JP2860472B2 - Anchor bolt and method of manufacturing the same - Google Patents
Anchor bolt and method of manufacturing the sameInfo
- Publication number
- JP2860472B2 JP2860472B2 JP21427896A JP21427896A JP2860472B2 JP 2860472 B2 JP2860472 B2 JP 2860472B2 JP 21427896 A JP21427896 A JP 21427896A JP 21427896 A JP21427896 A JP 21427896A JP 2860472 B2 JP2860472 B2 JP 2860472B2
- Authority
- JP
- Japan
- Prior art keywords
- anchor bolt
- bolt
- strength
- plastic working
- cold plastic
- 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 - Lifetime
Links
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- Foundations (AREA)
- Forging (AREA)
Description
【0001】[0001]
【発明の属する技術分野】本発明は土木建築用の鉄骨柱
の固定、機械設備の据え付け等のために、基礎コンクリ
ートに埋設されるアンカーボルト及びその製造方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor bolt buried in basic concrete for fixing steel columns for civil engineering construction, installing mechanical equipment, and the like, and a method of manufacturing the same.
【0002】[0002]
【従来の技術】従来、アンカーボルトとしては、コンク
リートとの付着力を増すために、基体となる棒鋼の軸線
方向に突設したリブ、全長にわたり一定間隔で以て円周
方向に突設したフシ等の表面突部を形成し、その先端部
にはネジ部を形成したものが見受けられる。2. Description of the Related Art Conventionally, as an anchor bolt, a rib protruding in the axial direction of a steel bar serving as a base body and a flange protruding in a circumferential direction at a constant interval over the entire length in order to increase the adhesion to concrete. It can be seen that a surface protruding portion such as is formed and a screw portion is formed at the tip thereof.
【0003】そして、アンカーボルトの先端部にボルト
を形成するには、先端部の表面突部を切削加工により除
去して、その表面を円柱形状に形成した後に、切削加工
でネジ切り加工しているため、素材の成形時に得られた
軸方向に並んだ結晶組織が中断され、ボルト形成部位の
強度が非加工部に比し低くなり、必要強度を得るにはそ
のワンサイズ上の径を有するアンカーボルトでなければ
役に立たず、コストが高価となる等の欠点を有してい
た。In order to form a bolt at the tip of the anchor bolt, the surface projection at the tip is removed by cutting, and the surface is formed into a cylindrical shape, and then threaded by cutting. As a result, the crystal structure aligned in the axial direction obtained at the time of molding the material is interrupted, the strength of the bolt forming part is lower than that of the non-processed part, and to obtain the required strength, it has a diameter one size larger than that If it is not an anchor bolt, it is useless and has disadvantages such as high cost.
【0004】[0004]
【発明が解決しようとする課題】本発明は、非加工部よ
りもボルト形成部位の強度を向上できる様にしたアンカ
ーボルト及びその製造方法を提供せんとするものであ
る。SUMMARY OF THE INVENTION An object of the present invention is to provide an anchor bolt capable of improving the strength of a bolt forming portion as compared with a non-processed portion and a method of manufacturing the same.
【0005】[0005]
【課題を解決するための手段】本発明は上記従来技術に
基づく、非加工部よりもボルト形成部位の強度が低い課
題に鑑み、アンカーボルト端部の表面突部のみを冷間塑
性加工により、略平坦化する様に変形させて、かかる加
工端部をアンカーボルトの基形部と略同径な略円柱形に
形成した後に、ネジ転造による冷間塑性加工により、前
記加工端部に雄ネジを形成することによって、冷間での
塑性変形による表面突部の変形及び雄ネジの形成によ
り、加工硬化させてボルト形成部位となる加工端部を非
加工部よりも強度を向上させる様にして、上記欠点を解
決せんとしたものである。In view of the problem that the strength of the bolt forming portion is lower than that of the non-processed portion based on the above-mentioned prior art, the present invention provides only the surface protrusion of the anchor bolt end by cold plastic working. After deforming so as to be substantially flat and forming such a processed end into a substantially cylindrical shape having substantially the same diameter as the base portion of the anchor bolt, the plastic end is formed on the processed end by cold plastic working by thread rolling. By forming screws, deformation of surface protrusions due to plastic deformation in the cold and formation of male threads, work hardening to improve the strength of the machined end, which is the bolt forming part, compared to the non-machined part. Thus, the above-mentioned disadvantage has been solved.
【0006】[0006]
【発明の実施の形態】以下本発明の実施の形態を図面に
基づいて説明すると、1は土木建築用の鉄骨柱の固定、
付属設備、機械設備の据え付け等のために、基礎コンク
リートに埋設されるアンカーボルトであり、該アンカー
ボルト1は図1に示す様に、断面円形状の基形部2であ
る棒鋼の表面に、軸線方向に突設したリブ、全長にわた
り一定間隔で以て円周方向に突設したフシ等の表面突部
3、3a…を形成してなり、基礎コンクリートから突出す
るアンカーボルト1の先端部にはボルト部4を形成して
いる。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.
An anchor bolt buried in foundation concrete for installation of ancillary equipment and mechanical equipment, etc. The anchor bolt 1 is provided on the surface of a steel bar as a base section 2 having a circular cross section as shown in FIG. A rib, which protrudes in the axial direction, and a surface protruding portion 3, 3a, such as a bush, which protrudes in the circumferential direction at regular intervals over the entire length, is formed at the tip of the anchor bolt 1 protruding from the foundation concrete. Form a bolt portion 4.
【0007】尚、アンカーボルト1の埋設基端部の形状
は、図1に示す様な真っ直ぐのもの以外に、埋設基端部
をU字状のフックを屈曲形成したり、又は図示しないア
ンカーばり若しくはアンカープレートを固定するため
に、埋設基端部に上記と同様なボルト部を形成しても良
い。The buried base end of the anchor bolt 1 is not limited to a straight shape as shown in FIG. 1, but may be a U-shaped hook formed by bending the buried base end or an anchor beam (not shown). Alternatively, in order to fix the anchor plate, a bolt portion similar to the above may be formed at the buried base end portion.
【0008】図1(a) のアンカーボルト1は、非加工状
態を示しており、アンカーボルト1の端部Y(ボルト部
4の形成箇所)において、表面突部3、3a…(図中Xで
表示する)のみを、冷間塑性加工して、ボルト部4を形
成する。The anchor bolt 1 shown in FIG. 1A shows a non-machined state. At the end Y of the anchor bolt 1 (where the bolt portion 4 is formed), surface projections 3, 3a. ) Is formed by cold plastic working to form the bolt portion 4.
【0009】ボルト部4は、図1(b) に示す様に、冷間
塑性加工により、アンカーボルト1の端部の表面突部
3、3a…のみを略平坦化する(表面突部3、3a…の平坦
化状態を示す2点鎖線)様に変形させて、かかる加工端
部5を基形部2の直径Dと略同一直径D1の略円柱形に形
成した後に、図1(c) に示す様に、ネジ転造による冷間
塑性加工により、前記加工端部5に、平均直径D2が基形
部2の直径D及び加工端部5の直径D1と殆ど変わらない
雄ネジ6を形成している。As shown in FIG. 1 (b), only the surface projections 3, 3a at the ends of the anchor bolt 1 are substantially flattened by the cold plastic working (see FIG. 1 (b)). 3a), the processed end portion 5 is formed into a substantially cylindrical shape having a diameter D1 substantially equal to the diameter D of the base portion 2 by deforming as shown in FIG. 1 (c). As shown in the figure, a male screw 6 whose average diameter D2 is almost the same as the diameter D of the base 2 and the diameter D1 of the processed end 5 is formed at the processed end 5 by cold plastic working by thread rolling. doing.
【0010】尚、フシの形状及び配置は、図1及び図2
に示す様な所謂横フシの場合、リブで半円に区分される
(図においては上下)両側のフシが、同一円周上に配置
せず、所定間隔ずれて互い違いに配置されたものの方
が、同一円周上に配置されるものより、均一な強度が得
られるので、前者の方がより良いが、かかる方式に限定
されることなく、例えば斜めフシの様に、表面突部3、
3a…を塑性変形させた時に、ボルト部4の全域で均等な
加工硬化できる連続したフシであっても良い。[0010] The shape and arrangement of the brush are shown in FIGS.
In the case of a so-called horizontal brush as shown in the figure, it is preferable that the brushes on both sides which are divided into semicircles by a rib (up and down in the figure) are not arranged on the same circumference but are staggered at a predetermined interval. Since the uniform strength can be obtained as compared with those arranged on the same circumference, the former is better. However, the present invention is not limited to such a method.
When the plastic deformation of 3a... Is performed, it may be a continuous brush that can uniformly work harden the entire area of the bolt portion 4.
【0011】次に、アンカーボルト1の製造方法につい
て説明する。尚、図においては、先端部にボルト部4を
設けたアンカーボルト1を示したが、アンカーボルト1
の先端部及び埋設基端部の両方にボルト部4を設けたも
のにあっても、同様な製造工程にて製造される。Next, a method of manufacturing the anchor bolt 1 will be described. In addition, although the figure shows the anchor bolt 1 provided with the bolt part 4 at the tip, the anchor bolt 1
Even when the bolt portion 4 is provided at both the distal end portion and the buried proximal end portion, it is manufactured in a similar manufacturing process.
【0012】先ず、図1(a) 及び図2中の1点鎖線で示
す様に、非加工状態のアンカーボルト1において、ボル
ト部4の形成箇所となる先端部Yにおける表面突部3、
3a…(図中Xで表示する)のみを、絞り加工、転造加工
又は冷間プレス加工などの冷間塑性加工、即ち再結晶温
度以下の温度で塑性変形する加工により、図1(b) 及び
図2中左端の実線で示す様に、基形部2の直径Dを保持
しつつ、略平坦化する様に、塑性変形して押し潰して圧
縮し、アンカーボルト1の基形部2の直径Dと略同一直
径D1となる表面滑らかな略円柱形に形成する。First, as shown by a dashed line in FIGS. 1A and 2, in the anchor bolt 1 in a non-processed state, the surface projection 3 at the tip end Y where the bolt portion 4 is formed,
Only 3a ... (indicated by X in the figure) is subjected to cold plastic working such as drawing, rolling, or cold pressing, that is, plastic working at a temperature lower than the recrystallization temperature, as shown in FIG. As shown by the solid line at the left end in FIG. 2, while maintaining the diameter D of the base portion 2, it is plastically deformed, crushed and compressed so as to be substantially flat, and the base portion 2 of the anchor bolt 1 is formed. It has a substantially cylindrical shape with a smooth surface and a diameter D1 substantially the same as the diameter D.
【0013】図1(b) 中、2点鎖線で示す部分は、図1
(a) で示す表面突部3、3a…が上記冷間塑性加工により
圧潰されて略平坦化した状態を示しており、この冷間塑
性加工により、圧潰された表面突部3、3a…の実質的な
材料移動は、アンカーボルト1の先端部Yの局部的な加
工のため、図1(b) の如く、図1(a) で示す非加工状態
よりもアンカーボルト1の長さ方向に若干長くなって吸
収対応されることとなり、表面突部3、3a…の塑性変形
により、加工硬化して静的強度や衝撃強度及び疲労強度
が大きくなる。In FIG. 1 (b), the portion indicated by the two-dot chain line corresponds to FIG.
The surface projections 3, 3a... shown in (a) are crushed by the above-mentioned cold plastic working and are almost flattened. The cold plastic working of the crushed surface projections 3, 3a. Substantially, the material is moved locally because the tip end portion Y of the anchor bolt 1 is locally worked, as shown in FIG. 1B, in the longitudinal direction of the anchor bolt 1 as compared with the unprocessed state shown in FIG. It becomes slightly longer to be absorbed, and the plastic deformation of the surface projections 3, 3a... Causes work hardening to increase static strength, impact strength and fatigue strength.
【0014】次いで、転造加工などの冷間塑性加工によ
り、上記加工端部5の表面層のみに塑性変形を施し、図
1(c) 、図3及び図2中2点鎖線で示す様に、平均直径
D2が基形部2の直径D及び加工端部5の直径D1と殆ど変
わらない雄ネジ6を形成する。Next, plastic deformation is applied only to the surface layer of the processing end portion 5 by cold plastic working such as rolling, as shown by the two-dot chain line in FIGS. 1 (c), 3 and 2. , Average diameter
D2 forms a male screw 6 which is almost the same as the diameter D of the base 2 and the diameter D1 of the machined end 5.
【0015】転造加工などの冷間塑性加工による塑性変
形においては、切削加工でネジ切り加工したものが、素
材の成形時に得られた軸方向に並んだ結晶組織が中断さ
れるのに対し、素材の盛り上がりによって雄ネジ6の形
状が形成されるので、連続した繊維状の組織が得られる
と共に、加工硬化して静的強度や衝撃強度及び疲労強度
が大きくなる。[0015] In plastic deformation by cold plastic working such as rolling, in the case of thread cutting by cutting, the crystal structure aligned in the axial direction obtained at the time of forming the material is interrupted. Since the shape of the male screw 6 is formed by the swelling of the material, a continuous fibrous structure can be obtained, and work hardening increases static strength, impact strength, and fatigue strength.
【0016】尚、かかる塑性変形による結晶組織の連続
性の維持は、第1工程の圧潰工程でも同様であり、第1
工程の圧潰工程及び第2工程のネジ成形工程を経て、ボ
ルト部4の強度を、ボルト部4以外の非加工部又は非加
工状態のアンカーボルト1である母材強度以上にしてい
る。The continuity of the crystal structure by the plastic deformation is maintained in the crushing step of the first step.
Through the crushing step of the step and the screw forming step of the second step, the strength of the bolt portion 4 is set to be equal to or higher than the base material strength of the non-processed portion other than the bolt portion 4 or the non-processed anchor bolt 1.
【0017】又、図1及び図2に示したアンカーボルト
1は、図面上において、表面突部3、3a…を簡略して表
しているため、図1(b) 中、2点鎖線で示す平坦化状態
のフシの非成形部Aが、平坦化状態のフシ幅Bより若干
大きく、即ち同一円周上で、平坦化状態のフシ幅Bが、
フシの無い(フシの非成形部A)部分と同一又はそれ以
上でない様に見られるが、実際のアンカーボルト1の母
材は図4に示す詳細図の様に、フシ幅Bがフシの非成形
部Aより広いため、同一円周上において、その半円部分
は必ずフシ幅Bが、フシの非成形部Aよりも幅広に加工
硬化しているため、同一円周上において半径方向で途切
れた部分の強度を補っている。The anchor bolts 1 shown in FIGS. 1 and 2 show the surface projections 3, 3a... In a simplified manner in the drawings, and are shown by two-dot chain lines in FIG. 1 (b). The non-molded portion A of the flattened brush is slightly larger than the flattened brush width B, that is, the flattened brush width B on the same circumference.
Although it is seen that it is not the same as or more than the part without the bulge (non-molded part A of the bulge), the actual base material of the anchor bolt 1 has a bulge width B of the bulge width as shown in the detailed view of FIG. Because it is wider than the molded part A, the semicircular part always has a width B which is work hardened wider than the non-molded part A on the same circumference, so it is interrupted in the radial direction on the same circumference. To compensate for the strength of the part.
【0018】[0018]
【実施例】次に、本発明の実施例は下記の通りである。
母材の種類SD295A及びSD345、呼び名D25
のアンカーボルト(横フシ)を使用して第1工程を絞り
加工、第2工程をネジ転造加工で行った。その結果、い
ずれのアンカーボルトにあっても、ボルト部の引張強さ
が母材強度に対して概ね10%向上した。Next, examples of the present invention are as follows.
Base material types SD295A and SD345, D25
The first step was performed by drawing using an anchor bolt (horizontal brush), and the second step was performed by thread rolling. As a result, the tensile strength of the bolt portion was improved by about 10% with respect to the base material strength in any of the anchor bolts.
【0019】[0019]
【発明の効果】要するに本発明は、表面にフシ及びリブ
などの表面突部を有するアンカーボルト1であって、ア
ンカーボルト1端部の表面突部3、3a…のみを冷間塑性
加工により、略平坦化する様に変形させて、かかる加工
端部5をアンカーボルト1の基形部2と略同径な略円柱
形に形成した後に、ネジ転造による冷間塑性加工によ
り、前記加工端部5に雄ネジ6を形成したので、塑性変
形による表面突部3、3a…の圧潰及び雄ネジ6の形成に
より、加工端部5を加工硬化して非加工部よりも強度を
向上させられ、従来の様に、ワンサイズ上の径を有する
アンカーボルトを使用する必要がないため、コストを低
減できる。In summary, the present invention is directed to an anchor bolt 1 having a surface projection such as a bush and a rib on the surface, and only the surface projections 3, 3a at the end of the anchor bolt 1 are formed by cold plastic working. After being deformed so as to be substantially flattened and forming the processed end 5 into a substantially cylindrical shape having substantially the same diameter as the base 2 of the anchor bolt 1, the processed end is formed by cold plastic working by thread rolling. Since the male screw 6 is formed in the portion 5, the processed end portion 5 is work hardened by the crushing of the surface protrusions 3, 3a... Since there is no need to use an anchor bolt having a diameter one size larger than in the related art, the cost can be reduced.
【0020】又、表面にフシ及びリブなどの表面突部を
有するアンカーボルト1の製造方法であって、アンカー
ボルト1端部の表面突部3、3a…のみを冷間塑性加工に
より、略平坦化する様に変形させて、かかる加工端部5
をアンカーボルト1の基形部2と略同径な略円柱形に形
成する工程と、ネジ転造による冷間塑性加工により、前
記加工端部5に雄ネジ6を形成する工程から成り、加工
端部5の強度を母材強度以上にしたので、アンカーボル
ト1の表面突部3、3a…のみを冷間塑性加工するだけの
ため、作業性、取り扱い性が良く容易に加工出来、又表
面突部3、3a…又は基形部2の表面部分だけに対する加
工であるため、加工に要する力が僅かで、設備の簡素化
が図れ、加工コストを低減でき、しかも表面突部3、3a
…の塑性変形により、アンカーボルト1の表面を加工硬
化して、加工端部5の強度を母材強度以上に向上させる
ことができる。A method of manufacturing an anchor bolt 1 having a surface projection such as a brush and a rib on its surface, wherein only the surface projections 3, 3a at the end of the anchor bolt 1 is substantially flattened by cold plastic working. The processed end 5
And forming a male screw 6 on the processing end 5 by cold plastic working by thread rolling. Since the strength of the end portion 5 is set to be equal to or greater than the base material strength, only the surface protrusions 3, 3a... .. Or the surface portion of the base 2 only requires a small amount of processing power, simplifies equipment and reduces processing costs, and furthermore, the surface projections 3, 3a
The surface of the anchor bolt 1 is work-hardened by the plastic deformation of..., And the strength of the processed end portion 5 can be improved to the base material strength or more.
【0021】又、冷間塑性加工により、雄ネジ6を成形
しているため、切削加工で雄ネジを成形した場合の様
に、素材の成形時に得られた軸方向に並んだメタルフロ
ー(連続した結晶構造のつながり)が中断されず、連続
した繊維状の組織が得られると共に、加工硬化して静的
強度や衝撃強度及び疲労強度を向上させられ、加工端部
5の強度を向上できる等その実用的効果甚だ大なるもの
である。Further, since the male screw 6 is formed by cold plastic working, the metal flow (continuous) formed in the axial direction obtained at the time of forming the material, as in the case of forming the male screw by cutting, is used. Uninterrupted crystal structure), a continuous fibrous structure can be obtained, and work hardening improves static strength, impact strength and fatigue strength, and the strength of the processed end 5 can be improved. Its practical effects are enormous.
【図1】本発明に係るアンカーボルトの製造方法示す工
程図である。FIG. 1 is a process chart showing a method for manufacturing an anchor bolt according to the present invention.
【図2】アンカーボルトのボルト部の加工状態の過程を
示す正面図である。FIG. 2 is a front view showing a process of machining a bolt portion of the anchor bolt.
【図3】図1(c) の端部拡大図である。FIG. 3 is an enlarged end view of FIG. 1 (c).
【図4】アンカーボルトの母材の詳細な形態を表した正
面図である。FIG. 4 is a front view showing a detailed form of a base material of the anchor bolt.
1 アンカーボルト 2 基形部 3、3a… 表面突部 5 加工端部 6 雄ネジ DESCRIPTION OF SYMBOLS 1 Anchor bolt 2 Base part 3, 3a ... Surface projection 5 Processing end 6 Male thread
フロントページの続き (58)調査した分野(Int.Cl.6,DB名) B21K 1/00 - 31/00 B21H 1/00 - 9/02 B21J 1/00 - 13/14 B21J 17/00 - 19/04 E02D 27/00Continuation of the front page (58) Field surveyed (Int. Cl. 6 , DB name) B21K 1/00-31/00 B21H 1/00-9/02 B21J 1/00-13/14 B21J 17/00-19 / 04 E02D 27/00
Claims (2)
するアンカーボルトであって、アンカーボルト端部の表
面突部のみを冷間塑性加工により、略平坦化する様に変
形させて、かかる加工端部をアンカーボルトの基形部と
略同径な略円柱形に形成した後に、ネジ転造による冷間
塑性加工により、前記加工端部に雄ネジを形成したこと
を特徴とするアンカーボルト。1. An anchor bolt having a surface projection such as a brush and a rib on its surface, wherein only the surface projection at the end of the anchor bolt is deformed by cold plastic working so as to be substantially flattened. An anchor bolt having a machined end formed in a substantially cylindrical shape having substantially the same diameter as the base portion of the anchor bolt, and then forming an external thread on the machined end by cold plastic working by thread rolling. .
するアンカーボルトの製造方法であって、アンカーボル
ト端部の表面突部のみを冷間塑性加工により、略平坦化
する様に変形させて、かかる加工端部をアンカーボルト
の基形部と略同径な略円柱形に形成する工程と、ネジ転
造による冷間塑性加工により、前記加工端部に雄ネジを
形成する工程から成り、加工端部の強度を母材強度以上
にすることを特徴とするアンカーボルトの製造方法。2. A method of manufacturing an anchor bolt having a surface projection such as a brush and a rib on a surface, wherein only a surface projection at an end of the anchor bolt is deformed to be substantially flat by cold plastic working. Forming a working end portion into a substantially cylindrical shape having substantially the same diameter as the base portion of the anchor bolt, and forming a male screw at the working end portion by cold plastic working by thread rolling. A method of manufacturing an anchor bolt, wherein the strength of a processed end portion is equal to or higher than the base material strength.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21427896A JP2860472B2 (en) | 1996-07-24 | 1996-07-24 | Anchor bolt and method of manufacturing the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21427896A JP2860472B2 (en) | 1996-07-24 | 1996-07-24 | Anchor bolt and method of manufacturing the same |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH1037206A JPH1037206A (en) | 1998-02-10 |
JP2860472B2 true JP2860472B2 (en) | 1999-02-24 |
Family
ID=16653091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21427896A Expired - Lifetime JP2860472B2 (en) | 1996-07-24 | 1996-07-24 | Anchor bolt and method of manufacturing the same |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2860472B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3695157B2 (en) * | 1998-07-10 | 2005-09-14 | 日鐵建材工業株式会社 | Unbonded anchor bolt with exposed column base |
GB2390047B (en) * | 2002-06-28 | 2005-05-11 | Textron Fastening Syst Ltd | Split die groove maker |
JP5486269B2 (en) * | 2009-11-12 | 2014-05-07 | 日立機材株式会社 | Anchor bolt for column base |
-
1996
- 1996-07-24 JP JP21427896A patent/JP2860472B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH1037206A (en) | 1998-02-10 |
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