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Laser rapid prototyping technology is a new technology developed in the last 80 years. He is a multi subject synthesis technology of laser technology, CAX technology, automatic control technology, new material technology, direct modeling, rapid manufacturing product model, laser rapid prototyping technology, laser rapid prototyping technology, ", ", ", ", and the technology of laser rapid prototyping.

 1、Basic principle of Laser Rapid Prototyping

The principle of laser rapid prototyping technology is generated by a CAD, 3D solid model, through two-dimensional layered software layers, each thin section data for driving and controlling laser beam, fire liquid, powder, or sheet material, processing the request shape of thin layer, layer by layer accumulated to form a solid model. Most of the traditional industrial forming techniques follow the method of material removal, such as turning, milling, drilling, grinding, cutting, and other parts of the mold to form, such as casting, stamping. The laser rapid forming is adopting a new forming principle of — — hierarchical processing, superposition forming. And laser rapid prototyping technology rapid manufacturing of model or sample can be directly used for validation of new product design, functional verification, engineering analysis, market order decision of enterprise level, shorten new product development cycle, reduce development costs, improve the competitiveness of enterprises. Laser rapid prototyping is divided into the following categories:


(1) SL&mdash (Stereolithography, orSLA) will be controlled by a computer controlled by a UV laser at the predetermined part of the profile of the layered cross section of the profile of the liquid photosensitive resin by point scanning, scanning the resin layer produced by the light polymerization reaction curing forming part of a section, and then deposited on a new layer of liquid resin scanning processing, so repeated until the entire prototype is finished. This method is characterized by high precision, good surface quality, can create complex, particularly fine parts, the shortage is expensive equipment and materials, manufacturing process needs to design support. (2) 分层实体制造(LOM—Laminated Object Manufacturing) LOM process is based on the part of the profile information obtained by laser cutting thin material, will be obtained by the hot press device and the layer of adhesive, and then a new layer of paper superimposed on the above, in turn bonded into a three-dimensional entity. LOM is mainly characterized by low cost of equipment and materials, the strength of the products is good, and the accuracy is higher. Helisys company developed a variety of LOM process with the molding material, can be used in the production of sheet metal forming parts, the company also developed based on ceramic composite materials LOM process. (3) Selective laser sintering(SLS —Se1ected Laser Sintering) SLS is the use of a laser selective layer of the sintering of solid powder, and the formation of the solidified layer of the formation of the formation of the required shape of the parts. The whole process includes the establishment of CAD model and data processing, the development of powder, sintering and postprocessing. The most prominent advantage of SLS is that it is used in a wide range of molding materials. In theory, it can be used as the material of the powder material which can form an atomic bond after heating. At present, the material of SLS forming process can be made of paraffin, high polymer, metal, ceramic powder and composite powder materials. Because of the wide variety of SLS forming material, the saving of materials, and the distribution of the forming parts, it is suitable for many kinds of applications, and SLS has no need to design and manufacture complex supporting system, so its application is more and more extensive. But the SLS is a mixture of a metal material and other low melting point materials, which could be a low melting point metal or organic bonding material, in process, low melting point materials molten or partially molten, but with a high melting point metal material does not melt, but was molten or partially molten materials with lower melting temperature of coating and bonding together, formation of the three-dimensional entity is similar to powder metallurgy sintering blank, entity a certain proportion of pore and can not achieve 100% density, mechanical performance is poor, often need to after remelting high temperature or metallic cementation filling the hole gap after treatment to use. (4) Laser cladding forming(LCF - Laser Cladding Forming) LCF is a surface layer which is made by laser irradiation, which is based on the surface of the substrate, which is the same as the substrate surface, which is a combination of low temperature, low temperature, and the surface layer. LCF is a surface modification method based on laser as heat source in the surface of the substrate, forming a layer of alloy with different composition and properties. LCF can be used to realize intelligent and automatic processing; the appearance of the cladding layer, the appearance of the cladding layer, the deformation of the cladding layer, the deformation of the workpiece, the workpiece can not be processed and directly used; suitable for the key parts of the processing; the heat affected by Yu Jiguang has approximate adiabatic fast heating process. The laser cladding has little effect., therefore, laser cladding has been widely used in many fields, such as aviation, automobile, chemical, mechanical and so on. It is being paid more and more attention by more and more research institutions and enterprises. But the crack is the most difficult problem in the large area laser cladding technology, scientists are working hard at home and abroad.
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