JPH0773860B2 - Molding die equipment - Google Patents

Molding die equipment

Info

Publication number
JPH0773860B2
JPH0773860B2 JP2122452A JP12245290A JPH0773860B2 JP H0773860 B2 JPH0773860 B2 JP H0773860B2 JP 2122452 A JP2122452 A JP 2122452A JP 12245290 A JP12245290 A JP 12245290A JP H0773860 B2 JPH0773860 B2 JP H0773860B2
Authority
JP
Japan
Prior art keywords
molded product
weld line
molding die
cavity
rotating piece
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
Application number
JP2122452A
Other languages
Japanese (ja)
Other versions
JPH0416320A (en
Inventor
修 浜田
Original Assignee
修 浜田
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 修 浜田 filed Critical 修 浜田
Priority to JP2122452A priority Critical patent/JPH0773860B2/en
Publication of JPH0416320A publication Critical patent/JPH0416320A/en
Publication of JPH0773860B2 publication Critical patent/JPH0773860B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0031—Movable mould wall parts in contact with weld lines, e.g. rotating pins for stirring the weld line
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0039—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks intermixing the injected material front at the weld line, e.g. by applying vibrations to the melt front
    • 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
    • B29C45/26—Moulds
    • B29C45/2628—Moulds with mould parts forming holes in or through the moulded article, e.g. for bearing cages

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− 本発明は成形金型装置に関し、さらに詳しくは成形品に
おけるウェルドライン（縫合線）部分の補強に適した成
形金型装置に関する。TECHNICAL FIELD The present invention relates to a molding die apparatus, and more particularly to a molding die apparatus suitable for reinforcing a weld line (sew line) portion of a molded product.

−従来の技術− 射出成形品、とくに、第４図に示されているようなカー
ドのような板状物（ａ）で穴（ｂ）や窓孔をもつものの
場合には、その表面に筋目状のウェルドライン（ｗ）が
発生する。このウェルドラインは成形品の外観を損うば
かりか、成形品の強度の低下を来たすことからこのウェ
ルドラインを除去すること、あるいは補強することが必
要となっている。このウェルドラインを目立たなくする
ことは可能であるが、この部分の強度を補強、増強する
ことはきわめて困難である。-Prior Art-In the case of an injection-molded product, particularly a plate-like material (a) having a hole (b) or a window as shown in FIG. -Shaped weld line (w) is generated. Since this weld line not only impairs the appearance of the molded product but also reduces the strength of the molded product, it is necessary to remove or reinforce the weld line. It is possible to make this weld line inconspicuous, but it is extremely difficult to reinforce and increase the strength of this portion.

とくに、液晶ポリマの成形品は多くの特長をもちながら
ウェルドライン部分の強度が他の部分に比較すると数分
の一となる。液晶ポリマは分子配向性がきわめて高く、
ウェルドライン部分では樹脂の流れに直交する方向に強
く配向するために、その部分が極端に弱くなっている。In particular, the molded product of liquid crystal polymer has many features, but the strength of the weld line part is a fraction of that of other parts. Liquid crystal polymers have extremely high molecular orientation,
Since the weld line portion is strongly oriented in the direction orthogonal to the resin flow, that portion is extremely weak.

その対策として、即ち、ウェルドライン部分の強度を増
大させるために、射出機構のノズルからの射出を制御し
たり、強度に影響を与えない位置にゲートを設けたり、
さらには、樹脂流路の肉厚を変えるなど色々工夫されて
いる。As a countermeasure, that is, in order to increase the strength of the weld line portion, the injection from the nozzle of the injection mechanism is controlled, or a gate is provided at a position that does not affect the strength,
Furthermore, various measures have been taken such as changing the wall thickness of the resin flow path.

しかしながら、成形品のウェルドラインを視覚上は除去
することができても強度上の問題を解決するものとはな
っていない。However, even if the weld line of the molded product can be removed visually, it does not solve the problem of strength.

−発明が解決しようとする課題− 射出成形品、とくに、カードのような板状物で穴や窓孔
のある成形品の場合、ゲートからキャビティ内に供給さ
れる溶融樹脂の流れにより筋目状のウェルドラインが形
成される。-Problems to be Solved by the Invention-In the case of an injection-molded product, particularly a molded product such as a card having a hole or a window, a streak-like pattern is formed by the flow of the molten resin supplied from the gate into the cavity. A weld line is formed.

このようなウェルドラインが成形品の表面に形成される
ことは、筋目状のウェルドラインのために成形品の強度
が低下したものになるほか、外観の体裁を損うものにな
っている。The formation of such a weld line on the surface of the molded product not only reduces the strength of the molded product due to the streak-shaped weld line, but also impairs the appearance.

−課題を解決するための手段− 本発明は上述のような問題を解決するために、成形品に
ウエルドラインが発生する位置に対応した金型の一方あ
るいは両方のキャビティ中に、キャビティ表面の一部を
構成しかつ定位置で回転される回転駒を配置し、キャビ
ティ表面の樹脂を撹拌して分子配向による脆弱を防止す
るものである。-Means for Solving the Problems-In order to solve the above problems, the present invention provides a cavity surface of one or both molds corresponding to a position where a weld line is generated in a molded product. A rotating piece that constitutes a part and is rotated at a fixed position is arranged, and the resin on the cavity surface is agitated to prevent fragility due to molecular orientation.

−作 用− 穴や、窓孔のある成形品のようなものにおいては、ゲー
トから供給される射出材料の流れが穴や、窓孔部分で２
分され、その下流で合流されるので、同部の材料樹脂の
分配配向が極めて強いけれども、射出材料の流れの表面
を過流状態とできるため、分子配向を緩和して局部的な
脆弱部の発生を防止できる。-Operation- In the case of molded products with holes or windows, the flow of injection material supplied from the gate is
Since it is divided and merged at the downstream side, the distribution orientation of the material resin in the same part is extremely strong, but since the surface of the injection material flow can be made into a superfluid state, the molecular orientation is relaxed and the local fragile part Occurrence can be prevented.

−実 施 例− 以下、本発明の実施例を添付した図面に沿って説明す
る。-Examples-Examples of the present invention will be described below with reference to the accompanying drawings.

これらの図において符号（１）は穴（２）をもつ板状の
成形品を示し、この成形品（１）を射出成形するための
金型装置（10）は上型（11）、下型（12）により構成さ
れており、両型の間にキャビティ（13）が形成される。In these drawings, reference numeral (1) indicates a plate-shaped molded product having a hole (2), and a mold device (10) for injection molding this molded product (1) includes an upper mold (11) and a lower mold. (12), and a cavity (13) is formed between the two molds.

このキャビティ（13）に対して射出材料を供給するゲー
ト（14）が下型に設けられており、このゲート（14）と
離れていて、射出材料が分流して再び合流する位置、言
換えると、成形品（１）における（Ｘ）点に相当するキ
ャビティ（13）に臨んで回転駒（15）が回転軸（16）に
より上型（11）、あるいは下型（12）の両方あるいは片
側に設けられている。A gate (14) for supplying the injection material to the cavity (13) is provided in the lower mold, and is separated from the gate (14), and the injection material is branched and merged again. , The rotary piece (15) faces the cavity (13) corresponding to the point (X) in the molded product (1) by the rotary shaft (16) on both or one side of the upper mold (11) or the lower mold (12). It is provided.

この回転駒（15）は射出工程中は強制的に回転させられ
るもので、油圧シリンダ（21）によりラック（22）を駆
動して回転軸（16）に設けたピニオン（23）を回転させ
ることでキャビティ（13）中の射出材料を撹拌する。The rotating piece (15) is forcibly rotated during the injection process, and the rack (22) is driven by the hydraulic cylinder (21) to rotate the pinion (23) provided on the rotating shaft (16). Stir the injection material in the cavity (13) with.

この回転駒（15）をキャビティ（13）の上下に設けた場
合、その回転駒（15）の回転方向は同一方向、あるいは
反対方向の何れであってもよく、回転のタイミングがよ
ければ90度の回転でもよい。また、回転駒（15A）を片
側だけに設けた金型においては反回転駒（15B）の側に
ウェルドラインが若干発生するが回転駒（15A）の跡は
発生しないので成形品によっては有効である。When the rotating piece (15) is provided above and below the cavity (13), the rotating pieces (15) may be rotated in the same direction or in opposite directions. May be rotated. In addition, in a mold in which the rotating piece (15A) is provided on only one side, a slight weld line is generated on the side opposite the rotating piece (15B), but no trace of the rotating piece (15A) is generated, so it is effective depending on the molded product. is there.

この回転駒（15A）の回転により発生する射出材料の流
れは第３図（Ａ），（Ｂ），（Ｃ）に示すように、ワイ
ゼンベルグ効果により回転駒（15A）の中心に向って流
れやすく、表面と中心部とが複雑に渦状に入り込んだベ
ニヤ板状の組織となり、とくに引張強度が増大したもの
になる。The flow of the injection material generated by the rotation of the rotating piece (15A) easily flows toward the center of the rotating piece (15A) by the Weisenberg effect, as shown in FIGS. 3 (A), (B) and (C). , The surface and the central part are intricately vortexed to form a veneer-plate-like structure, and especially the tensile strength is increased.

なお、回転駒（15A）の駆動方式としては前記油圧シリ
ンダだけでなく、油圧モータや、パルスモータにより回
転駒（15A）を回転させたりすることができ、回転タイ
ミングは射出機構におけるスクリュウの位置により、ま
た、成形型の圧力あるいは、温度を検出することで回転
駒（15A）を起動し、タイマなどでその回転を停止させ
るように制御することができる。The rotating piece (15A) can be driven not only by the hydraulic cylinder but also by rotating the rotating piece (15A) with a hydraulic motor or a pulse motor. The rotation timing depends on the position of the screw in the injection mechanism. Also, the rotation piece (15A) can be activated by detecting the pressure or the temperature of the molding die, and the rotation can be controlled to be stopped by a timer or the like.

−発明の効果− 以上の説明から明らかなように、本発明の成形金型装置
は、ウェルドラインが発生する位置に対応して金型に回
転駒あるいは回転ピンなどの撹拌手段を備えて構成した
から、成形品のウェルドライン部分は渦状の入り込んだ
組織となって、強度の大きいものが得られるなどの効果
がある。-Effects of the Invention-As is clear from the above description, the molding die apparatus of the present invention is configured such that the die is provided with a stirring means such as a rotating piece or a rotating pin corresponding to the position where the weld line is generated. Therefore, the weld line portion of the molded product has a vortex-like structure, which is advantageous in that a strong product can be obtained.

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

第１図はウェルドラインの発生し易い成形品の斜面図、
第２図は本発明の成形金型装置の断面図、第３図は本発
明に得た成形品におけるウェルドライン部分の変化説明
図、第４図は従来金型装置により得た成形品の説明図で
ある。 １……成形品、２……穴 10……成形金型装置 11……上型、12……下型 13……キャビティ、14……ゲート 15A……回転駒、16……回転軸 21……油圧シリンダ、22……ラック 23……ピニオンFig. 1 is a perspective view of a molded product where weld lines are likely to occur.
FIG. 2 is a cross-sectional view of a molding die apparatus of the present invention, FIG. 3 is an explanatory view of changes in a weld line portion of a molded article obtained by the present invention, and FIG. 4 is an explanation of a molded article obtained by a conventional die apparatus. It is a figure. 1 …… Molded product, 2 …… Hole 10 …… Molding die device 11 …… Upper mold, 12 …… Lower mold 13 …… Cavity, 14 …… Gate 15A …… Rotating piece, 16 …… Rotating shaft 21… … Hydraulic cylinder, 22… Rack 23… Pinion

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】成形品にウエルドラインが発生する位置に
対応した金型の一方あるいは両方のキャビティ中に、キ
ャビティ表面の一部を構成しかつ定位置で回転される回
転駒を配置し、キャビティ表面の樹脂を撹拌して分子配
向による脆弱を防止することを特徴とする成形金型装
置。1. A cavity is provided in one or both cavities of a mold corresponding to a position where a weld line is generated in a molded article, and a rotary piece which constitutes a part of the cavity surface and is rotated at a fixed position. A molding die device characterized by stirring resin on the surface to prevent brittleness due to molecular orientation.
JP2122452A 1990-05-10 1990-05-10 Molding die equipment Expired - Lifetime JPH0773860B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2122452A JPH0773860B2 (en) 1990-05-10 1990-05-10 Molding die equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2122452A JPH0773860B2 (en) 1990-05-10 1990-05-10 Molding die equipment

Publications (2)

Publication Number Publication Date
JPH0416320A JPH0416320A (en) 1992-01-21
JPH0773860B2 true JPH0773860B2 (en) 1995-08-09

Family

ID=14836198

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2122452A Expired - Lifetime JPH0773860B2 (en) 1990-05-10 1990-05-10 Molding die equipment

Country Status (1)

Country Link
JP (1) JPH0773860B2 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06155535A (en) * 1992-11-20 1994-06-03 Mitsubishi Gas Chem Co Inc Molding method of thermoplastic resin
DE59405377D1 (en) * 1993-12-17 1998-04-09 Huber+Suhner Ag Process for processing thermoplastically processable polymers using injection molding technology
JP2013082116A (en) * 2011-10-07 2013-05-09 Fuji Seiko:Kk Injection molding device
JP5244256B1 (en) * 2012-12-25 2013-07-24 日進工業株式会社 Injection molding method and injection molded product
JP5270792B2 (en) * 2012-12-28 2013-08-21 株式会社富士精工 Injection molding equipment
JP6081826B2 (en) * 2013-03-07 2017-02-15 トヨタ自動車九州株式会社 Injection molding method and injection molding apparatus
JP6074683B2 (en) * 2013-04-15 2017-02-08 パナソニックＩｐマネジメント株式会社 Resin molding method
EP3148765A1 (en) * 2014-05-30 2017-04-05 Mahle International GmbH Device and method for fibre injection moulding of injection moulded parts
TWI750105B (en) * 2016-12-15 2021-12-11 日商住友化學股份有限公司 Method for producing a plate-like molded product, mold
CN115214098A (en) * 2022-07-20 2022-10-21 安徽康宏精密制造有限公司 Precise injection molding part manufacturing device and manufacturing method thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53110658A (en) * 1977-03-08 1978-09-27 Seikosha Kk Process and apparatus for molding plastic form
JPS57111526U (en) * 1980-12-27 1982-07-09
JPS61291113A (en) * 1985-06-20 1986-12-20 Mitsubishi Metal Corp Injection molded product

Also Published As

Publication number Publication date
JPH0416320A (en) 1992-01-21

Similar Documents

Publication Publication Date Title
JPH0773860B2 (en) Molding die equipment
KR910016458A (en) Composite molding method and particularly recommended mold for carrying out the method
US5244378A (en) Apparatus for dynamic gating of polymers for producing molded articles with isotropic properties
KR200394900Y1 (en) Injection molding machaine having a needle gate
US7767119B2 (en) Gas injecting device of cylinder for injection molding machine, and method for controlling amount of gas injected into barrel of injection molding machine
JPH047977B2 (en)
JPH0558377B2 (en)
SU1565718A1 (en) Casting mould for making polymeric articles
KR200334472Y1 (en) Rotation apparatus of vertical type catapult
JPH06315955A (en) Method and apparatus for injection molding without causing visible sink mark on product
JP2002187177A (en) Method for manufacturing injection compression molded article
JPH03190714A (en) Two-color molding die
JPH07276434A (en) Injection molding device
JPH05329866A (en) Injection molding method
JPH10286831A (en) Insert molding die
JP2677142B2 (en) Core pin structure of injection mold
JPS63237919A (en) Molding method for thick front cabinet for picture indicator and molding mold
JP2001088164A (en) Electric injection molding machine for double molding
JP3472886B2 (en) Injection molding method and injection molding device
JPH10264213A (en) Injection mold and injection molding method
GB2321424A (en) A moulding apparatus with means to stir flow fronts meeting in use
JP3387956B2 (en) Hollow molded body
Meijer Multilayer Injection Moulding, a Preliminary Study: the Flow Between Two Plungers
JPH10315287A (en) Toggle type mold clamping device for injection molding machine
JPH07290512A (en) Injection molding method and injection mold device to be used therefor