Papers by Keyword: High Frequency Short Pulse

Abstract: Recently, high frequency short pulse electrochemical machining is a focus engineering of national research, its mechanism of research must established in the foundation of correct mathematics model, capacitance model is a ideal model to analysis high frequency short pulse, this article is based on capacitance model, make a detailed formula deduction on the main factors for high frequency short pulse electrochemical machining, eventually, acquired high frequency narrow pulse electrolysis processing gap between poles formula which is based on capacitance model.

Abstract: The machining process produces surfaces that require some form of finishing operation to improve the surface quality. Aiming at the problem of effective finishing for rough surface, the two stages high frequency short pulse electrochemical mechanical finishing (PECMF) technology is proposed. The composition of test equipment and principles of constant pressure regulating in flat and curve surface finishing process are discussed respectively, and the electrochemical finishing device and a series of cathode tools are designed. Systematic process parameters experiment for superalloyGH188 is carried using Taguchi methodology, the technology rule of process parameters on surface roughness is analyzed and a set of optimized process parameters were obtained. The results have shown that the constant pressure PECMP technology can significantly improve the surface roughness to Ra0.2175μm. The interaction effect between electrochemical anodic solution and mechanical polishing is important for improving the surface roughness in high frequency short pulse electrochemical mechanical finishing process.

Abstract: In order to improve machining accuracy and surface quality effectively in ECM (electrochemical machining), a novel pulse inversion power supply has been presented, which has following merits such as high-frequency short pulse, high-power, and compact size. The scheme of full bridge inversion has been selected in this power supply model, and feedback circuit realizes voltage adjusted automatically, and guarantees to stability of voltage. Protect circuit has designed to avoid the problem of workpiece-burn. Finally, a series of electrochemical mechanical polishing tests using the power supply have been carried out, and the results have proved that it helps to achieve well surface quality processed, and improve machining accuracy, and also verify feasibility of its scheme.