Robotic Abrasive Trajectory Control for Clear Coat Haze Reduction
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Solution Overview
Problem
Automated robotic systems struggle to replicate the precise and aesthetic finishing of clear coat repairs on vehicles, particularly in reducing haze and scratches, due to their inability to control speed and force independently, leading to undesirable surface appearances like 'bulls-eye' and 'pin-wheel' haze patterns.
Innovation Solution
Implementing customized robotic buffing trajectories that taper rotational speed and applied force before the end of the polishing process, combined with adjustments in the robotic arm's position, to minimize haze and scratches on vehicle surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated robotic systems use constant speed and force during polishing, then productivity is improved, but manufacturing precision deteriorates due to haze and scratch patterns
Solution Approach 1:
The robotic system dynamically adjusts speed and force parameters during the polishing process. The controller modifies rotational speed and applied force in real-time based on the polishing trajectory phase, transitioning from constant high-speed operation to variable speed profiles that reduce speed and force near trajectory endpoints, thereby eliminating haze and scratch patterns while maintaining overall productivity
Solution Approach 2:
The system changes operational parameters (speed and force) during the polishing process. The controller implements time-varying speed profiles and force adjustments, reducing rotational speed and applied force as the polishing head approaches trajectory endpoints, which prevents the formation of bulls-eye and pin-wheel haze effects while maintaining efficient cycle times
2Manufacturing precision
If robotic systems reduce speed and force before trajectory endpoint, then manufacturing precision is improved, but loss of time increases
Solution Approach 1:
The controller preliminarily adjusts speed and force parameters before the polishing head reaches the trajectory endpoint. By anticipating the endpoint approach and proactively reducing speed and force, the system prevents haze formation without requiring extended dwell time at the endpoint, thus maintaining overall cycle time efficiency while achieving superior surface appearance
Solution Approach 2:
The system applies partial action by reducing speed and force only in the critical region near the trajectory endpoint rather than maintaining reduced parameters throughout the entire polishing path. This localized parameter adjustment achieves the necessary surface quality improvement without excessive time loss, balancing precision requirements with productivity constraints
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
Significantly reduces 'bulls-eye' and 'pin-wheel' haze effects while maintaining efficient cycle times, achieving a smoother surface finish comparable to human-operated processes.
Implementation Method 1
A surface abrading system is presented that includes a robot arm with an end effector on an end of the robot arm. The end effector is configured to couple to an abrasive article.
Data Source
AI summary
A surface abrading system is presented that includes a robot arm with an end effector on an end of the robot arm. The end effector is configured to couple to an abrasive article. The system also includes a movement mechanism that moves the robot arm with respect to a surface. The system also includes a robot controller that causes the robot arm to execute an abrasive trajectory on the surface. The abrasive trajectory includes the abrasive article in contact with the surface. The robot controller includes a trajectory retriever that retrieves an abrasive trajectory. The abrasive trajectory includes a surface appearance portion prior to an endpoint. The surface appearance portion comprises a reduction in relative movement speed between the robot arm and the abrasive article or a reduction in effective applied force on the abrasive article. The controller also includes a command generator that communicates the abrasive trajectory to the movement mechanism to execute the trajectory.