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JP4266272B2 - Resin mold - Google Patents
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JP4266272B2 - Resin mold - Google Patents

Resin mold Download PDF

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Publication number
JP4266272B2
JP4266272B2 JP2000171325A JP2000171325A JP4266272B2 JP 4266272 B2 JP4266272 B2 JP 4266272B2 JP 2000171325 A JP2000171325 A JP 2000171325A JP 2000171325 A JP2000171325 A JP 2000171325A JP 4266272 B2 JP4266272 B2 JP 4266272B2
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Japan
Prior art keywords
recess
mold
narrow groove
heat medium
metal layer
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JP2000171325A
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JP2001347525A (en
Inventor
実基彦 木村
文人 上羽
正照 辻
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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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、金型本体14をバックプレート16Rで覆い、このバックプレート16Rに温調流体供給管22R及び温調流体排出管24Rを接続したものである。
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、温調流体供給管22Rから多孔質焼結金属で形成した金型本体14に加熱媒体又は冷却媒体を流すときに、金型本体14には特に加熱媒体又は冷却媒体を温調流体供給管22Rから温調流体排出管24Rに流すだけのものなので、加熱媒体又は冷却媒体を金型本体14の表層に流すことが困難である。この結果、金型本体14に温度むらが発生することがある。
上記▲2▼の金型では、多孔質材の部分域3に表層7をメッキで形成したので、部分域3に流す冷却水が直接、表層7に触れることができず、冷却効率の悪化を招くことがある。
【0004】
そこで、本発明の目的は、キャビティに近い部分に熱媒体を積極的に流通させることができ、金型の加熱・冷却サイクルの短縮を図ることが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、凹部の底がキャビティに近づくように凹部を金型本体に開け、この金型本体の凹部に焼結金属層を形成し、凹部を蓋部材で塞ぎ、焼結金属層に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ことで、金型本体を強制冷却又は強制加熱することのできる樹脂成形金型であって、凹部の底に、熱媒体を流通させる細幅溝を形成し、少なくともこの細幅溝に接する部分に細幅溝の溝幅よりも大径の金属粒を配置することを特徴とする。
【0006】
凹部の底がキャビティに近づくように凹部を金型本体に開け、この金型本体の凹部に焼結金属層を形成し、凹部を蓋部材で塞ぎ、焼結金属層に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ことで、金型本体を強制冷却又は強制加熱する。このときに、凹部の底に、熱媒体を流通させる細幅溝を形成し、少なくとも細幅溝に接する部分に細幅溝の溝幅よりも大径の金属粒を配置する。
すなわち、凹部の底に、熱媒体を流通させる細幅溝を形成し、この細幅溝に接する部分に細幅溝の溝幅よりも大径の金属粒を配置することで、キャビティに近い部分に熱媒体を流通させる共に、熱媒体を流す隙間を確保して凹部の底に熱媒体を積極的に流すようにする。
【0007】
請求項2は、細幅溝の断面を円弧断面としたことを特徴とする。
細幅溝の断面を円弧断面として、キャビティから焼結金属層に加わる成形圧の分散化を図る。
【0008】
【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。
【0009】
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に形成した複数の入口としての入水口36・・・(・・・は複数個を示す。以下同じ)及び出口としての排水口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。
【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。
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の強度を補間するための第1のリブ38・・・を備えたものである。
底33hは、熱媒体(不図示)を流通させる細幅溝51・・・を形成しT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って、底33hに形成した細幅溝51・・・に接する部分に細幅溝51・・・の溝幅よりも大径の金属粒53を配置した金属層である。
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って、
【0011】
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の強度を補間する部材である。
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。
【0012】
図4は図3の4部拡大図であり、底33hに形成した細幅溝51・・・に接する部分に細幅溝51・・・の溝幅よりも大径の金属粒53を配置することで、これらの細幅溝51・・・にも熱媒体(不図示)を流通させ、熱媒体を流す隙間を確保して底33hに熱媒体を積極的に流す構造にしたことを示す。この結果、キャビティ50に近い部位の金型本体31に、直接、熱媒体を流すことができるので、加熱又は冷却時間の短縮を図ることができる。
また、細幅溝51・・・の断面を、一例として円弧断面としたものである。従って、キャビティ50から焼結金属層34に加わる成形圧の分散化を図ることができる。
【0013】
図5は図1の5−5線断面図であり、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を流通させることで、金型本体31を強制冷却又は強制加熱することのできる樹脂成形金型であって、凹部33の底33hに、熱媒体(不図示)を流通させる細幅溝51・・・を形成し、少なくとも細幅溝51・・・に接する部分に細幅溝51・・・の溝幅よりも大径の金属粒53を配置する構造にしたことを示す。
【0014】
すなわち、可動側金型30は、凹部33の底33hに、熱媒体を流通させる細幅溝51を形成し、この細幅溝51に接する部分に細幅溝51の溝幅よりも大径の金属粒53を配置することで、キャビティ50に近い部分に熱媒体を流通させる共に、熱媒体を流す隙間を確保して凹部33の底33hに熱媒体を積極的に流すことができる。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】
言い換えれば、可動側金型30は、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6(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53・・・を凹部33に充填する。
(c)において、凹部33に金属粒53・・・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面の仕上を行ない、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7(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33に焼結金属層104を形成し、金型本体101に複数の入水口106・・・及び排水口107・・・を形成したものであって、入水口106から熱媒体(不図示)を凹部103に矢印▲1▼,▲1▼の如く供給すると、凹部103の表面に熱媒体を集中させて流すことはできないと考えられる。
【0019】
(b)において、可動側金型30は、凹部33の底33hに複数の細幅溝51・・・を形成したので、入水口36から熱媒体(不図示)を供給するときに、凹部33の底33hに矢印▲2▼,▲2▼の如く熱媒体を集中させて流すことができるので、金型温度を迅速に制御することができる。
【0020】
図8は本発明に係る樹脂成形金型の第3作用説明図であり、可動側金型30は、凹部33の底33hに、焼結金属層34を構成する金属粒53の外径よりも狭幅であって円弧断面の細幅溝51・・・を形成したものである。従って、キャビティ50から焼結金属層34に加わる成形圧を矢印▲4▼・・・の如く分散化を図ることができる。この結果、実質的に金型本体31の剛性の向上を図ることができる。
【0021】
図9は本発明に係る樹脂成形金型の別実施例の細幅溝の拡大図であり、細幅溝56・・・の断面を、矩形断面としたものであって、底33hに形成した細幅溝56・・・に接する部分に細幅溝56・・・の溝幅よりも大径の金属粒53を配置することで、これらの細幅溝56・・・にも熱媒体(不図示)を流通させ、底33hに熱媒体を積極的に流す構造にしたことを示す。
【0022】
図10は本発明に係る第2実施の形態の樹脂成形金型の部分断面図であり、樹脂成形金型としての可動側金型60の部分断面を示す。なお、可動側金型30と同一部品は同一符号を用い詳細な説明を省略する。
31は金型本体、32は成形凸部、33は凹部、33hは凹部33の底、51・・・は細幅溝、64は凹部に形成する焼結金属層であり、可動側金型60は、焼結金属層64を多層構造とし、細幅溝51・・・に臨む第1層64Aを構成する金属粒63の外径を細幅溝51・・・を超えるようにし、その他の層64B,64Cを構成する金属粒63B,63Cの外径を任意の外径にしたものである。
【0023】
例えば、第2層64Bの金属粒63Bの外径をより大きなものを使用することで、焼結金属層64全体に流せる熱媒体(不図示)の量を増やすことができ、迅速に金型温度を調整することができる。
また、第2層64Bの金属粒63Bの外径をより小さなものを使用することで、凹部33の底33hに熱媒体(不図示)を集中させて、迅速に金型温度を調整することができる。
さらに、その他の層64B,64Cを構成する金属粒63B,63Cの大きさを任意なものを使用できるので、焼結金属層64を安価に製作できる。この結果、可動側金型60のコストの低減を図ることができる。
【0024】
尚、第2の実施の形態では図9に示すように、焼結金属層64を第1層64A及びその他の層64B,64Cの3層構造としたが、これに限るものではなく、2層以上であればよい。また、その他の層の金属粒の粒径を大小混ぜたものを使用したものであってもよい。この場合、任意の大きさの金属粒を混ぜることで、金型強度の向上を図ることができる。
【0025】
【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、凹部の底に、熱媒体を流通させる細幅溝を形成し、少なくともこの細幅溝に接する部分に細幅溝の溝幅よりも大径の金属粒を配置したので、キャビティに近い部分に熱媒体を流通させることができる共に、熱媒体を流す隙間を確保して熱媒体を凹部の底に積極的に流すことができる。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。
【0026】
請求項2は、細幅溝の断面を円弧断面としたので、キャビティから焼結金属層に加わる成形圧の分散化を図ることができる。この結果、実質的に金型本体の剛性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3の4部拡大図
【図5】図1の5−5線断面図
【図6】本発明に係る樹脂成形金型の第1作用説明図
【図7】本発明に係る樹脂成形金型の第2作用説明図
【図8】本発明に係る樹脂成形金型の第3作用説明図
【図9】本発明に係る樹脂成形金型の別実施例の細幅溝の拡大図
【図10】本発明に係る第2実施の形態の樹脂成形金型の部分断面図
【符号の説明】
30,60…樹脂成形金型(可動側金型)、31…金型本体、33…凹部、33h…底、34,64…焼結金属層、50…キャビティ、51,56…細幅溝、53…金属粒、64A…第1層、64B,64C…その他の層。
[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 made of metal, synthetic resin, ceramic, or the like is formed in the cavity, and the mold body 14 is covered with a back plate 16R, and a temperature control fluid supply pipe 22R and a temperature control fluid discharge pipe 24R are connected to the back plate 16R. Is.
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 above resin molding die (1), when a heating medium or a cooling medium is passed from the temperature control fluid supply pipe 22R to the mold body 14 formed of porous sintered metal, In particular, since the heating medium or the cooling medium is merely flowed from the temperature control fluid supply pipe 22R to the temperature control fluid discharge pipe 24R, it is difficult to flow the heating medium or the cooling medium to the surface layer of the mold body 14. As a result, temperature unevenness may occur in the mold body 14.
In the above mold (2), since the surface layer 7 is formed by plating in the partial region 3 of the porous material, the cooling water flowing through the partial region 3 cannot directly touch the surface layer 7 and the cooling efficiency is deteriorated. You may be invited.
[0004]
Therefore, an object of the present invention is to provide a resin molding die that can actively distribute a heat medium in a portion close to a cavity and can shorten the heating / cooling cycle of the die.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, claim 1 opens a recess in the mold body so that the bottom of the recess approaches the cavity, forms a sintered metal layer in the recess of the mold body, and closes the recess with a lid member. , A resin molding die capable of forcibly cooling or forcibly heating the mold body by circulating a cooling medium or a heating medium as a heating medium through the sintered metal layer, A narrow groove through which the medium is circulated is formed, and metal grains having a diameter larger than the groove width of the narrow groove are arranged at least in a portion in contact with the narrow groove.
[0006]
Open the recess in the mold body so that the bottom of the recess approaches the cavity, form a sintered metal layer in the recess of the mold body, close the recess with a lid member, and use the cooling metal or heating for the sintered metal layer The mold body is forcibly cooled or forcibly heated by circulating a heat medium as a medium. At this time, a narrow groove through which the heat medium is circulated is formed at the bottom of the recess, and metal grains having a diameter larger than the groove width of the narrow groove are disposed at least in a portion in contact with the narrow groove.
That is, a portion close to the cavity is formed by forming a narrow groove through which the heat medium flows at the bottom of the recess, and disposing metal particles having a diameter larger than the groove width of the narrow groove in a portion in contact with the narrow groove. In addition, the heat medium is circulated and the gap through which the heat medium flows is secured to actively flow the heat medium to the bottom of the recess.
[0007]
According to a second aspect of the present invention, the cross section of the narrow groove is an arc cross section.
Dispersion of the molding pressure applied from the cavity to the sintered metal layer is made with the cross section of the narrow groove as an arc cross section.
[0008]
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.
[0009]
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 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 on the recess 33, and firing of these. A lid member 35 that collectively covers the bonded metal layer 34 and the concave portion 33, and a plurality of inlets 36 (... are the same; the same applies hereinafter) and outlets as a plurality of inlets formed in the mold body 31 As a drain outlet 37. 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.
[0010]
3 is a cross-sectional view taken along the line 3-3 in FIG.
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 interpolating the strength of the cavity 50.
The bottom 33h is formed with narrow grooves 51 through which a heat medium (not shown) is circulated.
The sintered metal layer 34 is a member for circulating a cooling medium or a heating medium as a heat medium (not shown), and has a narrow width at a portion in contact with the narrow groove 51 formed in the bottom 33h. This is a metal layer in which metal grains 53 having a diameter larger than the groove width of the grooves 51.
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,
[0011]
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 interpolates the strength of the cavity 50 together with the first ribs 38.
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. .
[0012]
FIG. 4 is an enlarged view of part 4 of FIG. 3, in which metal grains 53 having a diameter larger than the groove width of the narrow grooves 51... Are arranged in a portion in contact with the narrow grooves 51. Thus, it is shown that a heat medium (not shown) is circulated through these narrow grooves 51... To secure a gap for flowing the heat medium and to actively flow the heat medium to the bottom 33h. As a result, since the heat medium can flow directly to the mold main body 31 at a position close to the cavity 50, the heating or cooling time can be shortened.
Moreover, the cross section of the narrow groove 51 ... is made into the circular arc cross section as an example. Accordingly, it is possible to disperse the molding pressure applied to the sintered metal layer 34 from the cavity 50.
[0013]
FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 1. 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). A sintered metal layer 34 is formed in the recess 33 of the mold body 31, the recess 33 is closed with a lid member 35, and a cooling medium or a heating medium as a heating medium is circulated through the sintered metal layer 34. The mold body 31 is a resin molding die capable of forcibly cooling or forcibly heating, and a narrow groove 51... For circulating a heat medium (not shown) is formed in the bottom 33 h of the recess 33, and at least fine. It shows that it was set as the structure which has arrange | positioned the metal particle 53 larger diameter than the groove width of the narrow groove | channel 51 ... in the part which touches the wide groove | channel 51 ....
[0014]
That is, the movable-side mold 30 has a narrow groove 51 through which a heat medium flows in the bottom 33 h of the recess 33, and a diameter larger than the groove width of the narrow groove 51 at a portion in contact with the narrow groove 51. By disposing the metal particles 53, the heat medium can be circulated in a portion close to the cavity 50, and a gap through which the heat medium flows can be secured to actively flow the heat medium to the bottom 33 h of the recess 33. As a result, the heating / cooling cycle of the movable mold 30 can be shortened, and the molding cost can be reduced.
[0015]
In other words, the movable-side mold 30 is such that the recess 33 is formed in the mold body 31 so as to leave the first ribs 38, and as a result, the recess 33 has a plurality of flow paths 33A. 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. 6A to 6D are first operation explanatory views of the resin mold according to the present invention, and show an example of a 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 recess 33 is filled with metal particles 53 of iron-based metal, aluminum-based metal, or stainless steel.
In (c), the mold body 31 in which the recesses 33 are filled with the metal particles 53... Is put in the sintering furnace 54, and the metal particles 53. .
[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, and when the thickness between 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]
FIGS. 7A and 7B are explanatory views of the second 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 mold 100 as a resin molding mold is formed with a molding projection 102 in a mold body 101, a recess 103 in a mold body 101, and a sintered metal layer in the recess 33. 104, and a plurality of water inlets 106... And water outlets 107... Are formed in the mold body 101, and a heat medium (not shown) is passed through the water inlet 106 into the recess 103 by the arrow ▲ 1. If it is supplied as ▼ and ▲ 1, it is considered that the heat medium cannot be concentrated and flowed on the surface of the recess 103.
[0019]
In (b), since the movable mold 30 is formed with a plurality of narrow grooves 51... In the bottom 33 h of the recess 33, when supplying a heat medium (not shown) from the water inlet 36, the recess 33 Since the heat medium can be concentrated and flowed to the bottom 33h of the metal as shown by arrows (2) and (2), the mold temperature can be controlled quickly.
[0020]
FIG. 8 is an explanatory view of the third function of the resin molding die according to the present invention. The movable side die 30 is formed on the bottom 33h of the concave portion 33 with respect to the outer diameter of the metal particles 53 constituting the sintered metal layer 34. Narrow grooves 51 are formed with a narrow width and a circular arc cross section. Therefore, the forming pressure applied from the cavity 50 to the sintered metal layer 34 can be dispersed as indicated by the arrows (4). As a result, the rigidity of the mold body 31 can be substantially improved.
[0021]
FIG. 9 is an enlarged view of a narrow groove of another embodiment of the resin molding die according to the present invention, in which the cross section of the narrow groove 56 is a rectangular cross section and is formed on the bottom 33h. By disposing the metal grains 53 having a diameter larger than the groove width of the narrow grooves 56... In a portion in contact with the narrow grooves 56. The figure shows that the heat medium is actively flowed to the bottom 33h.
[0022]
FIG. 10 is a partial cross-sectional view of the resin molding die according to the second embodiment of the present invention, and shows a partial cross-section of a movable side mold 60 as a resin molding die. The same parts as those of the movable mold 30 are denoted by the same reference numerals, and detailed description thereof is omitted.
31 is a mold main body, 32 is a molding convex part, 33 is a concave part, 33 h is a bottom of the concave part 33, 51... Are narrow grooves, 64 is a sintered metal layer formed in the concave part, and the movable side mold 60. The sintered metal layer 64 has a multi-layer structure, and the outer diameter of the metal grains 63 constituting the first layer 64A facing the narrow grooves 51... Exceeds the narrow grooves 51. The outer diameters of the metal grains 63B and 63C constituting the 64B and 64C are set to arbitrary outer diameters.
[0023]
For example, by using a larger outer diameter of the metal particles 63B of the second layer 64B, the amount of heat medium (not shown) that can flow through the entire sintered metal layer 64 can be increased, and the mold temperature can be quickly increased. Can be adjusted.
Further, by using a smaller outer diameter of the metal particles 63B of the second layer 64B, it is possible to concentrate the heat medium (not shown) on the bottom 33h of the recess 33 and quickly adjust the mold temperature. it can.
Furthermore, since the metal grains 63B and 63C constituting the other layers 64B and 64C can have any size, the sintered metal layer 64 can be manufactured at low cost. As a result, the cost of the movable mold 60 can be reduced.
[0024]
In the second embodiment, as shown in FIG. 9, the sintered metal layer 64 has a three-layer structure of the first layer 64A and the other layers 64B and 64C. However, the present invention is not limited to this. That is all you need. Moreover, what mixed the size of the particle size of the metal grain of another layer may be used. In this case, the strength of the mold can be improved by mixing metal particles of any size.
[0025]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to the first aspect of the present invention, a narrow groove through which the heat medium flows is formed at the bottom of the recess, and metal grains having a diameter larger than the groove width of the narrow groove are disposed at least in a portion in contact with the narrow groove. It is possible to circulate the heat medium in a portion close to, and to positively flow the heat medium to the bottom of the recess by securing a gap for flowing the heat medium. As a result, the heating / cooling cycle of the mold can be shortened, and the molding cost can be reduced.
[0026]
According to the second aspect of the present invention, since the cross section of the narrow groove is an arc cross section, the forming pressure applied to the sintered metal layer from the cavity can be dispersed. As a result, the rigidity of the mold body can be substantially 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 in FIG. 1. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 1. FIG. 6 is a diagram illustrating a first function of the resin molding die according to the present invention. FIG. 7 is a second function description of the resin molding die according to the present invention. FIG. 8 is an explanatory view of the third action of the resin molding die according to the present invention. FIG. 9 is an enlarged view of a narrow groove of another embodiment of the resin molding die according to the present invention. Partial sectional view of the resin molding die of the second embodiment [Explanation of symbols]
30, 60 ... Resin molding die (movable side die), 31 ... Mold body, 33 ... Recess, 33h ... Bottom, 34, 64 ... Sintered metal layer, 50 ... Cavity, 51, 56 ... Narrow groove, 53 ... Metal grains, 64A ... First layer, 64B, 64C ... Other layers.

Claims (2)

凹部の底がキャビティに近づくように凹部を金型本体に開け、この金型本体の凹部に焼結金属層を形成し、前記凹部を蓋部材で塞ぎ、前記焼結金属層に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ことで、金型本体を強制冷却又は強制加熱することのできる樹脂成形金型であって、
前記凹部の底に、前記熱媒体を流通させる細幅溝を形成し、少なくともこの細幅溝に接する部分に細幅溝の溝幅よりも大径の金属粒を配置することを特徴とする樹脂成形金型。
The recess is opened in the mold body so that the bottom of the recess approaches the cavity, a sintered metal layer is formed in the recess of the mold body, the recess is closed with a lid member, and a cooling medium or A resin molding die capable of forcibly cooling or forcibly heating the die body by circulating a heating medium as a heating medium,
A resin characterized in that a narrow groove through which the heat medium flows is formed at the bottom of the recess, and metal particles having a diameter larger than the groove width of the narrow groove are disposed at least in a portion in contact with the narrow groove. Molding mold.
前記細幅溝の断面を、円弧断面としたことを特徴とする請求項1記載の樹脂成形金型。2. The resin molding die according to claim 1, wherein the narrow groove has a circular arc cross section.
JP2000171325A 2000-06-07 2000-06-07 Resin mold Expired - Fee Related JP4266272B2 (en)

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