Multi-Insert Cutting Tool Flute Layout for Chatter Resistance
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Solution Overview
Problem
Cutting tools are prone to chatter vibration, especially at positions further from the shank, due to the design of existing cutting tools which do not effectively manage flute geometry and insert placement, leading to instability and chip discharge issues.
Innovation Solution
The cutting tool design includes a holder with strategically positioned pockets and flutes along its axis, with varying lengths and widths to minimize chatter vibration and enhance chip discharge, featuring inserts with specific geometries and attachment methods to stabilize the cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple cutting inserts are attached to a single flute at different positions along the rotation axis, then productivity is improved through continuous cutting, but chatter vibration increases at inserts located farther from the shank
Solution Approach 1:
The patent applies local quality by varying the flute geometry specifically at different locations along the rotation axis. The first flute portion (near the front end) has different dimensions than the second flute portion (near the rear end), allowing each section to be optimized for its specific functional requirements - continuous cutting capability versus chatter vibration resistance.
Solution Approach 2:
The flute is segmented into multiple portions along the rotation axis, with each portion having distinct geometric characteristics. This segmentation allows independent optimization of each flute section to address different operational requirements at different positions of the cutting tool.
2Productivity
If the flute opening width is increased to improve chip discharge, then chip removal efficiency is improved, but chatter vibration is exacerbated
Solution Approach 1:
The patent implements local quality by making the flute opening width position-dependent. The first flute portion has a first opening width while the second flute portion has a second opening width, allowing the chip discharge capability to be optimized at each location without uniformly increasing vibration across the entire tool.
3Adaptability or versatility
If the distance from the rotation axis to the flute is increased to improve cutting reach, then machining capability is improved, but structural stability deteriorates
Solution Approach 1:
The patent applies local quality by varying the radial distance from the rotation axis to the flute along the axial direction. The first flute portion extends at a first distance while the second flute portion extends at a second distance, allowing the cutting tool to achieve extended reach where needed while maintaining structural stability in other regions.
Data Source
AI summary
A cutting tool may have a columnar shape extended along a rotation axis from a first end toward a second end, and may include a holder, a first insert and a second insert. The holder may include a first pocket, a second pocket, a first flute and a second flute. The second pocket may be located closer to the second end than the first pocket. The first flute may be extended along the first pocket. The second flute may be extended along the second pocket. A first length from the rotation axis to the first flute may be smaller than a second length from the rotation axis to the second flute. An opening width of the first flute may be smaller than an opening width of the second flute.