Tool Wear Reduction Effect of Sulfonates as Additives in Cutting Oil for Hobbing(2nd Report)

Influence of Total Base Number

Abstract

In this paper, the effect of total base number (TBN) of calcium (Ca) sulfonates was investigated in terms of tool life (flank wear) and finished surface roughness in hobbing. Experiments were carried out using a fly tool. As a consequence, the following points were clarified: (1) Among the three kinds of Ca sulfonates having different TBN tested, Ca sulfonate at a medium 305TBN is effective concerning the long tool life irrespective of the change in the coating material and in the cutting speed. (2) The Ca sulfonate having 305TBN is suitable for the surface finish, which is the same tendency as that of the tool life.