Rapid prototyping technology - Process
l) product 3D model. As the RP system is directly driven by the 3D CAD model, so we must first build the workpiece

Rapid Prototyping 3D CAD model. Three-dimensional CAD model of the computer-aided design software can be used (such as Pro / E, I-DEAS, SolidWorks, UG, etc.) directly to construction, existing products can also convert two-dimensional pattern formation of three-dimensional model, or product entities laser scanning, CT scan obtained point cloud data, and then use Roll former reverse engineering approach to construct three-dimensional model. 2) three-dimensional model of the approximate treatment. As the products are often a number of irregular surface, processing similar to the model before treatment, to facilitate subsequent data processing. STL file format as the format is simple, practical, rapid prototyping has become the field of pre-standard interface file. It is flat with a series of small triangles to approximate the original model, each small triangle with three vertex coordinates and a normal vector to describe the size of the triangle can be selected according to accuracy. STL file has two kinds of binary code output code and ASCll form, the form of share binary code output code space than ASCII files output forms the space is much smaller, but the ASCII code output format can read and check. Typical CAD software with a conversion and output STL format files. 3) three-dimensional model of the slicing. According to the characteristics of the processed model select the appropriate processing direction, the direction in forming a high plane with a series of intervals after cutting approximate model to extract the cross section of the profile information. Interval generally take 0.05mm ~ 0.5mm, common 0.1mm. The smaller the interval, the higher the precision molding, but the longer molding time, the lower efficiency, otherwise the precision is low, but high efficiency. 4) molding. According to sections dealing with the section profile, under the control of the computer, and the corresponding forming head (laser head or nozzle) according to the section profile information to do scanning movement, the table level by level in the accumulation of material, and then layers Bonded finally get prototype. 5) forming part of the post-processing. Remove the molding from the molding system in pieces, for grinding, polishing, Coating, or placed after the high temperature sintering furnace to further enhance its strength.