Research on the Machining of Electro-Chemical Grinding by Using a Spiral-Fluted Electrode

摘要

Many practical applications require components to be made of carbide in order to improve their wear behaviour. While the materials cannot be processed efficiently and economically by means of traditional technologies and are therefore rarely used. A new technology applying a specially-designed spiral-fluted cathode in ECG (Electro-chemical grinding) is introduced. In this study, the inner surfaces of small carbide drill bush were ground using this method. The effect of 'screw pump' caused by spiral electrode increases the machining stability over conventional electrode. The laws of the influence of some operating parameters of ECG on the surface quality and productivity are studied by lots of experiments. Experiments results showed that with the use of this technology, the surface roughness and precision of the workpiece improved significantly when compared to conventional grinding by applying spiral-fluted electrode in ECG. It is also showed that the inner surface of the carbide bush was finished easily by this method with the optimal operating parameters, at the same time, the surface roughness of a machined hole is improved to less than 0.4μm R_a, and the dimensional accuracy of hole can be controlled into 0.02 mm. In addition, the grinding process was found to be stable.