Metal founding – Means to shape a forming surface – Including means for compacting particulate fluent mold...
Patent
1994-09-15
1996-06-11
Seidel, Richard K.
Metal founding
Means to shape a forming surface
Including means for compacting particulate fluent mold...
164201, B22C 1524
Patent
active
055247032
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to an apparatus for shooting foundry cores or molds with molding materials, the apparatus comprising a shooting head with an inlet side and an outlet side, a shooting plate associated to the shooting head and containing at least one shooting nozzle, and a clamping head associated to the shooting head on its inlet side and having at least one air supply for a leakproof application of compressed air to the shooting head, the clamping head being movable by means of a cylinder-piston arrangement.
In the foundry practice, core shooting heads have been known for many years. For casting molded products, the foundry cores and molds are molded of core sand separately in most cases, then combined and joined to one another to from a foundry mold. An essential component of the core-shooting machines are the so-called shooting heads with shooting plates accommodating the shooting nozzles. It has been common practice to fill the core sand, i.e. quartz sand compounded or coated with binding agents, into the shooting heads in question, whence it is blown or shot under a very high air pressure through nozzles arranged in the shooting plate into the respective molds.
Known per se from DE-OS 23 04 564 is an apparatus for automatically making molds and cores for use in foundries, in which the molding sand is injected into the shooting head, together with the compressed or shooting air necessary for the shooting, from a vertically rigidly mounted hopper. The compressed air enters via a connection laterally arranged on the shooting head directly into the interior of the shooting head, the connection for the compressed air being provided on the side of the shooting head. As it enters, the compressed air swirls the sand falling into or being already in the shooting head, so that local turbulences occur within the shooting head. After its entry into the shooting head, the compressed air impacts upon the opposite wall of the shooting head, whence it is deflected and redirected toward the sand.
Accordingly, the compressed-air supply occurs in an uncontrolled manner, inasmuch as a controlled, homogeneous biasing of the sand with compressed air is absent within the shooting head. The "compressed-air jets" locally occurring in the known apparatus drill, so to speak, holes into the sand being in the shooting head, or even cause the sand to precompact locally, which in most cases has already been mixed or coated with binding agents. As a result of this inhomogeneous injection of compressed air and premature compacting, it is therefore necessary to increase again the pressure necessary for the shooting.
Thus, as in the above-described apparatus of the prior art, there exists the risk that the molding sand is unintentionally precompacted already in the shooting head, so that substantial pressures are needed for the actual shooting. Moreover, the molding sand already accelerated by the shooting air drops from a considerable height into the shooting head, thereby tending to create an unwanted, premature compacting as a result of its own weight, and causing an uneven distribution of the molding sand in the shooting head.
The apparatus known from practice, or at least in part from DE-OS 23 04 564 is however also problematic, inasmuch as upon completion of the core shooting process, it requires that the clamping head be separated from the shooting head, so as to permit sand to be reloaded via a corresponding hopper device or the like. Upon opening the shooting head or one of the valves associated with the shooting head, the compressed air remaining in the shooting head escapes suddenly therefrom, and entrains to the outside of the shooting head not only suspended particles, but also sand particles, miniature particles and free resins. As a consequence thereof, the surrounding of the apparatus in question is polluted or contaminated on the one hand, and surrounding machine parts are subjected to an increased, abrasive wear by the backflow of particles. Likewise, it is possible that sand particl
REFERENCES:
patent: 3089207 (1963-05-01), Miller
patent: 5052465 (1991-10-01), Erana
Patent Abstracts of Japan, vol.4., No. 143, JP, A, 55 097 845, Appl. No. 54-5381, Jul. 25, 1980.
Landua Werner
Muller Jurgen
Adolf Hottinger Maschinenbau GmbH
Herrick Randolph S.
Seidel Richard K.
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