Correction of Incremental Sheet Forming using a Data-Driven Iterative Learning Controller

Abstract

Single Point Incremental Forming (SPIF) is a flexible sheet manufacturing technology. While not viable for large scale production applications, SPIF excels in the small batch size and rapid prototyping environments, since geometry-specific tooling is not required. However, due to the lack of in-process support, SPIF typically results in parts with poor geometric tolerances when compared to more traditional part forming techniques such as stamping and deep drawing. For this reason, SPIF has yet to be widely adopted in the industry. In this work, a method of constructing a data-driven model for use with norm-optimal Iterative Learning Controller (ILC) is developed to improve the accuracy of a SPIF process. Using in-process measurements of the sheet along with knowledge of the input, a data-driven model is constructed to optimize the input by predicting the resulting geometry from a change in tool depth. This Iterative Learning Controller was tested on a truncated pyramid geometry, and the results showed that the controller was able to effectively reduce the process error from an MAE of 4.053 mm to 0.912 mm after five iterations.

Meeting Name

2021 American Control Conference, ACC 2021 (2021: May 25-28, Virtual)

Department(s)

Mechanical and Aerospace Engineering

International Standard Book Number (ISBN)

978-166544197-1

International Standard Serial Number (ISSN)

0743-1619

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2021 International Federation for Automatic Control (IFAC), All rights reserved.

Publication Date

28 May 2021

Link to Full Text

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