Casting of Microstructured Shark Skin Surfaces and Possible Applications on Aluminum Casting Parts
Within the project Functional Surfaces via Micro- and Nanoscaled Structures which is part of the Cluster of Excellence Integrative Production Technology established and financed by the German Research Foundation (DFG) , an investment casting process to produce 3-dimensional functional surfaces down to a structural size of tum on near-netshape- casting parts will be developed. The common way to realise functional microstructures on metallic surfaces is to use laser ablation, electro discharge machining or micro milling. The handicap of these processes is their limited productivity. The approach of this project to rAlse the efficiency is to use the investment casting process to replicate microstructured surfaces by moulding from a laser-microstructured grand master pattern. The mAln research objective deals with the investigation of the single process steps of the investment casting process with regard to the moulding accuracy. Actual results concerning making of the wax pattern, suitability of ceramic mould and core materials for casting of an AlSi7MgO. 3 alloy as well as the knock-out behaviour of the shells will be presented. Using the example of an intake manifold of a gasoline race car engine, a technical shark skin surface will be realised to reduce the drag of the intake Alr. The intake manifold consists of an Alrrestrictor with a defined inner diameter which will be microstructured with technical shark skin riblets. For this reason the inner diameter cannot be drilled after casting and demands a very high accuracy of the casting part. A technology for the fabrication and demoulding of accurate microstructured castings will be shown. Shrinkage factors of different moulding steps of the macroscopic casting part as well as the microscopic riblet structure will be examined.
investment casting microstructured surtacesishark skin
Todor Ivanov Andreas Biihrig-Polaczek Uwe Vroomen
Foundry Institute of RWTH Aachen University, Intzestrasse 5, Aachen, 52072, Genrumy
国际会议
69th World Foundry Congress(第69届世界铸造会议 WFC 2010)
杭州
英文
777-780
2010-10-16（万方平台首次上网日期，不代表论文的发表时间）