JPS6144582B2 - - Google Patents
Info
- Publication number
- JPS6144582B2 JPS6144582B2 JP53070626A JP7062678A JPS6144582B2 JP S6144582 B2 JPS6144582 B2 JP S6144582B2 JP 53070626 A JP53070626 A JP 53070626A JP 7062678 A JP7062678 A JP 7062678A JP S6144582 B2 JPS6144582 B2 JP S6144582B2
- Authority
- JP
- Japan
- Prior art keywords
- bolt
- tip
- head
- shaft
- fixing jig
- 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
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
Landscapes
- Forging (AREA)
Description
【発明の詳細な説明】
本発明は、ボルトの製造方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a bolt.
従来のボルトにおいては、ボルトを挿着部に螺
着しやすいようにボルトの軸部先端部に先端に向
けて径が漸小したテーパー部が設けられている
が、かかるテーパー部を設けるために、ボルト材
の軸部周縁にねじ溝を圧造する前に、軸部先端部
を圧造あるいは切削していた。 In conventional bolts, a tapered part is provided at the tip of the shaft of the bolt so that the bolt can be easily screwed into the insertion part, and the diameter gradually decreases toward the tip. Before forming the thread groove on the periphery of the shaft of the bolt material, the tip of the shaft was pressed or cut.
本発明は、ボルト材の軸部先端部にテーパー部
を設けるための工程を省き、軸部周縁にねじ溝を
圧造する工程において同時にテーパー部を形成す
ることを目的とし、更にボルト材の軽量化および
ボルト頭の形状精度の向上を目的とするものであ
り、しかして本発明は固定用治具の孔部にボルト
材を挿入してボルト材先端面を支持棒により支持
し、該固定用治具より外出したボルト材頭端面を
ハンマーによつて打撃することによつてボルト材
を変形せしめ、ボルト材先端面には支持棒の先端
に突出せしめられた突起に対応する形状の凹部を
形成せしめ、同時にボルト材頭部には固定用治具
の上面に孔部に連続して設けられたボルト頭型に
よりボルト頭を形成し、次いでボルト材軸部周縁
にねじ溝を圧造する際、ねじ溝具の押圧力により
該凹部の周壁を内方に彎曲せしめることにより軸
部先端部にテーパー部を形成することを骨子とす
るものである。 The present invention aims to omit the process of providing a tapered part at the tip of the shaft of a bolt material, and to form the tapered part at the same time in the process of forging a thread groove on the periphery of the shaft, and further to reduce the weight of the bolt material. The purpose of the present invention is to insert the bolt material into the hole of the fixing jig, support the front end surface of the bolt material with a support rod, and improve the shape accuracy of the bolt head. The bolt material is deformed by hitting the end surface of the bolt material protruding from the tool with a hammer, and a recess in a shape corresponding to the protrusion projected at the tip of the support rod is formed on the bolt material end surface. At the same time, the bolt head is formed by a bolt head mold that is continuous with the hole on the top surface of the fixing jig, and then when a thread groove is forged around the periphery of the bolt shaft, the thread groove is formed. The main idea is to form a tapered portion at the tip of the shaft by bending the circumferential wall of the recess inward by the pressing force of the tool.
本発明を図に示す一実施例により説明すると、
棒状のボルト材１を固定用治具２の孔部２Ａに挿
入してボルト材１の先端面１Ａを支持棒３によつ
て支持し、固定用治具２より外出したボルト材１
の頭端面１Ｂをハンマー４によつて打撃する。ボ
ルト材１は、ハンマー４の打撃によつて変形せし
められ、ボルト材１の先端面１Ａには支持棒３の
先端に突出せしめられた半球状の突起３Ａに対応
する形状の凹部１Ｃが形成せしめられ、ボルト材
１の頭部には固定用治具２の上面に孔部２Ａに連
続して設けられたボルト頭型２Ｂによりボルト頭
１Ｄが形成せしめられる。この際凹部１Ｃ部分の
形成によりボルト材１材料に逃げが生じ、ボルト
材１はハンマー４と支持棒３によつて伸びが抑制
されているから上記材料の逃げはボルト頭１Ｄ部
分の放射状の張りとして発現してボルト頭１Ｄの
形状精度が大きく向上する。次いで、ねじ溝具５
によつてボルト材１の軸部１Ｅ周縁がねじ溝１Ｆ
が圧造されてボルト１′が得られるが、この際ね
じ溝具５の押圧力によつてボルト材１の凹部１Ｃ
の周壁は内方に彎曲せしめられ、従つてボルト
１′の軸部１Ｅ先端部には先端に向けて径が漸小
したテーパー部１Ｇが形成せしめられる。 The present invention will be explained with reference to an embodiment shown in the drawings.
A rod-shaped bolt material 1 is inserted into the hole 2A of the fixing jig 2, the tip end surface 1A of the bolt material 1 is supported by the support rod 3, and the bolt material 1 is removed from the fixing jig 2.
The head end face 1B of is struck by the hammer 4. The bolt material 1 is deformed by the impact of the hammer 4, and a recess 1C having a shape corresponding to the hemispherical protrusion 3A projected from the tip of the support rod 3 is formed on the tip end surface 1A of the bolt material 1. A bolt head 1D is formed on the head of the bolt material 1 by a bolt head mold 2B provided on the upper surface of the fixing jig 2 so as to be continuous with the hole 2A. At this time, the formation of the concave portion 1C causes relief in the bolt material 1 material, and since the elongation of the bolt material 1 is suppressed by the hammer 4 and the support rod 3, the material relief occurs due to the radial tension of the bolt head 1D portion. As a result, the shape accuracy of the bolt head 1D is greatly improved. Next, the screw groove tool 5
Due to this, the periphery of the shaft portion 1E of the bolt material 1 is threaded into the thread groove 1F.
is pressed to obtain the bolt 1', but at this time, the concave portion 1C of the bolt material 1 is
The circumferential wall of the bolt 1' is curved inward, so that the tip of the shaft portion 1E of the bolt 1' is formed with a tapered portion 1G whose diameter gradually decreases toward the tip.
本発明は、上記のように最初の工程において固
定用治具に挿入されたボルト材の頭端面をハンマ
ーによつて打撃することによつてボルト頭を形成
すると同時にボルト材の先端面に凹部を形成し、
次の工程においてねじ溝具によりボルト材の軸部
周縁にねじ溝を圧造する際、ねじ溝具の押圧力に
よつてボルト材の凹部周壁を内方に彎曲せしめて
軸部先端部にテーパー部を設けるものであるか
ら、凹部形成に帰因する材料の逃げによつてボル
ト頭の形状に張りを生じて形状精度が大きく向上
し、また特にテーパー部を設けるための工程を必
要とせず、従つて製造工程が簡略化され大量生産
には非常に有利なものであり、ボルトの製造コス
トも下がる。 As described above, the present invention forms a bolt head by hitting the head end surface of the bolt material inserted into the fixing jig with a hammer in the first step, and at the same time forms a recess in the front end surface of the bolt material. form,
In the next step, when forming a thread groove on the periphery of the shaft of the bolt material using a thread groove tool, the pressing force of the thread groove tool causes the circumferential wall of the concave portion of the bolt material to curve inward, creating a tapered part at the tip of the shaft. Since the material escapes due to the formation of the recess, tension is created in the shape of the bolt head, greatly improving the shape accuracy, and there is no need for a process to provide a tapered part, making it possible to This simplifies the manufacturing process, which is very advantageous for mass production, and reduces the manufacturing cost of bolts.
また、本発明によるボルトは軸部先端面に凹部
を形成されているから、その分だけ材料が節約で
き、更に軽量となるので、取扱いが有利となる。 Further, since the bolt according to the present invention has a concave portion formed on the tip end surface of the shaft portion, material can be saved by that much, and the bolt is also lightweight, making it easier to handle.
図面は、本発明の一実施例を示すものであり、
第１図は一製造工程を示す一部省略一部切欠正面
図、第２図は正面図、第３図は他の製造工程を示
す一部切欠正面図、第４図は正面図である。
図中、１……ボルト材、１′……ボルト、１Ａ
……先端面、１Ｂ……頭端面、１Ｃ……凹部、１
Ｄ……ボルト頭、１Ｅ……軸部、１Ｆ……ねじ
溝、１Ｇ……テーパー部、２……固定用治具、２
Ａ……孔部、２Ｂ……ボルト頭型、３……支持
棒、３Ａ……突起、４……ハンマー、５……ねじ
溝具。
The drawings illustrate one embodiment of the invention,
FIG. 1 is a partially cutaway front view showing one manufacturing process, FIG. 2 is a front view, FIG. 3 is a partially cutaway front view showing another manufacturing process, and FIG. 4 is a front view. In the diagram, 1... Bolt material, 1'... Bolt, 1A
... Tip surface, 1B ... Head end surface, 1C ... Concavity, 1
D...Bolt head, 1E...Shaft part, 1F...Thread groove, 1G...Tapered part, 2...Fixing jig, 2
A...hole, 2B...bolt head type, 3...support rod, 3A...protrusion, 4...hammer, 5...screw groove tool.
Claims (1)
ト材先端面を支持棒により支持し、該固定用治具
より外出したボルト材頭端面をハンマーによつて
打撃することによつてボルト材を変形せしめ、ボ
ルト材先端面には支持棒の先端に突出せしめられ
た突起に対応する形状の凹部を形成せしめ、同時
にボルト材頭部には固定用治具の上面に孔部に連
続して設けられたボルト頭型によりボルト頭を形
成し、次いでボルト材軸部周縁にねじ溝を圧造す
る際、ねじ溝具の押圧力により該凹部の周壁を内
方に彎曲せしめることにより軸部先端部にテーパ
ー部を形成することを特徴とするボルトの製造方
法。1. Insert the bolt material into the hole of the fixing jig, support the bolt end face with a support rod, and hit the bolt head end face protruding from the fixing jig with a hammer to tighten the bolt. By deforming the material, a concave portion having a shape corresponding to the protrusion projected from the tip of the support rod is formed on the tip surface of the bolt material, and at the same time, a concave portion is formed in the head of the bolt material that is continuous with the hole on the top surface of the fixing jig. When forming a bolt head using the bolt head mold provided in the bolt head mold, and then forming a thread groove on the periphery of the bolt shaft, the peripheral wall of the recess is curved inward by the pressing force of the thread groove tool, thereby forming the tip of the shaft. A method for producing a bolt, the method comprising forming a tapered part in the bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7062678A JPS55130354A (en) | 1978-06-12 | 1978-06-12 | Bolt and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7062678A JPS55130354A (en) | 1978-06-12 | 1978-06-12 | Bolt and its production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55130354A JPS55130354A (en) | 1980-10-09 |
| JPS6144582B2 true JPS6144582B2 (en) | 1986-10-03 |
Family
ID=13437013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7062678A Granted JPS55130354A (en) | 1978-06-12 | 1978-06-12 | Bolt and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55130354A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101927311A (en) * | 2010-07-15 | 2010-12-29 | 宏茂五金(昆山)有限公司 | Cold upsetting forming die of slender bolt |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4315001Y1 (en) * | 1964-05-18 | 1968-06-24 |
-
1978
- 1978-06-12 JP JP7062678A patent/JPS55130354A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4315001Y1 (en) * | 1964-05-18 | 1968-06-24 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55130354A (en) | 1980-10-09 |
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