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Hutschenreuther Ag

Eugen Buhler and Hutschenreuther Ag

Hutschenreuther Ag & Eugen Buhler

Eugen Buhler

Klaus Strobel

Karl Schwarzmeier

Karl Schwarzmeir

Apparatus for producing press-molded articles having a plurality of cavities therein includes a mold cavity which can be filled with a particulate molding compound, which mold cavity contains rods sheathed with expandable tubes which can be expanded by means of a fluid under pressure conveyed into the space between the rods and the tubes: this causes compaction of the molding compound to form the pressed article, which can be removed from the mold after reduction of the fluid pressure to allow detumescence of the expandable tubes and withdrawal of these from the mold cavity so that the mold cavity can be opened to remove the shaped pressed article.

Apparatus for producing pressings provided with channels from powdery

A method for producing press-molded articles having a plurality of cavities therein includes a mold cavity which can be filled with a particulate molding compound, which mold cavity contains rods sheathed with expandable tubes which can be expanded by means of a fluid under pressure conveyed into the space between the rods and the tubes: this causes compaction of the molding compound to form the pressed article, which can be removed from the mold after reduction of the fluid pressure to allow detumescence of the expandable tubes and withdrawal of these from the mold cavity so that the mold cavity can be opened to remove the shaped pressed article.

Process for producing press molded articles provided with channels from

A process and apparatus for producing a dry-pressed molding from a particulate or granular molding material such as a ceramic molding composition in which the composition is initially drawn into a loading cavity by applying a vacuum thereto. The loading cavity is formed by a first mold half and a shooting head having a molding surface the shape of which determines the shape of a premolding which is formed upon entry of the composition into the loading cavity and sufficiently compressed to retain its shape after the shooting head has been removed to allow a second mold half to be positioned over the first mold half. The shape of the part of the premolding formed by the shooting head molding surface differs from that of the second mold half in such a way that, on final pressing, the compression starts in the areas of relatively greater thickness of the premolding before it starts in the areas of relatively smaller thickness so that the compression ratio is maintained approximately constant over the whole of the area of the molding.

Process and apparatus for producing a dry-pressed moulding from a

A method and apparatus for producing flaskless foundry molds made up of copes and drags of wet casting foundry sand, which is blasted into a cavity to form the mold with the use of vacuum. The sand is pressed mechanically while aspirating air therefrom. The gap coming into existence between the pressing plate and the back side of a mold during pneumatic impact compaction is filled with sand before pressing so that a flat back side is produced on the mold so that when casting takes place later there is not danger of the bottom of the mold fracturing or of deformation taking place.

Method and apparatus for the production of flaskless foundry molds

A device for producing ceramic mouldings is disclosed comprising an isostatic press-mould half having an isostatic pressure membrane and an injection head having an inlet opening for introducing granulate and an extraction orifice for sucking the granulate in or out of the mould cavity. The injection head is spring-mounted on a press crosspiece which supports it, so that, as the injection head moves towards the isostatic press-mould half, a sealing pressure slowly forms between the injection head and the isostatic press-mould half and as the injection head moves away from the isostatic press-mould half this sealing pressure is slowly reduced.

Device for producing ceramic mouldings with spring mounted injection head

A process of and a molding press for producing flat moldings comprising a plurality of press molds arranged in series with each other, with each press mold having relatively movable mold parts. In the process effecting relative movement of the mold parts of each of the press molds to an open position and introducing particulate molding material into the mold cavities so formed, and then simultaneously effecting relative movement of the mold parts of each press mold to a closed position in which the molding material in each mold cavity is pressed to form a flat molding. Subsequently, effecting relative movement of the mold parts of each press mold to a position in which the flat moldings are removed from the mold cavities.

Process and molding press for producing flat moldings

The invention concerns an isostatic press mold for producing moldings from powdery ceramic material. The mold comprises two mold parts which are movable relative to one another between a mold-closed position and a mold-open position and which, in the mold-closed position, define between them a mold cavity. On at least one of the mold parts, there is a press diaphragm which on one side defines part of the limiting surface of the mold cavity and on the other side is subjected to a pressure fluid. On its said other side, that is to say on its side facing away from the mold cavity, the press diaphragm is designed with a plurality of recess spaces so that the press mold can be deformed, while at the same time reducing the internal stresses occurring in it.

Isostatic press mold for producing moldings from ceramic material

For the production of horizontally divided flaskless foundry molds a mold making plant is employed consisting of a vacuum mold blowing machine, joined with a casting and cooling line and a shake out station. The vacuum mold blowing machine is provide with a pattern plate swapping device and designed in the form of a single station mold making maching, in which drags and copes of a mold are produced alternately. The single mold flask is part of the mold making machine and has means for stripping it from a drag or cope before removal of the same from the machine. This makes it possible to have one core insertion station with space for a plurality of drag without having more than one machine flask.

Installation for the production of horizontally divided flaskless sand

A foundry mold making machine is so designed that at the start of the process of moving the pattern assembly clear of the mold, compressed air is supplied through the pattern assembly until a gap or narrow space has been formed between the mold and the pattern. In this respect an air-tight connection is maintained between the pattern plate support and the flask until the compressed air supplied to the gap has been relaxed. In this way it is possible to make certain that there is no damage to the edges of the mold by suddenly letting off air.

Method and apparatus for freeing a pattern or shaping element from

In an apparatus for producing molded articles from a pourable compound, such as an oxide-ceramic compound, for example a porcelain compound, an injection chamber is formed between an isostatic compression molding tool and an injection chamber. A suction opening is connected to the injection chamber. The pourable compound is supplied through an inlet opening. A fluidizing air inlet line is positioned in the compound inlet opening and it is movable relative to the inlet opening so that it can be placed in an open or closed position for admitting or blocking flow of the compound into the injection chamber.

Apparatus for producing molded articles from a pourable compound

A mold making machine the production of flaskless molds is made up of a sand supply container, with a blowing and squeezing grid at its lower, that is able to be moved vertically, a hollow pattern plate mount, valve and duct means connected with the said mount, and drag and cope flasks that are fitted around said sand container for vertical motion in relation thereto. At the start of a mold producing operation the drag flask is placed under the cope flask on the container. This design of the molding machine enables it to be used for the alternate production of flaskless drags and copes which are made into block molds.

Mold making plant

Apparatus for producing moldings from a dry, particulate or granular material such as a ceramic molding composition, comprises a first mold half carried on the base of a press, while a vacuum shooting head, a second mold half and a removal head are carried on a movable carriage supported by a press head of the press. The carriage is displaceable transversely of the pressing direction so that the vacuum shooting head, the second mold half, and the removal head can be successively brought into alignment with the first mold half to allow the molding process to be performed rapidly and continuously without long gaps in the successive pressing stages.

Apparatus for producing dry-pressed moulding from a particulate or

In the production of molded articles from a pourable substance, such as a porcelain substance, a hollow mold space is formed between a pair of horizontally displaceable compression mold parts. In the closed molding position, the mold parts are is spaced relation and form an annular gap laterally enclosing the mold space. An annular member forms a closure for the gap. The pourable substance is introduced into a passage through the closure member and through the gap into the mold space. A vacuum system is provided in the closure member in communication with the mold space during the step of filling the pourable substance into the mold space.

Device for the production of molded articles from a pourable substance

In the production of molded articles from a pourable compound, such as an oxide ceramic compound, for example, a porcelain compound, an injection chamber is formed between an isostatic compression molding tool and a superposed injection head, negative pressure conditions are established within the injection chamber. The pourable compound is fluidized and is drawn into the injection chamber by the negative pressure. Subsequently, the compound is isostatically compressed while the negative pressure conditions are maintained during at least the initial phase of the compressing operation. A closing member is positioned at the opening into the injection chamber through which the pourable compound flows. The closing member is displaceable between an open position admitting flow and a closed position blocking flow into the injection chamber. In the closed position, the surface of the closing member facing into the injection chamber forms a continuation of the adjacent surface of the injection chamber.

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Burtenbach, Germany

Eugen Buhler