Iterative learning control of single point incremental sheet forming process using digital image correlation

Fischer, Joseph D.; Woodside, Mitchell R.; Gonzalez, Mercedes M.; Lutes, Nathan; Bristow, Douglas A.; Landers, Robert G.

doi:10.1016/j.promfg.2019.06.108

Cited by 9 publications

(2 citation statements)

References 13 publications

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“…Here, the 3D shape is obtained using stereoscopic digital image correlation (DIC). Three-dimensional DIC was applied, for example, for the analysis of three-dimensional displacement fields in fracture experiments [16] or in ISF for measuring the shape of the formed part to iteratively control the forming process [17]. Siebert et al [18] have shown that 3D DIC enables a sufficient dynamic range in the lateral but not in the axial direction with respect to the intended application in tool deflection measurement.…”

Section: State Of the Artmentioning

confidence: 99%

Shadow-Imaging-Based Triangulation Approach for Tool Deflection Measurement

Terlau,

von Freyberg,

Stöbener

et al. 2023

Sensors

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As incrementally formed sheets show large geometric deviations resulting from the deflection of the forming tool, an in-process measurement of the tool tip position is required. In order to cover a measuring volume of 2.0 m × 1.0 m × 0.2 m and to achieve measuring uncertainties of less than 50 µm, a multi-sensor system based on triangulation is realized. Each shadow imaging sensor in the multi-sensor system evaluates the direction vector to an LED attached to the tool, and the three-dimensional position of the LED is then determined from the combination of two sensors. Experimental results show that the angle of view from the sensor to the LED limits both the measurement range and the measurement uncertainty. The measurement uncertainty is dominated by systematic deviations, but these can be compensated, so that the measurement uncertainty required for measuring the tool tip position in the ISF is achieved.

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Section: State Of the Artmentioning

confidence: 99%

Shadow-Imaging-Based Triangulation Approach for Tool Deflection Measurement

Terlau,

von Freyberg,

Stöbener

et al. 2023

Sensors

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show abstract

“…The measurement results were 3D trajectories of three joint nodes and vibration responses in these nodes during robot movement. The authors in [21] proposed an algorithm of simple iterative learning control of a robot, whose aim was to reduce geometric errors occurring in the technology process known as single point incremental sheet forming. They apply the 3D digital image correlation method to measure the geometric error along the tool path.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Approach Direction on the Repeatability of an Industrial Robot

et al. 2020

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The article aims to prove the hypothesis, that an approach direction influences repeatability at target point of a trajectory. Unlike most researches that deal with absolute accuracy, this paper is focused on determining the achievable repeatability and the influence of the direction of approach on it. To prove the hypothesis, several measurements are performed under different conditions, on industrial robot ABB IRB1200. To verify and confirm the result obtained from the resolvers located on the individual axes of the robot, the measurements are replicated using high-speed digital image correlation cameras. Using an external measuring device, the real repeatability of the robot endpoint is determined. The measurement proved the correctness of the hypothesis, i.e., the dependence of the approach direction on repeatability was proved. Furthermore, real deviations were measured and the extent of this influence on the robot repeatability was determined.

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A MANFIS-based geometric deviation prediction and optimal parameter selection for SPIF geometric accuracy improvement

Cecil¹

2021

Soft Comput

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Iterative learning control of single point incremental sheet forming process using digital image correlation

Cited by 9 publications

References 13 publications

Shadow-Imaging-Based Triangulation Approach for Tool Deflection Measurement

Shadow-Imaging-Based Triangulation Approach for Tool Deflection Measurement

Influence of the Approach Direction on the Repeatability of an Industrial Robot

A MANFIS-based geometric deviation prediction and optimal parameter selection for SPIF geometric accuracy improvement

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