Drill With Convex-Arc Cutting Edges Reducing Chip Clogging
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Solution Overview
Problem
Conventional drills experience chip clogging and increased cutting resistance due to prolonged contact time with the work material, leading to suboptimal machining accuracy and efficiency.
Innovation Solution
The drill features convex-arc cutting edges with thinnings, flutes, and specific margin configurations, including second, third, and fourth faces, which widen the chip discharge region and reduce cutting resistance, enhancing chip discharge performance and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cutting edge contact time with work material is prolonged to improve machining accuracy, then machining precision is improved, but chip clogging occurs and cutting resistance increases
Solution Approach 1:
The cutting edge is segmented into multiple convex-arc cutting edges with thinnings between them, creating discrete cutting zones that reduce continuous contact time and improve chip discharge while maintaining machining precision
Solution Approach 2:
The invention introduces a multi-dimensional face structure (second, third, and fourth faces) that extends the chip discharge region in multiple directions, allowing chips to be evacuated more efficiently without compromising the precision of the cutting action
2Force
If thinning is performed to decrease biting load and thrust load, then cutting resistance is reduced, but chip clogging occurs due to prolonged contact time
Solution Approach 1:
Thinnings are applied locally between specific convex-arc cutting edges rather than uniformly across the entire cutting edge, reducing cutting resistance at critical zones while maintaining sufficient contact time and quality in other areas
Solution Approach 2:
The asymmetric arrangement of thinnings and convex-arc cutting edges creates varied contact patterns that reduce overall cutting resistance while ensuring adequate machining quality through strategic placement of cutting zones
3Manufacturing precision
If convex-arc cutting edges are formed to disperse cutting resistance, then machined face quality is improved, but chip clogging occurs and cutting resistance increases
Solution Approach 1:
The convex-arc cutting edges are segmented and separated by thinnings, dispersing the cutting resistance across multiple discrete zones rather than concentrating it along a continuous edge, thereby reducing overall cutting resistance while maintaining face quality
Solution Approach 2:
The convex-arc shape of cutting edges provides curved cutting paths that naturally disperse cutting resistance, while the combination with thinnings and multi-dimensional faces optimizes both face quality and chip discharge
Data Source
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AI summary
A drill of the present invention includes: a drill main body; a plurality of convex-arc cutting edges which are formed on a tip side of the drill main body from an outer periphery of the drill main body to a chisel edge provided near to a rotational axis; second faces which are each formed in an approximately band shape and are each formed along each of the convex-arc cutting edges on a back side of the convex-arc cutting edge in the rotational direction; third faces which are each formed to be continuous with a back side of each of the second faces in the rotational direction; and fourth faces which are each formed to be continuous with a back side of each of the third faces in the rotational direction.