Abrasive Layer Visual Indicators for Wear and Geometry Monitoring

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Solution Overview

Problem

Existing abrasive articles face challenges in efficiently identifying the thickness and geometry deviations of the abrasive layer during use, leading to potential quality issues and inefficient replacement timing, particularly in complex processes like double disk grinding.

Innovation Solution

Incorporation of visual indicators with varying cross-sections in the abrasive layer's main surface, where the size, shape, and location of these indicators correspond to the layer's thickness, allowing real-time monitoring of wear and facilitating timely replacement decisions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If regular measurement of abrasive article geometry is performed, then wear control and quality monitoring are improved, but measurement time increases and grinding productivity decreases

Engineering Contradiction:

Improvegeometry measurement precisionVSAvoidgrinding productivity

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

Visual indicators are embedded in the abrasive layer during manufacturing, preparing the monitoring function in advance. This eliminates the need for time-consuming measurements during operation, as the thickness information is immediately visible through color-coded indicators that show remaining life at a glance.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces mechanical measurement systems with an optical visualization system. Instead of using measurement tools to physically assess abrasive layer thickness, color-coded visual indicators provide immediate thickness information through optical means, eliminating the need for contact measurement and maintaining continuous grinding operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If dummy layers are added underneath the abrasive layer, then prevention of workpiece-carrier contact is improved, but detection of actual layer thickness and shape deviations is not helped

Engineering Contradiction:

Improveworkpiece quality protectionVSAvoidabrasive layer thickness information

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent applies different properties to different parts of the abrasive article. The dummy layer provides protective function at the bottom, while color-coded visual indicators embedded at specific depths provide localized thickness information at critical locations. This allows simultaneous achievement of protection and information provision through spatially differentiated features.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The visual indicators act as intermediaries between the abrasive layer structure and the user. Instead of directly measuring or inferring thickness, the color-coded indicators provide indirect visual information about remaining life and thickness at specific depths, enabling informed decisions without direct measurement.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Manufacturing precision

If early replacement of abrasive articles is performed, then machining quality is maintained, but abrasive article lifespan is reduced and cost increases

Engineering Contradiction:

Improvemachining qualityVSAvoidabrasive article lifespan

Core Design Contradiction:

Manufacturing precisionVSDuration of action of moving object

Solution Approach 1:

The color-coded visual indicators provide continuous feedback about the abrasive layer thickness and remaining useful life. By monitoring the color changes and indicator visibility, operators can determine the optimal replacement moment based on actual wear conditions, replacing the abrasive article when indicators show remaining life is sufficient, thereby extending lifespan while maintaining quality.

Inventive Principle:

Principle #23Feedback

4Duration of action of moving object

If late replacement of abrasive articles is performed, then abrasive article lifespan is extended and cost reduced, but machining quality deteriorates due to excessive wear

Engineering Contradiction:

Improveabrasive article lifespanVSAvoidmachining quality

Core Design Contradiction:

Duration of action of moving objectVSManufacturing precision

Solution Approach 1:

The visual indicators are prepared in advance at specific depth positions, allowing operators to see remaining life information before the abrasive layer is completely worn. This preliminary visualization of remaining thickness enables proactive replacement planning, extending usable life by utilizing the full remaining thickness while preventing quality deterioration by replacing before the layer is exhausted.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12605804B2Abrasive article

Publication Date: 2026.04.21 3M INNOVATIVE PROPERTIES CO

AI summary

The invention relates to an abrasive article 1 for abrading at least one workpiece, the abrasive article with: a carrier body 2, at least one abrasive layer 3 with a main surface and a predefined thickness, the at least one abrasive layer being arranged on the carrier body, at least two visual indicators 6 with a cross-section in the main surface of the abrasive layer, wherein the size, shape and/or location of the cross-section of the visual indicators in the main surface of the abrasive layer depends on the thickness of the abrasive layer at more than one location of the visual indicators.