Manufacturing – Casting methods - European Aluminium Association
Manufacturing – Casting methods - European Aluminium Association
Manufacturing – Casting methods - European Aluminium Association
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
1.12.3 Coating & embedding<br />
Coating: The clusters are coated with a refractory coating layer by immersion in a water<br />
soluble ceramic slurry. The coating layer has the function of guiding the gasification process<br />
of the pattern and to form a barrier between the moulding material and the gas-filled bubble<br />
which exists between the still solid EPS-pattern and the intruding aluminium melt. After the<br />
coating has dried, a thin, hard and permeable coating remains. The coatings are typically<br />
applied to a foam cluster by dipping, spraying or pouring.<br />
Embedding in sand: After the coating has dried, the cluster is placed in a flask and backed<br />
up with unbonded quartz sand without chemical additives. The sand is compacted through<br />
vibration with various frequencies, which causes the sand to fill all hidden cavities of the<br />
patterns.<br />
Production steps<br />
Source: LWF/ZVG Paderborn<br />
Coating of a cluster with two cylinderheads<br />
Source: BMW AG Landshut<br />
Version 2002 © <strong>European</strong> <strong>Aluminium</strong> <strong>Association</strong> (auto@eaa.be) 76
Change language