JP7080695B2 - Injection molding machine - Google Patents

Injection molding machine Download PDF

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Publication number
JP7080695B2
JP7080695B2 JP2018064098A JP2018064098A JP7080695B2 JP 7080695 B2 JP7080695 B2 JP 7080695B2 JP 2018064098 A JP2018064098 A JP 2018064098A JP 2018064098 A JP2018064098 A JP 2018064098A JP 7080695 B2 JP7080695 B2 JP 7080695B2
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side portion
heat flow
mold
back side
heat
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JP2019171732A (en
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知寛 森谷
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Sumitomo Heavy Industries Ltd
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Sumitomo Heavy Industries Ltd
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Priority to JP2018064098A priority Critical patent/JP7080695B2/en
Priority to TW107143378A priority patent/TWI680856B/en
Priority to KR1020180161677A priority patent/KR20190114722A/en
Priority to CN201811587532.4A priority patent/CN110315722B/en
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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
    • B29C45/64—Mould opening, closing or clamping devices
    • 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
    • B29C45/1742—Mounting of moulds; Mould supports
    • B29C45/1744—Mould support platens
    • 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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature

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  • 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

本開示は、射出成形機に関する。 The present disclosure relates to an injection molding machine.

射出成形機において、プラテン本体を挟んで左右両側に一対の支持部を設けるセンター支持構造が提案されている（例えば特許文献１）。このセンター支持構造では、プラテン本体の下面を支持する場合と異なり、プラテン本体の温度分布が上下対称となる。これにより、プラテン本体は、上下対称に熱変形し、フレームに対して垂直に保たれる。その結果、可動プラテンに取り付けられる可動金型と、固定プラテンに取り付けられる固定金型とが平行に保たれ、型締力を偏りにくくできる。 In an injection molding machine, a center support structure has been proposed in which a pair of support portions are provided on both the left and right sides of a platen body (for example, Patent Document 1). In this center support structure, the temperature distribution of the platen body is vertically symmetrical, unlike the case where the lower surface of the platen body is supported. As a result, the platen body is thermally deformed vertically symmetrically and is kept perpendicular to the frame. As a result, the movable mold attached to the movable platen and the fixed mold attached to the fixed platen are kept in parallel, and the mold clamping force can be less likely to be biased.

特許第５９６８７６９号公報Japanese Patent No. 59668769

特許文献１に記載されるセンター支持構造では、金型側の熱流上流側と、その反対側の熱流下流側との間で支持部の温度差がつきやすかった。特に射出成形機の機械サイズを小さく設計すると、質量が下がるため、熱源に近い金型側は温度上昇が大きくなり、温度勾配が大きくなる。その結果、支持部の熱流上流側と熱流下流側の温度差がさらにつきやすくなる。支持部の温度差が大きくなると、支持部の熱変形によるたわみが生じる場合がある。 In the center support structure described in Patent Document 1, the temperature difference of the support portion is likely to occur between the heat flow upstream side on the mold side and the heat flow downstream side on the opposite side. In particular, if the machine size of the injection molding machine is designed to be small, the mass will be reduced, so that the temperature rise will be large on the mold side near the heat source, and the temperature gradient will be large. As a result, the temperature difference between the heat flow upstream side and the heat flow downstream side of the support portion becomes more likely to occur. When the temperature difference of the support portion becomes large, the support portion may be bent due to thermal deformation.

本開示は、プラテンの支持部の熱変形によるたわみ発生を抑制できる射出成形機を提供することを目的とする。 It is an object of the present disclosure to provide an injection molding machine capable of suppressing the occurrence of bending due to thermal deformation of a platen support portion.

本発明の実施形態の一観点に係る射出成形機は、金型が取り付けられる金型取付面が設けられるプラテンを具備し、前記プラテンは、前記金型取付面と直交する一対の側面からそれぞれ外側に延在して設けられ、前記プラテンを支持する一対の支持部を備え、前記支持部が、前記金型が設置される側の熱流上流側と、その反対側の熱流下流側との温度差を低減させる調整部を有し、前記調整部は、水平方向においての前記熱流上流側と前記熱流下流側の温度差を低減させる。

The injection molding machine according to one aspect of the embodiment of the present invention includes a platen provided with a mold mounting surface on which a mold is mounted, and the platen is outside from a pair of side surfaces orthogonal to the mold mounting surface. A pair of support portions extending to the platen to support the platen are provided, and the support portions are the temperature difference between the heat flow upstream side on the side where the mold is installed and the heat flow downstream side on the opposite side. The adjusting unit has an adjusting unit for reducing the temperature difference between the upstream side of the heat flow and the downstream side of the heat flow in the horizontal direction .

本開示によれば、プラテンの支持部の熱変形によるたわみ発生を抑制できる射出成形機を提供することができる。 According to the present disclosure, it is possible to provide an injection molding machine capable of suppressing the occurrence of bending due to thermal deformation of a platen support portion.

本発明の一実施形態による射出成形機の型閉じ完了時の状態を示す図である。It is a figure which shows the state at the time of completion of mold closing of the injection molding machine by one Embodiment of this invention. 本発明の一実施形態による射出成形機の型開き完了時の状態を示す図である。It is a figure which shows the state at the time of completion of the mold opening of the injection molding machine by one Embodiment of this invention. 図１のIII－III線に沿った断面図であって、可動プラテンの断面図である。It is a cross-sectional view along the line III-III of FIG. 1, and is the cross-sectional view of a movable platen. 図１のIV－IV線に沿った断面図であって、固定プラテンの断面図である。It is a cross-sectional view along the IV-IV line of FIG. 1, and is the cross-sectional view of the fixed platen. 可動プラテンの脚部の近傍の斜視図である。It is a perspective view of the vicinity of a leg of a movable platen. 溝の上端の傾斜角度に応じた熱流上流側と熱流下流側との間の温度差を示す図である。It is a figure which shows the temperature difference between the heat flow upstream side and the heat flow downstream side according to the inclination angle of the upper end of a groove. 傾斜角度の定義を示す模式図である。It is a schematic diagram which shows the definition of an inclination angle. 実施形態の変形例を示す模式図である。It is a schematic diagram which shows the modification of embodiment.

以下、添付図面を参照しながら実施形態について説明する。説明の理解を容易にするため、各図面において同一の構成要素に対しては可能な限り同一の符号を付して、重複する説明は省略する。 Hereinafter, embodiments will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same components are designated by the same reference numerals as possible in the drawings, and duplicate description is omitted.

まず図１～図４を参照して、本実施形態に係る射出成形機１０の全体の概略構成について説明する。図１は、本発明の一実施形態による射出成形機１０の型閉じ完了時の状態を示す図である。図２は、本発明の一実施形態による射出成形機１０の型開き完了時の状態を示す図である。図３は、図１のIII－III線に沿った断面図であって、可動プラテン１３の断面図である。図４は、図１のIV－IV線に沿った断面図であって、固定プラテン１２の断面図である。 First, with reference to FIGS. 1 to 4, the overall schematic configuration of the injection molding machine 10 according to the present embodiment will be described. FIG. 1 is a diagram showing a state when the mold closing of the injection molding machine 10 according to the embodiment of the present invention is completed. FIG. 2 is a diagram showing a state at the time of completion of mold opening of the injection molding machine 10 according to the embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1, and is a cross-sectional view of the movable platen 13. FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 1 and is a cross-sectional view of the fixed platen 12.

射出成形機１０は、図１および図２に示すように、フレーム１１と、フレーム１１に固定される固定プラテン１２と、固定プラテン１２と間隔をおいて配設されたリヤプラテン１５とを備える。固定プラテン１２とリヤプラテン１５とは、複数本（例えば４本）のタイバー１６で連結されている。タイバー１６の軸方向は、前後方向となっている。型締め時のタイバー１６の伸びを許容するため、リヤプラテン１５はフレーム１１に対して進退可能に載置されている。 As shown in FIGS. 1 and 2, the injection molding machine 10 includes a frame 11, a fixed platen 12 fixed to the frame 11, and a rear platen 15 arranged at a distance from the fixed platen 12. The fixed platen 12 and the rear platen 15 are connected by a plurality of (for example, four) tie bars 16. The axial direction of the tie bar 16 is the front-back direction. In order to allow the tie bar 16 to stretch during mold clamping, the rear platen 15 is mounted so as to be able to move forward and backward with respect to the frame 11.

射出成形機１０は、固定プラテン１２とリヤプラテン１５との間に配設される可動プラテン１３をさらに備える。可動プラテン１３は、図３などに示すように、左右一対のスライダ１４Ｌ、１４Ｒに固定されており、スライダ１４Ｌ、１４Ｒはフレーム１１に敷設されるガイド１７Ｌ、１７Ｒに沿って前後方向に移動自在である。これにより、可動プラテン１３は、固定プラテン１２に対して接離自在となっている。可動プラテン１３は、タイバー１６に対応する位置に切り欠きを有する。 The injection molding machine 10 further includes a movable platen 13 disposed between the fixed platen 12 and the rear platen 15. As shown in FIG. 3, the movable platen 13 is fixed to a pair of left and right sliders 14L and 14R, and the sliders 14L and 14R are movable in the front-rear direction along the guides 17L and 17R laid on the frame 11. be. As a result, the movable platen 13 can be brought into contact with and detached from the fixed platen 12. The movable platen 13 has a notch at a position corresponding to the tie bar 16.

尚、本実施形態の可動プラテン１３は、各タイバー１６に対応する位置に切り欠きを有するが、切り欠きの代わりに、貫通孔を有してもよい。 The movable platen 13 of the present embodiment has a notch at a position corresponding to each tie bar 16, but may have a through hole instead of the notch.

可動プラテン１３における固定プラテン１２との対向面に可動金型３３が、固定プラテン１２における可動プラテン１３との対向面に固定金型３２が取り付けられる。固定金型３２と可動金型３３とで金型装置３０が構成される。可動プラテン１３が前進すると、可動金型３３と固定金型３２とが接触し、型閉じが行われる。また、可動プラテン１３が後退すると、可動金型３３と固定金型３２とが離れ、型開きが行われる。 The movable mold 33 is attached to the surface of the movable platen 13 facing the fixed platen 12, and the fixed mold 32 is attached to the surface of the fixed platen 12 facing the movable platen 13. The mold device 30 is composed of the fixed mold 32 and the movable mold 33. When the movable platen 13 advances, the movable mold 33 and the fixed mold 32 come into contact with each other, and the mold is closed. Further, when the movable platen 13 is retracted, the movable mold 33 and the fixed mold 32 are separated from each other, and the mold is opened.

射出成形機１０は、可動プラテン１３とリヤプラテン１５との間に配設されるトグル機構２０と、トグル機構２０を作動させる型締用モータ２６とをさらに備える。型締用モータ２６は、回転運動を直線運動に変換する運動変換部としてのボールねじ機構を備え、駆動軸２５を進退させることで、トグル機構２０を作動させる。 The injection molding machine 10 further includes a toggle mechanism 20 disposed between the movable platen 13 and the rear platen 15, and a mold clamping motor 26 for operating the toggle mechanism 20. The mold clamping motor 26 includes a ball screw mechanism as a motion conversion unit that converts rotary motion into linear motion, and moves the drive shaft 25 forward and backward to operate the toggle mechanism 20.

トグル機構２０は、例えば、型開閉方向と平行な方向に進退自在なクロスヘッド２４、クロスヘッド２４に揺動自在に取り付けられた第２トグルレバー２３、リヤプラテン１５に揺動自在に取り付けられた第１トグルレバー２１、および可動プラテン１３に揺動自在に取り付けられたトグルアーム２２を有する。第１トグルレバー２１と第２トグルレバー２３とが、また、第１トグルレバー２１とトグルアーム２２とが、それぞれ、ピン結合される。このトグル機構２０は、いわゆる、内巻５節点ダブルトグル機構である。 The toggle mechanism 20 is, for example, a crosshead 24 that can move forward and backward in a direction parallel to the mold opening / closing direction, a second toggle lever 23 that is swingably attached to the crosshead 24, and a second toggle mechanism that is swingably attached to the rear platen 15. 1 It has a toggle lever 21 and a toggle arm 22 swingably attached to a movable platen 13. The first toggle lever 21 and the second toggle lever 23 are pin-coupled, and the first toggle lever 21 and the toggle arm 22 are pin-coupled, respectively. This toggle mechanism 20 is a so-called inner winding 5-node double toggle mechanism.

固定プラテン１２、可動プラテン１３、リヤプラテン１５、トグル機構２０、型締用モータ２６等によって型締装置が構成される。 The mold clamping device is composed of a fixed platen 12, a movable platen 13, a rear platen 15, a toggle mechanism 20, a mold clamping motor 26, and the like.

次に、上記構成の射出成形機１０の動作を図１および図２を参照して説明する。 Next, the operation of the injection molding machine 10 having the above configuration will be described with reference to FIGS. 1 and 2.

型開き完了の状態（図２の状態）で、型締用モータ２６を正方向に駆動し、被駆動部材としてのクロスヘッド２４を前進させることによって、トグル機構２０を作動させる。そうすると、可動プラテン１３が前進させられ、図１に示すように可動金型３３と固定金型３２とが接触し、型閉じが完了する。 When the mold opening is completed (the state of FIG. 2), the mold clamping motor 26 is driven in the positive direction, and the crosshead 24 as the driven member is advanced to operate the toggle mechanism 20. Then, the movable platen 13 is advanced, and as shown in FIG. 1, the movable mold 33 and the fixed mold 32 come into contact with each other, and the mold closing is completed.

続いて、型締用モータ２６をさらに正方向に駆動すると、トグル機構２０は、型締用モータ２６による推進力にトグル倍率を乗じた型締力を発生させる。その型締力によって型締めが行われる。そして、型締め状態の固定金型３２と可動金型３３との間に図示されないキャビティ空間が形成される。射出シリンダがキャビティ空間に溶融樹脂を充填し、充填された溶融樹脂が固化されて成形品となる。 Subsequently, when the mold clamping motor 26 is further driven in the positive direction, the toggle mechanism 20 generates a mold clamping force obtained by multiplying the propulsive force of the mold clamping motor 26 by the toggle magnification. Molding is performed by the mold clamping force. Then, a cavity space (not shown) is formed between the fixed mold 32 in the mold-clamped state and the movable mold 33. The injection cylinder fills the cavity space with the molten resin, and the filled molten resin is solidified to form a molded product.

続いて、型締用モータ２６を逆方向に駆動し、クロスヘッド２４を後退させ、トグル機構２０を作動させると、可動プラテン１３が後退させられ、型開きが行われる。その後、エジェクタ装置が可動金型３３から成形品を突き出す。 Subsequently, when the mold clamping motor 26 is driven in the opposite direction, the crosshead 24 is retracted, and the toggle mechanism 20 is operated, the movable platen 13 is retracted and the mold is opened. After that, the ejector device projects the molded product from the movable mold 33.

尚、本実施形態の型締装置は、トグル機構２０を使用して型締力を発生させるが、トグル機構２０を使用することなく、型締用モータ２６によって発生した推進力を直接型締力として可動プラテン１３に伝達してもよい。また、型締用シリンダによって発生した推進力を直接型締力として可動プラテン１３に伝達してもよい。また、リニアモータによって型開閉を行い、電磁石によって型締めを行ってもよく、型締装置の方式に制限はない。 The mold clamping device of the present embodiment uses the toggle mechanism 20 to generate the mold clamping force, but without using the toggle mechanism 20, the propulsive force generated by the mold clamping motor 26 is directly used as the mold clamping force. May be transmitted to the movable platen 13. Further, the propulsive force generated by the mold clamping cylinder may be directly transmitted to the movable platen 13 as the mold clamping force. Further, the mold may be opened and closed by a linear motor, and the mold may be clamped by an electromagnet, and there is no limitation on the method of the mold clamping device.

次に、図１および図３を参照して、可動プラテン１３の構成について説明する。 Next, the configuration of the movable platen 13 will be described with reference to FIGS. 1 and 3.

可動プラテン１３は、鋳鉄などの金属材料で形成される。可動プラテン１３は左右一対のスライダ１４Ｌ、１４Ｒに固定され、フレーム１１はスライダ１４Ｌ、１４Ｒやガイド１７Ｌ、１７Ｒなどを介して可動プラテン１３を支える。 The movable platen 13 is made of a metal material such as cast iron. The movable platen 13 is fixed to a pair of left and right sliders 14L and 14R, and the frame 11 supports the movable platen 13 via the sliders 14L and 14R and the guides 17L and 17R.

可動プラテン１３は、表側部４１と、裏側部４２と、中間部４３と、支持部４４Ｌ、４４Ｒとを含む。表側部４１、裏側部４２、中間部４３、および支持部４４Ｌ、４４Ｒは、一体に形成されてもよいし、別に形成されボルトなどで固定されてもよい。固定方法として、溶接が用いられてもよい。 The movable platen 13 includes a front side portion 41, a back side portion 42, an intermediate portion 43, and support portions 44L and 44R. The front side portion 41, the back side portion 42, the intermediate portion 43, and the support portions 44L and 44R may be integrally formed or may be separately formed and fixed by bolts or the like. Welding may be used as the fixing method.

表側部４１は、可動金型３３を取り付ける金型取付面４１Ａを有する。可動金型３３の中心線と、表側部４１の金型取付面の中心とが一致するように、可動金型３３が表側部４１に取り付けられてよい。 The front side portion 41 has a mold mounting surface 41A for mounting the movable mold 33. The movable mold 33 may be attached to the front side portion 41 so that the center line of the movable mold 33 and the center of the mold mounting surface of the front side portion 41 coincide with each other.

裏側部４２は、表側部４１における金型取付面４１Ａとは反対側の面と間隔をおいて配設される。裏側部４２における中間部４３とは反対側の面（後端面）には、トグル機構２０を取り付けるトグル取付部４５が設けられている。トグル取付部４５は、例えば、上下一対設けられ、それぞれ、トグルアーム２２を揺動自在に支持する。 The back side portion 42 is arranged at a distance from the surface of the front side portion 41 opposite to the mold mounting surface 41A. A toggle mounting portion 45 for mounting the toggle mechanism 20 is provided on the surface (rear end surface) of the back side portion 42 opposite to the intermediate portion 43. A pair of upper and lower toggle mounting portions 45 are provided, for example, and each of them swingably supports the toggle arm 22.

中間部４３は、表側部４１と裏側部４２とを接続する。中間部４３は、エジェクタ装置を配置するための空間の一部を形成する穴４６を有する。エジェクタ装置を配置するための空間は、表側部４１、中間部４３および裏側部４２にわたって形成されるが、表側部４１では狭く、中間部４３および裏側部４２では広い。エジェクタ装置を配置するための空間は、前後に開放されており、表側部４１、裏側部４２、および中間部４３を同時に鋳造するとき、鋳型で形成可能である。なお、可動プラテン１３にエジェクタ装置を配置するための穴４６を設けない構成としてもよい。 The intermediate portion 43 connects the front side portion 41 and the back side portion 42. The intermediate portion 43 has a hole 46 forming a part of the space for arranging the ejector device. The space for arranging the ejector device is formed over the front side portion 41, the intermediate portion 43, and the back side portion 42, but is narrow in the front side portion 41 and wide in the intermediate portion 43 and the back side portion 42. The space for arranging the ejector device is open to the front and back, and can be formed by a mold when the front side portion 41, the back side portion 42, and the intermediate portion 43 are cast at the same time. The movable platen 13 may not be provided with a hole 46 for arranging the ejector device.

中間部４３は、例えば筒状であり、表側部４１と裏側部４２とを連結する。中間部４３は、表側部４１と裏側部４２とを連結できる構造であればどのような構造でもよい。また、可動プラテン１３は、中間部４３が無い構成でもよい。 The intermediate portion 43 has, for example, a cylindrical shape, and connects the front side portion 41 and the back side portion 42. The intermediate portion 43 may have any structure as long as it can connect the front side portion 41 and the back side portion 42. Further, the movable platen 13 may be configured without the intermediate portion 43.

支持部４４Ｌ、４４Ｒは、裏側部４２を介して中間部４３および表側部４１を支持する。支持部４４Ｌ、４４Ｒは、裏側部４２を挟んで左右両側に設けられる。支持部４４Ｌ、４４Ｒは、裏側部４２の一対の側面４２Ｌ，４２Ｒからそれぞれ外側に延在して設けられ、各側面４２Ｌ，４２Ｒの上下方向中央部を支持する。つまり、支持部４４Ｌ、４４Ｒは、表側部４１の金型取付面４１Ａの中心位置と、フレーム１１に対して略同じ距離の位置で、裏側部４２の側面４２Ｌ，４２Ｒを支持する、所謂センター支持構造である。一対の側面４２Ｌ，４２Ｒは、それぞれ金型取付面４１Ａと直交する方向に設けられる。 The support portions 44L and 44R support the intermediate portion 43 and the front side portion 41 via the back side portion 42. The support portions 44L and 44R are provided on both the left and right sides of the back side portion 42. The support portions 44L and 44R are provided extending outward from the pair of side surfaces 42L and 42R of the back side portion 42, respectively, and support the vertical central portions of the side surface portions 42L and 42R. That is, the support portions 44L and 44R support the side surface 42L and 42R of the back side portion 42 at a position substantially the same distance from the center position of the mold mounting surface 41A of the front side portion 41 and the frame 11, so-called center support. It is a structure. The pair of side surfaces 42L and 42R are provided in the directions orthogonal to the mold mounting surface 41A, respectively.

支持部４４Ｌ、４４Ｒは、裏側部４２の側面４２Ｌ、４２Ｒの上下方向中央部を支持することで、裏側部４２、中間部４３および表側部４１をフレーム１１から離間させる。支持部４４Ｌ、４４Ｒは、一端部で裏側部４２の側面と接続し、他端部でスライダ１４Ｌ、１４Ｒと接続する。 The support portions 44L and 44R support the side surface 42L and 42R of the back side portion 42 in the vertical direction to separate the back side portion 42, the intermediate portion 43 and the front side portion 41 from the frame 11. The support portions 44L and 44R are connected to the side surface of the back side portion 42 at one end and connected to the sliders 14L and 14R at the other end.

ところで、金型装置３０の温度は温調機によって所定の温度に調節される。可動金型３３の熱は、表側部４１、中間部４３、裏側部４２、および支持部４４Ｌ、４４Ｒなどを介して、フレーム１１に移動する。 By the way, the temperature of the mold device 30 is adjusted to a predetermined temperature by a temperature controller. The heat of the movable mold 33 is transferred to the frame 11 via the front side portion 41, the intermediate portion 43, the back side portion 42, the support portions 44L, 44R, and the like.

本実施形態では、支持部４４Ｌ、４４Ｒが裏側部４２の側面の上下方向中央部を支持するので、裏側部４２の下面を支持する場合と異なり、裏側部４２の温度分布が上下対称になる。よって、裏側部４２は、上下対称に熱変形し、フレーム１１に対して垂直に保たれる。その結果、可動金型３３と固定金型３２とが平行に保たれ、型締力が偏りにくい。 In the present embodiment, since the support portions 44L and 44R support the central portion in the vertical direction of the side surface of the back side portion 42, the temperature distribution of the back side portion 42 is vertically symmetrical, unlike the case where the lower surface of the back side portion 42 is supported. Therefore, the back side portion 42 is thermally deformed vertically symmetrically and is kept perpendicular to the frame 11. As a result, the movable mold 33 and the fixed mold 32 are kept in parallel, and the mold clamping force is less likely to be biased.

また、本実施形態では、支持部４４Ｌ、４４Ｒが裏側部４２の下面を拘束しないので、裏側部４２が上下両方向に熱変形することができる。よって、フレーム１１に対して裏側部４２の中心線が上下にずれにくく、可動金型３３の中心線が固定金型３２の中心線に対して上下にずれにくい。 Further, in the present embodiment, since the support portions 44L and 44R do not restrain the lower surface of the back side portion 42, the back side portion 42 can be thermally deformed in both the upper and lower directions. Therefore, the center line of the back side portion 42 is less likely to shift up and down with respect to the frame 11, and the center line of the movable mold 33 is less likely to shift up and down with respect to the center line of the fixed mold 32.

尚、本実施形態の支持部４４Ｌ、４４Ｒは、裏側部４２を挟んで左右両側に設けられ、裏側部４２の側面４２Ｌ、４２Ｒの上下方向中央部を支持するが、裏側部４２における中間部４３と反対側の面の上下方向中央部を支持してもよい。 The support portions 44L and 44R of the present embodiment are provided on both the left and right sides of the back side portion 42 to support the vertical center portions of the side surface 42L and 42R of the back side portion 42, but the intermediate portion 43 in the back side portion 42. The central portion in the vertical direction of the surface opposite to the above surface may be supported.

中間部４３は、表側部４１から裏側部４２への熱の移動を抑制する。つまり、中間部４３は、表側部４１よりも型開閉方向に熱を伝えにくい構造となっている。射出成形時に、表側部４１の熱が、中間部４３を介して裏側部４２や支持部４４Ｌ、４４Ｒに移動しにくく、支持部４４Ｌ、４４Ｒの温度勾配が緩やかになる。よって、温度勾配による支持部４４Ｌ、４４Ｒの撓みが小さく、フレーム１１に対して表側部４１の金型取付面が垂直に保たれる。よって、可動金型３３の傾きを抑制することができる。 The intermediate portion 43 suppresses the transfer of heat from the front side portion 41 to the back side portion 42. That is, the intermediate portion 43 has a structure in which it is more difficult to transfer heat in the mold opening / closing direction than the front side portion 41. At the time of injection molding, the heat of the front side portion 41 is difficult to transfer to the back side portion 42 and the support portions 44L and 44R via the intermediate portion 43, and the temperature gradient of the support portions 44L and 44R becomes gentle. Therefore, the bending of the support portions 44L and 44R due to the temperature gradient is small, and the mold mounting surface of the front side portion 41 is kept perpendicular to the frame 11. Therefore, the inclination of the movable mold 33 can be suppressed.

例えば、中間部４３は、断熱用の穴４７を有することで、表側部４１から裏側部４２への熱の移動を抑制する。断熱用の穴４７は、表側部４１の材料よりも熱伝導率の低い材料で満たされていればよく、例えば空気などの気体で満たされていてよい。気体は、液体や固体に比べて、低い熱伝導率を有し、熱を伝えにくい。 For example, the intermediate portion 43 has a hole 47 for heat insulation, thereby suppressing heat transfer from the front side portion 41 to the back side portion 42. The heat insulating hole 47 may be filled with a material having a lower thermal conductivity than the material of the front side portion 41, and may be filled with a gas such as air. A gas has a lower thermal conductivity than a liquid or a solid, and is difficult to transfer heat.

断熱用の穴４７は、中間部４３の露出面から、型開閉方向に対して垂直な方向（例えば、左右方向）に延びていてよい。表側部４１、裏側部４２、および中間部４３を同時に鋳造するとき、鋳型で断熱用の穴４７を形成することができ、鋳造後に断熱用の穴４７を形成するための加工が不要になる。支持部４４Ｌ、４４Ｒは、表側部４１、裏側部４２、および中間部４３と同時に鋳造してもよいし、別に製造してボルトなどで固定してもよい。 The heat insulating hole 47 may extend from the exposed surface of the intermediate portion 43 in a direction perpendicular to the mold opening / closing direction (for example, in the left-right direction). When the front side portion 41, the back side portion 42, and the intermediate portion 43 are cast at the same time, the heat insulating hole 47 can be formed by the mold, and the processing for forming the heat insulating hole 47 after casting becomes unnecessary. The support portions 44L and 44R may be cast at the same time as the front side portion 41, the back side portion 42, and the intermediate portion 43, or may be manufactured separately and fixed with bolts or the like.

断熱用の穴４７が形成されることで、中間部４３は、表側部４１だけでなく、裏側部４２よりも型開閉方向に熱を伝えにくい構造となっている。これにより、表側部４１から裏側部４２への熱の移動がさらに抑制できる。 By forming the heat insulating hole 47, the intermediate portion 43 has a structure in which it is more difficult to transfer heat in the mold opening / closing direction than not only the front side portion 41 but also the back side portion 42. As a result, the transfer of heat from the front side portion 41 to the back side portion 42 can be further suppressed.

尚、本実施形態の断熱用の穴４７は、中間部４３を貫通しているが、中間部４３を貫通しなくてもよい。また、断熱用の穴４７は、上下方向に延びていてもよい。 Although the heat insulating hole 47 of the present embodiment penetrates the intermediate portion 43, it does not have to penetrate the intermediate portion 43. Further, the heat insulating hole 47 may extend in the vertical direction.

また、中間部４３は、中間部４３の外側に、表側部４１と裏側部４２とを隔てる断熱用の溝４８を形成してよい。断熱用の溝４８は、表側部４１から裏側部４２への熱の移動を抑制する。断熱用の溝４８は、断熱用の穴４７と同様に、表側部４１の材料よりも熱伝導率の低い材料で満たされていればよく、例えば空気などの気体で満たされていてよい。尚、中間部４３が中間部４３の外側に断熱用の溝４８を形成する場合、断熱用の穴４７がなくてもよい。 Further, the intermediate portion 43 may form a groove 48 for heat insulation that separates the front side portion 41 and the back side portion 42 on the outside of the intermediate portion 43. The heat insulating groove 48 suppresses the transfer of heat from the front side portion 41 to the back side portion 42. Like the heat insulating hole 47, the heat insulating groove 48 may be filled with a material having a lower thermal conductivity than the material of the front side portion 41, and may be filled with a gas such as air. When the intermediate portion 43 forms the groove 48 for heat insulation on the outside of the intermediate portion 43, the hole 47 for heat insulation may not be provided.

中間部４３が表側部４１と別に形成され、ボルトなどで固定される場合、中間部４３は、図示されない気泡などの空隙部を有することで、表側部４１から裏側部４２への熱の移動を抑制してもよい。気泡を含む中間部４３は、例えば発泡金属などの発泡材料で形成される。中間部４３の気泡は、外気に対して開放されていてもよいし、外気に対して閉じていてもよい。また、中間部４３に含まれる複数の気泡は、互いに独立していてもよいし、互いに連通していてもよい。尚、中間部４３が気泡を含む場合、断熱用の穴４７や断熱用の溝４８などがなくてもよい。 When the intermediate portion 43 is formed separately from the front side portion 41 and is fixed by a bolt or the like, the intermediate portion 43 has a gap portion such as an air bubble (not shown) to transfer heat from the front side portion 41 to the back side portion 42. It may be suppressed. The intermediate portion 43 containing bubbles is formed of a foaming material such as foamed metal. The bubbles in the intermediate portion 43 may be open to the outside air or may be closed to the outside air. Further, the plurality of bubbles contained in the intermediate portion 43 may be independent of each other or may communicate with each other. When the intermediate portion 43 contains air bubbles, the heat insulating hole 47 and the heat insulating groove 48 may not be provided.

また、中間部４３が表側部４１と別に形成され、ボルトなどで固定される場合、中間部４３は、表側部４１の材料よりも低い熱伝導率の材料で形成されることで、表側部４１から裏側部４２への熱の移動を抑制してもよい。尚、中間部４３が表側部４１の材料よりも低い熱伝導率の材料で形成される場合、断熱用の穴４７や断熱用の溝４８、気泡などがなくてもよい。 Further, when the intermediate portion 43 is formed separately from the front side portion 41 and is fixed by a bolt or the like, the intermediate portion 43 is formed of a material having a lower thermal conductivity than the material of the front side portion 41, so that the front side portion 41 is formed. The heat transfer from the back side portion 42 to the back side portion 42 may be suppressed. When the intermediate portion 43 is made of a material having a thermal conductivity lower than that of the material of the front side portion 41, there may be no holes 47 for heat insulation, grooves 48 for heat insulation, air bubbles, or the like.

裏側部４２は、表側部４１よりも型開閉方向に熱を伝えやすい構造でもよいが、支持部４４Ｌ、４４Ｒの温度勾配をより緩やかにするため、中間部４３と同様に、表側部４１よりも型開閉方向に熱を伝えにくい構造であってよい。 The back side portion 42 may have a structure that makes it easier to transfer heat in the mold opening / closing direction than the front side portion 41, but in order to make the temperature gradient of the support portions 44L and 44R more gentle, the back side portion 42 is more than the front side portion 41 like the intermediate portion 43. The structure may be such that it is difficult to transfer heat in the mold opening / closing direction.

次に、図１および図４を参照して、固定プラテン１２の構成について説明する。 Next, the configuration of the fixed platen 12 will be described with reference to FIGS. 1 and 4.

固定プラテン１２は、鋳鉄などの金属材料で形成される。固定プラテン１２はフレーム１１に固定され、フレーム１１は固定プラテン１２を支える。 The fixed platen 12 is made of a metal material such as cast iron. The fixed platen 12 is fixed to the frame 11, and the frame 11 supports the fixed platen 12.

固定プラテン１２は、表側部５１と、裏側部５２と、中間部５３と、支持部５４Ｌ、５４Ｒとを含む。表側部５１、裏側部５２、中間部５３、および支持部５４Ｌ、５４Ｒは、一体に形成されてもよいし、別に形成されボルトなどで固定されてもよい。固定方法として、溶接が用いられてもよい。 The fixed platen 12 includes a front side portion 51, a back side portion 52, an intermediate portion 53, and support portions 54L and 54R. The front side portion 51, the back side portion 52, the intermediate portion 53, and the support portions 54L and 54R may be integrally formed or may be separately formed and fixed by bolts or the like. Welding may be used as the fixing method.

表側部５１は、固定金型３２を取り付ける金型取付面を有する。固定金型３２の中心線と、表側部５１の金型取付面の中心とが一致するように、固定金型３２が表側部５１に取り付けられてよい。 The front side portion 51 has a mold mounting surface for mounting the fixed mold 32. The fixed mold 32 may be attached to the front side portion 51 so that the center line of the fixed mold 32 and the center of the mold mounting surface of the front side portion 51 coincide with each other.

裏側部５２は、表側部５１における金型取付面とは反対側の面と間隔をおいて配設される。裏側部５２には、タイバー１６の前端部が固定されている。なお、タイバー１６の前端部は、裏側部５２ではなく、中間部５３または表側部５１に固定されてもよい。 The back side portion 52 is arranged at a distance from the surface of the front side portion 51 opposite to the mold mounting surface. The front end portion of the tie bar 16 is fixed to the back side portion 52. The front end portion of the tie bar 16 may be fixed to the intermediate portion 53 or the front side portion 51 instead of the back side portion 52.

中間部５３は、表側部５１と裏側部５２とを接続する。中間部５３は、例えば筒状であり、表側部５１と裏側部５２とを連結する。中間部５３は、表側部５１と裏側部５２とを連結できる構造であればどのような構造でもよい。また、固定プラテン１２は、中間部５３が無い構成でもよい。 The intermediate portion 53 connects the front side portion 51 and the back side portion 52. The intermediate portion 53 has, for example, a cylindrical shape, and connects the front side portion 51 and the back side portion 52. The intermediate portion 53 may have any structure as long as the front side portion 51 and the back side portion 52 can be connected to each other. Further, the fixed platen 12 may be configured without the intermediate portion 53.

支持部５４Ｌ、５４Ｒは、裏側部５２を介して中間部５３および表側部５１を支持する。支持部５４Ｌ、５４Ｒは、裏側部５２を挟んで左右両側に設けられる。支持部５４Ｌ、５４Ｒは、裏側部５２の側面の上下方向中央部を支持する。つまり、支持部５４Ｌ、５４Ｒは、表側部５１の金型取付面の中心位置と、フレーム１１に対して略同じ距離の位置で、裏側部５２の側面を支持する。 The support portions 54L and 54R support the intermediate portion 53 and the front side portion 51 via the back side portion 52. The support portions 54L and 54R are provided on both the left and right sides with the back side portion 52 interposed therebetween. The support portions 54L and 54R support the vertical central portion of the side surface of the back side portion 52. That is, the support portions 54L and 54R support the side surface of the back side portion 52 at a position substantially the same distance from the center position of the mold mounting surface of the front side portion 51 and the frame 11.

支持部５４Ｌ、５４Ｒは、裏側部５２の側面の上下方向中央部を支持することで、裏側部５２、中間部５３および表側部５１をフレーム１１から離間させる。支持部５４Ｌ、５４Ｒは、一端部で裏側部５２の側面と接続し、他端部でフレーム１１と接続する。 The support portions 54L and 54R support the vertical central portion of the side surface of the back side portion 52 to separate the back side portion 52, the intermediate portion 53, and the front side portion 51 from the frame 11. The support portions 54L and 54R are connected to the side surface of the back side portion 52 at one end and to the frame 11 at the other end.

ところで、金型装置３０の温度は温調機によって所定の温度に調節される。固定金型３２の熱は、表側部５１、中間部５３、裏側部５２、および支持部５４Ｌ、５４Ｒを介して、フレーム１１に移動する。 By the way, the temperature of the mold device 30 is adjusted to a predetermined temperature by a temperature controller. The heat of the fixed mold 32 is transferred to the frame 11 via the front side portion 51, the intermediate portion 53, the back side portion 52, and the support portions 54L and 54R.

本実施形態では、支持部５４Ｌ、５４Ｒが裏側部５２の側面の上下方向中央部を支持するので、裏側部５２の下面を支持する場合と異なり、裏側部５２の温度分布が上下対称になる。よって、裏側部５２は、上下対称に熱変形し、フレーム１１に対して垂直に保たれる。その結果、可動金型３３と固定金型３２とが平行に保たれ、型締力が偏りにくい。 In the present embodiment, since the support portions 54L and 54R support the central portion in the vertical direction of the side surface of the back side portion 52, the temperature distribution of the back side portion 52 is vertically symmetrical unlike the case where the lower surface of the back side portion 52 is supported. Therefore, the back side portion 52 is thermally deformed vertically symmetrically and is kept perpendicular to the frame 11. As a result, the movable mold 33 and the fixed mold 32 are kept in parallel, and the mold clamping force is less likely to be biased.

また、本実施形態では、支持部５４Ｌ、５４Ｒが裏側部５２の下面を拘束しないので、裏側部５２が上下両方向に熱変形することができる。よって、フレーム１１に対して裏側部５２の中心線が上下にずれにくく、可動金型３３の中心線が固定金型３２の中心線に対して上下にずれにくい。 Further, in the present embodiment, since the support portions 54L and 54R do not restrain the lower surface of the back side portion 52, the back side portion 52 can be thermally deformed in both the upper and lower directions. Therefore, the center line of the back side portion 52 is less likely to shift up and down with respect to the frame 11, and the center line of the movable mold 33 is less likely to shift up and down with respect to the center line of the fixed mold 32.

尚、本実施形態の支持部５４Ｌ、５４Ｒは、裏側部５２を挟んで左右両側に設けられ、裏側部５２の側面の上下方向中央部を支持するが、裏側部５２における中間部５３と反対側の面の上下方向中央部を支持してもよい。 The support portions 54L and 54R of the present embodiment are provided on both the left and right sides of the back side portion 52 to support the vertical center portion of the side surface of the back side portion 52, but are opposite to the intermediate portion 53 in the back side portion 52. The central portion of the surface in the vertical direction may be supported.

表側部５１、中間部５３および裏側部５２には、キャビティ空間に溶融樹脂を充填する射出シリンダを挿入するための空間５６が連続的に形成されてよい。この空間５６は、前後に開放されており、鋳型で形成可能である。 Spaces 56 for inserting an injection cylinder for filling the cavity space with the molten resin may be continuously formed in the front side portion 51, the intermediate portion 53, and the back side portion 52. This space 56 is open to the front and back and can be formed by a mold.

中間部５３は、表側部５１から裏側部５２への熱の移動を抑制する。つまり、中間部５３は、表側部５１よりも型開閉方向に熱を伝えにくい構造となっている。射出成形時に、表側部５１の熱が、中間部５３を介して裏側部５２や支持部５４Ｌ、５４Ｒに移動しにくく、支持部５４Ｌ、５４Ｒの温度勾配が緩やかになる。よって、温度勾配による支持部５４Ｌ、５４Ｒの撓みが小さく、フレーム１１に対して表側部５１の金型取付面が垂直に保たれる。よって、固定金型３２の傾きを抑制することができる。 The intermediate portion 53 suppresses the transfer of heat from the front side portion 51 to the back side portion 52. That is, the intermediate portion 53 has a structure in which it is more difficult to transfer heat in the mold opening / closing direction than the front side portion 51. At the time of injection molding, the heat of the front side portion 51 is difficult to transfer to the back side portion 52 and the support portions 54L and 54R via the intermediate portion 53, and the temperature gradient of the support portions 54L and 54R becomes gentle. Therefore, the bending of the support portions 54L and 54R due to the temperature gradient is small, and the mold mounting surface of the front side portion 51 is kept perpendicular to the frame 11. Therefore, the inclination of the fixed mold 32 can be suppressed.

例えば、中間部５３は、図３に示すように断熱用の穴５７を有することで、表側部５１から裏側部５２への熱の移動を抑制する。断熱用の穴５７は、表側部５１の材料よりも熱伝導率の低い材料で満たされていればよく、例えば空気などの気体で満たされていてよい。気体は、液体や固体に比べて、低い熱伝導率を有し、熱を伝えにくい。 For example, the intermediate portion 53 has a hole 57 for heat insulation as shown in FIG. 3, thereby suppressing heat transfer from the front side portion 51 to the back side portion 52. The heat insulating hole 57 may be filled with a material having a lower thermal conductivity than the material of the front side portion 51, and may be filled with a gas such as air. A gas has a lower thermal conductivity than a liquid or a solid, and is difficult to transfer heat.

断熱用の穴５７は、中間部５３の露出面から、型開閉方向に対して垂直な方向（例えば、左右方向）に延びていてよい。表側部５１、裏側部５２、および中間部５３を同時に鋳造するとき、鋳型で断熱用の穴５７を形成することができ、鋳造後に断熱用の穴５７を形成するための加工が不要になる。支持部５４Ｌ、５４Ｒは、表側部５１、裏側部５２、および中間部５３と同時に鋳造してもよいし、別に製造してボルトなどで固定してもよい。 The heat insulating hole 57 may extend from the exposed surface of the intermediate portion 53 in a direction perpendicular to the mold opening / closing direction (for example, in the left-right direction). When the front side portion 51, the back side portion 52, and the intermediate portion 53 are cast at the same time, the heat insulating hole 57 can be formed by the mold, and the processing for forming the heat insulating hole 57 after casting becomes unnecessary. The support portions 54L and 54R may be cast at the same time as the front side portion 51, the back side portion 52, and the intermediate portion 53, or may be manufactured separately and fixed with bolts or the like.

断熱用の穴５７が形成されることで、中間部５３は、表側部５１だけでなく、裏側部５２よりも型開閉方向に熱を伝えにくい構造となっている。これにより、表側部５１から裏側部５２への熱の移動がさらに抑制できる。 By forming the heat insulating hole 57, the intermediate portion 53 has a structure in which it is more difficult to transfer heat in the mold opening / closing direction than not only the front side portion 51 but also the back side portion 52. As a result, the transfer of heat from the front side portion 51 to the back side portion 52 can be further suppressed.

尚、本実施形態の断熱用の穴５７は、中間部５３を貫通しているが、中間部５３を貫通しなくてもよい。また、断熱用の穴５７は、上下方向に延びていてもよい。 Although the heat insulating hole 57 of the present embodiment penetrates the intermediate portion 53, it does not have to penetrate the intermediate portion 53. Further, the heat insulating hole 57 may extend in the vertical direction.

また、中間部５３は、中間部５３の外側に、表側部５１と裏側部５２とを隔てる断熱用の溝５８を形成してよい。断熱用の溝５８は、表側部５１から裏側部５２への熱の移動を抑制する。断熱用の溝５８は、断熱用の穴５７と同様に、表側部５１の材料よりも熱伝導率の低い材料で満たされていればよく、例えば空気などの気体で満たされていてよい。尚、中間部５３が中間部５３の外側に断熱用の溝５８を形成する場合、断熱用の穴５７がなくてもよい。 Further, the intermediate portion 53 may form a groove 58 for heat insulation that separates the front side portion 51 and the back side portion 52 on the outside of the intermediate portion 53. The heat insulating groove 58 suppresses the transfer of heat from the front side portion 51 to the back side portion 52. Like the heat insulating hole 57, the heat insulating groove 58 may be filled with a material having a lower thermal conductivity than the material of the front side portion 51, and may be filled with a gas such as air. When the intermediate portion 53 forms the groove 58 for heat insulation on the outside of the intermediate portion 53, the hole 57 for heat insulation may not be provided.

中間部５３が表側部５１と別に形成され、ボルトなどで固定される場合、中間部５３は、図示されない気泡などの空隙部を有することで、表側部５１から裏側部５２への熱の移動を抑制してもよい。気泡を含む中間部５３は、例えば発泡金属などの発泡材料で形成される。中間部５３の気泡は、外気に対して開放されていてもよいし、外気に対して閉じていてもよい。また、中間部５３に含まれる複数の気泡は、互いに独立していてもよいし、互いに連通していてもよい。尚、中間部５３が気泡を含む場合、断熱用の穴５７や断熱用の溝５８などがなくてもよい。 When the intermediate portion 53 is formed separately from the front side portion 51 and is fixed by a bolt or the like, the intermediate portion 53 has a gap portion such as an air bubble (not shown) to transfer heat from the front side portion 51 to the back side portion 52. It may be suppressed. The intermediate portion 53 containing bubbles is formed of a foam material such as foamed metal. The bubbles in the intermediate portion 53 may be open to the outside air or may be closed to the outside air. Further, the plurality of bubbles contained in the intermediate portion 53 may be independent of each other or may communicate with each other. When the intermediate portion 53 contains air bubbles, the heat insulating hole 57 and the heat insulating groove 58 may not be provided.

また、中間部５３が表側部５１と別に形成され、ボルトなどで固定される場合、中間部５３は、表側部５１の材料よりも低い熱伝導率の材料で形成されることで、表側部５１から裏側部５２への熱の移動を抑制してもよい。中間部５３は、例えば表側部５１の金属材料よりも低い熱伝導率の金属材料で形成される。尚、中間部５３が表側部５１の材料よりも低い熱伝導率の材料で形成される場合、断熱用の穴５７や断熱用の溝５８、気泡などがなくてもよい。 Further, when the intermediate portion 53 is formed separately from the front side portion 51 and is fixed by a bolt or the like, the intermediate portion 53 is formed of a material having a lower thermal conductivity than the material of the front side portion 51, so that the front side portion 51 is formed. The heat transfer from the back side portion 52 to the back side portion 52 may be suppressed. The intermediate portion 53 is formed of, for example, a metal material having a lower thermal conductivity than the metal material of the front side portion 51. When the intermediate portion 53 is made of a material having a thermal conductivity lower than that of the material of the front side portion 51, there may be no holes 57 for heat insulation, grooves 58 for heat insulation, air bubbles, or the like.

裏側部５２は、表側部５１よりも型開閉方向に熱を伝えやすい構造でもよいが、支持部５４Ｌ、５４Ｒの温度勾配をより緩やかにするため、中間部５３と同様に、表側部５１よりも型開閉方向に熱を伝えにくい構造であってよい。 The back side portion 52 may have a structure that is easier to transfer heat in the mold opening / closing direction than the front side portion 51, but in order to make the temperature gradient of the support portions 54L and 54R more gentle, the back side portion 52 is more than the front side portion 51 like the intermediate portion 53. The structure may be such that it is difficult to transfer heat in the mold opening / closing direction.

（可動プラテンの構造）
図５を参照して本実施形態に係る可動プラテン１３の構造の詳細について説明する。図５は、可動プラテン１３の支持部４４Ｌの近傍の斜視図である。 (Structure of movable platen)
The details of the structure of the movable platen 13 according to the present embodiment will be described with reference to FIG. FIG. 5 is a perspective view of the vicinity of the support portion 44L of the movable platen 13.

図５には、一対の支持部４４Ｌ、４４ＲのうちＹ正方向側の支持部４４Ｌの近傍を図示しているが、反対側の支持部４４Ｒの近傍も同様である。特に本実施形態では、支持部４４Ｌ、４４Ｒは、可動金型３３が設置される側の熱流上流側１４２と、その反対側の熱流下流側１４３との温度差を低減させる「調整部」を有する。成形サイクル中に可動金型３３で発生した熱は、可動プラテン１３の表側部４１、中間部４３、裏側部４２を経由して支持部４４Ｌ、４４ＲのＸ正方向側の部分に伝達する。支持部４４Ｌ、４４Ｒ内でこの熱流ＨはＸ方向に沿ってＸ負方向側に伝播する。熱流上流側１４２とは支持部４４Ｌ、４４ＲのＸ正方向側の部分であり、熱流下流側１４３とはＸ負方向側の部分である。 FIG. 5 shows the vicinity of the support portion 44L on the Y positive direction side of the pair of support portions 44L and 44R, but the same applies to the vicinity of the support portion 44R on the opposite side. In particular, in the present embodiment, the support portions 44L and 44R have an "adjustment portion" that reduces the temperature difference between the heat flow upstream side 142 on the side where the movable mold 33 is installed and the heat flow downstream side 143 on the opposite side. .. The heat generated in the movable mold 33 during the molding cycle is transferred to the X positive direction portions of the support portions 44L and 44R via the front side portion 41, the intermediate portion 43, and the back side portion 42 of the movable platen 13. This heat flow H propagates in the X negative direction along the X direction in the support portions 44L and 44R. The heat flow upstream side 142 is a portion of the support portions 44L and 44R on the X positive direction side, and the heat flow downstream side 143 is a portion on the X negative direction side.

本実施形態ではこの「調整部」とは、具体的には支持部４４Ｌ、４４Ｒの外側表面（上面）に設けられる溝１４１である。この溝１４１の上端１４１Ａは、熱流上流側１４２が熱流下流側１４３より可動プラテン１３の裏側部４２の側面４２Ｌ、４２Ｒから離れるように傾斜して形成されている。つまり、溝１４１の上端１４１Ａは、熱流上流側１４２から熱流下流側１４３へ進むほどＺ方向位置が上方に上がる方向に傾斜して形成される。この上端１４１Ａの傾斜角度αは、例えば３０～６０°程度であるのが好ましい。 In the present embodiment, the "adjusting portion" is specifically a groove 141 provided on the outer surface (upper surface) of the support portions 44L and 44R. The upper end 141A of the groove 141 is formed so as to be inclined so that the heat flow upstream side 142 is separated from the heat flow downstream side 143 and the side surfaces 42L and 42R of the back side portion 42 of the movable platen 13. That is, the upper end 141A of the groove 141 is formed so as to be inclined in a direction in which the Z direction position rises upward as the heat flow upstream side 142 advances to the heat flow downstream side 143. The inclination angle α of the upper end 141A is preferably, for example, about 30 to 60 °.

溝１４１の上端１４１Ａの形状については、例えば以下のような別表現でも表すことができる。溝１４１は、可動プラテン１３の裏側部４２の側面４２Ｌ，４２Ｒから熱流下流側１４３の上端１４１Ａまでの距離が、可動プラテン１３の裏側部４２の側面４２Ｌ，４２Ｒから熱流上流側１４２の上端１４１Ａまでの距離より短くなるよう形成される。または、溝１４１は、上端近傍部分のＸ方向の幅が、熱流下流側１４３の上端角部から熱流上流側１４２に広がるよう形成される。
The shape of the upper end 141A of the groove 141 can be expressed by another expression such as the following. In the groove 141, the distance from the side surfaces 42L, 42R of the back side portion 42 of the movable platen 13 to the upper end 141A of the heat flow downstream side 143 is from the side surface 42L, 42R of the back side portion 42 of the movable platen 13 to the upper end 141A of the heat flow upstream side 142. It is formed so as to be shorter than the distance of. Alternatively, the groove 141 is formed so that the width of the portion near the upper end in the X direction extends from the upper end corner portion of the heat flow downstream side 143 to the heat flow upstream side 142.

このように溝１４１を設けることにより、支持部４４Ｌ、４４Ｒのうち上端１４１Ａより上の部分では、熱流Ｈの進行方向に対して熱流上流側１４２の幅が広く、熱流下流側１４３に進むほど幅が狭くできる。これにより、熱流上流側１４２の熱流Ｈが熱流下流側１４３に進むにつれて集約されて、熱流束（単位時間当たりに単位面積を流れる熱エネルギ）が高くなる。これにより、可動金型３３側の熱流上流側１４２と、その反対側の熱流下流側１４３との間で支持部４４Ｌ、４４Ｒの温度差Δθを低減できる。支持部４４Ｌ、４４Ｒの熱流上流側１４２と熱流下流側１４３の温度差Δθが小さいと、支持部４４Ｌ、４４Ｒの熱変形も抑制できる。この結果、可動プラテン１３の支持部４４Ｌ、４４Ｒの熱変形によるたわみ発生を抑制できる。 By providing the groove 141 in this way, in the portion of the support portions 44L and 44R above the upper end 141A, the width of the heat flow upstream side 142 is wider with respect to the traveling direction of the heat flow H, and the width increases toward the heat flow downstream side 143. Can be narrowed. As a result, the heat flow H of the heat flow upstream side 142 is aggregated as it advances to the heat flow downstream side 143, and the heat flux (heat energy flowing through the unit area per unit time) becomes high. As a result, the temperature difference Δθ of the support portions 44L and 44R can be reduced between the heat flow upstream side 142 on the movable mold 33 side and the heat flow downstream side 143 on the opposite side. When the temperature difference Δθ between the heat flow upstream side 142 and the heat flow downstream side 143 of the support portions 44L and 44R is small, the thermal deformation of the support portions 44L and 44R can be suppressed. As a result, it is possible to suppress the occurrence of deflection due to thermal deformation of the support portions 44L and 44R of the movable platen 13.

図６、図７を参照して本実施形態の効果についてさらに説明する。 The effects of this embodiment will be further described with reference to FIGS. 6 and 7.

まず、可動プラテン１３の支持部４４Ｌ、４４Ｒの熱変形によるたわみが発生する要因を説明する。可動プラテン１３では、金型取付面４１Ａに取り付けられる可動金型３３が固定金型３２との型開閉動作によって発熱するため、可動プラテン１３には、Ｘ正方向側の金型取付面４１Ａから熱が入る。金型取付面４１Ａから可動プラテン１３の表側部４１、中間部４３、裏側部４２を通って、支持部４４Ｌ、４４ＲのＸ正方向側端部に伝達される。
First, the factors that cause bending due to thermal deformation of the support portions 44L and 44R of the movable platen 13 will be described. In the movable platen 13, the movable mold 33 attached to the mold mounting surface 41A generates heat due to the mold opening / closing operation with the fixed mold 32, so that the movable platen 13 is formed from the mold mounting surface 41A on the X positive direction side. I get a fever. It is transmitted from the mold mounting surface 41A to the X positive direction end portions of the support portions 44L and 44R through the front side portion 41, the intermediate portion 43, and the back side portion 42 of the movable platen 13.

支持部４４Ｌ、４４Ｒに伝達された熱流Ｈは、支持部４４Ｌ、４４Ｒ内をＸ負方向側に流れて、Ｘ負方向側の端部から逃げる。このため、支持部４４Ｌ、４４ＲのＸ方向両側面で温度差Δθが生じる。温度差Δθが生じると、高温部と低温部では部材の膨張量の違うため、支持部４４Ｌ、４４Ｒの熱変形によるたわみが生じてしまう。

The heat flow H transmitted to the support portions 44L and 44R flows in the support portions 44L and 44R on the X negative direction side and escapes from the end portion on the X negative direction side. Therefore, a temperature difference Δθ is generated on both side surfaces of the support portions 44L and 44R in the X direction. When the temperature difference Δθ occurs, the expansion amount of the member differs between the high temperature portion and the low temperature portion, so that the support portions 44L and 44R are bent due to thermal deformation.

本実施形態の可動プラテン１３の支持部４４Ｌ、４４Ｒは、上述のとおりセンター支持構造であるので、熱源は支持部４４Ｌ、４４ＲのＸ正方向側の側面にある。このため、Ｘ正方向側の側面から支持部４４Ｌ、４４Ｒ内に熱が流れた場合に、支持部４４Ｌ、４４ＲのＸ方向の両側面の温度差Δθを低減する工夫が必要となる。具体的には、熱流Ｈの経路に沿って、支持部４４Ｌ、４４Ｒの断面積Ｓを変化させることで温度差Δθを小さくする。 Since the support portions 44L and 44R of the movable platen 13 of the present embodiment have the center support structure as described above, the heat source is on the side surface of the support portions 44L and 44R on the X positive direction side. Therefore, when heat flows into the support portions 44L and 44R from the side surface on the X positive direction side, it is necessary to devise a method for reducing the temperature difference Δθ on both side surfaces of the support portions 44L and 44R in the X direction. Specifically, the temperature difference Δθ is reduced by changing the cross-sectional area S of the support portions 44L and 44R along the path of the heat flow H.

支持部４４Ｌ、４４ＲのＸ方向の両側面の間の領域が、ある温度勾配ｄθ／ｄｘにある場合、両側面間を通る熱流量Ｑは一定となる。ここでフーリエの法則によって下記（１）式の関係式が成り立つ。 When the region between the side surfaces of the support portions 44L and 44R in the X direction is at a certain temperature gradient dθ / dx, the heat flow rate Q passing between the both side surfaces is constant. Here, the relational expression of the following equation (1) is established by Fourier's law.

Figure 0007080695000001
ここで、Ｓは脚部の断面積、ｘは脚部のＸ方向の幅、λは熱伝導率、Ｑは熱流量である。
Figure 0007080695000001
 Here, S is the cross-sectional area of the leg, x is the width of the leg in the X direction, λ is the thermal conductivity, and Q is the heat flow rate.

熱伝導率λや熱流量Ｑはｘによらず一定であるため、断面積Ｓと温度勾配ｄθ／ｄｘは以下の（２）式の関係となる。 Since the thermal conductivity λ and the heat flow rate Q are constant regardless of x, the cross-sectional area S and the temperature gradient dθ / dx have the relationship of the following equation (2).

Figure 0007080695000002
Figure 0007080695000002

したがって、断面積Ｓが小さくなれば、温度勾配ｄθ／ｄｘは大きくなる。また断面積Ｓが大きくなれば温度勾配ｄθ／ｄｘは小さくなる。つまり、熱源から近いほど断面積Ｓを大きくして温度勾配ｄθ／ｄｘを小さくすれば、支持部４４Ｌ、４４Ｒ内でＸ方向に沿って温度を下がりにくくでき、支持部４４Ｌ、４４ＲのＸ方向両側面の温度差Δθを低減できると考えられる。 Therefore, the smaller the cross-sectional area S, the larger the temperature gradient dθ / dx. Further, the larger the cross-sectional area S, the smaller the temperature gradient dθ / dx. That is, if the cross-sectional area S is increased and the temperature gradient dθ / dx is reduced as it is closer to the heat source, it is possible to make it difficult for the temperature to drop along the X direction in the support portions 44L and 44R, and both sides of the support portions 44L and 44R in the X direction. It is considered that the surface temperature difference Δθ can be reduced.

支持部４４Ｌ、４４Ｒ内で熱流Ｈの経路の幅は、可動プラテン１３の裏側部４２と支持部４４Ｌ、４４Ｒとの接続部から溝１４１の上端１４１Ａとの間である。熱流下流側１４３の断面積Ｓを徐々に小さくするために、本実施形態では支持部４４Ｌ、４４Ｒの外側表面に設けた溝１４１の上端１４１Ａを傾斜させる構造としている。 The width of the path of the heat flow H in the support portions 44L and 44R is between the back side portion 42 of the movable platen 13 and the connection portion between the support portions 44L and 44R and the upper end 141A of the groove 141. In order to gradually reduce the cross-sectional area S of the heat flow downstream side 143, in the present embodiment, the upper end 141A of the groove 141 provided on the outer surface of the support portions 44L and 44R is inclined.

図６は、溝１４１の上端１４１Ａの傾斜角度αに応じた熱流上流側１４２と熱流下流側１４３との間の温度差Δθを示す図である。図６の横軸が傾斜角度αを示し、縦軸は温度差Δθを示す。図７は、傾斜角度αの定義を示す模式図である。図７（ａ）に示すように、傾斜角度αが正値とは（α＞０）、本実施形態の構造と同様に、熱流下流側１４３の上端１４１Ａの位置が、熱流上流側１４２の位置よりも上側にある構成であり、熱流下流側１４３に溝１４１の上端１４１Ａの角がある。この構成では、αが正方向に増大するほど傾斜が減少する。また、図７（ｂ）に示すように、傾斜角度αが負値とは（α＜０）、本実施形態の構造とは逆に、熱流上流側１４２の上端１４１Ａの位置が、熱流下流側１４３の位置よりも上側にある構成であり、熱流上流側１４２に溝１４１の上端１４１Ａの角がある。この構成では、αが負方向に増大するほど傾斜が減少する。 FIG. 6 is a diagram showing a temperature difference Δθ between the heat flow upstream side 142 and the heat flow downstream side 143 according to the inclination angle α of the upper end 141A of the groove 141. The horizontal axis of FIG. 6 indicates the inclination angle α, and the vertical axis indicates the temperature difference Δθ. FIG. 7 is a schematic diagram showing the definition of the tilt angle α. As shown in FIG. 7A, the inclination angle α is a positive value (α> 0), and the position of the upper end 141A of the heat flow downstream side 143 is the position of the heat flow upstream side 142, as in the structure of the present embodiment. The configuration is on the upper side of the groove 141, and the corner of the upper end 141A of the groove 141 is located on the downstream side 143 of the heat flow. In this configuration, the slope decreases as α increases in the positive direction. Further, as shown in FIG. 7B, the inclination angle α is a negative value (α <0), and contrary to the structure of the present embodiment, the position of the upper end 141A of the heat flow upstream side 142 is the heat flow downstream side. The configuration is above the position of 143, and the corner of the upper end 141A of the groove 141 is located on the upstream side 142 of the heat flow. In this configuration, the slope decreases as α increases in the negative direction.

図６に示すように、傾斜角度αが正値の場合の方が、負値の場合よりも温度差Δθが少なくなることがわかる。また、傾斜角度αが正値の範囲では、傾斜角度αが４０°～５０°に近づくにつれて温度差Δθが減少する傾向がある。以上より、溝１４１の上端１４１Ａの傾斜角度αは、例えば３０～６０°程度であるのが好ましい。 As shown in FIG. 6, it can be seen that the temperature difference Δθ is smaller when the inclination angle α is a positive value than when it is a negative value. Further, in the range where the inclination angle α is a positive value, the temperature difference Δθ tends to decrease as the inclination angle α approaches 40 ° to 50 °. From the above, it is preferable that the inclination angle α of the upper end 141A of the groove 141 is, for example, about 30 to 60 °.

図８は、実施形態の変形例を示す模式図である。図８に示すように、熱流上流側１４２と熱流下流側１４３との温度差Δθを低減させる調整部として、支持部４４Ｌ、４４Ｒの熱流上流側１４２を放熱または冷却することによって熱流上流側１４２の温度を下げる温度低減部を設けてもよい。温度低減部としては、例えば、熱流上流側１４２の端面に送風して熱流上流側１４２を冷却するためのファン１３１や、熱流上流側１４２の端面に設けられ熱流上流側１４２の放熱を促進させるためのフィン１３２や切り欠き１３３を適用できる。 FIG. 8 is a schematic diagram showing a modified example of the embodiment. As shown in FIG. 8, as an adjusting unit for reducing the temperature difference Δθ between the heat flow upstream side 142 and the heat flow downstream side 143, the heat flow upstream side 142 of the support portions 44L and 44R is radiated or cooled to dissipate heat or cool. A temperature reducing unit for lowering the temperature may be provided. As the temperature reducing unit, for example, a fan 131 for blowing air to the end face of the heat flow upstream side 142 to cool the heat flow upstream side 142, or a fan 131 provided on the end face of the heat flow upstream side 142 to promote heat dissipation of the heat flow upstream side 142. Fin 132 and notch 133 can be applied.

以上、具体例を参照しつつ本実施形態について説明した。しかし、本開示はこれらの具体例に限定されるものではない。これら具体例に、当業者が適宜設計変更を加えたものも、本開示の特徴を備えている限り、本開示の範囲に包含される。前述した各具体例が備える各要素およびその配置、条件、形状などは、例示したものに限定されるわけではなく適宜変更することができる。前述した各具体例が備える各要素は、技術的な矛盾が生じない限り、適宜組み合わせを変えることができる。 The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Those skilled in the art with appropriate design changes to these specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the above-mentioned specific examples, its arrangement, conditions, a shape, and the like are not limited to those exemplified, and can be appropriately changed. The combinations of the elements included in each of the above-mentioned specific examples can be appropriately changed as long as there is no technical contradiction.

上記実施形態では、可動プラテン１３の支持部４４Ｌ、４４Ｒに溝１４１を設ける構成を例示したが、図１，２に示すように、固定プラテン１２の支持部５４Ｌ，５４Ｒにも溝１５１を設けてもよい。この場合、溝１５１の上端１５１Ａの角は、固定金型３２（固定プラテン１２の金型設置面）とはＸ方向の反対側、すなわち溝１４１とは反対側のＸ正方向側に設けられる。 In the above embodiment, the configuration in which the groove 141 is provided in the support portions 44L and 44R of the movable platen 13 is exemplified, but as shown in FIGS. 1 and 2, the groove 151 is also provided in the support portions 54L and 54R of the fixed platen 12. May be good. In this case, the corner of the upper end 151A of the groove 151 is provided on the side opposite to the fixed mold 32 (the mold installation surface of the fixed platen 12) in the X direction, that is, on the X positive direction side opposite to the groove 141.

また、溝１４１は、支持部４４Ｌ、４４Ｒの外側表面ではなく、内側（可動プラテン１３の裏側部４２側）の表面に設けてもよい。 Further, the groove 141 may be provided on the inner surface (the back side portion 42 side of the movable platen 13) instead of the outer surface of the support portions 44L and 44R.

上記実施形態では、溝１４１の上端１４１Ａの傾斜は直線状の構成を例示したが、熱流上流側１４２と熱流下流側１４３との間で熱経路の断面積が減少すればよく、上端１４１Ａの傾斜は曲線状でもよい。 In the above embodiment, the inclination of the upper end 141A of the groove 141 exemplifies a linear configuration, but it is sufficient that the cross-sectional area of the heat path between the heat flow upstream side 142 and the heat flow downstream side 143 is reduced, and the inclination of the upper end 141A is sufficient. May be curved.

１０ 射出成形機
１２ 固定プラテン
１３ 可動プラテン
４１Ａ 金型取付面
４２Ｌ，４２Ｒ 側面
４４Ｌ，４４Ｒ，５４Ｌ，５４Ｒ 支持部
１４１，１５１ 溝（調整部）
１４１Ａ，１５１Ａ 溝の上端
１４２ 熱流上流側
１４３ 熱流下流側
１３１ ファン（温度低減部）
１３２ フィン（温度低減部）
１３３ 切り欠き（温度低減部）
３３ 可動金型
Ｈ 熱流
Δθ 温度差 10 Injection molding machine 12 Fixed platen 13 Movable platen 41A Mold mounting surface 42L, 42R Side surface 44L, 44R, 54L, 54R Support part 141,151 Groove (adjustment part)
141A, 151A Upper end of groove 142 Heat flow upstream side 143 Heat flow downstream side 131 Fan (temperature reduction part)
132 fins (temperature reduction unit)
133 Notch (Temperature reduction part)
33 Movable mold H Heat flow Δθ Temperature difference

Claims (5)

金型が取り付けられる金型取付面が設けられるプラテンを具備し、
前記プラテンは、前記金型取付面と直交する一対の側面からそれぞれ外側に延在して設けられ、前記プラテンを支持する一対の支持部を備え、
前記支持部が、前記金型が設置される側の熱流上流側と、その反対側の熱流下流側との温度差を低減させる調整部を有し、
前記調整部は、水平方向においての前記熱流上流側と前記熱流下流側の温度差を低減させる、
射出成形機。 Equipped with a platen provided with a mold mounting surface on which the mold can be mounted,
The platen is provided extending outward from a pair of side surfaces orthogonal to the mold mounting surface, and includes a pair of support portions for supporting the platen.
The support portion has an adjusting portion that reduces the temperature difference between the heat flow upstream side on the side where the mold is installed and the heat flow downstream side on the opposite side.
The adjusting unit reduces the temperature difference between the upstream side of the heat flow and the downstream side of the heat flow in the horizontal direction.
Injection molding machine. 前記調整部は、前記支持部の表面に設けられる溝を含み、
前記溝の上端は、前記熱流上流側が前記熱流下流側より前記側面から離れるように傾斜して形成される、
請求項１に記載の射出成形機。 The adjusting portion includes a groove provided on the surface of the supporting portion.
The upper end of the groove is formed so as to be inclined so that the upstream side of the heat flow is separated from the side surface from the downstream side of the heat flow.
The injection molding machine according to claim 1. 前記調整部は、前記支持部の表面に設けられる溝を含み、
前記溝は、前記側面から前記熱流下流側の上端までの距離が、前記側面から前記熱流上流側の上端までの距離より短くなるよう形成される、
請求項１に記載の射出成形機。 The adjusting portion includes a groove provided on the surface of the supporting portion.
The groove is formed so that the distance from the side surface to the upper end on the downstream side of the heat flow is shorter than the distance from the side surface to the upper end on the upstream side of the heat flow.
The injection molding machine according to claim 1. 前記調整部は、前記支持部の表面に設けられる溝を含み、
前記溝は、前記熱流上流側から前記熱流下流側への方向の幅が、前記熱流下流側の上端角部から前記熱流上流側に広がるよう形成される、
請求項１に記載の射出成形機。 The adjusting portion includes a groove provided on the surface of the supporting portion.
The groove is formed so that the width in the direction from the upstream side of the heat flow to the downstream side of the heat flow extends from the upper end corner of the downstream side of the heat flow to the upstream side of the heat flow.
The injection molding machine according to claim 1. 前記調整部は、前記支持部の前記熱流上流側を放熱または冷却することによって前記熱流上流側の温度を下げる温度低減部を含む、
請求項１～４のいずれか１項に記載の射出成形機。 The adjusting unit includes a temperature reducing unit that lowers the temperature on the upstream side of the heat flow by radiating or cooling the upstream side of the heat flow of the support unit.
The injection molding machine according to any one of claims 1 to 4.
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