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Analysis of defect mechanisms in polishing of tool steels

 
: Klocke, Fritz; Dambon, Olaf; Behrens, Barbara

:
Postprint urn:nbn:de:0011-n-1718709 (3.3 MByte PDF)
MD5 Fingerprint: 24d8268075efa45d0a5c8456b4c4a734
The original publication is available at springerlink.com
Created on: 01.10.2012

Preprint urn:nbn:de:0011-n-171870-14 (3.3 MByte PDF)
MD5 Fingerprint: 24d8268075efa45d0a5c8456b4c4a734
The original publication is available at springerlink.com
Created on: 13.10.2012


Production Engineering. Research and development 5 (2011), No.5, pp.475-483
ISSN: 0944-6524
ISSN: 1863-7353
English
Journal Article, Electronic Publication
Fraunhofer IPT ()
production process; polishing; defect mechanism; Polieren; Feinbearbeitung; Defekt; Oberflächentechnik; Werkzeug- und Formenbau

Abstract
The polishing process in the mold and die making industries is nowadays still predominantly done manually. As a consequence of this the quality of the mold strongly depends on the worker's skill, experience and also on his form on the day, patience and concentration. Furthermore, polishing is in most cases the last manufacturing step of the process chain and occurring surface defects are critical and often a "knock-out-criterion". Until now there exists no systematical acquisition or explanation for the appearance of this polishing defects. This paper shows the results of experiments describing the polishing process and defect mechanisms in order to generate process strategies for manufacturing "defect-free" high-gloss polished tool steel surfaces. Ten different steel grades were analyzed in order to see how the final surface quality is influenced by e.g. the polishing system, the degree of purity or the microstructure. The surface quality is represented by roughness va lues and SEM-images. It could be concluded that the degree of purity and the homogeneity of the steel material are crucial to the final surface quality. The lower the amount of inclusions, the better the surface quality. Furthermore, a classification of the occurred defects during the polishing process is shown in this paper.

: http://publica.fraunhofer.de/documents/N-171870.html