D. V. Ardashev

Group abrasive machining in flexible production

The need to design grinding operations on the basis of comprehensive description of grinding-wheel performance is established. The design of grinding operations on the basis of group technology is discussed.

Predicting the performance of abrasive tools in process design for diversified production

Diversified production requires efficient utilization of abrasive tools. To this end, prediction of grinding-wheel performance is expedient. Such prediction may be based on the wear and wear rate of the abrasive tools in specific conditions. Coefficients taking account of different wear mechanisms of abrasive grains are proposed.

Two-parameter assessment of grinding-wheel performance

The stochastic interaction of a grinding wheel with the machined surface is considered. A method is proposed for taking account of the stochastic aspects of the process in compiling the operational ratings of the grinding wheel.

SPH modeling of chip formation in cutting unidirectional fiber-reinforced composite

The machining of composites is of great interest in manufacturing today. To that end, it is necessary to calculate the cutting forces required and to predict the surface quality obtained. In the present work, the cutting zone of a unidirectional fiber-reinforced composite is simulated by the SPH method. The calculation results—specifically, the equivalent stress and the strain distribution—are compared with results obtained previously by the finite-element method and also with experimental data. The good agreement with experimental data indicates that the SPH method may expediently be used in simulating the cutting of composites.

Diagnostics of grinding by modal analysis

It is important to investigate the grinding process in developing methods of assessing the results of grinding operation and the tool quality and also in approximate assessment of the wheel life. A method of indirect assessment of the grinding process is proposed, on the basis of vibrational diagnostics and modal analysis. In grinding, the general spectrum of the amplitude-frequency characteristic includes a new frequency range associated with the grinding conditions and also with the blunting of the wheel.

Predicting the working life of abrasive grains

A method is proposed for determining the life of an abrasive grain on the basis of its internal stress in grinding. The mechanical interaction of a single abrasive grain with the blank is simulated. Conversion from the stress state of the grain to the mass of abrasive removed by various wear mechanisms provides the basis for a group grinding technology, in which efficient machining equipment and conditions are established by predicting wheel performance.

Algorithmic model of the continuum design of grinding

An algorithmic model is proposed for the design of grinding operations in multiproduct manufacturing. This continuum model is based on prediction of the performance of abrasive tools and improves their effectiveness in a wide range of conditions. That improves the overall efficiency of abrasive machining and hence the competitiveness of the manufacturing enterprise.

Recursive model of the blunting of an abrasive grain

An algorithmic model is proposed for calculating the blunting area of an abrasive grain in grinding. The model permits prediction of the blunting of an abrasive tool in a broad range of operating conditions. It is recursive: the nonlinear feedback with respect to the blunting area itself is taken into account. The model permits prediction of the performance of abrasive tools in different conditions. That is especially important in manufacturing today.

Predicting the physicochemical wear of an abrasive grain in grinding

Physicochemical wear in grinding is due to the intense interaction of the abrasive and the blank. A system of chemical-affinity coefficients is proposed for abrasive and machined materials, characterizing the intensity of the physicochemical processes in the contact zone.

Variative designing of grinding operations

A new method is proposed for the design of grinding operations—that is, the selection of tool characteristics and machining conditions. In this approach, tool performance is predicted, and combinations of wheel characteristics and grinding conditions are selected on that basis, with simultaneous satisfaction of all the constraints on the grinding operations and the specifications in the drawing of the part. By variant design of the grinding operations, the tool best suited to specific grinding conditions may be identified during preproduction.