Rotary Tool Coolant Hole Geometry for Edge Cooling and Chip Discharge
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Solution Overview
Problem
Existing rotary tools face challenges in effectively cooling the cutting edge and efficiently discharging chips during machining, leading to reduced tool life and increased heat accumulation, particularly due to suboptimal coolant hole designs that result in flow path losses and inadequate cooling distribution.
Innovation Solution
A rotary tool with a coolant hole design featuring convex and concave curved portions that direct cooling liquid efficiently to both the outer periphery and central regions of the cutting edge, enhancing cooling and chip discharge by managing centrifugal force and flow momentum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple coolant hole design is used, then the device complexity is reduced, but the cooling effectiveness and chip discharge efficiency deteriorate
Solution Approach 1:
The coolant hole incorporates curved portions (first, second, and third curved sections) instead of straight paths. These curved geometries redirect the coolant flow to effectively reach both the outer peripheral side and the central side of the cutting edge, improving cooling distribution and chip discharge efficiency without adding complex external components
2Temperature
If coolant flows directly to the cutting edge, then cooling effectiveness is improved, but flow path losses increase due to inadequate flow management
Solution Approach 1:
The coolant hole performs preliminary flow direction adjustments through its curved portions before the coolant reaches the cutting edge. The first curved portion directs coolant toward the outer peripheral side, while the second and third curved portions redirect flow toward the central side, ensuring optimal cooling coverage and reducing turbulent losses by pre-positioning the coolant flow paths
3Device complexity
If coolant hole opens only at the tip end, then the structure is simplified, but chip discharge efficiency and cooling distribution to different regions deteriorate
Solution Approach 1:
The coolant hole is segmented into multiple functional sections along its length: a first curved portion for outer peripheral cooling, a second curved portion for central region cooling, and a third curved portion for additional flow control. This segmentation allows the single coolant hole to serve multiple cooling zones and improve chip discharge efficiency through strategic flow distribution
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 innovative coolant hole design effectively cools the cutting edge and discharges chips, improving tool performance by reducing heat accumulation and chip formation, thereby extending tool life and enhancing machining efficiency.
Implementation Method 1
enhancing cooling and chip discharge by managing centrifugal force and flow momentum
Implementation Method 2
The innovative coolant hole design effectively cools the cutting edge and discharges chips, improving tool performance by reducing heat accumulation
Data Source
AI summary
A rotary tool includes a coolant hole opening in a flank face. The coolant hole includes, in a cross section orthogonal to a rotational axis of the rotary tool, a first portion protruding toward a front in a rotation direction of the rotational axis and toward an outer peripheral side and having a convex curved shape, a second portion protruding toward the front in the rotation direction and toward a central side having a convex curved shape, and a third portion protruding toward a rear in the rotation direction and toward the central side and having a convex curved shape.