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Ökonomische Prozessanalyse und Modellintegration zur Kostenberechnung von Faser-Kunststoff-Verbunden

  • The introduction to the topic is a description of the techno-economic evolution of composites. Apart from this, today’s market state of the art of composites is also explained. As a conclusion, the principal trend towards the higher quality by the increased application of carbon fibers is ascertained. In particular, it is pointed out that the restraints of the market growth are mainly caused by the high price, most notably, of the fiber materials. This situation, in connection with the maturation of the composite manufacturing processes, demands the need of a cost calculation tool. In the second step, former composite cost models and their implementations into software – if available – are described and benchmarked. As a result it is proposed to combine, different approaches because of their fundamental potential as well as the deficits. It is suggested to use a resource-based methodology combined with the PBKM (prozessbasierte Kostenmodellierung = process-based cost modelling) and to implement the models in a cost calculation software. The first aim is an economic process analysis which is carried out to receive an abstract and modular system. Thereby, it is possible to describe the production processes by successive refinement more and more detailed. The process is divided in multiple steps which are itself subdivided in technical activities or handlings. The relevant cost objects with the identifiable cost positions are assigned to those handlings. This approach assures modularity and offers the possibility of an easy software implementation. In addition, the functionality of this methodology is demonstrated considering the two examples “thermoplastic tape placement” and “continuous pressing”. For that reason these composite manufacturing techniques are analyzed and the structure is mapped within the use of suggested methodology. The next topic deals with the modelling of the cycle time for the thermoplastic tape placement with the use of the PBKM. Within this methodology the derivation of the cycle time depends only on physical process parameters, which results in a geometrical complexity based model. The developed model is verified by comparing of the theoretically derived values with practical experiments. Along with this, the assumptions for this model are revised and verified. As a technical enhancement of the tape placement process, different designs of a geometry-adaptive consolidation role are introduced. This technical extension of the process technology is necessary for the final verification of the model. The new consolidation unit enables to move all geometrical degrees of freedom and complexities with the same laminate quality. Finally, a possibility to transfer the methodology of the PBKM to other technologies is proved. Therefore, it is offered a modus operandi how the continuous pressing technique can be modelled with the help of the PBKM. The last chapter deals with the cost calculation tool concerning the structural configuration, design, and functionality of the software. It is the consequential synthesis of the results of the economic process analysis and the cycle time models. The practicability of the modularity is proved by its application in the design phase of the software and by the integration of the modelling into the tool. The developed cost calculation software for composite manufacturing processes offers a standardization of the inputs and calculation algorithms by the use of introduced process analysis, the subdivision into smallest units. The cycle time calculation models are process specific know-how which can easily be used unlike an expert's system. The separation of the single functional entities assures a stringent data management, possibilities for the advancement, and furthermore, the variableness of representation and reuse of the derived data. The functionality of the cost tool concerning evaluations and comparisons are pointed out with two case studies. Plus, the postulated transferability of the methodology on other composite technologies is demonstrated. The main advantage of this system is that the modelling offers economical statements of different process variations without experimentation. Besides, the values ascertained by the PBKM are more precise compared to other existing models. Therefore, the PBKM can be the basis for investment decisions like technology change or modifications and helps to identify techno-economic limitations and potentials. This version of the cost calculation software offers only the standard repertoire of cost evaluations and comparisons which turn out to be upgradeable. Thus, there exists potential to enhance the functionality concerning sensitivity analyses, the integration of cycle time models for other composite processing technologies, and further possibilities for the graphic processing. As a conclusion the software with the combination of different attempts offers a good starting position with respect to the current evolution status and should be extended.
Author:Jens Schlimbach
URN (permanent link):urn:nbn:de:hbz:386-kluedo-47543
Serie (Series number):IVW-Schriftenreihe (64)
Publisher:Institut für Verbundwerkstoffe GmbH
Place of publication:Kaiserslautern
Advisor:Peter Mitschang
Document Type:Doctoral Thesis
Language of publication:German
Publication Date:2017/08/16
Date of first Publication:2006/06/24
Publishing Institute:Technische Universität Kaiserslautern
Granting Institute:Technische Universität Kaiserslautern
Acceptance Date of the Thesis:2006/05/24
Date of the Publication (Server):2017/08/16
Number of page:VII, 130
Faculties / Organisational entities:Fachbereich Maschinenbau und Verfahrenstechnik
DDC-Cassification:6 Technik, Medizin, angewandte Wissenschaften / 620 Ingenieurwissenschaften und Maschinenbau
Licence (German):Creative Commons 4.0 - Namensnennung, nicht kommerziell, keine Bearbeitung (CC BY-NC-ND 4.0)