V. I. Guzeev

Elastic displacement of a technological system in face milling with tool wear

For an end mill, a two-factor mathematical model is developed for the elastic displacement of the tooth tip in the direction of the machined dimensions. In the model, the mutual angular displacement of the system components is taken into account.

Influence of cutting conditions on the stress at tool’s rear surface

The cutting conditions affect the stress at the rearsurface of the mill tooth. However, we have insufficientinformation regarding the influence of parameterssuch as the supply, cutting speed, and properties of theblank. This deficit may be addressed by simulation ofthe cutting process [1–4].In that approach, we consider the elastoplasticdeformation of the blank, where deformation occurson account of specified displacement of the cuttingwedge [1–6]. In continuum mechanics, this is classified as a plasticitytheory problem with kinematicboundary conditions. We may calculate the stress statein the blank, the extent of th e stress state, and the stressat the front and rear surfaces of the cutting wedge as afunction of its displacement and the strength of theblank. Only the stress at the front surface of the cuttingwedge was considered in [2–4]. In the present work,we turn to simulation of the cutting process in endmilling when wear at the rear surface of the mill toothis taken into account. Displacement of the mill toothis responsible for the stress–strain state of the blank.Thus, the next step is to formulate the simulationproblem for the cutting process in end milling.PLANE CUTTING WITH CONTACT AT THE REAR SURFACEThe calculation scheme for plane cutting is shownin Fig. 1.In cutting, plastic deformation occurs. Therefore,we employ plasticity theory in our solution [1, 2].The stress state of the deformed body and its equilibrium conditions are described by the Beltrami–Mitchell equations of bulk deformation in Cartesiancoordinates [1, 2](1)Δσ

Research stiffness of CNC plunge grinding machine units

The stiffness of the components in a numerically controlled machine tool during inset grinding are considered. The influence of the system’s stiffness on the grinding process is analyzed. The fluctuation in the margin in different machining conditions is determined experimentally.

Designing the plunge-grinding cycle on the basis of the rigidity of the technological system

In a new approach, the plunge-grinding cycle may be designed on the basis of the rigidity of the machine tool’s technological system, determined in tests. Cycles are designed by the proposed method, and an algorithm is formulated for the design of the individual stages within the grinding cycle.

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.

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.

Modal analysis of the dynamic characteristics of a numerically controlled woodworking center

The dynamic characteristics of a numerically controlled woodworking center are experimentally studied. Specifically, the amplitude-frequency characteristics, the resonant frequencies in various directions, the dynamic and static rigidity, the degree of damping of vibrations, and the dynamic coefficient of the woodworking center are subjected to modal analysis. The behavior of the system components is investigated under the action of external excitation and in end milling.