Rotary Drill Free Surface Abrasiveness Gradient
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rotary drilling tools experience mechanical stresses and high wear due to large friction forces at the transition between free surface segments, leading to inefficient cutting operations.
Innovation Solution
The tool features a first free surface segment with lower average abrasiveness (less than 0.1 μm) and a second free surface segment with higher average abrasiveness (between 0.1 μm and 0.4 μm), ground using different abrasive discs, to reduce mechanical stress and wear, allowing independent setting of clearance angles and decoupling of angles between the center-proximal and center-distal regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first free surface segment is ground with the same abrasive disc as the second free surface segment, then the manufacturing process is simpler, but large friction forces occur at the transition region leading to high wear and mechanical loading
Solution Approach 1:
The patent applies different abrasive discs with different grit sizes to different regions of the end surface. The first free surface segment is ground with a finer abrasive disc (lower abrasiveness) while the second free surface segment is ground with a coarser abrasive disc (higher abrasiveness). This local differentiation reduces friction forces at the transition region adjoining the major cutting edge, thereby reducing wear and mechanical loading without complicating the overall manufacturing process
2Productivity
If the first free surface segment has high abrasiveness, then material removal is more efficient, but friction forces increase leading to higher wear and mechanical stress
Solution Approach 1:
The patent differentiates the abrasiveness of different free surface segments based on their functional requirements. The first free surface segment, which adjoins the major cutting edge and experiences high friction, is ground with a finer abrasive disc to reduce friction forces and wear. The second free surface segment, which is less critical for friction reduction, is ground with a coarser abrasive disc to maintain efficient material removal capabilities
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces abrasive stress and mechanical loading, improving wear characteristics and cutting efficiency by minimizing friction forces and allowing for optimized clearance angles.
Implementation Method 1
the two free surface segments are ground with different abrasive discs, wherein the abrasive discs differ in particular with regard to their grit
Data Source
AI summary
A rotary tool, in particular drilling tool, extends along a longitudinal axis and has an end surface; a brad point; and at least one major cutting edge extending outward up to an edge corner. A first free surface segment adjoins the major cutting edge, and a second free surface segment in turn adjoins said first free surface segment. To keep the stress, in particular the wear, low in the region of the end surface, the first free surface segment has a lower average abrasiveness than the second free surface segment.