Effects of Grinding Conditions on the Performance of Grinding Wheels (3 rd Report)

Abstract

Cutting edges mean not always abrasive grains that are supported by bond but there are many types of cutting edges, such as grains coated with bond and bonding bridges acting as cutting edges and so on, because grinding wheels are constituted of abrasive grains and bond material.
As cutting abilities of bond material are far inferior than that of abrasive grains, the more bond material acting as cutting edges exist, the poorer cutting abilities of grinding wheels become.
The virtue of grade on the performance of grinding wheels owe not only the bonding forces that have influence upon the shapes and the distributions of cutting edges but also amount of bond material acting as cutting edges.
In this report, some discriminating methods between bond material acting as cutting edges and abrasive grains are described, and the behaviors of the former in grinding process, such as wear and distributions are studied through microscopic observations.
The results are as follow;
(1) for the discernment of cutting edges whether they are abrasive grains or bond material, difference of streaks pattern on the worn surface of cutting edges are utilized most effectively,
(2) bond material acting as cutting edges increase as harder the grade of wheels, and about vitrified wheels of A 46, from 25 to 40 per cent of cutting edges of all are occupied by bond material.