Machining Tool with Cavity Damping Particles
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Solution Overview
Problem
Conventional machining tools experience significant vibrations due to the forces exerted during machining, which limits their length and cutting quality, and attempts to integrate passive vibration dampers increase weight and material usage without effectively addressing the issue.
Innovation Solution
Incorporating a cavity in the tool body filled with hollow structural elements that have freely movable solid particles or hollow bodies, which provide effective vibration damping by absorbing and dissipating vibrations through their distinct natural frequencies, reducing the tool's weight and susceptibility to vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the tool body is made longer in the longitudinal direction, then the tool can perform machining operations on more extended workpieces, but the vibrations in the tool body increase significantly
Solution Approach 1:
The patent introduces a cavity into the tool body structure, changing the physical parameters of the tool by creating a void space. This cavity modification alters the natural frequencies and vibration characteristics of the tool body, allowing longer tool lengths without proportionally increasing vibrations
Solution Approach 2:
The patent fills the cavity with hollow structural elements containing freely movable particles or hollow bodies, creating a composite vibration damping system. This composite structure combines the rigidity needed for tool strength with the vibration-absorbing properties of the movable particles, resolving the contradiction between tool length and vibration control
2Object-affected harmful factors
If passive vibration dampers are integrated into the tool, then vibrations are reduced, but the weight of the tool increases considerably
Solution Approach 1:
The patent uses hollow structural elements with thin walls as the vibration damping medium. These hollow structures provide effective vibration damping while maintaining low weight, as the hollow configuration reduces material usage compared to solid dampers
Solution Approach 2:
The patent changes the physical state and arrangement of the damping material by using freely movable particles or hollow bodies within the cavity. This parameter change allows the damping material to adapt to vibration forces while minimizing weight, as the particles can move independently to absorb vibration energy without requiring heavy structural support
3Object-affected harmful factors
If more material is used to reduce vibrations, then the tool body becomes more rigid and vibration-resistant, but the cost and energy consumption increase
Solution Approach 1:
The patent employs hollow structural elements that create a porous-like structure within the tool body cavity. This porous configuration provides effective vibration damping through the air spaces and movable particles while using significantly less material than a solid tool body, reducing both material quantity and associated costs
Solution Approach 2:
The patent creates a composite structure combining the tool body material with hollow structural elements filled with particles or hollow bodies. This composite approach achieves superior vibration damping with reduced material usage, as the hollow elements provide damping functionality without requiring substantial material quantity
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 approach allows for longer tool bodies with reduced weight and vibrations, maintaining cutting quality while minimizing material usage and avoiding additional imbalance, enabling tools to be designed with increased length and reduced weight without enhanced vibration susceptibility.
Implementation Method 1
the particles or hollow bodies that are received within the hollow structural elements have very good vibration-damping properties. In particular in the case of shocks occurring abruptly, the freely movable particles or hollow bodies initially remain in position because of their inertia, and thereby provide shock damping. Should the tool body vibrate, vibration is also excited in the freely movable particles or hollow bodies. Since the natural frequencies of vibration in the freely movable particles or hollow bodies differ significantly from the natural frequency of the tool, however, this results in effective damping of the vibration.
Implementation Method 2
Simply by reducing the weight, the natural frequencies of the tool are increased and therefore the susceptibility to vibration is reduced.
Data Source
AI summary
A tool for machining work pieces is disclosed. In order to provide a tool which exhibits only very small vibrations during operation, the tool body of the tool has a cavity in which a multiplicity of hollow structural elements having an outer closed shell, within which at least one solid particle or a hollow body is arranged in a freely movable manner, are accommodated.