JP4261029B2

JP4261029B2 - Resin mold

Info

Publication number: JP4261029B2
Application number: JP2000174524A
Authority: JP
Inventors: 実基彦木村; 文人上羽; 正照辻
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2000-06-09
Filing date: 2000-06-09
Publication date: 2009-04-30
Anticipated expiration: 2020-06-09
Also published as: JP2001347527A

Description

【０００１】
【発明の属する技術分野】
本発明は樹脂成形金型の改良に関する。
【０００２】
【従来の技術】
樹脂成形金型として、例えば▲１▼特開平７−２８５１６９号公報「樹脂成形用金型」や▲２▼実開平６−９７４４号公報「金型」が知られている。
上記▲１▼は、同公報の図１によれば、金型本体１４（符号は公報に記載の符号を流用）を加熱又は冷却のために多孔質焼結金属で形成し、金型本体１４のキャビティに金属、合成樹脂又はセラッミクなどの表面被膜１２を形成したものである。
上記▲２▼は、同公報の図１によれば、金型１のキャビティ２表面近傍に冷却のために多孔質材の部分域３を形成し、この部分域３にメッキ等の表層７を形成し、この表層７の反対から部分域３に給水路４及び排水路５を接続したものである。
【０００３】
【発明が解決しようとする課題】
しかし、上記▲１▼の樹脂成形用金型では、金型本体１４を多孔質焼結金属で形成し、金型本体１４のキャビティに金属、合成樹脂又はセラッミクなどの表面被膜１２で覆っただけのものなので、ショットを重ねると多孔質焼結金属が潰され、キャビティの変形を招く。
上記▲２▼の金型では、単に、多孔質材の部分域３に給水路４及び排水路５を接続しただけのものなので、給水路４近くの冷却効果が大きく、排水路５近くでは冷却効果が小さいことになり、給水路４と排水路５とで金型に冷却効果のばらつきが発生する。
【０００４】
そこで、本発明の目的は、金型の強度を維持しつつ熱媒体の流路を形成すると共に、金型本体の温度の均一化を図ることのできる樹脂成形金型を提供することにある。
【０００５】
【課題を解決するための手段】
上記目的を達成するために請求項１は、金型本体に、多孔質の焼結金属層を設け、この焼結金属層へ冷却用媒体又は加熱用媒体としての熱媒体を流通させる樹脂成形金型において、焼結金属層を構成する金属粒を、熱媒体の供給側が小径で排出側が大径になるように熱媒体の流れに沿って粒径を連続的若しくは段階的に変化させたことを特徴とする。
【０００６】
焼結金属層を構成する金属粒を、熱媒体の供給側が小径で排出側が大径になるように熱媒体の流れに沿って粒径を連続的若しくは段階的に変化させる。
熱媒体は供給側では冷却又は加熱能力が大きいが、排出側では冷却又は加熱能力が小さくなる。そこで、熱媒体の供給側では金属粒を小径にすることで、流速を高めて熱媒体の貯溜時間を縮め、熱媒体の排出側では金属粒を大径にすることで、流速を低くして熱媒体の貯溜時間を延ばし、冷却又は加熱能力の均一化を図り、これをもって金型本体の温度の均一化を図る。
【０００７】
【発明の実施の形態】
本発明の実施の形態を添付図に基づいて以下に説明する。なお、図面は符号の向きに見るものとする。
図１は本発明に係る樹脂成形金型の斜視図である。
樹脂金型装置２０は、樹脂成形金型としての可動側金型３０と樹脂成形金型としての固定側金型４０とから構成するものであって、可動側金型３０に成形凸部３２を形成し、固定側金型４０に成形凹部４２を形成し、これらの成形凹部４２及び成形凸部３２を合せることで樹脂成形品Ｗを成形するためのキャビティ５０を形成するものである。
【０００８】
図２は図１の２−２線断面図であり、可動側金型３０の縦断面を示す。
可動側金型３０は、金型本体３１に形成した成形凸部３２と、金型本体３１に形成した凹部３３と、この凹部３３内に形成する多孔質の焼結金属層３４と、これらの焼結金属層３４及び凹部３３を一括して覆う蓋部材３５と、金型本体３１に形成した熱媒体の供給側としての入水口３６・・・（・・・は複数個を示す。以下同じ）及び熱媒体の排出側としての排水口３７・・・とからなる。なお、本図では、入水口３６・・・及び排水口３７・・・は一個のみを示す。
固定側金型４０は、金型本体４１に成形凹部４２を備え、金型本体４１に可動側金型３０と略同一の凹部、焼結金属層、蓋部材、入水口及び排水口を備えるものであり、詳細な説明は省略する。
【０００９】
凹部３３は、底３３ｈがキャビティ５０に近づくように金型本体３１に開けたものであり、キャビティ５０の強度を高めるための第１のリブ３８・・・を備えたものである。
焼結金属層３４は、熱媒体（不図示）としての冷却用媒体又は加熱用媒体を流通させるための部材であり、入水口３６側に小径の金属粒５３Ａを配置し、入水口３６側と排水口３７側との中間に中径の金属粒５３Ｂを配置し、排水口３７側に大径の金属粒５３Ｃを配置して焼結した金属層である。熱媒体（不図示）は、焼結金属層３４を流通させることで可動側金型３０を強制冷却又は強制加熱を図るための媒体である。
【００１０】
図３は図１の３−３線断面図であり、可動側金型３０の横断面を示す。
蓋部材３５は、焼結金属層３４及び凹部３３を一括して覆うベース部３５ａと、このベース部３５ａに形成する第２のリブ３９・・・とからなる部材であり、第１のリブ３８・・・の先端にベース部３５ａを当てることで第１のリブ３８・・・と共にキャビティ５０の強度を高める部材である。
第２のリブ３９・・・は、第１のリブ３８・・・の軸線Ｃ・・・上に配置することで、可動側金型３０の放熱効果の促進を図ることを狙ったものである。すなわち、第１のリブ３８・・・は、補強部材であると共に熱伝導部材でもある。そこで、第１のリブ３８・・・と第２のリブ３９・・・を一直線上に並べれば、熱の流れが円滑となり、金型本体３１の放熱機能を格段に高めることができる。
【００１１】
以上に述べたように、可動側金型３０は、金型本体３１に、多孔質の焼結金属層３４を設け、この焼結金属層３４へ冷却用媒体又は加熱用媒体としての熱媒体（不図示）を流通させる樹脂成形金型において、焼結金属層３４を構成する金属粒５３Ａ〜５３Ｃを、熱媒体の供給側（入水口側３６）が小径で排出側（排水口３７側）が大径になるように熱媒体の流れに沿って粒径を連続的若しくは段階的に変化させたものである。
【００１２】
可動側金型３０は焼結金属層３４を構成する金属粒５３Ａ〜５３Ｃを、熱媒体の入水口３６側が小径で排水口３７側が大径になるように熱媒体の流れに沿って粒径を連続的若しくは段階的に変化させるようにすることで、例えば、熱媒体（不図示）は入水口３６側では冷却又は加熱能力が大きいが、排水口３７側では冷却又は加熱能力が小さくなる。そこで、熱媒体の入水口３６側では金属粒５３Ａを小径にすることで、流速を高めて熱媒体の貯溜時間を縮め、熱媒体の排水口３７側では金属粒５３Ｃを大径にすることで、流速を低くして熱媒体の貯溜時間を延ばし、冷却又は加熱能力の均一化を図り、これをもって金型本体３１の温度の均一化を図る。
この結果、金型本体３１の温度の均一化を図ることができ、樹脂成形品Ｗ（図１参照）の品質の向上を図ることができる。
【００１３】
さらに、言及すれば、キャビティ５０へ樹脂を射出若しくは投入すると樹脂成形圧が金型本体３１にかかる。このとき、第１のリブ３８・・・並びに蓋部材３５が補強部材となって金型本体３１の変形、すなわち、キャビティ５０の変形を防止する役割を果たす。金型本体３１に第１のリブ３８・・・を付設し、これらの第１のリブ３８・・・の先端を蓋部材３５で支持させる構造を採用したことでキャビティ５０の形状を良好に保てる。
【００１４】
また、凹部３３の底３３ｈから蓋部材３５に至る第１のリブ３８・・・を金型本体３１に付設すると共に、蓋部材３５に外側へ延びる第２のリブ３９・・・を付設したので、金型本体３１の放熱効果の向上を図ることができる。
可動側金型３０は、第１のリブ３８・・・の軸線Ｃ・・・上に第２のリブ３９・・・を配置したので、金型本体３１の放熱効果のさらなる促進を図ることができる。この結果、可動側金型３０の加熱・冷却サイクルの短縮を図ることができ、成形コストの削減を図ることができる。
【００１５】
図４は図１の４−４断面図であり、可動側金型３０の平面断面を示す。
可動側金型３０は、言い換えれば、第１のリブ３８・・・を残すようなかたちで、金型本体３１に凹部３３を形成したものであり、結果として、凹部３３は複数の流路３３Ａ〜３３Ｆ（ここでは、凹部３３を流路３３Ａ〜３３Ｆと呼ぶことにする）を形成したかたちになり、それぞれの流路３３Ａ〜３３Ｆに焼結金属層３４を設け、それぞれの流路３３Ａ〜３３Ｆに入水口３６・・・及び排水口３７・・・を設けたものとも言える。
従って、凹部３３をそれぞれの流路３３Ａ〜３３Ｆに仕切ることで、熱媒体（不図示）を均一に流すことができるので、金型温度のばらつきの低減を図ることができる。
【００１６】
以上に述べた可動側金型３０（樹脂成形金型）の作用を次に説明する。
図５（ａ）〜（ｄ）は本発明に係る樹脂成形金型の第１作用説明図であり、可動側金型３０（図３参照）の製作手順の一例を示す。
（ａ）において、金属ブロック５２に成形凸部３２及び凹部３３を形成し、金型本体３１を製作する。
（ｂ）において、鉄系金属、アルミニウム系金属若しくはステンレス鋼の金属粒５３Ａ・・・、金属粒５３Ｂ・・・及び金属粒５３Ｃ・・・（ここでは、５３Ｂ・・・のみ示す）を凹部３３に充填する。
（ｃ）において、凹部３３内に金属粒５３Ａ・・・、金属粒５３Ｂ・・・及び金属粒５３Ｃ・・・（５３Ｂ・・・のみ示す）を充填済みの金型本体３１を焼結炉５４に入れ、金属粒５３・・・同士を焼結させ、焼結金属層３４を形成する。
【００１７】
（ｄ）において、蓋部材３５で焼結金属層３４及び凹部３３を一括して覆い、ボルト締め又は熱溶着を行ない、凹部３３を密封する。その後、成形凸部３２面の仕上を行なう。例えば、成形凸部３２面と凹部３３の底３３ｈ面との厚さをｔとするときに、厚さｔを２ｍｍから５ｍｍの範囲に設定する。ここで、厚さｔが２ｍｍ以下では成形凸部３２の強度が不足する。また、５ｍｍ以上では冷却効率又は熱効率の悪化を招く。
【００１８】
図６（ａ），（ｂ）は本発明に係る樹脂成形金型の第２作用説明図であり、（ａ）は比較例を示し、（ｂ）は実施例を示す。
（ａ）において、樹脂成形金型としての可動側金型１００は、金型本体１０１に成形凸部１０２を形成し、金型本体１０１に凹部１０３を形成し、この凹部１０３内に焼結金属層１０４形成し、これらの焼結金属層１０４及び凹部１０３を一括して平板の蓋部材１０５で覆ったものである。ここで、成形凸部１０２に矢印▲１▼の如く成形圧が加わることを想定すると、成形凸部１０２の強度を高める補強リブ（不図示）等がないので、成形凸部１０２はショットを重ねていくと二点鎖線で示すように変形を招く虞れがある。
【００１９】
（ｂ）において、可動側金型３０は、凹部３３の底３３ｈがキャビティ５０（図３参照）に近づくように凹部３３を金型本体３１に開け、この金型本体３１の凹部３３内に焼結金属層３４を形成し、凹部３３を蓋部材３５で塞ぎ、焼結金属層３４に冷却用媒体又は加熱用媒体としての熱媒体（不図示）を流通させるようにしたので、キャビティ５０の強度を維持しつつ熱媒体の通路を形成することができる。この結果、耐久性を向上させた樹脂成形金型を得ることができる。また、凹部３３の底３３ｈから蓋部材３５に至る第１のリブ３８・・・を金型本体３１に付設すると共に、蓋部材３５に外側へ延びる第２のリブ３９・・・を付設したので、金型本体３１の放熱効果の向上を図ることができる。
すなわち、第１のリブ３８・・・は、補強部材であると共に熱伝導部材でもある。そこで、第１のリブ３８・・・と第２のリブ３９・・・を一直線上に並べれば、熱の流れが円滑となり、金型本体３１の放熱機能を格段に高めることができる。
【００２０】
例えば、可動側金型３０は、第１のリブ３８・・・の軸線Ｃ・・・上に第２のリブ３９・・・を配置したので、第１のリブ３８から第２のリブ３９に矢印▲２▼の如く熱が流れ、第２のリブ３９から大気中に矢印▲３▼・・・の如く放熱させる。すなわち、金型本体３１の放熱効果のさらなる促進を図ることができる。この結果、金型の加熱・冷却サイクルの短縮を図ることができ、成形コストの削減を図ることができる。
【００２１】
図７（ａ），（ｂ）は本発明に係る樹脂成形金型の第３作用説明図であり、（ａ）は比較例を示し、（ｂ）は実施例を示す。
（ａ）において、樹脂成形金型としての可動側金型１１０は、金型本体１１１に成形凸部１１２を形成し、金型本体１１１に凹部１１３・・・を形成し、これらの凹部１１３・・・にそれぞれ略々同径の金属粒１１５にて構成した焼結金属層１１４・・・を形成し、金型本体１１１の一方に入水口１１６・・・を形成し、金型本体１１１の他方に排水口１１７・・・を形成したものである。
入水口１１６から矢印▲４▼・・・の如く熱媒体（不図示）を凹部１１３にそれぞれ供給すると、金属粒１１５は略々同径なので熱媒体が流れる隙間Ｓも、ほぼ同一面積の空間であるため、熱媒体が金型本体１１１に作用する時間は一定である。従って、金型本体１１１の入水口１１６・・・側で冷却又は加熱した分だけ、排水口１１７・・・での加熱又は冷却の能力は小さくなるので、金型本体１１１に温度差が生ずる。
【００２２】
（ｂ）において、可動側金型３０は、焼結金属層３４を構成する金属粒５３Ａ〜５３Ｃを、入水口３６側に小径の金属粒５３Ａを配置し、入水口３６側と排水口３７側との中間に中径の金属粒５３Ｂを配置し、排水口３７側に大径の金属粒５３Ｃを配置した。ここで、熱媒体（不図示）が流れる金属粒５３Ａの隙間をＳ１、熱媒体が流れる金属粒５３Ｂの隙間をＳ２、熱媒体が流れる金属粒５３Ｂの隙間をＳ３とすれば、これらの隙間Ｓ１〜Ｓ３が大きいほど熱媒体が介在できるので冷却又は加熱の能力が大きいと考えられる。
【００２３】
すなわち、熱媒体（不図示）は入水口３６側では冷却又は加熱能力が大きいが、排水口３７側では冷却又は加熱能力が小さくなる。そこで、熱媒体の入水口３６側では金属粒５３Ａを小径にすることで、流速を高めて熱媒体の貯溜時間を縮め、熱媒体の排水口３７側では金属粒５３Ｃを大径にすることで、流速を低くして熱媒体の貯溜時間を延ばしたので、冷却又は加熱能力の均一化を図り、これをもって金型本体３１の温度の均一化を図ることができる。
【００２４】
従って、入水口３６・・・から熱媒体（不図示）を流れを矢印▲５▼・・・の如く流すと、熱媒体は金属粒５３Ａで構成する焼結金属層３４部分より、金属粒５３Ｃで構成する焼結金属層３４部分により多く熱媒体が介在させ、熱媒体が凹部３３を流れることで加熱又は冷却の能力は小さくなった分の是正を図る。この結果、金型本体３１の温度の均一化を図ることができ、樹脂成形品Ｗ（図１参照）の品質の向上を図ることができる。
【００２５】
尚、実施の形態では図４に示すように、焼結金属層３４を３つの粒径の異なる金属粒５３Ａ〜５３Ｃを配設したが、３つに限るものではなく、焼結金属層の供給側の金属粒の粒径と排出側の金属粒の粒径げ異なるものであればよい。
また、実施の形態では図４に示すように、焼結金属層３４を３つの粒径の異なる金属粒５３Ａ〜５３Ｃを段階的に配設したが、これに限るものではなく、熱媒体の供給側が小径で排出側が大径になるように熱媒体の流れに沿って粒径を連続的若しくは段階的に変化させたものであればよい。
【００２６】
【発明の効果】
本発明は上記構成により次の効果を発揮する。
請求項１は、焼結金属層を構成する金属粒、熱媒体の供給側が小径で排出側が大径になるように熱媒体の流れに沿って粒径を連続的若しくは段階的に変化させた。すなわち、熱媒体の供給側では金属粒を小径にすることで、流速を高めて熱媒体の貯溜時間を縮め、熱媒体の排出側では金属粒を大径にすることで、流速を低くして熱媒体の貯溜時間を延ばしたので、金型本体の温度の均一化を図ることができる。
この結果、金型本体の温度の均一化を図ることができ、樹脂成形品の品質の向上を図ることができる。
【図面の簡単な説明】
【図１】本発明に係る樹脂成形金型の斜視図
【図２】図１の２−２線断面図
【図３】図１の３−３線断面図
【図４】図１の４−４断面図
【図５】本発明に係る樹脂成形金型の第１作用説明図
【図６】本発明に係る樹脂成形金型の第２作用説明図
【図７】本発明に係る樹脂成形金型の第３作用説明図
【符号の説明】
３０…樹脂成形金型（可動側金型）、３１…金型本体、３３…凹部、３４…焼結金属層、３６…供給側（入水口）、３７…排出側（排水口）、５３Ａ〜５３Ｃ…金属粒。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a resin molding die.
[0002]
[Prior art]
As resin molding dies, for example, (1) Japanese Patent Laid-Open No. 7-285169 “Resin Mold” and (2) Japanese Utility Model Publication No. 6-9744 “Mold” are known.
According to the above (1), according to FIG. 1 of the publication, the mold body 14 (the reference numeral is the same as the reference numeral) is formed of a porous sintered metal for heating or cooling. A surface coating 12 such as metal, synthetic resin or ceramic is formed in the cavity.
According to the above (2), according to FIG. 1 of the publication, a partial region 3 of a porous material is formed in the vicinity of the surface of the cavity 2 of the mold 1 for cooling, and a surface layer 7 such as plating is formed in the partial region 3. The water supply channel 4 and the drainage channel 5 are connected to the partial area 3 from the opposite side of the surface layer 7.
[0003]
[Problems to be solved by the invention]
However, in the resin molding die of the above (1), the mold body 14 is formed of a porous sintered metal, and the cavity of the mold body 14 is simply covered with the surface coating 12 such as metal, synthetic resin or ceramic. Therefore, when the shots are repeated, the porous sintered metal is crushed and the cavity is deformed.
In the above mold (2), since the water supply channel 4 and the drainage channel 5 are simply connected to the partial region 3 of the porous material, the cooling effect near the water supply channel 4 is great. The effect is small, and the cooling effect varies in the mold between the water supply channel 4 and the drainage channel 5.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a resin molding die that can form a heat medium flow path while maintaining the strength of the die and can make the temperature of the die body uniform.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, claim 1 is a resin molding die in which a porous sintered metal layer is provided on a mold body, and a cooling medium or a heating medium as a heating medium is circulated through the sintered metal layer. In the mold, the particle size of the sintered metal layer is changed continuously or stepwise along the flow of the heat medium so that the supply side of the heat medium has a small diameter and the discharge side has a large diameter. Features.
[0006]
The particle size of the metal particles constituting the sintered metal layer is changed continuously or stepwise along the flow of the heat medium such that the supply side of the heat medium has a small diameter and the discharge side has a large diameter.
The heat medium has a large cooling or heating capability on the supply side, but has a small cooling or heating capability on the discharge side. Therefore, by reducing the diameter of the metal particles on the supply side of the heat medium, the flow rate is increased and the storage time of the heat medium is shortened. On the discharge side of the heat medium, the flow diameter is decreased by increasing the diameter of the metal particles. The storage time of the heat medium is extended, the cooling or heating capacity is made uniform, and the temperature of the mold body is made uniform.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a perspective view of a resin molding die according to the present invention.
The resin mold apparatus 20 includes a movable mold 30 as a resin mold and a fixed mold 40 as a resin mold, and a molding convex portion 32 is provided on the movable mold 30. The cavity 50 for molding the resin molded product W is formed by forming the molding recess 42 in the fixed mold 40 and combining the molding recess 42 and the molding projection 32.
[0008]
FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1 and shows a vertical cross section of the movable mold 30.
The movable side mold 30 includes a molding protrusion 32 formed on the mold body 31, a recess 33 formed on the mold body 31, a porous sintered metal layer 34 formed in the recess 33, and these The lid member 35 that collectively covers the sintered metal layer 34 and the recess 33, and the water inlets 36... ) And a drain outlet 37 as a discharge side of the heat medium. In addition, in this figure, the water inlet 36 ... and the drain port 37 ... show only one piece.
The fixed-side mold 40 includes a mold body 41 having a molding recess 42, and the mold body 41 includes substantially the same recess as the movable-side mold 30, a sintered metal layer, a lid member, a water inlet, and a drain port. Therefore, detailed description is omitted.
[0009]
The recess 33 is formed in the mold main body 31 so that the bottom 33 h approaches the cavity 50, and includes first ribs 38... For increasing the strength of the cavity 50.
The sintered metal layer 34 is a member for circulating a cooling medium or a heating medium as a heat medium (not shown). The small diameter metal particles 53A are arranged on the water inlet 36 side, This is a metal layer in which medium-sized metal particles 53B are arranged in the middle of the drain port 37 side, and large-diameter metal particles 53C are arranged on the drain port 37 side and sintered. The heat medium (not shown) is a medium for forcedly cooling or forcibly heating the movable mold 30 by circulating the sintered metal layer 34.
[0010]
3 is a cross-sectional view taken along the line 3-3 in FIG.
The lid member 35 is a member that includes a base portion 35a that collectively covers the sintered metal layer 34 and the concave portion 33, and second ribs 39 that are formed in the base portion 35a. Is a member that increases the strength of the cavity 50 together with the first ribs 38 ... by applying the base portion 35a to the tip of the ....
The second ribs 39... Are intended to promote the heat dissipation effect of the movable mold 30 by being arranged on the axis C... Of the first ribs 38. . That is, the first ribs 38 ... are not only a reinforcing member but also a heat conducting member. Therefore, if the first ribs 38 and the second ribs 39 are arranged in a straight line, the heat flow becomes smooth and the heat radiation function of the mold body 31 can be remarkably enhanced.
[0011]
As described above, the movable mold 30 is provided with the porous sintered metal layer 34 in the mold body 31, and the sintered metal layer 34 has a heat medium (a cooling medium or a heating medium ( In a resin molding die that distributes (not shown), the metal particles 53A to 53C constituting the sintered metal layer 34 are arranged such that the heat medium supply side (water inlet side 36) has a small diameter and the discharge side (drain port 37 side) The particle diameter is changed continuously or stepwise along the flow of the heat medium so as to have a large diameter.
[0012]
The movable-side mold 30 has the metal particles 53A to 53C constituting the sintered metal layer 34 having a particle size along the flow of the heat medium such that the heat medium inlet 36 side has a small diameter and the drain port 37 side has a large diameter. By changing continuously or stepwise, for example, the heat medium (not shown) has a large cooling or heating capability on the water inlet 36 side, but has a small cooling or heating capability on the drain port 37 side. Therefore, by reducing the diameter of the metal particles 53A on the heat medium inlet 36 side, the flow rate is increased to shorten the storage time of the heat medium, and on the heat medium outlet 37 side, the metal particles 53C are increased in diameter. The flow rate is lowered to extend the storage time of the heat medium, the cooling or heating capacity is made uniform, and the temperature of the mold body 31 is made uniform.
As a result, the temperature of the mold body 31 can be made uniform, and the quality of the resin molded product W (see FIG. 1) can be improved.
[0013]
In addition, when resin is injected or injected into the cavity 50, resin molding pressure is applied to the mold body 31. At this time, the first ribs 38 and the lid member 35 serve as reinforcing members to prevent the deformation of the mold body 31, that is, the deformation of the cavity 50. The first ribs 38... Are attached to the mold body 31, and the end of the first ribs 38. .
[0014]
Further, the first ribs 38... Extending from the bottom 33 h of the recess 33 to the lid member 35 are attached to the mold body 31, and the second ribs 39. The heat dissipation effect of the mold body 31 can be improved.
Since the movable-side mold 30 has the second ribs 39... Disposed on the axis C... Of the first ribs 38..., The heat dissipation effect of the mold body 31 can be further promoted. it can. As a result, the heating / cooling cycle of the movable mold 30 can be shortened, and the molding cost can be reduced.
[0015]
4 is a cross-sectional view taken along the line 4-4 of FIG.
In other words, the movable mold 30 is formed by forming the recess 33 in the mold body 31 so as to leave the first ribs 38... As a result, the recess 33 has a plurality of flow paths 33 A. To 33F (here, the concave portion 33 will be referred to as flow paths 33A to 33F), a sintered metal layer 34 is provided in each flow path 33A to 33F, and each flow path 33A to 33F is formed. It can be said that the water inlets 36... And the drain ports 37.
Therefore, since the heat medium (not shown) can be made to flow uniformly by partitioning the recess 33 into the respective flow paths 33A to 33F, variation in mold temperature can be reduced.
[0016]
Next, the operation of the movable mold 30 (resin mold) described above will be described.
FIGS. 5A to 5D are first operation explanatory views of the resin mold according to the present invention, and show an example of the manufacturing procedure of the movable mold 30 (see FIG. 3).
In (a), the molding convex part 32 and the recessed part 33 are formed in the metal block 52, and the metal mold body 31 is manufactured.
In (b), the metal particles 53A..., The metal particles 53B..., And the metal particles 53C (only 53B. To fill.
In (c), the mold main body 31 filled with the metal particles 53A..., The metal particles 53B. And sintering the metal particles 53... To form the sintered metal layer 34.
[0017]
In (d), the sintered metal layer 34 and the concave portion 33 are collectively covered with the lid member 35, bolted or thermally welded, and the concave portion 33 is sealed. Thereafter, the surface of the molding convex portion 32 is finished. For example, when the thickness of the molding convex portion 32 surface and the bottom 33h surface of the concave portion 33 is t, the thickness t is set in the range of 2 mm to 5 mm. Here, when the thickness t is 2 mm or less, the strength of the molding convex portion 32 is insufficient. On the other hand, if it is 5 mm or more, the cooling efficiency or the thermal efficiency is deteriorated.
[0018]
6 (a) and 6 (b) are explanatory views of the second action of the resin mold according to the present invention, (a) shows a comparative example, and (b) shows an example.
In (a), a movable mold 100 as a resin molding mold is formed with a molding projection 102 on a mold body 101, a recess 103 on a mold body 101, and a sintered metal in the recess 103. The layer 104 is formed, and the sintered metal layer 104 and the recess 103 are collectively covered with a flat lid member 105. Here, assuming that molding pressure is applied to the molding convex portion 102 as indicated by the arrow (1), there is no reinforcing rib (not shown) or the like that increases the strength of the molding convex portion 102, so the molding convex portion 102 overlaps shots. As it goes on, there is a risk of deformation as shown by the two-dot chain line.
[0019]
In (b), the movable mold 30 opens the recess 33 in the mold body 31 so that the bottom 33h of the recess 33 approaches the cavity 50 (see FIG. 3), and the mold 30 is baked into the recess 33 of the mold body 31. The bonded metal layer 34 is formed, the recess 33 is closed with the lid member 35, and a cooling medium or a heating medium (not shown) as a heating medium is circulated through the sintered metal layer 34. The passage of the heat medium can be formed while maintaining the above. As a result, a resin mold having improved durability can be obtained. Further, the first ribs 38... Extending from the bottom 33 h of the recess 33 to the lid member 35 are attached to the mold body 31, and the second ribs 39. The heat dissipation effect of the mold body 31 can be improved.
That is, the first ribs 38 ... are not only a reinforcing member but also a heat conducting member. Therefore, if the first ribs 38 and the second ribs 39 are arranged in a straight line, the heat flow becomes smooth and the heat radiation function of the mold body 31 can be remarkably enhanced.
[0020]
For example, the movable side mold 30 has the second ribs 39... Arranged on the axis C... Of the first ribs 38. Heat flows as indicated by arrow (2), and heat is radiated from the second rib 39 into the atmosphere as indicated by arrow (3). In other words, the heat dissipation effect of the mold body 31 can be further promoted. As a result, the heating / cooling cycle of the mold can be shortened, and the molding cost can be reduced.
[0021]
FIGS. 7A and 7B are explanatory views of the third action of the resin molding die according to the present invention. FIG. 7A shows a comparative example and FIG. 7B shows an example.
In (a), a movable side mold 110 as a resin molding die is formed with a molding convex part 112 on the mold main body 111 and concave parts 113... A sintered metal layer 114 composed of metal particles 115 having substantially the same diameter is formed on each of the metal bodies 115, and a water inlet 116 is formed on one side of the mold body 111. A drainage port 117 is formed on the other side.
When a heat medium (not shown) is supplied from the water inlet 116 to the recess 113 as indicated by the arrow (4)..., The metal particles 115 have substantially the same diameter. Therefore, the time during which the heat medium acts on the mold body 111 is constant. Accordingly, the heating or cooling capacity at the drain ports 117... Is reduced by the amount of cooling or heating at the water inlets 116... Of the mold body 111, so that a temperature difference occurs in the mold body 111.
[0022]
In (b), the movable-side mold 30 has metal particles 53A to 53C constituting the sintered metal layer 34 and small-diameter metal particles 53A on the water inlet 36 side, and the water inlet 36 side and the water outlet 37 side. The middle-sized metal particles 53B are disposed in the middle, and the large-sized metal particles 53C are disposed on the drain outlet 37 side. Here, if the gap between the metal particles 53A through which the heat medium (not shown) flows is S1, the gap between the metal particles 53B through which the heat medium flows is S2, and the gap between the metal particles 53B through which the heat medium flows is S3, these gaps S1. Since a heat medium can intervene so that -S3 is large, it is thought that the capability of cooling or heating is large.
[0023]
That is, the heat medium (not shown) has a large cooling or heating capability on the water inlet 36 side, but has a small cooling or heating capability on the drain port 37 side. Therefore, by reducing the diameter of the metal particles 53A on the heat medium inlet 36 side, the flow rate is increased to shorten the storage time of the heat medium, and on the heat medium outlet 37 side, the metal particles 53C are increased in diameter. Since the heat medium storage time is extended by lowering the flow rate, the cooling or heating ability can be made uniform, and the temperature of the mold body 31 can be made uniform.
[0024]
Accordingly, when a heat medium (not shown) flows from the water inlets 36... As indicated by the arrows (5), the heat medium flows from the portion of the sintered metal layer 34 composed of the metal particles 53A to the metal particles 53C. A larger amount of the heat medium is interposed in the sintered metal layer 34 portion constituted by the steps described above, and the heat medium or the heat medium flows through the recesses 33 so that the heating or cooling ability is reduced. As a result, the temperature of the mold body 31 can be made uniform, and the quality of the resin molded product W (see FIG. 1) can be improved.
[0025]
In the embodiment, as shown in FIG. 4, the sintered metal layer 34 is provided with three metal particles 53 A to 53 C having different particle diameters, but the number is not limited to three. It is sufficient if the particle size of the metal particles on the side is different from the particle size of the metal particles on the discharge side.
In the embodiment, as shown in FIG. 4, the sintered metal layer 34 is provided with three metal particles 53 A to 53 C having different particle sizes in a stepwise manner. What is necessary is just to change the particle size continuously or stepwise along the flow of the heat medium so that the side has a small diameter and the discharge side has a large diameter.
[0026]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
In the first aspect, the particle size is changed continuously or stepwise along the flow of the heat medium so that the metal particles constituting the sintered metal layer have a small diameter on the supply side of the heat medium and a large diameter on the discharge side. That is, by reducing the diameter of the metal particles on the supply side of the heat medium, the flow rate is increased and the storage time of the heat medium is shortened. On the discharge side of the heat medium, the flow diameter is decreased by increasing the diameter of the metal particles. Since the storage time of the heat medium is extended, the temperature of the mold body can be made uniform.
As a result, the temperature of the mold body can be made uniform, and the quality of the resin molded product can be improved.
[Brief description of the drawings]
1 is a perspective view of a resin mold according to the present invention. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1. FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. FIG. 5 is a diagram illustrating a first operation of the resin molding die according to the present invention. FIG. 6 is a diagram illustrating a second operation of the resin molding die according to the present invention. Third action illustration of mold [Explanation of symbols]
DESCRIPTION OF SYMBOLS 30 ... Resin molding die (movable side die), 31 ... Mold main body, 33 ... Recess, 34 ... Sintered metal layer, 36 ... Supply side (water inlet), 37 ... Discharge side (drain port), 53A- 53C: Metal grains.

Claims

In a resin molding mold in which a porous sintered metal layer is provided in a mold body, and a heat medium as a cooling medium or a heating medium is circulated through the sintered metal layer,
The metal particles constituting the sintered metal layer are obtained by changing the particle size continuously or stepwise along the flow of the heat medium such that the supply side of the heat medium has a small diameter and the discharge side has a large diameter. A resin mold characterized by that.