Abstract
When the cost of new spare parts has sharply increased, the problems of restoring worn parts are relevant. (Research purpose) The research purpose is to present the most promising technological processes for the restoration of parts of internal combustion engines by the electric spark processing. (Materials and methods) The article presents a description of new generation installations for electric spark processing BIG-5 and their technical characteristics. Tool alloys 65G, SHX15, P6M5, as well as hard alloys and bronzes were used as alloying materials. Conductive materials with high electrical and thermal conductivity, erosion resistance were used to perform the operation of melting the deposited alloying layer. These primarily include copper, tungsten and graphite. (Results and discussion) The article presents developed technological processes and provides a list of details where electric spark processing is successfully used and a detailed description of the technological process of restoring several basic parts, recommends application modes and materials. The main principle of restoring operability is to increase the hardness and bearing capacity of the working surface, as well as the selection of optimal friction pairs. The production tests of technologies confirm 100 percent of the life of the restored parts. The cost of restoration using electric spark processing does not exceed 30-40 percent of the cost of the part. (Conclusions) The examples of restored parts show the effectiveness of the electric spark processing technology, as well as the reduction of labor intensity and cost of work related to the repair and restoration of machines. Electric spark coating is in many ways superior to known technologies in terms of the quality of the resulting surface and labor costs, it is characterized by low energy consumption, simplicity, high utilization of electrode material and environmental friendliness of the process.
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