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1

Increasing of energy efficiency of spindles with fluid bearings

Fedorynenko D., Sapon S., Boyko S., Urlina A.

Acta Mechanica et Automatica

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2017

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Vol. 11, no. 3

204--209

EN

Promising ways of energy efficiency gain of spindles with fluid flow bearings are offered. New design of journal hybrid flow bearing which contains spherical bearing pockets and adjustable valves with relay control system is offered to improve energy efficiency of spindle units of machine tools. To reduce power losses of fluid bearings at high speed special lubrication based on water with integrated system of corrosion protection is offered. Results of theoretical research of energy consumption of grinding machine tool with a new design of spindle hybrid bearings are presented. Power losses of the spindle unit with both new design and base design of journal bearings are assessed. Effectiveness of new design of spindle hybrid bearings at high operating speeds is shown.

2

Accuracy of spindle units with hydrostatic bearings

Fedorynenko D., Sapon S., Boyko S.

Acta Mechanica et Automatica

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2016

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Vol. 10, no. 2

117--124

EN

The work is devoted to the research ofprecision regularities in a spindle unit by the trajectory of the spindle installed on hydrostatic bearings.The mathematical model of trajectories spindle with lumped parameters that allows to define the position of the spindle with regard the simultaneous influence of design parameters, geometrical deviations ofform, temperature deformation bearing surfaces, the random nature of operational parameters and technical loads of hydrostatic bearings has been developed. Based on the results of numerical modeling the influence of shape errors of bearing surface of hydrostatic bearing on the statistical characteristics of the radius vector trajectories of the spindle by varying the values rotational speed of the spindle and oil pressure in front hydrostatic bearing has been developed. The obtained statistical regularities of precision spindle unit have been confirmed experimentally. It has been shown that an effective way to increase the precision of spindle units is to regulate the size of the gap in hydrostatic spindle bearings. The new design of an adjustable hydrostatic bearing, which can improve the accuracy of regulation size gap has been proposed.

3

The search of spatial functions of pressure in adjustable hydrostaticradial bearing

Fedorynenko D., Boyko S., Sapon S.

Acta Mechanica et Automatica

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2015

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Vol. 9, no. 1

23--26

EN

The analysis of spatial functions of pressure considering the geometrical deviations and the elastic deformation of conjugate surace have been considered. The analysis of spatial functions of pressure is performed by the finite element method. The difference of the size of pressure in a tangential direction of a pocket of a support under various service conditions has been investigated. A recommendation for improving of operational characteristics in regulated hydrostatic radial bearing has been developed.