A compressor wheel is re-designed to permit die inserts (20), which occupy the air passage and define the blades (4, 5) during a process of forming a wax pattern (21) of a compressor wheel, to be pulled without being impeded by the blades. This modified blade design enables the automated production of...http://www.google.fr/patents/US6663347?utm_source=gb-gplus-shareBrevet US6663347 - Cast titanium compressor wheel
