Papers by Keyword: Electrochemical Grinding

Abstract: The competitiveness of engineering products in the world market is often determined not only by the quality and operational characteristics of products, but also by the cost saving level and labor intensity of their manufacture. This became especially relevant when a wide range of high-strength and difficult-to-machine construction materials appeared, the processing of which by conventional methods is difficult and ineffective. In recent years, various methods are increasingly used for the shaping of parts made of these materials, the efficiency of which is higher due to the combination of several types of effects on the processing object - combined methods. So, for example, the methods of electrolytic abrasive machining with abrasive disks on a conductive bond have replaced the traditional grinding. One of the particular cases of method implementation is processing with a periodic change in the current pulse direction: direct polarity for electrochemical softening of the processed surface, reverse polarity for restoring the cutting ability of an abrasive tool. Whereanent, the purpose of the work is to establish the effect of dressing current pulses duration on the surface roughness of products made of corrosion-resistant steel of 12H18N10T grade. For laboratory research, a bench was designed and manufactured to simulate the conditions of combined processing. It has been experimentally proved that the smallest roughness value Ra = 0.26 μm is observed at the following values of the current pulse duration: the current pulse of direct polarity duration τ_st = 1 s and the current pulse of reverse polarity duration τ_re = 1 s. This allows us to recommend the indicated values in order to ensure high quality of processed surfaces of products made of corrosion-resistant steel 12H18N10T of grade

Abstract: The electro discharge machining (EDM) process is widely applied to produces surfaces of difficult-to-machine materials that require some form of grinding or finishing operation. This is conducted so as to improve the surface texture and appearance of the component’s surface. However, it is also desirable to remove the white uppermost recast layer or damaged surface layer (produced by the EDM process) in order to improve the functional performance of the surface. The finishing of the surface by traditional manual methods, especially in the operation of small and long internal cylinder surface, is both tedious and time-consuming. A novel electrically conductive diamond mounted point electrochemical grinding (DMP-ECG) process is being developed for hard passive alloys unclosed internal cylinder surface grinding. The process mechanism of DMP-ECG is introduced; the influence parameters of the surface roughness, machining accuracy, and diamond tool wear are investigated experimentally for nickel-based super alloys materials. An application of the DMP-ECG to aircraft engine component is verified in term of the optimized process parameters.