JP4840238B2 - Manufacturing method of flanged member and work member used therefor - Google Patents

Manufacturing method of flanged member and work member used therefor Download PDF

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JP4840238B2
JP4840238B2 JP2007110887A JP2007110887A JP4840238B2 JP 4840238 B2 JP4840238 B2 JP 4840238B2 JP 2007110887 A JP2007110887 A JP 2007110887A JP 2007110887 A JP2007110887 A JP 2007110887A JP 4840238 B2 JP4840238 B2 JP 4840238B2
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flange
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將木 中島
慎二 新井
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Aisin AW Co Ltd
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Description

本発明は、底付きの円筒部が形成されると共に該円筒部の外周にフランジ部が形成されてなるフランジ付き部材を冷間鍛造を用いて製造するフランジ付き部材の製造方法およびこれに用いられるワーク部材に関する。   INDUSTRIAL APPLICABILITY The present invention is a flanged member manufacturing method for manufacturing a flanged member in which a bottomed cylindrical portion is formed and a flange portion is formed on the outer periphery of the cylindrical portion using cold forging. The present invention relates to a work member.

従来より、底付の円筒部が形成されると共にこの円筒部の外周にフランジ部が形成されたフランジ付き部材が様々な場面で使用されている。その一例として、入力軸が接続されたプライマリープーリと出力軸が接続されたセカンダリープーリとに金属製のベルトが巻き架けられたベルト式の無段変速機（ＣＶＴ）に用いられるプーリのシーブを挙げることができる（例えば、特許文献１参照）。この無段変速機では、プライマリープーリは入力軸が接続された固定シーブと固定シーブに対して軸方向に移動可能な可動シーブとから形成され、セカンダリープーリもプライマリープーリと同様に出力軸に接続された固定シーブと可動シーブとにより形成されており、アクチュエータにより可動シーブを駆動して固定シーブと可動シーブとの間隔を変更することにより、入力軸に入力された動力を変速比を無段階に変更して出力軸に出力する。
特開昭５８−９４６６３号公報 Conventionally, a flanged member in which a bottomed cylindrical portion is formed and a flange portion is formed on the outer periphery of the cylindrical portion has been used in various situations. One example is a sheave of a pulley used in a belt-type continuously variable transmission (CVT) in which a metal belt is wound around a primary pulley to which an input shaft is connected and a secondary pulley to which an output shaft is connected. (For example, refer to Patent Document 1). In this continuously variable transmission, the primary pulley is formed of a fixed sheave to which the input shaft is connected and a movable sheave that is movable in the axial direction with respect to the fixed sheave. The secondary pulley is also connected to the output shaft in the same manner as the primary pulley. It is formed by a fixed sheave and a movable sheave. By changing the distance between the fixed sheave and the movable sheave by driving the actuator, the power ratio input to the input shaft is changed continuously. And output to the output shaft.
JP 58-94663 A

こうした無段変速機に用いられるシーブなどのフランジ付き部材の製造は、冷間鍛造を用いて行なうことができる。ここで、冷間鍛造は、熱間鍛造に比して成形精度を良好なものとすることができるものの、その成形荷重は熱間鍛造に比べて数倍となるため、通常はワーク部材には冷間鍛造が適切に行なわれるよう潤滑処理などの前処理が施される。このとき、ワーク部材に余分な油やカスが付着していると、ワーク部材の形状や油やカスの付着場所によってはプレス加工の際に欠肉となって現われる場合が生じるから、これに対して適切な対策を施すことが求められる。   Production of a flanged member such as a sheave used in such a continuously variable transmission can be performed by cold forging. Here, although cold forging can improve the forming accuracy compared to hot forging, its forming load is several times that of hot forging. Pretreatment such as lubrication is performed so that cold forging is performed appropriately. At this time, if excessive oil or debris is attached to the work member, depending on the shape of the work member or the place where the oil or debris is attached, it may appear as a thin wall during press processing. Therefore, it is necessary to take appropriate measures.

本発明のフランジ付き部材の製造方法およびこれに用いられるワーク部材は、ワーク部材から冷間鍛造を用いて製造されるフランジ付き部材の成形不良の発生を抑制することを主目的とする。   The manufacturing method of the member with a flange of this invention and the workpiece member used for this make it a main purpose to suppress generation | occurrence | production of the shaping | molding defect of the member with a flange manufactured using cold forging from a workpiece member.

本発明のフランジ付き部材の製造方法およびこれに用いられるワーク部材は、上述した主目的を達成するために以下の手段を採った。   In order to achieve the main object described above, the flanged member manufacturing method of the present invention and the work member used therein employ the following means.

本発明のフランジ付き部材の製造方法は、
底付きの円筒部が形成されると共に該円筒部の外周にフランジ部が形成されてなるフランジ付き部材を冷間鍛造を用いて製造するフランジ付き部材の製造方法であって、
（ａ）円柱端面の中心に形成された第１凹部と該第１凹部の底部に形成された第２凹部とを有する円柱状のワーク部材を形成し、
（ｂ）前記ワーク部材の第１凹部に嵌合して該第１凹部の底部を押圧可能な凸部と該凸部の外周を囲むよう該凸部の外径よりも大きい径の内径をもって該凸部との間で環状の空間を形成し該ワーク部材の円柱端面を押圧可能な凹部とを有する金型を用いて該金型を該ワーク部材の円柱端面に押し当てることにより前記円筒部と前記フランジ部とを形成する
ことを要旨とする。 The manufacturing method of the flanged member of the present invention is as follows.
A flanged member manufacturing method for manufacturing a flanged member in which a bottomed cylindrical portion is formed and a flange portion is formed on the outer periphery of the cylindrical portion using cold forging,
(A) forming a cylindrical work member having a first recess formed at the center of the cylinder end surface and a second recess formed at the bottom of the first recess;
(B) a convex portion that fits into the first concave portion of the work member and presses the bottom of the first concave portion, and has an inner diameter that is larger than the outer diameter of the convex portion so as to surround the outer periphery of the convex portion. The cylindrical portion is formed by pressing the mold against the column end surface of the work member using a mold having an annular space between the convex portion and a recess capable of pressing the column end surface of the work member. The gist is to form the flange portion.

この本発明のフランジ付き部材の製造方法によれば、ワーク部材を円柱端面の中心に形成された第１凹部と該第１凹部の底部に形成された第２凹部とを有する円柱状の部材として形成し、ワーク部材の第１凹部に嵌合して第１凹部の底部を押圧可能な凸部とこの凸部の外周を囲むよう凸部の外径よりも大きい径の内径をもって凸部との間で環状の空間を形成しワーク部材の円柱端面を押圧可能な凹部とを有する金型を用いて金型をワーク部材の円柱端面に押し当てることにより円筒部とフランジ部とを形成する。したがって、工程プロセス中にワーク部材に第１凹部内に余分なカスや油などが付着している場合、第１凹部に金型の凸部が嵌合してプレス加工されたときに第１凹部の底部に形成された第２凹部をカス溜まりとして機能させることができる。この結果、第１凹部に付着した余分な油やカスなどに起因する欠肉などの発生を抑制することができ、フランジ付き部材の成形不良の発生を抑制することができる。   According to this flanged member manufacturing method of the present invention, the work member is a cylindrical member having a first recess formed at the center of the cylinder end surface and a second recess formed at the bottom of the first recess. A convex portion that can be formed and fitted into the first concave portion of the work member and presses the bottom of the first concave portion, and the convex portion has an inner diameter larger than the outer diameter of the convex portion so as to surround the outer periphery of the convex portion. A cylindrical portion and a flange portion are formed by pressing the die against the column end surface of the work member using a die having a ring space between them and having a recess capable of pressing the column end surface of the work member. Therefore, when excessive debris, oil, or the like adheres to the work member in the first recess during the process, the first recess when the convex portion of the mold is fitted into the first recess and pressed. The 2nd recessed part formed in the bottom part of can be made to function as a residue pool. As a result, it is possible to suppress the occurrence of thinning due to excess oil or residue attached to the first recess, and it is possible to suppress the occurrence of defective molding of the flanged member.

こうした本発明のフランジ付き部材の製造方法において、前記金型は、前記円筒部の底が前記フランジ部における該円筒部の開口側の面（フランジ面）よりも深くなるよう形成されてなるものとすることもできる。円柱端面に第１凹部を設けたワーク部材を用いてフランジ部とフランジ面よりも深い底の円筒部とを形成するから、円柱端面に第１凹部を設けないワーク部材を用いるものに比して大きな変形を付与して円筒部を成形することができ、フランジ面よりも深い底の円筒部を比較的高く伸ばすことができる。   In such a flanged member manufacturing method of the present invention, the mold is formed so that the bottom of the cylindrical portion is deeper than the surface of the flange portion on the opening side (flange surface) of the cylindrical portion. You can also Since the workpiece member having the first concave portion on the cylindrical end surface is used to form the flange portion and the cylindrical portion having a bottom deeper than the flange surface, compared to a workpiece member that does not have the first concave portion on the cylindrical end surface. The cylindrical portion can be formed by applying a large deformation, and the cylindrical portion at the bottom deeper than the flange surface can be stretched relatively high.

また、本発明のフランジ付き部材の製造方法において、前記工程（ｂ）は、冷間鍛造により前記円筒部の内壁に回転軸を接続するための歯形溝を形成する工程（ｂ１）を備えるものとすることもできる。円筒部に欠肉などの不具合が発生していると、円筒部に歯形溝を形成したときに不具合の影響が歯形溝にも現われ、この歯形溝に回転軸が接続されて回転軸が駆動されると破損などが生じる場合があるが、本発明では、第１凹部の底部に第２凹部を設けたワーク部材を用いてフランジ付き部材を形成することにより円筒部に欠肉などの不具合が発生するのを抑制するから、円筒部に歯形溝を形成したときに歯形溝に不具合が生じるのを抑制することができる。この結果、歯形溝に接続される回転軸からの回転トルク負荷に対する強度低下を抑制することができる。   Moreover, in the manufacturing method of the member with a flange of the present invention, the step (b) includes a step (b1) of forming a tooth profile groove for connecting a rotating shaft to the inner wall of the cylindrical portion by cold forging. You can also If there is a defect such as lack of thickness in the cylindrical part, the influence of the defect appears in the tooth groove when the tooth groove is formed in the cylindrical part, and the rotation shaft is connected to the tooth groove and the rotation shaft is driven. However, in the present invention, a flanged member is formed using a work member provided with a second recess at the bottom of the first recess, thereby causing a problem such as a lack of thickness in the cylindrical portion. Therefore, when a tooth profile groove is formed in the cylindrical portion, it is possible to suppress a problem from occurring in the tooth profile groove. As a result, it is possible to suppress a decrease in strength against a rotational torque load from the rotating shaft connected to the tooth profile groove.

さらに、本発明のフランジ付き部材の製造方法において、前記工程（ｂ）は、前記円筒部の底部に潤滑用の油路を形成する工程（ｂ２）を備えるものとすることもできる。こうすれば、第２凹部が形成されたワーク部材がフランジ付き部材として形成されたときに第２凹部は除去され製品形状として残らないので、第２凹部がフランジ付き部材の機能に影響を与えることがない。   Further, in the flanged member manufacturing method of the present invention, the step (b) may include a step (b2) of forming an oil passage for lubrication at the bottom of the cylindrical portion. In this way, when the work member having the second recess is formed as a flanged member, the second recess is removed and does not remain as a product shape, so that the second recess affects the function of the flanged member. There is no.

また、本発明のフランジ付き部材の製造方法において、前記工程（ｂ）は、前記ワーク部材の前記第１凹部が形成された円柱端面を上向きにして載置した状態で前記金型によって該円柱端面を押圧することにより前記円筒部と前記フランジ部とを形成する工程であるものとすることもできる。こうすれば、第１凹部にカスや油などが付着しやすくなるから、本発明の効果がより顕著なものとなる。   Moreover, in the manufacturing method of the member with a flange of the present invention, the step (b) may be performed by the mold with the cylinder end surface on which the first recess portion of the work member is formed facing upward. It can also be a process of forming the cylindrical part and the flange part by pressing. In this way, since the residue or oil easily adheres to the first recess, the effect of the present invention becomes more remarkable.

また、本発明のフランジ付き部材の製造方法において、前記フランジ付き部材は、前記円筒部の開口側とは反対側に延伸された軸部を備える軸部材であるものとすることもできる。この場合、前記工程（ａ）は、前記第１凹部と前記第２凹部とを形成可能な金型を用いて前方押し出し成形により前記軸部を形成するものとすることもできる。こうすれば、軸部を比較的容易に形成することができ、材料歩留まりが高く、低コストでワーク部材を成形することができる。   In the method for manufacturing a flanged member of the present invention, the flanged member may be a shaft member including a shaft portion that extends to the opposite side of the opening side of the cylindrical portion. In this case, in the step (a), the shaft portion may be formed by forward extrusion molding using a mold capable of forming the first concave portion and the second concave portion. If it carries out like this, a shaft part can be formed comparatively easily, a material yield is high, and a work member can be fabricated at low cost.

また、本発明のフランジ付き部材の製造方法において、前記フランジ付き部材は、無段変速機に用いられるシーブであるものとすることもできる。無段変速機のシーブとして用いるためにフランジ付き部材の円筒部の内壁に歯形溝を形成して相手部品としての回転軸を連結するものとすれば、円筒部に欠肉などの不具合の発生を抑制することができる結果、連結部に不具合を生じさせることなく回転軸からの回転トルク負荷をより適切に伝達することができる。なお、フランジ付き部材としては、無段変速機に用いられるシーブとするものに限られず、底付きの円筒部が形成されると共に該円筒部の外周にフランジ部が形成されてなる如何なるものとしても構わない。   In the flanged member manufacturing method of the present invention, the flanged member may be a sheave used in a continuously variable transmission. If a toothed groove is formed on the inner wall of the cylindrical part of the flanged member to be used as a sheave for a continuously variable transmission and the rotating shaft as a mating part is connected, problems such as lacking in the cylindrical part will occur. As a result of being able to suppress, the rotational torque load from a rotating shaft can be transmitted more appropriately, without causing a malfunction in a connection part. The flanged member is not limited to a sheave used in a continuously variable transmission, and may be any member in which a bottomed cylindrical portion is formed and a flange portion is formed on the outer periphery of the cylindrical portion. I do not care.

本発明のワーク部材は、
底付きの円筒部が形成されると共に該円筒部の外周にフランジ部が形成されてなるフランジ付き部材を冷間鍛造を用いて製造する際に用いられる円柱状のワーク部材であって、
前記ワーク部材は、円柱端面の中心に形成された第１凹部と該第１凹部の底部に形成された第２凹部とを有する部材であり、
前記ワーク部材の第１凹部に嵌合して該第１凹部の底部を押圧可能な凸部と該凸部の外周を囲むよう該凸部の外径よりも大きい径の内径をもって該凸部との間で環状の空間を形成し該ワーク部材の円柱端面を押圧可能な凹部とを有する金型を用いて該金型が該ワーク部材の円柱端面に押し当てられることにより前記円筒部と前記フランジ部とが形成される
ことを要旨とする。 The workpiece of the present invention is
A cylindrical work member used when manufacturing a flanged member in which a bottomed cylindrical part is formed and a flange part is formed on the outer periphery of the cylindrical part using cold forging,
The work member is a member having a first recess formed at the center of a cylindrical end surface and a second recess formed at the bottom of the first recess,
A convex portion that fits into the first concave portion of the workpiece member and can press the bottom of the first concave portion, and an inner diameter that is larger than the outer diameter of the convex portion so as to surround the outer periphery of the convex portion, The cylindrical portion and the flange are formed by pressing the die against the cylindrical end surface of the work member using a die having an annular space between them and a recess capable of pressing the cylindrical end surface of the work member. The point is that the part is formed.

この本発明のワーク部材では、ワーク部材を円柱端面の中心に形成された第１凹部と該第１凹部の底部に形成された第２凹部とを有する円柱状の部材として形成し、ワーク部材の第１凹部に嵌合して第１凹部の底部を押圧可能な凸部とこの凸部の外周を囲むよう凸部の外径よりも大きい径の内径をもって凸部との間で環状の空間を形成しワーク部材の円柱端面を押圧可能な凹部とを有する金型を用いて金型がワーク部材の円柱端面に押し当てられることにより円筒部とフランジ部とが形成される。したがって、工程プロセス中にワーク部材に第１凹部内に余分なカスや油などが付着している場合、第１凹部に金型の凸部が嵌合してプレス加工されたときに第１凹部の底部に形成された第２凹部をカス溜まりとして機能させることができる。この結果、第１凹部に付着した余分な油やカスなどに起因する欠肉などの発生を抑制することができ、フランジ付き部材の成形不良の発生を抑制することができる。   In the workpiece member of the present invention, the workpiece member is formed as a columnar member having a first recess formed at the center of the cylinder end surface and a second recess formed at the bottom of the first recess, An annular space is formed between the convex portion that fits into the first concave portion and can press the bottom of the first concave portion and has an inner diameter larger than the outer diameter of the convex portion so as to surround the outer periphery of the convex portion. A cylindrical part and a flange part are formed by pressing the mold against the columnar end surface of the work member using a mold that is formed and having a recess capable of pressing the columnar end surface of the workpiece member. Therefore, when excessive debris, oil, or the like adheres to the work member in the first recess during the process, the first recess when the convex portion of the mold is fitted into the first recess and pressed. The 2nd recessed part formed in the bottom part of can be made to function as a residue pool. As a result, it is possible to suppress the occurrence of thinning due to excess oil or residue attached to the first recess, and it is possible to suppress the occurrence of defective molding of the flanged member.

次に、本発明を実施するための最良の形態を実施例を用いて説明する。   Next, the best mode for carrying out the present invention will be described using examples.

図１は本発明の一実施例としてのフランジ付き部材の製造方法によって製造されたシーブ２０の外観を示す外観図であり、図２は図１のシーブ２０のＡ−Ａ断面を示す断面図であり、図３は無段変速機１０の構成の概略を示す構成図である。無段変速機１０は、図３に示すように、回転軸１１が接続された固定シーブとしてのシーブ２０とシーブ２０に対して軸方向に移動可能な可動シーブとからなるプライマリープーリ１２と、回転軸１３に接続された固定シーブとこの固定シーブに対して軸方向に移動可能な可動シーブとからなるセカンダリープーリ１４と、プライマリープーリ１２とセカンダリープーリ１４とに架け渡されたベルト１６とを備えるベルト式の無段変速機として構成されている。この無段変速機１０に用いられるシーブ（図３中のプライマリープーリ１２の固定シーブ）２０は、図１および図２に示すように、回転軸１１が接続される円筒状のボス部２２と、ボス部２２の外周に形成されたフランジ部２４と、フランジ部２４におけるボス部２２とは反対の面に形成された軸部２６とからなっている。なお、図２に示すように、シーブ２０のボス部２２や軸部２６は、無段変速機１０として組み込んだときにシーブ２０や他の機械部分を潤滑するための油路２９が形成されている。以下、このシーブ２０を製造する製造工程について説明する。   FIG. 1 is an external view showing an appearance of a sheave 20 manufactured by a method for manufacturing a flanged member as one embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a cross section AA of the sheave 20 of FIG. FIG. 3 is a block diagram showing an outline of the configuration of the continuously variable transmission 10. As shown in FIG. 3, the continuously variable transmission 10 includes a primary pulley 12 including a sheave 20 as a fixed sheave to which a rotating shaft 11 is connected, and a movable sheave that is movable in the axial direction with respect to the sheave 20. A belt comprising a secondary sheave 14 comprising a fixed sheave connected to the shaft 13 and a movable sheave movable in the axial direction relative to the fixed sheave, and a belt 16 spanned between the primary pulley 12 and the secondary pulley 14. It is configured as a continuously variable transmission of the type. As shown in FIGS. 1 and 2, a sheave (fixed sheave of the primary pulley 12 in FIG. 3) 20 used in the continuously variable transmission 10 includes a cylindrical boss portion 22 to which the rotary shaft 11 is connected, The flange portion 24 is formed on the outer periphery of the boss portion 22, and the shaft portion 26 is formed on the surface of the flange portion 24 opposite to the boss portion 22. As shown in FIG. 2, the boss portion 22 and the shaft portion 26 of the sheave 20 are formed with an oil passage 29 for lubricating the sheave 20 and other mechanical portions when incorporated as the continuously variable transmission 10. Yes. Hereinafter, a manufacturing process for manufacturing the sheave 20 will be described.

図４は、シーブ２０を製造する工程の一例を示す製造工程図である。シーブ２０は、図示するように、まず、粗材２０Ａに対して所定の前処理を施す（工程Ｓ１００）。図５に粗材２０Ａの外観を示す外観図を示す。粗材２０Ａは、図示するように、円柱状の部材として形成されており、低炭素鋼や低炭素合金鋼，アルミニウム，アルミニウム合金，銅，銅合金などの冷間鍛造が可能な材料が用いられている。この粗材２０Ａに対して施す所定の前処理は、後工程で冷間鍛造を適切に行なうための処理であり、軟化焼鈍やショットブラスト、ボンデ処理など挙げることができる。なお、ショットブラストは、無数の砥粒を高速噴射して材料表面のスケールの除去や表面研掃を行なう処理である。また、ボンデ処理は、材料表面の摩擦係数を小さくするための潤滑処理であり、例えば、材料の表面に化成皮膜（例えば、燐酸塩皮膜など）を形成すると共にこの化成皮膜の表面を金属石けんなどによりコーティングすることにより行なわれる。   FIG. 4 is a manufacturing process diagram showing an example of a process for manufacturing the sheave 20. As shown in the figure, the sheave 20 first performs a predetermined pretreatment on the coarse material 20A (step S100). FIG. 5 is an external view showing the external appearance of the coarse material 20A. As shown in the figure, the coarse material 20A is formed as a cylindrical member, and a material that can be cold forged such as low carbon steel, low carbon alloy steel, aluminum, aluminum alloy, copper, copper alloy, or the like is used. ing. The predetermined pretreatment applied to the coarse material 20A is a treatment for appropriately performing cold forging in a subsequent process, and examples thereof include softening annealing, shot blasting, and bondage treatment. Note that shot blasting is a process of removing scales on the surface of the material and performing surface polishing by spraying countless abrasive grains at high speed. Bonding is a lubrication treatment for reducing the coefficient of friction of the material surface. For example, a chemical conversion film (for example, a phosphate film) is formed on the surface of the material, and the surface of the chemical conversion film is made of metal soap. Is performed by coating.

次に、粗材２０Ａに対して冷間鍛造による軸絞り加工を施してワーク部材２０Ｂを形成する（工程Ｓ１１０）。図６は軸絞り成形に用いられるプレス機３０の構成の概略を示す構成図であり、図７はプレス機３０によって形成されるワーク部材２０Ｂの外観を示す外観図であり、図８は図７のワーク部材２０ＢのＢ−Ｂ断面を示す断面図である。軸絞り成形によって得られるワーク部材２０Ｂは、図７および図８に示すように、粗材２０Ａの断面と略同一の断面を有する円柱状の頭部２２Ｂと、頭部２２Ｂの断面積よりも小さな断面積に絞られている円柱状の軸部２４Ｂとにより形成されている。頭部２２Ｂの頂面（円柱端面）の中心には、断面が円状の穴部２６Ｂが形成されており、穴部２６Ｂの底には穴部２６Ｂよりも小さな断面が円状の凹部２８Ｂが形成されている。この凹部２８Ｂを形成する理由については後述する。こうしたワーク部材２０を形成するプレス機３０は、図６に示すように、固定盤３１に固定されたボルスタ３２と、図示しないスライド駆動部の駆動によりボルスタ３２に対して上下動可能なスライド３４と、ボルスタ３２に固定され粗材２０Ａの断面形状と略同一の断面形状の空間が形成されて粗材２０Ａを遊びがない状態で収容可能な収容部３６ａとこの収容部３６ａの下部に形成され下方に進むほど断面積が徐々に小さくなる空間が形成された徐変部３６ｂとこの徐変部３６ｂの下部に形成され収容部３６ａの断面積（径Ｄ）よりも小さな断面積（径ｄ）の円柱状の空間が形成された軸絞り部３６ｃとを有する下型３６と、スライド３４に固定され粗材２０Ａの円柱端面と略同一の断面形状を有し中央に断面が円状の突起３８ａが形成されると共に突起３８ａの先端に断面が円状の凸部３８ｂが形成されたパンチ３８ｃを有する上型３８とを備え、粗材２０Ａを下型３６の収容部３６ａに収容した状態でスライド駆動部によってスライド３４を駆動してパンチ３８ｃを粗材２０Ａに押し当てることによりワーク部材２０Ｂを形成する。こうした加工は、下型３６に粗材２０Ａを密閉し、パンチ３８ｃの進む方向に粗材２０Ａの材料を流動させて、下型３６の軸絞り部３６ｃを通して材料の断面積を減少させるものであるから、前方押し出し加工と考えることができる。   Next, the workpiece 20B is formed by subjecting the coarse material 20A to shaft drawing by cold forging (step S110). FIG. 6 is a block diagram showing an outline of the configuration of the press machine 30 used for shaft drawing, FIG. 7 is an external view showing the external appearance of a work member 20B formed by the press machine 30, and FIG. It is sectional drawing which shows the BB cross section of the workpiece member 20B. As shown in FIGS. 7 and 8, the workpiece member 20B obtained by the axial drawing is smaller than the cross-sectional area of the columnar head portion 22B having substantially the same cross section as the rough material 20A and the head portion 22B. It is formed of a cylindrical shaft portion 24B that is narrowed in cross-sectional area. A hole 26B having a circular cross section is formed at the center of the top surface (cylindrical end surface) of the head portion 22B, and a recess 28B having a circular cross section smaller than the hole 26B is formed at the bottom of the hole 26B. Is formed. The reason for forming the recess 28B will be described later. As shown in FIG. 6, the press machine 30 forming such a work member 20 includes a bolster 32 fixed to a fixed platen 31, and a slide 34 that can move up and down with respect to the bolster 32 by driving a slide drive unit (not shown). A space 36a that is fixed to the bolster 32 and has a cross-sectional shape that is substantially the same as the cross-sectional shape of the coarse material 20A is formed so that the coarse material 20A can be accommodated without play, and is formed below the housing portion 36a. Gradually changing portion 36b formed with a space where the cross-sectional area gradually decreases as it proceeds to, and a cross-sectional area (diameter d) smaller than the cross-sectional area (diameter D) of the accommodating portion 36a formed below this gradual changing portion 36b. A lower die 36 having a shaft restricting portion 36c in which a cylindrical space is formed, and a protrusion 38a that is fixed to the slide 34 and has substantially the same cross-sectional shape as the cylindrical end surface of the coarse material 20A and has a circular cross section in the center. Formation And an upper die 38 having a punch 38c in which a convex portion 38b having a circular cross section is formed at the tip of the protrusion 38a, and the coarse material 20A is accommodated in the accommodating portion 36a of the lower die 36 by the slide driving portion. The work member 20B is formed by driving the slide 34 and pressing the punch 38c against the coarse material 20A. In such processing, the coarse material 20A is sealed in the lower die 36, and the material of the coarse material 20A is caused to flow in the direction in which the punch 38c advances, thereby reducing the cross-sectional area of the material through the shaft restricting portion 36c of the lower die 36. Therefore, it can be considered as a forward extrusion process.

こうしてワーク部材２０Ｂを形成すると、ワーク部材２０Ｂに対して冷間鍛造による据え込み加工を施してフランジ付き部材２０Ｃを形成する（工程Ｓ１２０）。図９は据え込み加工に用いられるプレス機４０の構成の概略を示す構成図であり、図１０はプレス機４０によって形成されるフランジ付き部材２０Ｃの外観を示す外観図であり、図１１は図１０のフランジ付き部材２０ＣのＣ−Ｃ断面を示す断面図である。据え込み加工によって得られるフランジ付き部材２０Ｃは、図１０および図１１に示すように、底付きの円筒部２２Ｃと、円筒部２２Ｃの外周に形成されたフランジ部２４Ｃと、円筒部２２Ｃの軸中心と同軸でフランジ部２４Ｃにおける円筒部２２Ｃとは反対側に延伸された軸部２６とにより形成されている。こうしたフランジ付き部材２０Ｃを形成するプレス機４０は、図示するように、固定盤４１に固定されたボルスタ４２と、図示しないスライド駆動部の駆動によりボルスタ４２に対して上下動可能なスライド４４と、ボルスタ４２に固定されワーク部材２０Ｂの軸部２４Ｂの断面形状と略同一の断面形状の空間が形成されてワーク部材２０Ｂの軸部２４Ｂを遊びがない状態で収容可能な収容部４６ａとこの収容部４６ａの下部に形成され収容部４６ａの断面積よりも小さな断面積の円柱状の空間が形成された軸絞り部４６ｂとワーク部材２０Ｂを頭部２２Ｂの底面から押圧可能な押圧面４６ｃとを有する下型４４と、スライド４４に固定されワーク部材２０Ｂの穴部２６Ｂに嵌合可能な凸部４８ａと凸部４８ａの外周に環状の溝４８ｃを形成する凹部が形成された押圧面４８ｂとを有する上型４８とを備え、ワーク部材２０Ｂを下型４６の収容部４６ａに収容した状態でスライド駆動部によってスライド４４を駆動して凸部４８ａと押圧面４８ｂとをワーク部材２０Ｂに押し当てることによりフランジ付き部材２０Ｃを形成する。プレス機４０は、図１１に示すように、フランジ付き部材２０Ｃを円筒部２２Ｃの底面がフランジ部２４Ｃの上面よりも深くなるよう形成する。こうした加工を行なう必要から、実施例では、ワーク部材２０Ｂの頭部２２Ｂの頂面に穴部２６Ｂを設けている。   When the workpiece member 20B is thus formed, the workpiece member 20B is subjected to upsetting by cold forging to form the flanged member 20C (step S120). FIG. 9 is a block diagram showing an outline of the configuration of the press machine 40 used for upsetting, FIG. 10 is an external view showing the external appearance of a flanged member 20C formed by the press machine 40, and FIG. It is sectional drawing which shows CC cross section of 20 C of members with a flange. As shown in FIGS. 10 and 11, the flanged member 20C obtained by the upsetting process includes a bottomed cylindrical portion 22C, a flange portion 24C formed on the outer periphery of the cylindrical portion 22C, and the axial center of the cylindrical portion 22C. And a shaft portion 26 extending in the opposite direction to the cylindrical portion 22C in the flange portion 24C. As shown in the figure, the press machine 40 that forms the flanged member 20C includes a bolster 42 fixed to a fixed platen 41, a slide 44 that can move up and down with respect to the bolster 42 by driving a slide drive unit (not shown), An accommodation portion 46a which is fixed to the bolster 42 and has a space having a cross-sectional shape substantially the same as the cross-sectional shape of the shaft portion 24B of the work member 20B, and can accommodate the shaft portion 24B of the work member 20B without play. A shaft restricting portion 46b formed in a lower portion of 46a and formed with a cylindrical space having a cross-sectional area smaller than that of the accommodating portion 46a, and a pressing surface 46c capable of pressing the work member 20B from the bottom surface of the head portion 22B. An annular groove 48c is formed on the outer periphery of the lower die 44, a convex portion 48a that is fixed to the slide 44 and can be fitted into the hole 26B of the work member 20B, and the convex portion 48a. And an upper die 48 having a pressing surface 48b formed with a concave portion, and the slide drive portion drives the slide 44 in a state where the work member 20B is accommodated in the accommodating portion 46a of the lower die 46, thereby pressing the convex portion 48a. The flanged member 20C is formed by pressing the surface 48b against the work member 20B. As shown in FIG. 11, the press machine 40 forms the flanged member 20C such that the bottom surface of the cylindrical portion 22C is deeper than the top surface of the flange portion 24C. Since it is necessary to perform such processing, in the embodiment, a hole 26B is provided on the top surface of the head portion 22B of the work member 20B.

いま、工程Ｓ１００の前処理や工程１１０の軸絞り加工によって金属滓やボンデ滓，加工油などがワーク部材２０Ｂの穴部２６Ｂに付着している場合を考える。図１２に穴部２６Ｂの底部に凹部２８Ｂを設けたワーク部材２０Ｂを用いてプレス機４０により据え込み加工してフランジ付き部材２０Ｃを形成する様子を示し、図１３に穴部２６Ｂの底部に凹部２８Ｂを設けないワーク部材を用いてプレス機４０により据え込み加工してフランジ付き部材を形成する様子を示す。穴部２６Ｂの底部に凹部２８Ｂを設けたワーク部材２０Ｂを用いる場合には、図１２に示すように、前工程で生じた金属滓やボンデ滓，加工油などが穴部２６Ｂに付着しているときであっても、プレス機４０の凸部４８ａが穴部２６Ｂに嵌合して穴部２６Ｂの底部が押し付けられたときに凹部２８Ｂは滓溜まりとして機能し、金属滓やボンデ滓，加工油などは凹部２８Ｂに保持される。一方、穴部２６Ｂの底部に凹部２８Ｂを設けないワーク部材を用いる場合には、図１３に示すように、穴部２６Ｂに金属滓やボンデ滓，加工油などが付着していると、プレス機４０の凸部４８ａが穴部２６Ｂに嵌合して穴部２６Ｂの底部が押し付けられたときに滓や油は逃げ場をなくし、場合によっては凸部４８ｃの押圧が進んだときに欠肉となって現われる。工程Ｓ１２０でワーク部材２０Ｂを形成する際に穴部２６Ｂの底部に凹部２８Ｂを設けるのは、こうした理由に基づく。   Now, consider a case where metal slag, bond slag, processing oil, or the like is attached to the hole 26B of the work member 20B by the pretreatment in step S100 or the axial drawing process in step 110. FIG. 12 shows how the flanged member 20C is formed by the upsetting process by the press 40 using the work member 20B provided with the recess 28B at the bottom of the hole 26B, and FIG. 13 shows the recess at the bottom of the hole 26B. A state in which a flanged member is formed by upsetting by a press 40 using a work member not provided with 28B is shown. When using the work member 20B provided with the recess 28B at the bottom of the hole 26B, as shown in FIG. 12, metal flaws, bondage flaws, processing oil, etc. generated in the previous process adhere to the hole 26B. Even when the convex portion 48a of the press machine 40 is fitted into the hole portion 26B and the bottom portion of the hole portion 26B is pressed, the concave portion 28B functions as a culvert pool, and metal rivets, bond ridges, processing oil Etc. are held in the recess 28B. On the other hand, when using a work member that does not have the recess 28B at the bottom of the hole 26B, as shown in FIG. 13, if a metal punch, a bond rod, processing oil, or the like adheres to the hole 26B, a press machine When 40 convex portions 48a are fitted into the hole portion 26B and the bottom portion of the hole portion 26B is pressed, the scissors and oil disappear, and in some cases, when the pressing of the convex portion 48c progresses, the wall becomes thin. Appear. The reason why the recess 28B is provided at the bottom of the hole 26B when the work member 20B is formed in step S120 is based on these reasons.

こうしてフランジ付き部材２０Ｃが形成されると、プレス機５０を用いてフランジ付き部材２０Ｃの円筒部２２Ｃの内壁にスプライン成形を施す（工程Ｓ１３０）。図１４はスプライン成形に用いられるプレス機５０の構成の概略を示す構成図であり、図１５はプレス機５０によってスプライン成形が施されたフランジ付き部材２０Ｄの外観を示す外観図であり、図１６は図１５のフランジ付き部材２０ＤのＤ−Ｄ断面を示す断面図である。フランジ付き部材２０Ｄは、図１５および図１６に示すように、図１０のフランジ付き部材２０Ｃの円筒部２２Ｃの内壁に長さ方向に歯形溝２８Ｄが形成されたものであり、同様の歯形溝が外壁に長さ方向に形成された回転軸（シャフト）を嵌挿できるようになっている。こうしたスプライン成形を行なうプレス機５０は、図１４に示すように、固定盤５１に固定されたボルスタ５２と、図示しないスライド駆動部の駆動によりボルスタ５２に対して上下動可能なスライド５４と、ボルスタ５２に固定されフランジ付き部材２０Ｃの軸部２６Ｃを遊びがない状態で収容すると共にフランジ付き部材２０Ｃが移動しないよう支持する収容部５６ａを有する下型５６と、フランジ付き部材２０Ｃの円筒部２２Ｃに嵌合可能で外周面に長さ方向に歯形の刃部５８ａが形成されたパンチ５８ｂを有する上型５８とを備え、フランジ付き部材２０Ｃを下型５６の収容部５６ａに収容した状態でスライド駆動部によってスライド５４を駆動してパンチ５８ｂをフランジ付き部材２０Ｃの円筒部２２Ｃに押し当てることによりスプライン成形を施したフランジ付き部材２０Ｄを形成する。   When the flanged member 20C is thus formed, the press machine 50 is used to perform spline molding on the inner wall of the cylindrical portion 22C of the flanged member 20C (step S130). FIG. 14 is a block diagram showing an outline of the configuration of the press machine 50 used for spline molding, and FIG. 15 is an external view showing the outer appearance of the flanged member 20D spline-molded by the press machine 50. FIG. 16 is a cross-sectional view showing a DD cross section of the flanged member 20 </ b> D in FIG. 15. As shown in FIGS. 15 and 16, the flanged member 20 </ b> D has a tooth-shaped groove 28 </ b> D formed in the longitudinal direction on the inner wall of the cylindrical portion 22 </ b> C of the flanged member 20 </ b> C in FIG. 10. A rotary shaft (shaft) formed in the length direction can be fitted into the outer wall. As shown in FIG. 14, the press machine 50 that performs such spline forming includes a bolster 52 fixed to a fixed platen 51, a slide 54 that can be moved up and down with respect to the bolster 52 by driving a slide drive unit (not shown), and a bolster. The lower die 56 having a receiving portion 56a for holding the shaft portion 26C of the flanged member 20C fixed to 52 and supporting the flanged member 20C so as not to move, and the cylindrical portion 22C of the flanged member 20C. And an upper die 58 having a punch 58b in which a tooth-shaped blade portion 58a is formed in the lengthwise direction on the outer peripheral surface, and the slide drive is performed in a state where the flanged member 20C is accommodated in the accommodating portion 56a of the lower die 56. The slide 54 is driven by the portion to press the punch 58b against the cylindrical portion 22C of the flanged member 20C. Forming a flanged member 20D which has been subjected to line forming.

フランジ付き部材２０Ｄを形成すると、シーブ２０として無段変速機１０に組み込んだときにシーブ２０や他の機械部分を潤滑するための油路（図１の油路２９を参照）を図示しない切削加工装置によって切削加工し（工程Ｓ１４０）、フランジ付き部材２０Ｄにコーティングされている潤滑剤を除去する洗浄処理などの所定の後処理を行なって（工程Ｓ１５０）、シーブ２０が完成する。前述したように、工程Ｓ１３０でワーク部材２０Ｂの穴部２６Ｂに余分な金属滓やボンデ滓，加工油などが付着している状態でプレス機４０によってプレス加工されたときには、ワーク部材２０Ｂの穴部２２Ｂの底部に形成された凹部２８Ｂは滓溜まりとして機能する。このため、フランジ付き部材２０Ｃとして形成されたときに円筒部２２Ｃの底部に金属滓やボンデ滓，加工油，凹部２８Ｂの跡が残っている場合が考えられる。実施例では、凹部２８Ｂが形成される部位（ワーク部材２０Ｂの穴部２６Ｂの底部）は、工程Ｓ１４０で切削加工によって油路２９が形成される部位となるから、ワーク部材２０Ｂの穴部２２Ｂの底部に形成された凹部２８Ｂによって完成品が影響を受けることはない。   When the flanged member 20D is formed, an oil passage (see oil passage 29 in FIG. 1) for lubricating the sheave 20 and other mechanical parts when incorporated in the continuously variable transmission 10 as the sheave 20 is not shown. Cutting is performed by the apparatus (step S140), and predetermined post-processing such as a cleaning process for removing the lubricant coated on the flanged member 20D is performed (step S150), and the sheave 20 is completed. As described above, when the pressing is performed by the press machine 40 in the state where extra metal slag, bondage slag, processing oil, etc. are attached to the hole 26B of the work member 20B in step S130, the hole of the work member 20B. The recess 28B formed at the bottom of the 22B functions as a pool. For this reason, when formed as the flanged member 20C, there may be a case in which the traces of the metal rod, the bond rod, the processing oil, and the recess 28B remain on the bottom of the cylindrical portion 22C. In the embodiment, the part where the recess 28B is formed (the bottom part of the hole 26B of the work member 20B) is the part where the oil passage 29 is formed by cutting in step S140, and therefore the hole 22B of the work member 20B is formed. The finished product is not affected by the recess 28B formed in the bottom.

以上説明した実施例のフランジ付き部材の製造方法によれば、円柱状の粗材２０Ａから円柱端面の中心に穴部２６Ｂが設けられると共に穴部２６Ｂの底部に凹部２８Ｂが設けられたワーク部材２０Ｂを形成し、このワーク部材２０Ｂに対してプレス機４０により冷間鍛造によるプレス加工を行なうから、工程プロセスの途中でワーク部材２０Ｂの穴部２６Ｂに金属滓やボンデ滓，加工油などが付着した場合であっても、プレス機４０の凸部４８ａによって穴部２６Ｂの底部が押し付けられたときに凹部２８Ｂを滓溜まりとして機能させることができる。この結果、金属滓やボンデ滓，加工油などに起因する欠肉などの不良の発生を抑制することができる。しかも、凹部２８Ｂが形成される部位（ワーク部材２０Ｂの穴部２６Ｂの底部）を、後工程で切削加工によって油路２９が形成される部位としているから、ワーク部材２０Ｂの穴部２６Ｂの底部に形成された凹部２８Ｂによって完成品が影響を受けるのを抑制することができる。   According to the flanged member manufacturing method of the embodiment described above, the work member 20B in which the hole 26B is provided in the center of the cylindrical end surface from the columnar coarse material 20A and the recess 28B is provided in the bottom of the hole 26B. And press work by cold forging is performed on the work member 20B by the press machine 40, so that metal iron, bondage iron, processing oil, etc. adhere to the hole 26B of the work member 20B during the process. Even if it is a case, when the bottom part of the hole part 26B is pressed by the convex part 48a of the press machine 40, the recessed part 28B can be functioned as a pool. As a result, it is possible to suppress the occurrence of defects such as lacking due to metal slags, bond sledges, processing oil, and the like. And since the site | part (bottom part of the hole part 26B of the workpiece member 20B) in which the recessed part 28B is formed is made into the site | part in which the oil path 29 is formed by a cutting process by a post process, it is set in the bottom part of the hole part 26B of the workpiece member 20B. It is possible to suppress the finished product from being affected by the formed recess 28B.

実施例のフランジ付き部材の製造方法では、シーブ２０に潤滑オイルを供給するための油路をボス部２２の底部に形成するものとしたが、ボス部２２の底部には形成しないものとしても構わない。   In the manufacturing method of the flanged member of the embodiment, the oil passage for supplying the lubricating oil to the sheave 20 is formed at the bottom of the boss portion 22, but it may not be formed at the bottom of the boss portion 22. Absent.

実施例のフランジ付き部材の製造方法では、シーブ２０に軸部２６を形成するものとしたが、軸部を形成しないものとしても構わない。   In the manufacturing method of the flanged member of the embodiment, the shaft portion 26 is formed on the sheave 20, but the shaft portion may not be formed.

実施例のフランジ付き部材の製造方法では、ベルト式の無段変速機１０に用いられるシーブ２０の製造に適用して説明するものとしたが、底付きの円筒部とこの円筒部の外周にフランジ部とを備えるものであれば、如何なるフランジ付き部材の製造に適用するものとしても構わない。   In the embodiment, the flanged member manufacturing method is described as applied to the manufacture of the sheave 20 used in the belt-type continuously variable transmission 10. However, the bottomed cylindrical portion and the outer periphery of the cylindrical portion are flanged. As long as it has a portion, it may be applied to the manufacture of any flanged member.

実施例では、フランジ付き部材の製造方法の形態として説明したが、こうしたフランジ付き部材の製造方法に用いられるワーク部材の形態とするものとしても構わない。   Although the embodiment has been described as the form of the method for manufacturing the flanged member, the work member used in the method for manufacturing the flanged member may be used.

以上、本発明を実施するための最良の形態について実施例を用いて説明したが、本発明はこうした実施例に何等限定されるものではなく、発明の要旨を逸脱しない範囲内において、種々なる形態で実施し得ることは勿論である。   The best mode for carrying out the present invention has been described above with reference to the embodiments. However, the present invention is not limited to these embodiments, and various forms are possible without departing from the spirit of the invention. Of course, it can be implemented.

本発明は、自動車産業などに利用可能である。   The present invention is applicable to the automobile industry and the like.

本発明の一実施例としてのフランジ付き部材の製造方法によって製造されたシーブ２０の外観を示す外観図である。It is an external view which shows the external appearance of the sheave 20 manufactured by the manufacturing method of the member with a flange as one Example of this invention. 図１のシーブ２０のＡ−Ａ断面を示す断面図である。It is sectional drawing which shows the AA cross section of the sheave 20 of FIG. 無段変速機１０の構成の概略を示す構成図である。1 is a configuration diagram showing an outline of the configuration of a continuously variable transmission 10. FIG. シーブ２０を製造する工程の一例を示す製造工程図である。FIG. 4 is a manufacturing process diagram illustrating an example of a process for manufacturing a sheave 20. 粗材２０Ａの外観を示す外観図である。It is an external view which shows the external appearance of 20 A of coarse materials. プレス機３０の構成の概略を示す構成図である。2 is a configuration diagram illustrating an outline of a configuration of a press machine 30. FIG. プレス機３０によって形成されるワーク部材２０Ｂの外観を示す外観図である。It is an external view which shows the external appearance of the workpiece member 20B formed with the press machine 30. FIG. 図７のワーク部材２０ＢのＢ−Ｂ断面を示す断面図である。It is sectional drawing which shows the BB cross section of the workpiece | work member 20B of FIG. プレス機４０の構成の概略を示す構成図である。2 is a configuration diagram showing an outline of a configuration of a press machine 40. FIG. プレス機４０によって形成されるフランジ付き部材２０Ｃの外観を示す外観図である。It is an external view which shows the external appearance of the member 20C with a flange formed by the press machine 40. FIG. 図１０のフランジ付き部材２０ＣのＣ−Ｃ断面を示す断面図である。It is sectional drawing which shows CC cross section of the member 20C with a flange of FIG. 凹部２８Ｂが形成されたワーク部材２０Ｂをプレス機４０によりプレス加工してフランジ付き部材２０Ｃを形成する様子を示す説明図である。It is explanatory drawing which shows a mode that the workpiece member 20B in which the recessed part 28B was formed is pressed with the press machine 40, and the member 20C with a flange is formed. 凹部２８Ｂが形成されていないワーク部材をプレス機４０によりプレス加工してフランジ付き部材を形成する様子を示す説明図である。It is explanatory drawing which shows a mode that the workpiece member in which the recessed part 28B is not formed is pressed with the press machine 40, and a member with a flange is formed. プレス機５０の構成の概略を示す構成図である。2 is a configuration diagram showing an outline of the configuration of a press machine 50. FIG. プレス機５０によってスプラインが施されたフランジ付き部材２０Ｄの外観を示す外観図である。It is an external view which shows the external appearance of 20D of flanged members to which the spline was given by the press machine 50. FIG. 図１５のフランジ付き部材２０ＤのＤ−Ｄ断面を示す断面図である。It is sectional drawing which shows the DD cross section of member 20D with a flange of FIG.

符号の説明Explanation of symbols

１０ 無段変速機、１１ 回転軸、１２ プライマリープーリ、１３ 回転軸、１４ セカンダリープーリ、１６ ベルト、２０ シーブ、２０Ａ 粗材、２０Ｂ，ワーク部材、２０Ｃ，２０Ｄ フランジ付き部材、２２ ボス部、２２ａ 歯形溝、２２Ｂ 頭部、２２Ｃ，２２Ｄ 円筒部、２４，２４Ｃ，２４Ｄ フランジ部、２４Ｂ 軸部、２６，２６Ｃ，２６Ｄ 軸部、２６Ｂ 穴部、２８Ｂ 凹部、２８Ｄ 歯形溝、２９ 油路、３０，４０，５０ プレス機、３１，４１，５１ 固定盤、３２，４２，５２ ボルスタ、３４，４４，５４ スライド、３６，４６，５６ 下型、３８，４８，５８ 上型、３６ａ，４６ａ，５６ａ 収容部、３６ｂ 徐変部、３６ｃ 軸絞り部、３８ａ 突起、３８ｂ 凸部、３８ｃ パンチ、４６ｂ 軸絞り部、４６ｃ 押圧部、４８ａ 凸部 ４８ｂ 押圧部、４８ｃ 溝、５８ａ 刃部、５８ｂ パンチ。   10 continuously variable transmission, 11 rotating shaft, 12 primary pulley, 13 rotating shaft, 14 secondary pulley, 16 belt, 20 sheave, 20A rough material, 20B, work member, 20C, 20D flanged member, 22 boss, 22a tooth profile Groove, 22B Head, 22C, 22D Cylindrical part, 24, 24C, 24D Flange part, 24B Shaft part, 26, 26C, 26D Shaft part, 26B Hole part, 28B Recessed part, 28D Tooth profile groove, 29 Oil passage, 30, 40 , 50 Press machine, 31, 41, 51 Fixed platen, 32, 42, 52 Bolster, 34, 44, 54 Slide, 36, 46, 56 Lower mold, 38, 48, 58 Upper mold, 36a, 46a, 56a Housing 36b Gradual change part, 36c Shaft restricting part, 38a Protrusion, 38b Convex part, 38c Punch, 46b Shaft restricting part, 46c Pressure section, 48a protrusion 48b pressing portion, 48c grooves, 58a blade portion, 58b punch.

Claims (9)

底付きの円筒部が形成されると共に該円筒部の外周にフランジ部が形成されてなるフランジ付き部材を冷間鍛造を用いて製造するフランジ付き部材の製造方法であって、
（ａ）円柱端面の中心に形成された第１凹部と該第１凹部の底部に形成された第２凹部とを有する円柱状のワーク部材を形成し、
（ｂ）前記ワーク部材の第１凹部に嵌合して該第１凹部の底部を押圧可能な凸部と該凸部の外周を囲むよう該凸部の外径よりも大きい径の内径をもって該凸部との間で環状の空間を形成し該ワーク部材の円柱端面を押圧可能な凹部とを有する金型を用いて該金型を該ワーク部材の円柱端面に押し当てることにより前記円筒部と前記フランジ部とを形成する
フランジ付き部材の製造方法。 A flanged member manufacturing method for manufacturing a flanged member in which a bottomed cylindrical portion is formed and a flange portion is formed on the outer periphery of the cylindrical portion using cold forging,
(A) forming a cylindrical work member having a first recess formed at the center of the cylinder end surface and a second recess formed at the bottom of the first recess;
(B) a convex portion that fits into the first concave portion of the work member and presses the bottom of the first concave portion, and has an inner diameter that is larger than the outer diameter of the convex portion so as to surround the outer periphery of the convex portion. The cylindrical portion is formed by pressing the mold against the column end surface of the work member using a mold having an annular space between the convex portion and a recess capable of pressing the column end surface of the work member. The manufacturing method of the member with a flange which forms the said flange part. 前記金型は、前記円筒部の底が前記フランジ部における該円筒部の開口側の面よりも深くなるよう形成されてなる請求項１記載のフランジ付き部材の製造方法。   2. The method for manufacturing a flanged member according to claim 1, wherein the mold is formed so that a bottom of the cylindrical portion is deeper than a surface of the flange portion on an opening side of the cylindrical portion. 前記工程（ｂ）は、冷間鍛造により前記円筒部の内壁に回転軸を接続するための歯形溝を形成する工程（ｂ１）を備える請求項１または２記載のフランジ付き部材の製造方法。   The flanged member manufacturing method according to claim 1 or 2, wherein the step (b) includes a step (b1) of forming a tooth profile groove for connecting a rotating shaft to the inner wall of the cylindrical portion by cold forging. 前記工程（ｂ）は、前記円筒部の底部に潤滑用の油路を形成する工程（ｂ２）を備える請求項１ないし３いずれか記載のフランジ付き部材の製造方法。   The said process (b) is a manufacturing method of the member with a flange in any one of Claim 1 thru | or 3 provided with the process (b2) which forms the oil path for lubrication in the bottom part of the said cylindrical part. 前記工程（ｂ）は、前記ワーク部材の前記第１凹部が形成された円柱端面を上向きにして載置した状態で前記金型によって該円柱端面を押圧することにより前記円筒部と前記フランジ部とを形成する工程である請求項１ないし４いずれか記載のフランジ付き部材の製造方法。   In the step (b), the cylindrical portion and the flange portion are pressed by pressing the cylindrical end surface with the mold in a state where the cylindrical end surface on which the first concave portion of the work member is formed is placed upward. The method for manufacturing a flanged member according to any one of claims 1 to 4, wherein the flanged member is formed. 前記フランジ付き部材は、前記円筒部の開口側とは反対側に延伸された軸部を備える軸部材である請求項１ないし５いずれか記載のフランジ付き部材の製造方法。   The method for manufacturing a flanged member according to any one of claims 1 to 5, wherein the flanged member is a shaft member including a shaft portion that extends to a side opposite to the opening side of the cylindrical portion. 前記工程（ａ）は、前記第１凹部と前記第２凹部とを形成可能な金型を用いて前方押し出し成形により前記軸部を形成する請求項６記載のフランジ付き部材の製造方法。   The method for manufacturing a flanged member according to claim 6, wherein in the step (a), the shaft portion is formed by forward extrusion molding using a mold capable of forming the first recess and the second recess. 前記フランジ付き部材は、無段変速機に用いられるシーブである請求項１ないし７いずれか記載のフランジ付き部材の製造方法。   The method for manufacturing a flanged member according to any one of claims 1 to 7, wherein the flanged member is a sheave used in a continuously variable transmission. 底付きの円筒部が形成されると共に該円筒部の外周にフランジ部が形成されてなるフランジ付き部材を冷間鍛造を用いて製造する際に用いられる円柱状のワーク部材であって、
前記ワーク部材は、円柱端面の中心に形成された第１凹部と該第１凹部の底部に形成された第２凹部とを有する部材であり、
前記ワーク部材の第１凹部に嵌合して該第１凹部の底部を押圧可能な凸部と該凸部の外周を囲むよう該凸部の外径よりも大きい径の内径をもって該凸部との間で環状の空間を形成し該ワーク部材の円柱端面を押圧可能な凹部とを有する金型を用いて該金型が該ワーク部材の円柱端面に押し当てられることにより前記円筒部と前記フランジ部とが形成される
ワーク部材。 A cylindrical work member used when manufacturing a flanged member in which a bottomed cylindrical part is formed and a flange part is formed on the outer periphery of the cylindrical part using cold forging,
The work member is a member having a first recess formed at the center of a cylindrical end surface and a second recess formed at the bottom of the first recess,
A convex portion that fits into the first concave portion of the workpiece member and can press the bottom of the first concave portion, and an inner diameter that is larger than the outer diameter of the convex portion so as to surround the outer periphery of the convex portion, The cylindrical portion and the flange are formed by pressing the die against the cylindrical end surface of the work member using a die having an annular space between them and a recess capable of pressing the cylindrical end surface of the work member. A work member on which a part is formed.
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