| 摘要 |
A method is provided for material-spray coating an engine component 1 having a plurality of support portions 9-1, 9-2, 9-3, 9-4, 9-5, each support portion having an aperture therein, the support portions being arranged in a segregated manner along a central axis X so that the respective apertures of each support portion cooperate with one another to form a bore (5, figure 1) along the central axis, the support portions being provided for rotatably supporting another engine component. The method comprises: locating a blocking device (37, figures 3 and 4) between adjacent support portions so that a through-hole of the blocking device cooperates with the respective apertures of the adjacent support portions and so that an inner surface is provided by the adjacent support portions and the blocking device; and moving a material-spray device 49 substantially along the central axis and through the bore so as to allow at least a portion of the inner surface to be coated with material-spray. The blocking device (37, figures 3 and 4) may be flexible so that it is deformed before inserting between adjacent support portions. The engine component 1 is preferably a cylinder block, with the plurality of support portions 9-1, 9-2, 9-3, 9-4, 9-5 comprising bearing portions in which a crankshaft or camshaft is located. Preferably molten metal is sprayed onto the bearing surfaces. |
