INVESTIGATION AND EVALUATION OF THE INFLUENCE OF CERTAIN TECHNOLOGICAL FACTORS ON SURFACE ROUGHNESS IN WIRE CUTTING OF HARD ALLOYS

Abstract

The paper presents the results of a study evaluating the influence of several technological factors,
including discharge voltage (U), current intensity (I), and wire feed rate (f), on surface roughness during
the experimental machining of BK6 hard alloy inserts, a carbide group material, using the CHMER CW
420HS wire-cut EDM machine manufactured in Taiwan. The experimental machining parameters were
set as follows: discharge voltage U from 70V to 80V, current intensity I from 1A to 2A, and wire feed rate
f from 6 mm/min to 7 mm/min. The research results indicate that all three factors have a direct
proportional effect on surface roughness, with wire feed rate (f) exhibiting the most significant influence.
These results serve as an important basis for selecting appropriate machining parameters to ensure the
required surface quality.