1. Classification of commonly used nut cold heading processes
Hexagonal nuts are also widely used fasteners, and there are many production methods for them. Nuts with specifications below M24 are generally produced using cold heading (pressing) method. The commonly used cold heading processes for nuts include the following:
a. Producing nuts by cold heading with wire of smaller diameter
This is the most commonly used production method for cold heading nuts. Use wire diameter do=0.60s~0.70s, s - the size of the nut on the other side. The workstations (processes) for cutting, shaping, upsetting, pressing hexagonal, and punching are shown in Figure 36-23. Production can be carried out on three station and four station automatic cold heading machines, or in sequence on a press machine. Production on a three station cold heading machine can eliminate the need for shaping, but for nuts larger than M12, without shaping, it is difficult to control the quality of the end face and the uniformity of the bald angle.
b. Producing nuts by cold heading with larger diameter wire rods
This process uses wire with a diameter of do ≈ 0.9s, which is cut, shaped, initially upset, pre formed, precision formed, and punched. It is generally produced on a five station automatic cold heading machine with a clamp and flipping mechanism, as shown in Figure 36-24.
c. Hexagonal steel forming process
This process method is rarely used and is generally used for the production of M20 and above large-sized nuts. It is completed using a sequential cold pressing method on a press machine. The production process involves cutting, initial pressing, precision pressing, and punching.
2026 August 1st Week WBM Product Recommendation
Spherical Roller:
Spherical roller bearings have two rows of symmetrical rollers, a common sphere outer ring raceway and two inner ring raceways inclined at an angle to the bearing axis. The centre point of the sphere in the outer ring raceway is at the bearing axis.
https://www.bearingroller.com/rolling-elements/taper-roller/spherical-2roller.html
