Air Bubble is Observed and Analyzed in the Pulse Electrochemical Machining

• Main Authors: Chia-Ju Kuan, 官佳儒
• Other Authors: Lih-Wu Hourng
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/07329283745914166881

碩士 === 國立中央大學 === 機械工程研究所 === 90 === In the pulse electrochemical machining (PECM) a regular intermittent power is used to machine the product intermittently. However, the void fraction is the key factor for the product’s quality. In this experiment, a clear acrylic module is used to simulate the fluid field where the sodium chloride solution is chosen as the electrolyte. The pulse frequency, the electric field related parameters and thermal flow field related parameters are controlled to analyze the influence of parameters the void fraction. Results show that the thickness of the boubble which effects the void fraction would decreases as the pulse frequency decreases. On the other hands, the thickness of the bubble increases as the voltage increases, the electrolyte concentration increases or the electrolyte flow speed decreases. Therefore, by fixing the voltage and concentration and well controlling the electrolyte flow speed, a optimal condition between the pulse frequency and the electrolyte flow velocity can be achieved. In turn, the void fraction decreases and the product quality is thus improved effectively.