Modular Spindle Tuned Mass Damping for Multi-Frequency Vibration
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Solution Overview
Problem
Existing vibration damping devices for machine tool spindles are ineffective in attenuating vibrations with different resonant frequencies and are poorly positioned to maximize damping effect, as they only address one type of resonant frequency and are installed far from the source of vibration.
Innovation Solution
A vibration damping device comprising a support plate, support bars, and stacked arc-shaped weight disks with different resonant frequency characteristics, along with a damping sheet, is installed at the distal end of the machine tool spindle to effectively dampen various resonant frequencies by being positioned closest to the source of vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a vibration damping device is installed at the rear end of the machine tool spindle, then the device can be positioned away from the vibration source, but the vibration damping effect is deteriorated due to the distance from the front end where vibration occurs
Solution Approach 1:
The patent transitions from installing the damping device at the rear end (one-dimensional positioning) to installing it at the distal end/front end (different spatial dimension) of the spindle, thereby reducing the distance to the vibration source and improving damping effectiveness while maintaining installation flexibility
2Device complexity
If a single tuned mass member is used in the vibration damping device, then the device is simple in structure, but it can only dampen one type of resonant frequency
Solution Approach 1:
The patent divides the single tuned mass member into multiple weight disks with different masses and resonant frequency characteristics, allowing each disk to target specific resonant frequencies while maintaining an organized, modular structure that balances complexity with functionality
Solution Approach 2:
The vibration damping device is designed to perform multiple functions by incorporating weight disks that can dampen various types of vibrations with different resonant frequencies, making the device adaptable to diverse vibration scenarios rather than limited to a single frequency
3Adaptability or versatility
If multiple weight disks with different resonant frequency characteristics are stacked, then the device can dampen various resonant frequencies, but the device complexity increases
Solution Approach 1:
The patent implements a nested structure where multiple weight disks with different resonant frequency characteristics are stacked concentrically on the same support bar, allowing the device to dampen multiple frequencies while maintaining a compact form factor and managing structural complexity through spatial efficiency
4Reliability
If the vibration damping device is installed at the distal end of the machine tool spindle, then the device is positioned closest to the vibration source, but the installation space is limited
Solution Approach 1:
The patent employs a thin damping sheet as the core damping element, which can be installed in the limited space at the distal end of the spindle. The thin film structure provides effective vibration damping while occupying minimal installation space, resolving the contradiction between damping effectiveness and space availability
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 maximizes vibration damping by effectively attenuating a variety of vibrations with different resonant frequencies and enhances the damping effect by being installed at the point of occurrence, utilizing modular types with distinct resonant frequency bands.
Implementation Method 1
at least one pair of weight disks stacked by a plurality of arc-shaped disks made of a tuned mass member
Implementation Method 2
a vibration damping device where a tuned mass member elastically supported by a rigid member is installed at a rear end of the machine tool spindle
Implementation Method 3
a damping sheet made of an elastic member which becomes closely in contact with the outer periphery of the machine tool spindle and pressed by the weight disk
Implementation Method 4
damping sheet made of an elastic member
Data Source
AI summary
A vibration damping device for a machine tool spindle is provided. An annular support plate is mounted at a lower portion of a distal end of the spindle, a plurality of support bars is fixed to the support plate in a vertical direction and installed in a longitudinal direction of the spindle adjacent to an outer periphery of the spindle, a pair of weight disks stacked by a plurality of arc-shaped disks made of a tuned mass member is fixed to be in close contact with the outer periphery of the spindle, facing each other, and a damping sheet made of an elastic member is inserted between the outer periphery of the spindle and the weight disks. The vibration damping device of the present invention may maximize a vibration damping effect by installing the vibration damping device at a position closest to the spindle where a vibration occurs. Furthermore, the vibration damping device of the present invention may effectively attenuate a variety of vibration phenomena having various resonant frequencies of a machine tool spindle by constituting the vibration damping device in a plurality of modular types which have different resonant frequency bands, respectively.