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Sla Rapid Prototyping Principle
Jul 06, 2017

Sla rapid prototyping processes, also known as light modeling or stereolithography, are based on the principle of photopolymerization of liquid photosensitive resins. This kind of liquid material in a certain wavelength and intensity of ultraviolet light can quickly occur photopolymerization, molecular weight increases dramatically, the material from the liquid into a solid state. Liquid tank filled with liquid light curing resin, the laser beam under the action of the deflection mirror, the liquid surface can scan, scan the trajectory and the presence of light are computer control, spot hit the place, the liquid to solidify. At the beginning of the molding, the working platform is at a defined depth under the liquid surface, and the focused spot is scanned at the liquid level by the computer's instructions, that is, point by point. When a layer of scanning is completed, not the place where the radiation is still liquid resin. And then lift the platform to drive the platform down a layer of height, has been formed on the level of a layer of resin covered, scraper will be larger viscosity of the resin surface scratched, and then the next layer of scanning, the new solid layer of solid To stick on the previous layer, so repeat until the entire part is finished, get a three-dimensional solid model. SLA method is the most rapid research in the field of technology research methods, but also the most technically mature method. Sla rapid prototyping process forming parts of high precision, processing accuracy can generally reach 0.1mm, raw material utilization rate of nearly 100%.

Sla Rapid Prototyping Technology Features - Rapid prototyping technology has several important features: 1) can create any complex three-dimensional geometric entities. Due to the principle of discrete / stacking molding, it simplifies the process of simplifying the process into two-dimensional process, which can realize the processing of any complex shape parts. The more complex parts can show the superiority of RP technology. In addition, RP technology is particularly suitable for complex cavities, complex surface and other traditional methods difficult to manufacture or even impossible to manufacture parts. 2) fast. The design and processing of a new part can be obtained by modifying or reorganizing a CAD model. From a few hours to dozens of hours can be manufactured parts, with rapid manufacturing of outstanding features. 3) highly flexible. Without any special fixture or tool to complete the complex manufacturing process, rapid manufacturing model, prototype or parts. 4) Rapid prototyping technology has achieved two advanced goals pursued by mechanical engineering disciplines over the years, namely, material extraction (gas, liquid, solid phase) process and manufacturing process integration and design (CAD) and manufacturing (CAM) integration. 5) and reverse engineering (ReverseEngineering), CAD technology, network technology, virtual reality, etc., a rapid development of products as a powerful tool.

Sla rapid prototyping process is as follows: 1) the product of the three-dimensional model of the building. Since the RP system is driven directly by the 3D CAD model, it is necessary to construct the 3D CAD model of the workpiece. The 3D CAD model can be built directly using computer-aided design software (eg Pro / E, I-DEAS, SolidWorks, UG, etc.), or a two-dimensional pattern of an existing product can be converted to form a three-dimensional model or a product entity Laser scanning, CT tomography, get point cloud data, and then use the reverse engineering method to construct the three-dimensional model. 2) Sla Rapid Prototyping Sla rapid prototyping process also known as light modeling or three-dimensional lithography, is based on liquid photosensitive resin photopolymerization principle work. This kind of liquid material in a certain wavelength and intensity of ultraviolet light can quickly occur photopolymerization, molecular weight increases dramatically, the material from the liquid into a solid state. Liquid tank filled with liquid light curing resin, the laser beam under the action of the deflection mirror, the liquid surface can scan, scan the trajectory and the presence of light are computer control, spot hit the place, the liquid to solidify. At the beginning of the molding, the working platform is at a defined depth under the liquid surface, and the focused spot is scanned at the liquid level by the computer's instructions, that is, point by point. When a layer of scanning is completed, not the place where the radiation is still liquid resin. And then lift the platform to drive the platform down a layer of height, has been formed on the level of a layer of resin covered, scraper will be larger viscosity of the resin surface scratched, and then the next layer of scanning, the new solid layer of solid To stick on the previous layer, so repeat until the entire part is finished, get a three-dimensional solid model. 3) Post-processing of molded parts. Remove the molding from the molding system, grinding, polishing, Tu hanging, or placed in the high-temperature furnace after the sintering, into a higher strength.