JP4419117B2 - Lubricant supply method for pellet molding - Google Patents

Lubricant supply method for pellet molding Download PDF

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JP4419117B2
JP4419117B2 JP2003146172A JP2003146172A JP4419117B2 JP 4419117 B2 JP4419117 B2 JP 4419117B2 JP 2003146172 A JP2003146172 A JP 2003146172A JP 2003146172 A JP2003146172 A JP 2003146172A JP 4419117 B2 JP4419117 B2 JP 4419117B2
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lubricant
die
mist
valve
sprayer
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JP2004346393A (en
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進 皆川
嘉能 野上
朗 岩井
厚 西村
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Kimura Chemical Plants Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Description

【０００１】
【発明の属する技術分野】
本発明はペレット成型前のダイスに潤滑剤を供給する方法に関するものである。
【０００２】
【従来の技術】
従来、核燃料用のペレットや超硬合金チップ等のペレットの成型はダイスホルダのダイス下方に下パンチの上端が位置するようにダイスホルダを上昇停止した後、原料の粉末体をダイスホルダのダイス内に掻き込んで、下パンチの上端がダイスのほぼ中央に近づけるようにダイスホルダを降下停止した後、ダイス内に上方より上パンチを挿入、降下してダイス内の粉末体を圧縮しペレットに成型、成型後ダイス内の上パンチを上昇すると共に、下パンチの上端がダイスホルダのダイスの上端と面一となるようにダイスホルダを更に降下し、ダイス内より成型されたペレットを押し上げていた。
【０００３】
しかし、このダイス内の壁にかかるペレットの成型体の膨張力によって、ダイスホルダを押し下げる力が余分にかかり、しかもペレットがダイス内よりスムーズに押し上げられず、ダイス内で破損して所望のペレットを成型することができなかった。
【０００４】
そのために、この原料の粉末体に潤滑剤を混合して、混合体としたものをダイスホルダのダイス内に掻き込み、上述のようにペレットを成型し、ダイス内より上パンチを上昇した後、ダイスホルダを押し下げて、混合体によるペレットを成型することが開発された。
【０００５】
この混合体によるペレットによって、ダイス内の壁に混合体内の潤滑剤が接触するために、ダイスホルダを押し下げる力も余分にかからず、しかもダイス内のペレットをスムーズに上昇することができた。
【０００６】
【発明が解決しようとする課題】
ところが、この混合体によるペレットは粉末体に混合する潤滑剤の混合工程の設備が必要であり、設備コスト及び製品コストに大幅な投資を要していた。しかも、混合体に対しては多量の潤滑剤が必要である反面、成型されたペレットに対しては不純物となるため潤滑剤量の減少対策に苦慮しており、ペレット内の潤滑剤を揮発除去する工程（予備焼結工程（脱脂工程））を特に設けなければならなかった。又、混合体によるペレットでは硬度及び密度が向上できないという問題点があった。
【０００７】
そこで、本発明はこのような従来のペレットの成型が有していた課題を解決したものであって、混合工程や予備焼結工程等の設備コストの削減をはかることができると共に純度が高く、硬度及び密度の向上したペレットを成型できる一方、使用される潤滑剤を効率よく塗布でき、使用される潤滑剤の大幅な低減をはかることができる。
更に、ダイスが上昇するときに発生する吸引力によりダイス内壁に霧状潤滑剤を付着させるため、より均一に塗布することもできる。
又、霧状潤滑剤をダイス内壁に沿う旋回流若しくは上方流によって塗布するために、ダイス内壁への付着力を高めて潤滑性をより向上することもできることを目的としたペレットの成型方法及び成型に用いる潤滑剤の供給方法を提供するにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するために、本発明のペレット成型に用いる潤滑剤の供給方法の構成は、潤滑剤を霧状にする噴霧器１と、この噴霧器１からの霧状潤滑剤ｂを供給用のバルブ２を介してダイス１４上の潤滑剤カップ１０に導くと共に、外気を外気吸引バルブ２４を介して吸引する供給配管４と、ダイス１４に供給された余剰の霧状潤滑剤ｂを排出用のバルブ７を介して排出する排出配管８と、供給配管４内及び排出配管８内の霧状潤滑剤ｂを吸引する吸引器９とを備え、霧状潤滑剤ｂが潤滑剤カップ１０に到達する時点で、供給用のバルブ２と排出用のバルブ７を閉鎖し、その後、外気吸引バルブ２４を開放し、霧状潤滑剤ｂを、ダイスホルダ１５が上昇するときに発生する外気の吸引力にて潤滑剤カップ１０よりダイス１４内に引き込み、ダイス１４の内壁に自然付着若しくは強制的に塗布する構成としている。
【０００９】
また、本発明のペレット成型に用いる潤滑剤の供給方法の構成は、潤滑剤を霧状にする噴霧器１と、この噴霧器１からの霧状潤滑剤ｂをダイス１４に設置の噴射孔２３に導く供給配管４と、ダイス１４に供給された余剰の霧状潤滑剤ｂを排出する排出配管８と、供給配管４内及び排出配管８内の霧状潤滑剤ｂを吸引する吸引器９とを備え、霧状潤滑剤ｂを、ダイス１４内壁に沿う旋回流若しくは上方流によって、ダイス１４内壁に自然付着若しくは強制的に塗布する構成としている。
【００１０】
【発明の実施の形態】
以下、本発明の実施例について図に基づき説明する。
図中、図１は本発明実施例の潤滑剤のフローを示す系統図、図２は本発明実施例のダイスに潤滑剤を導入する概略説明図、図３は本発明実施例のダイスに粉末体を導入する概略説明図、図４は本発明実施例のダイスよりペレットを成型する概略説明図、図５は本発明実施例のダイスよりペレットを取り出す概略説明図、図６は本発明別実施例のダイスに潤滑剤を導入する概略説明図である。
【００１１】
ペレットＡの成型は原料の粉末体ａをダイスホルダ１５のダイス１４内に導入する前にこのダイスホルダ１５のダイス１４内にステアリン酸系の潤滑剤を付着、塗布している。このステアリン酸系の潤滑剤は図１に示すように、噴霧器１内にて空気と混合し霧状とされ、供給バルブ２を介して供給配管４を通りダイス１４へと供給される。このときバルブ５、バルブ７とを開放し、バルブ３、バルブ６とを閉鎖している。
【００１２】
この噴霧器１はタンク１８の上端を覆う上蓋１９を設け、このタンク１８内の下面に供給される潤滑剤を受け止める振動増幅板２０を設け、この振動増幅板２０の下側に振動増幅板２０を振動させるスピーカ２１を設け、タンク１８内に潤滑剤を投入する潤滑剤投入孔と、霧状となった霧状潤滑剤ｂを供給配管４へ導く潤滑剤供給孔とを設けている。この噴霧器１は潤滑剤投入孔よりタンク１８内に潤滑剤が投入されるとスピーカ２１を稼働して振動増幅板２０を振動し、振動増幅板２０上の潤滑剤を空気と混合して霧状にし潤滑剤供給孔を経て供給配管４へと供給する。
【００１３】
供給配管４からダイス１４内へ導入された霧状潤滑剤ｂがダイス１４内に到達する時点で、供給用のバルブ２と排出用のバルブ７を閉鎖し、潤滑剤カップ１０内に霧状潤滑剤ｂが充満される。その後外気吸引バルブ２４を開け、ダイスホルダ１５が上昇する時発生する吸引力にて強制的にダイス１４内に引き込まれる。
【００１４】
この吸引力よって、ダイスホルダ１５のダイス１４内壁に霧状潤滑剤ｂが付着、塗布される。このダイスホルダ１５のダイス１４内壁への塗布が完了された時点で、供給用のバルブ５と外気吸引バルブ２４と排出用のバルブ７を開放すれば、吸引器９の吸引によって潤滑剤カップ１０内及びダイスホルダ１５のダイス１４内の余剰の霧状潤滑剤ｂと供給配管４中及び排出配管８中の霧状潤滑剤ｂとを吸引器９内へ吸引、集積され、この集積された霧状潤滑剤ｂが噴霧器１内へ再循環される。
【００１５】
次に、別実施例である霧状潤滑剤の供給系路について説明する。ステアリン酸系の潤滑剤は噴霧器１のタンク１８内に投入されて空気と混合、霧状とされる。この噴霧器１で霧状とされた霧状潤滑剤ｂが供給用のバルブ２を介して供給配管４へと送られる。このときバルブ３及びバルブ５とを閉鎖し、吸引用のバルブ６を開放して吸引器９にて一旦吸引配管１２を介して供給配管４中を吸引した後に、この吸引用のバルブ６を閉鎖して供給配管４中に霧状潤滑剤ｂが充満される。
【００１６】
噴霧器１から供給された霧状潤滑剤ｂが供給配管４に到達した時点で、バルブ２を閉鎖し、バルブ５を開放し導入用のバルブ３をも開放して、圧縮空気導入管１７からの圧縮空気を供給配管４へと導き、この圧縮空気の押圧にて供給配管４中の霧状潤滑剤ｂがダイスホルダ１５のダイス１４内に強制的に充満され、ダイス１４内壁に付着、塗布される。
【００１７】
このダイスホルダ１５のダイス１４内壁への塗布が完了された時点で、導入用のバルブ３を閉鎖し、外気吸引バルブ２４、排出用のバルブ７を開放すれば、吸引器９の吸引によって潤滑剤カップ１０内の余剰の霧状潤滑剤ｂと供給配管４中の霧状潤滑剤ｂを吸引器９内へ吸引、集積され、この集積された霧状潤滑剤ｂが噴霧器１内へ再循環される。
【００１８】
このとき、図６に示すように、ダイス１４に設置の噴射孔２３より霧状潤滑剤ｂを噴射することにより、ダイスホルダ１５のダイス１４内壁に付着させ、余剰の霧状潤滑剤ｂはダイス１４上方へ流れ、その後回収される。ここで、ダイス１４の噴射孔２３の位相を変更することにより、ダイス１４内壁に発生する流線が上方向若しくは旋回流等様々な流線を設定することが可能であって、より効率的に霧状潤滑剤をダイス内壁に付着させることができる。
【００１９】
このようにして、霧状潤滑剤ｂは供給されるが、ペレットＡの成型を図２乃至図５に基づいて説明する。噴霧器１からの霧状潤滑剤ｂは潤滑剤カップ１０内に導入される。この潤滑剤カップ１０がダイスホルダ１５のダイス１４上部に移動され、ダイス１４下部に下パンチ１３の上端が位置するまでダイスホルダ１５を上昇すると、このダイスホルダ１５の移動時に発生する下方への吸引力にて、潤滑剤カップ１０内の霧状潤滑剤ｂがダイス１４内壁に付着、塗布される。塗布終了後は潤滑剤カップ１０内の余剰の霧状潤滑剤ｂは吸引器９にて吸引される。このダイスホルダ１５のダイス１４内に向かって上方より上下動する上パンチ１６はこのダイス１４より離れた上方に位置しており、下パンチ１３は固定で、ダイスホルダ１５が上下動している。（図２参照）
【００２０】
次に、潤滑剤カップ１０はダイスホルダ１５のダイス１４上方より離れ、代わりに粉末体ａを導入した粉末体カップ１１がダイス１４上部に移動されて、粉末体カップ１１内の粉末体ａを内壁に潤滑剤ｂを塗布したダイス１４内に掻き込む。このとき上パンチ１６はダイス１４より離れている。（図３参照）
【００２１】
粉末体カップ１１がダイスホルダ１５のダイス１４上方より離れると、内壁に潤滑剤ｂを塗布し、その内側に粉末体ａを掻き込んだダイス１４内に上方より上パンチ１６を下動し、更に上パンチ１６と共にダイスホルダ１５を降下して、この上パンチ１６と下パンチ１３とにてダイス１４内の粉末体ａを圧縮し、この粉末体ａによるペレットＡが成型される。（図４参照）
【００２２】
次に、上パンチ１６が上方へ移動し、ダイスホルダ１５が降下して、ペレットＡをダイス１４上面にまで押し上げる。（図５参照）
【００２３】
このように成型されたペレットＡは、ダイス１４内壁に塗布された潤滑剤ｂの影響によって、ダイス１４内を摺動しやすく、ダイスホルダ１５の降下にてスムーズにダイス１４上面に押し上げられる。
【００２４】
実験例
粉末体としてモリブテンを使用し、潤滑剤としてステアリン酸亜鉛を使用。
この潤滑剤は従来の粉末体と潤滑剤とを混合した混合体が０.２ｗｔ％の使用量に対して、０．０５ｗｔ％の使用量で、３５ｍｇとした。
この結果、
従来の混合体が ５．０２８ｇ／ｃｃ（焼結密度）、１００％（硬度）
成型されたペレットが５．０４７ｇ／ｃｃ（焼結密度）、１２５％（硬度）
従って、使用潤滑剤量の大幅低減ができて、それによるペレットの不純物量も低減し、硬度も２５％増となって成型状況も良好であった。
【００２５】
以上本発明の代表例と思われる実施例について説明したが、本発明は必ずしもこれらの実施例構造のみに限定されるものではなく、潤滑剤の連続供給及び間欠供給のどちらにも対応可能であり、供給量も吸引時間及び噴霧器のスピーカ周波数、吸引量等を変えることにより変更可能で、また複数の塗布部分がある場合には複数の分岐も可能で、本発明にいう前記の構成要件を備え、かつ本発明にいう目的を達成し、以下にいう効果を有する範囲内において適宜改変して実施することができるものである。
【００２６】
【発明の効果】
以上の説明から既に明らかなように、本発明にいうところのペレット成型に用いる潤滑剤の供給方法は、潤滑剤を霧状にする噴霧器と、この噴霧器からの霧状潤滑剤を供給用のバルブを介してダイス上の潤滑剤カップに導くと共に、外気を外気吸引バルブを介して吸引する供給配管と、ダイスに供給された余剰の霧状潤滑剤を排出用のバルブを介して排出する排出配管と、供給配管内及び排出配管内の霧状潤滑剤を吸引する吸引器とを備え、霧状潤滑剤が潤滑剤カップに到達する時点で、供給用のバルブと排出用のバルブを閉鎖し、その後、外気吸引バルブを開放し、霧状潤滑剤を、ダイスホルダが上昇するとき発生する外気の吸引力にて潤滑剤カップよりダイス内に引き込み、ダイスの内壁に自然付着若しくは強制的に塗布する構成としている。また、潤滑剤を霧状にする噴霧器と、この噴霧器からの霧状潤滑剤をダイスに設置の噴射孔に導く供給配管と、ダイスに供給された余剰の霧状潤滑剤を排出する排出配管と、供給配管内及び排出配管内の霧状潤滑剤を吸引する吸引器とを備え、霧状潤滑剤を、ダイス内壁に沿う旋回流若しくは上方流によって、ダイス内壁に自然付着若しくは強制的に塗布する構成としているので、従来のように、粉末体と潤滑剤とを混合する混合工程や予備焼結工程等の設備のコストの削減をはかることができると共に純度が高く、硬度及び密度の向上したペレットを成型できる一方、使用される潤滑剤を効率よく塗布でき、使用される潤滑剤の大幅な低減をはかることができる。
更に、ダイスが上昇するときに発生する吸引力によりダイス内壁に霧状潤滑剤を付着させるため、より均一に塗布することもできる。
又、霧状潤滑剤をダイス内壁に沿う旋回流若しくは上方流によって塗布するために、ダイス内壁への付着力を高めて潤滑性をより向上することもできるという顕著な効果を期待することが出来るに至ったのである。
【図面の簡単な説明】
【図１】 本発明実施例の潤滑剤のフローを示す系統図。
【図２】 本発明実施例のダイスに潤滑剤を導入する概略説明図。
【図３】 本発明実施例のダイスに粉末体を導入する概略説明図。
【図４】 本発明実施例のダイスよりペレットを成型する概略説明図。
【図５】 本発明実施例のダイスよりペレットを取り出す概略説明図。
【図６】 本発明別実施例のダイスに潤滑剤を導入する概略説明図。
【符号の説明】
１ 噴霧器
２、３、５、６、７ バルブ
４ 供給配管
８ 排出配管
９ 吸引器
１０ 潤滑剤カップ
１１ 粉末体カップ
１２ 吸引配管
１３ 下パンチ
１４ ダイス
１５ ダイスホルダ
１６ 上パンチ
１７ 圧縮空気導入管
２３ 噴射孔
２４ 外気吸引バルブ
Ａ ペレット
ａ 粉末体
ｂ 霧状潤滑剤[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for supplying a lubricant to a die before pellet molding.
[0002]
[Prior art]
Conventionally, pellets such as nuclear fuel pellets and cemented carbide chips have been formed by stopping the die holder so that the upper end of the lower punch is positioned below the die of the die holder, and then scraping the raw material powder into the die of the die holder. After the die holder is lowered and stopped so that the upper end of the lower punch comes close to the center of the die, the upper punch is inserted into the die from the upper side and lowered to compress the powder in the die and mold it into pellets. While raising the upper punch inside, the die holder was further lowered so that the upper end of the lower punch was flush with the upper end of the die of the die holder, and the molded pellets were pushed up from inside the die.
[0003]
However, due to the expansion force of the pellet molded body on the wall in the die, an extra force is applied to push down the die holder, and the pellet is not pushed up more smoothly than in the die and is broken in the die to form the desired pellet. I couldn't.
[0004]
For this purpose, a lubricant is mixed with this raw material powder, the mixture is scraped into the die of the die holder, the pellet is molded as described above, the upper punch is raised from within the die, and then the die holder Has been developed to form pellets from the mixture.
[0005]
Since the lubricant in the mixture comes into contact with the wall in the die due to the pellets from the mixture, an excessive force to push down the die holder is not applied, and the pellets in the die can be smoothly raised.
[0006]
[Problems to be solved by the invention]
However, the pellets of this mixture require equipment for the mixing process of the lubricant to be mixed with the powder body, which requires a significant investment in equipment costs and product costs. In addition, a large amount of lubricant is required for the mixture, but it is an impurity for the molded pellets, so it is difficult to reduce the amount of lubricant, and the lubricant in the pellets is removed by volatilization. In particular, it was necessary to provide a process (pre-sintering process (degreasing process)). In addition, there is a problem that hardness and density cannot be improved with pellets made of a mixture.
[0007]
Therefore, the present invention solves the problems of such conventional pellet molding, can reduce the equipment costs such as the mixing step and the pre-sintering step, and has high purity, while you can mold hardness and density improved pellets, the lubricant used can efficiently coating, can be achieved a significant reduction of the lubricant used.
Furthermore, since the mist-like lubricant is attached to the inner wall of the die by the suction force generated when the die is raised, it can be applied more uniformly.
Also, since the mist-like lubricant is applied by swirling flow or upward flow along the inner wall of the die, the pellet molding method and molding aiming to improve the adhesion by increasing the adhesion to the inner wall of the die. It is in providing the supply method of the lubricant used for.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the structure of the method of supplying the lubricant used in the pellet molding of the present invention includes a sprayer 1 for making the lubricant into a mist and a valve for supplying the mist lubricant b from the sprayer 1. 2 and the supply pipe 4 for sucking outside air through the outside air suction valve 24 and a valve for discharging the excess mist lubricant b supplied to the die 14. And a suction pipe 9 for sucking the mist lubricant b in the supply pipe 4 and the discharge pipe 8, and when the mist lubricant b reaches the lubricant cup 10. Then, the supply valve 2 and the discharge valve 7 are closed, and then the outside air suction valve 24 is opened, and the mist lubricant b is lubricated by the outside air suction force generated when the die holder 15 is raised. Pull it into the die 14 from the agent cup 10, It is a natural adhesion or forcibly applied constituting the inner wall of the chair 14.
[0009]
Further, the structure of the method of supplying the lubricant used for pellet molding according to the present invention is that the sprayer 1 that makes the lubricant into a mist and the mist lubricant b from the sprayer 1 are guided to the injection hole 23 installed in the die 14. A supply pipe 4, a discharge pipe 8 that discharges excess mist lubricant b supplied to the die 14, and a suction device 9 that sucks the mist lubricant b in the supply pipe 4 and the discharge pipe 8 are provided. The mist-like lubricant b is naturally adhered or forcibly applied to the inner wall of the die 14 by a swirling flow or upward flow along the inner wall of the die 14.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
1 is a system diagram showing the flow of the lubricant according to the embodiment of the present invention, FIG. 2 is a schematic explanatory diagram for introducing the lubricant into the die of the embodiment of the present invention, and FIG. 3 is a powder in the die of the embodiment of the present invention. 4 is a schematic explanatory diagram for molding pellets from a die according to an embodiment of the present invention, FIG. 5 is a schematic explanatory diagram for taking out pellets from a die according to an embodiment of the present invention , and FIG. It is a schematic explanatory drawing which introduces a lubricant into an example die.
[0011]
In forming the pellet A, a stearic acid-based lubricant is adhered and applied to the die 14 of the die holder 15 before the raw powder body a is introduced into the die 14 of the die holder 15. As shown in FIG. 1, the stearic acid-based lubricant is mixed with air in the sprayer 1 to form a mist, and is supplied to the die 14 through the supply pipe 4 through the supply valve 2. At this time, the valve 5 and the valve 7 are opened, and the valve 3 and the valve 6 are closed.
[0012]
The sprayer 1 is provided with an upper lid 19 that covers the upper end of the tank 18, a vibration amplification plate 20 that receives the lubricant supplied to the lower surface of the tank 18, and a vibration amplification plate 20 below the vibration amplification plate 20. A speaker 21 to be vibrated is provided, and a lubricant introduction hole for introducing the lubricant into the tank 18 and a lubricant supply hole for introducing the mist-like lubricant b into the supply pipe 4 are provided. When the lubricant is charged into the tank 18 from the lubricant charging hole, the sprayer 1 operates the speaker 21 to vibrate the vibration amplifying plate 20, and the lubricant on the vibration amplifying plate 20 is mixed with air to form a mist. Then, it is supplied to the supply pipe 4 through the lubricant supply hole.
[0013]
When the mist lubricant b introduced from the supply pipe 4 into the die 14 reaches the die 14, the supply valve 2 and the discharge valve 7 are closed, and the mist lubricant is placed in the lubricant cup 10. Agent b is filled. Thereafter, the outside air suction valve 24 is opened, and the suction force generated when the die holder 15 is raised is forcibly drawn into the die 14.
[0014]
Due to this suction force, the mist-like lubricant b is attached and applied to the inner wall of the die 14 of the die holder 15. When the application of the die holder 15 to the inner wall of the die 14 is completed, the supply valve 5, the outside air suction valve 24, and the discharge valve 7 are opened. The excess mist lubricant b in the die 14 of the die holder 15 and the mist lubricant b in the supply pipe 4 and the discharge pipe 8 are sucked and accumulated in the suction device 9, and this accumulated mist lubricant is collected. b is recirculated into the nebulizer 1.
[0015]
Next, a supply system for the mist lubricant which is another embodiment will be described. The stearic acid-based lubricant is put into the tank 18 of the sprayer 1 and mixed with air to form a mist. The atomized lubricant b which has been atomized by the sprayer 1 is sent to the supply pipe 4 through the supply valve 2. At this time, the valve 3 and the valve 5 are closed, the suction valve 6 is opened, and the suction pipe 9 is once sucked in the supply pipe 4 through the suction pipe 12, and then the suction valve 6 is closed. The supply pipe 4 is filled with the mist lubricant b.
[0016]
When the mist lubricant b supplied from the sprayer 1 reaches the supply pipe 4, the valve 2 is closed, the valve 5 is opened, and the introduction valve 3 is also opened. The compressed air is guided to the supply pipe 4, and the mist lubricant b in the supply pipe 4 is forcibly filled in the dice 14 of the die holder 15 by the pressure of the compressed air, and adheres and is applied to the inner wall of the dice 14. .
[0017]
When the application of the die holder 15 to the inner wall of the die 14 is completed, the introduction valve 3 is closed, and the outside air suction valve 24 and the discharge valve 7 are opened. The excess mist lubricant b in 10 and the mist lubricant b in the supply pipe 4 are sucked and accumulated in the suction device 9, and the accumulated mist lubricant b is recirculated into the sprayer 1. .
[0018]
At this time , as shown in FIG. 6 , the mist lubricant b is sprayed from the injection hole 23 installed on the die 14 to adhere to the inner wall of the die 14 of the die holder 15, and the excess mist lubricant b is added to the die 14. It flows upward and is then recovered. Here, by changing the phase of the injection hole 23 of the die 14, it is possible to set various streamlines such as an upward direction or a swirling flow as a streamline generated on the inner wall of the die 14, and more efficiently. A mist lubricant can be adhered to the inner wall of the die .
[0019]
Thus, although the mist-like lubricant b is supplied, the molding of the pellet A will be described with reference to FIGS. The atomized lubricant b from the sprayer 1 is introduced into the lubricant cup 10. When the lubricant cup 10 is moved to the upper part of the die 14 of the die holder 15 and the die holder 15 is raised until the upper end of the lower punch 13 is positioned below the die 14, the downward suction force generated when the die holder 15 is moved is used. The mist lubricant b in the lubricant cup 10 is attached and applied to the inner wall of the die 14. After the application is completed, excess mist lubricant b in the lubricant cup 10 is sucked by the suction device 9. The upper punch 16 that moves up and down from above in the die 14 of the die holder 15 is positioned above the die 14, the lower punch 13 is fixed, and the die holder 15 moves up and down. (See Figure 2)
[0020]
Next, the lubricant cup 10 is separated from above the die 14 of the die holder 15, and instead the powder body cup 11 into which the powder body a is introduced is moved to the upper part of the die 14, so that the powder body a in the powder body cup 11 is placed on the inner wall. Scrape into the die 14 coated with the lubricant b. At this time, the upper punch 16 is separated from the die 14. (See Figure 3)
[0021]
When the powder body cup 11 is separated from above the die 14 of the die holder 15, the lubricant b is applied to the inner wall, and the upper punch 16 is moved downward from above into the die 14 in which the powder body a is scraped. The die holder 15 is lowered together with the punch 16, the powder body a in the die 14 is compressed by the upper punch 16 and the lower punch 13, and the pellet A is formed from the powder body a. (See Figure 4)
[0022]
Next, the upper punch 16 moves upward, the die holder 15 is lowered, and the pellet A is pushed up to the upper surface of the die 14. (See Figure 5)
[0023]
The pellet A thus molded easily slides inside the die 14 due to the influence of the lubricant b applied to the inner wall of the die 14, and is smoothly pushed up to the upper surface of the die 14 by the lowering of the die holder 15.
[0024]
Experimental example Uses molybdenum as powder and zinc stearate as lubricant.
The amount of the lubricant used was 35 mg with a use amount of 0.05 wt% compared to a use amount of 0.2 wt% of a mixture obtained by mixing a conventional powder body and a lubricant.
As a result,
Conventional mixture is 5.028 g / cc (sintered density), 100% (hardness)
Molded pellets are 5.047 g / cc (sintered density), 125% (hardness)
Therefore, the amount of lubricant used can be greatly reduced, the amount of impurities in the pellets is thereby reduced, the hardness is increased by 25%, and the molding condition is good.
[0025]
Although the embodiments considered to be representative examples of the present invention have been described above, the present invention is not necessarily limited only to the structures of these embodiments, and can be applied to both continuous supply and intermittent supply of lubricant. The supply amount can also be changed by changing the suction time, the speaker frequency of the sprayer, the suction amount, etc., and if there are a plurality of application parts, a plurality of branches can be made, and the above-mentioned configuration requirements according to the present invention are provided. In addition, the object of the present invention can be achieved and modified as appropriate within the scope of the following effects.
[0026]
【The invention's effect】
As is apparent from the above description, the lubricant supply method used in the pellet molding according to the present invention includes a sprayer for atomizing the lubricant and a valve for supplying the sprayed lubricant from the sprayer. And a supply pipe that guides the outside air to the lubricant cup on the die through the outside air suction valve, and a discharge pipe that discharges excess mist lubricant supplied to the die through the discharge valve And a suction device for sucking the mist lubricant in the supply pipe and the discharge pipe, and when the mist lubricant reaches the lubricant cup, the supply valve and the discharge valve are closed, After that, the outside air suction valve is opened, and the mist lubricant is drawn into the die from the lubricant cup by the outside air suction force generated when the die holder ascends, and is naturally adhered or forcibly applied to the inner wall of the die. As That. Also, a sprayer that makes the lubricant into a mist, a supply pipe that guides the mist lubricant from the sprayer to an injection hole installed in the die, and a discharge pipe that discharges excess mist lubricant supplied to the die And a suction device for sucking the mist lubricant in the supply pipe and the discharge pipe, and the mist lubricant is naturally attached to or forcibly applied to the inner wall of the die by a swirling flow or upward flow along the inner wall of the die. Because it is configured, pellets with high purity, high hardness and density, as well as conventional equipment can reduce the cost of equipment such as mixing process and pre-sintering process to mix powder body and lubricant In addition, the lubricant used can be efficiently applied , and the lubricant used can be greatly reduced.
Furthermore, since the mist-like lubricant is attached to the inner wall of the die by the suction force generated when the die is raised, it can be applied more uniformly.
In addition, since the mist-like lubricant is applied by swirling flow or upward flow along the inner wall of the die, it is possible to expect a remarkable effect that the adhesion to the inner wall of the die can be increased and the lubricity can be further improved. It came to.
[Brief description of the drawings]
FIG. 1 is a system diagram showing a flow of a lubricant according to an embodiment of the present invention.
FIG. 2 is a schematic explanatory diagram for introducing a lubricant into a die according to an embodiment of the present invention.
FIG. 3 is a schematic explanatory diagram for introducing a powder body into a die according to an embodiment of the present invention.
FIG. 4 is a schematic explanatory view of molding a pellet from a die according to an embodiment of the present invention.
FIG. 5 is a schematic explanatory view of taking out pellets from a die according to an embodiment of the present invention.
FIG. 6 is a schematic explanatory diagram for introducing a lubricant into a die according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sprayer 2, 3, 5, 6, 7 Valve 4 Supply piping 8 Discharge piping 9 Suction device 10 Lubricant cup 11 Powder body cup 12 Suction piping 13 Lower punch 14 Dice 15 Die holder 16 Upper punch 17 Compressed air introduction tube
23 Injection hole 24 Outside air suction valve A Pellet a Powder body b Atomized lubricant

Claims (2)

ペレット(A)成型前のダイス(14)に潤滑剤を供給する方法であって、
潤滑剤を霧状にする噴霧器(1)と、この噴霧器(1)からの霧状潤滑剤(b)を供給用のバルブ(2)を介してダイス(14)上の潤滑剤カップ(10)に導くと共に、外気を外気吸引バルブ(24)を介して吸引する供給配管(4)と、ダイス(14)に供給された余剰の霧状潤滑剤(b)を排出用のバルブ(7)を介して排出する排出配管(8)と、供給配管(4)内及び排出配管(8)内の霧状潤滑剤(b)を吸引する吸引器(9)とを備え、
霧状潤滑剤(b)が潤滑剤カップ(10)に到達する時点で、供給用のバルブ(2)と排出用のバルブ(7)を閉鎖し、その後、外気吸引バルブ(24)を開放し、霧状潤滑剤(b)を、ダイスホルダ(15)が上昇するときに発生する外気の吸引力にて潤滑剤カップ(10)よりダイス(14)内に引き込み、ダイス(14)の内壁に自然付着若しくは強制的に塗布することを特徴としたペレット成型に用いる潤滑剤の供給方法。A method of supplying a lubricant to a die (14) before molding a pellet (A),
A sprayer (1) for atomizing the lubricant and a lubricant cup (10) on the die (14) through a valve (2) for supplying the sprayed lubricant (b) from the sprayer (1) Supply pipe (4) for sucking outside air through the outside air suction valve (24), and a discharge valve (7) for discharging excess mist lubricant (b) supplied to the die (14). A discharge pipe (8) for discharging through the suction pipe, and a suction device (9) for sucking the mist lubricant (b) in the supply pipe (4) and the discharge pipe (8),
When the atomized lubricant (b) reaches the lubricant cup (10), the supply valve (2) and the discharge valve (7) are closed, and then the outside air suction valve (24) is opened. The mist-like lubricant (b) is drawn into the die (14) from the lubricant cup (10) by the suction force of the outside air generated when the die holder (15) ascends, and naturally flows into the inner wall of the die (14). A method for supplying a lubricant used for pellet molding, characterized by being adhered or forcibly applied. ペレット(A)成型前のダイス(14)に潤滑剤を供給する方法であって、
潤滑剤を霧状にする噴霧器(1)と、この噴霧器(1)からの霧状潤滑剤(b)をダイス(14)に設置の噴射孔(23)に導く供給配管(4)と、ダイス(14)に供給された余剰の霧状潤滑剤(b)を排出する排出配管(8)と、供給配管(4)内及び排出配管(8)内の霧状潤滑剤(b)を吸引する吸引器(9)とを備え、
霧状潤滑剤(b)を、ダイス(14)内壁に沿う旋回流若しくは上方流によって、ダイス(14)内壁に自然付着若しくは強制的に塗布することを特徴とするペレット成型に用いる潤滑剤の供給方法。A method of supplying a lubricant to a die (14) before molding a pellet (A),
A sprayer (1) for atomizing the lubricant, a supply pipe (4) for guiding the sprayed lubricant (b) from the sprayer (1) to the injection hole (23) installed in the die (14), and the die The discharge pipe (8) that discharges the excess mist lubricant (b) supplied to (14), and the mist lubricant (b) in the supply pipe (4) and the discharge pipe (8) are sucked. A suction device (9),
Supply of lubricant used for pellet molding, characterized in that mist-like lubricant (b) is naturally attached to or forcedly applied to the inner wall of the die (14) by swirling flow or upward flow along the inner wall of the die (14) Method.
JP2003146172A 2003-05-23 2003-05-23 Lubricant supply method for pellet molding Expired - Fee Related JP4419117B2 (en)

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