The main equipments include: cold heading machine, thread rolling machine, if you do not buy processed restructuring materials to raw materials, but also need to use hot rolled coil, drawing machine and other equipment and facilities of pickling tank. If you want a high strength, you need annealing furnace, if you are finished delivery, but also need heat treatment furnace, surface treatment equipment, packaging machines and other equipment.
The forming of the six angle head of the bolt can not be generalized. There is a cold pier, a hot pier, and a finished product directly after upsetting. Most of them come out because they can save material. The cold pier or hot pier can be used according to the tonnage and bolt diameter of the pier forging machine. The head of the bolt is machined with traces of the mold at the root.
The six corners of a small batch of special or special bolts are turned and milled. Small batch can be used die threading, thread lathe, milling milling method.
In the mass production, the thread rolling machine, thread rolling machine and thread rolling machine are often used. The efficiency is very high. Because the bolt forming method of drawing and necking, so the bolt thread diameter is not necessarily not part of smaller (wrong upstairs). The cold, slightly smaller; the use of necking, and thread diameter or larger.
There is a machine tool, a large diameter bolt system. There are "screw", with "rolling machine" with "screw plate" squeeze out the bolt thread, no part is smaller than the diameter of a thread. I hope I can help you