Effect of process parameters on the condition of the wire electrode in WEDM of Ti6Al4V

Conventional machining of titanium alloy Ti6Al4V cause high temperature and rapid wear of tool which makes him hardly suitable for machining by machine cutting. The presented experimental study was carried out on a modern wire EDM Sodick AQ327L. Three types of the wire were used. Investigated were the effects of such input parameters as the pulse width and the time between two pulses on the output parameters such as area cutting efficiency, workpiece surface roughness and wear rate of the electrode. The resulting relationships were determined using the conventional regression analysis and neural networks. The results were checked for goodness of fit

Analysis of the wire electrical discharge machinability of roots of steam turbine blades

This paper presents method for the unconventional machining of the blades of steam turbines. Blade material as steel X12Cr13 was chosen into the investigation. Blade failures in gas turbine engines often lead to loss of all downstream stages and can have a dramatic effect on the availability of the turbine engines.. Conventional machining of the roots of steam turbine blades causes high temperature and rapid wear of tool which makes machining expensive WEDM is currently regarded among the most popular non-conventional machining. WEDM allows treatment of hard, brittle materials and composite, irrespective of their structure (thin-wall components) and mechanical properties. Submitted work is an analysis of potential impact on the received thickness of heat affected zone by appropriate heat treatment of material prior to WEDM. Such action is intended to eliminate or reduce the initiating impact of any microcracks on the formation of surface defects on the turbine blades roots during operation. The aim of the article is to replace the traditional methods of machining the blades roots by WEDM and thus the elimination of problems such as the need to monitor the tool wear. The presented experimental study was carried out on a modern wire EDM Sodick AQ327L. Investigated were the effects of WEDM of X12Cr13 steel as the Heat Affected Zone, the micro-fractures and surface roughness parameters

The method of thermal cutting silicon wafers, in photovoltaics

Opracowanie jest syntetycznym ukazaniem typowych struktur geometrycznych powierzchni (SGP), występujących na krawędziach krzemowych ogniw fotowoltaicznych. Genezą owych struktur jest zastosowany zespół technik oddzielania materiału, w rozpatrywanym przypadku krzemu. Uwagę badań skoncentrowano wokół poszukiwania hipotetycznego wpływu na pracę ogniwa krzemowego, niekonwencjonalnych obróbek krawędzi, zwłaszcza, laserowej. Celem porównania i oceny ukazano także powierzchnie pochodzące od cięcia tradycyjnymi, mechanicznymi metodami. Artykuł zawiera szereg materiału będącego wynikiem badawczej pracy katalogującej typowe SGP krzemu fotowoltaicznego. Powierzchnie te zostały ocenione według klasycznych norm opisu SGP, pomierzono je i obliczono stosowne wskaźniki.The study is synthetic exhibition of the typical surface structures, on edges of silicon photovoltaic cells. Genesis of those lattices are applied technics of the separation the material, in the considered case - silicon. The attention of investigations was concentrated around the search of the hypothetic influence on the work of the silicon cell by unconventional processings of the edge cutting. Surfaces coming from the traditional mechanical cutting methods, were also showed for comparison and opinion. The article contains the sequence of material being the result of the cataloging work, of the typical structures in photovoltaic silicon. These surfaces were estimated according to the classic standards of the description surface, measure and count appropriate coefficients

Physicochemical properties of surface of selected materials after abrasive blasting

Celem prezentowanych wyników badań jest ocena stanu warstwy powierzchniowej stali oraz metali lekkich w kontekście parametrów obróbki strumieniowej. Referat zawiera wyniki pomiarów, takich jak: odporność na korozję, chropowatość i mikrotwardość. Praca przez analizę materiałów prowadzi do oceny właściwości użytkowych wyrobów produkowanych z blach.The aim of presented results of the investigations is the assessment of the state of the surface layer of steels and light metals in the context of the parameters of the blasting. This article contains the results of measurements of resistance to corrosion, roughness and microhardness. This work, through material analysis, leads to the assessment of the performance of sheet metal products