Introduction:
Japan's mountain cities are angular and light, which is very suitable for Japanese short stature. Its moves are simple and clear, easy to learn, but sharp and spicy. It emphasizes that one knife will kill, and its length is obviously shorter than that of Taidao. It is like a storm in actual combat, and it is like a ghost. It's hard to prevent. Although it belongs to the same people, it is also an artifact in the army. Japanese soldiers often use short mountain cities to commit suicide when they fail to perform their duties to show their apologies.
History:
As early as the Tang Dynasty in China, China's smelting and forging technology and economy got unprecedented development, and the expensive tangdao was introduced to Japan, which had acquired the smelting skills of han dao. However, when the Japanese Emperor saw tangdao with superior performance and exquisite craftsmanship, he also exclaimed: Only the Central Plains can cast such a beautiful sword. Japanese immediately learned from tangdao's forging method and improved it, becoming one of the world famous knives seen today.
After the Tang Dynasty, China's tangdao forging skills were gradually lost. However, Japanese Dao has a place in the world's cold weapons with its excellent performance and enjoys a good reputation and word of mouth.
Forging:
Shancheng uses flat, broken, complicated and dark-colored blades, which can be divided into edge flowers, belly flowers, small black spots and coarse black spots. Bayonets consist of iron smelting, cutting and quenching.
Iron smelting Japanese use their own steelmaking materials to smelt steel, pig iron, wrought iron and other different varieties in the furnace. The steel thus cast cannot be sharpened directly when sent to the cutting machine, but must be decarburized or carburized in the furnace and cast into strips. Blade-making is to heat the hammered bar steel and fold it repeatedly, so as to precipitate impurities in the raw materials, make the steel symmetrical and then appear patterns.
In the process of smelting and forging, the master observed the temperature with a poker in one hand and pointed out where to hammer with a small hammer in the other. The apprentice hammered hard with a sledgehammer, often swinging the hammer 2000 times a day. This hammering method is often not good, because the carbon content of steel is between pig iron and wrought iron, and it will mature if hammered more iron.
There was no modern testing equipment in ancient times, and whether steel was made or not depended on experience and feeling, so the hammered steel has been reduced to one-third of its original weight. This kind of steel can be used as a blade, but the Japanese want to combine steel and wrought iron into a blade. Because steel is hard, but it is easy to break, it must be supported by soft wrought iron, which is the so-called composite blade. This process is also different from Roman welded steel.
The quenching sword needs to be heated first, because the Japanese blade is made of steel with different properties, so the heating process is extremely complicated, and it is necessary to cover different soils with different textures. This soil application technology presents different modes due to different schools.
At night, the blade caster stares at the burning flame. When the blade reached the required red heat, he quickly pulled out the blade, removed the soil from the blade, and put it into the water to vibrate several times. After quenching, the blade is hardened. The temperature of quenching brine is very particular. After quenching, tempering is needed, that is, the knife is burned on the fire until the water drops rise like beads, and then slowly cooled, which can improve the toughness.
After sharpening the knife and quenching, forging workers use a grindstone to sharpen the edge, and the thickness of the sharp edge is related to the use needs. After the cutting edge is sharpened, it is polished with a special grinder, and then the knife is fitted with a test handle for decoration such as test knife and sheath, which is completed by a special scabbard.