Patent UA-92226-C2 (UA)
Title: method of manufacturing one-time pattern
Inventor: SHYNSKYI OLEH YOSYPOVYCH
IPC: B22C9/04
Filed: 2008-12-04
Abstract: The invention relates to metallurgy, in particular to a method of manufacturing an one-time pattern of foamed plastics, according to which individual flat elements are made including parts of a gating system that are assembled into a single structure, according to the invention, and then they are folded into tubes or other spatial structures. In the flat elements of the polystyrene prior to folding in the place of bending recesses are made in parallel to the axis, around which folding is conducted, and the recesses are located from the concave surface of element after folding leaving the minimum thickness of the element body to at least 0.1-4 mm at the depth of each recess. Also the flat element can be produced continuously and folded into a continuous tubular structure, and the flat elements can be made as two-dimensional lattices that are geometrically similar, increased in proportion to the scale and with a structure similar to the crystal lattices used to visualize the internal structure of the crystal by a framing grid, which nodes coincide with the centers of particles, the areas between the nodes of model lattice are made in the form of walls connected in the nodes. In addition, the flat elements can be folded into a form closest to the cylinder, and the parts of gating system can be made in the place of closing the ends of folded element in the form of a thickening, which is located along the entire model. The flat elements can be also folded so that the cross section for S-shaped bending a structure is obtained of two connected tubes in the cross-section of a figure 8, and inside the tubular structure at least one partition may be placed that can be made in the form of two-dimensional lattices of a material identical to the material of the tubular structure. In addition, the walls of tubular structure of folded elements can be made impermeable for sand mixture, and the ends of tubular structure may be closed by lids, also impermeable for sand mixture, or the walls and lids may be covered by a synthetic film that does not allow sand mixture to penetrate inside the tubular structure. On the wall of flat element a synthetic film or mesh can be placed, and at the depth of recess the thickness up to 5-6 mm is maintained. The sum of angles of the wedge-shaped recesses can be 360°, and when folding the sides of wedge recesses are linked so that the decrease of thickness of the flat element due to performing recesses does not reduce the thickness of element wall in the folded form. In addition, the flat elements can be made as a two-dimensional hexagonal lattice with cells in the form of an equilateral hexagon, and they can be folded into the structures similar to the structure of a carbon nanotube. A partition installed inside the tubular wall can contract or strut the tubular structure and change its external size, in the case the parts of two-dimensional lattices may be deformed or bent and in the places of bending and on them wedge recesses can be made from the side of formation of a concave surface. The flat elements can be folded in such a manner that two walls of each cell of the hexagonal two-dimensional lattices are located perpendicular to the axis, around which the folding is carried out. The invention provides producing the spatial tubular design from the flat elements made of foamed plastics.