Toolholder With Tunable Passive Vibration Absorber
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing toolholders, such as boring bars, face challenges in suppressing vibrations during metal cutting operations, leading to poor surface finishes and potential damage, with conventional solutions like solid carbide being expensive and brittle, and dynamic vibration absorbers requiring complex tuning.
Innovation Solution
A toolholder with a passive vibration absorber assembly featuring cavities filled with small-sized metal or ceramic particles or powders for particle damping, which provides tunable vibration suppression without the need for sophisticated equipment adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid carbide is used to fabricate the boring bar, then vibration and chatter are reduced, but the cost increases significantly and the bar becomes brittle
Solution Approach 1:
The patent uses a composite structure combining a metal matrix (aluminum or steel) with dispersed metal or ceramic particles. This composite approach provides vibration damping benefits similar to solid carbide while using more cost-effective and less brittle base materials. The particle reinforcement provides localized stiffness and damping without requiring the entire bar to be expensive solid carbide.
Solution Approach 2:
The invention embeds vibration-damping particles specifically in regions where vibration control is most needed, rather than making the entire bar from expensive solid carbide. The particles are distributed within the metal matrix to provide localized damping properties at critical locations while maintaining overall structural integrity and reducing overall cost.
2Reliability
If a dynamic vibration absorber is mounted on the boring bar, then vibration can be suppressed, but the absorber requires complex tuning equipment and procedures
Solution Approach 1:
The passive vibration absorber is designed to automatically adapt to different operating conditions without requiring external tuning equipment or procedures. The absorber self-adjusts its characteristics based on the vibration frequencies encountered during cutting operations, eliminating the need for complex tuning machinery and skilled operators.
Solution Approach 2:
The vibration absorber incorporates dynamic elements that automatically adjust to changing operating conditions. The absorber's natural frequency and damping characteristics can shift in response to varying cutting parameters, speeds, and loads, allowing it to maintain effectiveness across different machining scenarios without manual retuning.
3Reliability
If the metal removal rate is decreased, then vibration is minimally reduced, but production efficiency is significantly interfered with
Solution Approach 1:
The vibration damping particles are extracted and distributed within the toolholder structure itself, creating an integrated damping system. This allows the toolholder to actively suppress vibrations during high-speed cutting operations, enabling maintenance of high metal removal rates while achieving vibration control that would otherwise require slower cutting speeds.
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 toolholder effectively reduces vibrations through particle damping, offering superior damping capabilities and cost-effectiveness compared to traditional methods, while minimizing the risk of damage and allowing for easy tuning under different conditions.
Implementation Method 1
The plurality of cavities of the absorber body are partially of wholly filled with metal or ceramic particles or powders for providing particle damping for vibration suppression of the toolholder
Data Source
AI summary
A toolholder includes a cutting tool mounted to a head attached to a collar at a first end of the toolholder. A shank is located at a second, opposite end of the toolholder. A central cavity extends inwardly from the first end toward the shank. A passive vibration absorber assembly is disposed within the central cavity. The passive vibration absorber assembly includes an absorber body and an absorber cap attached to the absorber body. The absorber body has a first end, a second end opposite the first end, and one or more cavities formed in the second end. The one or more cavities of the absorber body are partially of wholly filled with metal or ceramic particles or powders to provide particle damping for suppressing vibration of the toolholder.