Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1995-12-29
1998-03-24
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
164137, 164333, B22D 1908, B22D 3304
Patent
active
057302006
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for gripping a casting core, in particular a sole core of the type having at least one recess, opening, passage, or the like, which is adapted to be engaged by the gripping apparatus. Furthermore, the invention relates to a method of gripping a casting core, in particular a sole core, with the use of the apparatus in accordance with the invention.
Generally the present invention relates to the field of casting practice. For casting molded pieces, in particular engine blocks, casting cores or molds are usually made separately, then combined and joined to one another to form a casting mold or a core assembly. To this end, it is necessary to move the individual cores, for example, sole cores and water-jacket cores for making an engine block, relative to one another, to stack same and, as the case may be, to join same with further structural components, before they may be filled with molten metal for making, for example, a metallic workpiece, such as an engine block.
Known from practice are apparatus for gripping casting cores, in particular within the scope of common transportation devices for casting cores and molds. To document this prior art, reference may be made, for example, to U.S. Pat. No. 5,156,255 and DE-OS 41 02 568, both being applicant's own published documents.
The known apparatus are so-called inside grippers which are used to engage in recesses in casting cores and molds, in particular in sole and water-jacket cores. These inside grippers are provided with clamping means in the form of a pressure chamber with an elastic outside wall, which is "inflated" hydraulically or pneumatically. Once inserted into the recess and activated, the outside wall of the inside gripper is pressed against the entire inside wall of the recess in the core, so as to permit the core to be raised as a result of the resulting frictional engagement.
However, the known inside grippers are problematic insofar as they press, within the recess, against the entire inside wall of the core, thereby presenting a considerable risk of damaging the core, in particular a thin sole core. Furthermore, the known inside grippers have only two operating conditions, namely a deactivated and an activated state, so that they do not permit an adjustment to different wall thicknesses or to sensitive characteristics of the core being gripped. Finally, hydraulically or pneumatically operating inside grippers require substantial sealing measures, the engaging outside walls of the inside grippers being mostly made of rubber or a rubberlike material. This material is subjected to very considerable wear.
It is therefore an object of the present invention to improve and further develop an apparatus for gripping or handling a casting core, in particular a sole core of the type described above, so that a simple construction permits automatic handling of cores, thereby preventing at least to a large extent damage to the cores and excessive wear on the gripping device.
Another object is to provide a method of gripping a casting core, in particular a sole core with the use of the apparatus of the present invention, it being possible, within the scope of this method to also combine in particular a sole core with a structural member that is to be assembled, such as a cylinder liner, and a further component, such as a water-jacket core.
SUMMARY OF THE INVENTION
The above and other objects and advantages of the present invention are achieved by the provision of a gripping apparatus which comprises a support housing, and gripping means including a pair of gripping jaws mounted to the support housing for being received in the opening of the casting core and for then pressing against the inside wall of the opening with a predetermined force and so as to grip the casting core.
It has been recognized by the present invention that a so-called inside gripping device may be constructed in a simple manner, in that the gripping means is made in the form of gripping jaws. As a result of this
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patent: 4927205 (1990-05-01), Bowler et al.
patent: 5156255 (1992-10-01), Landua et al.
patent: 5322300 (1994-06-01), Mistrater et al.
patent: 5324049 (1994-06-01), Mistrater et al.
Adolf Hottinger Maschinenbau GmbH
Lin Kuang Y.
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