초록 ▼

After sand of one layer is loaded into a sand layer elevator (20), a shading mask (38) is positioned above the sand, and a diffused laser beam is irradiated from a diffused laser irradiating source (16). Thereby, a predetermined range of sand under the shading mask (38) is exposed and this exposed p

After sand of one layer is loaded into a sand layer elevator (20), a shading mask (38) is positioned above the sand, and a diffused laser beam is irradiated from a diffused laser irradiating source (16). Thereby, a predetermined range of sand under the shading mask (38) is exposed and this exposed portion is cured. This operation is repeated for a predetermined number of sand layers and cured portions are piled up to directly form a 3-D sand mould. Particularly, a diffused laser beam is used to cure a wide range of sand at a time, thereby making sand mould mass-production possible.

대표청구항 ▼

[ What is claimed is:] [1.] A method for forming a sand mould as a 3-dimensional form comprising the steps of:(a) forming a sand layer by accumulating sand coated with a thermosetting resin in the form of a thin layer;(b) arranging a mask having an opening in a predetermined portion above the formed

[ What is claimed is:] [1.] A method for forming a sand mould as a 3-dimensional form comprising the steps of:(a) forming a sand layer by accumulating sand coated with a thermosetting resin in the form of a thin layer;(b) arranging a mask having an opening in a predetermined portion above the formed sand layer;(c) heating a portion of the sand layer located below the opening through the arranged mask to solidify the portion;(d) forming one layer of a sectional form of the sand mould; and(e) piling up sectional forms to form a sand mould as a 3-dimensional form by repeating steps (a)-(d) by irradiating a diffused laser beam onto the sand layer through the mask to heat an exposed portion of the sand layer. [11.] A method for forming a sand mould as a 3-dimensional form comprising the steps of:(a) forming a sand layer by accumulating sand coated with a thermosetting resin in the form of a thin layer;(b) arranging a mask having an opening in a predetermined portion above the formed sand layer;(c) heating a portion of the sand layer located below the opening through the arranged mask to solidify the portion;(d) forming one layer of a sectional form of the sand mould; and(e) piling up sectional forms to form a sand mould as a 3-dimensional form by repeating steps (a)-(d); rein the mask is manufactured based on a mask form obtained after the arrangement of supports by the following steps:creating a mask for based on a 2-dimensional sectional form of a casting form; andautomatically arranging supports at predetermined intervals in the space; portion surrounding the detected island portion based on parallel lines arranged at predetermined intervals. The method for forming a sand mould according to claim 11, wherein, in the step of automatically arranging supports, the positions of the supports are made different between masks used for adjacent layers. The method for forming a sand mould according to claim 11, wherein, in the step of automatically arranging supports, the positions of the supports are made different among masks used for at least three adjacent layers. The method for forming a sand mould according to claim 11, wherein, in the step of automatically arranging supports, the island portion is judged by a closed outline and a support connecting the same outline is removed as unnecessary. The method for forming a sand mould according to claim 11, wherein the mask is manufactured by machining a sheet metal by a laser based on a mask form in which supports have been arranged. A method for forming a sand mould as a 3-dimensional form comprising the steps of:(a) forming a sand layer by accumulating sand coated with a thermosetting resin in the form of a thin layer;(b) arranging a mask having an opening in a predetermined portion above the formed sand layer;(c) heating a portion of the sand layer located below the opening through the arranged mask to solidify the portion;(d) forming one layer of a sectional form of the sand mould; and(e) piling up sectional forms to form a sand mould as a 3-dimensional form by repeating steps (a)-(d); rein the mask is manufactured based on a mask form obtained after the arrangement of supports by the following steps:creating a mask form based on a 2-dimensional sectional form of a casting form;detecting an island portion surrounded by a space portion from the thus created mask form; andautomatically arranging supports in the space portion surrounding the detected island portion based on a lattice of supports arranged at predetermined intervals. A method for forming a sand mould as a 3-dimensional form comprising the steps of:(a) forming a sand layer by accumulating sand coated with a thermosetting resin in the form of a thin layer;(b) arranging a mask having an opening in a predetermined portion above the formed sand layer;(c) heating a portion of the sand layer located below the opening through the arranged mask to solidify the portion;(d) forming one layer of a sectional form of the sand mould; and(e) piling up sectional forms to form a sand mould as a 3-dimensional form by repeating (a)-(d); rein the mask is manufactured based on a mask form obtained after the arrangement of supports has been changed by the following steps:creating a mask for based on a 2-dimensional sectional form of a casting form;detecting an island portion surrounded by a space portion from the thus created mask form;automatically determining the arrangement positions of supports for supporting the island portion based on predetermined rules; andchanging the position of an automatically arranged support according to a connection state between the island portion and the support. The method for forming a sand mould according to claim 17, wherein the position of the support is changed based on the stability of the island portion which is judged from the center position of the island portion and the connection position of the support with the island portion. A method for forming sand mould for producing a casting using the sand mould comprising the steps of:(a) forming a sand layer by accumulating sand coated with a thermosetting resin in the form of a thin layer;(b) arranging a mask having an opening in a predetermined portion above the formed sand layer;(c) heating a portion of the sand layer located below the opening through the arranged mask to solidify the portion by irradiating a diffused laser beam onto the sand layer through the mask to heat an exposed portion of the sand layer;(d) thereby forming one layer of a sectional form of the sand mould;(e) piling up sectional forms to form a sand mould as a 3-dimensional form by repeating steps (a)-(d); andproducing a casting using the thus obtained sand mould.