MODELING THE IMPACT OF DEFECTS IN FERROMAGNETIC PRODUCTS ON THE QUALITY OF PROCESSING IN FINISHING OPERATIONS

Abstract

To ensure the quality of processed surfaces, it is necessary, based on the functional relationships between the physical and mechanical properties of materials and parameters during finishing operations, to select machining conditions and tool characteristics such that the current grinding temperature values T (x, y, τ), thermal flux q (y, τ), maximum stresses σp max, grinding forces PY, PZ, and intensity coefficient K1 (S, α, σmax) do not exceed their specific values. These values should consider defects of certain geometric dimensions located in the surface layer, having an inherited nature, thus ensuring the required quality of the product’s working surfaces. This study addresses the mathematical formulation of the problem of detecting defects in ferromagnetic components resulting from previous operations during their magnetization. Mathematical expressions were derived to assess the geometric shape and depth of defect placement within the surface of a component based on measurements of magnetic induction distribution on its surface. The mechanism of technological crack formation during finishing operations on surfaces of ferro ceramic materials is considered from the viewpoint of the “weakest link” hypothesis, defined as an inherited defect whose size serves as a criterion for defect-free processing. Analytical conditions for preventing structural defects from developing into main cracks were established. These conditions depend on fracture toughness, physical and mechanical characteristics, and the contact temperature TK during processing, determined by operational parameters. As a result of the research informational support was developed for technological capabilities to achieve defect-free processing of products made from materials prone to cracking.This support involves establishing calculation dependencies to determine the influence of inherited defects formed during previous operations on the crack resistance of the surface layer during finishing operations. It includes technological processing conditions that account for accumulated damages and inhomogeneities in the surface layer of parts made from materials and alloys particularly susceptible to crack formation. This development holds significant economic importance by reducing defects in finishing operations and enhancing the operational properties of machine parts.