Analysis of treatment quality in electrical discharge conditions grinding with changing polarity of electrodes

Abstract

Electrical discharge diamond grinding with changing polarity of electrodes allows
processing difficult-to-process materials. The process of forming the treated surface depends, in
addition to the electrical modes of processing, also on the material of the workpiece, the working
fluid, etc. These parameters are not related, so each of them affects the process. Therefore, the
analysis of the quality of processing depending on the electrical modes of processing was
performed using probabilistic-statistical modeling.

The probabilistic-statistical modeling of roughness of a surface of a part in the course of
electroerosive grinding with variable polarity of electrodes was conducted and is presented in the
article. The interrelation between electric modes of processing and indicators of quality of the
processed surface of a part was established. A probabilistic-statistical model of surface roughness of
a part formed by electroerosive grinding was obtained, which establishes the relationship between
the height parameters of the surface and the electrical modes of processing.
The developed model allows calculating height parameters of roughness of a part depending
on electric modes of electroerosive grinding. The height of microroughnesses is determined by the
same processing conditions as the depth of erosion holes. Obtaining low roughness is possible by
reducing the electrical processing modes.
The obtained ratios allow determining directly the probability of contact of the cut chip cut
from the body, formed by the cutting edge of the grain, with the bond surface of the grinding wheel.
When solving the problem of the probability of contacting the set of chips formed by the set of
edges of the grains that are in the working layer of the tool, it is also necessary to use the probability
of depth distribution density.
The type of obtained ratios directly shows that a significant part of the chips formed by the
cutting edges in contact with the rough surface of the workpiece are short and do not come into
contact with the ligament until separation from the body of the workpiece, even without shrinkage.