Flutter-free electric spindle

Abstract

The invention discloses a flutter-free electric spindle. The flutter-free electric spindle comprises a servo motor and a spindle body, the spindle body and a rotor of the servo motor are integrated, the rotor of the servo motor is arranged in the middle of the spindle, the spindle body is supported and positioned to a stator of the servo motor through a rolling bearing and a magnetic bearing, and the magnetic bearing is provided with a servo control system capable of controlling radial suspension force thereof. Positioning accuracy and rigidity of the spindle body can be adjusted by controlling the suspension force of the magnetic bearing, cutting flutter generated during high-speed cutting is eliminated, and processing efficiency and processing quality of the electric spindle are improved, so that cutting quantity within unit time is increased, and requirements of high-speed cutting technology development and practical application are met.

Description

technical field [0001] The invention relates to a rotating machine, in particular to a vibration-free electric main shaft. Background technique [0002] The electric spindle is a zero-transmission structure that combines the spindle and the motor rotor. It has the advantages of compact structure, light weight, low inertia, low noise and fast response. It also has high speed and high power, which can simplify the design of the machine tool and facilitate the positioning of the spindle. , Electric spindles were first used on grinding machines, and later developed into machining centers. With the development of machine tool technology and high-speed cutting technology and the needs of practical applications, people have put forward higher and higher requirements for the performance of machine tool electric spindles. As the spindle develops in the direction of high speed, high power, high precision, high stiffness, precise orientation and ultra-high speed, its dynamic stability ...

AI Technical Summary

Problems solved by technology

[0002] The electric spindle is a zero-transmission structure that combines the spindle and the motor rotor. It has the advantages of compact structure, light weight, low inertia, low noise and fast response. It also has high speed and high power, which can simplify the design of the machine tool and facilitate the positioning of the spindle. , Electric spindles were first used on grinding machines, and later developed into machining centers. With the development of machine tool technology and high-speed cutting technology and the needs of practical applications, people have put forward higher and higher requirements for the performance of machine tool electric spindles. As the spindle develops in the direction of high speed, high power, high precision, high stiffness, precise orientation and ultra-high speed, its dynamic stability must be guaranteed, especially during heavy-duty and high-efficiency cutting, the limit of processing stability is expressed as whether chatter occurs , the electric spindle of the prior art, its spindle is supported and positioned on the motor stator by rolling bearings, affected by the stiffness of the rolling bearings and the fit clearance, in high-efficiency cutting, the spindle speed limited by self-excited vibration is usually 20000~30000r / min, and the processing quality and processing economy cannot meet the needs of the development and practical application of high-speed cutting technology

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