激光三维内割快速原型制造技术的研究

Based on a combination of the techniques of Laser, Numerical control,.Macro-molecular material and Computer graphics, a novel RP method has been.realized: a laser beam is focused inside a block of transparent stock material; at the focal point the intensity of the laser energy is high enough to “burn” the material; the.focal point is guided inside the stock material to follow the surface contour of a desired part by a numerically controlled device; a continuous collection of these “burned” points forms the desired separating surface and a part with complex geometry is thus formed. This method improves upon existing RP technologies in that.it works on the inside of the stock material instead of the 2-D surface, the laser focal point only needs to scan the surface of the desired shape instead of scan of the entire 3-D region inside the desired part, and it represents a major step away from all.traditional RP methods where particles of material is accumulated to form layers and multiple layers are accumulated to form 3-D objects. Traditional RP methods’ certain.inherent limitations in efficiency and accuracy may be overcome by this new.approach.A 3-D laser inner cutting laboratory has been established. Through extensive experiments, certain types of macro-molecular polymer have been identified to be suitable for laser inner cutting. A number of parts have been produced, including gear.mating shaft with spline, gear box with shaft, gears, key, and wall structure holding them together, various geometrical shapes with positive and negative molds, and artistic statues. Samples were measured by Hubei Provincial Institute of Metrological.and Testing Technologies. Results are: Linear Tolerance: 0.05~0.17mm; Circular.Tolerance: 0.08mm; Perpendicular Tolerance: 0.22-0.30mm; Parallel Tolerance:0.22-0.34mm.The 3-D laser inner cutting technology has stood up to extensive prior art search 国家自然科学基金资助项目结题报告4and been proved novel. Provincial Technology Appraisal states: This technology.(Laser 3-D Inner Cutting) has no precedent either inside China or out; this world-class technology demonstrates clear potentials for industrial applications and marketability.CCTV (China Central TV) education channel did a half hour special report, which was aired on Jan 20, 2003.Patents: Chinese Patent “RAPID PROTOTYPING METHOD”, Inventor: Hanmin Shi,Patent Number: ZL 00114372.7, Issue Date: Aug 7, 2002;... United States Patent “RAPID PROTOTYPING METHOD USING 3-D LASER INNER CUTTING”, Inventor: Hanmin Shi, Patent Number: 6495794, Issue Date: Dec 17, 2002.

研究一种新颖的激光三维内割快速原型方法：将激光聚焦于透明材料内部；焦点处激光强度足以使材料局部破坏；以数控技术控制激光焦点在材料内部沿零件造型表面扫描和切割，使零件原型与其余材料分离。此法效率高、成形精度好而成本较低。将寻求激光与坯料的合适组合以及激光、数控参数的最佳匹配，探讨此法在普通零件及微型零件原型制造中的应用。