MICROMACHINING OF A HIGH-DENSITY CURRENT-CONDUCTING
CERAMIC WITH THE USE OF ELECTRICAL-DISCHARGE
MACHINING. PART 2
V. V. Kuzin,
S. Yu. Fedorov,
and Balázs Farkas
Translated from Novye Ogneupory, No. 5, pp. 58 – 62, May, 2016.
Original article submitted April 20, 2016.
Production features of micromachining ceramic workpieces using electrical-discharge machining are studied.
The effect of pulse duration, breakdown voltage, voltage gain factor, peak current strength, and working volt-
age for electrical-discharge machining of VOK71 ceramic workpieces on roughness at the bottom of a channel
and electrode-tool end wear are established. A mechanism is proposed for surface formation with electri-
cal-discharge machining of current-conducting ceramic and recommendations are formulated for improving
micromachining efficiency for components of this material.
Keywords: micromachining, ceramic, electrical-discharge machining, roughness, wear.
A dynamic increase in the requirement for ceramic com-
ponents gives rise to the necessity of finding technology for
their final shaping taking account of a steady increase quality
specifications . Alongside improvement of diamond
grinding, having numerous limitations in preparing ceramic
micro-components, greater attention is devoted to develop-
ing technology for electrical-discharge machining [2 – 9].
Development of electrical-discharge machines with in-
creased precision and productivity, a reduction in elec-
trode-tool wear intensity and development of original shap-
ing schemes for the outer and inner surfaces of components,
significantly expands the possibility and increases the impor-
tance of this technology for preparing ceramic micro-compo-
nents. However, the complexity and stochastic nature of the
erosion effect makes it difficult to develop scientifically
based recommendations for selecting rational electrical-dis-
charge machining regimes.
An attempt was made in  to resolve this problem ap-
plied to electrical-discharge machining of VOK71 work-
pieces. In particular, development of an effect of pulse fre-
quency on machined surface quality and electrode-tool wear.
Research has continued in this work. The aim is to study the
effect of pulse duration, breakdown voltage, voltage gain
factor, peak current strength, and working voltage with elec-
trical-discharge machining of channels in workpieces of
highly dense current-conducting ceramic on channel bottom
roughness and electrode-tool wear.
The basic assumptions of the experimental research pro-
cedure have been given in detail in . Single-factor
planned experiments were used in the present study accord-
ing to which five series of experiments were carried out. In
each series values of a single electrical-discharge machining
regime parameter were measured (working voltage U, break-
down voltage U
, voltage gain k
, pulse duration t
, and peak
current strength I) in a specific range with other parameters
unchanged. Parameters of the electrical-discharge machining
of channels for experiments 1 – 5 are given in Table 1.
Roughness was measured at the bottom of a machined chan-
nel and the amount of electrode-tool end wear was recorded.
The structure and chemical composition of the machined sur
face was were studied by means of a TESCAN VEGA
3LMH electron microscope.
Refractories and Industrial Ceramics Vol. 57, No. 3, September, 2016
1083-4877/16/05703-0283 © 2016 Springer Science+Business Media New York
Part 1 of the article published in Novye Ogneupory No. 3 (2016).
Moscow State Technological University Stankin, Moscow, Rus
Budapest University of Technology and Economics, Budapest,