JP3765992B2

JP3765992B2 - Mold for resin molding

Info

Publication number: JP3765992B2
Application number: JP2001132529A
Authority: JP
Inventors: 正治山住
Original assignee: 株式会社山正製作所
Priority date: 2001-04-27
Filing date: 2001-04-27
Publication date: 2006-04-12
Anticipated expiration: 2021-04-27
Also published as: JP2002326238A

Description

【０００１】
【発明の属する技術分野】
本発明は、樹脂成形製品を製造する樹脂成形用金型に関する。
【０００２】
【従来の技術】
従来から樹脂成形品は、射出成形法などの金型を使用した工法により生産されている。かかる金型の一例として、図６に示す如く、凸型金型５０と凹型金型５１とで構成されたものがある。かかる凸型金型５０と凹型金型５１は、前記凹型金型５１の凹部内に凸型金型５０の凸部を位置させて最終製品（樹脂成形品）の形状と同等の形状をした空間を形成するようになっている。
【０００３】
この凸型金型５０及び凹型金型５１で樹脂成形品を製造するときは、まず凸型金型５０及び凹型金型５１を予熱し、その後に凸型金型５０及び凹型金型５１で形成した空間内に樹脂を流し込む。そして、凸型金型５０及び凹型金型５１の空間形成面に接触した樹脂が固化するように、凸型金型５０及び凹型金型５１の温度が低下するまで放置するのである。凸型金型５０及び凹型金型５１の温度が低下した後に、凹型金型５１を凸型金型５０から離間させて樹脂成形品を取り出す。このような一連の作業によって、樹脂成形品が製造されるのである。
【０００４】
このようにして使用される金型は、一般的に鋳造によって製作される。この鋳造方法は、砂型鋳造法、ダイカスト鋳造法など色々な方法がある。しかし、金型は、量産を必要としないため、一般的に砂型内に溶融した金属を流し込んで鋳物を成形する砂型鋳造法によって製作されることが多い。
【０００５】
この砂型鋳造法で金型を製作するときは、まず、最終製品（樹脂成形品）の形状に対応した金型と略同等の形状の木型を作成する。この木型は、製品を製造する金型の基となるものであるため、出来あがった金型に欠け等の欠陥が生じないように、溶融された金属、すなわち、湯が砂型内の隅々にまで流れ込むように考慮されて作成されるのである。そして、このように作成された木型を基に鋳物砂を押し固めて砂型をつくり、該砂型内に溶融させた金属を流し込む。その後、砂型内の溶融金属が固化するようにそのまま放置、すなわち、溶融金属が固化するように溶融金属の温度が低下するのを待つのである。このような工程を経て固化したものが鋳物金型の半製品となるのである。
【０００６】
その後、かかる半製品は、金型として必要とされる精度を得るために、バリ取りや、表面加工などの機械加工がなされるとともに、金型内に樹脂を円滑に充填するための空気抜き用のスリット（図示せず）が施されて完成品となる。
【０００７】
【発明が解決しようとする課題】
しかしながら、上記工法によって製作された金型は、前述した通り、湯の流動性を考慮してなされたものであるため、必要以上の肉厚のものになってしまう。特に、金型の角部は、肉厚が非常に厚いものとなるので、金型自体が重量物となるのである。これにより金型を支持する射出成形機などの機器自体の強度を上げなければならなかった。
【０００８】
また、金型の肉厚が厚かったため、樹脂成形する工程での金型の予熱及び冷却時間に長時間をし、一つの樹脂成形品を製造する製造時間が長時間となり、生産性を悪くする場合があった。さらに、必要以上の肉厚とされるため、金型の製作コストが高かった。
【００１０】
そこで、本発明は、必要最低限の強度を維持して軽量化し、低コストで製造することができ、樹脂成形品の製造時間を短縮することができる樹脂成形用金型を提供することを課題とする。
【００１１】
【課題を解決するための手段】
上記課題を解決すべく、本発明に係る樹脂成形用金型は、第一金型１と第二金型２とを組み合わせて最終製品の形状と略同等の形状空間が形成され、該形状空間内に溶融樹脂を注入して樹脂成形品を製造する樹脂成形用金型において、前記第一金型１は、複数の分割片３ａ，３ｂ，４，５が連結されてなる凸型金型とされるとともに、前記第二金型２は、複数の分割片６ａ，６ｂ，７が連結されてなる凹型金型とされ、前記凹型金型２の凹部内に前記凸型金型１の凸部を位置させて最終製品の形状と略同等の形状空間が形成されてなり、前記凸型金型１を形成する前記複数の分割片３ａ，３ｂ，４，５は、互いに連接されて周壁を形成する複数の分割片３ａ，３ｂと、該複数の分割片３ａ，３ｂの各一端にネジ部材８によって連結され、周壁の一端開口を覆う蓋を形成する分割片４と、周壁を形成する前記複数の分割片３ａ，３ｂの各他端にネジ部材８によって連結され、前記凹型金型２の凹部内に凸型金型１の凸部を位置させた際に、前記凹型金型２の凹部開口を封止する鍔部を形成する分割片５とで構成される一方、前記凹型金型２を形成する前記複数の分割片６ａ，６ｂ，７は、ネジ部材８によって互いに連結されて周壁を形成する複数の分割片６ａ，６ｂと、該複数の分割片６ａ，６ｂの各一端にネジ部材８によって連結され、周壁の一端開口を覆う蓋を形成する分割片７とで構成されてなることを特徴とする。
【００１２】
上記構成の樹脂成形用金型は、複数の分割片３ａ，３ｂ，４，５，６ａ，６ｂ，７の各々に、必要最小限の強度を有する板厚の薄い板材などに機械加工を施して用いれば、軽量な金型を製作することができる。また、各部材を肉厚を薄いものとすることができるので、樹脂成形工程における予熱及び冷却時間を短縮することができる。さらに、板材にアルミ合金のような熱伝導率の高い材料を用いれば、いっそう予熱及び冷却時間を短縮することができる。したがって、樹脂成形時間の短縮が可能となる。
【００１３】
また、鋳造による金型の製作のように、機械加工に至るまでの前工程、すなわち、木型製作及び鋳込み作業を必要としないので、金型の製造工数が少なくなる。さらに、一般的な機械加工のみで金型を製作することができるので、低コストで樹脂成形用金型を製作することができる。
【００１４】
また、前記第一金型１は、前記複数の分割片３ａ，３ｂ，４，５が連結されてなる凸型金型とされるとともに、前記第二金型２は、前記複数の分割片６ａ，６ｂ，７が連結されてなる凹型金型とされ、前記凹型金型２の凹部内に前記凸型金型１の凸部を位置させて最終製品の形状と略同等の形状空間が形成されるので、前記凸型金型１の凸部で器状の樹脂成形品の内面を成形し、前記凹型金型２の凹部で器状の樹脂成形品の外面を成形することができる器状の樹脂成形用金型とすることができる。
【００１５】
このように構成された樹脂成形用金型は、複数の分割片３ａ，３ｂ，４，５，６ａ，６ｂ，７の各々を板材の曲げ加工や切削加工することができるので、精度の良い、肉厚の薄い、軽量化したものとすることができる。
【００１６】
さらに、前記凸型金型１を形成する前記複数の分割片３ａ，３ｂ，４，５は、互いに連接されて周壁を形成する複数の分割片３ａ，３ｂと、該複数の分割片３ａ，３ｂの各一端にネジ部材８によって連結され、周壁の一端開口を覆う蓋を形成する分割片４と、周壁を形成する前記複数の分割片３ａ，３ｂの各他端にネジ部材８によって連結され、前記凹型金型２の凹部内に凸型金型１の凸部を位置させた際に、前記凹型金型２の凹部開口を封止する鍔部を形成する分割片５とで構成される一方、前記凹型金型２を形成する前記複数の分割片６ａ，６ｂ，７は、ネジ部材８によって互いに連結されて周壁を形成する複数の分割片６ａ，６ｂと、該複数の分割片６ａ，６ｂの各一端にネジ部材８によって連結され、周壁の一端開口を覆う蓋を形成する分割片７とで構成されているので、ガーデニングなどに使用するプランターや、食料運搬用の運送用容器のような大きな器状の樹脂成形品用の金型を、板材の曲げ加工及び切削加工のような汎用工作方法だけで製作することができる。したがって、板厚の薄い板材を用いて軽量且つ低コストの金型を提供することができる。また、板厚の薄い板材を用いれば、樹脂成形工程における予熱及び冷却時間を短縮することができる。
【００２０】
【発明の実施の形態】
以下、本発明の樹脂成形用金型に係る一実施形態を、図面を参照して説明する。尚、本実施形態は、園芸用プランターや食品運搬用容器などの角型容器を成形するための型を形成させる樹脂成形用金型を一例として示したものである。
【００２１】
本実施形態に係る樹脂成形用金型は、図１に示す如く、角型容器の内面を成形する凸型金型とされた第一金型１と、樹脂成形品の外面を成形する凹型金型とされた第二金型２とで構成されている。
【００２２】
前記第一金型１は、図１及び２に示す如く、角型容器の内周壁面を形成する第一周壁部材３ａ，３ｂと、該第一周壁部材３ａ，３ｂの一端開口部に連結され、角型容器の底部内面を形成する第一蓋部材４と、前記第一周壁部材３ａ，３ｂの他端開口部に連結され、角型容器の開口端面を形成する鍔部材５とで構成されている。
【００２３】
前記第一周壁部材３ａ，３ｂは、角型容器の正面及び背面部分の内周壁を形成する一対の第一平板周壁部材３ａ，３ａと、該第一平板周壁部材３ａ，３ｂに連結されて角型容器の両側面部分の内周壁を形成する一対の第一曲板周壁部材３ｂ，３ｂとからなっている。一方の前記第一平板周壁部材３ａ，３ａは、長方形状の平板で形成されており、各端縁部には、各端縁に沿った段部９が形成されている。そして、前記第一蓋部材４と連結される上側端縁近傍の内面には、該上側端縁に沿うように、複数のブロック体１５が一定間隔を有して形成され、該ブロック体１５には、ボルト挿通穴１６が穿孔されている。また、前記上側端縁に対向した下側端縁近傍の内面には、前記下側端縁に沿うように複数のブロック体１７が一定間隔を有して形成されており、該ブロック体１７には、ネジ穴１８が設けられている。
【００２４】
他方の第一曲板周壁部材３ｂ，３ｂの各々は、長方形状の板材の長辺方向の両端を湾曲させて角部が円弧を成したコの字形状をなしており、各端縁部には、各端縁に沿った段部１０が形成されている。そして、前記第一蓋部材４と連結される上側端縁近傍の内面には、該上側端縁に沿って複数のブロック体１９が間隔を有して形成されており、該ブロック体１９には、ボルト挿通穴１６が穿孔されている。また、前記上側端縁に対向した下側端縁近傍の内面には、該下側端縁に沿って複数のブロック体２０が間隔を有して形成され、該ブロック体２０にはネジ穴１８が形成されている。
【００２５】
前記第一蓋部材４は、厚みのある平面視略矩形状の板材を機械加工によって削り出されたものである。かかる第一蓋部材４の形状は、長方形状の平面部２１の端縁に沿って、該平面部２１と略直角を成すように延出した周壁部２２が形成され、前記平面部２１と前記周壁部２２とでなす角部、及び前記周壁部２２同士でなす角部に丸みを持たせた船底形状をなしている。換言すれば、長辺方向及び短辺方向の断面は、角部が円弧状をなした略コの字形状をなしている。また、周壁部の端縁部には、端縁に沿った段部１１が形成されている。さらに、周壁部の内面には、前記第一平板周壁部材３ａ，３ａ及び第一曲板周壁部材３ｂ，３ｂの上側端縁近傍のブロック体１５，１８と対応した位置に複数のブロック体２３が間隔を有して周方向に形成されており、該ブロック体２３には、前記第一平板周壁部材３ａ，３ａ及び第一曲板周壁部材３ｂ，３ｂのボルト挿通穴１６と同軸となるネジ穴１８が形成されている。
【００２６】
前記鍔部材５は、長方形状の板材に、前記第一平板周壁部材３ａ，３ａと第一曲板周壁部材３ｂ，３ｂの下側端縁近傍のブロック体１７，２０と対応した位置に突片２４を形成させた開口が形成された形状をなしており、前記突片２４には、前記第一平板周壁部材３ａ，３ａと第一曲板周壁部材３ｂ，３ｂのネジ穴１８と同軸となるボルト挿通穴１６が形成されている。また、前記開口周回りの近傍には、溝１２が形成されている。
【００２７】
上記構成の第一金型１を組み立てた場合、第一蓋部材４と第一平板周壁部材３ａ，３ａの連結部分は、図３（イ）に示す如く、第一蓋部材４と第一平板周壁部材３ａ，３ａとで成す外面が均一となるように、内面側を突出させて形成した、第一平板周壁部材３ａ，３ａの上側端縁部の段部９と、外面側を突出させて形成した、第一蓋部材４の周壁部２２の段部１１とが密接に係合した状態で、第一平板周壁部材３ａ，３ａのボルト挿通穴１６にボルト８を挿通し、該ボルト８が第一蓋部材４のネジ穴１８に螺嵌された状態となっている。また、第一平板周壁部材３ａ，３ａと鍔部材５の連結部分は、第一平板周壁部材３ａ，３ａの下側端縁部の段部９の突出部分を鍔部材５の溝１２に嵌合した状態で、鍔部材５のボルト挿通穴１６にボルト８を挿通し、該ボルト８が第一平板周壁部材３ａ，３ａのネジ穴１８に螺嵌された状態となっている。
【００２８】
また、第一蓋部材４と第一曲板周壁部材３ｂ，３ｂの連結部分は、図３（ロ）に示す如く、第一蓋部材４と第一平板周壁部材３ａ，３ａとで成す外面が均一となるように、内面側を突出させて形成した、第一曲板周壁部材３ｂ，３ｂの上側端縁部の段部１０と、外面側を突出させて形成した、第一蓋部材４の周壁部２２の段部１１とが密接に係合した状態で、第一曲板周壁部材３ｂ，３ｂのボルト挿通穴１６にボルト８を挿通し、該ボルト８が第一蓋部材４のネジ穴１８に螺嵌された状態となっている。また、第一曲板周壁部材３ｂ，３ｂと鍔部材５の連結部分は、第一曲板周壁部材３ｂ，３ｂの下側端縁部の段部１０の突出部分を鍔部材５の溝１２に嵌合した状態で、鍔部材５のボルト挿通穴１６にボルト８を挿通し、該ボルト８が第一曲板周壁部材３ａ，３ａのネジ穴１８に螺嵌された状態となっている。したがって、図３（ハ）に示す如く、第一平板周壁部材３ａ，３ａと第一曲板周壁部材３ｂ，３ｂとの連結部分は、外面が均一となるように、内面側を突出させて形成した、第一平板周壁部材３ａ，３ａの両側端部の段部９と、外面側を突出させて形成した、第一曲板周壁部材３ｂ，３ｂの両側端部の段部１０とを係合させたのみの状態となっている。
【００２９】
一方、前記第二金型２は、図１及び４に示す如く、角型容器の外周壁面を形成する第二周壁部材６ａ，６ｂと、該第二周壁部材６ａ，６ｂに連結されて角型容器の底部外面を成形する第二蓋部材７とで構成されている。
【００３０】
前記第二周壁部材６ａ，６ｂは、角型容器の正面及び背面部分の外周壁を形成する一対の第二平板周壁部材６ａ，６ａと、該第二平板周壁部材６ａ，６ｂに連結されて角型容器の両側面部分の外周壁を形成する一対の第二曲板周壁部材６ｂ，６ｂとからなっている。
【００３１】
前記第二平板周壁部材６ａ，６ａは、長方形状の平板で形成されており、長手方向の両側端縁部には、夫々の端縁に沿った段部１３が形成されている。そして、前記第二蓋部材７と連結される上側端縁近傍の外面には、該上側端縁からやや突出するように、複数のブロック体２５が一定間隔を有して形成され、該ブロック体２５には、ネジ穴１８が形成されている。また、前記上側端縁に対向した下側端縁には、成形装置（図示せず）に取付けるためのフランジ２６が、第二平板周壁部材６ａ，６ａと略直角を成し、かつ外側に延出するように設けられている。そして、両側端縁近傍の外面には、該端縁に沿って複数のブロック体２７が間隔を有して形成されており、該ブロック体２７には、ネジ穴１８が形成されている。
【００３２】
第二曲板周壁部材６ｂ，６ｂの各々は、長方形状の板材の長辺方向の両端を湾曲させて角部が円弧を成したコの字形状をなしており、長手方向の両側端縁部には、各々の端縁に沿って段部１４が形成されている。そして、前記第二蓋部材７と連結される上側端縁近傍の内面には、前記第二平板周壁部材６ａ，６ａと同様に、複数のブロック体２８が間隔を有し、かつ上側端縁からやや突出して形成されており、該ブロック体２８には、ネジ穴１８が形成されている。また、前記上側端縁に対向した下側端縁近傍の外面には、成形装置（図示せず）に取付けるためのフランジ２９が、第二曲板周壁部材６ｂ，６ｂと略直角を成し、かつ外側に延出するように設けられている。そして、両側端縁近傍の外面には、前記第二平板周壁部材６ａ，６ａの両側端縁近傍のブロック体２７の位置と対応するように複数のブロック体３０が間隔を有して形成されており、該ブロック体３０には、前記第二平板周壁部材６ａ，６ａのブロック体２７のネジ穴１８と同軸となるボルト挿通穴１６が穿孔されている。
【００３３】
前記第二蓋部材７は、略長方形状の板材で形成されており、該板材の外周回りには、前記第二平板周壁部材６ａ，６ａ及び第二曲板周壁部材６ｂ，６ｂの上側端縁近傍のブロック体２５，２８と対応した位置に突片３１が形成されている。かかる突片３１には、前記第二平板周壁部材６ａ，６ａ及び第二曲板周壁部材６ｂ，６ｂの上側端縁近傍のブロック体２５，２８のネジ穴１８と同軸となるボルト挿通穴１６が穿孔されている。また、長手方向の両端近傍の各々には、樹脂成形品である角型容器を押出すための押し出し手段が挿入される一対の穴３２が穿孔され、該穴３２より板材の中心側の位置に、溶融樹脂を注入するための注入穴３３が穿孔されている。
【００３４】
上記構成の第二金型２が組み立てられた場合、第二平板周壁部材６ａ，６ａと第二曲板周壁部材６ｂ，６ｂとの連結部分は、図５（イ）に示す如く、第二金型２の内面が均一となるように、外面側を突出させて形成した、第二平板周壁部材６ａ，６ａの両側端部の段部１３と、内面側を突出させて形成した、第二曲板周壁部材６ｂ，６ｂの両側端部の段部１４とを係合させた状態で、第二曲板周壁部材６ｂ，６ｂのボルト挿通用穴１６にボルト８を挿通し、該ボルト８が第二平板周壁部材６ａ，６ａのネジ穴１８に螺嵌された状態となっている。また、第二平板周壁部材６ａ，６ａと、第二蓋部材７との連結部分は、図５（ロ）に示す如く、第二平板周壁部材６ａ，６ａのブロック体２５に第二蓋部材７の突片３１を当接させた状態で、第二蓋部材７の突片３１のボルト挿通用穴１６にボルト８を挿通し、該ボルト８が第二平板周壁部材６ａ，６ａのネジ穴１８と螺合された状態となっている。また、第二曲板周壁部材６ｂ，６ｂと第二蓋部材７との連結部分は、第二平板周壁部材６ａ，６ａと、第二蓋部材７との連結部分と同様の状態となっている。つまり、第二平板周壁部材６ａ，６ａ及び第二曲板周壁部材６ｂ，６ｂのブロック体２５，２８が、上側端縁からやや突出した状態で形成されているので、第二平板周壁部材６ａ，６ａ及び第二曲板周壁部材６ｂ，６ｂと、第二蓋部材７とは、微小な隙間を形成した状態で連結されている。
【００３５】
上記構成の第一金型１と第二金型２を使用して角型容器を成形する時は、第一金型１の鍔部材５で、第一金型１と第二金型２との空間を閉じるように、第二金型２の内部空間に第一金型１が位置するように配置される。そして、第一金型１及び第二金型２を予熱した後に、第二金型２に設けられた注入穴３３から溶融樹脂を第一金型１と第二金型２とで形成した空間内に注入するのである。このとき、空間内の気体が、第二周壁部材６である第二平板周壁部材６ａ，６ａ及び第二曲板周壁部材６ｂ，６ｂと第二蓋部材７とで形成した隙間から放出され、溶融した樹脂は、空間内に円滑に流れ込むのである。つまり、溶融樹脂で空間内部の空気を押し出しているのである。その後、第一金型１及び第二金型２を冷却することにより、溶融樹脂が固化し、角型容器が成形されるのである。そして、第二金型１と第二金型２とを離間させて成形された角型容器を取り出す。角型容器が第二金型２から外れなかったときは、第二蓋部材７の穴３２から押出し手段が延出して、角型容器が第二金型２から取り外される。これで一連の樹脂成形品である角型容器の成形工程終了する。
【００３６】
以上のように、木型の製作工程が必要なく、削り出し、板材の曲げなどの汎用工作機械で行える加工のみで金型を製作することが可能となり、金型の製造コストを安くすることが可能となった。
【００３７】
また、樹脂成形用金型が、板材を曲げ加工又は厚みのある板材を削り出したものによって構成されているので、鋳造の様に湯の流れなどを考慮する必要がなく、各部材の厚みを薄くすることができ、この材料の板厚を薄くしたことで、金型内部への吸熱及び金型外部への放熱がしやすくなり、樹脂成形工程における予熱及び冷却時間を短縮することができる。よって、樹脂成形品の製造時間を短縮して、樹脂成形品の製造コストを下げることができる。
【００３８】
さらに、複数の部材を連結させて、第一金型１及び第二金型２を成形させるので、金型設計時に、分割する場所を考慮すれば、樹脂成形に影響を与えることが少ない適当な場所に隙間を形成させることが可能となり、金型内の気体を効率良く抜くことができ、溶融樹脂を金型内に容易に充填することができる。
【００３９】
なお、本実施形態において、凹型金型とされた第一金型１を形成する複数の分割片として、第一周壁部材３ａ，３ｂ、第一蓋部材４及び第一鍔部材５とされ、凸型金型とされた第二金型２を形成する複数の分割片として第二周壁部材６ａ，６ｂ及び第二蓋部材７とされたが、各分割片の形状及び数量は、最終製品の形状に応じて種々変更可能である。従って、第一金型１及び第二金型２は、角型容器を成形するものに限定されるものではなく、例えば、筒状の容器であってもよい。
【００４０】
また、段部は、板材の端部の片面側を突出したものに限定されるものではなく、例えば、連結される一方の部材の端面に溝を形成し、他方の部材に突部を形成させて、溝部に突部を嵌挿させたものであってもよく、溶融樹脂が連結部分から漏れないように連結部材同士が密接な状態となるものであればよい。
【００４１】
また、ボルト挿通穴１６又はネジ穴１８が設けられたブロック体１５，１７，…は、ブロック状に限定されるものではなく、金型の形状に応じたものを設ければよい。そして、ブロック体１５，１７，…は、切削加工によって削り出されたものに限定されるものではなく、別体のブロック体を各部材に溶着するものであってもよい。また、ブロック体１５，１７，…の数及び間隔は、金型の大きさや強度に応じで種々変更可能である。
【００４２】
さらに、第一蓋部材４及び鍔部材５のボルト挿通穴１６は、突片２４，３１に形成されるものに限定されるものではない。すなわち、ボルト挿通用穴１６を穿孔できる部位が形成されていればよいのである。
【００４３】
また、本発明に係る第一金型１及び第二金型２は、溶融した樹脂の成形にのみ使用されるものではなく、例えば、発砲ウレタンのような二液型の樹脂であってもよい。すなわち、第一金型１と第二金型２によって形成した空間内に流れ込むことが出来る流動性を有する樹脂又は樹脂の原料などであればよい。
【００４４】
【発明の効果】
以上の如く、本発明の効果として、複数の分割片で一つの金型を形成するので、各分割片に応じた必要最小限の強度を有する板材を選択することができるとともに、該板材を最終製品に応じた形状に機械加工すれば、必要最小限の肉厚の金型を形成することができ、強度を維持したまま樹脂成形用金型の軽量化が図れる。また、これにより金型内部への吸熱時間及び金型内部から外部への放熱時間が短くなり、吸樹脂成形工程に必要とされる予熱及び冷却時間を短縮することができる。したがって、樹脂成形品の製造時間を短縮することができる。
【００４５】
また、木型の製作を必要としないため、金型の製作工数を減らすことが出来、金型を低コストで製造することができる。
【００４６】
また、樹脂成形工程に悪影響を及ぼしにくい場所で金型を分割して分割片を形成させれば、その分割部分に金型内の気体を抜く隙間を形成することができる。これにより、かかる隙間から金型内の気体を容易に外部に放出することができ、溶融樹脂を円滑に充填することができる。
【図面の簡単な説明】
【図１】本発明の一実施形態に係る樹脂成形用金型の全体斜視図。
【図２】本発明の一実施形態に係る樹脂成形用金型の下型の分解斜視図。
【図３】本発明の一実施形態に係る樹脂成形用金型の下型の部分断面図（（イ）は、図１の断面Ａ−Ａ、（ロ）は、図１の断面Ｂ−Ｂ、（ハ）は、図１の断面Ｃ−Ｃ）。
【図４】本発明の一実施形態に係る樹脂成形用金型の上型の分解斜視図。
【図５】本発明の一実施形態に係る樹脂成形用金型の上型の部分断面図。（（イ）は、図１の断面Ｄ−Ｄ、（ロ）は、図１の断面Ｅ−Ｅ）。
【図６】従来の樹脂成形用金型の斜視図。
【符号の説明】
１…第一金型（凸型金型）、２…第二金型（凹型金型）、３ａ，３ｂ…第一周壁部材（３ａ…第一平板周壁部材、３ｂ…第一曲板周壁部材）、４…第一蓋部材、５…鍔部材、６ａ，６ｂ…第二周壁部材（６ａ…第二平板周壁部材、６ｂ…第二曲板周壁部材）、７…第二蓋部材、８…ネジ部材、９，１０，１１，１３，１４…段部、１２…溝、１５，１７，１９，２０，２３，２５，２７，２８，３０…ブロック体、１６…ボルト挿通穴、１８…ネジ穴、２１…平面部、２２…周壁部、２４，３１…突片、２６，２９…フランジ、３２…穴、３３…注入穴[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin mold for manufacturing a resin molded product.
[0002]
[Prior art]
Conventionally, resin molded products are produced by a method using a mold such as an injection molding method. As an example of such a mold, there is one constituted by a convex mold 50 and a concave mold 51 as shown in FIG. The convex mold 50 and the concave mold 51 have a space equivalent to the shape of the final product (resin molded product) by positioning the convex part of the convex mold 50 in the concave part of the concave mold 51. Is supposed to form.
[0003]
When a resin molded product is manufactured using the convex mold 50 and the concave mold 51, the convex mold 50 and the concave mold 51 are first preheated, and then the convex mold 50 and the concave mold 51 are formed. Pour the resin into the space. Then, it is left until the temperature of the convex mold 50 and the concave mold 51 is lowered so that the resin in contact with the space forming surfaces of the convex mold 50 and the concave mold 51 is solidified. After the temperatures of the convex mold 50 and the concave mold 51 are lowered, the concave mold 51 is separated from the convex mold 50 and the resin molded product is taken out. A resin molded product is manufactured by such a series of operations.
[0004]
The mold used in this way is generally manufactured by casting. There are various casting methods such as sand mold casting and die casting. However, since the mold does not require mass production, it is often manufactured by a sand mold casting method in which molten metal is poured into a sand mold to form a casting.
[0005]
When manufacturing a metal mold by this sand mold casting method, first, a wooden mold having a shape substantially equivalent to a mold corresponding to the shape of the final product (resin molded product) is created. Since this wooden mold is the basis of the mold used to manufacture the product, the molten metal, that is, hot water, is not removed from the finished mold so that defects such as chipping do not occur. It is created in consideration of flowing into Based on the wooden mold created in this way, the foundry sand is pressed and solidified to form a sand mold, and the molten metal is poured into the sand mold. Thereafter, the molten metal in the sand mold is left as it is, that is, the temperature of the molten metal is lowered so that the molten metal is solidified. What is solidified through such a process is a semi-finished product of a casting mold.
[0006]
After that, the semi-finished product is subjected to deburring and surface processing to obtain the accuracy required for the mold, and it is also used for air venting to smoothly fill the mold with resin. A slit (not shown) is applied to obtain a finished product.
[0007]
[Problems to be solved by the invention]
However, as described above, the mold manufactured by the above method is made in consideration of the fluidity of hot water, so that it becomes thicker than necessary. In particular, since the corners of the mold are very thick, the mold itself is a heavy object. As a result, it was necessary to increase the strength of equipment such as an injection molding machine that supports the mold.
[0008]
In addition, since the thickness of the mold is large, it takes a long time to preheat and cool the mold in the resin molding process, and it takes a long time to manufacture one resin molded product, which deteriorates productivity. There was a case. Furthermore, since the wall thickness is more than necessary, the manufacturing cost of the mold was high.
[0010]
The present invention aims to lighter while maintaining the minimum required strength can be manufactured at low cost, to provide a resin mold that can shorten the manufacturing time of the resin molded product And
[0011]
[Means for Solving the Problems]
In order to solve the above Symbol challenges, the resin molding die according to the present invention, the final product shape and substantially the same shape space in combination with the first mold 1 and a second mold 2 is formed, the In a resin mold for injecting molten resin into a shape space to produce a resin molded product, the first mold 1 is a convex mold formed by connecting a plurality of divided pieces 3a, 3b, 4, 5 The second mold 2 is a concave mold formed by connecting a plurality of divided pieces 6 a, 6 b, and 7, and the convex mold 1 is placed in the concave portion of the concave mold 2. A convex space is formed to form a shape space substantially equivalent to the shape of the final product, and the plurality of divided pieces 3a, 3b, 4, 5 forming the convex mold 1 are connected to each other to form a peripheral wall. A plurality of divided pieces 3a and 3b forming a plurality of divided pieces 3a and 3b are connected to one end of the plurality of divided pieces 3a and 3b by screw members 8, A split piece 4 that forms a lid that covers one end opening, and a screw member 8 that is connected to the other ends of the plurality of split pieces 3a and 3b that form a peripheral wall, and a convex mold in the concave part of the concave mold 2 The plurality of divisions that form the concave mold 2 while being configured with the split piece 5 that forms a flange portion that seals the concave opening of the concave mold 2 when the one convex portion is positioned. The pieces 6a, 6b, and 7 are connected to each other by a screw member 8 to form a peripheral wall, and are connected to each end of the plurality of split pieces 6a and 6b by a screw member 8, It is comprised by the division piece 7 which forms the lid | cover which covers one end opening.
[0012]
The resin molding die having the above-described structure is obtained by machining a plurality of divided pieces 3a, 3b, 4, 5, 6a, 6b, and 7 on a thin plate material having a necessary minimum strength and the like. If used, a lightweight mold can be produced. Moreover, since each member can be made thin, preheating and cooling time in the resin molding process can be shortened. Furthermore, if a material with high thermal conductivity such as an aluminum alloy is used for the plate material, the preheating and cooling time can be further shortened. Therefore, the resin molding time can be shortened.
[0013]
In addition, unlike the manufacturing of a mold by casting, the pre-process up to machining, that is, the manufacturing of a wooden mold and the casting operation is not required, so that the number of manufacturing steps of the mold is reduced. Furthermore, since the mold can be manufactured only by general machining, the resin molding mold can be manufactured at low cost.
[0014]
The first mold 1 is a convex mold formed by connecting the plurality of divided pieces 3a, 3b, 4 and 5, and the second mold 2 is formed of the plurality of divided pieces 6a. , 6b, 7 are connected to each other, and a convex space of the convex mold 1 is positioned in a concave portion of the concave mold 2 to form a shape space substantially equivalent to the shape of the final product. that since, by molding the inner surface of the vessel-shaped resin molded article by the convex mold 1 of the convex portion, in the recess of the concave mold 2 vessel like the outer surface of the resin molded article can be molded vessel-like It can be set as a mold for resin molding.
[0015]
The resin molding die configured as described above is capable of bending and cutting each of the plurality of divided pieces 3a, 3b, 4, 5, 6a, 6b, and 7 with high accuracy. It can be thin and light weight.
[0016]
Further, the plurality of divided pieces 3a, 3b, 4 and 5 forming the convex mold 1 are connected to each other to form a plurality of divided pieces 3a and 3b which form a peripheral wall, and the plurality of divided pieces 3a and 3b. Are connected by screw members 8 to each one end of each of the divided pieces 4 forming a lid covering one end opening of the peripheral wall, and connected to the other ends of the plurality of divided pieces 3a and 3b forming the peripheral wall by screw members 8. One of the divided pieces 5 that forms a flange that seals the concave opening of the concave mold 2 when the convex part of the convex mold 1 is positioned in the concave part of the concave mold 2. The plurality of divided pieces 6a, 6b, 7 forming the concave mold 2 are connected to each other by a screw member 8 to form a plurality of divided pieces 6a, 6b and a plurality of divided pieces 6a, 6b. A lid that covers one end opening of the peripheral wall is formed by being connected to each end by a screw member 8. Because it is composed of a divided piece 7 that, planters and used like gardening, a large bowl-shaped mold for resin molded articles such as shipping containers for food transportation, the sheet bending and cutting It can be manufactured only by the general-purpose work method. Therefore, a lightweight and low-cost mold can be provided by using a thin plate material. Moreover, if a board | plate material with a thin board | plate thickness is used, the preheating and cooling time in a resin molding process can be shortened.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment according to a resin molding die of the present invention will be described with reference to the drawings. In the present embodiment, a resin molding die for forming a mold for molding a square container such as a horticultural planter or a food transport container is shown as an example.
[0021]
As shown in FIG. 1, the mold for resin molding according to the present embodiment includes a first mold 1 which is a convex mold for molding the inner surface of a rectangular container, and a concave mold for molding the outer surface of a resin molded product. It is comprised with the 2nd metal mold | die 2 made into the type | mold.
[0022]
As shown in FIGS. 1 and 2, the first mold 1 includes first peripheral wall members 3a and 3b that form the inner peripheral wall surface of the rectangular container, and one end opening of the first peripheral wall members 3a and 3b. A first lid member 4 connected to form the bottom inner surface of the rectangular container, and a flange member 5 connected to the other end opening of the first peripheral wall members 3a and 3b to form the open end surface of the rectangular container; It consists of
[0023]
Said 1st surrounding wall member 3a, 3b is connected with a pair of 1st flat plate peripheral wall member 3a, 3a which forms the internal peripheral wall of the front and back part of a square container, and this 1st flat plate peripheral wall member 3a, 3b. It consists of a pair of first curved plate peripheral wall members 3b, 3b that form the inner peripheral walls of both side portions of the rectangular container. One said 1st flat plate surrounding wall member 3a, 3a is formed in the rectangular-shaped flat plate, and the step part 9 along each edge is formed in each edge. A plurality of block bodies 15 are formed on the inner surface in the vicinity of the upper end edge connected to the first lid member 4 so as to extend along the upper end edge. The bolt insertion hole 16 is perforated. A plurality of block bodies 17 are formed at regular intervals along the lower edge on the inner surface in the vicinity of the lower edge opposite to the upper edge. Is provided with a screw hole 18.
[0024]
Each of the other first curved plate peripheral wall members 3b, 3b is formed in a U shape in which both ends in the long side direction of the rectangular plate material are curved and the corner portion forms an arc. Are formed with stepped portions 10 along each edge. A plurality of block bodies 19 are formed at intervals along the upper edge on the inner surface near the upper edge connected to the first lid member 4. The bolt insertion hole 16 is drilled. A plurality of block bodies 20 are formed at intervals along the lower edge on the inner surface in the vicinity of the lower edge facing the upper edge, and screw holes 18 are formed in the block body 20. Is formed.
[0025]
The first lid member 4 is formed by machining a thick plate material having a substantially rectangular shape in plan view. The shape of the first lid member 4 is such that a peripheral wall portion 22 extending so as to form a substantially right angle with the flat surface portion 21 is formed along the edge of the rectangular flat surface portion 21, and The corner portion formed with the peripheral wall portion 22 and the corner portion formed between the peripheral wall portions 22 are rounded. In other words, the cross section in the long side direction and the short side direction has a substantially U-shape in which the corners are arcuate. Moreover, the step part 11 along an edge is formed in the edge part of a surrounding wall part. Further, on the inner surface of the peripheral wall portion, there are a plurality of block bodies 23 at positions corresponding to the block bodies 15 and 18 near the upper edge of the first flat plate peripheral wall members 3a and 3a and the first curved plate peripheral wall members 3b and 3b. The block body 23 is formed in a circumferential direction with an interval, and the block body 23 has screw holes that are coaxial with the bolt insertion holes 16 of the first flat plate peripheral wall members 3a and 3a and the first curved plate peripheral wall members 3b and 3b. 18 is formed.
[0026]
The eaves member 5 has a rectangular plate and a projecting piece at a position corresponding to the first flat plate peripheral wall members 3a, 3a and the block bodies 17, 20 near the lower edge of the first curved plate peripheral wall members 3b, 3b. The projecting piece 24 is coaxial with the screw holes 18 of the first flat plate peripheral wall members 3a and 3a and the first curved plate peripheral wall members 3b and 3b. Bolt insertion holes 16 are formed. Further, a groove 12 is formed in the vicinity of the periphery of the opening.
[0027]
When the first mold 1 having the above structure is assembled, the connecting portion between the first lid member 4 and the first flat plate peripheral wall members 3a and 3a is as shown in FIG. A step 9 on the upper edge of the first flat plate peripheral wall members 3a, 3a and the outer surface side are protruded so that the outer surface formed by the peripheral wall members 3a, 3a is uniform. In a state where the formed step portion 11 of the peripheral wall portion 22 of the first lid member 4 is closely engaged, the bolt 8 is inserted into the bolt insertion hole 16 of the first flat plate peripheral wall members 3a, 3a. The first lid member 4 is screwed into the screw hole 18. The connecting portion between the first flat plate peripheral wall members 3a and 3a and the flange member 5 is such that the protruding portion of the step portion 9 at the lower edge of the first flat plate peripheral wall members 3a and 3a is fitted into the groove 12 of the hook member 5. In this state, the bolt 8 is inserted into the bolt insertion hole 16 of the flange member 5, and the bolt 8 is screwed into the screw hole 18 of the first flat plate peripheral wall members 3a and 3a.
[0028]
Further, the connecting portion between the first lid member 4 and the first curved plate peripheral wall members 3b, 3b has an outer surface formed by the first lid member 4 and the first flat plate peripheral wall members 3a, 3a as shown in FIG. Steps 10 of the upper edge portions of the first curved plate peripheral wall members 3b, 3b formed by protruding the inner surface side so as to be uniform, and the first lid member 4 formed by protruding the outer surface side The bolt 8 is inserted into the bolt insertion hole 16 of the first curved plate peripheral wall members 3b, 3b in a state where the step portion 11 of the peripheral wall portion 22 is closely engaged, and the bolt 8 is screwed into the screw hole of the first lid member 4. 18 is screwed. Further, the connecting portion between the first curved plate peripheral wall members 3 b and 3 b and the flange member 5 is formed by using the protruding portion of the step portion 10 at the lower edge of the first curved plate peripheral wall members 3 b and 3 b as the groove 12 of the flange member 5. In the engaged state, the bolt 8 is inserted into the bolt insertion hole 16 of the flange member 5, and the bolt 8 is screwed into the screw hole 18 of the first curved plate peripheral wall members 3a, 3a. Therefore, as shown in FIG. 3C, the connecting portions of the first flat plate peripheral wall members 3a and 3a and the first curved plate peripheral wall members 3b and 3b are formed by projecting the inner surface side so that the outer surfaces are uniform. The step portions 9 at both end portions of the first flat plate peripheral wall members 3a, 3a are engaged with the step portions 10 formed at the both end portions of the first curved plate peripheral wall members 3b, 3b. It is in a state of being let alone.
[0029]
On the other hand, the second mold 2 is connected to the second peripheral wall members 6a and 6b forming the outer peripheral wall surface of the rectangular container and the second peripheral wall members 6a and 6b as shown in FIGS. It is comprised with the 2nd cover member 7 which shape | molds the bottom part outer surface of a container.
[0030]
The second peripheral wall members 6a and 6b are connected to the pair of second flat plate peripheral wall members 6a and 6a that form the outer peripheral walls of the front and back portions of the square container, and are connected to the second flat plate peripheral wall members 6a and 6b. It consists of a pair of second curved plate peripheral wall members 6b, 6b that form the outer peripheral walls of both side surface portions of the mold container.
[0031]
The said 2nd flat plate surrounding wall member 6a, 6a is formed in the rectangular-shaped flat plate, and the step part 13 along each edge is formed in the both-sides edge part of a longitudinal direction. A plurality of block bodies 25 are formed on the outer surface in the vicinity of the upper end edge connected to the second lid member 7 so as to slightly protrude from the upper end edge, with a predetermined interval. A screw hole 18 is formed in 25. Further, a flange 26 for attaching to a molding device (not shown) is formed on the lower edge opposite to the upper edge, substantially at right angles to the second flat plate peripheral wall members 6a and 6a, and extends outward. It is provided so that it can be put out. A plurality of block bodies 27 are formed at intervals on the outer surface in the vicinity of both side edges along the edges, and screw holes 18 are formed in the block bodies 27.
[0032]
Each of the second curved plate peripheral wall members 6b, 6b is formed in a U shape in which both ends in the long side direction of the rectangular plate material are curved and the corner portion forms an arc, and both side edge portions in the longitudinal direction. The step 14 is formed along each edge. And, like the second flat plate peripheral wall members 6a, 6a, a plurality of block bodies 28 are spaced on the inner surface in the vicinity of the upper edge connected to the second lid member 7, and from the upper edge. The block body 28 has a screw hole 18 formed in a slightly protruding manner. Further, on the outer surface in the vicinity of the lower edge opposite to the upper edge, a flange 29 for attachment to a molding device (not shown) forms a substantially right angle with the second curved plate peripheral wall members 6b and 6b, And it is provided so that it may extend outside. A plurality of block bodies 30 are formed at intervals on the outer surface in the vicinity of both side edges so as to correspond to the positions of the block bodies 27 in the vicinity of both side edges of the second flat plate peripheral wall members 6a, 6a. The block body 30 has a bolt insertion hole 16 that is coaxial with the screw hole 18 of the block body 27 of the second flat plate peripheral wall members 6a and 6a.
[0033]
The second lid member 7 is formed of a substantially rectangular plate material, and the upper edge of the second flat plate peripheral wall members 6a and 6a and the second curved plate peripheral wall members 6b and 6b around the outer periphery of the plate material. A projecting piece 31 is formed at a position corresponding to the block bodies 25 and 28 in the vicinity. The projecting piece 31 has bolt insertion holes 16 that are coaxial with the screw holes 18 of the block bodies 25 and 28 in the vicinity of the upper edges of the second flat plate peripheral wall members 6a and 6a and the second curved plate peripheral wall members 6b and 6b. Perforated. A pair of holes 32 into which extrusion means for extruding a rectangular container, which is a resin molded product, are inserted are drilled in each of the vicinity of both ends in the longitudinal direction. An injection hole 33 for injecting molten resin is formed.
[0034]
When the second mold 2 having the above structure is assembled, the connecting portion between the second flat plate peripheral wall members 6a and 6a and the second curved plate peripheral wall members 6b and 6b is as shown in FIG. A second curve formed by projecting the outer surface side so that the inner surface of the mold 2 is uniform, and by forming the step portions 13 at both end portions of the second flat plate peripheral wall members 6a, 6a, and projecting the inner surface side. The bolts 8 are inserted into the bolt insertion holes 16 of the second curved plate peripheral wall members 6b, 6b in a state where the stepped portions 14 on both side ends of the plate peripheral wall members 6b, 6b are engaged. The two flat plate peripheral wall members 6a, 6a are screwed into the screw holes 18. Further, the connecting portion between the second flat plate peripheral wall members 6a and 6a and the second lid member 7 is connected to the block body 25 of the second flat plate peripheral wall members 6a and 6a as shown in FIG. With the protruding pieces 31 in contact with each other, the bolts 8 are inserted into the bolt insertion holes 16 of the protruding pieces 31 of the second lid member 7, and the bolts 8 are screw holes 18 of the second flat plate peripheral wall members 6a and 6a. And are in a state of being screwed together. Further, the connecting portion between the second curved plate peripheral wall members 6 b and 6 b and the second lid member 7 is in the same state as the connecting portion between the second flat plate peripheral wall members 6 a and 6 a and the second lid member 7. . That is, since the second flat plate peripheral wall members 6a and 6a and the block bodies 25 and 28 of the second curved plate peripheral wall members 6b and 6b are formed so as to slightly protrude from the upper edge, the second flat plate peripheral wall member 6a and 6a, the 2nd curved plate surrounding wall members 6b and 6b, and the 2nd cover member 7 are connected in the state which formed the micro clearance gap.
[0035]
When forming the rectangular container using the first mold 1 and the second mold 2 having the above-described configuration, the first mold 1 and the second mold 2 are formed by the flange member 5 of the first mold 1. It arrange | positions so that the 1st metal mold | die 1 may be located in the internal space of the 2nd metal mold | die 2 so that this space may be closed. And after preheating the 1st metal mold 1 and the 2nd metal mold 2, the space which formed molten resin with the 1st metal mold 1 and the 2nd metal mold 2 from the injection hole 33 provided in the 2nd metal mold 2 It is injected into the inside. At this time, the gas in the space is discharged from the gap formed by the second flat plate peripheral wall members 6a and 6a and the second curved plate peripheral wall members 6b and 6b, which are the second peripheral wall member 6, and the second lid member 7, and melted. The resin that has flowed smoothly into the space. That is, the air inside the space is pushed out by the molten resin. Thereafter, the first mold 1 and the second mold 2 are cooled, so that the molten resin is solidified and a square container is formed. And the square container shape | molded by separating the 2nd metal mold | die 1 and the 2nd metal mold | die 2 is taken out. When the square container does not come off from the second mold 2, the pushing means extends from the hole 32 of the second lid member 7, and the square container is removed from the second mold 2. This completes the molding process of a rectangular container which is a series of resin molded products.
[0036]
As described above, there is no need for a wooden mold manufacturing process, and it is possible to manufacture a mold only by machining that can be performed with general-purpose machine tools such as cutting and bending of a plate material, thereby reducing the manufacturing cost of the mold. It has become possible.
[0037]
In addition, since the mold for resin molding is configured by bending a plate material or by cutting out a thick plate material, it is not necessary to consider the flow of hot water as in casting, and the thickness of each member is reduced. By reducing the thickness of this material, heat absorption into the mold and heat dissipation to the outside of the mold can be facilitated, and preheating and cooling time in the resin molding process can be shortened. Therefore, the manufacturing time of the resin molded product can be shortened and the manufacturing cost of the resin molded product can be reduced.
[0038]
Further, since the first mold 1 and the second mold 2 are formed by connecting a plurality of members, it is appropriate to consider the place to be divided when designing the mold. It is possible to form a gap at a place, the gas in the mold can be efficiently removed, and the molten resin can be easily filled in the mold.
[0039]
In the present embodiment, the first peripheral wall members 3a and 3b, the first lid member 4 and the first flange member 5 are used as the plurality of divided pieces forming the first mold 1 which is a concave mold. The second peripheral wall members 6a and 6b and the second lid member 7 are formed as a plurality of divided pieces forming the second mold 2 which is a convex mold, but the shape and quantity of each divided piece are the same as those of the final product. Various changes can be made according to the shape. Therefore, the 1st metal mold | die 1 and the 2nd metal mold | die 2 are not limited to what shape | molds a square container, For example, a cylindrical container may be sufficient.
[0040]
Further, the stepped portion is not limited to the one protruding from one side of the end of the plate material. For example, a groove is formed on the end surface of one member to be connected, and a protrusion is formed on the other member. In addition, the protrusion may be inserted into the groove, and any connecting member may be used as long as the molten resin does not leak from the connecting portion.
[0041]
Moreover, the block bodies 15, 17,... Provided with the bolt insertion holes 16 or the screw holes 18 are not limited to the block shape, and may be provided according to the shape of the mold. And the block bodies 15, 17, ... are not limited to what was cut out by cutting, You may weld a separate block body to each member. Further, the number and interval of the block bodies 15, 17,... Can be variously changed according to the size and strength of the mold.
[0042]
Further, the bolt insertion holes 16 of the first lid member 4 and the flange member 5 are not limited to those formed in the projecting pieces 24 and 31. That is, it suffices if a portion where the bolt insertion hole 16 can be drilled is formed.
[0043]
The first mold 1 and the second mold 2 according to the present invention are not only used for molding a molten resin, but may be a two-component resin such as foamed urethane, for example. . That is, any resin or resin raw material having fluidity that can flow into the space formed by the first mold 1 and the second mold 2 may be used.
[0044]
【The invention's effect】
As described above, as one of the effects of the present invention, a single mold is formed by a plurality of divided pieces, so that it is possible to select a plate material having a necessary minimum strength corresponding to each divided piece, and to finalize the plate material. By machining into a shape according to the product, it is possible to form a minimum-thick mold, and to reduce the weight of the resin mold while maintaining the strength. Moreover, the heat absorption time to the inside of a metal mold | die and the heat dissipation time from the inside of a metal mold | die to the outside become short, and the preheating and cooling time which are required for a resin absorption molding process can be shortened. Therefore, the manufacturing time of the resin molded product can be shortened.
[0045]
Further, since it is not necessary to manufacture a wooden mold, the number of manufacturing steps of the mold can be reduced, and the mold can be manufactured at a low cost.
[0046]
Moreover, if the mold is divided at a place where the resin molding process is not adversely affected and the divided pieces are formed, a gap for venting the gas in the mold can be formed in the divided portion. Thereby, the gas in a metal mold | die can be easily discharge | released outside from this clearance gap, and it can be filled with molten resin smoothly.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a resin molding die according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of a lower mold of a resin mold according to an embodiment of the present invention.
3 is a partial cross-sectional view of a lower mold of a resin molding die according to an embodiment of the present invention ((A) is a cross-section AA in FIG. 1 and (B) is a cross-section BB in FIG. 1). (C) is a cross-section CC of FIG. 1).
FIG. 4 is an exploded perspective view of an upper mold of a resin molding die according to an embodiment of the present invention.
FIG. 5 is a partial cross-sectional view of an upper mold of a resin molding die according to an embodiment of the present invention. ((A) is a section DD in FIG. 1, (B) is a section EE in FIG. 1).
FIG. 6 is a perspective view of a conventional resin molding die.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... 1st metal mold | die (convex metal mold | die), 2 ... 2nd metal mold | die (concave metal mold | die), 3a, 3b ... 1st surrounding wall member (3a ... 1st flat plate surrounding wall member, 3b ... 1st curved plate surrounding wall Member), 4 ... first lid member, 5 ... claw member, 6a, 6b ... second peripheral wall member (6a ... second flat plate peripheral wall member, 6b ... second curved plate peripheral wall member), 7 ... second lid member, 8 ... Screw member, 9, 10, 11, 13, 14 ... Stepped portion, 12 ... Groove, 15, 17, 19, 20, 23, 25, 27, 28, 30 ... Block body, 16 ... Bolt insertion hole, 18 ... Screw hole, 21 ... plane part, 22 ... peripheral wall part, 24, 31 ... projecting piece, 26, 29 ... flange, 32 ... hole, 33 ... injection hole

Claims

The first mold (1) and the second mold (2) are combined to form a shape space substantially equivalent to the shape of the final product, and a molten resin is injected into the shape space to produce a resin molded product. In the resin molding die, the first die (1) is a convex die formed by connecting a plurality of divided pieces (3a, 3b, 4, 5), and the second die ( 2) is a concave mold in which a plurality of divided pieces (6a, 6b, 7) are connected, and the convex part of the convex mold (1) is positioned in the concave part of the concave mold (2). Thus, a shape space substantially equivalent to the shape of the final product is formed, and the plurality of divided pieces (3a, 3b, 4, 5) forming the convex mold (1) are connected to each other to form a peripheral wall. A plurality of divided pieces (3a, 3b) that form a plurality of divided pieces (3a, 3b) are connected to one end of each of the divided pieces (3a, 3b) by screw members (8). A recessed piece (4) that forms a lid covering one end opening, and a screw member (8) that is connected to each other end of the plurality of divided pieces (3a, 3b) that form a peripheral wall. When the convex part of the convex mold (1) is positioned in the concave part of the concave mold (2), it is constituted by a split piece (5) that forms a flange part that seals the concave part opening of the concave mold (2) On the other hand, the plurality of divided pieces (6a, 6b, 7) forming the concave mold (2) are connected to each other by a screw member (8) to form a plurality of divided pieces (6a, 6b) forming a peripheral wall. The plurality of divided pieces (6a, 6b) are connected to each one end by a screw member (8), and are formed of divided pieces (7) that form a lid that covers one end opening of the peripheral wall. Mold for resin molding.