Aluminum products such as fasteners and automotive components are often produced by cold extrusion because it facilitates high volume production of near-net-shape parts. This article describes the cold extrusion process for aluminum alloys and the associated requirements for tooling, dies, punches, and other equipment. It covers typical tool materials and their working properties, and provides best practices for sizing aluminum slugs and preparing them for use. The article also discusses the wide range of achievable shapes from shallow cup-like extrusions to deep cups and complex parts with longitudinal flutes, stems, and grooves.
S. Lampman, Cold Extrusion of Aluminum Alloys, Aluminum Science and Technology, Vol 2A, ASM Handbook, Edited By Kevin Anderson, John Weritz, J. Gilbert Kaufman, ASM International, 2018, p 311–314, https://doi.org/10.31399/asm.hb.v02a.a0006526
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