Liquid metal forging process

Claim 1

A liquid metal forging process of the type including the steps of pouring liquid metal into the cavity of a mold, applying high pressure to said liquid metal by a punch which is inserted into said cavity with clearance space, and compressing said liquid metal until it solidifies, the improvement comprising the step of inserting between the surface of said liquid metal and a pressure applying surface of said punch a first sealing member made of a metal plate having a surface area to fit the crosssectional area of the mold and interposing between the first sealing member and the pressure applying surface of said punch a second sealing member made of a thin plate of a glassy substance having a melting temperature below that of the first-named sealing member and below the temperature of the metal to be forged, whereby said high pressure is applied through both said sealing members to said liquid metal, while simultaneously sealing the clearance space between said punch and the walls of said mold against entrance of liquid metal by deformation of the first sealing member to closely fit the mold, and the movement of said first sealing member along the wall of the mold is lubricated by melting of said second sealing member.