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Analysis of Critical Wear Phenomena and Stress Induced in WC–Co-Based Twist Drill Bits Used for Drilling Hard Rock
The present work deals with the drilling of granite by using WC–Co cemented carbide-based twist drill bits. Two drill bits were considered in this work, one with 10% Co content and another with 12% Co content. Drilling of rock samples was performed on a bench drilling machine. Five holes were created in each rock sample. The drilling time of every hole was kept common, i.e., 2 min. The thrust imposed on drill bits was measured by using a drill tool dynamometer. Two main observations were made in the work. They are (a) critical wear phenomena in the tip of the drill bit. For this, a field emission scanning electron microscope was used under study. Wear modes like cracks in WC grains, crushing of WC grains, cavity formation, and rock intermixing with binder material were mainly reported; (b) stress and deformation prediction on the drill bit by using finite element analysis. For this, ANSYS software was used in the work. The purpose of the study was to simulate the in situ rock drilling operation which is usually done in mines. Wear analysis is an important approach to understanding the damage behavior of the tool so that the constituent materials can be altered to avoid pre-mature failure of the tool.
Analysis of Critical Wear Phenomena and Stress Induced in WC–Co-Based Twist Drill Bits Used for Drilling Hard Rock
The present work deals with the drilling of granite by using WC–Co cemented carbide-based twist drill bits. Two drill bits were considered in this work, one with 10% Co content and another with 12% Co content. Drilling of rock samples was performed on a bench drilling machine. Five holes were created in each rock sample. The drilling time of every hole was kept common, i.e., 2 min. The thrust imposed on drill bits was measured by using a drill tool dynamometer. Two main observations were made in the work. They are (a) critical wear phenomena in the tip of the drill bit. For this, a field emission scanning electron microscope was used under study. Wear modes like cracks in WC grains, crushing of WC grains, cavity formation, and rock intermixing with binder material were mainly reported; (b) stress and deformation prediction on the drill bit by using finite element analysis. For this, ANSYS software was used in the work. The purpose of the study was to simulate the in situ rock drilling operation which is usually done in mines. Wear analysis is an important approach to understanding the damage behavior of the tool so that the constituent materials can be altered to avoid pre-mature failure of the tool.
Analysis of Critical Wear Phenomena and Stress Induced in WC–Co-Based Twist Drill Bits Used for Drilling Hard Rock
J. Inst. Eng. India Ser. D
Dewangan, Saurabh (author) / Anjan, K. L. (author) / Sagar, Nagiripenta Manu Vidya (author) / Reddy, Aaluri Praveen (author)
Journal of The Institution of Engineers (India): Series D ; 105 ; 689-700
2024-08-01
12 pages
Article (Journal)
Electronic Resource
English
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