End Mill Notch Layout for Chatter-Resistant High-Feed Machining
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Solution Overview
Problem
Conventional end mills with notch portions struggle to suppress chatter vibration and chipping, especially during high-efficiency machining with large axial cutting depths and high feed rates, due to overlapping notch positions leading to uneven cutting resistance.
Innovation Solution
The end mill features multiple notch portions on its outer peripheral cutting edges, positioned such that their circumferential positions do not overlap, dispersing cutting resistance variations and reducing the likelihood of chatter vibration and chipping by varying the spacing and twist angles of the notch portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of notch portions is increased to improve chip breaking ability, then chip length is reduced and chip discharge performance is improved, but the notch portions may align in the axial direction causing large local variations in cutting resistance that promote vibration
Solution Approach 1:
The patent applies asymmetry by intentionally designing the circumferential positions of notch portions to be non-uniform and non-overlapping. Each notch portion is positioned at a specific circumferential angle that prevents alignment with other notches in the axial direction, creating an asymmetric distribution pattern that disperses cutting resistance variations and suppresses vibration while maintaining effective chip breaking.
Solution Approach 2:
The patent implements preliminary action by pre-calculating and pre-positioning the notch portions at specific circumferential angles before machining operations begin. The design ensures that during rotation, the notches will never align in the axial direction, proactively preventing vibration issues before they occur during high-speed machining.
2Productivity
If notch portions are provided to reduce chip length, then chip breaking ability is improved, but chatter vibration and chipping occur more frequently during high-efficiency machining with large axial cutting depths
Solution Approach 1:
The patent applies local quality by creating non-uniform distribution of notch portions around the circumference, where each notch is positioned at a specific location optimized to prevent alignment. This local variation in notch positioning ensures that cutting resistance variations are dispersed throughout the rotation cycle rather than concentrated, maintaining cutting stability during high-efficiency machining operations.
3Productivity
If multiple notch portions are added to enhance chip breaking, then chip discharge performance improves, but the complexity of positioning and manufacturing increases
Solution Approach 1:
The patent implements preliminary action by pre-defining the circumferential positions of all notch portions in the design phase. The specific angular positions are calculated beforehand to ensure non-overlapping arrangement during rotation, simplifying the manufacturing process by providing clear positioning guidelines rather than requiring complex real-time adjustments during machining.
Data Source
AI summary
An end mill includes: an end mill body configured to be rotatable around an axis; a chip discharge groove configured to extend from a tip in an axial direction of the end mill body toward a rear end side in the axial direction while twisting around the axis; and outer peripheral cutting edges each being configured to be formed at an intersection ridge portion on a forward side in a rotation direction between the chip discharge groove and an outer peripheral flank face. At least one outer peripheral cutting edge includes a plurality of notch portions that discontinue the outer peripheral cutting edge. Circumferential positions of all the notch portions in the end mill body do not overlap each other.