Segmented Vibration Damping Mechanism for Tool Holder Stability
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Solution Overview
Problem
Conventional vibration damping mechanisms face challenges in increasing vibration energy absorption without increasing the cost of the damping weight or reducing the strength of the tool holder, as they either require expensive heavy metals or large hollow portions to accommodate heavier weights.
Innovation Solution
A vibration damping mechanism with multiple radially divided weight members and annular elastic urging members within a cylindrical hollow portion, allowing sliding contact and increased friction energy absorption, while maintaining structural integrity and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a heavier vibration damping weight is accommodated within the hollow portion to increase vibration energy absorption, then the absorption amount of vibration energy is improved, but the manufacture cost increases when using expensive super-hard alloy or heavy metal
Solution Approach 1:
The vibration damping weight is divided into multiple segmented weights that can be accommodated within the hollow portion. This segmentation allows the use of lighter materials while achieving the same vibration damping effect through the combined mass of multiple segments, thereby reducing manufacture cost without sacrificing vibration energy absorption capability.
Solution Approach 2:
The patent utilizes the radial dimension by arranging multiple segmented weights circumferentially within the hollow portion. This dimensional arrangement maximizes the use of available space, allowing adequate mass for vibration damping without requiring a single heavy component, thus avoiding the need for expensive materials.
2Loss of energy
If a heavier vibration damping weight is accommodated within the hollow portion to increase vibration energy absorption, then the absorption amount of vibration energy is improved, but the strength of the shaft section is reduced when enlarging the hollow portion
Solution Approach 1:
By segmenting the vibration damping weight into multiple smaller weights arranged circumferentially, the patent achieves adequate mass for vibration damping within a compact hollow portion. This prevents the need to enlarge the hollow portion, thereby maintaining the strength of the shaft section while still providing effective vibration energy absorption.
Solution Approach 2:
The patent exploits the circumferential dimension by arranging multiple segmented weights around the hollow portion. This allows maximizing the mass distribution within the available radial space, achieving effective vibration damping without increasing the overall size of the hollow portion, thus preserving shaft section strength.
3Device complexity
If a single vibration damping weight is used to absorb chattering vibration energy through friction or impact, then the structure is simple, but the absorption amount of vibration energy is limited by the weight's mass
Solution Approach 1:
The vibration damping weight is segmented into multiple weights that can slide relative to each other. This segmentation increases the total friction interfaces from one weight's contact with the hollow portion to multiple contacts between segmented weights and the hollow portion, thereby significantly increasing vibration energy absorption capability while maintaining relatively simple structure.
Solution Approach 2:
The patent combines multiple segmented weights within a single hollow portion, merging their individual vibration damping effects. The cumulative friction and impact from all segmented weights working together produces enhanced vibration energy absorption compared to a single weight, while the components remain integrated within one housing.
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
Enhances vibration energy absorption with reduced manufacturing costs and maintains the strength of the shaft section by utilizing sliding friction between weight members, effectively alleviating chattering vibrations and stabilizing the tool holder's rotation.
Implementation Method 1
urging members for urging the weight members along the direction toward the axis such that dividing faces of adjacent weight members are brought into surface contact with each other while being slidable against each other, the urging members being annular elastic members
Implementation Method 2
the dividing faces of the adjacent weight members can be caused to slide against each other, so that the vibration energy can be absorbed as friction energy or impact energy generated between the dividing faces
Implementation Method 3
the vibration energy can be absorbed as friction energy or impact energy generated between the dividing faces
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Provided is a vibration damping mechanism that allows increase of an absorption amount of vibration energy, with less possibilities of increase in the manufacture cost of a vibration damping weight and of reduction in the strength of a shaft section. Within a cylindrical hollow portion 6 formed inside the shaft section 1, there are accommodated a plurality of weight members 14 divided from each other along the circumferential direction about the axis of the hollow portion. An urging member 16 is provided for urging the weight members toward the axis such that dividing faces 15 of adjacent weight members are brought into surface contact with each other.