| 摘要 |
<p>An apparatus for forming three-dimensional objects includes a crucible (1) for holding a molten material; a conically-shaped orifice (1a) having a fixed outlet diameter (do) at the bottom of the crucible through which a jet (50) of the molten material flows towards the substrate; and an oscillating mechanical member (5) for breaking the flow of molten material into the molten material drops (60). The oscillating mechanical member further includes a conically-shaped head (5a) for cooperating with the orifice (1a) and for varying the effective size of the orifice. The conically-shaped head includes a slanted radial portion (5c) and a tip portion (5b) extending through the orifice. The effective diameter (deff) of the jet is defined by the relationship deff=[d02-(d0-δtanυ)2]1/2, wherein δ represents the amount of the tip portion extending through the orifice, and υ represents a slant angle corresponding to the slanted radial portion of the conically-shaped head.</p> |
