Bonded Abrasive Tools with High Porosity and Strength
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Solution Overview
Problem
Conventional bonded abrasive tools with organic bonds face challenges in achieving high porosity without sacrificing mechanical strength or tool life, as existing methods predict grinding performance based on tool grade and structure, making it difficult to manufacture tools with high volume percentages of porosity using traditional methods.
Innovation Solution
The development of bonded abrasive tools with a three-dimensional composite structure featuring agglomerated abrasive grains and a continuous porosity phase, allowing for high porosity percentages (above 30 volume %) without compromising mechanical strength or tool performance, by using agglomerated abrasive grains with organic or inorganic binding materials, which alter the elastic modulus and physical properties of the tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high volume percentages of porosity are achieved in bonded abrasive tools with organic bonds, then grinding efficiency and protection from thermal damage are improved, but mechanical strength and tool life are sacrificed
Solution Approach 1:
The patent applies porous materials by incorporating pore inducers (such as hollow glass spheres, foam glass particles, or organic pore inducers) into the abrasive composite mixture during manufacturing. This creates controlled porosity within the tool structure that allows for improved grinding efficiency and thermal management while maintaining mechanical integrity through the specific design and distribution of pores throughout the composite matrix
Solution Approach 2:
The patent uses composite materials by combining organic bond materials with inorganic fillers, abrasive grains, and pore inducers to create a multi-phase composite structure. This composite approach allows the tool to simultaneously achieve high porosity for grinding efficiency, mechanical strength from the organic-inorganic composite matrix, and thermal management capabilities through the interconnected pore network
2Quantity of substance
If high volume percentages of porosity are achieved in bonded abrasive tools, then fluid flow and swarf removal are improved, but the sum of constituents must equal 100 volume percent, requiring proportionally lower bond and abrasive grain content
Solution Approach 1:
The patent applies parameter changes by systematically varying the volume percentages of abrasive grain, bond, and porosity constituents to achieve target porosity levels (40-70 volume %) while maintaining consistent tool performance. This involves calculating precise batch weights of components based on desired final tool volume and relative volumetric percentages, ensuring manufacturing consistency across different porosity levels
3Productivity
If very porous abrasive composites are made with larger grain sizes and organic bond materials, then porosity can be increased, but the composite tends to slump or stratify during molding and curing stages
Solution Approach 1:
The patent applies preliminary action by pre-mixing pore inducers, abrasive grains, and bond materials in precisely calculated proportions before molding. This preliminary preparation ensures uniform distribution of all constituents throughout the green composite, preventing slumping and stratification during subsequent molding and curing operations, and enabling consistent manufacturing of high-porosity tools
Solution Approach 2:
The patent uses specific pore inducer materials (hollow glass spheres, foam glass particles, organic pore inducers) that maintain structural integrity during molding and curing while creating the desired porosity. These engineered porous materials prevent composite slumping by providing structural support during manufacturing while achieving the target porosity levels in the final cured tool
Data Source
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AI summary
Bonded abrasive tools, having novel porous structures that are permeable to fluid flow, comprise a relatively low volume percentage of abrasive grain and bond, and a relatively low hardness grade, but are characterized by excellent mechanical strength and grinding performance. Methods for making the abrasive tools utilizing agglomerated abrasive grain are described.