Investigations of the spark assisted chemical engraving |
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| Institution: | 1. LSR0, EPFL-IPR, CH-1015 Lausanne, Switzerland;2. Delft University of Technology, Advanced Mechatronics, Mekelweg 2, 2628 CD Delft, The Netherlands;3. SB-ISP-UGEC, EPFL,CH-1015 Lausanne, Switzerland;1. Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran;2. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, USA;1. National NC System Engineering Research Center, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA;1. Associated Engineering Research Center of Mechanics & Mechatronic Equipment, Shandong University, Weihai City 264209, PR China;2. Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education of China, School of Mechanical Engineering, Shandong University, Jinan City 250061, PR China |
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| Abstract: | The spark assisted chemical engraving (SACE) of glass has been investigated using current/voltage measurements combined with photographs of the tool electrode under different regimes. Depending on the applied potential, different domains have been identified. At low potentials (<10 V) a cone-shaped region containing finely dispersed hydrogen gas is formed around the tool cathode. At high potentials (>25 V) there are strong current fluctuations mainly due to bubble coalescence. We speculate that in this regime, due to the ohmic heating, the temperature in the vicinity of the tool electrode reaches the boiling point of the electrolyte resulting in the generation of water vapour bubbles. These bubbles cover the active surface area of the tool electrode, leading to blanketing (i.e., isolation between tool and electrolyte). Once the bubbles dislodge from the tool surface, contact between the electrolyte and tool is re-established and the cycle will be repeated. This last region (>25 V) is the working domain of the SACE. Finally some examples of glass machining are given to demonstrate the potential application of this technology. |
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