Investigation On System For Laser Micro Fabrication With Metal Powder

One of trends of scientific and technological development is microminiaturization, from millimeter to micron and even nanometre. Technology of micron or nanometre enables mankind to enter a new phase of understanding and remaking nature and to realize another substantial improvement in terms of the volume of information processed in given cubic unit and the ability of motion control.Technology of laser Micro-Manufacturing with micron/nano powder integrates the technology of Rapid Prototyping with Selective Laser Sintering with the sciences of nanometre, laser and computer control. Based on the theory of Laminated Object Manufacturing, the technology can directly produce three-dimension miniature structure by melting nano-phased powder with fine focus.In the process of micromachines, an important technological quota is the distinguishability.In the microscopic process of rapid fabrication, the distinguishability including the scanning distinguishability and the fabrication distinguishability. The fabrication distinguishability is the min-fabrication unit, is also named as the light solidification; the scanning distinguishability is the scanning shifting mechanism's min shifting distance.If thinking over the process of fabriction, the light solidification unit is the volume of the single laser pulse solids the metal powder, or the unit volume of the solidification trance that gained by the single track laser solidfying the mental powder. So, in the process of laser powder rapid micro-fabrication, to gain the fine light solidification unit, mainly should adopt two following aspects:1. Using the laser that has the mini-focus spot. Usually select the doubling frequency laser or fiber laser.