Bonded Abrasive Article with High Grain-to-Bond Ratio
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Solution Overview
Problem
Existing bonded abrasive tools require frequent truing and dressing operations to maintain grinding efficiency, especially when working with materials having high fracture toughness, which is time-consuming and inefficient.
Innovation Solution
Development of bonded abrasive articles with a high volume percentage of abrasive particles (VAG) to bond material (VBM) ratio of at least 1.3, using abrasive particles with an average size between 20 to 60 microns, and a metal bond material, allowing for effective grinding without the need for intermediate dressing during consecutive operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional bonded abrasive tools are used, then grinding capability is initially adequate, but frequent truing and dressing operations are required to maintain grinding efficiency
Solution Approach 1:
The patent changes the volume ratio parameter of abrasive grains to bond material from conventional ratios to a ratio of at least 1.3:1. This parameter change creates a self-dressing effect where the high density of abrasive grains allows automatic exposure of fresh cutting edges during grinding, eliminating the need for external truing and dressing operations while maintaining continuous grinding efficiency
Solution Approach 2:
The abrasive tool is designed to be self-dressing through its high abrasive grain density. During normal grinding operation, the tool automatically maintains its own cutting capability without requiring separate dressing operations. The excessive abrasive grain content ensures that as outer grains wear, inner grains are naturally exposed, providing continuous fresh cutting edges
2Productivity
If conventional abrasive tools are used on high fracture toughness materials, then material can be removed, but chip size increases and grinding quality deteriorates
Solution Approach 1:
The patent specifies abrasive particle sizes in the range of 20-60 microns and maintains a volume ratio of abrasive grains to bond material of at least 1.3:1. These parameter changes create optimal cutting conditions for high fracture toughness materials, producing consistent small chip sizes while maintaining high material removal rates through the high density of active cutting edges
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 abrasive articles demonstrate improved grinding performance by maintaining low maximum chip sizes and consistent material removal rates, reducing the frequency of dressing operations and extending the operational life of the abrasive tools.
Implementation Method 1
an abrasive article configured to grind a workpiece... during a periphery insert grinding test operation on at least an edge of a workpiece, the edge of the workpiece has a maximum chip size of less than about 0.0025 inches
Data Source
AI summary
An abrasive article configured to grind a workpiece having a fracture toughness at least about 7 MPa·m0.5 includes a body comprising abrasive particles contained within a bond material comprising a metal, wherein the body comprises a ratio of VAG/VBM of at least about 1.3, wherein VAG is a volume percent of abrasive particles within a total volume of the body and VBM is a volume percent of bond material within the total volume of the body, and wherein the abrasive particles have an average particle size of 40 to 60 microns.