An Investigation of Magnetic Field Assisted Electrochemical Micro Drilling

• Main Authors: Sheng-yu Lin, 林聖育
• Other Authors: Biing-hwa Yan
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/04915976044794782023

碩士 === 國立中央大學 === 機械工程研究所 === 99 === The Study discusses the machining properties of magnetic field assisted micro electro-chemical drilling. It includes two major parts. First, the advantages of magnetic field assisted method are confirmed. The results reveal that the Lorentz force is helpful to renew the electrolyte to promote the machining efficiency and accuracy. When the magnet field direction is set perpendicular to the electrical field, the maximal Lorentz force is induced to increasing machining efficiency observably. With magnetic assist, the minimal micro hole with ψ407 μm is processed, even though the tool electrode doesn’t rotate between the working time. Furthermore, when the electrode doesn’t rotate, the straying current corrosion area occurred around the entrance edge will expand. To overcome this problem, a new upward feed machining method is presented. Second, the machining properties of upward feed mode are investigated. The conception of upward feed mode is similar to gas mixed electrochemical machining. Because the reaction bubbles assemble on the workpiece surface like a protection layer, the straying current corrosion area and the hole-enlargement are reduced, and the machining accuracy is increased. In the upward mode, the straying current corrosion is improved effectively, and the annulus width is reduced to minimal 106 μm.