Plastic and nonmetallic article shaping or treating: processes – Laser ablative shaping or piercing
Patent
1995-08-24
1998-11-10
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Laser ablative shaping or piercing
264 401, 264130, 264163, 264219, 264246, 264308, 264317, 264401, 264496, 264221, 164 98, 164456, 156257, 156264, 1562755, 156353, 425 87, 425 90, 425176, 425375, B29C 3340, B32B 3100
Patent
active
058339140
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for molding a laminate having a desired shape by laminating solidifying layers, and an apparatus used for the method, and particularly, to a laminate molding method and a laminate molding apparatus in which a releaser is printed by a press.
BACKGROUND ART
Conventionally, in development of new products, the fabrication of trial productions has been widely carried out. For example, in the automobile industry, in designing new model vehicles, first, a scale-down three-dimensional model is produced by way of trial, and design is studied, after which a three-dimensional model is again produced by way of trial to gradually determine the design of detailed portions. In this case, if a model is a three-dimensional model of a simple shape, preparation of a Numerical Control (NC) tape, management of knife edges and the like are necessary but the three-dimensional model can be comparatively easily formed using mechanical cutting means or the like. However, if a model is a three-dimensional model having a complicated shape, there exist problems in that it takes time for the molding by the mechanical cutting means and it is difficult to shape the detailed portions.
In view of the foregoing, a laminate molding method has been put to practical use as a method which, even in molding a simple three-dimensional model, requires no preparation of an NC tape, easy in the management of knife edges, and can shape even a three-dimensional model having a complicated shape in a short period of time. Such methods include, for example, a method for forming a mask pattern on a mask plate by an electrostatic toner, on the basis of data inputted into a computer in advance, placing the mask pattern on a resin layer coated with a photo-hardening resin to irradiate an ultraviolet light thereon, sufficiently exposing it, thereafter attracting an unhardened resin layer, filling with wax a clearance formed by removing the photo-hardening resin, thereafter cooling the wax, and repeatedly cutting the hardened resin layer and the wax to obtain a desirably-shaped three-dimensional model, and a method for forming a hardened layer by a photo-hardening resin and a solidifying material.
In such a laminate molding method as described above, the photo-hardening resin is widely used as a molding material. Other methods include a method for obtaining a three-dimensional model having a desired shape by superposing a plurality of layers each formed from ordinary paper or the like while putting cuts therein, and a method of obtaining a three-dimensional model by pressing a powder of a solidifying material into a hard lump to form a thin powder layer, applying a laser irradiation light thereto to thereby repeat sintering the portion to be irradiated to laminate the hardened layers, these methods being put to practical used.
According to these laminate molding methods, an inverted-warp model or the like can be easily formed, which has been heretofore difficult by mechanical cutting means or the like. Further, a model provided with a precise construction can be formed.
However, in the method for forming a mask pattern, hardening a desired photo-hardening resin by an ultraviolet light having transmitted through the mask pattern, and filling with wax to obtain a three-dimensional model, there existed a problem in that the step of attracting a surplus photo-hardening resin is necessary, as a result of which noises resulting from the attraction are generated, and when the surplus photo-hardening resin is attracted, resins of finely shaped portions are absorbed or the surplus resins remained in the fine portions, failing to obtain a model having a high precision, particularly a model whose contour portion is high in precision.
Further, in this method, the cutting is carried out in order that after the wax has been filled, the layers comprising the photo-hardening resin and the wax are arranged into a predetermined thickness in preparation for coating of a successive layer. However, there exists a problem
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Eashoo Mark
K-Net Systems, Inc.
Silbaugh Jan H.
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