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Development of an automated assembly process supported with an artificial neural network

Bobka P., Heyn J., Henningson J.-O., Römer M., Engbers T., Dietrich F., Dröder K.

Journal of Machine Engineering

2018

Vol. 18, No. 3

28--41

A central problem in automated assembly is the ramp-up phase. In order to achieve the required tolerances and cycle times, assembly parameters must be determined by extensive manual parameter variations. Therefore, the duration of the ramp-up phase represents a planning uncertainty and a financial risk, especially when high demands are placed on dynamics and precision. To complete this phase as efficiently as possible, comprehensive planning and experienced personnel are necessary. In this paper, we examine the use of machine learning techniques for the ramp-up of an automated assembly process. Specifically we use a deep artificial neural network to learn process parameters for pick-and-place operations of planar objects. We describe how the handling parameters of an industrial robot can be adjusted and optimized automatically by artificial neural networks and examine this approach in laboratory experiments. Furthermore, we test whether an artificial neural network can be used to optimize assembly parameters in process as an adaptive process controller. Finally, we discuss the advantages and disadvantages of the described approach for the determination of optimal assembly parameters in the ramp-up phase and during the utilization phase.

Detection of wear parameters using existing sensors in the machines environment to reach higher machine precision

Schmitt R. R., Decressin R., Dietrich F., Dröder K.

Journal of Machine Engineering

2018

Vol. 18, No. 2

85--96

This paper presents methods to plan predictive maintenance for precision assembly tasks. One of the key aspects of this approach is handling the abnormalities during the development phase, i.e. before and during process implementation. The goal is to identify abnormalities which are prone to failure and finding methods to monitor them. To achieve this, an example assembly system is presented. A Failure Mode and Effects Analysis is then applied to this assembly system to show which key elements influence the overall product quality. Methods to monitor these elements are presented. A unique aspect of this approach is exploring additional routines which can be incorporated in the process to identify machine specific problems. As explained within the paper, the Failure Mode and Effects Analysis shows that the resulting quality in a case study from a precision assembly task is dependent on the precision of the rotational axis. Although the rotational axis plays a significant role in the resulting error, it is hard to explicitly find a correlation between its degradation and produced parts. To overcome this, an additional routine is added to the production process, which directly collects information about the rotational axis. In addition to the overall concept, this routine is discussed and its ability to monitor the rotational axis is confirmed in the paper.

Resistance Welding of Hybrid Structures Made of Fibre-Reinforced Plastics and Steel Using Special Connecting Elements Made of Metal

Obruch O., Jüttner S., Ballschmiter G., Kühn M., Dröder K.

Biuletyn Instytutu Spawalnictwa w Gliwicach

2016

Vol. 60, No. 5

60--66

Przedstawiono technologię termicznego spajania materiałów kompozytowych i elementów metalowych, tworzących konstrukcje hybrydowe, za pomocą pomocniczych elementów łączących. Optymalizację wnikania tych elementów w materiał kompozytowy prowadzono, wykorzystując proces iteracyjny, przy założeniu najniższego poziomu zniszczenia tego materiału. W artykule przedstawiono ponadto zasadnicze wymagania odnośnie zgrzewania elementów pomocniczych w odniesieniu do perspektyw tego procesu. Przedstawiono i przeanalizowano różne koncepcje połączenia tych elementów. Zwrócono uwagę na zastosowanie niskiego poziomu energii wprowadzonej do materiału, w celu zminimalizowania zniszczenia cieplnego materiałów kompozytowych, i wynikający stąd wymóg nowego podejścia do zgrzewania punktowego. Biorąc pod uwagę powyższe, przedstawiono wybrane rozwiązania. Opisano również właściwości mechaniczne złączy i parametry zgrzewania.

This article considers the technology of thermal welding of new auxiliary elements for the connection of composite materials and metal components in hybrid structures. As the basis, the iterative adjustment process of optimization penetration into the composite material with the lowest level of material damage is used. Also, in this paper, the main requirements, which appear through the process of the welding element adjustment, are considered from the welding prospective. Various concepts of elements connection will be represented and analyzed. Moreover, the achievement of low energy input in a base material in order to minimize the thermal damage of the composite materials will be showed. Therefore, new approaches in resistance spot welding are required and some of them are represented in this article. Despite the obtained welding joints, the ar¬ticle also represents their mechanical characteristics and welding parameters.