How are screws, specifically their heads, manufactured? The shapes of screws are often quite complex depending on the type and head. Is the head just stamped into the screw?
In: 0
The screws start life as carbon steel wire which is straightened/pressed into a specific length/shape, the heads are formed through die pressing to whatever shape (phillips, flathead e.c.t). So essentially the top of the wire is pressed with a die that has the correct shape for the tool.
There is two methods for forming the threads, cylindrical thread forming or reciprocal thread forming. Cylindrical is where the screw is fed into multiple dies and the dies rotate around the wire to form the threads. Reciprocal thread forming uses two flat dies which are passed over the top and bottom of the wire which rotates the actual wire to form the threads.
Latest Answers