There are many types of rivet nuts that can be seen around us, and blind rivet nut is also one of the rivet nuts we can see in our daily lives. So how are the threads of rivet nuts processed?
The first is annealing, the wire is heated to an appropriate temperature, kept for a certain period, and then slowly cooled to adjust the crystal structure, reduce the hardness, and improve the wire processability at room temperature.
Then pickling to remove the oxide film on the wire surface, and form a layer of phosphate film on the metal surface to reduce the wire drawing and cold forging or forming and other processing processes, the scratches to the mold.
Then draw the wire and cold pull the plate element to the required wire diameter. In practice, some products can be divided into two stages: rough extraction (peeling) and fine extraction. Forming, cold forging (or hot forging) of the wire to achieve the shape and length (or thickness) of the semi-finished product.
Thread rolling, rolling, or tapping the formed semi-finished product to achieve the required thread. In practice, bolts (screws) are called thread rolling, threaded rods are called thread rolling, and nuts are called tapping.
Finally, it undergoes heat treatment and surface treatment. Of course, the same is true of countersunk head rivet nut .