JP3480115B2 - Injection molding apparatus and injection molding method using the same - Google Patents
Injection molding apparatus and injection molding method using the sameInfo
- Publication number
- JP3480115B2 JP3480115B2 JP09618195A JP9618195A JP3480115B2 JP 3480115 B2 JP3480115 B2 JP 3480115B2 JP 09618195 A JP09618195 A JP 09618195A JP 9618195 A JP9618195 A JP 9618195A JP 3480115 B2 JP3480115 B2 JP 3480115B2
- Authority
- JP
- Japan
- Prior art keywords
- injection molding
- mold
- wavelength resonator
- movable mold
- resonance
- 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means 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
- B29C45/568—Applying vibrations to the mould parts
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
【０００１】[0001]
【産業上の利用分野】本発明は射出成形装置およびそれ
を用いた射出成形方法に関する。さらに詳しくは、薄肉
の成形品の成形に特に有用な射出成形装置およびそれを
用いた射出成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding apparatus and an injection molding method using the same. More specifically, the present invention relates to an injection molding device particularly useful for molding a thin molded product and an injection molding method using the same.
【０００２】[0002]
【従来の技術】成形材料の射出成形を行なう場合、特に
成形品の肉厚が１．２〜１．３［ｍｍ］以下となる場
合、さまざまな不良現象が発生するため、通常の射出成
形方法では成形が困難であった。このような不良現象の
例としては、残留応力によるソリや変形，光学歪み，ヒ
ケ，ウエルドライン，バリ，フローマーク，転写ムラ，
偏肉による光沢不良等がある。成形材料の流動性を良く
して、このような不良現象を解消する方法として、金型
のゲート部やキャビティ部に超音波振動を付与して成形
材料の流動性を向上させる方法（特公昭５７−２０８８
号公報、特開昭５８−１３４７２２号公報、特開昭６２
−１３５３３３号公報、特開昭６２−１３５３３４号公
報および、特開昭６２−２４９７１７号公報）が開示さ
れている。2. Description of the Related Art When performing injection molding of a molding material, various defective phenomena occur when the thickness of the molded product is 1.2 to 1.3 [mm] or less. Molding was difficult. Examples of such defective phenomena are warpage and deformation due to residual stress, optical distortion, sink marks, weld lines, burrs, flow marks, transfer unevenness,
Poor gloss due to uneven thickness. As a method of improving the fluidity of the molding material and eliminating such a defective phenomenon, a method of applying ultrasonic vibration to the gate portion and the cavity portion of the mold to improve the fluidity of the molding material (Japanese Patent Publication No. S57-57). -2088
JP-A-58-134722, JP-A-62-62
-135333, JP-A-62-135334 and JP-A-62-249717) are disclosed.
【０００３】[0003]
【発明が解決しようとする課題】しかし、これらの方法
は、超音波振動が金型のキャビティ以外の部分にも吸収
されるためにエネルギー損失が大きく、成形材料に超音
波振動を十分に付与できないという問題があった。However, these methods have a large energy loss because the ultrasonic vibrations are absorbed by parts other than the cavity of the mold, and the ultrasonic vibrations cannot be sufficiently applied to the molding material. There was a problem.
【０００４】本発明は、上述の問題に鑑みなされたもの
であり、成形材料の流動性を飛躍的に向上させ、薄肉成
形品を形成する際に発生する不良現象を防止することが
できる射出成形装置およびそれを用いた射出成形方法を
提供することを目的とする。The present invention has been made in view of the above-mentioned problems, and injection molding capable of dramatically improving the fluidity of a molding material and preventing a defective phenomenon occurring when a thin-walled molded product is formed. An object is to provide an apparatus and an injection molding method using the apparatus.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するた
め、本発明によれば、成形機からの成形材料を金型のス
プルーを介して金型のキャビティに供給し、射出成形を
行う射出成形装置において、中心軸部分にスプルーを有
する固定金型と、この固定金型とほぼ同心に当接して配
設された可動金型と、この可動金型の内部に配設され、
固定金型のスプルー出口側の端面とともにキャビティを
形成する端面を有するｎ波長共振体と、このｎ波長共振
体に接合して配設された超音波振動子とを備え、前記可
動金型を軸方向に二分割して形成するとともに、分割部
分の分割部内周部分に凹部を設け、かつ前記ｎ波長共振
体の外周部に凸部を設け、前記ｎ波長共振体の凸部を前
記可動金型の分割部の凹部に嵌合して固定したことを特
徴とする射出成形装置が提供される。In order to achieve the above object, according to the present invention, an injection molding is performed in which a molding material from a molding machine is supplied to a cavity of a mold through a sprue of the mold to perform injection molding. In the apparatus, a fixed mold having a sprue in the central axis portion, a movable mold arranged in contact with the fixed mold substantially concentrically, and arranged inside the movable mold,
Includes an n-wavelength resonator together with the end face of the stationary mold sprue outlet side having an end surface forming a cavity, and an ultrasonic vibrator disposed bonded to the n wavelength resonator, the friendly
The Dokin type with formed bisected in the axial direction, a recess to divide the inner peripheral portion of the divided portion, and a convex portion provided on an outer circumferential portion of the n wavelength resonator, the convex portion of the n wavelength resonator There is provided an injection molding device, characterized in that it is fitted and fixed in a concave portion of the split portion of the movable mold.
【０００６】[0006]
また、その好ましい態様として、前記ｎ波In addition, as a preferable aspect thereof, the n-wave
長共振体における前記凸部より前記超音波振動子側の外Outside the convex portion of the long resonator on the ultrasonic transducer side
径を、前記凸部よりキャビティ側の外径よりも小さくしMake the diameter smaller than the outer diameter on the cavity side of the protrusion.
た射出成形装置が提供される。An injection molding device is provided.
【０００７】
また、その好ましい態様として、前記キャ
ビティ内の成形品を突き出すための突き出しピンを、前
記ｎ波長共振体を貫通して設けたことを特徴とする射出
成形装置が提供される。 Further, as a preferable embodiment, the ejector pins to eject the molded product in the cavity, the injection molding apparatus provided in front <br/> Symbol n wavelength resonator, characterized in that provided through To be done.
【０００８】
また、その好ましい態様として、前記キャ
ビティの形成位置が、前記ｎ波長共振体から発せられる
共振の腹部に対応してなることを特徴とする射出成形装
置が提供される。 Further, as a preferred embodiment, the formation position of the cavity, the injection molding apparatus is provided which is characterized by comprising in correspondence with the abdomen of the resonance emanating from the n wavelength resonator.
【０００９】
また、その好ましい態様として、前記可動
金型の凹部または凸部とｎ波長共振体の凸部または凹部
との嵌合、固定部分が、前記ｎ波長共振体から発せられ
る共振の節部に対応してなることを特徴とする射出成形
装置が提供される。 Further, as a preferred embodiment, the fitting of the projections or recesses of the concave or convex portion and the n-wavelength resonance of the movable mold, the fixed portion, knuckles of the resonance emanating from the n wavelength resonator There is provided an injection molding device characterized by being adapted to.
【００１０】また、前記射出成形装置を用いて、前記ｎ
波長共振体によって共振を発生させて射出成形をするこ
とを特徴とする射出成形方法が提供される。Further, by using the injection molding apparatus, the n
There is provided an injection molding method characterized in that resonance is generated by a wavelength resonator to perform injection molding.
【００１１】また、その好ましい態様として、前記ｎ波
長共振体から発生する共振の腹部をキャビティの位置に
一致させるようにして射出成形することを特徴とする射
出成形方法が提供される。In a preferred embodiment, the n-wave
There is provided an injection molding method characterized by performing injection molding so that an antinode of resonance generated from a long resonator matches a position of a cavity.
【００１２】さらに、その好ましい態様として、前記ｎ
波長共振体から発生する共振の節部を前記可動金型の凹
部と、ｎ波長共振体の凸部との嵌合、固定部分の位置に
一致させて射出成形をすることを特徴とする射出成形方
法が提供される。Further, as a preferred embodiment thereof, the n
The injection molding is characterized in that the node of resonance generated from the wavelength resonator is fitted to the concave portion of the movable mold and the convex portion of the n-wave resonator, and injection molding is performed by matching the position of the fixed portion. A method is provided.
【００１３】以下、本発明の射出成形装置およびそれを
用いた射出成形方法を具体的に説明する。
１．射出成形装置
（１）射出成形
射出成形の範囲
本発明における射出成形は、多色成形方法、射出圧縮成
形方法等を含み、さらに、成形機からの流動状態または
ゴム様状態の成形材料を金型内に圧入し、所定の形状に
賦形した後、成形品を取り出す方法を採用する全ての成
形方法を含むものである。The injection molding apparatus of the present invention and the injection molding method using the same will be specifically described below. 1. Injection Molding Apparatus (1) Injection Molding Range of Injection Molding Injection molding in the present invention includes a multicolor molding method, an injection compression molding method, and the like, and further molds a molding material in a fluid state or a rubber-like state from a molding machine. It includes all molding methods in which a molded product is taken out after being press-fitted into it and shaped into a predetermined shape.
【００１４】成形材料
本発明に用いられる成形材料としては、プラスチック等
の有機材料、無機高分子，セラミックス，金属，ガラス
等の無機材料、その他食料品およびそれらの混合材料等
の、成形時に若干の流動性を有する材料を挙げることが
できる。ここで、プラスチックとしては、たとえば、α
−オレフィン系樹脂（ポリエチレン，ポリプロピレン，
ポリスチレン，シンジオタクティクポリスチレン，塩化
ビニル樹脂，ポリブテン，超高分子量ポリチレン，ポリ
メチルペンテン，アイオノマー，ポリブチレン等）、ポ
リエステル系樹脂、ポリエーテル系樹脂、ポリカーボネ
ート系樹脂、ポリアミド系樹脂、メタクリル系樹脂、フ
ッソ系樹脂、メタクリレート−ブタジエン−スチレン系
樹脂、アクリレート−アクリロニトリル−スチレン系樹
脂、アクリロニトリル−スチレン系樹脂、アクリロニト
リル−ブタジエン−スチレン系樹脂、ポリアセタール系
樹脂、セルロース系樹脂、ポリ塩化ビニリデン、塩素化
ポリエチレン、エチレン−ビニルアセテート系樹脂、ポ
リウレタン樹脂、シリコーン樹脂、アリル樹脂、フラン
樹脂、液晶性ポリマー、エポキシ樹脂、ポリブタジエン
樹脂、シリコーン樹脂、不飽和ポリエステル樹脂、アミ
ノ樹脂、スチレン−ブタジエン系エラストマー、ポリエ
ステル系エラストマー、ポリエチレン系エラストマー、
ウレタン系エラストマー、塩化ビニル系エラストマー等
を挙げることができる。Molding Material As the molding material used in the present invention, organic materials such as plastics, inorganic polymers such as inorganic polymers, ceramics, metals and glasses, and other foods and their mixed materials may be used in a small amount at the time of molding. Materials having fluidity can be mentioned. Here, as the plastic, for example, α
-Olefin resin (polyethylene, polypropylene,
Polystyrene, syndiotactic polystyrene, vinyl chloride resin, polybutene, ultra high molecular weight polyethylene, polymethylpentene, ionomer, polybutylene, etc.), polyester resin, polyether resin, polycarbonate resin, polyamide resin, methacrylic resin, fluorine resin Resin, methacrylate-butadiene-styrene resin, acrylate-acrylonitrile-styrene resin, acrylonitrile-styrene resin, acrylonitrile-butadiene-styrene resin, polyacetal resin, cellulose resin, polyvinylidene chloride, chlorinated polyethylene, ethylene -Vinyl acetate resin, polyurethane resin, silicone resin, allyl resin, furan resin, liquid crystalline polymer, epoxy resin, polybutadiene resin, silicone Fat, unsaturated polyester resins, amino resins, styrene - butadiene elastomer, polyester elastomer, polyethylene-based elastomer,
Examples thereof include urethane-based elastomers and vinyl chloride-based elastomers.
【００１５】（２）金型
本発明に用いられる金型は、固定金型と可動金型とから
なる。本発明に用いられる金型の材質としては、金属、
セラミックス、グラファイト等を挙げることができる
が、超音波による共振部、すなわち、ｎ波長共振体及び
Ｌ−Ｌ変換体の部分は超音波の伝達損失が少ない材質、
例えばチタン合金、ジュラルミン等を用いることが好ま
しい。(2) Mold The mold used in the present invention comprises a fixed mold and a movable mold. The material of the mold used in the present invention is a metal,
Ceramics, graphite, etc. can be mentioned, but the ultrasonic resonance part, that is, the n-wavelength resonator and the L-L converter, is made of a material with a small ultrasonic transmission loss,
For example, it is preferable to use titanium alloy, duralumin, or the like.
【００１６】固定金型
本発明に用いられる固定金型としては、特に制限はな
く、たとえばその形態として、中心軸にスプルーを有す
る汎用のものを挙げることができる。Fixed Mold The fixed mold used in the present invention is not particularly limited, and examples thereof include general-purpose ones having a sprue on the central axis.
【００１７】可動金型
本発明に用いられる可動金型としても、特に制限はな
く、たとえば、その形態として、前記固定金型とほぼ同
心に当接して配設される汎用のものを挙げることができ
る。なお、可動金型は、図１に示すように、軸方向に二
分割してある。可動金型は、二つに分割したものが金型
の温調及び共振体を金型に組み込む都合上好ましく、後
述する共振体の凸部または凹部と嵌合、固定するため、
その分割部の内周部分に凹部または凸部を設けることが
さらに好ましい。この凹部または凸部は、共振体の凸部
または凹部と適切に嵌合しうるものであれば特に制限は
ない。Movable Mold The movable mold used in the present invention is also not particularly limited, and examples thereof include a general-purpose mold which is disposed so as to come into contact with the fixed mold substantially concentrically. it can. In addition, the movable mold has two axial dies, as shown in FIG.
It is divided. The movable mold is preferably divided into two in order to control the temperature of the mold and to incorporate the resonator into the mold, and to fit and fix the convex portion or the concave portion of the resonator described later,
It is more preferable to provide a concave portion or a convex portion on the inner peripheral portion of the divided portion. The concave portion or the convex portion is not particularly limited as long as it can be appropriately fitted with the convex portion or the concave portion of the resonator.
【００１８】なお、この嵌合、固定部分は、共振体、た
とえばｎ波長共振体とＬ−Ｌ変換体とからなるものを用
いる場合、そこから発生するｎ波長共振（ｎ＝１／２
ｍ，ｍは正の整数）の節部と一致するように配設するこ
とが好ましい。When using a resonator, for example, an n-wavelength resonator and an L-L converter, as the fitting and fixing portion, the n-wavelength resonance (n = 1/2) generated from the resonator is used.
It is preferable that m and m are arranged so as to coincide with a node portion of (a positive integer).
【００１９】（３）共振体
本発明に用いられる共振体は、前記可動金型の内部に配
設され、その一端部は、固定金型のスプルー出口側の端
部とキャビティを形成する。(3) Resonator The resonator used in the present invention is disposed inside the movable mold, and one end thereof forms a cavity with the end of the fixed mold on the sprue outlet side.
【００２０】また、共振体には、前述にように、前記可
動金型に設けた凹部または凸部に対応させて、その外周
部に凸部または凹部を設け互いを嵌合固定することが好
ましい。また、本発明においては、共振体から発生する
共振の腹部をキャビティの形成位置と一致させ、かつ、
共振の節部を前記共振体の凸部または凹部（嵌合、固定
部分）と一致させるように振動を与えることが好まし
い。これにより、キャビティ部の振動は大きく、嵌合、
固定部分では振動が小さくて可動金型への振動伝播によ
るエネルギー損失を最小限に止めることができる。Further, as described above, it is preferable that the resonator is provided with a convex portion or a concave portion on the outer peripheral portion thereof so as to correspond to the concave portion or the convex portion provided on the movable mold, and are fitted and fixed to each other. . Further, in the present invention, the resonance abdomen generated from the resonator is aligned with the formation position of the cavity, and
It is preferable to apply vibration so that the node of resonance matches the convex portion or concave portion (fitting or fixing portion) of the resonator. As a result, the vibration of the cavity is large,
Vibration is small at the fixed part, and energy loss due to vibration propagation to the movable mold can be minimized.
【００２１】ｎ波長共振体
本発明において、用いられるｎ波長共振体は、後述する
超音波振動子から発生した振動によってｎ波長（ｎ＝１
／２ｍ，ｍは正の整数、可動金型との嵌合、固定部を共
振の節部と一致させるためには、なるべく節数の少ない
ｎ＜３とすることが好ましい。）で共振する。また、ｎ
波長共振体は、図１に示すように、凸部より超音波振動
子側の外径を、凸部よりキャビティ側の外径よりも小さ
く形成してある。 N-Wavelength Resonator The n-wavelength resonator used in the present invention has an n-wavelength (n = 1) due to vibration generated from an ultrasonic transducer described later.
/ 2m, m is a positive integer, and in order to match the fixed part with the fitting with the movable mold and the resonance node, it is preferable that n <3, which has as few nodes as possible. ) Resonates with. Also, n
As shown in Fig. 1, the wavelength resonator has ultrasonic vibrations from the convex portion.
The outer diameter on the child side is smaller than the outer diameter on the cavity side of the protrusion.
Well formed.
【００２２】Ｌ−Ｌ変換体
本発明において用いられるＬ−Ｌ変換体は、超音波振動
子からの振動の伝播方向を９０度変換するものである。
これにより、振動子を上下方向又は後方に取付けること
が可能となる。L-L Converter The L-L converter used in the present invention converts the propagation direction of the vibration from the ultrasonic transducer by 90 degrees.
This allows the vibrator to be mounted in the vertical direction or in the rear.
【００２３】（４）超音波装置
超音波発振器は、共振体の共振周波数をあらかじめ超音
波振動子の追尾可能な周波数となるように設計、製作し
ているので、成形機のノズルをスプルーに圧接させ、成
形材料をスプルーを介してキャビティに供給する場合の
刻々の負荷変動に対する共振周波数の変化に対し常に追
尾を行ない、また必要電力の供給も刻々の変化に応じて
必要量（最大出力以下）を供給するように設定すること
ができる。(4) Ultrasonic device Since the ultrasonic oscillator is designed and manufactured in advance so that the resonance frequency of the resonator is a frequency that can be tracked by the ultrasonic vibrator, the nozzle of the molding machine is pressed onto the sprue. In this way, when the molding material is supplied to the cavity through the sprue, it constantly tracks changes in the resonance frequency with respect to momentary load fluctuations, and the required power is also supplied in the required amount (maximum output or less) according to the momentary changes. Can be set to supply.
【００２４】振動周波数
本発明の超音波振動子において用いられる振動周波数
は、１［ＫＨｚ］〜１０［ＭＨｚ］が好ましく、成形時
の材料に超音波をきわめて有効に作用させるためには１
０［ＫＨｚ］〜１００［ＫＨｚ］がさらに好ましい。Vibration Frequency The vibration frequency used in the ultrasonic vibrator of the present invention is preferably 1 [KHz] to 10 [MHz], and is 1 in order to allow the ultrasonic waves to act extremely effectively on the material during molding.
0 [KHz] to 100 [KHz] is more preferable.
【００２５】振幅
本発明の超音波振動子において用いられる振幅は、大き
い方がその効果を十分発揮できるため、金型の材質の疲
労度に合わせて設定するのが望ましい。Amplitude The larger the amplitude used in the ultrasonic transducer of the present invention, the more the effect can be sufficiently exhibited, so it is desirable to set it in accordance with the degree of fatigue of the material of the mold.
【００２６】超音波印加時間
本発明の超音波振動子において超音波振動を発生させる
時期は、目的とする効果に応じて、射出時のみ、保圧時
のみ、または射出・保圧時の両方の時期を選ぶことがで
きる。Ultrasonic Wave Application Time The ultrasonic oscillator of the present invention generates ultrasonic vibration depending on the intended effect, either during injection only, during pressure holding only, or both injection and pressure holding. You can choose the time.
【００２７】[0027]
【実施例】以下、本発明を実施例によってさらに具体的
に説明する。
［実施例１］図１に示すように、本実施例においては、
その中心軸部分にスプルー４を有する、ジュラルミン２
０２４からなる固定金型１に、二つに分割したジュラル
ミン２０２４からなる可動金型２（２ａ，２ｂ）をほぼ
同心に当接して配設した。この場合、固定金型１は、固
定金型固定板５によって、また、可動金型２は固定金型
固定板６によってそれぞれ固定されている。その固定金
型２の内部に共振体１１として、ｎ波長共振体１１ａお
よびＬ−Ｌ変換体１１ｂを配設した。また、固定金型１
の一端部とｎ波長共振体１１ａの一端部とによって、図
３（Ａ）に示すように、その形状が円形で、外径が１０
０ｍｍ、厚さが０．５ｍｍのキャビティ３を形成してい
る。また、可動金型２の分割部２ｃの内周部に凹部２ｄ
を形成し、この凹部２ｄとｎ波長共振体１１ａの外周部
に形成した凸部１１ｃとを嵌合、固定した。またＬ−Ｌ
変換体１１ｂには超音波振動子１２（精電舎電子工業社
製 ＳＯＮＯＰＥＴ１２００Ｂ；基本周波数１９．１５
ＫＨｚ）を接合した。また、可動金型固定板６に固定し
た突出しピン１４は、キャビティ３内で成形された成形
品を突き出して取り出すため、油圧シリンダー１５によ
って可動に配設されている。また、成形機（図示せず）
のノズル１３が、固定金型１のスプルー４の入口に当接
して配設されている。このような、射出成形装置２０
に、成形材料としてポリカーボネート（三菱エンジニア
リングプラスチック社製 ユーピロンＨ−４００）を用
いて、以下の条件で射出成形を行った。
型締力 ２５［ｔｏｎ］
射出圧力 ６００［Ｋｇｆ／ｃｍ2 ］
樹脂温度 ３２０［℃］
金型温度 １２０［℃］
振幅 １０［μｍ］
共振 図２に示す１波長共振
キャビティ部 硬質クロムメッキ
得られた成形品は、外観上不良現象を認めなかった。ま
た、成形品の中心からの距離における複屈折を測定し、
その結果を図３に示すが、どの距離においても複屈折は
非常に低かった。EXAMPLES The present invention will be described in more detail below with reference to examples. [Embodiment 1] As shown in FIG. 1, in this embodiment,
Duralumin 2 with sprue 4 in its central axis
A movable mold 2 (2a, 2b) made of duralumin 2024, which was divided into two parts, was disposed on a fixed mold 1 made of 024 so as to be substantially concentric with each other. In this case, the fixed mold 1 is fixed by the fixed mold fixing plate 5, and the movable mold 2 is fixed by the fixed mold fixing plate 6. Inside the fixed mold 2, an n-wavelength resonator 11a and an L-L converter 11b were arranged as a resonator 11. Fixed mold 1
3A and one end of the n-wavelength resonator 11a, the shape is circular and the outer diameter is 10 as shown in FIG.
A cavity 3 having a thickness of 0 mm and a thickness of 0.5 mm is formed. In addition, the concave portion 2d is formed in the inner peripheral portion of the divided portion 2c of the movable mold 2.
Then, the concave portion 2d and the convex portion 11c formed on the outer peripheral portion of the n-wavelength resonator 11a were fitted and fixed. Also L-L
The transducer 11b includes an ultrasonic vibrator 12 (SONOPET 1200B manufactured by Seidensha Denshi Kogyo KK; fundamental frequency 19.15).
KHz) was joined. Further, the protruding pin 14 fixed to the movable mold fixing plate 6 is movably arranged by a hydraulic cylinder 15 in order to protrude and take out the molded product molded in the cavity 3. Also, a molding machine (not shown)
Nozzle 13 is provided in contact with the inlet of the sprue 4 of the fixed mold 1. Such an injection molding apparatus 20
Polycarbonate (Iupilon H-400 manufactured by Mitsubishi Engineering Plastics Co., Ltd.) was used as a molding material, and injection molding was performed under the following conditions. Mold clamping force 25 [ton] Injection pressure 600 [Kgf / cm 2 ] Resin temperature 320 [° C] Mold temperature 120 [° C] Amplitude 10 [μm] Resonance One-wavelength resonant cavity shown in FIG. 2 Hard chrome plating was obtained The molded product did not show any defective appearance. Also, measure the birefringence at a distance from the center of the molded product,
The results are shown in FIG. 3, and the birefringence was extremely low at any distance.
【００２８】［比較例１］実施例１において、超音波を
印加しなかったこと以外は実施例１と同様にした。その
結果、ショートショットとなり所望の成形品を得ること
はできなかった。[Comparative Example 1] The same procedure as in Example 1 was carried out except that ultrasonic waves were not applied. As a result, a short shot was obtained and a desired molded product could not be obtained.
【００２９】［比較例２］実施例１において、射出圧力
を６００［Ｋｇｆ／ｃｍ2 ］から１５００［Ｋｇｆ／ｃ
ｍ2 ］に変えたこと、および超音波を印加しなかったこ
と以外は実施例１と同様にした。その結果、成形品には
ソリが生じ、図３に示すように複屈折は非常に高かっ
た。[Comparative Example 2] In Example 1, the injection pressure was changed from 600 [Kgf / cm 2 ] to 1500 [Kgf / c.
m 2 ] and that no ultrasonic wave was applied. As a result, the molded product was warped, and the birefringence was extremely high as shown in FIG.
【００３０】［実施例２］実施例１において、射出圧力
を６００［Ｋｇｆ／ｃｍ2 ］から４００［Ｋｇｆ／ｃｍ
2 ］に変えたこと、およびキャビティ部を硬質クロムメ
ッキからカニフロンメッキ（Ｎｉ，Ｐ，フッ素系樹脂：
日本カニゼン社製）に変えたこと以外は、実施例１と同
様にした。その結果、実施例１とほぼ同様の結果が得ら
れた。[Embodiment 2] In Embodiment 1, the injection pressure is changed from 600 [Kgf / cm 2 ] to 400 [Kgf / cm 2.
2 ], and the cavity is changed from hard chrome plating to Kaniflon plating (Ni, P, fluorine resin:
The same procedure as in Example 1 was performed except that the product was changed to Kanigen Japan Co., Ltd.). As a result, almost the same results as in Example 1 were obtained.
【００３１】［実施例３］実施例１において、成形材料
をポリカーボネートからポリスチレン（出光石油化学社
製 ＨＴ−５５）に変え、また、成形条件のうち、樹脂
温度を３２０℃から２２０℃に、また金型温度を１２０
℃から６０℃および２０℃に変えたこと以外は、実施例
１と同様にした。得られた成形品の表面の光沢を変角光
沢計（入射角４５℃）を用いて測定した。その結果を、
下記［表１］に示す。Example 3 In Example 1, the molding material was changed from polycarbonate to polystyrene (HT-55 manufactured by Idemitsu Petrochemical Co., Ltd.), and the resin temperature was changed from 320 ° C. to 220 ° C. under the molding conditions. Mold temperature 120
Example 1 was repeated except that the temperature was changed from 60 ° C to 60 ° C and 20 ° C. The gloss of the surface of the obtained molded product was measured using a gonio gloss meter (incident angle: 45 ° C.). The result is
It is shown in the following [Table 1].
【００３２】［表１］ ──────────────────── 金型温度［℃］ 光沢（グロス［％］） ──────────────────── ６０ ８９ ２０ ８８ ────────────────────[Table 1] ──────────────────── Mold temperature [℃] Gloss (Gloss [%]) ──────────────────── 60 89 20 88 ────────────────────
【００３３】上記表１から超音波を印加することによっ
て、金型温度に関係なく、表面光沢の高い成形品を得る
ことができることがわかった。また、金型温度を低くす
ることができるためハイサイクル成形が可能であること
がわかった。From Table 1 above, it was found that by applying ultrasonic waves, a molded article having high surface gloss can be obtained regardless of the mold temperature. It was also found that high cycle molding is possible because the mold temperature can be lowered.
【００３４】［実施例４］実施例３において、キャビテ
ィ形状を図３（Ａ）に示すものから図３（Ｂ）に示すも
のに変え、また成形条件のうち、射出圧力を６００［Ｋ
ｇｆ／ｃｍ2 ］から１０００［Ｋｇｆ／ｃｍ2 ］に変え
るとともに、金型温度を６０℃に限ったこと以外は実施
例３と同様にした。得られた成形品は、０．２ｍｍの薄
肉部まで樹脂が流れ、所望のものを得ることができた。[Embodiment 4] In Embodiment 3, the cavity shape is changed from that shown in FIG. 3 (A) to that shown in FIG. 3 (B), and the injection pressure is 600 [K] among the molding conditions.
Example 3 was performed in the same manner as in Example 3 except that gf / cm 2 ] was changed to 1000 [Kgf / cm 2 ] and the mold temperature was limited to 60 ° C. In the obtained molded product, the resin flowed to a thin portion of 0.2 mm, and a desired product could be obtained.
【００３５】［比較例３］実施例４において、超音波を
印加しなかったこと以外は実施例４と同様にした。得ら
れた成形品は０．２ｍｍの薄肉部まで樹脂が流れず、所
望のものを得ることはできなかった。[Comparative Example 3] The same procedure as in Example 4 was carried out except that ultrasonic waves were not applied. In the obtained molded product, the resin did not flow to the thin portion of 0.2 mm, and the desired product could not be obtained.
【００３６】[0036]
【発明の効果】以上、説明したように、本発明によっ
て、成形材料の流動性を飛躍的に向上させ、薄肉成形品
を成形する際に発生する不良現象（たとえば、光学歪
み，ソリ，光沢不良等）を防止することができる射出成
形装置およびそれを用いた射出成形方法が提供される。
特に、肉厚が１．３ｍｍ以下の部分を持つ成形品の形成
に有用である。また、成形材料の流動性の向上によって
金型温度を通常より低めに設定することができるため、
ハイサイクル成形が可能となった。As described above, according to the present invention, the fluidity of the molding material is remarkably improved, and defective phenomena (for example, optical distortion, warpage, and gloss defect) that occur when molding a thin-walled molded product are obtained. An injection molding apparatus and an injection molding method using the same are provided.
Particularly, it is useful for forming a molded product having a portion having a wall thickness of 1.3 mm or less. In addition, since the mold temperature can be set lower than usual by improving the fluidity of the molding material,
High cycle molding has become possible.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の射出成形装置の実施例を模式的に示す
概略断面図である。FIG. 1 is a schematic sectional view schematically showing an embodiment of an injection molding device of the present invention.
【図２】本発明の射出成形装置の実施例におけるｎ波長
共振体及びＬ−Ｌ変換体の共振（１波長共振）の状態を
模式的に示す説明図である。FIG. 2 is an explanatory view schematically showing a state of resonance (single wavelength resonance) of an n-wavelength resonator and an L-L converter in an embodiment of the injection molding apparatus of the present invention.
【図３】本発明の射出成形装置の実施例または比較例に
おけるキャビティの形状を模式的に示す正面図である。FIG. 3 is a front view schematically showing the shape of a cavity in an example or a comparative example of the injection molding apparatus of the present invention.
【図４】本発明の射出成形装置およびそれを用いた射出
成形方法の実施例および比較例によって得られた成形品
の中心からの距離と複屈折との関係を示す説明図であ
る。FIG. 4 is an explanatory diagram showing the relationship between the distance from the center of a molded article and birefringence obtained by Examples and Comparative Examples of the injection molding apparatus and the injection molding method using the same according to the present invention.
１ 固定金型 ２ 可動金型 ２ａ 可動金型の一の分割部分 ２ｂ 可動金型の他の分割部分 ２ｃ 分割部 ２ｄ 凹部 ３ キャビティ ４ スプルー ５ 固定金型固定板 ６ 可動金型固定板 １０ 金型 １１ 共振体 １１ａ ｎ波長共振体 １１ｃ 凸部 １２ 超音波振動子 １３ ノズル １４ 突出ピン １５ 油圧シリンダー ２０ 射出成形装置 1 Fixed mold 2 movable mold 2a One divided part of movable mold 2b Other parts of movable mold 2c Division 2d recess 3 cavities 4 sprue 5 Fixed mold fixing plate 6 Movable mold fixing plate 10 mold 11 Resonator 11a n wavelength resonator 11c convex part 12 Ultrasonic transducer 13 nozzles 14 protruding pin 15 hydraulic cylinder 20 Injection molding equipment
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−213311（ＪＰ，Ａ) 特開 平２−245276（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 45/26 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-3-213311 (JP, A) JP-A-2-245276 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) B29C 45/26
Claims (8)
を介して金型のキャビティに供給し、射出成形を行う射
出成形装置において、 中心軸部分にスプルーを有する固定金型と、この固定金
型とほぼ同心に当接して配設された可動金型と、この可
動金型の内部に配設され、固定金型のスプルー出口側の
端面とともにキャビティを形成する端面を有するｎ波長
共振体と、このｎ波長共振体に接合して配設された超音
波振動子とを備え、前記可動金型を軸方向に二分割して形成するとともに、
分割部分の 分割部内周部分に凹部を設け、かつ前記ｎ波
長共振体の外周部に凸部を設け、前記ｎ波長共振体の凸
部を前記可動金型の分割部の凹部に嵌合して固定したこ
とを特徴とする射出成形装置。1. A fixed mold having a sprue in a central axis portion and a fixed mold in an injection molding apparatus for supplying a molding material from a molding machine to a cavity of the mold through a sprue of the mold to perform injection molding. An n-wavelength resonator having a movable mold disposed substantially in concentric contact with the mold and an end face that forms a cavity with the end face of the fixed mold on the sprue outlet side, which is disposed inside the movable mold. And an ultrasonic transducer disposed so as to be bonded to the n-wavelength resonator, and the movable mold is formed by dividing the movable mold into two in the axial direction.
A concave portion is provided on the inner peripheral portion of the divided portion of the divided portion, and a convex portion is provided on the outer peripheral portion of the n-wavelength resonator, and the convex portion of the n-wavelength resonator is fitted into the concave portion of the divided portion of the movable mold. An injection molding device characterized by being fixed.
前記超音波振動子側の外径を、前記凸部よりキャビティ
側の外径よりも小さくした請求項１記載の射出成形装
置。 2. From the convex portion of the n-wavelength resonator
The outer diameter of the ultrasonic transducer side should be
The injection molding apparatus according to claim 1, wherein the outer diameter is smaller than the outer diameter on the side.
Place
めの突き出しピンを、前記ｎ波長共振体を貫通して設け
たことを特徴とする請求項１又は２記載の射出成形装
置。 Wherein the ejector pins to eject the molded product in the cavity, the injection molding apparatus according to claim 1 or 2, wherein the provided through said n wavelength resonator.
長共振体から発せられる共振の腹部に対応してなること
を特徴とする請求項１〜３のいずれかに記載の射出成形
装置。 4. A forming position of the cavity, the injection molding apparatus according to any one of claims 1 to 3, characterized in that in response to the abdomen of the resonance emanating from the n wavelength resonator.
部との固定部分が、前記ｎ波長共振体から発せられる共
振の節部に対応してなることを特徴とする請求項１〜４
のいずれかに記載の射出成形装置。 5. A method according to claim 1, the fixed part of the convex portion of the concave portion and the n-wavelength resonance of the movable mold, characterized by comprising in correspondence with the knuckles of the resonance emanating from the n wavelength resonator ~ 4
The injection molding apparatus according to any one of 1.
形装置を用いて、前記ｎ波長共振体によって共振を発生
させて射出成形をすることを特徴とする射出成形方法。6. An injection molding method using the injection molding apparatus according to claim 1, wherein resonance is generated by the n-wavelength resonator to perform injection molding.
部をキャビティの位置に一致させるようにして射出成形
することを特徴とする請求項６記載の射出成形方法。7. The injection molding method according to claim 6, wherein injection molding is performed so that an antinode of resonance generated from the n-wavelength resonator is aligned with the position of the cavity.
部を、前記可動金型の凹部と前記ｎ波長共振体の凸部と
の固定位置に一致させて射出成形をすることを特徴とす
る請求項６又は７記載の射出成形方法。8. The injection molding is performed by aligning a node portion of resonance generated from the n-wavelength resonator with a fixed position of a concave portion of the movable mold and a convex portion of the n-wavelength resonator. The injection molding method according to claim 6 or 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09618195A JP3480115B2 (en) | 1995-03-29 | 1995-03-29 | Injection molding apparatus and injection molding method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09618195A JP3480115B2 (en) | 1995-03-29 | 1995-03-29 | Injection molding apparatus and injection molding method using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08267508A JPH08267508A (en) | 1996-10-15 |
| JP3480115B2 true JP3480115B2 (en) | 2003-12-15 |
Family
ID=14158154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09618195A Expired - Fee Related JP3480115B2 (en) | 1995-03-29 | 1995-03-29 | Injection molding apparatus and injection molding method using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3480115B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6464485B1 (en) * | 1999-06-24 | 2002-10-15 | Pioneer Corporation | Ultrasonic injection mold for an optical disk |
| WO2020020830A1 (en) * | 2018-07-24 | 2020-01-30 | Straumann Holding Ag | Process for the preparation of an article by powder injection molding |
-
1995
- 1995-03-29 JP JP09618195A patent/JP3480115B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08267508A (en) | 1996-10-15 |
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