Енергосилові особливості фрикційої термомеханічної обробки (ФТМО) сталевих виробів та вплив на стан їх поверхневої структури

Abstract. Problem. The article deals with the influence of energy and power characteristics of frictional thermomechanical handling of steel products (FTMH) on the state of their surface. Goal. The goal of this work is to study the relationship between the energy and power parameters of steel FTMР and the strengthening result. Methodology. To achieve this goal, the following tasks were solved: fabrication of samples from 65G steel, preliminary hardening heat treatment of samples, hardening of the working surface of samples using FTMO, measurement of the components of the cutting force arising from FTMO using a dynamometer, analysis of the microstructure and microhardness of each sample, comparison of the microstructure, microhardness, and depth of hardening of the experimental samples, conclusions regarding the relationship between the effectiveness of hardening of samples during processing and the energy and power parameters of FTMH. Results. Changes in the structures and properties of samples made of steel, which is used for products requiring a hard and wearresistant surface under the influence of processing to form surfaces with altered properties, are shown. Originality. Measurements of the machining process at FTMH using a dynamometer were carried out and the circumferential (circular) cutting (machining) force was calculated, which made it possible to construct graphical dependencies that allow characterizing the surface hardening taking into account the thickness of the disk. It is shown that the microhardness of the surface of the prototypes was increased to 1300 kg/mm2, which is equivalent to 13000 MPa. Practical value. Recommendations on the optimal thickness of the hardening disk have been made, taking into account the results obtained. The research results can be used in production and research.