JP2004298917A - Method and device for molding umbrella-shaped powder compact - Google Patents

Method and device for molding umbrella-shaped powder compact Download PDF

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Publication number
JP2004298917A
JP2004298917A JP2003094515A JP2003094515A JP2004298917A JP 2004298917 A JP2004298917 A JP 2004298917A JP 2003094515 A JP2003094515 A JP 2003094515A JP 2003094515 A JP2003094515 A JP 2003094515A JP 2004298917 A JP2004298917 A JP 2004298917A
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die
molded body
lower punch
punch
umbrella
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JP4443847B2 (en
Inventor
Tsuginori Shobu
次憲 菖蒲
Osamu Motai
理 馬渡
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Resonac Corp
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Hitachi Powdered Metals Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/04—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with a fixed mould

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a powder molding of an umbrella-shaped gear with a boss by which the occurrence of burrs on the tooth part of the compact is prevented by optimizing the occurrence position of the burrs in the compact. <P>SOLUTION: Material powder is filled in a cavity which is formed of a core rod 1, a floating type main die 2, a hollow outer lower punch 5, and a hollow inner lower punch 6. Next, a sub-die 7 having a die surface corresponding to the outside-diameter surface, the tooth surface, and the top of the compact, and an upper punch 8 which is fit into the sub-die vertically movably and has a die surface corresponding to the top of the compact are made flush with one another, and the sub-die is lowered in this state and brought into contact with the main die. After that, compressive molding is performed with the upper punch, the outer lower punch, and the inner lower punch. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明が属する技術分野】
本発明は、粉末冶金法を用いた傘状粉末成形体の成形方法および成形装置に係り、とくに、成形体において、ばりの発生位置の適正化を図るとともに、ばりの除去処理を簡易なものとした傘状粉末成形体の成形技術に関する。
【０００２】
【従来の技術】
従来、ボス付き歯車を製造するに際し、原料粉末を上下パンチにより圧縮して成形体を得る手段としては、図５に概略を示す成形装置を利用したものが開示されている（特許文献１参照）。特許文献１によれば、この装置を使用して、まず、上下に分割された下側の主ダイ１０の型孔とこれに嵌合する外下パンチ１１および内下パンチ１２で形成するキャビティ内に原料粉末を充填後、成形体のボス部外径に対応する型孔を有する上側の副ダイ１３を主ダイ１０に降下、当接させ、次いで内下パンチ１２を上昇させて成形体のボス部に相当する原料粉末を副ダイ１３の型孔内に移動させ、しかる後に上パンチ１４および下パンチ１１，１２による圧縮成形を行い、所望の成形体を得ている。
【０００３】
【特許文献１】
特公平８−３２９２２号公報（特許請求の範囲、第４図）
【０００４】
【発明が解決しようとする課題】
近年、ボス付き歯車においては、種々の形状のものが開発されるに到っており、中でも歯面が断面視で傾斜している傘状歯車がさかんに製造されている。この傘状歯車を上記特許文献１に記載された手段を用いて成形する場合には、図６に示すように、通常、成形体の歯面２０および上面２１に対応する凹面を有する上パンチ２２を用いて傘状歯車が成形される。ここで、上パンチ２２の外周端２３に面取りを施さない場合には、上パンチ２２とダイ２４との間に摩耗、破損を生ずるおそれがある。このため、図７に図６の点線部分を拡大して示すように、外周端２３には平坦部２５が形成されている。
【０００５】
このように、平坦部２５を有する上パンチ２２と下パンチ２６とによる圧縮成形の際には、ダイ２４と上下パンチ２２，２６との各隙間に圧粉体が入り込む。このため、離型に際しては、成形体の縁にばり２７，２８が形成される。とくに、歯部２０にばり２７が存在する場合には、傘状歯車の使用時に、噛み合わせ相手である他の歯車との噛み合わせを円滑に行うことができないのみならず、傘状歯車が上記他の歯車から脱落するおそれや、他の歯車に摩耗、破損を生ずるおそれもある。したがって、傘状歯車の使用前にばり２７を除去する必要があり、これに伴い、傘状歯車の製造工程が煩雑化するのみならず、製造コストが割高になるという問題がある。
【０００６】
本発明は、上記問題を解決すべくなされたものであり、ボス付きの傘状歯車の製造において、成形体のばりの発生位置を適正化して、成形体の歯部へのばりの発生を防止することにより、傘状歯車の使用時に、噛み合わせ相手である他の歯車との円滑な噛み合わせを実現するとともに、傘状歯車の上記他の歯車からの脱落を防止し、しかも他の歯車の摩耗、破損を防止することを目的とする。また、本発明は、成形体の歯部以外の部分にばりが発生した場合であっても、ばりの除去処理を簡易なものとして、傘状歯車の製造工程を煩雑とせず、製造コストの低減を図ることも目的としている。
【０００７】
【課題を解決するための手段】
本発明の傘状粉末成形体の成形方法は、コアロッドと、成形体の外径面に対応する型面を有する浮動式の主ダイと、上記主ダイに対して上下動可能に嵌合し、内径が成形体のボス部外径に対応する中空状の外下パンチと、上記コアロッドおよび上記外下パンチに対して上下動可能に嵌合する中空状の内下パンチとにより形成されたキャビティ内に原料粉末を充填し、次いで、成形体の外径面、歯面および上面に対応する型面を有する副ダイと、上記副ダイに対して上下動可能に嵌合し、成形体の上面に対応する型面を有する上パンチとを面一状態とし、この状態で上記副ダイを上記主ダイに降下、当接し、しかる後に、上記上パンチ、上記外下パンチおよび上記内下パンチにより圧縮成形を行うことを特徴としている。
【０００８】
本発明の傘状粉末成形体の成形方法では、上下に分割されたダイのうち上側に位置する副ダイにより、成形体の外径面の一部、歯面の全部および上面の一部が形成される。換言すれば、成形体の歯面は副ダイのみにより成形され、しかも歯面の両端部から連なる外径面および上面の一部も副ダイにより成形される。このため、本発明の成形方法では、上記図７に示したように、歯面にばりが生じることはない。したがって、傘状歯車の使用時に、噛み合わせ相手である他の歯車との円滑な噛み合わせを実現するとともに、傘状歯車の上記他の歯車からの脱落を防止し、しかも他の歯車の摩耗、破損を防止することができる。
【０００９】
また、本発明の成形方法では、成形体の外径面が主ダイと副ダイとにより成形される。このため、粉末圧縮成形時には、主ダイと副ダイとの間に圧粉体が入り込み、離型した後にばりが生ずるおそれがある。しかしながら、成形体の外径面にばりが生じたとしても、傘状歯車の使用に際して噛み合わせ相手との間においては機能上の問題はない。したがって、成形体の外径面に生じたばりはとくに取り除く必要がない。なお、成形体の外径面に生じたばりを取り除く場合であっても、このばりは図７に示すように成形体の一の面と他の面との境界部に位置するものではなく、同一面内部に存在するものであるため、容易にその除去を実行することができる。
【００１０】
さらに、本発明の成形方法では、上下に分割されたダイのうち下側に位置する主ダイを浮動式としている。これにより、主ダイによって圧縮成形を行う際の緩衝機構を実現し、原料粉末の急激な圧縮または成形体の急激な抜き出しによる局部的な応力の負荷を防止することができることから、健全な成形体を製造することができる。また、上パンチを副ダイに対して上下動可能としたことにより、上パンチは原料粉末の圧縮成形に寄与するのみならず、成形体の抜き出しを行うに際し、いわゆるノックアウトパンチ作用に寄与することもできる。
【００１１】
このような傘状粉末成形体の成形方法においては、上記主ダイの浮動を、ばね、油圧、空圧のいずれかにより行うことができ、また、上記上パンチの上下動を、上記副ダイに取り付けられた流体シリンダにより行うことができる。
【００１２】
次に、本発明の傘状粉末成形体の成形装置は、上述した傘状粉末成形体の成形方法を好適に実施するためのものであって、コアロッドと、成形体の外径面に対応する型面を有する浮動式の主ダイと、上記主ダイに対して上下動可能に嵌合し、内径が成形体のボス部外径に対応する中空状の外下パンチと、上記コアロッドおよび上記外下パンチに対して上下動可能に嵌合する中空状の内下パンチと、成形体の外径面、歯面および上面に対応する型面を有し、上記主ダイの上面に対して離接可能な副ダイと、上記副ダイに対して上下動可能に嵌合し、成形体の上面に対応する型面を有する上パンチとを備えることを特徴としている。
【００１３】
本発明の成形装置では、上述したとおり、成形体におけるばりの発生位置の適正化を図ることにより、傘状歯車の使用時に、噛み合わせ相手である他の歯車との円滑な噛み合わせを実現するとともに、傘状歯車の上記他の歯車からの脱落を防止し、しかも他の歯車の摩耗、破損を防止することができる。また、成形体の外径面に生じたばりを取り除く場合であっても、容易にその除去を実行することができる。なお、副ダイは、周囲のスペースが許容される範囲において、外径を大きく形成してその肉厚を厚くすることができるため、その強度を十分に確保することができる。よって、成形体の優れた成型密度を実現することができる。
【００１４】
【発明の実施の形態】
以下に、本発明の実施形態を図面を参照して説明する。
図１は、本発明の傘状粉末成形体の成形装置の原料粉末充填状態を示す断面図である。同図において、コアロッド１が中心に配置され、成形体の外径面に対応する型面を有する主ダイ２が、ダイガイド３に嵌合された状態でばね４により上方に付勢されて浮動可能とされている。また、内径が成形体のボス部外径に対応する中空状の外下パンチ５が、主ダイ２に対して上下動可能に嵌合され、中空状の内下パンチ６がコアロッド１および外下パンチ５に対して上下動可能に嵌合されている。さらに、成形体の外径面、歯面および上面に対応する型面を有する副ダイ７が、主ダイ２の上面に対して離接可能とされ、成形体の上面に対応する型面を有する上パンチ８が、副ダイ７に取り付けられた流体シリンダ９により副ダイ７に対して上下動可能に嵌合されている。なお、本例では、上述したように、主ダイ２の付勢手段がばね４であるが、ダイガイド３をシリンダとするとともに、主ダイ２をピストンとして、油圧または空圧により主ダイ２を昇降させることもできる。
【００１５】
ここで、流体シリンダ９は、流体と接触する部材の汚染を考慮すると、空圧によるものすることが好ましいが、油圧によるものとすることもできる。また、流体シリンダ９の動作は、装置の稼働（例えば、副ダイ７の昇降）と関連させるためにシーケンス回路により制御することができる。
【００１６】
また、図１に示す装置は、コアロッド１とダイガイド３とが固定式で、上下パンチ５，６，８がそれぞれ昇降するタイプとすることができ、また、コアロッド１とウイズドロアル式のダイガイド３とが同時に昇降可能で、下パンチ５，６が固定式または内下パンチ６が昇降するタイプとすることもできる。
【００１７】
次に、図１に示した装置を用いた本発明の傘状粉末成形体の成形方法について説明する。
まず、図１に示す状態で粉末Ｐを充填する。この状態では、上パンチ８の上面はストッパに当接しており、下面は副ダイ７とともに面一状態となって成形体の上端面に対応する面が形成されている。
【００１８】
次に、図２に示すように、上ラム側７，８，９が下降、浸入すると、副ダイ７が主ダイ２に接し、主ダイ２および副ダイ７が浮動状態で下降する。粉末Ｐは、キャビティの上方空間部にも移動し、上ラム側７，８，９と下パンチ５，６との距離が縮まることで圧縮成形される。本例では上ラム側７，８，９を下降させることにより圧縮成形を行っているが、プレス構造によっては、下パンチ５，６を上方へ移動させて圧縮成形を行うこともできる。
【００１９】
以上のように得た成形体を抜き出す際には、いくつかの方法を採用することができる。例えば、図３に示すように、流体シリンダ９の入り口９ａから圧力を与えて上パンチ８でボス付き傘歯車Ｇを押圧した状態で、副ダイ７を上昇してボス付き傘歯車Ｇを抜き出すことができる。この場合、ボス付き傘歯車Ｇは上方から押圧されているので、ボス付き傘歯車Ｇおよび主ダイ２は移動しない。さらに副ダイ７が上昇すると、上パンチ８がボス付き傘歯車Ｇから離間する。その際、ボス付き傘歯車Ｇの大きさに比してコアロッド１が十分に細い場合のように、ボス付き傘歯車Ｇと下パンチ５，６およびコアロッド１との摩擦が少なければ、主ダイ２とボス付き傘歯車Ｇとがばね４により上昇する。この上昇に追従して、内下パンチ６を上昇させれば、図４のように、主ダイ２からボス付き傘歯車Ｇが抜き出される。
【００２０】
また、他の方法では、図３に示す圧縮完了後に、上パンチ８を下方に突き出さずに、上ラム側７，８，９と主ダイ２とを同時に上昇する。図３において、主ダイ２が上限のストッパＳに当接すると主ダイ２からボス付き傘歯車Ｇは抜き出される。また、この動作と同時に、流体シリンダ９を作動させて、上パンチ８を下方に付勢し、主ダイ２からボス付き傘歯車Ｇを抜き出すことができる。以上は、成形体であるボス付き傘歯車の抜き出し手段の一例であるが、これら基本態様の下に、抜き出し手段は、成形体の大きさ、肉厚、またはボス部および傘部の大きさなどに起因する抜き出し応力に鑑みて離型性を考慮し、種々変更することができる。
【００２１】
このように製造されたボス付き傘歯車は、その歯部においてばりは発生しない。したがって、ボス付き傘歯車の使用時に、噛み合わせ相手である他の歯車との円滑な噛み合わせを実現するとともに、ボス付き傘歯車の上記他の歯車からの脱落を防止し、しかも他の歯車の摩耗、破損を防止することができる。なお、図４に示したボス付き傘歯車Ｇには、その外径面にばりが生ずるおそれがあるが、このばりはボス付き傘歯車の一の面と他の面との境界部に位置するものではなく、同一面内部に存在するものであるため、容易にその除去を実行することができる。
【００２２】
【発明の効果】
以上説明したように本発明によれば、成形体におけるばりの発生位置の適正化を図ることにより、傘状歯車の使用時に、噛み合わせ相手である他の歯車との円滑な噛み合わせを実現するとともに、傘状歯車の上記他の歯車からの脱落を防止し、しかも他の歯車の摩耗、破損を防止することができる。また、成形体の外径面に生じたばりを取り除く場合であっても、容易にその除去を実行することができる。したがって、本発明は、各種焼結機械部品として好適な傘状粉末成形体の成形方法および成形装置を提供することができる点で有望である。
【図面の簡単な説明】
【図１】本発明の傘状粉末成形体の成形装置の原料粉末充填状態を示す断面図である。
【図２】本発明の傘状粉末成形体の成形装置の上ラム側の下降、浸入工程を示す断面図である。
【図３】本発明の傘状粉末成形体の成形装置の成形体抜き出し工程を示す断面図である。
【図４】本発明の傘状粉末成形体の成形装置の成形体抜き出し工程を示す断面図である。
【図５】従来の成形装置を示す断面図である。
【図６】従来の成形装置による傘状粉末成形体の成形工程を示す断面図である。
【図７】図６の点線部分を拡大して示した断面図である。
【符号の説明】
１…コアロッド、２…主ダイ、３…ダイガイド、４…ばね、５…外下パンチ、６…内下パンチ、７…副ダイ、８…上パンチ、９…流体シリンダ、Ｐ…粉末。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and apparatus for molding an umbrella-shaped powder compact using powder metallurgy, in particular, in a compact, aiming at optimizing the position at which burrs are generated, and simplifying the process of removing burrs. The present invention relates to a molding technique for a shaped umbrella-shaped powder compact.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in manufacturing a bossed gear, as a means for obtaining a compact by compressing raw material powder with upper and lower punches, a device utilizing a molding apparatus schematically shown in FIG. 5 has been disclosed (see Patent Document 1). . According to Patent Document 1, using this apparatus, first, the inside of a cavity formed by a die hole of a lower main die 10 which is divided into upper and lower parts, and an outer lower punch 11 and an inner lower punch 12 which fits into the hole. After the raw material powder is filled in, the upper sub die 13 having a mold hole corresponding to the outer diameter of the boss portion of the molded body is lowered and brought into contact with the main die 10, and then the inner and lower punches 12 are raised to raise the boss of the molded body. The raw material powder corresponding to the portion is moved into the mold hole of the sub-die 13 and then compression-molded by the upper punch 14 and the lower punches 11 and 12 to obtain a desired compact.
[0003]
[Patent Document 1]
Japanese Patent Publication No. 8-32922 (Claims, FIG. 4)
[0004]
[Problems to be solved by the invention]
In recent years, various shapes of bossed gears have been developed, and among them, bevel gears whose tooth surfaces are inclined in a sectional view have been actively manufactured. When this bevel gear is formed by using the means described in Patent Document 1, as shown in FIG. 6, an upper punch 22 having a concave surface corresponding to the tooth surface 20 and the upper surface 21 of the formed body is usually used. Is used to form a bevel gear. Here, if the outer peripheral end 23 of the upper punch 22 is not chamfered, abrasion and breakage may occur between the upper punch 22 and the die 24. Therefore, a flat portion 25 is formed on the outer peripheral end 23 as shown in FIG.
[0005]
As described above, during the compression molding by the upper punch 22 and the lower punch 26 each having the flat portion 25, the compact enters the gap between the die 24 and the upper and lower punches 22 and 26. Therefore, when releasing the mold, burrs 27 and 28 are formed on the edge of the molded body. In particular, when the burrs 27 are present in the tooth portions 20, when the umbrella gear is used, not only the meshing with the other gear to be meshed cannot be smoothly performed, but also the umbrella gear is There is also a possibility that the gears may fall off from other gears, or the other gears may be worn or damaged. Therefore, it is necessary to remove the burrs 27 before using the bevel gear, which causes a problem that not only the manufacturing process of the bevel gear becomes complicated, but also that the manufacturing cost increases.
[0006]
The present invention has been made to solve the above-described problem, and in the production of a bevel gear with a boss, optimizes the position at which burrs are generated on a molded body to prevent the generation of burrs on the teeth of the molded body. By doing so, when using the bevel gear, while realizing smooth meshing with other gears that are meshed with each other, the bevel gear is prevented from falling off from the other gear, and the other gear is The purpose is to prevent wear and breakage. In addition, the present invention reduces the manufacturing cost without complicating the manufacturing process of the bevel gear by simplifying the process of removing burrs even when burrs occur in portions other than the teeth of the molded body. It is also intended to aim for.
[0007]
[Means for Solving the Problems]
The molding method of the umbrella-shaped powder molded body of the present invention is a core rod, a floating main die having a mold surface corresponding to the outer diameter surface of the molded body, and vertically movably fitted to the main die, Inside a cavity formed by a hollow outer lower punch whose inner diameter corresponds to the outer diameter of the boss portion of the molded body, and a hollow inner lower punch that is vertically movably fitted to the core rod and the outer lower punch. Is filled with the raw material powder, and then a sub die having a mold surface corresponding to an outer diameter surface, a tooth surface and an upper surface of the molded body, and is vertically movably fitted to the sub die, and The upper punch having the corresponding mold surface is brought into a flush state, and in this state, the sub die is lowered and brought into contact with the main die, and thereafter, compression molded by the upper punch, the outer lower punch, and the inner lower punch. It is characterized by performing.
[0008]
In the molding method of the umbrella-shaped powder molded body of the present invention, a part of the outer diameter surface, a part of the tooth surface, and a part of the upper surface of the molded body are formed by the sub die positioned on the upper side of the vertically divided die. Is done. In other words, the tooth surface of the molded body is formed only by the sub-die, and the outer diameter surface and a part of the upper surface continuous from both ends of the tooth surface are also formed by the sub-die. Therefore, according to the molding method of the present invention, no burrs are generated on the tooth surface as shown in FIG. Therefore, when using the bevel gear, while realizing smooth meshing with other gears that are meshed with each other, preventing the bevel gear from falling off from the other gears, and further, abrasion of the other gears, Damage can be prevented.
[0009]
Further, in the forming method of the present invention, the outer diameter surface of the formed body is formed by the main die and the sub die. For this reason, at the time of powder compression molding, the green compact may enter between the main die and the sub die, and burrs may be generated after release from the mold. However, even if burrs occur on the outer diameter surface of the molded body, there is no functional problem with the meshing partner when using the bevel gear. Therefore, it is not necessary to particularly remove the flash generated on the outer diameter surface of the molded body. Even when removing the burrs generated on the outer diameter surface of the molded body, the burrs are not located at the boundary between one surface and the other surface of the molded body as shown in FIG. Since they exist inside the same plane, their removal can be easily performed.
[0010]
Further, in the molding method of the present invention, the main die located on the lower side of the vertically divided dies is of a floating type. This realizes a buffer mechanism when compression molding is performed by the main die, and can prevent local stress load due to rapid compression of the raw material powder or rapid extraction of the molded body. Can be manufactured. In addition, since the upper punch can be moved up and down with respect to the sub die, the upper punch not only contributes to the compression molding of the raw material powder but also contributes to the so-called knockout punching function when extracting the molded body. it can.
[0011]
In such a method of forming an umbrella-shaped powder compact, the floating of the main die can be performed by any of a spring, a hydraulic pressure, and a pneumatic pressure, and the vertical movement of the upper punch is applied to the auxiliary die. This can be done with an attached fluid cylinder.
[0012]
Next, the apparatus for forming an umbrella-shaped powder compact of the present invention is for suitably implementing the above-described method for forming an umbrella-shaped powder compact, and corresponds to a core rod and an outer diameter surface of the compact. A floating main die having a mold surface, a hollow outer lower punch which is vertically movably fitted to the main die, and whose inner diameter corresponds to the outer diameter of the boss portion of the molded body; It has a hollow inner lower punch that fits vertically to the lower punch, and a mold surface corresponding to the outer diameter surface, tooth surface and upper surface of the molded body, and separates from and adheres to the upper surface of the main die. It is characterized by comprising a possible sub-die and an upper punch fitted to the sub-die so as to be vertically movable and having a mold surface corresponding to the upper surface of the molded body.
[0013]
In the molding apparatus of the present invention, as described above, when the burring gear is used, smooth engagement with another gear to be meshed with is realized by optimizing the position where burrs are generated in the molded body. At the same time, it is possible to prevent the bevel gear from falling off from the other gear, and to prevent wear and breakage of the other gear. Further, even when removing the flash generated on the outer diameter surface of the molded body, the removal can be easily performed. In addition, the secondary die can be formed to have a large outer diameter and a large thickness in a range in which the surrounding space is allowed, so that the strength can be sufficiently ensured. Therefore, an excellent molding density of the molded body can be realized.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a raw material powder filling state of an umbrella-shaped powder molded product molding apparatus of the present invention. In FIG. 1, a main die 2 having a core rod 1 disposed at the center and having a mold surface corresponding to the outer diameter surface of a molded body is urged upward by a spring 4 while being fitted to a die guide 3 and floats. It is possible. A hollow outer lower punch 5 whose inner diameter corresponds to the outer diameter of the boss portion of the molded body is fitted to the main die 2 so as to be vertically movable, and the hollow inner lower punch 6 is connected to the core rod 1 and the outer lower punch. It is fitted to the punch 5 so as to be able to move up and down. Further, the sub die 7 having a mold surface corresponding to the outer diameter surface, the tooth surface and the upper surface of the molded body is detachable from the upper surface of the main die 2 and has a mold surface corresponding to the upper surface of the molded body. An upper punch 8 is vertically movably fitted to the sub die 7 by a fluid cylinder 9 attached to the sub die 7. In this example, as described above, the biasing means of the main die 2 is the spring 4, but the die guide 3 is a cylinder, and the main die 2 is a piston. It can be raised and lowered.
[0015]
Here, the fluid cylinder 9 is preferably formed by pneumatic pressure in consideration of contamination of a member coming into contact with the fluid, but may be formed by hydraulic pressure. Further, the operation of the fluid cylinder 9 can be controlled by a sequence circuit in order to correlate with the operation of the apparatus (for example, the elevation of the sub die 7).
[0016]
In the apparatus shown in FIG. 1, the core rod 1 and the die guide 3 can be fixed, and the upper and lower punches 5, 6, and 8 can be moved up and down, respectively. Can be raised and lowered at the same time, and the lower punches 5 and 6 can be fixed or the inner lower punch 6 can be raised and lowered.
[0017]
Next, a method for forming an umbrella-shaped powder compact of the present invention using the apparatus shown in FIG. 1 will be described.
First, the powder P is filled in the state shown in FIG. In this state, the upper surface of the upper punch 8 is in contact with the stopper, and the lower surface thereof is flush with the sub die 7 to form a surface corresponding to the upper end surface of the molded body.
[0018]
Next, as shown in FIG. 2, when the upper ram side 7, 8, 9 descends and penetrates, the sub die 7 comes into contact with the main die 2, and the main die 2 and the sub die 7 descend in a floating state. The powder P also moves to the space above the cavity, and is compacted by reducing the distance between the upper ram sides 7, 8, 9 and the lower punches 5, 6. In this example, the compression molding is performed by lowering the upper ram sides 7, 8, 9; however, depending on the press structure, the compression molding can be performed by moving the lower punches 5, 6 upward.
[0019]
When extracting the compact obtained as described above, several methods can be adopted. For example, as shown in FIG. 3, in a state in which pressure is applied from the inlet 9 a of the fluid cylinder 9 and the upper punch 8 presses the boss bevel gear G with the upper punch 8, the sub die 7 is lifted to extract the boss bevel gear G. Can be. In this case, since the boss bevel gear G is pressed from above, the boss bevel gear G and the main die 2 do not move. When the sub die 7 further rises, the upper punch 8 separates from the bevel gear G with boss. At this time, if the friction between the bossed bevel gear G and the lower punches 5, 6 and the core rod 1 is small as in the case where the core rod 1 is sufficiently thin compared to the size of the bossed bevel gear G, the main die 2 And the boss bevel gear G are raised by the spring 4. If the inner lower punch 6 is raised following this rise, the bevel gear G with boss is extracted from the main die 2 as shown in FIG.
[0020]
In another method, after the completion of the compression shown in FIG. 3, the upper ram side 7, 8, 9 and the main die 2 are simultaneously raised without projecting the upper punch 8 downward. In FIG. 3, when the main die 2 comes into contact with the upper limit stopper S, the bevel gear G with boss is extracted from the main die 2. Simultaneously with this operation, the fluid cylinder 9 is actuated to urge the upper punch 8 downward, and the bevel gear G with boss can be extracted from the main die 2. The above is an example of a means for extracting a boss bevel gear with a boss, which is a molded body. Under these basic aspects, the extracting means may include, for example, a molded body having a size, a wall thickness, or a boss portion and a beveled portion. Various changes can be made in consideration of the releasability in view of the extraction stress caused by the above.
[0021]
The bossed bevel gear manufactured in this manner has no burrs at its teeth. Therefore, when using the bevel gear with boss, while realizing smooth meshing with the other gear which is the meshing partner, it is possible to prevent the bevel gear with boss from falling off from the other gear, and to prevent the other gear from being disengaged. Wear and breakage can be prevented. The boss bevel gear G shown in FIG. 4 may have burrs on its outer diameter surface, but this burr is located at the boundary between one surface of the boss bevel gear and the other surface. Since these are not present but exist within the same plane, their removal can be performed easily.
[0022]
【The invention's effect】
As described above, according to the present invention, when a bevel gear is used, a smooth meshing with another gear which is a meshing partner is realized by optimizing a position where burrs are generated in a molded body. At the same time, it is possible to prevent the bevel gear from falling off from the other gear, and to prevent wear and breakage of the other gear. Further, even when removing the flash generated on the outer diameter surface of the molded body, the removal can be easily performed. Therefore, the present invention is promising in that it can provide a molding method and a molding apparatus of an umbrella-shaped powder compact suitable as various sintered machine parts.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a raw material powder filling state of an umbrella-shaped powder molded product molding apparatus of the present invention.
FIG. 2 is a cross-sectional view showing a lowering and infiltration process of the upper ram side of the molding device of the umbrella-shaped powder molded product of the present invention.
FIG. 3 is a cross-sectional view illustrating a step of extracting a compact from the apparatus for molding an umbrella-shaped powder compact according to the present invention.
FIG. 4 is a cross-sectional view showing a step of extracting a compact from the umbrella-shaped compact of the present invention.
FIG. 5 is a sectional view showing a conventional molding apparatus.
FIG. 6 is a cross-sectional view showing a step of forming an umbrella-shaped powder compact by a conventional molding apparatus.
FIG. 7 is an enlarged cross-sectional view of a portion indicated by a dotted line in FIG. 6;
[Explanation of symbols]
1 core rod, 2 main die, 3 die guide, 4 spring, 5 outer lower punch, 6 inner lower punch, 7 auxiliary die, 8 upper punch, 9 fluid cylinder, P powder.

Claims (4)

コアロッドと、成形体の外径面に対応する型面を有する浮動式の主ダイと、前記主ダイに対して上下動可能に嵌合し、内径が成形体のボス部外径に対応する中空状の外下パンチと、前記コアロッドおよび前記外下パンチに対して上下動可能に嵌合する中空状の内下パンチとにより形成されたキャビティ内に原料粉末を充填し、次いで、成形体の外径面、歯面および上面に対応する型面を有する副ダイと、前記副ダイに対して上下動可能に嵌合し、成形体の上面に対応する型面を有する上パンチとを面一状態とし、この状態で前記副ダイを前記主ダイに降下、当接し、しかる後に、前記上パンチ、前記外下パンチおよび前記内下パンチにより圧縮成形を行うことを特徴とする傘状粉末成形体の成形方法。A core rod, a floating main die having a mold surface corresponding to an outer diameter surface of the molded body, and a hollow which is vertically movably fitted to the main die, and whose inner diameter corresponds to the outer diameter of the boss portion of the molded body. The raw material powder is filled in a cavity formed by an outer lower punch having a hollow shape and a hollow inner lower punch which is vertically movably fitted to the core rod and the outer lower punch. A secondary die having a die surface corresponding to a radial surface, a tooth surface and an upper surface, and an upper punch fitted to the secondary die so as to be vertically movable and having a die surface corresponding to the upper surface of the formed body are flush with each other. And, in this state, the sub die is lowered and abutted on the main die, and thereafter, the upper punch, the outer lower punch, and the inner lower punch are subjected to compression molding by using an umbrella-shaped powder molded body, Molding method. 前記主ダイの浮動が、ばね、油圧、空圧のいずれかにより行われることを特徴とする請求項１に記載の傘状粉末成形体の成形方法。The method of forming an umbrella-shaped powder molded body according to claim 1, wherein the floating of the main die is performed by any of a spring, a hydraulic pressure, and a pneumatic pressure. 前記上パンチの上下動が、前記副ダイに取り付けられた流体シリンダにより行われることを特徴とする請求項１または２に記載の傘状粉末成形体の成形方法。3. The method according to claim 1, wherein the vertical movement of the upper punch is performed by a fluid cylinder attached to the sub die. コアロッドと、成形体の外径面に対応する型面を有する浮動式の主ダイと、前記主ダイに対して上下動可能に嵌合し、内径が成形体のボス部外径に対応する中空状の外下パンチと、前記コアロッドおよび前記外下パンチに対して上下動可能に嵌合する中空状の内下パンチと、成形体の外径面、歯面および上面に対応する型面を有し、前記主ダイの上面に対して離接可能な副ダイと、前記副ダイに対して上下動可能に嵌合し、成形体の上面に対応する型面を有する上パンチとを備えることを特徴とする傘状粉末成形体の成形装置。A core rod, a floating main die having a mold surface corresponding to an outer diameter surface of the molded body, and a hollow which is vertically movably fitted to the main die, and whose inner diameter corresponds to the outer diameter of the boss portion of the molded body. An outer lower punch having a shape, a hollow inner lower punch which is vertically movably fitted to the core rod and the outer lower punch, and a mold surface corresponding to an outer diameter surface, a tooth surface and an upper surface of the molded body. A secondary die detachable from the upper surface of the main die, and an upper punch having a mold surface corresponding to the upper surface of the molded body, the upper die being movably fitted to the auxiliary die. A molding device for forming an umbrella-shaped powder compact.
JP2003094515A 2003-03-31 2003-03-31 Method for forming umbrella-shaped powder compact Expired - Fee Related JP4443847B2 (en)

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CN102000818A (en) * 2010-10-14 2011-04-06 浙江恒成硬质合金有限公司 Mould for compacting hard alloy button
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JP2016160498A (en) * 2015-03-03 2016-09-05 三木プーリ株式会社 Apparatus and method for manufacturing sintered part
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CN102000818A (en) * 2010-10-14 2011-04-06 浙江恒成硬质合金有限公司 Mould for compacting hard alloy button
CN103464616A (en) * 2013-08-01 2013-12-25 浙江恒成硬质合金有限公司 Split mould
CN103624254A (en) * 2013-11-01 2014-03-12 横店集团东磁股份有限公司 Thin-wall type powder metallurgy forming die and method
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