Metal founding – Means to shape a forming surface – Including means for compacting particulate fluent mold...
Patent
1996-06-11
1997-12-30
Batten, Jr., J. Reed
Metal founding
Means to shape a forming surface
Including means for compacting particulate fluent mold...
164186, B22C 1104, B22C 1312, B22C 1526
Patent
active
057019460
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for shooting foundry cores or molds with a shooting arrangement, a set of tools comprising an upper tool and a lower tool, and a tool change mechanism rotatable about a vertical axis and comprising two tool changing frames, each rotatable frame being adapted for alternate movement into and out of the shooting arrangement.
In the foundry practice, core shooting machines have been known for many years. For casting molded products, foundry cores or molds are in most cases made as separate parts, combined, and joined together to form a casting mold. An essential component of the core shooting machine is the so-called shooting head with shooting plates accommodating the shooting nozzles. Molding material, in particular core sand, i.e. a quartz sand previously compounded or coated with binding agents is supplied to the shooting heads under discussion, from which it is blown or shot under a very high air pressure into the respective molds through the nozzles arranged in the shooting plate.
Known from DE 34 22 687 is an apparatus for shooting foundry cores or molds of the described kind, the apparatus being provided likewise with a tool change mechanism rotatable about a vertical axis and having two tool change frames. The tool change mechanism provided in the prior art apparatus serves to change an entire set of tools, i.e., to change both the upper tool and the lower tool. Shot cores need to be ejected or removed before a tool change. However, should it be desired that shot cores be combined with any loose parts whatsoever, or that loose parts be even introduced into the core being shot, the known apparatus will not be suitable for shooting foundry cores or molds. Primarily, when loose parts are handled by hand together with the finished cores, the known apparatus will permit only an unsatisfactory throughput.
It is therefore the object of the invention to improve and further develop an apparatus of the initially described kind, so as to realize an optimal exploitation or utilization, even when shot cores are combined with loose parts that are to be inserted, for example, by hand.
SUMMARY OF THE INVENTION
The above and other objects and advantages of the present invention arte achieved by the provision of an apparatus which comprises a core shooting arrangement which includes a support frame. A shooting head is mounted on the support frame, and an upper tool is mounted on the support frame below the shooting head. At least one lower tool is provided, and a tool change mechanism supports the one lower tool and moves the same between an operative position located below the upper tool and a withdrawn position. The tool change mechanism is rotatable about a vertical axis and includes two diametrically opposed tool change frames, such that the two change frames may be alternately moved horizontally between the operative and withdrawn position. A lifting table is mounted to the support frame below the operative position of the tool change mechanism and is configured for lifting the one lower tool from the mechanism and moving the same upwarding against the upper tool to form a mold which may then be filled by the shooting head. When the lifting table is lowered, the lower tool and the resulting molded core are separated from the upper tool and the lower tool is repositioned upon the mechanism, and the mechanism is then able to move the lower tool and molded core to the withdrawn position where the molded core may be removed from the lower tool.
In accordance with the invention it has been recognized, first of all, that the tool change mechanism known per se can be used in ideal manner to adapt cycle times within the core shooting arrangement to corresponding processing times outside the core shooting arrangement, the tool change frame rotated into the shooting arrangement serving only to receive the lower tool carrying the cores. Essential is that now the lower tool carrying the cores can be rotated by means of the tool change mechanism out of the s
REFERENCES:
patent: 4969503 (1990-11-01), De Foronda
patent: 5024161 (1991-06-01), Fischer et al.
Rommel Reiner
Stangler Ulf
Adolf Hottinger Maschinenbau GmbH
Batten, Jr. J. Reed
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