Shaped Vitrified Abrasive Agglomerates for Consistent Cut-Rates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Abrasive tools experience inconsistent cut-rates over their lifespan, leading to limited useful life and potential for out-of-specification finishes or workpiece burn, particularly when dealing with materials of Rockwell C hardness 20 or less.
Innovation Solution
The development of shaped abrasive agglomerates comprising fused aluminum oxide mineral bonded in a vitreous matrix, with a frusto-pyramidal shape and specific taper angles, which provide consistent material removal rates and extended tool life without the need for superabrasive grains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional abrasive tools are used on materials with Rockwell C hardness of 20 or less, then initial cutting performance is achieved, but cut-rate becomes inconsistent and tool life is limited
Solution Approach 1:
The patent changes the physical and chemical parameters of the abrasive mineral by fusing aluminum oxide at controlled temperatures to create a vitrified matrix with specific hardness and microstructure. This transformation enables consistent material removal rates and extended tool life when abrading softer materials (Rockwell C hardness 20 or less) by optimizing the balance between abrasive hardness and bond strength.
Solution Approach 2:
The patent creates a composite abrasive agglomerate consisting of fused aluminum oxide mineral particles embedded in a vitrified matrix. This composite structure combines the cutting ability of the abrasive mineral with the bonding and structural stability of the glassy matrix, resulting in consistent cut-rates and extended tool life without requiring superabrasive grains.
2Productivity
If superabrasive grains are used to maintain consistent cut-rates, then productivity is improved, but cost and complexity increase
Solution Approach 1:
Instead of using superabrasive grains (diamond, cubic boron nitride), the patent transforms conventional aluminum oxide into a fused vitrified form with optimized physical parameters. The fusion process creates a material with controlled hardness, porosity, and microstructure that delivers consistent cut-rates on softer materials without the complexity and cost of superabrasives.
Solution Approach 2:
The patent uses conventional, cost-effective aluminum oxide mineral that can be fused into a disposable abrasive agglomerate. Rather than investing in expensive superabrasive grains, the invention creates an economical abrasive that maintains consistent performance through its fused vitrified structure, replacing the need for costly superabrasive materials.
3Duration of action of moving object
If abrasive tools are designed for extended life, then durability is improved, but initial cutting performance may be compromised
Solution Approach 1:
The fusion process creates a vitrified matrix with optimized parameters that balance durability and cutting performance. The controlled cooling and crystallization during vitrification produce a microstructure with appropriate porosity and bond strength, enabling the abrasive to maintain consistent cut-rates throughout extended tool life without sacrificing initial cutting ability.
Solution Approach 2:
The composite structure of fused aluminum oxide in a vitrified matrix provides both the hardness needed for effective cutting and the structural integrity for extended service life. The glassy matrix binds the abrasive particles while allowing controlled fracture and exposure of fresh cutting edges, achieving both durability and consistent productivity.
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
These agglomerates achieve stable and extended cut-rates, maintaining consistent performance throughout the tool's life, even with softer materials, by optimizing the microstructure and chemical properties of the abrasive mineral.
Implementation Method 1
fused aluminum oxide mineral bonded in a vitreous matrix
Implementation Method 2
moving the workpiece and the abrasive article relative to each other to abrade the workpiece
Data Source
AI summary
An abrasive agglomerate particle includes fused aluminum oxide mineral bonded in a vitreous matrix. The fused aluminum oxide mineral is present in a range from 70 percent by weight to 95 percent by weight and the vitreous matrix is present at least at five percent by weight, based on the weight of the abrasive agglomerate particle. The fused aluminum oxide mineral has an average particle size of up to 300 micrometers, and the abrasive agglomerate particle has a frusto-pyramidal shape with side walls having a taper angle in a range from 2 to 15 degrees and a dimension of at least 400 micrometers. The abrasive agglomerate particles are useful in abrasive articles. The method includes contacting the workpiece with an abrasive article and moving the workpiece and the abrasive article relative to each other to abrade the workpiece.