Wear Characteristics of CBN Resinoid Wheel in Grinding High-carbon High-vanadium Steel

Abstract

This paper describes the experimental analysis on the wear mechanism of CBN (cubic boron nitride) wheel in grinding high-carbon high-vanadium steel. The reciprocating plunge surface grinding tests for 3.2% C-11.4% V steel were carried out by using CBN resinoid wheel, and the parameters which represent the grinding ability of grinding wheel, such as radial grinding wheel wear, specific grinding wheel wear, grinding force, number of cut-ting edges, etc. were measured to know the major factor controlling the wheel wear. Furthermore, the variation of wheel working surface in the grinding process was observed microscopically by using a two stage replica method to grasp the shape of wheel wear. Some results obtained in this paper are summarized as follows : (1) When the coefficient of grain depth of cut ψ_g= (v/V), √t/D does not exceed a critical value ψ_gc= 5.6 × 10^-5, specific grinding wheel wear r_g is proportional to ψ_g^0.32 approximately. However, r_g increases rapidly with ψ_g when ψ_g exceeds ψ_g, (2) When ψ_g does not exceed ψ_gc, average grinding force per a grain cutting edge f_ts is solely a function of ψ_g approximately. From this relation, it was indicated that r_g was proportional to f_ts^0.41 approximately.