A. N. Vasin

Geometric stabilization of bearing races by centerless rolling

The geometric stabilization of bearing races by centerless rolling is studied experimentally, for the outer races of ball bearings.

Waste-free ultrasonic bearing assembly

We know that assembly is more difficult to auto� mate than machining. As a result, assembly is still a laborious operation and does not always ensure the required quality. Until recently, the assembly of ball bearings was a prime example. The previous methods for assembly of ball bearings with a singlegap external race were inefficient; the bearings produced were rejected at rates sometimes exceeding 10%. Accordingly, scientists at Saratov State Technical University and OOO NPP NIM (a producer of non� standard manufacturing components) have developed a wastefree ultrasound technology for ballbearing assembly (1, 2). This technology improves bearing quality and eliminates waste. In the present work, we investigate the assembly of ball bearings with a singlegap external race and pro� pose a corresponding mathematical model. We deter� mine the dependence of the displacement of the inter� nal race during assembly, the forces required to deform the outer race, the bending moments and internal flex� ural stress in different cross sections of the race, and the rejection probability on the geometric parameters of the races and the tool employed in assembly. The formula for the rejection probability reflects the ran� dom distribution of the flexural stress within the exter� nal race. The failure probability of the external race in assembly is

Influence of abrasive-tool overrun on the shape error

The shaping of a part machined by an abrasive tool with overrun is analyzed. Calculation of the overrun associated with minimum shape error—the optimal overrun—is considered.

Efficient hydroabrasive cutting with swirling of the liquid jet

Hydroabrasive cutting may be intensified by swirling of the working jet of suspension. In addition to fatigue failure of the machined material, the swirling activates abrasive cutting.

Influence of residual deformation after abrasive machining and centrifugal finishing on ball-bearing assembly

Experimental data are presented regarding the influence of residual deformation after abrasive machining and centrifugal finishing on ball-bearing assembly.

Deformation of bearing components under an axial load for mechanical stress relaxation

The load distribution among the rollers in thrust–radial bearings is determined. Their deformation under an axial force for mechanical stress relaxation is studied.

Solid lubrication of the raceways in bearings with ultrasonic stress relaxation

Experimental data on the ultrasonic treatment of thrust-bearing raceways are presented. A mathematical model of the process is proposed. Graphs show the influence of each factor.

Grinding the roller channels in thrust-bearing races

A method is proposed for ensuring precision of the roller channels in thrust-bearing races. The dependence of the track thickness at the bottom of the channel on the machining parameters is discussed.

Cutting geometry of abrasive grains

The geometry of abrasive grains and their cutting section is considered. This is a very important characteristic of the working surface of abrasive tools.

High-efficiency automated line for precise cold rolling of bearing rings

751 New metalworking methods are essential to rapid progress in Russian manufacturing. An important development in manufacturing is the replacement of cutting processes by pressure treatment of cold metals, such as cold rolling and the profiling of solids of revo� lution (knurling). The history of plastic deformation by rolling extends back over 120 years, and Russian specialists have made significant contributions to its more recent development. Compared to cutting, knurling has the following benefits: considerably reduced metal consumption; improved productivity, precision, and final surface roughness; reduced operating costs (for the cutting tool and other equipment); reduced demand for production space; and reduced costs and amortization. The preci� sion of profile elements produced by rolling matches