The principle of production in Liaocheng City Hengchun source Machinery Co., Ltd. rapid prototyping laser engraving machine sales is the three-dimensional entity model generated by CAD, the two-dimensional data slicing software layered, each thin section drive control for laser beam shooting, liquid, powder or sheet material processing requirements, thin shape, layer by layer accumulation solid model. Forming the traditional industrial technology mostly follow the material removal method this method, such as turning, milling, drilling, grinding, cutting; others are used for forming mould, such as casting, stamping. While the laser rapid forming is a new forming principle of hierarchical processing, superposition forming. Laser rapid prototyping technology fast to create model or prototype can be used directly for new product design validation, verification, engineering analysis, the market order of the enterprise level decision-making, shorten new product development cycle, reduce development costs, improve the competitiveness of enterprises.
(1) stereolithography (SL-Stereolithography, orSLA)
The ultraviolet laser under computer control according to the predetermined parts layered section contour for the trajectory of the liquid photosensitive resin point by point scanning, resin layer is scanned to produce a section light polymerization and curing to form parts, then apply the scanning and work on a new layer of liquid resin, repeat until the entire prototype manufacturing [3]. The characteristic of this method is of high accuracy, good surface quality, energy, manufacturing complex shape especially fine parts, is the lack of equipment and expensive material, design of support to manufacturing process.
(2) the laminated object manufacturing (LOM-Laminated Object Manufacturing)
LOM technology is based on laser cutting of thin material part contour information obtained, the obtained layer by hot pressing device and below has been cutting layer, and a new layer of paper and then superimposed on top, orderly bond into 3D objects. The main features of LOM is the price of equipment and materials is low, product strength is good, high precision. Helisys company developed a variety of molding material for LOM process, can be molded components made of sheet metal, the company has also developed the LOM technology based on ceramic composite materials.
(3) the selective laser sintering (SLS -Se1ected Laser Sintering)
SLS is using laser selectively stratified sintering solid powder, and the solidified layer overlapping generation sintering and forming the required shape parts. The whole process includes the establishment of CAD model and data processing, powder, sintering and post treatment. The most prominent advantage of SLS lies in molding material that is used very widely. Theoretically speaking, powder materials can be any heating after the formation of interatomic bonding as the molding material. At present, can be successful SLS molding material with paraffin, polymer, metal, ceramic powders and their composite powder. Because SLS molding material varieties, material saving, forming properties are widely distributed, suitable for a variety of applications and no SLS support system design and manufacturing complex, so its application is more and more widely. But SLS uses a metal material and a low melting point material (which may be a low melting point metal or organic adhesive material) mixture, in the process, the low melting point materials molten or partially molten metal materials, but higher melting point and does not melt, but by the low melting point materials molten or partially molten coating bonded together, 3D solid form is similar to powder metallurgy sintering blank, the entity has a certain proportion of pore, cannot reach 100% density, mechanical performance is poor, often also need through high temperature melting or infiltration of metal fill the hole after treatment can be used.
