Machine Tool Damper Assembly for Wide-Range Vibration Damping
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Solution Overview
Problem
Existing damper devices for machine tools struggle with effective vibrational damping over a wide frequency range, often requiring complex manual tuning and resulting in compromised surface finish and increased production costs.
Innovation Solution
A damper device comprising a tubular element with a damping mass supported by spring elements and a vibration damping material compressed between the tubular element and a fixed part, which attenuates both kinetic and potential vibration energy across multiple frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual tuning of spring elements is performed to match vibrational frequencies, then vibrational damping effectiveness is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The spring element is designed with a frequency-dependent elastic modulus that enables self-tuning. The material automatically adjusts its stiffness characteristics based on the vibrational frequency, eliminating the need for manual tuning by operators while maintaining optimal damping effectiveness across different frequency ranges.
Solution Approach 2:
The spring element utilizes a material whose elastic modulus changes with frequency. This parameter change allows the spring to adapt its mechanical properties dynamically, providing effective damping across a broader frequency range without requiring complex adjustment mechanisms or manual intervention.
2Ease of operation
If pre-tuned mass dampers with viscous fluid are used, then ease of operation is improved, but adaptability to different frequency ranges is reduced
Solution Approach 1:
The spring element employs a material with frequency-dependent elastic modulus, allowing the damper to automatically adapt its stiffness characteristics to different vibrational frequencies. This enables a single pre-tuned design to effectively operate across a broader frequency range compared to traditional fixed-stiffness dampers.
Solution Approach 2:
The invention uses composite or advanced material structures in the spring element that combine different material properties to achieve frequency-dependent behavior. This allows the spring to exhibit varying stiffness characteristics across different frequency ranges while maintaining a simple pre-tuned assembly structure.
3Productivity
If high material removal rate is pursued with high speed and high depth of cut, then productivity is improved, but vibrations increase deteriorating surface quality
Solution Approach 1:
The damper device utilizes controlled mechanical vibration principles by employing a mass-spring system that resonates at frequencies matching the toolholder vibrations. This transfers vibrational energy to the damping mass, reducing chatter vibrations and improving surface quality even during high-productivity machining operations.
Solution Approach 2:
The invention converts the harmful vibrational energy generated during high-speed machining into useful damping action. By tuning the mass-spring system to resonate at the same frequency as the toolholder vibrations, the system absorbs and dissipates the harmful chatter vibrations, transforming them into stabilizing forces that improve surface finish.
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 proposed damper device significantly improves vibrational damping capacity, enhancing machining performance by maintaining surface finish quality and extending tool lifetime while simplifying assembly and reducing costs.
Implementation Method 1
The spring elements comprise a material having a frequency dependent elastic modulus to provide a self-tuning effect
Implementation Method 2
a vibration damping material provided between the first surface and the second surface, the vibration damping material being arranged to attenuate potential vibration energy of the damper device
Implementation Method 3
the damping mass and the at least one spring element being arranged to attenuate kinetic vibration energy of the damper device
Data Source
AI summary
A damper device for a machine tool, the damper device comprising a tubular element having a cavity and a central axis, the tubular element comprising a first surface; a damping mass arranged within the cavity and movable radially with respect to the central axis and relative to the tubular element; at least one spring element supporting the damping mass relative to the tubular element, the damping mass and the at least one spring element being arranged to attenuate kinetic vibration energy of the damper device; at least one fixed part having a fixed interior portion inside the cavity and a second surface; and a vibration damping material provided between the first surface and the second surface, the vibration damping material being arranged to attenuate potential vibration energy of the damper device; wherein the vibration damping material is substantially evenly compressed between the first surface and the second surface.