Laser coating is a rapidly developing 3D printing technology in recent years. The principle is to melt the material through a high-energy laser beam and then apply it directly to the target surface and fuse with it. In fact, it is metal 3D printing technology. Due to its flexibility and efficiency over traditional processes, this technology is now widely used in many industries. Below, Xiaobian introduces you to its latest case – manufacturing a car gearbox.
The protagonist of this case is the Belgian auto parts supplier VCST. The company is currently developing a new gearbox, and in the process they used laser coating technology from LCV Belgium.
It is understood that in this case, the material used by LCV is a mixed powder of metal and ceramic, and the printed objects are gearbox parts such as gears and pipes. These parts were polished and finished after printing, and then passed the contact wear (1200 MPa) and fatigue (650 MPa) tests. In the subsequent dynamic load test, they also performed well.
One of the biggest advantages of laser coating technology is flexibility—not just the complex architecture that can be done with traditional digital processes based on digital files, but also the ability to print on the surface of objects at almost any angle. Therefore, it is a very powerful helper for product repair.
In addition to being flexible and efficient, the advantages of laser coating technology include:
· Wide range of applications - can be used to manufacture ordinary metal parts, as well as to process oxidizable metal parts such as titanium
· Can make structures that cannot be realized under normal conditions, because the interaction between laser and material is a unique rapid melting and solidification process
At present, the institutions that are studying laser coating technology abroad are mainly the Sandia National Laboratory of the United States and the Los Alamos National Laboratory, the Hannover Laser Center of Germany, and the Institute of Integrated Manufacturing Technology of the National Academy of Sciences of Canada. Among them, Los Alamos Laboratories has successfully used this technology to manufacture parts with hemispheres, straight walls, through holes, sharp corners, etc., and the processing materials include AISI 316 and 400 stainless steel. It has been evaluated that the use of this technology to make the mold can reduce the process from the original 62 steps to only 7 steps, and the time is shortened by nearly 40%.
As for the domestic, the units that study the technology mainly include Tsinghua University, Northwestern Polytechnical University, Beijing University of Technology and the Chinese Academy of Sciences. Among them, the Laser Processing and Manufacturing Center of the Department of Mechanical Engineering of Tsinghua University has developed a coaxial powder feeding nozzle and automatic powder feeder suitable for the direct manufacture of metal parts, and a laser fast flexible manufacturing LRFM system, while the Chinese Academy of Sciences has developed integration. Laser intelligent processing system.
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