Grinding swords can be divided into "underground research" and "scholar research". "Underground research" is not only to shape and polish the foundation of swords with grindstones; "Scholars' research" is not only the fine grinding of the sword, but also the process of further beautifying the blade. The following introduction of grinding process is based on Honami process. Miao, the ancestor of the Huo Nami family, was born in the Southern and Northern Dynasties in Japan. His family has served the Ashikaga family, Toyotomi family and Tokugawa family for generations, polishing and appraising Japanese knives, among which Ben Ami Guangyue is the most famous.

Hard rock in this field. This is the original stone. The blade that has just been punched out, or the knife with serious corrosion and broken blade, is shaped with this grindstone. 180-220 mesh or so. Prepare water. Used to polish the blade shape, remove deep spots, and generally form grindstones. This is a very important field. About 400-600 mesh. Three kinds of grindstones are used in the process after terrazzo polishing, namely, modified grindstone (900 mesh), middle name grindstone (1200 mesh) and fine name grindstone (1500 mesh). Internal grinding (blade grinding, ground grinding). This kind of grindstone is famous. It is divided into blade grindstone and ground grindstone, which respectively polish the blade and the ground. Natural stones produced near Kyoto. It is an important gem to show the subtle texture changes of the blade and the ground muscles of the knife. About 4000-6000 mesh.

The gentleman went to this step and began to sharpen his knife:

Excellent blade. Press a small piece of Netan with your fingers and grind it on the blade until it feels smooth. Yan Di. Grind about 10-20 pieces with cymbals, cut into small pieces and wipe with your fingers. This shows the subtle changes in the subway.

Wipe it clean. The oxide scale powder appearing in the forging process of the knife is made into a black paste with oil, and it is wiped back and forth on the knife with cotton. Fine powder will penetrate into the blade, and the blade will appear black luster. And the muscles on the ground will become clear.

Take it away with a knife. Cut the grindstone used in the polishing process into round blocks and wipe the edge line. The blade will be exposed. Part of the edge line seen in the photo of the knife is white, which is the function of this process. This process can show the personality and characteristics of the sharpener. The shape of the blade pattern has also been determined. However, this process cannot change the essential shape of the edge pattern, for example, it is impossible to change the straight edge pattern into a chaotic edge. The principle is to keep the shape of the edge pattern as much as possible, and its atmosphere can be properly played (personally, the edge is the finishing touch of polishing spirituality, and it is a taste of "the impact of reason and sensibility", which only everyone can understand).

Grinding. The pickaxe and the peak are polished with a hard polishing rod, showing a mirror luster. ナルメ。