Titanium Alloy Drill Geometry for Lower Cutting Resistance
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Solution Overview
Problem
Drilling titanium alloys with existing drills is challenging due to high cutting resistance, which can lead to drill damage, tool breakage, and slow drilling speeds, posing safety risks and productivity issues when using hand-held tool driving devices.
Innovation Solution
A drill with two to four cutting edges made of cemented carbide or polycrystalline diamond, featuring X-shaped thinning, a rake angle between 30-40 degrees, a clearance angle between 0-8 degrees, and a honed face with a chamfer honing angle between -3 to 8 degrees, designed for use with hand-held tool driving devices to reduce cutting resistance and improve hole quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional drills are used for drilling titanium alloys, then the drill structure is simple and easy to manufacture, but the cutting resistance is high leading to drill damage and slow drilling speeds
Solution Approach 1:
The patent applies different geometric parameters to different parts of the cutting edge. Specifically, the rake angle is set between 30-40 degrees, clearance angle between 0-8 degrees, and honing angle between -3 to 8 degrees. This local optimization of cutting edge geometry reduces cutting resistance while maintaining drill durability, directly resolving the contradiction between drilling speed and drill reliability when drilling titanium alloys.
Solution Approach 2:
The patent changes the geometric parameters of the cutting edge to optimize performance. By setting the rake angle at 30-40 degrees (higher than conventional), clearance angle at 0-8 degrees, and applying chamfer honing with angles between -3 to 8 degrees, the cutting resistance is reduced by approximately 10%. This parameter optimization enables faster drilling speeds while preventing drill damage, resolving the productivity-reliability contradiction.
2Ease of operation
If hand-held tool driving devices are used for drilling titanium alloys, then the operation is flexible, but the high cutting resistance causes tool breakage and safety risks
Solution Approach 1:
The optimized cutting edge geometry with rake angle of 30-40 degrees, clearance angle of 0-8 degrees, and chamfer honing with honing angle of -3 to 8 degrees reduces cutting resistance by approximately 10%. This reduction in cutting resistance directly decreases the harmful forces acting on the drill during hand-held operation, reducing tool breakage risk while preserving the flexibility advantage of hand-held devices.
Solution Approach 2:
The patent converts the inherently high cutting resistance of titanium alloy drilling into a benefit by optimizing the cutting edge geometry. The specific angle ranges (rake: 30-40°, clearance: 0-8°, honing: -3 to 8°) are designed to reduce cutting resistance by approximately 10%, transforming the harmful high-resistance condition into a controlled, safer drilling process that maintains hand-held device flexibility while eliminating excessive tool breakage risks.
3Productivity
If cutting edge geometry is optimized to reduce cutting resistance, then drilling time is reduced, but manufacturing precision of the cutting edge becomes more difficult to achieve
Solution Approach 1:
The patent specifies precise parameter ranges for the cutting edge geometry: rake angle 30-40 degrees, clearance angle 0-8 degrees, and honing angle -3 to 8 degrees. These parameter ranges are optimized to reduce cutting resistance by approximately 10%, thereby reducing drilling time. The use of chamfer honing with these specific angle ranges makes the manufacturing process more controllable and repeatable, balancing the reduction in drilling time with achievable manufacturing precision.
Data Source
AI summary
A drill has two to four cutting edges each made of cemented carbide or polycrystalline diamond. Helical flutes are formed alternately with the cutting edges. X-shaped thinning has been applied to the cutting edges. A rake angle of the cutting edges is not less than 30 degrees and not more than 40 degrees. A clearance angle of the cutting edges is more than 0 degrees and not more than 8 degrees. The cutting edges each has a honed face by chamfer honing. A honing angle of the honed face is not less than −3 degrees and not more than 8 degrees.