Flat washers are primarily manufactured through high-speed metal stamping, where a press punches the washer shape from a strip of sheet metal. The process involves stamping out the blank, punching the center hole, and applying finishes like zinc plating or galvanizing for corrosion resistance. Common material is stainless steel。Main Production Methods
* Stamping/Punching: This is the most common industrial method. A progressive die stamp creates the inner and outer diameters simultaneously or in successive steps from a metal coil.
* CNC Turning/Milling: Used for custom or specialty washers requiring high precision or for materials that cannot be easily stamped.
Production Steps
1. Material Selection: Choosing the right sheet metal thickness (e.g., steel, aluminum) based on strength requirements.
2. Feeding and Stamping: Metal coils are fed into a stamping press.
3. Blanking and Piercing: A die sets the outer diameter (blanking), while a punch forms the inner hole (piercing).
4. Surface Treatment: Washers are often plated (e.g., zinc) to prevent corrosion.
5. Inspection: Checking dimensions (ID, OD, thickness) and quality to meet standards.
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