Abstract
Single-lip deep hole drilling process is employed to fabricate high-aspect-ratio holes; however, its performance is severely degraded when it is used to machine Inconel 718. Excessive tool wear, chip clogging, and out-of-tolerance holes were observed during the process. Due to its unique unsymmetrical geometry, single-lip drill experiences high wear rate at the bearing pads despite high-pressure coolant supply during drilling. In this chapter, microtextures were introduced on the bearing pad surfaces to address the tool wear issues in deep hole drilling. The most effective microstructure geometries were identified based on the experimental studies, which led to improved tool life, machined surface quality, and drill stability.
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