| 摘要 |
<p>In a device for casting lead grids for electric battery plates, a highly porous ceramic mold lining, preferably of zirconium oxide, is prepared by flame-spraying. Such a lining can include a thin surface coating on a profiled, basic metallic mold or a separately prepared insert plate which is retained to a metallic mold holder. The ceramic surface coating may be accurately formed in place, or may be formed as an over-spray which is then reduced in thickness. Formation of the surface coating may be accomplished by placing masks on the basic metallic mold during the flamespraying, for those areas of the grid which tend to accumulate material, or by adjusting an initially coarse profile of the ceramic layer to the exact profile of the casting by a materialremoving treatment. Alternatively, the insert plate may be manufactured on a matrix with a surface contour which corresponds to the half-profile of the lead grid, as a positive mold to which the ceramic material is applied by flame-spraying after an intermediate coating with a removable adhesive layer. The resulting ceramic coating is then subjected to surface grinding, and is removed from the matrix.</p> |
