To provide a paste material capable of carrying mirror finishing at high grade even on a member hard to be subjected to surface processing such as soft metal material, and efficiently carrying out work of surface processing by minute cutting action.
A magnetic polishing liquid 4 includes metal particles having magnetism, a solvent, and a low welting point resin. The solvent is vegetable oil and fat, and the low melting point resin is formed from resin material insoluble in the solvent and has a low melting point. The magnetic metal particles is a non-spherical shape with a sharp angle portion. A diameter of the particle is made to be 10 m to 300 m, and saturated magnetization when volume magnetization is 4M is made to be not less than 15kG. When a magnetic field of a permanent magnet 20 effects, the magnetic metal particles attract each other to generate a magnetic cluster. The magnetic metal particles also function as abrasive grains, and the magnetic cluster becomes a magnetic brush carrying minute shaving. The magnetic metal particles which are the abrasive grains is prevented from remaining in the magnetic brush and permeating out due to the effect of the magnetic field.
NAKAMURA TERUHISA
HASHIMOTO TOSHITAKA
MATSUO YOSHIO
YAMAMOTO KEITA
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