JPS61211510A - Tapping screw - Google Patents
Tapping screwInfo
- Publication number
- JPS61211510A JPS61211510A JP5169385A JP5169385A JPS61211510A JP S61211510 A JPS61211510 A JP S61211510A JP 5169385 A JP5169385 A JP 5169385A JP 5169385 A JP5169385 A JP 5169385A JP S61211510 A JPS61211510 A JP S61211510A
- Authority
- JP
- Japan
- Prior art keywords
- thread
- groove
- screw
- rolling
- 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.)
- Pending
Links
Landscapes
- Contacts (AREA)
- Dowels (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
プラスチック材、木材、その他可塑性材料に設けたねじ
工大内にねじ込んでいって、その内壁にねじ山を形成さ
せると同時に、締めつけを終わらせる形式のタッピンね
じ、特に谷底に平ら部を比較的多くもつ丸形状のタッピ
ンねじ(例えば日本工業規格のタッピンねじ1種、2種
、4種部〕に関するものである。[Detailed description of the invention] Industrial application field A type of tapping that is screwed into a screw thread provided in plastic materials, wood, and other plastic materials to form a thread on the inner wall and simultaneously finish tightening. This invention relates to screws, particularly round tapping screws with a relatively large number of flat portions at the bottom (for example, tapping screws of type 1, type 2, and type 4 of the Japanese Industrial Standards).
従来の技術
従来この分野では、ねじ工大内へのめねじの形成を容易
にし、締めつけ後の保持力を増大させるために、■ねじ
の外径に対してピッチをよシ粗くし、・、りねじ山の角
度を60’ よシ小さくして45以下(時には30°
位にしたものもある。〕にしたものが多く用いられてき
た。これは、ねじ山の角度が小さくてピッチの粗いねじ
では、ねじ込んでいく場合、相手材料を押し分けていく
量が少なくてタッピングが容易となり、その反面、材料
への食い込みを比較的大きくすることができるからであ
る。しかしながら、タッピンねじが転造によって製作さ
れる場合には、外径に対するピッチの割合が大きくなる
程、また、ねじ山の角度が小さくなる程、転造加工は困
難となるのが普通であっろう。ピッチを粗くすること、
すなわち、谷底の平ら部を長くすることにも限界があり
、これを自由に長く選定することは非常に困難なことで
あった。このため、谷底の平ら部を適当にへこませた形
状(例えば公開特許公報昭59−131014)とした
)、ねじ山とねじ山との間にさらにこれよシ+低いねじ
山を配列する(例えば特許公報昭53−43625)等
の方法を講じて転造がし易いようにし、できるだけピッ
チを大きくすることが行われてきたのである。Conventional Technology Conventionally, in this field, in order to facilitate the formation of female threads in screw threads and increase the holding force after tightening, Reduce the thread angle by 60' to 45 or less (sometimes 30°)
There are also some that have been ranked. ] have been widely used. This is because when a screw with a small thread angle and a coarse pitch is screwed in, the amount of pushing away from the mating material is small, making it easier to tap, but on the other hand, it is difficult to make a relatively large amount of penetration into the material. Because you can. However, when self-tapping screws are manufactured by rolling, the rolling becomes more difficult as the ratio of the pitch to the outer diameter increases and the thread angle decreases. . coarsening the pitch,
In other words, there is a limit to how long the flat part of the valley bottom can be, and it is extremely difficult to freely select the length. For this purpose, the flat part of the valley bottom is appropriately recessed (for example, Japanese Patent Publication No. 59-131014)), and further lower threads are arranged between the threads ( For example, methods such as those described in Japanese Patent Publication No. 53-43625 have been used to make rolling easier and to increase the pitch as much as possible.
発明が解決しようとする問題点
谷底の平ら部を自由に長く設定することができて、しか
も転造によるねじ山の成形を円滑、容易に行わせること
ができるようなタッピンねじの新規なねじ山の形を見出
すこと、これが本発明が解決しようとする問題点である
。Problems to be Solved by the Invention A novel screw thread for a self-tapping screw that allows the flat part of the root to be freely set to a long length, and also enables the thread to be smoothly and easily formed by rolling. This is the problem that the present invention seeks to solve.
、!。,! .
問題、を解決するための手段
本発明では、前記の問題点を解決するにあたシ、次の二
つの事項を重点目標としてとシ挙げた0すにおける、転
造による変形量をできる限シ少なくして、平ら部の長さ
の大部分においては、ねじ転造ブランク径をほとんどそ
のままの形で残すようにすること。この二つの目標を達
成し、具体化するための手段として、特殊な断面形をも
った本発明のタッピンねじが見出されるに至ったのであ
る。In order to solve the above-mentioned problems, the present invention aims to reduce the amount of deformation due to rolling as much as possible with the following two points as important goals. For most of the length of the flat part, the diameter of the thread rolling blank should be left almost unchanged. As a means to achieve and embody these two goals, the self-tapping screw of the present invention having a special cross-sectional shape was discovered.
実施例
第2図において、公知の頭部1と一体にねじ部2がある
。ねじ部2に設けられているねじは谷底に平ら部を大き
くもったタッピンねじの形状としである。ねじ部2の断
面形は第1図に拡大して示しであるように、ねじ山の角
度約45° のねじ山6が一定のピッチで配列されてお
シ、山の頂4はすべてA線にそろえられて一定の外径り
をもたせである。山の頂4には通常面取シ程度の平ら部
が設けられる。実質的には円筒面である谷底の平ら部5
はすべてB線にそろえられて一定の谷の径d−tをもっ
ているが、ねじ山とねじ山との間を全部直線で占めてい
る訳ではない。ねじ山3の基部6の両側には、すべて一
様に、連続したみぞ7が設はイ11
られ、このみぞ7の最妾部8はC線にそろえられている
。図面ではみぞ7は台形を逆にした形状となっておシ、
その底辺は軸線9に平行な直線で、角部に小さな丸みを
もたせた形状として示され、みぞ7の両辺10.11
(ねじ山側の辺を10、これと反対側の辺を11とする
。)はフランク角に合わせた直線であり、ねじ山3の側
の辺10はねじ山6のフランクの延長線と一致させてあ
る。In the embodiment shown in FIG. 2, there is a threaded part 2 integrated with the known head 1. The screw provided in the threaded portion 2 is in the shape of a self-tapping screw with a large flat portion at the root. As shown in the enlarged view in Fig. 1, the cross-sectional shape of the threaded portion 2 has threads 6 with a thread angle of approximately 45° arranged at a constant pitch, and the tops 4 of the threads are all aligned with line A. They are aligned to have a constant outer diameter. The top 4 of the mountain is usually provided with a flat portion of the size of a chamfer. Flat portion 5 of the valley bottom which is substantially a cylindrical surface
are all aligned with the B line and have a constant valley diameter d-t, but the spaces between the threads are not all straight lines. A continuous groove 7 is uniformly provided on both sides of the base 6 of the thread 3, and the innermost part 8 of this groove 7 is aligned with the C line. In the drawing, groove 7 is shaped like an inverted trapezoid.
Its base is shown as a straight line parallel to the axis 9, with small rounded corners, and both sides 10.11 of the groove 7
(The side on the thread side is 10, and the side on the opposite side is 11.) is a straight line that matches the flank angle, and the side 10 on the thread 3 side is aligned with the extension line of the flank of thread 6. There is.
このみぞ7は平ら部5を連ねた線Bよシも深く形成し、
平ら部の直径すなわち谷の径47はほぼこのねじのねじ
転造プ2yり径と等しくなるように形成しである。This groove 7 is also formed deeper than the line B connecting the flat parts 5,
The diameter of the flat portion, that is, the diameter of the valley 47 is formed to be approximately equal to the diameter of the thread rolling hole 2y of this screw.
径ttとほぼ等しいねじ転造ブランク径をもった丸棒素
材を使ってこのねじを転造する場合に1ねじ山3の盛シ
上がシがじゅうぶん効果的に行われるだけの断面積をも
たせること。実際には、ねじ山3のC線よシ上の断面積
の%とB線よシ下のみぞ7の断面積とがほぼ等しくなる
位をめやすとして決められるが、谷底の平ら部5の長さ
と関連して、最終的には、実験によって決めるのが望ま
しい。When rolling this screw using a round bar material with a thread rolling blank diameter that is approximately equal to the diameter tt, the cross-sectional area should be large enough to effectively roll up one thread 3. thing. In reality, the percentage of the cross-sectional area above the line C of the thread 3 is determined to be approximately equal to the cross-sectional area of the groove 7 below the line B, but the length of the flat part 5 at the bottom of the valley is determined. In connection with this, it is desirable to ultimately determine this by experiment.
みぞ7によってその分だけ短くなった平ら部5の直線部
の長さは、みぞ7の8線上の幅よりも大きくし、少なく
ともその2.5倍以上あるようにするのが普通である。The length of the straight portion of the flat portion 5 shortened by the groove 7 is generally larger than the width of the groove 7 on the line 8, and is at least 2.5 times longer than the width of the groove 7 on the line 8.
みぞ7の別の実施例を第3図に示しである。これは、ね
じ山3の基部60両側に底に丸みをつけたV字形のみぞ
7を設けである形状で、みぞ7の角度θはどんな場合で
もねじ山3の角度よシ犬きくなるように形成しておくこ
とが望ましい。第3図では、ねじ山6の角度は約45、
みその角度θは約90°である。Another embodiment of the groove 7 is shown in FIG. This has a shape in which a V-shaped groove 7 with a rounded bottom is provided on both sides of the base 60 of the screw thread 3, and the angle θ of the groove 7 is set to be larger than the angle of the thread 3 in any case. It is desirable to form it. In Figure 3, the angle of the thread 6 is approximately 45,
The angle θ of the miso is approximately 90°.
みぞ7の形状は、これ等二つの実施例のものに限定され
るものではなく、先に示したような条件を満たすもので
あれば、他のどんな形状であってもよいことは、今まで
の説明から理解されるであろう。すなわち、第1図、第
3図のものについていえばみぞ7の底辺は曲線であって
もよいし、底に丸みをもたないシャープなV字形のもの
であってもよいのである。It has been previously understood that the shape of the groove 7 is not limited to those of these two embodiments, and may be any other shape as long as it satisfies the conditions shown above. This will be understood from the explanation. That is, in the case of FIGS. 1 and 3, the bottom of the groove 7 may be a curved line, or may be a sharp V-shape with no roundness at the bottom.
発明の作用、効果
本発明は実施例に示したように構成されているよシも小
径にした先端の案内部12よシこのねじを挿入し、ねじ
込んで使用する。この場合、谷底の平ら部5の円筒面は
ねじ下穴の内壁と常に面接触して、タッピングのガイド
となって作用し、その接触面積は非常に大きいから、ね
じ下穴の中心とねじの中心とは常に一致し、曲ってねじ
込まれることはない。また、ねじ山3が相手材料を押し
分けて食い込んでいくとき、平ら部5が完全に相手材料
のこの部分の変形を押さえておシ、変形はねじ山3の部
分に限定されて起こるから、相手材料の変形した部分は
すべてねじ6の7ランクに沿ってみぞ7の空間に押し込
まれ、この中に収容されることになる。このため、摩擦
抵抗は全般的に増加し、このねじの戻しトルクは締めつ
けトルクよシも犬きくなシゆるみ止めの効果は抜群であ
る。Functions and Effects of the Invention The present invention is used by inserting and screwing the screw through the guide portion 12 at the tip, which has a smaller diameter than that configured as shown in the embodiment. In this case, the cylindrical surface of the flat part 5 of the root is always in surface contact with the inner wall of the screw pilot hole and acts as a tapping guide, and since the contact area is very large, the center of the screw pilot hole and the screw It always aligns with the center and never gets bent or screwed. Furthermore, when the thread 3 pushes apart the mating material and bites into it, the flat part 5 completely suppresses the deformation of this part of the mating material, and the deformation occurs only in the thread 3 part. All the deformed parts of the material will be forced into the space of the groove 7 along the seven ranks of the screw 6 and will be accommodated therein. Therefore, the frictional resistance increases overall, and the return torque of this screw is much stronger than the tightening torque, making it extremely effective in preventing loosening.
いキーを打ち込んで締めつけた状態に似ているから外力
によって緩むことが少ない。コンクリート材のような硬
くてもろい材料に使用した場合にも、掻きとられ一部圧
縮されたみその中にねじるが入り、破砕された粉状物は
みぞ7に押し込まれることになって良好に使用できるこ
とが分かつている。It's similar to pressing a key in and tightening it, so it's less likely to loosen due to external force. Even when used on hard and brittle materials such as concrete, the torsion will enter the scraped and partially compressed material, and the crushed powder will be pushed into the groove 7, making it a good product. I know it can be used.
次に、転造によってこのねじを製作する場合には、まず
みぞ7の部分に転造ダイスの相当する部分が押し込まれ
て、ねじ山3を盛シ上げていくことになるが、平ら部5
の側へも当然材料の盛シ上すが起こる。平ら部5におけ
る、この材料の盛シ上すによる谷の径J、の増加量は、
平ら部5の長さにもよるが、ねじ山6の外径dの増加量
よシもかな)少なく、転造ダイスでこの部分を押しつけ
てならすことによシ、谷底の平ら部5をほぼ一様に仕上
げることができるのである。平ら部5の長さが長い程、
ねじ転造ブランク径と谷底の平ら部5の直径d、との差
は小さくなる。実験によれば、転造による変形量は平ら
部5の長さの大部分においてはねじ転造ブランク径とほ
ぼ等しく、その両端付近においてやや大きくなる傾向で
あるが、全体がほぼ一様な寸法に仕上がることが分かっ
た。これ等のことは、この断面をもった本発明のねじで
は、転造による塑性変形が極めて局部的に限定された状
態で行われるものであることを示している。Next, when manufacturing this screw by rolling, the corresponding part of the rolling die is first pushed into the groove 7 to raise the thread 3, but the flat part 5
Naturally, material buildup also occurs on the side of the machine. The amount of increase in the diameter J of the valley due to the heaping of this material in the flat part 5 is:
Although it depends on the length of the flat part 5, the amount of increase in the outer diameter d of the thread 6 may be less), and by pressing and smoothing this part with a rolling die, the flat part 5 at the bottom of the root can be almost flattened. It can be finished uniformly. The longer the length of the flat part 5,
The difference between the diameter of the thread rolling blank and the diameter d of the flat portion 5 at the root becomes small. According to experiments, the amount of deformation due to rolling is almost equal to the diameter of the thread rolling blank over most of the length of the flat part 5, and tends to be slightly larger near both ends, but the overall dimension is almost uniform. I found out that it ended up being . These facts indicate that in the screw of the present invention having this cross section, plastic deformation due to rolling occurs in a very locally limited state.
また、転造中のブランクの転がシ円は従来のねじと比べ
て終始変動が極めて少なくほぼ一定の値を保ち安定して
いるから、転造作業は極めて円滑、容易に行われること
になる。In addition, the rolling circle of the blank during rolling has very little fluctuation throughout the process compared to conventional screws, and remains stable at a nearly constant value, making rolling work extremely smooth and easy. .
さらに、第1図、第3図に示したようなみぞ7の形状は
、いずれも反対面としての転造ダイスのねじ面に、平ら
な部分あるいは大きな角度の山をもった部分があること
を示しているが、このような形状は転造ダイスの耐久力
が非常によくなるということを意味している。Furthermore, the shapes of the grooves 7 as shown in Figures 1 and 3 indicate that the threaded surface of the rolling die, which is the opposite surface, has a flat portion or a portion with large ridges. As shown, such a shape means that the rolling die has very good durability.
本発明は、先行特許第579893号(特公昭43−2
6’/43、非円形ネジ転造用波形ネジダイス〕を利用
することによシ、可塑性金属に使用することのできる非
円形のタッピンねじにも適用することができる。The present invention is based on prior patent No. 579893 (Japanese Patent Publication No. 43-2
6'/43, a wave-shaped thread die for rolling non-circular threads], it can also be applied to non-circular tapping screws that can be used for plastic metals.
第2図は本発明タッピンねじの側面図、第1図は第2図
におけるねじ部断面形の拡大説明図、第3図は他の実施
例におけるねじ部断面形の拡大説明図である。
1000頭部、200.ねじ部、601.ねじ山、40
0.山の頂、5.、、谷底の平ら部、600.ねじ山の
基部、760.みぞ、810.みぞ9最低部、910.
軸線、10。0.みぞのねじ山側の辺、11.、、みぞ
のねじ山と反対側の辺、12.、、案内部。
Aoo、ねじ山の頂を連ねた線、B80.谷底の平ら部
を連ねた線、C06,みぞの最低部を連ねた線。
C90,外径、i、、、、谷の径、C0,。7字形のみ
その角度。FIG. 2 is a side view of the self-tapping screw of the present invention, FIG. 1 is an enlarged explanatory view of the cross-sectional shape of the threaded portion in FIG. 2, and FIG. 3 is an enlarged explanatory view of the cross-sectional shape of the threaded portion in another embodiment. 1000 heads, 200. Threaded portion, 601. screw thread, 40
0. The top of the mountain, 5. ,, flat part of the valley floor, 600. Base of thread, 760. Groove, 810. Bottom of groove 9, 910.
Axis, 10.0. Thread side of groove, 11. ,, the side opposite the thread of the groove, 12. ,, Information Department. Aoo, line connecting the tops of the threads, B80. A line connecting the flat part of the valley floor, C06, a line connecting the lowest part of the groove. C90, outer diameter, i, ..., valley diameter, C0,. Only the angle of the figure 7.
Claims (1)
、ねじ山の基部の両側には、すベて一様に、平ら部より
も深く、ねじ山の断面積のほぼ1/2の断面積をもった
連続したみぞを刻設し、前記平ら部の円筒面はすべて軸
方向にそろえられて一定の直径d_1をもち、平ら部の
長さはみぞの幅よりも大きく、その直径d_1はねじ転
造ブランク径とほぼ等しくなるように形成してあること
を特徴とするタッピンねじ。 2 みぞ7は台形を逆にした形状とし、その両辺10、
11はフランク角に合わせた直線であり、ねじ山側の辺
10はフランクの延長線と一致させてある特許請求の範
囲第1項記載のタッピンねじ。 3 みぞ7の形状はV字形とし、その角度θは常にねじ
山3の角度よりも大きくなるようにしてある特許請求の
範囲第1項記載のタッピンねじ。[Scope of Claims] 1. In a screw having a shape with a large flat portion at the root, the base of the screw thread is uniformly deeper on both sides than the flat portion and has a thickness of about 1 of the cross-sectional area of the thread. A continuous groove with a cross-sectional area of A tapping screw characterized in that its diameter d_1 is formed to be approximately equal to the diameter of a thread rolling blank. 2 Groove 7 has the shape of an inverted trapezoid, and both sides 10,
The tapping screw according to claim 1, wherein 11 is a straight line that matches the flank angle, and the side 10 on the thread side is made to match the extension line of the flank. 3. The tapping screw according to claim 1, wherein the groove 7 has a V-shape, and the angle θ thereof is always larger than the angle of the thread 3.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5169385A JPS61211510A (en) | 1985-03-15 | 1985-03-15 | Tapping screw |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5169385A JPS61211510A (en) | 1985-03-15 | 1985-03-15 | Tapping screw |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61211510A true JPS61211510A (en) | 1986-09-19 |
Family
ID=12893978
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5169385A Pending JPS61211510A (en) | 1985-03-15 | 1985-03-15 | Tapping screw |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61211510A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008256093A (en) * | 2007-04-05 | 2008-10-23 | Koyo Kizai Kk | Tapping screw for concrete product |
CN113557364A (en) * | 2018-09-20 | 2021-10-26 | 美国辛普森众泰公司 | Fastener with continuous relief region |
US11739783B2 (en) | 2021-04-30 | 2023-08-29 | Simpson Strong-Tie Company Inc. | Concrete fastener |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55112414A (en) * | 1979-02-22 | 1980-08-30 | Edowaado Gutsutoshi Chiyaarusu | Rolled screw with long pitch |
-
1985
- 1985-03-15 JP JP5169385A patent/JPS61211510A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55112414A (en) * | 1979-02-22 | 1980-08-30 | Edowaado Gutsutoshi Chiyaarusu | Rolled screw with long pitch |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008256093A (en) * | 2007-04-05 | 2008-10-23 | Koyo Kizai Kk | Tapping screw for concrete product |
CN113557364A (en) * | 2018-09-20 | 2021-10-26 | 美国辛普森众泰公司 | Fastener with continuous relief region |
JP2022502609A (en) * | 2018-09-20 | 2022-01-11 | シンプソン ストロング タイ カンパニー インコーポレーテッド | Fastener with continuous detent area |
US11739783B2 (en) | 2021-04-30 | 2023-08-29 | Simpson Strong-Tie Company Inc. | Concrete fastener |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS623529Y2 (en) | ||
US5088869A (en) | Thread rolling screw | |
US4040328A (en) | Thread-forming fastener having dual lobulation and dies for making the same | |
US2352982A (en) | Screw for plastics | |
US6540619B2 (en) | Bolt and a manufacturing method thereof | |
US5242253A (en) | Thread-forming screw | |
US4194430A (en) | Thread-forming screw with step taper | |
EP1066473B1 (en) | Improved self-tapping thread fastener and a blank therefor | |
US5044855A (en) | Thread-forming fasteners | |
JPH0646044B2 (en) | Asymmetric thread forming screw and manufacturing method thereof | |
JPS584207B2 (en) | Nejiyamas Ekomine Neji | |
US2896495A (en) | Self-threading nut | |
US4144795A (en) | Long-pitch re-rolled crest thread | |
DE1400229B1 (en) | Self-threading screw | |
US20080080953A1 (en) | Screw for plastic articles | |
US3772720A (en) | Method for making a thread forming member | |
US4222689A (en) | Drilling and tapping screw | |
US6899500B2 (en) | Fastner having multiple-bossed lead | |
US4536117A (en) | Screw fastener | |
DE2035151A1 (en) | Self-tapping screw | |
JP3604325B2 (en) | Rolling dies for rod-end screws | |
JPS61211510A (en) | Tapping screw | |
JP3046746B2 (en) | Screw and screw manufacturing method | |
JP2724099B2 (en) | Fastening member and method of manufacturing the same | |
JP3942243B2 (en) | Rolled screw and its manufacturing method |