Process for manufacturing device for casting lead grids for elec

Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion

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295272, 156153, 156155, 164 17, 164 35, 164 46, 249 60, 264 39, 264 80, 264118, 264121, 264125, 264162, 264163, 264221, 264296, 264317, 264337, 264338, B06B 300, B28B 736, B28B 1100, B29C 3338

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051086689

ABSTRACT:
In connection with 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 molder. The ceramic surface coating may be accurately formed in place, or may be formed as an over-spray which is then reduced in thickess. Formation of the surface coating may be accomplished by placing masks on the basic metallic mold during the flame spraying, 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 material-removing 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.

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