The quality of workpiece surface in rough machining of materials with different hardness values by using segmented grinding wheels produced in Vietnam

Segmented grinding wheels have been developed to increase the grinding ability of abrasive grains in discontinuous machining. The cutting ability of the segmented grinding wheels is evaluated. The discontinuity coefficient η of the working surface of a segmented grinding wheel is defined as a ratio of the total length of spacings between the segments to the total circumference of the wheel. Five newly developed segmented grinding wheels with η = 10.91, 16.37, 18.19, 20.01, and 21.83% and one conventional wheel (η = 0%) were used for grinding unhardened and hardened steels as well as aluminum alloy. The results have shown that a smoother workpiece surface was obtained using segmented grinding wheels with η = 18.19% in machining the unhardened steel and with η = 20.01% in machining the aluminum alloy.