Ball End Mill Large-Diameter Arc Edges for Higher Pick Feed
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Solution Overview
Problem
Conventional ball end mills with linear cutting edges struggle to maintain machining efficiency when cutting both planar and curved surfaces, as they often compromise surface roughness, making it difficult to improve efficiency for both surfaces simultaneously.
Innovation Solution
A ball end mill with a ball end cutting edge featuring large diameter edges formed in an arc shape, covering 80% to 120% of the ball radius, which allows for increased pick feed and improved surface roughness on both planar and curved surfaces, while maintaining a contour shape close to an arc, thereby enhancing machining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If linear cutting edges are used in a ball end cutting edge, then machining efficiency is improved, but surface roughness of the machined surface deteriorates
Solution Approach 1:
The ball end cutting edge is divided into multiple linear cutting edges arranged along the arc-shaped rotation locus. This segmentation allows each linear cutting edge to function independently, improving material removal efficiency while the collective arrangement maintains surface quality through distributed cutting action.
Solution Approach 2:
Different regions of the ball end cutting edge are equipped with linear cutting edges having optimized local characteristics. The linear cutting edges are positioned at specific locations along the rotation locus to address local surface quality requirements while maintaining overall machining efficiency.
2Manufacturing precision
If arc-shaped cutting edges with single curvature radius are used, then surface roughness is improved, but machining efficiency deteriorates
Solution Approach 1:
The continuous arc-shaped cutting edge is segmented into multiple linear cutting edges. This segmentation enables the cutting edge to maintain the beneficial surface finishing characteristics of arc-shaped geometry while achieving the material removal efficiency of linear cutting edges through the distributed arrangement of multiple segments.
3Productivity
If linear cutting edges are used to cut curved surfaces, then machining efficiency is improved, but surface roughness deteriorates
Solution Approach 1:
The linear cutting edges are arranged along an arc-shaped rotation locus that follows the curved surface geometry. This curvature alignment allows the linear cutting edges to efficiently remove material from curved surfaces while maintaining surface roughness by conforming to the workpiece geometry.
Solution Approach 2:
The linear cutting edges are positioned at specific locations along the arc-shaped rotation locus to address local surface quality requirements on curved surfaces. This local optimization ensures that each linear cutting edge operates at an optimal angle relative to the curved surface, maintaining both efficiency and surface finish.
Data Source
AI summary
Large diameter edges formed in arc shapes having curvature radii larger than a ball radius are provided. This allows improving surface roughness of a machined surface by cutting of a planar surface with the respective large diameter edges compared with cutting of a planar surface with a ball end cutting edge formed in an arc shape having a single curvature radius. Further, since the respective large diameter edges are formed in the arc shape, compared with cutting of a curved surface with linear cutting edges, surface roughness of a machined surface can be improved by cutting a curved surface with the respective large diameter edges. Accordingly, a pick feed during the cutting of the planar surface and the curved surface with the respective large diameter edges can be increased, and therefore machining efficiency in the cutting of both of the planar surface and the curved surface can be improved.