Effect of Spindle Speed, Feedrate, Tool Geometry, and Polyester & Vinylester Blends on Surface Roughness and Surface Hardness Alteration of the Hole

Abstract

In this study, 2 types of polymers were mixed, namely polyester and vinylester called polyester-vinylester blend (PVB) as the test workpiece. The experiments carried out were testing the surface quality of the hole, namely surface roughness (R_a), and surface hardness alteration (SHA) after drilling. In this study, the effects of spindle speed (n) & feedrate (f), cutting-edge angle (K_r), and PVB composition (P%V%) were tested. The results showed that the factor that most influenced the surface roughness value was the feedrate with a contribution value of 39% and the PVB composition (32%) for PVB dominantly polyester. Whereas in vinylester dominant PVB, the most influential factor is the spindle speed (50%). For the measurement of surface hardness alteration that occurs, the factor that affects surface hardness alteration is the cutting-edge angle (44%) in PVB dominantly of polyester. While in vinylester dominant PVB, the influencing factor is spindle speed (44%).