Rotary Table Bearing Direct Support Precision
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Solution Overview
Problem
Existing rotary table devices for machine tools face precision issues during positioning processing due to flexing of the main shaft under large cutting forces, leading to reduced processing accuracy, and are often limited to performing either positioning or contouring processing without maintaining precision in both modes.
Innovation Solution
A rotary table device design featuring a bearing positioned between the table and the frame, with the bearing interposed between the table and the cylinder portion, and located within the pressure chamber's radial range, provides direct support to the table, minimizing flexing and maintaining precision during both positioning and contouring processing by distributing forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the table is indirectly supported by the frame through the main shaft, then the device can perform both positioning and contouring processing, but the main shaft flexes under large cutting forces during positioning processing, causing the table to tilt and reducing processing precision
Solution Approach 1:
A bearing is introduced as an intermediary component between the table and the frame. This bearing directly supports the table, preventing it from tilting under cutting forces during positioning processing, while allowing the main shaft to flex without transmitting this flexing to the table. The bearing acts as a mediator that decouples the table's positional stability from the main shaft's mechanical flexibility.
2Device complexity
If a bearing is provided between the frame and the main shaft with indirect table support, then the device structure is simpler, but the table tilts under large moments during positioning processing
Solution Approach 1:
The bearing serves as a mediating element that directly connects the table to the frame, providing stable support without requiring complex reinforcement of the main shaft or supporting structure. This intermediary bearing maintains table positioning accuracy while keeping the overall device structure relatively simple.
3Manufacturing precision
If the table is directly supported by the frame through a bearing, then processing precision is maintained under large cutting forces, but the device complexity increases
Solution Approach 1:
The bearing is a relatively simple mechanical component that provides direct support between the table and frame. By using this standard intermediary component, the patent achieves high processing precision without introducing significant device complexity, as the bearing integrates smoothly into the existing rotary table structure.
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 design enhances processing precision by minimizing table tilting and flexing, allowing for accurate performance of both positioning and contouring processing without compromising precision, even under large cutting forces.
Implementation Method 1
a bearing that is provided between the table and the frame, and that directly supports the table with respect to the frame
Implementation Method 2
When an operating fluid is supplied to the pressure chamber, the clamp piston is caused to press-contact the clamp surface, so that the table is brought into a clamped state
Data Source
AI summary
A rotary table device for a machine tool includes a main shaft that is rotatably supported in an insertion hole formed in a frame; a table that is secured to an end side of the main shaft, and on which a workpiece, serving as an object to be processed, is mounted; a clamp piston that is provided so as to be movable in an axial direction of the main shaft in the insertion hole; and a bearing that is provided between the table and the frame, and that directly supports the table with respect to the frame. The main shaft has a clamp surface facing the table. A pressure chamber is defined by the frame and the clamp piston. When an operating fluid is supplied to the pressure chamber, the clamp piston is caused to press-contact the clamp surface, so that the table is brought into a clamped state.