JP2007283391A - Apparatus for forging gears - Google Patents

Apparatus for forging gears Download PDF

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JP2007283391A
JP2007283391A JP2006116474A JP2006116474A JP2007283391A JP 2007283391 A JP2007283391 A JP 2007283391A JP 2006116474 A JP2006116474 A JP 2006116474A JP 2006116474 A JP2006116474 A JP 2006116474A JP 2007283391 A JP2007283391 A JP 2007283391A
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tooth
die
teeth
punch
forming
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JP4764242B2 (en
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Hitoshi Ishida
均 石田
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Cleartec Kk
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Cleartec Kk
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain an apparatus for forging gears, wherein loss in thickness of teeth is prevented and the quality of the formed product is stabilized. <P>SOLUTION: The apparatus for forging the gears is constituted so that an annular die (23) for forging tooth-profile shaped teeth (24) in the inner periphery of a center hole (23a), is pressed into a fastening metal (16), and a punch for pushing a blank (40) having smooth circular shaped outer peripheral surface into the die (23) is provided, wherein the tooth-profile shaped teeth (24) in the die (23), are extension-formed over almost the whole length of the center hole (23a) with the teeth shape almost corresponding to the product, and when the above die (23) is pressed into the fastening metal (16), the blank back-pressure depending on the wear caused by the friction of the tooth-profile shaped teeth at the pushing-into time, is adjusted by making smaller of the pushing-into rate at the blank exhausting side to the pushing-into rate at the blank introducing side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、ギヤ、スプライン軸等を冷間鍛造により成形するギヤ類の鍛造装置に関するものである。 The present invention relates to a gear forging device for forming gears, spline shafts and the like by cold forging.

冷間でギヤを鍛造するものとして、内周に歯形成形歯が形成された環状のダイを締金に嵌合させ、前記ダイに円筒状の素材をパンチにより押し込んで外周に歯を形成する鍛造装置は一般に知られている。 As for forging gears in the cold, forging in which an annular die with teeth forming teeth on the inner periphery is fitted into a clamp, and a cylindrical material is pushed into the die by a punch to form teeth on the outer periphery The device is generally known.

ところで、従来の鍛造装置に使用されているダイは図5に示すようになっていた。即ち、ダイ1の中心孔に形成される歯形成形歯2は、上下中間部の短い区域に製品と対応する歯丈及び断面形状の成形ランド2bを形成し、上部側及び下部側の長い区域に歯丈が前記成形ランド2bから次第に低くなる素材導入斜面2a及び素材排出斜面2cを形成したものであった。 By the way, the die used in the conventional forging apparatus is as shown in FIG. That is, the tooth forming tooth 2 formed in the center hole of the die 1 forms a molding land 2b having a tooth height and a cross-sectional shape corresponding to the product in a short area of the upper and lower intermediate parts, and in a long area on the upper side and the lower side. The material introduction slope 2a and the material discharge slope 2c whose tooth height gradually decreases from the molding land 2b were formed.

前記従来のものは、歯形成形歯2の成形ランド2bが短くなっていたため、素材側に形成される歯の歯形成形歯2に対する摩擦力が小さくなり、押し込み時における歯形成形歯の摩擦による素材背圧を大きくすることができなかった。このため、成形される歯に欠肉が発生し易く、特に、素材の押し込み進行側の歯端部に欠肉が顕著に発生するものであった。このため、欠肉歯の除去分を考慮して長い素材を使用したり、また、歯形成形後に欠肉歯の発生した端部を切断して除去する必要があり、素材の浪費につながるとともに、後処理に手数を要するものであった。さらに、前記成形ランド2bが短くなっていたため、押し込み時に素材が傾き易く、成形品の品質が不安定になるものであった。
特開平11−254083号公報
In the prior art, since the molding land 2b of the tooth forming tooth 2 is shortened, the frictional force of the tooth formed on the material side with respect to the tooth forming tooth 2 is reduced, and the back of the material due to the friction of the tooth forming tooth during pushing is reduced. The pressure could not be increased. For this reason, it is easy to generate a lack of thickness in a tooth to be molded, and particularly, the lack of thickness is remarkably generated at a tooth end portion on the pushing-in progress side of the material. For this reason, it is necessary to use a long material in consideration of the removal of the missing teeth, and it is necessary to cut and remove the end portion where the missing teeth occur after the tooth formation, leading to waste of the material, The post-processing is troublesome. In addition, since the molding land 2b is shortened, the material tends to tilt when pushed in, and the quality of the molded product becomes unstable.
JP 11-240883 A

本発明は、歯の欠肉発生を防止するとともに、成形品の品質が安定する新規なギヤ類の鍛造装置を得ることを目的とする。 It is an object of the present invention to obtain a novel gear forging device that prevents the occurrence of missing teeth and stabilizes the quality of a molded product.

本発明は、前記目的を達成するために以下の如く構成したものである。即ち、中心孔の内周に歯形成形歯が形成された環状のダイを締金に圧入し、平滑な円形の外周面を有する素材を前記ダイに押し込むパンチを設けてなるギヤ類の鍛造装置において、前記ダイの歯形歯形成形歯を、製品と略対応する歯形で前記中心孔の略全長に亘たって延出形成し、前記ダイを締金に圧入する際に、素材排出側の圧入率を素材導入側の圧入率に対して小さくすることで、押し込み時における歯形成形歯の摩擦による素材背圧を調整する構成にしたものである。 The present invention is configured as follows to achieve the above object. That is, in a gear forging device provided with a punch for press-fitting a material having a smooth circular outer peripheral surface into the die by press-fitting an annular die having teeth forming teeth on the inner periphery of the center hole into the clamp The tooth profile of the die is formed so as to extend over the entire length of the center hole with a tooth profile substantially corresponding to the product, and when the die is press-fitted into the clamp, the press-fitting rate on the material discharge side is determined as the material. By making it smaller than the press-fitting rate on the introduction side, the material back pressure due to the friction of the tooth forming teeth at the time of pushing is adjusted.

パンチによって素材がダイに押し込まれると、ダイの歯形成形歯によって素材の外周部に歯が形成される。この場合、前記歯形成形歯は中心孔の略全長に亘たって製品と略対応する歯形となっているので、素材に形成される歯がダイ側の歯形成形歯に大きな摩擦力で接触し、押し込み時における歯形成形歯の摩擦による素材背圧が高くなる。これにより、素材に形成される歯は、全長に亘たって歯形成形歯の歯形が高精度に転写されることになる。しかも、前記歯形成形歯は中心孔の略全長に亘たって延びているので、素材を同軸に保持する保持力が増し、成形品の品質が安定することになる。 When the material is pushed into the die by the punch, teeth are formed on the outer peripheral portion of the material by the teeth forming teeth of the die. In this case, the tooth forming tooth has a tooth shape substantially corresponding to the product over substantially the entire length of the center hole, so that the tooth formed on the material contacts the tooth forming tooth on the die side with a large frictional force and pushes in. The material back pressure due to the friction of the tooth forming teeth at the time increases. As a result, the tooth shape of the tooth forming tooth is transferred with high accuracy over the entire length of the tooth formed on the material. In addition, since the tooth forming teeth extend over substantially the entire length of the center hole, the holding force for holding the material coaxially increases, and the quality of the molded product is stabilized.

以下本発明の実施の形態を図面に基いて説明する。図において、図1は本発明による鍛造装置の断面図、図2は図1の要部拡大断面図、図3は本発明によるダイの要部拡大断面端面図、図4は図3のIV-IV線による部分展開図である。 Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view of a forging device according to the present invention, FIG. 2 is an enlarged cross-sectional view of the main part of FIG. 1, FIG. 3 is an enlarged cross-sectional end view of the main part of the die according to the present invention, and FIG. It is the partial expanded view by IV line.

図1において、10は鍛造装置であり、ダイユニット11及びパンチユニット30により構成されている。ダイユニット11は、受金12に環状のセンターブロック13及び下部周リング14を同軸に嵌合させて載置するとともに、該受金12の軸心部にカウンタパンチ15を起立固定する。また、前記センターブロック13及び下部周リング14の上に環状の内締金16、外締金18、及び上部周リング19を同軸に圧入して載置し、これらを大径の保持リング20により締め付けて一体化する。 In FIG. 1, reference numeral 10 denotes a forging device, which includes a die unit 11 and a punch unit 30. In the die unit 11, an annular center block 13 and a lower peripheral ring 14 are coaxially fitted and placed on a metal receiver 12, and a counter punch 15 is erected and fixed to an axial center portion of the metal receiver 12. An annular inner clamp 16, an outer clamp 18, and an upper peripheral ring 19 are coaxially press-fitted and placed on the center block 13 and the lower peripheral ring 14, and these are held by a large-diameter holding ring 20. Tighten and integrate.

前記内締金16は、その軸心部に保持孔17を形成し、該保持孔17の上部17aに円筒状のガイド22を、下部17bにダイ23を嵌合させる。前記保持孔17の上部17aは上方に向かって大きい角度(3〜5度)で縮小するテーパー孔とし、この部に前記ガイド22をテーパー嵌合させる。また、前記保持孔の下部17bは、複合のテーパー孔にする。即ち、図2に示すように、下部17b全体を上方に向かって小さい角度(1〜2度)で縮小するテーパー孔にするとともに、後述する歯形成形歯24の素材導入斜面24aに対応する上段17b−1を下段17b−3に対して段状に小径、本例では約0.1mmの段差で小径にし、上段17b−1と下段17b−3とを小幅な中段17b−2により滑らかに接続する。 The inner clamp 16 is formed with a holding hole 17 at its axial center, and a cylindrical guide 22 is fitted into the upper part 17a of the holding hole 17 and a die 23 is fitted into the lower part 17b. The upper portion 17a of the holding hole 17 is a tapered hole that shrinks upward at a large angle (3 to 5 degrees), and the guide 22 is taper-fitted to this portion. The lower portion 17b of the holding hole is a compound taper hole. That is, as shown in FIG. 2, the entire lower portion 17b is formed into a tapered hole that shrinks upward at a small angle (1 to 2 degrees), and an upper stage 17b corresponding to a material introduction slope 24a of a tooth forming tooth 24 described later. -1 with a small diameter stepwise with respect to the lower step 17b-3, in this example, with a step of about 0.1 mm, the upper step 17b-1 and the lower step 17b-3 are smoothly connected by a small middle step 17b-2. .

前記ダイ23の中心孔23aの内周にヘリカルギヤ形成用の歯形成形歯24を形成する。該歯形成形歯24は、図3、図4に示すように、素材が押し込まれる上端部を、歯丈が上端に向かって次第に低くなる素材導入斜面24aにし、該素材導入斜面24aから中心孔23aの下端部に至る前段歯形成形歯24b,及び後段歯形成形歯24cは歯丈及び歯厚が変化しない製品と略同一の歯形にする。前記素材導入斜面24aは、図4に示すように、歯形成形歯24の延長する線Lに対して歯厚方向に略直交する面(歯直角となる面)に形成する。 Tooth-forming teeth 24 for forming a helical gear are formed on the inner periphery of the center hole 23a of the die 23. As shown in FIGS. 3 and 4, the tooth-forming tooth 24 has an upper end portion into which the material is pushed into a material introduction inclined surface 24 a whose tooth height gradually decreases toward the upper end, and the center hole 23 a extends from the material introduction inclined surface 24 a. The front teeth forming teeth 24b and the rear teeth forming teeth 24c reaching the lower end of the tooth have substantially the same tooth profile as that of the product whose tooth height and tooth thickness do not change. As shown in FIG. 4, the material introduction inclined surface 24 a is formed on a surface (surface perpendicular to the tooth) that is substantially orthogonal to the tooth thickness direction with respect to the line L that the tooth forming tooth 24 extends.

前記ダイ23の外周は、上方に向かって小さい角度(1〜2度)で縮小する単純なテーパー面にするとともに、その外径は前記保持孔17の下部17bの内径よりも若干大径、本例では0.4mm大径にして前記下部17bに圧入する。これにより、前記保持孔17に対し、ダイ23の上部が圧入率0.5%〜0.6%、ダイ23の下部がこれよりも小さい圧入率となるようにし、図2の仮想線−実線で示すように、内締金16に圧入した際に、ダイ23の上部を下部よりも若干大きく軸心方向に弾性変形させる。 The outer periphery of the die 23 is a simple taper surface that decreases at a small angle (1 to 2 degrees) upward, and its outer diameter is slightly larger than the inner diameter of the lower portion 17b of the holding hole 17. In the example, it is 0.4 mm in diameter and press-fitted into the lower part 17b. Accordingly, the upper portion of the die 23 has a press-in rate of 0.5% to 0.6% and the lower portion of the die 23 has a lower press-in rate than the holding hole 17, and the phantom line-solid line in FIG. As shown in FIG. 6, when the inner clamp 16 is press-fitted, the upper portion of the die 23 is elastically deformed in the axial direction slightly larger than the lower portion.

前記圧入率の変化は、素材40をダイ23に押し込む(打ち込む)際における歯形成形歯の摩擦による素材背圧を調整し、素材の外周の肉を歯形成形歯24に円滑に充満させて該歯形成形歯24の歯形を素材に高精度に転写させるためのものである。圧入率を前記の如く変化させないと、素材40と歯形成形歯24との摩擦力が大きくなり過ぎて前記素材背圧が異常に上昇し、ダイ23が損傷したり、素材がダイ23に押し込まれなくなったりする。本発明は、ダイ23下部の圧入率を上部の圧入率よりも小さくすることで前記素材背圧を調整する。これにより、ダイの下部側に油圧等で作動する素材背圧調整用の部材を省略し、構造を簡素にする。 The change in the press-fitting rate is achieved by adjusting the material back pressure due to the friction of the tooth forming teeth when the material 40 is pushed (dried) into the die 23, and smoothly filling the tooth forming teeth 24 with the meat on the outer periphery of the material. This is for transferring the tooth profile of the molded tooth 24 onto the material with high accuracy. If the press-in rate is not changed as described above, the frictional force between the material 40 and the tooth forming teeth 24 becomes too large, the material back pressure rises abnormally, the die 23 is damaged, or the material is pushed into the die 23. It will disappear. In the present invention, the material back pressure is adjusted by making the press-fit rate of the lower portion of the die 23 smaller than the press-fit rate of the upper portion. This eliminates a material back pressure adjusting member that is operated by hydraulic pressure or the like on the lower side of the die, thereby simplifying the structure.

図1において、27は外締金18と上部周リング19との間に形成した熱交換用の環状の水室であり、上部周リング19の側部に形成した供給口27a、排出口27bを介して前記水室27に温水又は冷却水を流通させる。本例では、成形開始時に、前記水室27に温水を流通させて内締金16、外締金18を介してガイド22及びダイ23を45℃〜65℃に予熱し、成形が開始された後は前記水室27に冷却水を流通させて前記ガイド22及びダイ23を100℃以下に保持し、素材−金型間の摩擦係数を管理する。これによって素材40の成形が円滑に行えるようにする。なお、28はセンターブロック13に形成した成形品切り離し用のエア噴出路である。 In FIG. 1, reference numeral 27 denotes an annular water chamber for heat exchange formed between the outer clamp 18 and the upper peripheral ring 19. A supply port 27 a and a discharge port 27 b formed on the side of the upper peripheral ring 19 are provided. Then, warm water or cooling water is circulated through the water chamber 27. In this example, at the start of molding, warm water was circulated through the water chamber 27, the guide 22 and the die 23 were preheated to 45 ° C. to 65 ° C. via the inner clamp 16 and the outer clamp 18, and molding was started. After that, cooling water is circulated in the water chamber 27 to keep the guide 22 and the die 23 at 100 ° C. or less, and the friction coefficient between the material and the mold is managed. As a result, the material 40 can be smoothly molded. Reference numeral 28 denotes an air ejection path for separating a molded product formed in the center block 13.

前述したカウンターパンチ15は、ガイド22に嵌合する上部15aを小径に、ダイ23に嵌合する中間部15bを大径に形成するとともに、両者の連結部を前述した歯形成形歯24の素材導入斜面24a部に位置させ、この部を下方に向かって拡開するテーパー部15cに形成する。 The counter punch 15 has an upper portion 15a fitted to the guide 22 having a small diameter and an intermediate portion 15b fitted to the die 23 having a large diameter. The taper portion 15c is formed in a tapered portion 15c that is located on the slope 24a portion and expands downward.

前述したダイユニット11の上方にパンチユニット30を設ける。該パンチユニット30は、ラム31によって上下動されるパンチホルダー32の軸心部に円筒状のパンチ33を下方に向けて突出固定し、該パンチ33の外周に円筒状の位置決め部材34を嵌合させて前記パンチホルダー32に係止する。前記パンチ33は、下方に移動された際に、ダイユニット11のガイド22とカウンターパンチ15上部との間隙部に嵌合可能なっている。また、前記位置決め部材34は、前記パンチ33が下方に所定量移動した際にガイド22の上面に当接して該パンチ33の下死点位置を確認するためのものである。 A punch unit 30 is provided above the die unit 11 described above. The punch unit 30 has a cylindrical punch 33 projecting and fixed downward on the axial center of a punch holder 32 moved up and down by a ram 31, and a cylindrical positioning member 34 is fitted to the outer periphery of the punch 33. The punch holder 32 is engaged. When the punch 33 is moved downward, the punch 33 can be fitted into a gap between the guide 22 of the die unit 11 and the upper portion of the counter punch 15. The positioning member 34 is for contacting the upper surface of the guide 22 and confirming the bottom dead center position of the punch 33 when the punch 33 moves downward by a predetermined amount.

前記パンチ33は、短尺かつ円筒状の素材40(40−1,40−2,40−3)をガイド22とカウンターパンチ15との間隙部に順次間欠的に押し込む。この場合、前記パンチ33の下死点位置は以下の如く設定されている。即ち、下段の素材40−1が前記ダイ23の素材導入斜面24aの下部、即ち、図2に示す頂部(成形ランド相当)24a−1を通過して残余の歯形成形歯24c上に位置し、中段の素材40−2の下端(前進端)が前記素材導入斜面24aの下部点M(図2)に到来した時点をパンチ33の下死点位置とし、前記中段の素材40−2をここで一時停止させる。これにより、ダイ23によって成形される製品(ヘリカルギヤ)41の歯に、素材の移動中断による継ぎ目模様が発生しなくなる。 The punch 33 intermittently pushes the short and cylindrical material 40 (40-1, 40-2, 40-3) sequentially into the gap between the guide 22 and the counter punch 15. In this case, the bottom dead center position of the punch 33 is set as follows. That is, the lower material 40-1 passes through the lower part of the material introduction slope 24a of the die 23, that is, the top (corresponding to the molding land) 24a-1 shown in FIG. When the lower end (advance end) of the middle stage material 40-2 arrives at the lower point M (FIG. 2) of the material introduction slope 24a, the bottom dead center position of the punch 33 is set, and the middle stage material 40-2 is here. Pause. Thereby, the joint pattern due to the interruption of the movement of the material does not occur on the teeth of the product (helical gear) 41 formed by the die 23.

前記実施例によれば、パンチ33によって素材40がダイ23に押し込まれると、ダイ23の歯形成形歯24によって素材40の外周部に歯が形成される。この場合、前記歯形歯形成形歯24は中心孔23aの略全長に亘たって製品と略対応する歯形となっているので、素材40に形成される歯が前記歯形成形歯24に大きな摩擦力で接触し、押し込み時における歯形成形歯の摩擦による素材背圧が高くなる。これにより、素材40に形成される歯は、全長に亘たって歯形成形歯24の歯形が高精度に転写されることになる。さらに、前記歯形成形歯24が中心孔23aの略全長に亘たって延びているので、素材40を同軸に保持する保持力が増し、成形品の品質が安定することになる。 According to the embodiment, when the material 40 is pushed into the die 23 by the punch 33, teeth are formed on the outer peripheral portion of the material 40 by the tooth forming teeth 24 of the die 23. In this case, the tooth profile forming tooth 24 has a tooth profile substantially corresponding to the product over substantially the entire length of the center hole 23a, so that the tooth formed on the material 40 contacts the tooth forming tooth 24 with a large frictional force. In addition, the material back pressure due to the friction of the tooth forming teeth at the time of pushing increases. As a result, the tooth shape of the tooth forming tooth 24 is transferred with high accuracy over the entire length of the teeth formed on the material 40. Furthermore, since the tooth forming teeth 24 extend over substantially the entire length of the center hole 23a, the holding force for holding the material 40 coaxially increases, and the quality of the molded product is stabilized.

なお、前述した素材40は充実した円柱状にしてもよい。この場合、カウンターパンチ15は省略する。また、平歯ギヤを形成する場合は、前記歯形成形歯24を軸方向に直線に延びるストレート状とする。 Note that the material 40 described above may be a solid cylinder. In this case, the counter punch 15 is omitted. Further, when forming a spur gear, the tooth-forming teeth 24 are formed in a straight shape extending linearly in the axial direction.

本発明による鍛造装置の断面図である。It is sectional drawing of the forging apparatus by this invention. 図1の要部拡大断面図である。It is a principal part expanded sectional view of FIG. 本発明によるダイの要部拡大断面端面図である。It is a principal part expanded sectional end view of the die | dye by this invention. 図3のIV-IV線による部分展開図である。FIG. 4 is a partial development view taken along line IV-IV in FIG. 3. 従来による歯形成形歯の断面端面図である。It is a cross-sectional end view of a conventional tooth forming tooth.

符号の説明Explanation of symbols

10 鍛造装置
11 ダイユニット
12 受金
13 センターブロック
14 下部周リング
15 カウンターパンチ
16 内締金
17 保持孔
17a 上部
17b 下部
17b−1 上段
17b−2 中段
17b−3 下段
18 外締金
19 上部周リング
20 保持リング
22 ガイド
23 ダイ
23a 中心孔
24 歯形成形歯
24a 素材導入斜面
24b 前段歯形成形歯
24c 後段歯形成形歯
26 リングナット
27 水室
27a 供給口
27b 排出口
28 エア噴出路
30 パンチユニット
31 ラム
32 パンチホルダー
33 パンチ
34 位置決め部材
40(40−1,40−2,40−3) 素材
41 製品(ヘリカルギヤ)
DESCRIPTION OF SYMBOLS 10 Forging device 11 Die unit 12 Receptacle 13 Center block 14 Lower peripheral ring 15 Counter punch 16 Inner clamp 17 Holding hole 17a Upper part 17b Lower part 17b-1 Upper stage 17b-2 Middle stage 17b-3 Lower stage 18 Outer clamp 19 Upper peripheral ring 20 retaining ring 22 guide 23 die 23a central hole 24 tooth forming tooth 24a material introduction slope 24b front tooth forming tooth 24c rear tooth forming tooth 26 ring nut 27 water chamber 27a supply port 27b discharge port 28 air ejection path 30 punch unit 31 ram 32 Punch holder 33 Punch 34 Positioning member 40 (40-1, 40-2, 40-3) Material 41 Product (helical gear)

Claims (1)

中心孔(23a)の内周に歯形成形歯(24)が形成された環状のダイ(23)を締金(16)に圧入し、平滑な円形の外周面を有する素材(40)を前記ダイ(23)に押し込むパンチを設けてなるギヤ類の鍛造装置において、前記ダイ(23)の歯形成形歯(24)を、製品と略対応する歯形で前記中心孔(23a)の略全長に亘たって延出形成し、前記ダイ(23)を締金(16)に圧入する際に、素材排出側の圧入率を素材導入側の圧入率に対して小さくすることで、押し込み時における歯形成形歯の摩擦による素材背圧を調整したことを特徴とするギヤ類の鍛造装置。 An annular die (23) having tooth-forming teeth (24) formed on the inner periphery of the center hole (23a) is press-fitted into the clamp (16), and a material (40) having a smooth circular outer peripheral surface is inserted into the die. In the gear forging device provided with a punch to be pushed into (23), the tooth-forming tooth (24) of the die (23) is extended substantially over the entire length of the center hole (23a) with a tooth profile substantially corresponding to the product. When forming the extension and press-fitting the die (23) into the clamp (16), by reducing the press-in rate on the raw material discharge side relative to the press-in rate on the raw material introduction side, Gear forging device characterized by adjusting the material back pressure due to friction.
JP2006116474A 2006-04-20 2006-04-20 Gear forging equipment Active JP4764242B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006116474A JP4764242B2 (en) 2006-04-20 2006-04-20 Gear forging equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006116474A JP4764242B2 (en) 2006-04-20 2006-04-20 Gear forging equipment

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Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013000782A (en) * 2011-06-17 2013-01-07 Toyota Motor Corp Serration molding method and serration bolt

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07328740A (en) * 1994-06-06 1995-12-19 Akamatsu Fuooshisu Kk Manufacture of helical gear
JP2002120038A (en) * 2000-08-11 2002-04-23 Sawai Narejji Laboratory:Kk Extrusion method of helical gear

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07328740A (en) * 1994-06-06 1995-12-19 Akamatsu Fuooshisu Kk Manufacture of helical gear
JP2002120038A (en) * 2000-08-11 2002-04-23 Sawai Narejji Laboratory:Kk Extrusion method of helical gear

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013000782A (en) * 2011-06-17 2013-01-07 Toyota Motor Corp Serration molding method and serration bolt

Also Published As

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