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Process Related Quality Management for Laser Sintering of Polyamide 12

A process related quality management method for the compensation of Polyamide 12 (PA 12) induced process and part properties deviations is presented as a basic concept for a quality assured series laser sintering production. In this context, deviations are caused by a strong interaction between the material and the process leading to an undesired deviation of part properties. With regard to laser sintering, material property changes occur due to processing conditions. Thermorheological investigations of systematically under process related condition aged PA 12 powders revealed a significant dependence of property changes to an combined time and temperature effect. With respect to these findings, a model was derived that is able to describe these property changes. Moreover, the model was used under utilization of processing knowledge within a model based predictive quality control and verified experimentally based on a relationship between process properties and model prediction. In addition, this relationship was used to define a processing window for process and material properties. The validation of the model based predictive quality control was done by a comparison of part properties whereas parts were produced based on a predicted parameter setup that represented a processing state inside and outside of the defined processing window. However, a clear confirmation for the effectiveness of the model based quality assurance in this study could not be concluded. Mainly, this result was reduced to differences between model prediction and experiment, i.e. differences that are related to the inhomogeneity of the melting characteristic and the sintering process which hence control the properties profile of additively manufactured parts as well as its deviations.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Christoph Mielicki

Christoph Mielicki
Lehrstuhl für Konstruktion und Kunststoffmaschinen
Universität Duisburg-Essen

Information

Free keywords: Quality assured production, laser sintering, polyamide 12, aging, thermorheo-logy, master curve, material model, quality control, compensation of part property deviations, process robustness
Institute / chair: Fakultät für Ingenieurwissenschaften, Abteilung Maschinenbau und Verfahrenstechnik, der Universität Duisburg-Essen
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Johannes Wortberg (Betreuer), Prof. Dr.-Ing. Gerd Witt
Publication year: 2014
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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