Forming Principle Of Rapid Prototyping Machine

SLA process, also known as photomodeling or stereolithography, works based on the photopolymerization principle of liquid photosensitive resin. The liquid material can undergo rapid photopolymerization under the irradiation of ultraviolet light with a certain wavelength and intensity. The molecular weight increases sharply, and the material changes from liquid to solid.

The liquid tank is filled with liquid light curing resin. Under the action of deflection mirror, the laser beam can scan on the liquid surface. The scanning track and the presence of light are controlled by computer. Where the light spot hits, the liquid solidifies. At the beginning of molding, the working platform is at a certain depth below the liquid level, and the focused spot is scanned point by point on the liquid level according to the instructions of the computer, that is, point by point solidification.

When a layer of scanning is completed, the non irradiated area is still liquid resin. Then, the lifting table drives the platform to drop one layer, and the formed layer is covered with a layer of resin. The scraper scrapes the resin liquid level with high viscosity, and then scans the next layer. The newly solidified layer is firmly adhered to the previous layer. This is repeated until the whole part is manufactured to obtain a three-dimensional solid model.