Button head self tapping screws process
Button head self tapping screws process The production of button head self tapping screws has always required a standard process. Don’t look at the size of the screws, but the screwing process must not be underestimated. The screws are small, and the process can be produced quite a lot! Through the screw, the factory sees the screwing process. How is the screw made? In fact, from the process, I believe you will have a clearer understanding. The button head self tapping screws production process mainly includes seven steps of annealing, pickling, drawing, forming, caulking, heat treatment, and surface treatment. Annealing is mainly to heat the wire to a suitable temperature for a certain period of time, and then slowly cool to adjust the crystal, reduce the hardness, and improve the normal temperature processability of the wire. Pickling is designed to remove the oxide film on the surface of the wire and form a phosphate film on the metal surface to reduce ...