【正文】 g cycle, debugs the mold to be convenient, reduces the replacement mold time, enhances the production efficiency. fast trades the mold technology Because product variety increasing, causes the mold in the production the transmutation extremely frequently, how thereupon reduces the ramming equipment the down time, enhances the production efficiency, fast traded the mold technology to receive people39。s later period develops. US, Japan, England, Israel, Germany, China have all promoted own mercialization product, and has formed the new industry gradually. RPM is the puter, the laser, the optical scanning, the advanced new material, the puteraided design (CAD), the puter assistance processing (CAM), the numerical control (CNC) synthesizes the application the high technology and new technology. In takes shape in the concept take the plane separate, piles up as the instruction, in the control take the puter and the numerical control as the foundation, take biggest flexibility as general goals. It has abandoned the traditional machinefinishing method, to the manufacturing industry transformation is a significant breakthrough, uses the RPM technology to be possible directly or indirectly the fast pattern making, this technology already by profession widespread application and so on automobile, aviation, electrical appliances, ships, medical service, mold. Under summarized already mercialization 2 several kind of models fast to take shape at present the craft. lasers threedimensional photoetching technology (SLA) The SLA technology hands over the puter CAD modelling system to obtain the product the threedimensional model, through the microputer control laser, according to the determination path, is carrying on to the liquid state photosensitive resin by the level scanning, causes layer upon layer to solidify by the scanned sector, is united as one body, forms the final three dimensional entity, after again passes through the related finally hardening to polish and so on place the quantity, forms the workpiece or the mold. The laser threedimensional photoetching technology main characteristic is may take shape wilfully the plex shape, takes shape the precision high, simulation strong, material use factor high, performance reliable, the performance price quite is high. Suits the product outlook to appraise, the function experiment, fast makes the electrode and each kind of fast economical mold. But this technology uses equipment and photosensitive resin price expensive, causes its cost to be high. pack of levels outlines manufacture technology (LOM) The LOM technology is through the puter threedimensional model, the use laser selectively to its lamination slice, will obtain each section outline layer upon layer will cake, finally will fold the addition three dimensional entity product. Its craft characteristic is takes shape the speed quickly, takes shape the material small advantage, the cost lowly, because does not have changes, therefore does not have the thermal load, the contraction, the inflation, the warp and so on, therefore the shape is stable with an inch precision, after but takes shape the waste material block to strip takes time, specially the duplicate miscellaneous items interior waste material strips. This craft is suitable for the aviation, the automobile and so on and center the volume big workpiece manufacture. lasers powder electoral district agglutinates takes shape the technology (SLS) The SLS technology is the puter threedimensional model through the lamination software its lamination, under the puter control, causes the laser beam basis lamination the slice section information to the powder by the level scanning, scans to the powder agglutinates the solidification (polymerization, agglutinates, caking, chemical reaction and so on), layer upon layer superimposes, piles up the three dimensional entity workpiece. This technical most major characteristic is can at the same time use several kind of different materials (the polycarbonate, the polyethylene chloride, the paraffin wax, the nylon, ABS, The casting granulated substance) makes ponents. fuses the deposition to take shape the technology (FDM) The FDM technology is may squeeze out by the puter control fuses the condition material the spray nozzle, determines the geometry information according to the CAD product model lamination software, squeezes out half flow regime the heat to model the material deposition to solidify the precise actual workpiece thin layer, from bottow to top layer upon layer piles up a three dimensional entity, may make the mold or the prod uct directly. three dimensional printing take shape the technology (3DP) The 3DP technology controls with the microputer to spurt the ink printing head 3 continuously, the basis lamination software selectively deposits the liquid cementing material by the level on the powder level, finally piles up a three dimensional entity by the smooth printing twodimensionalleve Justs like does not use the laser the fast pattern making technology. This technical main application takes shape in advance in the cermet pound materials porous ceramics on, its goal is produces the mold or ??? the manufacture directly by the CAD product model. surfaces take shape the pattern making technology The surface takes shape the pattern making technology, mainly is the use spurts spreads, the electrolytic casting, chemistry corrosion and so on the new technique formation cavity surface and the fine pattern one kind of craft technology, in the practical application including following several kind of types. electric arcs spurt spread take shape the pattern making technology The electric arc spurts spreads takes shape th