JP4431441B2 - Injection molding method and injection molding apparatus - Google Patents

Injection molding method and injection molding apparatus Download PDF

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JP4431441B2
JP4431441B2 JP2004157849A JP2004157849A JP4431441B2 JP 4431441 B2 JP4431441 B2 JP 4431441B2 JP 2004157849 A JP2004157849 A JP 2004157849A JP 2004157849 A JP2004157849 A JP 2004157849A JP 4431441 B2 JP4431441 B2 JP 4431441B2
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cavity
mold
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injection molding
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進 斎藤
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フィーサ株式会社
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    • 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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • 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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C2045/7368—Heating or cooling of the mould combining a heating or cooling fluid and non-fluid means

Description

本発明はウエルドラインを抑制する射出成形法及び射出成形装置に関する。   The present invention relates to an injection molding method and an injection molding apparatus that suppress weld lines.

熱可塑性樹脂又は熱硬化性樹脂の射出成形装置において、固定型と可動型とからなる金型（モールド）のキャビティを効率よく短時間に加熱するためには、例えば、特許文献１に記載の技術が知られている。   In an injection molding apparatus for thermoplastic resin or thermosetting resin, in order to efficiently heat a cavity of a mold (mold) composed of a fixed mold and a movable mold in a short time, for example, a technique described in Patent Document 1 It has been known.

特許文献１の技術は、成形品のヒズミ抑制を目的とするものであり、固定型と可動型の各々の周囲にＩＨコイルを配設することでキャビティの加熱を行っている。   The technique of Patent Document 1 aims to suppress distortion of a molded product, and the cavity is heated by disposing an IH coil around each of a fixed mold and a movable mold.

また、キャビティの加熱ではなく、射出ノズルの先端部の周囲にＩＨコイルを配設して該先端部を加熱することで加圧ガス体の溶融樹脂内部への円滑な注入を目的とする技術が特許文献２に記載されている。   Also, there is a technique for smooth injection of a pressurized gas body into the molten resin by arranging an IH coil around the tip of the injection nozzle and heating the tip instead of heating the cavity. It is described in Patent Document 2.

上記特許文献１及び２の技術は、本発明の対象とする成形品のウエルドライン抑制を目的とする技術ではなく、ウエルドライン抑制のためにＩＨコイルを用いる技術としては特許文献３が知られている。   The techniques of Patent Documents 1 and 2 are not techniques for suppressing the weld line of the molded article that is the subject of the present invention, but Patent Document 3 is known as a technique of using an IH coil for suppressing the weld line. Yes.

この特許文献３の技術は、金型（モールド）中にＩＨコイルを埋設する構成を有している。本発明者の研究によれば、この特許文献３の構成では、充分な効果は得られていないことが判った。   The technique of Patent Document 3 has a configuration in which an IH coil is embedded in a mold. According to the research of the present inventor, it has been found that the configuration of Patent Document 3 does not provide a sufficient effect.

特公平７−１０５４９号公報Japanese Patent Publication No. 7-10549 特許第２９４９７７９号公報Japanese Patent No. 2949779 特表平１１−５０２７８１号公報Japanese National Patent Publication No. 11-502781

そこで本発明の課題は、金型（モールド）を効率よく温度制御することでウエルドラインを効果的に抑制することのできる射出成形法及び射出成形装置を提供することにある。   Therefore, an object of the present invention is to provide an injection molding method and an injection molding apparatus capable of effectively suppressing a weld line by efficiently controlling the temperature of a mold (mold).

上記課題を解決する本発明は下記構成を有する。   The present invention for solving the above problems has the following configuration.

１．下記（１）、（２）又は（３）に示される射出成形法において、
キャビティに対向し、且つ相互に対向するように設けられた凹部の表面が波形であることを特徴とする射出成形法。
（１）固定型と可動型とからなる金型（モールド）の各々に、
キャビティに対向し、且つ相互に対向するように凹部を設け、該凹部の各々にＩＨコイルを配設して前記キャビティの加熱制御を行うと共に、
前記凹部を取り囲むように環状溝を設け、該環状溝の各々に冷媒路を配設して前記キャビティの冷却を行う構成。
（２）固定型と可動型とからなる金型（モールド）の各々に、
キャビティに対向し、且つ相互に対向するように凹部を設け、該凹部の各々にＩＨコイルを配設して前記キャビティの加熱制御を行うと共に、
前記凹部の各々に冷媒路を配設して前記キャビティの冷却を行う構成。
（３）固定型と可動型とからなる金型（モールド）の各々に、
キャビティに対向し、且つ相互に対向するように凹部を設け、該凹部の各々に冷媒路を配設して前記キャビティの冷却を行うと共に、
前記凹部を取り囲むように環状溝を設け、該環状溝の各々にＩＨコイルを配設して前記キャビティの加熱制御を行う構成。 1. In the injection molding method shown in the following (1), (2) or (3),
An injection molding method characterized in that the surfaces of the concave portions provided so as to face the cavities and face each other are corrugated .
(1) For each mold (mold) composed of a fixed mold and a movable mold,
A recess is provided so as to face the cavity and face each other, and an IH coil is disposed in each of the recesses to control heating of the cavity.
An annular groove provided so as to surround the recess, configuration which is disposed a coolant passage in each of the annular grooves for cooling of the cavity.
(2) For each mold (mold) composed of a fixed mold and a movable mold,
A recess is provided so as to face the cavity and face each other, and an IH coil is disposed in each of the recesses to control heating of the cavity.
A configuration in which a coolant path is provided in each of the recesses to cool the cavity.
(3) In each mold (mold) consisting of a fixed mold and a movable mold,
A recess is provided so as to face the cavity and to face each other, and a coolant path is provided in each of the recesses to cool the cavity,
An annular groove is provided so as to surround the recess, and an IH coil is provided in each of the annular grooves to control heating of the cavity.

２．樹脂の射出前に前記ＩＨコイルによってキャビティを昇温し、射出充填後に前記冷媒路の冷媒によってキャビティを冷却することを特徴とする上記１に記載の射出成形法。 2 . 2. The injection molding method according to 1 above, wherein the temperature of the cavity is raised by the IH coil before injection of the resin, and the cavity is cooled by the refrigerant in the refrigerant path after injection filling.

３．射出前のキャビティを樹脂成形温度の６０〜９０％に昇温することを特徴とする上記２に記載の射出成形法。 3 . 3. The injection molding method according to 2 above, wherein the temperature of the cavity before injection is raised to 60 to 90% of the resin molding temperature.

４．樹脂の射出前に前記冷媒路の冷媒によってキャビティを冷却し、射出充填後に前記ＩＨコイルによってキャビティを加熱制御することを特徴とする上記１に記載の射出成形法。 4. 2. The injection molding method according to 1 above, wherein the cavity is cooled by the refrigerant in the refrigerant path before injection of the resin, and the cavity is heated and controlled by the IH coil after injection filling.

５．下記（１）、（２）又は（３）に示される射出成形装置において、
キャビティに対向し、且つ相互に対向するように設けられた凹部の表面が波形であることを特徴とする射出成形装置。
（１）固定型と可動型とからなる金型（モールド）の各々に、
キャビティに対向し、且つ相互に対向するように凹部が設けられ、該凹部の各々にＩＨコイルが配設されていると共に、
前記凹部を取り囲むように環状溝が設けられ、該環状溝の各々に冷媒路が配設されている構成。
（２）固定型と可動型とからなる金型（モールド）の各々に、
キャビティに対向し、且つ相互に対向するように凹部が設けられ、該凹部の各々にＩＨコイルが配設されていると共に、
前記凹部の各々に冷媒路が配設されている構成。
（３）固定型と可動型とからなる金型（モールド）の各々に、
キャビティに対向し、且つ相互に対向するように凹部が設けられ、該凹部の各々に冷媒路が配設されていると共に、
前記凹部を取り囲むように環状溝が設けられ、該環状溝の各々にＩＨコイルが配設されている構成。 5 . In the injection molding apparatus shown in the following (1), (2) or (3),
An injection molding apparatus characterized in that the surfaces of the concave portions provided so as to face the cavities and face each other are corrugated .
(1) For each mold (mold) composed of a fixed mold and a movable mold,
Concave portions are provided so as to face the cavities and face each other, and an IH coil is disposed in each of the concave portions,
An annular groove provided so as to surround the recess, configuration refrigerant passage is disposed in each of the annular grooves.
(2) For each mold (mold) composed of a fixed mold and a movable mold,
Concave portions are provided so as to face the cavities and face each other, and an IH coil is disposed in each of the concave portions,
A configuration in which a refrigerant path is disposed in each of the recesses.
(3) In each mold (mold) consisting of a fixed mold and a movable mold,
Concave portions are provided so as to face the cavities and face each other, and a refrigerant path is disposed in each of the concave portions,
An annular groove is provided so as to surround the recess, and an IH coil is disposed in each of the annular grooves.

６．前記環状溝が波形又は上下若しくは下方に突き抜けた直線状であることを特徴とする上記５に記載の射出成形装置。 6 . 6. The injection molding apparatus as described in 5 above, wherein the annular groove has a wave shape or a straight shape penetrating vertically or downward.

７．樹脂の射出前に前記ＩＨコイルによってキャビティが昇温され、射出充填後に前記冷媒路の冷媒によってキャビティが冷却される構成であることを特徴とする上記５又は６に記載の射出成形装置。 7 . 7. The injection molding apparatus according to 5 or 6 above, wherein the cavity is heated by the IH coil before injection of the resin, and the cavity is cooled by the refrigerant in the refrigerant path after injection filling.

８．射出前のキャビティが樹脂成形温度の６０〜９０％に昇温される構成であることを特徴とする上記７に記載の射出成形装置。 8 . 8. The injection molding apparatus as described in 7 above, wherein the cavity before injection is heated to 60 to 90% of the resin molding temperature.

９．樹脂の射出前に前記冷媒路の冷媒によってキャビティが冷却され、射出充填後に前記ＩＨコイルによってキャビティが加熱制御される構成であることを特徴とする上記５又は６に記載の射出成形装置。 9 . 7. The injection molding apparatus according to 5 or 6 above, wherein the cavity is cooled by the refrigerant in the refrigerant path before injection of the resin, and the cavity is heated and controlled by the IH coil after injection filling.

請求項１及び６に示す本発明によれば、金型（モールド）のキャビティに対向する位置に相互に対向する凹部を設け、該凹部の各々にＩＨコイルを配設し、さらに、前記凹部を取り囲むように設けた環状溝の各々に冷媒路を配設、即ち、ＩＨコイル及び冷媒路を金型（モールド）に埋設するのではなく外装した構成を有してＩＨコイルと冷媒を併用してキャビティの加熱制御及び冷却を行うので、成形品のウエルドラインを効果的に抑制することができる。   According to the first and sixth aspects of the present invention, recesses facing each other are provided at positions facing a cavity of a mold (mold), an IH coil is provided in each of the recesses, and the recesses are further provided. A refrigerant path is provided in each of the annular grooves provided so as to surround, that is, the IH coil and the refrigerant path are not embedded in a mold (mold) but are externally provided, and the IH coil and the refrigerant are used together. Since the heating control and cooling of the cavity are performed, the weld line of the molded product can be effectively suppressed.

請求項２及び７に示す本発明によれば、金型（モールド）のキャビティに対向する位置に相互に対向する凹部を設け、該凹部の各々に冷媒路を配設し、さらに、前記凹部を取り囲むように設けた環状溝の各々にＩＨコイルを配設、即ち、冷媒路及びＩＨコイルを金型（モールド）に埋設するのではなく外装した構成を有してＩＨコイルと冷媒を併用してキャビティの加熱制御及び冷却を行うので、成形品のウエルドラインを効果的に抑制することができる。   According to the second and seventh aspects of the present invention, the concave portions facing each other are provided at positions facing the cavities of the mold (mold), the refrigerant path is disposed in each of the concave portions, and the concave portions are further provided. An IH coil is provided in each of the annular grooves provided so as to surround, that is, the refrigerant path and the IH coil are not embedded in a mold (mold) but are externally arranged, and the IH coil and the refrigerant are used together. Since the heating control and cooling of the cavity are performed, the weld line of the molded product can be effectively suppressed.

請求項８に示す本発明によれば、凹部の表面を波形としたので、該凹部の表面積を大とすることできるため熱効率が上がる。   According to the eighth aspect of the present invention, since the surface of the recess is corrugated, the surface area of the recess can be increased, so that the thermal efficiency is increased.

請求項３及び９に示す本発明によれば、樹脂射出前にＩＨコイルによりキャビティを昇温し、射出充填後に冷媒によってキャビティを冷却するので、熱可塑性樹脂の射出成形において溶融樹脂のヒートショックが減少して流動性が良好となるので、成形品の光沢やウエルドライン等の表層の様々な模様を消去できるだけでなく、成形残留歪みが減少し強度増大が可能となる。   According to the third and ninth aspects of the present invention, the temperature of the cavity is raised by the IH coil before the resin injection, and the cavity is cooled by the refrigerant after the injection filling, so that the heat shock of the molten resin is caused in the injection molding of the thermoplastic resin. Since the fluidity is decreased and the flowability is improved, not only various patterns on the surface layer such as gloss and weld lines of the molded product can be erased, but the molding residual distortion can be reduced and the strength can be increased.

請求項４及び１０に示す本発明によれば、請求項３及び９の射出前のキャビティを樹脂成形温度の６０〜９０％に昇温するので、上記請求項３及び９による効果がより顕著となる。   According to the present invention as set forth in claims 4 and 10, since the cavity before injection of claims 3 and 9 is heated to 60 to 90% of the resin molding temperature, the effects of claims 3 and 9 are more prominent. Become.

請求項５及び１１に示す本発明によれば、樹脂射出前に冷媒によりキャビティを冷却し、射出充填後にＩＨコイルによってキャビティを加熱するので、熱硬化性樹脂の射出成形において溶融樹脂のヒートショックが減少して流動性が良好となり、成形品の光沢やウエルドライン等の表層の様々な模様を消去できるだけでなく、成形残留歪みが減少し強度増大が可能となる。   According to the fifth and eleventh aspects of the present invention, since the cavity is cooled by the refrigerant before the resin injection and the cavity is heated by the IH coil after the injection filling, the heat shock of the molten resin is caused in the injection molding of the thermosetting resin. This reduces the fluidity, and not only erases various patterns on the surface layer such as the gloss and weld lines of the molded product, but also reduces the molding residual strain and increases the strength.

次に、添付の図面に従って本発明を更に詳細に説明する。
図１は本発明に係る射出成形装置の第１実施例を示す概略断面図、図２は図１のＩＩ−ＩＩ線概略横断面図、図３は本発明に係る射出成形装置の第２実施例を示す概略断面図、図４は図３の概略底面図である。 The present invention will now be described in more detail with reference to the accompanying drawings.
1 is a schematic sectional view showing a first embodiment of an injection molding apparatus according to the present invention, FIG. 2 is a schematic transverse sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a second embodiment of the injection molding apparatus according to the present invention. FIG. 4 is a schematic bottom view of FIG. 3.

先ず、図１に基づき請求項１の（１）及び請求項５の（１）に示す本発明の第１実施例について説明する。 First, a first embodiment of the present invention shown in (1) of claim 1 and (1) of claim 5 will be described with reference to FIG.

図１に示すように、本発明に係る射出成形装置は、固定型１１と可動型１２とからなり、キャビティ１３を有する金型（モールド）１と、該キャビティ１３に対向し、且つ相互に対向するように設けられた凹部１４・１５と、該凹部１４・１５の各々にＩＨコイル２が絶縁耐熱シート１８を介して配設されていると共に、前記凹部１４・１５を取り囲むように環状溝１６・１７が設けられ、該環状溝１６・１７の各々に冷媒路３が配設されている構成である。即ち、例えば、環状溝１６・１７の各々を囲むように遮蔽体１９を冠せることで冷媒路３が形成される。   As shown in FIG. 1, an injection molding apparatus according to the present invention includes a fixed mold 11 and a movable mold 12, a mold (mold) 1 having a cavity 13, the cavity 13 and the mold 13. The IH coil 2 is disposed in each of the recesses 14 and 15 with the insulating heat-resistant sheet 18 interposed therebetween, and the annular groove 16 so as to surround the recesses 14 and 15. 17 is provided, and the refrigerant path 3 is disposed in each of the annular grooves 16 and 17. That is, for example, the refrigerant path 3 is formed by putting the shield 19 so as to surround each of the annular grooves 16 and 17.

ＩＨコイル２は、図２に示すようにキャビティ１３を囲むように巻き配設されている。   The IH coil 2 is wound around the cavity 13 as shown in FIG.

冷媒路３は、例えば、上記のように環状溝１６・１７に遮蔽体１９を冠せて形成されており、環状溝１６・１７の各々には、図２に示すように、少なくとも１つの冷媒路入口３１と冷媒路出口３２が設けられている。   The refrigerant path 3 is formed, for example, with the annular grooves 16 and 17 having the shields 19 crowned as described above, and each of the annular grooves 16 and 17 has at least one refrigerant as shown in FIG. A passage inlet 31 and a refrigerant passage outlet 32 are provided.

樹脂の射出はバルブノズル４により行われる。バルブノズル４としては、公知公用のバルブノズルを特別の制限なく用いることができる。尚、本実施例では、バルブノズル４の先端のゲート部分がキャビティ１３に直結する態様であるが、該バルブノズル４の先端とキャビティ１３との間にランナーが存在していてもよいことは勿論である。尚また、樹脂の射出手段はバルブノズル４に限らず、この種の射出成形装置に用いられる公知公用の射出手段を特別の制限なく用いることができる。   Resin is injected by the valve nozzle 4. As the valve nozzle 4, a publicly known valve nozzle can be used without any particular limitation. In the present embodiment, the gate portion at the tip of the valve nozzle 4 is directly connected to the cavity 13, but it goes without saying that a runner may exist between the tip of the valve nozzle 4 and the cavity 13. It is. In addition, the resin injection means is not limited to the valve nozzle 4, and any publicly known injection means used in this type of injection molding apparatus can be used without any particular limitation.

射出する樹脂としては、熱可塑性樹脂、熱硬化性樹脂のいずれも適用することができる。   As the resin to be injected, either a thermoplastic resin or a thermosetting resin can be applied.

熱可塑性樹脂の場合は、射出前に前記ＩＨコイル２によってキャビティ１３が昇温され、射出充填後に前記冷媒路３の冷媒によってキャビティ１３が冷却される。   In the case of a thermoplastic resin, the cavity 13 is heated by the IH coil 2 before injection, and the cavity 13 is cooled by the refrigerant in the refrigerant path 3 after injection filling.

射出前のキャビティ１３の昇温温度としては、射出される熱可塑性樹脂の成形温度の６０〜９０％であることが好ましい。   The temperature rise temperature of the cavity 13 before injection is preferably 60 to 90% of the molding temperature of the injected thermoplastic resin.

樹脂射出前にＩＨコイル２によりキャビティ１３を昇温し、射出充填後に冷媒によってキャビティ１３を冷却することによって、熱可塑性樹脂の射出成形において溶融樹脂のヒートショックが減少して流動性が良好となるので、成形品の光沢やウエルドライン等の表層の様々な模様を消去できるだけでなく、成形残留歪みが減少し強度増大が可能となる。特に、射出前のキャビティ１３を樹脂成形温度の６０〜９０％に昇温することで、上記効果はより顕著となる。   The temperature of the cavity 13 is raised by the IH coil 2 before the resin injection, and the cavity 13 is cooled by the refrigerant after the injection filling, whereby the heat shock of the molten resin is reduced in the injection molding of the thermoplastic resin and the fluidity is improved. Therefore, not only various patterns on the surface layer such as the gloss and weld lines of the molded product can be erased, but the residual molding distortion can be reduced and the strength can be increased. In particular, the above effect becomes more remarkable by raising the temperature of the cavity 13 before injection to 60 to 90% of the resin molding temperature.

熱硬化性樹脂の場合は、射出前に前記冷媒路３の冷媒によってキャビティ１３が冷却され、射出充填後に前記ＩＨコイル２によってキャビティ１３が加熱制御される。   In the case of a thermosetting resin, the cavity 13 is cooled by the refrigerant in the refrigerant path 3 before injection, and the cavity 13 is heated and controlled by the IH coil 2 after injection filling.

冷媒路３の冷媒による冷却温度としては限定的ではなく、一例として４５〜５５℃であり、ＩＨコイル２による加熱温度としては限定的でなく、一例として熱硬化樹脂の反応温度域である６０〜８０℃である。   The cooling temperature by the refrigerant in the refrigerant path 3 is not limited, but is 45 to 55 ° C. as an example, the heating temperature by the IH coil 2 is not limited, and is 60 to 60 ° which is a reaction temperature range of thermosetting resin as an example. 80 ° C.

樹脂射出前に冷媒路３の冷媒によりキャビティ１３を冷却し、射出充填後にＩＨコイル２によってキャビティ１３を加熱することによって、熱硬化性樹脂の射出成形において溶融樹脂のヒートショックが減少して流動性が良好となるので、成形品の光沢やウエルドライン等の表層の様々な模様を消去できるだけでなく、成形残留歪みが減少し強度増大が可能となる。   The cavity 13 is cooled by the refrigerant in the refrigerant path 3 before the resin injection, and the cavity 13 is heated by the IH coil 2 after the injection filling, so that the heat shock of the molten resin is reduced in the injection molding of the thermosetting resin. Therefore, not only can the various patterns on the surface layer such as the gloss and weld lines of the molded product be erased, but the molding residual distortion can be reduced and the strength can be increased.

前記凹部１４・１５は、図１に示すように表面が波形である。凹部１４・１５の表面を波形とすることで、該凹部１４・１５の表面積を大とすることできるため熱効率が上がる。尚、金型１としては、固定型１１と可動型１２とからなる射出成形用金型であれば、公知公用のものを特別の制限なく用いることができる。 The recesses 14, 15, Ru surface wave der As shown in FIG. By making the surface of the recesses 14 and 15 corrugated, the surface area of the recesses 14 and 15 can be increased, so that the thermal efficiency is increased. As the mold 1, if injection molding mold comprising a fixed mold 11 and movable mold 12., may be used without particular limitation known public.

ＩＨコイル２としては、公知公用の高周波誘電加熱法によるＩＨコイルを用いることができる。   As the IH coil 2, an IH coil by a publicly known high frequency dielectric heating method can be used.

高周波誘電加熱法について説明する。
鉄を多く含む金属の周囲または近くにコイルを配設して、コイルに交流の電流が流れると磁力線が発生する。磁力線は金属を通過するが、交流は大きさや向きが絶えず変化するため、発生する磁力線も絶えず変化することになる。このように金属に磁力線の変化を与えると、電磁誘導作用によって渦電流が流れ鉄系金属は抵抗が大きいので熱くなる。電磁誘導作用とは、磁力線の変化がコイルに電気を誘導する働きをいう。本発明では、例えば、１５ＫＨｚ〜１００ＫＨｚを用いる。この高周波は鉄系金属加熱に適していて、効率がよく、急速に加熱が可能である。 The high frequency dielectric heating method will be described.
When a coil is disposed around or near a metal containing a large amount of iron and an alternating current flows through the coil, lines of magnetic force are generated. Although the lines of magnetic force pass through the metal, the magnitude and direction of the alternating current constantly changes, so the generated magnetic field lines also change constantly. When magnetic field lines are changed in this way, eddy currents flow due to electromagnetic induction, and iron-based metals have high resistance and become hot. The electromagnetic induction effect is a function in which a change in magnetic field lines induces electricity in the coil. In the present invention, for example, 15 KHz to 100 KHz is used. This high frequency is suitable for iron-based metal heating, is efficient, and can be heated rapidly.

冷媒路３の冷媒としては、圧縮エアや水等の公知公用の冷媒を用いることができる。また、冷媒路３は本実施例のような遮蔽体１９を環状溝１６・１７に冠せて形成された態様に限らず、例えば、環状溝１６・１７に冷媒を内包（通気、通液）する管を配設する態様とすることもできる。   As the refrigerant in the refrigerant path 3, known publicly available refrigerants such as compressed air and water can be used. Further, the refrigerant path 3 is not limited to the aspect in which the shield 19 is formed in the annular grooves 16 and 17 as in the present embodiment. For example, the refrigerant is included in the annular grooves 16 and 17 (ventilation, liquid passage). It is also possible to adopt a mode in which a pipe is arranged.

尚、請求項２及び８に示される本発明における冷媒路３に用いられる冷媒としては、圧縮エアの如き気体であることが好ましい。   In addition, as a refrigerant | coolant used for the refrigerant path 3 in this invention shown by Claim 2 and 8, it is preferable that it is gas like compressed air.

次に、図３及び図４に基づき請求項１の（３）及び請求項５の（３）に示す本発明の第２実施例について説明する。 Next, a second embodiment of the present invention shown in (3) of claim 1 and (3) of claim 5 will be described with reference to FIGS.

図３に示すように、本発明に係る射出成形装置は、固定型１１と可動型１２とからなり、キャビティ１３を有する金型（モールド）１と、該キャビティ１３に対向し、且つ相互に対向するように設けられた凹部１４・１５と、該凹部１４・１５の各々に冷媒路３が配設されていると共に、前記凹部１４・１５を取り囲むように環状溝１６・１７が設けられ、該環状溝１６・１７の各々にＩＨコイル２が絶縁耐熱シート１８を介して配設されている構成である。３１は冷媒路入口、３２は冷媒路出口を示す。   As shown in FIG. 3, the injection molding apparatus according to the present invention includes a fixed mold 11 and a movable mold 12. The mold (mold) 1 having a cavity 13 faces the cavity 13 and faces each other. The recesses 14 and 15 are provided in such a manner that the coolant passage 3 is disposed in each of the recesses 14 and 15 and annular grooves 16 and 17 are provided so as to surround the recesses 14 and 15. In this configuration, the IH coil 2 is disposed in each of the annular grooves 16 and 17 via an insulating heat resistant sheet 18. Reference numeral 31 denotes a refrigerant passage inlet, and 32 denotes a refrigerant passage outlet.

第２実施例における環状溝１６・１７は、図３に示すように溝部分の端部が、固定型１１においては上方（図面上において上方向）に、可動型１２においては下方（図面上において下方向）に突き抜けた直線状となっている。従って、環状溝１６・１７に配設したＩＨコイル２のメンテナンス等（交換を含む）の際には、固定型１１のＩＨコイル２は上方向に、可動型１２のＩＨコイル２は下方向に各々容易に取り外すことができるのでメンテナンス性が高い。   As shown in FIG. 3, the annular grooves 16 and 17 in the second embodiment are such that the end portions of the groove portions are upward (upward in the drawing) in the fixed mold 11 and downward (in the drawing in the movable mold 12). It is a straight line that penetrates downward. Accordingly, during maintenance (including replacement) of the IH coil 2 disposed in the annular grooves 16 and 17, the IH coil 2 of the fixed mold 11 is directed upward, and the IH coil 2 of the movable mold 12 is directed downward. Since each can be easily removed, maintenance is high.

冷媒路３は、図４に示すようにキャビティ１３を囲むように配設されており、該キャビティ１３及び冷媒路３を囲むようにＩＨコイル２が巻き配設されている。   As shown in FIG. 4, the refrigerant path 3 is disposed so as to surround the cavity 13, and the IH coil 2 is wound around the cavity 13 and the refrigerant path 3.

即ち、上記第１実施例とは、基本的にはＩＨコイル２と冷媒路３の配設位置が入れ替わると共に環状溝１６・１７の形状が異なった構成となっている。かかる構成以外の各構成については上述した第１実施例と同様である。樹脂についても、第１実施例と同様、熱可塑性樹脂と熱硬化性樹脂のいずれにも適用することができる。   That is, the first embodiment basically has a configuration in which the positions of the IH coil 2 and the refrigerant passage 3 are interchanged and the shapes of the annular grooves 16 and 17 are different. Each configuration other than this configuration is the same as that of the first embodiment described above. The resin can be applied to both the thermoplastic resin and the thermosetting resin as in the first embodiment.

本発明に係る射出成形装置の第１実施例を示す概略断面図Schematic sectional view showing a first embodiment of an injection molding apparatus according to the present invention. 図１のＩＩ−ＩＩ線概略横断面図II-II schematic cross-sectional view of FIG. 本発明に係る射出成形装置の第２実施例を示す概略断面図Schematic sectional view showing a second embodiment of the injection molding apparatus according to the present invention 図３の概略底面図Schematic bottom view of FIG.

符号の説明Explanation of symbols

１ 金型（モールド）
１１ 固定型
１２ 可動型
１３ キャビティ
１４・１５ 凹部
１６・１７ 環状溝
１８ 絶縁耐熱シート
１９ 遮蔽体
２ ＩＨコイル
３ 冷媒路
３１ 冷媒路入口
３２ 冷媒路出口
４ バルブノズル 1 Mold
DESCRIPTION OF SYMBOLS 11 Fixed type 12 Movable type 13 Cavity 14/15 Recessed part 16/17 Annular groove 18 Insulation heat-resistant sheet 19 Shield 2 IH coil 3 Refrigerant path 31 Refrigerant path inlet 32 Refrigerant path outlet 4 Valve nozzle

Claims (9)

下記（１）、（２）又は（３）に示される射出成形法において、
キャビティに対向し、且つ相互に対向するように設けられた凹部の表面が波形であることを特徴とする射出成形法。
（１）固定型と可動型とからなる金型（モールド）の各々に、
キャビティに対向し、且つ相互に対向するように凹部を設け、該凹部の各々にＩＨコイルを配設して前記キャビティの加熱制御を行うと共に、
前記凹部を取り囲むように環状溝を設け、該環状溝の各々に冷媒路を配設して前記キャビティの冷却を行う構成。
（２）固定型と可動型とからなる金型（モールド）の各々に、
キャビティに対向し、且つ相互に対向するように凹部を設け、該凹部の各々にＩＨコイルを配設して前記キャビティの加熱制御を行うと共に、
前記凹部の各々に冷媒路を配設して前記キャビティの冷却を行う構成。
（３）固定型と可動型とからなる金型（モールド）の各々に、
キャビティに対向し、且つ相互に対向するように凹部を設け、該凹部の各々に冷媒路を配設して前記キャビティの冷却を行うと共に、
前記凹部を取り囲むように環状溝を設け、該環状溝の各々にＩＨコイルを配設して前記キャビティの加熱制御を行う構成。 In the injection molding method shown in the following (1), (2) or (3),
An injection molding method characterized in that the surfaces of the concave portions provided so as to face the cavities and face each other are corrugated .
(1) For each mold (mold) composed of a fixed mold and a movable mold,
A recess is provided so as to face the cavity and face each other, and an IH coil is disposed in each of the recesses to control heating of the cavity.
An annular groove provided so as to surround the recess, configuration which is disposed a coolant passage in each of the annular grooves for cooling of the cavity.
(2) For each mold (mold) composed of a fixed mold and a movable mold,
A recess is provided so as to face the cavity and face each other, and an IH coil is disposed in each of the recesses to control heating of the cavity.
A configuration in which a coolant path is provided in each of the recesses to cool the cavity.
(3) In each mold (mold) consisting of a fixed mold and a movable mold,
A recess is provided so as to face the cavity and to face each other, and a coolant path is provided in each of the recesses to cool the cavity,
An annular groove is provided so as to surround the recess, and an IH coil is provided in each of the annular grooves to control heating of the cavity. 樹脂の射出前に前記ＩＨコイルによってキャビティを昇温し、射出充填後に前記冷媒路の冷媒によってキャビティを冷却することを特徴とする請求項１に記載の射出成形法。 Heated cavity before injection by the IH coil of the resin, the injection molding method according to claim 1, characterized in that cooling the cavity by the refrigerant of the refrigerant passage after injecting and filling. 射出前のキャビティを樹脂成形温度の６０〜９０％に昇温することを特徴とする請求項２に記載の射出成形法。 The injection molding method according to claim 2 , wherein the temperature of the cavity before injection is raised to 60 to 90% of the resin molding temperature. 樹脂の射出前に前記冷媒路の冷媒によってキャビティを冷却し、射出充填後に前記ＩＨコイルによってキャビティを加熱制御することを特徴とする請求項１に記載の射出成形法。 Injection molding according to claim 1, characterized in that the cavity is cooled before the resin injection by the refrigerant of the refrigerant passage, for heating control cavity by the IH coil after the injection filling. 下記（１）、（２）又は（３）に示される射出成形装置において、
キャビティに対向し、且つ相互に対向するように設けられた凹部の表面が波形であることを特徴とする射出成形装置。
（１）固定型と可動型とからなる金型（モールド）の各々に、
キャビティに対向し、且つ相互に対向するように凹部が設けられ、該凹部の各々にＩＨコイルが配設されていると共に、
前記凹部を取り囲むように環状溝が設けられ、該環状溝の各々に冷媒路が配設されている構成。
（２）固定型と可動型とからなる金型（モールド）の各々に、
キャビティに対向し、且つ相互に対向するように凹部が設けられ、該凹部の各々にＩＨコイルが配設されていると共に、
前記凹部の各々に冷媒路が配設されている構成。
（３）固定型と可動型とからなる金型（モールド）の各々に、
キャビティに対向し、且つ相互に対向するように凹部が設けられ、該凹部の各々に冷媒路が配設されていると共に、
前記凹部を取り囲むように環状溝が設けられ、該環状溝の各々にＩＨコイルが配設されている構成。 In the injection molding apparatus shown in the following (1), (2) or (3),
An injection molding apparatus characterized in that the surfaces of the concave portions provided so as to face the cavities and face each other are corrugated .
(1) For each mold (mold) composed of a fixed mold and a movable mold,
Concave portions are provided so as to face the cavities and face each other, and an IH coil is disposed in each of the concave portions,
An annular groove provided so as to surround the recess, configuration refrigerant passage is disposed in each of the annular grooves.
(2) For each mold (mold) composed of a fixed mold and a movable mold,
Concave portions are provided so as to face the cavities and face each other, and an IH coil is disposed in each of the concave portions,
A configuration in which a refrigerant path is disposed in each of the recesses.
(3) In each mold (mold) consisting of a fixed mold and a movable mold,
Concave portions are provided so as to face the cavities and face each other, and a refrigerant path is disposed in each of the concave portions,
An annular groove is provided so as to surround the recess, and an IH coil is disposed in each of the annular grooves. 前記環状溝が波形又は上下若しくは下方に突き抜けた直線状であることを特徴とする請求項５に記載の射出成形装置。 6. The injection molding apparatus according to claim 5 , wherein the annular groove has a wave shape or a straight shape penetrating vertically or downward. 樹脂の射出前に前記ＩＨコイルによってキャビティが昇温され、射出充填後に前記冷媒路の冷媒によってキャビティが冷却される構成であることを特徴とする請求項５又は６に記載の射出成形装置。 The injection molding apparatus according to claim 5 or 6 , wherein the cavity is heated by the IH coil before resin injection, and the cavity is cooled by the refrigerant in the refrigerant path after injection filling. 射出前のキャビティが樹脂成形温度の６０〜９０％に昇温される構成であることを特徴とする請求項７に記載の射出成形装置。 The injection molding apparatus according to claim 7 , wherein the cavity before injection is configured to be heated to 60 to 90% of a resin molding temperature. 樹脂の射出前に前記冷媒路の冷媒によってキャビティが冷却され、射出充填後に前記ＩＨコイルによってキャビティが加熱制御される構成であることを特徴とする請求項５又は６に記載の射出成形装置。 The injection molding apparatus according to claim 5 or 6 , wherein the cavity is cooled by the refrigerant in the refrigerant path before injection of the resin, and the cavity is heated and controlled by the IH coil after injection filling.
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