| 摘要 |
Apparatus and a method for forming a metallic component by additive layer manufacturing are provided. The method includes the steps of mounting a work piece (3) to ALM manufacturing apparatus including measuring means in the form of load cells (13, 14) to measure stresses tending to distort the work piece, using a laser heat source (24) to apply heat to a surface (18) of the work piece (3) sufficient to melt it;adding metallic material to the melted surface (18) and moving the heat source (24) relative to the work piece (3) whereby progressively to form a layer (30) of metallic material on it; repeating the above steps as required, whereby progressively to form the component and, while doing so, measuring stresses tending to distort the component with the load cells (13, 14) and, if they are above a predetermined threshold, stress relieving the work piece with means such as a pulsed laser (27) while still mounted to the apparatus to reduce distortion to a predetermined level, and again repeating above steps as required to complete the component. A computer (16) may be included to control the whole process. |
