Method for producing profiled product having fins

Abstract From the Canadian patent

Abstract of the Disclosure:, The method of producing a profiled porduct having fins such as all impeller having vanes impossible to be formed directly by casting without collapsible cores comprises the steps of first producing by the casting a preliminary product having fins of the shape capable of directly formed by the casting, a concave filled out portion being provided at one side of the root of each fin varying its size or amount along the length of each fin depending upon the required final shape of the fin, while a corresponding cut out portion is formed at the opposite side of the root of each fin at the position corresponding to the above described concave filled out portion, and …