Patent ID: 7137431
Filing Date: 2006-11-21
Classification: B22C,B22F,B29C,B33Y

Abstract:
1. A method for pattern building in layers, comprising the steps of: a) feeding material including a molding sand to a work piece platform that is positioned within a frame of a pattern building device, the workpiece platform being height adjustable, the workpiece platform being essentially rectangular in plan view, and the workpiece platform having a pair of longer edges and a pair of shorter edges when viewed from the top; b) spreading the material including the molding sand by translating a spreader along at least one of the shorter edges of the rectangular cross-section of the workpiece platform; c) selectively contacting the material including the molding sand with a casting resin and curing agent; d) curing the casting resin in contact with the molding sand for forming a cured layer; e) adjusting the height of the workpiece platform; f) successively repeating at least steps (a)–(d) until a metal casting mold pattern is completed; g) and balancing out sag of the spreader along its length.