JP2001252737A - Manufacturing method of bolt - Google Patents
Manufacturing method of boltInfo
- Publication number
- JP2001252737A JP2001252737A JP2000065600A JP2000065600A JP2001252737A JP 2001252737 A JP2001252737 A JP 2001252737A JP 2000065600 A JP2000065600 A JP 2000065600A JP 2000065600 A JP2000065600 A JP 2000065600A JP 2001252737 A JP2001252737 A JP 2001252737A
- Authority
- JP
- Japan
- Prior art keywords
- coarse
- fine
- bolt
- screw portion
- thread
- 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.)
- Withdrawn
Links
Landscapes
- Forging (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ボルトの基材であ
る円柱状材料に並目螺子部と細目螺子部とを形成するボ
ルトの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a bolt in which a coarse thread portion and a fine thread portion are formed on a cylindrical material which is a base material of the bolt.
【０００２】[0002]
【従来の技術】近年、弛み防止機能を有するボルトの製
造方法が研究・開発されている。従来のボルトの製造方
法として、例えば、特開平１１-２５４０７２号公報
（以下、イ号公報という）には、「平板の表面に、相互
に交差する右ねじと左ねじを平面状に展開した平面状ね
じ山を形成し、前記表面を内側に向けて平行に相対する
１対の平板の間に円柱状材料を挿入し、該円柱状材料を
狭圧しながら少なくとも一方の前記平板を移動して、前
記円柱状材料の外周面に相互に交差する右、左ねじを螺
設することを特徴とする右、左ねじの転造方法」が開示
されている。2. Description of the Related Art In recent years, methods for manufacturing bolts having a slack preventing function have been researched and developed. As a conventional bolt manufacturing method, for example, Japanese Patent Application Laid-Open No. H11-254072 (hereinafter referred to as “A”) discloses a method in which “a right-handed screw and a left-handed screw that cross each other are developed on a flat plate surface. Forming a thread, inserting a columnar material between a pair of flat plates facing in parallel with the surface facing inward, moving at least one of the flat plates while narrowing the cylindrical material, A method for rolling right and left screws, characterized by screwing right and left screws that cross each other on the outer peripheral surface of the cylindrical material, is disclosed.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら上記従来
のボルトの製造方法では、以下のような課題を有してい
た。 （１）右ねじ及び左ねじのピッチの内何れか一方が他方
の偶数倍になっていないので、一方のねじの螺子山に対
して他方のねじの谷が無作為に螺設されてしまい、製造
された右、左ねじの見栄えが悪くなりるとともに、目視
で製品を検査しにくくなり不良品を発見しにくいという
課題を有していた。 （２）右ねじ及び左ねじの内、右、左ねじの先端部側に
螺設される方のリード角が他方のリード角より小さいこ
とが記載されておらず、先端部側に螺設されたねじの方
がリード角が大きい場合は、同角度の回転に対して、他
方のねじに螺合しているナットの移動距離より、先端部
側に螺設されたねじに螺合しているナットの移動距離の
方が大きいので、弛みやすく、締結力に欠けるとともに
安全性に欠けるという課題を有していた。 上記課題を解決するために、１つのボルトにピッチの異
なる細目螺子部と並目螺子部を形成したものが開発さ
れ、並目螺子部に並目ナットを締結し、その弛みを防止
するために、細目螺子部に細目ナットを締結することに
より、極めて高い締結力が得られることがわかった。し
かしながら、このボルトの製造方法はいまだ開示されて
おらず、極めて強く開示が要求されていた。However, the conventional method for manufacturing a bolt has the following problems. (1) Since either one of the pitches of the right-hand thread and the left-hand thread is not an even multiple of the other, the valley of the other thread is randomly screwed with respect to the thread of one thread, The manufactured right and left screws have problems that the appearance of the left and right screws is deteriorated, and that it is difficult to visually inspect the products and to find defective products. (2) Of the right-handed screws and left-handed screws, it is not described that the lead angle of the right-handed or left-handed screw, which is screwed on the tip end side, is smaller than the other lead angle, and is screwed on the tip end side. When the lead screw has a larger lead angle, it is screwed into the screw threaded on the tip side due to the movement distance of the nut screwed to the other screw for the same angle of rotation. Since the moving distance of the nut is longer, it has a problem that it is easy to loosen, lacks fastening force and lacks safety. In order to solve the above-mentioned problem, a bolt in which a fine thread portion and a coarse thread portion having different pitches are formed on one bolt has been developed, and a coarse nut is fastened to the coarse thread portion to prevent loosening thereof. It has been found that an extremely high fastening force can be obtained by fastening the fine nut to the fine screw portion. However, a method of manufacturing the bolt has not been disclosed yet, and the disclosure has been extremely strongly required.
【０００４】本発明は上記従来の要求を解決するもの
で、低原価で量産可能であり、大きな振動荷重を受けて
も螺合しているナットが弛みにくいボルトの製造方法を
提供することを目的とする。An object of the present invention is to solve the above-mentioned conventional demands, and to provide a method of manufacturing a bolt which can be mass-produced at low cost and in which a screwed nut is not easily loosened even under a large vibration load. And
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に本発明のボルトの製造方法は、ボルトの基材である円
柱状材料の先端部から所定部まで切削又は転造によりピ
ッチＰの並目螺子部を形成する並目螺子部形成工程と、
少なくとも前記円柱状材料の先端部から前記並目螺子部
の所定部まで、ピッチｐ（ｐ＝Ｐ／２ｎ，ｎ＝自然数）
の細目螺子部を切削又は転造により形成する細目螺子部
形成工程と、を備えた構成を有する。In order to solve the above-mentioned problems, a method of manufacturing a bolt according to the present invention is directed to a method of manufacturing a bolt, wherein a pitch P is formed by cutting or rolling from a tip end portion of a cylindrical material as a base material of the bolt to a predetermined portion. A coarse screw part forming step of forming the eye screw part,
A pitch p (p = P / 2n, n = natural number) from at least the tip of the columnar material to a predetermined portion of the coarse screw portion.
And a fine screw portion forming step of forming the fine screw portion by cutting or rolling.
【０００６】この構成により、低原価で量産可能であ
り、見栄えが良く、大きな振動荷重を受けても螺合して
いるナットが弛みにくいボルトの製造方法を提供するこ
とができる。According to this configuration, it is possible to provide a method of manufacturing a bolt which can be mass-produced at low cost, has a good appearance, and does not loosen a screwed nut even under a large vibration load.
【０００７】また、本発明のボルトの製造方法は、ボル
トの基材である円柱状材料の先端部から所定部まで形成
されるピッチＰの並目螺子部と少なくとも前記円柱状材
料の先端部から前記並目螺子部の所定部まで形成される
ピッチｐ（ｐ＝Ｐ／２ｎ，ｎ＝自然数）の細目螺子部と
を転造により同時に形成する転造工程を備えた構成を備
えた構成を有する。Further, the method of manufacturing a bolt according to the present invention is characterized in that a coarse threaded portion having a pitch P formed from a leading end of a cylindrical material as a base material of the bolt to a predetermined portion and at least a leading end of the cylindrical material are formed. It has a configuration provided with a configuration including a rolling step of simultaneously forming a fine thread portion having a pitch p (p = P / 2n, n = natural number) formed up to a predetermined portion of the coarse thread portion by rolling. .
【０００８】この構成により、一工程（転造工程）のみ
で並目螺子部と細目螺子部とを同時に形成することがで
きるので、低原価で量産可能であるとともに作業性に優
れ、見栄えが良く、大きな振動荷重を受けても螺合して
いるナットが弛みにくいボルトの製造方法を提供すると
ができる。According to this configuration, the coarse thread portion and the fine thread portion can be simultaneously formed in only one process (rolling process), so that mass production can be performed at low cost, workability is excellent, and appearance is good. Further, it is possible to provide a method for manufacturing a bolt in which a nut that is screwed therein is not easily loosened even under a large vibration load.
【０００９】[0009]
【発明の実施の形態】この目的を達成するために本発明
の請求項１に記載のボルトの製造方法は、ボルトの基材
である円柱状材料の先端部から所定部まで切削又は転造
によりピッチＰの並目螺子部を形成する並目螺子部形成
工程と、少なくとも前記円柱状材料の先端部から前記並
目螺子部の所定部まで、ピッチｐ（ｐ＝Ｐ／２ｎ，ｎ＝
自然数）の細目螺子部を切削又は転造により形成する細
目螺子部形成工程と、を備えた構成としたものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to achieve this object, a method for manufacturing a bolt according to claim 1 of the present invention is to cut or roll from a tip portion of a cylindrical material as a base material of the bolt to a predetermined portion. Forming a coarse thread portion having a pitch P, and a pitch p (p = P / 2n, n = p) at least from a tip end of the columnar material to a predetermined portion of the coarse thread portion.
(A natural number) of fine screw portions formed by cutting or rolling.
【００１０】この構成により、以下のような作用が得ら
れる。 （１）並目螺子部のピッチＰは、細目螺子部のピッチｐ
の偶数倍なので、並目螺子部の螺子山における細目螺子
部の谷部がボルトの軸に対して平行に存在するので、見
栄えが良く、ボルト完成後に目視による検査が容易であ
り不良品を発見しやすいボルトを製造できる。 （２）二工程（並目螺子部形成工程及び細目螺子部形成
工程）のみで並目螺子部及び細目螺子部が形成されるの
で、低原価で量産可能であり、作業性に優れる。With this configuration, the following operation can be obtained. (1) The pitch P of the coarse thread is the pitch p of the fine thread.
Since the valley of the fine thread in the thread of the coarse thread is parallel to the axis of the bolt, the appearance is good, the visual inspection is easy after the bolt is completed, and defective products are found. Bolts that can be easily manufactured can be manufactured. (2) Since the coarse screw portion and the fine screw portion are formed in only two steps (the coarse screw portion forming process and the fine screw portion forming process), mass production can be performed at low cost and workability is excellent.
【００１１】本発明の請求項２に記載のボルトの製造方
法は、ボルトの基材である円柱状材料の先端部から所定
部まで形成されるピッチＰの並目螺子部と少なくとも前
記円柱状材料の先端部から前記並目螺子部の所定部まで
形成されるピッチｐ（ｐ＝Ｐ／２ｎ，ｎ＝自然数）の細
目螺子部とを転造により同時に形成する転造工程を備え
た構成としたものである。According to a second aspect of the present invention, in the method for manufacturing a bolt, a coarse thread portion having a pitch P formed from a front end portion to a predetermined portion of a cylindrical material as a base material of the bolt and at least the cylindrical material is provided. And a fine thread portion having a pitch p (p = P / 2n, n = natural number) formed from the tip portion to the predetermined portion of the coarse thread portion at the same time by rolling. Things.
【００１２】この構成により、以下のような作用が得ら
れる。 （１）並目螺子部のピッチＰは、細目螺子部のピッチｐ
の偶数倍なので、並目螺子部の螺子山における細目螺子
部の谷部がボルトの軸に対して平行に存在するので、見
栄えが良く、ボルト完成後に目視による検査が容易であ
り不良品を発見しやすいボルトを製造できる。 （２）一工程（転造工程）のみで並目螺子部及び細目螺
子部が形成されるので、低原価で量産可能であり、作業
性に優れる。ここで、転造の方法としては、平ダイスを
用いる方法、丸ダイスを用いる方法などが用いられる。
平ダイス及び丸ダイスの形状としては、対向して配設さ
れたダイスの一方に並目螺子部が形成され他方に細目螺
子部が形成された形状、対向して配設されたダイスの両
方に並目螺子部及び細目螺子部が一体に形成された形状
などが用いられる。With this configuration, the following operation is obtained. (1) The pitch P of the coarse thread is the pitch p of the fine thread.
Since the valley of the fine thread in the thread of the coarse thread is parallel to the axis of the bolt, the appearance is good, the visual inspection is easy after the bolt is completed, and defective products are found. Bolts that can be easily manufactured can be manufactured. (2) Since the coarse thread portion and the fine thread portion are formed only by one process (rolling process), mass production can be performed at low cost and workability is excellent. Here, as a method of rolling, a method using a flat die, a method using a round die, and the like are used.
As the shape of the flat die and the round die, both of the dice arranged opposite to each other have a coarse screw part formed on one side and a fine screw part formed on the other, and the dice arranged opposite to each other. A shape in which the coarse thread portion and the fine thread portion are integrally formed is used.
【００１３】本発明の請求項３に記載の発明は、請求項
１又は２に記載のボルトの製造方法であって、前記細目
螺子部の螺子山の条数が、前記並目螺子部の螺子山の条
数以下である構成としたものである。According to a third aspect of the present invention, there is provided the method of manufacturing a bolt according to the first or second aspect, wherein the number of threads of the fine thread is less than the number of threads of the coarse thread. The configuration is such that the number is equal to or less than the number of the mountain.
【００１４】この構成により、請求項１又は２の作用に
加え、以下のような作用が得られる。 （１）並目螺子部に並目ナットを螺合させた後、細目螺
子部に細目ナットを螺合させた場合、細目螺子部のリー
ド角が並目螺子部のリード角より小さいので、同一回転
角度に対する細目ナットの移動距離は並目ナットのそれ
より小さくなる。よって、並目ナットが弛み方向に回転
し、被締結体から離れようとしても、細目ナットは並目
ナットより速く移動することができないので、並目ナッ
トは細目ナットに常に弛み方向への回転を抑制された状
態となり、弛みにくいボルトを製造することができるボ
ルトを製造することができる。With this configuration, the following operation can be obtained in addition to the operation of the first or second aspect. (1) If a fine nut is screwed into a fine screw after a coarse nut is screwed into a coarse screw, the lead angle of the fine screw is smaller than the lead angle of the coarse screw. The moving distance of the fine nut with respect to the rotation angle is smaller than that of the coarse nut. Therefore, even if the coarse nut rotates in the loosening direction and tries to move away from the object to be fastened, the fine nut cannot move faster than the coarse nut, so the coarse nut always rotates the fine nut in the loosening direction. It is possible to manufacture a bolt that can be manufactured in a state where the bolt is suppressed and hardly loosened.
【００１５】本発明の請求項４に記載の発明は、請求項
１乃至３の内何れか一項に記載の発明であって、前記並
目螺子部の谷の径（ボルトと同軸で谷底に接する仮想的
な円筒の直径）が、前記細目螺子部の谷の径より小さい
構成としたものである。The invention according to claim 4 of the present invention is the invention according to any one of claims 1 to 3, wherein the diameter of the valley of the coarse screw portion (coaxial with the bolt, the valley bottom) (The diameter of a virtual cylinder in contact with the thread) is smaller than the diameter of the valley of the fine screw portion.
【００１６】この構成により、請求項１乃至３の内何れ
か一項の作用に加え、以下のような作用が得られる。 （１）細目螺子部の谷底部（切除される部分）が浅いの
で、並目螺子部の山部に細目螺子部の谷底部が重なって
も並目螺子部の形状があまりかわらず、並目螺子部に螺
合するナットの締結力が弱まるのを防ぐことができるボ
ルトの製造することができる。With this configuration, the following operation can be obtained in addition to the operation of any one of the first to third aspects. (1) Since the valley bottom (removed portion) of the fine screw portion is shallow, the shape of the coarse screw portion is not so large even if the valley bottom portion of the fine screw portion overlaps with the peak portion of the coarse screw portion. It is possible to manufacture a bolt that can prevent the fastening force of the nut screwed into the screw portion from weakening.
【００１７】本発明の請求項５に記載の発明は、請求項
１乃至４の内何れか一項に記載のボルトの製造方法であ
って、前記並目螺子部及び前記細目螺子部の螺子山の巻
き方向が、異なる構成としたものである。According to a fifth aspect of the present invention, there is provided a method of manufacturing a bolt according to any one of the first to fourth aspects, wherein the coarse thread portion and the fine thread portion are provided with a screw thread. Have different winding directions.
【００１８】この構成により、請求項１乃至４の内何れ
か一項の作用に加え、以下のような作用が得られる。 （１）細目螺子部に螺合するナットの弛み方向（回転方
向）は、並目螺子部に螺合するナットの弛み方向（回転
方向）と異なるので、弛みにくく締結力が強く安全性に
優れるボルトを製造することができる。According to this configuration, the following operation is obtained in addition to the operation of any one of the first to fourth aspects. (1) Since the loosening direction (rotation direction) of the nut screwed into the fine screw portion is different from the loosening direction (rotation direction) of the nut screwed into the coarse screw portion, the nut is hardly loosened and the fastening force is strong and the safety is excellent. Bolts can be manufactured.
【００１９】以下に本発明の一実施の形態について、図
面を参照しながら説明する。 （実施の形態１）図１は本発明の実施の形態１における
ボルトの製造方法により製造されるボルトの使用状態を
示す説明図である。図１において、１は本実施の形態１
において製造されるボルト、２はボルト１の胴部である
円柱状材料、３は冷間鍛造等により形成されたボルト１
のボルト頭部、４は切削又は転造により円柱状材料２の
先端部から所定部までピッチＰで形成された並目螺子
部、５は円柱状材料２の先端部から並目螺子部４の所定
部まで切削又は転造によりピッチｐで形成された細目螺
子部であり、ピッチｐはピッチＰの１／２ｎ倍である
（ｎは自然数）。また、並目螺子部４と細目螺子部５の
条数は等しい。６は第１の被締結体、７は第１の被締結
体６にボルト１によって締結された第２の被締結体であ
り、ボルト１は第１の被締結体６及び第２の被締結体７
に貫通して配設されている。８は第１の被締結体６に当
接しボルト１の先端部側が貫挿された座金、９はボルト
１の並目螺子部４に螺合されピッチＰのめねじが形成さ
れた並目ナット、１０はボルト１の細目螺子部５に螺合
されピッチｐのめねじが形成されたた細目ナットであ
る。図２（ａ）は図１におけるＡ部の拡大図であり、図
２（ｂ）は図１におけるＢ部の拡大図である。図２にお
いて、１はボルト、４は並目螺子部、５は細目螺子部、
９は並目ナット、１０は細目ナットであり、これらは図
１と同様のものなので同一の符号を付してその説明を省
略する。４ａは並目螺子部４のねじ山の頂部、４ｂは並
目螺子部４の谷底部、４ｃは並目螺子部４のフランク、
５ａは細目螺子部５の谷底部、Ｐは並目螺子部４のピッ
チ、ｐは細目螺子部５のピッチであり、ｐ＝Ｐ／２ｎ
（ｎは自然数、本実施の形態においてはｎ＝１）であ
る。並目螺子部４の谷の径は、細目螺子部５の谷の径よ
り小さく形成されている。１１は細目螺子部５を形成す
るために、並目螺子部４の一部が転造装置や旋盤装置な
どにより削除された削除部である。図３は並目螺子部の
頂部と細目螺子部の谷底部との位置関係を示す説明図で
ある。図３において、２は円柱状材料、４ａは並目螺子
部のねじ山の頂部、５ａは細目螺子部５の谷底部であ
り、これらは、図２と同様のものであるので、同一の符
号を付してその説明を省略する。図３より、並目螺子部
のピッチＰは、細目螺子部のピッチｐの偶数倍なので、
並目螺子部の頂部４ａにおける細目螺子部の谷底部５ａ
（実線４ａと破線５ａの交点）が円柱状材料２の軸方向
に対して平行に存在することがわかる。An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is an explanatory view showing a use state of a bolt manufactured by a method for manufacturing a bolt according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes the first embodiment.
2 is a columnar material that is the body of the bolt 1, and 3 is a bolt 1 formed by cold forging or the like.
The bolt head 4 has a coarse thread portion formed at a pitch P from the tip of the columnar material 2 to a predetermined portion by cutting or rolling, and 5 has a coarse thread portion 4 from the tip of the columnar material 2. It is a fine thread portion formed at a pitch p by cutting or rolling to a predetermined portion, and the pitch p is 1 / 2n times the pitch P (n is a natural number). Further, the number of threads of the coarse screw portion 4 and the fine screw portion 5 are equal. Reference numeral 6 denotes a first object to be fastened, 7 denotes a second object to be fastened to the first object to be fastened 6 by a bolt 1, and the bolt 1 comprises a first object to be fastened 6 and a second object to be fastened. Body 7
It is arranged to pass through. Reference numeral 8 denotes a washer in contact with the first fastened member 6 and through which the distal end of the bolt 1 is inserted. Reference numeral 9 denotes a coarse nut which is screwed into the coarse screw portion 4 of the bolt 1 and has a female thread having a pitch P. Reference numeral 10 denotes a fine nut which is screwed to the fine screw portion 5 of the bolt 1 and is formed with a female screw having a pitch p. FIG. 2A is an enlarged view of a portion A in FIG. 1, and FIG. 2B is an enlarged view of a portion B in FIG. In FIG. 2, 1 is a bolt, 4 is a coarse thread, 5 is a fine thread,
Reference numeral 9 denotes a coarse nut, and 10 denotes a fine nut, which are the same as those in FIG. 1 and are denoted by the same reference numerals and description thereof is omitted. 4a is the top of the thread of the coarse thread portion 4, 4b is the root of the coarse thread portion 4, 4c is the flank of the coarse thread portion 4,
5a is the root of the fine screw portion 5, P is the pitch of the coarse screw portion 4, p is the pitch of the fine screw portion 5, and p = P / 2n
(N is a natural number, n = 1 in the present embodiment). The diameter of the valley of the coarse screw portion 4 is formed smaller than the diameter of the valley of the fine screw portion 5. Reference numeral 11 denotes a deleted portion in which a part of the coarse screw portion 4 is deleted by a rolling device, a lathe device, or the like in order to form the fine screw portion 5. FIG. 3 is an explanatory diagram showing the positional relationship between the top of the coarse screw portion and the bottom of the fine screw portion. In FIG. 3, 2 is a columnar material, 4a is the top of the thread of the coarse thread, 5a is the root of the fine thread 5, and these are the same as those in FIG. And the description is omitted. From FIG. 3, since the pitch P of the coarse screw portion is an even multiple of the pitch p of the fine screw portion,
Bottom part 5a of fine screw part at top part 4a of coarse screw part
It can be seen that (the intersection of the solid line 4a and the broken line 5a) exists parallel to the axial direction of the columnar material 2.
【００２０】以上のように構成されたボルトの製造方法
について、図面を参照しながら説明する。図４（ａ）は
並目螺子部が切削により形成されていく状態を示した説
明図であり、図４（ｂ）は細目螺子部が切削により形成
されていく状態を示した説明図である。図４において、
２は円柱状材料、４は並目螺子部、４ａは頂部、４ｂは
谷底部、４ｃはフランク、５は細目螺子部、５ａは谷底
部であり、これらは図２と同様のものなので同一の符号
を付してその説明を省略する。１２は旋盤装置（図示せ
ず）に取り付けられた並目螺子部切削用バイト、１３は
旋盤装置に取り付けられた細目螺子部切削用バイトであ
る。ボルト１を製造するには、円柱状材料２を旋盤装置
に取り付け、回転させながら軸方向に移動させる。その
際、円柱状材料２の側面が並目螺子部切削用バイト１２
により切削され並目螺子部４が形成される（並目螺子部
形成工程）。次いで、旋盤装置に細目螺子部切削用バイ
ト１３を取り付け、並目螺子部４が形成された円柱状材
料を回転させながら軸方向に移動させる。これにより、
並目螺子部４から削除部１１（図２参照）が取り除か
れ、細目螺子部５が形成されボルト１が製造される（細
目螺子部形成工程）。尚、本発明においては、旋盤装置
を用いてボルト１を製造したが、フライス盤や転造装置
を用いても同様に実施可能である。A method of manufacturing the bolt configured as described above will be described with reference to the drawings. FIG. 4A is an explanatory diagram showing a state in which coarse thread portions are formed by cutting, and FIG. 4B is an explanatory diagram showing a state in which fine thread portions are formed by cutting. . In FIG.
2 is a columnar material, 4 is a coarse thread portion, 4a is a top portion, 4b is a bottom portion, 4c is a flank, 5 is a fine thread portion, 5a is a bottom portion, and these are the same as those in FIG. The description is omitted by attaching the reference numerals. Reference numeral 12 denotes a coarse thread cutting bit attached to a lathe device (not shown), and reference numeral 13 denotes a fine thread cutting bit attached to the lathe device. In order to manufacture the bolt 1, the columnar material 2 is mounted on a lathe and moved in the axial direction while rotating. At this time, the side surface of the columnar material 2 has a coarse thread cutting bit 12.
To form the coarse screw portion 4 (coarse screw portion forming step). Next, the fine screw part cutting tool 13 is attached to the lathe apparatus, and the cylindrical material on which the coarse screw part 4 is formed is moved in the axial direction while rotating. This allows
The deleted portion 11 (see FIG. 2) is removed from the coarse screw portion 4, the fine screw portion 5 is formed, and the bolt 1 is manufactured (fine screw portion forming step). In the present invention, the bolt 1 is manufactured using a lathe apparatus, but the present invention can be similarly implemented using a milling machine or a rolling device.
【００２１】以上のように本実施の形態１におけるボル
トの製造方法は構成されているので、以下のような作用
を有する。 （１）並目螺子部４のピッチＰは、細目螺子部５のピッ
チｐの偶数倍なので、並目螺子部４の頂部４ａにおける
細目螺子部５の谷底部５ａがボルト１の軸方向に対して
平行に存在するので、見栄えが良く、ボルト１完成後に
目視による検査が容易であり不良品を発見しやすいボル
ト１を製造できる。 （２）細目螺子部５のリード角が並目螺子部４のリード
角より小さいので、同一回転角度に対する細目ナット１
０の移動距離は並目ナット９のそれより小さくなる。よ
って、並目ナット９が弛み方向に回転し、第１の被締結
体６から離れようとしても、細目ナット１０は並目ナッ
ト９より速く移動することができないので、並目ナット
９は細目ナット１０に常に弛み方向への回転を抑制され
た状態となり、弛みにくいボルト１を製造することがで
きる。 （３）細目螺子部５の谷底部５ａ（削除部１１）が浅い
ので、並目螺子部４の山部に細目螺子部５の谷底部５ａ
が重なっても並目螺子部４の形状があまりかわらず、並
目螺子部４に螺合する並目ナット９の締結力が弱まるの
を防ぐことができる。尚、本実施の形態１においては、
並目螺子部４と細目螺子部５の巻き方向が同一であるボ
ルトの製造方法について説明したが、該巻き方向が異な
るボルトも同様に製造可能である。As described above, the method for manufacturing a bolt according to the first embodiment has the following functions. (1) Since the pitch P of the coarse screw portion 4 is an even multiple of the pitch p of the fine screw portion 5, the bottom 5a of the fine screw portion 5 at the top 4a of the coarse screw portion 4 is positioned with respect to the axial direction of the bolt 1. Since the bolts 1 are parallel to each other, the bolts 1 have good appearance, can be easily visually inspected after the bolts 1 are completed, and can easily find defective products. (2) Since the lead angle of the fine screw portion 5 is smaller than the lead angle of the coarse screw portion 4, the fine nut 1 for the same rotation angle
The moving distance of 0 is smaller than that of the coarse nut 9. Therefore, even if the coarse nut 9 rotates in the loosening direction and tries to move away from the first workpiece 6, the fine nut 10 cannot move faster than the coarse nut 9. 10, the rotation in the slack direction is always suppressed, and the bolt 1 that is hard to loosen can be manufactured. (3) Since the bottom 5a (deleted portion 11) of the fine screw portion 5 is shallow, the bottom 5a of the fine screw portion 5 is formed on the crest of the coarse screw portion 4.
Even if they overlap, the shape of the coarse screw portion 4 does not change much, so that the fastening force of the coarse nut 9 screwed to the coarse screw portion 4 can be prevented from weakening. In the first embodiment,
Although the method of manufacturing a bolt having the same winding direction of the coarse screw portion 4 and the fine screw portion 5 has been described, bolts having different winding directions can be manufactured similarly.
【００２２】（実施の形態２）図５は本発明の実施の形
態２におけるボルトの製造方法を示す説明図であり、図
６（ａ）は並目平ダイスの並目螺子部側から視た平面図
であり、図６（ｂ）は図６（ａ）のＣ−Ｃ線における矢
視要部断面図であり、図７（ａ）は細目平ダイスの細目
螺子部側から視た平面図であり、図７（ｂ）は図７
（ａ）のＤ−Ｄ線における矢視要部断面図である。尚、
製造されるボルトは実施の形態１のボルト１と同様のも
のであるので、その説明を省略する。図５乃至図７にお
いて、２は円柱状材料であり、これは実施の形態１と同
様のものであるので、その説明を省略する。２１は平板
状の表面に並目螺子部２１ａが形成された並目平ダイ
ス、２２は並目平ダイス２１に一定間隔を挟んで対向し
て配設され平板状の表面に細目螺子部２２ｂが形成され
た細目平ダイスである。並目平ダイス２１と細目平ダイ
ス２２とは一方を固定し他方を平行移動可能に配設する
か、又は、相互に反対方向に平行移動可能に配設する。(Embodiment 2) FIG. 5 is an explanatory view showing a method of manufacturing a bolt according to Embodiment 2 of the present invention, and FIG. 6 (a) is viewed from a coarse screw portion side of a coarse flat die. FIG. 6B is a cross-sectional view taken along the line CC in FIG. 6A, and FIG. 7A is a plan view of the fine flat die viewed from the fine screw portion. FIG. 7 (b)
It is an arrow principal part sectional view in the DD line of (a). still,
The bolts to be manufactured are the same as the bolts 1 of the first embodiment, and the description thereof will be omitted. 5 to 7, reference numeral 2 denotes a columnar material, which is the same as in the first embodiment, and a description thereof will be omitted. Reference numeral 21 denotes a coarse flat die in which coarse screw portions 21a are formed on a flat surface, and reference numeral 22 denotes a fine flat screw portion 22b which is disposed opposite to the coarse flat die 21 with a predetermined interval therebetween. It is a fine-grain flat die formed. One of the coarse flat die 21 and the fine flat die 22 is fixed and the other is disposed so as to be movable in parallel, or is disposed so as to be movable in parallel in directions opposite to each other.
【００２３】ボルト１を製造するには、図５において、
並目平ダイス２１と細目平ダイス２２との間に円柱状材
料２を入れ、並目平ダイス２１を矢印Ｅ方向に平行移動
させると（又は、並目平ダイス２１と細目平ダイス２２
とを相互に反対方向に移動させると）、円柱状材料２
は、並目平ダイス２１及び細目平ダイス２２に挟圧され
並目螺子部４及び細目螺子部５を転造されながら、同方
向に転動する（転造工程）。これにより、円柱状材料２
は塑性変形し、外周面に並目螺子部４及び細目螺子部５
が形成されボルト１が製造される。In order to manufacture the bolt 1, in FIG.
When the columnar material 2 is put between the coarse flat die 21 and the fine flat die 22 and the coarse flat die 21 is translated in the direction of the arrow E (or the coarse flat die 21 and the fine flat die 22).
Are moved in opposite directions to each other).
Is rolled in the same direction while being pressed between the coarse flat die 21 and the fine flat die 22 while rolling the coarse screw portion 4 and the fine screw portion 5 (rolling step). Thereby, the columnar material 2
Is plastically deformed, and the coarse screw portion 4 and the fine screw portion 5 are formed on the outer peripheral surface.
Are formed, and the bolt 1 is manufactured.
【００２４】以上のように本実施の形態２におけるボル
トの製造方法は構成されているので、実施の形態１で得
られる作用に加え、以下のような作用を有する。 （１）並目平ダイス２１の並目螺子部２１ａと細目平ダ
イス２２の細目螺子部２２ａとが、同時に円柱状部材２
に転写される。よって、一工程（転造工程）のみで並目
螺子部４及び細目螺子部５を形成することができ、低原
価で量産可能であり、作業性に優れる 尚、本実施の形態においては、並目螺子部２１ａと細目
螺子部２２ａが各々別のダイスに形成されているものを
用いたが、並目螺子部と細目螺子部が一体に形成された
ダイスを用いても同様に実施可能である。As described above, the method for manufacturing a bolt according to the second embodiment is configured, and thus has the following operation in addition to the operation obtained in the first embodiment. (1) The coarse screw portion 21a of the coarse flat die 21 and the fine screw portion 22a of the fine flat die 22 are simultaneously formed in the columnar member 2.
Is transferred to Therefore, the coarse screw portion 4 and the fine screw portion 5 can be formed by only one process (rolling process), mass production can be performed at low cost, and workability is excellent. Although the one in which the eye screw portion 21a and the fine screw portion 22a are formed in different dies is used, the same can be implemented by using a die in which the coarse screw portion and the fine screw portion are integrally formed. .
【００２５】（実施の形態３）図８は本発明の実施の形
態３におけるボルトの製造方法を示す説明図である。
尚、製造されるボルトは実施の形態１と同様のものであ
るので、その説明を省略する。図８において、２は円柱
状材料であり、これは実施の形態１と同様のものである
ので、同一の符号を付してその説明を省略する。３１は
並目螺子部３１ａが円柱状の表面に形成された並目丸ダ
イス、３２は細目螺子部３２ａが円柱状の表面に形成さ
れた細目丸ダイス、３３は並目丸ダイス３１及び細目丸
ダイス３２の間に配設された円柱状材料支持部であり、
円柱状材料２が支持される。(Embodiment 3) FIG. 8 is an explanatory view showing a method of manufacturing a bolt according to Embodiment 3 of the present invention.
Note that the bolts to be manufactured are the same as those in the first embodiment, and thus description thereof will be omitted. In FIG. 8, reference numeral 2 denotes a columnar material, which is the same as that of the first embodiment, and therefore, is denoted by the same reference numerals and description thereof is omitted. Reference numeral 31 denotes a coarse round die having a coarse screw portion 31a formed on a cylindrical surface; 32, a fine round die having a fine screw portion 32a formed on a cylindrical surface; 33, a coarse round die 31 and a fine round A columnar material support disposed between the dies 32;
The columnar material 2 is supported.
【００２６】ボルト１を製造するには、円柱状材料２を
円柱状材料支持部３３に配置し、並目丸ダイス３１と細
目丸ダイス３２とに円柱状材料２を挟圧させ、並目丸ダ
イス３１及び細目丸ダイス３２を回転駆動させる。これ
により、円柱状材料２は並目丸ダイス３１及び細目平ダ
イス３２に挟圧され並目螺子部４及び細目螺子部５を転
造されながら転動する（転造工程）。転造された円柱状
材料２は塑性変形し、外周面に並目螺子部４及び細目螺
子部５が形成されボルト１が製造される。To manufacture the bolt 1, the columnar material 2 is placed on the columnar material support 33, and the columnar material 2 is pressed between the coarse round dies 31 and the fine round dies 32, and the coarse round dies 31 are pressed. The die 31 and the fine round die 32 are driven to rotate. Thereby, the columnar material 2 is pressed by the coarse round die 31 and the fine flat die 32 and rolls while rolling the coarse screw portion 4 and the fine screw portion 5 (rolling step). The rolled cylindrical material 2 is plastically deformed, and the coarse screw portion 4 and the fine screw portion 5 are formed on the outer peripheral surface, and the bolt 1 is manufactured.
【００２７】以上のように本実施の形態３におけるボル
トの製造方法は構成されているので、実施の形態１で得
られる作用に加え、以下のような作用を有する。 （１）並目丸ダイス３１の並目螺子部３１ａと細目丸ダ
イス３２の細目螺子部３２ａとが、同時に円柱状部材２
に転写される。よって、一工程（転造工程）のみで並目
螺子部４及び細目螺子部５が形成されるので、低原価で
量産可能であり、作業性に優れる 尚、本実施の形態においては、並目螺子部３１ａと細目
螺子部３２ａが各々別のダイスに形成されているものを
用いたが、並目螺子部と細目螺子部が一体に形成された
ダイスを用いても同様に実施可能である。As described above, the method of manufacturing a bolt according to the third embodiment is configured, and thus has the following operation in addition to the operation obtained in the first embodiment. (1) The coarse screw portion 31a of the coarse round die 31 and the fine screw portion 32a of the fine round die 32 are simultaneously formed in the columnar member 2.
Is transferred to Therefore, since the coarse screw portion 4 and the fine screw portion 5 are formed only in one process (rolling process), mass production can be performed at low cost and workability is excellent. Although the screw portion 31a and the fine screw portion 32a are formed in different dies, respectively, the present invention can be similarly implemented by using a die in which the coarse screw portion and the fine screw portion are integrally formed.
【００２８】[0028]
【発明の効果】以上のように本発明におけるボルトの製
造方法によれば、以下のような有利な効果を得ることが
できる。請求項１に記載の発明によれば、 （１）並目螺子部のピッチＰは、細目螺子部のピッチｐ
の偶数倍なので、並目螺子部の螺子山における細目螺子
部の谷部がボルトの軸に対して平行に存在するので、見
栄えが良く、ボルト完成後に目視による検査が容易であ
り不良品を発見しやすいボルトを製造できる。 （２）二工程（並目螺子部形成工程及び細目螺子部形成
工程）のみで並目螺子部及び細目螺子部が形成されるの
で、低原価で量産可能であり、作業性に優れる。As described above, according to the bolt manufacturing method of the present invention, the following advantageous effects can be obtained. According to the first aspect of the present invention, (1) the pitch P of the coarse thread portion is equal to the pitch p of the fine thread portion.
Since the valley of the fine thread in the thread of the coarse thread is parallel to the axis of the bolt, the appearance is good, the visual inspection is easy after the bolt is completed, and defective products are found. Bolts that can be easily manufactured can be manufactured. (2) Since the coarse screw portion and the fine screw portion are formed in only two steps (the coarse screw portion forming process and the fine screw portion forming process), mass production can be performed at low cost and workability is excellent.
【００２９】請求項２に記載の発明によれば、 （１）並目螺子部のピッチＰは、細目螺子部のピッチｐ
の偶数倍なので、並目螺子部の螺子山における細目螺子
部の谷部がボルトの軸に対して平行に存在するので、見
栄えが良く、ボルト完成後に目視による検査が容易であ
り不良品を発見しやすいボルトを製造できる。 （２）一工程（転造工程）のみで並目螺子部及び細目螺
子部が形成されるので、低原価で量産可能であり、作業
性に優れる。According to the second aspect of the present invention, (1) the pitch P of the coarse screw portion is equal to the pitch p of the fine screw portion.
Since the valley of the fine thread in the thread of the coarse thread is parallel to the axis of the bolt, the appearance is good, the visual inspection is easy after the bolt is completed, and defective products are found. Bolts that can be easily manufactured can be manufactured. (2) Since the coarse thread portion and the fine thread portion are formed only by one process (rolling process), mass production can be performed at low cost and workability is excellent.
【００３０】請求項３に記載の発明によれば、請求項１
又は２の効果に加え、 （１）並目螺子部に並目ナットを螺合させた後、細目螺
子部に細目ナットを螺合させた場合、細目螺子部のリー
ド角が並目螺子部のリード角より小さいので、同一回転
角度に対する細目ナットの移動距離は並目ナットのそれ
より小さくなる。よって、並目ナットが弛み方向に回転
し、被締結体から離れようとしても、細目ナットは並目
ナットより速く移動することができないので、並目ナッ
トは細目ナットに常に弛み方向への回転を抑制された状
態となり、弛みにくいボルトを製造することができるボ
ルトを製造することができる。According to the invention described in claim 3, according to claim 1
In addition to the effects of (2), (1) When a coarse nut is screwed into a coarse screw portion and then a fine nut is screwed into the fine screw portion, the lead angle of the fine screw portion is reduced. Since it is smaller than the lead angle, the moving distance of the fine nut for the same rotation angle is smaller than that of the coarse nut. Therefore, even if the coarse nut rotates in the loosening direction and tries to move away from the object to be fastened, the fine nut cannot move faster than the coarse nut, so the coarse nut always rotates the fine nut in the loosening direction. It is possible to manufacture a bolt that can be manufactured in a state where the bolt is suppressed and hardly loosened.
【００３１】請求項４に記載の発明によれば、請求項１
乃至３の内何れか一項の効果に加え、 （１）細目螺子部の谷底部（切除される部分）が浅いの
で、並目螺子部の山部に細目螺子部の谷底部が重なって
も並目螺子部の形状があまりかわらず、並目螺子部に螺
合するナットの締結力が弱まるのを防ぐことができるボ
ルトの製造することができる。According to the fourth aspect of the present invention, the first aspect is provided.
In addition to the effects described in any one of (3) to (3), (1) Since the valley bottom (removed portion) of the fine screw portion is shallow, even if the valley bottom of the fine screw portion overlaps the crest of the coarse screw portion, It is possible to manufacture a bolt capable of preventing the shape of the coarse screw portion from being too small and preventing the fastening force of the nut screwed into the coarse screw portion from weakening.
【００３２】請求項５に記載の発明によれば、請求項１
乃至４の内何れか一項の効果に加え、According to the invention of claim 5, according to claim 1,
In addition to the effects of any one of the above items 4 to 4,
【００３３】（１）細目螺子部に螺合するナットの弛み
方向（回転方向）は、並目螺子部に螺合するナットの弛
み方向（回転方向）と異なるので、弛みにくく締結力が
強く安全性に優れるボルトを製造することができる。(1) The loosening direction (rotation direction) of the nut screwed into the fine screw portion is different from the loosening direction (rotation direction) of the nut screwed into the coarse screw portion. A bolt having excellent properties can be manufactured.
【図１】本発明の実施の形態１におけるボルトの製造方
法により製造されるボルトの使用状態を示す説明図FIG. 1 is an explanatory view showing a use state of a bolt manufactured by a method for manufacturing a bolt according to a first embodiment of the present invention.
【図２】（ａ）図１におけるＡ部の拡大図 （ｂ）図１におけるＢ部の拡大図2A is an enlarged view of a portion A in FIG. 1; and FIG. 2B is an enlarged view of a portion B in FIG.
【図３】並目螺子部の頂部と細目螺子部の谷底部との位
置関係を示す説明図FIG. 3 is an explanatory diagram showing a positional relationship between a top portion of a coarse thread portion and a bottom portion of a fine thread portion.
【図４】（ａ）並目螺子部が切削により形成されていく
状態を示した説明図 （ｂ）細目螺子部が切削により形成されていく状態を示
した説明図FIG. 4 (a) is an explanatory diagram showing a state in which coarse thread portions are formed by cutting; and (b) is an explanatory diagram showing a state in which fine thread portions are formed by cutting.
【図５】本発明の実施の形態２におけるボルトの製造方
法を示す説明図FIG. 5 is an explanatory view showing a method for manufacturing a bolt according to Embodiment 2 of the present invention.
【図６】（ａ）並目平ダイスの並目螺子部側から視た平
面図 （ｂ）図６（ａ）のＣ−Ｃ線における矢視要部断面図6A is a plan view of the coarse flat die as viewed from the coarse screw portion side. FIG. 6B is a cross-sectional view of a main part taken along line CC in FIG. 6A.
【図７】（ａ）細目平ダイスの細目螺子部側から視た平
面図 （ｂ）図７（ａ）のＤ−Ｄ線における矢視要部断面図7A is a plan view of the fine flat die viewed from the fine screw portion side. FIG. 7B is a cross-sectional view of a main part taken along line DD in FIG. 7A.
【図８】本発明の実施の形態３におけるボルトの製造方
法を示す説明図FIG. 8 is an explanatory view showing a method of manufacturing a bolt according to Embodiment 3 of the present invention.
１ ボルト ２ 円柱状材料 ３ ボルト頭部 ４ 並目螺子部 ４ａ 頂部 ４ｂ 谷底部 ４ｃ フランク ５ 細目螺子部 ５ａ 谷底部 ６ 第１の被締結体 ７ 第２の被締結体 ８ 座金 ９ 並目ナット １０ 細目ナット １１ 削除部 １２ 並目螺子部切削用バイト １３ 細目螺子部切削用バイト ２１ 並目平ダイス ２１ａ 並目螺子部 ２２ 細目平ダイス ２２ａ 細目螺子部 ３１ 並目丸ダイス ３１ａ 並目螺子部 ３２ 細目丸ダイス ３２ａ 細目螺子部 ３３ 円柱状材料支持部 Ｐ，ｐ ピッチ Reference Signs List 1 bolt 2 cylindrical material 3 bolt head 4 coarse screw portion 4a top 4b valley bottom 4c flank 5 fine screw portion 5a valley bottom 6 first fastened object 7 second fastened object 8 washer 9 coarse nut 10 Fine nut 11 Removed part 12 Coarse thread cutting bit 13 Fine thread cutting bit 21 Coarse flat die 21a Coarse thread part 22 Fine coarse die 22a Fine screw part 31 Coarse round die 31a Coarse screw part 32 Fine Round die 32a Fine thread part 33 Cylindrical material support part P, p pitch
Claims (5)
から所定部まで切削又は転造によりピッチＰの並目螺子
部を形成する並目螺子部形成工程と、 少なくとも前記円柱状材料の先端部から前記並目螺子部
の所定部まで、ピッチｐ（ｐ＝Ｐ／２ｎ，ｎ＝自然数）
の細目螺子部を切削又は転造により形成する細目螺子部
形成工程と、を備えたことを特徴とするボルトの製造方
法。1. A step of forming a coarse thread portion having a pitch P by cutting or rolling from a tip portion of a cylindrical material which is a base material of a bolt to a predetermined portion, and at least a step of forming the coarse thread portion. Pitch p (p = P / 2n, n = natural number) from the tip to the predetermined portion of the coarse thread portion
A fine screw portion forming step of forming the fine screw portion by cutting or rolling.
から所定部まで形成されるピッチＰの並目螺子部と少な
くとも前記円柱状材料の先端部から前記並目螺子部の所
定部まで形成されるピッチｐ（ｐ＝Ｐ／２ｎ，ｎ＝自然
数）の細目螺子部とを転造により同時に形成する転造工
程を備えたことを特徴とするボルトの製造方法。2. A coarse thread portion having a pitch P formed from a front end portion of a columnar material as a base material of a bolt to a predetermined portion, and at least from a front end portion of the columnar material to a predetermined portion of the coarse thread portion. A method for manufacturing a bolt, comprising a rolling step of simultaneously forming a fine thread portion having a pitch p (p = P / 2n, n = natural number) by rolling.
並目螺子部の螺子山の条数以下であることを特徴とする
請求項１又は２に記載のボルトの製造方法。3. The method according to claim 1, wherein the number of threads of the fine screw portion is equal to or less than the number of threads of the coarse screw portion.
で谷底に接する仮想的な円筒の直径）が、前記細目螺子
部の谷の径より小さいことを特徴とする請求項１乃至３
の内何れか一項に記載のボルトの製造方法。4. The method according to claim 1, wherein a diameter of a valley of the coarse screw portion (diameter of a virtual cylinder coaxial with the bolt and in contact with a valley bottom) is smaller than a diameter of the valley of the fine screw portion. 3
The method for manufacturing a bolt according to any one of claims.
子山の巻き方向が、異なることを特徴とする請求項１乃
至４の内何れか一項に記載のボルトの製造方法。5. The method for manufacturing a bolt according to claim 1, wherein the thread directions of the coarse thread portion and the fine thread portion are different from each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000065600A JP2001252737A (en) | 2000-03-09 | 2000-03-09 | Manufacturing method of bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000065600A JP2001252737A (en) | 2000-03-09 | 2000-03-09 | Manufacturing method of bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001252737A true JP2001252737A (en) | 2001-09-18 |
Family
ID=18585095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000065600A Withdrawn JP2001252737A (en) | 2000-03-09 | 2000-03-09 | Manufacturing method of bolt |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001252737A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003260532A (en) * | 2002-03-08 | 2003-09-16 | Japan Power Fastening Co Ltd | Apparatus and method for manufacturing bolt |
| JP2007229760A (en) * | 2006-02-28 | 2007-09-13 | Saga Univ | Method for manufacturing double-threaded screw bolt |
| JP2007237223A (en) * | 2006-03-08 | 2007-09-20 | Shinichi Nishida | Method of manufacturing thread rolling die |
| KR101442158B1 (en) | 2012-12-24 | 2014-11-03 | 전북대학교산학협력단 | thread rolling use medical screw manufacturing method |
| KR20190038045A (en) * | 2017-09-29 | 2019-04-08 | 한국서부발전 주식회사 | Method for manufacturing bolt |
-
2000
- 2000-03-09 JP JP2000065600A patent/JP2001252737A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003260532A (en) * | 2002-03-08 | 2003-09-16 | Japan Power Fastening Co Ltd | Apparatus and method for manufacturing bolt |
| JP2007229760A (en) * | 2006-02-28 | 2007-09-13 | Saga Univ | Method for manufacturing double-threaded screw bolt |
| JP2007237223A (en) * | 2006-03-08 | 2007-09-20 | Shinichi Nishida | Method of manufacturing thread rolling die |
| KR101442158B1 (en) | 2012-12-24 | 2014-11-03 | 전북대학교산학협력단 | thread rolling use medical screw manufacturing method |
| KR20190038045A (en) * | 2017-09-29 | 2019-04-08 | 한국서부발전 주식회사 | Method for manufacturing bolt |
| KR102009082B1 (en) * | 2017-09-29 | 2019-08-08 | 한국서부발전 주식회사 | Method for manufacturing bolt |
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| A300 | Withdrawal of application because of no request for examination |
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