Improvement of the Technology for Manufacturing Samples From High-Strength Cast Steel 110G13L for Metallographic research and Testing
Authors:   Central Ukrainian National Technical University, Sisa Oleh , Mirzak Volodymyr ,   Central Ukrainian National Technical University, Pukalov Victor ,   Central Ukrainian National Technical University, Dovzhuk Olexandr ,   Central Ukrainian National Technical University, Tupalenko Denys ,   Central Ukrainian National Technical University
Published: January 2025

Typically, armor cones for mills that crush rock are made of high-strength Hadfield foundry steel grade 110G13L. Since these parts are critical and expensive, square-section core samples are made from each casting from the casting for further research, in order to check for operability.
The production of core samples from cast steel 110G13L is associated with certain technical difficulties. This steel is characterized by its high wear resistance combined with high strength, ductility and impact toughness. That is why this steel can be attributed to materials that are difficult to machine.
Of certain practical interest is the use of electrical discharge machining for the manufacture of samples, which is capable of machining any electrically conductive material regardless of its physical properties. Of the three known methods of electrical discharge machining, the most productive is the method of dimensional machining of metals by electric arc (abbreviated as DMA). When implementing the DMA method, the process is carried out by an electric arc, which burns continuously (without pauses) between the electrode-tool and the electrode-workpiece being machined.
In the processing process, the hydrodynamic mode of the working fluid performs a triple function: it determines the energy state of the arc, determines the geometric state of the electric arc as a tool for dimensional processing of various surfaces and is responsible for the process of intensive removal of erosion products from the arc combustion zone, which provides the prerequisites for stabilizing the surface processing process. However, the process of DMA of square rods, to which samples from 110G13L cast steel belong, was not the object of research, and therefore the effective electrical and hydrodynamic modes and technological characteristics of processing are unknown, which limits its technological capabilities. Therefore, in order to be able to control the process of DMA of square rods, it is necessary to experimentally establish the relationship between the factors determining the processing mode and the initial technological characteristics.
The aim of the research is to build mathematical models of the technological characteristics of the DMA process of square rods made of 110G13L cast steel.
The work obtained mathematical models of the DMA process of these samples, which allow controlling the processing productivity, specific processing productivity, specific electricity consumption, roughness of the processed surface, as well as the lateral interelectrode gap and relative linear wear of the graphite electrode-tool. It is shown that the use of DMA technology of samples, compared with their electric pulse processing, allows increasing the processing productivity by 8-10 times.