Patent ID: 7459032
Filing Date: 2008-12-02
Classification: B21C,B21J,B22F,C10M,C10N

Abstract:
1. A pressurizing forming process comprising the steps of: heating a wrought or sintered metallic workpiece and/or a forming surface of a forming tool to a temperature of 100° C. or more; adhering a higher fatty acid-based lubricant on a surface of the wrought or sintered metallic workpiece and/or the forming surface of a forming tool by a dipping method in which said heated metallic workpiece is immersed into an aqueous solution consisting of water, an optional surfactant, an optinal antifoaming agent, and said higher fatty acid-based lubricant, or by a spraying method in which a dispersion consisting of water, an optional surfactant, an optional antifoaming agent, and said higher fatty acid-based lubricant dispersed in the water is sprayed onto said heated workpiece and/or said heated forming tool; and forming, wherein a lubricating film comprising a metallic soap, which is produced from the higher fatty acid-based lubricant by a chemical reaction and has a different composition than the higher fatty acid-based lubricant, is generated on a pressurized-and-contacted interface, at which the surface of the metallic workpiece and the forming surface of the forming tool are pressed against and are brought into contact with each other, in forming the metallic workpiece by pressurizing with the forming tool.