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Comparative Evaluation of Marking Methods on Cast Parts of Al-Si Alloy with Image Processing

: Deng, Fangtian; Li, Rui; Klan, Steffen; Volk, Wolfram

Fulltext urn:nbn:de:0011-n-6389569 (4.6 MByte PDF)
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Created on: 25.8.2021

International journal of metalcasting : IJMC (2021), Online First, 18 pp.
ISSN: 1939-5981 (Print)
ISSN: 2163-3193
Journal Article, Electronic Publication
Fraunhofer IGCV ()
Gießen (Urformen); Rückverfolgbarkeit; Aluminiumlegierung; Siliciumlegierung; Bildverarbeitung; Markierung; Qualitätssicherung; code symbol quality; casting traceability; casting process; marking methods; Al-Si alloy; image processing

Quality issues caused by casting defects are commonly complicated to solve, because the part-specific process parameters are not traced to the individual cast part. This problem can be mitigated by the traceability of each cast part with an identifier code. Therefore, a study of the influence of marked surface topography and post-treatments on code symbol quality is desirable for a well-designed traceability system. In this work, the code symbol quality of laser, dot peen, and electrolytic marking methods on three as-cast surfaces of Al–Si alloy, after sandblasting and heat treatment, is evaluated comparatively with a customized image processing software. The result shows that the laser marking method produces the highest performance for different as-cast surfaces; electrolytic marking provides acceptable results only on the smooth surfaces of high-pressure die casting; dot peen marking produces the codes of high symbol contrasts, which are similar to those of laser marking, especially for rough as-cast surfaces of sand casting. However, for all marking methods, the code qualities of all surface topographies decrease substantially after post-treatments. Considering that dot peen marking has satisfying performances as well as low equipment and maintenance costs, this method is more suitable for small- and medium-size foundries to start to trace each cast part in an economical manner.