CAD Section View Cutting Line Auto-Constraint Inference
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Solution Overview
Problem
Current CAD systems require design engineers to create a sketch and manually constrain points to generate a section view, which is time-consuming and requires significant mouse travel and clicks, hindering productivity.
Innovation Solution
A computer-implemented method that allows creating an initial cutting line with a predetermined path, constraining it at any point on the model, and enhancing it interactively using a cursor-controlled device, with automatic addition of line segments based on set rules, eliminating the need for pre-sketching and reducing mouse clicks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a design engineer uses traditional sketch tools to create a cutting pattern for a section view, then the section view can be generated, but the process requires significant mouse travel and mouse clicks, increasing the time and effort required
Solution Approach 1:
The system automatically infers geometric candidates and applies constraints without requiring the user to manually select each element. The cutting line automatically constrains to identified geometric features (centers, edges, vertices) of the 3D model, eliminating the need for users to manually specify each constraint point and type.
Solution Approach 2:
The invention extracts and removes the intermediate sketching step from the traditional workflow. Instead of requiring users to create a complete sketch with manual constraints, the system directly creates the cutting line by inferring constraints from the 3D model geometry, taking out the time-consuming manual sketching portion while retaining the essential cutting line creation functionality.
2Manufacturing precision
If a design engineer manually creates geometric constraints by selecting geometry in the sketch and geometry in the 3D model, then the cutting line can be properly constrained, but the process is time-consuming and requires repeated selections for each constraint
Solution Approach 1:
The system performs preliminary analysis of the 3D model geometry to pre-identify potential constraint candidates (centers, edges, vertices) before the user finalizes the cutting line. This preliminary action allows the system to automatically apply appropriate constraints without requiring the user to manually select each geometric element and specify constraint types during the cutting line creation process.
Solution Approach 2:
The system automatically infers and applies geometric constraints by analyzing the 3D model geometry and determining the most appropriate constraint types (coincident, concentric, etc.) without user intervention. The cutting line self-constrains to the identified geometric features, eliminating the manual constraint creation process while maintaining precision.
3Adaptability or versatility
If a design engineer uses indirect connection through reference points to constrain sketch geometry to the 3D model, then constraints can be applied, but the process becomes more complex with additional steps
Solution Approach 1:
The invention removes the intermediate reference point step from the constraint application process. Instead of requiring users to create reference points and then constrain sketch geometry to those points, the system directly constrains the cutting line to the 3D model geometry by inferring constraints from geometric features, eliminating the unnecessary intermediate step while maintaining constraint flexibility.
4Reliability
If a design engineer must create a sketch before creating a section view, then the cutting pattern can be defined, but the overall process time is increased due to the preliminary sketching requirement
Solution Approach 1:
The system extracts and eliminates the separate sketch creation step from the section view generation process. The cutting line is created directly through interactive drawing with automatic geometric constraint inference, removing the preliminary sketching requirement while maintaining the ability to define accurate cutting patterns for section views.
Data Source
AI summary
Creating a section view of a computer-aided design model includes creating a cutting line to apply to the computer-aided design model by at least one cut operation, constraining the cutting line by selecting a constraining point on the computer-aided design model or first inferring a geometric candidate to constrain the initial cutting line, and enhancing the cutting line by automatically adding an enhancement according to an enhancement type and adjusting the enhancement via a cursor-controlled device according to a set of rules.