Blended Sol-Gel Abrasive Tools for Porous Structure
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Solution Overview
Problem
Existing abrasive tools using 100% filamentary sol-gel alumina grains are not friable enough and costly, while blending with non-filamentary grains compromises structural openness and surface finish in grinding operations.
Innovation Solution
Developing bonded abrasive tools with a blend of agglomerated filamentary sol-gel alumina abrasive grains and agglomerated abrasive grain granules, which form a highly porous and permeable structure, maintaining surface finish quality and structural openness, and adjusting grain blend contents to optimize friability or toughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If 100% filamentary sol-gel alumina grains are used, then grinding performance and surface finish quality are improved, but cost increases and friability decreases
Solution Approach 1:
The patent applies local quality by using filamentary grains specifically in regions where surface finish quality is critical, while using conventional grains in other areas. This allows the tool to achieve high surface finish quality where needed without incurring the full cost of 100% filamentary grains throughout the entire structure.
Solution Approach 2:
The patent creates a composite abrasive tool structure combining filamentary sol-gel alumina grains with conventional abrasive grains. This composite approach allows the tool to benefit from the superior surface finish properties of filamentary grains while reducing costs by incorporating more economical conventional grains in appropriate proportions and locations.
2Manufacturing precision
If 100% filamentary sol-gel alumina grains are used, then surface finish quality is improved, but the abrasive tool becomes less friable
Solution Approach 1:
The patent applies local quality by using filamentary grains specifically in regions where surface finish quality is critical, while using conventional grains in regions where friability is more important. This spatial differentiation allows the tool to exhibit both high surface finish quality in contact zones and appropriate friability in structural zones.
Solution Approach 2:
The patent creates a composite abrasive tool structure combining filamentary sol-gel alumina grains with conventional abrasive grains. The filamentary grains provide surface finish quality, while the conventional grains contribute to friability, achieving a balance between these opposing properties through material composition.
3Ease of manufacture
If conventional abrasive grain granules are used, then cost is reduced, but structural openness and surface finish quality are compromised
Solution Approach 1:
The patent applies local quality by strategically placing conventional grains in regions where cost reduction is prioritized and filamentary grains in regions where surface finish quality is critical. This localized distribution optimizes the cost-performance ratio by matching material properties to functional requirements.
Solution Approach 2:
The patent creates a composite abrasive tool structure combining conventional abrasive grains with filamentary sol-gel alumina grains. This composite approach allows the tool to achieve acceptable surface finish quality while reducing costs compared to 100% filamentary grain construction, by utilizing the complementary properties of both grain types.
4Strength
If a blend of agglomerated filamentary and conventional grains is used, then friability is improved, but maintaining structural openness becomes challenging
Solution Approach 1:
The patent applies local quality by using agglomerated structures with controlled internal porosity in specific regions. The agglomerates are designed with hierarchical pore structures that maintain fluid permeability while incorporating both filamentary and conventional grains to achieve desired friability characteristics in contact zones.
Solution Approach 2:
The patent employs porous agglomerated grain structures that maintain high fluid permeability and structural openness. The agglomerates are constructed with controlled porosity (35-80 volume percent) that allows cooling fluid passage and swarf removal while accommodating a blend of filamentary and conventional grains to achieve optimal friability.
5Productivity
If porosity is increased to improve swarf removal and cooling, then grinding efficiency is improved, but structural strength decreases
Solution Approach 1:
The patent employs porous agglomerated grain structures with controlled porosity levels (35-80 volume percent) that optimize both grinding efficiency and structural strength. The hierarchical pore structure within agglomerates facilitates effective swarf removal and cooling fluid passage while the agglomerated construction itself provides structural integrity.
Solution Approach 2:
The patent creates a composite structure where porous agglomerates containing blended filamentary and conventional grains work together to balance porosity-related functions with structural requirements. The combination of grain types and agglomerated construction allows the tool to maintain adequate strength despite high porosity levels needed for efficient grinding.
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 blended abrasive tools achieve high metal removal rates, longer wheel life, reduced metallurgical damage, and improved grinding performance without compromising surface finish or structural openness, making them suitable for deep cut and precision grinding processes.
Implementation Method 1
the volume percent of interconnected porosity or fluid permeability has been found to be a significant determinant of grinding performance of abrasive tools. The interconnected porosity allows removal of grinding waste (swarf) and passage of cooling fluid within the wheel during grinding.
Implementation Method 2
The agglomerated abrasive grain granules include a plurality of abrasive grains held in a three-dimensional shape by a first binding material and the agglomerates of the filamentary sol-gel alumina abrasive grain are held by a second binding material.
Data Source
AI summary
A bonded abrasive tool comprises a blend of abrasive grains, a bond component and porosity. The blend of abrasive grains comprises agglomerates of filamentary sol-gel alumina abrasive grain held by a binding material and agglomerated abrasive grain granules including a plurality of abrasive grains held by a binding material. The filamentary sol-gel alumina abrasive grain has a length-to-cross-sectional-width aspect ratio of at least 2:1, and the abrasive grains in the agglomerated abrasive grain granules have a length-to-cross-sectional-width aspect ratio of about 1.0. The bonded abrasive tool has a porosity of about 35 to 80 volume percent. A method of making such a bonded abrasive tool as described above is also disclosed.