Process for tungsten rectangular bar or square bar: 1. Forging the blank to suitable size, drawing a bit to closed size, also annealing and mold are engaged. 2.Remove the oxide and grinding the surface. The grinding surface is more difficult since it is need to be done face by face, normally the end face is turning instead grinding, it the side face is too small, it will also be turning only. The other way to produce tungsten bar is cut form tungsten plate, next article we will talk about process for rolling tungsten products. The method depends on the specific dimensions of tungsten bar. If it is thin and narrow, it will be from tungsten plate.
If the tungsten complex parts are made from bar, and rod and other machining processes such as: laser cut, water jet cut, drilling, turning, wire cutting, etc. will be chosen according to drawing and process technology.
As tungsten is fragile, the process & machine selection is very important. It might be crack in the process seriously, or not able to reach the tolerance. The raw material and annealing process counts a lot too.
