{"id":4499,"date":"2026-10-15T01:17:03","date_gmt":"2026-10-15T09:17:03","guid":{"rendered":"https:\/\/al-forging.com\/aluminum-forging-design-guidelines\/"},"modified":"2026-10-28T21:55:42","modified_gmt":"2026-10-29T05:55:42","slug":"aluminium-forging-design-guidelines","status":"publish","type":"post","link":"https:\/\/al-forging.com\/es\/aluminium-forging-design-guidelines\/","title":{"rendered":"Aluminium Forging Design Guidelines: Draft Angles, Fillets, Tolerances, and Alloy Selection"},"content":{"rendered":"

A well-engineered part starts long before the first stroke of the press. Aluminium forging design guidelines<\/strong> help engineers turn a functional requirement into a shape that is strong, lightweight, cost-effective, and actually manufacturable at volume. Whether you are sourcing brackets, housings, transmission parts, or structural components, the design decisions you make on alloy, draft, fillets, and tolerances determine whether forging delivers its full advantage \u2014 or merely costs more than machining from solid stock.<\/p>\n

This guide walks through the rules we apply every day at our forging plant, and shows where they intersect with the manufacturing process itself.<\/p>\n

Why Forged Aluminium Needs a Different Design Approach<\/h2>\n

Cast and machined parts can tolerate geometries that are impossible to forge. A closed-die forging<\/a> forms the metal by squeezing it between two hardened dies, so the part must let material flow and then release from the tool. That single constraint is why forging beats casting<\/a> for fatigue-critical and leak-tight parts, but also why naive “machining-style” drawings fail at the die.<\/p>\n

The reward is material that is denser, finer-grained, and free of the porosity you find in castings. To capture that reward, the designer works with the process instead of against it: symmetric sections, generous radii, and draft that lets the forging eject cleanly. Done right, you get a near-net-shape blank that needs only light CNC finishing.<\/p>\n

\"Process
Process chain: hot forging, surface preparation and finishing<\/figcaption><\/figure>\n

Choosing the Right Alloy: 6061, 7075, and Billet Stock<\/h2>\n

Alloy selection is the first and most consequential forging design decision. The two workhorses are 6061 and 7075, and the trade-off is well documented in our 6061 vs 7075 comparison<\/a>. 6061-T6 offers excellent corrosion resistance, good weldability, and easy machining \u2014 the default for most structural and enclosure work. 7075-T6 trades some corrosion resistance for roughly 1.5\u00d7 the strength, making it the choice for aircraft, drivetrain, and high-load brackets.<\/p>\n

Heat treatment is where properties are actually locked in; our 6061-T6 heat treatment guide<\/a> explains why solution heat treatment and artificial aging matter more than the raw alloy number. And remember the starting material: understanding what billet aluminium is<\/a> \u2014 a continuously cast, homogenized extrusion stock \u2014 helps you specify clean, consistent feedstock that forges without seams.<\/p>\n

\"Custom
Custom 7075 forged aluminium part<\/figcaption><\/figure>\n

Draft Angles, Fillets, and Wall Thickness<\/h2>\n

These three parameters decide whether a forging fills the die and releases without cracking.<\/p>\n