In our lives, countersunk head rivet nut is also a kind of part that we often use. How is the thread of the nut processed?
There are three production processes for countersunk head rivet nut thread processing, cold heading, and hot heading. Under special circumstances, it is also processed organically, which is the slowest inefficiency, and it will be chosen as a last resort. The cold heading specification is usually M3~M30. The wire is selected first. After pickling and cold drawing, connect one end of the wire to the feeding place of the cold heading machine. According to the mold in the cold heading machine, a hexagonal blank of the corresponding size will be produced. There is a hole in the middle, and the form is the same as the general hexagonal nut, but there is no tapping. The old cold heading machine cannot be formed at one time. After the hexagonal blank is punched, it must be poured into the funnel on the tapping machine for tapping. It needs heat treatment and surface treatment, which is to adjust the hardness of the nut and the surface anti-rust treatment. The current cold heading machine has a one-time molding, but the principle is not much different. It is more efficient to integrate the tapping machine and the cold heading machine. Faster, the cold heading is the fastest and lowest cost production process.
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