Multi-Coated Metal Drill for Higher Feed Rate and Tool Life
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Solution Overview
Problem
Conventional metal drills lack the versatility and longevity to efficiently machine a wide range of metallic workpieces due to limited surface hardness and friction issues, leading to reduced feed rate and service life.
Innovation Solution
The metal drill features at least two different functional coatings, such as titanium nitride and aluminum titanium nitride, applied to specific regions or diffused into the surface zone to enhance surface hardness and reduce friction, combined with a polygonal drive section and a cutting head with spiral flutes for improved guidance and coolant supply, along with a unique marking for material identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metal drills are used without functional coatings, then the device structure remains simple and cost-effective, but the surface hardness is insufficient leading to reduced service life and feed rate
Solution Approach 1:
The patent applies different functional coatings to different regions of the drill bit based on specific functional requirements. The cutting edge receives a coating optimized for cutting performance while the shaft receives a coating optimized for durability and friction reduction. This regional differentiation resolves the contradiction by providing enhanced reliability only where needed rather than uniformly across the entire tool.
Solution Approach 2:
The patent employs multiple functional coatings with different material properties applied to the same drill bit. These composite coating structures provide both the hardness needed for extended service life and the friction-reducing properties needed for improved feed rate, resolving the contradiction between reliability and the complexity of having multiple coating layers.
2Productivity
If conventional metal drills are used without functional coatings, then the manufacturing process remains simple, but the surface hardness is insufficient leading to reduced feed rate
Solution Approach 1:
The patent applies friction-reducing coatings specifically to regions where contact occurs during operation, such as the cutting edge and shaft surfaces. This localized approach improves feed rate by reducing friction only where it impacts productivity, while keeping the manufacturing process simpler than if the entire tool were coated uniformly.
Solution Approach 2:
The patent modifies surface properties through functional coatings that change the friction parameters of the drill bit surfaces. By altering the surface chemistry and physics through coating application, the feed rate is improved without requiring fundamental changes to the manufacturing process itself.
3Adaptability or versatility
If a single functional coating is applied to the metal drill, then the manufacturing process is simple, but the versatility to machine different metallic materials is limited
Solution Approach 1:
The patent applies different functional coatings to different regions of the drill bit based on specific functional requirements. The cutting edge receives a coating optimized for cutting performance while the shaft receives a coating optimized for durability and friction reduction. This regional differentiation resolves the contradiction by providing enhanced reliability only where needed rather than uniformly across the entire tool.
Solution Approach 2:
The patent employs multiple functional coatings with different material properties applied to the same drill bit. These composite coating structures provide both the hardness needed for extended service life and the friction-reducing properties needed for improved feed rate, resolving the contradiction between reliability and the complexity of having multiple coating layers.
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 design significantly increases the feed rate and service life of the metal drill, ensures high dimensional accuracy, and allows efficient machining of various metallic materials by enhancing surface hardness and reducing friction, while the marking facilitates easy selection of the appropriate drill for specific materials.
Implementation Method 1
the application of at least one additional functional layer to the surface of the metal drill
Implementation Method 2
the penetration or diffusion of the chemical substances used for this purpose into a near-surface edge zone
Implementation Method 3
the functional coatings can also have other functions, such as reducing friction
Data Source
AI summary
A metal drill includes a cutting section and a drive section pointing away therefrom. The metal drill has at least two different functional coatings are provided which are designed at least in regions and are designed to permit machining of a metallic workpiece adapted to a respective application material. The drive section has, at least in sections, a polygonal, preferably hexagonal cross-sectional geometry.