JP3784043B2 - Forging molding method for molded products with dog teeth - Google Patents

Forging molding method for molded products with dog teeth Download PDF

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Publication number
JP3784043B2
JP3784043B2 JP27787899A JP27787899A JP3784043B2 JP 3784043 B2 JP3784043 B2 JP 3784043B2 JP 27787899 A JP27787899 A JP 27787899A JP 27787899 A JP27787899 A JP 27787899A JP 3784043 B2 JP3784043 B2 JP 3784043B2
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Japan
Prior art keywords
dog teeth
dog
preliminary
tooth
teeth
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JP27787899A
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Japanese (ja)
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JP2001105091A (en
Inventor
正孝 田上
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Musashi Seimitsu Industry Co Ltd
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Musashi Seimitsu Industry Co Ltd
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Priority to JP27787899A priority Critical patent/JP3784043B2/en
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Description

【0001】
【産業上の利用分野】
本発明は、例えばトランスミッション等で同期を取るためのドグ歯を有するドグ歯付き成形品の鍛造成形方法に関する。
【0002】
【従来の技術】
自動車のトランスミッションには、図7の(ウ)に示す如き動力伝達用のヘリカル歯109とシンクロ用のスプライン状ドグ歯103を備えた歯車131が使用されることがある。この歯車131のドグ歯103は、軸線方向端部にV字状に突出する案内用のチャンファ104を備える。
【0003】
このようなヘリカル歯109とドグ歯103を設けた歯車131を成形する場合、予め図7の(ア)に示す如きリング状のブランク材101に鍛造成形を施し、図7の(イ)に示す如き外周に複数のドグ歯103を備えたドグ歯付き成形品121を形成後、ヘリカル歯109をホブ加工により成形し、図7の(ウ)に示す如き歯車131を形成していた。
【0004】
ここで上記ドグ歯103を鍛造成形するとき、所望するドグ歯103と同一形状の空間を形成する成形歯型にブランク材101を流動させてドグ歯103を成形するが、ドグ歯103の、特に軸線方向にV字状に突出するチャンファ104の先端部分は漸次幅が狭くなるため、ブランク材101の肉の流動が不足しがちで成形歯型のコーナーと対向する外周側で欠肉となりやすく、不良が発生するということがある。
【0005】
そこでこのようなドグ歯103の鍛造成形におけるチャンファ104の欠肉を抑制するため、図8に示す如くドグ歯203を鍛造成形することが行われる。つまり、図8の(ア)に示す如きリング状のブランク材201から、ドグ歯203が隣接する内周隣接部210より軸線方向に突出し、所望するドグ歯203より軸線方向に長い予備ドグ歯203aを有する予備成形品211(図8の(イ))成形後、予備ドグ歯203aを軸線方向に押圧圧縮して所望するドグ歯203を有するドグ歯付き成形品221(図8の(ウ))を成形していた。尚、その後、ドグ歯付き成形品221の大径部206にホブ加工でヘリカル歯209を切リ、歯車231(図8の(エ))を成形する。
【0006】
【発明が解決しようとする課題】
上述の如く、所望するドグ歯203より軸線方向に長い予備ドグ歯203aを軸線方向に押圧圧縮してドグ歯203を成形することにより、鍛造肉の流動が不足しがちな予備チャンファ204aの先端部分を再度押圧し、ドグ歯203を成形できるため、ドグ歯203に欠肉が発生することを抑制できる。しかし、図9の(ア)に示す如く、ブランク材201から鍛造成形された予備成形品211は、予備ドグ歯203a付近の鍛造フローが大径部206側から予備ドグ歯203a、更に内周隣接部210へと連続する。そのため後工程で、内周隣接部210より軸線方向に突出する予備ドグ歯203aを内周隣接部210まで押圧すると、均一に突出していた肉が内部に圧縮されるため、図9の(イ)に示す如く、成形されたドグ歯203から内周隣接部210への鍛造フローがチャンファ204付近で切断され、ドグ歯203の強度が低下するということがあった。
【0007】
従って、本発明は上述の如き課題を解決し、ドグ歯の先端に欠肉が発生することがなく、強度の高いドグ歯付き成形品の鍛造成形方法を提供することを目的とする。
【0008】
【課題を解決するための手段】
本発明は以下のとおりである。
【0009】
軸線方向端部にV字状に突出する案内用のチャンファを備えるドグ歯を、外周に複数設けたドグ歯付き成形品の鍛造成形方法において、隣接する内周隣接部より軸線方向に突出する予備ドグ歯で、予備ドグ歯の突出側に、内周隣接部から予備ドグ歯の突出する端面まで径方向に傾斜する傾斜部と、傾斜部から予備ドグ歯の径方向終端まで連続して軸線垂直方向に延びる突出端部とを有し、傾斜部及び突出端部が、形成されるドグ歯の軸線方向にのみ突出する予備ドグ歯を形成する第一工程と、予備ドグ歯の突出する端部が内周隣接部から突出しない位置まで押圧圧縮してドグ歯を成形する第二工程とからなる。
【0010】
【実施例】
以下、本発明の実施例を図1乃至図6に基づいて説明する。
【0011】
図1の(エ)は歯車31で、大径の大径部6に動力伝達用のヘリカル歯9、大径部6より小径の小径部7にシンクロ用でスプライン状のドグ歯3を備える。また、歯車31の中心には軸線方向に貫通する貫通孔2、ヘリカル歯9側端面には周状に凹んだ肉抜部8が設けられている。
【0012】
次に上記歯車31の成形工程を順次説明する。
【0013】
まず、図1の(ア)に示す如く、所望する歯車31の体積より若干大なる体積を有するリング状のブランク材1に鍛造成形を施して、図1の(イ)に示す如き、予備成形品11を成形する。この予備成形品11を成形する成形工程を図2乃至図5に基づいて説明する。
【0014】
図3において、40は鍛造装置で、下型51と、同一軸線上に配置される上型41とからなる。
【0015】
下型51は、その軸心に沿ってブランク材1の外径と略同一のマンドレル52と、マンドレル52の外周側には、マンドレル52と同心状でリング形状のノックアウトリング53を介してダイス54が配置される。ダイス54には、その中心を貫通する中心孔59が形成され、中心孔59は上端から大径内孔59a、大径内孔59aから連続して中心側へ延出する段状の第一肩部58a、第一肩部58aから連続して軸線方向へ延出する中間内孔59b、中間内孔59bから連続して中心側へ延出する段状の第二肩部58b、及び第二肩部58bから連続して下端まで延びる小径内孔59cからなる。中心孔59の中間内孔59b内周には、図4及び図5に示す如く、予備成形品11の予備ドグ歯3aを成形する予備成形歯型55が、周方向に均等な間隔をおいて複数設けられている。この予備成形歯型55の底部は、第二肩部58bより低い位置に形成され、内周側に第二肩部58bに向かって傾斜する傾斜成形部56aを有する。また、予備成形歯型55の底部は、周方向にV字状の予備チャンファ成形部56を有する。そして、図3に示す如く、ダイス54とマンドレル52との間に配置されるノックアウトリング53は、鍛造成形された予備成形品11を下型51から取り出すため、上下方向に移動可能である。上記ダイス54、ノックアウトリング53及びマンドレル52により、ブランク材1を投入する型彫空間57が画成される。
【0016】
上型41は、下型51の型彫空間57に対向してリング状のパンチ42が配置され、パンチ42の下側先端には予備成形品11の肉抜部8と同一の外形状を有する押圧凸部43、内周にはマンドレル52に嵌挿されるパンチ穴44が設けられている。また、パンチ42の上側には、スペーサ46及びバックアップリング47が配置され、その外周側に設置されるパンチガイド45にて、一体に組付けられる。
【0017】
上記鍛造装置40でブランク材1から予備成形品11を成形する工程を説明すると、まず図3左半部に示す如く、上型41を上方に退避させた状態で、下型51に画成された型彫空間57にブランク材1を投入する。続いて、上型41が下降し、パンチ42がブランク材1を上方より押圧する。ここで、予備成形歯型55内を流動する鍛造肉は、軸線方向に延出し、図3右半部に示す如く、予備チャンファ成形部56まで充填される。このように成形された予備成形品11は、予備ドグ歯3aが隣接する内周隣接部10より軸線方向に突出し、内周隣接部10から予備ドグ歯3aの突出する端面まで径方向に傾斜する傾斜部5を有する。そしてその後、上型41を上方へ退避させるとともにノックアウトリング53を上昇させて、下型51の型彫空間57から予備成形品11を取り出して、予備成形品11の成形が完了する。
【0018】
このように成形される予備成形品11の、特に予備ドグ歯3a付近の鍛造フローは、図2の(ア)に示す如く、大径部6端面から予備ドグ歯3aを軸線方向に延び、予備チャンファ4aを内周方向に傾斜部5に倣って内周隣接部10まで連続する。
【0019】
そして上述の如く成形した予備成形品11の予備ドグ歯3aにサイジング加工を施して、図1の(ウ)に示す如き、ドグ歯3を有するドグ歯付き成形品21を成形する。このドグ歯付き成形品21を成形する成形工程を図6に基づいて説明する。
【0020】
図6において、70はサイジング装置で、下型81と、同一軸線上に配置される上型71とからなる。
【0021】
下型81は、その軸心に沿ってノックアウトピン82と、ノックアウトピン82の外周上側に同心状にダイス84、外周下側にダイス84を支持するベース90が配置される。また、ダイス84の内周上部及びノックアウトピン82の上端部により型彫空間87が画成され、ダイス84の内周上端には、所望するドグ歯3と略同一形状の成形歯型85が、周方向に均等な間隔をおいて複数設けられている。そしてノックアウトピン82は、サイジング加工されたドグ歯付き成形品21を下型81から取り出すため、上下方向に移動可能である。
【0022】
上型71は、下型81の型彫空間87に対向してリング状のパンチ72が配置され、パンチ72の下側先端には予備成形品11の肉抜部8と同一の外形状を有する押圧凸部73、内周にはマンドレル82に嵌挿されるパンチ穴74が設けられている。また、パンチ72の上側には、スペーサ76及びバックアップリング77が配置され、その外周側に設置されるパンチガイド75にて、一体に組付けられる。
【0023】
上記サイジング装置70で予備成形品11からドグ歯付き成形品21を成形する工程を説明すると、まず図6左半部に示す如く、上型71を上方へ退避させた状態で、ダイス84の成形歯型85に予備ドグ歯3aが合致するように位置合わせをした予備成形品11を載置する。続いて、上型71が下降し、パンチ72が予備成形品11を上方より押圧し、ダイス84の成形歯型85に合わせて予備ドグ歯3aを軸線方向に押圧圧縮して所望するドグ歯3を有するドグ歯付き成形品21を成形する。そしてその後、上型71を上方へ退避させるとともにノックアウトピン82を上昇させて、下型81からドグ歯付き成形品21を取り出して、ドグ歯付き成形品21の成形が完了する。
【0024】
このように成形されるドグ歯付き成形品21は、図2の(ア)に示す成形前の予備ドグ歯3a付近の鍛造フローが傾斜部5に倣って内周隣接部10まで連続しているので、押圧圧縮される予備ドグ歯3aの内周隣接部10側の圧縮量が予備ドグ歯3aの外周側の圧縮量に比べて少なく、そのため図2の(イ)に示す如く、サイジング加工されたドグ歯3付近の鍛造フローはドグ歯3から内周隣接部10にかけて大部分連続する。
【0025】
その後最後に、ドグ歯付き成形品21の大径部6に、ホブ加工によりヘリカル歯9を成形し、図1の(エ)に示す如く、歯車31を成形する。
【0026】
尚、上記実施例ではドグ歯3と内周隣接部10が同一高さにしたが、ドグ歯3は内周隣接部10より軸線方向に凹んでいても良い。このようにドグ歯3が凹んでいると、チャンファ4側で若干鍛造フローが切れるが、その他の部分で鍛造フローが切れることはない。
【0027】
また、上記実施例では、ドグ歯3をサイジング加工後、ヘリカル歯9をホブ加工で成形したが、ヘリカル歯9も鍛造で成形しても良い。
【0028】
【発明の効果】
以上のように本発明によれば、軸線方向端部にV字状に突出する案内用のチャンファを備えるドグ歯を、外周に複数設けたドグ歯付き成形品の鍛造成形方法において、隣接する内周隣接部より軸線方向に突出する予備ドグ歯で、予備ドグ歯の突出側に、内周隣接部から予備ドグ歯の突出する端面まで径方向に傾斜する傾斜部と、傾斜部から予備ドグ歯の径方向終端まで連続して軸線垂直方向に延びる突出端部とを有し、傾斜部及び突出端部が、形成されるドグ歯の軸線方向にのみ突出する予備ドグ歯を形成する第一工程と、予備ドグ歯の突出する端部が内周隣接部から突出しない位置まで押圧圧縮してドグ歯を成形する第二工程とからなるため、押圧圧縮される予備ドグ歯の内周隣接部側の圧縮量が予備ドグ歯の外周側の圧縮量に比べて少なく、成形されたドグ歯付近の鍛造フローはドグ歯から内周隣接部にかけて大部分連続するので、鍛造フローが切れてドグ歯の強度が低下することを抑制できる。またドグ歯の先端外周側を特に押圧圧縮するため、欠肉のない所望するドグ歯を成形できる。
【図面の簡単な説明】
【図1】本発明の実施例による歯車を成形する工程を表す断面平面図である。
【図2】図2の(ア)は図1のB部に成形される予備ドグ歯付近の断面図、図2の(イ)は図1のC部に成形されるドグ歯付近の断面図である。
【図3】本発明の実施例のブランク材から予備成形品を成形する第一工程を表し、左半部は成形前、右半部は成形後の状態を表す部分断面平面図である。
【図4】図3のA部拡大図である。
【図5】図2のA部付近の斜視図である。
【図6】本発明の実施例の予備成形品からドグ歯付き成形品を成形する第二工程を表し、左半部は成形前、右半部は成形後の状態を表す部分断面平面図である。
【図7】従来の歯車を成形する工程を表す断面平面図である。
【図8】従来の歯車を成形する他の工程を表す断面平面図である。
【図9】図9の(ア)は図8のD部に成形される予備ドグ歯付近の断面図、図9の(イ)は図8のE部に成形されるドグ歯付近の断面図である。
【符号の説明】
3 ドグ歯
3a 予備ドグ歯
4 チャンファ
5 傾斜部
10 内周隣接部
[0001]
[Industrial application fields]
The present invention relates to a method for forging a molded product with dog teeth having dog teeth for synchronizing with a transmission or the like, for example.
[0002]
[Prior art]
A gear 131 including a helical tooth 109 for power transmission and a spline-like dog tooth 103 for synchronization as shown in FIG. The dog tooth 103 of the gear 131 includes a guide chamfer 104 that protrudes in a V shape at the end in the axial direction.
[0003]
When the gear 131 provided with the helical teeth 109 and the dog teeth 103 is formed, the ring-shaped blank 101 as shown in FIG. 7A is forged, and the gear 131 shown in FIG. After forming a dog-tooth molded product 121 having a plurality of dog teeth 103 on the outer periphery as described above, the helical teeth 109 were formed by hobbing to form a gear 131 as shown in FIG.
[0004]
Here, when the dog tooth 103 is forged, the blank 101 is flowed into a forming tooth mold that forms a space having the same shape as the desired dog tooth 103, and the dog tooth 103 is formed. Since the tip portion of the chamfer 104 that protrudes in a V shape in the axial direction gradually decreases in width, the flow of the blank of the blank material 101 tends to be insufficient, and tends to be thin on the outer peripheral side facing the corner of the molded tooth mold, A defect may occur.
[0005]
Therefore, in order to suppress the lack of the chamfer 104 in the forging of the dog teeth 103, the dog teeth 203 are forged as shown in FIG. That is, from the ring-shaped blank material 201 as shown in FIG. 8A, the dog teeth 203 protrude in the axial direction from the adjacent inner peripheral adjacent portions 210 and are longer in the axial direction than the desired dog teeth 203. A preform 221 having a desired dog tooth 203 is formed by pressing and compressing the preliminary dog teeth 203a in the axial direction after forming the preform 211 having a desired shape (FIG. 8B). Was molded. Thereafter, the helical teeth 209 are cut by hobbing on the large diameter portion 206 of the molded product 221 with dog teeth, and the gear 231 ((D) in FIG. 8) is formed.
[0006]
[Problems to be solved by the invention]
As described above, by forming the dog teeth 203 by pressing and compressing the preliminary dog teeth 203a that are longer in the axial direction than the desired dog teeth 203, the tip portion of the preliminary chamfer 204a that tends to have insufficient forged meat flow. Can be pressed again to form the dog teeth 203, so that it is possible to prevent the dog teeth 203 from being thin. However, as shown in FIG. 9A, the preform 211 forged from the blank 201 has a forging flow in the vicinity of the preliminary dog teeth 203a from the large diameter portion 206 side to the preliminary dog teeth 203a and further adjacent to the inner periphery. It continues to the part 210. For this reason, when the preliminary dog teeth 203a protruding in the axial direction from the inner peripheral adjacent portion 210 are pressed to the inner peripheral adjacent portion 210 in the subsequent process, the uniformly protruding meat is compressed into the inner portion, so that FIG. As shown in FIG. 4, the forging flow from the formed dog tooth 203 to the inner peripheral adjacent portion 210 is cut in the vicinity of the chamfer 204, and the strength of the dog tooth 203 may be reduced.
[0007]
Accordingly, an object of the present invention is to solve the above-described problems and to provide a forging method for forming a molded article with dog teeth having high strength without causing a lack of thickness at the tip of the dog teeth.
[0008]
[Means for Solving the Problems]
The present invention is as follows.
[0009]
In a forging method for forming a dog-toothed product having a plurality of dog teeth provided on the outer periphery with guide chamfers protruding in a V shape at the end in the axial direction, a preliminary projecting in the axial direction from the adjacent inner peripheral adjacent portion In the dog teeth, on the protruding side of the auxiliary dog teeth, the inclined part is inclined in the radial direction from the inner peripheral adjacent part to the protruding end face of the auxiliary dog teeth, and the axis line is continuously perpendicular to the radial end of the auxiliary dog teeth from the inclined part possess a protruding end extending in a direction, the inclined portion and a projecting end portion, a first step of forming a preliminary dog teeth only axially projecting dog teeth formed end portion protruding spare dog teeth Consists of a second step of pressing and compressing to a position that does not protrude from the inner peripheral adjacent portion to form dog teeth .
[0010]
【Example】
Embodiments of the present invention will be described below with reference to FIGS.
[0011]
FIG. 1D shows a gear 31 having a large-diameter large-diameter portion 6 with a helical tooth 9 for power transmission, and a small-diameter portion 7 smaller in diameter than the large-diameter portion 6 and a spline-like dog tooth 3 for synchronization. In addition, a through hole 2 that penetrates in the axial direction is provided at the center of the gear 31, and a hollow portion 8 that is recessed in a circumferential shape is provided on the end surface of the helical tooth 9.
[0012]
Next, the molding process of the gear 31 will be described sequentially.
[0013]
First, as shown in FIG. 1A, forging is performed on a ring-shaped blank 1 having a volume slightly larger than the volume of a desired gear 31, and a preform is formed as shown in FIG. Article 11 is molded. A molding process for molding the preform 11 will be described with reference to FIGS.
[0014]
In FIG. 3, reference numeral 40 denotes a forging device, which includes a lower die 51 and an upper die 41 arranged on the same axis.
[0015]
The lower die 51 has a mandrel 52 substantially the same as the outer diameter of the blank 1 along its axis, and a die 54 on the outer peripheral side of the mandrel 52 via a knockout ring 53 concentric with the mandrel 52. Is placed. The die 54 is formed with a center hole 59 passing through the center thereof. The center hole 59 is a large-diameter inner hole 59a from the upper end, and a step-shaped first shoulder extending continuously from the large-diameter inner hole 59a toward the center. Portion 58a, intermediate inner hole 59b extending in the axial direction continuously from first shoulder 58a, stepped second shoulder 58b extending from the inner inner hole 59b to the center side, and second shoulder It consists of a small diameter inner hole 59c extending continuously from the portion 58b to the lower end. As shown in FIGS. 4 and 5, a preformed tooth die 55 for molding the preliminary dog teeth 3 a of the preform 11 is provided at equal intervals in the circumferential direction on the inner periphery of the intermediate inner hole 59 b of the center hole 59. A plurality are provided. The bottom portion of the preformed tooth die 55 is formed at a position lower than the second shoulder portion 58b, and has an inclined molding portion 56a inclined toward the second shoulder portion 58b on the inner peripheral side. Further, the bottom of the pre-formed tooth mold 55 has a V-shaped pre-chamber forming part 56 in the circumferential direction. As shown in FIG. 3, the knockout ring 53 disposed between the die 54 and the mandrel 52 is movable in the vertical direction in order to take out the forged preform 11 from the lower mold 51. The die 54, the knockout ring 53, and the mandrel 52 define a die carving space 57 into which the blank material 1 is put.
[0016]
The upper die 41 is provided with a ring-shaped punch 42 facing the die-sculpting space 57 of the lower die 51, and has the same outer shape as that of the hollow portion 8 of the preform 11 at the lower end of the punch 42. A punch hole 44 to be inserted into the mandrel 52 is provided on the pressing protrusion 43 and the inner periphery. In addition, a spacer 46 and a backup ring 47 are disposed on the upper side of the punch 42, and are integrally assembled by a punch guide 45 installed on the outer peripheral side thereof.
[0017]
The process of forming the preform 11 from the blank 1 with the forging device 40 will be described. First, as shown in the left half of FIG. 3, the lower die 51 is defined with the upper die 41 retracted upward. The blank material 1 is put into the mold carving space 57. Subsequently, the upper die 41 is lowered, and the punch 42 presses the blank material 1 from above. Here, the forged meat flowing in the preformed tooth die 55 extends in the axial direction and is filled up to the preformed chamfer molding portion 56 as shown in the right half of FIG. The preform 11 thus molded projects in the axial direction from the inner peripheral adjacent portion 10 to which the preliminary dog teeth 3a are adjacent, and inclines in the radial direction from the inner peripheral adjacent portion 10 to the end surface from which the preliminary dog teeth 3a protrude. An inclined portion 5 is provided. After that, the upper die 41 is retracted upward and the knockout ring 53 is raised, and the preformed product 11 is taken out from the die-sculpting space 57 of the lower die 51 to complete the molding of the preformed product 11.
[0018]
The forging flow of the preform 11 thus formed, particularly in the vicinity of the preliminary dog teeth 3a, extends from the end face of the large-diameter portion 6 in the axial direction as shown in FIG. The chamfer 4a continues to the inner peripheral adjacent portion 10 along the inclined portion 5 in the inner peripheral direction.
[0019]
Then, sizing is performed on the preliminary dog teeth 3a of the preformed product 11 formed as described above, and a molded product 21 with dog teeth having the dog teeth 3 is formed as shown in FIG. A molding process for molding the dog-tooth molded product 21 will be described with reference to FIG.
[0020]
In FIG. 6, reference numeral 70 denotes a sizing device, which comprises a lower die 81 and an upper die 71 arranged on the same axis.
[0021]
The lower die 81 has a knockout pin 82 along its axis, a concentric die 84 on the outer periphery of the knockout pin 82, and a base 90 that supports the die 84 on the lower outer periphery. A die-sculpting space 87 is defined by the inner peripheral upper portion of the die 84 and the upper end portion of the knockout pin 82, and a molded tooth die 85 having substantially the same shape as the desired dog tooth 3 is formed at the inner peripheral upper end of the die 84. A plurality are provided at equal intervals in the circumferential direction. The knockout pin 82 is movable in the vertical direction in order to take out the sizing-processed molded article 21 with dog teeth from the lower mold 81.
[0022]
The upper die 71 is provided with a ring-shaped punch 72 facing the die-sculpting space 87 of the lower die 81, and has the same outer shape as that of the pre-molded product 11 at the lower end of the punch 72. A punch hole 74 to be inserted into the mandrel 82 is provided on the inner surface of the pressing convex portion 73. Further, a spacer 76 and a backup ring 77 are disposed on the upper side of the punch 72, and are integrally assembled by a punch guide 75 installed on the outer peripheral side thereof.
[0023]
The process of molding the dog-toothed molded product 21 from the preformed product 11 with the sizing device 70 will be described. First, as shown in the left half of FIG. 6, the die 84 is molded with the upper die 71 retracted upward. The preform 11 that has been aligned so that the preliminary dog teeth 3a are aligned with the tooth mold 85 is placed. Subsequently, the upper die 71 is lowered, the punch 72 presses the preform 11 from above, and the desired dog tooth 3 is pressed and compressed in the axial direction in accordance with the forming tooth die 85 of the die 84. A molded article 21 with dog teeth is formed. Then, the upper die 71 is retracted upward and the knockout pin 82 is raised, and the molded product 21 with the dog teeth is taken out from the lower die 81, and the molding of the molded product 21 with the dog teeth is completed.
[0024]
In the molded product 21 with dog teeth formed in this way, the forging flow in the vicinity of the preliminary dog teeth 3a before molding shown in FIG. 2A continues to the inner peripheral adjacent portion 10 following the inclined portion 5. Therefore, the compression amount on the inner peripheral adjacent portion 10 side of the preliminary dog teeth 3a to be pressed and compressed is smaller than the compression amount on the outer peripheral side of the preliminary dog teeth 3a, and therefore sizing is performed as shown in FIG. The forging flow in the vicinity of the dog teeth 3 is mostly continuous from the dog teeth 3 to the inner peripheral adjacent portion 10.
[0025]
Finally, helical teeth 9 are formed on the large-diameter portion 6 of the molded product 21 with dog teeth by hobbing, and a gear 31 is formed as shown in FIG.
[0026]
In the above embodiment, the dog teeth 3 and the inner peripheral adjacent portion 10 have the same height, but the dog teeth 3 may be recessed in the axial direction from the inner peripheral adjacent portion 10. When the dog teeth 3 are recessed as described above, the forging flow is slightly cut off on the chamfer 4 side, but the forging flow is not cut off at other portions.
[0027]
Moreover, in the said Example, although the helical tooth 9 was shape | molded by hobbing after sizing the dog tooth 3, the helical tooth 9 may be shape | molded by forging.
[0028]
【The invention's effect】
As described above, according to the present invention, in the method for forging a molded article with a dog tooth provided with a plurality of dog teeth provided on the outer periphery on the outer periphery thereof, a guide chamfer protruding in a V shape at the axial end is provided. A preliminary dog tooth that protrudes in the axial direction from the circumferentially adjacent portion. On the protruding side of the preliminary dog tooth, an inclined portion that inclines in the radial direction from the inner peripheral adjacent portion to the protruding end surface of the preliminary dog tooth; the first step to radial end continuously possess a protruding end extending in the axial vertical direction, the inclined portion and a projecting end portion, to form a pre dog teeth projecting only in the axial direction of the dog teeth formed And the second step of forming the dog teeth by pressing and compressing the protruding end portion of the preliminary dog teeth to the position where it does not protrude from the inner peripheral adjacent portion. The amount of compression is less than the amount of compression on the outer periphery of the spare dog tooth. Forging flow of the molded dog around teeth so largely continuous over the inner peripheral adjacent portion of dog teeth, it is possible to prevent the strength of the dog teeth is reduced off forging flow. Further, since the outer peripheral side of the distal end of the dog tooth is particularly pressed and compressed, it is possible to form a desired dog tooth without a lack of thickness.
[Brief description of the drawings]
FIG. 1 is a cross-sectional plan view illustrating a process of forming a gear according to an embodiment of the present invention.
2A is a cross-sectional view in the vicinity of the preliminary dog teeth formed in the B part of FIG. 1, and FIG. 2A is a cross-sectional view in the vicinity of the dog teeth formed in the C part of FIG. It is.
FIG. 3 is a partial cross-sectional plan view showing a first step of forming a preform from a blank material according to an embodiment of the present invention, wherein the left half is before forming and the right half is after forming.
4 is an enlarged view of a part A in FIG. 3;
FIG. 5 is a perspective view of the vicinity of part A in FIG. 2;
FIG. 6 is a partial cross-sectional plan view showing a second step of molding a dog-tooth molded product from a preformed product according to an embodiment of the present invention, with the left half part before molding and the right half part after molding. is there.
FIG. 7 is a cross-sectional plan view showing a process of forming a conventional gear.
FIG. 8 is a cross-sectional plan view showing another process for forming a conventional gear.
9A is a cross-sectional view in the vicinity of the preliminary dog teeth formed in the D portion of FIG. 8, and FIG. 9B is a cross-sectional view in the vicinity of the dog teeth formed in the E portion of FIG. It is.
[Explanation of symbols]
3 Dog tooth 3a Preliminary dog tooth 4 Chamfer 5 Inclined part 10 Inner peripheral adjacent part

Claims (1)

軸線方向端部にV字状に突出する案内用のチャンファ(4)を備えるドグ歯(3)を、外周に複数設けたドグ歯付き成形品の鍛造成形方法において、隣接する内周隣接部(10)より軸線方向に突出する予備ドグ歯(3a)で、該予備ドグ歯(3a)の突出側に、内周隣接部(10)から予備ドグ歯(3a)の突出する端面まで径方向に傾斜する傾斜部(5)と、該傾斜部(5)から予備ドグ歯(3a)の径方向終端まで連続して軸線垂直方向に延びる突出端部とを有し、前記傾斜部(5)及び前記突出端部が、形成されるドグ歯(3)の軸線方向にのみ突出する予備ドグ歯(3a)を形成する第一工程と、該予備ドグ歯(3a)の突出する端部が内周隣接部(10)から突出しない位置まで押圧圧縮してドグ歯(3)を成形する第二工程とからなることを特徴とするドグ歯付き成形品の鍛造成形方法。In a forging method of a molded product with dog teeth, in which a plurality of dog teeth (3) provided with guide chamfers (4) projecting in a V shape at the end in the axial direction are provided on the outer periphery, adjacent inner peripheral adjacent portions ( 10) With the preliminary dog teeth (3a) protruding in the axial direction from the inner side adjacent portion (10) to the protruding end surface of the preliminary dog teeth (3a) on the protruding side of the preliminary dog teeth (3a) in the radial direction inclined portion inclined with (5), said inclined portion (5) to the radial end of the preliminary dog teeth (3a) possess a protruding end extending into the axial vertical direction continuously, the inclined portion (5) and A first step in which the protruding end portion forms a preliminary dog tooth (3a) protruding only in the axial direction of the dog tooth (3) to be formed, and the protruding end portion of the preliminary dog tooth (3a) is an inner circumference a second step of molding the dog teeth (3) presses compressed to a position that does not protrude from the adjacent portions (10) Forging method of dog teeth with moldings, characterized in that Ranaru.
JP27787899A 1999-09-30 1999-09-30 Forging molding method for molded products with dog teeth Expired - Lifetime JP3784043B2 (en)

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