학술지명 : International Journal of Precision Engineering and Manufacturing
발행국가 : 한국
발표일자 : 2012년 07월
SCI여부 : SCIE
제목 : Water spray electrical discharge drilling of WC-Co to prevent electrolytic corrosion
저자: 송기영, 정도관, 박민수, 주종남
내용: 금형가공에 있어서 초경합금에 전해부식 없이 와이어 방전가공용 스타트 홀을 가공함
In this study, electrical discharge drilling (ED-drilling) with water spray for suppressing electrolytic corrosion was investigated. The water spray is composed of tap water and compressed air. In conventional ED-drilling with tap water, the machining results suffer from electrolytic corrosion resulting in poor accuracy because cobalt, which is the bonding material in WC-Co, is easily dissolved in water. The use of water spray instead of tap water prevented electrolytic corrosion around the machined holes without deterioration in the machining speed. The machining characteristics such as corrosion prevention effects, machining rate and electrode wear were investigated according to water spray conditions such as water flow rate and air flow rate. Using the water spray with air flow rate of 1500 ml/min and water flow rate of 60 ml/min, electrolytic-corrosion-free holes were successfully machined on WC-Co. The new machining method was applied to a die-making process with high accuracy and no corrosion.