As a common fastener, nail forming has evolved over a long period of time into a mature manufacturing process. Nail production relies heavily on metalworking techniques, with key steps including material selection, heating and forming, cooling, and surface finishing.
Nails are typically made from metals such as mild steel, stainless steel, or copper. Mild steel is the most commonly used raw material due to its excellent ductility and cost advantages. Before production, the metal undergoes pre-processing, such as melting and rolling, to produce wire with a diameter matching the nail.
Key steps in the forming process are cold heading or hot heading. Cold heading involves applying high pressure to the wire at room temperature through a die, causing it to plastically deform into the shape of the nail head. This process is highly efficient and suitable for large-scale production, but it places stringent demands on die precision. For higher-hardness materials, hot heading is used, where the metal is heated to a plastic state before being stamped to ensure a perfect nail head shape.
The shank of a nail is typically formed through a drawing process, where a metal wire is stretched through a progressively smaller die to the desired diameter. The tip is then punched or cut to create a sharp point for easier penetration.
After forming, the nail undergoes heat treatment to enhance its strength and toughness. Common treatments include quenching and tempering, which optimize the metal's internal structure by controlling the heating temperature and cooling rate. Finally, the nail surface may receive rust-proofing treatments such as galvanizing and phosphating, or, if desired, finishing treatments such as polishing or coating.
The nail forming process integrates materials science, machining, and surface treatment technologies, and its optimization directly impacts the nail's performance and service life. Advances in manufacturing have further improved the efficiency and quality of nail production through the application of automation and precision mold technology.