The main objective of this research is the analysis of influence of optical and thermo radiating characteristics on the transient (steady state) temperature distributions inside the heat-insulating semitransparent (SHIC) и opaque (HIC) coatings for thermal regulation and control of walls and elements of the combustion chamber (СС) high speed diesel engines. Developed author's methodology of physical and mathematical simulation of parameters of the radiant and heat conductivity transfer was used to calculate optimal balance of optical and thermo radiating characteristics of coatings - as selectively absorbing and scattering materials with different transmittance, reflection and emittance depending on wavelength diapasons of irradiating or radiating heat fluxes. The paper presents a mathematical simulation of optimal balance of improved optical (transmittance, reflectance, absorption coefficients or absorption, scattering indexes) and thermo radiating (emittance coefficient) characteristics. It is considered the effect of the subsurface volumetric heating which at their display promotes decreasing of a surface overheating of coatings of the combustion chamber. It have been received by the numerical method temperature distributions for semitransparent heat-insulating coatings protecting metal substrate (CC wall) with different reflection of penetrating radiation by SHIC layer. It has been shown decreasing the surface temperature of SHIC in comparison with temperature of opaque HIC. The methods of improvement of thermal isolation of the combustion chamber with use heat-insulating coatings c are offered: 1) high volume reflection rλ > 60-80 % for thermal protection (barrier) against intensive radiation of red-hot soot particles of soot (λ ~ 0.7-2 μm) and 2) high surface emittance ελ > 80-90 % (λ >4- 5 μm) for counteraction convectional heat flux inside CС a diesel engine.
The article highlights the problems arising during processing of parts with a complex contoured profile. There are considered all the stages of formation of the geometrical image of the machine with variable elements. The authors formed a complex of 3D-geometric models of Finc Tech SMV-450-H3 milling machining center, which allows to quickly edit the components without changing the overall structure of the model.
The crosscutting strength leads to deformation of the part cross-sectional view while being combined machining of non-rigid smooth hollow cylinder parts. But the deformation magnitude is so small that it can be neglected in further calculations.
In the present-day machine-building creating of high-performance machining processes, subject to the requirements of resources, energy and ecology is one of the most important problems. The part of parameters of the mathematical model remained constant, while others varied. The research result contain arithmetical mean working errors of cross-sections of the part, calculated for ten equidistant points of each cross section, as well as an arithmetic mean and quadratic deviation of error. The subject of research is the technology system of combined cutting-deforming proccessing, because manufacturing application of this method shows its great potential in achieving of high quality and performance.
The process of combined machining by cutting and surface plastic deformation of nonrigid smooth hollow cylinder parts leads to creation of radial, bending and complex twisting oscillations of cross-sectional view of the part blank. These oscillations have an effect on dimension parameters of the combined machining of parts.
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