Abstract: A method for producing a three-dimensional shaped product having an undercut region on the upper side and an interior space forming region on the lower side, by lamination of powder, sintering of a laminated layer and cutting of the sintered layer, includes the steps of, when a cutting path where the side is a location of the top edge of the interior space that has been created during creation of horizontal cutting paths for cutting of the interior space forming region, setting by the CAD/CAM system a command for carrying out further lamination at the location of the top edge, or creating a horizontal cutting path on a location on an upper side above the horizontal cutting path by a cutting width and setting a command to the cutting tool for terminating cutting along the cutting path, thereby avoiding having to cut a created horizontal cutting path.

Abstract: A three-dimensional shaping method including the steps, after a lamination step, in which steps of forming a powder layer, flattening with a squeegee and sintering are repeated, followed by cutting of the surface of the laminate, 1. setting the overall shape of an object to be shaped by a CAD/CAM system, and setting machining units that form the overall shape and cutting allowances on peripheral sides and upper sides of each of the machining units, 2. cutting of the peripheral sides and upper sides according to a prescribed order, after lamination with addition of a cutting allowance on the peripheral sides of each machining unit, and after carrying out lamination to the thickness of the cutting allowance on the upper side of the machining unit and the machining unit adjacent above the machining unit, and 3. continuing repetition of step 2, from the lowest to the topmost machining unit.

Abstract: A three-dimensional shaping method including the steps, after a lamination step, in which steps of forming a powder layer, flattening with a squeegee and sintering are repeated, followed by cutting of the surface of the laminate, 1. setting the overall shape of an object to be shaped by a CAD/CAM system, and setting machining units that form the overall shape and cutting allowances on peripheral sides and upper sides of each of the machining units, 2. cutting of the peripheral sides and upper sides according to a prescribed order, after lamination with addition of a cutting allowance on the peripheral sides of each machining unit, and after carrying out lamination to the thickness of the cutting allowance on the upper side of the machining unit and the machining unit adjacent above the machining unit, and 3. continuing repetition of step 2, from the lowest to the topmost machining unit.

Abstract: A method for automatic creation of a cutting path in an interior space of a three-dimensional shaped product formed in a CAD/CAM system, includes the steps of separately forming an upper region and a lower region by lamination and sintering; defining a horizontal plane at an intermediate location between an upper end of the lower region and a lower end of the upper region; first creating, on the interior wall sections of the lower region below the horizontal plane, data of horizontal cutting paths; then second creating data, on the interior wall sections of the upper region above the horizontal plane, data of horizontal cutting paths; placing the upper region on the lower region at a position of the horizontal plane; and joining the cutting paths of the upper and lower regions at the horizontal plane in order to form the three-dimensional shaped product.

Abstract: A method for automatic creation of cutting paths 5 in the interior space 2 of a three-dimensional shaped product 1 by the following steps, in a CAD/CAM system in which programs are designed for lamination, sintering and cutting that are necessary for creating a three-dimensional shaped product 1: defining an imaginary horizontal plane 3, creating cutting paths 5 in the interior wall section from the lower end successively toward the upper side, creating cutting paths 5 in the interior wall section toward the upper side to the upper end, and joining the cutting paths 5 of step 2 and the cutting paths 5 of step 3.