FR2562913A1 - PROCESS FOR OBTAINING MOLDED PARTS AND BILLETS IN A NORMALIZED ALLOY WITHOUT GOING THROUGH THE LINGOT STAGE - Google Patents

Abstract

Process for obtaining moulded parts and billets in a standardized alloy without passing by the stage of ingots, characterized in that the productive foundry of parts utilizes directly in the furnace metal lumps and scrap of which the analysis is initially undefined, but which have been previously mixed with other metals in order to obtain a standard analysis. Process characterized in that it is particularly intended to the production of pressure moulded parts of aluminium alloy AS9U3 by starting directly from aluminium waste reduced into fragments by crushing.

Description

 The object of the present invention is to do away with the melting and ingot stage to obtain molded parts and billets from pieces and scrap of metal.

 Currently, in my metallurgy of 2nd fusion of metals, in particular aluminum, we start from old molded parts called casings, boards, profiles and pieces and scrap of aluminum obtained after grinding.

 These pieces and scrap of aluminum contain other metals, impurities and waste rock unsuitable for the manufacture of aluminum alloys which make a sorting essential which, after crushing, can between done manually, by density, ventilation, gravity , flotation, etc ... The purpose of sorting is to eliminate unwanted constituents in the manufacture of aluminum alloys including zinc, zamack, copper, lead, stainless steel, magnesium, etc ... as well as non-metallic materials, plastic, earth, wood, rubber, etc.

The clean aluminum pieces thus obtained are melted in an oven. On the occasion of this fusion, an analysis correction is carried out to bring them into conformity with the standards and specifications. The liquid alloy thus obtained is poured into shapes. intended for making ingots. After cooling, the ingots are placed in piles then delivered to the various foundry, steelworks or laminator users;
The invention consists, once the pieces and scrap of aluminum have been sorted, in using a defined quantity of 1.5, 10 or 100 tonnes called "batch". By batch is meant a certain quantity of pieces and debris such that the size of the pieces allows homogenization by stirring, by mixing, etc. It will be necessary to carry out a new grinding if the size of the pieces is not in conformity. The batch consists of different alloys in unknown proportions.

Knowledge of the average analysis of the batch is obtained by founding a few kilograms of pieces and debris carefully removed. From this fusion, a medal is drawn. The analysis of this medal will be representative of the analysis of the lot regardless of its weight,
The average analysis will make it possible to know the necessary corrections to be made to the batch for the compliance of the various constituents according to the chosen analysis.

 Depending on the initial analysis, corrections can be made with richer or poorer pieces or granules of metal whose content is to be corrected. It will be possible in particular to use for the analysis correction other pieces and scrap of aluminum previously sorted whose average analysis is likely to modify the analyst of the batch in the desired direction.

 In addition, copper, silicon, manganese, etc. can be added to the batch, in the form of pure metal or an alloy, which is preferable.

 The addition of these analysis-modifying pieces will be intimately mixed with the batch using a drum for example.

 The batch, the average analysis of which is thus made to comply with standards, will be delivered directly to consumers: foundries, steelworks or laminators for Besides put as is in the ovens. These pieces and granules will be substituted for the ingots usually used in ovens.

 The fusion of the different pieces will create the homogenization of the metal around the producer of molded parts and billets.

 The delivery of the batch can be done on pallets with cardboard, in bags, in containers or in bulk allowing the automatic loading of the ovens.

 The invention can be applied particularly to the production of die-cast parts made of aluminum alloy AS9U3.

Claims (5)

REVENI) ICATIONB  1) Process for obtaining castings and billets in a standardized alloy without going through the ingot stage, characterized by the fact that the foundry producing the parts uses directly in its furnace pieces and scrap of metals whose analysis at departure is undefined, but which have been previously mixed with other metals to obtain a standardized analysis,  2) Process according to claim I characterized in that waste having an average composition is used for the analysis of the batch without proceeding to the total fusion of the batch.  3) Method according to claims 1 and 2 characterized by the possibility of modifying the analysis of the batch by adding different metals or metallotdes in pieces or granules which will be added to the batch and mixed very intimately, This will determine a new average analysis likely to '' be further modified after analysis and so on Until the desired average analysis is obtained,  4) Process according to claims 1,2 and 3 characterized by the direct loading, in the melting furnaces of the factories producing producing molded parts and billets, pieces of debris giving after fusion an analysis in accordance with the standards.  5) Method according to all of the preceding claims characterized in that it is particularly intended for the production of die-cast parts in aluminum alloy AS9UA starting directly from aluminum waste reduced by grinding into fragments.