JP3031850B2 - Method and apparatus for cold forging of bevel gear - Google Patents
Method and apparatus for cold forging of bevel gearInfo
- Publication number
- JP3031850B2 JP3031850B2 JP7327570A JP32757095A JP3031850B2 JP 3031850 B2 JP3031850 B2 JP 3031850B2 JP 7327570 A JP7327570 A JP 7327570A JP 32757095 A JP32757095 A JP 32757095A JP 3031850 B2 JP3031850 B2 JP 3031850B2
- Authority
- JP
- Japan
- Prior art keywords
- die
- punch
- bevel gear
- mold
- forging
- 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.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば、自動車に
使用されるベベルギアの如き傘歯車を、冷間鍛造成形に
より製造する方法およびその装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing bevel gears such as bevel gears used in automobiles by cold forging.
【０００２】[0002]
【従来の技術】従来から、例えば、自動車のディファレ
ンシャル装置に使用されるベベルギアの如き傘歯車を鍛
造成形により製造する方法が提案されている。図１２Ａ
〜図１２Ｆに示す従来技術では、先ず、円柱形の鍛造用
素材１０（図１２Ａ参照）に鍛造成形を施して一次成形
品１２を得る（図１２Ｂ参照）。次に、この一次成形品
１２は加工硬化している場合があるため、約７２０℃で
低温焼鈍を行う。次いで、焼き付けを防止するため、リ
ン酸塩被膜を一次成形品１２の表面に形成することによ
り潤滑処理を施す。このようにして得られた一次成形品
１２を鍛造成形装置に載置する。このとき、傘歯車の歯
形が形成される部位１４が図示しない下型に形成された
歯形に当接する。そして、図示しない上型を下型に向け
て下降させることで二次鍛造成形により傘歯車の歯形が
形成された二次成形品１６を成形する（図１２Ｃ参
照）。2. Description of the Related Art Conventionally, there has been proposed a method of manufacturing a bevel gear such as a bevel gear used for a differential device of an automobile by forging. FIG. 12A
In the prior art shown in FIG. 12 to FIG. 12F, first, forging is performed on a cylindrical forging material 10 (see FIG. 12A) to obtain a primary molded product 12 (see FIG. 12B). Next, since the primary molded product 12 may be work-hardened, low-temperature annealing is performed at about 720 ° C. Next, a lubrication treatment is performed by forming a phosphate film on the surface of the primary molded article 12 in order to prevent burning. The primary molded article 12 thus obtained is placed on a forging apparatus. At this time, the portion 14 where the tooth profile of the bevel gear is formed abuts on the tooth profile formed on the lower mold (not shown). Then, the upper mold (not shown) is lowered toward the lower mold to form the secondary molded product 16 having the bevel gear tooth profile formed by secondary forging (see FIG. 12C).
【０００３】このとき、複雑な形状の歯形を１回の鍛造
で成形すると、前記上型の下降時に金型に大きな負荷が
加わり、下型の歯形が破損したり寿命が低下する懸念が
ある。そこで、歯形を成形するために鍛造工程を２回に
分けて営む必要がある。すなわち、前記と同様に歯形が
形成された二次成形品１６に再び焼鈍、潤滑処理を施し
て三次鍛造成形を行い、完成された歯形形状を有する三
次成形品１８を得る（図１２Ｄ参照）。そして、該三次
成形品１８に形成されたフランジ部２０、バリ部分のト
リミング、孔明け加工を行い（図１２Ｅ参照）、次い
で、機械加工により前記孔明け加工により画成された孔
部２２の内径部の切削や、フランジ面２４の仕上げ作業
を行い、傘歯車２６を製造していた（図１２Ｆ参照）。[0003] At this time, if the tooth profile having a complicated shape is formed by one forging, a large load is applied to the die when the upper die is lowered, and there is a concern that the tooth profile of the lower die is damaged or the life is shortened. Therefore, it is necessary to divide the forging process into two for forming the tooth profile. That is, the secondary molded product 16 having the tooth profile formed thereon is annealed and lubricated again to perform tertiary forging, thereby obtaining a tertiary molded product 18 having a completed tooth profile (see FIG. 12D). Then, trimming and boring of the flange portion 20 and the burr portion formed on the tertiary molded article 18 are performed (see FIG. 12E), and then the inner diameter of the hole 22 defined by the boring by machining. The bevel gear 26 was manufactured by cutting the part and finishing the flange surface 24 (see FIG. 12F).
【０００４】また、特開平７−２３６９３７号公報に開
示されている従来技術に係る鍛造成形装置では、上ポン
チが設けられた上型と、下ポンチが変位自在に設けられ
た下型とを備え、上型の下降作用下にワークの上部を上
ポンチで押圧して一次鍛圧を施し、鍛造用素材を、製造
する傘歯車の少なくとも歯底部分まで流動変位させ、下
ポンチをキャビティに進入させ、ワークを押圧して二次
鍛圧を施し、成形される傘歯車の歯先部分まで素材を流
動変位させて傘歯車を製造する方法が提案されている。A forging apparatus according to the prior art disclosed in Japanese Patent Application Laid-Open No. 7-236937 is provided with an upper die provided with an upper punch and a lower die provided with a lower punch so as to be displaceable. Under the lowering action of the upper mold, the upper part of the work is pressed with an upper punch to apply a primary forging pressure, and the forging material is flow-displaced to at least the bottom of the bevel gear to be manufactured, and the lower punch enters the cavity, There has been proposed a method of manufacturing a bevel gear by pressing a workpiece to apply a secondary forging pressure, and flowing and displacing the material to the tooth tip portion of the bevel gear to be formed.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、前者の
従来技術に係る傘歯車の鍛造成形方法では、鍛造成形工
程が多数必要であり、しかも夫々の鍛造成形工程毎に焼
鈍、潤滑処理が必要で、多くの工数と時間がかかる不都
合が指摘されている。また、鍛造成形工程毎に多くの鍛
造成形装置と焼鈍、潤滑処理を施す装置が必要となり、
装置のコストが高騰し、従って、製品価格も高騰せざる
を得ない。また、装置の設置場所も広い面積を必要とす
る。However, in the former method of forging a bevel gear according to the prior art, a large number of forging steps are required, and furthermore, annealing and lubrication are required for each forging step. It has been pointed out that many man-hours and time are required. In addition, many forging devices and devices that perform annealing and lubrication are required for each forging process,
The cost of the equipment has risen and the price of the product has to rise. In addition, the installation place of the device requires a large area.
【０００６】このように多数の鍛造成形装置を採用する
ことなく、１つの鍛造成形装置で傘歯車を製造するに
は、先ず、一次鍛造成形により一次成形品１２を多数成
形して蓄えておき、次に金型を交換して前記一次成形品
１２に二次鍛造成形を施して歯形が形成された二次成形
品１６を成形して蓄え、再び金型を交換して三次鍛造成
形を実施しなければならない。このため、工程毎に金型
の交換が必要となり、煩雑であり、また、一次成形品１
２、二次成形品１６を夫々蓄えておくスペースが必要と
なる等の問題が惹起し、大量生産に対しては極めて非効
率的であり、生産性に劣り、自動化も困難であった。In order to manufacture a bevel gear with one forging apparatus without employing many forging apparatuses as described above, first, a large number of primary molded articles 12 are formed by primary forging and stored. Next, the mold is exchanged, and the primary molded article 12 is subjected to secondary forging to form and store the secondary molded article 16 in which the tooth profile is formed, and the mold is exchanged again to perform tertiary forging. There must be. For this reason, it is necessary to replace the mold for each process, which is troublesome.
2. A problem such as the necessity of a space for storing each of the secondary molded products 16 is caused, which is extremely inefficient for mass production, is inferior in productivity, and is difficult to automate.
【０００７】一方、後者の従来技術に係る傘歯車の鍛造
成形方法では、上型が下型に圧接する際に上型に形成さ
れた歯形がワークの上部、すなわち歯形が形成される部
位を押圧して変形させる。このため、上型の歯形に強い
力が加わり、該歯形が損傷する懸念があり、上型の耐久
性が短くなるという問題があった。On the other hand, in the latter method of forging a bevel gear according to the prior art, when the upper die presses against the lower die, the tooth shape formed on the upper die presses the upper part of the work, that is, the portion where the tooth shape is formed. And deform. For this reason, a strong force is applied to the tooth shape of the upper die, and there is a concern that the tooth shape may be damaged, and there is a problem that the durability of the upper die is shortened.
【０００８】本発明は前記の種々の不都合を克服するた
めになされたものであり、鍛造成形工程を少なくするこ
とが可能で、中間焼鈍、潤滑処理を施す装置を省略し、
成形品を蓄える場所が不要となり、このため、生産効率
を向上させ、製造コストを低廉化することができ、さら
にまた、金型の歯形が損傷する懸念を払拭した傘歯車の
鍛造成形方法およびその装置を提供することを目的とす
る。The present invention has been made to overcome the above-mentioned various disadvantages, and can reduce the number of forging steps, omit an apparatus for performing intermediate annealing and lubrication processing,
There is no need for a place to store the molded product, thereby improving the production efficiency and reducing the manufacturing cost, and furthermore, the forging method of the bevel gear that eliminates the fear of damaging the tooth profile of the mold and its method. It is intended to provide a device.
【０００９】[0009]
【課題を解決するための手段】前記の目的を達成するた
めに、本発明は、傘歯車を冷間鍛造成形により成形する
ための方法において、ワークに鍛造成形を施すことによ
り傘歯車の原形形状に成形された一次成形品を得る工程
と、前記一次成形品に潤滑処理を施す工程と、前記潤滑
処理が施された一次成形品を、加工される傘歯車の歯形
が形成される部位を上方に向けて下型に載置する工程
と、上型に形成された歯形を前記一次成形品から離間し
た状態で当該上型と前記下型とを当接閉塞させる工程
と、下ポンチまたは上ポンチの少なくともいずれか一方
をキャビティに進入させて前記一次成形品を押圧し、前
記キャビティを画成する下型と上型の壁部に前記一次成
形品をすえ込み、鍛造成形を施して二次成形品を得る工
程と、前記二次成形品を孔明けダイに載置する工程と、
前記孔明けダイに対して孔明けポンチを変位させて前記
二次成形品に孔明け加工を施し、完成した傘歯車を得る
工程と、を有し、前記一次成形品を得る工程と、前記二
次成形品を得る工程と、前記孔明け加工を施す工程とを
同時に行い、夫々加工が施されたワークを同時に次の工
程に搬送することを特徴とする。In order to achieve the above object, the present invention relates to a method for forming a bevel gear by cold forging, comprising the steps of: obtaining a primary molded article molded, a step of applying a lubricating treatment before Symbol primary molded product, the pre-primary molded article KiJun sliding process has been performed, the tooth profile of the bevel gear to be machined is formed a step of mounting the lower die toward a site upward, a step of contact closed in a state in which a tooth profile formed in the upper mold is spaced from the primary molded product and the upper mold and the lower mold, the lower punch Or at least one of the upper punches
It was allowed to enter the key Yabiti presses the primary molded article, before
A step of swaging the primary molded product on the walls of the lower die and the upper die defining the cavity and performing forging to obtain a secondary molded product; and placing the secondary molded product on a punching die. Process and
The drilling punch is displaced relative to the drilling die subjected to drilling to the secondary molded product, comprising the steps of possess obtaining a finished bevel gears, to give the primary molded product, the two
A step of obtaining a next molded article, and a step of performing the drilling process.
Work is performed at the same time, and the
It is characterized by being transported in a short time .
【００１０】本発明によれば、先ず、ワークに鍛造成形
が施され、傘歯車の原形形状の一次成形品を得る。次
に、鍛造成形の際に一次成形品が金型に張り付くことを
防止するため、潤滑処理を行う。次いで、下型に一次成
形品を歯形が形成される部位が上方に向くように載置す
る。この一次成形品に向けて上型を下降させ、下型と上
型を互いに閉塞させれば、前記一次成形品の上部は上型
から離間しているため、上型に形成された歯形には上型
と下型との当接時の衝撃が加わることがない。そして、
下ポンチまたは上ポンチの少なくとも一方をキャビティ
に進入させると、前記キャビティの内部の一次成形品は
押圧されて塑性変形し、前記上型の歯形に隙間なく流動
し、二次成形品が得られる。この二次成形品に孔明け加
工を施して傘歯車が完成する。[0010] According to the present invention, first, the work is forged, to obtain a primary molded product of the original shape of the bevel gear. Next, in order to prevent the primary molded article sticks to the mold during forging reclamation shaped to lubricate process. Then, a portion of teeth form a primary molded article in the lower mold is formed is placed so as to face upward. If the upper mold is lowered toward this primary molded article and the lower mold and the upper mold are closed to each other, the upper part of the primary molded article is separated from the upper mold, so that the tooth shape formed on the upper mold has No impact is applied when the upper and lower dies abut. And
When advancing the at least one bottom punch or the upper punch in key Yabiti primary moldings within said cavity is pressed and plastically deformed, without clearance flow, the secondary molded article is obtained the tooth profile of the upper die . Drilling is performed on this secondary molded product to complete a bevel gear.
【００１１】また、本発明は、傘歯車を冷間鍛造成形に
より成形するための方法において、傘歯車の原形形状に
成形され中間焼鈍および潤滑処理が施された一次成形品
を、加工される傘歯車の歯形が形成される部位を上方に
向けて下型に載置する工程と、上型に形成された歯形を
前記一次成形品から離間した状態で当該上型と前記下型
とを当接閉塞させる工程と、下ポンチまたは上ポンチの
少なくともいずれか一方をキャビティに進入させて前記
一次成形品を押圧し、前記キャビティを画成する下型と
上型の壁部に前記一次成形品をすえ込み、鍛造成形を施
して二次成形品を得る工程と、前記二次成形品を孔明け
ダイに載置する工程と、前記孔明けダイに対して孔明け
ポンチを変位させて前記二次成形品に孔明け加工を施
し、完成した傘歯車を得る工程と、を有し、前記二次成
形品を得る工程と、前記孔明け加工を施す工程とを同時
に行い、夫々加工が施されたワークを同時に次の工程に
搬送することを特徴とする。Further, the present invention is a bevel gear in a method for forming by cold forging, the original shape of the bevel gear
Placing the formed primary molded article subjected to intermediate annealing and lubrication processing on the lower mold with the part where the tooth profile of the bevel gear to be processed is formed facing upward ; and forming the tooth profile formed on the upper mold. The upper mold and the lower mold in a state separated from the primary molded product
A step of Ru abut closed the door, at least one of the lower punch or the upper punch by entering the key Yabiti presses the primary molded article, the wall of the lower mold and the upper mold defining said cavity displacement said upsetting the primary molded product, and obtaining a secondary molded article is subjected to forging, a step for placing said secondary molded article to punching die, a punching punch to the punch die It is not subjected to drilling to the secondary molded product having a step of obtaining the finished bevel gear, wherein the secondary forming
The step of obtaining a shaped article and the step of performing the drilling simultaneously
And the processed workpieces are simultaneously processed for the next process.
It is characterized by being transported .
【００１２】本発明によれば、先ず、傘歯車の原形形状
に形成され中間焼鈍および潤滑処理が施された一次成形
品を、下型に歯形が形成される部位が上方に向くように
載置する。この一次成形品に向けて上型を下降させ、下
型と上型を互いに閉塞させれば、前記一次成形品の上部
は上型から離間しているため、上型に形成された歯形に
は上型と下型との当接時の衝撃が加わることがない。そ
して、下ポンチまたは上ポンチの少なくとも一方をキャ
ビティに進入させると、前記キャビティの内部の一次成
形品は押圧されて塑性変形し、前記上型の歯形に隙間な
く流動し、二次成形品が得られる。この二次成形品に孔
明け加工を施して傘歯車が完成する。 According to the present invention, first, the original shape of the bevel gear
Primary forming with intermediate annealing and lubrication treatment
Product so that the part where the tooth form is formed on the lower mold faces upward
Place. Lower the upper die toward this primary molded product,
If the mold and the upper mold are closed to each other, the upper part of the primary molded product
Is separated from the upper die, so the tooth shape formed on the upper die
No impact is applied when the upper and lower dies abut. So
The lower punch or the upper punch
When entering the cavity, the primary components inside the cavity are
The molded product is pressed and plastically deformed, and there is no gap in the tooth shape of the upper die.
It flows well and a secondary molded product is obtained. Holes in this secondary molded product
Drilling is performed to complete the bevel gear.
【００１３】[0013]
【００１４】さらに、本発明は、傘歯車を冷間鍛造成形
により成形するための装置において、ワークを傘歯車の
原形形状に鍛造成形して一次成形品を得るための第１下
型および第１上型と、 前記一次成形品の歯形面のない下
面側の雄雌形状に対応した雌雄形状の載置部を有する第
２下型と、 完成した傘歯車の歯形の雄雌形状に対応する
雌雄形状の歯形が形成され、前記第２下型に対して接近
離間自在な第２上型と、前記第２下型に画成された孔部
内に設けられ、該第２下型に対して相対的に変位自在な
下ポンチと、前記第２下型に隣接する孔明けダイと、前
記第１上型、第２上型と一体的に構成され、前記孔明け
ダイに対して接近離間自在な孔明けポンチと、ワークを
前記第１下型から第２下型に、前記第２下型から孔明け
ダイに、前記孔明けダイから次の工程へと順次搬送する
搬送手段と、を備え、前記第２下型と第２上型とを閉塞
したときに、該第２上型に形成された歯形は前記第２下
型に載置された一次成形品と離間し、前記第１上型、第
２上型と孔明けポンチは一体的に変位して夫々前記第１
下型、第２下型、孔明けダイに載置されたワークに鍛造
成形、孔明け加工を同時に行い、夫々加工が施されたワ
ークを同時に次の工程に搬送することを特徴とする。Further, the present invention provides an apparatus for forming a bevel gear by cold forging, wherein the work is formed by the bevel gear.
The first lower part for forging to the original shape to obtain the primary molded product
A mold and a first upper mold, and a lower part without a tooth profile of the primary molded product.
A male and female mounting part corresponding to the male and female shapes on the front side
2 Corresponds to the lower mold and the male and female tooth profiles of the completed bevel gear
Male and female tooth profile shape is formed, and a second upper die can freely toward and away from the second lower die, the image made a hole in the second lower die
And is relatively displaceable with respect to the second lower mold.
A lower punch, a punching die adjacent to the second lower die, and a punching punch that is integrally formed with the first upper die and the second upper die and that can be freely moved toward and away from the punching die; Work
Transport means for sequentially transporting from the first lower mold to the second lower mold, from the second lower mold to the punching die, to the next step from the punching die, and 2 Close the upper mold
The tooth profile formed on the second upper mold is
The first upper mold and the first upper mold are separated from the primary molded product placed on the mold.
2 upper die and the punching punch are integrally displaced respectively the first
Lower mold, a second lower mold, forging the workpiece placed on the punching die, it has simultaneously rows drilling, Wa that each processing is performed
And transporting the workpiece to the next step at the same time .
【００１５】本発明によれば、第１下型にはワークが載
置され、第２下型には第１下型と第１上型とによりワー
クに鍛造成形を施して傘歯車の原形形状に成形された一
次成形品が載置され、孔明けダイには第２下型と第２上
型とで一次成形品が鍛造成形されて得られた二次成形品
が載置され、第１上型、第２上型、孔明けポンチの下降
作用下に夫々鍛造成形、孔明け加工が施されて一次成形
品、二次成形品、傘歯車が成形される。そして、傘歯車
は孔明けダイから次の工程に搬送され、二次成形品は第
２下型から孔明けダイに搬送され、一次成形品は第１下
型から第２下型に搬送される。以上の工程が繰り返され
ることにより、ワークから連続的に傘歯車が成形され
る。According to the present invention, the work is placed on the first lower die.
Is location, the second lower die is placed first lower mold and the primary molded article molded by facilities for forging the word <br/> click the original shape of the bevel gear by a first upper die, The secondary molded product obtained by forging the primary molded product with the second lower die and the second upper die is placed on the punching die, and the first upper die, the second upper die, and the punch for punching are formed. Forging and drilling are performed under descending action, respectively, and primary forming is performed.
Products, secondary molded products and bevel gears are formed. The bevel gear is conveyed from the drilling die in the next step, the secondary molded article first
2 Conveyed from the lower die to the punching die, the primary molded product is the first lower die
It is transported from the mold to the second lower mold. By repeating the above steps, bevel gears are continuously formed from the work.
【００１６】[0016]
【００１７】[0017]
【発明の実施の形態】本発明に係る傘歯車の冷間鍛造成
形方法について、それを実施する装置との関係において
好適な実施の形態を挙げ、添付の図面を参照しながら以
下詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a cold forging method of a bevel gear according to the present invention will be described in detail with reference to the accompanying drawings. .
【００１８】本実施の形態では、自動車に使用される傘
歯車を製造する場合を例に挙げて説明する。In this embodiment, a case where a bevel gear used for an automobile is manufactured will be described as an example.
【００１９】図１において、参照符号３０は、本実施の
形態に係る傘歯車の冷間鍛造成形装置を示す。この傘歯
車の冷間鍛造成形装置３０は下型取付部材３２を含み、
該下型取付部材３２には台座３４が固着される。この台
座３４の中央部には段差を有する孔部３６が画成され、
該孔部３６には油圧ユニット３８が設けられる。該油圧
ユニット３８の内部に画成された室４０には図示しない
圧油供給源から圧油が供給される。前記室４０には押圧
部材４２が上下動自在に設けられ、該押圧部材４２は前
記圧油によって上方に押圧される。In FIG. 1, reference numeral 30 denotes a bevel gear cold forging apparatus according to the present embodiment. This bevel gear cold forging apparatus 30 includes a lower mold mounting member 32,
A pedestal 34 is fixed to the lower mold mounting member 32. A hole 36 having a step is defined in the center of the pedestal 34,
A hydraulic unit 38 is provided in the hole 36. Pressure oil is supplied from a pressure oil supply source (not shown) to a chamber 40 defined inside the hydraulic unit 38. A pressing member 42 is provided in the chamber 40 so as to be vertically movable, and the pressing member 42 is pressed upward by the pressure oil.
【００２０】前記油圧ユニット３８の上部には押さえ部
材４４が固着され、該押さえ部材４４は段部４６を経て
下方に向かって縮径して前記室４０に嵌入している。従
って、前記押圧部材４２は前記押さえ部材４４によって
上方への移動が抑制されている。なお、前記押圧部材４
２の壁部には環状凹部４８が画成され、該環状凹部４８
にはＯリング５０が設けられて前記室４０の内部の圧油
が漏洩することを阻止している。前記押さえ部材４４の
中央部分に画成された大径な孔部５２には台座５４が挿
入され、該台座５４の底部は前記押圧部材４２に固着さ
れる。A pressing member 44 is fixed to the upper part of the hydraulic unit 38, and the pressing member 44 is fitted into the chamber 40 with a diameter reduced downward through a step 46. Therefore, the upward movement of the pressing member 42 is suppressed by the pressing member 44. The pressing member 4
An annular recess 48 is defined in the wall of the second
Is provided with an O-ring 50 to prevent pressure oil inside the chamber 40 from leaking. A pedestal 54 is inserted into the large-diameter hole 52 defined at the center of the pressing member 44, and the bottom of the pedestal 54 is fixed to the pressing member 42.
【００２１】前記油圧ユニット３８の中央部には筒状部
材５６が立設され、該筒状部材５６の上部は前記押圧部
材４２に画成された孔部５７を貫通し、その先端部は前
記台座５４の中央部に画成された孔部５８に嵌入してい
る。前記筒状部材５６の軸線に沿って延在する中央孔部
６０にはピン部材６１が挿入され、該ピン部材６１の上
部は前記筒状部材５６の上端部から上方に突出してい
る。該ピン部材６１は前記孔部５８の上部に画成された
孔部６２に相対的に摺動自在に嵌入する。前記ピン部材
６１の上端部には該ピン部材６１と同径の円筒部材６３
が設けられ、該円筒部材６３の外周には溝部６４が画成
され、該溝部６４にはＯリング６５が設けられている。
前記円筒部材６３にはその軸線方向に沿って孔部６６が
画成され、該孔部６６の一部には上方に向かって縮径す
る傾斜部６７が形成されている。当該孔部６６には前記
ピン部材６１に当接して下ポンチ６８が挿通される。該
下ポンチ６８はテーパ部６９を介して上方に向かって縮
径し、該テーパ部６９は前記傾斜部６７に係合する。ま
た、前記下ポンチ６８の先端部７０は上方に向かってテ
ーパ形状となっている。A tubular member 56 is erected at the center of the hydraulic unit 38, and an upper portion of the tubular member 56 passes through a hole 57 defined in the pressing member 42, and a tip end thereof is formed as described above. The pedestal 54 is fitted into a hole 58 defined at the center. A pin member 61 is inserted into a central hole 60 extending along the axis of the tubular member 56, and an upper portion of the pin member 61 protrudes upward from an upper end of the tubular member 56. The pin member 61 is relatively slidably fitted into a hole 62 defined above the hole 58. A cylindrical member 63 having the same diameter as the pin member 61 is provided at the upper end of the pin member 61.
A groove 64 is defined on the outer periphery of the cylindrical member 63, and an O-ring 65 is provided in the groove 64.
A hole 66 is defined in the cylindrical member 63 along the axial direction, and a part of the hole 66 is formed with an inclined portion 67 whose diameter is reduced upward. The lower punch 68 is inserted into the hole 66 in contact with the pin member 61. The diameter of the lower punch 68 is reduced upward through a tapered portion 69, and the tapered portion 69 is engaged with the inclined portion 67. The tip 70 of the lower punch 68 is tapered upward.
【００２２】前記台座３４の上部に第１のホルダ７２が
立設される。該第１ホルダ７２の上端部には凹部７４が
画成され、該凹部７４には第１下型７６の突部７８が嵌
合する。該第１下型７６の上部中央には載置部８０が形
成されている。該載置部８０は、完成した傘歯車の歯形
面の形成されていない側、すなわち、下面側の雄雌形状
に対応した雌雄形状を有する。A first holder 72 is provided upright on the pedestal 34. A recess 74 is defined at the upper end of the first holder 72, and a projection 78 of a first lower mold 76 fits into the recess 74. A mounting portion 80 is formed at the upper center of the first lower mold 76. The mounting portion 80 has a male and female shape corresponding to the male and female shapes on the side of the completed bevel gear on which the tooth profile surface is not formed, that is, on the lower surface side.
【００２３】また、前記台座３４の上部には第２のホル
ダ８２が立設され、該第２ホルダ８２の上部には凹部８
４が画成される。該凹部８４の底部は前記第２ホルダ８
２の内部で湾曲し該第２ホルダ８２の外側に開口してい
る孔部８６と連通している。前記凹部８４には孔明けダ
イ８８が嵌入され、該孔明けダイ８８の外周には段部９
０が形成され、該段部９０に押さえ部材９２が係合し、
該押さえ部材９２が前記第２ホルダ８２に固着される。
従って、孔明けダイ８８は第２ホルダ８２に保持されて
いることが容易に諒解されよう。前記孔明けダイ８８の
上部中央に、完成した傘歯車の歯形面のない下面側の雄
雌形状に対応した雌雄形状を有する凹部９４が画成され
ているとともに、該凹部９４の中央部には孔部９６が画
成され、該孔部９６は前記孔部８６と連通している。A second holder 82 is provided upright on the pedestal 34, and a recess 8 is provided on the second holder 82.
4 is defined. The bottom of the concave portion 84 is the second holder 8
2 and communicates with a hole 86 which is curved and opened to the outside of the second holder 82. A perforation die 88 is fitted in the concave portion 84, and a step 9 is provided around the perimeter of the perforation die 88.
0 is formed, and the pressing member 92 is engaged with the step portion 90,
The holding member 92 is fixed to the second holder 82.
Therefore, it will be easily understood that the punching die 88 is held by the second holder 82. In the upper center of the punching die 88, a concave portion 94 having a male and female shape corresponding to the male and female shape on the lower surface side without the toothed surface of the completed bevel gear is defined, and at the center of the concave portion 94 A hole 96 is defined, which communicates with the hole 86.
【００２４】前記第１ホルダ７２、第２ホルダ８２を囲
繞して上下方向に摺動自在な中間プレート１００が設け
られ、該中間プレート１００は図示しない緩衝手段、例
えば、コイルばねによって前記台座３４の上端部から所
定距離離間して支持される。前記中間プレート１００の
中央には段差のある大孔１０２が画成され、この大孔１
０２に嵌合するポンチホルダ１０４は前記中間プレート
１００に嵌合する保持板１０６によって保持されてい
る。該ポンチホルダ１０４の中央部には上部がテーパ状
に縮径する孔部１０８が画成され、前記下ポンチ６８が
摺動自在に挿通している。A vertically slidable intermediate plate 100 is provided surrounding the first holder 72 and the second holder 82, and the intermediate plate 100 is mounted on the pedestal 34 by buffer means (not shown), for example, a coil spring. It is supported at a predetermined distance from the upper end. At the center of the intermediate plate 100, a large hole 102 having a step is defined.
02 is held by a holding plate 106 fitted to the intermediate plate 100. At the center of the punch holder 104, a hole 108 whose upper part is tapered is defined, and the lower punch 68 is slidably inserted therethrough.
【００２５】第２下型１１０は、前記ポンチホルダ１０
４に積層されるように前記中間プレート１００に固着さ
れる。実際、第２下型１１０の周囲には段部１１２が形
成され、該段部１１２には押さえ部材１１４が係合し、
該押さえ部材１１４が前記中間プレート１００の上部に
固着されることにより、第２下型１１０は前記中間プレ
ート１００に位置決め固定されている。該第２下型１１
０の中央部には前記孔部１０８と同軸的に連通する孔部
１１６が画成され、該孔部１１６には前記下ポンチ６８
が摺動自在に挿入される。前記第２下型１１０の押さえ
部材１１４から突出する外周縁上面には、上方に向けて
僅かに縮径したテーパ形状の段部１１８が設けられる。
前記第２下型１１０の中央部分に、完成した傘歯車の歯
形面のない下面側の雄雌形状に対応した雌雄形状を有す
る載置部１２０が形成され、該載置部１２０は下方に向
けて縮径して前記孔部１１６と連通する。The second lower mold 110 is provided with the punch holder 10
4 is fixed to the intermediate plate 100 so as to be stacked. Actually, a step 112 is formed around the second lower mold 110, and a pressing member 114 is engaged with the step 112,
The second lower mold 110 is positioned and fixed to the intermediate plate 100 by fixing the pressing member 114 to the upper portion of the intermediate plate 100. The second lower mold 11
0, a hole 116 is formed at the center of the lower punch 68 so as to communicate coaxially with the hole 108.
Are slidably inserted. On the upper surface of the outer peripheral edge protruding from the pressing member 114 of the second lower die 110, a tapered step 118 whose diameter is slightly reduced upward is provided.
A mounting portion 120 having a male and female shape corresponding to the male and female shapes on the lower surface side without the toothed surface of the completed bevel gear is formed at the center portion of the second lower mold 110, and the mounting portion 120 faces downward. The diameter is reduced to communicate with the hole 116.
【００２６】この冷間鍛造成形装置３０は、前記下型取
付部材３２に対して接近離間自在な上型取付部材１３０
を備える。該上型取付部材１３０の中央部には孔部１３
２が画成され、該孔部１３２にはピン部材１３４が摺動
自在に挿通され、且つ当該ピン部材１３４は図示しない
駆動装置によって上下方向に変位可能に構成される。前
記上型取付部材１３０の下部には台座１３６が固着され
る。該台座１３６には前記第１下型７６、孔明けダイ８
８、第２下型１１０の上方に夫々第１〜第３の孔部１３
８、１４０、１４２が画成される。The cold forging apparatus 30 includes an upper die mounting member 130 which can be freely moved toward and away from the lower die mounting member 32.
Is provided. A hole 13 is formed at the center of the upper mold mounting member 130.
2, a pin member 134 is slidably inserted into the hole 132, and the pin member 134 is configured to be vertically displaceable by a driving device (not shown). A pedestal 136 is fixed to a lower portion of the upper die mounting member 130. The pedestal 136 has the first lower mold 76, the punching die 8
8, the first to third holes 13 above the second lower mold 110, respectively.
8, 140, 142 are defined.
【００２７】前記第１孔部１３８には筒状部材１４４が
挿入され、該筒状部材１４４の孔部１４６にはエジェク
タピン１４７が摺動自在に挿入される。該孔部１４６の
下方の内径は縮径し、一方、前記エジェクタピン１４７
の上端部はテーパ状に拡径しているため、該エジェクタ
ピン１４７が孔部１４６から抜け落ちることはない。前
記エジェクタピン１４７にはその内部に軸線方向に沿っ
て孔部１４８が画成され、該孔部１４８にはコイルばね
１４９が挿入される。該コイルばね１４９の上端部は前
記上型取付部材１３０から離間している。A cylindrical member 144 is inserted into the first hole 138, and an ejector pin 147 is slidably inserted into the hole 146 of the cylindrical member 144. The inner diameter below the hole 146 is reduced while the ejector pin 147 is
Since the upper end portion has a tapered diameter, the ejector pin 147 does not fall out of the hole 146. A hole 148 is defined in the ejector pin 147 along the axial direction, and a coil spring 149 is inserted into the hole 148. The upper end of the coil spring 149 is separated from the upper die mounting member 130.
【００２８】前記エジェクタピン１４７の下部は縮径し
て先端部１５０が形成されている。前記筒状部材１４４
の下部には前記エジェクタピン１４７を囲繞してピンホ
ルダ１５１が固着され、該ピンホルダ１５１の下部には
凹部１５２が画成され、該凹部１５２には第１上型１５
３が嵌入される。前記第１上型１５３の上端部は半径方
向外方に突出するフランジ部１５３ａが形成され、一
方、前記ピンホルダ１５１の下部には半径方向内方に突
出するフランジ部１５１ａが形成されることにより、前
記第１上型１５３は前記ピンホルダ１５１に抜け止めさ
れて固着する。前記第１上型１５３の下部には上方に向
かって縮径する凹部１５４が画成される。該凹部１５４
の中央部には孔部１５５が画成され、該孔部１５５には
前記エジェクタピン１４７の先端部１５０が摺動自在に
挿通する。The lower part of the ejector pin 147 is reduced in diameter to form a tip 150. The tubular member 144
A pin holder 151 is fixed to a lower portion of the pin holder so as to surround the ejector pin 147, and a concave portion 152 is defined in a lower portion of the pin holder 151.
3 is inserted. An upper end portion of the first upper die 153 is formed with a flange portion 153a projecting radially outward, while a lower portion of the pin holder 151 is formed with a flange portion 151a projecting radially inward. The first upper die 153 is secured to the pin holder 151 by being prevented from falling off. In the lower part of the first upper die 153, a concave portion 154 is formed, whose diameter is reduced upward. The recess 154
A hole 155 is defined at the center of the hole 155, and the tip 150 of the ejector pin 147 is slidably inserted into the hole 155.
【００２９】前記第２孔部１４０には、図４に示すよう
に、前記上型取付部材１３０に当接して支持部材１５６
が挿入される。該支持部材１５６の下部は段部１５７を
経て縮径し、該段部１５７には前記第２孔部１４０に嵌
入される押さえ部材１５８が係合する。該押さえ部材１
５８の下部にはフランジ部１６０が形成され、該フラン
ジ部１６０は前記台座１３６にねじ１６２で固着される
ことにより、前記支持部材１５６は抜け止めされる。前
記支持部材１５６の下部には孔明けポンチ１６４が固着
され、該孔明けポンチ１６４は前記押さえ部材１５８に
画成された孔部１６６を貫通している。As shown in FIG. 4, the support member 156 is brought into contact with the upper die mounting member 130 in the second hole portion 140.
Is inserted. The lower portion of the support member 156 is reduced in diameter through a step 157, and a pressing member 158 fitted into the second hole 140 is engaged with the step 157. The holding member 1
A flange portion 160 is formed at a lower portion of the 58, and the flange portion 160 is fixed to the pedestal 136 with a screw 162, so that the support member 156 is prevented from coming off. A punch 164 is fixed to a lower portion of the support member 156, and the punch 164 passes through a hole 166 defined in the holding member 158.
【００３０】前記上型取付部材１３０には雌ねじが螺刻
された孔部１６８ａ、１６８ｂが画成され、該孔部１６
８ａ、１６８ｂは段部１６９ａ、１６９ｂを介して下方
に拡径し、さらに段部１７０ａ、１７０ｂを経て大径な
孔部１７２ａ、１７２ｂが画成されている。該段部１６
９ａ、１６９ｂには筒状部材１７４ａ、１７４ｂが下方
に延在して固着される。該筒状部材１７４ａ、１７４ｂ
の下端部には円盤状の板状部材１７８ａ、１７８ｂがね
じ１７６ａ、１７６ｂによって締結され、該板状部材１
７８ａ、１７８ｂは筒状部材１７４ａ、１７４ｂの外壁
から半径方向外方に突出している。前記孔部１７２ａ、
１７２ｂには前記筒状部材１７４ａ、１７４ｂを囲繞し
てコイルばね１８０ａ、１８０ｂが設けられ、該コイル
ばね１８０ａ、１８０ｂの一端部は前記段部１７０ａ、
１７０ｂに当接している。The upper die mounting member 130 is formed with holes 168a and 168b in which female threads are threaded.
8a and 168b are enlarged downwardly through steps 169a and 169b, and large holes 172a and 172b are defined through the steps 170a and 170b. The step 16
Cylindrical members 174a and 174b extend downward and are fixed to 9a and 169b. The cylindrical members 174a, 174b
Disc-shaped plate-like members 178a and 178b are fastened to the lower ends of the plate-like members by screws 176a and 176b.
Reference numerals 78a and 178b protrude radially outward from the outer walls of the cylindrical members 174a and 174b. The hole 172a,
172b is provided with coil springs 180a, 180b surrounding the cylindrical members 174a, 174b, and one end of the coil springs 180a, 180b is provided with the stepped portions 170a,
170b.
【００３１】前記台座１３６には前記孔部１７２ａ、１
７２ｂに連通する孔部１８２ａ、１８２ｂが画成され、
該孔部１８２ａ、１８２ｂには前記コイルばね１８０
ａ、１８０ｂが挿入される。The pedestal 136 has the holes 172a, 1
Holes 182a, 182b communicating with 72b are defined,
The holes 182a and 182b are provided with the coil spring 180.
a and 180b are inserted.
【００３２】前記台座１３６の下方には前記コイルばね
１８０ａ、１８０ｂの他端部に当接して保持プレート１
８４が設けられ、該保持プレート１８４には孔部１８６
ａ、１８６ｂが画成され、該孔部１８６ａ、１８６ｂに
は前記筒状部材１７４ａ、１７４ｂが摺動自在に挿入さ
れる。前記孔部１８６ａ、１８６ｂは段部１８８ａ、１
８８ｂを経て拡径し、該段部１８８ａ、１８８ｂに前記
板状部材１７８ａ、１７８ｂの周縁部分が係合して前記
保持プレート１８４は下方への移動が阻止される。従っ
て、前記コイルばね１８０ａ、１８０ｂは前記上型取付
部材１３０と前記保持プレート１８４とを互いに離間す
る方向に付勢していることが容易に諒解されよう。Below the pedestal 136, the holding plate 1 is brought into contact with the other end of the coil springs 180a and 180b.
84 are provided, and the holding plate 184 has a hole 186 therein.
a, 186b are defined, and the cylindrical members 174a, 174b are slidably inserted into the holes 186a, 186b. The holes 186a and 186b are provided with step portions 188a and 1
The diameter increases through step 88b, and the peripheral portions of the plate members 178a and 178b engage with the steps 188a and 188b, so that the holding plate 184 is prevented from moving downward. Therefore, it can be easily understood that the coil springs 180a and 180b urge the upper mold mounting member 130 and the holding plate 184 in a direction of separating from each other.
【００３３】前記保持プレート１８４の中央部には孔部
１９０が画成され、前記孔部１９０は段部１９２を経て
下方が拡径している。該孔部１９０にはストリッパ１９
４が挿入される。該ストリッパ１９４の外周にはフラン
ジ部１９６が形成され、該フランジ部１９６は前記段部
１９２に嵌合し、ねじ１９８で締結されることにより、
前記ストリッパ１９４は前記保持プレート１８４に固着
される。前記ストリッパ１９４の下部には一次成形品の
上部に係合する凹部２００が画成される。該凹部２００
の中央部には孔部２０２が画成され、該孔部２０２には
前記孔明けポンチ１６４が摺動自在に挿通する。A hole 190 is defined at the center of the holding plate 184, and the hole 190 has a stepped portion 192, and its diameter is increased downward. The hole 190 has the stripper 19
4 is inserted. A flange portion 196 is formed on the outer periphery of the stripper 194. The flange portion 196 is fitted to the step portion 192 and fastened with a screw 198.
The stripper 194 is fixed to the holding plate 184. The lower part of the stripper 194 defines a concave part 200 which engages with the upper part of the primary molded product. The recess 200
A hole 202 is defined at the center of the hole 202. The hole punch 164 is slidably inserted through the hole 202.
【００３４】前記第３孔部１４２には、図１に示すよう
に、ポンチホルダ２０４が前記上型取付部材１３０に当
接して挿入される。該ポンチホルダ２０４の下部外縁部
には上型ホルダ２０６が係合し、該上型ホルダ２０６が
前記台座１３６に固着されることによって前記ポンチホ
ルダ２０４は抜け止めされる。前記ポンチホルダ２０４
の内部には孔部２０８が画成され、該孔部２０８には上
ポンチ２１０が摺動自在に挿入され、該上ポンチ２１０
の上端部には前記ピン部材１３４が当接する。当該上ポ
ンチ２１０には下方に縮径するテーパ部２１２を介して
小径部２１４が形成される。As shown in FIG. 1, a punch holder 204 is inserted into the third hole 142 in contact with the upper die mounting member 130. An upper die holder 206 is engaged with a lower outer edge portion of the punch holder 204, and the punch holder 204 is prevented from coming off by fixing the upper die holder 206 to the pedestal 136. The punch holder 204
The upper punch 210 is slidably inserted into the hole 208, and the upper punch 210 is slidably inserted into the hole 208.
The pin member 134 is in contact with the upper end of the. A small diameter portion 214 is formed on the upper punch 210 via a tapered portion 212 whose diameter is reduced downward.
【００３５】前記上型ホルダ２０６に画成された大径な
孔部２２０には前記ポンチホルダ２０４の下部に当接し
て第２上型２２２が挿入される。該第２上型２２２の外
壁には段部２２４が形成され、該段部２２４には押さえ
部材２２６が係合し、該押さえ部材２２６は前記上型ホ
ルダ２０６に固着されることによって前記第２上型２２
２は抜け止めされる。A second upper die 222 is inserted into a large-diameter hole 220 defined in the upper die holder 206 in contact with a lower portion of the punch holder 204. A step portion 224 is formed on the outer wall of the second upper mold 222, and a pressing member 226 is engaged with the step portion 224, and the pressing member 226 is fixed to the upper die holder 206, and Upper mold 22
2 is retained.
【００３６】前記第２上型２２２の上部には前記孔部２
０８と連通する傾斜部２２８が形成され、該傾斜部２２
８には前記上ポンチ２１０のテーパ部２１２が係合し、
該上ポンチ２１０が抜け止めされる。該傾斜部２２８に
連通して孔部２３０が画成され、該孔部２３０には前記
上ポンチ２１０の小径部２１４が摺動自在に挿通され
る。The upper portion of the second upper mold 222 has the hole 2
08 is formed, and the inclined portion 228 communicating with the inclined portion 22 is formed.
8 is engaged with the tapered portion 212 of the upper punch 210,
The upper punch 210 is retained. A hole 230 is defined in communication with the inclined portion 228, and the small diameter portion 214 of the upper punch 210 is slidably inserted into the hole 230.
【００３７】前記第２上型２２２の下面中央には前記孔
部２３０と連通して押圧部２３６が設けられ、該押圧部
２３６を形成する壁部には歯形２３８が形成される。前
記第２上型２２２の外周縁下面には、下方に向けて僅か
に拡径したテーパ状の段部２４０が形成される。A pressing portion 236 is provided at the center of the lower surface of the second upper die 222 in communication with the hole 230, and a tooth 238 is formed on a wall forming the pressing portion 236. On the lower surface of the outer peripheral edge of the second upper mold 222, a tapered step portion 240 whose diameter is slightly increased downward is formed.
【００３８】前記第２上型２２２が下降して、図２に示
すように、第２下型１１０を閉塞したときに、前記第２
下型１１０の載置部１２０、下ポンチ６８の先端部７
０、第２上型２２２の押圧部２３６、上ポンチ２１０の
先端部２１８でキャビティ２４２が画成される。When the second upper mold 222 is lowered and the second lower mold 110 is closed as shown in FIG.
Placement part 120 of lower die 110, tip part 7 of lower punch 68
A cavity 242 is defined by the pressing portion 236 of the second upper mold 222 and the tip 218 of the upper punch 210.
【００３９】以上のように、前記第１上型１５３、孔明
けポンチ１６４、第２上型２２２は上型取付部材１３０
に取り付けられ、該上型取付部材１３０と一体的に変位
するように構成される。As described above, the first upper die 153, the punch 164, and the second upper die 222 are connected to the upper die mounting member 130.
And is configured to be displaced integrally with the upper die attaching member 130.
【００４０】以上の如き冷間鍛造成形装置３０に近接し
て、搬送装置２５０が設けられる。この搬送装置２５０
は、図６に示すように、ワーク挟持装置２５２ａ〜２５
２ｄが夫々互いに等間隔に設けられ、該ワーク挟持装置
２５２ａ〜２５２ｄは移送機構２５４ａ、２５４ｂによ
って一体的に矢印Ａ方向に変位可能に構成される。当該
ワーク挟持装置２５２ａ〜２５２ｄは夫々シリンダ２５
６ａ、２５６ｂを備え、該シリンダ２５６ａ、２５６ｂ
は前記移送機構２５４ａ、２５４ｂに固着されている。
該シリンダ２５６ａ、２５６ｂには、図７〜図１０に示
すように、Ｌ字状に屈曲した板状のスライドテーブル２
５８ａ、２５８ｂが設けられ、該スライドテーブル２５
８ａ、２５８ｂには支持部材２６０ａ〜２６０ｈがねじ
２５９によって締結される。該支持部材２６０ａ〜２６
０ｈの先端の上部には把持爪２６２ａ〜２６２ｈがねじ
２６３によって装着される。A conveying device 250 is provided in the vicinity of the cold forging device 30 as described above. This transport device 250
As shown in FIG. 6, the workpiece holding devices 252a to 252a
The workpiece holding devices 252a to 252d are configured to be integrally displaceable in the direction of arrow A by the transfer mechanisms 254a and 254b. Each of the work holding devices 252a to 252d is a cylinder 25
6a, 256b, and the cylinders 256a, 256b
Are fixed to the transfer mechanisms 254a and 254b.
As shown in FIGS. 7 to 10, a plate-like slide table 2 bent in an L-shape is provided on the cylinders 256a and 256b.
58a and 258b, and the slide table 25
Support members 260a to 260h are fastened to 8a and 258b by screws 259. The support members 260a to 26a
Grip claws 262 a to 262 h are mounted on the top of the leading end of 0 h by screws 263.
【００４１】前記ワーク挟持装置２５２ａに設けられた
支持部材２６０ａ、２６０ｂ、把持爪２６２ａ、２６２
ｂの先端部は、図７に示すように、後述する円柱状の鍛
造用素材２７２の外面に適合するように形成されてい
る。前記ワーク挟持装置２５２ｂに設けられた把持爪２
６２ｃ、２６２ｄの先端部は、図８に示すように、傾斜
して形成され、一次成形品２６４の外面に適合する。ワ
ーク挟持装置２５２ｃ、２５２ｄに設けられた支持部材
２６０ｅ〜２６０ｈの先端部は、図９、図１０に示すよ
うに、夫々二次成形品２６６、傘歯車２６８の外縁下面
側に適合し、把持爪２６２ｅ〜２６２ｈの先端部は二次
成形品２６６、傘歯車２６８の外縁上面側に適合して形
成される。The supporting members 260a and 260b, the holding claws 262a and 262 provided on the work holding device 252a.
As shown in FIG. 7, the tip of b is formed so as to conform to the outer surface of a cylindrical forging material 272 described later. Gripping claw 2 provided on the work holding device 252b
As shown in FIG. 8, the distal ends of 62 c and 262 d are formed to be inclined and fit with the outer surface of the primary molded product 264. As shown in FIGS. 9 and 10, the distal ends of the support members 260e to 260h provided on the work holding devices 252c and 252d are adapted to the lower surface of the outer edge of the secondary molded product 266 and the bevel gear 268, respectively. The tips of 262e to 262h are formed so as to conform to the upper surface of the outer edge of the secondary molded product 266 and the bevel gear 268.
【００４２】前記ワーク挟持装置２５２ｂの支持部材２
６０ｄには、図８に示すように、光電センサ２６９が設
けられ、一方、支持部材２６０ｃには反射板２７０が設
けられ、光電センサ２６９から発せられた光が反射板２
７０で反射され、再び光電センサ２６９に入射されて信
号が発生するように構成される。このため、一次成形品
２６４が、図８中、実線で示すように、正しい姿勢で把
持爪２６２ｃ、２６２ｄに把持されているときは光電セ
ンサ２６９から発せられた光は一次成形品２６４によっ
て遮断され、再び光電センサ２６９に入射されることは
ない。一次成形品２６４が、図８中、点線で示すよう
に、傾斜したり位置ずれして把持されたときは、光電セ
ンサ２６９から発せられた光は反射板２７０で反射さ
れ、再び光電センサ２６９に入射して信号が発生する。
従って、鍛造成形の際、一次成形品２６４の傾斜、位置
ずれを検出することができる。The support member 2 of the work holding device 252b
As shown in FIG. 8, a photoelectric sensor 269 is provided on 60 d, while a reflecting plate 270 is provided on the support member 260 c, and light emitted from the photoelectric sensor 269 is reflected on the reflecting plate 2.
It is configured to be reflected at 70 and incident again on the photoelectric sensor 269 to generate a signal. For this reason, when the primary molded product 264 is gripped by the gripping claws 262c and 262d in the correct posture, as shown by the solid line in FIG. 8, light emitted from the photoelectric sensor 269 is blocked by the primary molded product 264. Are not incident on the photoelectric sensor 269 again. When the primary molded product 264 is gripped by being tilted or displaced, as indicated by a dotted line in FIG. 8, light emitted from the photoelectric sensor 269 is reflected by the reflecting plate 270, and is again transmitted to the photoelectric sensor 269. A signal is generated upon incidence.
Therefore, at the time of forging, the inclination and displacement of the primary molded product 264 can be detected.
【００４３】なお、図６に示す参照符号２７１ａ〜２７
１ｄは、前記シリンダ２５６ａ、２５６ｂが摺動する
際、スライドテーブル２５８ａ、２５８ｂが直線的に摺
動するようにガイドするためのガイド部材を示している
（図６参照）。The reference numerals 271a to 271 shown in FIG.
Reference numeral 1d denotes a guide member for guiding the slide tables 258a and 258b to slide linearly when the cylinders 256a and 256b slide (see FIG. 6).
【００４４】本実施の形態に係る傘歯車の冷間鍛造成形
装置３０は基本的には以上のように構成されるものであ
り、次にその動作について、本実施の形態に係る傘歯車
の冷間鍛造成形方法との関係で説明する。The bevel gear cold forging apparatus 30 according to the present embodiment is basically configured as described above. Next, the operation of the apparatus will be described. This will be described in relation to the hot forging method.
【００４５】先ず、図１１Ａに示す円柱状の鍛造用素材
２７２が図示しないワーク供給装置から冷間鍛造成形装
置３０に供給される。次に、図６、図７に示すように、
搬送装置２５０を構成するワーク挟持装置２５２ａに設
けられたシリンダ２５６ａ、２５６ｂが付勢される。こ
の結果、鍛造用素材２７２が把持爪２６２ａ、２６２ｂ
により挟持され、移送機構２５４ａ、２５４ｂが矢印Ａ
方向に変位することにより、該鍛造用素材２７２が第１
下型７６の載置部８０に載置される（図１参照）。First, a cylindrical forging material 272 shown in FIG. 11A is supplied to a cold forging device 30 from a work supply device (not shown). Next, as shown in FIGS.
Cylinders 256a and 256b provided on a work holding device 252a constituting the transfer device 250 are urged. As a result, the forging material 272 is moved to the gripping claws 262a, 262b.
, And the transfer mechanisms 254a and 254b are
The forging material 272 is displaced in the first direction.
It is mounted on the mounting portion 80 of the lower mold 76 (see FIG. 1).
【００４６】次に、図２に示すように、上型取付部材１
３０が第１上型１５３と一体的に下降し、前記鍛造用素
材２７２はエジェクタピン１４７の先端部１５０と第１
下型７６によって挟持される。さらに上型取付部材１３
０が下降すると、図３に示すように、コイルばね１４９
の上端部は上型取付部材１３０に当接して該コイルばね
１４９が縮退し、エジェクタピン１４７は筒状部材１４
４の内部に進入する。このため、第１上型１５３が下降
して鍛造用素材２７２を押圧して一次鍛造成形を施し、
該鍛造用素材２７２が塑性変形して凹部１５４の壁部に
すえ込まれ、図１１Ｂに示すように、傘歯車２６８の原
形形状の一次成形品２６４が成形される。このとき、一
次成形品２６４の下面は傘歯車の歯形面のない下面側の
雄雌形状に対応して成形される。この一次成形品２６４
は、後述する二次鍛造成形の際に、一次成形品２６４が
第２下型１１０または第２上型２２２に張り付くことを
防止するため、吹き付け等によりリン酸塩被膜が形成さ
れて潤滑処理が施される。また、一次成形品２６４が前
記鍛造成形により加工硬化している場合には、一次成形
品２６４を図示しない加熱装置で約７２０℃に加熱して
球状化焼鈍処理を施こした後、吹き付け等によりリン酸
塩被膜が形成されて潤滑処理が施される。 Next, as shown in FIG.
30 descends integrally with the first upper die 153, and the forging material 272 is connected to the tip 150 of the ejector pin 147 by the first
It is clamped by the lower mold 76. Further, the upper mold mounting member 13
When 0 falls, as shown in FIG.
The upper end of the coil spring 149 comes into contact with the upper mold mounting member 130 so that the coil spring 149 is retracted.
4. Enter inside 4. For this reason, the first upper die 153 descends and presses the forging material 272 to perform primary forging,
The forging material 272 is plastically deformed and is set up in the wall of the concave portion 154, and as shown in FIG. 11B, a primary molded product 264 of the original shape of the bevel gear 268 is formed. At this time, the lower surface of the primary molded product 264 is molded corresponding to the male and female shapes on the lower surface side without the bevel gear tooth profile. This primary molded product 264
, When the secondary forging section later, in order to prevent the primary molded product 264 sticks to the second lower die 110 or the second upper die 222 is phosphate coating by spraying or the like formed by lubricated Is applied. Also, the primary molded product 264 is
If the work is hardened by forging, primary molding
The product 264 is heated to about 720 ° C. with a heating device (not shown)
After spheroidizing annealing, phosphoric acid
A salt film is formed and a lubrication process is performed.
【００４７】次いで、図１に示すように、上型取付部材
１３０が第１上型１５３と一体的に上昇すると、エジェ
クタピン１４７はコイルばね１４９に押圧されて相対的
に下降して一次成形品２６４を押圧し、該一次成形品２
６４が第１上型１５３の凹部１５４に張り付くことを防
止する。次に、図６、図８に示すように、搬送装置２５
０のワーク挟持装置２５２ｂに設けられたシリンダ２５
６ａ、２５６ｂが付勢されて一次成形品２６４が把持爪
２６２ｃ、２６２ｄにより把持され、移送機構２５４
ａ、２５４ｂの移送作用下に搬送され、該一次成形品２
６４は第２下型１１０に載置される。前記一次成形品２
６４が第２下型１１０に載置されるとき、該一次成形品
２６４の下部は載置部１２０と係合し、位置決めされ
る。また、このとき、下ポンチ６８の先端部７０は一次
成形品２６４から離間している。Next, as shown in FIG. 1, when the upper mold mounting member 130 rises integrally with the first upper mold 153, the ejector pins 147 are pressed by the coil springs 149 and relatively move down, thereby lowering the primary molded product. 264 and press the primary molded product 2
64 is prevented from sticking to the concave portion 154 of the first upper die 153. Next, as shown in FIGS.
Cylinder 25 provided in the workpiece clamping device 252b
6a and 256b are urged and the primary molded product 264 is gripped by the gripping claws 262c and 262d, and the transfer mechanism 254
a, 254b, and is transported under the action of
64 is placed on the second lower mold 110. The primary molded article 2
When the second mold 64 is placed on the second lower mold 110, the lower part of the primary molded product 264 engages with the placement section 120 and is positioned. At this time, the tip portion 70 of the lower punch 68 is separated from the primary molded product 264.
【００４８】次に、図２に示すように、上型取付部材１
３０と一体的に第２上型２２２が下降し、第２下型１１
０の段部１１８と第２上型２２２の段部２４０が嵌合す
るとともに、段部１１８と段部２４０の夫々のテーパが
係合することによって第２上型２２２が第２下型１１０
に対して位置決めされ、該第２下型１１０と第２上型２
２２とが閉塞される。このとき、第２上型２２２の歯形
２３８は前記一次成形品２６４の上部から離間してお
り、該一次成形品２６４には鍛造成形は施されていな
い。従って、該歯形２３８には力が加わらず、当該歯形
２３８が損傷する懸念はない。また、油圧ユニット３８
はクッション機能を発揮し、第２下型１１０と第２上型
２２２が当接したときの衝撃を吸収し、該第２下型１１
０、第２上型２２２が損傷することを防止する。Next, as shown in FIG.
The second upper mold 222 descends integrally with the second lower mold 11.
0 and the step 240 of the second upper mold 222 are fitted together, and the respective taper of the step 118 and the step 240 are engaged with each other, so that the second upper mold 222 is
The second lower mold 110 and the second upper mold 2
22 is closed. At this time, the tooth profile 238 of the second upper mold 222 is separated from the upper part of the primary molded product 264, and the primary molded product 264 is not forged. Therefore, no force is applied to the tooth profile 238, and there is no fear that the tooth profile 238 is damaged. Also, the hydraulic unit 38
Exerts a cushioning function, absorbs the shock when the second lower mold 110 and the second upper mold 222 come into contact with each other, and
0, to prevent the second upper mold 222 from being damaged.
【００４９】図３に示すように、上型取付部材１３０が
さらに下降すると、図示しない緩衝手段が縮退して中間
プレート１００が下降し、第２下型１１０と第２上型２
２２は閉塞した状態で一次成形品２６４と共に下降し、
ポンチホルダ１０４が台座５４と当接する。そして、油
圧ユニット３８から圧油が所定量排出され、押圧部材４
２は前記油圧ユニット３８の内部を下降し、一次成形品
２６４も下降する。このとき、下ポンチ６８は下降しな
いため、該下ポンチ６８が第２下型１１０に対して相対
的に上方に変位することになり、載置部１２０の中に当
該下ポンチ６８の先端部７０が押圧進入するに至る。こ
のため、前記一次成形品２６４に二次鍛造成形が施さ
れ、該一次成形品２６４が塑性変形してキャビティ２４
２を構成する壁部にすえ込まれ、図１１Ｃに示すよう
に、該一次成形品２６４には第２上型２２２の歯形２３
８に対応する歯形２７４が形成され、二次成形品２６６
が成形される。As shown in FIG. 3, when the upper mold mounting member 130 is further lowered, the buffer means (not shown) is retracted and the intermediate plate 100 is lowered, and the second lower die 110 and the second upper die 2 are lowered.
22 is lowered together with the primary molded product 264 in a closed state,
The punch holder 104 contacts the pedestal 54. The hydraulic unit 3 eight et pressure oil is predetermined emissions, the pressing member 4
2 descends inside the hydraulic unit 38, and the primary molded product 264 also descends. At this time, since the lower punch 68 does not descend, the lower punch 68 is displaced relatively upward with respect to the second lower mold 110, and the leading end 70 of the lower punch 68 is placed in the mounting portion 120. Is pressed and entered. For this reason, secondary forging is performed on the primary molded product 264, and the primary molded product 264 is plastically deformed to form the cavity 24.
2, and as shown in FIG. 11C, the primary molded product 264 has the tooth profile 23 of the second upper mold 222.
8 is formed, and the secondary molded product 266 is formed.
Is molded.
【００５０】次に、図１に示すように、第２上型２２２
が上昇し、二次成形品２６６は、図６、図９に示す搬送
装置２５０を構成するワーク挟持装置２５２ｃによって
第２下型１１０から孔明けダイ８８に搬送される。Next, as shown in FIG.
Rises, and the secondary molded product 266 is transported from the second lower die 110 to the punching die 88 by the work holding device 252c constituting the transport device 250 shown in FIGS.
【００５１】次いで、図２に示すように、上型取付部材
１３０がストリッパ１９４と一体的に下降すると、該ス
トリッパ１９４の凹部２００が二次成形品２６６の上部
に係合し、該二次成形品２６６はストリッパ１９４に対
して位置決めされる。さらに上型取付部材１３０が下降
すると、図５に示すように、コイルばね１８０ａ、１８
０ｂは保持プレート１８４と上型取付部材１３０に押圧
されて縮退し、孔明けポンチ１６４が前記上型取付部材
１３０および支持部材１５６に押圧されて下降し、前記
ストリッパ１９４の孔部２０２から下方に突出して二次
成形品２６６の上部から進入して打ち抜き、図１１Ｄに
示すように、前記二次成形品２６６に孔部２７６が画成
されて傘歯車２６８の完成品が得られる。このとき、該
孔部２７６が画成されることによって発生したスクラッ
プ２７８は、孔明けダイ８８に画成された孔部９６を挿
通して孔部８６から外部に排出される。Next, as shown in FIG. 2, when the upper mold mounting member 130 is lowered integrally with the stripper 194, the concave portion 200 of the stripper 194 is engaged with the upper part of the secondary molded product 266, and the secondary molding is performed. Article 266 is positioned relative to stripper 194. When the upper mold mounting member 130 further descends, as shown in FIG.
Ob is pressed by the holding plate 184 and the upper die mounting member 130 and contracts, and the punch 164 is pressed by the upper die mounting member 130 and the support member 156 to descend, and moves downward from the hole 202 of the stripper 194. It protrudes, enters from the upper part of the secondary molded product 266, and is punched out. As shown in FIG. 11D, a hole 276 is defined in the secondary molded product 266, and a completed product of the bevel gear 268 is obtained. At this time, the scrap 278 generated by the formation of the hole 276 is discharged through the hole 86 through the hole 96 defined in the punching die 88.
【００５２】そして、上型取付部材１３０が上昇し、傘
歯車２６８は、図６、図１０に示すワーク挟持装置２５
２ｄによって次の工程に搬送される。次の工程では、図
１１Ｅに示すように、傘歯車２６８のバリ、孔部の内部
等が切削される。このとき、傘歯車２６８には既に歯形
面のない下面側の形状が成形されているため、従来技術
に係る傘歯車の製造方法のように、下面側を切削加工に
よって成形する必要がない。Then, the upper mold mounting member 130 is raised, and the bevel gear 268 is moved to the work holding device 25 shown in FIGS.
It is transported to the next step by 2d. In the next step, as shown in FIG. 11E, burrs of the bevel gear 268, the inside of the holes, and the like are cut. At this time, since the bevel gear 268 has already been formed with the shape on the lower surface side having no tooth profile, it is not necessary to form the lower surface side by cutting as in the method of manufacturing a bevel gear according to the related art.
【００５３】以上のようにして傘歯車が製造されるが、
鍛造用素材２７２が第１下型７６に搬送される工程と、
一次成形品２６４が第１下型７６から第２下型１１０に
搬送される工程と、二次成形品２６６が第２下型１１０
から孔明けダイ８８に搬送される工程と、傘歯車２６８
が孔明けダイ８８から次の工程に搬送される工程が同時
に行われ、また、第１下型７６、第２下型１１０、孔明
けダイ８８に第１上型１５３、第２上型２２２、孔明け
ポンチ１６４が下降し、鍛造成形、孔明け加工を施す工
程も同時に行われる。従って、傘歯車２６８は連続的に
成形され、上型取付部材１３０が一回上下動する毎に一
つの傘歯車２６８が成形されることになる。The bevel gear is manufactured as described above.
A step of transferring the forging material 272 to the first lower mold 76;
A step in which the primary molded product 264 is transported from the first lower mold 76 to the second lower mold 110;
And the bevel gear 268
Are transferred from the punching die 88 to the next step at the same time, and the first lower die 76, the second lower die 110, and the first upper die 153, the second upper die 222, The punch 164 is lowered, and the steps of forging and punching are performed at the same time. Therefore, the bevel gear 268 is formed continuously, and one bevel gear 268 is formed each time the upper die mounting member 130 moves up and down once.
【００５４】[0054]
【発明の効果】本発明に係る傘歯車の鍛造成形方法およ
びその装置によれば、以下のような効果ならびに利点が
得られる。According to the method and apparatus for forging a bevel gear according to the present invention, the following effects and advantages can be obtained.
【００５５】下型と上型とを閉塞させる際、一次成形品
の上部は上型に形成された歯形から離間し、下ポンチま
たは上ポンチの少なくともいずれか一方をキャビティに
進入させて前記一次成形品を塑性変形させて成形するた
め、上型の歯形が損傷することがなく、一回の鍛造成形
で傘歯車の歯形を成形することができる。このため、鍛
造成形工程を減少させることが可能となり、これに伴
い、各鍛造成形工程毎に行われていた焼鈍工程、潤滑処
理工程も少なくなり、従って、製造時間が短縮化し、し
かも製造装置を簡素化することができる。また、一つの
冷間鍛造成形装置で鍛造成形、孔明け加工を同時に行う
ことが可能となり、従って、生産効率が向上し、製造コ
ストも低廉化することが可能となる。しかも、成形品等
を貯留しておく必要がないため、スペースの有効活用も
なされる等の特有の効果が得られる。When the lower mold and the upper mold are closed, the upper part of the primary molded product is separated from the tooth shape formed on the upper mold, and at least one of the lower punch and the upper punch enters the cavity to form the primary molded product. Since the product is formed by plastic deformation, the tooth profile of the upper die is not damaged, and the tooth profile of the bevel gear can be formed by one forging process. For this reason, it is possible to reduce the number of forging steps, and accordingly, the number of annealing steps and lubrication steps that have been performed for each forging step is also reduced. It can be simplified. In addition, forging and drilling can be performed simultaneously by one cold forging apparatus, so that production efficiency can be improved and manufacturing costs can be reduced. In addition, since there is no need to store the molded articles and the like, unique effects such as effective use of space can be obtained.
【図１】本発明の実施の形態に係る冷間鍛造成形装置を
示す正面断面図である。FIG. 1 is a front sectional view showing a cold forging apparatus according to an embodiment of the present invention.
【図２】図１の冷間鍛造成形装置の使用方法を示し、下
型と上型が閉塞している状態の正面断面図である。FIG. 2 is a front sectional view showing a method of using the cold forging apparatus of FIG. 1, in which a lower mold and an upper mold are closed.
【図３】図１の冷間鍛造成形装置の使用方法を示し、下
ポンチがキャビティに進入している状態の正面断面図で
ある。FIG. 3 is a front sectional view showing a method of using the cold forging apparatus of FIG. 1, in which a lower punch has entered a cavity.
【図４】図１の冷間鍛造成形装置の孔明けポンチを示す
側面断面図である。FIG. 4 is a side sectional view showing a punch for punching the cold forging apparatus of FIG. 1;
【図５】図４の冷間鍛造成形装置の孔明けポンチの使用
方法を示し、成形品に孔明け加工を施している状態の側
面断面図である。FIG. 5 is a side cross-sectional view showing a method of using the punch for punching of the cold forging apparatus of FIG. 4 in a state in which a molded product is subjected to punching.
【図６】図１の冷間鍛造成形装置に使用される搬送装置
を示す平面図である。FIG. 6 is a plan view showing a transfer device used in the cold forging apparatus of FIG. 1;
【図７】図６の搬送装置を示すＶＩＩ−ＶＩＩ線断面図
である。FIG. 7 is a sectional view taken along line VII-VII of the transfer device of FIG. 6;
【図８】図６の搬送装置を示すＶＩＩＩ−ＶＩＩＩ線断
面図である。FIG. 8 is a sectional view taken along line VIII-VIII of the transfer device of FIG. 6;
【図９】図６の搬送装置を示すＩＸ−ＩＸ線断面図であ
る。FIG. 9 is a sectional view taken along line IX-IX showing the transfer device of FIG. 6;
【図１０】図６の搬送装置を示すＸ−Ｘ線断面図であ
る。FIG. 10 is a sectional view taken along line XX of the transfer device of FIG. 6;
【図１１】本発明の実施の形態に係る鍛造成形方法によ
って成形される傘歯車を示し、図１１Ａは、鍛造成形が
施される前の鍛造用素材の概略縦断面図、図１１Ｂは、
一次成形品の概略縦断面図、図１１Ｃは、歯形が成形さ
れた二次成形品の概略縦断面図、図１１Ｄは、孔明け加
工が施された完成品の概略縦断面図、図１１Ｅは、切削
加工が施された完成品の概略縦断面図である。11 shows a bevel gear formed by a forging method according to an embodiment of the present invention, FIG. 11A is a schematic longitudinal sectional view of a forging material before forging is performed, and FIG.
FIG. 11C is a schematic longitudinal sectional view of a secondary molded product in which a tooth profile is formed, FIG. 11D is a schematic longitudinal sectional view of a finished product subjected to a punching process, and FIG. FIG. 1 is a schematic vertical sectional view of a finished product subjected to cutting.
【図１２】従来技術に係る鍛造成形方法によって成形さ
れる傘歯車を示し、図１２Ａは、鍛造成形が施される前
の鍛造用素材の概略縦断面図、図１２Ｂは、一次成形品
の概略縦断面図、図１２Ｃは、二次鍛造成形によって成
形された二次成形品の概略縦断面図、図１２Ｄは、三次
鍛造成形によって成形された三次成形品の概略縦断面
図、図１２Ｅは、孔明け加工が施された三次成形品の概
略縦断面図、図１２Ｆは、切削加工が施された傘歯車の
概略縦断面図である。12 shows a bevel gear formed by a forging method according to the prior art, FIG. 12A is a schematic longitudinal sectional view of a forging material before forging is performed, and FIG. 12B is a schematic of a primary molded product. FIG. 12C is a schematic longitudinal sectional view of a secondary molded product formed by secondary forging, FIG. 12D is a schematic longitudinal sectional view of a tertiary molded product formed by tertiary forging, FIG. FIG. 12F is a schematic longitudinal sectional view of a bevel gear that has been subjected to a cutting process. FIG. 12F is a schematic longitudinal sectional view of a bevel gear that has been subjected to a cutting process.
３０…冷間鍛造成形装置 ６８…下ポンチ ７６、１１０…下型 ８８…孔明けダイ １３０…上型取付部材 １５３、２２２…上
型 １６４…孔明けポンチ ２１０…上ポンチ ２５０…搬送装置Reference Signs List 30 cold forging device 68 lower punch 76, 110 lower die 88 punching die 130 upper die mounting member 153, 222 upper die 164 punching punch 210 upper punch 250 transporter
フロントページの続き (56)参考文献 特開 昭62−45441（ＪＰ，Ａ) 特開 昭61−129249（ＪＰ，Ａ) 特開 昭56−91950（ＪＰ，Ａ) 特開 平２−121744（ＪＰ，Ａ) 特開 平７−80590（ＪＰ，Ａ) 特開 昭54−68753（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B21J 1/00 - 13/14 B21K 1/00 - 31/00 Continuation of front page (56) References JP-A-62-45441 (JP, A) JP-A-61-129249 (JP, A) JP-A-56-91950 (JP, A) JP-A-2-121744 (JP) JP-A-7-80590 (JP, A) JP-A-54-68753 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B21J 1/00-13/14 B21K 1/00-31/00
Claims (3)
の方法において、 ワークに鍛造成形を施すことにより傘歯車の原形形状に
成形された一次成形品を得る工程と、前 記一次成形品に潤滑処理を施す工程と、 前記潤滑処理が施された一次成形品を、加工される傘歯
車の歯形が形成される部位を上方に向けて下型に載置す
る工程と、 上型に形成された歯形を前記一次成形品から離間した状
態で当該上型と前記下型とを当接閉塞させる工程と、 下ポンチまたは上ポンチの少なくともいずれか一方をキ
ャビティに進入させて前記一次成形品を押圧し、前記キ
ャビティを画成する下型と上型の壁部に前記一次成形品
をすえ込み、鍛造成形を施して二次成形品を得る工程
と、前記二次成形品を孔明けダイに載置する工程と、 前記孔明けダイに対して孔明けポンチを変位させて 前記
二次成形品に孔明け加工を施し、完成した傘歯車を得る
工程と、を有し、前記一次成形品を得る工程と、前記二
次成形品を得る工程と、前記孔 明け加工を施す工程とを同時に行い、夫々加工が施され
たワークを同時に次の工程に搬送 することを特徴とする
傘歯車の冷間鍛造成形方法。The method according to claim 1] bevel gear in a method for forming by cold forging, a step of obtaining a primary molded article molded in the original shape of the bevel gear by performing forging the work, before Symbol primary molded product a step of mounting the lower mold and the step of applying a lubricant treatment, the pre KiJun sliding treatment decorated with primary molded product, towards the site of tooth bevel gears to be machined is formed above the upper mold It enters a step of abutting blocks the with the upper mold and the lower mold, at least one of the lower punch or upper punch to key <br/> Yabiti in a state in which the formed tooth spaced from said primary molded article presses the primary molded article by the key <br/> Yabiti the swaging the primary molded article to the wall of the lower mold and the upper mold defining a to obtain a secondary molded product is subjected to forging process When the step of placing said secondary molded article to punching die, the punch die A step of displacing the drilling punch subjected to drilling to the secondary molded product, possess obtaining a finished bevel gears, to give the primary molded article against, the two
The step of obtaining the next molded article and the step of performing the perforating process are performed simultaneously, and the respective processes are performed.
A bevel gear for cold forging, wherein the work is transferred to the next step at the same time .
の方法において、傘歯車の原形形状に成形され 中間焼鈍および潤滑処理が
施された一次成形品を、加工される傘歯車の歯形が形成
される部位を上方に向けて下型に載置する工程と、上 型に形成された歯形を前記一次成形品から離間した状
態で当該上型と前記下型とを当接閉塞させる工程と、 下ポンチまたは上ポンチの少なくともいずれか一方をキ
ャビティに進入させて前記一次成形品を押圧し、前記キ
ャビティを画成する下型と上型の壁部に前記一次成形品
をすえ込み、鍛造成形を施して二次成形品を得る工程
と、 前記二次成形品を孔明けダイに載置する工程と、 前記孔明けダイに対して孔明けポンチを変位させて前記
二次成形品に孔明け加工を施し、完成した傘歯車を得る
工程と、 を有し、前記二次成形品を得る工程と、前記孔明け加工
を施す工程とを同時に行い、夫々加工が施されたワーク
を同時に次の工程に搬送することを特徴とする傘歯車の
冷間鍛造成形方法。2. A method for forming a bevel gear by cold forging, comprising: forming a bevel gear having a primary shape formed into an original shape of a bevel gear and having been subjected to intermediate annealing and lubrication processing; a step of mounting the lower mold a site formed upward, the upper mold and said lower mold Ru abut closed in a state in which a tooth profile formed in the upper mold is spaced from the primary molded product process and, at least one of the lower punch or the upper punch by entering the key <br/> Yabiti presses the primary molded product, the lower die defining the key <br/> Yabiti upper mold walls the separate component upsetting the primary molded product, and obtaining a secondary molded article is subjected to forging, a step for placing said secondary molded article to punching die, punch punch relative to the punch die by displacing subjected to drilling to the secondary molded article to obtain a finished bevel gear Engineering And a step of obtaining the secondary molded article;
Workpieces that have been processed at the same time
Of a bevel gear for cold forging.
の装置において、ワークを傘歯車の原形形状に鍛造成形して一次成形品を
得るための第１下型および第１上型と、 前記一次成形品の歯形面のない下面側の雄雌形状に対応
した雌雄形状の載置部を有する第２下型と、 完成した傘歯車の歯形の雄雌形状に対応する雌雄形状の
歯形が形成され、 前記第２下型に対して接近離間自在な
第２上型と、前記第２下型に画成された孔部内に設けられ、該第２下
型に対して相対的に変位自在な下ポンチと、 前記第２下型に隣接する孔明けダイと、 前記第１上型、第２上型と一体的に構成され、前記孔明
けダイに対して接近離間自在な孔明けポンチと、 ワークを前記第１下型から第２下型に、前記第２下型か
ら孔明けダイに、前記孔明けダイから次の工程へと順次
搬送する搬送手段と、 を備え、前記第２下型と第２上型とを閉塞したときに、
該第２上型に形成された歯形は前記第２下型に載置され
た一次成形品と離間し、前記第１上型、第２上型と孔明
けポンチは一体的に変位して夫々前記第１下型、第２下
型、孔明けダイに載置されたワークに鍛造成形、孔明け
加工を同時に行い、夫々加工が施されたワークを同時に
次の工程に搬送することを特徴とする傘歯車の冷間鍛造
成形装置。3. An apparatus for forming a bevel gear by cold forging, comprising: forging a work into an original shape of a bevel gear to form a primary molded product.
Corresponding to the first lower mold and the first upper mold to obtain, and the male and female shapes on the lower surface side without the tooth profile surface of the primary molded product
A second lower die having a male and female mounting portion, and a male and female shape corresponding to the toothed male and female shape of the completed bevel gear
A tooth profile is formed, and it is free to approach and separate from the second lower mold.
A second upper die and a second lower die provided in a hole defined in the second lower die;
A lower punch that is relatively displaceable with respect to the mold, a punching die adjacent to the second lower die, and the first upper die and the second upper die are integrally formed with the punching die. A punch that can be freely approached and separated, and transport means for sequentially transporting a workpiece from the first lower die to the second lower die, from the second lower die to the punch die, and from the punch die to the next step. And when closing the second lower mold and the second upper mold,
The tooth profile formed on the second upper mold is placed on the second lower mold.
The first upper die, the second upper die, and the punch are displaced integrally with each other and are placed on the first lower die, the second lower die, and the punch die, respectively. forging, have simultaneously rows drilling, each processing a workpiece which has been subjected at the same time
A bevel gear cold forging apparatus characterized by being transported to the next step .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7327570A JP3031850B2 (en) | 1995-12-15 | 1995-12-15 | Method and apparatus for cold forging of bevel gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7327570A JP3031850B2 (en) | 1995-12-15 | 1995-12-15 | Method and apparatus for cold forging of bevel gear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09164447A JPH09164447A (en) | 1997-06-24 |
| JP3031850B2 true JP3031850B2 (en) | 2000-04-10 |
Family
ID=18200547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7327570A Expired - Fee Related JP3031850B2 (en) | 1995-12-15 | 1995-12-15 | Method and apparatus for cold forging of bevel gear |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3031850B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7888387B2 (en) | 2000-08-17 | 2011-02-15 | Diyun Huang | Electro-optic chromophore having an edot structure, and related methods and apparatuses |
| CN102430692A (en) * | 2011-10-19 | 2012-05-02 | 浙江工业大学 | Cold precision forging process for bevel gear and mould thereof |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4920452B2 (en) * | 2006-02-28 | 2012-04-18 | 昭和電工株式会社 | Hot forging device, forged product manufacturing method and forged product |
| CN103419002B (en) * | 2013-07-31 | 2016-03-02 | 霍山汇能汽车零部件制造有限公司 | The warm cold precision forming method of large modulus high boss bevel gear |
| CN104511561A (en) * | 2013-12-14 | 2015-04-15 | 柳州市国顺机械制造有限公司 | Pre-upsetting die for intermediate input shaft of loading machine |
| CN114226612B (en) * | 2021-12-03 | 2024-02-20 | 湖州精锤铸锻有限公司 | Forging die and forging method for gear forging for automobile rear axle and gear forging |
-
1995
- 1995-12-15 JP JP7327570A patent/JP3031850B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7888387B2 (en) | 2000-08-17 | 2011-02-15 | Diyun Huang | Electro-optic chromophore having an edot structure, and related methods and apparatuses |
| CN102430692A (en) * | 2011-10-19 | 2012-05-02 | 浙江工业大学 | Cold precision forging process for bevel gear and mould thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09164447A (en) | 1997-06-24 |
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