COMBINED ELECTRODE-BRUSH TREATMENT OF SURFACES OF PRODUCTS WITH VARIABLE ALLOWANCE

The article considers the possibilities of combined processing with an unprofiled electrode-brush of products with a large unevenness of the initial profile. The coefficient of unevenness was used to estimate the size of the allowance. Methods of obtaining parts with variable allowance, features of their processing are considered. These are parts obtained by casting, welding, stamping, roughing blade and electroerosion treatment. The surfaces of such parts are often characterized by high hardness and wear resistance. To date, there is no universal way to process such parts. Often, such details, after processing, have to be refined with the help of stripping devices or a locksmith method, which increases the processing time and enhances the process. It is of interest to use an unprofiled brush electrode for processing such parts, but for this it was necessary to create an effective processing technology that ensures a stable flow of the process. As a result of theoretical studies and oscillography of the process, the mechanism of the processing process was clarified, which made it possible to clarify the true value of the electrode-brush and more accurately determine its wear. A typical technological process of surface treatment with an uneven allowance was developed. Schemes of surface treatment with variable allowance with adjustment of the amount of the brush electrode clamping by the minimum and maximum allowance values are proposed. Processing modes have been experimentally established. The article presents the practical results of experiments on processed cast iron gratings with different modes.