Isarawit Chaopanich, Somchai Puajindanetr, and Kritdipuk Goyadoolya

pp. 271 - 280

Abstract

The aim of this study was to examine the effect of grinding variables on the circularity error, finished diameter, and
grinding forces of porous polyurethane foam (PPUF). A cube of PPUF having the size of 21 mm was transformed into a round
shape using a vertical wheel grinding with the circular groove pad developed. The grinding speed (Vs) of the wheel was
varied 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. The
abrasive grit size (A) of 20 and 53 µm made of silicon carbide were applied. Two replications of experiment were randomly
performed. Diameter and circularity error of the ground specimen were determined by vision measuring machine. The tangential
and 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.