Vol 36, No 3 (2016)

The thermal fields in a workpiece ground by a face tool with discrete abrasive segments are simulated by means of Cosmos Works CAE software. The temperature is considerably reduced in grinding by abrasive segments with longitudinal slots in the base and peripheral planes.

A new method is proposed for calculating the life of structural components in random loading processes, when the number of extrema greatly exceeds the number of zero values.

Various drives with harmonic gear systems and generators of internal and external deformation waves are considered. A method of designing harmonic gear systems on the basis of dialog-based interactive software is outlined. A systems approach to the design of electromechanical servo-system drives improves the design quality and reduces the design time.

A system for investigating the properties of axial lobed hybrid bearings with gas lubrication is considered. Experimental results are presented.

The hardening of 4X5MΦC die steel by a powerful fiber laser is considered. It is found that the hardness of the surface layer after laser treatment is 62–64 HRC and the depth of the hardened layer is 1 mm. Ultrafine structure such as a white layer is formed at the surface.

Optimal conditions for the hardening of low-rigidity shafts are determined. Appropriate centrifugal rollers are presented. Formulas are derived for the rolling parameters.

Trends in the development of industrial machines and corresponding design methods are considered. The problems to be solved in the design of traditional and innovative machine tools are discussed. Approaches to meeting the operational requirements on industrial machines are outlined.

A model of the tool system for the high-speed milling of high-technology components is developed. The influence of the dimensions of the system components on the roughness of the machined surface is studied. The formulas obtained permit assessment of the milling productivity for the dimensional parameters of the tool system and the roughness, specified for a specific technological process.

The development of new shaping technologies for pipe blanks requires simulation of the stress and strain fields, which permits assessment of the limiting stress and strain values. The stress–strain state of a pipe blank in expansion (including nonuniform expansion) is analyzed in the present work. Joint solution of the equilibrium equations and plasticity condition is employed here; that is the traditional approach. Analytical dependences of the stress in the wall of the pipe blank on the technological parameters are obtained; the basic formulas for estimating the strain are also presented. Experiments confirm the results.

Spark plasma sintering is a method of consolidating nanostructured powder materials and also composites and gradient materials in the presence of an electromagnetic field, by means of low-voltage sources of powerful current. The main benefit of spark plasma sintering is that previously impossible structures, properties, and compositions may be produced. The finite-element method is used to analyze the consolidation of samples by spark plasma sintering and by a hybrid method in which spark plasma sintering is combined with hot pressing. Corresponding numerical models are tested.