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231. Several common comparison of rapid prototyping technology 1

Always stood in the fast-leading position in the field of rapid prototyping technology include: FDM, SLA, SLS and LOM and other processes, and this process has several strengths and weaknesses, let's look at the main advantages and disadvantages of these types of technology comparison:

Filamentous material selectively cladding (Fused Deposition Modeling) rapid prototyping process is a laser as the shape does not depend on energy, and all kinds of wire (such as engineering plastics ABS, polycarbonate PC, etc.) heating and melting and then deposition modeling method, referred to as FDM.

Filamentous material selectively cladding works as follows: heated nozzles under the control of the computer, according to the product section of the part contour information for XY plane motion, thermoplastic filamentous material sent by the wire agencies for hot melt nozzle and the nozzle in the heating and melt into semi-liquid, and then was squeezed out, selective coating in the table, quickly cooled to form a layer of about 0.127mm thick, thin profile. After forming a layer of cross-section table down to a certain height, then the next layer of the cladding, as if a layer of "paint" section contour, and so on, forming three-dimensional product parts.

This process method can also be used for a variety of materials, such as engineering plastics ABS, polycarbonate PC, PPSF, and ABS and PC plastic hybrid materials. This process is clean, easy to operate, does not produce waste, and can be safely used in office environment, did not produce gas and chemical contamination. The concept for product design and product modeling the shape and functional tests. Specifically developed for medical materials ABS-i, because of its good chemical stability, can be gamma rays and other medical sterilization methods, especially suitable for medical use.

FDM rapid prototyping technology advantages are:
1, the manufacturing system can be used in office environments, there is no gas or chemical pollution;
2, a molding, easy to operate and does not produce waste;
3, the unique water-soluble support technology, making the removal of the support structure is simple, rapid construction of hollow bottle-shaped or molded parts and the assembly of a structure;
4, the volume of raw materials to form materials, easy handling and quick replacement.
5, the choice of a variety of materials, engineering plastics such as various colors ABS, PC, PPSF and medical ABS and so on.
FDM rapid prototyping technology's weaknesses are:
1, relative to the advanced precision molding technology lower SLA, the most high-precision 0.127mm
2, forming the surface finish of SLA as foreign advanced technology;
3, forming relatively slow