DESIGN OF TECHNOLOGICAL POSSIBILITIES ON PROVIDING OF QUALITY DESCRIPTIONS OF SUPERFICIAL LAYER OF CONICAL WARES ON FINISH OPERATIONS
DOI:
https://doi.org/10.32782/KNTU2618-0340/2021.4.1.25Keywords:
конические изделия, модель температурного поля, дефекты, качество поверхностного слоя, финишные операции, адекватностьAbstract
The paper considers a temperature field model that forms in the surface layer of conical products during their processing at finishing operations. These operations are associated with the appearance in the surface layers of defects such as burns, cracks, tensile stresses. Which significantly affects the reliability and durability of these parts during their operation. Being local stress concentrators under operating conditions, these defects lead to premature failure of products, even though the load on them forms stresses, the magnitude of which does not exceed the limiting values. The model is based on the initial boundary thermal conductivity problem for a product in a truncated circular cone. The functional connections of technological parameters with the grinding temperature obtained based on the model reflect the condition of the treated surfaces for conical products and eliminate burns on the treated surfaces of the products through appropriate techniques. The study of the conditions for improving the quality of treated surfaces by eliminating defects such as cracks and scorching was carried out mainly at identifying the relationship of the formed temperature fields with technological parameters, physical and mechanical properties of polished materials, and product geometry. It was found that when grinding conical products from a larger radius to a smaller one, the temperature increased in proportion to the angle of inclination of the treated surface. The adequacy of the constructed model was checked on the example of grinding conical steel products, with known physical and mechanical characteristics, the choice of tool, and the purpose of processing modes. Analysis of the simulation results shows that the temperature of the machined surface increases as the machining tool approaches the conical surface to a smaller diameter. This area of the machined surface of conical products is most prone to defect formation at the finishing operations. Therefore, when assigning modes of processing of such surfaces, they should be assigned on the condition that when approaching the machining tool to a part of a conical surface of smaller diameter, the temperature formed on it should not exceed the allowable values that provide the required quality. Analysis of the numerical calculations of temperature fields showed sufficient accuracy under the boundary conditions of modeling.
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