Izvorni znanstveni članak
Analysis of Heat-Affected Zone Depth of Sample Surface at Electrical Discharge Machining with Brass Wire Electrode
L'uboslav STRAKA
orcid.org/0000-0003-0914-2155
; Technical University of Košice, Faculty of Manufacturing Technologies with a Seat in Prešov, Department of Manufacturing Processes Operation, Prešov, Slovak Republic
Ivan ČORNÝ
; Technical University of Košice, Faculty of Manufacturing Technologies with a Seat in Prešov, Department of Manufacturing Processes Operation, Prešov, Slovak Republic
Jana BORŽÍKOVÁ
; Technical University of Košice, Faculty of Manufacturing Technologies with a Seat in Prešov, Department of Informatics, Mathematics and Cybernetics, Prešov, Slovak Republic
Sažetak
The article deals with detailed evaluation of the depth of heat-affected
zone in sub-surface layers of the samples made by technology of wire
electrical discharge machining with brass electrode. It is vital to remark
at the beginning that the heat impact is an undesirable phenomenon from
the standpoint of operating life of parts produced by this progressive
technology. Considerable depth of heat-affected zone, its characteristic,
and its uneven course along cross-section, noticeably contributes to the
decrease of quality and longevity of machine parts, as well as cutting tools.
The samples were produced on electroerosion machine AGIECUT from tool
steel of 950 MPa strength. Applied cutting tool was wire brass electrode of
0,25 mm diameter. To determine suitable HAZ depth measuring method, it
was necessary to take into account properties of the given technology where
impact and consecutive micro-hardness change occurs instantly after high
temperature spot effect of electric discharge channel which arises between
wire electrode (cutting tool) and material (workpiece) during intensive
cooling in dielectric medium. Considering this aspect, the influence
shows different values in longitudinal and lateral cross-sections (as of
wire electrode movement relatively to the workpiece). The course of the
values is in the same time greatly affected by combination of technological
parameters that inevitably must observe electroerosion cutting process itself,
as well as electro-chemical properties of the material. The aim of this paper
is to describe the real course of micro-hardness in particular cross-sections
and to give recommendations concerning adjustment of main technological
parameters so as to achieve HAZ homogenity along the whole cut.
Ključne riječi
Heat affected zone (HAZ); Numerical method; Optimization; Surface roughness; Surface quality; Wire electrical discharge machining (WEDM)
Hrčak ID:
56783
URI
Datum izdavanja:
31.12.2009.
Posjeta: 2.491 *