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240. SLA / LOM basic principles and characteristics

Rapid prototyping technology, also known as solid free forming technology, rapid prototyping technology is based on three-dimensional computer modeling, in the treatment of three-dimensional model, the formation of cross-section contour information and will be followed by three-dimensional model of a variety of materials, information scanning section profile , and the material bonding, curing, sintering, layer by layer stacking into physical prototypes. With SLS, FDM, LOM rapid prototyping process method and other direct manufacturing a resin mold, ceramic mold and metal molds.

1.SLA basic principles: SLA technology is cross-computer products, CAD modeling system for three-dimensional model obtained by computer controlled laser, according to determine the trajectory of the liquid photosensitive resin layer by layer scanning, the scanned area so that layers of curing, fused to form the final three-dimensional solid, and then after the final hardening of the amount of lighting and other post office to form parts or molds. Features: any complex shape can be formed, forming high precision simulation of strong, high utilization of materials, cost performance is higher. Product evaluation for appearance, function test, rapid manufacturing electrodes and a variety of rapid economic mold. However, the equipment used in the technology and the photosensitive resin is expensive, its high cost.

2.LOM basic principles: LOM technology is three-dimensional computer model by using its selective laser slicing, the layers will be bonded layers of cross-section outline of the final stack into three-dimensional solid product. Features: fast prototyping, molding materials, cheap, low cost, because no phase change, hence there is no thermal stress, shrinkage, expansion, warping, etc., so the shape and make-inch accuracy and stability, but after forming the block stripping waste more trouble, especially stripping waste from inside the complex. The process for the aerospace, automotive, etc., and in the production of larger parts.