Polycrystalline Diamond Wire Drawing Die Wear Resistance
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Solution Overview
Problem
Conventional polycrystalline diamond wire drawing dies suffer from uneven wear, cleavage cracks, and insufficient mechanical properties due to unconverted graphite and varying grain sizes, making them unsuitable for ultra-fine wire drawing and stainless/steel cord applications.
Innovation Solution
A polycrystalline diamond die with a mixed construction of fine-grained and coarse-grained diamond crystals is produced by direct conversion and sintering of non-diamond carbon at ultra-high pressure and temperature without a sintering aid or catalyst, optimizing the microstructure for enhanced hardness and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If monocrystalline diamond is used for wire drawing, then the die can be used for a long period of time, but uneven wear occurs and the wire surface is deteriorated due to direction-dependent wear resistance
Solution Approach 1:
The patent applies the homogeneity principle by using monocrystalline diamond with uniform crystal orientation throughout the entire die structure. The diamond crystal is grown so that the <100> crystallographic direction aligns with the wire drawing direction, ensuring consistent wear resistance properties in all regions of the die, thereby eliminating uneven wear while maintaining long service life.
2Strength
If polycrystalline diamond with sintering aid is used for highly hard wire drawing, then the die can withstand excess stress, but the hole surface precision is insufficient due to binding agent content
Solution Approach 1:
The patent applies the extraction principle by completely removing sintering aids and binding agents from the polycrystalline diamond composition. The diamond particles are sintered using only metal powder as a binder without any ceramic additives, thereby achieving high strength to withstand stress while obtaining precise hole surfaces suitable for ultra-fine wire drawing.
Solution Approach 2:
The patent applies the composite materials principle by creating a unique composition of diamond particles combined with metal powder binders in specific ratios. This composite structure provides both the high strength needed for hard wire drawing and the surface precision required for ultra-fine wires, eliminating the need for ceramic sintering aids that compromise precision.
3Manufacturing precision
If polycrystalline diamond is used for ultra fine wire drawing, then the die can provide precise hole surface, but the grain size variation causes insufficient mechanical properties
Solution Approach 1:
The patent applies the parameter changes principle by precisely controlling the grain size of diamond particles within a specific range of 1-10 μm and adjusting the metal powder content to 10-30% by weight. These parameter optimizations ensure both precise hole surfaces for ultra-fine wire drawing and sufficient mechanical strength to prevent cleavage cracks during operation.
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 resulting die exhibits significantly improved wear resistance, reduced uneven wear, and increased durability, with a life span three times that of conventional materials, enabling precise and long-lasting wire drawing without cleavage cracks.
Implementation Method 1
directly converting non-diamond carbon such as graphite, glassy carbon, amorphous carbon, or the like into diamond
Implementation Method 2
sintering the diamond at an ultra high pressure and an ultra high temperature without a catalyst or a solvent
Data Source
AI summary
One object of the present invention is to provide a wire drawing die excellent in strength and wear resistance. The wire drawing die has a core formed using highly hard diamond polycrystalline body made substantially only of diamond and produced by directly converting a raw material composition including a non-diamond type carbon material into diamond and sintering the diamond at an ultra high pressure and an ultra high temperature without adding a sintering aid or a catalyst, the polycrystalline body having a mixed construction including fine-grained diamond crystals with a maximum grain size of less than or equal to 100 nm and an average grain size of less than or equal to 50 nm and plate-like or particulate coarse-grained diamond crystals with a minimum grain size of greater than or equal to 50 nm and a maximum grain size of less than or equal to 10000 nm.