Diamond Cutting Edge Composition for Wear and Strength Balance
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Solution Overview
Problem
Existing diamond sintered body tools have insufficient cutting edge strength for cutting difficult materials like cemented carbides, leading to frequent defects and wear issues.
Innovation Solution
A diamond tool with a cutting edge composed of diamond grains that include both a diamond phase and a graphite phase, where the ratio of π* to σ* peak intensities is controlled within specific ranges to balance strength and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a diamond sintered body tool with a graphite layer precipitated on the flank face is used, then wear resistance is improved, but cutting edge strength becomes insufficient
Solution Approach 1:
The patent applies local quality by creating a depth-dependent graphite phase distribution: the surface layer (0-0.5μm) contains graphite phase for lubrication and wear resistance, while the deeper region (0.5μm+) maintains high diamond phase content for strength. This spatial variation in material composition resolves the contradiction between surface wear resistance and overall cutting edge strength.
Solution Approach 2:
The patent uses composite materials by combining diamond phase and graphite phase within the same diamond grain structure. The diamond phase provides hardness and strength, while the graphite phase provides lubrication and wear resistance. This composite structure at the micro-scale allows simultaneous achievement of both strength and wear resistance.
2Reliability
If the diamond phase ratio is increased to improve cutting edge strength, then defect resistance improves, but wear resistance deteriorates
Solution Approach 1:
The patent applies local quality by creating a depth-dependent graphite phase distribution: the surface layer (0-0.5μm) contains graphite phase for lubrication and wear resistance, while the deeper region (0.5μm+) maintains high diamond phase content for strength. This spatial variation in material composition resolves the contradiction between surface wear resistance and overall cutting edge strength.
Solution Approach 2:
The patent uses composite materials by combining diamond phase and graphite phase within the same diamond grain structure. The diamond phase provides hardness and strength, while the graphite phase provides lubrication and wear resistance. This composite structure at the micro-scale allows simultaneous achievement of both strength and wear resistance.
3Duration of action of stationary object
If a graphite layer is added to improve lubrication properties, then wear resistance improves, but device complexity increases
Solution Approach 1:
The patent merges the diamond phase and graphite phase within the same diamond grain structure, eliminating the need for separate graphite coating layers. The graphite phase is integrated into the diamond grain interior and surface, providing lubrication functionality without adding external structural complexity.
Solution Approach 2:
The patent uses composite materials by combining diamond phase and graphite phase within the same diamond grain structure. The diamond phase provides hardness and strength, while the graphite phase provides lubrication and wear resistance. This composite structure at the micro-scale allows simultaneous achievement of both strength and wear resistance.
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 diamond tool achieves improved defect resistance and wear resistance by maintaining sufficient cutting edge strength while utilizing the lubricating properties of the graphite phase.
Implementation Method 1
the lubricating properties of the graphite layer
Implementation Method 2
diamond tools having a cutting edge that is substantially composed of diamond
Data Source
AI summary
A diamond tool includes a diamond at least on a cutting edge includes a diamond phase composed of a diamond crystal structure and a graphite phase composed of a graphite crystal structure. When a ratio Iπ*/Iσ* between an intensity of a π* peak derived from a π bond of carbon in the graphite phase and an intensity of a σ* peak derived from a σ bond of carbon in the graphite phase and a σ bond of carbon in the diamond phase is determined for the diamond grain by measuring an energy loss associated with excitation of K-shell electrons of carbon by electron energy loss spectroscopy, the ratio Iπ*/Iσ* of the diamond grain on a surface of the cutting edge is 0.1 to 2 and a ratio Iπ*/Iσ* of the diamond grain at a depth position of 0.5 μm from the surface of the cutting edge is 0.001 to 0.1.