Externally Mounted Dynamic Absorber for Toolholder Vibration Control
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Solution Overview
Problem
Vibrations between a cutting tool and a workpiece during metal cutting operations lead to poor surface finish and tool damage, and conventional methods to reduce vibration, such as internal absorber masses, compromise toolholder stiffness and are limited in size.
Innovation Solution
An externally mounted dynamic absorber on the toolholder's surface, with a rigid support member and cover member allowing adjustable compression of resilient supports, maximizes damping without reducing the toolholder's stiffness, enabling larger absorber sizes for various cutting tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an absorber mass is internally mounted within a cavity of the shank, then vibrations are suppressed, but the overall stiffness of the toolholder is reduced
Solution Approach 1:
The absorber mass is extracted from the internal cavity of the shank and relocated to an external position on the toolholder. This allows the absorber mass to be mounted outside the shank structure, eliminating the need to reduce shank wall thickness and thereby maintaining the overall stiffness of the toolholder while still achieving vibration suppression through the dynamic absorber mechanism
2Object-affected harmful factors
If an absorber mass is internally mounted within a cavity of the shank, then vibrations are suppressed, but the size of the absorber mass is limited by the cavity size
Solution Approach 1:
The absorber mass is extracted from the constrained internal cavity and positioned externally on the toolholder. This extraction removes the geometric constraints imposed by the cavity size, allowing the absorber mass to be scaled to appropriate sizes for different toolholder applications and vibration frequencies without being limited by internal space availability
Solution Approach 2:
The absorber mass is relocated from a three-dimensional internal cavity constraint to an external surface mounting configuration. This dimensional transition allows the absorber mass to extend in directions not constrained by the toolholder's internal geometry, enabling larger and more versatile absorber mass configurations for different vibration control requirements
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 externally mounted dynamic absorber effectively suppresses vibrations, maintaining toolholder stiffness and improving damping capabilities, as shown in frequency response simulations, with enhanced performance compared to conventional designs.
Implementation Method 1
a resilient support circumscribes each end of the absorber mass to suspend the absorber mass within the cavity
Implementation Method 2
externally mounting a dynamic absorber on an exterior surface of the toolholder
Data Source
AI summary
A toolholder includes a body portion having an exterior surface and a dynamic absorber mounted on the exterior surface of the body portion. The dynamic absorber includes a rigid support member, a cover member, and an absorber mass disposed within a cavity formed by the rigid support member and the cover member. A first resilient support member is disposed between the rigid support member and the absorber mass, and a second resilient support member is disposed between the cover member and the absorber mass. The dynamic absorber is tuned by moving the cover member relative to the rigid support member. A method of suppressing vibrations of the toolholder includes externally mounting the dynamic absorber on the exterior surface of the toolholder.