Main Types of Thread Rolling Machines for Nails/Screws
. Flat Die Rollers (2-Die Machines)
How they work: The screw blank is rolled between a moving flat die and a stationary flat die (or two moving dies). The dies have a linear profile of the thread.
Characteristics:
Most common for standard wood screws, drywall screws, and self-tapping screws.
Versatile for a wide range of lengths and diameters.
Relatively easier to set up and maintain.
Can handle heads like pan, flat, or washer heads.
2. Cylindrical Die Rollers (Planetary Rollers)
How they work: The screw blank is rotated and rolled between 2-4 cylindrical rotary dies arranged around it (like planets around a sun).
Characteristics:
Extremely high speed (up to 1,000+ pieces per minute).
Excellent for high-volume production of small to medium-sized screws (e.g., electronics screws, machine screws).
Produces very precise threads with excellent concentricity.
Quicker die changeover than flat dies for certain applications.
3. Through-Feed Rollers
How they work: The screw blanks are fed longitudinally between two or three cylindrical dies. They are not held axially, allowing continuous feeding.
Characteristics:
Used for long threaded rods, bolts, and special fasteners.
Less common for typical pointed nails/screws, but used for headless or double-ended products.
Typical Integrated Production Line
Wire Straightening & Feeding: Coiled wire is straightened and fed into the machine.
Upsetting/Forging: A cold header (or nail making machine) forms the head of the screw (e.g., Phillips, hex, etc.).
Thread Rolling: The headed blank is transferred to the thread rolling station.
Pointing (Optional): For screws, the point is often formed before the head in the cold header. For nails, pointing is a separate operation.
Secondary Operations (Optional): Slotting, drilling (for self-drillers), heat treatment, plating/washing.
Key Components of the Machine
Rolling Dies: The heart of the machine. Made from ultra-hard, wear-resistant tool steel (like M2, M42, or powder metallurgy steels). Die design and quality are critical for thread profile, finish, and tool life.
Feed Mechanism: Precisely presents the screw blank to the dies. Can be a vibratory bowl feeder or a pick-and-place mechanism.
Pressure System: Hydraulic or pneumatic system to apply the immense, controlled force needed for cold forming.
Control System: Modern machines use PLCs and touchscreen interfaces for setting parameters like feed rate, rolling pressure, and speed.
Lubrication System: Essential for cooling the dies and workpiece, reducing wear, and ensuring a smooth thread surface.
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