The basic working principle of rapid prototyping technology is discretization and stacking. Firstly, the physical model of the part is transformed into a computer electronic model through CAD modeling or 3D digitizer, and then the CAD model is converted into an STD (stereolithography) file format. The computer 3D solid model is discretized in the z-direction using layered software to form a series of thin sheets with a certain thickness. A laser beam (or other energy flow) controlled by the computer is used to selectively solidify or bond a certain area, Thus forming a layer that constitutes the entity of the part. This gradually accumulates to form a prototype (3D solid). If necessary, some post-processing processes (such as deep solidification and grinding) are carried out to meet the requirements of the functional components. The recent development of rapid prototyping technology mainly includes: three-dimensional light modeling, selective laser sintering, thin layer stacking manufacturing, and melting deposition models.
Due to the fact that rapid prototyping (including laser rapid prototyping technology) only adds materials where they are needed, from design to manufacturing automation, from knowledge acquisition to computer processing, from planning to interfaces, and so on. It is very suitable for CIM, CAD, and CAM, and compared to traditional manufacturing methods, it shows many advantages.
Quickness refers to the ability to manufacture prototypes with the design of a three-dimensional surface or volume model of a product. From CAD design to prototype manufacturing. It only takes a few hours to a dozen hours. Compared to other methods, it is much faster.
Suitable for forming complex parts
When using laser rapid prototyping technology to manufacture parts, no matter how complex the parts are, they are decomposed into binary data by the computer for molding, without distinction between simple and complex. Therefore, it is particularly suitable for forming parts with complex shapes that are difficult or even impossible to manufacture using traditional methods.
Without the need for traditional machining tools and various equipment, parts can be formed into prototypes and parts with certain functions on one device. If you want to modify a part, you only need to modify the CAD model, which is particularly suitable for single piece and small batch production.
After laser rapid prototyping technology converts CAD data into STL (Rapid Prototyping Technology Standard Interface) format, the rapid prototyping manufacturing process can begin. The conversion of CAD to STL files is automatically completed in CAD software. The rapid prototyping process is a two-dimensional operation that can achieve high automation and programmability, that is, using simple and repetitive two-dimensional operations to shape complex three-dimensional parts without the need for special tools or human intervention.