JP4352207B2 - Bolt, manufacturing die and manufacturing method - Google Patents
Bolt, manufacturing die and manufacturing method Download PDFInfo
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- JP4352207B2 JP4352207B2 JP2002383349A JP2002383349A JP4352207B2 JP 4352207 B2 JP4352207 B2 JP 4352207B2 JP 2002383349 A JP2002383349 A JP 2002383349A JP 2002383349 A JP2002383349 A JP 2002383349A JP 4352207 B2 JP4352207 B2 JP 4352207B2
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- Prior art keywords
- bolt
- diameter
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Description
【０００１】
【発明の属する技術分野】
本発明はボルトの軸部の振れや雌ねじと締結入口穴との穴ずれによる、首下Ｒ部の締結入口穴への干渉等による締付け不良対策に関するものである。
【０００２】
【従来の技術】
従来より、ボルトの首下軸部が締結入口穴よりクリアランスを大きくすると軸振れが起き易く、また雌ねじと締結入口穴との穴ずれがあると、ボルトの首下Ｒ部と締結入口穴とが干渉し、そのまま締付けると、ある期間経過後に振動等でＲ部が外れたり、軸振れが小さくなったりするとボルトのゆるみが発生し、締付け不良となることがある。そのために座金を組込んだり、塑性加工で首下軸部に予め円柱部を設けて、首下Ｒ部を切削で結び入れ加工をして取除いたり、或は締結穴の入口を大きくしたりして、軸振れや穴ずれ等の首下Ｒ部と締結入口穴との干渉を防いでいた。
【０００３】
【発明が解決しようとする課題】
しかしながら、座金組込みや切削結び入れ加工はコスト高であり、また締結穴を大きくする方法は、ボルトの座面との接触面積が小さくなり、へたりや陥没が発生したり、ボルトの軸振れも発生し易くなるので、締付け不良になる可能性があった。
【０００４】
【課題を解決するための手段】
本発明は上記従来の課題を解決するための手段として、ボルトの頭部（１）首下Ｒ部（２）のすぐ下側に、首下Ｒの上部径（２１）より若干小さい径から若干大きい径の円柱部（３）を設け、円柱部（３）の下側にはねじ谷径と同じか、若干大きい径のくぼみ巾部（４）があり、その下に有効径軸部（５）があって締結ねじ部（６）が形成されている。首下Ｒ（２）のすぐ下の円柱部（３）とくぼみ巾部（４）は転造絞りダイス（７）で有効径軸部（５）の上部を絞り加工して形成し、同時に締結ねじ部（６）も転造ダイス（９）で形成することが望ましい。本発明は、以上の構成よりなるボルトである。
【０００５】
【発明の実施の形態】
以下、本発明の実施の形態について説明する。
本発明の一実施形態によるボルトを図１に示す。図１に示すボルトは、ボルトの頭部（１）首下Ｒ部（２）のすぐ下側に、首下Ｒの上部径（２１）より若干小さい径から若干大きい径の円柱部（３）を設ける。望ましくは上部径（２１）より若干大きい径の方が良いが、若干小さくても効果はある。円柱部の巾は１ｍｍ〜１０ｍｍくらいで望ましくは２ｍｍとする。円柱部（３）の下側にはねじ谷径と同じか、若干大きい径のくぼみ巾部（４）があり、望ましくは谷径より若干大きくする。くぼみ巾部の巾は１．５ｍｍ〜１２ｍｍくらいで望ましくは２．５ｍｍとする。その下に有効径軸部（５）があって締結ねじ部（６）が形成されている。尚、ボルト首下と円柱部の間は２ｍｍ以下で望ましくは１ｍｍとする。製造方法としては図５及び図６で示すとうり、ボルトの首下が首下Ｒ部（２）と有効径軸部（５）とからなる冷間塑性加工品（１２）を、転造絞りダイス（７）で有効径軸部（５）の上部を絞り加工して、首下Ｒ（２）のすぐ下に円柱部（３）とくぼみ巾部（４）を形成し、同時に転造ダイス（９）で締結ねじ部（６）を形成する。このようにして製造された該ボルト（１１）は、首下Ｒ（２）の上部径（２１）より若干小さい径から若干大きい径で円柱部（３）が形成されているので、首下Ｒ部（２）と締結入口穴との干渉はほとんどなく、また締結入口穴と円柱部（３）のクリアランスも少なくなるので、軸振れもなくなり、締付け不良が効果的に防止できる。また転造での同時加工なのでコストも低減できる。
【０００６】
本発明は図面に示した態様に限定されることはなく、本発明の範囲を逸脱しない限り種々の変更を施すことができる。例えば、本発明ではボルト頭部形状はつばやフランジがついているものであれば六角形状でも丸形状等でもよい。また製造ダイスは平ダイスでもロータリーダイスでもよいし、首下軸部が有効径部と径が異なるそれ以上の径の円柱部と首下Ｒ部を予め冷間塑性加工したものを転造絞り加工でＲ部の上部径以上の円柱部にしても良い。また図９のくぼみ巾部下にねじ部を設けたボルト（１７）で軸振れ防止の効果を高めても良い。その加工方法を図１０に示す。
【０００７】
【発明の効果】
本発明のボルトによれば、軸振れや穴ずれ等による首下Ｒ部の干渉や首下軸部と締結入口穴とのクリアランスが大きくて軸振れが発生する等の締付け不良を円柱部で効果的に防ぐことができる。また転造加工方法により、低コストで提供することができる。
【図面の簡単な説明】
図１〜図１０は本発明の一実施例を示すものである。
【図１】本発明のボルト正面図
【図２】本発明の加工前冷間塑性有効径ボルト
【図３】本発明の製造転造絞りダイス正面図
【図４】本発明の製造転造絞りダイス側面図
【図５】本発明の一実施形態による円柱部加工正面図
【図６】前記ボルトの加工全体側面図
【図７】従来の座金組込みボルト
【図８】従来の首下Ｒ部切削結び入れによるボルト
【図９】本発明のくぼみ巾部下側にねじ部を別途設けたボルト
【図１０】前記本発明のボルト加工全体側面図
【符号の説明】
１１ 本発明ボルト
１ ボルト頭部
２ 首下Ｒ部
２１ 首下Ｒ上部径
３ 本発明円柱部
４ 本発明くぼみ巾部
５ 有効径軸部
６ 締結ねじ部
１２ 本発明の加工前冷間塑性有効径ボルト
７ 本発明の転造絞りダイス
７１ 本発明の転造絞りダイス
３３ 前記ダイスの円柱部加工部
４４ 前記ダイスのくぼみ巾部加工部
５５ 前記ダイスの有効径部押さえ部
８ ライナー
８１ ライナー
９ 締結ねじ転造ダイス
１３ 従来の座金組込みボルト
１０ 座金
１４ 従来の首下Ｒ部切削結び入れボルト
１５ 結び入れ部
１６ 有効径以上の径の円柱部
１７ 本発明のくぼみ巾部下側にねじ部を別途設けたボルト
１８ くぼみ巾部下側ねじ部
１９ 本発明転造絞りダイス
２０ くぼみ巾部下側ねじ部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a countermeasure against poor tightening due to interference with a fastening inlet hole of a lower neck R portion due to a swing of a shaft portion of a bolt or a hole shift between a female screw and a fastening inlet hole.
[0002]
[Prior art]
Conventionally, if the lower neck portion of the bolt has a larger clearance than the fastening inlet hole, shaft runout is likely to occur, and if there is a misalignment between the female screw and the fastening inlet hole, the lower neck R portion of the bolt and the fastening inlet hole are If interference occurs and tightening is performed as it is, if the R portion is detached due to vibration or the shaft runout is reduced after a certain period of time, the bolt may loosen, resulting in poor tightening. For this purpose, a washer is incorporated, a cylindrical part is provided in the neck lower shaft part in advance by plastic working, and the neck lower R part is removed by cutting, or the entrance of the fastening hole is enlarged. Thus, interference between the lower neck R portion and the fastening inlet hole, such as shaft runout and hole displacement, is prevented.
[0003]
[Problems to be solved by the invention]
However, it is costly to incorporate and wash the washer, and the method of enlarging the fastening hole reduces the contact area with the bolt seating surface, causes sag and depression, and causes the shaft to run out. Since it becomes easy to generate | occur | produce, there existed a possibility of becoming a fastening defect.
[0004]
[Means for Solving the Problems]
In the present invention, as means for solving the above-described conventional problems, a diameter slightly smaller than the upper diameter (21) of the lower neck R is slightly below the head (1) and the lower neck R (2) of the bolt. A cylindrical portion (3) having a large diameter is provided, and a concave width portion (4) having a diameter that is the same as or slightly larger than the thread valley diameter is provided on the lower side of the cylindrical portion (3). ) And the fastening screw portion (6) is formed. The cylindrical part (3) and the indentation width part (4) just below the neck R (2) are formed by drawing the upper part of the effective diameter shaft part (5) with a rolling drawing die (7) and fastening at the same time. It is desirable that the thread portion (6) is also formed by a rolling die (9). This invention is a volt | bolt which consists of the above structure.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
A bolt according to an embodiment of the present invention is shown in FIG. The bolt shown in FIG. 1 has a cylindrical portion (3) having a diameter slightly smaller than the upper diameter (21) of the lower neck R, just below the head (1) lower neck R (2) of the bolt. Is provided. Desirably, a slightly larger diameter than the upper diameter (21) is desirable, but even a little smaller is effective. The width of the cylindrical portion is about 1 mm to 10 mm, and preferably 2 mm. Below the cylindrical part (3) is a hollow part (4) having a diameter that is the same as or slightly larger than the thread valley diameter, and is preferably slightly larger than the valley diameter. The width of the recess width portion is about 1.5 mm to 12 mm, and preferably 2.5 mm. There is an effective diameter shaft portion (5) below, and a fastening screw portion (6) is formed. The space between the bolt neck and the cylindrical portion is 2 mm or less, preferably 1 mm. As shown in FIGS. 5 and 6, the manufacturing method is as follows. A cold plastic processed product (12) in which the bolt neck is composed of a lower neck R portion (2) and an effective diameter shaft portion (5) is formed by rolling drawing. The upper part of the effective diameter shaft part (5) is drawn with a die (7) to form a cylindrical part (3) and an indented width part (4) just below the neck R (2), and at the same time a rolling die In (9), the fastening screw portion (6) is formed. The bolt (11) manufactured in this way is formed with a cylindrical portion (3) having a slightly smaller diameter to a slightly larger diameter than the upper diameter (21) of the lower neck R (2). There is almost no interference between the portion (2) and the fastening inlet hole, and the clearance between the fastening inlet hole and the cylindrical portion (3) is reduced, so that shaft runout is eliminated, and poor tightening can be effectively prevented. In addition, the cost can be reduced because of simultaneous processing by rolling.
[0006]
The present invention is not limited to the embodiment shown in the drawings, and various modifications can be made without departing from the scope of the present invention. For example, in the present invention, the bolt head shape may be a hexagonal shape or a round shape as long as it has a flange or a flange. Also, the production die may be a flat die or a rotary die, and a rolling drawing process is performed on a cylinder part having a diameter larger than that of the effective diameter part of the neck part and a neck part having a diameter smaller than that of the neck part. In this case, it may be a cylindrical portion having an upper diameter larger than that of the R portion. Further, the effect of preventing shaft runout may be enhanced by a bolt (17) provided with a threaded portion below the recess width portion of FIG. The processing method is shown in FIG.
[0007]
【The invention's effect】
According to the bolt of the present invention, it is effective in the columnar portion to cause poor tightening such as shaft runout due to interference of the neck under R portion due to shaft runout or hole displacement, or a large clearance between the neck lower shaft portion and the fastening inlet hole. Can be prevented. Further, it can be provided at a low cost by the rolling method.
[Brief description of the drawings]
1 to 10 show an embodiment of the present invention.
FIG. 1 is a front view of a bolt of the present invention. FIG. 2 is a front view of a cold plastic effective diameter bolt of the present invention. FIG. 3 is a front view of a production rolling die of the present invention. Side view of the die [FIG. 5] Front view of machining the cylindrical portion according to an embodiment of the present invention [FIG. 6] Side view of the entire processing of the bolt [FIG. 7] Conventional bolt with a built-in washer [FIG. Bolt by tying [FIG. 9] Bolt with a thread portion provided separately below the recess width portion of the present invention [FIG. 10] Side view of the entire bolt processing of the present invention [Explanation of symbols]
11
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002383349A JP4352207B2 (en) | 2002-12-16 | 2002-12-16 | Bolt, manufacturing die and manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002383349A JP4352207B2 (en) | 2002-12-16 | 2002-12-16 | Bolt, manufacturing die and manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004197924A JP2004197924A (en) | 2004-07-15 |
| JP4352207B2 true JP4352207B2 (en) | 2009-10-28 |
Family
ID=32767097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002383349A Expired - Fee Related JP4352207B2 (en) | 2002-12-16 | 2002-12-16 | Bolt, manufacturing die and manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4352207B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5543519B2 (en) * | 2012-04-11 | 2014-07-09 | 株式会社ヤマザキアクティブ | Loosening bolt and manufacturing method thereof |
-
2002
- 2002-12-16 JP JP2002383349A patent/JP4352207B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004197924A (en) | 2004-07-15 |
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