Metal founding – With signal – indicator or inspection means
Patent
1986-09-25
1988-08-23
Godici, Nicholas P.
Metal founding
With signal, indicator or inspection means
164 41, 7386463, 73DIG9, B22D 200, B22D 4600
Patent
active
047653914
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for use when thermally analyzing and modifying molten metal. More specifically, the invention is intended for use when analyzing the solidifying properties of molten metal prior to pouring the metal into moulds, and particularly, although not exclusively, to the solidifying properties of light-metal melts, such as aluminium and magnesium melts.
It is known to analyze thermally the properties of molten metal, hereinafter referred to as melts, and to utilize the results of the analysis to determine the solidification properties of the melt and the post-solidification structure of the metal. It has been found possible to derive from solidification data such properties as the number of nucleants present, the nucleant activity, and the presence of modifying substances with regard to their function during solidification. In this context, a chemical analysis does not provide sufficient information with respect to the ability of the elements present to function as crystallization nuclei and structure modifying additions.
A common method of procedure in this respect is one in which solidification data is determined with the aid of a thermoelement located in the centre of a sample taken from the melt. This sample is of the order of about 100 ml, which is considered sufficiently large to ensure that the thermal capacity of the vessel containing the sample and the thermoelement will not unduly influence solidification. The solidification data assessed is primarily the super-cooling prior to solidification commencing, which reflects the number of primary crystallisation nuclei present and the slope of the temperature curve during the plateau phase as the crystals grow. These values can be recorded digitally and, with the aid of known techniques, compared with desired values of respective magnitudes, and the result obtained therewith utilized in the modification of the solidification properties of the melt, by adding structure modifying substances thereto, or by subjecting the melt to some known metallurgical process effective to change the solidification properties of the melt. In accordance with the invention there is provided an arrangement which can be used to monitor the structure controlling properties of a melt and to control the addition of structure modifying substances thereto, or to control the execution of structure changing measures. The arrangement enables foundries, smelters etc., to be automated to a high extent and also enhances the quality of the goods produced therein.
The arrangement according to the invention for use when thermally analyzing and modifying melts, such as molten metal baths, by recording solidification data of the melt and controlling the possible addition thereto of structure modifying substances on the basis of said analysis is characterized by a sampling container which is made from a material which remains substantially stable at melt temperatures and into which molten metal is able to pass when the container is immersed in the melt; means which are effective to lift the sampling container from the melt, while enclosing a given quantity of molten metal in said container, and to move the container to an area of controlled temperature and to hold the container in said area until the enclosed molten metal has solidified, and then to return the container to an immersed position in the melt; means for measuring and recording solidification data at one or more locations in the enclosed molten metal during the process of its solidification; means for evaluating the solidification data obtained in relation to data derived from melts of known metallurgical structure; and means which are effective to control the supply of additions to the metal melt; and control means for monitoring continuously structure-influencing additions, by intermittent sampling at suitable time intervals.
The sampling container is conveniently provided with an opening through which molten metal can flow, such as to enable the content of the container to be constantly rep
REFERENCES:
patent: 4003260 (1977-01-01), Catoul
patent: 4204431 (1980-05-01), Schulz
Godici Nicholas P.
Seidel Richard K.
Sinter-Cast AB
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