Influence of the Duration of Current Pulses on the Roughness in the Combined Processing of Corrosion Steel 12H18N10T

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 τst = 1 s and the current pulse of reverse polarity duration τre = 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