JP7448341B2 - Method for manufacturing a ring-shaped member and forging die used for manufacturing the ring-shaped member - Google Patents

Method for manufacturing a ring-shaped member and forging die used for manufacturing the ring-shaped member Download PDF

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JP7448341B2
JP7448341B2 JP2019214459A JP2019214459A JP7448341B2 JP 7448341 B2 JP7448341 B2 JP 7448341B2 JP 2019214459 A JP2019214459 A JP 2019214459A JP 2019214459 A JP2019214459 A JP 2019214459A JP 7448341 B2 JP7448341 B2 JP 7448341B2
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forging die
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shaped member
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JP2021084123A (en
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貞▲ス▼ 文
寧照 權
駿介 大嶋
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JATCO Ltd
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Description

本発明は、リング状部材の製造方法及びリング状部材の製造に用いられる鍛造型に関する。 The present invention relates to a method for manufacturing a ring-shaped member and a forging die used for manufacturing the ring-shaped member.

特許文献１には、穴あけポンチの位置を調整しながら成形を行うことで、型が耐え得る程度の低い荷重でリング状部材の鍛造を行うことが開示されている。 Patent Document 1 discloses that by performing forming while adjusting the position of a hole punch, a ring-shaped member is forged with a load as low as the die can withstand.

特開昭５８－９３５３９号公報Japanese Unexamined Patent Publication No. 58-93539

上記の方法では、複雑な制御を行うことが可能なプレス装置が必要となり、結果として部品のコストも高くなるという問題がある。 The above method requires a press device that can perform complicated control, resulting in a problem that the cost of the parts increases.

本発明は、このような技術的課題に鑑みてなされたもので、一般的なプレス装置を用いつつ、リング状部材を製造する際の鍛造加工の成形荷重を抑制できるようにすることを目的とする。 The present invention was made in view of such technical problems, and an object of the present invention is to suppress the forming load during forging when manufacturing a ring-shaped member while using a general press device. do.

本発明のある態様によれば、リング状部材の製造方法であって、鍛造型の外周側隅部まで素材を充填し、余剰の前記素材を前記鍛造型の中心側に流動させてワークの中心部に位置する円盤状で中実の中バリ部を前記鍛造型との間に空間を残して張り出させる鍛造工程と、前記ワークから前記中実の中バリ部を除去する除去工程と、を有し、前記鍛造型は、前記ワークが中心部に有する前記中実の中バリ部の基端部を押圧する位置に設けられた環状突起と、前記環状突起の内側に設けられ、プレス成形時に前記中実の中バリ部と接触せずに前記中実の中バリ部との間に閉じた前記空間を形成する有底の逃げ部と、を有する、ことを特徴とするリング状部材の製造方法が提供される。 According to an aspect of the present invention, there is provided a method for manufacturing a ring-shaped member, in which a forging die is filled with a material up to the outer peripheral corner thereof, and the surplus material is flowed toward the center of the forging die to form a center of the workpiece. a forging step in which a disk -shaped solid center burr located at the forging part extends out leaving a space between it and the forging die, and a removal step in which the solid center burr is removed from the workpiece . The forging die has an annular projection provided at a position to press the base end of the solid middle burr portion that the workpiece has at the center, and an annular projection provided inside the annular projection, and the forging die Manufacturing a ring-shaped member characterized in that it has a bottomed relief part that does not contact the middle burr part of the solid body and forms the closed space between the middle burr part of the solid body. A method is provided.

また、本発明の別の態様によれば、リング状部材の製造に用いられる鍛造型であって、固定型と可動型との少なくともいずれか一方は、ワークが中心部に有する円盤状で中実の中バリ部の基端部を押圧する位置に設けられた環状突起と、前記環状突起の内側に設けられ、プレス成形時に前記中実の中バリ部と接触せずに前記中実の中バリ部との間に閉じた空間を形成する有底の逃げ部と、を有することを特徴とする鍛造型が提供される。 According to another aspect of the present invention, in the forging die used for manufacturing the ring-shaped member, at least one of the fixed die and the movable die is a disk-shaped solid piece that the workpiece has in the center. an annular protrusion provided at a position to press the base end of the middle burr; and an annular protrusion provided inside the annular protrusion to prevent the middle burr of the solid from coming into contact with the middle burr of the solid during press molding. Provided is a forging die characterized in that it has a bottomed relief part that forms a closed space between the forging die and the bottomed relief part.

これらの態様によれば、プレス成形時に、鍛造型の外周側隅部まで素材が充填された後に余剰の素材が鍛造型の中心側に流動して中バリ部が張り出し、且つ、張り出した中バリ部と鍛造型との間に空間が残されるので、成形荷重が過度に上昇することがない。よって、これらの態様によれば、一般的なプレス装置を用いつつ、リング状部材を製造する際の鍛造加工の成形荷重を抑制できる。 According to these aspects, during press forming, after the material is filled up to the outer corner of the forging die, the surplus material flows toward the center of the forging die, causing the middle burr to overhang, and the overhanging middle burr to Since a space is left between the part and the forging die, the forming load does not increase excessively. Therefore, according to these aspects, it is possible to suppress the forming load during forging when manufacturing a ring-shaped member while using a general press device.

本発明の実施形態に係る製造方法が適用されたプーリ製造装置における部分断面図であり、第１工程を示す。1 is a partial cross-sectional view of a pulley manufacturing apparatus to which a manufacturing method according to an embodiment of the present invention is applied, showing a first step. 本発明の実施形態に係る製造方法が適用されたプーリ製造装置における部分断面図であり、第２工程を示す。It is a partial cross-sectional view of the pulley manufacturing apparatus to which the manufacturing method according to the embodiment of the present invention is applied, showing a second step. 本発明の実施形態に係る製造方法が適用されたプーリ製造装置における部分断面図であり、第３工程を示す。It is a partial cross-sectional view of the pulley manufacturing apparatus to which the manufacturing method according to the embodiment of the present invention is applied, showing a third step. 本発明の実施形態に係る製造方法が適用されたプーリ製造装置における部分断面図であり、第４工程を示す。It is a partial cross-sectional view of the pulley manufacturing apparatus to which the manufacturing method according to the embodiment of the present invention is applied, showing a fourth step. 第３工程の第１時点の状態を示す部分断面図である。FIG. 7 is a partial cross-sectional view showing the state at the first time point in the third step. 第３工程の第２時点の状態を示す部分断面図である。FIG. 7 is a partial cross-sectional view showing the state at the second time point in the third step. 第３工程の第３時点の状態を示す部分断面図である。FIG. 7 is a partial cross-sectional view showing the state at a third point in the third step. 第３工程の第４時点の状態を示す部分断面図である。FIG. 7 is a partial cross-sectional view showing the state at a fourth point in the third step.

以下、添付図面を参照しながら本発明の実施形態に係るプーリ製造装置１００について説明する。 Hereinafter, a pulley manufacturing apparatus 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

図１～図４は、プーリ製造装置１００における部分断面図であり、プーリ製造装置１００の第１工程～第４工程をそれぞれ示している。なお、各図では、中心線を挟んだ右側のみを示し、対称である左側については図示を省略している。後述する図５Ａ～図５Ｄについても同様である。 1 to 4 are partial cross-sectional views of the pulley manufacturing apparatus 100, showing the first to fourth steps of the pulley manufacturing apparatus 100, respectively. In addition, in each figure, only the right side across the center line is shown, and illustration of the symmetrical left side is omitted. The same applies to FIGS. 5A to 5D, which will be described later.

プーリ製造装置１００は、鍛造加工により無段変速機用の可動プーリ１０（図４参照）を製造する装置である。プーリ製造装置１００は、熱間鍛造用の装置であってもよいし、冷間鍛造用の装置であってもよい。また、プーリ製造装置１００は、例えば、トランスファを用いた装置としてもよいし、単工程を組み合わせて構成してもよい。 The pulley manufacturing apparatus 100 is an apparatus that manufactures a movable pulley 10 (see FIG. 4) for a continuously variable transmission by forging. The pulley manufacturing device 100 may be a hot forging device or a cold forging device. Furthermore, the pulley manufacturing apparatus 100 may be configured using, for example, a transfer or a combination of single steps.

可動プーリ１０は、図４に示すように、フランジ部１０ａを有するリング状の部材である。 As shown in FIG. 4, the movable pulley 10 is a ring-shaped member having a flange portion 10a.

以下、図１から図４を参照しながらプーリ製造装置１００で可動プーリ１０が製造される様子について説明する。なお、プーリ製造装置１００が備えるプレス装置は一般的な構成であるので、プレス装置の説明は省略する。 Hereinafter, the manner in which the movable pulley 10 is manufactured by the pulley manufacturing apparatus 100 will be described with reference to FIGS. 1 to 4. Note that the press device included in the pulley manufacturing apparatus 100 has a common configuration, so a description of the press device will be omitted.

第１工程では、円柱状の素材である第１ワーク１１を可動型３０ａ及び固定型３０ｂで構成される鍛造型３０でプレスして、樽状の第２ワーク１２を形成する。 In the first step, the first workpiece 11, which is a cylindrical material, is pressed by a forging die 30 that includes a movable die 30a and a fixed die 30b, to form a barrel-shaped second workpiece 12.

第２工程は、完成品形状に近い形状への成形を行う予備成形工程である。第２工程では、第２ワーク１２を可動型３１ａ及び固定型３１ｂで構成される鍛造型３１でプレスして、鍛造型３１の外周側に位置するフランジ部１０ａと、鍛造型３１の中心部に位置する中バリ部１０ｂと、を有する第３ワーク１３を形成する。 The second step is a preforming step in which the product is shaped into a shape close to that of the finished product. In the second step, the second workpiece 12 is pressed by a forging die 31 composed of a movable die 31a and a fixed die 31b, so that the flange portion 10a located on the outer peripheral side of the forging die 31 and the center of the forging die 31 are pressed. A third workpiece 13 having a central burr portion 10b located therein is formed.

第３工程は、完成品形状への成形を行う主成形工程である。第３工程では、第３ワーク１３を可動型３２ａ及び固定型３２ｂで構成される鍛造型３２でプレスして、各部の形状を完成品形状に成形する。これにより、第４ワーク１４が形成される。 The third step is a main forming step in which the finished product is formed. In the third step, the third work 13 is pressed by a forging die 32 composed of a movable die 32a and a fixed die 32b to shape each part into a finished product shape. As a result, the fourth work 14 is formed.

第４工程は、第４ワーク１４から中バリ部１０ｂを除去する除去工程である。第４工程では、抜き型３３により、第４ワーク１４から中バリ部１０ｂが除去される。これにより、可動プーリ１０が完成する。 The fourth step is a removal step in which the middle burr portion 10b is removed from the fourth workpiece 14. In the fourth step, the middle burr portion 10b is removed from the fourth workpiece 14 by the cutting die 33. As a result, the movable pulley 10 is completed.

ところで、本実施形態のプーリ製造装置１００では、主成形工程である第３工程（図３参照）において、中バリ部１０ｂと可動型３２ａとの間に空間Ｓを残した状態で完成品形状である第４ワーク１４の成形が完了するようになっている。 By the way, in the pulley manufacturing apparatus 100 of this embodiment, in the third step (see FIG. 3) which is the main forming step, the finished product shape is formed with a space S left between the middle burr portion 10b and the movable mold 32a. Molding of a certain fourth work 14 is now completed.

鍛造加工においては、鍛造型の内部に素材が完全に充填されると成形荷重が急激に上昇する。よって、許容荷重の大きいプレス装置が必要になり、鍛造型の耐久性も低下するという問題がある。また、結果として部品のコストも上昇することになる。 In forging, when the inside of a forging die is completely filled with material, the forming load increases rapidly. Therefore, there is a problem that a press device with a large allowable load is required, and the durability of the forging die is also reduced. Moreover, as a result, the cost of parts also increases.

鍛造加工の成形荷重を抑制する方法としては、例えば、可動型を複数に分割しておき、部分的に型の位置を調整して成形荷重をコントロールすることが考えられるが、この場合は、複雑な制御を行うことが可能なプレス装置が必要となる。 One way to suppress the forming load during forging is, for example, to divide the movable mold into multiple parts and partially adjust the position of the molds to control the forming load. A press device that can perform precise control is required.

これに対して、本実施形態では、上述したように、中バリ部１０ｂと可動型３２ａとの間に空間Ｓを残した状態で第４ワーク１４の成形を完了させることで、一般的なプレス装置を用いつつ、鍛造加工の成形荷重を抑制している。 In contrast, in the present embodiment, as described above, by completing the molding of the fourth work 14 with the space S remaining between the middle burr portion 10b and the movable mold 32a, it is possible to While using the equipment, the forming load of forging process is suppressed.

以下、第３工程について、図５Ａ～図５Ｄを参照しながら詳しく説明する。 The third step will be described in detail below with reference to FIGS. 5A to 5D.

図５Ａは、第３工程においてプレス成形が開始される直前である第１時点の状態を示す部分断面図である。図５Ｂは、第３工程においてプレス成形が開始された後である第２時点の状態を示す部分断面図である。図５Ｃは、第３工程において第２時点の後である第３時点の状態を示す部分断面図である。図５Ｄは、第３工程においてプレス成形が完了した第４時点の状態を示す部分断面図である。 FIG. 5A is a partial cross-sectional view showing the state at the first point in time, which is just before press forming is started in the third step. FIG. 5B is a partial cross-sectional view showing the state at a second point in time, which is after press forming is started in the third step. FIG. 5C is a partial cross-sectional view showing the state at a third time point after the second time point in the third step. FIG. 5D is a partial cross-sectional view showing the state at the fourth point in time when press forming is completed in the third step.

第３工程の鍛造加工は、上述したように、可動型３２ａ及び固定型３２ｂで構成される鍛造型３２によって行われる。 As described above, the forging process in the third step is performed using the forging die 32 that includes the movable die 32a and the fixed die 32b.

可動型３２ａは、図５Ａに示すように、第３ワーク１３が中心部に有する中バリ部１０ｂの基端部を押圧する位置に設けられた環状突起３２ｃと、環状突起３２ｃの内側に設けられた逃げ部としての凹部３２ｄと、を有する。凹部３２ｄは、開口端側に向けて拡がって形成される。つまり、凹部３２ｄは、すり鉢状に形成されている。 As shown in FIG. 5A, the movable mold 32a includes an annular projection 32c provided at a position to press the base end of the middle burr portion 10b that the third work 13 has at the center, and an annular projection 32c provided inside the annular projection 32c. It has a recessed part 32d as a relief part. The recessed portion 32d is formed to expand toward the open end side. That is, the recessed portion 32d is formed in a mortar shape.

プレス成形が開始されて可動型３２ａが下降すると、図５Ｂに示すように、可動型３２ａ及び固定型３２ｂによって第３ワーク１３が圧縮され、素材が流動して可動型３２ａ及び固定型３２ｂの形状に沿うように第３ワーク１３が変形する。 When press forming is started and the movable mold 32a descends, the third workpiece 13 is compressed by the movable mold 32a and the fixed mold 32b, and the material flows, changing the shape of the movable mold 32a and the fixed mold 32b, as shown in FIG. 5B. The third work 13 is deformed along.

このとき、白抜きの矢印で示すように、環状突起３２ｃから中バリ部１０ｂの基端部に押圧力が集中して伝達されて中バリ部１０ｂの基端部周辺が局部的に圧縮状態となり、鍛造型３２の中心側への素材の流動抵抗が高くなる。また、環状突起３２ｃ自体によって環状突起３２ｃの内側への素材の流動経路が狭められることでも、鍛造型３２の中心側への素材の流動抵抗が高くなる。 At this time, as shown by the white arrow, the pressing force is concentrated and transmitted from the annular protrusion 32c to the base end of the middle burr 10b, and the area around the base end of the middle burr 10b is locally compressed. , the flow resistance of the material toward the center of the forging die 32 increases. In addition, the annular projection 32c itself narrows the flow path of the material toward the inside of the annular projection 32c, which increases the flow resistance of the material toward the center of the forging die 32.

これにより、第３工程では、プレス成形が開始されると、まず、図５Ｂに実線の矢印で示すように、鍛造型３２の外周側に向けて素材が流動して鍛造型３２の外周側隅部まで素材が充填される。 As a result, in the third step, when press forming is started, the material first flows toward the outer circumferential side of the forging die 32, as shown by the solid arrow in FIG. The material is filled up to the top.

そして、鍛造型３２の外周側隅部まで素材が充填された状態から可動型３２ａがさらに下降していくと、図５Ｃに実線の矢印で示すように、余剰の素材が鍛造型３２の中心側に向けて流動する。 When the movable die 32a further descends from the state where the material is filled up to the outer corner of the forging die 32, the excess material moves toward the center of the forging die 32, as shown by the solid arrow in FIG. 5C. flow towards.

余剰の素材が鍛造型３２の中心側に向けて流動することで、図５Ｄに実線の矢印で示すように、中バリ部１０ｂが張り出して完成品形状の第４ワーク１４が形成される。 As the surplus material flows toward the center of the forging die 32, the middle burr portion 10b protrudes as shown by the solid arrow in FIG. 5D, forming the fourth workpiece 14 in the shape of a completed product.

ここで、上述したように、可動型３２ａは、環状突起３２ｃの内側に凹部３２ｄを有する。よって、第３工程のプレス成形が完了した第４時点で、張り出した中バリ部１０ｂと可動型３２ａとの間には、凹部３２ｄによって空間Ｓが形成された状態となる。そのため、第３工程では、鍛造型３２の内部に素材が完全に充填されることがなく、成形荷重が過度に上昇することがない。 Here, as described above, the movable mold 32a has the recess 32d inside the annular projection 32c. Therefore, at the fourth point in time when the press forming in the third step is completed, a space S is formed between the protruding middle burr portion 10b and the movable die 32a by the recessed portion 32d. Therefore, in the third step, the inside of the forging die 32 is not completely filled with the material, and the forming load does not increase excessively.

なお、本実施形態では、可動型３２ａに環状突起３２ｃ及び凹部３２ｄを設けているが、環状突起及び凹部を固定型３２ｂに設けてもよいし、可動型３２ａと固定型３２ｂとの両方に設けてもよい。 In this embodiment, the annular projection 32c and the recess 32d are provided in the movable mold 32a, but the annular projection and the recess may be provided in the fixed mold 32b, or in both the movable mold 32a and the fixed mold 32b. You can.

可動型３２ａに凹部３２ｄを設けた場合、つまり、可動型３２ａ側に空間Ｓが形成されるようにした場合は、プレス成形時に可動型３２ａと中バリ部１０ｂとが当接しないので、可動型３２ａの移動（下降）が中バリ部１０ｂによって妨げられることがない。よって、固定型３２ｂに凹部を設けた場合よりも成形荷重を低減できる。 When the movable mold 32a is provided with the recess 32d, that is, when the space S is formed on the movable mold 32a side, the movable mold 32a and the middle burr portion 10b do not come into contact with each other during press molding. The movement (lowering) of 32a is not hindered by the middle burr portion 10b. Therefore, the molding load can be reduced more than when the fixed mold 32b is provided with a recess.

また、本実施形態では、可動型３２ａの環状突起３２ｃが中バリ部１０ｂの基端部を押圧する位置に設けられるので、第４ワーク１４における中バリ部１０ｂの基端部の厚みが低減される。これにより、第４工程で中バリ部１０ｂを除去する際に必要な打ち抜き荷重が低減される。 Furthermore, in this embodiment, since the annular protrusion 32c of the movable die 32a is provided at a position where it presses the base end of the center burr 10b, the thickness of the base end of the center burr 10b in the fourth workpiece 14 is reduced. Ru. This reduces the punching load required when removing the middle burr portion 10b in the fourth step.

以上述べたように、本実施形態では、可動プーリ１０を製造するプーリ製造装置１００は、鍛造型３２（可動型３２ａ、固定型３２ｂ）の外周側隅部まで素材を充填し、余剰の素材を鍛造型３２の中心側に流動させて第３ワーク１３の中心部に位置する中バリ部１０ｂを鍛造型３２との間に空間Ｓを残して張り出させる鍛造工程（第３工程）と、第４ワーク１４から中バリ部１０ｂを除去する除去工程（第４工程）と、を備える。 As described above, in this embodiment, the pulley manufacturing apparatus 100 that manufactures the movable pulley 10 fills the forging mold 32 (movable mold 32a, fixed mold 32b) with the material up to the outer peripheral corner, and removes the surplus material. A forging step (third step) in which the flow is caused to flow toward the center of the forging die 32 to cause the middle burr portion 10b located at the center of the third work 13 to protrude leaving a space S between it and the forging die 32; 4, a removal step (fourth step) of removing the central burr portion 10b from the workpiece 14.

また、可動プーリ１０の製造に用いられる鍛造型３２の可動型３２ａは、第３ワーク１３が中心部に有する中バリ部１０ｂの基端部を押圧する位置に設けられた環状突起３２ｃと、環状突起３２ｃの内側に設けられ、プレス成形時に中バリ部１０ｂと接触しない凹部３２ｄと、を有する。 Furthermore, the movable die 32a of the forging die 32 used for manufacturing the movable pulley 10 has an annular protrusion 32c provided at a position to press the base end of the middle burr portion 10b that the third work 13 has at the center, and an annular protrusion 32c. It has a recessed part 32d that is provided inside the projection 32c and does not come into contact with the middle burr part 10b during press molding.

これらによれば、プレス成形時に、鍛造型３２の外周側隅部まで素材が充填された後に余剰の素材が鍛造型３２の中心側に流動して中バリ部１０ｂが張り出し、且つ、張り出した中バリ部１０ｂと鍛造型３２との間に空間Ｓが残されるので、成形荷重が過度に上昇することがない。よって、これらによれば、一般的なプレス装置を用いつつ、可動プーリ１０を製造する際の鍛造加工の成形荷重を抑制できる。（請求項１、３に対応する効果） According to these, during press forming, after the material is filled up to the outer peripheral corner of the forging die 32, the surplus material flows toward the center of the forging die 32, causing the middle burr portion 10b to protrude, and the protruding inner part to be Since the space S is left between the burr portion 10b and the forging die 32, the forming load does not increase excessively. Therefore, according to these, the forming load of the forging process when manufacturing the movable pulley 10 can be suppressed while using a general press device. (Effects corresponding to claims 1 and 3)

また、凹部３２ｄは、可動型３２ａに設けられる。すなわち、空間Ｓは、可動型３２ａ側に形成される。 Moreover, the recessed portion 32d is provided in the movable mold 32a. That is, the space S is formed on the movable mold 32a side.

これによれば、プレス成形時に可動型３２ａと中バリ部１０ｂとが当接しないので、可動型３２ａの移動（下降）が中バリ部１０ｂによって妨げられることがない。よって、固定型３２ｂに凹部を設けた場合よりも成形荷重を低減できる。（請求項２、４に対応する効果） According to this, since the movable die 32a and the middle burr part 10b do not come into contact with each other during press molding, the movement (lowering) of the movable die 32a is not hindered by the middle burr part 10b. Therefore, the molding load can be reduced more than when the fixed mold 32b is provided with a recess. (Effects corresponding to claims 2 and 4)

以上、本発明の実施形態について説明したが、上記実施形態は本発明の適用例の一つを示したものに過ぎず、本発明の技術的範囲を上記実施形態の具体的構成に限定する趣旨ではない。 Although the embodiments of the present invention have been described above, the above embodiments are merely examples of application of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiments. isn't it.

例えば、上記実施形態では、リング状部材を可動プーリ１０として説明した。しかしながら、リング状部材は、例えば、ギヤであってもよい。 For example, in the above embodiment, the ring-shaped member is described as the movable pulley 10. However, the ring-shaped member may also be a gear, for example.

１００ プーリ製造装置
１０ 可動プーリ（リング状部材）
１０ｂ 中バリ部
１３ 第３ワーク（ワーク）
１４ 第４ワーク（ワーク）
３２ 鍛造型
３２ａ 可動型
３２ｂ 固定型
３２ｃ 環状突起
３２ｄ 凹部（逃げ部）
Ｓ 空間 100 Pulley manufacturing device 10 Movable pulley (ring-shaped member)
10b Middle burr part 13 3rd work (work)
14 4th work (work)
32 Forging die 32a Movable die 32b Fixed die 32c Annular protrusion 32d Recess (recess)
S space

Claims (4)

リング状部材の製造方法であって、
鍛造型の外周側隅部まで素材を充填し、余剰の前記素材を前記鍛造型の中心側に流動させてワークの中心部に位置する円盤状で中実の中バリ部を前記鍛造型との間に空間を残して張り出させる鍛造工程と、
前記ワークから前記中実の中バリ部を除去する除去工程と、
を有し、
前記鍛造型は、
前記ワークが中心部に有する前記中実の中バリ部の基端部を押圧する位置に設けられた環状突起と、
前記環状突起の内側に設けられ、プレス成形時に前記中実の中バリ部と接触せずに前記中実の中バリ部との間に閉じた前記空間を形成する有底の逃げ部と、
を有する、
ことを特徴とするリング状部材の製造方法。 A method for manufacturing a ring-shaped member, comprising:
The material is filled up to the outer corner of the forging die, and the excess material is allowed to flow toward the center of the forging die, so that a disc-shaped solid center burr located at the center of the workpiece is brought into contact with the forging die. A forging process that leaves a space in between and overhangs,
a removing step of removing the middle burr part of the solid from the work;
has
The forging die is
an annular protrusion provided at a position to press a base end of the solid middle burr portion that the workpiece has at the center;
a bottomed relief part provided inside the annular protrusion and forming the closed space between the solid center burr part and the solid center burr part without contacting the solid center burr part during press molding;
has,
A method for manufacturing a ring-shaped member, characterized in that: 請求項１に記載のリング状部材の製造方法であって、
前記空間は、可動型側に形成される、
ことを特徴とするリング状部材の製造方法。 A method for manufacturing a ring-shaped member according to claim 1, comprising:
The space is formed on the movable mold side.
A method for manufacturing a ring-shaped member, characterized in that: リング状部材の製造に用いられる鍛造型であって、
固定型と可動型との少なくともいずれか一方は、
ワークが中心部に有する円盤状で中実の中バリ部の基端部を押圧する位置に設けられた環状突起と、
前記環状突起の内側に設けられ、プレス成形時に前記中実の中バリ部と接触せずに前記中実の中バリ部との間に閉じた空間を形成する有底の逃げ部と、
を有する、
ことを特徴とする鍛造型。 A forging die used for manufacturing a ring-shaped member,
At least one of the fixed type and the movable type is
an annular protrusion provided at a position to press the base end of a solid, disc-shaped burr portion in the center of the workpiece;
a bottomed relief part provided inside the annular protrusion and forming a closed space between the middle burr part of the solid body and the middle burr part of the solid body without coming into contact with the middle burr part of the solid body during press molding;
has,
A forging die characterized by: 請求項３に記載の鍛造型であって、
前記逃げ部は、前記可動型に設けられる、
ことを特徴とする鍛造型。 The forging die according to claim 3,
The escape part is provided in the movable mold,
A forging die characterized by:
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001079638A (en) 1999-07-13 2001-03-27 Kotani:Kk Hypoid gear for differential and its manufacture

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS606238A (en) * 1983-06-24 1985-01-12 Toyota Motor Corp Press forming method of inner ring of constant-velocity universal joint

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001079638A (en) 1999-07-13 2001-03-27 Kotani:Kk Hypoid gear for differential and its manufacture

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