Arcuate End Mill Cutting Edges for Stable High-Speed Milling
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Solution Overview
Problem
Milling tools experience vibration and stability issues due to high cutting forces, especially at high cutting speeds.
Innovation Solution
A milling tool with a geometry featuring first and second cutting edges that form arcuate lines of intersection, with different extensions, reducing cutting forces and improving stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional milling tools with straight or simple curved cutting edges are used, then the tool structure is simple and easy to manufacture, but high cutting forces cause vibration and stability issues at high cutting speeds
Solution Approach 1:
The cutting edges are designed with arcuate profiles instead of straight lines, creating curved cutting paths that reduce cutting forces. The arcuate geometry modifies the chip thickness distribution and contact conditions between tool and workpiece, leading to improved stability and reduced vibration during high-speed milling operations.
Solution Approach 2:
Different cutting edges on the same tool are given different arcuate profiles with varying radii of curvature. This local differentiation allows each cutting edge to optimize its cutting action for specific positions around the tool, reducing overall cutting forces and improving stability without requiring complete redesign of the entire tool structure.
2Reliability
If arcuate cutting edges with different extensions are used, then cutting forces are reduced and stability improved, but tool wear increases due to variable chip thickness
Solution Approach 1:
The radius of curvature and extension of each arcuate cutting edge are carefully optimized to balance the reduction of cutting forces against the acceptance of increased tool wear. By adjusting these geometric parameters, the tool achieves improved stability during operation while managing the trade-off of potentially reduced tool life due to variable chip thickness conditions.
Data Source
Figure 1A~3B
Figure 4A~5B
Figure 6A~6B
AI summary
The invention relates to a milling tool (40, 50, 60) having a first cutting portion (24, 25, 26) comprising a first (41, 51, 61) and a second (42, 52, 62) cutting edge extending at the periphery of the first cutting portion along, or following a helical path around, a longitudinal axis (L) of the milling tool. The first and second cutting edges are arranged such that, when the milling tool is rotated around its longitudinal axis (L), they form respective first (41', 51', 61') and second (42', 52', 62') lines of intersection in a central plane (CP) containing the longitudinal axis (L), wherein the first and the second lines of intersection are arcuate. The extension of the first cutting edge is different from the extension of the second cutting edge such that the first line of intersection is different from the second line of intersection.