Том 37, № 1 (2017)

An approach to improving physical modeling is proposed, for the example of liquid evaporation. The basic criteria that are adopted in improving physical modeling are considered, and the effectiveness of the proposed method is assessed.

The operational reliability of eccentric free-wheel mechanisms (of both frictional and nonfrictional types) in a pulsed variable-speed drive is studied by calculation and experiment. The grades of steel ensuring the longest life of such mechanisms in pulsed loading are determined.

A new crank–rod mechanism is proposed for internal combustion engines. This system improves the engine efficiency by generating maximum torque at maximum gas pressure in minimum combustion-chamber volume.

Formulas are derived for the life of magnetic-fluid frictional components as a function of the limiting solid-phase concentration.

Results are derived regarding the influence of hard-alloy tool production by impact molding and high-temperature sintering on the dislocation density in tungsten-carbide and titanium-carbide powder.

The principles of two-sided laser shock processing (LSP) are considered. The differences between two-sided and one-sided laser shock processing are noted. For the example of a thin VT-6 titanium-alloy plate, finite-element modeling is used to investigate the residual stress field when using two-sided LSP. The distribution of surface microhardness is analyzed.

Means of faster and better technological preparation for multiproduct manufacturing are considered. The possibility of technological preparation in parallel with design and organizational preparation is demonstrated. An approach to organizational and technological design in the development of manufacturing processes is proposed. In this approach, the dynamics and goals of production systems are taken into account. A timeline for the introduction of the proposed approach is outlined, and the conditions for its successful implementation are specified.

The development of computer models for flexible machining systems is considered. The proposed approach permits detailed modeling at the level of each technological operation. It takes account of the influence of the parameters of the technological processes and equipment, the interaction algorithms, and the dispatch rules. This approach may be employed in the development of methods for the creation of flexible production systems, in system design and operation, and in the study of manufacturing equipment.

A system for use in a metal-cutting band saw extends tool life, reduces operational noise and vibration, and improves the cutting precision and productivity.

Means of more effective cutting are considered. The cutting temperature is simulated in the presence of indeterminacy by means of an artificial neural network.

The influence of the assembly conditions on the rotary drag torque and static load capacity of thrust ball bearings is studied experimentally. It is found that the ball parameters and the ratio of the ball radius and the raceway radius affect the drag torque and static load capacity of the bearings. Optimal bearing geometry is established.