JPH09308937A - Nib for forging die - Google Patents
Nib for forging dieInfo
- Publication number
- JPH09308937A JPH09308937A JP12445896A JP12445896A JPH09308937A JP H09308937 A JPH09308937 A JP H09308937A JP 12445896 A JP12445896 A JP 12445896A JP 12445896 A JP12445896 A JP 12445896A JP H09308937 A JPH09308937 A JP H09308937A
- Authority
- JP
- Japan
- Prior art keywords
- nib
- hole
- main body
- peripheral surface
- air
- 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
Landscapes
- Forging (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ボルト、小ネジ及
びリベット等を成形するための鍛造型のニブに関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forging die nib for forming bolts, machine screws, rivets and the like.
【０００２】[0002]
【従来の技術】従来より、鍛造型は収容孔が形成された
ケースを備え、その収容孔には図５に示すニブ７１が圧
入されるようになっている。このニブ７１の本体７１ａ
は筒状に形成され、本体７１ａにはその軸線方向へ延び
る成形孔７２が設けられている。又、本体７１ａの半径
は収容孔の半径に対して０．５〜０．６％程度大径に形
成され、本体７１ａの外周面にはエア溝７３が前記本体
７１ａの軸線を含む面に沿って延びるように凹設されて
いる。このエア溝７３は複数設けられ、各エア溝７３は
図６に示すように本体７１ａに設けられたエア抜き孔７
４を介して成形孔７２に連通している。2. Description of the Related Art Conventionally, a forging die has a case having a housing hole formed therein, and a nib 71 shown in FIG. 5 is press-fitted into the housing hole. Body 71a of this nib 71
Is formed in a tubular shape, and the main body 71a is provided with a molding hole 72 extending in the axial direction thereof. The radius of the main body 71a is 0.5 to 0.6% larger than the radius of the accommodation hole, and the air groove 73 is formed on the outer peripheral surface of the main body 71a along the surface including the axis of the main body 71a. It is recessed so as to extend. A plurality of the air grooves 73 are provided, and each of the air grooves 73 is formed in the main body 71a as shown in FIG.
4 to communicate with the molding hole 72.
【０００３】上記のように構成されたニブ７１は、その
ニブ７１の軸線とケースにおける成形孔７２の軸線とが
一致するように、且つニブ７１の小径側がケースと向き
合うように位置合わせされる。この状態で、ニブ７１を
ケースへ向かって押し付けることにより、エア溝７３に
おける開口部のエッジ７３ａがケースにおける収容孔の
内周面に接触しながら、ニブ７１が収容孔へ圧入され
る。ニブ７１が収容孔へ圧入されると、収容孔の内周面
により、ニブ７１の外周面が前記ニブ７１の軸線へ向か
って押し付けられる。ニブ７１の外周面にはエア溝７３
が凹設されているため、ニブ７１における各エア溝７３
付近に応力が集中し、その応力が集中した部分はエア溝
７３に沿ってニブ７１の軸線方向へ延びる。The nib 71 configured as described above is aligned so that the axis of the nib 71 and the axis of the molding hole 72 in the case coincide with each other, and the small diameter side of the nib 71 faces the case. In this state, by pressing the nib 71 toward the case, the nib 71 is pressed into the accommodation hole while the edge 73a of the opening in the air groove 73 contacts the inner peripheral surface of the accommodation hole in the case. When the nib 71 is press-fitted into the accommodation hole, the outer peripheral surface of the nib 71 is pressed toward the axis of the nib 71 by the inner peripheral surface of the accommodation hole. An air groove 73 is formed on the outer peripheral surface of the nib 71.
The air groove 73 in the nib 71 is
The stress concentrates in the vicinity, and the part where the stress concentrates extends along the air groove 73 in the axial direction of the nib 71.
【０００４】そして、ニブ７１の成形孔７２における下
端側の開口部からはノックアウトピンが挿入され、成形
孔７２における上端側の開口部からは素材が入れられ
る。更に、成形孔７２における上端側の開口部から押圧
ピンを挿入し、その押圧ピンで成形孔７２内の素材をノ
ックアウトピン側へ押し付けると、前記素材が成形孔７
２の内面に対応した形状にされる。押圧ピンが素材をノ
ックアウトピン側へ押し付けたとき、成形孔７２内の空
気はエア抜き孔７４及びエア溝７３を介して外部へ排出
される。Then, a knockout pin is inserted from the opening on the lower end side of the molding hole 72 of the nib 71, and a material is inserted from the opening on the upper end side of the molding hole 72. Further, when a pressing pin is inserted from the opening on the upper end side of the forming hole 72 and the material in the forming hole 72 is pressed to the knockout pin side by the pressing pin, the material is formed into the forming hole 7
The shape corresponding to the inner surface of 2 is formed. When the pressing pin presses the material toward the knockout pin side, the air in the molding hole 72 is discharged to the outside through the air vent hole 74 and the air groove 73.
【０００５】[0005]
【発明が解決しようとする課題】ところが、上記ニブ７
１では、その外周面にはエア溝７３が凹設されているた
め、ニブ７１が収容孔へ圧入されて収容孔の内周面がニ
ブ７１の外周面を押し付けると、そのニブ７１における
各エア溝７３付近に応力が集中する。そして、その応力
が集中した部分は、エア溝７３に沿ってニブ７１の軸線
方向へ延びた状態になるため、前記応力が本体の周方向
へ分散しなくなってニブ７１にクラックが発生し易くな
るという問題があった。However, the above-mentioned nib 7
In No. 1, since the air groove 73 is recessed in the outer peripheral surface thereof, when the nib 71 is press-fitted into the accommodation hole and the inner peripheral surface of the accommodation hole presses the outer peripheral surface of the nib 71, each air in the nib 71 is pressed. The stress concentrates near the groove 73. Then, the stress-concentrated portion extends in the axial direction of the nib 71 along the air groove 73, so that the stress is not dispersed in the circumferential direction of the main body, and the nib 71 easily cracks. There was a problem.
【０００６】又、ニブ７１に設けられたエア溝７３がほ
ぼ前記ニブ７１の軸線方向に沿って延びているため、ニ
ブ７１をケースの収容孔へ圧入する際に、エア溝７３の
エッジ７３ａが前記収容孔の内面を引っ掻いて傷をつけ
てしまう。そして、収容孔の内面に傷がついた場合に
は、ニブ７１を交換するときに収容孔の内面を研磨して
前記傷を取り除かなければならないため、ニブ７１の交
換作業が面倒になるという問題があった。Further, since the air groove 73 provided in the nib 71 extends substantially along the axial direction of the nib 71, when the nib 71 is press-fitted into the accommodation hole of the case, the edge 73a of the air groove 73 is formed. The inner surface of the accommodation hole is scratched and scratched. If the inner surface of the accommodation hole is damaged, the inner surface of the accommodation hole must be polished to remove the damage when replacing the nib 71, which makes the replacement work of the nib 71 troublesome. was there.
【０００７】本発明は上記問題点を解決するためになさ
れたものであって、第１の目的は、本体にクラックが発
生しにくくなるようにすることにある。又、第２の目的
は、収容孔の内周面に傷がつくのを防止することにあ
る。The present invention has been made to solve the above problems, and a first object thereof is to prevent cracks from being generated in the main body. The second purpose is to prevent the inner peripheral surface of the accommodation hole from being scratched.
【０００８】更に、第３の目的は、本体の周方向に対し
偏って応力が集中するのを防止することにある。A third object is to prevent stress from being concentrated in a biased manner with respect to the circumferential direction of the main body.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成させるた
め、請求項１記載の発明では、特に、エア溝を成形孔の
軸線に沿って延びる方向以外の方向へ延びるように設け
た。In order to achieve the above object, in the invention described in claim 1, particularly, the air groove is provided so as to extend in a direction other than the direction extending along the axis of the molding hole.
【００１０】請求項２記載の発明では、前記エア溝を成
形孔の軸線に対し本体の周方向へ傾斜して延びるように
設けた。請求項３記載の発明では、請求項１又は２記載
の発明の作用に加え、前記エア溝を本体の周方向に等間
隔をおいて複数設けた。According to the second aspect of the present invention, the air groove is provided so as to extend while being inclined in the circumferential direction of the main body with respect to the axis of the molding hole. According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, a plurality of the air grooves are provided at equal intervals in the circumferential direction of the main body.
【００１１】即ち、請求項１記載の発明では、鍛造型の
ケースに設けられた収容孔にニブの本体を圧入すると、
収容孔の内周面が本体の外周面を押し付ける。本体には
エア溝が凹設されているため、その本体におけるエア溝
の近傍に応力が集中する。本体において応力が集中した
部分は、成形孔の軸線に沿って延びる方向以外の方向へ
延びるエア溝に沿った状態になる。That is, according to the first aspect of the invention, when the main body of the nib is press-fitted into the accommodation hole provided in the case of the forging die,
The inner peripheral surface of the accommodation hole presses the outer peripheral surface of the main body. Since the air groove is provided in the main body, stress concentrates near the air groove in the main body. The portion where the stress is concentrated in the main body is in a state along the air groove extending in a direction other than the direction extending along the axis of the forming hole.
【００１２】請求項２記載の発明では、請求項１記載の
発明の作用に加え、エア溝は成形孔の軸線に対し本体の
周方向へ傾斜して延びるように設けられているため、収
容孔にニブの本体を圧入するとき、エア溝のエッジは収
容孔の軸線に対して斜めになった状態で前記収容孔の内
周面に接触する。According to the second aspect of the present invention, in addition to the function of the first aspect of the invention, the air groove is provided so as to extend so as to be inclined in the circumferential direction of the main body with respect to the axis of the forming hole. When the body of the nib is press-fitted into the housing, the edge of the air groove comes into contact with the inner peripheral surface of the housing hole in a state of being inclined with respect to the axis of the housing hole.
【００１３】請求項３記載の発明では、請求項１又は２
記載の発明の作用に加え、前記エア溝は本体の周方向に
等間隔をおいて複数設けられ、その各エア溝の近傍にお
いて応力がそれぞれ集中する。According to the third aspect of the present invention, the first or second aspect is provided.
In addition to the action of the invention described above, a plurality of the air grooves are provided at equal intervals in the circumferential direction of the main body, and stress concentrates near each of the air grooves.
【００１４】[0014]
【発明の実施の形態】以下、本発明を具体化した一実施
形態を図１〜図４に従って説明する。図１に示すよう
に、鍛造型のケース１１には鉛直方向へ延びる収容孔１
２が設けられ、収容孔１２は上半部１２ａと下半部１２
ｂとから構成されている。収容孔１２における上半部１
２ａの内周面は下方から上方へ向かうほど縮径するテー
パ状に形成され、収容孔１２における下半部１２ｂは上
半部１２ａよりも大径に形成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the forging die case 11 has a housing hole 1 extending vertically.
2 are provided, and the accommodation hole 12 has an upper half 12a and a lower half 12a.
b. Upper half 1 of the accommodation hole 12
The inner peripheral surface of 2a is formed in a tapered shape in which the diameter decreases from the lower side to the upper side, and the lower half portion 12b of the accommodation hole 12 is formed to have a larger diameter than the upper half portion 12a.
【００１５】収容孔１２の上半部１２ａには、ニブ１３
が圧入されている。ニブ１３の本体１３ａは筒状に形成
され、本体１３ａにはその軸線方向へ延びる成形孔１４
が設けられている。成形孔１４は成形孔上半部１４ａと
成形孔下半部１４ｂとから構成され、成形孔上半部１４
ａは成形孔下半部１４ｂよりも若干大径に形成されてい
る。又、成形孔上半部１４ａの下端隅部は、その成形孔
上半部１４ａの内周面と底面とが滑らかに繋がるように
円弧状に形成されている。A nib 13 is provided in the upper half portion 12a of the accommodation hole 12.
Is press-fitted. A main body 13a of the nib 13 is formed in a tubular shape, and a molding hole 14 extending in the axial direction is formed in the main body 13a.
Is provided. The molding hole 14 is composed of a molding hole upper half portion 14a and a molding hole lower half portion 14b.
The diameter a is formed to be slightly larger than the lower half portion 14b of the molding hole. Further, the lower end corner portion of the molding hole upper half portion 14a is formed in an arc shape so that the inner peripheral surface and the bottom surface of the molding hole upper half portion 14a are smoothly connected.
【００１６】本体１３ａの外周面は、前記収容孔１２に
おける上半部１２ａの内周面に対応して、下方から上方
へ向かうほど縮径するテーパ状に形成されている。この
本体１３ａの半径は、上半部１２ａから抜き出した状態
において、前記上半部１２ａの半径に対し０．５〜０．
６％程度大径となっている。The outer peripheral surface of the main body 13a is formed in a tapered shape corresponding to the inner peripheral surface of the upper half portion 12a of the accommodation hole 12 and the diameter of which decreases from the lower side to the upper side. The radius of the main body 13a is 0.5 to 0. 0 with respect to the radius of the upper half portion 12a in the state of being extracted from the upper half portion 12a.
It has a diameter of about 6%.
【００１７】図２に示すように、本体１３ａの外周面に
は、成形孔１４の軸線に対し本体１３ａの周方向へ傾斜
して延びるエア溝１５が凹設されている。エア溝１５
は、本体１３ａの周方向に等間隔をおいて複数（本実施
形態では四つ）設けられている。図３に示すように、本
体１３ａには、その軸線を中心に各エア溝２７へ向かっ
て放射状に延びる複数のエア抜き孔１６が設けられてい
る。この各エア抜き孔１６により、各エア溝１５と成形
孔１４における成形孔上半部１４ａとが連通している。As shown in FIG. 2, the outer peripheral surface of the main body 13a is provided with an air groove 15 extending obliquely in the circumferential direction of the main body 13a with respect to the axis of the molding hole 14. Air groove 15
Are provided at equal intervals in the circumferential direction of the main body 13a (four in this embodiment). As shown in FIG. 3, the main body 13a is provided with a plurality of air vent holes 16 extending radially toward each air groove 27 around the axis thereof. Each of the air vents 16 communicates each air groove 15 with the upper half portion 14a of the forming hole of the forming hole 14.
【００１８】図１に示すように、収容孔１２の下半部１
２にはライナー１７が圧入されている。ライナー１７に
は、ノックアウトピン用挿通孔１８が、収容孔１２の軸
線上で延びるように設けられている。As shown in FIG. 1, the lower half portion 1 of the accommodation hole 12
A liner 17 is press-fitted to the line 2. A knockout pin insertion hole 18 is provided in the liner 17 so as to extend on the axis of the accommodation hole 12.
【００１９】次に、上記のように構成されたニブ１３の
作用を説明する。ニブ１３をケース１１の収容孔１２に
おける上半部１２ａに圧入するには、ケース１１からラ
イナー１７を取り外した状態で、ニブ１３の軸線と収容
孔１２の軸線とが一致するように前記ニブ１３を配置す
る。そして、ニブ１３は、ケース１１の下方から収容孔
１２の下半部１２ｂを介して上半部１２ａへ向かって押
し付けられる。すると、各エア溝１５のエッジ１５ａが
収容孔１２の軸線に対して斜めになった状態で前記上半
部１２ａの内周面に接触しならがら、ニブ１３が収容孔
１２の上半部１２ａへ圧入される。Next, the operation of the nib 13 constructed as above will be described. In order to press fit the nib 13 into the upper half 12a of the housing hole 12 of the case 11, the liner 17 is removed from the case 11 so that the axis of the nib 13 and the axis of the housing hole 12 coincide with each other. To place. Then, the nib 13 is pressed from below the case 11 toward the upper half 12a through the lower half 12b of the housing hole 12. Then, while the edge 15a of each air groove 15 is in contact with the inner peripheral surface of the upper half portion 12a in a state of being inclined with respect to the axis of the accommodation hole 12, the nib 13 causes the upper half portion 12a of the accommodation hole 12 to move. Is pressed into.
【００２０】ニブ１３が上半部１２ａへ圧入されると、
上半部１２ａの内周面によりニブ１３の本体１３ａにお
ける外周面が、前記本体１３ａの軸線へ向かって押し付
けられる。本体１３ａの外周面にはエア溝１５が凹設さ
れているため、ニブ１３における各エア溝１５付近に応
力が集中し、その応力が集中した部分は、図４に示すエ
ア溝１５に沿って成形孔１４の軸線に対し本体１３ａの
周方向へ傾斜して延びた状態になる。又、この応力集中
は、本体１３ａの周方向に等間隔をおいて設けられた複
数のエア溝１４の近傍でそれぞれ起きる。When the nib 13 is pressed into the upper half 12a,
The outer peripheral surface of the main body 13a of the nib 13 is pressed by the inner peripheral surface of the upper half portion 12a toward the axis of the main body 13a. Since the air grooves 15 are provided on the outer peripheral surface of the main body 13a, stress concentrates near each air groove 15 in the nib 13, and the stress-concentrated portion is along the air grooves 15 shown in FIG. It is in a state where it extends obliquely in the circumferential direction of the main body 13a with respect to the axis of the molding hole 14. Further, this stress concentration occurs in the vicinity of the plurality of air grooves 14 provided at equal intervals in the circumferential direction of the main body 13a.
【００２１】ニブ１３が上半部１２ａへ圧入された後、
図１に示すようにライナー１７を収容孔１２の下半部１
２ｂへ圧入する。そして、ノックアウトピンＫを、その
先端が成形孔上半部１４ａの底面に対して面一となるよ
うに、下方からノックアウトピン挿通孔１８及び成形孔
下半部１４ｂへ挿入する。そして、素材Ｍを成形孔上半
部１４ａ内に入れた状態で、押圧ピンＰを上方から成形
孔上半部１４ａへ挿入する。このとき、成形孔上半部１
４ａ内の空気は、各エア抜き孔１６及び各エア溝１５を
介して外部へ排出される。After the nib 13 is pressed into the upper half 12a,
As shown in FIG. 1, the liner 17 is accommodated in the lower half 1 of the receiving hole 12.
Press into 2b. Then, the knockout pin K is inserted into the knockout pin insertion hole 18 and the molding hole lower half portion 14b from below so that the tip thereof is flush with the bottom surface of the molding hole upper half portion 14a. Then, while the material M is placed in the upper half portion 14a of the forming hole, the pressing pin P is inserted into the upper half portion 14a of the forming hole from above. At this time, the upper half 1 of the forming hole
The air in 4a is discharged to the outside through each air vent hole 16 and each air groove 15.
【００２２】その後、成形孔上半部１４ａへ挿入された
押圧ピンＰで、素材ＭをノックアウトピンＫへ向かって
押し付けると、素材Ｍは成形孔上半部１４ａの内面に対
応した形状にされる。素材Ｍが成形孔上半部１４ａの内
面に対応した形状になると、押圧ピンＰが成形孔上半部
１４ａ内から上方へ抜きだされる。そして、ノックアウ
トピンＫが成形孔下半部１４ｂから成形孔上半部１４ａ
内へ押し込まれ、そのノックアウトピンＫにより前記素
材Ｍが外部へ押し出される。Thereafter, when the material M is pressed toward the knockout pin K with the pressing pin P inserted into the upper half portion 14a of the forming hole, the material M is formed into a shape corresponding to the inner surface of the upper half portion 14a of the forming hole. . When the material M has a shape corresponding to the inner surface of the molding hole upper half portion 14a, the pressing pin P is pulled out upward from the inside of the molding hole upper half portion 14a. Then, the knockout pin K moves from the molding hole lower half 14b to the molding hole upper half 14a.
The material M is pushed in and the material M is pushed out by the knockout pin K.
【００２３】以上詳述した本実施形態では、下記（ａ）
〜（ｃ）に示す効果がある。 （ａ）本体１３ａにおける応力集中した部分が成形孔１
４の軸線に沿って延びた状態にならず、成形孔１４の軸
線に対して本体１３ａの周方向へ傾斜した状態になる。
そのため、前記応力集中した部分を本体１３ａの周方向
へ分散させることができるので、従来と異なり本体１３
ａにクラックを発生させにくくすることができる。In this embodiment described in detail above, the following (a)
(C). (A) The stress-concentrated portion of the main body 13a is the molding hole 1
4 does not extend along the axis of No. 4 but is inclined in the circumferential direction of the main body 13a with respect to the axis of the molding hole 14.
Therefore, the stress-concentrated portion can be dispersed in the circumferential direction of the main body 13a, which is different from the conventional case.
It is possible to make it difficult for cracks to occur in a.
【００２４】（ｂ）ニブ１３を収容孔１２の上半部１２
ａへ圧入するとき、エア溝１５のエッジ１５ａが収容孔
１２の軸線に対して斜めになった状態で上半部１２ａの
内周面に接触する。従って、エア溝がほぼニブの軸線方
向に沿って延びていた従来と異なり、エッジ１５ａが上
半部１２ａの内周面を引っ掻いて傷をつけてしまうのを
防止することができる。そのため、ニブ１３の交換時に
上半部１２ａの内周面を研磨する必要がなくなるため、
そのニブ１３の交換作業を容易に行うことができる。(B) The upper half portion 12 of the receiving hole 12 for receiving the nib 13
When press-fitting into a, the edge 15a of the air groove 15 contacts the inner peripheral surface of the upper half portion 12a in a state in which the edge 15a of the air groove 15 is inclined with respect to the axis of the accommodation hole 12. Therefore, unlike the conventional case where the air groove extends substantially along the axial direction of the nib, it is possible to prevent the edge 15a from scratching and damaging the inner peripheral surface of the upper half portion 12a. Therefore, it is not necessary to polish the inner peripheral surface of the upper half portion 12a when replacing the nib 13,
The replacement work of the nib 13 can be easily performed.
【００２５】（ｃ）ニブ１３を収容孔１２の上半部１２
ａへ圧入したとき、本体１３ａの周方向に等間隔をおい
て設けられた複数のエア溝１４の近傍にて、それぞれ応
力集中が起きる。従って、本体１３ａの周方向に対し偏
って応力が集中するのを防止することができる。(C) The nib 13 is placed in the upper half 12 of the receiving hole 12.
When press-fitted into a, stress concentration occurs in the vicinity of the plurality of air grooves 14 provided at equal intervals in the circumferential direction of the main body 13a. Therefore, it is possible to prevent the stress from being concentrated in a biased manner with respect to the circumferential direction of the main body 13a.
【００２６】尚、本発明は、例えば以下のように変更し
て具体化することもできる。 （１）本実施形態では、エア溝１５を成形孔１４の軸線
に対して本体１３ａの周方向へ傾斜して延びるように設
けたが、エア溝１５の延びる方向を成形孔１４の軸線に
沿って延びる方向以外の方向へ適宜変更してもよい。例
えば、エア溝１５を、そのエア溝１５の長手方向に沿っ
た複数箇所で滑らかに湾曲させてジグザクにしてもよ
い。The present invention can be embodied with the following modifications, for example. (1) In the present embodiment, the air groove 15 is provided so as to extend obliquely in the circumferential direction of the main body 13a with respect to the axis of the forming hole 14, but the extending direction of the air groove 15 is along the axis of the forming hole 14. The direction may be appropriately changed to a direction other than the extending direction. For example, the air groove 15 may be smoothly curved at a plurality of locations along the longitudinal direction of the air groove 15 to form a zigzag pattern.
【００２７】（２）本実施形態では、ニブ１３の本体１
３ａに四つのエア溝１５を設けたが、そのエア溝１５の
数を適宜変更してもよい。 （３）本実施形態において、本体１３ａの周方向におけ
る各エア溝１５間の間隔を等間隔にしなくてもよい。こ
の場合、各エア溝１５間の間隔を等しくしなくてもよい
分、ニブ１３の形成を容易に行うことができる。(2) In this embodiment, the main body 1 of the nib 13
Although four air grooves 15 are provided in 3a, the number of the air grooves 15 may be changed appropriately. (3) In the present embodiment, the intervals between the air grooves 15 in the circumferential direction of the main body 13a do not have to be equal. In this case, the nibs 13 can be easily formed because the intervals between the air grooves 15 do not have to be equal.
【００２８】（４）本実施形態では、外周面がテーパ状
となるニブ１３に本発明を具体化しが、これに代えて成
形孔１４の軸線方向において等径のニブに本発明を具体
化してもよい。この場合も実施形態と同様の効果があ
る。(4) In the present embodiment, the present invention is embodied in the nib 13 having a tapered outer peripheral surface. Instead, however, the present invention is embodied in a nib having an equal diameter in the axial direction of the molding hole 14. Good. In this case also, the same effect as the embodiment is obtained.
【００２９】（５）本実施形態では、ニブ１３の半径を
収容孔１２の半径よりも０．５〜０．６％大径にした
が、その値を適宜変更してもよい。(5) In the present embodiment, the radius of the nib 13 is 0.5 to 0.6% larger than the radius of the accommodation hole 12, but the value may be changed appropriately.
【００３０】[0030]
【発明の効果】請求項１記載の発明では、応力集中した
部分が成形孔の軸線に沿って延びた状態にならないた
め、前記応力集中した部分を本体の周方向に分散して、
本体にクラックを発生させにくくすることができる。According to the invention of claim 1, since the stress-concentrated portion does not extend along the axis of the forming hole, the stress-concentrated portion is dispersed in the circumferential direction of the main body,
It is possible to make it difficult for the main body to crack.
【００３１】請求項２記載の発明では、請求項１記載の
発明の効果に加え、エア溝のエッジが収容孔の軸線に対
して斜めになった状態で前記収容孔の内周面に接触する
ため、そのエッジにより収容孔の内周面に傷がつくのを
防止することができる。According to the invention of claim 2, in addition to the effect of the invention of claim 1, the edge of the air groove is in contact with the inner peripheral surface of the accommodation hole in a state of being inclined with respect to the axis of the accommodation hole. Therefore, it is possible to prevent the inner peripheral surface of the accommodation hole from being scratched by the edge thereof.
【００３２】請求項３記載の発明では、請求項１又は２
記載の発明の作用に加え、前記本体の周方向に等間隔を
おいて複数設けられた各エア溝の近傍においてそれぞれ
応力が集中する。従って、本体の周方向に対し偏って応
力が集中するのを防止することができる。According to the invention of claim 3, claim 1 or 2
In addition to the action of the invention described above, stress concentrates in the vicinity of each air groove provided at equal intervals in the circumferential direction of the main body. Therefore, it is possible to prevent the stress from being concentrated in a biased manner with respect to the circumferential direction of the main body.
【図１】本実施形態の鍛造型及びニブを示す断面図。FIG. 1 is a sectional view showing a forging die and a nib of the present embodiment.
【図２】ニブを示す斜視図。FIG. 2 is a perspective view showing a nib.
【図３】ニブを示す平断面図。FIG. 3 is a plan sectional view showing a nib.
【図４】ニブを示す平面図。FIG. 4 is a plan view showing a nib.
【図５】従来のニブを示す斜視図。FIG. 5 is a perspective view showing a conventional nib.
【図６】従来のニブを示す平断面図。FIG. 6 is a plan sectional view showing a conventional nib.
１１…ケース、１２…収容孔、１３…ニブ、１３ａ…本
体、１４…成形孔、１５…エア溝、Ｍ…素材。11 ... Case, 12 ... Storage hole, 13 ... Nib, 13a ... Main body, 14 ... Molding hole, 15 ... Air groove, M ... Material.
Claims (3)
容孔（１２）に圧入される本体（１３ａ）を備え、その
本体（１３ａ）には前記収容孔（１２）と同軸上に延び
る成形孔（１４）を設け、更に本体（１３ａ）の外面に
は成形孔（１４）と連通するエア溝（１５）を凹設し、
前記成形孔（１４）に入れられた素材（Ｍ）を同成形孔
（１４）の内面に対応した形状にするために押圧したと
き、成形孔（１４）内のエアがエア溝（１５）を介して
ケース（１１）の外部へ排出されるようにした鍛造型の
ニブにおいて、 前記エア溝（１５）を成形孔（１４）の軸線に沿って延
びる方向以外の方向へ延びるように設けた鍛造型のニ
ブ。1. A forging die case (11) is provided with a body (13a) press-fitted into a housing hole (12) provided in the case (11), and the body (13a) extends coaxially with the housing hole (12). A forming hole (14) is provided, and an air groove (15) communicating with the forming hole (14) is provided on the outer surface of the main body (13a).
When the material (M) contained in the forming hole (14) is pressed to have a shape corresponding to the inner surface of the forming hole (14), the air in the forming hole (14) causes the air groove (15) to move. A forging die nib adapted to be discharged to the outside of the case (11) through the forging in which the air groove (15) is provided so as to extend in a direction other than the direction along the axis of the forming hole (14). Type nibs.
軸線に対し本体（１３ａ）の周方向へ傾斜して延びるよ
うに設けられている請求項１記載の鍛造型のニブ。2. The nib of a forging die according to claim 1, wherein the air groove (15) is provided so as to extend obliquely with respect to the axis of the forming hole (14) in the circumferential direction of the body (13a).
周方向に等間隔をおいて複数設けられている請求項１又
は２記載の鍛造型のニブ。3. A nib for a forging die according to claim 1, wherein a plurality of the air grooves (15) are provided at equal intervals in the circumferential direction of the main body (13a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12445896A JPH09308937A (en) | 1996-05-20 | 1996-05-20 | Nib for forging die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12445896A JPH09308937A (en) | 1996-05-20 | 1996-05-20 | Nib for forging die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09308937A true JPH09308937A (en) | 1997-12-02 |
Family
ID=14886027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12445896A Pending JPH09308937A (en) | 1996-05-20 | 1996-05-20 | Nib for forging die |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09308937A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102335708A (en) * | 2011-08-19 | 2012-02-01 | 江苏森威精锻有限公司 | Air outlet hole structure of die |
| JP2015178121A (en) * | 2014-03-19 | 2015-10-08 | 高周波熱錬株式会社 | Shaft holding sleeve and shaft enlargement processing machine, and jig for shaft enlargement processing machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0445206A (en) * | 1990-06-12 | 1992-02-14 | Aoyama Seisakusho:Kk | Manufacture of sintered hard alloy-made die |
| JPH0683131B2 (en) * | 1986-02-15 | 1994-10-19 | 日本電気株式会社 | Wireless selective call receiver with display |
-
1996
- 1996-05-20 JP JP12445896A patent/JPH09308937A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0683131B2 (en) * | 1986-02-15 | 1994-10-19 | 日本電気株式会社 | Wireless selective call receiver with display |
| JPH0445206A (en) * | 1990-06-12 | 1992-02-14 | Aoyama Seisakusho:Kk | Manufacture of sintered hard alloy-made die |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102335708A (en) * | 2011-08-19 | 2012-02-01 | 江苏森威精锻有限公司 | Air outlet hole structure of die |
| JP2015178121A (en) * | 2014-03-19 | 2015-10-08 | 高周波熱錬株式会社 | Shaft holding sleeve and shaft enlargement processing machine, and jig for shaft enlargement processing machine |
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