Optimizing Part Orientation for Incremental Sheet Forming
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Solution Overview
Problem
Incremental sheet forming techniques face challenges in achieving precise orientation of parts to maximize the thickness of the thinnest portion, especially for complex shapes, leading to suboptimal thickness profiles and potential failure modes like buckling and tearing.
Innovation Solution
A method and system that characterize the shape of a part relative to a virtual plane, identifying a forming orientation where the thickness of the thinnest portion is maximized by approximating the shape with surface elements, calculating actual and projected areas, and evaluating orientations using computational techniques like the Sine law and algorithms such as Nelder-Mead to determine the optimal orientation for forming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual orientation selection is used based on operator experience, then the process is simple and fast, but the manufacturing precision of thickness distribution deteriorates for complex shapes
Solution Approach 1:
The patent replaces manual operator judgment with an automated computer-based system that calculates optimal forming orientations using computational algorithms. The system evaluates multiple orientations by computing projected areas and thickness distributions, automatically selecting the optimal orientation without relying on operator experience, thereby achieving precise thickness control for complex shapes.
Solution Approach 2:
The patent systematically varies the forming orientation parameters (rotation angles around x and y axes) to evaluate multiple possible orientations. By changing these parameters and calculating the resulting thickness distributions for each orientation, the system identifies the optimal orientation that maximizes the minimum thickness, transforming a subjective manual process into an objective parameter optimization process.
2Ease of manufacture
If complex shapes are formed in suboptimal orientations, then the forming process is simpler, but the manufacturing precision of thickness profile deteriorates
Solution Approach 1:
The patent performs preliminary calculation and evaluation of multiple forming orientations before the actual forming process. By pre-computing the thickness distributions and identifying the optimal orientation in advance, the system ensures that the subsequent forming process achieves maximum thickness uniformity without requiring complex adjustments during manufacturing.
Solution Approach 2:
The patent creates a virtual model of the part geometry and uses computational algorithms to simulate and evaluate different forming orientations on this digital copy. This virtual evaluation allows optimization of the forming orientation without physical trial-and-error, ensuring the actual forming process uses the optimal orientation for achieving uniform thickness profiles.
3Reliability
If the thickness of the thinnest portion is maximized through optimal orientation, then the reliability of the part improves, but the device complexity increases due to computational requirements
Solution Approach 1:
The patent implements a self-service system where the computer automatically performs all calculations, evaluations, and orientation selections without requiring external expert intervention. The system uses built-in algorithms to compute projected areas, evaluate thickness distributions, and identify the optimal orientation autonomously, reducing the need for complex external computational resources while ensuring reliable thickness uniformity.
Data Source
AI summary
Provided are methods and systems of orienting parts for incremental sheet forming and, in some examples, forming the parts in these orientations. A forming orientation may be identified by simulating forming operations of the same part in multiple different orientations and identifying the thinnest portions of the part for each of the orientations. The orientation with the maximum thickness of these identified portions is selected as a forming orientation. The forming simulation may be based on the Sine law by comparing the actual and projected areas of different surface elements of the shape to be formed. As such, a part formed in the forming orientation will have the greatest minimum thickness among all other possible orientations.