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Analytical investigations of the accuracy of the small diameter tool-joint tapered thread made by a lathe machining

Onysko Oleh, Kopei Volodymyr, Medvid Iulia, Panchuk Vitalii, Pituley Lolita, Vryukalo Viktor

New Trends in Production Engineering

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2019

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Vol. 2, Iss. 1

268--276

EN

The drill string consists of connected drill pipes and other elements. The connection is carried out by screwing of the drill string elements with the help of tool-joint tapered thread. The operational characteristics of the drill pipes depend of the manufacture precision of these tool-joints mostly. The accuracy of the thread is regulated by the accuracy of its profile and the accuracy of its pitch diameter value. The accuracy of the tapered thread manufacturing on the lathe in its depending on the values of the geometric parameters of the lathe tool and the values of deviations of its installation relatively to the workpiece axis is investigated. It is proved that for the tapered thread of form VI profile used for connection of drill pipes with the diameter from 30 mm to 44 mm the most influential factor, in relation to the accuracy of the thread profile is the value of the rake angle. Application of the rake angle value up to -5° according to the research data leads to a deviation from the specified profile of 0.3°, which is more than 35% of the declared standard tolerance on deviations from the profile. Also, the influence of the back rake angle value on the value of the deviation from the standard pitch diameter of the thread is proved. It is proved that the magnitude of the tangential displacement of the nose of the cutter relatively to the axis of the thread up to -0.2 mm can cause a deviation of the profile angle of 0.18°, which is 27% of the standard tolerance.

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Jakość gwintów wewnętrznych walcowanych i nagniatanych głowicami rolkowymi

Okoński S., Moszumański R., Tabor A.

Problemy Eksploatacji

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2010

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nr 4

163-175

PL

Gwinty kształtowane plastycznie mają szereg zalet. Możliwe jest uzyskanie niskiej chropowatości powierzchni i dużej dokładności. Gwint ma podwyższoną wytrzymałość na ścinanie i docisk powierzchniowy. Przeprowadzono badania wymiarów i chropowatości powierzchni gwintów walcowanych i nagniatanych oraz badania porównawcze wytrzymałości na ścinanie gwintów walcowanych i skrawanych. Ponadto przeprowadzono badania mikrostruktur oraz wyznaczono rozkłady twardości HV0,1 na przekrojach gwintów walcowanych.

EN

The threads fabricated by plastic working offer a number of indisputable advantages. It is possible to obtain low surface roughness and high accuracy. The threads are characterised by high shear strength and surface pressure. The dimensions and surface roughness of the threads were checked and the shear strength of the rolled and machined threads was compared. Additionally, microstructural examinations were made on cross-sections of the rolled threads and hardness distribution was determined.

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Poprawka na skręcenie wałeczków w pomiarze średnicy podziałowej gwinta sposobem trójwałeczkowym. Rys historyczny.

Malinowski J., Płowucha W., Wojtyła M.

Mechanik

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2007

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R. 80, nr 10

808-808

PL

W roku 2007 mija 100 lat od opublikowania pierwszej wersji wzoru na poprawkę korygującą skręcenie wałeczków w pomiarze średnicy podziałowej gwintu sposobem trójwałeczkowym. W tym okresie zarówno wzór na poprawkę, jak i sam sposób pomiaru były doskonalone. Poprawce na skręcenie wałeczków poświęcono szczególnie dużo publikacji i badań naukowych. Obecnie pomiary średnicy podziałowej sposobem trójwałeczkowym nie straciły na ważności i nadal są wykorzystywane w metrologii będącej na usługach budowy maszyn.

EN

It is a century now in 2007 since the first edition of the formula to handle correction for off square position of the rollers in the three-rollers method of the thread pitch diameter has been published. Both the formula itself as well as the measurement method have been improved throughout this period. The literature and research report papers related to this correction for the off-square position of the rollers is particularly abundant.

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The Surface Condition of Pulleys in Use

Domek G., Kołodziej A.

Machine Dynamics Problems

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2006

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Vol. 30, No. 3

72-78

EN

The thesis describes problems of pulleys manufacturing faults. Furthermore, the changes performed by manufacturers and most often construction damages have been described. The basic aim of the thesis was to present the problem of pulleys technical condition, which is essential for cogbelt and pulleys coupling.