Vibrating Cutting Tool Notch Design for Uniform Vibration
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Solution Overview
Problem
Existing manual cutting tools with vibrating blades face challenges in achieving uniform vibration across the cutting edge, leading to static zones and compromised cut quality, and their manufacture is complex due to mechanical assembly difficulties and functional asymmetry.
Innovation Solution
A one-piece cutting tool with a bar and an elongated cutting element featuring diametrically opposed notches along the longitudinal axis, which improves vibratory behavior by eliminating vibration nodes and allowing for efficient longitudinal and transverse vibrations, enhancing cut quality and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flat cutting blade with functional asymmetry is used to create transverse vibrations, then transverse vibration at the distal end is achieved, but the mechanical assembly becomes difficult and manufacturing is complicated
Solution Approach 1:
The patent merges the cutting blade and transition zone into a single one-piece monoblock structure, eliminating the need for separate components and complex mechanical assemblies. This integration maintains the ability to generate transverse vibrations while simplifying manufacturing and assembly processes.
Solution Approach 2:
The patent introduces geometric asymmetry through notches positioned at specific locations on the cutting blade. These asymmetric features modify the vibration modes to achieve transverse vibration at the distal end without requiring complex functional asymmetry in the blade geometry itself.
2Ease of operation
If longitudinal vibrations are propagated in a cutting tool with a bar and flat blade, then transverse vibratory component is obtained, but vibration nodes form at the cutting edge creating static zones
Solution Approach 1:
The patent extracts or removes the problematic vibration nodes from the cutting edge region by introducing notches that alter the vibration mode distribution. This eliminates the formation of static zones at the cutting edge while preserving the transverse vibratory component needed for effective cutting.
Solution Approach 2:
The patent modifies the dynamic characteristics of the cutting blade through strategic notch placement. This changes the vibration modes and node positions, ensuring that vibration nodes do not form at the cutting edge during operation, thereby maintaining continuous vibration along the cutting edge.
3Manufacturing precision
If the cutting blade is made very short to avoid vibration nodes, then cut quality improves, but the blade length is limited and less versatile
Solution Approach 1:
The patent uses dynamic modification through notches to control vibration node positions, allowing the blade to maintain effective vibration along its entire length regardless of blade length. This enables longer blades to achieve uniform vibration and high cut quality without being constrained by vibration node formation.
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 tool achieves uniform and significant vibration amplitudes along the cutting edge, improving cut quality and extending the length of effective vibration without node formation, making it suitable for longer blades and easier to manufacture.
Implementation Method 1
vibrating means for creating vibrations in the bar which are oriented along the longitudinal axis of the bar. These longitudinal vibrations are propagated in the cutting tool, and make it possible to obtain vibration of the cutting blade with at least one transverse vibratory component in the plane of the blade
Data Source
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AI summary
The tool has an elongated cutting blade (102) fixed to a bar (100) by a transition zone (101). The blade includes a longitudinal cutting edge (103), and defines a longitudinal cutting plane perpendicular to a cross-section plane of the bar. A notch (104) is formed in a part in the blade's cutting edge. A notch (105) is formed in a longitudinal edge (106) of the blade, where the edge (106) is diametrically opposite to the cutting edge that is moved with respect to the notch (104) according to a longitudinal axis of the blade and towards a distal free end of the blade.