Fine-Crystalline Diamond Cutting Tool Edge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cutting tools with polycrystalline diamond layers face challenges such as difficulty in sharpening due to heterogeneity, high surface roughness, susceptibility to breakage, and increased cutting forces, making them unsuitable for mass production and causing jaggedness leading to reduced cutting ability and edge-holding.
Innovation Solution
A cutting tool with a synthetic diamond layer consisting of fine-crystalline diamond, where the crystalline domains have an average grain size of ≤500 nm, reducing detachment and internal stresses, and featuring a profile with a reducing layer thickness, which is more homogeneous and economically producible, with optional adhesive and sliding layers for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polycrystalline diamond layers are used, then cutting ability and edge-holding are improved, but heterogeneity of crystalline domains causes difficulty in sharpening and jaggedness
Solution Approach 1:
The patent changes the grain size parameter of the diamond crystallites from micrometer scale (2-100 μm) to nanometer scale (5-500 nm). This parameter transformation maintains the polycrystalline structure's toughness while eliminating the heterogeneity problems, enabling both good edge-holding and ease of sharpening
2Reliability
If polycrystalline diamond layers are used, then cutting ability is improved, but surface roughness increases above rms > 1 μm
Solution Approach 1:
By reducing the crystallite size parameter to nanometer scale (5-500 nm), the patent automatically reduces the surface roughness from micrometer-level irregularities to nanometer-level smoothness (rms < 1 μm), eliminating the need for subsequent polishing while maintaining cutting ability
3Reliability
If polycrystalline diamond layers are used, then cutting ability is improved, but susceptibility to breakage increases due to columnar structure
Solution Approach 1:
The patent changes the grain size parameter from micrometer to nanometer scale, which fundamentally alters the fracture mechanics. The fine-grained structure (5-500 nm) creates more grain boundaries that act as crack barriers, increasing transverse rupture stress while maintaining the toughness needed for cutting ability
4Strength
If monocrystalline diamond is used, then transverse rupture stress is improved, but production difficulty and cost increase
Solution Approach 1:
The patent applies local quality by creating a nanocrystalline structure where each tiny crystallite (5-500 nm) behaves almost like a monocrystal with high strength, while the collective polycrystalline structure enables economical production. This local refinement achieves monocrystal-like strength without monocrystal production difficulty
5Reliability
If polycrystalline diamond layers are used, then cutting ability is improved, but internal mechanical stresses cause distortion and reduced stress at failure
Solution Approach 1:
By reducing the crystallite size to nanometer scale (5-500 nm), the patent minimizes internal stress accumulation. The fine-grained structure distributes mechanical stresses more uniformly across numerous small grains, preventing the macroscopic distortion and stress concentration that occur in coarse-grained polycrystalline diamond
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 fine-crystalline diamond layer significantly reduces detachment and maintains sharpness, enhances edge-holding properties, and increases transverse rupture stress, resulting in a more durable and efficient cutting tool with reduced surface roughness and improved mechanical stability.
Implementation Method 1
the fine-crystalline diamond layer is characterised in that it consists of crystalline domains with an average grain size d50 of ≤500 nm... detachment, as is known of polycrystalline diamond, is quasi-completely suppressed
Implementation Method 2
there is applied, between the substrate and the fine-crystalline diamond layer, at least one first adhesive layer
Implementation Method 3
there is applied, on the fine-crystalline diamond layer, at least one second adhesive layer, and thereupon a sliding layer
Data Source
AI summary
The present invention relates to a cutting tool, in particular in the form of a razor blade, a scalpel, a knife, a machine knife, scissors etc., which has a synthetic diamond layer with a cutting edge. The diamond layer thereby consists of fine-crystalline diamond.