There are many applications of nuts, so we can see nuts in many places. The hex rivet nut is usually hexagonal, and the inner hole is an internal thread, which is used to cooperate with the bolt and tighten the related parts. Today we talk about thread rolling of hex rivet nut.
The forming rolling die for thread rolling plastically deforms the workpiece to obtain the self-tapping screw thread. The processing method of self-tapping screw thread rolling is generally performed on a thread rolling machine or an automatic lathe with an automatic opening and closing thread rolling head. It is suitable for the mass production of external threads of standard fasteners and other threaded couplings.
The outer diameter of the rolled thread is generally not more than 25 mm, and the length is not more than 100 mm. The thread accuracy can reach level 2 (GB197-63). The diameter of the blank used is roughly the same as the pitch diameter of the thread being processed. Rolling generally cannot process internal threads, but for softer workpieces, non-slot extrusion taps can be used to cold extrude internal threads (the maximum diameter can reach about 30 mm). The working principle is similar to tapping. When cold-extruding internal threads, the required torque is about twice as large as tapping, and the machining accuracy and surface quality are slightly higher than tapping.
For more details, please visit the half hex rivet nut . www.khfastener.com