Bulletin PNRPU. Mechanical engineering, materials science

In article it is considered without inertial system of regulation of the radial size in the course of a honing of openings which consists of elastic links. For without inertial system of regulation of the radial size the dynamic analysis was carried out. Behind results which were the transitional characteristic and diagram Bode is received. On the basis of the received characteristics it was defined that in system in the conditions of transient there is no inertial effect. For confirmation of the received theoretical assumptions a series of pilot studies of process of regulation of the radial size with use without inertial system was carried out. As a result of the conducted research it was established that in the course of regulation there is a hysteresis between the characteristic of a gain and falling of a contact pressure at processing. The caused results of a pilot study confirm theoretical assumptions taking into account that the throttling distributor with straight-line characteristics will be used further.

We studied the phase composition and size of the nanopowder particles synthesized using sol-gel techniques technology. Heat treatment conditions were optimized coagulum. Characteristics of spectra of combinational dispersion of light and infra-red spectra of absorption are defined. Studies are the stage of reception functional nanostructured materials.

The influence of technological conditions of hot deformation of low-carbon martensitic steel (LMS) 15Cr2Mn2NiMoVNb on structure formation and properties was investigated. Quenching of LMS can be carried out in air due to high stability of undercooled austenite. Quenching of LMS by cooling with speeds lower than the speed of the air cooling has not been studied previously. This work shows the results of a research dedicated to the effect of different cooling rates during quenching LMS from the end of the hot deformation temperature on structure and properties.

This article analyzes the features of micro-arc oxidation (МАО) process on the sample surface of the aluminum alloy D16. Displaying microarcs behavior on the sample surface when working with adjustable capacitor power supply for AC 50 Hz with high-speed video.

The present article is focused on the study of local flow dynamics and the character of formation of rotary modes of deformation during Equal Channel Multiple Angular Extrusion of workpiece through the U-shaped tapered die. The present local flow problem through the U-shaped tapered die was analyzed with an introduction of physical simulation methods and numerical fluid dynamics simulation techniques. The computational approach has been grounded on the basis of the numerical finite difference solution of boundary value problem for Navier-Stokes equations in the curl transfer form for the local viscous flow of incompressible Newtonian continuum through the U-shaped tapered die. Derived research results allow us to draw a conclusion that the design geometrical implementation of parallel slants within 2-turn U-shaped tapered die provides the localization of maximal tangential stresses within workpiece volume just in the vicinity of these parallel slants during Equal Channel Multiple Angular Extrusion of workpiece through the U-shaped tapered die.

Influence of nonmetallic size in combination with structural constituents in heat-affected zone on impact strength of steel 16Г2АФ is considered. Regression model generating dependence of impact strength on nonmetallic size and martensite percentage on overheating part of this steel is obtained.

The article gives an overview of the key characteristics of the era of nanotechnology, control mechanisms defined process of adaptation of man and nature to nanotechnology. The basic task of this adaptation becomes the formation of ecological culture based on human use of promising new idea of the natural and social sciences.