Freeform Surface Repair with Curvature-Adaptive Cladding Paths
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Solution Overview
Problem
Existing methods for repairing freeform surfaces face challenges in achieving sufficient conformal integration, continuity, and uniform thickness in laser cladding layers due to complex surface morphologies and curvature changes, leading to poor repair quality and efficiency.
Innovation Solution
A method and system for adaptive repair involving data discretization, adaptive segmentation, curvature-overlapping pitch optimization, and topological sorting of scanning trajectories to ensure uniformity and continuity of the cladding layer, using normal equidistant curved surface generation and NURBS curve fitting for robotic laser cladding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional planar slicing method is used for freeform surface repair, then the slicing process is simple and widely applicable, but the repair quality deteriorates due to severe staircase effect and poor continuity between layered slices
Solution Approach 1:
The patent segments the freeform surface into multiple layers using adaptive slicing technology, dividing the complex surface into manageable slices while maintaining conformal integration with the base surface. This segmentation approach eliminates the staircase effect by ensuring each slice conforms to the underlying surface geometry, thereby improving repair quality without sacrificing process simplicity
Solution Approach 2:
The patent employs curvature-adaptive slicing that accounts for the varying curvature of freeform surfaces. By adjusting slice orientation and spacing according to local surface curvature, the method maintains smooth transitions between layers and eliminates the staircase effect, achieving high repair quality while keeping the slicing process computationally efficient
2Ease of manufacture
If fixed overlapping pitch is used in trajectory filling, then the trajectory planning is simple for planar workpieces, but the cladding layer thickness becomes uneven on freeform surfaces with varying curvature
Solution Approach 1:
The patent implements dynamic overlapping pitch adjustment based on real-time curvature analysis of the freeform surface. The trajectory planning system continuously adapts the overlapping pitch according to local surface geometry, ensuring uniform cladding layer thickness across regions of varying curvature. This dynamic approach maintains trajectory planning simplicity while achieving precise thickness control
Solution Approach 2:
The patent changes the overlapping pitch parameter dynamically along the trajectory based on surface curvature. By adjusting this critical parameter in response to geometric variations, the system maintains consistent cladding layer thickness across the freeform surface, resolving the contradiction between simple trajectory planning and precise thickness uniformity
3Ease of manufacture
If conventional fixed-direction equidistant offset slicing is used, then the slicing process is straightforward, but surface quality and accuracy deteriorate due to severe staircase effect on worn defect entities
Solution Approach 1:
The patent replaces fixed-direction equidistant offset slicing with curvature-adaptive slicing that follows the natural geometry of the freeform surface. This approach maintains surface accuracy by ensuring slices conform to the underlying curved geometry, eliminating the staircase effect while keeping the slicing process computationally efficient and straightforward to implement
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
Ensures sufficient fusion and continuity of the cladding layer, eliminates the 'staircase effect', and achieves uniform thickness, thereby improving repair quality and efficiency on freeform surfaces.
Implementation Method 1
perform adaptive repair on the freeform surface
Implementation Method 2
thickness of cladding layer formed on a convex surface
Data Source
AI summary
A method for adaptive repair of a freeform surface includes: performing data discretization on a worn workpiece to obtain a worn body to be repaired, and performing adaptive segmentation on the worn body to be repaired to obtain initial reference surfaces, wherein the initial reference surfaces include a worn model bottom surface and a standard model top surface; constructing a freeform surface slice based on each of the initial reference surfaces; calculating surface curvature distribution data of the freeform surface slice, and constructing a curvature-overlapping pitch optimization model to perform adaptive trajectory filling on the freeform surface slice to obtain freeform surface scanning trajectories; and performing topological sorting on scanning trajectory points of the freeform surface scanning trajectories to obtain processing trajectories, fitting the processing trajectories, and performing adaptive repair on the freeform surface. This method eliminates a severe “staircase effect” in a traditional slicing method.