文档介绍：紧固件生产过程(Fastener production process)
The forming method of forging at the top of the bar or wire diameter at room tempe of drawing and necking, so the bolt thread diameter is not necessarily not part. The cold, slightly smaller: the use of necking, and thread diameter or larger.
Bolt material for Aluminum Alloy, zinc alloy, copper alloy, low melting point metal or alloy, the method can also be used in die casting. Do not use steel casting manufacturing.
The forming of the six hexagon head bolts: cold pier, pier, hot upsetting after directly out of the finished product, there are upsetting to machining, are all machining.
The bolt head is forging machining marks, traces in the roots of the mold clamp.
Bolt thread mechanical threading, similar and manual die. A machine system, the large diameter bolt system for car. There are "screw”, with "rolling machine" with z/screw plate" squeeze out the bolt thread, no part is smaller than the diameter of
a thread.
Light bolt (cold forging) and wool (thermal) bolt.
Cold heading is mainly pumping line after their disc element starts rubbing dead, cold room temperature suggests that the screw.
There are also called red hot play, this is a big bolt with only the red ribbon, is the heating of the material again.
The surface of the bolt is pretty cold, red ribbon bolt surface oxide.
The size of the main test screw test,
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