2ステップレーザ照射法による純鉄粉体材料を用いた3次元造形

概要

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A rapid prototyping is reported on direct fabrication from powder material using a laser. This process is based on laminated object manufacturing (LOM) composing of three stages : supplying of powder, shaping of a laminate and superposing of laminates. For the solidification of powder a high power laser beam is irradiated. Such a problem, however, is caused that most of the molten material splashes away at the moment of laser beam irradiation, . To solve this problem, the supplied powder is compressed prior to laser projection, and a laser is irradiated with two steps. First, the compressed powder is solidified to the lamina with low output power and then, the lamina is combined with the solid with higher output power. In the case of pure iron powder, for instance, the powder is compressed to be 60%. in volume by the pressure of 117MPa, and a concave laminate with the thickness of 0.5 mm and a large curvature is formed when the beam is projected onto the compressed surface from a laser with 5.4J output power. The lamina is combined with the solid without much splashing if the beam is projected once again on the surface (12J). The solid object thus fabricated has tensile strength exceeding 300MPa and various shapes of laminated objects can be realized.
公益社団法人精密工学会の論文
1999-08-05