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233. Several common comparison of rapid prototyping technology 3

Selective sintering powder material (Selected Laser Sintering) is a rapid prototyping process, called SLS. Powder materials using carbon dioxide laser selective sintering of powder materials (plastic powder mixed with binder powder) selective sintering is a layer stack by the integration of discrete points of a rapid prototyping method for three-dimensional entity.

Powder materials using carbon dioxide laser selective sintering of powder materials (plastic powder, ceramic powder mixed with binder and metal powder mixed with binder) selective sintering is a layer of discrete points on the integration of a three-dimensional entities, the process method.

At the beginning of processing before the first studio filled with nitrogen gas to heat up, and maintained at about the melting point of powder. Molding, to send the barrel rise, powder rollers move, the first working platform in the upper layer of powder material, and then the laser beam under computer control in accordance with section profile of the solid part of which the powder sintering the powder to melt and then form a solid profile. After sintering the first layer, table drop height of a section of floor, covered with a layer of the powder, the next layer of sintering, and so on, forming three-dimensional prototype parts. Finally, after 5-10 hours of cooling, you can remove parts from the powder cylinder. Capable of supporting without sintering the powder is sintered parts, when the sintering process is completed, remove the parts. Selective sintering powder materials suitable for forming small pieces, can direct to the plastic, ceramic or metal parts, parts warpage selective than the liquid photosensitive resin curing process to be small. However, this process still need to scan the entire cross-section and sintering, with heating and cooling needs studios, forming a long time. In addition, due to powder particle size and laser point restrictions were part of the surface is porous. In sintered ceramics, metal and binder mix powder and get a prototype part, the furnace shall be placed in it, burned one of the binder and filler into the pores, followed by processing complex.
Selective sintering powder materials suitable for rapid prototyping process of product design performance and production of visual function test parts. Because it can be a variety of different components of the metal powder sintering, the post-processing copper infiltration, so its products can be made of metal parts with mechanical properties similar to, but because of rough surface forming, seepage copper complex process, So be further improved.

SLS rapid prototyping technology advantages are:
1, compared with other techniques, can produce a hard mold.
2, available in several materials, including class engineering plastics, wax, metal, ceramics and so on.
3, part of the construction time is shorter, up to 1in / h height.
4, no design and construction support.
SLS rapid prototyping technology weaknesses are:
1, a laser loss, and require specialized laboratory environment, the use and maintenance expenses.
2, the need for preheating and cooling, post-processing problems;
3, the molding surface rough and porous, and powder particle size and by the limited laser spot.
4, the need to keep the processing chamber with nitrogen to ensure the safety of the sintering process, the processing costs.
5, the molding process produces toxic gases and dust, pollution of the environment.