Why didn't the Song Dynasty set up a strange knife team?

It has really disappeared completely. Total loss means that all samples and processes are lost. There are three reasons: 1. First of all, because the forging of strange knives takes a long time (folding forging) and consumes a lot of iron (iron can forge two or three ordinary knives and a dozen gun heads), the number of strange knives is not much. In order to ensure the sufficient supply of the army, the Tang government adopted state control over strange knives, which is similar to the national patent of salt and iron, and the people are not allowed to hide it. (In the Song Dynasty, national weapons such as the arm bow were also martial arts, and it was a shame to be punished. ) Even so, Tang Jun only concentrates on rationing elite infantry, and often only two or three rows of mighty warriors in the front row can have powerful knives. 2. Then, because the stranger's knife is not allowed to be buried with him, because being buried with him means losing the stranger's knife forever. Therefore, the Tang Dynasty allowed all kinds of gorgeous knives to be buried with him, but not with him. Obviously, it is difficult for us to dig out objects mainly by digging ancient tombs. 3. The Song Dynasty did not inherit the strange Dao, which led to the complete loss of the strange Dao. The Song Dynasty not only failed to inherit the strange Dao, but also failed to continue to use the powerful horizontal Dao. In the Song Dynasty, it even withdrew from the historical stage. The reason is that the Song Dynasty was basically an infantry against cavalry, taking the route of large forces and assembling cheap and effective weapons. China's cold weapons began a new round of development, and a large number of new spears, long knives, axes and crossbows were born and equipped with Song Jun.