Vibration Damping Toolholder with Separated Stiffness and Damping
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Solution Overview
Problem
Existing vibration damping toolholders face challenges in designing consistent damping over desired frequency and amplitude ranges due to inherent damping and stiffness interactions in spring components, making it difficult to achieve optimized responses.
Innovation Solution
A vibration damping toolholder with a movably arranged tuning mass, a primary spring element fixed at both ends to prevent relative movement, and a separate damping medium, allowing independent selection of stiffness and damping to meet specific frequency and amplitude requirements, minimizing additional damping from the spring element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a spring component is used to provide stiffness in a vibration damping device, then the desired stiffness can be achieved, but the spring component inherently adds damping to the system which affects the desired damping characteristics
Solution Approach 1:
The invention separates the stiffness-providing function (spring element) from the damping-providing function (damping medium) into independent components. The spring element provides stiffness while the damping medium provides damping, allowing each to be optimized independently without interfering with the other's characteristics.
Solution Approach 2:
The damping medium acts as an intermediary between the spring element and the tuning mass, providing damping without affecting the stiffness characteristics of the spring element. This intermediary allows independent control of damping and stiffness parameters.
2Stress or pressure
If the spring component is adjusted to meet desired stiffness, then the stiffness requirement is satisfied, but the damping of the device is affected as well
Solution Approach 1:
The device is segmented into independent stiffness-providing and damping-providing components. The spring element can be designed and adjusted for stiffness without affecting damping characteristics, which are controlled by the separate damping medium, providing significant design flexibility.
Solution Approach 2:
The invention allows independent adjustment of stiffness and damping parameters through separate components. The spring element's physical parameters can be changed to adjust stiffness, while the damping medium's properties can be independently adjusted to control damping, enabling precise tuning of both parameters.
3Reliability
If a conventional damping device is designed to provide damping over a frequency range, then some damping is achieved, but it is difficult to provide good and consistent damping over the desired frequency range and amplitude range
Solution Approach 1:
The damping device is segmented into independent functional components: the spring element for stiffness, the damping medium for damping, and the tuning mass for frequency control. This segmentation allows each component to be optimized for its specific function, achieving consistent damping across frequency and amplitude ranges without excessive complexity.
Solution Approach 2:
The invention enables independent adjustment of physical parameters for each component to optimize performance across desired frequency and amplitude ranges. The spring element's stiffness, the damping medium's damping coefficient, and the tuning mass's mass can be independently adjusted to achieve consistent damping characteristics.
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 configuration enables precise tuning for optimized damping and stiffness, reducing the toolholder's weight while maintaining effective vibration control across a range of amplitudes, with minimal impact from spring element damping, thus improving efficiency and consistency.
Implementation Method 1
a primary spring element, which is positioned inside the cavity, has an outer spring element end and an inner spring element end, and which has a longitudinal extension from the outer spring element end to the inner spring element end
Implementation Method 2
a damping medium, which surrounds the tuning mass inside the cavity
Data Source
AI summary
A vibration damping toolholder for a metal cutting tool, the toolholder including a holder body provided with an internal cavity, which extends inside the holder body along the longitudinal axis, and which has a first cavity end at a first holder body end. The damping toolholder further includes a tuning mass, which is movably arranged inside the cavity and extends along the longitudinal axis, and which has a first tuning mass end at the first holder body end. The damping toolholder also includes a damping medium, which surrounds the tuning mass inside the cavity, and a single primary spring element, which is positioned inside the cavity. An outer spring element end is immovably fixed to a first cavity end at the longitudinal axis, and an inner spring element end is immovably fixed to the first tuning mass end at the longitudinal axis.