JP2000301583A - Method for injection-compression molding of member of complicated shape precisely, and injection/compression molding device for practicing the method - Google Patents

Method for injection-compression molding of member of complicated shape precisely, and injection/compression molding device for practicing the method

Info

Publication number
JP2000301583A
JP2000301583A JP11110482A JP11048299A JP2000301583A JP 2000301583 A JP2000301583 A JP 2000301583A JP 11110482 A JP11110482 A JP 11110482A JP 11048299 A JP11048299 A JP 11048299A JP 2000301583 A JP2000301583 A JP 2000301583A
Authority
JP
Japan
Prior art keywords
cavity
movable
molded product
molten resin
thickness
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
JP11110482A
Other languages
Japanese (ja)
Inventor
Hirofumi Yoshimitsu
洋文 善光
Masahiko Yamaki
政彦 山喜
Katsuyuki Morita
勝幸 盛田
Hideto Ogasawara
英人 小笠原
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.)
Mitsui Chemicals Inc
Original Assignee
Mitsui Chemicals Inc
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 Mitsui Chemicals Inc filed Critical Mitsui Chemicals Inc
Priority to JP11110482A priority Critical patent/JP2000301583A/en
Publication of JP2000301583A publication Critical patent/JP2000301583A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/46Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating
    • B29C45/77Measuring, controlling or regulating of velocity or pressure of moulding material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76003Measured parameter
    • B29C2945/76006Pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76177Location of measurement
    • B29C2945/76254Mould
    • B29C2945/76257Mould cavity

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for manufacturing a molded product of a complicated shape having thickness differences with high accuracy and without generating a weldline or the like. SOLUTION: A mold device used in this method comprises a cavity 1 having an almost equal thickness (d) corresponding to the thickness of a thick wall part of a molded product and a plurality of movable cores 4A-4C which are installed so as to independently proceed into and recede from the cavity 1 at positions corresponding to the thin wall part of the molded product and have their own outer shapes corresponding to the recessed part shape of the thin wall part of the molding. In this method, a step to retain the movable cores 4A-4C at their respective receding positions and thereby make the entire cavity 1 almost equally thick (d): a step to fill a molten resin 8 from the specified spots (2a) of the cavity 1: a step to detect the fluid state of the molten resin 8 in the cavity 1 and independently move each of the movable cores 4A-4C forward sequentially into the cavity 1 from a region filled with a resin and further, retain the movable cores 4A-4C at their respective advance positions to demarcate the shapes of molds for the thin wall parts one by one: and a step to unload the molded product after the lapse of a specified cooling time, are performed in that order.

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、射出圧縮成形方法
及びその方法を実施する装置に関し、特に、形状の複雑
な部材を精密に射出圧縮成形する方法及びこれを実施す
るための射出圧縮成形装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection compression molding method and an apparatus for performing the method, and more particularly to a method for precisely injection compression molding a member having a complicated shape and an injection compression molding apparatus for performing the method. About.

【0002】[0002]

【従来の技術】プラスチック成形方法のひとつである射
出成形では、成形機で溶融混練した高温の樹脂を金型内
の成形空間(キャビテイ)に流し込み、金型内で冷却固
化することにより、プラスチックを所定の形状に賦形す
る。従って、厚い部分と薄い部分が多数存在する複雑な
形状の成形品を成形する場合、これにあわせて、キヤビ
ティに複雑な凹凸のある金型を用いる必要がある。しか
しながら、このように複雑な凹凸を有するキャビティに
樹脂を注入した場合、厚肉部を通過した樹脂は、薄肉部
(型内の凸部)を回りこんで流動するため、樹脂と樹脂
が再度合流する部分(ウェルド)に、樹脂密度の低い部
分ができ、外観不良(ウェルドラインの発生)や、成形
品強度の低下、成形品の反り、ひけなどの精度低下を引
き起こすという問題がある。これらの傾向は、繊維やフ
ィラーを充填した樹脂を用いた場合に、特に顕著とな
る。
2. Description of the Related Art In injection molding, which is one of plastic molding methods, a high-temperature resin melted and kneaded by a molding machine is poured into a molding space (cavity) in a mold, and cooled and solidified in the mold to form the plastic. Form into a predetermined shape. Accordingly, when molding a molded article having a complicated shape in which a large number of thick portions and thin portions exist, it is necessary to use a mold having a complicated unevenness in cavities. However, when the resin is injected into the cavity having such complicated irregularities, the resin that has passed through the thick portion flows around the thin portion (the convex portion in the mold) and flows again. There is a problem that a portion having a low resin density is formed in a portion to be welded (weld), which causes poor appearance (generation of a weld line), a decrease in strength of a molded product, and a decrease in accuracy such as warpage and sink of a molded product. These tendencies become particularly remarkable when a resin filled with fibers or fillers is used.

【0003】[0003]

【発明が解決しようとする課題】本発明は、上記の問題
点を解決するためなされたものであり、その目的とする
ところは、厚み差のある複雑な形状の成形品を、ウェル
ドを作らず成形し、これにより外観、強度、寸法精度等
に優れた成形品を得ることのできる射出圧縮成形方法及
びこれを実施する装置を提供することにある。従って、
本発明は、例えばノート型パソコン用ハードディスクの
筐体などのように、狭いスペースに多くの部品を効率良
く組み込むための複雑な凹凸形状を有する成形品の製造
に特に有効な技術的手段を提供しようとするものであ
る。
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to form a molded article having a complicated shape having a difference in thickness without forming a weld. An object of the present invention is to provide an injection compression molding method capable of molding and thereby obtaining a molded article excellent in appearance, strength, dimensional accuracy, and the like, and an apparatus for performing the method. Therefore,
The present invention is to provide a technical means which is particularly effective for manufacturing a molded article having a complicated uneven shape for efficiently incorporating many components into a narrow space, such as a housing of a hard disk for a notebook computer. It is assumed that.

【0004】[0004]

【課題を解決するための手段】上記の目的は、成形品の
厚肉部の厚さに相当する略均等な厚さを有するキャビテ
ィと、成形品の薄肉部に対応する位置においてこのキャ
ビティ内へそれぞれ独立に進退可能なよう設けられ、そ
れぞれが成形品の薄肉部の凹部形状に対応する外面形状
を有する複数の可動コアと、を備えた金型装置を用い
て;上記複数の可動コアをすべて退行位置に保持し、キ
ャビティ全体を略均等な厚さにするステップと;キャビ
ティの所定箇所から溶融樹脂を充填するステップと;キ
ャビティ内における溶融樹脂の流動状態を検知し、樹脂
で満たされた領域から順次各可動コアをキャビティ内へ
それぞれ独立に前進させ、その前進位置に保持すること
により、薄肉部の型の形状を順次画定するステップと;
一定の冷却時間経過後に成形品を取り出すステップと;
を順次遂行することを特徴とする形状の複雑な部材を精
密に射出圧縮成形する方法によって達成できる。
SUMMARY OF THE INVENTION The object of the present invention is to provide a cavity having a substantially uniform thickness corresponding to the thickness of a thick part of a molded article and a cavity at a position corresponding to the thin part of the molded article. A plurality of movable cores, each having an outer surface shape corresponding to the concave shape of the thin portion of the molded product, provided so as to be able to advance and retreat independently of each other; Holding at the retreat position and making the entire cavity substantially uniform in thickness; filling the molten resin from a predetermined portion of the cavity; detecting the flow state of the molten resin in the cavity and filling the region with the resin Sequentially moving each movable core into the cavity independently from each other, and sequentially defining the shape of the mold of the thin-walled portion by holding the movable core at the advanced position;
Removing the molded article after a certain cooling time;
Are sequentially performed, and the method can be achieved by a method of precisely injection-compressing a complicated member having a shape characterized by the following.

【0005】また、この射出圧縮成形方法は、型を閉じ
たとき、成形品の厚肉部の厚さに相当する略均等な厚さ
を有するキャビティが形成されるよう構成された可動側
金型及び固定側金型と;成形品の薄肉部に対応する位置
において上記キャビティ内へそれぞれ独立に進退可能な
よう設けられ、それぞれが成形品の薄肉部の凹部形状に
対応する外面形状を有する複数の可動コアと;各可動コ
アに対応して設けられ、その可動コアが存在する部分の
キャビティ内に溶融樹脂が充填されたことを検出する圧
力センサーと;型の開閉動作、キャビティ内への溶融樹
脂の供給動作、複数の可動コアの進退動作、成形品の取
出し動作を統括制御する制御装置と;を備え、上記制御
装置による制御が、型を閉じ、すべての可動コアを退行
位置に保持した状態でキャビティ内に溶融樹脂を充填し
つつ、各可動コアに対応して設けた圧力センサーの出力
に基づき、樹脂で満たされた領域の可動コアをキャビテ
ィ内へ順次それぞれ独立に前進させ、その前進位置に保
持することにより薄肉部の型の形状を順次画定し、一定
の冷却時間経過後に、型開き前又は型開き後に可動コア
を後退させて成形品より抜き取り、次いで、成形品を取
り出す操作を順次遂行するよう構成されたこと;を特徴
とする射出圧縮成形装置によって好適に実施し得る。
In addition, this injection compression molding method is characterized in that, when the mold is closed, a cavity having a substantially uniform thickness corresponding to the thickness of the thick part of the molded product is formed. And a fixed mold; a plurality of molds each having an outer surface shape corresponding to the concave shape of the thin portion of the molded product, provided so as to be independently movable into and out of the cavity at a position corresponding to the thin portion of the molded product. A movable core; a pressure sensor provided corresponding to each movable core and detecting that the molten resin is filled in a cavity of a portion where the movable core is present; a mold opening / closing operation, a molten resin in the cavity A control device for controlling the supply operation of the plurality of movable cores, the advancing and retreating operations of a plurality of movable cores, and the unloading operation of a molded product; and In While filling the cavity with the molten resin, the movable cores in the region filled with resin are sequentially and independently advanced into the cavity based on the output of the pressure sensor provided corresponding to each movable core, and moved to the advanced position. By holding, the shape of the mold of the thin portion is sequentially defined, and after a certain cooling time has elapsed, before or after opening the mold, the movable core is retracted and extracted from the molded product, and then the operation of taking out the molded product is sequentially performed. It can be suitably implemented by an injection compression molding apparatus characterized by the following.

【0006】[0006]

【発明の実施の形態】以下、図面を参照しつゝ本発明を
具体的に説明する。図1は、本発明に係る射出圧縮成形
方法を実施するための装置の一実施例の要部を、そのキ
ャビティ内に溶融樹脂を充填する前の状態において示す
概略断面図、図2は、キャビティに溶融樹脂を充填する
初期の段階を概略断面図、図3は、その中期の段階を示
す概略断面図、図4は、その終期の段階を示す概略断面
図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic sectional view showing an essential part of an embodiment of an apparatus for carrying out an injection compression molding method according to the present invention in a state before a molten resin is filled in a cavity, and FIG. FIG. 3 is a schematic cross-sectional view showing an intermediate stage, and FIG. 4 is a schematic cross-sectional view showing a final stage.

【0007】図1ないし図4中、1はキャビティ、2は
固定側金型、2aは樹脂注入ゲート、3は可動側金型、
4A,4B,4Cはその先端がキャビティ1内へそれぞ
れ進退可能なよう設けられた可動コア、5A,5B,5
Cは可動コアの後端に設けた圧力センサー、6A,6
B,6Cは各可動コアを個別に進退駆動させる駆動装
置、7は装置全体の動作を統括制御する制御装置、8は
キャビティに充填される溶融樹脂である。
1 to 4, 1 is a cavity, 2 is a fixed mold, 2a is a resin injection gate, 3 is a movable mold,
Reference numerals 4A, 4B, and 4C denote movable cores, 5A, 5B, and 5 that are provided so that their tips can advance and retreat into the cavity 1, respectively.
C is a pressure sensor provided at the rear end of the movable core, 6A, 6
Reference numerals B and 6C denote driving devices for individually driving the respective movable cores to advance and retreat, reference numeral 7 denotes a control device for integrally controlling the operation of the entire device, and reference numeral 8 denotes a molten resin filled in the cavity.

【0008】固定側金型2と可動側金型3は、これを閉
じたとき、成形品の厚肉部の厚さに相当する略均等な厚
さdを有するキャビティ1が形成され、ゲート2aから
溶融樹脂が注入、充填されるように構成されている。図
示した例においては、キャビティ1の厚さdが全体にわ
たって一定なように描かれているが、急激な凹凸ではな
く緩やかに変化する程度であればdは完全に一定である
必要はなく、本発明において「略均等な厚さ」というと
きは、そのような緩やかに変化する形状をも含むもので
ある。
When the fixed mold 2 and the movable mold 3 are closed, a cavity 1 having a substantially uniform thickness d corresponding to the thickness of the thick part of the molded product is formed, and the gate 2a is formed. And the molten resin is injected and filled. In the illustrated example, the thickness d of the cavity 1 is drawn so as to be constant throughout. However, if the thickness is not abrupt irregularities but changes gradually, it is not necessary that d be completely constant. In the present invention, "substantially uniform thickness" includes such a gently changing shape.

【0009】複数の可動コア4A,4B,4Cは、それ
ぞれ成形品の薄肉部に対応する位置に設けられ、その先
端がキャビティ1内へそれぞれ独立に進退、突出可能な
ように構成されている。各可動コアの外面形状は、図示
した例においては、いずれも円筒状に描かれているが、
実際には、それぞれが成形品の薄肉部の凹部形状に対応
する形状に作製されている。具体的には、例えば成形品
の薄肉部が矩形の凹部であるときは、軸直角断面が矩形
の可動コアを用い、また、成形品の薄肉部が半月形の凹
部であるときは、軸直角断面が半月形の可動コアを用い
る。また、可動コアの頂部は、図示した例においては、
いずれも完全に平坦に描かれているが、成形品の薄肉部
となる凹部の底面に更に凹凸を設ける必要がある場合に
は、可動コアの頂部にこれと対応した凹凸を形成してお
くことは何ら差支えない。これら複数の可動コア4A,
4B,4Cは、それぞれに設けた駆動装置6A,6B,
6Cによって、それぞれ独立に進退駆動せしめ得るよう
になっている。
The plurality of movable cores 4A, 4B, 4C are provided at positions corresponding to the thin portions of the molded product, respectively, and the tips thereof can be independently advanced and retracted into and out of the cavity 1, respectively. Although the outer surface shape of each movable core is drawn in a cylindrical shape in the illustrated example,
Actually, each is formed in a shape corresponding to the concave shape of the thin portion of the molded product. Specifically, for example, when the thin portion of the molded product is a rectangular concave portion, a movable core having a rectangular section perpendicular to the axis is used, and when the thin portion of the molded product is a semilunar concave portion, A movable core having a half-moon cross section is used. Also, the top of the movable core is, in the illustrated example,
Both are drawn completely flat, but if it is necessary to provide further irregularities on the bottom surface of the concave portion that will be the thin part of the molded product, the corresponding irregularities should be formed on the top of the movable core Can be anything. These movable cores 4A,
4B and 4C are driving devices 6A, 6B,
By 6C, it is possible to independently drive forward and backward.

【0010】圧力センサー5A,5B,5Cは、それぞ
れ可動コア4A,4B,4Cの後端と適宜の固定部材と
の間に取り付けられ、キャビティ1内に溶融樹脂が注入
され、その溶融樹脂の圧力によって可動コアが押し下げ
られる方向の力が加わったとき、その圧力を検出し、こ
れが所定値に達したときは、キャビティ内の当該可動コ
アが存在する領域に溶融樹脂が充分に充填されたことを
検知し得るようになっている。なお、図示した実施例に
おいては、圧力センサー5A,5B,5Cを、可動コア
4A,4B,4Cのそれぞれの後端に取り付けたが、キ
ャビティ内に充填されてゆく溶融樹脂の圧力を検出し得
る位置であれば、その取付け箇所は適宜変更可能であ
る。
The pressure sensors 5A, 5B, 5C are mounted between the rear ends of the movable cores 4A, 4B, 4C and appropriate fixing members, respectively, and molten resin is injected into the cavity 1, and the pressure of the molten resin is increased. When a force in the direction in which the movable core is pushed down is applied, the pressure is detected, and when this pressure reaches a predetermined value, it is determined that the molten resin has been sufficiently filled in the area where the movable core is present in the cavity. It can be detected. In the illustrated embodiment, the pressure sensors 5A, 5B, 5C are attached to the rear ends of the movable cores 4A, 4B, 4C, but can detect the pressure of the molten resin filling the cavity. If it is a position, its attachment location can be changed as appropriate.

【0011】制御装置7は、予め定められたプログラム
に従い、可動側金型3の開閉動作、キャビティ1内への
溶融樹脂の供給動作、圧力センサー5A,5B,5Cの
出力に基づく可動コア4A,4B,4Cの進退動作、成
形品の取出し動作等々を統括制御する。
In accordance with a predetermined program, the control device 7 opens and closes the movable mold 3, supplies molten resin into the cavity 1, and controls the movable cores 4 A, 4 B based on the outputs of the pressure sensors 5 A, 5 B, 5 C. 4B, 4C, and the removal operation of the molded product are collectively controlled.

【0012】以下、この装置により本発明方法を実施す
るプロセスについて説明する。まず、図1に示すよう
に、可動側金型3を固定側金型2へ向けて移動させ、型
を閉じることにより、キャビティ1を形成する。このと
き、すべての可動コア4A,4B,4Cは退行させ、そ
の先端がキャビティ1内へ突出しないようにしておく。
Hereinafter, a process for carrying out the method of the present invention using this apparatus will be described. First, as shown in FIG. 1, the cavity 1 is formed by moving the movable mold 3 toward the fixed mold 2 and closing the mold. At this time, all the movable cores 4A, 4B, 4C are retracted so that their tips do not project into the cavity 1.

【0013】次いで、図2に示すように、ゲート2aか
らキャビティ内へ溶融樹脂8を充填する。溶融樹脂8
が、図示する如く、例えば可動コア4Aの存在する領域
に充分に充填されると、これが圧力センサー5Aの出力
として制御装置7において検知される。然るときは、制
御装置7は駆動装置6Aに駆動信号を送り、図3に示す
如く、可動コア4Aをキャビティ1内へ前進、突出させ
る。このとき、可動コア4Aが突出することにより画定
される成形品の薄肉部の厚さがd1であるとすれば、可
動コア4Aの先端とこれに対向するキャビティ内壁面と
の距離がd1になる位置まで可動コア4Aを突出させ、
その後、樹脂の冷却期間を通じてその突出位置を保持す
るようにする。このように、予め充填された溶融樹脂の
中へ可動コアを押し出すことにより、当該可動コアの周
囲で一種の圧縮成形が行われると共に、最初から突出さ
せた部分の後側へ溶融が回り込むことによるウェルドラ
インの発生等が防止できる。
Next, as shown in FIG. 2, a molten resin 8 is filled into the cavity from the gate 2a. Molten resin 8
As shown in the figure, for example, when the region where the movable core 4A exists is sufficiently filled, this is detected by the control device 7 as the output of the pressure sensor 5A. In that case, the control device 7 sends a drive signal to the drive device 6A, and causes the movable core 4A to advance and project into the cavity 1 as shown in FIG. At this time, if the thickness of the thin portion of the molded product defined by the protrusion of the movable core 4A is d1, the distance between the tip of the movable core 4A and the cavity inner wall surface opposed thereto becomes d1. The movable core 4A is projected to the position,
Thereafter, the projecting position is maintained throughout the cooling period of the resin. In this way, by extruding the movable core into the pre-filled molten resin, a kind of compression molding is performed around the movable core, and the melt wraps around the portion protruding from the beginning. Weld lines can be prevented from occurring.

【0014】以下同様に、可動コア4Bの領域に溶融樹
脂8が充填された時点で可動コア4Bを突出させ、可動
コア4Cの領域に溶融樹脂8が充填された時点で可動コ
ア4Cを突出させる。その場合、成形品の薄肉部の厚さ
d2、d3に適合するよう、図4に示す如く、可動コア
4B、4Cの先端とキャビティ内壁面との距離がd2、
d3となった位置で可動コアの前進動作を停止し、樹脂
の冷却期間中その突出位置を保持するようにする。この
ように、可動コア4A,4B,4Cをそれぞれ個別に駆
動し、それぞれの領域に溶融樹脂が充填される都度、そ
れぞれの可動コアを他の可動コアとはタイミングをずら
せて独立に突出させることにより、キャビティ1全体に
溶融樹脂が充填されてから可動コア4A,4B,4Cを
同時に突出させるときに生じるような溶融樹脂の流動制
限を回避でき、均質で高精度の成形品を得ることが可能
となるものである。
Similarly, when the molten resin 8 is filled in the area of the movable core 4B, the movable core 4B is made to protrude, and when the area of the movable core 4C is filled with the molten resin 8, the movable core 4C is made to project. . In this case, as shown in FIG. 4, the distance between the tip of the movable cores 4B, 4C and the inner wall surface of the cavity is d2, so as to conform to the thickness d2, d3 of the thin portion of the molded product.
The forward movement of the movable core is stopped at the position of d3, and the projecting position is maintained during the cooling period of the resin. As described above, the movable cores 4A, 4B, and 4C are individually driven, and each time the respective regions are filled with the molten resin, the respective movable cores are made to protrude independently at a different timing from the other movable cores. Thereby, it is possible to avoid the flow restriction of the molten resin which occurs when the movable cores 4A, 4B, 4C are simultaneously projected after the entire cavity 1 is filled with the molten resin, and it is possible to obtain a uniform and high-precision molded product. It is what becomes.

【0015】その後、所定の冷却時間を経た後、可動側
金型3を開く前(直前)又は開いた後に可動コア4A,
4B,4Cを後退させて成形品より抜き出す。次いで、
図では省略したイジェクターピン等を作動させて金型よ
り成形品を取り出す。型開きの前又は型開き後に可動コ
アを後退させることにより、金型から成形品を取り出す
際の離型抵抗を減少させることができ、成形品の取出し
時に発生する反り、変形等を防止することが可能とな
る。また、成形品を突き出すためのイジェクターピン等
の数を削減できるメリットもある。
Then, after a predetermined cooling time, before (immediately before) or after opening the movable mold 3, the movable cores 4 A, 4 A,
4B and 4C are retracted and extracted from the molded product. Then
The molded product is removed from the mold by operating an ejector pin or the like, which is omitted in the drawing. By retracting the movable core before or after opening the mold, it is possible to reduce mold release resistance when removing the molded product from the mold, and to prevent warpage or deformation that occurs when removing the molded product. Becomes possible. In addition, there is an advantage that the number of ejector pins for projecting a molded product can be reduced.

【0016】[0016]

【発明の効果】本発明は、上記の如く構成されるから、
本発明によるときは、厚み差のある複雑な成形品をウェ
ルドを作らず成形し、これにより外観、強度、寸法精度
に優れた成形品を得ることのできる射出圧縮成形方法及
びこれを実施する装置を提供し得るものであり、例え
ば、ノート型パソコン用ハードディスクの筐体などのよ
うに狭いスペースに多くの部品を効率良く組み込むため
の複雑な凹凸形状を有する成形品の製造に特に好適な技
術的手段を提供し得る。
The present invention is configured as described above,
According to the present invention, an injection compression molding method capable of molding a complicated molded article having a thickness difference without forming a weld, thereby obtaining a molded article having excellent appearance, strength, and dimensional accuracy, and an apparatus for performing the same. For example, a technical technique particularly suitable for manufacturing a molded article having a complicated uneven shape for efficiently incorporating many components in a narrow space such as a housing of a hard disk for a notebook computer. Means may be provided.

【0017】なお、本発明は上記実施例に限定されるも
のでなく、その目的の範囲内において上記の説明から当
業者が容易に想到し得るすべての変更実施例を包摂する
ものである。
It should be noted that the present invention is not limited to the above embodiment, but encompasses all modified embodiments that can be easily conceived by those skilled in the art from the above description within the scope of the object.

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

【図1】本発明に係る射出圧縮成形方法を実施するため
の装置の一実施例の要部を、そのキャビティ内に溶融樹
脂を充填する前の状態において示す概略断面図である。
FIG. 1 is a schematic cross-sectional view showing a main part of an embodiment of an apparatus for carrying out an injection compression molding method according to the present invention before a cavity is filled with a molten resin.

【図2】キャビティに溶融樹脂を充填する初期の段階を
概略断面図である。
FIG. 2 is a schematic cross-sectional view showing an initial stage of filling a cavity with a molten resin.

【図3】その中期の段階を示す概略断面図である。FIG. 3 is a schematic sectional view showing the middle stage.

【図4】その終期の段階を示す概略断面図である。FIG. 4 is a schematic sectional view showing the final stage.

【符号の説明】[Explanation of symbols]

1 キャビティ 1a ゲート 2 固定側金型 3 可動側金型 4A〜4C 可動コア 5A〜5C 圧力センサー 6A〜6C 駆動装置 7 制御装置 8 溶融樹脂 Reference Signs List 1 cavity 1a gate 2 fixed mold 3 movable mold 4A-4C movable core 5A-5C pressure sensor 6A-6C drive device 7 control device 8 molten resin

フロントページの続き (72)発明者 盛田 勝幸 愛知県名古屋市南区丹後通2丁目1番地 三井化学株式会社内 (72)発明者 小笠原 英人 愛知県名古屋市南区丹後通2丁目1番地 三井化学株式会社内 Fターム(参考) 4F206 AM36 JA03 JM04 JN14 JQ81Continuation of front page (72) Inventor Katsuyuki Morita 2-1-1 Tango-dori, Minami-ku, Nagoya-shi, Aichi Mitsui Chemicals Co., Ltd. (72) Inventor Hideto Ogasawara 2-1-1 Tango-dori, Minami-ku, Nagoya-shi, Aichi Mitsui Chemicals Co., Ltd. F-term (reference) 4F206 AM36 JA03 JM04 JN14 JQ81

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】成形品の厚肉部の厚さに相当する略均等な
厚さ(d)を有するキャビティ(1)と、成形品の薄肉
部に対応する位置においてこのキャビティ内へそれぞれ
独立に進退可能なよう設けられ、それぞれが成形品の薄
肉部の凹部形状に対応する外面形状を有する複数の可動
コア(4A〜4C)と、を備えた金型装置を用いて;上
記複数の可動コア(4A〜4C)をすべて退行位置に保
持し、キャビティ全体を略均等な厚さ(d)にするステ
ップと;キャビティの所定箇所(2a)から溶融樹脂
(8)を充填するステップと;キャビティ内における溶
融樹脂(8)の流動状態を検知し、樹脂で満たされた領
域から順次各可動コアをキャビティ内へそれぞれ独立に
前進させ、その前進位置に保持することにより、薄肉部
の型の形状を順次画定するステップと;一定の冷却時間
経過後に成形品を取り出すステップと;を順次遂行する
ことを特徴とする形状の複雑な部材を精密に射出圧縮成
形する方法。
1. A cavity (1) having a substantially uniform thickness (d) corresponding to the thickness of a thick part of a molded article, and a cavity (1) having a thickness corresponding to the thin part of the molded article, and independently into the cavity. A plurality of movable cores (4A to 4C) provided so as to be able to advance and retreat, each having an outer surface shape corresponding to the concave shape of the thin portion of the molded product; (4A to 4C) at the retreat position to make the entire cavity substantially uniform in thickness (d); filling the molten resin (8) from a predetermined position (2a) of the cavity; The flow state of the molten resin (8) in the above is detected, and each movable core is sequentially advanced independently from the region filled with the resin into the cavity, and the movable core is held at the advanced position, whereby the shape of the mold of the thin portion is changed. Define sequentially Step a: method for precisely injection compression molding a complex-shaped members, characterized by sequentially performing; a step removing the molded article after a certain cooling time.
【請求項2】型を閉じたとき、成形品の厚肉部の厚さに
相当する略均等な厚さ(d)を有するキャビティ(1)
が形成されるよう構成された可動側金型(2)及び固定
側金型(3)と;成形品の薄肉部に対応する位置におい
て上記キャビティ内へそれぞれ独立に進退可能なよう設
けられ、それぞれが成形品の薄肉部の凹部形状に対応す
る外面形状を有する複数の可動コア(4A〜4C)と;
各可動コアに対応して設けられ、その可動コアが存在す
る部分のキャビティ内に溶融樹脂が充填されたことを検
出する圧力センサー(5A〜5C)と;型の開閉動作、
キャビティ内への溶融樹脂の供給動作、複数の可動コア
の進退動作、成形品の取出し動作を統括制御する制御装
置(7)と;を備え、上記制御装置(7)による制御
が、型(2,3)を閉じ、すべての可動コア(4A〜4
C)を退行位置に保持した状態でキャビティ(1)内に
溶融樹脂(8)を充填しつつ、各可動コアに対応して設
けた圧力センサー(5A〜5C)の出力に基づき、樹脂
で満たされた領域の可動コアをキャビティ内へ順次それ
ぞれ独立に前進させ、その前進位置に保持することによ
り薄肉部の型の形状を順次画定し、一定の冷却時間経過
後に、型開き前又は型開き後に可動コアを後退させて成
形品より抜き取り、次いで、成形品を取り出す操作を順
次遂行するよう構成されたこと;を特徴とする射出圧縮
成形装置。
2. A cavity (1) having a substantially uniform thickness (d) corresponding to the thickness of the thick part of the molded product when the mold is closed.
And a movable-side mold (2) and a fixed-side mold (3), which are formed so as to be formed in the cavity at positions corresponding to the thin-walled portions of the molded article, respectively. A plurality of movable cores (4A to 4C) having an outer surface shape corresponding to the concave shape of the thin portion of the molded product;
Pressure sensors (5A to 5C) provided corresponding to the respective movable cores and detecting that a molten resin is filled in a cavity of a portion where the movable cores are present;
A control device (7) for controlling the supply operation of the molten resin into the cavity, the advancing and retreating operations of the plurality of movable cores, and the unloading operation of the molded product; , 3) and all movable cores (4A-4
While the cavity (1) is filled with the molten resin (8) in a state where C) is held at the retreat position, the cavity (1) is filled with the resin based on the outputs of the pressure sensors (5A to 5C) provided corresponding to the respective movable cores. The movable core in the region is sequentially and independently advanced into the cavity, and the shape of the thin-walled part is sequentially defined by holding the movable core in the advanced position, and after a certain cooling time has elapsed, before or after opening the mold. An injection compression molding apparatus characterized in that the movable core is retracted and extracted from the molded article, and then the operations of removing the molded article are sequentially performed;
JP11110482A 1999-04-19 1999-04-19 Method for injection-compression molding of member of complicated shape precisely, and injection/compression molding device for practicing the method Pending JP2000301583A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11110482A JP2000301583A (en) 1999-04-19 1999-04-19 Method for injection-compression molding of member of complicated shape precisely, and injection/compression molding device for practicing the method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11110482A JP2000301583A (en) 1999-04-19 1999-04-19 Method for injection-compression molding of member of complicated shape precisely, and injection/compression molding device for practicing the method

Publications (1)

Publication Number Publication Date
JP2000301583A true JP2000301583A (en) 2000-10-31

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Application Number Title Priority Date Filing Date
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Country Link
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NL1032519C2 (en) * 2006-09-15 2008-03-18 Ecim Technologies Bv Device and method for the manufacture of products.
EP2052835A1 (en) * 2007-10-26 2009-04-29 Rieter Technologies AG Injection moulding method and apparatus
CN102267214A (en) * 2010-06-07 2011-12-07 松下电器产业株式会社 Resin molding method, die device, and resin molded article
US9180615B2 (en) 2011-09-22 2015-11-10 Sabic Global Technologies B.V. Method of making a multiple-layered plastic part
WO2017004299A1 (en) * 2015-06-30 2017-01-05 iMFLUX Inc. Sequential coining
GB2542711A (en) * 2015-09-25 2017-03-29 Gr8 Eng Ltd Injection moulding method
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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1032519C2 (en) * 2006-09-15 2008-03-18 Ecim Technologies Bv Device and method for the manufacture of products.
WO2008033025A2 (en) * 2006-09-15 2008-03-20 Ecim Technologies B.V. Apparatus and method for the manufacture of products
WO2008033025A3 (en) * 2006-09-15 2008-10-16 Ecim Technologies Bv Apparatus and method for the manufacture of products
EP2052835A1 (en) * 2007-10-26 2009-04-29 Rieter Technologies AG Injection moulding method and apparatus
WO2009052645A1 (en) * 2007-10-26 2009-04-30 Rieter Technologies Ag Injection moulding method and apparatus.
US8668862B2 (en) 2010-06-07 2014-03-11 Panasonic Corporation Resin molding method, die device, and resin molded article
CN102267214A (en) * 2010-06-07 2011-12-07 松下电器产业株式会社 Resin molding method, die device, and resin molded article
US9180615B2 (en) 2011-09-22 2015-11-10 Sabic Global Technologies B.V. Method of making a multiple-layered plastic part
US9815260B2 (en) 2011-09-22 2017-11-14 Sabic Global Technologies B.V. Thick plastic part and method of making and tool
WO2017004299A1 (en) * 2015-06-30 2017-01-05 iMFLUX Inc. Sequential coining
US20170001346A1 (en) * 2015-06-30 2017-01-05 iMFLUX Inc. Sequential coining
GB2542711A (en) * 2015-09-25 2017-03-29 Gr8 Eng Ltd Injection moulding method
GB2542711B (en) * 2015-09-25 2019-04-10 Gr8 Eng Ltd Injection moulding method
KR102153503B1 (en) * 2020-03-26 2020-09-10 조근행 Electronic distributing box manufacturing method using moulding device and electronic distributing box as institutionalized by this method of manufacture

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