JPH03207545A - Manufacture of cupped product - Google Patents
Manufacture of cupped productInfo
- Publication number
- JPH03207545A JPH03207545A JP156590A JP156590A JPH03207545A JP H03207545 A JPH03207545 A JP H03207545A JP 156590 A JP156590 A JP 156590A JP 156590 A JP156590 A JP 156590A JP H03207545 A JPH03207545 A JP H03207545A
- Authority
- JP
- Japan
- Prior art keywords
- hole
- cup
- punch
- tip
- gap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000005242 forging Methods 0.000 claims description 14
- 239000002994 raw material Substances 0.000 abstract 4
- 238000007796 conventional method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Forging (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、底部から外方へ突出する軸部を有するとと
もに側壁部内側にアンダーカット部を有するカップ状製
品を製造する場合に用いて好適な製造方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is suitable for use in manufacturing a cup-shaped product that has a shaft that projects outward from the bottom and has an undercut on the inside of the side wall. It relates to a manufacturing method.
（従来の技術）
上述の如き製品としては、例えば自動車の、出力軸を一
体化したデフケースや、駆動軸を一体化した等速ジョイ
ント外輪等があり、かかる製品を製造する従来の方法と
しては、例えば第５図に示す鍛造型を用いるものがある
。(Prior Art) Examples of the above-mentioned products include, for example, automobile differential cases with integrated output shafts, constant velocity joint outer rings with integrated drive shafts, etc. Conventional methods for manufacturing such products include: For example, there is one that uses a forging die shown in FIG.
すなわちこの方法は、カップ用孔１ａおよびその孔の底
部に設けられた軸用孔１ｂを有するダイス１と、その軸
用孔１ｂ内に嵌合するノックアウトピン２と、軸用孔１
ｂの内径に近い外径の先端部３ａおよびカップ用孔ｌａ
内に嵌合し得る肩部３ｂを有するポンチ３どを具えてな
る鍛造型の、上記カップ用孔Ｉａ内に、第６図（ｄ）に
示す如き、底部４ａから外方へ突出する軸部４ｂを有す
るとともにその底部４ａから上部へ向かうにつれて半径
方向外方へ拡がる側壁部４ｃを有するカップ状に荒鍛造
或形してなる素材４を、第５図中左半部に示す如くセッ
１・シ、上記ポンチ３でその素材４をダイス１のカップ
用孔１ａおよび軸用孔１ｂ内へ押し込むことにより、カ
ップ用孔Ｌａの角部で側壁部４ｃの外周面を扱くととも
に、軸用孔ｌｂ内に軸部４ｂを充満させて、第６図（ｅ
）に示すような、軸部５ａおよびアンダーカット部５ｂ
を有するカップ状製品５を形或する、といった工程を経
るものである。That is, this method includes a die 1 having a cup hole 1a and a shaft hole 1b provided at the bottom of the hole, a knockout pin 2 that fits into the shaft hole 1b, and a shaft hole 1.
The tip 3a and the cup hole la have an outer diameter close to the inner diameter of b.
A shaft portion protruding outward from the bottom portion 4a as shown in FIG. 6(d) is inserted into the cup hole Ia of a forging die comprising a punch 3 having a shoulder portion 3b that can be fitted therein. 4b and a side wall portion 4c that expands radially outward from the bottom portion 4a toward the top. A material 4 roughly forged into a cup shape is assembled into a set 1 as shown in the left half of FIG. By pushing the material 4 into the cup hole 1a and the shaft hole 1b of the die 1 with the punch 3, the corner of the cup hole La handles the outer peripheral surface of the side wall 4c, and the shaft hole lb is filled with the shaft portion 4b, and as shown in FIG.
), the shaft portion 5a and the undercut portion 5b
The process involves forming a cup-shaped product 5 having a shape.
（発明が解決しようとする課題）
しかしながら、上記従来の方法にあっては、第６図（ｄ
）に示す素材４を形或する必要があるため、第６図（ａ
）に示す如き棒状素材６に前方押し出し鍛造を施して、
同図（ｂ）に示す如き、段部７ａを有する素材７を形威
した後、その素材７に据え込み鍛造を施して、同図（Ｃ
）に示す如き、頭部８ａを有する素材８を形威し、その
素材８の頭部８ａにさらに後方押し出し鍛造を施す、と
いう三工程からなる予備工程か必要であり、工数が嵩む
とともに鍛造型等のため設備コストが嵩むという問題が
あった。(Problem to be solved by the invention) However, in the above conventional method, FIG.
), it is necessary to shape the material 4 shown in Fig. 6 (a).
) is subjected to forward extrusion forging on a rod-shaped material 6 as shown in FIG.
After forming a material 7 having a stepped portion 7a as shown in FIG.
), a preliminary process consisting of three steps is required, in which a material 8 having a head 8a is shaped, and the head 8a of the material 8 is further backwardly extruded and forged, which increases the number of man-hours and requires a forging die. There was a problem in that equipment costs increased due to the above reasons.
この発明は、かかる課題を有利に解決した製造方法を提
供するものである。The present invention provides a manufacturing method that advantageously solves these problems.
（課題を解決するための手段）
この発明の製造方法は、底部から外方へ突出する軸部を
有するとともに側壁部内側にアンダーカッ１一部を有す
るカップ状製品を熱間鍛造にて製造するに際し、ダイス
のカップ用孔の底部に設けた軸用孔内に、その軸用孔の
底をなすノノクアウ１・ピンに一端が突き当たるととも
に他端側部分が前記軸用孔内から前記カンプ用孔内に突
出するよう、加熱された棒状素材を挿入し、前記棒状素
材の前記カップ用孔内に突出する部分を、ポンチの、前
記軸用孔よりも小径の先端部によって、その先端部の角
部と前記軸用孔の角部との間隙がその先端部と前記カッ
プ用孔の内壁面との間隙よりも小さくなるまで押し潰し
、さらに、前記ポンチの先端部と前記カップ用孔の内壁
面との間にはみ出して後方押し出しされた前記素材を、
前記ポンチの、前記カップ用札内に嵌合する肩部によっ
て所定高さに押し潰すことを特徴とするものである。(Means for Solving the Problems) The manufacturing method of the present invention includes manufacturing by hot forging a cup-shaped product having a shaft portion protruding outward from the bottom portion and having a portion of the undercup inside the side wall portion. At this time, one end abuts against the non-no-kuau 1 pin forming the bottom of the shaft hole in the shaft hole provided at the bottom of the cup hole of the die, and the other end portion extends from the shaft hole into the cup hole. A heated rod-shaped material is inserted so as to protrude inside, and the portion of the rod-shaped material protruding into the cup hole is punched at the corner of the tip using the tip of the punch, which has a smaller diameter than the shaft hole. and the corner of the shaft hole is smaller than the gap between the tip of the punch and the inner wall surface of the cup hole, and then crush the tip of the punch and the inner wall surface of the cup hole. The material that is pushed out backwards and protrudes between the
It is characterized in that the cup is crushed to a predetermined height by a shoulder portion of the punch that fits within the cup tag.
（作用）
かかる方法にあっては、ポンチをダイスのカップ用孔内
に進出させて、棒状素材の、軸用孔内から突出する部分
を、その軸用孔よりも小径のポンチ先端部で押し潰すと
、その先端部の角部と軸用孔の角部との間隙がポンチの
進行方向とは逆向きに開くことになるので、ポンチ先端
部によって押し潰された素材部分の余肉は、前記間隙か
ら斜め後方へはみ出して、カップ用孔の底部付近に充満
することなくカップ用孔の内壁面に沿って比較的滑らか
に後方押し出しされる。(Function) In this method, the punch is advanced into the cup hole of the die, and the portion of the bar-shaped material protruding from the shaft hole is pushed with the tip of the punch, which has a smaller diameter than the shaft hole. When crushed, the gap between the corner of the tip and the corner of the shaft hole will open in the opposite direction to the direction of movement of the punch, so the excess thickness of the material crushed by the punch tip will be It protrudes diagonally rearward from the gap and is pushed out relatively smoothly rearward along the inner wall surface of the cup hole without filling the vicinity of the bottom of the cup hole.
しかもここでは、前記間隙が、ポンチ先端部とカップ用
孔の内壁面との間隙すなわち通常であればカップの側壁
部肉厚となる寸法よりも小さくなるまで、前記素材を押
し潰すので、前者の間隙が減少してきて後者の間隙に等
しくなった後に前者の間隙からはみ出して後方押し出し
された素材の５
肉厚は、後者の間隙よりも小さなものとなる。Moreover, here, the material is crushed until the gap becomes smaller than the gap between the tip of the punch and the inner wall surface of the cup hole, that is, the dimension that would normally be the wall thickness of the side wall of the cup, so the former After the gap decreases and becomes equal to the latter gap, the thickness of the material that protrudes from the former gap and is pushed backward becomes smaller than the latter gap.
そして、カップ用孔の内壁面に沿って後方押し出しされ
た素材は、ボンチ肩部によって所定高さに押し潰されて
、先端が平坦なカップ状となり、その側壁部は上記の如
く肉厚がポンチ先端部とカップ用孔の内壁面との間隙よ
りも小さいことから内側にアンダーカット部を有するも
のとなる。The material pushed backward along the inner wall surface of the cup hole is crushed to a predetermined height by the punch shoulder to form a cup shape with a flat tip, and the side wall has a thickness similar to that of the punch as described above. Since the gap is smaller than the gap between the tip and the inner wall surface of the cup hole, it has an undercut portion on the inside.
この一方、ポンチ先端部はノックアウトピンとの間で、
素材の、軸用孔内の部分をも押し潰すので、その部分は
軸用孔内に充満して軸部となる。On the other hand, between the punch tip and the knockout pin,
Since the part of the material inside the shaft hole is also crushed, that part fills the shaft hole and becomes the shaft part.
しかる後、ポンチを後退させるとともにノックアウトピ
ンを進出させると、底部から外方へ突出する軸部を有す
るとともに側壁部内側にアンダーカット部を有するカッ
プ状製品が、そのノックアウトピンにより、ダイスのカ
ップ用孔および軸用孔内から押し出されて、型外へ取り
出し可能となる。After that, when the punch is retracted and the knockout pin is advanced, the cup-shaped product, which has a shaft portion protruding outward from the bottom and an undercut portion inside the side wall portion, is moved by the knockout pin into the cup shape of the die. It is extruded from the hole and the shaft hole, and can be taken out of the mold.
従って、この発明の方法によれば、頭部や、上方へ向か
うにつれて半径方向外方へ拡がるカップ状部を形或する
予備工程を経ずして直接的に、棒６
状の素材から、軸部およびアンダーカット部を有する製
品を製造することができるので、工程数を大幅に減少さ
せ得て、工数および設備コストを大幅に削滅することが
できる。Therefore, according to the method of the present invention, a shaft can be directly formed from a rod-shaped material without going through a preliminary step of forming a head or a cup-shaped portion that expands radially outward toward the top. Since it is possible to manufacture a product having a section and an undercut section, the number of steps can be significantly reduced, and the number of man-hours and equipment costs can be significantly reduced.
（実施例）
以下に、この発明の実施例を図面に基すき詳細に説明す
る。(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第１図は、この発明の製造方法の一実施例を適用した熱
間鍛造型を示す縦断面図であり、この鍛造型は構造的に
は第５図に示すものと概略同一であるので、図中第５図
と同様の部分はそれと同一の符号にて示す。FIG. 1 is a longitudinal cross-sectional view showing a hot forging die to which an embodiment of the manufacturing method of the present invention is applied, and this forging die is structurally approximately the same as that shown in FIG. In the figure, parts similar to those in FIG. 5 are designated by the same reference numerals.
すなわち、図中１はダイス、２はノックアウトピン、３
はポンチをそれぞれ示し、ダイス１ば、カップ用孔１ａ
と軸用孔１ｂとを有しており、また、ボンチ３は、先端
部３ａと肩部３ｂとを有している。That is, in the figure, 1 is a die, 2 is a knockout pin, and 3 is a die.
indicate punches, die 1b, cup hole 1a
The punch 3 has a tip portion 3a and a shoulder portion 3b.
ここで、カップ用孔ｌａ内には、そこに密に嵌め込まれ
た筒状部材によって底部が画威されており、軸用孔１ｂ
はその筒状部材に形威されている。また、ノックアウト
ピン２は、軸用孔ｌｂ内に密にかつ進退移動可能に嵌合
しており、後述する押し潰しの際には後退を阻止されて
軸用孔１ｂの底部を画或ずる。そして、肩部３ｂは、先
端部３ａとなる軸状部材の周囲に密に嵌合された筒状部
材によって形威されている。Here, the bottom of the cup hole la is defined by a cylindrical member tightly fitted therein, and the shaft hole 1b is defined by a cylindrical member tightly fitted therein.
is shaped by its cylindrical member. Further, the knockout pin 2 is tightly fitted into the shaft hole 1b so as to be able to move forward and backward, and is prevented from retreating during crushing, which will be described later, and cuts the bottom of the shaft hole 1b. The shoulder portion 3b is defined by a cylindrical member that is tightly fitted around the shaft-like member that becomes the tip portion 3a.
しかして、ここにおける鍛造型では、第１図およびその
ポンチ先端部３ａ付近を拡大した第２図に示すように、
ポンチ先端部３ａの外径をφＸ、カップ用孔１ａの内径
をφＹ（ポンチ肩部の外径も概略これに等しい。）、軸
用孔１ｂの内径をφＺとすると、φＹ，φＺは、製造す
るカップ状製品の寸法に応じて決定するが、φＸは、φ
Ｘ〈φＺなる関係を満たすように決定する。Therefore, in the forging die here, as shown in FIG. 1 and FIG. 2, which is an enlarged view of the vicinity of the punch tip 3a,
Assuming that the outer diameter of the punch tip 3a is φX, the inner diameter of the cup hole 1a is φY (the outer diameter of the punch shoulder is also approximately equal to this), and the inner diameter of the shaft hole 1b is φZ, φY and φZ are It is determined according to the dimensions of the cup-shaped product, and φX is φ
It is determined to satisfy the relationship X<φZ.
また、φＸは、アンダーカットの形或が開始されるカッ
プ用孔１ａの底部からのポンチ先端高さＳ，に対し次式
の関係にある。Further, φX has the following relationship with the height S of the punch tip from the bottom of the cup hole 1a where the undercut shape is started.
Ｓ， ＝ （１／２）■石−Ｚ ７２Ｘ） − （Ｙ−
Ｚ百一（１）これは、第２図に示すようにＤ ＝ （Ｚ
− Ｘ）／２とすると、ポンチ先端部３ａの角部３ｃと
軸用孔１ｂの角部１ｃとの間隙の大きさＬは、ポンチ先
端高さＳと上記Ｄとに対し、次式、
Ｔ．． ” ＝ Ｄ ２＋３ ２−（２）の関係にあり
、後述の如く、上記間隙からはみ出す素材の余肉の肉厚
がポンチ先端部３ａとカップ用孔１ａの内壁面との間隙
Ｔ（但し、Ｔ ＝ （Ｙ − Ｘ）／２）すなわち通常
であればカップの側壁部肉厚となる寸法よりも小さ《な
ってアンダーカットが生ずるには、そのＴよりも上記Ｌ
が小さくなる必要があるため、Ｓ−Ｓ ＋ であるアン
ダーカットの開始時点では、Ｌ＝Ｔの関係となって、（
２）式に上記ＬＤ，Ｓを代入すると、
Ｓ，”＝ ｛（Ｙ−Ｘ）／２１ ２−（（Ｚ−Ｘ）／２
１ ２となり、この式を整理すると（１）式となるから
である。S, = (1/2)■Stone-Z 72X) - (Y-
Z111 (1) This means that D = (Z
− ．． ．． ”=D 2+3 2-(2), and as described later, the thickness of the excess material protruding from the gap is the gap T between the punch tip 3a and the inner wall surface of the cup hole 1a (however, T = (Y −
needs to be small, so at the start of the undercut, which is S - S +, the relationship L = T, and (
2) Substituting the above LD, S into the formula, S,”= {(Y-X)/21 2-((Z-X)/2
1 2, and rearranging this equation results in equation (1).
従って、φＸはまた上記関係からＳＩが所定高さとなる
ように決定する。ずなわち、φＸ〈φＺの範囲内である
ことを前提として、φＸを小さめに設定すれば、アンダ
ーカット形成開始ポンチ先端高さＳ，は高めとなるがポ
ンチが排除する素材の余肉は少なめと７！ｌ！″り、こ
の結果として、高さが９
低く肉厚が厚いカップ状製品ができ、この一方、φＸを
大きめに設定すれば、アンダーカットの形威が開始され
るポンチ先端高さＳＩは低めとなるがポンチが排除する
素材の余肉は多めとなり、この結果として、高さが高く
肉厚が薄いカップ状製品ができる。Therefore, φX is also determined from the above relationship so that SI becomes a predetermined height. In other words, assuming that φX<φZ is within the range, if φX is set to a smaller value, the punch tip height S, at which undercut formation starts will be higher, but the excess material removed by the punch will be smaller. And 7! l! As a result, a cup-shaped product with a low height and a thick wall is created.On the other hand, if φX is set larger, the punch tip height SI, where the undercut starts, is lower. However, the punch removes a large amount of excess material, resulting in a cup-shaped product with a high height and thin wall thickness.
そして、上記ポンチ先端高さＳ１よりも素材の軸用孔１
ｂからの突き出し高さを高くすれば、その高い分に応じ
てカップ状製品の高さもさらに高くなるが、アンダーカ
ット部分の高さにはさほど影響がない。Then, the shaft hole 1 of the material is lower than the punch tip height S1.
If the protrusion height from b is increased, the height of the cup-shaped product will also be increased accordingly, but the height of the undercut portion will not be affected much.
かかる鍛造型を用いてここでは、以下の如くしてカップ
状製品を熱間鍛造する。Using such a forging die, a cup-shaped product is hot forged in the following manner.
すなわち先ず、第３図（ａ）に示す如き棒状素材９に予
備工程で他の鍛造型により前方押し出し鍛造を施して形
威した、同図（ｂ）に示ず如き段部］．Ｏａを有する素
材ＩＯを、熱間加工域の温度に加熱して上記軸用孔ｌｂ
内に第１図中左半部に示す如くセットし、その素材１０
の一端をノックアウトピン２に突き当てるとともに他端
側部分を軸用孔１ｂ１０
内から上記カップ用孔ｌａ内に上述の如く製品の高さに
応じて適宜に定めた所定高さだけ突出させる。That is, first, a bar-shaped material 9 as shown in FIG. 3(a) is forged by forward extrusion using another forging die in a preliminary process to form a stepped portion as shown in FIG. 3(b)]. The material IO having Oa is heated to a temperature in the hot working region to form the shaft hole lb.
Set the material 10 inside as shown in the left half of Figure 1.
One end is brought into contact with the knockout pin 2, and the other end is made to protrude from the shaft hole 1b10 into the cup hole la by a predetermined height appropriately determined according to the height of the product as described above.
次いで、第４図（ａ）〜（ｅ）に示すように、その棒状
素材１０の、カップ用孔ｌａ内に突出する部分を、その
カップ用孔１ａ内に進出させたポンチ３の先端部３ａに
よって、その先端部３ａの角部３Ｃと軸用孔１ｂの角部
１ｃとの間隙がその先端部３ａとカップ用孔１ａの内壁
面との間隙よりも小さ《なって所定の製品肉厚寸法とな
るまで押し潰し、さらに、そのボンチ３の先端部３ａと
カップ用孔１ａの内壁面との間にはみ出して後方押し出
しされた素材１０を、ポンチ３の肩部３ｂによって所定
高さに押し潰す。Next, as shown in FIGS. 4(a) to 4(e), the tip portion 3a of the punch 3 is inserted into the cup hole 1a so that the portion of the rod-shaped material 10 that protrudes into the cup hole la is inserted into the cup hole 1a. As a result, the gap between the corner 3C of the tip 3a and the corner 1c of the shaft hole 1b is smaller than the gap between the tip 3a and the inner wall surface of the cup hole 1a, resulting in a predetermined product wall thickness dimension. Then, the material 10 that has protruded between the tip 3a of the punch 3 and the inner wall surface of the cup hole 1a and is pushed out backward is crushed to a predetermined height by the shoulder 3b of the punch 3. .
上記工程にあっては、棒状素材１０の、軸用孔１ｂ内か
ら突出する部分を、その軸用孔１ｂよりも小径のポンチ
先端部３ａで押し潰すと、その先端部３ａの角部３ｃと
軸用孔１ｂの角部１ｃとの間隙がボンチ３の進行方向と
は逆向きに開くことになるので、ポンチ先端部３ａによ
って押し潰された素材１０の余肉は、前記間隙から斜め
後方へはみ出して、カップ用孔１ａの底部付近に充満す
ることなくカップ用孔１ａの内壁面に沿って比較的滑ら
かに後方押し出しされる。In the above process, when the part of the rod-shaped material 10 protruding from the shaft hole 1b is crushed with the punch tip 3a having a smaller diameter than the shaft hole 1b, the corner 3c of the tip 3a is crushed. Since the gap between the shaft hole 1b and the corner 1c opens in the opposite direction to the advancing direction of the punch 3, the excess material of the material 10 crushed by the punch tip 3a moves diagonally backward from the gap. It protrudes and is pushed out relatively smoothly rearward along the inner wall surface of the cup hole 1a without filling the vicinity of the bottom of the cup hole 1a.
しかもここでは、ポンチ先端部３ａの角部３ｃと軸用孔
１ｂの角部１ｃとの間隙が、ポンチ先端部３ａとカップ
用孔１ａの内壁面との間隙よりも小さくなるまで、素材
１０を押し潰すので、前者の間隙が減少してきて後者の
間隙に等しくなった後に前者の間隙からはみ出して後方
押し出しされた素材１０の余肉の肉厚ば、後者の間隙よ
りも小さなものとなる。Moreover, here, the material 10 is pressed until the gap between the corner 3c of the punch tip 3a and the corner 1c of the shaft hole 1b becomes smaller than the gap between the punch tip 3a and the inner wall surface of the cup hole 1a. Because of the crushing, the former gap decreases and becomes equal to the latter gap, and then the thickness of the excess material 10 that protrudes from the former gap and is pushed backward becomes smaller than the latter gap.
そして、カップ用孔１ａの内壁面に沿って後方押し出し
された素材１０は、ポンチ肩部３ｂによって所定高さに
押し潰されて、先端が平坦なカップ状となり、その側壁
部は上記の如く肉厚がポンチ先端部３ａとカップ用孔１
ａの内壁面との間隙よりも小さいことから内側にアンダ
ーカッｌ・部を有するものとなる。The material 10 pushed out backward along the inner wall surface of the cup hole 1a is crushed to a predetermined height by the punch shoulder 3b, forming a cup shape with a flat tip, and the side wall portion is thick as described above. The thickness is the punch tip 3a and the cup hole 1.
Since the gap is smaller than the gap between the hole and the inner wall surface of the hole a, it has an undercut portion on the inside.
この一方、ポンチ先端部３ａぱノックアウトピン２との
間で、素材１０の、軸用孔１ｂ内の部分をも押し潰すの
で、その部分は軸用孔１ｂ内に充満して軸部となる。On the other hand, between the punch tip 3a and the knockout pin 2, the part of the material 10 inside the shaft hole 1b is also crushed, so that part fills the shaft hole 1b and becomes a shaft.
この結果としてダイス１内には、第３図（Ｃ）に示す如
き、底部から外方へ突出する段付き軸部１１ａを有する
とともに側壁部Ｉｌｂの内側にアンダーカット部］．１
ｃを有するカップ状製品１ｌが、第１図中右半部に示す
ように形威される。As a result, the inside of the die 1 has a stepped shaft portion 11a projecting outward from the bottom and an undercut portion inside the side wall portion Ilb, as shown in FIG. 3(C). 1
A cup-shaped product 1l having the shape c is shaped as shown in the right half of FIG.
しかる後ここでは、ボンチ３を後退させるとともにノッ
クアウトピン２を進出させ、上記カップ状製品１１を、
ノックアウトピン２によりダイス１のカップ用孔１ａお
よび軸用孔１ｂ内から押し出して型外へ取り出し可能な
らしめる。Thereafter, the punch 3 is moved back and the knockout pin 2 is advanced to remove the cup-shaped product 11.
The knockout pin 2 pushes it out from the cup hole 1a and shaft hole 1b of the die 1 so that it can be taken out of the mold.
従って、この実施例の方法によれば、従来の、頭部や、
上方へ向かうにつれて半径方向外方へ拡がるカップ状部
を形或する予備工程を経ずして、直接的に棒状の素材１
０から、軸部およびアンダーカット部を有する製品１１
を製造することができるので、工程数を大幅に減少させ
得て、工数および設備コストを大幅に削減することがで
きる。Therefore, according to the method of this embodiment, the conventional head,
The rod-shaped material 1 is directly formed without going through a preliminary process of forming a cup-shaped portion that expands radially outward as it goes upward.
0 to product 11 with shank and undercut
Since the number of steps can be significantly reduced, the number of man-hours and equipment costs can be significantly reduced.
以上、図示例に基づき説明したが、この発明は上述の例
に限定されるものでなく、例えば、製品の軸部に段部が
ない場合にも適用することができ、１３
この場合には、段部の形威が不要となるため工程数をさ
らに減少させることができる。Although the above description has been made based on the illustrated examples, the present invention is not limited to the above-mentioned examples, and can be applied, for example, to cases where the shaft portion of the product does not have a stepped portion.13 In this case, Since the shape of the stepped portion is not required, the number of steps can be further reduced.
（発明の効果）
かくしてこの発明の製造方法によれば、頭部や、上方へ
向かうにつれて半径方向外方へ拡がるカップ状部を形或
する予備工程を経ずして直接的に、棒状の素材から、軸
部およびアンダーカット部を有する製品を製造すること
ができるので、工程数を大幅に減少させ得て、工数およ
び設備コストを大幅に削減することができる。(Effects of the Invention) Thus, according to the manufacturing method of the present invention, a rod-shaped material can be directly manufactured without going through a preliminary step of forming a head or a cup-shaped portion that expands radially outward as it goes upward. Since it is possible to manufacture a product having a shaft portion and an undercut portion, the number of steps can be significantly reduced, and the number of man-hours and equipment costs can be significantly reduced.
第１図はこの発明のカップ状製品の製造方法の一実施例
を適用した熱間鍛造型を左右半部で異なる作動状態にて
示す縦断面図、
第２図は上記鍛造型のポンチ先端部付近を示す拡大断面
図、
第３図（ａ）〜（Ｃ）は上記実施例の方法におけるカッ
プ状製品の製造工程を示す説明図、第４図（ａ）〜（ｅ
）は上記実施例の方法における鍛造過程を順次に示す説
明図、
１４
第５図は従来の製造方法を適用した熱間鍛造型を左右半
部で異なる作動状態にて示す縦断面図、第６図（ａ）〜
（ｅ）は従来の製造方法におけるカップ状製品の製造工
程を示す説明図である。
１−ダイス １ａ一 カップ用孔１ｂ一軸用
孔 ＩＣ一角部
２−ノックアウトピン ３−ポンチ
３ａ−先端部 ３ｂ一肩部
３ｃ一角部 １０−棒状素材１
５
特開乎
３
２０７５４５ （７）Fig. 1 is a vertical cross-sectional view showing the left and right halves of a hot forging die to which an embodiment of the method for manufacturing a cup-shaped product of the present invention is applied in different operating states, and Fig. 2 is a tip of the punch of the forging die. 3(a) to (C) are explanatory diagrams showing the manufacturing process of a cup-shaped product in the method of the above embodiment, and FIGS. 4(a) to (e) are enlarged sectional views showing the vicinity.
) are explanatory views sequentially showing the forging process in the method of the above embodiment, 14. FIG. Figure (a) ~
(e) is an explanatory diagram showing a manufacturing process of a cup-shaped product in a conventional manufacturing method. 1 - Dice 1a - Cup hole 1b Single shaft hole IC one corner 2 - Knockout pin 3 - Punch 3a - tip 3b one shoulder 3c one corner 10 - rod-shaped material 1 5 JP-A-3 207545 (7)
Claims (1)
部内側にアンダーカット部を有するカップ状製品を熱間
鍛造にて製造するに際し、 ダイスのカップ用孔の底部に設けた軸用孔内に、その軸
用孔の底をなすノックアウトピンに一端が突き当たると
ともに他端側部分が前記軸用孔内から前記カップ用孔内
に突出するよう、加熱された棒状素材を挿入し、 前記棒状素材の前記カップ用孔内に突出する部分を、ポ
ンチの、前記軸用孔よりも小径の先端部によって、その
先端部の角部と前記軸用孔の角部との間隙がその先端部
と前記カップ用孔の内壁面との間隙よりも小さくなるま
で押し潰し、 さらに、前記ポンチの先端部と前記カップ用孔の内壁面
との間にはみ出して後方押し出しされた前記素材を、前
記ポンチの、前記カップ用孔内に嵌合する肩部によって
所定高さに押し潰すことを特徴とする、カップ状製品の
製造方法。[Scope of Claims] 1. When manufacturing a cup-shaped product by hot forging, which has a shaft portion protruding outward from the bottom portion and has an undercut portion inside the side wall portion, at the bottom of the cup hole of the die. A heated rod-shaped material is placed in the provided shaft hole so that one end abuts the knockout pin forming the bottom of the shaft hole and the other end protrudes from the shaft hole into the cup hole. The portion of the rod-shaped material that protrudes into the cup hole is inserted into the cup hole, and the gap between the corner of the tip and the corner of the shaft hole is inserted using the tip of the punch, which has a smaller diameter than the shaft hole. The material is crushed until the gap becomes smaller than the gap between the tip of the punch and the inner wall of the cup hole, and the material is pushed out backwards, protruding between the tip of the punch and the inner wall of the cup hole. A method for manufacturing a cup-shaped product, characterized in that the product is crushed to a predetermined height by a shoulder portion of the punch that fits into the cup hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP156590A JPH03207545A (en) | 1990-01-10 | 1990-01-10 | Manufacture of cupped product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP156590A JPH03207545A (en) | 1990-01-10 | 1990-01-10 | Manufacture of cupped product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03207545A true JPH03207545A (en) | 1991-09-10 |
Family
ID=11505047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP156590A Pending JPH03207545A (en) | 1990-01-10 | 1990-01-10 | Manufacture of cupped product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03207545A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19581042B4 (en) * | 1994-07-21 | 2006-05-04 | Denso Corp., Kariya | Method of making a part with an undercut |
| JP2010253513A (en) * | 2009-04-27 | 2010-11-11 | Mitsubishi Electric Corp | Method for forming undercut part |
| US8151436B2 (en) | 2003-12-22 | 2012-04-10 | Honda Motor Co., Ltd. | Method of forming member, valve guide and method of forming the same, and method of forming tubular member |
| JP2014024091A (en) * | 2012-07-26 | 2014-02-06 | Nsk Ltd | Manufacturing method for bearing ring member of wheel bearing unit |
-
1990
- 1990-01-10 JP JP156590A patent/JPH03207545A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19581042B4 (en) * | 1994-07-21 | 2006-05-04 | Denso Corp., Kariya | Method of making a part with an undercut |
| US8151436B2 (en) | 2003-12-22 | 2012-04-10 | Honda Motor Co., Ltd. | Method of forming member, valve guide and method of forming the same, and method of forming tubular member |
| JP2010253513A (en) * | 2009-04-27 | 2010-11-11 | Mitsubishi Electric Corp | Method for forming undercut part |
| JP2014024091A (en) * | 2012-07-26 | 2014-02-06 | Nsk Ltd | Manufacturing method for bearing ring member of wheel bearing unit |
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