Dynamic precision adjusting device for electric spindle of high-speed machine tool

Abstract

The invention provides a dynamic precision adjusting device for an electric spindle of a high-speed machine tool. The dynamic precision adjusting device comprises a system sealing device, a hydraulic pre-tightening device, a bearing outer ring rotating device and a shaft system rotation error reducing device. The system sealing device is composed of a plurality of O-shaped sealing rings and lip-shaped sealing rings and used for hydraulic sealing among all components. The hydraulic pre-tightening device is used for bearing pre-tightening and mainly comprises wedge-shaped sealing cavities formed among all components, and a second movable valve floats on the surface of hydraulic oil through the pressure of the hydraulic oil. In addition, according to the hydraulic pre-tightening device, hydraulic oil is introduced into the wedge-shaped sealing cavities opposite in position, the second movable valve is subjected to counter-acting force, so that oil pressure fluctuation is eliminated, and meanwhile a filtering device also reduces the oil pressure fluctuation to a certain degree. The bearing outer ring rotating device is used for adjusting the relative positions of bearing outer rings to prevent the wave crests or wave troughs of the raceway harmonic waves of the bearing outer rings from being in the same axis direction, so that the overall runout of bearing set inner rings is reduced. The shaft system rotation error reducing device is used for reducing the run-out error when the shaft end is stressed.

Description

technical field [0001] The invention relates to the field of high-speed machine tools, in particular to a dynamic precision adjustment device for an electric spindle of a high-speed machine tool. Background technique [0002] As we all know, machine tools are known as industrial mother machines. The processing and assembly accuracy of the machine tool's own parts determines the accuracy of the machined parts. There are many factors that affect the machining accuracy of the machine tool, and the assembly and manufacturing accuracy of the machine tool electric spindle affect the machining accuracy of the machine tool. One of the main reasons; while the rotation accuracy of the electric spindle depends on the rotation accuracy of the bearings used; at present, my country still lags behind Europe, America and Japan in the field of high-end bearings. In recent years, the dynamic rotation accuracy of the high-speed electric spindle produced in my country has been gradually improved...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a dynamic precision adjustment device for the electric spindle of a high-speed machine tool, which solves the technical problem that the runout error of the spindle end is too large when the spindle is rotating, and the working condition of each bearing can be accurately measured.

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