1, Technical Principles
Stereolithography (SLA)
Stereolithography technology is one of the earliest 3D printing technologies, which uses a laser beam to scan layer by layer on the surface of liquid photosensitive resin, causing the resin in the scanned area to undergo curing reaction. After each layer is cured, the printing platform will descend a certain distance, then apply a new layer of liquid resin and continue scanning the next layer. This accumulates layer by layer, ultimately forming a three-dimensional solid.
Selective Laser Sintering (SLS)
Selective laser sintering technology uses a laser beam to selectively sinter powdered materials. During the printing process, the laser beam scans the surface of the powder layer according to the preset 3D model data, causing the powder in the scanned area to reach a molten state and bond with each other. Unlike SLA, SLS does not require a support structure during the printing process, as unsintered powder can naturally form support.
2, Material characteristics
SLA materials
SLA technology mainly uses photosensitive resins as printing materials. This material has good forming accuracy and surface quality, and can print detailed models. In addition, photosensitive resins also have a certain degree of toughness and strength, making them suitable for making components that need to withstand certain forces. However, photosensitive resins have poor high-temperature resistance and are prone to deformation or damage at high temperatures.
SLS material
SLS technology mainly uses nylon powder as the printing material. Nylon powder has good high-temperature resistance and mechanical strength, which can print models with sturdy and durable structures. In addition, nylon powder also has a certain degree of elasticity and toughness, making it suitable for making components that need to withstand impact or vibration. However, the surface quality of SLS printed models is relatively poor and post-processing is needed to improve surface smoothness.
3, Application field
SLA application areas
Due to its high forming accuracy and surface quality, SLA technology is widely used in product design, jewelry manufacturing, medical devices, and other fields. For example, in the field of medical devices, SLA technology can print high-precision tooth models, prosthetics and other components; In the field of product design, SLA technology can print detailed product prototypes for designers to review and modify.
SLS application areas
SLS technology has been widely used in aerospace, automotive manufacturing, electronic equipment and other fields due to its excellent high-temperature resistance and mechanical strength. For example, in the aerospace field, SLS technology can print engine components that are resistant to high temperatures and wear; In the field of automotive manufacturing, SLS technology can print automotive components with complex structures and high performance requirements; In the field of electronic devices, SLS technology can print precise components such as circuit boards and connectors.
