Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1997-12-22
2000-07-25
Batten, Jr., J. Reed
Metal founding
Process
Shaping liquid metal against a forming surface
164131, 164168, 164344, B22C 1110, B22D 2900, B22D 3304, B22D 4702
Patent
active
06092585&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for conveying moulds with castings therein. In the method to which the invention relates, a mould string having castings in casting cavities formed between closely juxtaposed mould parts leaves a foundry plant which includes a mould-making station and a pouring station. The casting cavities are present at the mainly vertical parting surfaces between successive mould parts, and each mould occupies a given length in the longitudinal direction of the mould string. The mould string is moved on a precision conveyor and is thereafter transferred to a second conveyor. The second conveyor referred to is normally of a relatively light construction.
BACKGROUND ART
When making castings by pouring moulds with vertical parting surfaces, the moulds will normally be advanced along the pouring track on a precision conveyor, e.g. of the kind described in the DK patent publications Nos. 119,373 and 127,494; in this manner, the moulds or mould parts are placed in mutual abutment in a highly accurate manner, and this accuracy is maintained during the steps of pouring and solidification. After the pouring step, the moulds may be transferred to a conveyor of the kind described in DK-patent publication No. 138,840, making it possible to reduce the total frictional resistance against the movement of the moulds.
For the reasons referred to above, the moulds are frequently transferred at a relatively early stage in the process from the precision conveyor to a second conveyor producing less frictional resistance than the precision conveyor. This second conveyor may possibly be constituted by an endless belt. During the transfer to the second conveyor it must be ensured, either that the casting is sufficiently cooled to avoid the occurrence of cooling defects or deformations, or that the individual moulds are transferred in a manner preventing mutual displacements of the mould parts, possibly being the cause of deformations or cooling defects, respectively. Because of these relationships, the string of moulds will normally be transferred as a solid body through the second conveyor and advanced--still undivided--on the latter, until the castings have been cooled sufficiently, eventually to reach an extraction station.
An alternative to conveying the string of moulds as a continuous string to the extraction station is based on the use of devices to divide or break open the moulds in the mould string, e.g. of the kind shown in DK-B-129,397, in which such a device removes the central part of the moulds together with the castings. This alternative will, however, require the use of complicated equipment, the latter frequently having to be adapted to the particular castings being made and the particular moulds being used at any moment, especially when there is a change in the dimensions. Further, such an intermediate station will produce dust and fragments to be accounted for, as they can constitute a health risk and contribute to increased wear on moving parts.
Normally, however, the string of moulds will be advanced in the form of a continuous string on the second conveyor until the castings are cooled sufficiently for the extraction step. Further, if the second conveyor consists of flexible material incapable of withstanding high temperatures, such as e.g. is the case with endless belts of rubber or plastic material, it must be ensured, either that the castings do not come into contact with the conveyor belt during the extraction, or that the castings are cooled to a temperature not causing damage to the conveyor belt, the latter temperature frequently lying far below the temperature of solidification of the castings, thus requiring a disproportionately long cooling time on the conveyor belt.
A previously known automatic casting machine of the kind referred to above operates in the following manner. The moulds or mould parts are produced in a mould-making station, from which they are conveyed in the form of a closely packed string of moulds by a precision conveyor along a trac
REFERENCES:
patent: 3840066 (1974-10-01), Taccone
patent: 3967667 (1976-07-01), Wallwork
patent: 4112999 (1978-09-01), Gasper
patent: 4438801 (1984-03-01), Buhler
patent: 4846251 (1989-07-01), Achinger
Jespersen Emil
Larsen, deceased Jens Peter
Batten, Jr. J. Reed
Georg Fischer Disa A/S
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