scholarly journals Effect of Distilled Water and Kerosene as Dielectrics on Machining Rate and Surface Morphology of Al-6061 During Electric Discharge Machining

2019 ◽  
Vol 13 (3) ◽  
pp. 162-169 ◽  
Author(s):  
Rubab Arshad ◽  
Shahid Mehmood ◽  
Masood Shah ◽  
Muhammad Imran ◽  
Faisal Qayyum
Keyword(s):  
Surface Morphology ◽  
Electric Discharge ◽  
Distilled Water ◽  
Electric Discharge Machining ◽  
Al 6061 ◽  
Machining Rate

scholarly journals EDM of D2 Steel: Performance Comparison of EDM Die Sinking Electrode Designs

2020 ◽  
Vol 10 (21) ◽  
pp. 7411 ◽  
Author(s):  
Madiha Rafaqat ◽  
Nadeem Ahmad Mufti ◽  
Naveed Ahmed ◽  
Abdulrahman M. Alahmari ◽  
Amjad Hussain
Keyword(s):  
Surface Roughness ◽  
Electric Discharge ◽  
Performance Comparison ◽  
Machining Performance ◽  
Electric Discharge Machining ◽  
Machining Time ◽  
Taper Angle ◽  
Radial Overcut ◽  
Circular Holes ◽  
Machining Rate

Electric discharge machining (EDM) of tool steel (D2 grade) has been performed using different tool designs to produce through-holes. Machining performance has been gauged with reference to machining time, hole taper angle, overcut, and surface roughness. Inaccuracies and slow machining rate are considered as the most common limitations of the electric discharge machining (die-sinking). Traditionally, a cylindrical tool is used to form circular holes through EDM. In this study, the hole formation is carried out by changing the tool design which is the novelty of the research. Two-stage experimentation was performed. The newly designed tools substantially outperformed a traditional cylindrical tool, especially in terms of machining time. The main reason for the better machining results of modified tools is the sparking area that differs from the traditional sparking. Comparing against the performance of a traditional cylindrical tool, the newly designed tools offer a considerable reduction in the machining time, radial overcut, and roughness of the inside surfaces of machined holes, amounting to be approximately 50%, 30.6%, and 38.7%, respectively. The drop in the machining time along with a condensed level of radial overcut and surface roughness can shrink the EDM limitations and make the process relatively faster with low machining inaccuracies.

scholarly journals Improving the Performance of EDM through Relief-Angled Tool Designs

2020 ◽  
Vol 10 (7) ◽  
pp. 2432 ◽  
Author(s):  
Nadeem Ahmad Mufti ◽  
Madiha Rafaqat ◽  
Naveed Ahmed ◽  
Muhammad Qaiser Saleem ◽  
Amjad Hussain ◽  
...  
Keyword(s):  
Tool Wear ◽  
Electric Discharge ◽  
Cutting Tools ◽  
Tool Design ◽  
Electric Discharge Machining ◽  
Machining Time ◽  
Response Characteristics ◽  
Relief Angle ◽  
Machining Rate ◽  
Conventional Tool

Among the family of carbides, tungsten carbide (WC) and its variants have extensive use in numerous applications including cutting tools, dies, and many wear resistant parts. Such applications need machining of WC, which is famously considered as challenging due to high tool wear mainly in traditional machining. Sinking electric discharge machining (EDM) can be considered as a suitable alternate but the low machining rate of EDM, with conventional tool design, poses limitations. In this research, the conventional tool design is modified by providing relief angles to the tool electrodes. The relief-angled tool electrodes are first time introduced in this research to machine through holes. The role of the relief angle during EDM has been investigated in terms of six response characteristics, i.e., machining time, hole taper angle, radial overcut at the hole entrance, radial undercut at the hole exit, longitudinal tool wear, and roughness of inside hole surfaces. The performance of the relief-angled electrodes is found to be significantly better than the performance of conventional cylindrical tool. In addition to improvements in other responses, a 49% reduction in the machining time has been realized by the use of relief-angled electrode indicating a worthwhile contribution in the field of electric discharge machining.

Effect of Different Cleaning and Sterilization Methods on the Surface Morphology of Mini-implants

2017 ◽  
Vol 68 (9) ◽  
pp. 1974-1977
Author(s):  
Silvia Izabella Pop ◽  
Dana Cristina Bratu ◽  
Violeta Valentina Merie ◽  
Mariana Pacurar ◽  
Catalin Petru Simon ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Surface Topography ◽  
Distilled Water ◽  
Mini Implants ◽  
Cleaning Methods ◽  
Sem Analyses

The objective of this study was to analyse morphological and surface topography variations of two types of mini-implants after using different chemical and physical cleaning methods and autoclaved sterilization. One hundred mini-implants from two different manufacturers were used in this study. The mini-implants from each manufacturer were divided in five groups, each consisting of ten samples: G0 new, unused, G1 ultrasonically cleaned, G2 chemically cleaned, G3 sandblasted, G4 cleaned with distilled water. SEM analyses of the mini-implants were performed. Only procedures used in samples from group G2 and G3 removed the tissue remains from the mini-implants surface.

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