| 摘要 |
A process and apparatus for free form fabrication of a three-dimensional work piece comprising (a) feeding raw materia! in a sold state to a first predetermined location; (b) depositing the raw material onto a substrate as a molten poof deposit under a first processing condition; (c) monitoring the molten pool deposit for a preselected condition; (&uacgr;) comparing information about the preselected condition of the monitored molten pooi deposit with a predetermined desired value for the preselected condition of the monitored molten poo! deposit; (e) solidifying the molten poo! deposit; (f) automatically altering the first processing condition to a different processing condition based upon information obtained from the comparing step (d); and repeating steps (a) through (f) at one or more second locations for building up layer by layer a three-dimensional work piece. The apparatus is characterized by a detector that monitors a preselected condition of the deposited material and a closed loop electronic control device for controlling operation of one or more components of the apparatus in response to a detected condition by the detector. |
