Essay About Lower Cost Of Machine And High Pressure

Performance Characteristics of Dry Edm
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INTRODUCTION
One of the aspects stimulating development of
manufacturing techniques and processes is the
increasing need of accuracy, quality of machining and
quality of surface layer after machining. Very important,
especially recently, factors are also demands on creating
machining methods not harmful for environment. One of
the ways of developing environment friendly EDM was
focused on reduction of amount of hydrocarbon/organic
based dielectric fluids. It was usually performed by
exchanging them with pure, water or low concentration
water solutions. The synthesis of using environmentallyfriendly
dielectrics for EDM was presented by Leao and
Pashby [1]. There are presented advantages and
drawbacks of using hydrocarbon and water based
dielectrics.
Recent investigations in the field of material machining –
mainly cutting processes are aiming at development of
dry or “almost dry”. In these works, researchers are
focused on reduction of coolants volume, by exchanging
them with gases or mixture of gas and coolant.
Resignation of liquids during machining process may
bring many advantages concerning: easier machine
construction (the same lower cost of machine itself),
lower costs of machining and looking forward to the
future, better preparation for stricter low regulations. The
benefits of dry machining processes, described by
Weinert et all [1], presented in the Figure 1.
Figure 1: Benefits of dry machining [1]
Dry EDM is a green environment friendly EDM technique
in which instead of mineral oil based liquid dielectric, gas
at high pressure is used as the dielectric medium. This
method brings advantages in process performance, like
lower tool wear, lower residual thermal stresses and
higher precision.