一种新的线扫描快速成型工艺方法(英文)

An Innovative Line Scanning Rapid Prototyping Process

一种新的线扫描选择性激光烧结快速成型 (SLSRP)方法可以提高对大工件的加工质量 .它与一般振镜点扫描完全不同 .它使用柱面透镜组将CO2 激光器输出的圆光束改变为扇形光束 ,从点 ( 0 .1 4mm)到最大线长 ( 40mm)实现无级变长以适应烧结层面的几何形状 .保证不同长度激光线上的功率密度恒定并满足在 3 0mm/s的扫描速度下对各种有机粉末材料进行有效烧结 .应用实践证明这种线扫描工艺的加工质量尤其是对大工件的加工质量优于振镜点扫描的工艺方法 。

In order to ra ise the processing quality of the larger workpieces, an innovative line scanning selective laser sintering rapid prototyping (SLS RP) process is introduced, dif fering entirely from the vibrating mirror spot scan. Changing the output beam of CO 2 laser into a fan beam by cylindrical lenses, the length of the beam proje cting line on the working plane can be varied from the maximum length to a singl e spot by a zooming unit during scanning. The line width 0.14 mm and variable li ne length range 0.14～40 mm can be achieved. Laser power density is identical fo r different line length and is sufficient to sinter the various organic powder ma terials at 30 mm/s scanning speed. The processing quality of the innovative line scan is better than that of the vibrating mirror spot scan for larger workpiece s, so the application region of SLS RP technology may be expanded greatly.