Speckle photographic in-process measurement of three-dimensional deformations in running manufacturing processes

Andreas Tausendfreund; Dirk Stöbener; Andreas Fischer

doi:10.1117/12.2592284

20 June 2021 Speckle photographic in-process measurement of three-dimensional deformations in running manufacturing processes

Andreas Tausendfreund, Dirk Stöbener, Andreas Fischer

Author Affiliations +

Proceedings Volume 11782, Optical Measurement Systems for Industrial Inspection XII; 1178205 (2021) https://doi.org/10.1117/12.2592284
Event: SPIE Optical Metrology, 2021, Online Only

Abstract

The concept of process signature uses the relationship between a material load and the resulting modification remaining in the workpiece to better understand and optimize manufacturing processes. The metrological recording of the loads occurring during the machining process in the form of mechanical deformations is the basic prerequisite for this approach. An appropriate characterization method is speckle photography, which is already applied for in-plane deformation measurements in various manufacturing processes. A shortcoming of this fast and robust measurement technique based on image correlation techniques is that deformations in the direction of the measurement system are not detected and that they increase the error of measurement for in-plane deformations. Therefore, this work investigates a method that infers local out-of-plane motions of the workpiece surface from the decorrelation of speckle patterns and thus is able to reconstruct three-dimensional deformation fields. The implementation of the evaluation method in existing sub-pixel interpolation algorithms enables a fast reconstruction of 3D deformation fields, so that the desirable in-process capability remains given. Using a deep rolling process, first measurements show that dynamic 3D-deformations below the tool can be detected, which confirms the suitability of the speckle photography not only for the 2D- but also the 3D-analysis of deformations in manufacturing processes.

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Andreas Tausendfreund, Dirk Stöbener, and Andreas Fischer "Speckle photographic in-process measurement of three-dimensional deformations in running manufacturing processes", Proc. SPIE 11782, Optical Measurement Systems for Industrial Inspection XII, 1178205 (20 June 2021); https://doi.org/10.1117/12.2592284

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