Specimen Polishing Pad Moisture Control With Feedback Dispensing
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Solution Overview
Problem
Existing polishing devices face issues with varying moisture content in the polishing pad, leading to ineffective or failed polishing due to inconsistent friction between the specimen and the pad.
Innovation Solution
A device with sensors to measure moisture and friction on the polishing pad, adjusting the dispensing of polishing suspension based on these measurements to maintain a uniform moisture content, ensuring consistent polishing results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If polishing suspension is dispensed at a predefined rate, then the polishing process can be automated, but the moisture content in the polishing pad varies considerably over time and position
Solution Approach 1:
The patent employs sensors to continuously measure the moisture content in the polishing pad and feeds this information back to a control system. Based on the measured moisture levels, the control system dynamically adjusts the dispensing rate of polishing suspension to different positions on the pad, ensuring uniform moisture distribution while maintaining automated operation.
Solution Approach 2:
The system transitions from static, uniform suspension dispensing to dynamic, position-dependent dispensing. The dispensing rate is continuously adjusted based on real-time moisture measurements, allowing the system to adapt to varying moisture conditions across different positions and time periods on the polishing pad.
2Temperature
If the polishing pad is too wet, then friction is reduced and overheating is prevented, but polishing effectiveness decreases and polishing time increases
Solution Approach 1:
The system applies different amounts of polishing suspension to different positions on the polishing pad based on local moisture requirements. Areas that require more cooling receive additional suspension, while areas needing higher friction for effective polishing receive less suspension, optimizing both temperature control and polishing effectiveness locally.
3Productivity
If the polishing pad is too dry, then polishing friction increases, but the polishing process may fail due to excessive friction
Solution Approach 1:
Sensors continuously monitor moisture content and provide feedback to the control system. When moisture levels drop below optimal thresholds, the system automatically increases suspension dispensing to prevent excessive friction and potential polishing failure, ensuring reliable operation.
4Manufacturing precision
If manual monitoring and adjustment of moisture content is performed, then polishing quality can be maintained, but manual work and operational complexity increase
Solution Approach 1:
The system performs self-monitoring and self-adjustment of polishing suspension dispensing. Sensors automatically detect moisture content variations, and the control system autonomously adjusts dispensing rates without requiring manual intervention, maintaining high polishing quality while simplifying operation.
Solution Approach 2:
The patent replaces manual mechanical monitoring and adjustment operations with an automated sensor-based measurement and control system. The mechanical act of manually checking and adjusting moisture content is substituted with electronic sensing and automated control, improving precision while reducing operational complexity.
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 device achieves uniform and high-quality polishing by maintaining a constant moisture level, optimizing suspension use, and minimizing polishing time.
Implementation Method 1
the sensor is arranged in contact with the surface of the polishing pad and is configured to measure the resistance on the polishing pad in a plurality of positions on the polishing pad
Implementation Method 2
The polishing suspension contains water and/or other suitable liquids, such as ethanol or glycol for moistening, cooling and lubricating the polishing pad and abrasive particles
Implementation Method 3
The polishing suspension contains water and/or other suitable liquids, such as ethanol or glycol for moistening, cooling and lubricating the polishing pad and abrasive particles
Data Source
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AI summary
The present invention relates to a device for polishing a specimen (104, 204). The device comprises a polishing platen (101, 201) rotatable about an axis, a polishing pad (103, 203) attached to the polishing platen (101, 201), a specimen holder (105, 205) for holding the specimen (104, 204) against the polishing pad (103, 203), means (107, 110, 207, 212) for measuring a physical quantity in a plurality of positions on the polishing pad (103, 203), the physical quantity being indicative of the moisture or the friction, and means (116, 119, 120, 121, 213, 215, 216, 217) for dispensing a polishing suspension, based on values of the measured physical quantity, to the plurality of positions on the polishing pad (103, 203). The invention also relates to a method for polishing a specimen (104, 204).