Complex-Shaped Abrasive Grains for Chip Clearance and Surface Finish
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Solution Overview
Problem
Existing methods for forming structured abrasive articles are unreliable and suffer from performance limitations, including binder sticking issues and poor mechanical characteristics, leading to reduced abrasive article life and increased costs due to frequent replacements.
Innovation Solution
The development of shaped abrasive grains with complex geometries and high aspect ratios, including asymmetric and three-dimensional designs, which are formed using a process involving a binder formulation coated on a backing and cured with energy sources like thermal or actinic radiation, ensuring improved orientation and retention on the backing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If finer grain abrasive articles are used to produce smoother surfaces, then surface quality is improved, but stock removal rate decreases
Solution Approach 1:
The abrasive article is segmented into multiple layers with different grain sizes and functions. The first layer contains coarser grains for stock removal, while the second layer contains finer grains for surface finishing. This segmentation allows both high stock removal rate and smooth surface quality to be achieved by combining the functions of different layers.
Solution Approach 2:
The invention transitions from using a single layer of uniform grain size to a multi-layer structure with varying grain sizes and compositions. This dimensional change in the abrasive article structure enables simultaneous optimization of both material removal efficiency and surface finish quality.
2Shape
If traditional binders with high filler loading are used to form structured abrasive articles, then structure formation is enabled, but mechanical characteristics deteriorate
Solution Approach 1:
The binder formulation uses a composite system combining thermoplastic and thermosetting polymers. The thermoplastic component (e.g., polyacrylic acid) provides flexibility and adhesion, while the thermosetting component (e.g., polyethylene glycol diacrylate with benzoyl peroxide) provides structural integrity and strength. This composite approach maintains good mechanical characteristics while enabling structured abrasive article formation.
Solution Approach 2:
The binder formulation parameters are optimized by controlling the ratio of thermoplastic to thermosetting components, adjusting crosslinking density, and modifying molecular weight distribution. These parameter changes allow the binder to simultaneously provide adequate mechanical strength and facilitate structured article formation without excessive filler loading.
3Shape
If typical patterning processes are used to form structured abrasive articles, then surface structures are created, but reliability decreases due to binder sticking
Solution Approach 1:
The binder formulation acts as an intermediary between the abrasive grains and the backing paper. By using a specifically designed binder with optimized adhesion properties and controlled viscosity, the system achieves reliable grain retention without binder sticking to patterning tools, thereby improving process reliability while maintaining structured article formation.
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 shaped abrasive grains exhibit enhanced grinding performance and longer life, reducing replacement costs and improving surface quality by maintaining high stock removal rates while ensuring better chip clearance and coolant flow in abrasive applications.
Implementation Method 1
coated on a backing and cured with energy sources like thermal or actinic radiation
Implementation Method 2
cured with energy sources like thermal or actinic radiation
Data Source
AI summary
An abrasive grain is disclosed and may include a body. The body may include a central portion and 3 radial arms extending outwardly from the central portion along the entire length of the central portion of the body. A first radial arm, a second radial arm, and a third radial arm can define a total angle of less than 180 degrees. The body may also include at least one groove extending from a base surface along a first side of the body.