BazTech - Yadda

1

Optimization of machining variables in Electric Discharge Machining using stainless steel 317 in full factorial method

Nandhakumar S., Sathish Kumar S., Sakthivelu K.

Mechanics and Mechanical Engineering

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2018

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Vol. 22, nr 1

105--117

EN

Electric Discharge Machining (EDM) is a non-conventional machining process and has a larger extent of application in manufacturing industry due to its accuracy. EDM simply uses electrical spark between the tool and workpiece in presence of dielectric medium to erode the workpiece in controlled manner. Improving the material removal rate and decreasing the tool wear rate (TWR), achieving higher surface finish, reducing machining time and enhancing dimensional accuracy are the major areas of focus in electrical discharge machining (EDM) process of SS 317 grade steel. In this research work effort to reduce the tool wear rate is concentrated by comparing the machining performance of two distinct electrodes namely copper and brass. Each electrode has their unique machining capabilities and the experimental results were compared in-terms of tool wear rate (TWR), Metal Removal Rate (MRR) and Machining Time (TM). Input variables were optimized based on the experimental output responses to achieve optimal level of input variables.

2

The Electrochemical and Radiometric Study of Thiourea Adsorption on Polycrystalline Copper Electrode in Neutral Solution

Łukomska A., Sobkowski J.

Polish Journal of Chemistry

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2007

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Vol. 81, nr 12

2171-2180

EN

Adsorption of thiourea (TU) on a polycrystalline copper electrode from 0.01 M NaClO4 solution has been studied by impedance spectroscopy and radiometric method. differential capacity of copper electrode in 0.01 M NaClO4 solution containing TU of concentrations from 10-6 to 5.10-4 M has been measured. The dependencies of the surface concentration of TU on the electrode potential and the bulk concentration were determined radiometrically. The adsorption of TU on the copper electrode was studied in the range of potentials where no faradaic currents occurred. In this range the process of adsorption is practically reversible with respect to the potential and the bulk concen tration of TU. The experimental data were described by the Langmuir and virial isotherms and the Gibbs energy of adsorption was calculated. In order to show the role of the metal the data of TU adsorption on different electrodes have been compared. The unusual behaviour of TU on Cu electrode in comparison with the urea was commented.

3

Obróbka elektroerozyjna (EDM) węglików spiekanych kształtowanymi impulsami mocy.

Miernikiewicz A.

Mechanik

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1999

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R. 72, nr 2

67-70

PL

Zaprojektowano nowy kształt impulsów mocy oraz opracowano konstrukcję i wykonano generator do ich wytwarzania. Określono wartości wydajności energetycznej i efektywności procesu EDM dla zaprojektowanych impulsów napięcia i naptężenia prądu o nowym kształcie. Przeprowadzono badania procesu EDM węglików spiekanych G40 z zastosowaniem elektrody z miedzi M1E. Uzyskano m.in. pięciokrotny wzrost wydajności energetycznej i efektywności procesu EDM, zmniejszenie zużywania się elektrody miedzianej oraz znaczne zmniejszenie grubości warstwy uszkodzonej. Nowe impulsy mocy zapobiegaja powstawaniu zwarć podczas obróbki.

EN

A new shape of power pulsed and also design features and workmanship of the pulse generator. Power output and EDM process effectiveness for the designed voltage and current pulses of a new shape. Examining the EDM process of sintered carbides G40 with the use of copper electrode M1E.