Stamped Flange Surface Extension for G1/G2 Continuity
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Solution Overview
Problem
Current computer-aided design systems lack an efficient method for designing stamping parts with flanges, particularly in ensuring high-quality g1 and g2 continuity for smooth folding and manufacturing processes.
Innovation Solution
A computer-implemented method that creates a second boundary representation (B-Rep) model with extrapolation patches along the 3D boundary curve, ensuring g2 continuity over a specific length and g1 continuity over another length, by partitioning boundary-curve edges and applying surface-extension and fillet-connect operators to form unfolded flanges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional CAD systems are used for designing stamping parts with flanges, then basic design functionality is provided, but high-quality g1 and g2 continuity cannot be ensured for smooth folding
Solution Approach 1:
The boundary curve is partitioned into multiple segments based on curvature characteristics (convex/concave regions). Each segment is processed independently with appropriate continuity requirements, allowing g2 continuity in critical folding regions while maintaining g1 continuity elsewhere, thus achieving high manufacturing precision without excessive overall complexity
Solution Approach 2:
Different continuity levels (g1 or g2) are applied to different segments of the boundary curve based on local geometric characteristics. Regions requiring smooth folding are assigned g2 continuity, while other regions use g1 continuity, optimizing manufacturing quality where needed without unnecessarily complicating the entire design process
2Productivity
If manual design methods are used for stamping parts, then flexibility is maintained, but productivity and efficiency are reduced
Solution Approach 1:
The system automatically partitions the boundary curve into convex and concave segments and assigns appropriate continuity levels without requiring manual intervention. The computer-implemented method performs the entire extrapolation process autonomously, significantly improving design efficiency while maintaining ease of operation through automated decision-making algorithms
3Manufacturing precision
If extrapolation patches are applied along the 3D boundary curve, then unfolded flanges are formed with required continuity, but computational complexity increases
Solution Approach 1:
The boundary curve is divided into manageable segments (first groups and second groups) based on curvature properties. Extrapolation patches are generated for each segment independently, reducing computational complexity compared to processing the entire curve as a single entity, while still ensuring required continuity quality at segment boundaries
Solution Approach 2:
The system applies g2 continuity (excessive action) only where required for smooth folding, while using g1 continuity (partial action) in other regions. This selective application of continuity levels optimizes manufacturing precision without unnecessarily increasing computational complexity across the entire model
Data Source
AI summary
A stamping part design method including obtaining a first B-rep model having a 3D boundary curve formed by boundary-curve edges and obtaining a first and second value representing a g1-continuity and a g2-continuity extrapolation length requirement. The method includes determining a second B-Rep model comprising an extrapolation of the first B-Rep model and presenting at least a g2-continuity over a length of the extrapolation patches equal to the second value and then at least a g1-continuity over a length of the extrapolation patches equal to the first value. The determination of the second B-Rep model includes partitioning the boundary-curve edges into first groups of consecutive first boundary-curve edges, and second groups of consecutive second boundary-curve edges and applying a surface-extension operator to each first group and filling the gaps. This forms an improved solution of stamping part design.