Metal founding – Means to shape a forming surface – Including means for compacting particulate fluent mold...
Patent
1998-01-02
1999-03-16
Batten, Jr., J. Reed
Metal founding
Means to shape a forming surface
Including means for compacting particulate fluent mold...
164149, 164267, B22C 1500, B22C 1900, B22C 2302
Patent
active
058817972
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a mould-pressing machine with liquid-mist injection via at least one spray nozzle. The machine is suitable for producing parts by compacting particulate material, especially mould sand, and includes: towards at least one other mould-chamber wall so as to compact particulate material therebetween; and mould chamber prior to the mould chamber being filled with particulate material by means of said filling means, said liquid mist being formed by at least on atomizing nozzle in which a liquid supplied under pressure is atomized by means of an air current, said atomizing nozzle comprising: liquid-in-air dispersal, aperture for supply of the liquid, aperture in the immediate vicinity of said first nozzle aperture for supply of atomizing air, and valve member spring-biased towards the closed position and capable of being moved away form said closed position under the influence of pressure in liquid supplied to said first nozzle aperture; second nozzle aperture or apertures; first nozzle aperture or apertures solely during the periods during which production of said liquid mist is desired.
BACKGROUND ART
Mould-pressing machines of the kind referred to above are e.g. known from U.S. Pat. Nos. 5,494,094 and 4,791,974.
In mould-pressing machines of the kind referred to above, usually being adapted to operate automatically producing series of casting moulds or casting-mould parts, it is of crucial importance that the correct quantity of liquid mist be injected in each cycle. Thus, an excess of liquid mist will, in addition to increasing the costs, create an unnecessary load on the environment, while too small quantities of liquid mist will result in an insufficient "lubrication" of the mould-chamber walls, in the worst case possibly causing parts of the compacted object to stick to the patterns mounted on the mould-chamber walls and thus make the mould part unsuitable for pouring.
Thus, it is desirable to inject the least possible quantity of liquid with the liquid mist, while at the same time ensuring with absolute certainty that the mould is lubricated sufficiently.
It is a relatively simple matter to ensure that the quantity being supplied to the system in each operating cycle is held below a predetermined upper limit, this effect e.g. being attainable by means of a suitably time-controlled and cycle-controlled pump only applying pressure to the liquid to be atomized in a period corresponding to the desired quantity of liquid mist for each operating cycle. Thus, the maximum quantity of liquid that it is possible to advance through the liquid path with a given pressure at a given moment in time sets the upper limit for the quantity of liquid.
On the other hand it can, however, be difficult to set the lower limit for the quantity of liquid being supplied to the liquid mist, a number of relationships coming into play. Thus, it is of primary importance that the liquid quantity being supplied is converted into a uniform liquid mist being distributed uniformly on the mould chamber walls, so that a sufficient quantity of liquid will be deposited on these walls to provide the requisite lubrication. If the nozzle aperture or other parts of the nozzle are contaminated by particulate mould material or other particles, this will have a negative effect on the formation of the liquid mist and the quantity of liquid being introduced into the mould chamber.
For this reason, the prior art referred to initially comprises the use of nozzles, in which it is possible to maintain a continuous air stream through the outlet aperture, making it difficult for particles from the mould chamber to penetrate into the apertures.
In these nozzles, the liquid mist is formed by liquid being injected from a first nozzle aperture into a vortex chamber, in which it is mixed with the atomizing air being blown into the vortex chamber from a second nozzle aperture, after which the liquid mist is discharged from the outlet aperture or apertures.
With this known technology, it has been difficult to form
REFERENCES:
patent: 4541473 (1985-09-01), Onoe et al.
patent: 4758142 (1988-07-01), Voss et al.
patent: 5582227 (1996-12-01), Schuch et al.
Derwent's Abst., No. 95-2063222/27, week 9527, JP 5-270383, Oct. 28, 1993.
Batten, Jr. J. Reed
George Fisher Disa A/S
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