Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1981-10-23
1984-03-27
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
164323, 164 29, B22D 4702
Patent
active
044388012
DESCRIPTION:
BRIEF SUMMARY
The present invention is with respect to a process and an apparatus for the transport of a train of flaskless molds along a storing, teeming and cooling conveyor in a foundry and having at least one straight conveyor run, new teeming molds joining, one after the other, a back end of the mold train and filled molds being taken therefrom at the same rate from a front end of the train.
On working with flaskless molds, the reinforcing effect of a flask is not produced. Mold flasks are, generally speaking, high-price structures which have a very high wear rate and are very likely to be damaged. The use of flaskless molds, for this reason, keeps down running costs under the level if flasks are used. However, it has been seen from experience that, because there is no flask reinforcing effect, mold parts may be broken or bent or parts of them get out of line with each other. Furthermore, the mold parts may become greater in size than is desired so that more waste is produced. These shortcomings are not fully taken care of by known flaskless molding systems of the sort in question: For reinforcing the side faces of the molds, running in the transport direction, attempts have been made, it is true, at using gripping plates or guiderails or the like running along the length of the mold train. In most cases the end faces running normal to the direction of transport of the molds are not normally reinforced; if the molds have horizontal parting planes, or if the parting planes are upright, the end faces will frequently be acted upon by forces likely to be the cause of castings being produced which are not true to size.
German Auslegeschrift specification No. 2,417,197 is with respect to an apparatus of the sort noted with a wheel conveyor between a mold-producing station and a shake out station, the wheels turning about fixed axes and being used for supporting a palette with one horizontally parting mold on it. In the case of this known system, the palettes are longer than the molds. For this reason, the ends of the palettes are kept against each other for transmitting the forwardly acting and braking forces. The separate molds are spaced. Because the separate molds are not reinforced or gripped in the transport direction, it is possible for expansion to take place with the outcome that the castings may not be true to size. The thermal expansion taking place after teeming is frequently so high that the spacing between the molds as noted may be bridged over. If the expansion of the cope and the drag is different or if the cope is somewhat smaller than the drag in size, there may be undesired slipping of the cope on the drag, this danger being more specially likely in the case of a mold waiting its turn to be filled and next to the last mold to be filled. Quite in addition to this, however, the thermal expansion, which is not limited in the known system, of the molds is responsible for "growth" of the castings if a material is being processed which undergoes expansion while cooling down, for example with gray cast iron in the graphitization stage.
In the case of further known systems (see German Pat. Nos. 1,583,526 and 1,783,120), use is made of a power conveyor belt onto which the molds are pushed. On braking the conveyor belt the belt will, however, still go on moving to a certain degree uncontrolledly so that it is not possible to make certain that the molds are kept together without any spaces therebetween, this being necessary if they are to have the effect of supporting each other in the transport direction. If, in this respect, on the other hand the overall forward force takes effect on the last mold in the train, that is to say the last mold in the direction of transport, and the conveyor belt is moved by the mold, something which has been attempted more specially in the case of molds with upright parting planes, there would be an overgreat danger of the mold being crushed. In the case of such systems as well there is, for this reason, no regular and full reinforcement of the molds.
On the footing of this prior ar
REFERENCES:
patent: 4040472 (1977-08-01), Lundsgart
patent: 4180156 (1979-12-01), Popov et al.
Collard Allison C.
Galgano Thomas M.
Lin Kuang Y.
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