Rotary Table Air Bearing With Variable Exhaust for Load Stability
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Solution Overview
Problem
Existing rotary table apparatuses with vacuum preload systems face challenges in supporting higher loads due to the narrowing of the air film region, which reduces the maximum load that can be supported effectively.
Innovation Solution
A rotary table apparatus with an air film forming system that includes a guide surface, air supply and suction holes, and a discharge part with an opening adjusting mechanism to adjust the discharge port area based on the applied load, enhancing the stiffness and stability of the air film across a wide range of loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a vacuum preload system is used to ensure air film stiffness, then the air film stiffness is improved, but the region for supporting load is narrowed
Solution Approach 1:
The bearing surface is divided into two distinct regions: a vacuum preload region with suction holes for generating negative pressure to ensure air film stiffness, and a load support region without suction holes for providing sufficient area to support applied loads. This segmentation allows both regions to perform their specific functions optimally without interfering with each other.
Solution Approach 2:
Different regions of the bearing surface are given different properties: the vacuum preload region has suction holes created through the guide surface to generate negative pressure, while the load support region maintains a continuous air film without suction holes. This local differentiation enables the system to simultaneously achieve high stiffness and adequate load support capacity.
2Force
If the discharge port area is increased to support higher loads, then the load capacity is improved, but the air film stability deteriorates
Solution Approach 1:
The discharge port area is made variable rather than fixed, allowing it to be dynamically adjusted based on operating conditions. The opening adjusting part changes the discharge port area in response to load variations, maintaining optimal air film stability across a wide range of loads by preventing excessive pressure buildup that would occur with a fixed large discharge port.
Solution Approach 2:
The system dynamically changes the physical parameter of discharge port area to adapt to varying load conditions. By adjusting this geometric parameter, the system maintains stable air film operation whether supporting light or heavy loads, avoiding the trade-off between load capacity and stability that would exist with a fixed discharge port size.
3Stability of the object's composition
If the discharge port area is decreased to maintain air film stability, then the air film stability is improved, but the maximum load capacity is reduced
Solution Approach 1:
The discharge port area is made variable rather than fixed, allowing it to be dynamically adjusted based on operating conditions. The opening adjusting part changes the discharge port area in response to load variations, maintaining optimal air film stability across a wide range of loads by preventing excessive pressure buildup that would occur with a fixed large discharge port.
Solution Approach 2:
The system periodically or continuously adjusts the discharge port area based on feedback from pressure sensors or load detectors, enabling it to respond to changing operating conditions and maintain both stability and capacity across varying load scenarios.
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
The solution effectively supports a wide range of loads by maintaining air film stability and increasing the maximum load capacity, as demonstrated by experimental results showing improved stiffness and load-bearing characteristics compared to conventional systems.
Implementation Method 1
an air film forming part that forms an air film by supplying compressed air between the guide surface and the opposing surface
Implementation Method 2
a negative pressure generating part that generates a passing negative pressure by increasing flow velocity of passing compressed air to suck air between the guide surface and the opposing surface
Data Source
AI summary
A rotary table apparatus includes: a table part having a placement surface; a support part having a guide surface facing an opposing surface which is on an opposite side of the placement surface of the table part; an air film forming part that forms an air film by supplying compressed air between the guide surface and the opposing surface; a negative pressure generating part that sucks air between the guide surface and the opposing surface; a discharge part formed with a discharge port; and an opening adjusting part that adjust the size of an opening area of the discharge port in accordance with the size of a compressed air pressure corresponding to a load applied to the table part.