Qiu Mingbo

Efficient Combined Machining of Electrospark-induced Controllable Combustion and Turning Dressing for TC4

Based on the theory of controllable combustion induced by electrical discharge, a new efficient processing technology, controllable combustion and turning dressing combined machining for TC4, is proposed. First, controllable electrospark-induced combustion occurs between the workpiece and the electrode under the condition of electrical discharge and high-pressure oxygen. Then, a combusted layer and a softening layer are formed on the workpiece, which can be removed by the turning tool. Simultaneously, the turning tool can trim the machined surface. The automatic feed control system of the combustion-inducing electrode and turning tool based on current and cutting force sampling is proposed to provide controllable, stable, and efficient combustion. Experimental results show that the processing method can provide better surface quality and reduce the wear of the electrode and tool. The machining efficiency is 46 times higher than the conventional electrical discharge machining turning and 1.8 times higher than the controllable combustion turning.

The effect of pulse energy on the removal form of silicon crystal in electrical discharge machining

A single-pulse discharge system for semiconductors was designed and produced. Single-pulse discharge experiments with single-crystal silicon were conducted, and the morphology of the electric erosion pit under different discharge energy levels was observed. Three removal forms, namely, heat removal, stress removal, and secondary crushing in electrical discharge machining (EDM) of single-crystal silicon, were discovered, and the mechanisms of semiconductor discharge processing were described. Finally, the role of different removal forms in single-crystal silicon EDM was explained and verified.