Abstract
The flank wear (VB) of cemented carbide tool affected by cutting fluids, that is, water soluble cutting fluid (W.S; JIS WI-1) and non-water soluble one (Non-W.S; JIS 2-3) was studied in drilling tests of S45C. When the true cutting speeds (vi) at the fixed position of cutting edge were noted, a single curve was obtained between VB and vi for each fluid, the shape of curve being very similar to the one well known in dry turning tests. It was found that the VB-vi curve of W.S shifted to the higher speed side comparing with the one of Non-W.S, so that the VB at lower vi increased markedly for W.S. It was also found that the VB at low vi was promoted for W.S, because carbide grains dropped out from the cutting edge plowed the flank face. This phenomenon in W.S was attributed to the so much larger cooling effect of W.S than the other.
