SLA technology works on the principle of photopolymerization of liquid photosensitive resins. The liquid material can rapidly undergo photopolymerization under the irradiation of ultraviolet light of a certain wavelength and intensity, and the molecular weight sharply increases, and the material changes from a liquid state to a solid state.
The laser beam filled with liquid photocuring resin in the liquid tank can be scanned on the liquid surface under the action of the deflection mirror. The scanning track and the presence or absence of light are controlled by the computer, and the liquid is solidified when the light spot is hit.
At the beginning of the forming, the working platform is at a certain depth below the liquid level. The focused spot is scanned point by point on the liquid surface according to the instructions of the computer, that is, it is solidified point by point. When a layer of scanning is completed, the unirradiated area is still a liquid resin. Then the lifting platform drives the platform down to a height, and the formed layer is covered with a layer of resin, which scrapes the liquid surface of the resin with higher viscosity. Then proceed to the next layer of scanning, the new layer of the layer is firmly adhered to the previous layer, and so on until the entire part is manufactured, and a three-dimensional solid model is obtained.