Main Spindle Chuck With Pneumatic Clamping and Vibration Support
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional main spindle devices face challenges in high-speed rotation, size reduction, and fine adjustment of chuck clamping force due to balance issues, complexity in configuration, and the need for external components, making high-precision machining difficult.
Innovation Solution
A main spindle device with a cylindrical structure incorporating compressed air flow paths and pistons, where the cylinder and pistons are positioned near the collet to facilitate high-speed rotation, compact design, and precise clamping force adjustment, using a chuck unit with a collet grasping mechanism and a steady rest pipe to prevent vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If toggle method is used for clamping collet, then clamping force can be applied, but device becomes hard to rotate at high speed due to balance loss
Solution Approach 1:
The patent replaces the mechanical toggle system with a pneumatic system using compressed air to apply clamping force. The compressed air acts directly on the collet through the chuck, eliminating the need for mechanical toggles that cause balance issues during high-speed rotation. This substitution of mechanical components with pneumatic components resolves the contradiction between maintaining clamping force and achieving high-speed rotation.
2Force
If toggle method is used for clamping collet, then clamping force can be applied, but device size increases due to external components
Solution Approach 1:
The patent integrates the compressed air storage and delivery system within the main spindle structure itself, rather than using external add-on components. The compressed air is stored in a reservoir integrated into the spindle and delivered directly to the chuck, merging multiple functions (air storage, air delivery, clamping) into a single compact unit. This integration eliminates the need for external cylinders and piping, thereby reducing overall device size while maintaining clamping capability.
3Force
If toggle method is used for clamping collet, then clamping force can be applied, but fine adjustment of clamping force becomes difficult
Solution Approach 1:
The patent enables fine adjustment of clamping force by controlling the pressure parameter of the compressed air. By varying the air pressure within a continuous range, the operator can precisely adjust the clamping force applied to the collet and workpiece. This continuous parameter control through pneumatic pressure provides much finer adjustment capability compared to the discrete mechanical adjustments required by toggle systems.
4Device complexity
If coned disc springs are positioned away from collet, then device structure is simplified, but balance is lost during high-speed rotation
Solution Approach 1:
The patent eliminates the need for coned disc springs by using a pneumatic system. Compressed air is directed through passages in the spindle to act directly on the collet, removing the mechanical spring components entirely. This substitution not only simplifies the structure but also eliminates the balance problems associated with positioning spring components, enabling high-speed rotation.
5Force
If coned disc springs are made long to achieve sufficient spring force, then clamping force is adequate, but device size cannot be reduced
Solution Approach 1:
The patent uses pneumatic pressure from compressed air to generate clamping force, replacing the mechanical spring system. The compressed air acts on a piston or directly on the collet through the chuck, generating sufficient clamping force in a compact space. This pneumatic approach eliminates the need for long spring components, allowing the device to maintain adequate clamping force while achieving significant size reduction.
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
Enables high-speed rotation, compact size, efficient power transmission, and precise machining with adjustable clamping force, effectively suppressing work vibration and enhancing machining accuracy.
Implementation Method 1
compressed air flow paths 11 and 12 are formed in the main spindle 1 along a direction in which an axial line of the main spindle 1 extends
Implementation Method 2
a piston 311 and a piston 321 which are positioned near the collet 6
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A main spindle device has a main spindle (1) having a hollow hole, and a chuck unit (10) for grasping a work (W). A pipe unit (71) is inserted into the hollow hole of the main spindle (1) and receives insertion of the work (W) to thereby prevent the work (W) from vibrating when rotated together with the rotation of the main spindle. A support unit (72) supports the pipe unit (71) at one end of the main spindle (1) such that the axial line of the pipe unit (71) coincides with the axial line of the main spindle (1) and such that one end of the pipe unit (71) projects from the one end of the main spindle (1) to be positioned inside the chuck unit (10).