Annular Tool Holder Damper for High-Speed Vibration Control
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Solution Overview
Problem
High-speed machining operations in aerospace industries face challenges with vibrations that compromise the precise tolerances required in complex geometries, leading to reduced accuracy and productivity in machine tools like milling machines.
Innovation Solution
A damping apparatus comprising an annular body with an internal cavity and elastomeric couplings is integrated into machine tools, which effectively dampens vibrations by using a dynamic moving mass and elastomeric elements to distort under load, minimizing compressibility and enhancing damping across radial, axial, and complex cutting forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high cutting speeds are used in multi-axis machining centers, then productivity is improved, but vibrations are generated that compromise machining precision and tolerance accuracy
Solution Approach 1:
The patent converts the harmful vibrations generated by high-speed cutting into a beneficial damping effect. A damping mass is introduced that moves in response to vibrations, and elastomeric couplings are used to dissipate vibrational energy, transforming the harmful mechanical vibrations into heat energy through controlled deformation of the elastomeric material.
Solution Approach 2:
The patent changes the physical parameters of the system by introducing a damping mass with specific mass properties and elastomeric couplings with controlled stiffness and damping characteristics. These parameter changes modify the vibrational response of the tool holder system, reducing resonance peaks and damping oscillations without affecting the cutting speed.
2Device complexity
If conventional tool holders are used without damping mechanisms, then device complexity is minimized, but dynamic stability and vibration control are insufficient
Solution Approach 1:
The damping mass is nested within the tool holder structure, specifically positioned within a cavity or chamber of the tool holder body. This nested arrangement allows the damping mechanism to be integrated into the existing tool holder geometry without requiring a complete redesign, maintaining relative simplicity while adding vibration control functionality.
Solution Approach 2:
The elastomeric couplings act as intermediary elements between the damping mass and the tool holder structure. These couplings transmit forces while providing isolation and damping, serving as a mediator that connects the rotating tool assembly with the damping mass, allowing vibration energy to be transferred to and dissipated by the damping mass.
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 significantly improves the dynamic stability and accuracy of machining operations by reducing vibrations, thereby increasing productivity and maintaining tight tolerances, even in high-speed cutting operations.
Implementation Method 1
The elastomeric or rubber couplings act as the dynamic couplings that distort as dynamic forces are applied to the material. The incompressibility of rubber causes the elastomeric material to distort rather than merely compress under loads. This provides the damping action.
Implementation Method 2
The elastomeric couplings act as the dynamic couplings that distort as dynamic forces are applied to the material... This provides the damping action.
Implementation Method 3
The annular body comprises an internal cavity, the cavity comprising a damping mass... provides a dynamic moving body mass within the apparatus housing that responds to and substantially dampens vibrations generated by cutting actions
Data Source
AI summary
A tool damper for a machine tool, such as a milling machine, is arranged around the tool stem of the machine or the tool holder of the machine and arranged to damper vibrations of the tool.