As the fastest growing technology in industrial 3D printing - SLM metal 3D printing, has been highly anticipated by the industry. Xitong is concentrating on the research and development of industrial grade products. What kind of characteristics does the WALNUT series products that will be launched in Guangdong are currently available, let us explore its source.
Xitong Walnut 26 metal 3D printer
SLM (Selection Laser Melting) technology is an important part of rapid prototyping. Xitong SLM machine uses fine-focus spot scanning to scan 20-60 micron metal powder, which can obtain any shape, with functional parts that are completely or close to the traditional metallurgical processing texture. The density can reach more than 98%, the post-treatment can reach 100% technical requirements, the dimensional accuracy is 20-50 microns, and the surface roughness is 20-30 microns. It is one of the most advanced additive manufacturing technologies in China and can be applied to the mold. , automotive, medical, aerospace and other fields.
Xitong WALNUT series printers use fiber lasers. Because fiber lasers require almost no maintenance, the beam quality is excellent, and the photoelectric conversion efficiency is high, the advantages of rapid prototyping are obvious. The power ranges from 200W, 400W, 500W.
Laser scanning process and process control
Xitong SLM technology adopts single-melt forming, parts are superimposed by many molding surfaces, and each layer is woven by many single scanning lines. Single-channel scanning lines and various powder materials are superimposed on one molding surface. Density, the key to tensile strength, Xitong designed a specific scanning path and overlay scheme for titanium alloy, aluminum alloy, iron, nickel and other materials, adding a 30-60 degree scan based on the common 90-degree scan. Optimize and integrate a material optimized scanning solution.
Optimized laser scanning solution
Energy input control
In general, high laser energy input is easy to obtain a smooth continuous single channel melting channel, but high laser power density easily vaporizes the material, not only reduces the material quality in the molten pool, but also blows away the powder around the molten pool, resulting in the next When scanning, there is not enough powder to ensure the fullness of the molten pool. Xitong has drawn the SLM forming energy parameter index of each material through nearly 10,000 experiments, setting the molten pool over-melting, incomplete melting and reasonable energy input range. .
Molding scanning strategy
The filling scanning strategy has an important influence on improving the density, molding efficiency and internal residual stress of SLM molded parts. Xitong Company uses different scanning speeds for the outer frame, inner layer and core of the parts, which greatly improves the forming efficiency. The outer frame bottom speed of the part is scanned to achieve high density and high surface quality, while the inner layer and the core are scanned at high speed to improve molding efficiency.
At the same time improve the quality and efficiency of SLM molding
Molding process inspection and feedback
During the printing process, the control and detection of oxygen content directly affects the smoothness of the forming and the safety of the overall equipment. Xitong SLM closely monitors the oxygen content and temperature of the molding cavity, and automatically adjusts the air filtration speed and the embedded operating system. Inert gas filled switch, the oxygen content in the cavity is lower than the material requirements
Support design
Although SLM technology can form metal zeros of any complex shape in principle, it can not perfectly shape all geometric features, including thin plates, sharp corners, especially overhanging structures. Xitong WALNUT SLM uses self-developed support generation software to make the above difficulties Effectively solved.
Products with multiple geometric features can print successfully
The successful launch of Xitong Metal 3D printer marks that Xitong has become the only domestic technology chain manufacturer in the domestic 3D printing field. It can be compared with foreign 3D SYSTEM, STRATASYS. If you want to know more details, please come to Xitong Dongguan on August 28th. "Wind from South China - Xitong series industrial 3D printer conference."
Simultaneous display of metal 3D prints at the Xitong conference
At that time, Xitong will be released for the first time in series products, including Riverbase 400/500/600 industrial light curing printer and Walnut11/18/26 metal 3D printer.
(Editor)
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