Aerostatic Rotary Table for Low-Resistance Centering Adjustment
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Solution Overview
Problem
Existing roundness measuring apparatuses face challenges in achieving high damping performance and minimizing sliding resistance during centering adjustments, particularly when dealing with high load-bearing and high-speed rotary tables, due to significant frictional influences from vibration and inertial forces.
Innovation Solution
The implementation of a rotary table design featuring a rotary disk supported by a static pressure air film, with an aerostatic pocket and sliding seals, allows for non-contact rotation and reduced sliding resistance, enhancing geometric motion accuracy and damping performance while minimizing external disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a sliding guide mechanism is used to support the centering table, then the structure is simple and easy to manufacture, but the coefficient of friction is high (0.1 to 0.15) causing significant sliding resistance during centering adjustment
Solution Approach 1:
The patent introduces a sliding mechanism that utilizes an air film (pneumatic lubrication) between the sliding surfaces. Air supply holes are formed in the rotary table body, and an air film is generated to reduce friction during centering adjustment, thereby decreasing sliding resistance while maintaining structural simplicity
Solution Approach 2:
The patent changes the physical state of the interface between sliding surfaces by introducing air pressure. By controlling the air pressure parameter, the friction coefficient is reduced from 0.1-0.15 to a much lower value, enabling smooth centering adjustment without increasing structural complexity
2Force
If a rolling guide mechanism is used to reduce sliding resistance, then the coefficient of friction is low (0.002 to 0.003), but the centering table is easily influenced by driving vibration from the rotation drive mechanism
Solution Approach 1:
The patent uses pneumatic lubrication with an air film to achieve low friction (comparable to rolling guides) while avoiding the vibration sensitivity of rolling elements. The air film acts as a damping medium that isolates the centering table from high-frequency vibrations generated by the rotation drive mechanism
Solution Approach 2:
The air film serves as an intermediary between the sliding surfaces, providing both low friction and vibration damping. This mediator layer decouples the centering table from direct mechanical contact with the rotary table body, thereby reducing vibration transmission while maintaining ease of movement
3Measurement precision
If the position adjustment mechanism is operated to perform centering adjustment, then the centering offset is minimized, but the frictional resistance from the sliding mechanism adds excess load to the adjustment mechanism
Solution Approach 1:
The patent employs pneumatic lubrication to reduce the frictional resistance during centering adjustment. By introducing an air film between sliding surfaces, the required operating force of the position adjustment mechanism is significantly reduced, allowing for precise centering without excessive load on the adjustment mechanism
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables high damping performance and reduced sliding resistance during centering adjustments, maintaining geometric accuracy and stability under high load conditions without adding excess load to the position adjustment mechanism.
Implementation Method 1
a plurality of air nozzles that are arranged on a top surface of the bearing member in an annular shape centered on the rotation axis and forms a static pressure air film between the top surface of the bearing member and a bottom surface of the rotary disk
Implementation Method 2
an aerostatic pocket that is formed between the top surface of the rotary disk and the bottom surface of the slide disk
Data Source
AI summary
A rotary disk rotatable around a vertical rotation axis; a bearing supporting the rotary disk so as to be freely rotatable; a slide disk slidable on a top surface of the rotary disk; a position adjustment bracket that displaces the slide disk along the top surface of the rotary disk; a placement disk that is supported by the slide disk; a plurality of air nozzles that are arranged on a top surface of the stator in an annular shape centered on the rotation axis, and form a static pressure air film between the top surface of the stator and a bottom surface of the rotary disk; an aerostatic pocket formed between the top surface of the rotary disk and a bottom surface of the slide disk; and a communication aperture is formed on the rotary disk and introduces pressure of the static pressure air film into the aerostatic pocket.