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Experimental investigation of drilling small hole on duplex stainless steel (SS 2205) using EDM

Rajaram S., Rajkumar G., Balasundaram R., Srinivasan D.

Mechanics and Mechanical Engineering

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2019

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Vol. 23, nr 1

98--102

EN

This work investigates drilling of small holes of 3 mm in diameter on duplex stainless steel. Its machinability index is very low (0.66) when compared to other steels; hence, electrical discharge machining is used. The input parameters are current, spark gap, and dielectric pressure. Each input parameter is considered for three levels. Therefore, the total number of experiments is 3 × 3 × 3 = 27. To reduce the number of runs, Taguchi L9 orthogonal array is used, which have the advantage of maximum and minimum trial runs in its design. The output response is metal removal rate (MRR). To find the best operating parameter, the regression model generated using ANOVA is given as input for MATLAB genetic algorithm (GA). The experimental results indicated that models are significant. The test result indicated that the contribution of the current on the MRR is 42.42%, dielectric pressure is 35.36%, and spark gap is 1.93%. From GA, it is observed that among these three factors, lower value of current and dielectric pressure produced the maximum MRR. The SS 2205 has wide variety of applications, such as high pressure components and control valves,which have large number of components attached to it. Hence, performing micro holes on such high hardness alloy is useful.

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Experimental investigation of drilling small hole on duplex stainless steel (SS2205) using EDM

Rajaram S., Rajkumar G., Balasundaram R., Srinivasan D.

Mechanics and Mechanical Engineering

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2018

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Vol. 22, nr 1

285--293

EN

This work investigates drilling of small holes of Ø 3 mm on duplex Stainless Steel. Its machinability index is very low (0.66) as compared to other steels, hence Electrical Discharge Machine is used. The input parameters are Current, Spark Gap & Di electric Pressure. Each input parameter is considered for 3 levels. Therefore total number of experiments is 3x3x3 – 27. To reduce the number of runs, Taguchi L9 orthogonal array is used, which is having advantage of maximum and minimum trial runs in its design. The output response is metal removal rate. To find the best operating parameter, the regression model of ANOVA is given to input of MAT Lab-Genetic Algorithm. The experimental results indicated that models are significant. The test result indicated that the contributions of current is 42.42%, Di electric pressure is 35.36% and Spark gap is 1.93% on metal removal rate. From Genetic Algorithm it is observed among three levels of factors, lower value of current and Di electric pressure produced maximum metal removal rate. The SS 2205 has wide variety of applications such as high pressure components, control valves etc., which are having large number of components to it. Hence performing micro holes on such high hardness alloy is useful.

3

Badania charakterystyk użytkowych obrabiarki elektroerozyjnej BP-95d

Spadło S., Dudek D.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Nauki Techniczne

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2009

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Z. 13

374--379

PL

W artykule przedstawiono wyniki badań wpływu parametrów obróbki elektroerozyjnej (WEDM) na wydajność obróbki. Obróbkę WEDM prowadzono na obrabiarce BP-95d z generatorem elektronicznym. Jako dielektryk stosowano wodę dejonizowaną. Obróbkę realizowano przy różnych wartościach czasu trwania przerwy oraz czasu trwania impulsu. Parametrem zmiennym w badaniach była również temperatura dielektryka. Określano wydajność obróbki. Wykazano, że na przebieg obróbki WEDM wpływa energia wyładowań elektrycznych oraz zmiana temperatury dielektryka. Ze zwiększeniem energii wyładowań zwiększa się wydajność obróbki, która wzrasta również wraz ze spadkiem temperatury dielektryka.

EN

The paper deals with the investigations of influence parameters of electrodischarge machining (WEDM) on the surface microgcometry of machining parts. BP-95 machine with electonic generator type was used to perform WEDM process. Kerosene was used as a dielectric. During EDM process different current of single discharge were utilised. The following parameters were determined: productivity of WEDM process and surface roughness Ra. It was shown that energy (current) of the single discharge influences mainly on the WEDM process running. The higher was energy of the single discharge the higher were the productivity of the process and roughness of the machining surfaces. State of the material surface afterW EDM was estimated on the base of the scanning microscope images. It has been noticed that at the material surface after WEDM small, solid remelted areas occured. Their dimensions are growing up with increasing of the energy of a single discharge. This phenomenon signifficantly influences on the surface roughness parameters.

4

Badania eksperymentalne charakterystyk technologicznych obrabiarek elektroerozyjnych PB-95

Spadło S., Dudek D.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Nauki Techniczne

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2008

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Z. 11

271--278

PL

W artykule przedstawiono wyniki badań wpływu parametrów obróbki elektroerozyjnej (EDM) na strukturę geometryczną powierzchni materiałów obrabianych. Obróbkę EDM prowadzono na obrabiarce BP-95 z generatorem elektronicznym. Jako dielektryk stosowano naftę. Obróbkę realizowano przy różnych wartościach natężenia prądu wyładowań. Określano wydajność obróbki i chropowatość powierzchni. Wykazano, że na przebieg obróbki EDM wpływa głównie energia wyładowań elektrycznych. Ze zwiększeniem energii wyładowań zwiększa się wydajność obróbki, wzrasta także chropowatość powierzchni. Stan powierzchni po obróbce EDM oceniano na podstawie fotografii z elektronowego mikroskopu skaningowego. Stwierdzono, że na powierzchni materiałów po obróbce występują kratery ze śladami nadtopień. Rozmiary ich rosną wraz ze wzrostem energii wyładowań. Fakt ten znacząco wpływa na chropowatość powierzchni po obróbce.

EN

The paper deals with the investigations of influence parameters of electrodischarge machining (EDM) on the surface microgcometry of machining parts. BP-95 machine with electonic generator type was used to perform EDM process. Kerosene was used as a dielectric. During EDM process different current of single discharge were utilised. The following parameters were determined: productivity of EDM process and surface roughness Ra. It was shown that energy (current) of the single discharge influences mainly on the EDM process running. The higher was energy of the single discharge the higher were the productivity of the process and roughness of the machining surfaces. State of the material surface after EDM was estimated on the base of the scanning microscope images. It has been noticed that at the material surface after EDM small, solid remelted areas occured. Their dimensions are growing up with increasing of the energy of a single discharge. This phenomenon signifficantly influences on the surface roughness parameters.