RP rapid prototyping technology in international CNC model production

5 standard categories of RP rapid prototyping technology in international CNC model making

Rapid Prototyping (RP) It is an innovative technology that can directly produce complex parts in a few hours using 3D CAD designed graphics. Specifically, it is divided into Laser Rapid Prototyping (SLA prototype)Rapid Forming of laminated method (LOM)Rapid prototyping of powder sintering (SLS prototype)Rapid prototyping by melting deposition method (FDM)And 3D printing technology. Since the emergence of the rapid prototyping system in 1988, more than 20 systems have been developed, each with some minor differences. At first, these systems were applied in the automotive and aviation fields, and later in many other fields, such as toys, computers, jewelry and medicine, were applied.

stereo curing (SLA) : SLA method is a commercial RP technology with high market share. It uses photo-sensitive resin as raw material, and the computer controls the UV laser to scan the photosensitive resin surface point by point according to the information of each layered section of the part, make the thin layer of resin in the scanned area produce a light polymerization reaction and solidify, forming a thin layer of the part. After one layer is cured, the Workbench moves down a layer thickness distance so that a new liquid resin can be applied on the surface of the originally cured resin, and then the next layer can be scanned and processed. The newly cured layer is firmly glued to the previous layer, so repeated until the entire prototype is manufactured.

melting deposition method (FDM): FDM was invented in 1988. The molten material ejected from the nozzle is X- Driven by the Y workbench, the bottom plate is paved according to the shape of the section, and the parts are processed one layer by one layer. The commercial FDM equipment uses a wide range of materials such as cast paraffin wax, Nylon, Thermoplastic, ABS, etc. In addition, multiple nozzles can be used to improve efficiency.

laser selective sintering method (SLS) The SLS method uses infrared laser as energy source. Most of the plastic materials used are powder materials. When processing, first preheat the powder to a temperature slightly lower than its melting point, and then pave the powder under the action of scraping the stick; The laser beam is selectively sintering according to the layered cross-section information under computer control, and the next layer is sintering after one layer is completed, and the excess powder is removed after all sintering, then a good part can be obtained. At present, the mature process materials are wax powder and plastic powder, and the process of sintering with metal powder or ceramic powder is still under study.

stack method (LOM): The LOM law appeared in 1985. First lay a layer of foil on the substrate (Such as paper) Then use a certain power of infrared laser to cut out the contour according to the layered information under the control of the computer, and cut the non-part into pieces according to a certain grid shape for removal. After processing the layer, then lay a layer of foil and roll it with a hot roller to make the new layer stick to the formed body under the action of the adhesive, and then cut the shape of the layer, so repeatedly until the processing is completed. After removing the chopped excess, you can get the complete part.

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