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- W1980457325 abstract "Conservation of the direct process energy in the manufacture of metal parts is maximized by following three basic rules: form parts to virtually final dimensions (near net shape) with minimum machining requirements; when scrap generation is unavoidable, make every effort to recycle the scrap effectively; avoid using primary metal and, whenever possible, avoid remelting operations. The ideal manufacturing process associated with minimum energy consumption is thus one which uses scrap metal generated from other processes, converts it via mechanical compaction into a usable product, and generates no scrap of its own. Experimental studies have shown that this ideal can indeed be rendered into reality with but a few compromises to guarantee the end properties of the finished part. Scrap metal, in the form of shop turnings and drillings (swarf) or “needles” resulting from a melt-spinning operation, was compacted in dies at elevated temperatures to produce near-net-shape parts of commercially acceptable tolerances and mechaical properties. The hot-pressing process has so far been applied successfully to a number of materials, the most consistent results being with aluminum alloys. The strength and ductility of hot-pressed parts are largely dependent on the degree of metal flow — and surface oxide fragmentation — achieved during the hot compaction. Complex shapes benefit from a two-stage operation, whereby a perform made in the first stage is deformed plastically in the second stage to achieve higher mechanical properties. It was also observed that hot pressing of aluminium swarf consumes only 10% of the energy required in aluminium powder metallurgy and less than 2% of the energy required to produce aluminium parts by casting and forging." @default.
- W1980457325 created "2016-06-24" @default.
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- W1980457325 date "1982-03-01" @default.
- W1980457325 modified "2023-09-29" @default.
- W1980457325 title "Material recycling and energy conservation possibilities with scrap hot pressing" @default.
- W1980457325 doi "https://doi.org/10.1016/0378-3804(82)90005-5" @default.
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