Metal founding – Means to shape a forming surface – Including means for compacting particulate fluent mold...
Patent
1997-03-12
1998-06-02
Lin, Kuang Y.
Metal founding
Means to shape a forming surface
Including means for compacting particulate fluent mold...
164230, B22C 1312
Patent
active
057587108
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for inserting a part into a foundry core being completed to a core assembly between two core shooting stations.
Basically, the present invention relates to the field of foundry practice. To produce castings, foundry cores or foundry molds are generally made as separate parts, combined and joined together to form a casting mold or core assembly. Thereafter, these core assemblies are filled with molten metal for producing, for example, a metallic workpiece. In mass production, the core assemblies being filled with molten metal pass one after the other through the production line.
Apparatus for producing core assemblies are known already from numerous publications. Only as an example, reference may be made to DE-OS 23 04 564. Furthermore, it is known from practice to make cores that are to be combined to a core assembly, in a production line with several core shooting machines or shooting stations. At each shooting station, a further core is added to the core assembly. To this end, the cores are deposited on a conveyor plate which passes through the individual shooting stations. In most cases, this conveyor plate is used simultaneously as the lower tool of the first shooting station.
In the present case, the apparatus involves basically the insertion of any kind of parts respectively into or onto a foundry core. In this process, the part or parts is or are combined together with the foundry cores to a core assembly. Consequently, in the present case, parts are inserted which consist at least quite predominantly of other materials than shot core sand. In the following, however, the apparatus under discussion will be explained only by way of example and for a better understanding with reference to parts, which are inserted as so-called screen inserts or solidification screens respectively into or onto a foundry core.
In practice, it has shown to be advantageous to provide the core assembly in a lower region with a screen insert or a so-called solidification screen, through which the molten metal can be poured, and is allowed to rise in the core assembly from the bottom and to thus fill the mold. In other words, the molten metal is poured into a channel formed by the individual cores, until it arrives in the lower region, preferably at the lowest core, at the screen insert. After passing through the screen insert, the molten metal is allowed to rise in the core assembly gradually upward and to fill gradually the contours of the core assembly. Normally, the screen insert is a braided, fine-meshed screen, which is produced from a wire with a diameter of about 0.5 mm. The screen as a whole has a diameter of about 6 mm and a mesh width of 2 mm. As a whole, the screen has a thickness of about 1.3 mm, which is in this instance only a representative configuration.
To secure the screen in its position, it has been common practice to provide the lower core with a corresponding recess in the edge region of the pouring channel. Into this recess, the screen has until now been inserted by hand. If the screen is to be inserted into the lower core, this manual insertion will have to occur after the first shooting station. If it is not desired to remove shot--lower--cores from the conveyor plate, an operator will have to insert the screen between the first and the second shooting station. To this end, it is necessary that at least the region between the first and the second shooting station be freely accessible. Apart from arrangements that are necessary in this instance to prevent occupational accidents, the manual insertion of the screen is not only difficult, but also constantly subject to errors. Moreover, the manual action as has until now been necessary, allows to reduce cycle times only to a limited or insufficient extent.
It is therefore the object of the present invention to describe an apparatus for inserting a part into a foundry core being completed to a core assembly, which apparatus facilitates fully automatic handling of the part being inserted an
Landua Werner
Pichler Werner
Adolf Hottinger Maschinenbau GmbH
Lin Kuang Y.
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