High-speed electric main shaft for mixed use of outer ring of steel bearing and inner ring of ceramic bearing

Abstract

The invention provides a high-speed electric main shaft for mixed use of an outer ring of a steel bearing and an inner ring of a ceramic bearing, and relates to a mechanical component. The high-speed electric main shaft comprises an electric main shaft shell (7), a ceramic rotating shaft of the electric main shaft (1), a bearing inner ring (2) of a mixed material bearing device, a bearing outer ring (3), a motor stator (6), a rotor (5), a cooling device (4), a bearing preloading device (8) and a lubricating device, wherein the bearing inner ring (2) of the bearing device and a bearing ball are made of a ceramic material, a bearing retainer is made of a resin material, and the bearing outer ring (3) is made of a steel material; and the bearings adopt an assembly mode. The invention provides the high-speed electric main shaft for mixed use of the steel bearing outer ring, the ceramic rotating shaft, the ceramic bearing inner ring and the ceramic ball. Zirconium oxide and hot pressed silicon nitride are adopted as materials of the main shaft, the bearing inner ring and the bearing ball so as to reduce the weight of the rotating part of the main shaft, and improve the rotating speed. The bearing outer ring is made of the steel material to reduce the manufacture strength and improve the vibration resistance effect.

Description

Technical field [0001] The invention relates to a mechanical component, in particular to a high-speed electric spindle with a mixed use of a steel bearing outer ring and a ceramic bearing inner ring. Background technique [0002] More and more spindles of modern high-end machine tools begin to use electric spindles. Especially on high-speed processing machine tools, the electric spindle has more advantages because of its easy control and speed adjustment. In CNC machine tools, the requirements for the electric spindle are mainly in the following aspects: 1. The moment of inertia of the rotating parts of the electric spindle is required to be small, which is easy to control during high-speed movement. 2. During high-speed operation, heat will be generated due to mechanical friction and electromagnetic loss. Therefore, on the one hand, the electric spindle must have a good cooling link, and on the other hand, the electric spindle must have a certain degree of heat resistance. 3. ...

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Problems solved by technology

However, since ceramic materials are difficult to machine, especially the groove machining accuracy of the ...

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