JP2807864B2 - Method of manufacturing bolt having flat portion in screw portion and bolt - Google Patents
Method of manufacturing bolt having flat portion in screw portion and boltInfo
- Publication number
- JP2807864B2 JP2807864B2 JP6301354A JP30135494A JP2807864B2 JP 2807864 B2 JP2807864 B2 JP 2807864B2 JP 6301354 A JP6301354 A JP 6301354A JP 30135494 A JP30135494 A JP 30135494A JP 2807864 B2 JP2807864 B2 JP 2807864B2
- Authority
- JP
- Japan
- Prior art keywords
- bolt
- thread
- flat
- screw
- intermittently
- 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 - Fee Related
Links
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- Forging (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ねじ部に平面部を有す
るボルトの製造方法及びボルトに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a bolt having a flat portion in a screw portion and a bolt.
【０００２】[0002]
【従来の技術】従来から、図７に示すような、ねじ部ａ
の両側部に平行する平面部ｂを形成したボルトが存在す
る。こうしたボルトは二部材間にねじ込み、平面部を利
用してスパナなどで回転を与えることによって、二部材
を並行移動させて微調整を行う用途に用いられている。
また、ピッチや方向の異なるねじの間に平面部を形成し
たボルトにおいては、二部材間の間隔を接近させたり離
したりする位置決め調整ボルト等として利用されてい
る。ところが、従来はこうしたボルトを次のような工程
で製造している。 第１工程：丸棒の転造によりねじ部ａを形成する。 第２工程：フライスにより両平面部ｂをカットする。 第３工程：フライスにより発生したバリの除去のため再
度転造する。2. Description of the Related Art Conventionally, as shown in FIG.
There is a bolt that forms a plane portion b parallel to both sides of the bolt. Such bolts are used in applications in which two members are moved in parallel to make fine adjustments by screwing between the two members and applying rotation with a wrench or the like using a flat portion.
In addition, a bolt having a flat portion formed between screws having different pitches and directions is used as a positioning adjustment bolt or the like for moving a space between two members closer or farther apart. However, conventionally, such bolts are manufactured by the following steps. First step: The thread portion a is formed by rolling a round bar. Second step: Both plane portions b are cut by milling. Third step: Rolling again to remove burrs generated by milling.
【０００３】[0003]
【本発明が解決しようとする課題】従来の加工法は、上
記したように、先ずボルトを製造し、これをフライス加
工することによりねじの山を潰してしまう。そのため、
潰したバリを除去するために、再度ダイスによるねじさ
らいを行うという無駄な工程を経て製造するものであっ
た。In the conventional processing method, as described above, first, a bolt is manufactured, and the thread is crushed by milling the bolt. for that reason,
In order to remove the crushed burrs, it is manufactured through a useless process of re-threading with a die.
【０００４】[0004]
【本発明の目的】本発明は上記のような問題点を解決す
るためになされたもので、従来よりも少ない工程で迅速
に加工することができる、ねじ部に平面部を有するボル
トの製造方法及びボルトを提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and a method of manufacturing a bolt having a flat portion in a screw portion, which can be processed quickly with fewer steps than before. And bolts.
【０００５】本発明は、上記課題を解決するため、ねじ
部の軸方向に断続的に平面部を有するボルトの製造方法
において、丸棒鋼の周面にねじ部を転造した後、谷径部
を完全に残してねじ山のみをプレス切断し、断続的に複
数の平面部を形成することを特徴とした、ねじ部に平面
部を有するボルトの製造方法及びボルトを提供する。ま
た、ねじ部の軸方向に断続的に形成された複数の平面部
と、これらの平面部間を連結する線状部とよりなるボル
トの製造方法をにおいて、丸棒鋼の周面にねじ部を転造
した後、谷径部を部分的に残すように谷径部より僅かに
深くねじ山をプレス切断し、断続的に複数の平面部を形
成すると共に、これらの平面部間を連結する線状部を形
成することを特徴とした、ねじ部に平面部を有するボル
トの製造方法及びボルトを提供する。In order to solve the above-mentioned problems, the present invention provides a method for manufacturing a bolt having a flat portion intermittently in the axial direction of a screw portion. And a method of manufacturing a bolt having a flat portion in a screw portion, wherein a plurality of flat portions are formed intermittently by press-cutting only the screw thread while completely leaving the screw portion. Further, in a method for manufacturing a bolt comprising a plurality of flat portions formed intermittently in the axial direction of a screw portion and a linear portion connecting these flat portions, a method for manufacturing a screw portion on a peripheral surface of a round bar steel is provided. After rolling, the thread is press-cut slightly deeper than the valley portion so as to partially leave the valley portion, and a plurality of flat portions are formed intermittently and a line connecting these flat portions is formed. Provided are a method for manufacturing a bolt having a flat portion in a screw portion, and a bolt, wherein the bolt has a flat portion.
【０００６】以下、本発明の一実施例について説明す
る。Hereinafter, an embodiment of the present invention will be described.
＜イ＞第１工程 丸鋼棒を転造によってボルトに加工する。即ち、図３に
おいて丸鋼棒１を複数の転造用ダイス２で加圧しつつ回
転を与える。その結果、図４に示すようなボルト３を加
工することができる。<B> First step A round steel bar is formed into a bolt by rolling. That is, in FIG. 3, the round steel bar 1 is rotated while being pressed by a plurality of rolling dies 2. As a result, the bolt 3 as shown in FIG. 4 can be processed.
【０００７】＜ロ＞第２工程 転造の終わったボルト３を、図５に示すように、下刃４
とおさえ台５との間に位置させる。おさえ台５にはボル
ト３と同一のピッチのねじ山が加工してあるので、下刃
４とおさえ台５とでボルト３を確実に固定することがで
きる。<B> Second Step As shown in FIG. 5, the lower blade 4
And the presser stand 5. Since the screw thread having the same pitch as that of the bolt 3 is machined on the holding table 5, the bolt 3 can be securely fixed by the lower blade 4 and the holding table 5.
【０００８】固定した後、下刃４を上昇させ、おさえ台
５との間でねじ山３１を剪断する。このとき、剪断する
ボルト３の部位は、ねじ山３１の山径部３１ａと谷径部
３１ｂとの間とする。すなわち、谷径部３１ｂより深く
下刃４を食い込ませずに剪断を行う。After the fixing, the lower blade 4 is raised, and the thread 31 is sheared between the lower blade 4 and the presser table 5. At this time, the portion of the bolt 3 to be sheared is between the thread diameter portion 31a and the root diameter portion 31b of the screw thread 31. That is, shearing is performed without penetrating the lower blade 4 deeper than the valley diameter portion 31b.
【０００９】その結果、図１、２に示すように、軸方向
に断続的に複数の平面部３２が形成されることになる。
なお、下刃４をボルト３の中心軸と平行に形成せず、斜
面状、曲面状に形成しておけば、ボルト３には点接触で
食い込み、容易に切断することができる。As a result, as shown in FIGS. 1 and 2, a plurality of plane portions 32 are formed intermittently in the axial direction.
If the lower blade 4 is not formed parallel to the center axis of the bolt 3 but is formed in a slope or a curved surface, the lower blade 4 can bite into the bolt 3 at point contact and be easily cut.
【００１０】[0010]
【作用】本発明は次のような作用を有する。 ＜イ＞本発明は、従来の工法のようにフライス加工を行
わず、プレス加工によってボルトの両側面を切断する。
この工程では、食い込みの始めには荷重が分散されず、
ねじの山頂のみ、すなわち「点」に大きい力が集中する
のでボルトを圧縮することがない。そのため、ねじ山が
潰れてバリが発生することがない。The present invention has the following functions. <A> In the present invention, both sides of the bolt are cut by press working without performing milling as in the conventional method.
In this process, the load is not distributed at the beginning of the bite,
Since a large force is concentrated only on the top of the screw, that is, at the "point", the bolt is not compressed. For this reason, the burrs do not occur due to the collapse of the thread.
【００１１】＜ロ＞従来は、平面部の切断の際に、ねじ
山の谷径部よりもかなり深く切断し、平面部の外形を長
方形に近い状態に形成していた。そのため、ボルトの鋼
材と下刃との接触面積が大きく、大きい摩擦抵抗が発生
して、下刃の貫入側のボルト鋼材にムシレが発生した。<B> Conventionally, when cutting a flat portion, the cut portion is cut considerably deeper than the root portion of the thread, and the outer shape of the flat portion is formed in a state close to a rectangle. For this reason, the contact area between the steel material of the bolt and the lower blade was large, and a large frictional resistance was generated, and the bolt steel material on the penetrating side of the lower blade was warped.
【００１２】それに対して本発明は、剪断するボルト３
の部位は、ねじ山３１の山径部３１ａと谷径部３１ｂと
の間とし、谷径部３１ｂより深く下刃４を食い込ませず
に剪断を行う。従って、ボルトの鋼材と下刃との接触面
積が最小限で済み、摩擦抵抗が減少するため、上記のよ
うなムシレの発生を防止できる。On the other hand, the present invention provides a bolt 3 for shearing.
Is set between the thread diameter portion 31a and the root diameter portion 31b of the screw thread 31, and shearing is performed without penetrating the lower blade 4 deeper than the root diameter portion 31b. Therefore, the contact area between the steel material of the bolt and the lower blade can be minimized, and the frictional resistance is reduced, so that the occurrence of the above-mentioned stuffiness can be prevented.
【００１３】[0013]
【その他の実施例】図６に示すように、ねじ部の軸方向
に断続的に形成された複数の平面部３２と、これらの平
面部３２間を連結する線状部３３とよりなるボルトであ
っても、上記実施例と同様の作用効果を得ることができ
る。Other Embodiments As shown in FIG. 6, a bolt comprising a plurality of flat portions 32 formed intermittently in the axial direction of a screw portion and a linear portion 33 connecting these flat portions 32 is provided. Even so, the same operation and effect as the above embodiment can be obtained.
【００１４】この場合の製造方法は、丸棒鋼の周面にね
じ部を転造した後、谷径部３１ｂより僅かに深くねじ山
３１をプレス切断し、平面部３２間を線状部３３により
連結するものである。The manufacturing method in this case is to form a thread on the peripheral surface of the round bar steel, then press-cut the thread 31 slightly deeper than the root diameter portion 31b, and use a linear portion 33 to connect between the flat portions 32. It is something that connects.
【００１５】本実施例の場合も、剪断するボルト３の部
位は谷径部３１ｂより僅かに深いだけであるため、ボル
トの鋼材と下刃との摩擦抵抗が少なくて済み、ボルト鋼
材のムシレの発生を防止することができる。Also in the case of this embodiment, since the portion of the bolt 3 to be sheared is only slightly deeper than the valley portion 31b, the frictional resistance between the steel material of the bolt and the lower blade can be reduced, and the bolt steel material can be removed smoothly. Generation can be prevented.
【００１６】[0016]
【本発明の効果】本発明は以上のようになるため、次の
ような効果を得ることができる。 ＜イ＞プレス加工によってボルトの両側面を切断するた
め、ねじ山が潰れてバリが発生することがない。従っ
て、煩雑なバリの除去工程が不要となり、従来より少な
い工程で迅速かつ低コストで加工を行うことができる。According to the present invention as described above, the following effects can be obtained. <B> Since both side surfaces of the bolt are cut by press working, the thread is not crushed and burrs are not generated. Therefore, a complicated burr removing step is not required, and the processing can be performed quickly and at low cost with fewer steps than in the related art.
【００１７】＜ロ＞ボルトの鋼材と下刃との接触面積が
最小限で済み、摩擦抵抗が減少するため、ボルト鋼材の
ムシレの発生を防止できる。従って、商品価値の高いボ
ルトを得ることができる。<B> Since the contact area between the steel material of the bolt and the lower blade is minimized and the frictional resistance is reduced, it is possible to prevent the bolt steel material from being curled. Therefore, a bolt with high commercial value can be obtained.
【図１】 本発明のボルトの一実施例の側面図FIG. 1 is a side view of an embodiment of a bolt according to the present invention.
【図２】 本発明のボルトの一実施例の断面図FIG. 2 is a sectional view of an embodiment of the bolt of the present invention.
【図３】 ねじ転造工程の説明図FIG. 3 is an explanatory view of a thread rolling process.
【図４】 ねじ転造工程の説明図FIG. 4 is an explanatory view of a thread rolling process.
【図５】 平面部剪断工程の説明図FIG. 5 is an explanatory view of a plane portion shearing step.
【図６】 その他の実施例の説明図FIG. 6 is an explanatory view of another embodiment.
【図７】 従来技術の説明図FIG. 7 is an explanatory diagram of a conventional technique.
Claims (4)
るボルトの製造方法において、 丸棒鋼の周面にねじ部を転造した後、 谷径部を完全に残してねじ山のみをプレス切断し、断続
的に複数の平面部を形成することを特徴とした、 ねじ部に平面部を有するボルトの製造方法。1. A method for producing a bolt having intermittently flat portion in the axial direction of the threaded portion, after rolling a screw portion on the peripheral surface of the round bar steel, the only thread completely leaving valleys diameter A method for producing a bolt having a flat portion in a screw portion, comprising press cutting and intermittently forming a plurality of flat portions.
ス切断し、ねじ部の軸方向に断続的に形成した複数の平
面部を有することを特徴とした、 ボルト。2. The method according to claim 2, wherein only the thread is prepressed while leaving the root diameter completely.
And a plurality of flats formed intermittently in the axial direction of the thread.
A bolt having a surface portion .
数の平面部と、これらの平面部間を連結する線状部とよ
りなるボルトの製造方法において、 丸棒鋼の周面にねじ部を転造した後、谷径部を部分的に残すように 谷径部より僅かに深くねじ
山をプレス切断し、断続的に複数の平面部を形成すると
共に、これらの平面部間を連結する線状部を形成するこ
とを特徴とした、 ねじ部に平面部を有するボルトの製造方法。3. A method of manufacturing a bolt comprising a plurality of flat portions formed intermittently in an axial direction of a screw portion and a linear portion connecting the flat portions, wherein a screw is formed on a peripheral surface of the round bar. After rolling the part, press cut the thread slightly deeper than the root diameter part so as to partially leave the root diameter part, and intermittently form a plurality of flat parts and connect these flat parts A method of manufacturing a bolt having a flat portion in a screw portion, the method comprising forming a linear portion to be formed.
僅かに深くねじ山をプレス切断し、ねじ部の軸方向に断
続的に形成した複数の平面部と、これらの平面部間を連
結する線状部とを有することを特徴とした、 ボルト。4. The valley portion is formed so as to partially leave the valley portion.
Press cut the thread slightly deeper and cut in the axial direction of the thread.
A plurality of successively formed flat portions and the connection between these flat portions are connected.
A bolt having a linear portion to be connected .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6301354A JP2807864B2 (en) | 1994-11-10 | 1994-11-10 | Method of manufacturing bolt having flat portion in screw portion and bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6301354A JP2807864B2 (en) | 1994-11-10 | 1994-11-10 | Method of manufacturing bolt having flat portion in screw portion and bolt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08132166A JPH08132166A (en) | 1996-05-28 |
| JP2807864B2 true JP2807864B2 (en) | 1998-10-08 |
Family
ID=17895860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6301354A Expired - Fee Related JP2807864B2 (en) | 1994-11-10 | 1994-11-10 | Method of manufacturing bolt having flat portion in screw portion and bolt |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2807864B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002010597A1 (en) * | 2000-07-28 | 2002-02-07 | Ozawa, Junzo | Fastening implement |
| AUPS266202A0 (en) * | 2002-05-30 | 2002-06-20 | Industrial Rollformers Pty Limited | Threaded bar |
| JP4688057B2 (en) * | 2003-09-24 | 2011-05-25 | 日本精工株式会社 | Ball screw mechanism |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS48102756A (en) * | 1972-04-10 | 1973-12-24 | ||
| JPH0389011A (en) * | 1989-08-31 | 1991-04-15 | Owari Seiki Kk | Screw and its manufacture |
-
1994
- 1994-11-10 JP JP6301354A patent/JP2807864B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08132166A (en) | 1996-05-28 |
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