Rotary Cutting Tool Flute Layout for Chip Clearance and Stiffness
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Solution Overview
Problem
Existing rotary cutting tools require multiple tools for slotting, rough side cutting, and finish side cutting operations due to fixed flute depths and widths, which limits their versatility and efficiency in machining different materials.
Innovation Solution
A rotary cutting tool design where the width and depth of each flute are proportionally adjusted to match the actual feed-per-tooth, allowing for varying flute spaces and optimized cutting performance across different machining operations, enabling a single tool to perform all three operations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the depth of flutes is increased to create good chip clearance, then chip evacuation is improved, but tool stiffness is deteriorated
Solution Approach 1:
The flute depth is segmented into multiple sections along the cutting length, with each section having different depths optimized for specific machining operations. The first section has greater depth for slotting operations to ensure adequate chip clearance, while subsequent sections have reduced depths to maintain tool stiffness for finishing operations.
Solution Approach 2:
Different sections of the flute are given different local qualities in terms of depth. The first section (from cutting edge to first transition region) has greater depth for effective chip evacuation during slotting, while the second and third sections have progressively reduced depths to maintain stiffness during roughing and finishing operations respectively.
2Adaptability or versatility
If a single tool is designed to perform multiple operations (slotting, rough side cutting, finish side cutting), then tool versatility is improved, but tool design complexity is increased
Solution Approach 1:
The cutting tool is segmented into multiple functional sections along its length, with each section optimized for a specific machining operation. The first section is optimized for slotting with deeper flutes and specific core diameter ratio, the second section for rough side cutting with intermediate parameters, and the third section for finish side cutting with shallower flutes and higher core diameter ratio.
Solution Approach 2:
The cutting tool is designed with multi-functionality to perform slotting, rough side cutting, and finish side cutting operations with a single tool. This is achieved by incorporating varying flute depths and core diameter ratios along the cutting length, allowing one tool to replace multiple specialized tools.
3Object-generated harmful factors
If the core diameter ratio is optimized for slotting operations, then chip clearance is improved, but tool stiffness is reduced
Solution Approach 1:
The core diameter ratio is segmented along the cutting length, with the first section having a lower core diameter ratio (40-55%) optimized for chip clearance during slotting operations, while subsequent sections have progressively higher core diameter ratios to maintain stiffness for roughing and finishing operations.
Solution Approach 2:
Different sections of the tool are given different local qualities in terms of core diameter ratio. The first section has a lower core diameter ratio to maximize chip clearance capacity during slotting, while the second and third sections have progressively higher ratios to ensure adequate stiffness for rough side cutting and finish side cutting operations.
Data Source
AI summary
A rotary cutting tool that implements a chip space in proportion to a feed-per-tooth is proposed. The rotary cutting tool includes a cutting part in which a plurality of cutting teeth and flutes are alternately formed, wherein a cross-section of the cutting part perpendicular to a central axis is divided into a plurality of cutting tooth spaces defining a section between cutting edges of adjacent cutting teeth on the basis of the central axis, such that all of the cutting tooth spaces are designed in different sizes, or some of the plurality of cutting tooth spaces are set in different sizes from the other cutting tooth spaces.