JPH0833940A - Cold heading tool - Google Patents

Cold heading tool

Info

Publication number
JPH0833940A
JPH0833940A JP17100294A JP17100294A JPH0833940A JP H0833940 A JPH0833940 A JP H0833940A JP 17100294 A JP17100294 A JP 17100294A JP 17100294 A JP17100294 A JP 17100294A JP H0833940 A JPH0833940 A JP H0833940A
Authority
JP
Japan
Prior art keywords
ejector pin
hole
axial center
pin
end side
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
Application number
JP17100294A
Other languages
Japanese (ja)
Inventor
Nobutaka Funahashi
宜孝 舟橋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MITSUTOYO KIKO KK
Original Assignee
MITSUTOYO KIKO KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MITSUTOYO KIKO KK filed Critical MITSUTOYO KIKO KK
Priority to JP17100294A priority Critical patent/JPH0833940A/en
Publication of JPH0833940A publication Critical patent/JPH0833940A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To provide a cold heading tool capable of suppressing the wear and damages of an ejector pin or its peripheral part and enabling the continuous use for a long time with an inexpensive and simple constitution. CONSTITUTION:A cold heading tool 1 is provided with a cemented carbide die 3 where a forming hole 3a which is made to the shape of a bolt shaft, and a through hole 3b which is communicated with the forming hole 3a and is through in the axial direction, a die case 5 in which the cemented carbide 3 is fitted, and an ejector pin 7 which is slidably inserted in the through hole 3b. The ejector pin 7 is of the projecting shape where the tip surface 7a is projected out of the peripheral margin at the axial center, and a tapered projecting part 7b where the axial center position is projected is formed on the rear end side. An intermediate pin 13 which is slidably supported in the axial direction by a liner 11 is abutted on the rear end side of the ejector pin 7. A tapered recessed part 13a where the projecting part 7b on the rear end side of the ejector pin 7 is fitted with its axial center being aligned therewith is formed at the axial center position on the tip side of the intermediate pin 13.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、機械要素ブランクを冷
間圧造する際に用いられる冷間圧造工具に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold forging tool used for cold forging a machine element blank.

【0002】[0002]

【従来の技術】従来より、ボルトやナット等といった機
械要素のブランク(以下、「機械要素ブランク」とい
う)は、冷間圧造工具を用いて冷間圧造されている。こ
の冷間圧造工具は、機械要素ブランクの形状にくり抜か
れた成形孔と、その成形孔に連通して軸方向へ貫通する
貫通孔と、その貫通孔に挿入されたエジェクターピンと
を備え、金属素材をパンチするときには、エジェクター
ピンの先端面が成形孔の壁面の一部を形成し、成形後
は、エジェクターピンが軸方向へ摺動して成形孔内の機
械要素ブランクを押し出す様に構成されている。
2. Description of the Related Art Conventionally, blanks of machine elements such as bolts and nuts (hereinafter referred to as "machine element blanks") have been cold headed using a cold heading tool. This cold forging tool is provided with a forming hole that is hollowed out in the shape of a machine element blank, a through hole that communicates with the forming hole and penetrates in the axial direction, and an ejector pin that is inserted into the through hole. When punching, the tip surface of the ejector pin forms a part of the wall surface of the forming hole, and after forming, the ejector pin slides in the axial direction to push out the machine element blank in the forming hole. There is.

【0003】[0003]

【発明が解決しようとする課題】ところで、エジェクタ
ーピンは、機械要素ブランクを押し出す際に、中間ピン
等を介してノックアウト機構によって強打され、機械要
素ブランクと中間ピンとに挟まれて両端から荷重を受け
る。ここで、エジェクターピンの配置位置や端面形状が
理想的であれば、エジェクターピンの端面には、面全体
に対して均一に軸方向の荷重がかかる。
By the way, when ejecting a machine element blank, the ejector pin is struck by a knockout mechanism via an intermediate pin or the like, is sandwiched between the machine element blank and the intermediate pin, and receives a load from both ends. . Here, if the arrangement position and the end face shape of the ejector pin are ideal, the end face of the ejector pin is uniformly loaded in the axial direction with respect to the entire face.

【0004】しかし、実際には、エジェクターピンの配
置位置や端面形状には僅かな許容誤差があり、端面の偏
った位置に荷重がかかる(以下、偏荷重がかかるとい
う)場合が多い。この様な偏荷重がかかった状態では、
エジェクターピンに剪断力が作用するため、エジェクタ
ーピンが傾いたり歪んだりした状態で貫通孔に押し込ま
れ、エジェクターピンと貫通孔との間の摩擦抵抗が増大
する等して、エジェクターピン自体やその周辺部分にお
ける摩耗あるいは損傷が激しくなる。
However, in practice, there are slight tolerances in the disposition position of the ejector pin and the shape of the end face, and in many cases the load is applied to the position where the end face is biased (hereinafter, the bias load is applied). With such an unbalanced load applied,
Since a shearing force acts on the ejector pin, the ejector pin is pushed into the through hole in a tilted or distorted state, increasing the frictional resistance between the ejector pin and the through hole. Wear or damage on the machine becomes severe.

【0005】そのため、エジェクターピン等の部品を頻
繁に交換せざるを得ず、交換部品にかかるコストの上昇
を招き、また、圧造機の連続運転ができなくなり、機械
要素ブランクの生産効率が低下する原因にもなってい
た。そこで、本発明は、安価で簡易な構成で、エジェク
ターピンやその周辺部分の摩耗や損傷を抑制し、長時間
の連続使用を可能とした冷間圧造工具を提供することを
目的とする。
Therefore, parts such as ejector pins have to be replaced frequently, resulting in an increase in the cost of the replacement parts. Further, the continuous operation of the forging machine cannot be performed, and the production efficiency of machine element blanks decreases. It was also the cause. Therefore, an object of the present invention is to provide a cold heading tool which is inexpensive and has a simple structure, which suppresses wear and damage of the ejector pin and its peripheral portion and enables continuous use for a long time.

【0006】[0006]

【課題を解決するための手段】上述した目的を達成する
ため、本発明は、請求項1記載の通り、機械要素ブラン
クの形状にくり抜かれた成形孔と、該成形孔に連通して
軸方向へ貫通する貫通孔と、該貫通孔に挿入され、先端
面が前記成形孔の壁面の一部を形成すると共に、軸方向
へ摺動して前記成形孔内で冷間圧造された機械要素ブラ
ンクを押し出すエジェクターピンとを備えた冷間圧造工
具において、前記エジェクターピンの先端面を、周縁よ
りも軸心で突出する形状にしたことを特徴とする。
In order to achieve the above-mentioned object, the present invention provides, as claimed in claim 1, a forming hole hollowed in the shape of a machine element blank and an axial direction communicating with the forming hole. And a machine element blank that is inserted into the through hole and has a tip end surface that forms a part of the wall surface of the forming hole and that slides in the axial direction and is cold forged in the forming hole. In the cold forging tool including an ejector pin for pushing out, the tip end surface of the ejector pin is shaped so as to protrude from the peripheral edge at the axial center.

【0007】また、請求項2記載の通り、機械要素ブラ
ンクの形状にくり抜かれた成形孔と、該成形孔に連通し
て軸方向へ貫通する貫通孔と、該貫通孔に挿入され、先
端面が前記成形孔の壁面の一部を形成すると共に、軸方
向へ摺動して前記成形孔内で冷間圧造された機械要素ブ
ランクを押し出すエジェクターピンとを備えた冷間圧造
工具において、先端側で前記エジェクターピンの後端側
に当接して、該エジェクターピンを軸方向へ押し出す中
間ピンを有し、前記エジェクターピンの後端側には、軸
心位置を突出させた凸部を形成すると共に、前記中間ピ
ンの先端側の軸心位置には、前記凸部がその軸心を一致
させて嵌まり込む凹部を形成したことを特徴とする。
According to a second aspect of the present invention, a forming hole that is hollowed out in the shape of a machine element blank, a through hole that communicates with the forming hole and penetrates in the axial direction, and is inserted into the through hole and has a tip surface. While forming a part of the wall surface of the forming hole, in the cold forging tool provided with an ejector pin that slides in the axial direction and pushes out the machine element blank that has been cold forged in the forming hole, at the tip side. It has an intermediate pin that abuts on the rear end side of the ejector pin and pushes out the ejector pin in the axial direction, and on the rear end side of the ejector pin, while forming a convex portion whose axial center position is projected, At the axial center position on the tip end side of the intermediate pin, a concave portion is formed in which the convex portion fits with its axial center aligned.

【0008】更に、請求項3記載の通り、請求項2記載
の冷間圧造工具において、前記エジェクターピンの先端
面を、周縁よりも軸心で突出する形状にしたことを特徴
とする。
Further, as described in claim 3, in the cold forging tool according to claim 2, the tip end surface of the ejector pin is shaped so as to protrude from the peripheral edge at the axial center.

【0009】[0009]

【作用】本発明の請求項1記載の冷間圧造工具によれ
ば、エジェクターピンの先端面、即ち、成形孔内の機械
要素ブランクに当接する面は、周縁よりも軸心で突出す
る形状にしてある。そのため、機械要素ブランクを押し
出す際には、先端面内でも特に軸心位置に荷重が集中し
やすく、エジェクターピンを傾けたり歪ませたりする様
な剪断力が生じにくい。
According to the cold forging tool according to the first aspect of the present invention, the tip end surface of the ejector pin, that is, the surface of the ejector pin that abuts the machine element blank in the forming hole is formed in a shape projecting more axially than the peripheral edge. There is. Therefore, when the mechanical element blank is extruded, the load is likely to concentrate particularly on the axial center position even within the tip end face, and shearing force that tilts or distorts the ejector pin is unlikely to occur.

【0010】また、請求項2記載の冷間圧造工具によれ
ば、エジェクターピン後端側には軸心で突出する凸部が
形成されている。そのため、機械要素ブランクを押し出
す際には、エジェクターピンの後端側でも特に軸心位置
に荷重が集中しやすく、エジェクターピンを傾けたり歪
ませたりする様な剪断力が生じにくい。また、上記凸部
が中間ピン先端側の凹部に軸心を一致させて嵌まり込む
ので、貫通孔の長さを従来ほど長くしなくてもエジェク
ターピンの心出しができ、エジェクターピンを正確に軸
心位置に支持でき、しかも、貫通孔の加工が容易にな
る。更に、貫通孔の長さを従来ほど長くしなくても良い
ので、その分エジェクターピン自体の長さも短くでき、
エジェクターピンがより歪みにくくなり、しかも、エジ
ェクターピン自体の加工が容易になる。
Further, according to the cold forging tool of the second aspect, a convex portion protruding at the axial center is formed on the rear end side of the ejector pin. Therefore, when the mechanical element blank is pushed out, the load is likely to be concentrated particularly on the axial center position even on the rear end side of the ejector pin, and shearing force that tilts or distorts the ejector pin is unlikely to occur. Further, since the convex portion fits into the concave portion on the tip end side of the intermediate pin with the axial center aligned, the ejector pin can be centered without making the length of the through hole longer than in the conventional case, and the ejector pin can be accurately attached. It can be supported at the axial center position, and the through hole can be easily processed. Furthermore, since the length of the through hole does not have to be made longer than in the past, the length of the ejector pin itself can be shortened accordingly.
The ejector pin is less likely to be distorted, and the ejector pin itself can be easily processed.

【0011】特に、請求項3記載の通り構成すれば、機
械要素ブランクを押し出す際には、先端の軸心と後端の
軸心とで荷重を受けることになり、エジェクターピンを
傾けたり歪ませたりする様な剪断力がきわめて生じにく
い。
In particular, according to the third aspect, when the mechanical element blank is pushed out, the load is applied between the axial center of the front end and the axial center of the rear end, and the ejector pin is tilted or distorted. Very unlikely to generate shearing force.

【0012】[0012]

【実施例】次に、本発明の実施例を図面に基づいて説明
する。冷間圧造工具1は、図1に示す通り、ボルト軸の
形状にくり抜かれ、荒押し加工済みのボルトブランクB
が挿入される成形孔3a,及び成形孔3aに連通して軸
方向へ貫通する貫通孔3bが形成された超硬ダイス3
と、超硬ダイス3が嵌入されたダイスケース5と、貫通
孔3bに摺動可能に挿入されたエジェクターピン7とを
備えている。
Embodiments of the present invention will now be described with reference to the drawings. As shown in FIG. 1, the cold forging tool 1 is a bolt blank B that is hollowed into the shape of a bolt shaft and has been rough pressed.
A cemented carbide die 3 having a molding hole 3a into which a hole is inserted and a through hole 3b communicating with the molding hole 3a and penetrating in the axial direction.
And a die case 5 into which the cemented carbide die 3 is fitted, and an ejector pin 7 slidably inserted into the through hole 3b.

【0013】エジェクターピン7は、図2に示す通り、
その先端面7aが、周縁よりも軸心で突出する凸面形状
にされている。この先端面7aは、実施例では、軸心を
頂点とし、頂点のテーパ角度αが約160゜〜180゜
の範囲に含まれる円錐面にされている。また、エジェク
ターピン7の後端側には、軸心位置を突出させたテーパ
状の凸部7bが形成されている。実施例では、エジェク
ターピン7が貫通孔3bに所定以上侵入しない様にする
ため、エジェクターピン7の後端側にはフランジ部7c
が形成され、上記凸部7bは、フランジ部7cを底面,
軸心を頂点とし、角度βが30゜をなす円錐状にされ、
更に、その頂点部分7dに丸みをつけた形状にされてい
る。
The ejector pin 7 is, as shown in FIG.
The tip surface 7a is formed in a convex shape that protrudes at the axial center from the peripheral edge. In the embodiment, the tip end surface 7a is a conical surface whose apex is the axis and the taper angle α of the apex is in the range of about 160 ° to 180 °. Further, on the rear end side of the ejector pin 7, a tapered convex portion 7b whose axial center position is projected is formed. In the embodiment, in order to prevent the ejector pin 7 from entering the through hole 3b more than a predetermined amount, the flange portion 7c is provided on the rear end side of the ejector pin 7.
Is formed on the bottom surface of the flange portion 7c,
It has a conical shape with the axis at the apex and the angle β of 30 °.
Further, the vertex portion 7d has a rounded shape.

【0014】エジェクターピン7の後端側には、図1に
示した通り、ライナー11によって軸方向へ摺動可能に
支持された中間ピン13が当接する。この中間ピン13
の先端側の軸心位置には、エジェクターピン7後端側の
凸部7bが、その軸心を一致させて嵌まり込むテーパ状
の凹部13aを形成してある。この凹部13aは、図3
に示す通り、実施例では、角度γが30゜をなす円錐状
とし、開口部の直径D2を、上記凸部7bの直径D1
(図2参照)よりも1.2mm大きくして、凸部7bが
凹部13aに完全に嵌まり込む様にしてある。なお、中
間ピン13の軸心には、エアやオイル等を逃がすため、
直径D3を上記直径D1の1/2にした貫通孔13bを
形成してある。
As shown in FIG. 1, the rear end side of the ejector pin 7 is in contact with the intermediate pin 13 which is axially slidably supported by the liner 11. This intermediate pin 13
At the axial center position on the front end side, a convex portion 7b on the rear end side of the ejector pin 7 is formed with a tapered concave portion 13a into which the axial center is fitted and fitted. This recess 13a is shown in FIG.
As shown in FIG. 5, in the embodiment, the conical shape having an angle γ of 30 ° is used, and the diameter D2 of the opening is set to the diameter D1 of the convex portion 7b.
It is made 1.2 mm larger than (see FIG. 2) so that the convex portion 7b fits completely into the concave portion 13a. In addition, since air, oil, and the like escape to the axial center of the intermediate pin 13,
A through hole 13b is formed by reducing the diameter D3 to half the diameter D1.

【0015】以上のような構成において、エジェクター
ピン7は、図1に示した通り、貫通孔3bを閉塞して、
先端面7aが成形孔3aの壁面の一部を形成し、この成
形孔3aの内部に荒押し加工済みボルトブランクBのボ
ルト軸が挿入される。そして、この状態でパンチ21が
ボルト頭を圧造成形する。また、ボルト頭を圧造成形し
た後は、中間ピン13が、図示しないノックアウト機構
に叩打されて図示矢印A方向に摺動し、図4に示すよう
に、エジェクターピン7が軸方向へ摺動して、ボルトブ
ランクBを成形孔3aの外へ押し出す。
In the above structure, the ejector pin 7 closes the through hole 3b as shown in FIG.
The tip surface 7a forms a part of the wall surface of the forming hole 3a, and the bolt shaft of the rough-pressed bolt blank B is inserted into the forming hole 3a. Then, in this state, the punch 21 press-forms the bolt head. After the head of the bolt is press-formed, the intermediate pin 13 is struck by a knockout mechanism (not shown) and slides in the direction of arrow A in the drawing, and as shown in FIG. 4, the ejector pin 7 slides in the axial direction. Then, the bolt blank B is pushed out of the forming hole 3a.

【0016】この時、エジェクターピン7は、ボルトブ
ランクBと中間ピン13とに挟まれて両端から荷重を受
ける。ボルトブランクBに当接する先端面7aは、軸心
が突出する凸面になっているので、特に軸心に荷重が集
中する。一方、エジェクターピン7後端側の凸部7bも
軸心が突出し、中間ピン13の凹部13aにぴったりと
嵌まっているので、特に軸心に荷重が集中する。したが
って、エジェクターピン7は、両端それぞれの軸心で荷
重を受けることになる。この様に、エジェクターピン7
には偏荷重がかからないので、エジェクターピン7を傾
けたり歪ませたりする様な剪断力がきわめて生じにく
い。
At this time, the ejector pin 7 is sandwiched between the bolt blank B and the intermediate pin 13 and receives a load from both ends. Since the tip end surface 7a that abuts the bolt blank B is a convex surface from which the shaft center projects, the load is concentrated especially on the shaft center. On the other hand, the convex portion 7b on the rear end side of the ejector pin 7 also has the axial center protruding and is fitted into the concave portion 13a of the intermediate pin 13, so that the load is particularly concentrated on the axial center. Therefore, the ejector pin 7 receives a load at each axial center of both ends. In this way, ejector pin 7
Since an unbalanced load is not applied to, the shearing force that tilts or distorts the ejector pin 7 is extremely unlikely to occur.

【0017】また、凸部7bが中間ピン13の凹部13
aに軸心を一致させて嵌まり込むので、貫通孔3bの長
さを従来ほど長くしなくてもエジェクターピン7の心出
しができ、エジェクターピン7を正確に軸心位置に支持
できる。したがって、エジェクターピン7を、貫通孔3
b内で従来以上にスムーズに摺動させることができ、エ
ジェクターピン7や貫通孔3bの摩耗が抑制される。
The convex portion 7b is the concave portion 13 of the intermediate pin 13.
Since the shaft center is fitted in a and fitted, the ejector pin 7 can be centered and the ejector pin 7 can be accurately supported at the shaft center position without making the length of the through hole 3b longer than in the conventional case. Therefore, the ejector pin 7 is connected to the through hole 3
It can slide more smoothly than before in b, and wear of the ejector pin 7 and the through hole 3b is suppressed.

【0018】更に、エジェクターピン7については、貫
通孔3bの長さを従来ほど長くしなくても良い分、エジ
ェクターピン7自体の長さも短くできるので、エジェク
ターピン7がより歪みにくくなり、摩耗や損傷などが防
止される。これらの結果、エジェクターピン7等の部品
を、従来に比べて頻繁に交換しなくても良くなるので、
交換部品にかかるコストを低減でき、また、部品交換に
よって圧造機の連続運転を妨げるといったことがないの
で、ボルトブランクの生産効率が向上する。
Further, as for the ejector pin 7, the length of the through hole 3b does not have to be made longer than in the conventional case, so that the length of the ejector pin 7 itself can be shortened. Damage is prevented. As a result, parts such as the ejector pin 7 do not have to be replaced more frequently than in the conventional case.
The cost of replacement parts can be reduced, and since the replacement of parts does not hinder the continuous operation of the forging machine, the production efficiency of bolt blanks is improved.

【0019】更に、エジェクターピン7を短くできるの
で、エジェクターピン7自体の加工が容易になり、精度
良く形成すべき貫通孔3bも短くなるので、超硬ダイス
3についても加工が容易になる。したがって、冷間圧造
工具1自体の製造にかかるコストも低減される。
Furthermore, since the ejector pin 7 can be shortened, the ejector pin 7 itself can be easily processed, and the through hole 3b to be formed with high precision can be shortened, so that the cemented carbide die 3 can be easily processed. Therefore, the cost for manufacturing the cold heading tool 1 itself is also reduced.

【0020】以上、本発明の実施例を説明したが、本発
明はこれに限定されず、本発明の要旨を逸脱しない範囲
内の種々なる態様を採用することができる。例えば、実
施例では、成形孔3a内には、ボルト軸が挿入されてい
たが、成形孔3aがボルト頭を成形する形状をなす場
合、ナットを成形する形状をなす場合等にも、本発明の
構成を採用することができる。
Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various embodiments can be adopted without departing from the scope of the present invention. For example, in the embodiment, the bolt shaft is inserted into the molding hole 3a, but the present invention is also applicable to the case where the molding hole 3a has a shape for molding a bolt head, a shape for molding a nut, and the like. The configuration of can be adopted.

【0021】また、実施例では、エジェクターピン7の
先端面7aを円錐面としたが、軸心位置で突出していれ
ば、円錐面以外の形状(例えば、球面等)であってもよ
い。更に、実施例では、凸部7b,凹部13aをぴった
りと嵌まる円錐状にしたが、凸部が凹部に嵌まり込んで
エジェクターピン7の心出しができれば、円錐状以外の
形状(例えば、角錐状等)であってもよい。
In the embodiment, the tip surface 7a of the ejector pin 7 is a conical surface, but it may have a shape other than the conical surface (for example, a spherical surface) as long as it projects at the axial center position. Furthermore, in the embodiment, the convex portion 7b and the concave portion 13a are formed into a conical shape that fits snugly, but if the convex portion fits into the concave portion and the ejector pin 7 can be centered, a shape other than the conical shape (for example, a pyramid) can be used. Shape).

【0022】[0022]

【発明の効果】以上説明した通り、本発明の請求項1記
載の冷間圧造工具によれば、機械要素ブランクを押し出
す際、エジェクターピンには、エジェクターピンを傾け
たり歪ませたりする様な剪断力が生じにくいので、エジ
ェクターピンが貫通孔内をスムーズに摺動し、エジェク
ターピンの摩耗や損傷が抑制される。
As described above, according to the cold forging tool according to the first aspect of the present invention, when the machine element blank is extruded, the ejector pin is sheared so as to tilt or distort the ejector pin. Since force is less likely to be generated, the ejector pin slides smoothly in the through hole, and wear and damage of the ejector pin is suppressed.

【0023】また、請求項2記載の冷間圧造工具によれ
ば、機械要素ブランクを押し出す際、エジェクターピン
を傾けたり歪ませたりする様な剪断力が生じにくく、し
かも、貫通孔の長さを従来ほど長くしなくても、エジェ
クターピンを正確に軸心位置に支持できるので、エジェ
クターピンが貫通孔内をスムーズに摺動し、エジェクタ
ーピンの摩耗や損傷が抑制される。また、貫通孔の長さ
を従来ほど長くしなくても良い分、エジェクターピン自
体の長さも短くでき、エジェクターピンがより歪みにく
くなる上に、貫通孔やエジェクターピン自体の加工も容
易で、加工コストを低減できる。
According to the cold forging tool of the second aspect, when the machine element blank is extruded, a shearing force that tilts or distorts the ejector pin is unlikely to occur, and the length of the through hole is reduced. Since the ejector pin can be accurately supported at the axial center position without making it longer than before, the ejector pin smoothly slides in the through hole, and wear and damage of the ejector pin are suppressed. In addition, the length of the through hole does not have to be longer than in the past, the length of the ejector pin itself can be shortened, the ejector pin becomes less likely to be distorted, and the through hole and the ejector pin itself can be easily processed. Cost can be reduced.

【0024】更に、請求項3記載の冷間圧造工具によれ
ば、機械要素ブランクを押し出す際に、エジェクターピ
ンを傾けたり歪ませたりする様な剪断力がきわめて生じ
にくくいので、エジェクターピンの摩耗や損傷を抑制す
る効果が高い。
Further, according to the cold forging tool of the third aspect, when the machine element blank is extruded, a shearing force that tilts or distorts the ejector pin is extremely unlikely to occur, so that the ejector pin is worn. It is highly effective in suppressing damage.

【図面の簡単な説明】[Brief description of drawings]

【図1】 実施例としての冷間圧造工具を示す断面図で
ある。
FIG. 1 is a cross-sectional view showing a cold heading tool as an example.

【図2】 実施例のエジェクターピンを示す拡大正面図
である。
FIG. 2 is an enlarged front view showing the ejector pin of the embodiment.

【図3】 実施例の中間ピンの要部を示す拡大断面図で
ある。
FIG. 3 is an enlarged cross-sectional view showing the main parts of the intermediate pin of the embodiment.

【図4】 実施例の冷間圧造工具においてボルトブラン
クを押し出した状態を示す断面図である。
FIG. 4 is a cross-sectional view showing a state in which a bolt blank is extruded in the cold heading tool of the embodiment.

【符号の説明】[Explanation of symbols]

1・・・冷間圧造工具、3・・・超硬ダイス、3a・・
・成形孔、3b・・・貫通孔、5・・・ダイスケース、
7・・・エジェクターピン、7a・・・先端面、7b・
・・凸部、7c・・・フランジ部、11・・・ライナ
ー、13・・・中間ピン、13a・・・凹部、13b・
・・貫通孔、21・・・パンチ。
1 ... Cold forging tool, 3 ... Carbide die, 3a ...
・ Molding hole, 3b ... Through hole, 5 ... Die case,
7 ... Ejector pin, 7a ... Tip surface, 7b.
..Convex portion, 7c ... Flange portion, 11 ... Liner, 13 ... Intermediate pin, 13a ... Recessed portion, 13b
..Punching through holes, 21 ...

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 機械要素ブランクの形状にくり抜かれた
成形孔と、該成形孔に連通して軸方向へ貫通する貫通孔
と、該貫通孔に挿入され、先端面が前記成形孔の壁面の
一部を形成すると共に、軸方向へ摺動して前記成形孔内
で冷間圧造された機械要素ブランクを押し出すエジェク
ターピンとを備えた冷間圧造工具において、 前記エジェクターピンの先端面を、周縁よりも軸心で突
出する形状にしたことを特徴とする冷間圧造工具。
1. A molding hole that is hollowed out in the shape of a machine element blank, a through hole that communicates with the molding hole and penetrates in the axial direction, and a front end surface of a wall surface of the molding hole that is inserted into the through hole. In a cold forging tool comprising an ejector pin that forms a part and slides in the axial direction to push out a machine element blank that has been cold forged in the forming hole, wherein the tip surface of the ejector pin is A cold forging tool characterized in that it also has a shape that protrudes at the axial center.
【請求項2】 機械要素ブランクの形状にくり抜かれた
成形孔と、該成形孔に連通して軸方向へ貫通する貫通孔
と、該貫通孔に挿入され、先端面が前記成形孔の壁面の
一部を形成すると共に、軸方向へ摺動して前記成形孔内
で冷間圧造された機械要素ブランクを押し出すエジェク
ターピンとを備えた冷間圧造工具において、 先端側で前記エジェクターピンの後端側に当接して、該
エジェクターピンを軸方向へ押し出す中間ピンを有し、 前記エジェクターピンの後端側には、軸心位置を突出さ
せた凸部を形成すると共に、前記中間ピンの先端側の軸
心位置には、前記凸部がその軸心を一致させて嵌まり込
む凹部を形成したことを特徴とする冷間圧造工具。
2. A molding hole which is hollowed out in the shape of a machine element blank, a through hole which communicates with the molding hole and penetrates in the axial direction, and a front end face of a wall surface of the molding hole which is inserted into the through hole. A cold forging tool, which forms a part and ejects a cold-forged machine element blank that slides in the axial direction in the axial direction, and a cold forging tool, wherein the tip end side is the rear end side of the ejector pin Has an intermediate pin that pushes out the ejector pin in the axial direction, and at the rear end side of the ejector pin, a convex portion whose axial center position is projected is formed, and at the end side of the intermediate pin. A cold heading tool, characterized in that at the axial position, a concave portion is formed in which the convex portion fits with the axial center thereof aligned.
【請求項3】 請求項2記載の冷間圧造工具において、 前記エジェクターピンの先端面を、周縁よりも軸心で突
出する形状にしたことを特徴とする冷間圧造工具。
3. The cold forging tool according to claim 2, wherein the tip surface of the ejector pin is shaped so as to protrude from the peripheral edge at the axial center.
JP17100294A 1994-07-22 1994-07-22 Cold heading tool Pending JPH0833940A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17100294A JPH0833940A (en) 1994-07-22 1994-07-22 Cold heading tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17100294A JPH0833940A (en) 1994-07-22 1994-07-22 Cold heading tool

Publications (1)

Publication Number Publication Date
JPH0833940A true JPH0833940A (en) 1996-02-06

Family

ID=15915291

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17100294A Pending JPH0833940A (en) 1994-07-22 1994-07-22 Cold heading tool

Country Status (1)

Country Link
JP (1) JPH0833940A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101885032A (en) * 2010-07-15 2010-11-17 宏茂五金(昆山)有限公司 Novel red fighting screw mould
CN103302163A (en) * 2013-06-21 2013-09-18 安徽华东光电技术研究所 Integrated forming methods of wave guide transformation coupler inner cavity and coupler and forming tool of wave guide transformation coupler inner cavity
CN104139148A (en) * 2014-07-15 2014-11-12 广州小出钢管有限公司 Cold heading opening and closing die of automobile double-flange special-shaped work piece
CN105834239A (en) * 2016-05-18 2016-08-10 镇江市隆盛工具有限公司 Ejector rod sleeve
CN107812873A (en) * 2017-11-29 2018-03-20 胡瑾 A kind of cold headers protect guide pin bushing with thimble
CN108723275A (en) * 2018-07-24 2018-11-02 浙江裕泰汽车配件有限公司 Eccentric bolt Combined mold for processing
CN114054660A (en) * 2021-11-15 2022-02-18 河南航天精工制造有限公司 Combined die for cold heading cap rod piece

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101885032A (en) * 2010-07-15 2010-11-17 宏茂五金(昆山)有限公司 Novel red fighting screw mould
CN103302163A (en) * 2013-06-21 2013-09-18 安徽华东光电技术研究所 Integrated forming methods of wave guide transformation coupler inner cavity and coupler and forming tool of wave guide transformation coupler inner cavity
CN104139148A (en) * 2014-07-15 2014-11-12 广州小出钢管有限公司 Cold heading opening and closing die of automobile double-flange special-shaped work piece
CN105834239A (en) * 2016-05-18 2016-08-10 镇江市隆盛工具有限公司 Ejector rod sleeve
CN107812873A (en) * 2017-11-29 2018-03-20 胡瑾 A kind of cold headers protect guide pin bushing with thimble
CN108723275A (en) * 2018-07-24 2018-11-02 浙江裕泰汽车配件有限公司 Eccentric bolt Combined mold for processing
CN108723275B (en) * 2018-07-24 2023-12-19 浙江裕泰汽车配件有限公司 Combined die for eccentric bolt processing
CN114054660A (en) * 2021-11-15 2022-02-18 河南航天精工制造有限公司 Combined die for cold heading cap rod piece
CN114054660B (en) * 2021-11-15 2024-05-17 河南航天精工制造有限公司 Combined die for cold heading capped rod piece

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