Large-sized precise direct-driving main shaft structure

Abstract

The invention relates to a large-sized precise direct-driving main shaft structure of a numerical control machine in the technical field of mechanical engineering, which comprises a main shaft structure formed by utilizing a liquid dynamic and static hydraulic technology and an electrical main shaft technology, and a precise direct-driving numerical control machine tool main shaft part which can realize large-sized liquid dynamic and static hydraulic bearings, wherein the precise direct-driving numerical control machine tool main shaft part is internally provided with a motor. The motor is arranged between the front dynamic and static hydraulic bearing and the rear dynamic and static hydraulic bearing; according to the direct-driving structure, the span of the bearings of the main shaft is increased; when the motor drives the main shaft to rotate, due to the external force action of a transmission link, the main shaft only bears the peripheral rotating torque without bearing the radial driving force, is more balanced due to no middle transmission impact during the high-speed operation of the main shaft, and the accuracy of a processed part is higher. The large-sized precise direct-driving main shaft structure has the advantages of high accuracy, large rigidity, long service life, good shock absorption property and vibration resistance, and excellent work stability and reliability, and can be used for the main shafts of precise processing machinery and the main shafts of high-speed and high-precise equipment.

Description

technical field [0001] The invention relates to a large-scale high-precision direct-drive spindle structure of a numerically controlled machine tool in the technical field of mechanical engineering. Background technique [0002] CNC machine tools are the mainstream products of the machine tool industry. High-speed precision CNC machine tools are one of the technical foundations and development directions of the equipment manufacturing industry, and are a strategic industry of the equipment manufacturing industry. The working performance of high-speed precision CNC machine tools depends first on the performance of high-speed precision spindles. The high-speed precision spindle system has always been one of the three high-tech CNC machine tools. In order to improve the spindle speed and machining accuracy, the built-in electric spindle has become the spindle of CNC machine tools. The best choice for structure. [0003] The key to realize the high-speed and precision electric ...

AI Technical Summary

Problems solved by technology

[0003] The key to realize the high-speed and precision electric spindle is the application of precision bearings. At present, precision angular contact ball bearings and precision cylindrical roller bearings are mainly used in high-speed precision electric spindles. However, compared with dynamic and static pressure bearings, the carrying capacity of these bearings Small, low precision, short service life

Although there are a small number of spindle structures using hydrodynamic and static pressure bearings, gas dynamic and static pressure bearings and magnetic suspension bearings, their specifications are relatively small

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