A New Approach to Compensate Oscillations of Path-Linked Presses Caused by Inertial Forces

Abstract:

Presses with mechanical linkages based on levers between motor and ram (path-linked presses) tend to oscillate due to inertial forces as a consequence of the drive parts motion.In this publication a new approach for a mass-balancing system is presented. This system allows to generate the optimal compensation forces needed to counteract the inertial forces by means of four linear motors. The control signals for the linear motors are specified by an evolutionary optimization algorithm, which operates on the base of measured accelerations of the press frame. The control signals of the linear motors are created in a way that the machines oscillations are reduced to a minimum. This way the presented mass-balancing system adapts itself automatically to varying conditions during the operation of the machine, such as a tool change or a varying stroke rate.In particular, the present publication provides the results of the conceptual design and the virtual testing of this approach, which has been mainly carried out with the help of multiple-body simulations.

• Periodical: Advanced Materials Research (Volume 1140)
• Pages: 361-368
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1140.361
• Online since: August 2016
• Authors: Stefan Hilscher*, Richard Krimm, Bernd-Arno Behrens
• Keywords: Adaptive Control, Press, Vibration

References

[1] B. -A. Behrens, et. al., Electromagnetic Damping of the Cutting Shock on Sheet Metal Presses, Proceedings of the 8th ICTP, pages 379 and 380, Verona, Italy, (2005).

[2] B. -A. Behrens, et. al., Aktuelle Forschungsergebnisse am Institut für Umformtechnik und Umformmaschinen, Umformtechnik- Ein Wirtschaftszweig mit Potential, ISBN 978-3-00-023874-1, Hrsg. B. -A. Behrens, 19. Umformtechnisches Kolloquium, Hannover, (2008).

[3] H. Dorth, Einfluß des dynamischen Verhaltens mechanischer Kaltfließpressen auf die Produktqualität, Berichte über Fertigungsforschung Nr. 28, TH-Darmstadt, (1995).

[4] O. Eigenmann, Vorrichtung zum Massenausgleich bei Stanzmaschinen, Euro-Patent 0455 988B1, (1991).

[5] B. -A. Behrens, et. al., New Methods to Reduce the Vibrations of the Ram and the Press Body while Blanking of Sheet Metal, Key Engineering Materials Vol. 549 pp.277-283, Trans Tech Publications, (2013).

DOI: 10.4028/www.scientific.net/kem.549.277

[6] Information on http: /www. haulick-roos. de/, last seen 10. 04. (2016).

[7] Information on http: /www. bruderer-presses. com/, last seen 10. 04. (2016).

[8] A. Osborn, S. Paul, Servo-press technology, Drive design and performance, Metal Forming, Band 42 (2008).

[9] J. Huhse, Selbstorganisierende Evolutionsstrategien, Dissertation Universität Tübingen, (2002).

[10] E. Schöneburg, F. Heinzmann, S. Feddersen, Genetische Algorithmen und Evolutionsstrategien – Eine Einführung in Theorie und Praxis der simulierten Evolution, Addison-Wesley, Bonn, (1994).