This paper investigates the performance of small diameter high-speed steel twist drills drilling boreholes with a depth of ten times the diameter into carbon steel AISI 1045 using minimum quantity lubrication. The performance of small twist drills is determined, first, by their deep-hole drilling capability, i.e., in how far the cutting forces can be kept at a noncritical level by maintaining the chip disposal, and, second, by their tool life. This work shows that both the deep-hole drilling capability and tool life of small drills are strongly dependent on their geometry, in particular the size of the chip flutes, and the flute surface topography.

Issue Section:
Technical Papers
Keywords:
drilling, drilling machines, tool steel, carbon steel, lubrication, cutting, surface topography, deep-hole drilling, twist drills, swarf disposal, tool life, MQL
Topics:
Cutting, Drilling, Drills (Tools)
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 by American Society of Mechanical Engineers
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