Supersonic fluidic oscillator development for use in metal super plastic forming processes

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The Super Plastic Forming (SPF) process is a manufacturing technique which involves using a supply of high pressure compressed air to form a heated metallic (usually aluminium or magnesium) sheet over the forming surface of a die. The technique is primarily used in the production of aluminum vehicular body panels commonly found in the automotive and aerospace industries. In order to avoid cracking and tearing of the metal , the process must be accomplished over a fairly long period of time. This allows any residual stresses to be relaxed. AEM Power Systems Inc. (AEM) located in Windsor, Ontario has, over the past few years, been developing a technique which potentially allows the forming process to be accomplished in a much shorter time. This would allow greater productivity of the process. The idea is to impose pressure fluctuations onto the mean forming pressure curve and thus allow partial stress relief during each fluctuation cycle which would