CAD Modelling with Two-Way Constraints for 2D–3D Consistency
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Solution Overview
Problem
Conventional CAD systems struggle to maintain consistent behavior between 2D and 3D representations of designs, particularly in manufacturing processes involving sheet metal bending, leading to complex shapes that are difficult to handle on production lines and increased costs due to unnecessary cuts and iterations.
Innovation Solution
A method and system that apply two-way associative constraints to CAD models, ensuring that modifications in 3D are reflected consistently in 2D, using constraints to maintain geometric relationships and reduce unnecessary calculations, thereby simplifying manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional CAD systems modify 3D models independently without two-way constraints, then 3D design flexibility is improved, but consistency with 2D manufacturing representations deteriorates
Solution Approach 1:
The patent merges 2D and 3D constraint systems into a unified two-way associative constraint framework. When a modification is applied to either the 2D article or 3D associated article, the system combines constraints from both views and solves simultaneously to ensure consistent behavior across representations, eliminating the independence that caused inconsistency.
Solution Approach 2:
The system implements feedback by continuously checking constraint satisfaction when modifications occur in either 2D or 3D space. The solve operation verifies whether all constraints are met, and if not, the system adjusts the modification or notifies the user, ensuring that design flexibility does not compromise representation consistency.
2Adaptability or versatility
If complex modifications are applied to 3D models without constraint validation, then design capability is improved, but manufacturing complexity increases
Solution Approach 1:
The system performs preliminary constraint validation before finalizing modifications. By solving constraints in advance and checking plausibility, the system prevents complex shapes that would be difficult to manufacture. This preliminary check ensures that design capability is enhanced while manufacturing complexity is controlled.
Solution Approach 2:
The patent converts the potential harm of complex modifications into benefit by using constraint solving to guide modifications toward manufacturable solutions. When a modification would create unacceptable complexity, the constraint system redirects the design toward simpler, more manufacturable alternatives, turning a potential problem into a design advantage.
3Adaptability or versatility
If iterative modifications are performed without simultaneous 2D-3D solving, then design exploration is improved, but processing time increases
Solution Approach 1:
The patent combines 2D and 3D solving operations into a single simultaneous process. Instead of performing separate iterative modifications in each view, the system solves both representations together in one operation, reducing the number of processing steps while maintaining design exploration capability.
Data Source
AI summary
A method of modifying a CAD system model performed on a data processing system includes receiving a dataset of co-ordinates representing an article in 2d, or in 3d and receiving 2d or 3d constraints respectively, to be applied to any changes to the dataset of co-ordinates for the article. A modification to be applied to the dataset is received and combined with the relevant 2d and 3d constraints to produce a constrained modification for each of the article and associated article. The constrained modification is solved in 2d and in 3d to determine whether a solution exists in which all constraints are met. If the solve is successful, the constrained modification is applied to each dataset simultaneously and, updated datasets are stored. If the solve fails, the constraints may be reduced and the solve step repeated, or the process is terminated.