Nonvisual Abrasive Wear Detection in Robotic Abrading
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Solution Overview
Problem
Existing abrasive articles face challenges in improving cost, performance, and life, particularly in robotic abrading systems where human operators are not available to detect the end of life by noticing changes in abrading efficiency.
Innovation Solution
A robotic abrading system with a detector that senses nonvisual abrasive wear cues, generating an indication of wear, and adjusts operational parameters based on the wear cue, using a force control unit and a wear indication system to determine the abrasive article's amount of wear and adjust operations accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated robotic abrading systems are used to replace human operators, then productivity and consistency are improved, but the ability to detect end-of-life wear cues deteriorates since human operators cannot notice changes in abrading efficiency
Solution Approach 1:
The patent introduces an intermediary sensor system that detects wear cues (such as changes in abrading efficiency, vibration, or acoustic signals) and translates them into actionable information. This intermediary bridge allows automated robotic systems to perceive wear states that would otherwise be undetectable, resolving the contradiction between automation and wear detection capability.
2Ease of manufacture
If abrasive articles are used until complete wear to maximize utilization, then cost efficiency is improved, but productivity deteriorates due to unexpected failure and potential damage to the substrate
Solution Approach 1:
The patent implements a feedback mechanism where sensors continuously monitor the abrasive article's condition and provide real-time information about wear state. This feedback loop enables the system to determine optimal replacement timing, allowing abrasive articles to be used until their true end-of-life without unexpected failures. The system balances cost efficiency by maximizing utilization while maintaining productivity through planned replacement based on actual wear conditions rather than fixed schedules.
3Productivity
If frequent replacement of abrasive articles is performed to maintain optimal performance, then productivity is improved, but cost efficiency deteriorates due to premature replacement
Solution Approach 1:
The sensor system provides continuous feedback on the actual wear state and abrading efficiency of the abrasive article. This information allows the system to replace articles only when performance degradation reaches a threshold, rather than following a fixed replacement schedule. Consequently, articles are replaced at the optimal moment - just before performance becomes unacceptable - maximizing utilization while maintaining consistent productivity.
4Loss of information
If wear detection systems are added to robotic abrading systems, then wear detection capability is improved, but device complexity increases
Solution Approach 1:
The patent employs sensor intermediaries that detect various physical parameters (vibration, acoustic emissions, current draw, temperature) associated with abrasive wear. These sensors act as mediators between the abrasive article and the control system, translating complex wear phenomena into simple detectable signals. While this does add components, the sensors leverage existing monitoring infrastructure in robotic systems, minimizing the increase in overall system complexity while significantly improving wear detection capability.
Data Source
AI summary
An abrasive article evaluation system is presented that includes a detector that detects a nonvisual abrasive wear cue and an efficiency indication generator that, based on the abrasive wear cue, generates an indication of wear for the abrasive article. The system also includes a command generator that generates a command based in the generated indication of wear.