Abstract
This paper deals with an experimental analysis of deep-hole drilling with supply of high pressure oil. Three characteristics are examined by comparing with normal drilling; that is, critical depth of drilling, surface roughness of drilled holes and tool wear (or tool life). The results obtained are as follows : (1) The supply of high pressure oil accelerates easy removal of chips from the flutes of the drill with oil holes. Deep holes more than ten times of drill diameter can be obtained for carbon steel (S45C) and holes more than fifteen times of drill diameter for stainless steel (SUS 303). (2) The surface roughness of drilled holes is reduced to half compared with that obtained in normal drilling. (3) The supply of high pressure oil suppresses the increase of tool wear and prolongs tool life of the drill by two to three times even for difficult-to-cut material (SUS 304).
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