Robotic Arm Profilometer Control for Sharpening Warped Blades
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Solution Overview
Problem
Existing robotic systems for sharpening cutting tools lack precision and efficiency in handling blades with bends or warps, and fail to accurately reproduce the original edge profile, often requiring manual intervention and lengthy processing times.
Innovation Solution
A computer-controlled industrial robotic arm system that uses 3D scanning profilometers to determine the precise surface profile of cutting tools, allowing for automated manipulation and sharpening by passing the blade edges across grinding and polishing stations with pre-defined trajectories based on the target edge profile, ensuring consistent sharpening regardless of minor bends or warps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual sharpening methods are used, then flexibility in handling bent blades is improved, but precision and consistency of edge profile reproduction deteriorate
Solution Approach 1:
The system performs preliminary 3D scanning and profilometry to capture the actual geometry of the blade edge before sharpening. This advance measurement allows the control system to pre-calculate compensation trajectories that account for bends and warps, enabling the robotic arm to automatically compensate for deviations without manual intervention while maintaining precise edge profile reproduction
Solution Approach 2:
The system employs feedback through profilometer scans that continuously monitor the blade edge geometry during manipulation. The control system compares scanned profiles against target profiles and dynamically adjusts robotic arm trajectories in real-time, creating a closed-loop control system that maintains precision even when handling bent or warped blades
2Productivity
If automated robotic sharpening is implemented, then productivity is improved, but precision in handling irregular blade geometries deteriorates
Solution Approach 1:
The system implements dynamic trajectory adjustment where the robotic arm's motion paths are not fixed but are continuously adapted based on real-time profilometer feedback. The control system calculates and applies dynamic compensation for blade bends and warps during the sharpening process, allowing automated operation to maintain precision across varied blade geometries while preserving high productivity
Solution Approach 2:
The system changes operational parameters dynamically by adjusting robotic arm velocity, acceleration, and positioning based on detected blade geometry. When bends or warps are detected through profilometry, the control system modifies motion parameters to optimize contact between the blade edge and sharpening surface, maintaining precision throughout the automated high-speed process
3Manufacturing precision
If complex manual adjustment procedures are used, then precision in reproducing original edge profiles is improved, but processing time and operational complexity increase
Solution Approach 1:
The system replaces manual mechanical adjustment procedures with automated computational geometry processing. The control system uses computer algorithms to analyze profilometer data, calculate compensation trajectories, and generate robotic motion paths automatically, eliminating time-consuming manual measurements and adjustments while maintaining or improving edge profile reproduction accuracy
Solution Approach 2:
The system creates a digital copy of the blade edge geometry through 3D scanning and profilometry. This digital model is then used to generate the exact compensation needed to reproduce the original edge profile, replacing manual measurement and calculation processes with automated digital modeling that is both faster and more precise
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 system enables rapid and accurate sharpening of cutting tool blades, maintaining the original edge profile and removing defects, with a cycle time of 15 to 45 seconds, achieving Anago Scores of greater than or equal to 8.0, and accommodating blades with minor bends or warps.
Implementation Method 1
a 3D scanning profilometer configured to scan a blade edge of the workpiece
Data Source
AI summary
A computer-controlled robotic arm performs operations upon a workpiece, such as a knife with a blade that requires sharpening, by a set of one or more workstations, such as a grinder and a polisher. A position target having a defined surface profile is attached to the robot arm and scanned by a profilometer to determine a relative position of the arm with respect to a target centerpoint feature. The arm is then used to manipulate the centerpoint feature to locate operating features, such as a grinder's grinding surface, of the various workstations in the robot arm's coordinate system. A workpiece grasped by the robot arm is then scanned along with the target or another target to locate and profile the workpiece relative to the target. Based on the determined profile and positional relationships, the robot arm manipulates the workpieces so as to be operated upon by the workstations.