JPH11201344A - Pipe joint - Google Patents
Pipe jointInfo
- Publication number
- JPH11201344A JPH11201344A JP10015046A JP1504698A JPH11201344A JP H11201344 A JPH11201344 A JP H11201344A JP 10015046 A JP10015046 A JP 10015046A JP 1504698 A JP1504698 A JP 1504698A JP H11201344 A JPH11201344 A JP H11201344A
- Authority
- JP
- Japan
- Prior art keywords
- thread
- male
- female
- tapered
- screw
- 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.)
- Granted
Links
- 238000003780 insertion Methods 0.000 claims description 27
- 230000037431 insertion Effects 0.000 claims description 27
- 238000005520 cutting process Methods 0.000 claims description 16
- 238000003754 machining Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000000573 anti-seizure effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/06—Screw-threaded joints; Forms of screw-threads for such joints characterised by the shape of the screw-thread
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、油井管、土木杭管
等のテーパねじ継手において、ピンのテーパ雄ねじ部を
ボックスのテーパ雌ねじ部に垂直方向に差し込み、引き
続き回転して締め込む際に、作業性を向上可能な管継手
に関する。BACKGROUND OF THE INVENTION The present invention relates to a tapered threaded joint for oil country tubular goods, civil engineering pile pipes, etc., in which a tapered male threaded part of a pin is vertically inserted into a tapered female threaded part of a box, and subsequently rotated and tightened. The present invention relates to a pipe joint capable of improving workability.
【０００２】[0002]
【従来の技術】従来、油（ガス）井の坑井保護、採油及
び掘削に使用される油井管（ケーシングパイプ、チュー
ビングパイプ、ドリルパイプ）又は土木用鋼管杭等、施
工又は使用時に鋼管を縦方向に継いでいく管用テーパね
じ継手に関して、ピンのテーパ雄ねじ部をボックスのテ
ーパ雌ねじ部に垂直方向に差し込み、初期ねじ込みを開
始するまでの作業（スタビング性）及びその後のねじ込
み作業を容易かつ迅速にする管継手の一例として、図９
（Ａ）に示すような形態の管継手５０ａが知られてい
る。管継手５０ａにおいては、管５０のピン５１のテー
パ雄ねじ部５２と短管５３のボックス５４のテーパ雌ね
じ部５５が嵌合する管用テーパ角ねじ継手が使用されて
いる。この管用テーパ角ねじ継手のねじ込み開始の状況
を図９（Ｂ）に拡大図で示している。管用テーパ角ねじ
継手のスタビング性を判りやすく説明するために、テー
パ雄ねじ部５２及びテーパ雌ねじ部５５の雄、雌ねじ山
５６、５７の形状を同一とし、それぞれの雄、雌ねじ山
頂面５８、５９はテーパ面Ｔf に平行とする。図に示す
嵌合断面図は、まさに雄ねじ山５６が雌ねじ山５７に噛
み込もうとするところを示している。つまり、テーパ雄
ねじ部５２の雄ねじ山頂面５８を連ねたテーパ面とテー
パ雌ねじ部５５の雌ねじ山頂面５９を連ねたテーパ面が
丁度競っており、かつ雄ねじ山５６が雌ねじ山５７の谷
部６０に位置するように、テーパ雄ねじ部５２の円周方
向位置とテーパ雌ねじ部５５の円周方向位置を揃えた図
としている。図から明らかなように、このままのねじ形
状ではテーパ雄ねじ部５２をテーパ雌ねじ部５５にねじ
込むことは不可能である。2. Description of the Related Art Conventionally, steel pipes such as oil well pipes (casing pipes, tubing pipes, drill pipes) or steel pipe piles for civil engineering used for well protection, oil extraction and drilling of oil (gas) wells are used for vertical construction or construction. For the tapered threaded joint for pipes to be joined in the direction, insert the tapered male thread of the pin into the tapered female thread of the box in the vertical direction, and start the initial screwing (stubbing) and the subsequent screwing work easily and quickly. FIG.
A pipe joint 50a having a configuration as shown in FIG. In the pipe joint 50a, a pipe taper angle threaded joint is used in which the tapered male screw part 52 of the pin 51 of the pipe 50 and the tapered female screw part 55 of the box 54 of the short pipe 53 fit. FIG. 9 (B) is an enlarged view of a state where the threading of the pipe taper angle threaded joint is started. In order to easily explain the stubbing property of the tapered pipe threaded joint for pipes, the male and female threads 56 and 57 of the tapered male thread portion 52 and the tapered female thread portion 55 have the same shape, and the male and female thread crests 58 and 59 have the same shape. Let it be parallel to the tapered surface Tf . The fitting cross-sectional view shown in the figure shows just the case where the male thread 56 is about to bite into the female thread 57. In other words, the tapered surface of the tapered male screw portion 52 connected to the external thread crest surface 58 and the tapered surface of the tapered female screw portion 55 connected to the female screw crest surface 59 exactly compete with each other. The position of the tapered male screw portion 52 in the circumferential direction and the tapered female screw portion 55 in the circumferential direction are aligned so as to be positioned. As is apparent from the drawing, it is impossible to screw the tapered male screw part 52 into the tapered female screw part 55 with the screw shape as it is.
【０００３】ここで、管用テーパ角ねじ継手のスタビン
グ性の正体について明らかにするために、図１０（Ｂ）
に示すように、油井管ねじとして広く用いられているＡ
ＰＩバットレスねじ継手の場合を例にして、いかにして
テーパ雄ねじ部６１がテーパ雌ねじ部６２に差し込まれ
た後、雄、雌ねじ山６３、６４がねじ込まれる仕掛けに
なっているかを説明する。ＡＰＩバットレスねじ要素
は、テーパＴ＝１／１６（又は６２．５ｍｍ／ｍ、直径
に対する変化率）、ピッチＰ＝５．０８ｍｍ、ねじ山高
さＨ＝１．５７５ｍｍ、スタビングフランク角η＝１０
°、ロードフランク角γ＝３°、雄、雌ねじ山頂面６
５、６６の直線部はテーパ面Ｔp （即ち、ピッチライ
ン）に平行、雄、雌ねじ山頂面６５、６６のコーナＲ＝
０．７６ｍｍ、又は０．２０ｍｍなどを特徴としてい
る。図１０（Ａ）はテーパ雄ねじ部６１とテーパ雌ねじ
部６２がねじ込みのために最も都合の良い周方向に填ま
り込んだ状況を示している。前記管用テーパ角ねじ継手
の場合とは異なり、テーパ雌ねじ部６２の谷部６７の開
口部６８は雄ねじ山６３の雄ねじ山頂面６５より幅広く
できており、この状態からテーパ雄ねじ部６１を下方に
落下させると、テーパ雄ねじ部６１の雄ねじ山６３のコ
ーナ部６９は、テーパ雌ねじ部６２の雌ねじ山６４のコ
ーナ部７０に僅かに載ることができ、その状態からテー
パ雄ねじ部６１を回せば、テーパ雄ねじ部６１は螺旋に
沿って填まり込んでいくことになる。[0003] Here, in order to clarify the stubbing properties of the tapered pipe threaded joint for pipes, FIG.
As shown in the figure, A
Using a PI buttress threaded joint as an example, how the male and female threads 63 and 64 are screwed after the tapered male thread 61 is inserted into the tapered female thread 62 will be described. The API buttress screw element has a taper T = 1/16 (or 62.5 mm / m, rate of change to diameter), pitch P = 5.08 mm, thread height H = 1.575 mm, stubbing flank angle η = 10
°, road flank angle γ = 3 °, male, female thread crest surface 6
The straight portions 5 and 66 are parallel to the tapered surface T p (that is, the pitch line), and the corners R of the male and female thread crests 65 and 66 are R =
It is characterized by 0.76 mm or 0.20 mm. FIG. 10A shows a situation in which the tapered male screw portion 61 and the tapered female screw portion 62 are fitted in the most convenient circumferential direction for screwing. Unlike the case of the pipe taper angle threaded joint, the opening 68 of the valley 67 of the tapered female thread portion 62 is wider than the male thread top surface 65 of the male thread 63, and the tapered male thread portion 61 falls downward from this state. Then, the corner portion 69 of the external thread 63 of the tapered external thread portion 61 can be slightly placed on the corner portion 70 of the internal thread 64 of the tapered internal thread portion 62. The part 61 will fit along the spiral.
【０００４】また、このようにテーパ雄ねじ部６１がテ
ーパ雌ねじ部６２に填まり込むためには、必ずしも雄ね
じ列と雌ねじ列の相対位置は図１０（Ａ）の通りでなく
てもよく、雄ねじ山６３のスタビングフランク面７１の
コーナＲが雌ねじ山６４のスタビングフランク面７２の
コーナＲに接するところまで、テーパ雄ねじ部６１を図
１０（Ａ）の位置より下方にずらせた位置でも、テーパ
雄ねじ部６１はテーパ雌ねじ部６２に填まり込むことが
できる。つまり、このずれに相当する周方向角度の分だ
け、テーパ雄ねじ部６１をテーパ雌ねじ部６２に差し込
んだ時、旨くねじ込むための周方向範囲に裕度を持たせ
ることができる。通常の差し込み、ねじ込み開始作業で
は、テーパ雄ねじ部６１をテーパ雌ねじ部６２に差し込
み、旨くテーパ雄ねじ部６１の雄ねじ山６３をテーパ雌
ねじ部６２の雌ねじ山６４に預けることのできる前記周
方向位置まで、テーパ雄ねじ部６１を回転させる。この
時は、まだ雄ねじ山６３と雌ねじ山６４は噛み合ってい
ないので、テーパ雄、雌ねじ部６１、６２のそれぞれの
軸心が一致していないとかじりを起こすこともあり、直
径の大きい鋼管では、回転角が大きいと作業も大変であ
る。従って、雄ねじ山６３と雌ねじ山６４が噛み込める
周方向位置の範囲が広い程、適切な場所まで回転させる
回転角を小さくすることができ、スタビング性の良いテ
ーパねじ継手といえる。また、テーパ雌ねじ部６２の谷
部６７の開口部６８の幅Ｗと雄ねじ山頂面６５の幅Ｖと
の隙間Ｇが大きいことの利点は、この隙間Ｇ分だけテー
パ雄ねじ部６１を落とし込んでテーパ雌ねじ部６２の雌
ねじ山６４のスタビングフランク面７２に預けた時、
（管軸方向の隙間Ｇ×テーパＴ）／２の半径方向預け代
が確保できるので、安定したねじ込みができることであ
る。In order for the tapered male screw portion 61 to fit into the tapered female screw portion 62, the relative positions of the male screw array and the female screw array do not necessarily have to be as shown in FIG. Even when the tapered male screw portion 61 is shifted downward from the position shown in FIG. 10A until the corner R of the stubbing flank surface 63 of 63 contacts the corner R of the stubbing flank surface 72 of the female screw thread 64, The portion 61 can fit into the tapered female screw portion 62. That is, when the tapered male screw portion 61 is inserted into the tapered female screw portion 62 by an amount corresponding to the circumferential direction angle corresponding to this deviation, it is possible to have a margin in the circumferential direction range in which the screw is successfully screwed. In a normal insertion and screwing start operation, the tapered male screw portion 61 is inserted into the tapered female screw portion 62, and the male thread 63 of the tapered male screw portion 61 is satisfactorily deposited to the female thread 64 of the tapered female screw portion 62 until the circumferential position. The tapered male screw part 61 is rotated. At this time, since the male thread 63 and the female thread 64 are not yet meshed with each other, if the axes of the tapered male and female threads 61 and 62 do not coincide, galling may occur. If the rotation angle is large, the work is also difficult. Therefore, as the range of the circumferential position where the male thread 63 and the female thread 64 can bite is wider, the rotation angle for rotating to an appropriate place can be reduced, and it can be said that the tapered thread joint has a good stubbing property. The advantage that the gap G between the width W of the opening 68 of the valley 67 of the tapered female screw portion 62 and the width V of the male screw crest surface 65 is large is that the tapered female screw portion 61 is dropped by the amount of the gap G to form a tapered female screw. When deposited on the stubbing flank surface 72 of the internal thread 64 of the portion 62,
Since a margin in the radial direction of (gap G in the pipe axis direction × taper T) / 2 can be ensured, a stable screw-in is possible.
【０００５】以上の説明から判るように、スタビング性
は、テーパ雄ねじ部６１をテーパ雌ねじ部６２に差し込
んだ時、その位置からそのままねじ込みを開始すること
が可能な円周方向の範囲（θ）が広い程、またねじ込み
を開始する時、雄ねじ山６３のスタビングフランク面７
１を雌ねじ山６４のスタビングフランク面７２に預けて
いる奥行きδ（前記半径方向預け代と同じ）が広い程、
良好ということになる。そこで、このスタビング性を支
配するθ、δを大きく取るために、従来のテーパねじ継
手の形態について幾つかの例で説明する。まず、ＡＰＩ
バットレスねじ継手について説明すると、図１０（Ｂ）
に示すように、第１にテーパ雄ねじ部６１の雄ねじ山６
３のスタビングフランク面７１の角度、即ちスタビング
フランク角ηを管軸Ｃに垂直な面から１０°傾けてい
る。このスタビングフランク角ηの傾きが大きい程、填
まり込みの隙間Ｇは広くなる。第２に、テーパ雄ねじ部
６１の雄ねじ山６３のスタビングフランク面７１のコー
ナ部６９のＲ＝０．７６ｍｍをとり、さらにこの隙間Ｇ
を広げている。その他、テーパ雄ねじ部６１を僅かに
（直径で０．０３ｍｍ）テーパ雌ねじ部６２より痩せた
ねじにしたり、雄、雌ねじ山頂面６５、６６とロードフ
ランク面７３、７４とのコーナ部７５、７６のＲを僅か
にとる（図１０（Ｂ）ではＲ＝０．２０ｍｍ）ことに依
っても僅かに隙間Ｇを広げている。この場合の全ての隙
間の総和は約１．７５ｍｍと試算される。これを円周方
向の範囲（θ）に換算すると、θ＝（３６０°×１．７
５）／５．０８＝１２４°となる。一方、奥行き（δ）
はδ＝１．７５／３２＝０．０５５ｍｍとなる。図９の
角ねじに比べねじ込みの範囲がでてきているが、積極的
にねじ込み易くしているとは言えない。As can be understood from the above description, the stubbing property is such that when the tapered male screw portion 61 is inserted into the tapered female screw portion 62, the range (θ) in the circumferential direction in which screwing can be started directly from that position. The larger the width, the more the stubbing flank surface 7 of the external thread 63 when starting screwing.
1 is larger on the stubbing flank surface 72 of the female screw thread 64, the larger the depth δ (same as the above radial deposit),
It means good. Therefore, in order to increase θ and δ that govern the stubbing property, some examples of a conventional tapered threaded joint will be described. First, API
The buttress screw joint will be described with reference to FIG.
First, as shown in FIG.
The angle of the stubbing flank surface 71, that is, the stubbing flank angle η, is inclined by 10 ° from a plane perpendicular to the tube axis C. The larger the inclination of the stub flank angle η, the larger the gap G for filling. Secondly, R = 0.76 mm of the corner portion 69 of the stubbing flank surface 71 of the external thread 63 of the tapered external thread portion 61 is taken.
Is spreading. In addition, the tapered male screw part 61 may be slightly (0.03 mm in diameter) thinner than the tapered female screw part 62, or the corners 75, 76 of the male and female screw crest surfaces 65, 66 and the load flank surfaces 73, 74 may be formed. The gap G is slightly widened even when R is slightly set (R = 0.20 mm in FIG. 10B). The total sum of all the gaps in this case is estimated to be about 1.75 mm. When this is converted into a range (θ) in the circumferential direction, θ = (360 ° × 1.7)
5) /5.08=124° On the other hand, depth (δ)
Is δ = 1.75 / 32 = 0.055 mm. Although the screwing range is larger than that of the square screw in FIG. 9, it cannot be said that the screwing is positively facilitated.
【０００６】また、ＡＲＭＣＯ社製のＳＥＡＬ−ＬＯＣ
Ｋ継手について説明すると、この特殊継手においては、
第１に差し込み側のスタビングフランク角ηを管軸に垂
直な面に対して４５°傾けることにより、実質的に雌ね
じ山の谷部の幅を広げ、スタビング時、テーパ雄ねじ部
の雄ねじ山をテーパ雌ねじ部の谷部に収め易くしてい
る。第２に、雄、雌ねじ山頂面を管軸に平行とし、テー
パ雄ねじ部をテーパ雌ねじ部に差し込む時、雄ねじ山と
雌ねじ山同士が競るところを少なくしている。さらに、
ＶＥＴＣＯ−ＧＲＡＹ社製の特殊継手においては、４条
ねじを適用することにより、一周３６０°の内、４ヶ所
のねじ込み可能箇所ができるので、テーパ雄ねじ部をテ
ーパ雌ねじ部に差し込み後、僅かの回転調整にて容易に
ねじ込みができる。なお、通常の１条ねじでは、ねじ込
み可能箇所は１カ所である。さらに、多条ねじ（ｎ条）
の最大の特徴は、一旦ねじ込みを開始すると１条ねじに
比べ、締まり込み完了までの回転数が１／ｎになること
である。このことは、ロープなどで締め込みを行なう大
径の継手では非常に重要な要素である。他の特殊継手と
して、テーパ雌ねじ部の入り口を長くする（スタビング
ガイドを設ける）ことにより、テーパ雄ねじ部をテーパ
雌ねじ部に差し込む時斜めにならないようにしているも
のがある。Further, SEAL-LOC manufactured by ARMCO, Inc.
To explain the K joint, in this special joint,
First, by inclining the stubbing flank angle η on the insertion side by 45 ° with respect to a plane perpendicular to the tube axis, the width of the valley portion of the female screw thread is substantially widened, and at the time of stubbing, the male screw thread of the tapered male screw portion is reduced. It is easy to fit in the valley of the tapered female thread. Second, when the male and female thread crests are parallel to the pipe axis, and the tapered male thread is inserted into the tapered female thread, the places where the male thread and the female thread compete with each other are reduced. further,
In a special joint manufactured by VETCO-GRAY, four screw threads can be formed at 360 degrees around the circumference by applying a four-start thread. Therefore, after inserting the tapered male thread into the tapered female thread, a slight rotation is required. It can be easily screwed in by adjustment. In addition, in the case of a normal single thread, a screwable portion is one place. Furthermore, multi-start screws (n-start)
The greatest feature of the present invention is that once screwing is started, the number of rotations until completion of tightening becomes 1 / n compared to a single thread screw. This is a very important factor for large diameter joints that are tightened with ropes or the like. As another special joint, there is a special joint in which the entrance of the tapered female thread is lengthened (provided with a stubbing guide) so that the tapered male thread is not inclined when inserted into the tapered female thread.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、前記従
来の管継手においては、未だ解決すべき以下のような問
題があった。１条ねじの形態のものでは、差し込み位置
が必ずしもねじ込み開始位置とならず、ねじ込み位置を
探るためテーパ雄ねじ部を回転しなければならないとい
う問題があった。一方、４条ねじを含む多条ねじの形態
のものでは、ねじ込み可能箇所が条数だけ存在するの
で、調整の為の回転を少なくでき、これによって１条ね
じに比べてかなりスタビング性は改善されるが、それで
もいつも差し込み位置から直ちにねじ込むことは不可能
である。また、スタビングガイドを備えた形態のもので
は、ねじの斜め差し込みによるかじりなどのトラブルは
防げても、本質的に差し込み後直ちにねじ込みを行なう
ためのものではない。However, the conventional pipe joint has the following problems to be solved. In the case of the single thread form, the insertion position is not always the screwing start position, and there is a problem that the tapered male thread must be rotated to find the screwing position. On the other hand, in the case of the form of a multi-threaded screw including a four-threaded screw, since there are only as many screwable locations as possible, the rotation for adjustment can be reduced, thereby considerably improving the stubbing property as compared with the single-threaded screw. Nevertheless, it is not always possible to immediately screw in from the insertion position. Further, in the configuration provided with the stubbing guide, troubles such as galling due to the oblique insertion of the screw can be prevented, but it is not essentially for performing the screwing immediately after the insertion.
【０００８】本発明はこのような事情に鑑みてなされた
もので、多条ねじを有するテーパ雄ねじ部をテーパ雌ね
じ部に差し込んだ位置から、そのまま迅速かつ容易にね
じ込むことが可能な管継手を提供することを目的とす
る。The present invention has been made in view of such circumstances, and provides a pipe joint which can be quickly and easily screwed from a position where a tapered male thread having a multi-threaded thread is inserted into the tapered female thread. The purpose is to do.
【０００９】[0009]
【課題を解決するための手段】前記目的に沿う請求項１
記載の管継手は、管の先端部の外周面にテーパ雄ねじ部
を形成したピンと、短管の両端部の内周面に前記テーパ
雄ねじ部に螺合するテーパ雌ねじ部を形成したボックス
とをねじ込む管継手において、多条ねじを適用し、奇数
条の場合は、（条数−１）山おきに配置された高い雄、
雌ねじ山と、該高い雄、雌ねじ山間に配置された低い
雄、雌ねじ山とからなるねじ列とし、偶数条の場合は、
高い雄、雌ねじ山と低い雄、雌ねじ山とを交互に配置し
たねじ列とするか、又は（条数−１）山おきに配置され
た高い雄、雌ねじ山と、該高い雄、雌ねじ山間に配置さ
れた低い雄、雌ねじ山とからなるねじ列とする。請求項
２記載の管継手は、請求項１記載の管継手において、前
記雄ねじ山のねじ山頂面と前記雌ねじ山のねじ山頂面
は、角ねじ又は台形ねじのように所定の幅を有し、前記
両ねじ山頂面を、管軸に平行な面に対して平行又は、ね
じ列テーパ面と反対方向に傾斜させる。請求項３記載の
管継手は、請求項１記載の管継手において、前記雄ねじ
山のねじ山頂面と前記雌ねじ山のねじ山頂面は、角ねじ
又は台形ねじのように所定の幅を有し、前記両ねじ山頂
面の一部を管軸に平行にすると共に、残りの該両ねじ山
頂面を前記管軸に平行な面に対してねじ列テーパ面と反
対方向に傾斜させる。According to the present invention, there is provided a semiconductor device comprising:
In the pipe joint described above, a pin having a tapered male thread formed on the outer peripheral surface of the distal end portion of the pipe, and a box having a tapered female thread formed on the inner peripheral surface of both ends of the short pipe to be screwed with the tapered male thread are screwed. In the pipe joint, a multi-thread is applied, and in the case of an odd number of threads, (male number-1) high males arranged at every other
Female thread, said high male, low male disposed between the female threads, and a screw row consisting of female threads, in the case of an even number of threads,
A high male and female threads and a low male and female threads are alternately arranged in a screw row, or a high number of male threads and female threads arranged at every (number of threads -1) ridges, and between the high male and female threads. It is a screw row composed of low male and female threads arranged. The pipe joint according to claim 2 is the pipe joint according to claim 1, wherein a thread crest surface of the male thread and a thread crest surface of the female thread have a predetermined width like a square screw or a trapezoidal screw, The two thread crests are inclined in a direction parallel to a plane parallel to the pipe axis or in a direction opposite to the thread row taper surface. The pipe joint according to claim 3 is the pipe joint according to claim 1, wherein a thread crest surface of the male thread and a thread crest surface of the female thread have a predetermined width like a square screw or a trapezoidal screw, A part of the two thread crests is made parallel to the pipe axis, and the remaining two thread crests are inclined with respect to a plane parallel to the pipe axis in a direction opposite to the thread row taper face.
【００１０】請求項４記載の管継手は、請求項１〜３の
いずれか１項に記載の管継手において、前記テーパ雄ね
じ部を前記テーパ雌ねじ部に差し込む際、前記雄ねじ山
のねじ山頂面に接する仮想テーパ面と前記雌ねじ山のね
じ山頂面に接する仮想テーパ面とが競り合う状態におい
て、そのまま前記テーパ雄ねじ部を鉛直方向に下げると
前記雄ねじ山のねじ山頂面が前記雌ねじ山のねじ山頂面
に競ることなく、前記雄ねじ山のスタビングフランク面
が前記雌ねじ山のスタビングフランク面に重なることが
可能な元の雄ねじ列と雌ねじ列との位置関係を再現でき
るように、ねじ切り加工時に前記テーパ雄ねじ部及び前
記テーパ雌ねじ部の円周方向に符合させる印を付けてい
る。請求項５記載の管継手は、請求項１〜４のいずれか
１項に記載の管継手において、ねじ切り加工時の前記テ
ーパ雄ねじ部及び前記テーパ雌ねじ部のそれぞれのねじ
列テーパ面の相対的直径誤差を考慮して、ねじの加工誤
差を考慮しない理想的な雄ねじ列及び雄ねじ列の差し込
み直後のねじ込みを可能とする所定範囲の適正位置関係
の内、前記テーパ雄ねじ部の雄ねじ山のねじ山頂面とス
タビングフランク面とのコーナ部の位置が常に適正範囲
の中央に来るようにしている。請求項６記載の管継手
は、請求項５記載の管継手において、理想状態におい
て、前記適正範囲が前記ねじの加工誤差より大きい。請
求項７記載の管継手は、請求項１〜６のいずれか１項に
記載の管継手において、前記テーパ雌ねじ部の管端部に
該テーパ雌ねじ部に続くスタビングガイドを備えてい
る。According to a fourth aspect of the present invention, in the pipe joint according to any one of the first to third aspects, when the tapered male screw portion is inserted into the tapered female screw portion, the male screw thread has a thread crest on a top surface thereof. In a state where the imaginary tapered surface in contact and the imaginary tapered surface in contact with the thread crest of the female thread compete with each other, when the tapered male thread portion is lowered vertically as it is, the thread crest of the male thread is on the thread crest of the female thread. Without competing, the tapered male screw is formed at the time of thread cutting so that the stubbing flank surface of the male screw thread can reproduce the original positional relationship between the male screw row and the female screw row that can overlap the stubbing flank face of the female screw thread. Marks are made to match in the circumferential direction of the portion and the tapered female screw portion. The pipe joint according to claim 5, wherein in the pipe joint according to any one of claims 1 to 4, a relative diameter of a threaded taper surface of each of the tapered male thread portion and the tapered female thread portion during thread cutting. In consideration of an error, an ideal male thread row without considering a machining error of the screw and a proper positional relationship within a predetermined range that enables the screwing immediately after the insertion of the male thread row, the thread crest surface of the male thread of the tapered male thread portion. The corner portion between the stub and the stubbing flank is always located at the center of the proper range. In the pipe joint according to claim 6, in the pipe joint according to claim 5, in an ideal state, the appropriate range is larger than a processing error of the screw. According to a seventh aspect of the present invention, there is provided the pipe joint according to any one of the first to sixth aspects, further comprising a stubbing guide at a pipe end of the tapered female thread portion following the tapered female thread portion.
【００１１】本発明は、以下に説明する考え方に基づい
てなされたものである。テーパ雄ねじ部をテーパ雌ねじ
部に真っ直ぐ差し込んだ時の態様には以下の３通りの場
合がある。第１は、雄、雌ねじ山同士が競ってしまう
時、第２は、雄、雌ねじ山が部分的に競ってしまう時、
第３は、テーパ雄ねじ部の雄ねじ山のねじ山頂面がテー
パ雌ねじ部の雌ねじ山の谷部に重なり引き続きテーパ雄
ねじ部の雄ねじ山の側面（スタビングフランク面）が雌
ねじ山の側面（スタビングフランク面）に着地するとき
である。本発明が目的とする、差し込んだ後直ぐにねじ
込みを可能にするためには、テーパ雄ねじ部をテーパ雌
ねじ部に差し込んだ後、常に前記第３の状態になるよう
に雄、雌ねじ山の形状やねじ切り加工方法を工夫するこ
とが必要となる。本発明では、この第３の状態を常に再
現させるために、次の４つの要素技術を採用している。The present invention has been made based on the following concept. There are the following three cases when the tapered male screw portion is inserted straight into the tapered female screw portion. First, when male and female threads compete for each other, second, when male and female threads partially compete,
Third, the top surface of the external thread of the tapered external thread portion overlaps the valley portion of the internal thread of the tapered internal thread portion, and the side surface (stubbing flank surface) of the external thread portion of the tapered external thread portion continues to the side surface (stubbing flank) of the internal thread. It is time to land on the side. In order to enable the screwing immediately after the insertion, the shape of the male and female threads or the thread cutting so that the tapered male thread is always in the third state after the tapered male thread is inserted into the tapered female thread is aimed at by the present invention. It is necessary to devise a processing method. The present invention employs the following four element technologies in order to always reproduce the third state.
【００１２】第１の要素技術は、図２に示すように、テ
ーパ雄ねじ部１１とテーパ雌ねじ部１２の軸方向のねじ
山の相対位置が常に第３の状態になるように、ねじ切り
加工時にテーパ雄ねじ部１１の先端２０からの雄ねじ山
１３のねじ山頂面１４の差し込み側のスタビングフラン
ク面１５のコーナの座標（ｒ、Ｚm ）を予め決定してお
き、それが通過するパイプ１６（又は管と呼ぶ）の円周
方向位置に印Ｓ1 （図示せず）を付け、同時に、図２に
示すように、雄ねじ山１３のスタビングフランク面１５
のコーナが填まり込みを開始する雌ねじ山１７の谷部１
８が座標（ｒ、Ｚf ）になるようにパイプ１９（又は短
管と呼ぶ）のテーパ雌ねじ部１２の先端２０ａの円周方
向にも印Ｓ2 （図示せず）を付け、差し込み時にそれら
の印Ｓ1、Ｓ2 同士が重なるようにテーパ雄、雌ねじ部
１１、１２の円周方向位置を決め、管継手１０のねじ込
み作業を行なう。第２の要素技術は、１リード内の多条
ねじ山の一部を他のねじ山の高さより低くすることによ
り、スタビング時、雄、雌ねじ山同士が競り合う確率を
小さくすることである。これは、ねじ山の低い部分を実
質的には、１条ねじの谷部とみなすことに等しい。従っ
て、２条ねじの場合は、テーパ雄ねじ部の雄ねじ山のね
じ山頂面の幅の３倍の谷部の幅があることになり、スタ
ビング時、雄ねじ山はテーパ雌ねじ部の谷部に容易に収
まることになる。As shown in FIG. 2, the first elemental technology is such that the tapered male screw portion 11 and the tapered female screw portion 12 are always tapered at the time of thread cutting so that the relative positions of the axial threads are always in the third state. The coordinates (r, Z m ) of the corner of the stubbing flank surface 15 on the insertion side of the thread crest surface 14 of the external thread 13 from the distal end 20 of the external thread portion 11 are determined in advance, and the pipe 16 (or the pipe) through which it passes is determined. A mark S 1 (not shown) is provided at the circumferential position of the tubing (referred to as a tube), and at the same time, as shown in FIG.
Valley 1 of female thread 17 where corner of thread starts filling
A mark S 2 (not shown) is also provided in the circumferential direction of the tip 20a of the tapered female screw portion 12 of the pipe 19 (or a short pipe) so that 8 becomes the coordinates (r, Z f ). The positions of the tapered male and female threads 11 and 12 in the circumferential direction are determined so that the marks S 1 and S 2 overlap each other, and the pipe joint 10 is screwed. The second elemental technology is to reduce the probability of male and female threads competing during stubbing by making some of the multi-threaded threads in one lead lower than the other threads. This is equivalent to considering the lower part of the thread substantially as the root of a single thread. Therefore, in the case of a double-start thread, there is a valley width that is three times the width of the thread crest of the male thread of the tapered male thread, and the male thread easily fits in the valley of the tapered female thread during stubbing. Will fit.
【００１３】第３の要素技術は、第２の要素技術におけ
る高い雄、雌ねじ山同士の競り合いをも回避しようとす
る考えに基づくもので、高いねじ山頂面をねじ列テーパ
面と管軸に対し反対側に傾斜させることにより、雄、雌
ねじ山同士が面で接するのを点で接するようにしてい
る。図２に示すように、テーパ雄、雌ねじ部１１、１２
の雄、雌ねじ山１３、１７のねじ山頂面１４、２２を管
軸Ｃに平行な面Ｄ（図２中破線）より僅かに雄、雌ねじ
列の仮想テーパ面Ｔ（図２中２点鎖線）と逆方向のテー
パ面Ｅ（図２中実線）とすることである。第４の要素技
術は、図２に示すように、ねじの加工公差を考慮して、
理屈の上でテーパ雄ねじ部１１がテーパ雌ねじ部１２に
差し込み状態からそのままねじ込める軸方向範囲が、ね
じのスタンドオフ公差（又は相対的直径誤差とも呼び、
テーパねじの直径公差を長さ方向に換算した値であっ
て、ＡＰＩバットレスねじ継手の場合、１／２ピッチ）
より大きくなるようにする。[0013] The third element technology is based on the idea of avoiding competition between high male and female threads in the second element technology. By inclining to the opposite side, the male and female threads are in contact at the point where they come into contact at the surface. As shown in FIG. 2, the tapered male and female threads 11, 12
The thread crests 14 and 22 of the male and female threads 13 and 17 are slightly tapered from a plane D (dashed line in FIG. 2) parallel to the pipe axis C (imaginary tapered surface T in FIG. 2). And a tapered surface E (solid line in FIG. 2) in the opposite direction. As shown in FIG. 2, the fourth element technology takes into account the thread processing tolerance,
Theoretically, the axial range in which the tapered male screw portion 11 can be screwed into the tapered female screw portion 12 from the inserted state is the stand-off tolerance of the screw (or also referred to as a relative diameter error,
This is a value obtained by converting the diameter tolerance of the taper thread in the length direction, and in the case of an API buttress threaded joint, 1/2 pitch.)
Try to be bigger.
【００１４】第２、第３の要素技術が満足されていれ
ば、理屈の上ではテーパ雄ねじ部を円周方向のどの位置
で差し込んでも、そのままねじ込みが可能であるが、テ
ーパ雄ねじ部の雄ねじ山のスタビングフランク面をテー
パ雌ねじ部の雌ねじ山のスタビングフランク面に安定し
て着地させるには、ねじのスタンドオフ公差が差し込み
後直ぐにねじ込める許容範囲の中心に来るようにし、尚
かつスタンドオフ公差の小さい、精度良いねじ加工を行
なうようにするのが好ましい。本発明は、第２、第３の
要素技術だけで、３６０°テーパ雌ねじ部１２のどの位
置にテーパ雄ねじ部１１を差し込んでも、そのままねじ
込むことを可能とするが、実際にはねじの公差、ねじ込
み時の僅かなテーパ雄ねじ部１１とテーパ雌ねじ部１２
のそれぞれの軸の傾きも考慮して、安定してこのスタビ
ング性を確保できるように、第１の要素技術に示すねじ
切り加工時の差し込み位置を指定する印Ｓ1 、Ｓ2 及び
第４の要素技術におけるねじのスタンドオフ公差を考慮
した最適差し込み位置の考え方をも考慮したものであ
り、各要素技術を単独もしくは、組み合わせて適用する
ことにより、効果的なスタビング性、迅速締め込み性、
継手強度低下の抑制を同時に満足させることができる。If the second and third elemental technologies are satisfied, it is theoretically possible to insert the tapered male screw portion at any position in the circumferential direction without any change. In order to stably land the stubbing flank surface of the thread on the stubbing flank surface of the female thread of the tapered female thread, make sure that the standoff tolerance of the screw is in the center of the allowable range for screwing immediately after insertion, and It is preferable to perform screw processing with a small tolerance and high accuracy. According to the present invention, it is possible to screw the tapered male screw portion 11 into any position of the 360 ° tapered female screw portion 12 as it is by using only the second and third element technologies. Slightly tapered male thread 11 and tapered female thread 12
The marks S 1 , S 2 and the fourth element for designating the insertion position at the time of thread cutting shown in the first element technology so that the stubbing property can be stably secured in consideration of the inclination of each axis. It also considers the concept of the optimal insertion position in consideration of the stand-off tolerance of the screw in the technology.By applying each element technology alone or in combination, effective stubbing, quick tightening,
The suppression of the joint strength reduction can be satisfied at the same time.
【００１５】本発明は、雄、雌ねじ部を２段に分けた多
条ねじ継手でも、またねじ列のどこかにテーパねじ部を
具備する多条ねじ継手でも、それら全てに適用できるこ
とは言うまでもない。（図６（Ｃ）及び（Ｄ）参照）。
さらに、既述のスタビングガイドの考えと組み合わせる
ことにより、斜めねじ込み時に予想されるねじのかじり
（クロススレッド）を防止し、テーパ雄ねじ部のテーパ
雌ねじ部へのスタビングからねじ込みまでの一連の作業
を省力化することも可能としている。It is needless to say that the present invention can be applied to a multi-threaded screw joint in which the male and female thread portions are divided into two stages, and a multi-threaded screw joint having a tapered thread portion somewhere in the thread row. . (See FIGS. 6C and 6D).
Furthermore, by combining with the idea of the stubbing guide described above, it is possible to prevent the anti-seizure (cross-thread) of the screw that is expected at the time of the oblique screwing, and to perform a series of operations from stubbing to the tapered female screw part of the tapered male screw part. Labor saving is also possible.
【００１６】[0016]
【発明の実施の形態】続いて、添付した図面を参照しつ
つ、本発明を具体化した実施の形態につき説明し、本発
明の理解に供する。ここに、図１は本発明の一実施の形
態に係る管継手が適用されるテーパねじ継手のスタビン
グフランク面の重なりが最大となる差し込み位置状態を
説明する断面図、図２は同テーパねじ継手の差し込み適
正範囲の状態を説明する断面図、図３は同テーパねじ継
手の嵌合状態を説明する断面図、図４は同テーパねじ継
手が３条の場合のねじ形状の断面図、図５は同テーパね
じ継手が４条の場合のねじ形状の断面図、図６は本発明
の一実施の形態に係る管継手の変形例の断面図、図７は
同管継手の実施例の嵌合状態での寸法図、図８は同詳細
寸法図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a cross-sectional view for explaining the insertion position state where the overlap of the stub flank surfaces of the tapered threaded joint to which the pipe joint according to one embodiment of the present invention is applied is maximized, and FIG. FIG. 3 is a cross-sectional view for explaining a fitting state of the joint in a proper insertion range, FIG. 3 is a cross-sectional view for explaining a fitting state of the tapered threaded joint, and FIG. 5 is a cross-sectional view of the thread shape when the tapered threaded joint has four threads, FIG. 6 is a cross-sectional view of a modified example of the pipe joint according to an embodiment of the present invention, and FIG. 7 is a fitting of the example of the pipe joint. FIG. 8 is a detailed dimensional diagram of the same state.
【００１７】図６に示す本発明の一実施の形態に係る管
継手が適用されるテーパねじ継手の形状において、
（Ａ）は締結ねじのみを備えた管継手、（Ｂ）はねじ嵌
合部の先端部に金属シール部を具備する管継手、（Ｃ）
は（Ａ）又は（Ｂ）の一様テーパねじ部を２段に分けた
管継手、（Ｄ）は（Ａ）又は（Ｂ）の一様テーパねじ部
の一部に平行ねじ部を代替した管継手である。雄、雌ね
じテーパ部の相対的太さを一定に管理するためには、テ
ーパ雄ねじ部ならば、その先端からある軸方向位置のね
じ有効径を一定に加工し、一方テーパ雌ねじ部ならば、
継手入口からのある軸方向深さのねじ有効径を一定に加
工する。In the shape of a tapered threaded joint to which the pipe joint according to one embodiment of the present invention shown in FIG. 6 is applied,
(A) is a pipe joint having only a fastening screw, (B) is a pipe joint having a metal seal portion at a tip end portion of a screw fitting portion, (C)
Is a pipe joint in which the uniform tapered thread portion of (A) or (B) is divided into two stages, and (D) is a parallel threaded portion which is substituted for a part of the uniform tapered thread portion of (A) or (B). It is a pipe joint. In order to maintain the relative thickness of the male and female thread taper parts constant, in the case of a tapered male thread part, the screw effective diameter at a certain axial position from the tip is processed to be constant, while in the case of a tapered female thread part,
The effective diameter of the screw at a certain axial depth from the joint inlet is machined.
【００１８】図１は、一山毎にねじ山高さを変えた、ね
じリードＬ（図２を参照）、ピッチｐ（Ｌ／２）の２条
ねじからなるテーパ雄、雌ねじ部１１、１２において、
雄ねじ山１３、１３ａ、雌ねじ山１７、１７ａが、それ
ぞれのねじ山頂面１４、２２の点と仮想テーパＴが接す
る状態で、尚かつ雄ねじ山１３のスタビングフランク面
１５とねじ山頂面１４とのコーナ部２４が、テーパ雌ね
じ部１２の雌ねじ山１７のスタビングフランク面２５と
ねじ山頂面２２とのコーナ部２７に接した状態、即ち差
し込み位置の状態を示している。なお、雄ねじ山１３ａ
及び雌ねじ山１７ａにおいて、雄ねじ山１３、雌ねじ山
１７の各要素に対応するものには、図に添字ａを付けて
説明している。この状態から、テーパ雄ねじ部１１の雄
ねじ山１３のコーナ部２４がテーパ雌ねじ部１２の雌ね
じ山１７のコーナ部２７をすり抜ければ、コーナ部２４
は管継手１０の管軸Ｃに平行な面Ｄ（破線で示す）に沿
って下方に落下し、一つ下の雌ねじ山１７ａを僅かにか
わして、その下の雌ねじ山１７のスタビングフランク面
２５の点２８に着地する。つまり、高さの低い雄ねじ山
１３ａ、雌ねじ山１７ａを、高さの高い雄ねじ山１３
が、高さの高い雌ねじ山１７に着地するのに妨げとなら
ない程度に低くしておけばよい。こうして首尾よく、高
さの高い雄ねじ山１３のスタビングフランク面１５が、
高さの高い雌ねじ山１７のスタビングフランク面２５に
重なれば、この時の雄ねじ山１３と雌ねじ山１７の重な
りｗは最大となる。FIG. 1 shows a threaded lead L (see FIG. 2) having a different thread height for each thread, and a tapered male and female threaded portions 11 and 12 composed of a double thread having a pitch p (L / 2). ,
With the external threads 13, 13a and the internal threads 17, 17a being in contact with the points of the respective thread crests 14, 22 and the virtual taper T, the stabbing flank 15 and the thread crest 14 of the male thread 13 are still in contact. The state where the corner portion 24 is in contact with the corner portion 27 between the stubbing flank surface 25 of the female thread 17 of the tapered female thread portion 12 and the thread crest surface 22, that is, the insertion position is shown. The external thread 13a
In the female thread 17a, those corresponding to the elements of the male thread 13 and the female thread 17 are described with the suffix a added to the figure. From this state, when the corner portion 24 of the male thread 13 of the tapered male screw portion 11 slips through the corner portion 27 of the female thread 17 of the tapered female screw portion 12, the corner portion 24
Drops downward along a plane D (shown by a broken line) parallel to the pipe axis C of the pipe joint 10, slightly deflects the immediately lower internal thread 17a, and stabs the flank surface of the lower internal thread 17 thereunder. Landing at point 28 of 25. That is, the male thread 13a having a lower height and the female thread 17a are replaced with the male thread 13 having a higher height.
However, it may be set low enough not to hinder landing on the tall internal thread 17. Thus, the stubbing flank surface 15 of the tall male thread 13 has been successfully
When overlapping the stubbing flank surface 25 of the tall internal thread 17, the overlap w of the external thread 13 and the internal thread 17 at this time becomes the maximum.
【００１９】このように雄ねじ山１３のスタビングフラ
ンク面１５が旨く雌ねじ山１７のスタビングフランク面
２５に着地できるのは、図から明らかなように、一つお
きに低いねじ山を配置していることに加え、角ねじ又は
台形ねじのように所定の幅を有する雄ねじ山１３のねじ
山頂面１４と雌ねじ山１７のねじ山頂面２２とが、差し
込み時に競り合うことがないように、管軸Ｃに平行な面
Ｄに対してねじテーパ角αと反対側にスタビング逃げ角
βを設けて傾斜しているからである。理想的にはこれら
ねじ山頂面１４、２２は管軸Ｃに平行（図１の破線の補
足線）でも競り合うことはないが、テーパ雄ねじ部１１
の差し込み時には僅かな傾きがあるので、実際には雄、
雌ねじ山１３、１７同士が競り合うこともあり得る。ス
タビング逃げ角βは大きい方がねじ込み容易性には優れ
るが、反面大き過ぎると継手引張時に荷重を受け持つロ
ードフランク面２３、２３ａの高さｈが低くなり、テー
パ雄ねじ部１１がテーパ雌ねじ部１２から抜け易くなる
問題があるので、必要以上に大きくすることは適当でな
い。特に、雄ねじ山１３、１３ａ、雌ねじ山１７、１７
ａの高さを低くすること自体でねじ山高さを犠牲にして
いるので、ねじ山頂面１４、２２の傾斜角はこの点も考
慮して、必要ねじ高さを確保するように決定する。な
お、図１及び図２中符号１６はパイプ、１８は谷部、１
９はパイプ、２６は雌ねじ山１７のロードフランク面を
示す。The reason why the stubbing flank surface 15 of the male thread 13 can be successfully landed on the stubbing flank surface 25 of the female thread 17 is, as is apparent from the drawing, that every other lower thread is arranged. In addition to the above, the pipe axis C is set so that the thread crest surface 14 of the male thread 13 and the thread crest surface 22 of the female thread 17 having a predetermined width such as a square screw or a trapezoidal screw do not compete with each other at the time of insertion. This is because the stubbing clearance angle β is provided on the side opposite to the screw taper angle α with respect to the plane D parallel to Ideally, these thread crests 14 and 22 do not compete with each other even if they are parallel to the pipe axis C (the dashed supplementary line in FIG. 1).
There is a slight inclination when inserting the, so actually male,
The female threads 13, 17 may compete with each other. The larger the stubbing relief angle β is, the better the ease of screwing is. However, if the stubbing clearance angle β is too large, the height h of the load flank surfaces 23 and 23a which bear the load during the joint pulling becomes low, and the tapered male screw portion 11 is separated from the tapered female screw portion 12. It is not appropriate to make it unnecessarily large because there is a problem that it easily comes off. In particular, external threads 13, 13a, internal threads 17, 17
Since the thread height is sacrificed by lowering the height a, the inclination angles of the thread crests 14 and 22 are determined in consideration of this point so as to secure the required screw height. 1 and 2, reference numeral 16 denotes a pipe, 18 denotes a valley, 1
Reference numeral 9 denotes a pipe, and 26 denotes a load flank surface of the female thread 17.
【００２０】図２に示す管継手１０は、雄ねじ山１３の
コーナ部２４が仮想テーパ面Ｔに接して止まる位置が、
図１の場合に比べて１ピッチＰだけねじ込み方向に進
み、図のねじリードＬの中央に位置する状態を示す。テ
ーパ雄ねじ部１１の雄ねじ山１３のコーナ部２４をねじ
リードＬの中央に設定している理由は、ねじのスタンド
オフ公差及び僅かでも傾きを伴ったスタビング作業であ
っても、雄ねじ山１３のスタビングフランク面１５を安
定してテーパ雌ねじ部１２の雌ねじ山１７のスタビング
フランク面２５に着地させるためである。ねじのスタン
ドオフ公差による雄ねじ山１３の雌ねじ山１７に対する
相対的ずれの範囲は、スタンドオフ公差をそれぞれｓと
すれば、図２に示すｓの範囲となる。もしコーナ部２４
がｓの範囲の上方端に偏れば、雌ねじ山１７のコーナ部
２７をすり抜け難い方向となり、一方、反対にｓの範囲
の下方端に偏れば、雌ねじ山１７のコーナ部２７までの
距離が近くなり、着地時の両方のスタビングフランク面
１５、２５の重なりが狭くなるので、安定がよくない方
向となる。In the pipe joint 10 shown in FIG. 2, the position where the corner portion 24 of the external thread 13 comes into contact with the virtual tapered surface T and stops is as follows.
1 shows a state in which it advances in the screwing direction by one pitch P compared to the case of FIG. 1 and is located at the center of the screw lead L in the figure. The reason why the corner portion 24 of the external thread 13 of the tapered external thread portion 11 is set at the center of the screw lead L is that even if the stubbing operation involves a stand-off tolerance of the screw and a slight inclination, the start position of the external thread 13 is reduced. This is for stably landing the bing flank surface 15 on the stub flank surface 25 of the female thread 17 of the tapered female thread portion 12. The range of the relative displacement of the male thread 13 with respect to the female thread 17 due to the stand-off tolerance of the screw is the range of s shown in FIG. If corner 24
Is shifted to the upper end of the range of s, it is difficult to slip through the corner 27 of the female thread 17, while if it is shifted to the lower end of the range of s, the distance to the corner 27 of the female thread 17 is And the overlap between the two stubbing flank surfaces 15 and 25 at the time of landing is narrowed, so that the direction becomes less stable.
【００２１】従って、ねじ切り時の刃物パス計算におい
ては、雄ねじ山１３と雌ねじ山１７の仮想テーパ面Ｔが
接した状態において、図２のコーナ部２４（図中○）が
雌ねじ山１７のねじリードＬの中央に位置するようにパ
スデザインする必要があり、ねじのスタンドオフ公差が
小さく、精度の良いテーパねじ加工が必要となる。○を
刃物の基準位置と考えれば、それらが雄ねじ切りパスで
は、（ｒ、Ｚm ）を通過するように、一方、雌ねじ切り
パスでは、（ｒ、Ｚf ）を通過するように、ねじ切り開
始時の雄ねじ切り刃物、雌ねじ切り刃物とパイプ１６、
１９それぞれとの関係を設定し、その時の刃物運動面が
それぞれパイプ１６、１９と交わるパイプ１６、１９の
周方向位置に印Ｓ1 、Ｓ2 を付けておく。こうすること
で、印Ｓ1 、Ｓ2 の付いたテーパ雄ねじ部１１とテーパ
雌ねじ部１２をその印Ｓ1 、Ｓ2の位置を円周方向に一
致させて差し込めば、必ず図２に示す位置関係、即ち
雄、雌ねじ山１３、１７のねじ山頂面１４、２２が競る
ことなく、雄ねじ山１３のスタビングフランク面１５が
雌ねじ山１７のスタビングフランク面２５に重なること
が可能な元の雄ねじ列と雌ねじ列との位置関係を再現で
き、円滑なテーパ雄ねじ部１１の差し込み及びそれに続
くねじ込みが可能となる。Therefore, in the blade path calculation at the time of thread cutting, in the state where the male thread 13 and the virtual taper surface T of the female thread 17 are in contact with each other, the corner portion 24 in FIG. It is necessary to design the path so that it is located at the center of L, and the stand-off tolerance of the screw is small, and it is necessary to process the taper screw with high accuracy. Assuming that ○ is the reference position of the blade, start thread cutting so that they pass through (r, Z m ) in a male thread cutting pass, while passing through (r, Z f ) in a female thread cutting pass. Male thread cutting knife, female thread cutting knife and pipe 16,
A relationship with each of the pipes 19 is set, and marks S 1 and S 2 are marked at circumferential positions of the pipes 16 and 19 at which the blade motion surface intersects the pipes 16 and 19 respectively. In this way, if plugged by matching the mark S 1, S 2 of the tapered male thread portion 11 with a tapered female screw portion 12 of the position of the mark S 1, S 2 in the circumferential direction, always the position shown in FIG. 2 The original male screw that allows the stubbing flank surface 15 of the male thread 13 to overlap the stubbing flank surface 25 of the female thread 17 without the thread crest surfaces 14, 22 of the male and female threads 13, 17 competing. The positional relationship between the row and the female thread row can be reproduced, and the smooth insertion of the tapered male screw portion 11 and subsequent screwing can be performed.
【００２２】図３は管継手１０のテーパ雄ねじ部１１と
テーパ雌ねじ部１２とが締め付けを終了した状態、即ち
嵌合状態を示している。本実施の形態に係る管継手１０
の場合のテーパねじ形状の特徴は、スタビングフランク
面１５、１５ａ、２５、２５ａに比べロードフランク面
２３、２３ａ、、２６、２６ａの高さが低くなることで
ある。このことは先に述べたテーパ雄ねじ部１１の抜け
を惹起する可能性があるので、その抵抗を高めるために
次の２つの方法を採用している。第１は、図３に示すよ
うに、ロードフランク面２３ａ、２６ａを管軸Ｃに対す
る垂直面Ｖs より抜け難い方に角度γだけ傾けることで
ある。第２は雄、雌ねじ山１３、１７のねじ山頂面１
４、２２の全面をスタビング逃げ角βとするのでなく、
スタビングフランク面１５、１５ａ、２５、２５ａに近
い側のみスタビング逃げ角βとし、残りのロードフラン
ク面２３、２３ａ、２６、２６ａに近い側を平行とする
か、逆にスタビングフランク面１５、１５ａ、２５、２
５ａに近い側のみ平行とし、残りのロードフランク面２
３、２３ａ、２６、２６ａ側にスタビング逃げ角度βを
適用することにより、少しでもロードフランク面２３、
２３ａ、２６、２６ａの高さｈが低くなるのを回避して
いる。なお、図３中の破線は、ねじ山頂面１４、２２を
管軸Ｃに平行にした場合の補足線で、ロードフランク面
２３、２３ａ、２６、２６ａの嵌合高さの改善代を示し
ている。FIG. 3 shows a state in which the tapered male thread 11 and the tapered female thread 12 of the pipe joint 10 have been tightened, that is, a fitted state. Pipe fitting 10 according to the present embodiment
The feature of the tapered screw shape in the case of (1) is that the height of the load flank surfaces 23, 23a, 26, 26a is lower than that of the stubbing flank surfaces 15, 15a, 25, 25a. Since this may cause the tapered male screw portion 11 to come off as described above, the following two methods are employed to increase the resistance. First, as shown in FIG. 3, it is that the tilting load flanks 23a, 26a to the person who hardly dropout from the vertical plane V s for the pipe axis C by an angle gamma. Second is the thread crest surface 1 of the male and female threads 13 and 17
Instead of making the entire surface of 4, 22 a stubbing clearance angle β,
The stubbing flank angle β is set only on the side near the stubbing flank surfaces 15, 15a, 25, and 25a, and the remaining sides near the load flank surfaces 23, 23a, 26, and 26a are parallel, or conversely, the stubbing flank surface 15, 15a, 25, 2
Only the side close to 5a is parallel, and the remaining road flank 2
By applying the stubbing clearance angle β to the sides 3, 3, a, 26, and 26a, the road flank surface 23,
The height h of 23a, 26, 26a is prevented from becoming low. The dashed line in FIG. 3 is a supplementary line when the thread crests 14 and 22 are parallel to the pipe axis C, and indicates a margin of improvement in the fitting height of the load flank surfaces 23, 23a, 26 and 26a. I have.
【００２３】以上、２条ねじの例を詳しく述べてきた
が、締め込みは条数が増す程速くなる。そこで、３条ね
じ、４条ねじについても、ねじ山の高さの高低の付け方
について触れておく。図４（Ａ）は３条ねじで、高いね
じ山を２つおき、即ち（条数−１）山おきに配置した場
合を示す。雄ねじ山１３ｃは、雌ねじ山１７ｃをすり抜
けた状態で、雌ねじ山１７ｄに着地が見通せる位置にあ
る。スタビングフランク面の重なりも広く取れ、ねじリ
ードＬ内の広い範囲で安定して雌ねじ山１７ｄに着地可
能である。しかし、嵌合した状態（二点鎖線）を想像す
ると、嵌合高さが図示のように狭くなる欠点がを併せ持
つことになる。なお、図４（Ａ）中符号１３ｄは高さの
高い雄ねじ山を示す。Although the example of the double thread has been described in detail, the tightening becomes faster as the number of threads increases. Therefore, how to attach the three-threaded screw and the four-threaded screw to the height of the thread will be described. FIG. 4A shows a case where three high threads are arranged every two high threads, that is, every (number of threads-1) threads. The male thread 13c is at a position where the landing can be seen through the female thread 17d in a state where the male thread 13c has slipped through the female thread 17c. The overlap of the stubbing flank can be widened, and it is possible to stably land on the female thread 17d in a wide range within the screw lead L. However, when the fitting state (two-dot chain line) is imagined, the fitting height has a disadvantage that the fitting height becomes narrow as shown in the figure. Note that reference numeral 13d in FIG. 4A indicates a high male thread.
【００２４】図４（Ｂ）は、この欠点を解消するため、
スタビング位置と着地幅を犠牲にして、高さの高い雌ね
じ山１７ｅ、１７ｆの中間の雌ねじ山１７ｇ、１７ｈの
高さを高めにしたものである。雄ねじ山１３ｅ、１３ｆ
はそれぞれ雌ねじ山１７ｈ、１７ｆに着地可能である。
なお、図４（Ｂ）中符号１３ｇ、１３ｈも雄ねじ山を示
す。図５（Ａ）は４条ねじで、高いねじ山を１つおきに
配置した場合を示す。スタビング性（差し込みからねじ
込みまでの作業性）及びねじ嵌合状況を２条ねじと同様
とし、ねじ込み速さを２条ねじの倍にできる。雄ねじ山
１３ｉ、１３ｋはそれぞれ雌ねじ山１７ｋ、１７ｎに着
地可能である。図５（Ｂ）は４条ねじで、高いねじ山を
３つおき、即ち（条数−１）山おきに配置した場合を示
す。雄ねじ山１３ｐは雌ねじ山１７ｐをすり抜けた状態
で、雌ねじ山１７ｔに着地が見通せる位置にある。図４
（Ａ）と同様、スタビング性は良好であるが、継手効率
を犠牲にしている。ねじ切り工程で雄ねじ山と雌ねじ山
のねじ列相対位置が、制御できるのであれば、図４
（Ｂ）及び図５（Ａ）の場合でも、スタビング性には十
分余裕があるので、図４（Ａ）及び図５（Ｂ）タイプの
ねじ山を高低配列したものより、図４（Ｂ）及び図５
（Ａ）の方が継手効率も勘案するのであれば、適当であ
る。FIG. 4 (B) shows that this disadvantage is solved.
At the expense of the stubbing position and the landing width, the height of the female threads 17g and 17h between the high female threads 17e and 17f is increased. Male thread 13e, 13f
Can land on the female threads 17h and 17f, respectively.
Note that reference numerals 13g and 13h in FIG. 4B also indicate external threads. FIG. 5 (A) shows a case where four high threads are arranged every other high thread. The stubbing property (operability from insertion to screwing) and the screw fitting condition are the same as those of the double thread, and the screwing speed can be doubled as compared with the double thread. The external threads 13i and 13k can land on the internal threads 17k and 17n, respectively. FIG. 5B shows a case in which four high threads are arranged at every three high threads, that is, at every (number of threads-1) threads. The external thread 13p is located at a position where the landing can be seen through the internal thread 17t in a state where the external thread 13p passes through the internal thread 17p. FIG.
As in (A), the stubbing properties are good, but the joint efficiency is sacrificed. If the relative positions of the screw rows of the external thread and the internal thread can be controlled in the thread cutting process, FIG.
4B and FIG. 5A, the stubbing has a sufficient margin, so that FIG. And FIG.
(A) is more appropriate if the joint efficiency is also taken into account.
【００２５】また、このように条数を増やしても、スタ
ビング時、雄ねじ山の通り抜けをよくするために、高い
ねじ山のねじ山頂面にねじ列テーパ面と反対の傾斜を付
けたり、丁度いい位置に填まり込むようにねじ加工時、
パイプに印を付けておくなどの技術的考え方は、上述の
２条ねじの場合と同様である。Even if the number of threads is increased as described above, in order to improve the passage of the external thread during stubbing, the thread crest of a high thread may be inclined opposite to the thread row taper surface, or may be just right. When threading to fit into the position,
The technical concept, such as marking the pipe, is the same as in the case of the above-mentioned double thread.
【００２６】[0026]
【実施例】続いて、前記実施の形態に係る管継手の実施
例について、図７及び図８（Ａ）及び（Ｂ）を参照しな
がら説明する。図７及び図８は、７インチのＡＰＩバッ
トレスねじ継手を原形とし、前記実施の形態に係る管継
手を基にスタビング性及び迅速締め込み性を改良した継
手である。なお、図７は管継手の嵌合状態での取り合い
寸法を示す断面図である。ＡＰＩバットレスねじ継手と
異なるねじ諸元は、２条ねじとしていること、ピン、ボ
ックスそれぞれの雄、雌ねじ山のねじ山頂面が管軸Ｃに
対してねじ列テーパ面ＰＴ、ＢＴと反対側に３°傾斜
し、ロードフランク面が管軸Ｃに垂直な面に対して、Ａ
ＰＩバットレスねじ継手の場合とは反対方向に３°傾斜
し、さらにスタビングフランク面を３０°傾斜している
点である。EXAMPLE Next, an example of the pipe joint according to the above embodiment will be described with reference to FIGS. 7 and 8A and 8B. FIGS. 7 and 8 show a joint having a 7-inch API buttress threaded joint as an original and improved stubbing and quick tightening based on the pipe joint according to the embodiment. FIG. 7 is a cross-sectional view showing the fitting dimensions when the pipe joint is fitted. The thread specifications differing from the API buttress threaded joint are that the thread is a two-start thread, and the thread crests of the male and female threads of the pin and the box are 3 on the side opposite to the thread row taper faces PT and BT with respect to the pipe axis C. ° inclined and the load flank plane is perpendicular to the pipe axis C,
The point is that the stubbing flank is inclined by 30 ° in the direction opposite to the case of the PI buttress threaded joint, and further inclined by 30 °.
【００２７】このような要領でねじ継手加工を行い、テ
ーパ雄ねじ部をテーパ雌ねじ部に差し込んで、その状態
からそのままねじ込みが可能かどうか試した。その結
果、管軸Ｃが傾かないようにテーパ雄ねじ部をテーパ雌
ねじ部に注意深く挿入すれば、３６０°のどの位置に差
し込んでも、そのままねじ込むことが可能であることを
確認した。また、当然であるが、２条ねじとしているた
め、締め込み回転数も通常のＡＰＩバットレスねじ継手
の半分にできた。さらに、軸芯ずれをなくすために、テ
ーパ雌ねじ部の先端（又は管端部とも呼ぶ）に２００ｍ
ｍの円筒をスタビングガイドとして溶接して、同じ作業
を実施したところ、芯合わせに神経を使うことなくスタ
ビング、ねじ込みの連続作業が可能であることも確認で
きた。The threaded joint processing was performed in such a manner, a tapered male thread was inserted into the tapered female thread, and it was tested whether or not screwing was possible from that state. As a result, it was confirmed that if the tapered male screw portion is carefully inserted into the tapered female screw portion so that the pipe axis C does not tilt, it can be screwed as it is at any position in 360 °. In addition, as a matter of course, the number of rotations can be reduced to half of that of a normal API buttress threaded joint because of the double thread. Furthermore, in order to eliminate axial misalignment, the tip of the tapered female thread (or the pipe end) is 200m
When the same operation was carried out by welding a cylinder of m as a stubbing guide, it was also confirmed that continuous stubbing and screwing work was possible without using a nerve for alignment.
【００２８】[0028]
【発明の効果】請求項１〜７記載の管継手においては、
多条ねじを適用し、奇数条の場合は、（条数−１）山お
きに配置された高い雄、雌ねじ山と、高い雄、雌ねじ山
間に配置された低い雄、雌ねじ山とからなるねじ列と
し、偶数条の場合は、高い雄、雌ねじ山と低い雄、雌ね
じ山とを交互に配置したねじ列とするか、又は（条数−
１）山おきに配置された高い雄、雌ねじ山と、該高い
雄、雌ねじ山間に配置された低い雄、雌ねじ山とからな
るねじ列としているので、１ねじリード内の多条ねじの
山形状を工夫することにより、テーパ雄ねじ部の差し込
み位置からそのままねじ込むことができると共に、ねじ
込み作業を容易かつ迅速に行なうことができる。特に、
請求項２記載の管継手においては、雄ねじ山のねじ山頂
面と雌ねじ山のねじ山頂面は、角ねじ又は台形ねじのよ
うに所定の幅を有し、両ねじ山頂面を、管軸に平行な面
に対して平行又は、ねじ列テーパ面と反対方向に傾斜さ
せているので、テーパ雄ねじ部を３６０°のどの位置で
差し込んでも差し込み及びそれに続くねじ込みの連続作
業がより円滑に行なえる。請求項３記載の管継手におい
ては、雄ねじ山のねじ山頂面と雌ねじ山のねじ山頂面
は、角ねじ又は台形ねじのように所定の幅を有し、両ね
じ山頂面の一部を管軸に平行にすると共に、残りの両ね
じ山頂面を管軸に平行な面に対してねじ列テーパ面と反
対方向に傾斜させているので、ロードフランク面の高さ
を大きく保つことができ、抜け難いねじ継手形状にでき
る。According to the pipe joint according to claims 1 to 7,
A multi-threaded screw is applied. In the case of an odd-numbered thread, a screw consisting of high male and female threads arranged at every (number of threads-1) ridges and low male and female threads arranged between high male and female threads In the case of an even number of threads, a thread row in which high male and female threads and low male and female threads are alternately arranged, or (number of threads-
1) Since the thread row is composed of high male and female threads arranged at the ridges and low male and female threads arranged between the high male and female threads, the thread shape of the multi-thread in one screw lead By devising, the screw can be screwed as it is from the insertion position of the tapered male screw portion, and the screwing operation can be performed easily and quickly. Especially,
In the pipe joint according to claim 2, the thread crests of the male thread and the female thread have a predetermined width like a square thread or a trapezoidal thread, and both thread crests are parallel to the pipe axis. Parallel to the main surface or inclined in the direction opposite to the tapered surface of the screw array, the continuous operation of insertion and subsequent screwing can be performed smoothly even if the tapered male screw portion is inserted at any position of 360 °. In the pipe joint according to the third aspect, the thread crests of the male thread and the female thread have a predetermined width like a square thread or a trapezoidal thread, and a part of both thread crests is connected to the pipe shaft. And the other two thread crests are inclined in the opposite direction to the thread row taper surface with respect to the surface parallel to the pipe axis, so that the height of the load flank surface can be kept large, It is possible to make a difficult screw joint shape.
【００２９】請求項４記載の管継手においては、テーパ
雄ねじ部をテーパ雌ねじ部に差し込む際、雄ねじ山のね
じ山頂面に接する仮想テーパ面と雌ねじ山のねじ山頂面
に接する仮想テーパ面とが競り合う状態において、その
ままテーパ雄ねじ部を鉛直方向に下げると雄ねじ山のね
じ山頂面が雌ねじ山のねじ山頂面に競ることなく、雄ね
じ山のスタビングフランク面が雌ねじ山のスタビングフ
ランク面に重なることが可能な元の雄ねじ列と雌ねじ列
との位置関係を再現できるように、ねじ切り加工時にテ
ーパ雄ねじ部及びテーパ雌ねじ部の円周方向に符合させ
る印を付けているので、テーパ雄ねじ部の差し込み位置
からそのままねじ込むことができると共に、ねじ込み作
業をさらに容易かつ迅速に行なうことができる。請求項
５記載の管継手においては、ねじ切り加工時のテーパ雄
ねじ部及びテーパ雌ねじ部のそれぞれのねじ列テーパ面
の相対的直径誤差を考慮して、ねじの加工誤差を考慮し
ない理想的な雄ねじ列及び雄ねじ列の差し込み直後のね
じ込みを可能とする所定範囲の適正位置関係の内、テー
パ雄ねじ部の雄ねじ山のねじ山頂面とスタビングフラン
ク面とのコーナ部の位置が常に適正範囲の中央に来るよ
うにしているので、ねじの加工誤差に無関係にテーパ雄
ねじ部の差し込み及びそれに続くねじ込みの連続作業が
可能である。請求項６記載の管継手においては、理想状
態において、適正範囲がねじの加工誤差より大きいの
で、さらにテーパ雄ねじ部の差し込み及びそれに続くね
じ込みの連続作業が改善される。請求項７記載の管継手
においては、テーパ雌ねじ部の管端部にテーパ雌ねじ部
に続くスタビングガイドを備えているので、テーパ雄ね
じ部がスタビングガイドに案内されて、軸芯が出るた
め、差し込み及びねじ込み作業が容易に実施できる。In the pipe joint according to the fourth aspect, when the tapered male thread is inserted into the tapered female thread, the virtual tapered surface in contact with the thread crest of the external thread and the virtual taper surface in contact with the thread crest of the female thread compete with each other. In this state, if the tapered male thread portion is lowered as it is in the vertical direction, the thread crest of the male thread does not compete with the thread crest of the female thread, and the stubbing flank of the male thread may overlap the stubbing flank of the female thread. In order to reproduce the possible positional relationship between the original male thread row and female thread row, a mark is made to match in the circumferential direction of the tapered male thread part and the tapered female thread part at the time of thread cutting, so from the insertion position of the tapered male thread part The screwing operation can be performed as it is, and the screwing operation can be performed more easily and quickly. In the pipe joint according to the fifth aspect, an ideal male thread array which does not consider a machining error of a screw in consideration of a relative diameter error of a thread array taper surface of each of a taper male thread portion and a taper female thread portion during thread cutting. And, within the appropriate range of the predetermined range that allows the screwing immediately after the insertion of the male screw row, the position of the corner between the thread crest surface of the external thread of the tapered male screw portion and the stubbing flank is always at the center of the appropriate range. With this configuration, the continuous operation of inserting the tapered male screw portion and subsequent screwing can be performed regardless of the machining error of the screw. In the pipe joint according to the sixth aspect, in the ideal state, since the appropriate range is larger than the machining error of the thread, the continuous operation of the insertion of the tapered male thread and the subsequent threading is further improved. In the pipe joint according to claim 7, since a stubbing guide following the tapered female thread is provided at the pipe end of the tapered female thread, the tapered male thread is guided by the stubbing guide, and the shaft core comes out. Insertion and screwing work can be easily performed.
【図１】本発明の一実施の形態に係る管継手が適用され
るテーパねじ継手のスタビングフランク面の重なりが最
大となる差し込み位置状態を説明する断面図である。FIG. 1 is a cross-sectional view illustrating an insertion position state in which a stub flank surface of a tapered threaded joint to which a pipe joint according to an embodiment of the present invention is applied has a maximum overlap.
【図２】同テーパねじ継手の差し込み適正範囲の状態を
説明する断面図である。FIG. 2 is a cross-sectional view illustrating a state of the tapered threaded joint in a proper insertion range.
【図３】同テーパねじ継手の嵌合状態を説明する断面図
である。FIG. 3 is a cross-sectional view illustrating a fitting state of the tapered threaded joint.
【図４】同テーパねじ継手が３条の場合のねじ形状の断
面図である。FIG. 4 is a sectional view of a thread shape when the tapered threaded joint has three threads.
【図５】同テーパねじ継手が４条の場合のねじ形状の断
面図である。FIG. 5 is a sectional view of a thread shape when the tapered threaded joint has four threads.
【図６】本発明の一実施の形態に係る管継手の変形例の
断面図である。FIG. 6 is a cross-sectional view of a modified example of the pipe joint according to one embodiment of the present invention.
【図７】同管継手の実施例の嵌合状態での寸法図であ
る。FIG. 7 is a dimensional view of the pipe joint in the fitted state of the embodiment.
【図８】同詳細寸法図である。FIG. 8 is a detailed dimensional diagram of the same.
【図９】従来例に係る管用テーパ角ねじを有する管継手
のねじ込み開始の状況を説明する断面図及びその拡大図
である。9A and 9B are a cross-sectional view and a magnified view illustrating a state of starting screwing of a pipe joint having a tapered pipe thread according to a conventional example.
【図１０】ＡＰＩバットレスねじ継手のねじ形状及びこ
れを使用した管継手ののねじ込み開始の状況を説明する
断面図である。FIG. 10 is a cross-sectional view illustrating a thread shape of an API buttress threaded joint and a situation of starting threading of a pipe joint using the same.
１０ 管継手 １１ テーパ雄
ねじ部 １２ テーパ雌ねじ部 １３ 雄ねじ山 １３ａ 雄ねじ山 １３ｃ 雄ねじ
山 １３ｄ 雄ねじ山 １３ｅ 雄ねじ
山 １３ｆ 雄ねじ山 １３ｇ 雄ねじ
山 １３ｈ 雄ねじ山 １３ｉ 雄ねじ
山 １３ｊ 雄ねじ山 １３ｋ 雄ねじ
山 １３ｍ 雄ねじ山 １３ｎ 雄ねじ
山 １３ｐ 雄ねじ山 １３ｑ 雄ねじ
山 １３ｒ 雄ねじ山 １３ｓ 雄ねじ
山 １３ｔ 雄ねじ山 １４ ねじ山頂
面 １４ａ ねじ山頂面 １５ スタビン
グフランク面 １５ａ スタビングフランク面 １６ パイプ １７ 雌ねじ山 １７ａ 雌ねじ
山 １７ｃ 雌ねじ山 １７ｄ 雌ねじ
山 １７ｅ 雌ねじ山 １７ｆ 雌ねじ
山 １７ｇ 雌ねじ山 １７ｈ 雌ねじ
山 １７ｉ 雌ねじ山 １７ｊ 雌ねじ
山 １７ｋ 雌ねじ山 １７ｍ 雌ねじ
山 １７ｎ 雌ねじ山 １７ｐ 雌ねじ
山 １７ｑ 雌ねじ山 １７ｒ 雌ねじ
山 １７ｓ 雌ねじ山 １７ｔ 雌ねじ
山 １８ 谷部 １８ａ 谷部 １９ パイプ ２０ 先端 ２０ａ 先端 ２２ ねじ山頂
面 ２２ａ ねじ山頂面 ２３ ロードフ
ランク面 ２３ａ ロードフランク面 ２４ コーナ部 ２４ａ コーナ部 ２５ スタビン
グフランク面 ２５ａ スタビングフランク面 ２６ ロードフ
ランク面 ２６ａ ロードフランク面 ２７ コーナ部 ２７ａ コーナ部 ２８ 点10 Fitting 11 Tapered Male Thread 12 Tapered Female Thread 13 Male Thread 13a Male Thread 13c Male Thread 13d Male Thread 13e Male Thread 13f Male Thread 13g Male Thread 13h Male Thread 13i Male Thread 13j Male Thread 13k Male Thread 13m 13p Male thread 13q Male thread 13r Male thread 13s Male thread 13t Male thread 14 17f Female Thread 17g Female Thread 17h Female Thread 17i Female Thread 17j Female Thread 17k Female Thread 17m Female Thread 17n Female Thread 17p Female Thread 17q Female Thread 17r Female Thread 1 s Female thread 17t Female thread 18 Valley 18a Valley 19 Pipe 20 Tip 20a Tip 22 Thread top 22a Thread top 23 Load flank 23a Load flank 24 Corner 24a Corner 25 Stabbing flank 25a Stabbing flank 26 Road flank surface 26a Road flank surface 27 Corner 27a Corner 28 points
Claims (7)
形成したピンと、短管の両端部の内周面に前記テーパ雄
ねじ部に螺合するテーパ雌ねじ部を形成したボックスと
をねじ込む管継手において、 多条ねじを適用し、奇数条の場合は、（条数−１）山お
きに配置された高い雄、雌ねじ山と、該高い雄、雌ねじ
山間に配置された低い雄、雌ねじ山とからなるねじ列と
し、 偶数条の場合は、高い雄、雌ねじ山と低い雄、雌ねじ山
とを交互に配置したねじ列とするか、又は（条数−１）
山おきに配置された高い雄、雌ねじ山と、該高い雄、雌
ねじ山間に配置された低い雄、雌ねじ山とからなるねじ
列とすることを特徴とする管継手。1. A tube for screwing a pin having a tapered male thread formed on the outer peripheral surface of a distal end portion of a tube, and a box having a tapered female thread formed on the inner peripheral surfaces of both ends of the short tube to be screwed with the tapered male thread. In the joint, a multi-thread is applied, and in the case of an odd number of threads, a high number of male and female threads arranged at every (number of threads-1) ridges, and a low male and female threads arranged between the high male and female threads are provided. In the case of even-numbered threads, a thread row in which high male and female threads and low male and female threads are alternately arranged, or (number of threads -1)
A pipe joint characterized by a thread row comprising high male and female threads arranged at every ridge and low male and female threads arranged between the high male and female threads.
山のねじ山頂面は、角ねじ又は台形ねじのように所定の
幅を有し、前記両ねじ山頂面を、管軸に平行な面に対し
て平行又は、ねじ列テーパ面と反対方向に傾斜させる請
求項１記載の管継手。2. The thread crest of the male thread and the thread crest of the female thread have a predetermined width, such as a square screw or a trapezoidal screw, and the two thread crests are parallel to a pipe axis. The pipe joint according to claim 1, wherein the pipe joint is inclined parallel to or in a direction opposite to the tapered surface of the thread array.
山のねじ山頂面は、角ねじ又は台形ねじのように所定の
幅を有し、前記両ねじ山頂面の一部を管軸に平行にする
と共に、残りの該両ねじ山頂面を前記管軸に平行な面に
対してねじ列テーパ面と反対方向に傾斜させる請求項１
記載の管継手。3. A thread crest of the male thread and a thread crest of the female thread have a predetermined width like a square screw or a trapezoidal thread, and a part of both thread crests is parallel to a pipe axis. And the remaining two thread crests are inclined in a direction opposite to a thread row taper surface with respect to a surface parallel to the tube axis.
The described pipe fitting.
部に差し込む際、前記雄ねじ山のねじ山頂面に接する仮
想テーパ面と前記雌ねじ山のねじ山頂面に接する仮想テ
ーパ面とが競り合う状態において、そのまま前記テーパ
雄ねじ部を鉛直方向に下げると前記雄ねじ山のねじ山頂
面が前記雌ねじ山のねじ山頂面に競ることなく、前記雄
ねじ山のスタビングフランク面が前記雌ねじ山のスタビ
ングフランク面に重なることが可能な元の雄ねじ列と雌
ねじ列との位置関係を再現できるように、ねじ切り加工
時に前記テーパ雄ねじ部及び前記テーパ雌ねじ部の円周
方向に符合させる印を付けた請求項１〜３のいずれか１
項に記載の管継手。4. When the tapered male screw portion is inserted into the tapered female screw portion, the virtual taper surface in contact with the thread crest surface of the male thread and the virtual taper surface in contact with the screw crest surface of the female thread compete with each other. When the tapered male thread portion is lowered in the vertical direction, the thread crest surface of the male thread does not compete with the thread crest surface of the female thread, and the stubbing flank surface of the male thread overlaps the stubbing flank surface of the female thread. Any one of claims 1 to 3, wherein, in order to reproduce the positional relationship between the original male screw row and the female screw row that can be performed, a mark is made to match the circumferential direction of the tapered male screw section and the tapered female screw section during thread cutting. Or 1
The pipe joint according to item.
び前記テーパ雌ねじ部のそれぞれのねじ列テーパ面の相
対的直径誤差を考慮して、ねじの加工誤差を考慮しない
理想的な雄ねじ列及び雄ねじ列の差し込み直後のねじ込
みを可能とする所定範囲の適正位置関係の内、前記テー
パ雄ねじ部の雄ねじ山のねじ山頂面とスタビングフラン
ク面とのコーナ部の位置が常に適正範囲の中央に来るよ
うにした請求項１〜４のいずれか１項に記載の管継手。5. An ideal male screw array and male screw array that take into account the relative diameter error of the respective tapered tapered surfaces of the tapered male screw portion and the tapered female screw portion during thread cutting, and do not consider screw processing errors. Of the appropriate positional relationship within a predetermined range that allows screwing immediately after insertion, the position of the corner between the thread crest surface of the external thread of the tapered male screw portion and the stubbing flank is always at the center of the appropriate range. The pipe joint according to any one of claims 1 to 4.
ねじの加工誤差より大きい請求項５記載の管継手。6. The pipe joint according to claim 5, wherein, in an ideal state, the appropriate range is larger than a machining error of the screw.
雌ねじ部に続くスタビングガイドを備えた請求項１〜６
のいずれか１項に記載の管継手。7. A stubbing guide following the tapered female screw portion at a pipe end of the tapered female screw portion.
The pipe joint according to any one of the above.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01504698A JP3756652B2 (en) | 1998-01-08 | 1998-01-08 | Pipe fitting |
| CA002279899A CA2279899C (en) | 1997-12-04 | 1998-12-02 | Pipe joint |
| GB9917986A GB2335719B (en) | 1997-12-04 | 1998-12-02 | Pipe joint |
| US09/355,704 US6705648B1 (en) | 1997-12-04 | 1998-12-02 | Pipe joint |
| PCT/JP1998/005445 WO1999028665A1 (en) | 1997-12-04 | 1998-12-02 | Pipe joint |
| NO19993760A NO334890B1 (en) | 1997-12-04 | 1999-08-03 | A pipe joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01504698A JP3756652B2 (en) | 1998-01-08 | 1998-01-08 | Pipe fitting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11201344A true JPH11201344A (en) | 1999-07-30 |
| JP3756652B2 JP3756652B2 (en) | 2006-03-15 |
Family
ID=11877901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01504698A Expired - Fee Related JP3756652B2 (en) | 1997-12-04 | 1998-01-08 | Pipe fitting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3756652B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004360908A (en) * | 2003-05-30 | 2004-12-24 | Hilti Ag | Quick connecting joint |
| US7494159B2 (en) | 2004-08-27 | 2009-02-24 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipes |
| WO2011054161A1 (en) * | 2009-11-04 | 2011-05-12 | 天津钢管集团股份有限公司 | Hermetic threaded joint |
| WO2018216375A1 (en) * | 2017-05-25 | 2018-11-29 | 新日鐵住金株式会社 | Threaded joint for steel pipes |
| JP2021123934A (en) * | 2020-02-05 | 2021-08-30 | Ｊｆｅスチール株式会社 | Multiple thread screw joint, steel pipe with joint, structure, construction method of structure, and design method and manufacturing method of multiple thread screw joint |
-
1998
- 1998-01-08 JP JP01504698A patent/JP3756652B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004360908A (en) * | 2003-05-30 | 2004-12-24 | Hilti Ag | Quick connecting joint |
| US7494159B2 (en) | 2004-08-27 | 2009-02-24 | Sumitomo Metal Industries, Ltd. | Threaded joint for steel pipes |
| WO2011054161A1 (en) * | 2009-11-04 | 2011-05-12 | 天津钢管集团股份有限公司 | Hermetic threaded joint |
| WO2018216375A1 (en) * | 2017-05-25 | 2018-11-29 | 新日鐵住金株式会社 | Threaded joint for steel pipes |
| JPWO2018216375A1 (en) * | 2017-05-25 | 2019-11-21 | 日本製鉄株式会社 | Threaded joints for steel pipes |
| RU2721075C1 (en) * | 2017-05-25 | 2020-05-15 | Ниппон Стил Корпорейшн | Threaded joint for steel pipes |
| JP2021123934A (en) * | 2020-02-05 | 2021-08-30 | Ｊｆｅスチール株式会社 | Multiple thread screw joint, steel pipe with joint, structure, construction method of structure, and design method and manufacturing method of multiple thread screw joint |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3756652B2 (en) | 2006-03-15 |
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