Research On Processes Of Wire Cut Electrical Discharge Machining Of Polycrystalline Diamond

Polycrystalline diamond (PCD) composite compact as a developed kind of super-hard materialhas been used widely, because of its super hardness, super abrasive resistance, and excellent thermalcharacteristics. It is difficult to process PCD material by traditional processing methods, so theeffective high-precision processing is still a current research hotspot. Low-speed wire cut electricaldischarge machining (WEDM-LS) is highly praised for its performance in processing speed andeconomic benefits. Therefore, research of WEDM-LS of PCD composite compact has highapplication value and academic value.Three typical PCD composite compacts GE1600, CTH025, CTB010were used as test materials,and were processed by Vollmer QWD760machine. The paper explores the principle betweenelectrical parameters and rough processing speed, and the influence on surface roughness by electricalparameters.Some conclusions can be showed: Open circle voltage, peak current, pulse width has positiverelationship with rough processing speed. Pulse pause time would raise clearance to promoteprocessing speed, but prolong machining time. Electrical parameters could be chosen in a narrow areafor ensuring normal processing status. Lower energy and lower open-circle voltage lead shallowerover-erosion depth. Roughness is decided by material characteristics, wire electrode vibration, andelectrical parameters after finish processing. Bigger diamond grain size would reduce processingspeed, increase surface roughness, and lower processing stability.