High-speed electric main shaft device where ultra-precise angular contact ball and cylindrical roller bearings are used

Abstract

The invention discloses a high-speed electric main shaft experimental device supported by an angular contact ball and cylindrical roller bearings. A single column of cylindrical roller bearings with conical holes are arranged at the rear end of a rotating shaft. A first front supporting bearing, a second front supporting bearing, a third front supporting bearing and a fourth front supporting bearing are arranged at the front end of the rotating shaft. The first front supporting bearing and the second front supporting bearing are connected in series to form a group. The third front supporting bearing and the fourth front supporting bearing are connected in series to form a group. The two groups are arranged in a back-to-back manner. A gap between the two groups is supplemented by a shaft shoulder sleeve, and the two groups are separated through a front spring baffle. The first front supporting bearing and the second front supporting bearing are testing bearings. The third front supporting bearing and the fourth front supporting bearing are auxiliary supporting bearings. The actual work environment needed for monitoring and researching a rolling bearing in the high-speed electric main shaft device is achieved, the structure supporting rigidity is good, precise and quantitative lubrication is achieved, the testing bearings can be conveniently replaced, and precision stability of an electric main shaft is guaranteed during long-time running.

Description

technical field [0001] The invention belongs to the technical field of high-speed electric spindles for machine tools, and in particular relates to a high-speed electric spindle device using ultra-precision angular contact balls and cylindrical roller 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 integrates the motor rotor and the electric spindle. The rotor of the motor is also used as the electric spindle of the machine tool, and the motor base is also the shell of the electric spindle unit, thus realizing the "zero transmission" between the motor and the electric spindle of the machine tool. It overcomes the shortcomings of the mechanical electric spindle system with traditional transmission methods such as additional moment of inertia, large vibration and noise, and is easy to slip. Dynamic balance makes it easier for...

AI Technical Summary

Problems solved by technology

First of all, the existing rolling bearing experimental device is mainly for the installation and measurement of a single bearing, and the rolling bearing in the electric spindle is greatly affected by the electric spindle system during operation. For the rolling bearing in the non-working environment and operating conditions None of these researches can reflect the real operating performance of this type of bearing under actual working conditions; secondly, the existing high-speed electric spindle device has the disadvantage of being unable to accurately lubricate a single specific bearing, and it is difficult to disassemble and assemble the test bearing; finally , because the test bearing needs to run at high speed or ultra-high speed, the stability of the existing device for the test environment where the test bearing is located needs to be further strengthened

Images