Rapid Prototyping And Manufacturing Of Three
Three-dimensional Print Forming This molding method is most people in the world of technology the most mature and widely used as a rapid prototyping method. 1984, three-dimensional printing prototyping technology is still in the laboratory research stage, 1988, the first commercially operational manufacturing system. 1989 American Chryster first practical application of this technology works, but until 1992 only adequate attention. Pioneer of the technology in the United States 3DSystem company, it is also the first RP world’s largest manufacturer of market share of about 30%, the production of SLA products came out top, and a monopolistic market.
1) process principle Three-dimensional printing prototyping (SLA-StereolithagraphyApparatus), also known as stereo lithography, light curing. The basic technological principle (Figure 4) is required for use of CAD for the prototype three-dimensional geometric modeling, data files produced and processed into the surface of the model. The model with a small triangle inside and outside the plane of the surface discretization, are now widely used rapid prototyping manufacturing system, the default is the industry standard STL (Stereolitho-graphy) file format. Ranging from equal distances, or by treatment of split models, formed from the bottom to the top of the horizontal section of a series of parallel layers, through the computer model will face split into a series of cross-section. Scan line algorithm using slice each section, including section contour path and generate the internal scan path of both the best path. While forming the model positioning system, design the support structure.
Slice information and path information generated as the control machine of the command file (CLI file), and to compile the instructions given away at all levels of the NC machine. The thinner the layer, the higher the precision parts produced using different thickness layer aims to speed up forming speed.
Laser machine in the laser beam scanning by numerical order, so that the containers containing the liquid photosensitive resin cured layer by layer, and bonding together. Curing process of the work platform from the first layer of liquid began, when the first layer is cured, the work platform along the Z axis down some distance (ie layer thickness, and consider the material and technological factors), so that the new layer of liquid resin coverage In the solidified layer above a second layer of curing. Repeat this process until the last layer of curing is completed, the prototype will generate three-dimensional entity. Liquid Tank liquid photosensitive resin in the dress in a certain wavelength (eg 325nm) and the intensity of UV laser irradiation will be cured within a certain region that is the formation of solidification point. Forming the beginning, the work platform at a set depth under the surface, such as 0.05 ~ 0.2mm. Focused laser spot on the surface point by point by scanning the computer’s instruction that cured one by one. When the layer of laser scanning is not completed resin is still liquid. Then driven platform lift frame further down the level of forming a layer of height just above it, covered with a layer of resin then scan the second layer to form a new, layer has been cured with some firmly together.
On laser deflection scanning of the molding machine, since the laser beam is deflected shot but when the focal length and the material surface spot size is changed, which directly affect the thin layer of curing. To compensate for focal length and spot size laser beam scanning speed of change must also be real-time adjustments. In addition, when the scanning speed of production of the thin layer must be processed according to changes in material thickness (layer thickness) and make adjustments.
2) system components Usually forming system consists of three-dimensional laser printing, XY movement deflection device or laser scanner, photosensitive liquid polymer, polymer containers, control software, and lifting tables and other components.
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