Non-Circular Coolant Passage for Uniform Rotary Cutting Tool Flow
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Solution Overview
Problem
Existing rotary cutting tools with central coolant passages of non-circular cross-sectional shapes lack flexibility in coolant duct design and do not ensure uniform coolant flow, affecting tool performance in milling operations.
Innovation Solution
A rotary cutting tool design featuring a central coolant passage with N radially outer coolant regions and transverse coolant ducts that intersect with cut-outs, allowing for flexible coolant duct direction and extent, promoting uniform and axisymmetric coolant flow to the cutting edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a central coolant passage with non-circular cross-sectional shape is used, then flexibility in coolant duct design is improved, but uniform coolant flow distribution deteriorates
Solution Approach 1:
The central coolant passage employs an asymmetric non-circular cross-sectional shape (such as triangular, rectangular, or polygonal) instead of a conventional circular shape. This asymmetric geometry enables flexible positioning and orientation of coolant ducts while maintaining uniform flow distribution through carefully designed passage dimensions and duct arrangement that compensate for the non-uniform flow patterns inherent in non-circular passages.
2Adaptability or versatility
If coolant ducts extend transversely from radially outer coolant regions, then design flexibility regarding direction and extent of coolant ducts is improved, but flow uniformity deteriorates
Solution Approach 1:
The design implements local quality optimization by positioning coolant ducts to extend transversely from specific radially outer coolant regions of the non-circular central passage. Each duct is strategically located and dimensioned to deliver coolant precisely to its associated cutting edge, with duct dimensions and orientations tailored to local flow requirements while collectively maintaining overall flow uniformity through the multi-duct configuration.
3Manufacturing precision
If the central coolant passage has a non-circular shape with radially outer coolant regions, then coolant distribution to cutting edges is improved, but tool body core strength deteriorates
Solution Approach 1:
The invention transitions from conventional circular cross-sectional geometry to non-circular (triangular, rectangular, or polygonal) cross-sections in the central coolant passage, utilizing the additional geometric degrees of freedom to optimize coolant distribution. This dimensional change in the cross-sectional shape enables better alignment of coolant flow paths with cutting edge positions while maintaining adequate core strength through optimized wall thicknesses and overall passage sizing.
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
This design enhances coolant distribution, reducing wear on cutting edges and extending tool life by ensuring smooth and undisturbed coolant flow, while maintaining core strength and flexibility in tool design.
Implementation Method 1
a central coolant passage extends along the tool axis from a rear end of the rear coupling portion to the front cutting portion
Implementation Method 2
at least one coolant duct extends transversely from each radially outer coolant region to intersect with and open out at one of the N cut-outs at a coolant exit port
Implementation Method 3
promoting uniform and axisymmetric flow of coolant fluid along each coolant duct
Implementation Method 4
ensuring smooth and undisturbed coolant flow, while maintaining core strength and flexibility in tool design
Implementation Method 5
reducing wear on cutting edges and extending tool life by ensuring smooth and undisturbed coolant flow
Data Source
AI summary
A rotary cutting tool rotatable about a tool axis in a direction of rotation having a front cutting portion and a rear coupling portion. The front cutting portion has a front outer peripheral surface with a plurality of N circumferentially spaced apart cut-outs, each cut-out having an operative cutting edge associated therewith. A central coolant passage extends along the tool axis from a rear end of the rear coupling portion to the front cutting portion. A first plane perpendicular to the tool axis intersects the central coolant passage and the N operative cutting edges. In a cross-section taken in the first plane, the central coolant passage has a non-circular shape with N radially outer coolant regions. At least one coolant duct extends transversely from each radially outer coolant region to intersect with and open out at a corresponding one of the N cut-outs at a coolant exit port.