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WO2008008002A2 - Procédé de formation d'un filetage interne dans la partie d'extrémité d'un blanc tubulaire - Google Patents

Procédé de formation d'un filetage interne dans la partie d'extrémité d'un blanc tubulaire Download PDF

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Publication number
WO2008008002A2
WO2008008002A2 PCT/RU2007/000361 RU2007000361W WO2008008002A2 WO 2008008002 A2 WO2008008002 A2 WO 2008008002A2 RU 2007000361 W RU2007000361 W RU 2007000361W WO 2008008002 A2 WO2008008002 A2 WO 2008008002A2
Authority
WO
WIPO (PCT)
Prior art keywords
thread
end section
outer diameter
threaded
internal thread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/RU2007/000361
Other languages
English (en)
Russian (ru)
Other versions
WO2008008002A3 (fr
Inventor
Albert Sergeevich Ezhev
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nauchno-Vnedrencheskiy Tsentr Mashiny I Oborudova Nie Dlya Energetiki'
Original Assignee
Nauchno-Vnedrencheskiy Tsentr Mashiny I Oborudova Nie Dlya Energetiki'
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nauchno-Vnedrencheskiy Tsentr Mashiny I Oborudova Nie Dlya Energetiki' filed Critical Nauchno-Vnedrencheskiy Tsentr Mashiny I Oborudova Nie Dlya Energetiki'
Publication of WO2008008002A2 publication Critical patent/WO2008008002A2/fr
Publication of WO2008008002A3 publication Critical patent/WO2008008002A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/56—Making machine elements screw-threaded elements

Definitions

  • the invention relates to the field of manufacturing products from pipes by methods of mechanical processing by pressure, specifically to the formation of an internal thread at the end portion of a pipe billet, mainly at the sleeve end of a sub for tubing.
  • the thread obtained by cutting is a stress concentrator, the metal structure in the thread zone has cut fibers, which reduces the strength characteristics of the part.
  • a thin-walled tubular billet is placed in a matrix with a threaded hole corresponding to the required parameters of the obtained thread, and its plastic deformation is carried out by distributing it from the inside, mainly by the method of “great magnetizing”, giving a thin wall with a wavy shape close to the profile of the matrix thread, as with the internal , and from the outside (see RU 2259459 C2, 7 B21D 51/10, published on 08.27.2005).
  • This method is the closest analogue
  • section of the pipe billet is carried out by crimping it in one pass with a conical matrix with a calibrating girdle, the diameter of which is equal to the outer diameter of the finished part, where: D 311 is the outer diameter of the workpiece,
  • the preform is heated before plastic deformation to a temperature below the temperature of the onset of scale formation, and the formation
  • threads are in the mode of semi-hot stamping.
  • the formation of the thread can be carried out using a retaining ring, the outer diameter of which is less than the diameter of the calibrating belt of the matrix by the amount of clearance
  • FIG. 1 - 2 shows the initial billet and technological equipment for forming a thread according to the method in question in the initial position, and Fig. 2 - a part with a molded thread, as well as technological equipment for forming a thread according to the method in question in the final position.
  • the pipe billet 1 end (sleeve) section is placed on the threaded punch 2 having a thread profile corresponding to the required parameters of the resulting thread.
  • a conical matrix 3 is installed outside of the workpiece 1, with a calibrating girdle 4, the diameter of which is equal to the outer diameter of the finished part 5.
  • the pipe workpiece 1 can be mounted on the retaining ring 6. According to the method in question, by any known technology
  • This mathematical expression is obtained by calculation, based on the assumption that all threaded grooves in the threaded punch are completely filled due to the displaceable volume of the workpiece during radial metal flow during plastic deformation. In fact, metal flows in both radial and axial directions. Therefore in individual In cases, an additional displaced volume may be provided, for example, by increasing the outer diameter of the workpiece, which is established experimentally.
  • the blank 1 made with the above parameters of the end section is placed on the threaded punch 2, the conical matrix 3 is installed outside the blank 1 with a calibrating girdle 4, and the matrix 3 is pressed on the press (not shown) with crimping the end section of the blank 1 in one pass and with the redistribution of the metal of the workpiece 1 in the threaded grooves of the punch 2.
  • the threaded grooves of the punch 2 and the working surfaces of the matrix 3 can be pre-lubricated.
  • the workpiece 1 before plastic deformation can be heated to a temperature below the temperature of the onset of scale formation, and thread formation in this case is carried out in the mode of semi-hot stamping.
  • the formation of the thread can also be carried out using the retaining ring 6 to create an annular gap between the outer surface of the retaining ring 6 and the inner surface of the calibrating girdle 4 of the matrix 3, where the excess metal of the workpiece 1 is forced out after the threaded grooves of the punch 2 are completely filled (see Fig. 2 )
  • the resulting part 5 with an internal thread is screwed from the threaded punch 2.
  • the technical result is to obtain high-quality full-profile internal thread at the end section of the pipe billet, in particular, at the sleeve end of the sub for tubing, the most productive technological method is the stamping method.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

L'invention concerne la fabrication d'articles tubulaires au moyen de procédés de traitement mécanique par pression et plus précisément par la formation d'un filetage interne, notamment sur l'extrémité à manchon d'un raccord pour tuyaux à pompe et compresseur. L'invention concerne plus particulièrement un procédé de formation d'un filetage interne dans la partie d'extrémité d'un blanc de tuyau par procédé d'estampage. Selon l'invention, on prépare d'abord un blanc de tuyau possédant un diamètre de la partie d'extrémité qui est égal au diamètre interne de la matrice de filetage et le diamètre interne déterminé selon une formule, et la déformation plastique de la partie d'extrémité se fait en un passage par un poinçon conique avec une ceinture de calibration dont le diamètre est égal au diamètre interne de la pièce finale. L'invention permet d'améliorer la fiabilité d'un raccord fileté de tuyau à pompe et compresseur et simplifie la technologie de formation du filetage.
PCT/RU2007/000361 2006-07-12 2007-07-04 Procédé de formation d'un filetage interne dans la partie d'extrémité d'un blanc tubulaire Ceased WO2008008002A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2006124853 2006-07-12
RU2006124853/02A RU2323059C1 (ru) 2006-07-12 2006-07-12 Способ формирования внутренней резьбы на концевом участке трубной заготовки

Publications (2)

Publication Number Publication Date
WO2008008002A2 true WO2008008002A2 (fr) 2008-01-17
WO2008008002A3 WO2008008002A3 (fr) 2008-03-06

Family

ID=38923704

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RU2007/000361 Ceased WO2008008002A2 (fr) 2006-07-12 2007-07-04 Procédé de formation d'un filetage interne dans la partie d'extrémité d'un blanc tubulaire

Country Status (2)

Country Link
RU (1) RU2323059C1 (fr)
WO (1) WO2008008002A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101574846B (zh) * 2008-05-06 2013-02-13 鸿富锦精密工业（深圳）有限公司 螺纹模具

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2077485B1 (fr) * 1970-01-22 1973-05-25 Creuzet Robert
SU700268A1 (ru) * 1978-02-27 1979-11-30 Ryabtsev Sergej T Способ получени внутренней резьбы на заготовке
DE3300029A1 (de) * 1983-01-03 1984-07-05 Wilhelm Fette Gmbh, 2053 Schwarzenbek Verfahren zum herstellen von gewinden und einrichtung zur durchfuehrung des verfahrens
SU1274832A1 (ru) * 1984-12-24 1986-12-07 Специальное Конструкторское Бюро Часового И Камневого Станкостроения Способ получени внутренней резьбы
US6371224B1 (en) * 2000-03-09 2002-04-16 Brush Wellman, Inc. Threaded spacer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101574846B (zh) * 2008-05-06 2013-02-13 鸿富锦精密工业（深圳）有限公司 螺纹模具

Also Published As

Publication number Publication date
WO2008008002A3 (fr) 2008-03-06
RU2323059C1 (ru) 2008-04-27
RU2006124853A (ru) 2008-01-20

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