Nº 1 (139) (2023)
Materials science in mechanical engineering
ON THERMAL CONDUCTIVITY OF NODULAR AND VERMICULAR GRAPHITE CAST IRON WHEN ISOTHERMAL QUENCHING
Resumo
The results of studies of thermal conductivity of nodular and vermicular graphite cast iron in the temperature range of 25-950 C are presented. It was concluded that up to 700 C, the type of metal matrix, in the temperature range 700, has a significant effect on the distribution of the heat flow...950 C the matrix effect becomes insignificant and graphite is actively connected in the process, in particular the inclusion form
Science intensive technologies in mechanical engineering. 2023;(1 (139)):3-8
3-8
KINETIC MODEL OF DESTRUCTION OF ADHESIVE BOUNDING OF POWDER COATING AND METAL HOST MATERIAL
Resumo
Ageing quality kinetic model of adhesive compound of metals, when subjected to loadings by normal fracture method, is viewed. The results of the study of compound parameters effect on the pattern of change in the concentration of adhesive bonds are given. The article presents theoretical prediction of compound parameters for a safe ageing quality mode
Science intensive technologies in mechanical engineering. 2023;(1 (139)):9-19
9-19
Technologies of mechanical processing of workpieces
STUDY CASE OF THE LOAD SHAPING IN THREADED FASTENING TURNS AND TECHNIQUE ANALYSIS OF THE WAYS FOR ENSURING BALANCING LOAD
Resumo
The study case for load shaping in threaded fastening turns through tapping using self-tightening methods and posifeed axial advance on-CNC machines is carried out. The ways for ensuring balancing load in threaded fastening turns for the achievement of their strength is viewed. The specific character of controlling the accuracy of the hole thread using bore gages is taken into account.
Science intensive technologies in mechanical engineering. 2023;(1 (139)):20-23
20-23
24-30
Technologies of electromachining and combined processing
INCREASING WEAR RESISTANCE OF CYLINDRICAL FRICTION PAIRS BY COMBINED PROCESS WORK
Resumo
The authors have developed a combined processing method for obtaining modified surfaces. A theoretical and experimental study of surface undulation is presented. Comparative wear tests have shown the advantages of the proposed technology in comparison with traditional hardening methods - HFC hardening and electromechanical processing
Science intensive technologies in mechanical engineering. 2023;(1 (139)):31-37
31-37
Surface layer quality, contact interaction, friction and wear of machine parts
SHAPE-GENERATING MOVEMENT TRAJECTORY RELATIONSHIP WITH THE LINE EDGE PROFILE IN MILLING OPERATION
Resumo
The article presents examined properties of transformation of milling cutter shape-generating trajectories relative to work into parameters of the microrelief and the shape of the surface being formed in the milling operation. It is proved that geometric characteristics of the cutting tool, technological modes and features of the dynamics of the milling system have an effect on the formation of the surface. It testifies that: it is necessary to take into account independent processes in the chip formation zone unrelated to formability trajectories
Science intensive technologies in mechanical engineering. 2023;(1 (139)):38-42
38-42
TOOL DEGRADATION OF THE ROAD HARROW AND CUTTING EFFICIENCY MODELS
Resumo
Main strategies for mathematical modeling of road harrow static tool wear in operating conditions are viewed in the article. An analysis of the effect of asphalt concrete mechanical properties on the cutting process is carried out, monitoring systems for the condition of road surfaces and the state of the cutting tool are distinguished
Science intensive technologies in mechanical engineering. 2023;(1 (139)):43-48
43-48