Accession Number : AD0451230

Title :   PRESSURE CASTING IN INVESTMENT MOLDS,

Corporate Author : FRANKFORD ARSENAL PHILADELPHIA PA

Personal Author(s) : Lipson, Samuel ; Ripkin, Fred

Report Date : 06 OCT 1964

Pagination or Media Count : 21

Abstract : A study was made of methods for pressure casting nonferrous alloys into investment molds. The experimental methods were compared with standard suction casting practices. The best method studied was the Direct Pressure Diaphragm Method. By this method, metal is forced into the mold in an upward direction with a high degree of control of metal stream velocity, turbulence, and casting pressure. Fluidity tests showed that improved filling of the casting section could be realized. Tensile tests showed that the incidence of defects in the casting cross-section could be substantially reduced. These effects were attributed to the attainment of lowered metal turbulence. Examples of large thin-sectioned aluminum castings are shown to demonstrate the utility of the process for so-called problem castings. (Author)

Descriptors :   (*MATERIAL FORMING, CASTING), (*CASTING, PRESSURE), ALUMINUM ALLOYS, COPPER ALLOYS, BRASS, MECHANICAL PROPERTIES.

Distribution Statement : APPROVED FOR PUBLIC RELEASE