evelopment of Blue Diode Laser for Additive Manufacturing

摘要

We developed several blue diode lasers and applied laser metal deposition one of the additive manufacturingtechnologies. This system has two laser modules, a focusing head, a powder feeder and a XYZ stage. Fiber couple directdiode laser module was guided to focusing head by optical fiber, which core diameter is 400 μm. In case pure copperlayer formation with blue diode laser, the laser output power is 80 W, a scanning speed is 10 mm/s. A powder feed ratewas varied from 14 to 80 mg/s. The stage was moved to the X direction. And In case pure copper rod formation withblue diode laser, the laser output power is 80 W and a scanning speed is 4 mm/s. A powder feed rate was varied from 14to 80 mg/s. The stage was moved to the Z direction. Layer thickness was linearly increased to 40ms in all powder feedrate and the layer formation rate was gradually decreased over 40ms. An average slope Δspeed = 4 mm/s at 40 ms isobtained. From this, it is considered that pure copper rod can be formed by pulling upward at 4 mm/s. Based on theresults obtained from copper layer, pure copper was stacked upward (direction Z) to form a pure copper wire. The resultas expected was obtained by raising the speed at 4 mm/s. And since a thin molten pool was formed only in a limited area,it was observed that the molten pool was piled up without melting. It was confirmed that the flying powder adheredwithout melting. And thereafter, it was melted to form a rod. It was confirmed that there were no pore in pure copper rod.