Compact type hydro-hybrid ceramic main shaft device

Abstract

The invention discloses a compact type hydro-hybrid ceramic main shaft device. On the structural design, the mode of radial middle and thrusting two ends is adopted, simultaneously, the structure that the metal fully includes a ceramic friction pair is adopted, and shape deformation of all ceramic parts can be avoided on design. In the invention, support bearings are taken as ceramic hydro-hybridceramic bearings, and simultaneously have the radial bearing function and axial thrusting function; the ceramic parts are prevented from bearing large tension action, or the condition that the parts are broken due to the overlarge stress of the edges of the parts is prevented, the concentration stress at the inner part of the ceramic parts is reduced, and breakage accidents caused by design flaw of the ceramic parts can be prevented; the lubricating liquid flow is saved as liquid outlet pressure of a radial bearing is taken as the liquid supply pressure of a thrust bearing; the seam of the radial bearing is taken as a choke holder of the thrust bearing, so that the cost of the choke holder is saved; and the radial baring can be tightly combined with the thrust bearing, so that the length is shortened under the condition of unchangeable radial bearing function and axial thrusting function of the main shaft, the structure is more compact and simple and the processing is convenient.

Description

technical field [0001] The invention relates to a mechanical assembly part, in particular to a dynamic and static pressure spindle device. Background technique [0002] CNC machine tools are developing in the direction of ultra-high speed and ultra-precision. As the core component of CNC machine tools, the machine tool spindle determines the performance level of the machine tool. The hydrodynamic and static pressure support method is widely used in the field of high-speed precision machine tools because of its excellent high-speed performance, high vibration damping, high rotation accuracy, high stiffness and small damping. [0003] At present, the main problems of the ordinary liquid dynamic and static piezoelectric spindle are: the temperature rise of the lubricating oil causes the spindle precision error to be too large, and the wear of the friction pair causes the spindle life to be low. The traditional dynamic and static pressure spindle is lubricated by oil. When the ...

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Problems solved by technology

[0005] The present invention aims to solve the problems of high-speed machine tool dynamic and static pressure spindles, such as the temperature rise of oil-lubricated spindles, poor bearing capacity of water-lubricated spindles, and short service life of metal friction pairs. A compact dynamic and static pressure spindle device is provided to ensure the spindle bearing capacity Under the premise of reducing the temperature rise of the spindle liquid film and improving the life of the spindle friction pair

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