JPS6343605B2 - - Google Patents
Info
- Publication number
- JPS6343605B2 JPS6343605B2 JP55046255A JP4625580A JPS6343605B2 JP S6343605 B2 JPS6343605 B2 JP S6343605B2 JP 55046255 A JP55046255 A JP 55046255A JP 4625580 A JP4625580 A JP 4625580A JP S6343605 B2 JPS6343605 B2 JP S6343605B2
- Authority
- JP
- Japan
- Prior art keywords
- thread
- incomplete
- forming
- die
- effective diameter
- 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
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- Forging (AREA)
Description
【発明の詳細な説明】
本発明は、緩み止めねじおよびその製造方法に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a locking screw and a method for manufacturing the same.
緩み止め構造を有する従来のボルトとしては、
特開昭52−149550号公報に、ねじ転造の際にボル
トのねじ部を部分的に押圧することにより、正常
ねじ部に比べてピツチは変らないが、ねじ山角度
とねじ谷角度の若干小さな截頭状の変形ねじ部を
設けたボルトが開示されている。しかしながら、
正常な雌ねじのねじ山とねじ谷の角度に対しボル
トの変形ねじ部のねじ山をねじ谷の角度が小さく
なつているので、ボルトの締付時に雌ねじのねじ
山のフランクが局部的に大きな圧力を受けて変形
するためねじ山を傷める欠点がある。 Conventional bolts with a locking structure include:
JP-A No. 52-149550 discloses that by partially pressing the threaded part of a bolt during thread rolling, the pitch does not change compared to a normal threaded part, but the thread angle and thread root angle slightly change. A bolt with a small truncated modified thread is disclosed. however,
The angle between the thread and root of the deformed thread of the bolt is smaller than the angle between the thread and root of the normal female thread, so when the bolt is tightened, the flank of the female thread is subject to localized large pressure. It has the disadvantage of damaging the threads as it deforms due to the impact.
本発明の目的は、上記の欠点を除去して、締付
時に雌ねじのねじ山を傷めず、繰返し使用可能な
緩め止めボルトおよびその製造方法を提供するこ
とである。 An object of the present invention is to provide a locking bolt that eliminates the above-mentioned drawbacks, does not damage the threads of the internal thread during tightening, and can be used repeatedly, and a method for manufacturing the same.
一般に、雄ねじと雌ねじの嵌め合いは、有効
径、すなわち完成されたねじの外径とその谷径の
ほぼ中間の位置にある有効径を基準として設定さ
れ、その有効径より大きい寸法を雌ねじ、および
小さい寸法を雄ねじとして形成している。本発明
は、このねじの基本を応用したものであり、ねじ
軸部に、雌ねじの有効径より若干大きい有効径を
有する不完全ねじ山の領域を複数個設けることを
特徴とする。 In general, the fit between a male thread and a female thread is set based on the effective diameter, which is approximately halfway between the outer diameter of the completed thread and its root diameter, and the female thread is The small dimensions are formed as external threads. The present invention is an application of the basics of this screw, and is characterized in that the screw shaft portion is provided with a plurality of regions of incomplete threads having an effective diameter slightly larger than the effective diameter of the female thread.
一般に、ねじ山の成形方法は、ダイスを用いた
転造によるものが主流となつており、その転造素
材径としては、所定のねじのほぼ有効径を用いて
いる。ねじの転造は塑性加工によつて行われ、そ
のときの転造素材の材料の流れは、所定のねじ山
の高さの1/2が素材に食い込み、他の1/2が素材の
外径より上方に盛り上がり、上下対称の材料移動
によつてねじ山が完成される。実際には、左右一
対のダイスの間を素材が押圧された状態で転がり
ながらダイスのねじ山に素材が充満することによ
り正しいねじ山の成形と精度が得られる。本発明
で言う「不完全ねじ山」とは、雄ねじの有効径を
雌ねじの有効径の上限の許容寸法に等しいか、ま
たはこれより若干大きくしたときに、素材に加わ
る押しつけ力が小さくなり、従つてねじ山の頂点
がダイスを充満せず、不完全な頂きとなることを
言う。不完全ねじ山を成形するには、ダイスの、
不完全ねじ山を成形するための部分のねじ山が正
常のねじ山と同一のねじ山であり、かつ正常なね
じ山を成形するための他の部分のねじ山より所定
の寸法だけ、すなわち雌ねじの有効径より外方へ
若干転移された雄ねじの有効径の転移量だけ低く
配置すればよい。 Generally, the mainstream method for forming threads is rolling using a die, and the diameter of the rolling material is approximately the effective diameter of a predetermined thread. Thread rolling is performed by plastic working, and at that time, the flow of the material for rolling material is such that 1/2 of the specified thread height bites into the material, and the other 1/2 goes outside of the material. The thread bulges upward from the diameter, and the thread is completed by vertically symmetrical material movement. In reality, the material fills the threads of the dies as it rolls under pressure between the pair of left and right dies, resulting in correct thread formation and accuracy. In the present invention, "incomplete thread" means that when the effective diameter of the male thread is made equal to or slightly larger than the upper limit of the effective diameter of the female thread, the pressing force applied to the material becomes small and This means that the top of the thread does not fill the die, resulting in an incomplete top. To form an incomplete thread, use the die,
The thread of the part for forming the incomplete thread is the same thread as the normal thread, and the thread of the other part for forming the normal thread is a predetermined dimension, that is, the female thread. The effective diameter of the external thread may be slightly shifted outward from the effective diameter of the external thread.
以下、本発明を実施例について附図により説明
する。 Hereinafter, the present invention will be explained with reference to embodiments with reference to the accompanying drawings.
第１図に示した本発明による緩み止めボルトに
おいて、１はボルト頭部、２はねじ軸部を示す。 In the locking bolt according to the present invention shown in FIG. 1, 1 indicates the bolt head and 2 indicates the screw shaft.
本発明により、ねじ軸部２に、雌ねじまたは雄
ねじの有効径d2より大きい有効径d′2を有する複
数の不完全ねじ山の領域３を円周方向に間隔を置
いて設けてある。円周方向に不完全ねじ山領域３
を複数個設けることにより、ねじ軸に均等な力を
作用させることができる。また、第２図におい
て、不完全ねじ山４の有効径d′2は、これと係合
する雌ねじの有効径の上限の許容寸法に等しい
か、またはこれより大きくなるように設計するの
が望ましい。 According to the invention, the threaded shank 2 is provided with a plurality of incomplete thread regions 3 spaced circumferentially, each having an effective diameter d ' 2 larger than the effective diameter d 2 of the female or male thread. Incomplete thread area 3 in circumferential direction
By providing a plurality of screws, uniform force can be applied to the screw shaft. In addition, in Fig. 2, it is desirable that the effective diameter d' 2 of the incomplete thread 4 is designed to be equal to or larger than the upper limit of the allowable effective diameter of the female thread that engages with it. .
本発明の弛み止めねじは、第２図から良く分る
ように、ねじ軸部の雄ねじの有効径d2において、
不完全ねじ山４の厚さが、正常のねじ山５の厚さ
より大きくなつており、しかも不完全ねじ山４の
角度、ピツチおよびリード角が正常のねじ山５と
等しくなつている。なお、第２図において、d3は
おねじの谷径、d′3は不完全ねじ山の谷径、Ｈは
おねじのねじ山の高さ、Ｐはねじ山のピツチを示
す。 As can be clearly seen from FIG. 2, the locking screw of the present invention has, in the effective diameter d 2 of the male thread of the screw shaft,
The thickness of the incomplete thread 4 is greater than the thickness of the normal thread 5, and the angle, pitch and lead angle of the incomplete thread 4 are equal to those of the normal thread 5. In FIG. 2, d 3 is the root diameter of the male thread, d' 3 is the root diameter of the incomplete thread, H is the height of the male thread, and P is the pitch of the thread.
上記のように構成された不完全ねじ山を有する
弛み止めねじを製造するには、第３ａ図に示し
た、不完全ねじ山を成形する部分１０を有する上
方転造ダイス１２と、第３ｂ図に示した、不完全
ねじ山を成形する部分１４を有する下方転造平ダ
イス１６の間でねじ軸部を慣用の方法で転造すれ
ば良い。１２ａと１６ａは転造平ダイスの転造始
端部を示し、１２ｂと１６ｂはその転造終端部を
示す。 To manufacture a locking screw with an incomplete thread configured as described above, an upper rolling die 12 having a portion 10 for forming an incomplete thread as shown in FIG. 3a and an upper rolling die 12 as shown in FIG. 3b are used. The screw shaft portion may be rolled in a conventional manner between a lower flat rolling die 16 having a portion 14 for forming an incomplete thread, as shown in FIG. 12a and 16a indicate rolling starting ends of the flat rolling die, and 12b and 16b indicate rolling terminal ends thereof.
本発明の弛め止めねじの製造に用いる転造平ダ
イスを、第３ｂ図の線−に沿つて断面した拡
大断面を第４図に示す。この転造平ダイスは、不
完全ねじ山を成形する部分１４のねじ山を、正常
のねじ山を成形する他の部分２０のねじ山より所
定の寸法だけ、すなわち雌ねじの有効径より外方
へ若干転移された雄ねじの有効径の転移量だけ低
くなるように、好適には少なくとも0.2mmまたは
それ以上の段差をもつて低くなるように押圧成型
されている。この場合、両者のねじ山の角度、ピ
ツチおよびリード角は等しい。 FIG. 4 shows an enlarged cross-section of a rolled flat die used for manufacturing the locking screw of the present invention taken along the line - in FIG. 3b. This flat rolling die moves the thread of the part 14 that forms an incomplete thread by a predetermined dimension from the thread of the other part 20 that forms a normal thread, that is, outward from the effective diameter of the female thread. It is press-molded so that it is lowered by the amount of displacement of the effective diameter of the male thread, which is slightly displaced, preferably with a step of at least 0.2 mm or more. In this case, the angle, pitch, and lead angle of both threads are equal.
第４図のようにねじ山を一体に成型した転造ダ
イスでも良いが、不完全ねじ山を成型する部分と
して別個に製造したダイスチツプを転造平ダイス
の所定の凹所に嵌め込んで作つた転造平ダイスで
も良い。 A rolling die with integrally molded threads as shown in Fig. 4 may be used, but a die tip manufactured separately as a part for molding incomplete threads may be fitted into a predetermined recess of a flat rolling die. Rolled flat dies may also be used.
第５図には、本発明による弛み止めねじを前述
の転造ダイスを用いて転造しているときの材料の
流れを示す。転造ダイスの不完全ねじ山成形部分
が正常のねじ成型部分より若干ひつ込んでいる
上、雄ねじの有効径d2において不完全ねじ山４の
厚さが正常のねじ山より厚くなるので、転造ダイ
スと不完全ねじ山４との間に空間２２が形成され
る。 FIG. 5 shows the flow of material when the locking screw according to the present invention is being rolled using the above-mentioned rolling die. The incomplete thread forming part of the rolling die is slightly more constricted than the normal thread forming part, and the thickness of the incomplete thread 4 is thicker than the normal thread thread at the effective diameter d 2 of the male thread. A space 22 is formed between the forming die and the incomplete thread 4.
本発明による弛み止めねじでは、雄ねじの不完
全ねじ山の角度、ピツチおよびリード角が雌ねじ
と同じであり、雄ねじのねじ山の有効径のみを外
方へ若干転移させた有効径を有する不完全ねじ山
の領域をねじ軸に形成してあるので、ねじ締めつ
け時に発生する単位面積当たりの摩擦係数が小さ
く、しかも広い面積での接触が図れるので全体の
摩擦トルクが大きくなり、その抵抗によつてゆる
みにくい締結となる。また、雄ねじと雌ねじの各
フランク面での接触であるから、雌ねじのねじ山
の変形がほとんどなく、ねじ山同志のカジリ現象
が少ない。従つて、繰り返し使用してもねじ山の
損傷が少ない。さらに、本発明の緩み止めねじの
雄ねじと係合する相手雌ねじの精度の影響を全く
受けない。 In the locking screw according to the present invention, the angle, pitch, and lead angle of the incomplete thread of the male thread are the same as those of the female thread, and the effective diameter of the thread of the male thread is slightly shifted outward. Since the thread area is formed on the screw shaft, the coefficient of friction per unit area that occurs when tightening the screw is small, and since contact can be achieved over a wide area, the overall friction torque is large, and the resistance increases. It is a fastening that is difficult to loosen. Further, since the male thread and the female thread are in contact with each other on their respective flank surfaces, there is almost no deformation of the threads of the female thread, and there is little occurrence of galling between the threads. Therefore, there is little damage to the threads even after repeated use. Further, the locking screw of the present invention is completely unaffected by the accuracy of the male thread and the mating female thread that engages with each other.
また、不完全ねじ山の有効径を変更することに
より雌ねじと係合する際のねじ込みトルクや弛み
止めトルクを自由に設計することができる。 Further, by changing the effective diameter of the incomplete thread, the screwing torque and locking torque when engaging with the female thread can be freely designed.
さらに、本発明の弛み止めねじを製造するため
には、転造ダイスのねじ山を一部分変更するだけ
で良いので、転造ダイスの設計製作が容易である
上、その転造ダイスを従来の転造機で使用できる
利点がある。 Furthermore, in order to manufacture the locking screw of the present invention, it is only necessary to partially change the threads of the rolling die, so it is easy to design and manufacture the rolling die. It has the advantage of being usable in manufacturing machines.
第１図は本発明の弛み止めねじの側面図、第２
図は第１図の線−に沿つて切断した部分断面
図、第３ａおよび３ｂ図はそれぞれ本発明の弛み
止めねじを転造するための上方および下方転造ダ
イスの正面図、第４図は第３ｂ図の線−に沿
つて切断した下方転造ダイスの部分拡大断面図、
第５図は転造ダイスを用いて本発明の弛み止めね
じを製造しているときの材料の流れを示す部分拡
大断面図である。
２……ねじ軸部、３……不完全ねじ山の領域、
d2……おねじの有効径、d′2……不完全ねじ山の
有効径、４……不完全ねじ山、５……正常なねじ
山、１２，１６……転造ダイス、１０，１４……
不完全ねじ山を成形するための転造ダイスの部
分。
Fig. 1 is a side view of the locking screw of the present invention, Fig. 2 is a side view of the locking screw of the present invention;
3a and 3b are front views of upper and lower rolling dies for rolling the locking screw of the present invention, respectively. FIG. 4 is a partial sectional view taken along the line - of FIG. A partially enlarged cross-sectional view of the lower rolling die taken along the line - in FIG. 3b;
FIG. 5 is a partially enlarged sectional view showing the flow of material when manufacturing the locking screw of the present invention using a rolling die. 2...Screw shaft portion, 3...Incomplete thread area,
d 2 ... Effective diameter of male thread, d' 2 ... Effective diameter of incomplete thread, 4 ... Incomplete thread, 5 ... Normal thread, 12, 16 ... Rolling die, 10, 14...
Part of a rolling die for forming incomplete threads.
Claims (1)
完全ねじ山の領域がねじ軸部の複数の個所に設け
られ、前記不完全ねじ山とねじ谷の角度およびピ
ツチが雄ねじおよび雌ねじの正常なねじ山とねじ
谷の角度およびピツチに等しいことを特徴とする
緩み止めねじ。 ２ 前記不完全ねじ山の有効径が、これと係合す
る雌ねじの有効径の上限の許容寸法に等しいか、
またはこれより大きい、特許請求の範囲第１項記
載の緩み止めねじ。 ３ 雄ねじの有効径より大きい有効径を有する不
完全ねじ山の領域がねじ軸部の複数の個所に設け
られている緩み止めねじをダイスを用いて製造す
る方法において、ダイスの、不完全ねじ山を成形
するための部分のねじ山が、正常なねじ山を成形
するための他の部分のねじ山と、ねじ山角度、ね
じ谷角度およびピツチにおいて同一であり、かつ
前記他の部分のねじ山より若干低く配置されてい
る転造ダイスを用いて転造することを特徴とする
方法。 ４ 前記転造ダイスにおいて、不完全ねじ山を成
形するための部分が、正常なねじ山を成形するた
めの他の部分より少なくとも0.2ミリメートル低
く配置されている、特許請求の範囲第３項記載の
方法。 ５ 前記転造ダイスにおいて、不完全ねじ山を成
形するための部分が、ダイスの転がり方向に平行
に、間隔をおいて複数個設けられている、特許請
求の範囲第３項記載の方法。 ６ 前記転造ダイスにおいて、前記不完全ねじ山
を成形するための部分が、正常なねじ山を成形す
るための他の部分と一体的に成形され、かつ両者
のねじ山の角度、ピツチおよびリード角が等し
い、特許請求の範囲第３項記載の方法。 ７ 前記の不完全ねじ山を成形するための転造ダ
イスの部分をダイスチツプとして予め成形し、こ
のダイスチツプを転造ダイスの所定の位置に嵌め
こむことにより形成された転造ダイスを用いる、
特許請求の範囲第３項記載の方法。[Claims] 1. Regions of incomplete threads having an effective diameter larger than the effective diameter of the male thread are provided at a plurality of locations on the screw shaft portion, and the angle and pitch between the incomplete thread and the thread root are different from that of the male thread. A locking screw characterized in that the angle and pitch of the normal thread and thread root of the female thread are equal to each other. 2. Is the effective diameter of the incomplete thread equal to the upper limit of the allowable effective diameter of the female thread that engages with it?
or larger than this, the locking screw according to claim 1. 3. In a method of manufacturing a locking screw using a die, in which areas of the incomplete thread having an effective diameter larger than the effective diameter of the male thread are provided at multiple locations on the screw shaft, the incomplete thread of the die is The thread of the part for forming a normal thread is the same in thread angle, root angle and pitch as the thread of another part for forming a normal thread, and the thread of the other part is the same as the thread of the other part for forming a normal thread. A method characterized by rolling using a rolling die that is placed slightly lower. 4. The rolling die according to claim 3, wherein a portion for forming an incomplete thread is located at least 0.2 mm lower than another portion for forming a normal thread. Method. 5. The method according to claim 3, wherein in the rolling die, a plurality of portions for forming incomplete threads are provided at intervals in parallel to the rolling direction of the die. 6. In the rolling die, the part for forming the incomplete thread is integrally formed with the other part for forming the normal thread, and the angle, pitch and lead of both threads are the same. 4. The method of claim 3, wherein the angles are equal. 7. Using a rolling die formed by pre-forming the part of the rolling die for forming the incomplete thread as a die chip and fitting this die chip into a predetermined position of the rolling die,
A method according to claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4625580A JPS56143813A (en) | 1980-04-10 | 1980-04-10 | Loosening-proof screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4625580A JPS56143813A (en) | 1980-04-10 | 1980-04-10 | Loosening-proof screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56143813A JPS56143813A (en) | 1981-11-09 |
| JPS6343605B2 true JPS6343605B2 (en) | 1988-08-31 |
Family
ID=12742066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4625580A Granted JPS56143813A (en) | 1980-04-10 | 1980-04-10 | Loosening-proof screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56143813A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6338714A (en) * | 1986-08-01 | 1988-02-19 | 株式会社 冨士精密製作所 | Locking bolt |
| JP3999435B2 (en) * | 2000-03-09 | 2007-10-31 | 株式会社コベフォージ | Steel bar joint structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52149550A (en) * | 1976-06-07 | 1977-12-12 | Hiroshi Kajino | Nonnreturn bolt |
| JPS5759143Y2 (en) * | 1978-07-10 | 1982-12-17 |
-
1980
- 1980-04-10 JP JP4625580A patent/JPS56143813A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56143813A (en) | 1981-11-09 |
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