Device capable of realizing ultra-high-speed liquid film shearing characteristic and hydrostatic bearing characteristic testing

Abstract

The invention discloses a device capable of realizing ultra-high-speed liquid film shearing characteristic and hydrostatic bearing characteristic testing. The device comprises a motorized spindle anda hydrostatic bearing to be tested; the journal of the hydrostatic bearing to be tested is fixedly installed on the spindle rotor of the motorized spindle; the shell of the motorized spindle is provided with a linear guide rail; a guide rail slider is slidingly arranged on the linear guide rail; the guide rail slider is mounted on the bearing seat of the hydrostatic bearing to be tested; and the bearing bush of the hydrostatic bearing to be tested is arranged in the inner hole of the bearing seat and is fixedly connected with the bearing seat; and the bearing seat is provided with an oil incoming passage and an oil outgoing passage which are communicated with the lubrication passage of the hydrostatic bearing to be tested. According to the device of the invention, the high-speed precisionmotorized spindle is adopted as a high-speed and high-precision rotation reference and power source for the journal, and therefore, the product DmN value of a diameter and a rotational speed can be effectively increased; and the bearing bush, journal and core of the hydrostatic bearing to be tested can be easily replaced, and therefore, repeated assembly accuracy is high, and assembly and debugging efficiency is high.

Description

technical field [0001] The invention relates to hydrostatic bearing test equipment for an ultra-high-speed hydrostatic spindle, in particular to a device capable of testing ultra-high-speed liquid film shear characteristics and hydrostatic bearing characteristics. Background technique [0002] Due to the unique "error averaging effect", the hydrostatic spindle has a much higher rotation accuracy than the rolling bearing type spindle; at the same time, because the liquid medium is incompressible, its load capacity and stiffness are much higher than that of the gas static pressure bearing; therefore, the hydrostatic spindle It has been widely used in high-speed precision machine tools and ultra-precision machine tools that require high rotation accuracy and strong bearing capacity. [0003] Ultra-high-speed hydrostatic spindle (the product of diameter and rotational speed DmN≥1 million mm.rpm) not only has the characteristics of high precision and high rigidity, but also has t...

AI Technical Summary

Problems solved by technology

The obvious disadvantages of this method are: due to the horizontal arrangement of the bearing pads, the size range that can move laterally is limited, and the plane shear rate that can be realized by this device is very small, which cannot meet the test needs of ultra-high-speed liquid film shearing

Its main disadvantages are that the tested bearing seat and the main shaft seat of the rolling bearing are arranged separately, and the installation reference is not uniform. It is easy to cause inaccurate measurement results, and even lead to shaft scraping or shaft holding accidents caused by the friction between the main journal and the bearing bush

In addition, once the bearing shell and shaft core of the tested hydrostatic bearing are installed, it is difficult to replace them. If they are replaced, the workload of readjusting the assembly accuracy is very large, and the work efficiency is very low.

[0007] Due to the immature test methods of the existing ultra-high-speed hydrostatic spindle liquid film shear characteristics and bearing characteristics, the theoretical research and new product development progress of ultra-high-speed hydrostatic spindles are severely restricted, resulting in the development of ultra-high-speed hydrostatic spindles. Failed to be used on a large scale in the engineering field

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