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In the field of 3D printing, China is a latecomer, but in recent years, the technology has progressed rapidly, and it has a tendency to rise to the top. According to the Xinhua News Agency, the 705th Research Institute of China Shipbuilding Heavy Industry has undergone a year of research and development, and the company has made a major breakthrough in the field of 3D printer technology. It has realized 3D printing by means of direct metal laser sintering rapid prototyping technology, becoming 3D printing after the United States and Germany. After the giant, the fourth company in the world to master the technology.
The 705th Research Institute of China Shipbuilding Heavy Industry Co., Ltd. completed the first prototype of Metal Direct Sintering Rapid Prototyping Technology (DMLS) and became the fourth company in the world to master this technology.
Direct Metal Laser-Sintering (DMLS) is the jewel in the crown of 3D printing technology. This technique is based on the direct deposition of high-energy laser-fused metal powder while sintering the solidified powder metal material and automatically layer-by-layer stacking to create solid parts of dense geometry. The metal itself is dense and melted, and it is not easy to produce voids during molding such as powder metallurgy. The density of the structural parts can reach more than 99%, which is close to the forged material body.
By selecting different sintered materials and adjusting process parameters, it is possible to produce parts with widely varying performance, from porous steels to corrosion-resistant stainless steels (purchased from the product library) to densely-formed die steels. The use of DMLS technology can even produce very complex parts directly, eliminating the need for milling and electrical discharge machining, providing a wider degree of freedom in design.
In the early years, only relatively soft materials were used for this technology, and as technology continued to advance, the field of application also extended to various mass production molds such as plastics, metal die casting and stamping.
At present, the technology is mainly used in the world to manufacture high-stressed components and complex components and irregular components that cannot be processed by conventional processes. It can achieve 90% to 95% of the highest strength of the same grade metal, with high precision and minimal molding constraints. The characteristics are widely used in high-end precision parts manufacturing, such as aerospace, automotive, medical personalized parts manufacturing, small injection molds and inserts, etc., in addition to the application of this technology for small batch, personalized complexity The pieces are processed.
For a long time, direct metal laser sintering technology has been dominated by a small number of 3D printing giants in Germany and the United States. According to the observer network, companies that have mastered DMLS technology include American 3D printing giant Stratasys, laser equipment manufacturer Fonon and German 3D printers. Manufacturer EOS, among others, Germany EOS is the pioneer in this field. It began researching 3D printing technology in the 1970s. In 1994, it won the first DMLS technology patent. Now it is the world's largest manufacturer of DMLS systems.
At present, the price of each DMLS printer is more than 10 million yuan. China's 3D printing technology has a huge gap with the world's advanced enterprises in this field.
In order to master the technology as soon as possible, in August 2014, 705 Kunming Branch established the U3 team of the additive manufacturing division, specializing in the research and product development of this technology. Through the introduction of excellent technical teams at home and abroad, we will accelerate the research and development of key technologies in the fields of additive manufacturing such as “mechanical structure, intelligent control, software (purchasing and supply of products), new materialsâ€. After completing the development and finalization of the fused deposition technology (FDM) printer, the focus was on breaking through the metal laser sintering molding technology. After a year of research and development, the prototype of the first direct metal laser sintering technology with independent intellectual property rights was finally completed.
At present, the technical team of the institute has used this key technology to complete the sintering test of 316L stainless steel, titanium alloy and other metal powder parts.
In order to realize the rapid development of 3D printing technology, the next step will build the Additive Manufacturing Industrial Park and the Yunnan Laser Rapid Prototyping Technology Center in the Kunming Branch New District, and configure DMLS mass production equipment, FDM non-metal 3D printer group, and corresponding The 3D scanning modeling equipment creates an additive manufacturing industry base that integrates additive manufacturing technology research, equipment development, production and value-added services.