Tapered Guide Bevel Drill Geometry for Lower Wear
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Solution Overview
Problem
Drills experience significant wear and risk of breakage due to high loads during drilling, particularly at the cutting corner and guide bevel, leading to reduced machining efficiency and shortened tool life.
Innovation Solution
A drill design featuring a tapered end section on the guide bevel, where the guide bevel transitions into a free surface that is narrower and separate from the outer surface, reducing contact stress and friction, thereby minimizing wear and extending tool life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide bevel has a constant width along its length, then the drill provides stable guidance during drilling, but the guide bevel experiences high contact stress and friction leading to rapid wear
Solution Approach 1:
The guide bevel transitions from a uniform structure to a non-uniform structure with varying width along its length. The narrower end section experiences reduced contact stress and friction compared to the wider base section, allowing different parts of the guide bevel to have different functional characteristics that optimize both guidance stability and wear resistance
2Duration of action of moving object
If the guide bevel width is reduced to minimize wear, then the contact stress and friction are reduced, but the guidance stability during drilling is compromised
Solution Approach 1:
The guide bevel is designed with non-uniform width where the base section maintains sufficient width for stable guidance while the end section is narrowed to reduce wear. This local differentiation allows the structure to simultaneously achieve both guidance stability and extended tool life without compromising either function
3Reliability
If the guide bevel is made wider to improve guidance, then the guidance stability increases, but the wear and stress on the guide bevel increases leading to shorter tool life
Solution Approach 1:
The guide bevel structure implements local quality differentiation where the base portion maintains larger dimensions for stable guidance while the end portion is narrowed to minimize contact stress and friction. This allows the drill to achieve reliable guidance without subjecting the entire guide bevel to excessive wear and stress
4Reliability
If the cutting corner and guide bevel are reinforced to resist wear, then the wear resistance improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of adding complex reinforcement structures, the invention changes the geometric parameters of the guide bevel by varying its width along the length. This parameter modification achieves wear resistance through optimized stress distribution rather than through structural complexity, maintaining manufacturing simplicity while improving performance
Data Source
AI summary
The invention relates to a drill comprising a body which extends along a longitudinal axis (L) from a rear side (B) to a front side (F), wherein the body comprises a main cutting edge on the front side (F), wherein the body comprises at least one guide bevel which extends in axial direction (A) and toward the front side (F), wherein, toward the front side (F), the guide bevel has an end section which is tapered. The invention further relates to a method for producing such a drill.