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JIN Baidong
ZHAO Wansheng
WANG Zhenlong
CAO Guohui
School of Mechanical Engineering,
Harbin Institute of Technology,
Harbin 150001, China
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MICRO ELECTRICAL DISCHARGE
MACHINING DEPOSITION IN AIR*
Abstract:
A new deposition method is described using micro electrical discharge machining (EDM) to deposit tool electrode material on workpiece in air. The basic principles of micro electrical discharge deposition (EDD) are analyzed and the realized conditions are predicted. With an ordinary EDM shaping machine, brass as the electrode, high-speed steel as the workpiece, a lot of experiments are carried out on micro EDD systematically and thoroughly. The effects of major processing parameters, such as the discharge current, discharge duration, pulse interval and working medium, are obtained. As a result, a micro cylinder with 0.19 mm in diameter and 7.35 mm in height is deposited. By exchanging the polarities of the electrode and workpiece the micro cylinder can be removed selec-tively. So the reversible machining of deposition and removal is achieved, which breaks through the constraint of traditional EDM. Measurements show that the deposited material is compact and close to workpiece base, whose components depend on the tool electrode material.
Key words:
Electrical discharge machining (EDM) Electrical discharge deposition (EDD) Reversible machining Processing parameters
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