JP3328859B2 - Injection molding simultaneous painting method and apparatus - Google Patents
Injection molding simultaneous painting method and apparatusInfo
- Publication number
- JP3328859B2 JP3328859B2 JP32957393A JP32957393A JP3328859B2 JP 3328859 B2 JP3328859 B2 JP 3328859B2 JP 32957393 A JP32957393 A JP 32957393A JP 32957393 A JP32957393 A JP 32957393A JP 3328859 B2 JP3328859 B2 JP 3328859B2
- Authority
- JP
- Japan
- Prior art keywords
- injection molding
- mold
- sheet
- painting
- vibration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
-
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
- B29C2045/14188—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure trimming the article in the mould
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、射出成形品に成形と同
時に絵付けを行う際の製造方法及び装置の改良に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a manufacturing method and an apparatus for performing painting simultaneously with molding of an injection molded article.
【０００２】[0002]
【従来の技術】従来、絵付け成形品を製造する技術とし
て、成形性良好な基材フイルムの上に印刷層を設けた化
粧シートを射出成形金型内に配置して、合成樹脂の射出
成形を行うことにより絵柄を合体した成形品を得る方法
が広く行われている。化粧シートには、特公昭３３ー３
１８０号公報、特公昭５０ー１９１３２号公報等に開示
されているように、基材フイルムに絵柄印刷を設けて射
出成形と同時に成形品と積層一体化するタイプと、特公
昭５１ー３３４５６号公報、特公平２ー４２０８０号公
報等に記載されているように、基材フイルムに剥離層、
絵柄印刷層及び接着層を積層したフイルムを使用し、成
形後に基材フイルムを剥離するタイプとがある。2. Description of the Related Art Conventionally, as a technique for producing a painted molded product, a decorative sheet having a printed layer provided on a base film having good moldability is arranged in an injection mold and injection molding of synthetic resin is performed. The method of obtaining the molded article which united the picture by performing the process is widely performed. On the decorative sheet, Tokuboku No. 33-3
As disclosed in JP-B-180-180, JP-B-50-19132, etc., a type in which a pattern print is provided on a base film and laminated with a molded product simultaneously with injection molding is disclosed in JP-B-51-33456. As described in JP-B-2-42080, etc., a release layer is formed on a base film,
There is a type in which a film in which a pattern printing layer and an adhesive layer are laminated is used, and the base film is peeled off after molding.
【０００３】成形品の形状が複雑であったり、深絞り形
状の場合は、化粧シートを予備成形しておく必要があ
る。射出成形金型の雌型を真空成形金型として利用して
予備成形した後、雄型と雌型を型締めして合成樹脂を射
出して成形を行う方法が試みられている。この方法によ
れば、真空成形金型が不要であるし、予備成形に続いて
直ちに射出成形を行うことができて能率がよい。[0003] When the shape of a molded product is complicated or deep drawing, it is necessary to preform a decorative sheet. A method has been attempted in which a female mold of an injection mold is preformed using a vacuum mold, and then the male mold and the female mold are clamped to inject a synthetic resin to perform molding. According to this method, a vacuum molding die is unnecessary, and injection molding can be performed immediately after preliminary molding, which is efficient.
【０００４】しかし、いずれの方法の場合も、脱型（型
開き）後絵付けシートを切断して打ち抜く必要があり、
成形時にインラインで、成形品周辺部の余剰の絵付けシ
ートを切断し打ち抜く方法として、特公昭３９ー１９０
４１号公報、特開昭６１ー６３４２５号公報に開示され
ているように、雌型と雄型のキャビティ周縁部を互いに
嵌合しつつ剪断するような刃を設けて、型締めと同時に
絵付けシートを切断、打ち抜きを行った後に溶融樹脂を
型内に射出して成形品を得る方法が行われていた。However, in either case, it is necessary to cut and punch the painting sheet after releasing the mold (opening the mold).
As a method of cutting and punching out an excess paint sheet in the periphery of a molded product in-line during molding, Japanese Patent Publication No. 39-190
No. 41 and Japanese Patent Application Laid-Open No. 61-63425, a blade is provided which fits the peripheral edges of the female and male cavities while shearing each other, and paints simultaneously with clamping. A method of cutting and punching a sheet and then injecting a molten resin into a mold to obtain a molded product has been performed.
【０００５】[0005]
【発明が解決しようとする課題】絵付けシートの打ち抜
きを両金型の嵌合によって剪断する場合は、両金型に設
けた刃の部分の嵌合精度が要求され高い加工精度が必要
となる。加工精度の誤差、又は、刃の経時的磨耗によっ
て、両金型の周縁部の嵌合に隙間が生じると、単に打ち
抜きができなくなるだけでなく、キャビティ内の気密性
が悪くなり、成形品に気泡が生じたり、射出樹脂がキャ
ビティから洩れだすこともあり得る。また、既に打ち抜
かれた１枚の絵付けシートに樹脂を射出するため、絵付
けシートの周縁部から樹脂が裏面（絵付けシートと雌型
の間）に回り込み、絵付け成形品にバラツキが生じて製
品歩留りが悪くなる。さらに、絵付けシートと金型との
位置もズレ易く、成形品と絵柄の位置精度が悪くなり、
成形品に対して絵柄の位置精度が要求される製品には問
題がある。In the case where the punching of the painting sheet is sheared by fitting the two dies, the fitting accuracy of the blade portions provided on both the dies is required, and a high processing accuracy is required. . If there is a gap in the fitting of the peripheral parts of the two dies due to errors in processing accuracy or wear of the blades over time, not only can punching not be possible, but also the airtightness in the cavity deteriorates, resulting in a molded product. Bubbles may occur and the injection resin may leak out of the cavity. In addition, since resin is injected into one already-painted painting sheet, the resin flows from the periphery of the painting sheet to the back surface (between the painting sheet and the female mold), causing variations in the painted molded product. The product yield is worse. Furthermore, the position of the painting sheet and the mold is also easily displaced, and the positional accuracy between the molded product and the pattern deteriorates.
There is a problem with products that require positional accuracy of a pattern with respect to a molded product.
【０００６】[0006]
【課題を解決するための手段】射出成形装置の雌型と雄
型の間に絵付けシートを挿入して、射出成形を行う射出
成形同時絵付け方法において、金型キャビティの周縁部
を囲遶し、且つ絵付けシートを表裏両面から挟むように
設けた一対の振動打ち抜き刃により、射出成形中又は射
出成形後に型開きする迄の間に、刃に機械的に振動を励
起させ、片方の刃を前進させ、もう片方の刃を後退させ
つつ、成形品周辺の余剰シートを局部的に加熱溶断した
後に両金型を型開きして、絵付け射出成形品を取り出す
方法とした。また、金型の雌型と雄型の間に絵付けシー
トを挿入して、射出成形と同時に絵付けを行う射出成形
装置において、金型キャビティの周縁部を囲遶し、且つ
絵付けシートを表裏両面から挟むようにした一対の刃を
両金型に設け、更に、該一対の刃を、振動するための振
動発生装置と、前進、後退させるための駆動装置と、加
熱するための加熱装置を金型内に設けた射出成形同時絵
付け装置とした。In the simultaneous injection molding and painting method of performing injection molding by inserting a painting sheet between a female mold and a male mold of an injection molding apparatus, the peripheral edge of a mold cavity is surrounded by an indentation. By means of a pair of vibrating punching blades provided so as to sandwich the painting sheet from both front and back sides, mechanical vibration is applied to one of the blades during injection molding or before the mold is opened after injection molding. , And while the other blade is retracted, the excess sheet around the molded product is locally heated and melted, and then both molds are opened to remove the painted injection molded product. In addition, in an injection molding apparatus that inserts a painting sheet between a female mold and a male mold of a mold to perform painting simultaneously with injection molding, in an injection molding apparatus, the periphery of the mold cavity is surrounded, and the painting sheet is inserted. A pair of blades sandwiched from both sides are provided on both molds, and further, a vibration generator for vibrating the pair of blades, a driving device for moving forward and backward, and a heating device for heating. Was used as an injection molding simultaneous painting apparatus provided in a mold.
【０００７】[0007]
【作用】本発明によれば、帯状の絵付けシートを金型内
に挿入して射出成形を行い、成形品に絵付けした後に、
刃の剪断応力を用いず局部的な加熱溶融によりインライ
ンで絵付けシートの打ち抜きを行うので、生産性を低下
させることなく、成形品と絵柄を精度よく同調させるこ
とができる。According to the present invention, a belt-shaped painting sheet is inserted into a mold to perform injection molding, and after painting on a molded article,
Since the painting sheet is punched in-line by local heating and melting without using the shear stress of the blade, it is possible to synchronize the molded product and the pattern with high precision without lowering the productivity.
【０００８】[0008]
【実施例】以下、実施例に基づいて、図面を参照にしな
がら本発明を詳細に説明する。図１は本発明の射出成形
同時絵付け装置により絵付け成形品を作る場合の一例を
示す装置の概略説明図である。図２〜図７は本発明の射
出成形同時絵付け方法の手順を示した図である。図８、
図９は絵付けシートを打ち抜くための振動打ち抜き刃の
斜視図、及び断面図である。図１０は振動打ち抜き刃を
両金型に装着した時の説明図である。図１１は振動打ち
抜き刃の振動波形を示す図ある。図１２は振動打ち抜き
刃の振動を循環進行波ににするための振動発生装置の取
り付け方法を示す図であり、図１３はｎ相交流の各相の
電圧波形を示す図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments with reference to the drawings. FIG. 1 is a schematic explanatory view of an apparatus showing an example of a case where a painted molded article is produced by the simultaneous injection molding painting apparatus of the present invention. 2 to 7 are views showing the procedure of the simultaneous injection molding painting method of the present invention. FIG.
FIG. 9 is a perspective view and a sectional view of a vibration punching blade for punching a painting sheet. FIG. 10 is an explanatory view when the vibration punching blade is mounted on both dies. FIG. 11 is a diagram showing a vibration waveform of the vibration punching blade. FIG. 12 is a diagram illustrating a method of attaching a vibration generator for converting the vibration of the vibration punching blade into a circulating traveling wave, and FIG. 13 is a diagram illustrating voltage waveforms of each phase of an n-phase alternating current.
【０００９】以下に、本発明の射出成形同時絵付け方法
及びその装置について手順に従って説明する。図１に示
すように、絵付けシート３は基材に木目等の絵柄を印刷
した巻取より供給され、射出成形装置の雌型金型１と雄
型金型２の間に帯状シートとして、連続的に供給され
る。この際、絵付けシートには見当合わせマーク９（図
７参照）が印刷されており、このマークをセンサーで捉
えて、シート搬送装置により成形品の大きさに相当する
１ピッチ分の絵付けシートが精度よく送られる。シート
が供給される時は、シートを加熱するための加熱盤４は
射出成形装置から離れた位置に退避している。尚、此処
で連続生産性の点から絵付けシートは帯状連続シート
（ウエッブ）として供給することが好ましいが、枚葉シ
ートで供給することも可能である。また、センサーマー
クも成形品形状と絵柄との位置を高精度で同調させる場
合には必須となるが、絵柄位置の同調不要の場合は省く
ことができる。Hereinafter, a method and apparatus for simultaneous painting by injection molding according to the present invention will be described in accordance with procedures. As shown in FIG. 1, the painting sheet 3 is supplied from a winding substrate in which a pattern such as wood grain is printed on a base material, and is a belt-shaped sheet between the female mold 1 and the male mold 2 of the injection molding apparatus. It is supplied continuously. At this time, a registration mark 9 (see FIG. 7) is printed on the painting sheet, and the mark is caught by a sensor, and the sheet conveyance device is used to print a one-pitch painting sheet corresponding to the size of a molded product. Is sent with high accuracy. When the sheet is supplied, the heating platen 4 for heating the sheet is retracted to a position away from the injection molding apparatus. Here, from the viewpoint of continuous productivity, the painting sheet is preferably supplied as a belt-shaped continuous sheet (web), but may be supplied as a single sheet. In addition, the sensor mark is indispensable when the position of the shape of the molded article and the position of the pattern are synchronized with high accuracy, but can be omitted when the position of the pattern is not required to be synchronized.
【００１０】絵付けシートは基材シートに絵柄を印刷し
た転写シート又はラミネートシートいずれも使用でき
る。基材シートには熱可塑性樹脂のポリプロピレン、ポ
リエチレン等のポリオレフィン、ポリエチレンテレフタ
レート、ポリブチレンテレフタレート等の熱可塑性ポリ
エステル、ポリ塩化ビニル、アクリル、ポリスチレン、
ナイロン、ＡＢＳ等が使用できる。厚さは通常２５〜５
００μｍ程度であり、枚葉シート又は帯状連続シートと
して供給される。As the painting sheet, any of a transfer sheet or a laminate sheet having a pattern printed on a base sheet can be used. The base material sheet is a thermoplastic resin such as polypropylene, polyolefin such as polyethylene, polyethylene terephthalate, thermoplastic polyester such as polybutylene terephthalate, polyvinyl chloride, acrylic, polystyrene,
Nylon, ABS and the like can be used. The thickness is usually 25-5
It is about 00 μm, and is supplied as a single sheet or a belt-shaped continuous sheet.
【００１１】上記射出成形同時絵付け装置は雌型金型と
雄型金型を備えており、両金型を型締めした後に金型内
に溶融樹脂をノズル湯口より射出して成形を行うもの
で、基本的には従来の射出成形機と同じ構成をしてい
る。即ち、雌型金型１は移動盤５に固定され、移動盤５
は油圧シリンダー２１とピストン２２により雄型金型２
の方向に移動できるようになっている。雄型金型２は固
定盤６に固定されており、その内部に溶融樹脂の射出ノ
ズル２４が設けられている。The above-described injection molding simultaneous painting apparatus comprises a female mold and a male mold, and performs molding by injecting a molten resin into the mold from a nozzle gate after clamping both molds. Thus, it has basically the same configuration as a conventional injection molding machine. That is, the female mold 1 is fixed to the moving platen 5,
Is a male mold 2 by a hydraulic cylinder 21 and a piston 22.
You can move in the direction of. The male mold 2 is fixed to a fixed platen 6, and an injection nozzle 24 for molten resin is provided therein.
【００１２】本発明の射出成形同時絵付け装置は、絵付
けシートを打ち抜くための一対の振動打ち抜き刃１１ａ
と副振動打ち抜き刃１１ｂが設けられている。この振動
打ち抜き刃１１ａは雄型金型２に取り付けられており、
雄型金型１のコア及び雌型金型のキャビティ周縁部を取
り囲むような形状をしており、その先端は刃先のように
先鋭化されている。一方副振動打ち抜き刃１１ｂは雌型
金型１に、金型のキャビティを取り囲むように取り付け
られており、その形状は振動打ち抜き刃１１ａと同じで
あるが刃の先端は平坦な面となっている。その振動打ち
抜き刃１１ａ及び副振動打ち抜き刃１１ｂは、固定治具
及び支持棒により進退装置１３に接続されていて、水平
方向に前進、後退ができるようになっている。更に、振
動打ち抜き刃１１ａ及び副振動打ち抜き刃１１ｂには絵
付けシートを振動加熱するための振動発生装置１２が取
り付けられていて、振動しながら前進、後退を可能にし
ている。この両金型に取り付けた振動打ち抜き刃１１ａ
と副振動打ち抜き刃１１ｂが相互に前進、後退して絵付
けシートを振動加熱して溶断する。The simultaneous injection molding painting apparatus of the present invention comprises a pair of vibration punching blades 11a for punching a painting sheet.
And a sub-vibration punching blade 11b. This vibration punching blade 11a is attached to the male mold 2,
It is shaped so as to surround the core of the male mold 1 and the peripheral edge of the cavity of the female mold, and its tip is sharpened like a cutting edge. On the other hand, the sub-vibration punching blade 11b is attached to the female mold 1 so as to surround the cavity of the die, and the shape is the same as the vibration punching blade 11a, but the tip of the blade is a flat surface. . The vibration punching blade 11a and the sub-vibration punching blade 11b are connected to an advance / retreat device 13 by a fixing jig and a support rod, so that they can move forward and backward in the horizontal direction. Further, a vibration generator 12 for vibrating and heating the painting sheet is attached to the vibration punching blade 11a and the sub-vibration punching blade 11b, so that the vibrating punching blade 11a and the auxiliary vibration punching blade 11b can move forward and backward while vibrating. Vibration punching blade 11a attached to both dies
And the sub-vibration punching blades 11b advance and retreat each other to vibrate and heat the painting sheet to fuse it.
【００１３】次に、本発明の射出成形同時絵付け方法を
手順に従って説明する。図２に示すように、射出成形装
置の雌型金型１と雄型金型２の間に帯状の絵付けシート
３を配置し、熱盤４を移動してシートに接触させて雌型
金型１のフランジ部（パーティング面）に押しつけると
同時にシートをを加熱する。次に、図３に示すように、
真空ポンプ（図示せず）にて雌型金型１の吸気孔２５か
ら吸引して雌型金型１のキャビティ７内を減圧して、絵
付けシートを予備成形して雌型金型１のキャビティ壁に
密着させる。尚、この予備成形は、金型の凹凸が大きく
絵付けシートの成形に伴う変形量が大きいときは不可欠
であるが、そうでない時はこれを省略することができ
る。Next, the injection molding simultaneous painting method of the present invention will be described according to the procedure. As shown in FIG. 2, a band-shaped painting sheet 3 is arranged between the female mold 1 and the male mold 2 of the injection molding apparatus, and the hot platen 4 is moved to contact the sheet, thereby forming the female mold. The sheet is heated while being pressed against the flange portion (parting surface) of the mold 1. Next, as shown in FIG.
The interior of the cavity 7 of the female mold 1 is depressurized by being sucked through the suction hole 25 of the female mold 1 by a vacuum pump (not shown), and a painting sheet is preformed to form the female mold 1. Adhere to cavity wall. Note that this preforming is indispensable when the irregularities of the mold are large and the amount of deformation accompanying the forming of the painting sheet is large, but when it is not so, it can be omitted.
【００１４】図４に示すように、油圧シリンダー２１を
利用してピストン２２にて雌型金型１の移動盤５を押し
て雌型金型１と雄型金型２の型締めをし、雄型金型２に
設けられている射出ノズル２４よりゲート（湯口）２３
を通して溶融樹脂４２を金型内に射出して射出成形品４
１を作ると同時に絵付けシート３の予備成形物に接着し
て絵付け成形品を得る。As shown in FIG. 4, the movable platen 5 of the female mold 1 is pushed by the piston 22 using the hydraulic cylinder 21 so that the female mold 1 and the male mold 2 are clamped. Gate (gate) 23 from an injection nozzle 24 provided in the mold 2
The molten resin 42 is injected into the mold through the
At the same time as making 1, a painting molded article is obtained by adhering to the preform of the painting sheet 3.
【００１５】樹脂としては、通常射出成形できる熱可塑
性樹脂が使用されるが、反応性硬化型樹脂溶液を用いた
ＲＩＭ成形（反応性射出成形）にも適用可能である。熱
可塑性樹脂としては、ポリスチレン、ポリ塩化ビニル、
ＡＢＳ、ポリプロピレン等が、反応硬化型樹脂として
は、イソシアネートとポリオールからなるポリウレタン
イソシアネート、有機スルホン酸塩、過酸化ベンゾイル
等を硬化剤とする不飽和ポリエステル等がある。尚、こ
こで使用される溶融樹脂は常温で液状のものと常温では
固体のものを加熱により溶融状にしたものと両方を包含
するものとする。As the resin, a thermoplastic resin which can be injection-molded is usually used, but it is also applicable to RIM molding (reactive injection molding) using a reactive curable resin solution. As the thermoplastic resin, polystyrene, polyvinyl chloride,
Examples of the reaction-curable resin such as ABS and polypropylene include polyurethane isocyanate composed of isocyanate and polyol, organic sulfonate, and unsaturated polyester using benzoyl peroxide as a curing agent. It is to be noted that the molten resin used here includes both a liquid resin at normal temperature and a solid resin that is melted by heating at normal temperature.
【００１６】型締め、射出成形を行っている間に、図５
に示すように、雄型金型２と雌型金型１に取り付けた振
動打ち抜き刃１１ａと副振動打ち抜き刃１１ｂを水平方
向に前進、後退させて絵付けシートを打ち抜く。即ち、
振動打ち抜き刃１１ａと副振動打ち抜き刃１１ｂをそれ
ぞれ圧電型の機械的振動発生装置１２により、周波数５
０ヘルツ、片振幅０．２５ｍｍの正弦波で励振させて振
動加熱を行う。上記のように、両方の刃を振動させる
と、絵付けシートは刃の形状に沿うて自己発熱して軟化
し更には流動可能状態となる。While performing mold clamping and injection molding, FIG.
As shown in (1), the vibrating punching blade 11a and the sub-vibrating punching blade 11b attached to the male mold 2 and the female mold 1 are advanced and retracted in the horizontal direction to punch out the painting sheet. That is,
The vibration punching blade 11a and the sub-vibration punching blade 11b are respectively driven by a piezoelectric mechanical vibration generator 12 at a frequency of 5 Hz.
Vibration heating is performed by exciting with a sine wave of 0 Hz and a single amplitude of 0.25 mm. As described above, when both blades are vibrated, the decorating sheet self-heats along the shape of the blade, softens, and becomes a flowable state.
【００１７】振動発生装置１２は振動子１４と電源用コ
ード（以下電線とする）１５からなっている。尚、励振
の振動数は１５Ｈｚ〜１ＭＨｚ程度の可聴周波数から超
音波の領域の周波数の中からシートの材質、厚さ、刃の
形等に応じて最適の値を選べばよく、また、振幅も適宜
調整すればよい。振動発生装置としても圧電型の他、磁
歪型等各種方式のものが使用できる。The vibration generator 12 comprises a vibrator 14 and a power cord (hereinafter referred to as an electric wire) 15. The frequency of the excitation may be selected from the audible frequency of about 15 Hz to about 1 MHz from the frequency in the ultrasonic range according to the material of the sheet, the thickness, the shape of the blade, etc., and the amplitude may be selected. It may be adjusted appropriately. As the vibration generator, various types such as a magnetostrictive type can be used in addition to the piezoelectric type.
【００１８】振動打ち抜き刃１１ａの進退装置１３を作
動させて雌型金型１方向に前進させると共に、副振動打
ち抜き刃１１ｂの進退装置１３を後退させて、溶融状態
の絵付けシートを振動打ち抜き刃形状に打ち抜く。絵付
けシートが完全に打ち抜かれると雄型金型の方の進退装
置１３は後退し、雌型金型の方の進退装置１３は前進し
て元の位置に戻る。The advance / retreat device 13 of the vibration punching blade 11a is operated to advance in the direction of the female mold 1, and the advance / retreat device 13 of the sub-vibration punching blade 11b is retracted so that the painted sheet in the molten state is vibrated. Punch into shape. When the painting sheet is completely punched out, the advance / retreat device 13 of the male mold retreats, and the advance / retreat device 13 of the female mold advances and returns to the original position.
【００１９】次に、図６に示すように型開きをして、絵
付け成形品を取り出す。絵付け成形品４２は図７に示さ
れるように、バリ部４３が付いた状態で取り出され、残
りの絵付けシートは図７に示すようになり、シート搬送
装置（図示せず）により、１ピッチ分づつ送られ、新し
い絵付けシートが金型間に送られて次の射出成形工程に
移る。Next, as shown in FIG. 6, the mold is opened, and the painted molded product is taken out. As shown in FIG. 7, the painted product 42 is taken out with the burr 43 attached, and the remaining painted sheet is as shown in FIG. The sheet is fed at intervals of a pitch, and a new painting sheet is sent between the molds to move to the next injection molding process.
【００２０】振動打ち抜き刃１１ａ及び副振動打ち抜き
刃１１ｂは図８に示すように、打ち抜き刃、刃の固定治
具、４本の支持棒、振動子及び電線から構成されてい
る。打ち抜き刃３１ａ及び３１ｂは図８に示すような形
状をしており、固定治具３３によって４本の支持棒３２
に固定されている。また、刃先の先端形状は、打ち抜き
刃３１ａの場合は、図９（ｂ）に示すように、刃先のよ
うに先鋭化しており、打ち抜き刃３１ｂの場合は、図９
（ａ）に示すように、その先端が平坦になっている。As shown in FIG. 8, the vibration punching blade 11a and the sub-vibration punching blade 11b are composed of a punching blade, a blade fixing jig, four support rods, a vibrator and an electric wire. The punching blades 31a and 31b are shaped as shown in FIG.
It is fixed to. In the case of the punching blade 31a, the tip shape of the cutting edge is sharpened as shown in FIG. 9B, and in the case of the punching blade 31b, it is sharpened as shown in FIG.
As shown in (a), the tip is flat.
【００２１】図１０は上記振動打ち抜き刃を両金型に装
着場合の図であり、図１０（ａ）に示すように、打ち抜
き刃３１ｂは雌型金型のキャビティ７を取り囲むように
なっており、打ち抜き刃３１ｂに接続している支持棒３
２の移動により金型内で前進、後退できるようになって
いる。また、打ち抜き刃３１ａは雄型金型のコア８を取
り囲むようになっているが、大きさは打ち抜き刃３１ｂ
と同じであり、絵付けシートを打ち抜く場合は、支持棒
３２の移動により、雌型金型１の方まで入るようになっ
ている。FIG. 10 is a view showing the case where the vibration punching blade is mounted on both dies. As shown in FIG. 10 (a), the punching blade 31b surrounds the cavity 7 of the female die. , Support rod 3 connected to punching blade 31b
The movement of No. 2 makes it possible to move forward and backward in the mold. Further, the punching blade 31a surrounds the core 8 of the male mold, but the size thereof is
In the case of punching a painting sheet, the support bar 32 is moved so as to enter the female mold 1.
【００２２】打ち抜き刃を振動させるには、刃の固定治
具に取り付けた振動発生装置により、周波数５０サイク
ル、片振幅０．２５ｍｍの正弦波を励振させると、刃先
は例えば図１１に示すような波形で振動する。この振動
により、振動打ち抜き刃１１ａと副振動打ち抜き刃１１
ｂに挟まれた絵付けシートは刃の形状に従って自己発熱
して軟化し更に流動状態となる。振動発生装置の取り付
け位置としては、上記以外に支持棒と進退装置の接続部
分等打ち抜き刃を振動させる場所であればよく、特に指
定するものではない。In order to vibrate the punching blade, when a sine wave having a frequency of 50 cycles and a single amplitude of 0.25 mm is excited by a vibration generator attached to a fixing jig of the blade, the blade edge becomes as shown in FIG. 11, for example. Vibrates in a waveform. Due to this vibration, the vibration punching blade 11a and the sub-vibration punching blade 11
The painting sheet sandwiched between b is self-heated and softened according to the shape of the blade, and becomes a fluid state. The mounting position of the vibration generating device is not particularly specified as long as it is a place where the punching blade is vibrated, such as a connection portion between the support rod and the reciprocating device, in addition to the above.
【００２３】振動の様式として、定常波の他に、振動打
ち抜き刃及び副振動打ち抜き刃の外周に沿って波面が時
計回り又は反時計回りに循環する進行波となるように励
振することもできる。具体的には、図１２に示すよう
に、打ち抜き刃３１ａ及び打ち抜き刃３１ｂの外周方向
にＮ個の振動発生装置を略等間隔に配置し、各振動発生
装置１２1 、１２2 、１２3 、・・・・１２N に、図１
３のような、ｎ相交流φ1 、φ2 、φ3 、・・・・φn
を順番につないで順次励振することにより、打ち抜き刃
先端は外周方向に周回する進行波を生じせしめる（図１
３（ａ）〜（ｄ）参照）。こうすることにより、打ち抜
き刃先端に外周方向に循環する剪断応力や摩擦力を加え
ることができ、一層効率良く打ち抜くことができる。In addition to the standing wave, the vibration may be excited so that the wave front circulates clockwise or counterclockwise along the outer periphery of the vibration punching blade and the sub-vibration punching blade. Specifically, as shown in FIG. 12, N vibration generators are arranged at substantially equal intervals in the outer circumferential direction of the punching blade 31a and the punching blade 31b, and each of the vibration generators 12 1 , 12 2 , 12 3 , .... 12 N
3, n-phase alternating currents φ 1 , φ 2 , φ 3 ,... Φ n
Are sequentially connected to each other, and the tip of the punching blade generates a traveling wave circling in the outer peripheral direction (FIG. 1).
3 (a) to (d)). By doing so, a shearing stress or frictional force circulating in the outer peripheral direction can be applied to the tip of the punching blade, and the punching can be performed more efficiently.
【００２４】[0024]
【本発明の効果】本発明によれば、絵付けシートを金型
内に挿入して射出成形を行い、成形品に絵付けした後
に、インラインで絵付けシートの打ち抜きを行うので、
生産性を低下させることなく、精度のよい絵付け成形品
を得ることができる。加えて、刃の磨耗、変形等も生じ
にくい。According to the present invention, the painting sheet is inserted in a mold, injection molded, painted on a molded product, and then the painting sheet is punched in-line.
A highly accurate painted molded product can be obtained without reducing productivity. In addition, the blade is less likely to be worn or deformed.
【図１】本発明の射出成形同時絵付け装置の概略説明
図。FIG. 1 is a schematic explanatory view of a simultaneous injection molding painting apparatus of the present invention.
【図２】雌型金型と雄型金型の間に絵付けシートを配置
した図。FIG. 2 is a diagram in which a painting sheet is arranged between a female mold and a male mold.
【図３】雌型金型にて絵付けシートを真空成形により予
備成形した図。FIG. 3 is a diagram in which a painting sheet is preformed by vacuum forming using a female mold.
【図４】図３で絵付けシートを予備成形した後、型締め
して射出成形した図。FIG. 4 is a diagram in which a painting sheet is preformed, is clamped, and injection molded in FIG. 3;
【図５】射出成形後に、振動打ち抜き刃で絵付けシート
を打ち抜く時の説明図。FIG. 5 is an explanatory diagram when a painting sheet is punched by a vibration punching blade after injection molding.
【図６】射出成形、絵付けシートの打ち抜き後に、型開
きした時の状態図。FIG. 6 is a state diagram when the mold is opened after injection molding and punching of a painting sheet.
【図７】打ち抜いた後の残りの絵付けシートと絵付け成
形品を示した図。FIG. 7 is a diagram showing a remaining painting sheet and a painting product after punching.
【図８】（ａ） 副振動打ち抜き刃の斜視図。 （ｂ） 振動打ち抜き刃の斜視図。FIG. 8A is a perspective view of a sub-vibration punching blade. (B) A perspective view of the vibration punching blade.
【図９】（ａ） 打ち抜き刃３１ｂのＸ−Ｘ面の断面
図。 （ｂ） 打ち抜き刃３１ａのＹ−Ｙ面の断面図。FIG. 9A is a cross-sectional view of the punching blade 31b taken along the line XX. (B) Sectional drawing of the YY plane of the punching blade 31a.
【図１０】（ａ） 副振動打ち抜き刃を雌型金型に装着
したときの説明図 （ｂ） 振動打ち抜き刃を雄型金型に装着したときの説
明図FIG. 10 (a) is an explanatory view when a sub-vibration punching blade is attached to a female mold; and (b) is an explanatory view when a vibratory punching blade is attached to a male mold.
【図１１】（ａ） 振動打ち抜き刃の振動波形を示した
図。 （ｂ） 振動打ち抜き刃の振動波形の一部の拡大図。FIG. 11A shows a vibration waveform of a vibration punching blade. (B) An enlarged view of a part of the vibration waveform of the vibration punching blade.
【図１２】打ち抜き刃の振動を循環進行波にするために
振動発生装置を取り付けた図。FIG. 12 is a diagram in which a vibration generator is attached to make the vibration of the punching blade a circulating traveling wave.
【図１３】ｎ相交流の各相の電圧波形を示す図であり、 （ａ） 第１相の交流電圧の波形を示す図。 （ｂ） 第２相の交流電圧の波形を示す図。 （ｃ） 第３相の交流電圧の波形を示す図。 （ｄ） 第ｎ相の交流電圧の波形を示す図。13A and 13B are diagrams showing voltage waveforms of each phase of an n-phase alternating current, and FIG. 13A is a diagram showing a waveform of an AC voltage of a first phase. (B) The figure which shows the waveform of the alternating current voltage of a 2nd phase. (C) The figure which shows the waveform of the AC voltage of a 3rd phase. (D) The figure which shows the waveform of AC voltage of the n-th phase.
１ 雌型金型 ２ 雄型金型 ３ 絵付けシート ４ 加熱盤 ５ 移動盤 ６ 固定盤 ７ 雌型金型のキャビティ ８ 雄型金型のコア ９ 見当合わせマーク １１ａ 振動打ち抜き刃 １１ｂ 副振動打ち抜き刃 １２ 振動発生装置 １３ 進退装置 １４ 振動子 １５ 電線 ２１ 油圧シリンダー ２２ ピストン ２３ 射出ゲート ２４ 射出ノズル ２５ 吸気孔 ２６ 吸引用接続パイプ ３１ａ 打ち抜き刃（振動打ち抜き刃用） ３１ｂ 打ち抜き刃（副振動打ち抜き刃用） ３２ 固定支持棒 ３３ 打ち抜き刃固定治具 ３４ 雌型金型のフランジ ３５ 雄型金型のフランジ ４１ 射出成形品 ４２ 溶融樹脂 ４３ 絵付け成形品 ４４ 成形品のバリ φ 励振電圧 DESCRIPTION OF SYMBOLS 1 Female mold 2 Male mold 3 Painting sheet 4 Heating board 5 Moving board 6 Fixed board 7 Female mold cavity 8 Male mold core 9 Registration mark 11a Vibration punching blade 11b Secondary vibration punching blade DESCRIPTION OF SYMBOLS 12 Vibration generator 13 Reciprocating device 14 Vibrator 15 Electric wire 21 Hydraulic cylinder 22 Piston 23 Injection gate 24 Injection nozzle 25 Intake hole 26 Suction connection pipe 31a Punching blade (for vibration punching blade) 31b Punching blade (for sub-vibration punching blade) 32 Fixed support rod 33 Punching blade fixing jig 34 Female mold flange 35 Male mold flange 41 Injection molded product 42 Molten resin 43 Painting molded product 44 Mold burr φ Excitation voltage
Claims (2)
シートを挿入して、射出成形を行う射出成形同時絵付け
方法において、金型キャビティの周縁部を囲遶し、且つ
絵付けシートを表裏両面から挟むように設けた一対の振
動打ち抜き刃により、射出成形中又は射出成形後に型開
きする迄の間に、刃に機械的に振動を励起させ、片方の
刃を前進させ、もう片方の刃を後退させつつ、成形品周
辺の余剰シートを局部的に加熱溶断した後に両金型を型
開きして、絵付け射出成形品を得ることを特徴とする射
出成形同時絵付け方法。In an injection molding simultaneous painting method in which a painting sheet is inserted between a female mold and a male mold of an injection molding apparatus to perform injection molding, a peripheral portion of a mold cavity is surrounded and painted. By a pair of vibration punching blades provided so as to sandwich the attached sheet from both front and back sides, during injection molding or before opening the mold after injection molding, mechanically excite the blades to vibrate, advance one blade, Injection molding simultaneous painting method characterized in that, while retreating the other blade, the excess sheet around the molded product is locally heated and melted, then both molds are opened to obtain a painted injection molded product. .
挿入して、射出成形と同時に絵付けを行う射出成形装置
において、金型キャビティの周縁部を囲遶し、且つ絵付
けシートを表裏両面から挟むようにした一対の刃を両金
型に設け、更に、該一対の刃を、振動するための振動発
生装置と、前進、後退させるための駆動装置とを金型内
に設けたことを特徴とする射出成形同時絵付け装置。2. An injection molding apparatus for performing painting simultaneously with injection molding by inserting a painting sheet between a female mold and a male mold of a mold. A pair of blades are provided on both dies so that the attachment sheet is sandwiched from both front and back sides. Further, a vibration generator for vibrating the pair of blades and a driving device for moving the blade forward and backward are provided in the die. Injection molding simultaneous painting apparatus characterized by being provided in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32957393A JP3328859B2 (en) | 1993-12-02 | 1993-12-02 | Injection molding simultaneous painting method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32957393A JP3328859B2 (en) | 1993-12-02 | 1993-12-02 | Injection molding simultaneous painting method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07156201A JPH07156201A (en) | 1995-06-20 |
| JP3328859B2 true JP3328859B2 (en) | 2002-09-30 |
Family
ID=18222864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32957393A Expired - Lifetime JP3328859B2 (en) | 1993-12-02 | 1993-12-02 | Injection molding simultaneous painting method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3328859B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007320202A (en) * | 2006-06-01 | 2007-12-13 | Koto Engraving Corp | In-mold molding method, mold for in-mold molding, and in-mold molding apparatus |
| DE102011103824B4 (en) * | 2011-06-01 | 2024-02-01 | Leonhard Kurz Stiftung & Co. Kg | Process for producing in-mold decorated plastic moldings |
| JP5568058B2 (en) * | 2011-06-03 | 2014-08-06 | 中本パックス株式会社 | Manufacturing method of molded products |
| CN105619692B (en) * | 2015-12-31 | 2018-01-09 | 青岛海信模具有限公司 | A kind of turntable type bicolor injection mould and its Shooting Technique with decorative membrance |
-
1993
- 1993-12-02 JP JP32957393A patent/JP3328859B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07156201A (en) | 1995-06-20 |
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