Numerical studying and experimental investigation: Effect of Reynolds number on performance measures of EDM with high speed flushing
| Autor: | Reza Najati Ilkhchi, Farid Kabirinia, Mohammadreza Shabgard |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0209 industrial biotechnology
Materials science Strategy and Management Numerical analysis Reynolds number chemistry.chemical_element 02 engineering and technology Mechanics Management Science and Operations Research Tungsten 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering symbols.namesake 020901 industrial engineering & automation Electrical discharge machining chemistry Volume (thermodynamics) Heat transfer symbols medicine Flushing Boundary value problem medicine.symptom 0210 nano-technology |
| Zdroj: | Journal of Manufacturing Processes. 48:228-235 |
| ISSN: | 1526-6125 |
| DOI: | 10.1016/j.jmapro.2019.10.035 |
| Popis: | The efficiency of electrical discharge machining is of great importance, especially when dealing with refractory materials such as tungsten. Flushing of the gap has a pronounced impact on this efficiency. In current research, a high-speed flushing system is proposed for flushing the gap between two refractory materials. The effect of this reinforced flushing in form of Reynolds number on material removal rate for a single discharge pulse is studied. Firstly, a mathematical model is introduced to determine the distribution of heat transfer in the tool and the workpiece. Then, the effect of Reynolds number on the boundary conditions of the heat transfer equation, as well as the properties of the tool and the workpiece materials, is calculated and applied. Finally, using the melting points of the materials, the volume of the melt cavity and the amount of material removed from both parts are obtained numerically. To determine the accuracy of numerical analysis results, experimental tests were performed using a tungsten workpiece and a graphite tool with different Reynolds numbers. The results of measuring the EDM performance showed that, with increasing Reynolds number, the EDM performance efficiency increased by up to 44%. Moreover, the amount of tool erosion relative to the amount of material withdrawal from the workpiece is decreased by 5% and 10% for numerical and experimental results respectively. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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