Abstract

 
 
 n this article various technological schemes for processing waste in the form of chips of an alloy of an aluminum-silicon system are presented. It was noted that the processing of fine waste of the chips type is always accompanied by oxidation of the metal due to the large surface of contact with the air. To eliminate the loss of metal into oxides during re-melting, this study proposes processing chips by pressing to obtain briquettes (a method of hot extrusion is meant by ‘pressing’). Processing involves the receipt of briquettes from rods. The processes of cold and hot briquetting were undertaken separately. The results of applying the scheme using real production waste are presented in this study. The tensile strength achieved was up to 270 MPa. The relative elongation to rupture was 10–25% and the area reduction after rupture was 25–45%. There were no large differences in the use of briquettes obtained by cold processing and hot processing. The conclusion is drawn about the overall effectiveness of the application of the waste processing without the use of the metal melting.
 Keywords: silumin, shavings, extrusion, plastic deformation, heat treatment
 
 
Highlights
Two fundamentally different approaches are possible in solving problems aimed at finding and implementing the most effective ways of involving in the production turnover of bulk chip waste from aluminum alloys
This approach was tested in relation to the processing of high-quality bulk chips of silumin AK12 produced during the machining of alloy wheels billets, manufactured at one of the enterprises included in the RUSAL holding
The purpose of the study was a phased comparative analysis of the mechanical properties of bar-wire products, obtained as a whole using a single approach to its manufacture from shavings of AK12 alloy in one case of cold-briquetted, and in another - from hot-pressed briquette blanks
Summary
Two fundamentally different approaches are possible in solving problems aimed at finding and implementing the most effective ways of involving in the production turnover of bulk chip waste from aluminum alloys. The negative sides of this method, associated with significant surface oxidation and increased metal waste, lead to large losses; chips as secondary raw materials are the least valuable component of the charge [1, 2]. Another more promising in our opinion approach, implies a complete rejection of remelting of chip waste and consists in incorporating into the general technological scheme for their processing separate methods of powder metallurgy and pressure treatment, in particular, briquetting, hot extrusion and cold drawing operations [3, 4].
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