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US 4,157,887 AGranted
Pressing die for producing ceramic moulds from a pulverulent mass
AssigneeGebruder Netzsch, Maschinenfabrik
InventorGunther Sothje
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AssigneeGebruder Netzsch, Maschinenfabrik
InventorGunther Sothje
Estimating the term…
A press tool for production of moulded ceramic articles from powder material includes a lower tool part adapted to be supported on a press table and carrying a lower die. A matrix shell encircles the lower die and is mounted to move up and down relatively to it. An upper tool part is adapted to be connected to the plunger of the press and carries an upper die which on lowering of the plunger of the press projects into the matrix shell. To fill the powder material into the cavity defined by the lower die and the matrix shell, an annular hopper in the form of an funnel encircles the upper die and is mounted to slide axially thereon. The hopper has an annular outlet facing radially inwards and opening into the cavity when the hopper is in its lower position with respect to the upper die but closed by the upper die when the hopper is in a raised position relatively to the upper die.
A press tool for production of moulded ceramic articles such as plates, from powder material, including a lower tool part adapted to be supported on a press table and carrying a lower die, a matrix shell encircling the lower die and mounted to move up and down relatively to it, and a press plunger with an upper tool part connected thereon and carrying an upper die which on lowering of the plunger projects into the matrix shell, and, to fill the powder material into a cavity defined by the lower die and the matrix shell, an annular hopper in the form of a funnel encircling and mounted to slide axially on the upper die, the hopper having an annular outlet facing radially inwards and opening into the cavity when the hopper is in its lower position with respect to the upper die but closed by the upper die when the hopper is in a raised position relatively to the upper die.
A press tool as claimed in any one of the preceding claims in which the annular hopper together with the lower die, matrix shell and upper die can be tilted about a tilting axis extending transversely to the axis of the mould.
A press tool as claimed in any one of the preceeding claims in which a membrane, clamped at its outer edge, closes a chamber for a pressurizing agent in the lower die, the greater part of the area of the membrane, in the state for filling, being held against the lower die but being able to be pressed upwards by means of a pressurizing agent which is fed into the chamber for the pressurizing agent to further compress the powdery material.
Dependencies are inferred from the claim text.