M. A. Volosova

Stress-strain state of a coated nitride-ceramic tool

The influence of coatings on the stress-strain state of nitride-ceramic cutting plates is considered. The thermal and stress state of such plates may be regulated by adjusting the coating properties.

Effect of a TiC Coating on the Stress-Strain State of a Plate of a High-Density Nitride Ceramic Under Nonsteady Thermoelastic Conditions

An original method is presented to obtain relations which describe how the thickness and thermal conductivity of a TiC coating are related to the temperatures, displacements, and stresses in a nitride ceramic plate under nonsteady thermoelastic conditions. It is shown that the stress-strain state of parts made of high-density ceramics can be controlled under such conditions by the application of coatings.

Effect of Titanium Nitride Coating on Stress Structural Inhomogeneity in Oxide-Carbide Ceramic. Part 4. Action of Heat Flow

The effect of a titanium nitride coating on stress structural inhomogeneity in oxide-carbide ceramic under action of heat flow is studied. A considerable effect of a coating on properties determining stress structural inhomogeneity within ceramic is revealed. A requirement is noted for considering stress structural inhomogeneity in designing objects from oxide-carbide ceramic with a coating.

Effect of Titanium Nitride Coating on Stress Structural Inhomogeneity in Oxide-Carbide Ceramic. Part 3. Action of Distributed Force Load

The effect of a titanium nitride coating on stress structural inhomogeneity in oxide-carbide ceramic under action of a distributed force load is studied. The effect of a coating on properties determining stress structural inhomogeneity within ceramic is established. A requirement is noted for considering stress structural inhomogeneity in designing objects from oxide-carbide ceramic with a coating.

Effect of Titanium Nitride Coating on Stress Structural Inhomogeneity in Oxide-Carbide Ceramic. Part 5. A Combined Load Operates1

The effect of a titanium nitride coating on stress structural inhomogeneity in oxide-carbide ceramic under action of a combined load is studied. A considerable effect of a coating on properties determining stress structural inhomogeneity within ceramic is revealed. A requirement is noted for considering stress structural inhomogeneity in designing objects from oxide-carbide ceramic with a coating.

Nitride Ceramic Surface Layer Stressed State Transformation with a Change in TiC-Coating Thickness. Stress – Distributed Force Load Version

As a result of conducting numerical experiments a complex effect is revealed for titanium carbide coating thickness on the change in stressed state of a Si3N4–TiC–Y2O3-ceramic surface layer under action of a distributed force. It is established that an increase in TiC-coating thickness leads to an increase in σi inhomogeneity and an ambiguous change in σ11, σ22, and σ12 inhomogeneity within a nitride ceramic surface layer.

Classification of metal-cutting machines by energy efficiency

Methods of determining the energy efficiency of machine tools are analyzed, including methods based on the input energy balance, the expenditures in machining, and energy losses in the shaping structure of the machine tool. The energy efficiency may be assessed in terms of the energy ratio of the physical processes within the machine tool. On that basis, metal-cutting machines may be classified by energy efficiency.

Nitride Ceramic Surface Layer Stressed State Transformation with a Change in TiC-coating Thickness. Stress Version — Heat Flow

The effect of titanium carbide coating thickness on transformation of the stressed state of a Si3N4–TiC–Y2O3-ceramic surface layer under action of heat flow is studied. It is established as a result of numerical experiments that an increase in TiC coating thickness from 5 to 15 μm, applied to nitride ceramic, leads to a reduction in ceramic temperature, and increase in σ11, σ22, σ12, and σi, and indices of their structural inhomogeneity in a ceramic surface layer.

Transformation of the Stressed State of a Surface Layer of Nitride Ceramic with a Change in TiC-Coating Thickness. Loading Version – Combined Loading

As a result of conducting numerical experiments a favorable effect is revealed for titanium carbide thickness on transformation of the stressed state of a surface layer of Si3N4–TiC–Y2O3-ceramic. It is established that an increase in TiC-coating thickness leads to stable reduction in stresses σ11, σ22, σ12, and σi in a surface layer of the main structural elements.

System of Operation of Ceramic Tools in the External Burnishing of Cylindrical Billets

We develop a procedure aimed at the analysis of the main regularities of external burnishing of cylindrical billets of 40Kh steel with the use of a tool made of Al2O3–TiC ceramics. On the basis of results of experimental investigations, we construct a system of operation of a ceramic burnisher that takes into account the stress-strain state of the ceramics in the zone of contact with the billet.