Elongate Abrasive Particles with Concave Sidewalls
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Solution Overview
Problem
Existing methods for producing elongate abrasive particles struggle with precise control of shape due to curling during extrusion, and there is a need for improved abrasive particle shapes that enhance abrading performance in bonded abrasive articles.
Innovation Solution
The development of elongate ceramic abrasive particles with a concave longitudinal sidewall and fractured ends, created using a method involving a mold with isolated open-ended grooves filled with a ceramic precursor material and volatile liquid, allowing for the formation of dimensionally stable precursor bodies that are then converted into elongate shaped ceramic bodies with enhanced abrasive performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If extrusion method is used to produce elongate abrasive particles, then production efficiency is improved, but shape control precision deteriorates due to curling during extrusion
Solution Approach 1:
The patent extracts the problematic curling effect from the extrusion process by using a different formation method. Instead of forcing material through a die that causes curling, the invention uses a mold cavity method where the abrasive material is formed by filling a predefined cavity space, eliminating the curling issue while maintaining elongate shape capability.
Solution Approach 2:
The patent inverts the traditional extrusion approach by using impression molding instead. Rather than pushing material through a die opening to form the shape, the invention forms the shape by filling a negative cavity and then removing the material from the mold, effectively reversing the formation mechanism to achieve better shape control.
2Reliability
If new abrasive particle shapes are developed to enhance abrading performance, then abrasive effectiveness is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses simple mold cavities that are direct copies or replicas of the desired abrasive particle shape. By creating negative impressions of the target geometry in the mold, the complex elongate shapes with controlled features can be reproduced repeatedly without requiring complex manufacturing equipment or processes.
Solution Approach 2:
The patent achieves different abrasive particle shapes by changing the mold cavity parameters (dimensions, cross-sectional geometry, length) rather than changing the manufacturing process itself. This allows for easy optimization of abrasive effectiveness by simply adjusting mold parameters while keeping the manufacturing method simple and consistent.
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 elongate abrasive particles provide improved abrading performance and can be manufactured using inexpensive off-the-shelf molds, offering enhanced precision and effectiveness in abrasive applications.
Implementation Method 1
removing a sufficient amount of the liquid vehicle to provide a plurality of dimensionally stable elongate precursor bodies
Data Source
AI summary
A bonded abrasive article includes elongate shaped abrasive particles. The elongate shaped abrasive particles comprise an elongate shaped ceramic body having opposed first and second ends joined to each other by at least two longitudinal sidewalls. At least one of the at least two longitudinal sidewalls is concave along its length. At least one of the first and second ends is a fractured surface.