JP2774596B2 - Method of forming internal tooth profile with bottom - Google Patents
Method of forming internal tooth profile with bottomInfo
- Publication number
- JP2774596B2 JP2774596B2 JP22025989A JP22025989A JP2774596B2 JP 2774596 B2 JP2774596 B2 JP 2774596B2 JP 22025989 A JP22025989 A JP 22025989A JP 22025989 A JP22025989 A JP 22025989A JP 2774596 B2 JP2774596 B2 JP 2774596B2
- Authority
- JP
- Japan
- Prior art keywords
- tooth profile
- forming
- tooth
- internal tooth
- bottom plate
- 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 - Lifetime
Links
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- Forging (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は底付きインターナル歯形を鍛造により成形す
る底付きインターナル歯形の成形方法に関する。Description: TECHNICAL FIELD The present invention relates to a method of forming a bottomed internal tooth profile by forging a bottomed internal tooth profile.
この種の成形方法としては、特開昭61−269951号公報
に開示されている技術があり、これは、第８図に示され
るように、ダイ２内にばねを介してフローティング支持
される下パンチ４の上面に、カップ状の素材Ｗを開口端
を下向きとしてセットし、この素材Ｗの底板を上パンチ
６と下パンチ４とで挟持しつつ、カップ開口端より押出
し成形して下パンチ４の外周に設けた歯形５に倣ってイ
ンターナル歯形を成形する方法である。As a molding method of this kind, there is a technique disclosed in Japanese Patent Application Laid-Open No. 61-269951, which employs a lower support which is floating supported in a die 2 via a spring as shown in FIG. A cup-shaped material W is set on the upper surface of the punch 4 with the opening end facing downward, and the bottom plate of the material W is extruded from the opening end of the cup while being sandwiched between the upper punch 6 and the lower punch 4. Is a method of forming an internal tooth profile following the tooth profile 5 provided on the outer circumference of the internal gear.
しかし前記した従来方法では、ダイ２の内周面に周設
されているオリフィス３によって素材Ｗをこじらせて歯
形５に倣った形状に塑性変形させるようになっている
が、オリフィス３は同一内径のストレート状部2aから急
突出しており、素材Ｗの扱き時にオリフィス３には大き
な衝撃力が作用し、摩耗が激しく耐久性に欠けるという
問題がある。また従来方法では、素材底板部手前におい
て、上パンチによる押し込みを止めて底板部周りには歯
形を成形しないようになっているため、底板部近傍での
歯形の成形具合が十分でないという問題もあった。However, in the above-described conventional method, the material W is twisted by the orifice 3 provided on the inner peripheral surface of the die 2 to be plastically deformed into a shape following the tooth shape 5, but the orifice 3 has the same inner diameter. Since the orifice 3 projects sharply from the straight portion 2a, a large impact force acts on the orifice 3 when the material W is handled. In addition, in the conventional method, since the pressing by the upper punch is stopped in front of the material bottom plate and the tooth profile is not formed around the bottom plate, there is also a problem that the shape of the tooth profile near the bottom plate is not sufficient. Was.
本発明は前記従来技術の問題点に鑑みなされたもの
で、その目的は素材に塑性変形を与えるダイ側の扱き部
における摩耗度が少なく、カップ状素材の筒状部外周に
歯形をきっちりと成形することのできる底付きインター
ナル歯形の成形方法を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and has as its object the purpose of forming a tooth profile on the outer periphery of a cylindrical portion of a cup-shaped material with a small degree of wear at a handle portion on a die side that gives plastic deformation to the material. It is an object of the present invention to provide a method of forming a bottomed internal tooth profile that can be performed.
前記目的を達成するために、本発明に係る底付きイン
ターナル歯形の成形方法においては、ダイ内にフローテ
ィング支持される下パンチの上面にカップ状の素材をそ
の開口端を下向きにセットし、素材の底板を上パンチと
前記下パンとで挟持しつつ、カップ開口端より押込み鍛
造して下パンチの外周に設けた歯形に倣ってインターナ
ル歯形を形成する底付きインターナル歯形の成形方法で
あって、前記ダイの歯形成形面は、開口端からゆるやか
な傾斜角をもってのびるテーパ面形状の素材導入部と、
素材導入部の最小縮径部である素材扱き部と、この扱き
部から下方に真直ぐに延びる素材馴らし部とから構成さ
れて、素材の底板を前記扱き部を越えた位置まで押し込
むようにしたものである。In order to achieve the above object, in the method of forming a bottomed internal tooth profile according to the present invention, a cup-shaped material is set on the upper surface of a lower punch floatingly supported in a die with its open end facing downward, And forming the internal tooth profile following the tooth profile provided on the outer periphery of the lower punch by pressing and forging from the opening end of the cup while holding the bottom plate between the upper punch and the lower pan. The tooth forming surface of the die has a tapered surface material introduction portion extending with a gentle inclination angle from the opening end,
A material handling portion, which is a minimum diameter reducing portion of the material introduction portion, and a material conditioning portion extending straight down from the handling portion, wherein the bottom plate of the material is pushed to a position beyond the handling portion. It is.
ダイと下パンチが噛み合うことにより、ダイと下パン
チ間の素材は軸方向にしごかれて下パンチ外周の歯型に
倣った形状に成形される。When the die and the lower punch are engaged, the material between the die and the lower punch is squeezed in the axial direction and formed into a shape following the tooth pattern on the outer periphery of the lower punch.
特に素材は、テーパ面形状の素材導入部及び扱き部に
よって変形され扱かれるので、素材はゆっくりと塑性変
形し、扱き部の摩耗度が少ない。また素材の底板部をダ
イ側の扱き部位置を越えた位置まで押し込むので、筒状
部外周にきっちりと歯形が成形される。In particular, since the material is deformed and handled by the material introduction portion and the handle portion having a tapered surface shape, the material is plastically deformed slowly, and the wear of the handle portion is small. Further, since the bottom plate portion of the material is pushed to a position beyond the position of the handle on the die side, a tooth profile is formed exactly on the outer periphery of the cylindrical portion.
次に、本発明の実施例を図面に基づいて説明する。 Next, an embodiment of the present invention will be described with reference to the drawings.
第１図〜第４図は本発明に係る方法を実施するための
一例を示すもので、第１図は成形装置の概要を示す断面
図、第１図（ａ）は成形前の素材及び同装置によって成
形された成形品の斜視図、第２図（ａ）及び（ｂ）は素
材の筒状部内周面に歯形を成形する手順を説明する説明
図、第３図は扱き部によって歯形が成形される様子を説
明する説明図、第４図は第１図に示す線IV−IVに沿う断
面図である。1 to 4 show an example for carrying out the method according to the present invention. FIG. 1 is a cross-sectional view showing an outline of a molding apparatus, and FIG. FIGS. 2 (a) and 2 (b) are perspective views of a molded product formed by the apparatus, FIGS. 2 (a) and 2 (b) are explanatory views illustrating a procedure for forming a tooth profile on the inner peripheral surface of a cylindrical portion of a material, and FIG. FIG. 4 is a cross-sectional view taken along line IV-IV shown in FIG.
これらの図において、符号Ｗは底面部12の周縁に筒状
部14が形成されているカップ状の素材である。符号16は
上下方向昇降動作可能に配置された上パンチで、素材Ｗ
を下方に押し下げる働きがある。符号20は上パンチ16に
上下方向対向配置された下パンチで、ばね部材（図示せ
ず）によって上方に付勢されており、上パンチ16と協働
して素材Ｗの底板部領域をクランプし、上パンチ16の下
降力に押圧されて上パンチ16と連動して下降するように
なっている。下パンチ20を支持するばね部材としては、
圧縮コイルスプリングや油圧、空気圧シリンダ等が考え
られる。また下パンチ20の先端部外周面には、歯型山部
22aと歯型谷部22bよりなる成形用歯型22が形成されてい
る。In these figures, reference numeral W denotes a cup-shaped material in which a cylindrical portion 14 is formed on the periphery of the bottom portion 12. Reference numeral 16 denotes an upper punch arranged so as to be able to move up and down in the vertical direction.
Work downward. Reference numeral 20 denotes a lower punch which is disposed to face the upper punch 16 in the vertical direction, and is urged upward by a spring member (not shown) to clamp the bottom plate region of the material W in cooperation with the upper punch 16. The lower punch 16 is pressed by the lowering force of the upper punch 16 and lowers in conjunction with the upper punch 16. As a spring member for supporting the lower punch 20,
Compression coil springs, hydraulic and pneumatic cylinders and the like are conceivable. The outer peripheral surface of the tip of the lower punch 20 has a tooth-shaped peak
A molding tooth mold 22 composed of 22a and tooth mold valleys 22b is formed.
符号30は、前記下パンチ20を取り囲むように配置され
たダイで、上方開口端側には徐々に径が小さくなるテー
パ面形状の素材導入面32aが形成され、このテーパ面形
状の素材導入面32aは最縮径部位置において直円筒面32c
につながっている。そして素材導入面32aと直円筒面32b
間には屈曲された扱き部32cが形成されている。即ち、
ダイ30には、素材Ｗを扱き部32cにスムーズに導入する
ための素材導入面32aと、素材を軸方向に扱く扱き部32c
と、扱かれた素材を歯型22に押圧状態に保持する直円筒
面32bとからなる歯形成形面32が形成されている。なお
扱き部32cは、直線状の素材導入面32aと直円筒面32b間
の屈曲部ではあるが、丸みを帯びており、扱き作用時に
おける過大摩擦力の発生を抑制している。そして素材Ｗ
の筒状部は、素材導入面32aによって開口側から徐々に
半径方向内側に変形させられるとともに、扱き部32cに
よって軸方向に扱かれて、歯型22の谷部22b内に素材の
一部が塑性流動し、この状態のまま直円筒部32bで保持
されることにより成形される。このテーパ面形状の素材
導入面32aは、素材Ｗを半径方向内側に徐々に巾寄せ
し、このため扱き部32cと素材Ｗ間の摩擦力は、従来の
オリフィスによる扱き摩擦力に比べて著しく小さい。従
って扱き部32cの摩耗度もそれだけ少ない。またたとえ
扱き部32cが摩耗したとしても、扱き部32cの位置が摩耗
した分だけ下方に移行するだけであり、歯形を成形する
上では何ら問題はない。なお素材導入面32aのテーパ角
は、３〜10度、望ましくは２度〜６度の範囲で、素材の
延性や硬度により適切なテーパ角を選択する。Reference numeral 30 denotes a die arranged so as to surround the lower punch 20, and a tapered surface material introduction surface 32a whose diameter gradually decreases is formed on the upper open end side, and the tapered surface material introduction surface is formed. 32a is a straight cylindrical surface 32c at the position of the smallest diameter part
Is connected to And material introduction surface 32a and right cylindrical surface 32b
A bent handling portion 32c is formed between them. That is,
The die 30 has a material introduction surface 32a for smoothly introducing the material W into the handling portion 32c, and a handling portion 32c for handling the material in the axial direction.
And a straight cylindrical surface 32b that holds the handled material against the tooth mold 22 in a pressed state is formed. Although the handling portion 32c is a bent portion between the linear material introduction surface 32a and the straight cylindrical surface 32b, the handling portion 32c is rounded and suppresses the generation of an excessive friction force during the handling operation. And material W
The cylindrical portion is gradually deformed radially inward from the opening side by the material introduction surface 32a, and is axially handled by the handling portion 32c, and a part of the material is located in the valley portion 22b of the tooth form 22. It is formed by plastically flowing and held in this state by the straight cylindrical portion 32b. The tapered surface material introduction surface 32a gradually narrows the material W inward in the radial direction, so that the frictional force between the handle portion 32c and the material W is significantly smaller than the frictional force by the conventional orifice. . Therefore, the degree of wear of the handling portion 32c is also less. Even if the handle portion 32c is worn, the position of the handle portion 32c only shifts downward by the amount of wear, and there is no problem in forming the tooth profile. The taper angle of the material introduction surface 32a is in the range of 3 to 10 degrees, desirably 2 to 6 degrees, and an appropriate taper angle is selected according to the ductility and hardness of the material.
次ぎに、カップ状素材の筒状部の内周面にスプライン
溝を成形する手順を第２図（ａ），（ｂ）を参照して説
明する。Next, a procedure for forming a spline groove in the inner peripheral surface of the cylindrical portion of the cup-shaped material will be described with reference to FIGS. 2 (a) and 2 (b).
まず板金製円盤をしぼり加工したカップ状素材Ｗを用
意しておく。このカップ状素材Ｗの筒状部14は、第２図
（ａ）及び第４図に示されるように、下パンチ先端部に
形成されている成形用歯型22にちょうど緩挿できる大き
さとされている。またダイ側の直円筒面32bとパンチ側
の歯型山部22aとの間隔ｄは、第４図に示されるよう
に、素材筒材部14の板厚ｔより小さくされている。First, a cup-shaped material W obtained by squeezing a sheet metal disk is prepared. As shown in FIGS. 2 (a) and 4, the cylindrical portion 14 of the cup-shaped material W has a size that can be loosely inserted into the molding tooth 22 formed at the tip of the lower punch. ing. The interval d between the straight cylindrical surface 32b on the die side and the tooth-shaped ridge 22a on the punch side is smaller than the plate thickness t of the raw material tube member 14, as shown in FIG.
そして第２図（ａ）に示されるように、素材Ｗを下パ
ンチ20の先端部に緩挿配置し、上パンチ16を下降させ
て、素材の底板部12を下パンチ20に押しつけた状態で素
材筒状部14をダイ30の素材導入面32aに押し込み、素材
底板部がダイ側の扱き部32cより下方となる位置まで押
し込む。素材筒状部14は、第３図に示されるように、素
材導入面32aから扱き部32cにかけた領域により、特に扱
き部32cより扱かれて下パンチ20の歯型22に抱き付く作
用が生じ、第３図符号14aに示されるように、パンチ側
の歯型谷部22b内に筒状部14の一部が塑性流動して押し
込まれるとともに、軸方向に延伸される。こうして第１
図（ａ）に示されるように、筒状部14の内周面にスプラ
イン溝15が成形された成形品が得られる。この後、成形
品を取り出し、筒状部14の端面を所定位置（符号Ｌで示
す）まで切削して成形品が出来上がる。Then, as shown in FIG. 2 (a), the material W is loosely placed at the tip of the lower punch 20, the upper punch 16 is lowered, and the material bottom plate 12 is pressed against the lower punch 20. The material tubular portion 14 is pushed into the material introduction surface 32a of the die 30, and the material bottom plate is pushed to a position below the handle 32c on the die side. As shown in FIG. 3, the material cylindrical portion 14 is particularly handled by the gripping portion 32c and has a function of hugging the tooth form 22 of the lower punch 20 due to the region extending from the material introduction surface 32a to the gripping portion 32c. As shown in FIG. 3A, a portion of the cylindrical portion 14 is plastically pushed into the tooth-shaped valley portion 22b on the punch side while being stretched in the axial direction. Thus the first
As shown in FIG. 5A, a molded product in which the spline groove 15 is molded on the inner peripheral surface of the cylindrical portion 14 is obtained. Thereafter, the molded product is taken out, and the end surface of the cylindrical portion 14 is cut to a predetermined position (denoted by L) to complete the molded product.
なお前記した成形工程では、歯型谷部22b内に筒状部1
4の一部が隙間なく充填されるようになっているが、第
４図（ａ）に示されるように歯型谷部22bに隙間が形成
されるように成形するようにしてもよい。In the above-described forming step, the cylindrical portion 1
Although a part of 4 is filled without a gap, it may be formed so that a gap is formed in the tooth valley 22b as shown in FIG. 4 (a).
なお素材Ｗは、筒状部14が軸方向に扱かれることによ
り製品の筒状部領域が減肉して薄厚となり、一方、底板
部12では筒状部14でしごかれた材料が集まるため増肉し
て厚さが増える傾向にある。そこで第５図（ａ）符号W2
に示されるように、筒状部の付根から先端にいたる領域
の板厚t1〜t2をt1＜t2としたり、第５図（ｂ）符号W3に
示されるように、筒状部14の付根の板厚t1に対し先端の
板厚t2をt1＜t2としたカップ状素材を用いることによ
り、成形された成形品筒状部の歯形深さの均一化を図る
ことができる。In addition, the material W is reduced in thickness by thinning the cylindrical portion area of the product by the cylindrical portion 14 being handled in the axial direction, while the material squeezed by the cylindrical portion 14 in the bottom plate portion 12 is collected. There is a tendency to increase the thickness and increase the thickness. Therefore Figure 5 (a) code W 2
As shown, as indicated to the thickness t 1 ~t 2 region leading to the tip from the base of the cylindrical portion or the t 1 <t 2, in FIG. 5 (b) code W 3, cylindrical by using a cup-shaped material the thickness t 2 of the tip was t 1 <t 2 to the thickness t 1 of the base parts 14, made uniform tooth depth of the molded article tubular portion that is formed be able to.
また第５図（ｃ）符号W4に示されるように、底板部12
に予め開口部13を形成しておき、成形時の底板部12への
材料流れを開口部13が縮径することにより吸収し、底板
部12の増肉化を防止するようにしてもよい。As also shown in FIG. 5 (c) code W 4, the bottom plate portion 12
An opening 13 may be formed in advance, and the material flow to the bottom plate 12 during molding may be absorbed by reducing the diameter of the opening 13 to prevent the bottom plate 12 from being thickened.
また第５図（ｄ）符号W5に示されるように、底板部12
に予めリング状の盛り上がり部13aを形成しておけば、
成形時にこの盛り上がり部13aがさらに屈曲されること
により、底板部12の厚肉化を防止するようにしてもよ
い。As also shown in FIG. 5 (d) codes W 5, bottom plate portion 12
If the ring-shaped swell 13a is formed in advance,
The raised portion 13a may be further bent during molding to prevent the bottom plate portion 12 from being thickened.
第６図はダイ側の成形面の他の例を示しており、テー
パ面形状の素材導入面32aの扱き部32cにつながる領域32
a2を円弧形状（Ｏ点を中心とする円の一部）として、素
材の導入をさらに円滑に、また扱き時の素材間に生じる
摩擦力をさらに小さくするようにしたものである。なお
扱き部32cは勿論、Ｒ面である。FIG. 6 shows another example of the molding surface on the die side, and shows a region 32 connected to the handling portion 32c of the material introduction surface 32a having a tapered surface shape.
The a 2 as an arc shape (a part of a circle around the point O), further smoothly the introduction of the material, also is obtained so as to further reduce the frictional force generated between the material during ironing. Note that the handling portion 32c is, of course, an R surface.
また本発明方法によって成形したスプライン溝15の溝
深さは、筒状部14の付根側程深くなる。また第７図に示
されるように、カップ状素材Ｗを開口部を上方に向けて
上パンチ40の歯型42に嵌め、フローティング支持される
押え部材44によって素材底板部12をクランプし、上パン
チ40を下降させて、ダイ50のテーパ面形状の素材導入面
52aと直円筒面52b間の扱き部52cによって素材Ｗを扱
き、素材筒状部14の内周面に歯型を成形する成形方法で
は、スプライン溝の溝深さは逆に筒状部先端側程深くな
る。そこで、本発明方法によってスプライン溝を成形
後、第７図に示す成形方法で再度歯型を成形するように
すれば、スプライン溝の深さが筒状部長さ方向に均一と
なる。なお第７図に示す歯形の成形では、歯型42は第１
図に示す歯型22より深くされ、かつ素材導入面52a、扱
き部52c及び直円筒面52bからなる歯形成形面52は、第１
図に示す歯形成形面32の内径寸法よりわずかに小さくさ
れて、再度の歯型の成形ができるようになっていること
は勿論である。The groove depth of the spline groove 15 formed by the method of the present invention becomes deeper toward the root of the tubular portion 14. Further, as shown in FIG. 7, the cup-shaped material W is fitted into the tooth form 42 of the upper punch 40 with the opening part directed upward, and the material bottom plate portion 12 is clamped by the holding member 44 which is floatingly supported. 40 is lowered, and the material introduction surface of the taper surface shape of the die 50
In the forming method in which the material W is handled by the handling portion 52c between the 52a and the straight cylindrical surface 52b and the tooth is formed on the inner peripheral surface of the material tubular portion 14, the groove depth of the spline groove is reversed on the tip side of the tubular portion. Get deeper. Therefore, if the tooth mold is formed again by the forming method shown in FIG. 7 after forming the spline groove by the method of the present invention, the depth of the spline groove becomes uniform in the longitudinal direction of the cylindrical portion. In the molding of the tooth profile shown in FIG.
The tooth forming surface 52, which is made deeper than the tooth mold 22 shown in the figure and includes a material introduction surface 52a, a handle portion 52c, and a straight cylindrical surface 52b,
It is needless to say that the inner diameter of the tooth forming surface 32 shown in the figure is slightly smaller than that of the tooth forming surface 32 so that the tooth mold can be formed again.
以上の説明から明らかなように、本発明に係る底付き
インターナル歯型の成形方法によれば、素材はダイ側の
テーパ面形状素材導入部によって徐々に内側に巾寄せさ
れて扱き部に導びかれ、この扱き部によって扱かれるの
で、素材はゆっくりと塑性変形し、従って扱き部での摩
耗力が小さく、扱き部の摩耗度が少ないため金型の耐久
性が向上する。またカップ状素材の底板部をダイ側の扱
き部を越えた位置まで押し込むので、素材筒状部に筒状
部長手方向全域に均一深さの深い歯形を成形することが
できる。As is clear from the above description, according to the method of forming the internal tooth mold with the bottom according to the present invention, the material is gradually moved inward by the tapered surface material introduction portion on the die side and is guided to the handle portion. The material is slowly plastically deformed because it is handled by the handle, so that the abrasion force at the handle is small and the durability of the mold is improved since the degree of wear of the handle is small. In addition, since the bottom plate of the cup-shaped material is pushed to a position beyond the handle on the die side, a deep tooth profile having a uniform depth can be formed in the entire cylindrical portion in the longitudinal direction of the cylindrical portion.
第１図は成形装置の概要を示す断面図、第１図（ａ）は
成形される素材及び同装置によって成形された成形品の
斜視図、第２図（ａ），（ｂ）は素材の筒状部に歯型を
成形する手順を説明する説明図、第３図は扱き部によっ
て歯型が成形される様子を説明する説明図、第４図は第
１図に示す線IV−IVに沿う断面図、第４図（ａ）は同装
置によって成形された歯型成形部の他の例の部分断面
図、第５図（ａ）〜（ｄ）はそれぞれ本発明方法に使用
するカップ状素材の要部断面図、第６図はダイ側の成形
面の他の例を示す拡大断面図、第７図は他の方法による
スプライン溝の成形方法を説明する説明図、第８図は従
来の成形方法に使用する装置の概要図である。 Ｗ……カップ状素材の素材、 12……素材の底板、16……上パンチ、 20……下パンチ、 22……下パンチ外周に形成されている歯型、 22a……歯型山部、22b……歯型谷部、 30……ダイ、32……歯形成形面、 32a……テーパ面形状の素材導入面、 32b……直円筒面、32c……扱き部。FIG. 1 is a cross-sectional view showing an outline of a molding apparatus, FIG. 1 (a) is a perspective view of a material to be molded and a molded article molded by the apparatus, and FIGS. FIG. 3 is an explanatory view for explaining the procedure for forming the tooth mold on the cylindrical portion, FIG. 3 is an explanatory view for explaining the manner in which the tooth mold is formed by the handle, and FIG. 4 is a line IV-IV shown in FIG. FIG. 4 (a) is a partial sectional view of another example of the tooth mold formed by the same apparatus, and FIGS. 5 (a) to (d) are cup-shaped parts used in the method of the present invention. FIG. 6 is an enlarged sectional view showing another example of a molding surface on the die side, FIG. 7 is an explanatory view for explaining a method of forming a spline groove by another method, and FIG. FIG. 2 is a schematic view of an apparatus used for a molding method of FIG. W: cup-shaped raw material, 12: bottom plate of the material, 16: upper punch, 20: lower punch, 22: tooth pattern formed on the outer periphery of the lower punch, 22a: tooth-shaped peak, 22b: Tooth-shaped valley, 30: Die, 32: Tooth forming surface, 32a: Tapered surface material introduction surface, 32b: Straight cylindrical surface, 32c: Handle.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭61−269951（ＪＰ，Ａ) 特開 昭61−269952（ＪＰ，Ａ) 特開 平１−205841（ＪＰ，Ａ) 特開 平１−205842（ＪＰ，Ａ) 実開 平１−127639（ＪＰ，Ｕ) 実開 平１−215429（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) B21K 1/30 B21J 13/02──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-269951 (JP, A) JP-A-61-269952 (JP, A) JP-A-1-2055841 (JP, A) JP-A-1-26951 205842 (JP, A) JP-A 1-127639 (JP, U) JP-A 1-215429 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) B21K 1/30 B21J 13 / 02
Claims (1)
チの上面にカップ状の素材をその開口端を下向きにセッ
トし、素材の底板を上パンチと前記下パンチとで挟持し
つつ、カップ開口端より押込み鍛造して下パンチの外周
に設けた歯形に倣ってインターナル歯形を形成する底付
きインターナル歯形の成形方法であって、前記ダイの歯
形成形面は、開口端からゆるやかな傾斜角をもってのび
るテーパ面形状の素材導入部と、素材導入部の最小縮径
部である素材扱き部と、この扱き部から下方に真直ぐに
延びる素材馴らし部とから構成されて、素材の底板を前
記扱き部を越えた位置まで押し込むことを特徴とする底
付きインターナル歯形の成形方法。1. A cup-shaped material is set on the upper surface of a lower punch floatingly supported in a die, with its open end facing downward, and a bottom plate of the material is sandwiched between the upper punch and the lower punch, while the cup-opening end is held. A method of forming a bottomed internal tooth profile that forms an internal tooth profile following the tooth profile provided on the outer periphery of the lower punch by further forging and forging, wherein the tooth forming surface of the die has a gentle inclination angle from the opening end. A material introduction portion having a tapered surface shape extending, a material handling portion that is the smallest diameter portion of the material introduction portion, and a material conditioning portion that extends straight downward from the handling portion, and the bottom plate of the material is handled by the handling portion. A method of forming a bottomed internal tooth profile, wherein the internal tooth profile is pushed into a position beyond the center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22025989A JP2774596B2 (en) | 1989-08-29 | 1989-08-29 | Method of forming internal tooth profile with bottom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22025989A JP2774596B2 (en) | 1989-08-29 | 1989-08-29 | Method of forming internal tooth profile with bottom |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0386347A JPH0386347A (en) | 1991-04-11 |
| JP2774596B2 true JP2774596B2 (en) | 1998-07-09 |
Family
ID=16748381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22025989A Expired - Lifetime JP2774596B2 (en) | 1989-08-29 | 1989-08-29 | Method of forming internal tooth profile with bottom |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2774596B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0811264B2 (en) * | 1991-05-17 | 1996-02-07 | 株式会社ゴーシュー | Internal gear forming method |
-
1989
- 1989-08-29 JP JP22025989A patent/JP2774596B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0386347A (en) | 1991-04-11 |
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