Drill Flank Face Geometry for Hole Accuracy and Strength
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Solution Overview
Problem
Existing drills face challenges in achieving accurate drilling and maintaining drill strength, particularly in terms of hole diameter enlargement and positional tolerance.
Innovation Solution
The drill design incorporates specific flank face configurations, including inclined rear flank face portions and strategically positioned chisel regions, along with controlled distances between ridgelines to enhance cutting performance and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the distance between ridgelines is reduced to improve drilling accuracy, then hole positional tolerance improves, but drill strength decreases
Solution Approach 1:
The patent applies local quality by creating distinct regions with different ridge configurations: the first chisel region has a specific ridge pattern for initial hole positioning, while the second chisel region has a different ridge pattern for maintaining drill strength. This localized differentiation allows each region to optimize for its specific function, resolving the contradiction between positioning accuracy and structural strength.
2Manufacturing precision
If the drill geometry is modified to reduce hole diameter enlargement, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The patent segments the chisel edge into two distinct regions (first chisel region and second chisel region) with different ridge configurations. The first chisel region features ridges oriented in one direction while the second chisel region features ridges oriented in another direction. This segmentation allows each region to perform a specialized function: the first region controls hole positioning while the second region maintains structural integrity, thereby reducing hole diameter enlargement without requiring complete redesign of the entire drill geometry.
Data Source
AI summary
A first flank face includes a first front flank face portion and a first rear flank face portion. A second flank face includes a second front flank face portion and a second rear flank face portion. A ridgeline between the first front flank face portion and the first rear flank face portion is defined as a first ridgeline. A ridgeline between the second front flank face portion and the second rear flank face portion is defined as a second ridgeline. When viewed in the axial direction, a distance between the first ridgeline and the second ridgeline in a direction perpendicular to the first ridgeline is greater than 0 mm and less than or equal to 0.03 mm.