In the present work, the EDMed surfaces were grinded by abrasive electrochemical process with different machining parameters, namely, machining voltage, table feed rate and electrolyte flow rate. Summarizing the mean features of the results, the following conclusions are drawn. 1. There is a recast white layer formed on the EDMed machined surface. The surfaces are heavily rough because of the debris which are not flashed away completely from the machining zone. The applied current does affect the surface roughness significantly. 2. In the AECG process, at the lower voltages, a strongly attached TiO film was found on the surface which hinders the current flow between the wheel and workpiece. With increasing voltage, this film was broken and anodic dissolution took place. Active metal dissolution starts approximately at 4 V and the MRR increases sharply after this point. 3. The abrasive grains on the wheel have broken due to realised gases and were not flashed away by lower electrolyte flowing caused embedment of abrasives on the surfaces and thus generated poor surfaces. With increasing electrolyte flow rate, assumed local turbulences on the machined surface increased and cleaner surfaces were observed. 4. The effect of abrasive particles on MRR was restricted by high table feed rates. The contact of abrasives on surface decreased with feed rate and surface roughness was improved by eliminating abrasive damages. 5. It is possible to achieve surfaces free from EDM damages by AECG. The surface roughness was improved as 92.19, 3.23 and 1.98% by machining voltage, electrolyte flow rate and table feed rate, respectively.
A comparative study of surface integrity of Ti-6Al-4V alloy machined by EDM and AECG
Journal of Materials Processing Technology ; 190 , 1-3 ; 173-180
2007
8 Seiten, 14 Bilder, 4 Tabellen, 17 Quellen
Aufsatz (Zeitschrift)
Englisch
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