Research on Formation of Microgeometry of Work Surface of Grinding Wheel

Abstract

As a grinding wheel rotates, every grain acquires a certain trajectory of movement, sequence, and duration of contact with a machined part. The grains can be divided into four groups: working, contacting, screened, and non-operational ones. The main characteristics of formation of the microrelief of the wheel work surface depend on the law of difference in altitude of cutting edges and corner radiuses of their tops. The studies on the kinematics of interaction between a grinding wheel and a machined surface during face grinding showed that overlapping of scratches across the width occurs at a smaller depth. The cutting depth of a grinding wheel does not depend on the value of longitudinal and cross feed, but it is determined by the law of grain distribution in the volume of abrasive layer as well as the shape of the tops of abrasive grains. It is established that abrasive grains, located in the work surface layer to the cutting depth, are in the most unfavorable conditions due to their small amount and highest difference in altitude. It leads to an increase in the size of the chip, occurrence of the highest cutting forces, and wear of grains.