Investigations of spherical grinding parameters on circularity error, finished diameter, and grinding forces for porous polyurethane foam

Abstract

The aim of this study was to examine the effect of grinding variables on the circularity error, finished diameter, andgrinding forces of porous polyurethane foam (PPUF). A cube of PPUF having the size of 21 mm was transformed into a roundshape using a vertical wheel grinding with the circular groove pad developed. The grinding speed (Vs) of the wheel wasvaried between 1.41 and 5.18 m/s. The cross head speed of the circular groove pad (f) was controlled at 1, 3, 5 mm/min. Theabrasive grit size (A) of 20 and 53 μm made of silicon carbide were applied. Two replications of experiment were randomlyperformed. Diameter and circularity error of the ground specimen were determined by vision measuring machine. The tangentialand normal forces of grinding were obtained using a dynamometer. The experimental data were statistically analyzed. The study found that (1) the grinding speed could remarkably affect the circularity error, finished diameter, and grinding forces,(2) the grinding speed ranged between 2.83 and 3.77 m/s could contribute to sphere shape specimens, and (3) the grinding speed of 3.30 m/s, cross head speed of 1 mm/min, and abrasive grit size of 20 μm provided the least circularity error.

Keywords

• circularity error
• grinding forces
• porous polyurethane foam
• spherical grinding