Tubular Mass Damper Assembly for Stable Tool Vibration Tuning
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Solution Overview
Problem
Existing mass dampers for cutting tools face challenges such as cumbersome tuning, resilience material drifting, temperature sensitivity, and difficulty in sealing under high-pressure coolant conditions, leading to inefficiencies and potential damage.
Innovation Solution
A mass damper device with a tubular housing and end closures that utilize frequency-dependent resilient elements, securely held by precise compression via cooperating mounting surfaces, allowing for automatic tuning and modular integration, and featuring temperature-resistant materials and sealing mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional resilient materials (natural rubber O-rings) are used for mass damper tuning, then the mass damper can be adjusted to match vibration frequency, but the tuning becomes cumbersome and imprecise when torque is below 1 Nm due to measurement inaccuracy of +20%
Solution Approach 1:
The patent replaces the traditional mechanical screw clamping mechanism with a magnetic field-based tuning system. A magnet is positioned within the resilient material, and by moving the magnet axially, the magnetic field induces dimensional changes in the resilient material, thereby adjusting the mass damper's eigen frequency. This substitution eliminates the need for manual torque application and measurement, solving the precision and ease of operation contradiction.
2Reliability
If resilient materials are compressed to achieve tuning, then the stiffness can be adjusted to match vibration frequency, but the resilient materials are prone to creeping and the damping mass may drift from central position over time
Solution Approach 1:
The patent replaces continuous mechanical compression with a magnetic field-based tuning system. A magnet positioned within the resilient material uses magnetic field-induced dimensional changes for adjustment, eliminating continuous mechanical compression that causes creeping. This substitution enhances reliability while maintaining dimensional stability.
Solution Approach 2:
The patent incorporates a magnet within the resilient material that can be positioned in advance to induce the required dimensional changes. This beforehand positioning of the magnet provides prior cushioning against the creeping issue, as the magnetic field maintains the adjusted position without requiring continuous mechanical force, thereby preventing drift over time.
3Adaptability or versatility
If low stiffness resilient elements are used to cover wide Eigen frequency range, then the mass damper can adapt to different vibration frequencies, but the required compression torque becomes smaller than 0.1 Nm which is difficult to control precisely
Solution Approach 1:
The patent replaces mechanical compression with a magnetic field-based system. A magnet is positioned within the resilient material, and axial movement of the magnet induces dimensional changes that adjust the mass damper's eigen frequency. This substitution eliminates the need for precise torque control, allowing the system to cover a wide eigen frequency range without the measurement precision limitations of traditional mechanical methods.
4Ease of manufacture
If modular mass damper device is designed for easy integration and disintegration, then manufacturing costs are reduced and reusability is improved, but the connection between components must maintain sufficient strength and precision
Solution Approach 1:
The patent divides the mass damper device into modular components: a housing, a mass damper unit, and mounting interfaces. The housing contains the mass damper unit and provides mounting surfaces that interface with the working tool or tool holder. This segmentation allows easy integration and disintegration while maintaining connection strength through properly designed mounting surfaces and interfaces.
Solution Approach 2:
The patent designs the housing with mounting surfaces that can interface with various working tools and tool holders, providing universal compatibility. The mass damper device can be integrated into different applications without requiring custom designs, thereby reducing manufacturing costs and improving reusability while maintaining sufficient connection strength through standardized mounting interfaces.
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 provides enhanced damping efficiency, temperature stability, and ease of integration and disintegration, reducing manufacturing costs while maintaining optimal damping performance across varying frequencies and environmental conditions.
Implementation Method 1
resilient elements having frequency dependent stiffness
Implementation Method 2
the resilient materials are prone to have a creeping phenomenon and the damping mass may drift from the central position over time
Data Source
AI summary
A mass damper device includes a tubular housing having a first and a second longitudinal end; at least one damping mass which is received in the tubular housing with a circumferential clearance; a first resilient element and a second resilient element. At least one end closure is arranged at the first or second longitudinal end. The housing and the end closure have cooperating mounting surfaces which define a longitudinal mounting position of the first and second end closures. The mounting surfaces are arranged such that the first and second resilient elements are compressed between the damping mass and the end closure, when the first and second end closures have been mounted, at the longitudinal mounting position, to the housing.