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Closed loop springback control in progressive die bending by induction heating

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Abstract

Large springback of high strength steels in progressive dies hinders accurate manufacturing because a proper prediction of elastic unloading is not possible due to material variations, tool wear, and varying ambient conditions. In order to compensate springback and enhance the forming limit when brittle materials are bent, a warm bending technology for progressive dies through inline induction heating is developed. Within a certain temperature range, there is a linear relation to the springback angle, which allows a direct influence on the final bending angle. Based on this principle, a closed loop control with a feedback of the angle after unloading is implemented, which adjusts the sheet temperature before bending. With the developed discrete controller, finally a stable and fast control mode is achieved so that an initial deviation from the target value is reduced to less than Δθ = ±0.30°.

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Abbreviations

c :

Settling cycles

d :

Damping factor

e :

Error

f :

Frequency

f s :

Stroke rate

n :

Number of dead cycles

T :

Temperature

v r :

Stroke velocity

θ :

Bending angle

θ n :

Nominal angle

Θ :

Springback angle

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Authors and Affiliations

  1. Institute of Forming Technology and Lightweight Construction, TU Dortmund University, Baroper Str. 303, 44227, Dortmund, Germany

    Christian Löbbe, Christoph Hoppe, Christoph Becker & A. Erman Tekkaya

Authors
  1. Christian Löbbe
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  2. Christoph Hoppe
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  3. Christoph Becker
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  4. A. Erman Tekkaya
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Correspondence to Christian Löbbe.

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Löbbe, C., Hoppe, C., Becker, C. et al. Closed loop springback control in progressive die bending by induction heating. Int. J. Precis. Eng. Manuf. 16, 2441–2449 (2015). https://doi.org/10.1007/s12541-015-0314-8

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  • DOI: https://doi.org/10.1007/s12541-015-0314-8

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