JP2003117631A - Method of manufacturing forging with gear part, device used therefor, and forging with gear part obtained therewith - Google Patents

Method of manufacturing forging with gear part, device used therefor, and forging with gear part obtained therewith

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Publication number
JP2003117631A
JP2003117631A JP2001314270A JP2001314270A JP2003117631A JP 2003117631 A JP2003117631 A JP 2003117631A JP 2001314270 A JP2001314270 A JP 2001314270A JP 2001314270 A JP2001314270 A JP 2001314270A JP 2003117631 A JP2003117631 A JP 2003117631A
Authority
JP
Japan
Prior art keywords
cylindrical
diameter
gear
mold
die
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001314270A
Other languages
Japanese (ja)
Inventor
Masatoshi Kawasaki
雅敏 川▲崎▼
Original Assignee
Kawasaki Seikoki:Kk
株式会社川▲崎▼精工機
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kawasaki Seikoki:Kk, 株式会社川▲崎▼精工機 filed Critical Kawasaki Seikoki:Kk
Priority to JP2001314270A priority Critical patent/JP2003117631A/en
Publication of JP2003117631A publication Critical patent/JP2003117631A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a forging with a gear part for manufacturing the forging with the gear part such as a gear shaft at a low cost by using a compact die, a device used therefor, and the forging with the gear part. SOLUTION: In a lower die 32, a shallow recessed part of a depth smaller than the length of a columnar part 1 having the same inside diameter as the outside diameter of the columnar part 1 of a metal work is formed downward from the upper surface of the lower die, and a shape-forming part 35a to form a gear part by contracting part of the columnar part 1 is formed downward from a lower end face of the recessed part. In an upper die 31, a work guide 46 having a through hole 50 of the same diameter as the outside diameter of the columnar part 1 of the metal work is fitted in a downwardly pressed and energized condition via a compression coil spring 49, and a punch 47 is held in this work guide 46.

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【発明の属する技術分野】本発明は、ギヤ部付鍛造品の
製法およびそれに用いる装置、並びにそれによって得ら
れるギヤ部付鍛造品に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a forged product with a gear part, an apparatus used therefor, and a forged product with a gear part obtained by the method.
【0002】[0002]
【従来の技術】電気洗濯機の回転駆動部等、回転駆動を
伝達する部位には、セレーション等のギヤ部を形成した
シャフトが用いられている。例えば、全自動電気洗濯機
において、脱水槽を回転させるためのギヤシャフトとし
て、図10(a)に示すような形状のものが用いられて
いる。
2. Description of the Related Art A shaft formed with a gear portion such as serration is used in a portion for transmitting a rotary drive such as a rotary drive portion of an electric washing machine. For example, in a fully automatic electric washing machine, a gear shaft having a shape as shown in FIG. 10 (a) is used as a gear shaft for rotating a dehydration tub.
【0003】このギヤシャフトは、根元側が大径の円柱
部1で、この部分に連なる中間部に、やや縮径されたギ
ヤ部2が形成され、さらにこの部分に連なる先端部が、
2段階で縮径された形状になっている(縮径部3,
4)。
In this gear shaft, a cylindrical portion 1 having a large diameter on the base side is formed, a slightly reduced gear portion 2 is formed in an intermediate portion connected to this portion, and a tip portion connected to this portion is further formed.
The shape is reduced in two steps (diameter reduction part 3,
4).
【0004】上記ギヤシャフトは、通常、ステンレス製
丸棒から、切削により、各部分を所定の外径に削り出
し、ついで、中間部に、ホブ等でギヤ歯を形成して得る
ようにしている。
The above-mentioned gear shaft is usually obtained by cutting each part from a stainless steel round bar to a predetermined outer diameter by cutting, and then forming gear teeth with a hob or the like in the middle part. .
【0005】[0005]
【発明が解決しようとする課題】しかしながら、上記の
製法では、切削代が多いため材料コストおよび加工コス
トが高いという問題があるだけでなく、円柱部1の、ギ
ヤ部2と連なる部分にホブのR(アール)5が残ってし
まうという問題がある。そこで、図10(b)に示すよ
うに、円柱部1とギヤ部2の間に、より径の小さい縮径
部6を設けて、ギヤ歯形成時に、円柱部1側にRがつか
ないようにすることもできるが、このようにすると、縮
径部6において亀裂が生じやすく、ギヤシャフト全体の
強度が低下するという問題がある。また、いずれの方法
によっても、ギヤ歯形成時に金属のファイバーフロー
(繊維状組織)が切断されるので、ギヤ部2の強度が、
金属本来の強度よりも低下するという問題がある。さら
に、ギヤ部2の面粗度が悪いため、噛み合い部が摩耗し
やすく、また騒音を生じやすいという問題がある。
However, in the above-mentioned manufacturing method, not only is there a problem that the material cost and the processing cost are high due to the large cutting allowance, but also the hob is formed in the portion of the column portion 1 which is continuous with the gear portion 2. There is a problem that R (R) 5 remains. Therefore, as shown in FIG. 10B, a reduced diameter portion 6 having a smaller diameter is provided between the columnar portion 1 and the gear portion 2 so that R is not attached to the columnar portion 1 side when gear teeth are formed. However, there is a problem that cracks easily occur in the reduced diameter portion 6 and the strength of the entire gear shaft decreases. In addition, since the metal fiber flow (fibrous tissue) is cut at the time of gear tooth formation by any of the methods, the strength of the gear portion 2 is
There is a problem that the strength is lower than the original strength of metal. Further, since the surface roughness of the gear portion 2 is poor, there is a problem that the meshing portion is easily worn and noise is easily generated.
【0006】そこで、上記ギヤシャフト等を、冷間鍛造
プレスによって製造することが検討されているが、上記
のように、円柱部と縮径されたギヤ部とが連なった形状
を鍛造しようとすると、塑性変形時の歪みが、円柱部側
にひびいて円柱部の周面が膨出しやすいため、この円柱
部を、完全に金型内に挿入した状態で鍛造しなければな
らないことが判明した。そうすると、金型の高さが、非
常に高くなり、また、プレス圧も高く設定しなければな
らず、設置場所の問題およびコストの問題から実用化が
困難である。
Therefore, it is considered to manufacture the gear shaft and the like by a cold forging press. However, if the shape of the columnar portion and the reduced-diameter gear portion is connected as described above, the forging is attempted. It was found that the strain at the time of plastic deformation tends to bulge on the side of the cylindrical portion and the peripheral surface of the cylindrical portion bulges out, so that this cylindrical portion must be forged while it is completely inserted into the mold. Then, the height of the mold becomes very high, and the pressing pressure must be set high, and it is difficult to put it into practical use due to the problem of installation location and the problem of cost.
【0007】本発明は、このような事情に鑑みなされた
もので、ギヤシャフト等のギヤ部付鍛造品を、コンパク
トな金型を用いて低コストで製造することができ、しか
も、得られるギヤ部付鍛造品が、寸法精度および面粗度
に優れたものとなる、優れたギヤ部付鍛造品の製法およ
び装置、並びにそれによって得られるギヤ部付鍛造品の
提供をその目的とする。
The present invention has been made in view of the above circumstances, and a forged product with a gear portion such as a gear shaft can be manufactured at a low cost using a compact mold, and a gear that can be obtained. An object of the present invention is to provide an excellent forged product with a gear part, which is excellent in dimensional accuracy and surface roughness, and a device and a forged product with a gear part obtained thereby.
【0008】[0008]
【課題を解決するための手段】上記の目的を達成するた
め、本発明は、金属製略円柱状素材の円柱部を、下金型
と上金型を組み合わせてなる金型内で塑性変形させるこ
とにより、上記円柱部の一部を縮径すると同時にギヤ部
を形成してギヤ部付鍛造品を得る方法であって、上記下
金型として、その上面から下向きに、上記略円柱状素材
の円柱部外径と同一径の内径を有し上記円柱部の長さ寸
法より深さの浅い凹部が形成され、上記凹部下端面から
下向きに、上記円柱部の一部を縮径してギヤ部を形成す
るための賦形部が形成されたものを用い、上記上金型と
して、上記略円柱状素材の円柱部外径と同一径の貫通穴
を有するワークガイドが、圧縮コイルバネを介して下向
きに押し付け付勢された状態で取り付けられ、このワー
クガイドの貫通穴内に、上記略円柱状素材の円柱部外径
と同一径のパンチを摺動自在に保持させたものを用い、
上記下金型の凹部内に、上記略円柱状素材を、ギヤ部賦
形予定部を下にして装着し、上方から上記上金型を下降
させ、上記上金型のワークガイドの貫通穴内に、上記略
円柱状素材の円柱部のうち下金型の凹部から突出する部
分を嵌入するとともに、上記ワークガイドの下端面を下
金型の上面に当接させ、その状態でパンチを下方に押し
込むことにより、上記円柱部の一部を下金型の賦形部内
に案内して、その部分を、縮径されたギヤ部に鍛造形成
するようにしたギヤ部付鍛造品の製法を第1の要旨とす
る。
In order to achieve the above-mentioned object, the present invention plastically deforms a cylindrical portion of a metal-made substantially cylindrical material in a mold formed by combining a lower mold and an upper mold. This is a method of obtaining a forged product with a gear part by forming a gear part at the same time as reducing the diameter of a part of the columnar part, and as the lower mold, downward from the upper surface of the substantially cylindrical material. A recess having a diameter that is the same as the outer diameter of the cylindrical portion and having a depth that is shallower than the length dimension of the cylindrical portion is formed, and a portion of the cylindrical portion is reduced in diameter downward from the lower end surface of the concave portion to reduce the gear portion. A work guide having a through hole of the same diameter as the outer diameter of the cylindrical portion of the substantially cylindrical material is used as the upper die, and a downward facing shape is formed through a compression coil spring. The work guide is installed in a biased state by pressing it to the through hole of this work guide. In, using those slidably to retain the punch of the cylinder outer diameter and the same diameter of the generally cylindrical material,
In the recess of the lower mold, the substantially cylindrical material is mounted with the gear part shaping planned part facing downward, and the upper mold is lowered from above, into the through hole of the work guide of the upper mold. , While fitting the part of the cylindrical portion of the substantially cylindrical material that protrudes from the recess of the lower die, bring the lower end surface of the work guide into contact with the upper surface of the lower die, and push the punch downward in that state Thus, a part of the columnar part is guided into the shaping part of the lower die, and the part is forged into a reduced-diameter gear part. Use as a summary.
【0009】また、本発明は、上記ギヤ部付鍛造品の製
法に用いられる鍛造装置であって、下金型として、その
上面から下向きに、上記略円柱状素材の円柱部外径と同
一径の内径を有し上記円柱部の長さ寸法より深さの浅い
凹部が形成され、上記凹部下端面から下向きに、上記円
柱部の一部を縮径してギヤ部を形成するための賦形部が
形成されたものが用いられ、上記上金型として、上記略
円柱状素材の円柱部外径と同一径の貫通穴を有するワー
クガイドが、圧縮コイルバネを介して下向きに押し付け
付勢された状態で取り付けられ、このワークガイドの貫
通穴内に、上記略円柱状素材の円柱部外径と同一径のパ
ンチを摺動自在に保持させたものが用いられる鍛造装置
を第2の要旨とする。
Further, the present invention is a forging apparatus used in the method for manufacturing a forged product with a gear portion, wherein the lower die is the same diameter as the outer diameter of the cylindrical portion of the substantially cylindrical material downward from the upper surface thereof. A recessed portion having an inner diameter of less than the length dimension of the cylindrical portion is formed, and a shaping for forming a gear portion is formed by reducing the diameter of a part of the cylindrical portion downward from the lower end surface of the recessed portion. A work guide having a through hole having the same diameter as the outer diameter of the cylindrical portion of the substantially cylindrical material is used as the upper mold and is urged downward by a compression coil spring. A second gist is a forging device which is attached in a state and in which a punch having the same diameter as the outer diameter of the cylindrical portion of the substantially cylindrical material is slidably held in the through hole of the work guide.
【0010】さらに、本発明は、上記鍛造装置のなかで
も、特に、上金型におけるワークガイドの貫通穴の内径
口元寸法が、下金型における凹部の内径口元寸法より、
0.15〜0.25%小さく設定されている鍛造装置を
第3の要旨とする。
Further, according to the present invention, among the above forging devices, in particular, the inner diameter mouth dimension of the through hole of the work guide in the upper die is smaller than the inner diameter mouth dimension of the recess in the lower die.
A forging device set to be smaller by 0.15 to 0.25% is the third gist.
【0011】また、本発明は、前記ギヤ部付鍛造品の製
法によって得られるギヤ部付鍛造品を第4の要旨とし、
そのなかでも、特に、賦形されたギヤ部の外径が、円柱
部外径に対し、絞り率25〜10%で縮径されているギ
ヤ部付鍛造品を第5の要旨とする。
A fourth aspect of the present invention is a forged product with a gear part obtained by the method for producing a forged product with a gear part,
Among these, the fifth gist is a forged product with a gear part, in which the outer diameter of the shaped gear part is reduced at a reduction ratio of 25 to 10% with respect to the outer diameter of the cylindrical part.
【0012】すなわち、本発明は、金属製略円柱状素材
を、上記特殊な上下一対の金型内で圧縮し塑性変形させ
ることにより、円柱部の片側部分に、縮径されたギヤ部
を直接形成してギヤ部付鍛造品を得るようにしたもので
ある。この製法によれば、高強度、高精度で、面粗度に
も優れたギヤ部を、簡単に賦形することができるため、
回転駆動シャフト等として用いるのに好適な製品を、安
価に得ることができる。特に、この製法では、円柱部全
体を金型内に挿入保持させる必要がなく、その一部を下
金型に挿入し、他の部分を上方に突出した状態のまま、
鍛造プレスに供することができるため、鍛造装置全体の
高さが比較的低くなり、プレス圧も低くてすむ。したが
って、省スペースになるとともに、設備コストが安価に
なるという利点を有する。
That is, according to the present invention, a metal gear having a substantially cylindrical shape is compressed and plastically deformed in the special pair of upper and lower molds so that a gear portion having a reduced diameter is directly attached to one side portion of the cylindrical portion. It is formed to obtain a forged product with a gear part. According to this manufacturing method, since the gear portion having high strength, high accuracy, and excellent surface roughness can be easily shaped,
A product suitable for use as a rotary drive shaft or the like can be obtained at low cost. In particular, in this manufacturing method, it is not necessary to insert and hold the entire columnar part in the mold, insert a part of it into the lower mold, and leave the other part projecting upward,
Since it can be used for a forging press, the height of the forging device as a whole is relatively low and the pressing pressure can be low. Therefore, there are advantages that the space is saved and the equipment cost is low.
【0013】[0013]
【発明の実施の形態】つぎに、本発明を、全自動電気洗
濯機の回転駆動部に用いられるギヤシャフトの製造に適
用した一実施の形態を説明する。
BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment in which the present invention is applied to the manufacture of a gear shaft used in a rotary drive unit of a fully automatic electric washing machine will be described.
【0014】この実施の形態において、目的とするギヤ
シャフトの形状を図1に示す。このギヤシャフトは、大
径の円柱部1と、縮径されたギヤ部2(セレーション)
と、縮径部3,4を備えており、基本的には、図10
(a)に示すものと同一形状である。ただし、このもの
は、円柱部1の、ギヤ部2と連なる部分に、ホブ加工品
のようなR(アール)5が生じておらず、明確な境界部
が形成されている。
In this embodiment, the shape of the gear shaft of interest is shown in FIG. This gear shaft has a large diameter cylindrical portion 1 and a reduced diameter gear portion 2 (serration).
And the reduced diameter parts 3 and 4, and basically, FIG.
It has the same shape as that shown in FIG. However, in this case, the R (R) 5 unlike the hobbing product does not occur in the portion of the columnar portion 1 which is continuous with the gear portion 2, and a clear boundary portion is formed.
【0015】なお、上記ギヤシャフトの各部分の寸法
は、図示のとおりである(単位はmm)。
The dimensions of each part of the gear shaft are as shown in the drawing (unit: mm).
【0016】つぎに、上記ギヤシャフトの製法について
説明する。まず、図2(a)に示すように、直径36m
mのS35Cの棒材を90mmの長さに切断して、円柱
状素材10を用意する。そして、この円柱状素材10の
表面に潤滑性を与えるために、モリブデン系処理剤によ
り表面処理を行う(いわゆる「黒ボンデ処理」)。
Next, a method of manufacturing the above gear shaft will be described. First, as shown in FIG. 2 (a), the diameter is 36 m.
A columnar material 10 is prepared by cutting an S35C rod of m into a length of 90 mm. Then, in order to impart lubricity to the surface of the cylindrical material 10, a surface treatment is performed with a molybdenum-based treatment agent (so-called “black bonder treatment”).
【0017】つぎに、これを、第1の金型に装填して、
例えば400トン(39.23×103 MPa)のプレ
ス圧で冷間鍛造により塑性変形させて、図2(b)に示
すように、円柱部1の片側に、縮径部3,4を形成す
る。そして、一端側の縮径部3,4が形成された中間体
10′を第2の金型に装填して、例えば220トン(2
1.58×103 MPa)のプレス圧で冷間鍛造により
塑性変形させてギヤ部2を形成することにより、図1に
示すようなギヤシャフトを得ることができる。
Next, this is loaded into the first mold,
For example, by plastically deforming by cold forging with a press pressure of 400 tons (39.23 × 10 3 MPa), the reduced diameter portions 3 and 4 are formed on one side of the columnar portion 1 as shown in FIG. To do. Then, the intermediate body 10 'in which the diameter-reduced portions 3 and 4 on one end side are formed is loaded into the second mold, and, for example, 220 tons (2
A gear shaft as shown in FIG. 1 can be obtained by plastically deforming by cold forging with a press pressure of 1.58 × 10 3 MPa) to form the gear portion 2.
【0018】上記円柱状素材10から中間体10′を得
るための第1の金型を、図3に示す。この金型は、上金
型11と下金型12とからなり、上記下金型12は、型
部13と、芯出し用のガイドリング14と、これらを受
ける円筒状の載置台15とを備えている。
FIG. 3 shows a first mold for obtaining the intermediate 10 'from the columnar material 10. This mold comprises an upper mold 11 and a lower mold 12. The lower mold 12 comprises a mold part 13, a guide ring 14 for centering, and a cylindrical mounting table 15 for receiving these. I have it.
【0019】上記型部13の中央には、賦形用の貫通穴
16が形成されており、上記円柱状素材10を起立姿勢
で完全に入り込ませる深さ分だけ、円柱状素材10と同
一径に形成されている。また、上記貫通穴16の下部1
6aは、図2(b)に示す縮径部3,4と同一径になる
よう、2段に縮径されている。
A through hole 16 for shaping is formed in the center of the mold portion 13 and has the same diameter as that of the cylindrical material 10 by a depth such that the cylindrical material 10 can be completely inserted in the standing posture. Is formed in. In addition, the lower part 1 of the through hole 16
The diameter 6a is reduced in two stages so that it has the same diameter as the diameter reducing portions 3 and 4 shown in FIG. 2 (b).
【0020】なお、上記「同一径」とは、文字通りの
「同一径」に限らず、互いに嵌め合うことのできる程度
に公差が設けられた寸法の径をも含むものであり、以下
の「同一径」も同様の趣旨で用いている。
The "same diameter" is not limited to the literal "same diameter", but also includes diameters having dimensions with a tolerance that allows them to be fitted to each other. "Diameter" is also used for the same purpose.
【0021】また、上記貫通穴16の下端開口には、そ
の下の載置台15の中央部に下から挿通された昇降ピン
17の上端部が突出して嵌入されている。この昇降ピン
17の上面は、鍛造プレス時に、塑性変形される円柱状
素材10の下端面を規制するようになっている(図4参
照)。そして、鍛造プレス終了後には、図5に示すよう
に、上記昇降ピン17が載置台15内を上昇して、塑性
変形により得られた中間品10′を、下金型12の貫通
穴16内から押し出すようになっている。
Further, an upper end portion of an elevating pin 17 which is inserted from below into a central portion of the mounting table 15 therebelow is projectingly fitted into the lower end opening of the through hole 16. The upper surface of the elevating pin 17 regulates the lower end surface of the cylindrical material 10 that is plastically deformed during the forging press (see FIG. 4). After the forging press is finished, as shown in FIG. 5, the elevating pins 17 ascend in the mounting table 15 and the intermediate product 10 ′ obtained by plastic deformation is placed in the through hole 16 of the lower die 12. It is designed to be pushed out from.
【0022】なお、上記円柱状素材10(図3に戻る)
の下部を縮径して2段の縮径部3,4(図2〔b〕参
照)を賦形するための、貫通穴16の下部16aの段差
部には、ともに塑性変形による縮径を円滑に行うため
に、θ=30°のテーパが付与されている。上記テーパ
角度θは、縮径部3,4の絞り率によって、適宜設定さ
れるが、通常、15〜50°、特に25〜35°、なか
でも30°前後に設定することが好適である。
The columnar material 10 (return to FIG. 3)
The lower step 16a of the through-hole 16 has a stepped portion for reducing the diameter of the lower portion of the through hole 16 to form the two reduced diameter portions 3, 4 (see FIG. 2B). For smooth operation, a taper of θ = 30 ° is provided. The taper angle θ is appropriately set depending on the drawing ratio of the diameter-reduced portions 3 and 4, but is usually set to 15 to 50 °, particularly 25 to 35 °, and preferably about 30 °.
【0023】一方、上金型11は、昇降手段(図示せ
ず)により昇降動作が付与される昇降ブロック20と、
この昇降ブロック20の中央貫通穴20aに嵌入固定さ
れ、先端部が下向きに突出するパンチ21とを備えてい
る。上記パンチ21の突出部外径は、円柱状素材10の
外径と同一径に設定される。
On the other hand, the upper mold 11 includes an elevating block 20 to which an elevating operation is applied by elevating means (not shown),
The lifting block 20 is provided with a punch 21 which is fitted and fixed in the central through hole 20a and whose tip portion projects downward. The outer diameter of the protruding portion of the punch 21 is set to be the same as the outer diameter of the columnar material 10.
【0024】したがって、上記下金型12の貫通穴16
内に円柱状素材10を嵌入したのち、図4に示すよう
に、上方から上金型11を下降させることにより、上記
上金型11のパンチ21で円柱状素材10の上端面を押
圧し、円柱状素材10を下方に押し込むことができる。
これにより、円柱状素材10の下部が、2段に縮径され
た貫通穴16の下部16aに進入して、塑性変形により
縮径部3,4が賦形される。なお、すでに述べたよう
に、塑性変形した円柱状素材10の下端面は、下から延
びる昇降ピン17の上端面で規制されており、それ以上
下がることはない。
Therefore, the through hole 16 of the lower die 12
After inserting the columnar material 10 into the inside, as shown in FIG. 4, by lowering the upper die 11 from above, the upper end surface of the columnar material 10 is pressed by the punch 21 of the upper die 11, The columnar material 10 can be pushed downward.
As a result, the lower portion of the columnar material 10 enters the lower portion 16a of the through hole 16 having a diameter reduced in two steps, and the reduced diameter portions 3 and 4 are formed by plastic deformation. As described above, the lower end surface of the plastically deformed columnar material 10 is regulated by the upper end surface of the elevating pin 17 extending from below, and cannot be further lowered.
【0025】そして、図5に示すように、上金型11を
上昇させ、下金型12の昇降ピン17を上昇させること
により、下金型12の貫通穴16内から、下部が2段に
縮径された中間品10′(塑性変形した円柱状素材1
0)を取り出して、脱型することができる。
Then, as shown in FIG. 5, the upper mold 11 is raised and the elevating pins 17 of the lower mold 12 are raised so that the lower part of the through hole 16 of the lower mold 12 has two stages. Reduced intermediate product 10 '(plastically deformed cylindrical material 1
0) can be taken out and demolded.
【0026】つぎに、上記中間品10′に、縮径された
ギヤ部2(図1参照)を形成するための第2の金型を、
図6に示す。この金型は、上金型31と下金型32とか
らなり、上記下金型32は、中間品10′の円柱部1を
部分的に支受する貫通穴33が形成された型部34と、
上記貫通穴33と同軸的な貫通穴35が形成されたダイ
ス部36とを備えている。
Next, a second mold for forming the reduced-diameter gear portion 2 (see FIG. 1) is formed on the intermediate product 10 '.
As shown in FIG. The mold comprises an upper mold 31 and a lower mold 32. The lower mold 32 has a through hole 33 for partially supporting the columnar part 1 of the intermediate product 10 '. When,
The die part 36 is provided with the through hole 33 and the through hole 35 coaxial with the through hole 33.
【0027】上記ダイス部36の貫通穴35は、その上
縁部が、中間品10′の、円柱部1と縮径部2の境界部
(テーパが形成されている)と係合しうる凹形状になっ
ている。したがって、上記型部34の貫通穴33と、上
記ダイス部36の貫通穴35の凹形状部とによって、中
間品10′の円柱部1を、起立姿勢で部分的に係合保持
する凹部が形成されることとなる。そして、上記ダイス
部36の、貫通穴35の下の部分には、円柱部1を部分
的に縮径してギヤ部を賦形するための賦形部35aが形
成されている。
The through hole 35 of the die portion 36 has a concave upper end portion which can engage with the boundary portion (tapered) of the cylindrical portion 1 and the reduced diameter portion 2 of the intermediate product 10 '. It has a shape. Therefore, the through hole 33 of the die portion 34 and the concave portion of the through hole 35 of the die portion 36 form a concave portion that partially engages and holds the cylindrical portion 1 of the intermediate product 10 'in the upright posture. Will be done. Then, a shaping portion 35a for shaping the gear portion by partially reducing the diameter of the columnar portion 1 is formed in a portion of the die portion 36 below the through hole 35.
【0028】また、上記ダイス部36は、ガイドリング
37によって周方向から保持されているとともに、台部
38によって下方向から支受されている。そして、これ
ら全体が、円筒状の載置台39上に組み付けられてい
る。なお、上記台部38および載置台39にも、同軸的
に、貫通穴38a,39aが形成されており、この部分
に、下から延びる昇降ピン40が挿通されている。そし
て、上記台部38の貫通穴38aの内径と、昇降ピン4
0の外径は、中間品10′の円柱部1の外径と同一径に
設定されており、初期状態では、上記昇降ピン40が、
台部38の貫通穴38aの下部に入り込んでいる。
The die part 36 is held by the guide ring 37 from the circumferential direction and is supported by the base part 38 from below. Then, all of them are assembled on a cylindrical mounting table 39. In addition, through holes 38a, 39a are coaxially formed in the base portion 38 and the mounting base 39, and an elevating pin 40 extending from below is inserted in this portion. Then, the inner diameter of the through hole 38a of the base portion 38 and the lifting pin 4
The outer diameter of 0 is set to be the same as the outer diameter of the cylindrical portion 1 of the intermediate product 10 ′, and in the initial state, the lifting pin 40 is
It penetrates into the lower part of the through hole 38 a of the base 38.
【0029】一方、上金型31は、昇降手段(図示せ
ず)によって昇降自在に構成された円筒状の昇降ブロッ
ク45と、上記昇降ブロック45の中空部に摺動自在に
取り付けられるワークガイド46と、上記ワークガイド
46に保持されるパンチ47とを備えている。
On the other hand, the upper die 31 is a cylindrical elevating block 45 which is configured to be vertically movable by an elevating means (not shown), and a work guide 46 which is slidably attached to the hollow portion of the elevating block 45. And a punch 47 held by the work guide 46.
【0030】上記ワークガイド46の外周面上部46a
は周方向に突出しており、昇降ブロック45の内周面に
設けられた段差部45aに係合して抜け止めされてい
る。そして、上記突出した外周面上部46aおよびそれ
以外の外周面46bが、昇降ブロック45の内周面に沿
って上下に摺動するようになっている。また、ワークガ
イド46の上面には、周方向に均等に4個の貫通穴48
が形成されており、各貫通穴48内に、圧縮コイルバネ
49の下部が嵌入されている。上記圧縮コイルバネ49
の上面は、昇降ブロック45の取り付け面Xに、やや押
し付けられた状態で当接しており、ワークガイド46を
下向きに押し付け付勢している。
Upper part 46a of the outer peripheral surface of the work guide 46
Protrudes in the circumferential direction, and engages with a step portion 45a provided on the inner peripheral surface of the elevating block 45 to prevent it from coming off. The projecting outer peripheral surface upper portion 46a and the other outer peripheral surface 46b slide up and down along the inner peripheral surface of the elevating block 45. Further, on the upper surface of the work guide 46, four through holes 48 are evenly arranged in the circumferential direction.
Is formed, and the lower part of the compression coil spring 49 is fitted in each through hole 48. The compression coil spring 49
The upper surface of the above contact the mounting surface X of the elevating block 45 in a slightly pressed state, and presses and biases the work guide 46 downward.
【0031】上記圧縮コイルバネ49によってワークガ
イド46を押し付け付勢するときの押圧力は、塑性変形
させるものの材質や形状、プレス圧等によって左右され
るが、この例では、4本の圧縮コイルバネ49として、
TL10×65(青色)という規格品を用いている。
The pressing force for pressing and urging the work guide 46 by the compression coil spring 49 depends on the material and shape of the material to be plastically deformed, the pressing pressure, etc. In this example, four compression coil springs 49 are used. ,
A standard product called TL10 × 65 (blue) is used.
【0032】さらに、上記ワークガイド46の中央に
は、段差部46cを有する貫通穴50が形成されてお
り、この貫通穴50内に、パンチ47が、上下に摺動自
在に嵌入保持されている。すなわち、上記パンチ47の
外周面上部47aも、ワークガイド46と同様、周方向
に突出しており、この部分が上記段差部46cに係合し
て抜け止めがなされている。そして、パンチ47の上記
突出した外周面上部47aおよびそれ以外の外周面47
bが、ワークガイド46の内周面に沿って上下に摺動す
るようになっている。
Further, a through hole 50 having a step portion 46c is formed in the center of the work guide 46, and a punch 47 is vertically slidably fitted and held in the through hole 50. . That is, similarly to the work guide 46, the outer peripheral surface upper portion 47a of the punch 47 also projects in the circumferential direction, and this portion is engaged with the step portion 46c to prevent the punch 47 from coming off. Then, the protruding outer peripheral surface upper portion 47a of the punch 47 and the other outer peripheral surface 47a
b slides up and down along the inner peripheral surface of the work guide 46.
【0033】なお、パンチ47の、突出した上部47a
よりも下の部分の外径は、中間品10′の円柱部1の外
径と同一径に設定されている。また、これを摺動保持す
るワークガイド46の貫通穴50の、段差部46cより
下の部分の内径口元寸法Rも、中間品10′の円柱部1
の外径と同一径に設定されている。ただし、上記ワーク
ガイド46の貫通穴50の内径口元寸法Rは、前記型部
34の貫通穴33の内径口元寸法Sよりも、0.15〜
0.25%小さく設定されていることが好適で、例え
ば、この例では、上記Sを35.95mm、Rを35.
90mmに設定している。すなわち、Rを、Sに対し上
記の範囲で小さくしておかないと、加工時に、円柱部1
の外径が膨らんで下金型32の貫通穴33の内径寸法よ
り大きくなり、これを下に押し込むほど上金型31のワ
ークガイド46に負担がかかってパンチ47およびワー
クガイド46が損傷するおそれがあるからである。
The protruding upper portion 47a of the punch 47
The outer diameter of the lower portion is set to be the same as the outer diameter of the cylindrical portion 1 of the intermediate product 10 '. In addition, the inner diameter mouthpiece dimension R of the through hole 50 of the work guide 46 that slidably holds it below the stepped portion 46c is also the cylindrical portion 1 of the intermediate product 10 '.
It is set to the same diameter as the outer diameter of. However, the inner diameter opening dimension R of the through hole 50 of the work guide 46 is 0.15 to 0.15 smaller than the inner diameter opening dimension S of the through hole 33 of the mold portion 34.
It is preferable to set 0.25% smaller. For example, in this example, S is 35.95 mm and R is 35.95 mm.
It is set to 90 mm. That is, unless R is set to be smaller than S within the above range, the cylindrical portion 1
Of the through hole 33 of the lower mold 32 becomes larger than the inner diameter of the through hole 33 of the lower mold 32, and the work guide 46 of the upper mold 31 is more burdened as it is pushed downward, and the punch 47 and the work guide 46 may be damaged. Because there is.
【0034】上記上金型31および下金型32を用い、
以下の手順により、中間品10′に最終形状を賦形する
ことができる。まず、上記下金型32において、型部3
4の貫通穴33およびダイス部36の貫通穴35の上縁
部によって形成された凹部内に、中間品10′の円柱部
1を、縮径部3,4を下にした起立姿勢で、部分的に嵌
入する。
Using the upper die 31 and the lower die 32,
The final shape can be formed on the intermediate product 10 'by the following procedure. First, in the lower die 32, the die portion 3
4 in the recess formed by the upper edge of the through hole 33 of the die part 36 and the through hole 35 of the die part 36, the cylindrical part 1 of the intermediate product 10 'is placed in a standing posture with the reduced diameter parts 3, 4 down Fit in.
【0035】つぎに、図7に示すように、上方から上金
型31を下降させることにより、上記上金型31のパン
チ47で中間品10′の上端面を押圧し、中間品10′
を下方に押し込むことができる。これにより、中間品1
0′の下部が、ダイス部36の、縮径されたギヤ部の賦
形部35aに進入して塑性変形し、縮径されたギヤ部2
が賦形される。
Next, as shown in FIG. 7, by lowering the upper mold 31 from above, the punch 47 of the upper mold 31 presses the upper end surface of the intermediate product 10 ', and the intermediate product 10'.
Can be pushed downwards. As a result, the intermediate product 1
The lower part of 0'enters the shaped portion 35a of the reduced diameter gear portion of the die portion 36 to be plastically deformed, and the reduced diameter gear portion 2
Is shaped.
【0036】なお、このとき、下金型32の上面から上
方に突出する中間品10′の円柱部残部1aは、図示の
ように、圧縮コイルバネ49によって下向きに押し付け
付勢されたワークガイド46の貫通穴50内に嵌入した
状態となり、塑性変形の進行とともに円柱部残部1aの
長さが変わっても、常に円柱部残部1aの外周面を規制
することができるため、この部分が周方向に膨出する等
の問題が生じることがない。
At this time, the cylindrical portion remaining portion 1a of the intermediate product 10 'projecting upward from the upper surface of the lower die 32 of the work guide 46 biased downward by the compression coil spring 49 as shown in the figure. Even if the length of the cylindrical portion remaining portion 1a changes as the plastic deformation progresses, the outer peripheral surface of the cylindrical portion remaining portion 1a can be regulated at all times, and this portion is expanded in the circumferential direction. There is no problem such as taking out.
【0037】また、塑性変形に伴い下方に移動する中間
品10′の下端面は、下から延びる昇降ピン40の上端
面に当接する前に、塑性変形が完了するよう設定されて
おり、縮径部3,4の形状に変化が与えることはない。
The lower end surface of the intermediate product 10 'which moves downward due to the plastic deformation is set so that the plastic deformation is completed before it abuts on the upper end surface of the elevating pin 40 extending from the bottom, and the diameter is reduced. The shape of the parts 3 and 4 does not change.
【0038】つぎに、図8に示すように、上金型31を
上昇させ、下金型32の昇降ピン40を上昇させること
により、下金型32の貫通穴33,35内から、円柱部
1の下部にギヤ部2が賦形された完成品10″を取り出
して脱型することができる。
Next, as shown in FIG. 8, the upper die 31 is raised and the elevating pins 40 of the lower die 32 are raised, so that the cylindrical portion is inserted from the through holes 33, 35 of the lower die 32. It is possible to take out a finished product 10 ″ having the gear portion 2 formed on the lower part of 1 and remove it from the mold.
【0039】上記製法によれば、円柱部1に連なる部分
に、高強度、高精度で、面粗度にも優れたギヤ部を、上
記円柱部1より縮径した状態で、簡単に賦形することが
できるため、回転駆動シャフト等として用いるのに好適
な製品を、安価に得ることができる。特に、この製法で
は、円柱部全体を金型内に嵌入保持させる必要がなく、
その一部を下金型に挿入し、他の部分を上方に突出した
状態のまま、鍛造プレスに供することができるため、鍛
造装置全体の高さが比較的低くなり、プレス圧も低くて
すむ。したがって、省スペースになるとともに、設備コ
ストが安価になるという利点を有する。
According to the above-mentioned manufacturing method, a gear portion having high strength, high accuracy, and excellent surface roughness is easily formed in a portion connected to the cylindrical portion 1 in a state in which the diameter of the gear portion is smaller than that of the cylindrical portion 1. Therefore, a product suitable for use as a rotary drive shaft or the like can be obtained at low cost. In particular, in this manufacturing method, it is not necessary to fit and hold the entire columnar portion in the mold,
One part of it can be inserted into the lower mold and the other part can be used for forging press with the other part protruding upward. Therefore, the height of the forging machine is relatively low and the press pressure is low. . Therefore, there are advantages that the space is saved and the equipment cost is low.
【0040】ちなみに、上記の例で用いる第2の金型
は、220トン程度のプレスを与えるものでよく、全体
の高さも250mm程度に設定されるが、円柱部全体を
片方の金型内に嵌入保持して鍛造プレスを行うとすれ
ば、400トンプレスを与えるものでなければならず、
その高さは400〜450mm必要となる。
By the way, the second mold used in the above example may be one which gives a press of about 220 tons, and the overall height is set to about 250 mm, but the entire columnar part is placed in one mold. If the forging press is performed while holding the insert, it must give a 400 ton press,
The height is required to be 400 to 450 mm.
【0041】また、上記の例で得られたギヤシャフト
(完成品10″)において、ギヤ部2の面粗度を、下記
の方法に従って測定したところ、後記の表1に示すデー
タが得られた。
Further, in the gear shaft (finished product 10 ″) obtained in the above example, the surface roughness of the gear portion 2 was measured by the following method, and the data shown in Table 1 below was obtained. .
【0042】〔面粗度の測定方法〕図9に示すように、
完成品10″のギヤ部2の歯面の、軸方向に略等間隔で
並ぶ〜の4個所を測定ポイントとして、各ポイント
の面粗度(Rmax)を、粗さ測定計(東京精密社製)
を用いて測定した。測定条件は、つぎのとおりである。 評価長さ :0.800mm 測定速度 :0.3mm/秒 カットオフ値:0.8mm フィルタ種別:2RC 測定レンジ :±40.0μm
[Method of Measuring Surface Roughness] As shown in FIG.
The surface roughness (Rmax) of each of the four points of the tooth surface of the gear part 2 of the finished product 10 ″ arranged at approximately equal intervals in the axial direction is set as a measurement point. )
Was measured using. The measurement conditions are as follows. Evaluation length: 0.800 mm Measurement speed: 0.3 mm / sec Cut-off value: 0.8 mm Filter type: 2RC Measurement range: ± 40.0 μm
【0043】[0043]
【表1】 [Table 1]
【0044】上記の結果から、前記製法によって得られ
たギヤシャフトのギヤ部2は、どの部分も、面粗度(R
max)が1μm以下であり、平滑性に非常に優れてい
ることがわかる。なお、ホブ盤によって歯切り加工をし
て得られるギヤ部の面粗度を、同様の測定方法で求める
と、3.0〜3.5μm 程度になり、平滑性において大
きく劣ることがわかる。
From the above results, in the gear portion 2 of the gear shaft obtained by the above manufacturing method, the surface roughness (R
max) is 1 μm or less, and it is understood that the smoothness is very excellent. When the surface roughness of the gear portion obtained by gear cutting with a hobbing machine is obtained by the same measurement method, it is about 3.0 to 3.5 μm, which is very poor in smoothness.
【0045】なお、上記実施例では、円柱状素材とし
て、S35Cを用いたが、材質は、特にこれに限定する
ものではなく、剛性,靱性等の観点から、SUS41
0,SUS403等のステンレス鋼や、高強度の各種金
属,合金等を用いることができる。
Although S35C is used as the columnar material in the above embodiment, the material is not particularly limited to this, and SUS41 is used from the viewpoint of rigidity, toughness and the like.
0, SUS403, and other stainless steel, and various high-strength metals and alloys can be used.
【0046】同様に、金型の各部材の材質についても、
塑性変形させるものの材質や、プレス圧等に応じて、適
宜のものを選択することができる。
Similarly, regarding the material of each member of the mold,
An appropriate material can be selected according to the material of the material to be plastically deformed, the pressing pressure and the like.
【0047】また、上記の例は、ギヤシャフトを得るた
めに、まず、円柱状素材10を、第1の金型11,12
により冷間鍛造プレスを行って、先端部に2段階の縮径
部3,4が形成された中間品10′を得たのち、第2の
金型31,32により冷間鍛造プレスを行って、完成品
10″を得るようにしているが、上記中間品10′は、
冷間鍛造プレスによらず、切削加工によって得るように
しても差し支えない。
In the above example, in order to obtain the gear shaft, first, the columnar material 10 is placed in the first molds 11 and 12.
After performing a cold forging press by using, to obtain an intermediate product 10 'in which the two-stage reduced diameter portions 3 and 4 are formed at the tip end, a cold forging press is performed by using the second molds 31 and 32. , The finished product 10 ″ is obtained, but the intermediate product 10 ′ is
It does not matter if it is obtained by cutting instead of the cold forging press.
【0048】また、上記の例は、一端側に縮径部3,4
が形成され、中間部にギヤ部2が形成された特殊な形状
のギヤシャフトに、本発明を適用したものであるが、本
発明は、このような形状に限らず、円柱部1の一端部
に、縮径されたギヤ部2が形成された形状であれば、ど
のような形状のものであっても差し支えない。
In the above example, the reduced diameter portions 3, 4 are provided on one end side.
The present invention is applied to a gear shaft having a special shape in which the gear portion 2 is formed and the gear portion 2 is formed in the middle portion. However, the present invention is not limited to such a shape, and one end portion of the cylindrical portion 1 is not limited to this shape. In addition, as long as the reduced-diameter gear portion 2 is formed, any shape may be used.
【0049】そして、上記ギヤ部2に形成される凹凸
は、いわゆるギヤ歯に限らず、セレーション、単なる溝
や突状等、軸方向に延びる凹凸であれば、どのようなも
のであっても差し支えない。本発明では、これらの凹凸
形状を総称して「ギヤ部」と称している。
The irregularities formed on the gear portion 2 are not limited to so-called gear teeth, but may be any irregularities extending in the axial direction such as serrations, simple grooves or protrusions. Absent. In the present invention, these concavo-convex shapes are collectively referred to as "gear portion".
【0050】また、円柱部1に賦形するギヤ部2の絞り
率は、特に限定するものではないが、急激に絞ることは
困難なため、通常の、ワークが下金型の中に完全に挿入
された状態で鍛造する場合には、その絞り率を65〜4
5%に設定することが好適であるが、本発明のように、
ワークが下金型32から部分的に突出した状態で鍛造す
る場合には、その絞り率は25〜10%に設定すること
が好適である。なお、上記「絞り率」とは、下記の式で
求めることができる。
The drawing ratio of the gear portion 2 formed on the cylindrical portion 1 is not particularly limited, but it is difficult to sharply draw it. When forging in the inserted state, the drawing ratio is 65-4
Although it is preferable to set it to 5%, like the present invention,
When the work is forged while partially protruding from the lower die 32, it is preferable to set the drawing ratio to 25 to 10%. The "drawing ratio" can be calculated by the following formula.
【0051】[0051]
【数1】 [Equation 1]
【0052】さらに、円柱部1にギヤ部2を賦形する場
合、本発明では、円柱部1の一部を下金型32内に嵌入
し、残りの部分を上方に突出させた状態で上金型31を
下ろしてワークガイド46でその周面をガイドしながら
鍛造プレスを行うようにしているが、円柱部1のうち、
上方に突出させる割合(塑性変形前の状態)は、円柱部
1の全長に対し、30〜60%に設定することが好適で
ある。すなわち、この範囲で、最も効果的な塑性変形を
行うことができ、プレス圧の低減と金型高さの低減を実
現することができるからである。
Further, in the case of forming the gear portion 2 on the columnar portion 1, according to the present invention, a part of the columnar portion 1 is fitted into the lower mold 32, and the remaining portion is projected upward. Although the die 31 is lowered and the work guide 46 guides the peripheral surface thereof, the forging press is performed.
It is preferable that the ratio of upward projection (state before plastic deformation) is set to 30 to 60% with respect to the entire length of the columnar portion 1. That is, in this range, the most effective plastic deformation can be performed, and the reduction of the pressing pressure and the reduction of the die height can be realized.
【0053】[0053]
【発明の効果】以上のように、本発明は、金属製略円柱
状素材を、上記特殊な上下一対の金型内で圧縮し塑性変
形させることにより、円柱部の片側部分に、縮径された
ギヤ部を直接形成してギヤ部付鍛造品を得るようにした
ものである。この製法によれば、高強度、高精度で、面
粗度にも優れたギヤ部を、簡単に賦形することができる
ため、回転駆動シャフト等として用いるのに好適な製品
を、安価に得ることができる。特に、この製法では、円
柱部全体を金型内に挿入保持させる必要がなく、その一
部を下金型に挿入し、他の部分を上方に突出した状態の
まま、鍛造プレスに供することができるため、鍛造装置
全体の高さが比較的低くなり、プレス圧も低くてすむ。
したがって、省スペースになるとともに、設備コストが
安価になるという利点を有する。
As described above, according to the present invention, a metal-made substantially columnar material is compressed and plastically deformed in the special pair of upper and lower molds so that the diameter is reduced to one side portion of the cylindrical portion. The gear part is directly formed to obtain a forged product with a gear part. According to this manufacturing method, a gear portion having high strength, high accuracy, and excellent surface roughness can be easily shaped, and thus a product suitable for use as a rotary drive shaft or the like can be obtained at low cost. be able to. In particular, in this manufacturing method, it is not necessary to insert and hold the entire columnar part in the mold, and a part of it can be inserted into the lower mold, and the other part can be subjected to the forging press while protruding upward. Therefore, the height of the forging device as a whole is relatively low, and the pressing pressure is low.
Therefore, there are advantages that the space is saved and the equipment cost is low.
【図面の簡単な説明】[Brief description of drawings]
【図1】本発明の一実施例によって得られるギヤシャフ
トの形状を示す説明図である。
FIG. 1 is an explanatory view showing a shape of a gear shaft obtained according to an embodiment of the present invention.
【図2】(a),(b)はいずれも上記ギヤシャフトを
製造するための工程説明図である。
2A and 2B are process explanatory views for manufacturing the above gear shaft.
【図3】上記実施例に用いる第1の金型の動作説明図で
ある。
FIG. 3 is an operation explanatory view of the first mold used in the above embodiment.
【図4】上記実施例に用いる第1の金型の動作説明図で
ある。
FIG. 4 is an operation explanatory view of the first mold used in the above embodiment.
【図5】上記実施例に用いる第1の金型の動作説明図で
ある。
FIG. 5 is an operation explanatory view of the first mold used in the above embodiment.
【図6】上記実施例に用いる第2の金型の動作説明図で
ある。
FIG. 6 is an operation explanatory view of a second mold used in the above-mentioned embodiment.
【図7】上記実施例に用いる第2の金型の動作説明図で
ある。
FIG. 7 is an operation explanatory view of the second mold used in the above-described embodiment.
【図8】上記実施例に用いる第2の金型の動作説明図で
ある。
FIG. 8 is an operation explanatory view of the second mold used in the above-described embodiment.
【図9】ギヤ部の面粗度を測定する方法の説明図であ
る。
FIG. 9 is an explanatory diagram of a method for measuring the surface roughness of the gear portion.
【図10】(a)は、従来のギヤシャフトの一例を示す
説明図、(b)は従来のギヤシャフトの他の例を示す説
明図である。
10A is an explanatory view showing an example of a conventional gear shaft, and FIG. 10B is an explanatory view showing another example of a conventional gear shaft.
【符号の説明】 1 円柱部 31 上金型 32 下金型 33,35,50 貫通穴 34 型部 35a 賦形部 46 ワークガイド 47 パンチ 49 圧縮コイルバネ[Explanation of symbols] 1 column 31 Upper mold 32 Lower mold 33,35,50 through holes 34 Mold 35a shaping part 46 Work guide 47 punch 49 compression coil spring

Claims (5)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 金属製略円柱状素材の円柱部を、下金型
    と上金型を組み合わせてなる金型内で塑性変形させるこ
    とにより、上記円柱部の一部を縮径すると同時にギヤ部
    を形成してギヤ部付鍛造品を得る方法であって、上記下
    金型として、その上面から下向きに、上記略円柱状素材
    の円柱部外径と同一径の内径を有し上記円柱部の長さ寸
    法より深さの浅い凹部が形成され、上記凹部下端面から
    下向きに、上記円柱部の一部を縮径してギヤ部を形成す
    るための賦形部が形成されたものを用い、上記上金型と
    して、上記略円柱状素材の円柱部外径と同一径の貫通穴
    を有するワークガイドが、圧縮コイルバネを介して下向
    きに押し付け付勢された状態で取り付けられ、このワー
    クガイドの貫通穴内に、上記略円柱状素材の円柱部外径
    と同一径のパンチを摺動自在に保持させたものを用い、
    上記下金型の凹部内に、上記略円柱状素材を、ギヤ部賦
    形予定部を下にして装着し、上方から上記上金型を下降
    させ、上記上金型のワークガイドの貫通穴内に、上記略
    円柱状素材の円柱部のうち下金型の凹部から突出する部
    分を嵌入するとともに、上記ワークガイドの下端面を下
    金型の上面に当接させ、その状態でパンチを下方に押し
    込むことにより、上記円柱部の一部を下金型の賦形部内
    に案内して、その部分を、縮径されたギヤ部に鍛造形成
    するようにしたことを特徴とするギヤ部付鍛造品の製
    法。
    1. A gear part is formed by plastically deforming a cylindrical part made of a substantially cylindrical columnar material made of metal in a mold formed by combining a lower mold and an upper mold. In the method of obtaining a forged product with a gear part by forming, as the lower die, the downward direction from the upper surface of the cylindrical part of the substantially cylindrical material having an inner diameter equal to the outer diameter of the cylindrical part A recess having a depth shallower than the length dimension is formed, downward from the recess lower end surface, using a shape-forming portion for forming a gear portion by reducing the diameter of a part of the cylindrical portion, As the upper mold, a work guide having a through hole having the same diameter as the outer diameter of the cylindrical portion of the substantially cylindrical material is attached in a state of being pressed downward via a compression coil spring and urged. Insert a punch with the same diameter as the outer diameter of the cylindrical part of the above-mentioned cylindrical material into the hole. Use one that is held slidably,
    In the recess of the lower mold, the substantially cylindrical material is mounted with the gear part shaping planned part facing downward, and the upper mold is lowered from above, into the through hole of the work guide of the upper mold. , While fitting the part of the cylindrical portion of the substantially cylindrical material that protrudes from the recess of the lower die, bring the lower end surface of the work guide into contact with the upper surface of the lower die, and push the punch downward in that state Thereby, a part of the columnar part is guided into the shaping part of the lower die, and that part is forged and formed into a gear part having a reduced diameter. Manufacturing method.
  2. 【請求項2】 請求項1記載のギヤ部付鍛造品の製法に
    用いられる鍛造装置であって、下金型として、その上面
    から下向きに、上記略円柱状素材の円柱部外径と同一径
    の内径を有し上記円柱部の長さ寸法より深さの浅い凹部
    が形成され、上記凹部下端面から下向きに、上記円柱部
    の一部を縮径してギヤ部を形成するための賦形部が形成
    されたものが用いられ、上記上金型として、上記略円柱
    状素材の円柱部外径と同一径の貫通穴を有するワークガ
    イドが、圧縮コイルバネを介して下向きに押し付け付勢
    された状態で取り付けられ、このワークガイドの貫通穴
    内に、上記略円柱状素材の円柱部外径と同一径のパンチ
    を摺動自在に保持させたものが用いられることを特徴と
    する鍛造装置。
    2. A forging device used in the method for manufacturing a forged product with a gear according to claim 1, wherein the lower die is the same diameter as the outer diameter of the cylindrical portion of the substantially cylindrical material downward from the upper surface thereof. A recessed portion having an inner diameter of less than the length dimension of the cylindrical portion is formed, and a shaping for forming a gear portion is formed by reducing the diameter of a part of the cylindrical portion downward from the lower end surface of the recessed portion. A work guide having a through hole having the same diameter as the outer diameter of the cylindrical portion of the substantially cylindrical material is used as the upper mold and is urged downward by a compression coil spring. A forging device, which is mounted in a state in which a punch having the same diameter as the outer diameter of the cylindrical portion of the substantially cylindrical material is slidably held in the through hole of the work guide.
  3. 【請求項3】 上記上金型におけるワークガイドの貫通
    穴の内径口元寸法が、下金型における凹部の内径口元寸
    法より、0.15〜0.25%小さく設定されている請
    求項2記載の鍛造装置。
    3. The inner diameter opening size of the through hole of the work guide in the upper mold is set to be 0.15 to 0.25% smaller than the inner diameter opening size of the recess in the lower mold. Forging equipment.
  4. 【請求項4】 請求項1記載の製法によって得られるこ
    とを特徴とするギヤ部付鍛造品。
    4. A forged product with a gear part, which is obtained by the manufacturing method according to claim 1.
  5. 【請求項5】 賦形されたギヤ部の外径が、円柱部外径
    に対し、絞り率25〜10%で縮径されている請求項4
    記載のギヤ部付鍛造品。
    5. The outer diameter of the shaped gear portion is reduced with respect to the outer diameter of the cylindrical portion at a drawing ratio of 25 to 10%.
    Forged product with gear part as described.
JP2001314270A 2001-10-11 2001-10-11 Method of manufacturing forging with gear part, device used therefor, and forging with gear part obtained therewith Pending JP2003117631A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001314270A JP2003117631A (en) 2001-10-11 2001-10-11 Method of manufacturing forging with gear part, device used therefor, and forging with gear part obtained therewith

Publications (1)

Publication Number Publication Date
JP2003117631A true JP2003117631A (en) 2003-04-23

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Country Link
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011125372A1 (en) * 2010-04-01 2011-10-13 シロキ工業株式会社 Connecting rod and double-sided reclining mechanism
KR101074342B1 (en) * 2008-11-28 2011-10-17 황길수 Method for shaft formation
KR20140091511A (en) * 2014-07-02 2014-07-21 강석순 Press apparatus for forging the major axis
CN103990753A (en) * 2014-05-22 2014-08-20 北京科技大学 Oil pump gear shaft precision-forging forming mold and forming method
CN105057381A (en) * 2015-08-11 2015-11-18 宁波佳比佳工贸有限公司 Cold extruding die capable of changing metallographic streamline mark collecting position of product
CN111266430A (en) * 2018-12-04 2020-06-12 无锡市华机机械制造有限公司 Method for forming rotating shaft for pneumatic actuator

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101074342B1 (en) * 2008-11-28 2011-10-17 황길수 Method for shaft formation
WO2011125372A1 (en) * 2010-04-01 2011-10-13 シロキ工業株式会社 Connecting rod and double-sided reclining mechanism
JP2011214688A (en) * 2010-04-01 2011-10-27 Shiroki Corp Connecting rod and double-sided reclining mechanism
CN102822540A (en) * 2010-04-01 2012-12-12 白木工业株式会社 Connecting rod and double-sided reclining mechanism
US9839291B2 (en) 2010-04-01 2017-12-12 Shiroki Corporation Connecting rod and double reclining mechanism
CN102822540B (en) * 2010-04-01 2015-07-22 白木工业株式会社 Connecting rod and double-sided reclining mechanism
CN103990753A (en) * 2014-05-22 2014-08-20 北京科技大学 Oil pump gear shaft precision-forging forming mold and forming method
KR101634434B1 (en) 2014-07-02 2016-06-30 강석순 Press apparatus for forging the major axis
KR20140091511A (en) * 2014-07-02 2014-07-21 강석순 Press apparatus for forging the major axis
CN105057381A (en) * 2015-08-11 2015-11-18 宁波佳比佳工贸有限公司 Cold extruding die capable of changing metallographic streamline mark collecting position of product
CN105057381B (en) * 2015-08-11 2017-05-24 宁波佳比佳工贸有限公司 Cold extruding die capable of changing metallographic streamline mark collecting position of product
CN111266430A (en) * 2018-12-04 2020-06-12 无锡市华机机械制造有限公司 Method for forming rotating shaft for pneumatic actuator

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