction of the arrow to change the flow path area in the cold runner 52 to control the flow rate of the resin passing therethrough.

【0011】図3は、射出時間の短いキャビティ20側
に配設される樹脂の流量制御装置90の構造を示す説明
図である。この流量制御装置90も、図2の流量制御装
置60と同様に、油圧シリンダ92と、油圧シリンダ9
2のロッドに連結されるジョイント94と、ジョインと
94に連結されるバルブピン96を有し、コールドラン
ナー82の流路面積を制御して、樹脂の流量を制御す
る。
FIG. 3 is an explanatory view showing the structure of a resin flow control device 90 provided on the side of the cavity 20 where the injection time is short. This flow control device 90 also has a hydraulic cylinder 92 and a hydraulic cylinder 9 similarly to the flow control device 60 of FIG.
It has a joint 94 connected to the second rod and a valve pin 96 connected to the join and 94, and controls the flow area of the cold runner 82 to control the flow rate of the resin.

【0012】図4から図7は、本発明による樹脂の成形
工程を示す説明図である。図4は、射出開始直後のキャ
ビティへの樹脂の充填状態を示している。射出時間の長
きキャビティ10に対しては、樹脂の流量制御装置60
付の樹脂充填装置50と常開の樹脂充填装置70から樹
脂が供給されるが、図4のタイミングでは、樹脂充填装
置50の流量制御装置60は閉じられており、樹脂供給
装置70からのみキャビティ10内に樹脂110aが充
填される。射出時間の短いキャビティ20に対しては、
樹脂充填装置80の流量制御装置90が開き、樹脂12
0aが充填される。
FIGS. 4 to 7 are explanatory views showing the resin molding process according to the present invention. FIG. 4 shows a state in which the cavity is filled with resin immediately after the start of injection. For the cavity 10 having a long injection time, the resin flow control device 60
Although the resin is supplied from the resin filling device 50 attached and the resin filling device 70 which is normally opened, the flow control device 60 of the resin filling device 50 is closed at the timing of FIG. 10 is filled with resin 110a. For a cavity 20 with a short injection time,
The flow control device 90 of the resin filling device 80 opens, and the resin 12
0a is filled.

【0013】図5は、充填開始からある時間tが経過
した後の状態を示す。射出時間の長いキャビティ10側
の樹脂充填装置50の流量制御装置60は、閉じられた
状態を保つ。樹脂充填装置70側からの樹脂110bの
樹脂は継続される。射出時間の短いキャビティ20側は
流量制御装置90が半閉状態に制御され、樹脂120b
は絞られた流路を通過して充填される。
[0013] FIG. 5 shows a state after the time t 1 which is the start filling has elapsed. The flow control device 60 of the resin filling device 50 on the side of the cavity 10 where the injection time is long is kept closed. The resin of the resin 110b from the resin filling device 70 side is continued. On the side of the cavity 20 where the injection time is short, the flow control device 90 is controlled to be in a semi-closed state, and the resin 120 b
Is filled through the narrowed flow path.

【0014】図6は、更に時間tが経過した状態を示
す。射出時間が長いキャビティ10側の樹脂充填装置5
0の流量制御装置60は開き、樹脂110C´の充填が
開始される。樹脂充填装置70側からの樹脂110Cの
充填は継続される。射出時間の短いキャビティ20側の
樹脂充填装置80は、流量制御装置90の半開状態が続
き、樹脂120Cは絞られた流路を通って充填が継続さ
れる。
[0014] FIG. 6 shows a state in which elapsed more time t 2. Resin filling device 5 on cavity 10 side with long injection time
The zero flow control device 60 is opened, and the filling of the resin 110C 'is started. The filling of the resin 110C from the resin filling device 70 side is continued. In the resin filling device 80 on the side of the cavity 20 where the injection time is short, the flow control device 90 is kept in a half open state, and the filling of the resin 120C is continued through the narrowed flow path.

【0015】図7は、充填完了時の状態を示す。射出時
間の長いキャビティ10側の2個の樹脂供給装置50,
70からの樹脂は合体し、製品形状の樹脂110dが成
形される。両者の樹脂は接合線であるウエルドWを形
成する。このウエルドWの位置は、製品の目立たない
位置に形成されるように、樹脂充填装置50を制御する
ことができる。射出時間の短いキャビティ20側の樹脂
充填装置80は、流量制御装置90の半開状態が保た
れ、樹脂120dの充填が完了する。
FIG. 7 shows a state at the time of completion of filling. Two resin supply devices 50 on the side of the cavity 10 where the injection time is long,
The resins from 70 are united to form a product-shaped resin 110d. Both the resin to form a weld W 1 is a joint line. The position of the weld W 1, as are formed in positions inconspicuous products, it is possible to control the resin filling device 50. In the resin filling device 80 on the cavity 20 side where the injection time is short, the flow control device 90 is kept in a half-open state, and the filling of the resin 120d is completed.

【0016】図8は、射出時間が長いキャビティ10側
の流量制御装置のバルブピン66の作動を示す。射出開
始時(a)には、バルブピン66は前進してコールドラ
ンナーP10を堰止めている。時間tが経過すると
(b)、バルブピン66は後退して樹脂は、キャビティ
10側へ送られる。樹脂の充填が完了して型開きが行わ
れるときにも、このバルブピン66は後退位置にある。
図の(c)は、バルブピン66が前進して、コールドラ
ンナーP10を突き出した状態を示す。
FIG. 8 shows the operation of the valve pin 66 of the flow control device on the side of the cavity 10 where the injection time is long. At the start of injection (a), the valve pin 66 moves forward to block the cold runner P10. When the time t 2 has elapsed (b), the valve pin 66 is resin retracted is fed to the cavity 10 side. The valve pin 66 is also at the retracted position when the mold is opened after the filling of the resin is completed.
(C) of the figure shows a state in which the valve pin 66 advances and projects the cold runner P10.

【0017】図9は、射出時間の短いキャビティ側の流
量制御装置のバルブピン96の作動を示す。図の(a)
は、樹脂充填開始直後を示し、バルブピン96は後退し
てコールドランナーP20を通り、樹脂はキャビティ1
0側へ送られる。時間tが経過すると(b)、バルブ
ピン96は油圧により前進し、バルブピンに作用する樹
脂圧と油圧のバランスで、流路を半開位置に絞る。樹脂
の流量が絞られるので、流速が遅くなる。また、圧力損
失が大きくなり、成形品への低圧充填が可能となるの
で、バリの発生が押えられる。図の(c)は充填が完了
し、金型を開いた状態を示す。充填完了時もバルブピン
は油圧により押されているのでバルブピン96は1〜2
mm前進している。図の(d)はバルブピン96が後退
して初期状態に復帰した状態を示す。
FIG. 9 shows the operation of the valve pin 96 of the flow control device on the cavity side where the injection time is short. (A) in the figure
Indicates that the resin filling has just started, the valve pin 96 retracts and passes through the cold runner P20, and the resin
It is sent to the 0 side. When the time t 1 has elapsed (b), the valve pin 96 is advanced by a hydraulic, the balance of the resin pressure and the hydraulic pressure acting on the valve pin, squeeze the channel half-open position. Since the flow rate of the resin is reduced, the flow velocity becomes slow. Further, the pressure loss increases, and low-pressure filling of the molded product becomes possible, so that the occurrence of burrs is suppressed. (C) of the figure shows a state where the filling is completed and the mold is opened. When filling is completed, the valve pin is pressed by hydraulic pressure, so that the valve pin 96
mm. FIG. 6D shows a state in which the valve pin 96 has retreated and returned to the initial state.

【0018】[0018]

【発明の効果】本発明は以上のように、樹脂の射出時間
が異なる複数のキャビティを有する金型を用いて、形状
の異なる複数の製品を同時に射出成形する際に、少なく
とも射出時間が短い側のキャビティに充填される樹脂の
コールドランナーの流量を制御して、複数のキャビティ
への射出が完了するタイミングを一致させるものであ
る。具体的には、コールドランナー部に流量制御手段を
設けて、射出開始から一定時間経過した後には、コール
ドランナーの流量を絞り、射出時間の遅延を図るもので
ある。この間に射出時間が長いキャビティへの樹脂の充
填が進み、射出完了のタイミングを一致させることがで
きる。すなわち、各キャビティでの射出成形条件を最適
に設定することができる。
As described above, according to the present invention, when a plurality of products having different shapes are simultaneously injection-molded by using a mold having a plurality of cavities having different injection times of the resin, at least the injection time is shorter. Is controlled by controlling the flow rate of the resin filled in the cavity of the cold runner so that the timing of completing the injection into the plurality of cavities is matched. Specifically, a flow control means is provided in the cold runner section to reduce the flow rate of the cold runner after a predetermined time has elapsed from the start of injection, thereby delaying the injection time. During this time, the filling of the resin into the cavity having a long injection time proceeds, and the timing of injection completion can be matched. That is, the injection molding conditions in each cavity can be set optimally.

【0019】また、各キャビティへの樹脂の流量を制御
することによって、各キャビティの射出成形条件の設定
の自由度は増大する。さらに、各キャビティに複数の樹
脂充填装置を設けて、各充填装置からの樹脂の流量を制
御することによって、ウエルドの位置を任意に変更する
ことができる。これにより、ウエルドの位置を製品の上
で最も支障のない位置に設定することができ、製品の品
質を向上することができる。
Further, by controlling the flow rate of the resin to each cavity, the degree of freedom in setting the injection molding conditions for each cavity is increased. Further, by providing a plurality of resin filling devices in each cavity and controlling the flow rate of the resin from each filling device, the position of the weld can be arbitrarily changed. As a result, the position of the weld can be set to the position that does not cause any trouble on the product, and the quality of the product can be improved.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明を実施する金型の説明図。FIG. 1 is an explanatory view of a mold for implementing the present invention.

【図2】樹脂流量制御装置の説明図。FIG. 2 is an explanatory diagram of a resin flow control device.

【図3】樹脂流量制御装置の説明図。FIG. 3 is an explanatory diagram of a resin flow control device.

【図4】射出工程を示す説明図。FIG. 4 is an explanatory view showing an injection step.

【図5】射出工程を示す説明図。FIG. 5 is an explanatory view showing an injection step.

【図6】射出工程を示す説明図。FIG. 6 is an explanatory view showing an injection step.

【図7】射出工程を示す説明図。FIG. 7 is an explanatory view showing an injection step.

【図8】コールドランナー部の説明図。FIG. 8 is an explanatory view of a cold runner section.

【図9】コールドランナー部の説明図。FIG. 9 is an explanatory view of a cold runner section.

【符号の説明】[Explanation of symbols]

1 金型 10a,10b 射出時間の長いキャビティ 20a、20b 射出時間の短いキャビティ 50 樹脂充填装置 60 流量制御装置 70 樹脂充填装置 80 樹脂充填装置 90 流量制御装置 Reference Signs List 1 mold 10a, 10b cavity with long injection time 20a, 20b cavity with short injection time 50 resin filling device 60 flow control device 70 resin filling device 80 resin filling device 90 flow control device

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 射出時間が異なる複数のキャビティを有
する金型を用いる射出成形方法であって、射出時間が短
いキャビティに通ずるコールドランナーの樹脂流量を制
御することによって、複数のキャビティの射出成形条件
を制御する射出成形方法。
1. An injection molding method using a mold having a plurality of cavities having different injection times, wherein an injection molding condition of a plurality of cavities is controlled by controlling a resin flow rate of a cold runner leading to a cavity having a short injection time. Control the injection molding method.
【請求項2】 射出時間が異なる複数のキャビティを有
する金型と、各キャビティに連結される樹脂充填装置
と、少なくとも射出時間が短いキャビティ側の樹脂充填
装置とキャビティを連結するコールドランナーに設けら
れる樹脂流路面積を制御する樹脂流量制御装置を備える
射出成形装置。
2. A mold having a plurality of cavities having different injection times, a resin filling device connected to each cavity, and a cold runner connecting at least the cavity with the resin filling device on the cavity side having a short injection time. An injection molding device including a resin flow control device for controlling a resin flow path area.
【請求項3】 樹脂流量制御装置は、キャビティへの樹
脂射出開始時には、流路を全開とし、一定時間経過後に
流路面積を半開状態に絞り、射出終了まで半開状態を維
持する請求項2記載の射出成形装置。
3. The resin flow control device according to claim 2, wherein when the resin is injected into the cavity, the flow path is fully opened, the flow path area is reduced to a half open state after a lapse of a predetermined time, and the half flow state is maintained until the injection is completed. Injection molding equipment.
【請求項4】 樹脂流量制御装置は、油圧ピストンと、
油圧ピストンにより作動し、樹脂流路に突出されるピン
を備える請求項2又は3記載の射出成形装置。
4. A resin flow control device comprising: a hydraulic piston;
4. The injection molding apparatus according to claim 2, further comprising a pin that is operated by a hydraulic piston and protrudes into the resin flow path.
JP2000399755A 2000-12-28 2000-12-28 Method and apparatus for injection molding Pending JP2002200649A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5882533B1 (en) * 2014-11-25 2016-03-09 ファンテック株式会社 Multi-cavity injection molding method and mold
CN107030987A (en) * 2016-12-30 2017-08-11 深圳市银宝山新科技股份有限公司 Cold runner cast gate noticeable degree system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5882533B1 (en) * 2014-11-25 2016-03-09 ファンテック株式会社 Multi-cavity injection molding method and mold
WO2016084134A1 (en) * 2014-11-25 2016-06-02 ファンテック株式会社 Multi-piece injection molding method and mold
CN106660245A (en) * 2014-11-25 2017-05-10 Fantec株式会社 Multi-piece injection molding method and mold
CN107030987A (en) * 2016-12-30 2017-08-11 深圳市银宝山新科技股份有限公司 Cold runner cast gate noticeable degree system

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