What is the manufacturing process of screws?

I. Production technology \x0d\ Coil annealing, pickling, wire drawing, gear rolling, heat treatment, electroplating and packaging \ x0d \ (1) Coil: \x0d\ 1. Coil refers to the original wire rod purchased from the manufacturer. A coil mainly includes the following parameters: \ x0d \ A brand B, product name C, specification D, material \x0d\ E, heat number or batch number F, quantity/weight \x0d\ 2. The main chemical components in steel are C, Mn, P, S, Si, Cu and al, and the lower the Al and Cu content, the better. \x0d\ (2) Annealing: eliminating internal stress in wire processing and increasing its malleability. \x0d\ (3), pickling: remove an oxide film on the surface of the wire, and at the same time lubricate the surface of the wire to facilitate wire drawing. \x0d\ hydrochloric acid washing, grass washing (60-80℃), phosphate washing lubricant \x0d\ (4), wire drawing: in order to achieve the wire diameter we need. \x0d\ pickling line diagram \x0d\ disc element \x0d\ annealing pickling line diagram \x0d\ (5), upsetting (forming) and hobbing: finish machining the product shape and shaping the tooth profile. \x0d\ (6), heat treatment: change the mechanical properties of the screw. \x0d\ (7)。 Electroplating: Surface treatment to meet the requirements of customers, and at the same time, it can improve some properties of screws. Such as rust prevention, beauty and so on. \x0d\ (8) Packaging: The products are packed in boxes/boxes according to standards or customer requirements. \ x0d \ x0d \ There are tens of thousands of kinds of screws, and there are many non-standard parts. You can query the specifications and grades online according to specific needs, or you can directly query the China screws online.