Kinematics of the Tapered Thread Machining by Lathe: Analytical Study

Medvid, Iuliia; Onysko, Oleh; Panchuk, Vitalii; Pituley, Lolita; Schuliar, Iryna

doi:10.1007/978-3-030-68014-5_54

Cited by 16 publications

(6 citation statements)

References 20 publications

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“…Theoretical studies of the kinematics of the process of turning tapered thread using a tool with a non-zero value of the rake angle are presented in studies [60,74]. However, the scientific results in these papers concern the analytical calculations of the accuracy of the kinematics of turning the thread [74] and its predicted lead angle [60], and not its profile. Experimental studies of the influence of the error of setting the threaded cutter on the deviation of the real profile of the thread were carried out in [75].…”

Section: Geometrical Explanation Of Manufactured Screw Thread As Conv...mentioning

confidence: 99%

Analytical Model of Tapered Thread Made by Turning from Different Machinability Workpieces

Onysko,

Kopei,

Barz

et al. 2024

Machines

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High-precision tapered threads are widely used in hard-loaded mechanical joints, especially in the aggressive environment of the drilling of oil and gas wells. Therefore, they must be made of workable materials often difficult to machine. This requires the use of high-performance cutting tools, which means the application of non-zero geometric parameters: rake and edge inclination angles. This study is based on analytical geometry methodology and describes the theoretical function of the thread profile as convoluted surfaces dependent on the tool’s geometric angles. The experiments were conducted using a visual algorithm grounded on the obtained function and prove the practical use of the scientific result. They predict the required accuracy of thread made using a lathe tool with a rake angle of up to 12°.

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Section: Geometrical Explanation Of Manufactured Screw Thread As Conv...mentioning

confidence: 99%

Analytical Model of Tapered Thread Made by Turning from Different Machinability Workpieces

Onysko,

Kopei,

Barz

et al. 2024

Machines

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“…A characteristic feature drilling and oil and gas equipment is used in its composition of a large number of threaded ones connections. Reliability and durability of threaded connections is achieved through a rational approach selection of materials and coatings [4,5,6], precision parameters of mechanical processing [7,8,9] and indicators of the quality of the working surfaces of the nozzles [10,11,12], including taking into account the technological heredity [13], and lubrication [14] to ensure the operability of products throughout their lifetime cycle [15,16].…”

Section: Literature Reviewmentioning

confidence: 99%

Accuracy of Thread Profile Depends on the Lathe Tool Angle of Inclination. Theoretical Investigation

Onysko

Kusyi

Kopei

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Among threaded connections of large sizes, tapered thread pipe connections are especially often used, which are a very important part of drill strings. The efficiency of the drill strings largely depends on the accuracy of the tool-joint tapered thread. The production of such joints is implemented on lathes, with the help of tools that have a carbid insert. To ensure high performance, such inserts are recommended to be installed not parallel to the axis of the thread, but at the lead angle of thread. However, the profile of the insert itself is equal to the profile of the thread, and therefore it is important to have a theoretical predictive calculation of the probable influence of the angular setting of the carbide insert on the accuracy of the thread. Based on a detailed consideration of the geometry of the mutual placement of the plate and the tapered thread and the kinematic features of the process, an algorithm for predictive calculation of the accuracy of the thread is created. The result shows that only one of the parameters of the cutting edge really depends on the angle of inclination of the cutting edge - it is its profile. The deviation can reach 7% of the tolerance on the semi-profile angle.

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“…The effect of the accuracy of the profile pin threads for equivalent stresses, fatigue safety indicators, and contact pressure in drill pipe joints are studied in paper [14].…”

Section: Literature Reviewmentioning

confidence: 99%

Prediction of the Accuracy of the Tapered Thread Profile

Panchuk¹,

Onysko²,

Kotwica³

et al. 2021

JES

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The efficiency of drill string largely depends on the pipe-end connector’s accuracy named tapered thread tool joint. Most of those are made by using lathes. Turning tools were made with a profile identical to the thread profile, and all well-known world brands’ plants make the back rake angle of such a cutter with zero value. This is obviously due to the lack of a precise algorithm for calculating the cutter profile and ensuring the accuracy of the tapered thread profile. A virtual experiment was carried out of three-dimensional modeling of the process for shape creation. It showed that in the case of lathe machining of the thread of NC23 type, the deviation from the nominal half profile of the obtained thread is only 0.02°. This result prompted the decision to propose a new algorithm for predictive calculation of the half-angle of the cut profile based on the parameter associated with actual turning – the working height of the profile – h in contrast to previous scientific sources where this calculation was based on the parameter H – not truncated thread Height which is associated with the theoretical base of the accuracy of the thread. The result of the program application, created based on the algorithm proposed in the article, showed that the predicted accuracy of the obtained profile’s half-angle could be in a range from –0.03° to +0.10°, which is equivalent to 4–13 % of tolerance of this dimension.

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Kinematics of the Tapered Thread Machining by Lathe: Analytical Study

Cited by 16 publications

References 20 publications

Analytical Model of Tapered Thread Made by Turning from Different Machinability Workpieces

Analytical Model of Tapered Thread Made by Turning from Different Machinability Workpieces

Accuracy of Thread Profile Depends on the Lathe Tool Angle of Inclination. Theoretical Investigation

Prediction of the Accuracy of the Tapered Thread Profile

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