GRINDING METHOD OF METAL MATERIAL AND GRINDING DEVICE OF METAL MATERIAL

PROBLEM TO BE SOLVED: To provide a grinding method of a metal material and a grinding device of the metal material, enabling the replacement life of a grindstone to be more easily prolonged.SOLUTION: The grinding method of the metal material for grinding the metal material by using the grindstone is provided in which at least any one of oxygen gas, an oxygen molecule and an electron or an oxygen anion is supplied to a grinding region of the metal material to be ground by the grindstone. In this case, the oxygen gas is supplied in such a manner that a volume fraction of oxygen in the grinding region becomes more than a volume fraction of the oxygen in the atmosphere. Thus, grinding can be performed by electrolytic action by oxidation reaction in addition to grinding by mechanical shear force by the grindstone, and a cutting time of the metal material can be largely shortened. As a result, the grindstone life can be prolonged.