High-speed electric main shaft device using sliding bearing and rolling bearing for composite support

Abstract

The invention discloses a high-speed electric main shaft device using a sliding bearing and a rolling bearing for composite support. A motor base seat is used as a shell body. A motor stator and a motor rotor are arranged in the middle of the electric main shaft. A dynamic pressure sliding bearing and a static pressure sliding bearing are respectively used as a front supporting bearing and a back supporting bearing of the electric main shaft. A front ring-shaped water return trough and a back ring-shaped water return trough are respectively formed at two ends of each bearing. Lubrication medium fluid flows into the ring-shaped water return troughs and then flows out of the shell body through a shell water outlet channel. The high-speed electric main shaft device further comprises air sealing devices. Two sides of each dynamic pressure bearing and each static pressure bearing are respectively provided with one of the air sealing devices, and the lubrication medium fluid can be prevented from flowing into a clearance between the motor rotor and the motor stator and flowing out of the shell body along the axial direction of the electric main shaft. A pair of high-speed thrust angle contacting ball bearings is used as thrust bearings and provides high axial stiffness for the electric main shaft, and axial displacement and stability of the electric main shaft are controlled.

Description

technical field [0001] The invention belongs to the field of machine tool equipment manufacturing, and in particular relates to a high-speed electric spindle device supported by composite support of sliding bearings and rolling bearings. Background technique [0002] The high-speed electric spindle is the key to high-speed cutting, and it is usually directly driven by a variable frequency motor. The built-in electric spindle is to directly integrate the motor rotor with the electric spindle. The motor rotor is not only the electric spindle of the machine tool, but the motor seat is the shell of the electric spindle unit, which saves the transmission link and realizes the connection between the motor and the machine tool electric spindle. The "zero transmission" of the traditional transmission method overcomes the shortcomings of the electric spindle system of the traditional transmission method, such as large vibration and noise, additional moment of inertia, and easy slippi...

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Problems solved by technology

[0003] When the speed of the electric spindle rises to a certain level, the friction power consumption of the liquid lubricating film supporting the electric spindle will increase sharply, resulting in a significant decrease in the stiffness and bearing capacity of the lubricating film. At the same time, if the heat generated by the increase in power consumption cannot be taken away in time, It will lead to thermal deformation of the electric spindle and its supporting bearings, which will seriously affect the performance of high-speed machine tools; Significantly decreased

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