PL22945B1 - Method to prevent abrasion of threads. - Google Patents
Method to prevent abrasion of threads. Download PDFInfo
- Publication number
- PL22945B1 PL22945B1 PL22945A PL2294534A PL22945B1 PL 22945 B1 PL22945 B1 PL 22945B1 PL 22945 A PL22945 A PL 22945A PL 2294534 A PL2294534 A PL 2294534A PL 22945 B1 PL22945 B1 PL 22945B1
- Authority
- PL
- Poland
- Prior art keywords
- threads
- thread
- metal
- coating
- fact
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 5
- 238000005299 abrasion Methods 0.000 title claims description 4
- 239000000463 material Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052793 cadmium Inorganic materials 0.000 claims description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 229910001092 metal group alloy Inorganic materials 0.000 claims 2
- 239000007788 liquid Substances 0.000 claims 1
- 238000005272 metallurgy Methods 0.000 claims 1
- 238000005065 mining Methods 0.000 claims 1
- 238000005507 spraying Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000011805 ball Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Description
Przedmiotem niniejszego wynalazku jest sposób zapobiegania scieraniu sie gwintów, w szczególnosci gwintów rur wiertniczych. Poniewaz rury tego ro¬ dzaju sa wielokrotnie rozsrubowywa- ne i zesrubowywane, wiec po pewnem starciu sie gwintów rozsrubowanie staje sie mozliwe jedynie przy stosowaniu wiel¬ kiej sily, wskutek czego gwint zostaje zu¬ pelnie zniszczony. Konieczne wiec bylo odcinanie gwintowanych konców rur i na¬ cinanie nowych gwintów.Badania wykazaly, iz powodem sciera¬ nia sie gwintów sa zmiany w strukturze ich materjalu, powstale wskutek przekro¬ czenia granicy wytrzymalosci na rozerwa¬ nie. Te niepozadane miejscowe naprezenia materjalu rozpoczynaja sie w miejscach, w których tarcie na powierzchni gwintów przekracza wytrzymalosc materjalu, z którego gwinty sa wykonane. Srodki, sto¬ sowane dotychczas w celu zmniejszenia tarcia na powierzchni gwintów, a wiec lój, grafit albo mieszaniny tych materjalów z pylem metalowym, zawiodly, poniewaz przy koniecznem silnem dokrecaniu gwin¬ tów i ich ogrzewaniu srodki te stawaly sie tak plynnemi, iz byly wytlaczane.Konieczne jest zatem stosowanie takie¬ go srodka smarowniczego powierzchni gwintów, który posiada wyzsza granice topnienia, niz istniejace temperatury (do 70°C), oraz który nawet po znieksztalce¬ niu posiada nizsza granice plynnosci, nizmaterjal gwintu. Jaka srodki tego rodzaju nadaja sie zwlaszcza cyna, olów, cynk, kadm, glin, miedz, jak tez ich stopy. Moz¬ na równiez stosowac równoczesnie wieksza ilosc tych materjalów, które dobiera sie tak, iz granice ich plynnosci zmniejszaja sie od powierzchni gwintu ku zewnatrz.Materjal ten musi byc tak scisle polaczony z powierzchnia gwintów, aby przy napre¬ zeniach, spowodowanych dokrecaniem, nie oddzielal od gwintów i tworzyl sta¬ la warstwe, oddzielajaca jeden gwint od drugiego.Wykonywanie takiej powloki na dro¬ dze elektrolitycznej, stosowane do nasad rur o malej dlugosci, nie jest mozliwe na rurach o wielkiej dlugosci, np. rurach wiertniczych, poniewaz urzadzenia dla tego celu bylyby drogie, a wiec nieekonomiczne.To samo dotyczy nakladania powloki na goraco. Próby wykazaly, iz osiaga sie ko¬ rzystnie wyniki, jezeli rury umiesci sie po¬ ziomo i ich gwinty zaopatrzy sie podczas obracania w powloke zapomoca natryski¬ wania w znany sposób. Konieczne jest przed natryskiwaniem uczynic powierzch¬ nie gwintów nieco szorstka, co nie szkodzi trwalosci gwintów. Gwinty rur, zaopatrzo¬ ne w taka powloke, nie zostaja uszkodzo¬ ne nawet przy skrecaniu ich z sila, wiek¬ sza od normalnie stosowanej. Powloka chroni równiez gwinty od rdzy. PLThe present invention relates to a method of preventing abrasion of threads, in particular drill pipe threads. Since pipes of this type are repeatedly unscrewed and screwed together, after some wear of the threads, unscrewing becomes possible only with the application of great force, whereby the thread is completely destroyed. It was therefore necessary to cut off the threaded ends of the pipes and cut new threads. Studies have shown that the causes of abrasion of the threads are changes in the structure of their material caused by exceeding the limit of breaking strength. These undesirable local stresses in the material begin where the friction on the surface of the threads exceeds the strength of the material from which the threads are made. The measures previously used to reduce the friction on the surface of the threads, that is, ball, graphite or mixtures of these materials with metal dust, have failed, because with the necessary tightening of the threads and their heating, these agents become so fluid that they were extruded It is therefore necessary to use a lubricant for the surface of the threads which has a higher melting limit than the existing temperatures (up to 70 ° C) and which, even after deformation, has a lower flow limit, the material of the thread. Which substances of this kind are suitable, especially tin, lead, zinc, cadmium, aluminum, copper, as well as their alloys. It is also possible to use a greater number of these materials at the same time, which are selected so that the limits of their fluidity decrease from the surface of the thread to the outside. This material must be so tightly connected to the surface of the threads that it does not separate when stressed by tightening. from the threads and forms a solid layer separating one thread from the other. The application of such a coating on an electrolytic path, applied to the ends of pipes of short length, is not possible on pipes of great length, e.g. drill pipes, because the devices for this would be expensive and therefore wasteful. The same is true for hot coating. Tests have shown that advantageous results are obtained if the pipes are placed horizontally and their threads are fitted during rotation into the coating by spraying in a known manner. It is necessary to roughen the thread surfaces somewhat before spraying in order not to compromise the durability of the threads. The threads of the pipes provided with such a coating are not damaged even when twisted with a force greater than that normally used. The coating also protects the threads from rust. PL
Claims (3)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL22945B1 true PL22945B1 (en) | 1936-04-30 |
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