| Summary: | 碩士 === 國立中央大學 === 機械工程學系 === 85 === ABSTRACT Scientific and engineering advances in recent years
have placedunusual demands on the die industry.Along with EDM
developmentshave found as a result of the search foe better,
faster manufacturingmethod to reduce costs and solve the
difficult fabricating problemsposed by the newly die materials.
In many cases as in tools and dies,severe pressure and thermal
loading may be applied . to avoid possiblefailures arising from
the surface defacts it vital that there is an adequate
understanding of the nature and extent of surface damageimparted
under various machining conditions,In EDM process, there isan
important advantage that the machining performance does not
dependon the properties of material such as the strength,
hardness and toughnessBut the material removal rate and surface
roughness are more slower androugher than the turning process.
Therefore one of the important areas in EDM field is how to
promotethe material removal rate and improve the surface
accuracy.Attemptswere made to understand the surface
transformation and damage in SK2die materials after EDM.It is
found that the pulse energy correlates with surface
characteristics,such as surface morphology ,surface roughness,
thickness of damaged layer,microhardness profile,desity of
surface crack.
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