The large arm die forgings are generally small in batch, and the cost of making large molds is too high.

Forging with a die requires too large a press. Even if there is a huge die, there is no such a large press. At present, the domestic large-tonnage hydraulic press seems to be only 50000 tons. The largest forging hammer in China is only 16 tons, and the equipment standard for forging large forgings is too low

If the giant arm die forgings are forged by die forging, the equipment used is very large. However, the gradual deformation of the blank can be achieved by using the free forging method without the restriction of the equipment capacity.

There is also a method of die forging with a splint hammer, which has a lower precision. Therefore, generally large forgings are free forging.