Том 38, № 7 (2018)

A mathematical model is proposed for the connecting rod of a diesel engine as a deformable component of a crank mechanism. VisSim 6.0 software is used for dynamic simulation of the connecting rod. Vibration is observed when the force exerted by the gas pressure is a maximum.

The effectiveness of four water-based machining fluids is studied as a function of their physical properties. Mathematical formulas are derived for optimal selection of machining fluids.

When the end section of helicopter screw blades made of polymer laminate based on glass–carbon fiber and reinforced by titanium foil is drilled, peeling is noted at the entrance to the hole. Such peeling is investigated in the present work. The influence of the cutting speed and supply on the extent of the peeling is established.

A method is proposed for calculating tool-setup parameters in intermittent thread cutting such that tool life is extended.

Aerospace components may be produced from titanium powder by selective laser sintering. The satisfactory operation of such components under standard loads has been confirmed. In this technology, the manufacturing time and the consumption of titanium are decreased.

On account of their improved physicomechanical characteristics, materials with ultrafine-grain and nanocrystalline structure are of great interest in manufacturing and elsewhere. There has been considerable research on methods of producing such materials. The techniques most commonly used to produce three-dimensional ultrafine-grain materials are equal-channel angular pressing; cumulative rolling; intense rolling; and friction with mixing. However, little information is available regarding the influence of the shaping conditions on the structure and properties of three-dimensional ultrafine-grain materials. Accordingly, there is a pressing need to find effective structuring and shaping methods for the manufacture of parts from ultrafine-grain materials with enhanced performance. Analysis of structuring and shaping methods indicates that the production of high-quality parts from three-dimensional ultrafine-grain and nanocrystalline materials calls for the development of processes, equipment, and tools such that the physicomechanical characteristics and structure of the materials formed by intense plastic deformation are retained.

The functional capacities of the Heidenhain and Fanuc CNC systems are analyzed by comparing the control programs used in the machining of housing components [1–5].

An algorithm is outlined for the design of abrasive tools of optimal structure for a specific grinding operation, ensuring maximum productivity and minimum cost. Systems analysis is employed. Mathematical models for the design calculation are presented, and an example is given to illustrate the optimization of grinding tools.

Theoretical principles are outlined for the design of complex cutting inserts in conditions of three-dimensional chip formation. Simulation of the formation and fracture of continuous chip provides the basis for developing a system of complex turning inserts with improved performance. Production experience with the new cutting tool is satisfactory.