Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/138041
Title: A STUDY ON BURNISHING AND SELF-PILOTING MECHANISM FOR HIGH PRECISION DEEP HOLE DRILLING OF INCONEL 718
Authors: MALARVIZHI SANKARANARAYANASAMY
Keywords: deep hole drilling, Inconel 718, burnishing, self-piloting,micro textures
Issue Date: 22-Aug-2017
Citation: MALARVIZHI SANKARANARAYANASAMY (2017-08-22). A STUDY ON BURNISHING AND SELF-PILOTING MECHANISM FOR HIGH PRECISION DEEP HOLE DRILLING OF INCONEL 718. ScholarBank@NUS Repository.
Abstract: Gundrilling is a high-precision hole making operation used to fabricate oilfield logging tools. However, the high hot hardness and abrasive nature of Inconel 718 alloys used in the manufacturing of logging tools promotes gundrill wear and rapidly deteriorates hole quality. This work details influence of bearing pad on gundrill stability, wear and hole quality. We provide an analytical formulation of burnishing forces for gundrills with single and multi-pad configuration and a procedure to determine its self-piloting efficacy. Drill stability was categorized as positive, neutral, and negative based on the analytical model and the drill’s tendency to yaw, pitch and roll. To minimize the drill instability and improve hole surface quality two are methods here: (I) optimal selection of cutting-edge and bearing pad configuration based on self-piloting efficacy calculation; (II) introduction of micro-textures. Thus, theoretical background and countermeasures to control drill wear and improve hole quality are presented here.
URI: http://scholarbank.nus.edu.sg/handle/10635/138041
Appears in Collections:Ph.D Theses (Open)

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