Robotic Arm Profilometer Alignment for Warped Blade Sharpening
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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 struggle to accurately reproduce original edge profiles, 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 surface profile of cutting tools, allowing precise manipulation and operation by workstations such as grinders and polishers, with a gripper that grasps blades away from the handle to minimize flex and enable high-resolution edge profiling and targeted sharpening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a robotic arm system is used for sharpening cutting tools, then productivity is improved, but manufacturing precision deteriorates due to inability to handle blades with bends or warps
Solution Approach 1:
The system performs a profilometer scan to capture the actual edge profile of the blade before sharpening. This preliminary measurement allows the control system to calculate compensatory motion paths that account for bends or warps in the blade, enabling the robotic arm to reproduce the original edge profile accurately despite the blade's deformations.
Solution Approach 2:
The profilometer provides real-time feedback on the blade's actual geometry during the sharpening process. The control system uses this feedback information to dynamically adjust the robotic arm's motion, ensuring that the sharpening operation compensates for blade deformations and achieves the desired edge profile accuracy.
2Manufacturing precision
If manual intervention is used to handle blades with bends or warps, then manufacturing precision is improved, but productivity deteriorates due to lengthy processing times
Solution Approach 1:
The system enables the robotic arm to automatically compensate for blade deformations through computational geometry and control algorithms. The profilometer data is processed to generate compensatory motion paths, allowing the robotic system to handle blades with bends or warps autonomously without requiring manual intervention, thus maintaining both precision and productivity.
3Device complexity
If conventional scanning methods are used, then device complexity is reduced, but measurement precision deteriorates due to inability to capture high-resolution edge profiles
Solution Approach 1:
The profilometer acts as an intermediary measurement device that captures high-resolution edge profile data of the blade. This specialized sensor provides detailed geometric information that conventional scanning methods cannot achieve, enabling the control system to accurately reproduce complex edge profiles while maintaining a relatively simple overall system architecture.
4Ease of operation
If the robotic arm grasps the blade near the handle, then ease of operation is improved, but manufacturing precision deteriorates due to blade flex during manipulation
Solution Approach 1:
The system applies different gripping strategies for different portions of the blade. The robotic arm grasps the blade at an optimized location that minimizes flex during the sharpening operation, while the profilometer captures the actual geometry of the edge region. This localized optimization of the gripping position ensures both ease of operation and manufacturing precision.
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 rapidly and accurately sharpens cutting tool blades, reproducing original edge profiles with high precision, capable of handling blades with minor bends or warps, and can remove defects, achieving Anago Scores of greater than 8.0 within a cycle time of 15 to 45 seconds.
Implementation Method 1
a 3D scanning profilometer to determine a surface profile of the cutting tool
Implementation Method 2
based on the profilometer scan, computationally determining a physical surface profile
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.