Vitrified Bonded Abrasive Using Shaped Particles for Precision Grinding
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Solution Overview
Problem
Conventional bonded abrasive articles face challenges in accurately recreating small surface features, particularly sharp tip regions, due to the limitations of using abrasive particles with nominal sizes much smaller than the feature dimensions, leading to difficulties in maintaining precision and accuracy during high precision grinding applications.
Innovation Solution
A vitrified bonded abrasive composition using shaped abrasive particles with a vitreous bond, where the largest dimension of the particles is comparable to or larger than the surface feature, allowing for the creation of surface profiles with features that were previously unachievable using conventional particle sizes, enabling precise grinding and maintaining feature sharpness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional abrasive particles with nominal sizes much smaller than surface feature dimensions are used, then the abrasive article can cover larger surface areas, but it becomes difficult to accurately recreate small surface features particularly sharp tip regions
Solution Approach 1:
The patent changes the critical parameter from particle size to particle shape. By using shaped abrasive particles with specific geometries (needles, plates, blocks) that have dimensions comparable to or larger than the surface features, the invention achieves accurate recreation of small features without requiring extremely fine particle sizes. This parameter shift resolves the contradiction between feature accuracy and particle size constraints.
Solution Approach 2:
The invention uses a composite approach by combining specifically shaped abrasive particles with a vitrified bonding matrix. The shaped particles (needles, plates, blocks) provide the geometric fidelity needed for sharp features, while the vitrified bond provides structural integrity. This composite structure enables accurate surface feature recreation that neither component could achieve alone.
2Manufacturing precision
If abrasive particles are used with nominal sizes much smaller than the feature dimensions, then the abrasive article can be manufactured with conventional methods, but the precision and accuracy during high precision grinding applications deteriorates
Solution Approach 1:
The abrasive particles are pre-shaped into specific geometries (needles, plates, blocks) before being incorporated into the abrasive article. This preliminary shaping ensures that the particles already possess the dimensional characteristics needed for accurate feature recreation, eliminating the need for extremely fine particle sizes and enabling high precision grinding while maintaining manufacturability through controlled particle formation processes.
Solution Approach 2:
The invention transitions from controlling precision through particle size to controlling precision through particle shape. By using shaped particles with dimensions comparable to surface features, the patent achieves high grinding accuracy without requiring conventional fine particle sizes, thus maintaining ease of manufacture while improving precision.
3Strength
If conventional abrasive particles are used, then the abrasive article can maintain structural integrity, but it loses its preferred shape rapidly and grinding power decreases
Solution Approach 1:
The invention creates a composite structure where shaped abrasive particles (needles, plates, blocks) are embedded in a vitrified bonding matrix. The vitrified bond provides strong structural integrity that holds the shaped particles in place, preventing rapid loss of article shape. Meanwhile, the shaped particles maintain their geometric fidelity during grinding, sustaining cutting efficiency and grinding power throughout the article's service life.
Solution Approach 2:
The invention changes the bonding mechanism from organic resin to inorganic vitrified bond, which provides superior structural integrity. This parameter change enables the abrasive article to maintain its shape and grinding power over extended use, resolving the contradiction between structural strength and productivity maintenance.
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 solution allows for the accurate creation and maintenance of small surface features, improving the precision and effectiveness of bonded abrasive articles in high precision grinding applications by using shaped abrasive particles with a vitreous bond, which enhances the grinding performance and maintains feature sharpness.
Implementation Method 1
Another major type are bonded abrasive articles (for example vitrified bonded wheels) in which a vitreous binder system is used to bond the abrasive particles together. These bonds are usually vitrified at temperatures between 700°C to 1500°C.
Implementation Method 2
Bonded abrasive articles for high precision grinding are useful for accurately grinding a workpiece to a desired shape and size.
Data Source
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AI summary
The present invention relates to a bonded abrasive article comprising shaped abrasive particles and a bonding medium comprising a vitreous bond, said shaped abrasive particles each comprising a first side and a second side separated by a thickness t, wherein said first side comprises a first face having a perimeter of a first geometric shape, wherein said thickness t is equal to or smaller than the length of the shortest side-related dimension of the particle, wherein the article exhibits at least on a part of its surface a surface profile comprising at least one surface feature wherein said shaped abrasive particles have a largest dimension of about the same order of magnitude or larger as compared to said surface feature. The present invention also relates to a composition for use of the preparation of a bonded abrasive article, to methods of preparing and using the bonded abrasive article and to methods of grinding and providing a workpiece.