At present, metal 3D printing equipment at home and abroad mainly uses infrared fiber lasers with a wavelength of 1064 nanometers, while the TRUMPF TruPrint 1000 green version uses a green laser with a wavelength of 515 nanometers, TruDisk 1020.
Due to the very high thermal conductivity and reflectivity of copper, this makes it difficult for copper metal to be shaped effectively by conventional 3D printing. The absorption rate of copper for near-infrared light at room temperature is only 5%, which means that the processing window is very high. It is difficult to find the perfect parameters, and the processing efficiency is very slow. The mechanical properties and electrical conductivity of the parts are greatly restricted. In addition, 95% of the energy reflection is also very harmful to the device itself. Copper has a high absorption rate of green lasers, close to 40%, which is 8 times that of near-infrared lasers. A good absorption rate means relatively wide processing. The window, mechanical properties and electrical conductivity of the part are greatly improved, and the reduction of reflectivity can make the processing process more stable and efficient.
TRUMPF's TruPrint 1000 green version uses high-conductivity pure copper ETP (EN CW004A) with a specified copper content greater than 99.9%, which can achieve 100% IACS conductivity and a porosity far below 0.5%. Compared with infrared laser 3D printing equipment, using TruPrint 1000 green version can manufacture copper alloy parts such as CuCr1Zr, such as CuCr1Zr, with a larger process window and higher productivity.