Diamond-Coated Cutting Edge With Zoned Protrusion Density
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Solution Overview
Problem
Existing diamond-coated cutting tools face challenges in achieving optimal cutting performance due to issues with surface roughness, frictional heat, and wear resistance, particularly in regions near the cutting edge.
Innovation Solution
A coated tool design featuring a diamond coating with specific dome-shaped protrusions on its surface, where the number and size of protrusions vary across different regions of the tool, optimizing surface roughness and frictional properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the diamond coating surface is made smooth to improve machining quality, then surface roughness is reduced, but wear resistance and frictional properties deteriorate
Solution Approach 1:
The patent applies local quality by creating different surface characteristics in different regions of the diamond coating. The first region (300 μm from cutting edge) has fewer protrusions for smooth machining, while the second region (300-800 μm from cutting edge) has more protrusions for reduced friction and heat generation. This spatial variation in surface quality resolves the contradiction between smoothness and wear resistance.
Solution Approach 2:
The diamond coating surface is segmented into distinct regions with different protrusion densities. By dividing the coating area and assigning different functional characteristics to each segment, the patent simultaneously achieves smooth machining in one segment and improved wear resistance in another, resolving the inherent contradiction.
2Reliability
If dome-shaped protrusions are increased to reduce frictional heat, then wear resistance improves, but machining smoothness deteriorates
Solution Approach 1:
The patent uses local quality to place protrusions strategically - concentrating them in the second region where they provide friction reduction and heat dissipation, while keeping the first region relatively smooth for quality machining. This localized distribution allows both functions to coexist without mutual interference.
Solution Approach 2:
By segmenting the coating into regions with different protrusion densities, the patent enables the protrusions to perform their friction-reducing function without compromising the smoothness required for high-quality machining surfaces.
3Reliability
If the number of protrusions is increased to enhance frictional properties, then wear resistance improves, but the cutting edge quality deteriorates
Solution Approach 1:
The patent applies local quality by restricting high-density protrusions to the second region away from the cutting edge, while maintaining low protrusion density in the first region near the cutting edge. This ensures cutting edge quality is preserved while still providing wear resistance through protrusions in the appropriate location.
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
The tool achieves improved machining smoothness, reduced frictional heat, enhanced wear resistance, and extended tool life, while maintaining excellent peeling resistance and cutting performance.
Implementation Method 1
reduced frictional heat
Implementation Method 2
enhanced wear resistance
Implementation Method 3
diamond coating located on the base body
Data Source
AI summary
A coated tool includes a base body and a diamond coating. The coated tool has a cutting edge. The first surface comprises a first region close to the cutting edge and a second region further away from the cutting edge than the first region. The diamond coating comprises an outer surface having dome-shaped protrusions. The protrusions include first protrusions having an equivalent circle diameter of 6 μm or more located in the first region, and second protrusions having an equivalent circle diameter of 6 μm or more located in the second region. A number of the first protrusions per 1 mm2 is a first protrusion number. A number of the second protrusions per 1 mm2 is a second protrusion number. The first protrusion number is 30 or less, and the second protrusion number is larger than the first protrusion number.