Chip-Splitting End Mill Geometry for Stable Chip Evacuation
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Solution Overview
Problem
Existing end mills face challenges in efficiently evacuating chips from the curved portion of the cutting edge, leading to potential tool vibrations and damage.
Innovation Solution
The end mill features a cutting section with radially protruding teeth, each with a rake surface, clearance surface, and cutting edge. The front cutting edges are interrupted by chip splitting grooves, forming a line of intersection in a central plane with specific crests, troughs, and curve parts, ensuring effective chip evacuation and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the front cutting edge is curved to enable radial cutting, then the cutting capability is improved, but chip evacuation becomes difficult and tool vibrations increase
Solution Approach 1:
The continuous front cutting edge is segmented into multiple discrete cutting points by introducing chip splitting grooves. This segmentation allows chips to be divided into smaller segments that can be more easily evacuated from the cutting zone, while the segmented structure still maintains the overall curved geometry needed for radial cutting capability.
Solution Approach 2:
Chip splitting grooves act as intermediary structures that facilitate chip evacuation. These grooves provide designated pathways for chips to follow, mediating between the curved cutting edge geometry and the chip removal requirement, preventing chips from getting stuck between the tool and workpiece.
2Object-generated harmful factors
If chip splitting grooves are introduced to improve chip evacuation, then chip removal is improved, but the strength of the front cutting edge may be reduced
Solution Approach 1:
The chip splitting grooves are strategically positioned at specific locations along the front cutting edge where they provide chip segmentation benefits without compromising the overall structural integrity. The grooves are designed with specific dimensions and spacing to ensure they enhance chip evacuation while maintaining sufficient material between grooves to preserve cutting edge strength.
Solution Approach 2:
The parameters of the chip splitting grooves (depth, width, spacing, curvature radius) are carefully controlled and optimized. By adjusting these parameters, the design achieves the right balance between effective chip segmentation and maintaining the structural strength of the front cutting edge, ensuring the radius of curvature remains larger than 0.1mm to avoid stress concentration.
3Manufacturing precision
If the front cutting edge has sharp corners for precise cutting, then cutting precision is improved, but stress concentration increases and tool damage risk rises
Solution Approach 1:
Sharp corners at the front cutting edge are replaced with curved transitions having a controlled radius of curvature larger than 0.1mm. This curvature eliminates stress concentration points while maintaining the precision cutting capability, as the curved geometry still provides the necessary cutting angles and edge definition for accurate machining.
Data Source
AI summary
An end mill for metal cutting including a body, the body having a cutting section extending axially rearward from a front end. The cutting section includes a plurality of radially protruding and axially extending teeth. Each tooth has a front cutting edge, wherein the front cutting edge extends axially rearward and radially outward from an axially most forward point of the respective cutting edge. When the body is rotated, the cutting edge of each tooth forms a line of intersection in a central plane containing the central longitudinal axis. Each front cutting edge is interrupted by at least two chip splitting grooves, such that the line of intersection of the front cutting edge with the interrupting chip splitting grooves includes outer crests, each being located on an imaginary convex curve, at least two inner troughs, and curve parts, extending from one respective trough to one respective axially closest crest.