학술지명 : Journal of Micromechanics and Microengineering
발행국가 : 영국
발표일자 : 2010년 3월
SCI여부 : SCI
제목 : Micro electrical discharge milling of WC-Co using a deionized water spray and a bipolar pulse (초경합금의 스프레이 방전 밀링)
저자: 송기영, 정도관, 박민수, 주종남
내용 : 전해부식에 취약한 초경합금을 방전밀링을 이용하여 가공할 때 스프레이 방식을 도입하여 가공성능을 향상시켰음
Micro electrical discharge milling (ED-milling) is an effective machining process for manufacturing micro structures on hard metals. This method of machining generally uses kerosene or deionized water as the working fluid, both of which are associated with some problems. Kerosene results in considerable electrode wear and deionized water causes electrolytic corrosion in workpieces. In particular, when cemented tungsten carbide (WC-Co), which has superior strength, hardness and wear resistance, is machined by electrical discharge machining (EDM), the problem of electrolytic corrosion arises as a matter of course since the material is very susceptible to electrolyzation. In this study, spray ED-milling with a bipolar pulsed power source and deionized water was conducted to solve the above problems. This method uses a water spray, which is a mixture of compressed air and deionized water. The spray is injected into the machining gap between the electrode and the workpiece. WC-Co was used for the workpiece and micro grooves were machined on the workpiece. As a result, using the spray ED-milling method, high-quality micro grooves were manufactured on the WC-Co workpiece with no electrolytic corrosion and almost-zero electrode wear.