Method and device for fabricating moulds from granular material
OwnerJean-Jacques Mazeraninventor
Life of this patent
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Abstract
A method and device for making moulds shaped on two faces by means of model plates (10,11). After depression of the plates, the envelope (17) sealed at (40) containing the granular material (30) is, in its turn, subjected to depression through the tubes (23) and (24) of the armature. The plates are then removed while the internal depression is maintained. The moulds are juxtaposed, and two adjacents moulds will form a print and their free faces will enable the making of two more with two additional moulds. Thus, (n-1) prints will be obtained for n moulds.
Claims14
A device for making a foundry mould comprising:
- a support having first and second side, model plates and a bottom, sealing plate;
- an armature defining first and second longitudinal end walls of said support, so that said support and said armature together define a mould cavity;
- at least one polymer envelope element disposed within said mould cavity;
- means for feeding a granular material for forming a foundry mould into said mould cavity;
- and
- means for generating a vacuum within said mould cavity.
A method of making a foundry mould comprising:
- provided a support including first and second side, model plates and a bottom, sealing plate;
- installing on said side and bottom plates at least one polymer envelope by thermoforming by suction through said plates;
- providing an armature including first and second end plates;
- mounting said side and bottom plates in surrounding relation to said end plates of said armature so as to define a mould cavity having side walls, end walls and a bottom wall, said polymer envelope being clamped between the end plates of the armature and the side and bottom plate;
- filling the mould cavity with granular material for forming said foundry mould, compacting said granular material and leveling the same;
- sealing said mould cavity;
- placing the volume contained in the polymer envelope within the mould cavity under vacuum;
- and
- removing said plates.
Dependencies are inferred from the claim text.