Method and apparatus for freeing a pattern or shaping element from foundry material
OwnerEugen Buhlerinventor
Life of this patent
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Abstract
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.
Claims17
A method of freeing a pattern or shaping element from a mass of foundry material, that has been compacted against said element, using gas pressure, said element and said material being within a gas-tight enclosure made up of at least two parts that are able to be moved in relation to each other with a sealed connection therebetween while keeping up said gas pressure, comprising the steps of:
- forcing compressed gas into position between said element and said material so that the two are separated along an interface therebetween,
- further supplying said gas to said interface so that a gap is formed between the said element and the said foundry material, simultaneous with the step of further supplying said gas to said interface, moving the two parts of said enclosure away from each other to let said gap be formed,
- then shutting off gas supply to said enclosure,
- then unsealing said connection of said enclosure and moving said element clear of said compacted foundry material.
A mold and pattern assembly for clearing patterns from the molds using compressed air, comprising a pair of molds, at least one pattern plate, and a flask for use therewith, and means for maintaining a compressed, air-tight connection between the pattern plate and the flask during relative movement therebetween until a gap filled with compressed air has been formed between surfaces of the pattern plate and one of said molds.
Dependencies are inferred from the claim text.