Drilling Tool Flank Geometry for Chip Removal
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Solution Overview
Problem
Existing drilling tools require additional machining processes and increased manufacturing time due to thinning, which leads to mechanical stress and prolonged drilling duration.
Innovation Solution
A drilling tool design featuring at least four main cutting edges and flanks with varying clearance angles, where the second flank has a larger clearance angle than the first, allowing for improved chip removal and reduced mechanical stress, thereby eliminating the need for additional thinning processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drilling tool is thinned out to reduce mechanical stress and improve chip removal, then chip removal capability is improved, but additional machining processes are required which increase manufacturing time and cost
Solution Approach 1:
The patent applies local quality by creating different flank geometries with different clearance angles in specific locations. The second flank has a larger clearance angle than the first flank, providing localized chip removal improvement without requiring overall thinning of the tool. This selective geometric modification achieves the thinning effect only where needed for chip evacuation, avoiding additional manufacturing processes.
Solution Approach 2:
The patent introduces a multi-dimensional approach by adding a second flank with different geometric properties (larger clearance angle) adjacent to the first flank. This creates a three-dimensional relief surface structure that provides chip removal capability without requiring reduction of the tool's overall dimensions or additional thinning processes.
2Stress or pressure
If the drilling tool is thinned out to reduce mechanical stress, then stress on the tool is reduced, but additional machining processes are required which increase manufacturing complexity
Solution Approach 1:
The patent reduces mechanical stress through local geometric modification rather than overall thinning. By creating a second flank with larger clearance angle in specific locations, the tool maintains its overall structural integrity and strength while providing localized stress reduction where it is most needed for chip removal, avoiding the complexity of comprehensive thinning processes.
3Strength
If the first flank has a smaller clearance angle to maintain structural integrity, then tool strength is maintained, but chip removal capability is reduced
Solution Approach 1:
The patent resolves this contradiction by applying different clearance angles to different flanks. The first flank maintains a smaller clearance angle to preserve structural integrity, while the second flank has a larger clearance angle to enhance chip removal capability. This localized differentiation allows each flank to optimize for its specific function without compromising the other.
Solution Approach 2:
The patent segments the flank structure into multiple distinct flanks (first flank and second flank) with different geometric properties. This segmentation allows the tool to have different clearance angles in different locations, enabling the first flank to maintain structural integrity while the second flank provides enhanced chip removal, thus resolving the contradiction between strength and productivity.
Data Source
AI summary
The invention relates to a drilling tool for machining, wherein the drilling tool comprises: a main cutter (201, 202), a first flank (206, 207) having a first relief angle, wherein the first flank (206, 207) is designed to abut the main cutter (201, 202), wherein the first flank (206, 207) is designed in a tapered manner starting from the circumference of the drilling tool toward the core of the drilling tool.