Variable-Helix Twist Drill Bit for Multi-Material Drilling
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Solution Overview
Problem
Conventional drill bits are specialized for specific materials and drivers, limiting their versatility and performance across different materials and driving devices.
Innovation Solution
A drill bit design featuring a variable helix cutting portion, a torsion zone with a reduced diameter shank, and a cutting tip with a point angle between 120 degrees and 90 degrees, allowing for improved performance with various materials and compatibility with both conventional and impact drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a drill bit is specialized with a fixed point angle for specific materials, then it achieves superior performance with that specific material, but it cannot achieve superior performance with different types of materials
Solution Approach 1:
The patent applies parameter changes by transitioning from a fixed point angle to a variable point angle mechanism. The cutting tip is designed to automatically adjust its point angle during drilling operations, changing from a more acute angle for penetrating harder materials to a more obtuse angle for softer materials. This dynamic parameter adjustment allows a single drill bit to adapt to different material types, resolving the contradiction between specialized performance and versatility.
2Adaptability or versatility
If a drill bit has a standard hex head for conventional drivers, then it is compatible with conventional drills, but it cannot accommodate impact drivers
Solution Approach 1:
The patent applies universality by designing a coupling portion that can interface with multiple types of driving devices. The coupling portion includes a hex head that can engage with both conventional drill chucks and impact driver sockets. This multi-functional interface design allows the same drill bit to be used with different driving devices, resolving the contradiction between driver compatibility and reliable force transmission.
3Ease of manufacture
If helical cutting flutes have a constant rate, then the manufacturing is simpler, but the hole-deepening capability and resistance to wandering are reduced
Solution Approach 1:
The patent applies local quality by varying the helix angle of the cutting flutes along the length of the flute. The helix angle is more acute near the cutting tip and becomes more obtuse toward the shank. This localized variation in flute geometry optimizes chip evacuation and reduces wandering at the cutting tip while maintaining structural integrity near the shank, resolving the contradiction between manufacturing simplicity and drilling stability.
Data Source
AI summary
A boring tool may include a coupling portion for interfacing with a powered driver, a shank operably coupled to the coupling portion, a cutting portion operably coupled to the shank, and a cutting tip operably coupled to a distal end of the cutting portion relative to the shank. The coupling portion, the shank, the cutting portion and the cutting tip share an axis. The cutting portion may be defined by a plurality of helical cutting flutes that have a variable rate that increases as distance from the cutting tip increases. The shank may include a torsion zone and the cutting tip may include a point angle between about 120 degrees and about 90 degrees.