Eccentric Drill Bit Blade for Faster Hard-Material Drilling
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Solution Overview
Problem
Existing drill bits for hard materials face reduced drilling speed due to symmetrical blade edges maintaining a large contact area, leading to decreased pressure and precision, and increased blade depletion when attempting to increase pressure by reducing thickness or sharpness.
Innovation Solution
An eccentric drill bit blade with a laterally biased tip point and angled blade edges, where the angular bisector is inclined relative to the axis of rotation, ensuring both sides of the axis of rotation contact the workpiece, increasing pressure and counteracting lateral components for improved precision and life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If symmetrical blade edges are used, then the contact area between blade edges and workpiece is maintained, but the pressure between blade edge and workpiece decreases, reducing drilling speed
Solution Approach 1:
The patent applies asymmetry by designing the blade with an eccentric tip point that is laterally biased relative to the axis of rotation, and by setting the angular bisector between the two blade edges at an inclination angle relative to the axis of rotation. This asymmetric configuration ensures that during rotation, only a portion of each blade edge contacts the workpiece at any given time, reducing the contact area and increasing the pressure intensity at the contact points, thereby improving drilling speed without compromising blade life
2Productivity
If blade thickness is reduced or blade edge sharpness is increased to increase pressure, then drilling speed increases, but blade depletion occurs faster
Solution Approach 1:
The asymmetric blade design with eccentric tip point and inclined angular bisector distributes the cutting load more effectively. By ensuring that both sides of the axis of rotation contact the workpiece during rotation, the design maintains increased pressure intensity while sharing the load across both blade edges, preventing rapid depletion and extending blade life
3Productivity
If eccentric blade design with one-sided pressure is used, then drilling speed increases, but drilling precision decreases due to one-sided lateral component
Solution Approach 1:
The patent resolves the precision issue by carefully designing the asymmetry such that the angular bisector is inclined at a specific angle relative to the axis of rotation. This configuration ensures that during rotation, both sides of the axis of rotation contact the workpiece, generating lateral components that counterbalance each other, thereby maintaining drilling precision while still achieving increased pressure and drilling speed
Data Source
AI summary
A drill bit for drilling a hard material includes a drill bit blade defining an axis of rotation and including a first side and a second side positioned respectively on first and second lateral sides of the axis of rotation. The drill bit blade further includes a blade tip point that is laterally biased relative to the axis of rotation, and a first blade edge and a second blade edge starting at the blade tip point and ending at the first side and second side, respectively. An angular bisector between the first and second blade edges is inclined at an angle relative to the axis of rotation.