Manufacturing technology can be roughly divided into three ways. One is the reduction of material manufacturing, which means using tools or electrochemical methods to remove unwanted materials, and the remaining part is the desired product. The second is the manufacture of equal materials, which refers to the use of mold control to change the liquid or solid material into the desired product. These two methods are traditional manufacturing methods, such as casting technology used since the Bronze Age more than 3,000 years ago. The third is the 3D printing technology developed in the past 30 years. The scientific name is additive manufacturing, which is a method of accumulating objects by layer by layer. 1. Technical principle The American Society for Testing and Materials's Additive Manufacturing Technical Committee (ASTMF42) defines additive manufacturing as a production process that integrates materials based on three-dimensional data, as opposed to reduced material manufacturing. According to this authoritative definition, additive manufacturing must be driven by data. 3D printing technology is a collective term for a series of additive manufacturing technologies. The basic principle is that the laminate is manufactured by the rapid prototyping machine to generate the cross-sectional shape of the target object in the X-Y axis coordinate direction, and then intermittently layered in the Z-axis coordinate. The displacement of the thickness eventually forms a three-dimensional piece. For most of human history, we have made new physical objects, such as casting (making in equal materials) or cutting and drilling (reducing material manufacturing), by cutting raw materials or by molding. When most people first heard about 3D printing, they thought of a traditional desktop printer. 3D printing is very similar to traditional printing, which is done by data-driven hardware. Generally speaking, people use traditional inkjet printers for printing. The process is like: “print†button on the computer screen, a digital file is sent to an inkjet printer, and then the printer will The layer of ink is sprayed onto the surface of the paper to form a two-dimensional image. The same is true for 3D printers, where the control software completes a series of digital slices through a slicing engine (used to break the stereo model into multiple cross sections) and then transfers the slice information to a 3D printer, which prints layer by layer. And then stack them up until a solid object is formed. As far as the actual experience of the end user is concerned, it is often impossible to feel the difference between the 3D printing and the traditional printing in the production process. The biggest difference that can be felt is that the "ink" used is a real raw material, precisely because of this. Similarly, additive manufacturing technology is aptly called 3D printing technology. Ordinary printer and 3D printer In fact, there are big differences between the two in terms of printed materials and principles. 3D printing materials can be divided into metal and non-metal categories, including solid, liquid, powder, etc. Each type of material corresponds to one or more printing principles. For device users, the main difference between 3D printing and traditional printing is that a complete 3D model is designed on the computer and then printed. Therefore, 3D printing is far more complicated than traditional printing. The 3D printing process generally includes four steps of data acquisition, data processing, printing and post-processing. The first two steps involve software and optical imaging techniques, and the third involves materials, machinery, and electronics. The first three steps complement each other, and any problem with one link will affect the final result of printing. The post-processing steps are more to improve the appearance and characteristics of printed items using conventional processing methods. Since the printing process involves the widest range of technologies and fields, the focus in the industry is generally on the printing step. Most of the core technologies of 3D printing are also around this step. 2, technical category Since the development of 3D printing technology, dozens of printing technologies have been derived on the basis of the original, and there are different classification methods based on different principles. We list three different classification methods based on different printing principles, differences in consumables and molding principles, and types of printing consumables. The ASTMF42 Additive Manufacturing Technical Committee has divided the printing principles into seven categories in its published Standard Terminology for Additive Manufacturing Technology (ASTMF 2792-12a). 3D printing technology classification (based on printing principle) According to the difference in the shape and molding principle of the consumables used, the current mainstream 3D printing technology can be roughly divided into three types: extrusion melt molding, granular material molding, and photopolymerization molding. Each type evolved into multiple categories depending on the molding technique. Among them, melt lamination (FDM) belongs to extrusion melt molding, and granular material molding includes direct metal laser sintering (DMLS), electron beam melting (EBM), selective laser sintering (SLS), and selective thermal sintering (SHS). Selective laser melt forming (SLM), photopolymerization includes photocuring (SLA), digital light processing (DLP), and polymer jet (PI). As technology advances and market demands continue to increase, new technologies have been derived based on typical 3D printing technologies, such as gypsum 3D printing (PP), layered solid manufacturing (LOM), 3D printing (3DP), and electron beam freeform manufacturing. (EBF), laser net shape manufacturing (LENS), etc. 3D printing technology classification (based on material shape and molding principle) 3D printing technology can be divided into non-metallic 3D printing technology and metal 3D printing technology, depending on the type of printing consumables. Among them, FDM, SLA, DLP, 3DP, etc. belong to non-metal 3D printing technology; SLM, DMLS, EBM, etc. belong to metal material 3D printing technology. Dining Chair,Pp Plastic Chair,Leisure Back Chair,Home Dining Chair vchomy , https://www.jsvichen.com
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