A method for forming thinned areas in a thin sheet material. The method includes the steps of (1) placing the thin sheet material on a pattern anvil having a pattern of raised areas wherein the height of the raised areas is generally less than the thickness of the sheet material; (2) conveying the sheet...http://www.google.es/patents/US5466401?utm_source=gb-gplus-sharePatente US5466401 - Process for hydrosonically area thinning thin sheet materials
Process for hydrosonically area thinning thin sheet materials
