Volume 39, Nº 5 (2019)

The properties of a hybrid power unit in which a mechanical transmission rigidly connects the internal combustion engine to the driving wheels are considered. In this transmission, the torque created by the parallel electric field is summed with the torque generated by the engine in the event of overloading. The control algorithms developed for the electric power prevent its opposition to the mechanical power under any circumstances.

A control method is proposed for bulk milling on CNC machines. A method is described for determining the supply corresponding to specified machining accuracy.

A system is proposed for the simulation and testing of end rollers of different designs used in gravitational pallet conveyers and racks. The dependence of the steady pallet speed on the mass of the control load is determined.

To decrease the metal content in the housings of solid-fuel rocket engines, the metallic joint reinforcement may be replaced by plastic components. A device for the production of reinforcement blanks by winding is developed. This system ensures polymerization and machining of the plastic.

The influence of the cutting conditions on the life of quadrilateral cutting heads in the rough cutting of conical gears with circular teeth is investigated experimentally.

The requirements on product quality at all stages of the life cycle are analyzed. The characteristics on which requirements are imposed are noted. Common characteristics present at all stages of the life cycle are identified. It is found that the requirements on the common characteristics at different stages of the life cycle may be inconsistent. These requirements may effectively be reconciled if the requirements on the characteristics established at the operational stage are lowered.

It is expedient to use an adhesive coating with insular structure to bind diamonds in tools. The vacancies in the defective sections of the diamond surface are saturated with metal atoms. The reliability of diamond retention may be assessed by applying cyclic dynamic loads to simulate the forces on the diamond in tool operation. The influence of a titanium–nickel coating on the diamond retention and the wear resistance of the diamond tool is investigated.

The evolution of the dynamic cutting system is simulated with different trajectories of the power of irreversible transformations in performing work. The evolutionary changes associated with change in tool wear and in surface precision and quality depend on the dynamic properties, on the subsystems that interact through cutting, and also on the initial dynamic relationship formed by the process.

The influence of cutting (milling) on the surface roughness and undulation of AMg2 aluminum alloy with regular and ultrafine grain structure is considered. In the machining of materials with ultrafine grain structure, the surface quality is better than for materials with regular grain structure.