Liquid-gas suspension electric main shaft

Abstract

The invention discloses a liquid-gas suspension electric main shaft. The liquid-gas suspension electric main shaft comprises a main shaft, a motor stator, a motor rotor, a box body, a front bearing assembly and a rear bearing assembly, wherein the motor stator is sleeved in the box body; the motor rotor is sleeved on the main shaft; the main shaft is placed into the motor stator and is supported on the box body through the front bearing assembly and the rear bearing assembly; the front bearing assembly is provided with at least one front liquid bearing and at least one front gas bearing; and the front liquid bearing and the front gas bearing are arranged axially. The liquid-gas suspension electric main shaft can meet requirements of high-efficiency processing and high-precision processing at the same time.

Description

technical field [0001] The invention relates to the field of mechanical manufacturing, in particular to a liquid-air suspension electric spindle. Background technique [0002] Machine tool industry is the cornerstone of equipment manufacturing and defense industry. The electric spindle is the core functional part of modern CNC machine tools to achieve precision and ultra-precision machining. It integrates the functions of the machine tool spindle and the motor in structure, with high speed, high precision, wide speed range, fast start and accurate stop, and Realize automatic control. As a high-precision electric spindle, the liquid or gas suspension electric spindle has an error homogenization effect during operation. Compared with the rolling bearing electric spindle and the magnetic suspension electric spindle, it has high rotation accuracy, low wear and long life. It is obtained in precision ultra-precision machine tools widely used. [0003] However, with the rapid de...

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Problems solved by technology

At present, even the most advanced machine tool liquid suspension electric spindle and gas suspension electric spindle system in the world are difficult to meet this requirement. The main reasons are: 1. For a certain spindle system, its dynamic stiffness and rotation accuracy can only be within a certain speed range keep the best

When the speed exceeds this speed range, the dynamic stiffness and rotation accuracy of the spindle system will change, resulting in changes in machining efficiency or machining accuracy

2. If two machine tools are used for processing or one machine tool is equipped with two sets of spindles to focus on high-efficiency processing and high-precision processing respectively, the clamping error and repeated positioning error caused by workpiece re-clamping or spindle replacement often lead to a decrease in processing accuracy , the processing efficiency is reduced

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