Planar Rake Fluted Drill Bit for Better Chip Removal
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Solution Overview
Problem
Existing fluted drill bits, particularly twisted or helical bits, have curved cutting edges and flutes with concave cross sections that reduce cutting efficiency and effectiveness, especially when drilling through various materials.
Innovation Solution
A drill bit design featuring planar rake sections and flutes, fabricated from a unitary drill blank, with optional coatings and materials like low carbon steel, tungsten carbide, and coatings, and a manufacturing process involving machining to create linear cutting edges and helical flutes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a twisted or helical drill bit with curved cutting edges is used, then the drill bit can be manufactured from cylindrical stock, but the cutting efficiency and effectiveness deteriorates
Solution Approach 1:
The drill bit is divided into distinct functional sections: a planar rake section with linear cutting edge and a fluted section with helical flutes. This segmentation allows each section to perform its specific function optimally - the planar section provides efficient cutting while the fluted section provides chip removal, resolving the contradiction between manufacturability and cutting efficiency.
Solution Approach 2:
Different sections of the drill bit are given different geometric properties - the rake section has a planar surface with linear cutting edge for optimal cutting, while the fluted section has helical grooves for chip removal. This local differentiation allows each part to have the quality needed for its specific function, improving overall cutting efficiency while maintaining manufacturability.
2Device complexity
If a curved cutting edge with concave cross section is used, then the drill bit structure is simplified, but the cutting performance deteriorates
Solution Approach 1:
The drill bit is divided into distinct functional sections: a planar rake section with linear cutting edge and a fluted section with helical flutes. This segmentation allows each section to perform its specific function optimally - the planar section provides efficient cutting while the fluted section provides chip removal, resolving the contradiction between manufacturability and cutting efficiency.
Solution Approach 2:
Different sections of the drill bit are given different geometric properties - the rake section has a planar surface with linear cutting edge for optimal cutting, while the fluted section has helical grooves for chip removal. This local differentiation allows each part to have the quality needed for its specific function, improving overall cutting efficiency while maintaining manufacturability.
Data Source
AI summary
A constant rake planar cutting edge fluted drill bit and a method of manufacturing the same. The drill bit includes a planar cutting face formed at the tip end of the bit by a motion of a rotating machining wheel respective to a stationary blank in a first step. Once the cutting face is formed, the blank is rotated and translated in a direction parallel to an elongated axis, during which the rotating machining wheel creates a flute. Upon completion of the first flute, the bit is rotated accordingly and the processes are repeated to create each subsequent planar cutting face and respective flute. The process can also be completed in a slightly modified version of a reverse process, fabricating a flute prior to formation of the planar cutting face of the bit.