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Magazine Article
Think flowforming for precise, accurate, cost-effective parts
2010
Overview
A lesser-known cold-extrusion metal-forming technique, flowforming, makes seamless, near-net, complex, hollow metal parts. The process eliminates welds, which reduces the need for testing, and uses less energy than other manufacturing methods because it wastes less material. Flowforming is similar to metal spinning in that it forms metal against a hardened mandrel. Flowforming entails rotating and compressing the pre-form against the hardened mandrel. Metal is trapped between the mandrel and a set of two, three, or four forming wheels. The gap between the mandrel and wheels determines the finished-part thickness. Because flowforming is conducted at ambient temperatures, many materials \"cold work\" due to strain introduced to the metal during the process. Because the original specification may have been designed based on the starting material's attributes, strain hardening is not necessarily an asset. Fortunately, flowformed parts can be heat treated (fully annealed) to restore the material's original mechanical properties.
Publisher
Endeavor Business Media
