JPS5810010Y2 - Bolt with a hollow inside the tip - Google Patents
Bolt with a hollow inside the tipInfo
- Publication number
- JPS5810010Y2 JPS5810010Y2 JP1980006707U JP670780U JPS5810010Y2 JP S5810010 Y2 JPS5810010 Y2 JP S5810010Y2 JP 1980006707 U JP1980006707 U JP 1980006707U JP 670780 U JP670780 U JP 670780U JP S5810010 Y2 JPS5810010 Y2 JP S5810010Y2
- Authority
- JP
- Japan
- Prior art keywords
- tip
- bolt
- thread
- shaft
- shaft portion
- 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
Links
Landscapes
- Forging (AREA)
Description
【考案の詳細な説明】
この考案は、ボルトの先端部分に施された改良に係るも
のである。[Detailed Description of the Invention] This invention relates to an improvement made to the tip portion of the bolt.
ところで通常のボルトにおける軸部の先端は、ネジ山形
状の不良化を避は且つ使用時におけるネジ孔へのねじ込
みを容易にする目的で、而取りされているのが通例であ
る。Incidentally, the tip of the shaft portion of a normal bolt is usually rounded off in order to avoid deterioration of the thread shape and to facilitate screwing into a screw hole during use.
かかる面取りは、ヘッダー等の圧造機械でボルトブラン
クを圧造する工程に於て、第２図に例示する如く、ブラ
ンク軸部１１の先端外周へ図中の符号１２で示すように
形成されることが多い。Such a chamfer may be formed on the outer periphery of the tip of the blank shaft portion 11 as indicated by reference numeral 12 in the drawing, as illustrated in FIG. 2, during the process of forging a bolt blank with a forging machine such as a header. many.
然し乍ら、この面取りを上記のような圧造加工（こよっ
て行なうと、その面取りされた個所及びその周辺が、加
二［時の応力集中に伴なって加工硬化を起こすため、次
段のネジ転造に際して転造ダイスに余計な負担を掛け、
該ダイスの上記面取り部分附近へ押し付けられる個所に
、ネジ山の破損や早期摩耗を生ぜしめ易い。However, if this chamfering is performed by the above-mentioned heading process, the chamfered area and its surroundings will become work hardened due to the stress concentration at the time of joining, so that the next stage of thread rolling will be difficult. When rolling, an unnecessary burden is placed on the rolling die,
The portion of the die that is pressed near the chamfered portion is likely to cause damage to the thread or premature wear.
そこでブランク軸部の先端を、充分な長さにわたり円錐
形もしくはこれに近い形状にすぼめて、局部的に集中す
る加工硬化の緩和を図り乍ら、然もその先端部分にはネ
ジ山を形成しないようにすれば、ネジ転造時の上記した
問題は解決されるが、その反面に於ては、軸部先端の雄
ネジとして役立たない部分が長くなり過ぎて、該部分だ
け材料が無駄になり、且つ重量も多くなる。Therefore, the tip of the blank shaft is narrowed down to a conical shape or a shape close to this over a sufficient length to alleviate locally concentrated work hardening, but at the same time, no thread is formed at the tip. This will solve the above-mentioned problem when thread rolling, but on the other hand, the part at the tip of the shaft that is not useful as a male thread will become too long, and material will be wasted in that part. , and the weight also increases.
本考案は、ポル１−に関する上記したような問題点に対
処して、ネジ転造時の不都合を回避し乍ら併せて材料の
節減と軽量化を可能ならしめるため、軸部先端を砲弾形
にすぼめて内部を空洞化するようにしたものである。The present invention addresses the above-mentioned problems with POL 1-, and in order to avoid the inconvenience during thread rolling, and at the same time to save material and reduce weight, the tip of the shaft is shaped like a bullet. It was narrowed down to make the inside hollow.
以下これを第１図に示す実施例について詳述する。This will be described in detail below with reference to the embodiment shown in FIG.
図に於て１は頭部２及び軸部３からなるボルトであって
、軸部３の外周にはネジ山４が形成されている。In the figure, reference numeral 1 denotes a bolt consisting of a head 2 and a shaft portion 3, and a screw thread 4 is formed on the outer periphery of the shaft portion 3.
上記軸部の先端部分３′は、円錐形ないしこれに近い形
状にすぼめて砲弾形に形成され、且つその内部には、同
じく円錐形ないしこれに近い形状の空洞５が設けられて
いる。The tip portion 3' of the shaft portion is formed into a cannonball shape by narrowing down to a conical shape or a shape close to this, and a cavity 5, which is also shaped like a conical shape or close to this, is provided inside the tip portion 3'.
かかる先端部分３′の外周にはネジ山４が形成されてお
らす、従ってネジの有効長さでは、この先端部分３′を
除外して確保されている。A thread 4 is formed on the outer periphery of the tip portion 3', so that the effective length of the screw is secured excluding the tip portion 3'.
またこの先端部分３′は充分な軸方向長さを有し、例え
ばその長さ１１は軸部３の直径ｄに近く設定されている
。Further, this tip portion 3' has a sufficient axial length, for example, its length 11 is set close to the diameter d of the shaft portion 3.
なお上記の空洞５は、頭部２及び軸部３の圧造時に於て
、まず軸部先端へ円筒形の孔を設け、次いでその先端部
分を前記した砲弾形に絞ることで形成される。The above-mentioned cavity 5 is formed by first providing a cylindrical hole at the tip of the shaft, and then squeezing the tip into the above-described bullet shape when forging the head 2 and the shaft 3.
従ってこの砲弾形先端部分３′及びその附近の外周面に
は、該部分が充分な軸方向長さを有することもあって、
前記した曲取り部分にみられるほどの極端な加工硬化を
生じていない。Therefore, this bullet-shaped tip portion 3' and its surrounding outer peripheral surface have sufficient axial length, so that
Extreme work hardening as seen in the curved portion described above does not occur.
またネジ山４は、軸部の先端部分３′が上記の如く或形
された後の段階に於て、転造加工により形成されるもの
とし、従って加工硬化が懸念される先端部分３′の外周
には、特に意図しなくても、該ネジ山がほとんど形成さ
れないことになる。Further, the thread 4 is formed by rolling at a stage after the tip portion 3' of the shaft portion has been shaped as described above, and therefore, the tip portion 3', where work hardening is a concern, is formed. Almost no threads are formed on the outer periphery, even if this is not intended.
以上の如く、本考案はボルト軸部の先端部分を充分な軸
方向長さにわたり砲弾形にすぼめて内部を空洞化し、こ
の先端部分を除いた軸部外周面にネジ山を形成せしめる
ようにしたものであるから、かかる本考案によれば、軸
部の先端部分及びその附近における圧造成形に伴なう加
工硬化を大巾に緩和し得て、然も該先端部分にはネジ山
を形成しないことにより、ネジ転造にまつわる前記した
従来の問題点を解消し得、また先端部分を空洞化したこ
とにより材料の節減と軽量化を実現し得、更に先端部分
の砲弾形なる形状により当該ボルトのネジ孔への差込み
を容易ならしめ得る等の効果が期待できる。As described above, in the present invention, the tip of the bolt shaft is narrowed into a bullet shape over a sufficient length in the axial direction to make the inside hollow, and a thread is formed on the outer peripheral surface of the shaft excluding this tip. Therefore, according to the present invention, the work hardening caused by forging at the tip of the shaft and its vicinity can be greatly alleviated, and no thread is formed in the tip. As a result, the above-mentioned conventional problems associated with thread rolling can be solved, and by making the tip part hollow, it is possible to save material and reduce the weight.Furthermore, the bullet-shaped tip part makes it possible to reduce the weight of the bolt. Effects such as ease of insertion into screw holes can be expected.
第１図は本考案の実施例を示す使用状態の欠截側面図、
第２図は従来例のネジ転造前における軸部先端附近を示
す一部欠截側面図である。
１・・・・・・ボルト、２・・・・・・頭部、３・・・
・・・軸部、３′・・・・・・先端部分、４・・・・・
・ネジ山、５・・・・・・空洞。FIG. 1 is a cutaway side view of an embodiment of the present invention in use;
FIG. 2 is a partially cutaway side view showing the vicinity of the tip of the shaft portion before thread rolling in the conventional example. 1...Bolt, 2...Head, 3...
...Shaft part, 3'...Tip part, 4...
・Screw thread, 5... hollow.
Claims (1)
囲にわたり砲弾形にすぼめられて内部か空洞化され、且
つその先端部分を除く軸部外周面にネジ山が形成されて
いることを特徴とする先端内部に空洞を設けたボルト。The tip portion of the shaft portion is narrowed into a bullet shape over an axial length range close to the diameter of the shaft portion, and the inside thereof is hollow, and a thread is formed on the outer circumferential surface of the shaft portion except for the tip portion. A bolt with a hollow inside the tip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980006707U JPS5810010Y2 (en) | 1980-01-22 | 1980-01-22 | Bolt with a hollow inside the tip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980006707U JPS5810010Y2 (en) | 1980-01-22 | 1980-01-22 | Bolt with a hollow inside the tip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56108017U JPS56108017U (en) | 1981-08-21 |
| JPS5810010Y2 true JPS5810010Y2 (en) | 1983-02-23 |
Family
ID=29603376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980006707U Expired JPS5810010Y2 (en) | 1980-01-22 | 1980-01-22 | Bolt with a hollow inside the tip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5810010Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5411458A (en) * | 1977-06-29 | 1979-01-27 | Toshiba Corp | Comparison circuit |
-
1980
- 1980-01-22 JP JP1980006707U patent/JPS5810010Y2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5411458A (en) * | 1977-06-29 | 1979-01-27 | Toshiba Corp | Comparison circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56108017U (en) | 1981-08-21 |
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